Merge branch 'for-next-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending into vhost-net-next

drivers/infiniband/Kconfig

···
 source "drivers/infiniband/ulp/srpt/Kconfig"
 
 source "drivers/infiniband/ulp/iser/Kconfig"
+source "drivers/infiniband/ulp/isert/Kconfig"
 
 endif # INFINIBAND

drivers/infiniband/Makefile

···
 obj-$(CONFIG_INFINIBAND_SRP)		+= ulp/srp/
 obj-$(CONFIG_INFINIBAND_SRPT)		+= ulp/srpt/
 obj-$(CONFIG_INFINIBAND_ISER)		+= ulp/iser/
+obj-$(CONFIG_INFINIBAND_ISERT)		+= ulp/isert/

drivers/infiniband/ulp/isert/Kconfig

···
+config INFINIBAND_ISERT
+	tristate "iSCSI Extentions for RDMA (iSER) target support"
+	depends on INET && INFINIBAND_ADDR_TRANS && TARGET_CORE && ISCSI_TARGET
+	---help---
+	Support for iSCSI Extentions for RDMA (iSER) Target on Infiniband fabrics.

drivers/infiniband/ulp/isert/Makefile

···
+ccflags-y		:= -Idrivers/target -Idrivers/target/iscsi
+obj-$(CONFIG_INFINIBAND_ISERT)	+= ib_isert.o

drivers/infiniband/ulp/isert/ib_isert.c

···
+/*******************************************************************************
+ * This file contains iSCSI extentions for RDMA (iSER) Verbs
+ *
+ * (c) Copyright 2013 RisingTide Systems LLC.
+ *
+ * Nicholas A. Bellinger <[e-mail]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ ****************************************************************************/
+
+#include <linux/string.h>
+#include <linux/module.h>
+#include <linux/scatterlist.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <rdma/ib_verbs.h>
+#include <rdma/rdma_cm.h>
+#include <target/target_core_base.h>
+#include <target/target_core_fabric.h>
+#include <target/iscsi/iscsi_transport.h>
+
+#include "isert_proto.h"
+#include "ib_isert.h"
+
+#define	ISERT_MAX_CONN		8
+#define ISER_MAX_RX_CQ_LEN	(ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
+#define ISER_MAX_TX_CQ_LEN	(ISERT_QP_MAX_REQ_DTOS  * ISERT_MAX_CONN)
+
+static DEFINE_MUTEX(device_list_mutex);
+static LIST_HEAD(device_list);
+static struct workqueue_struct *isert_rx_wq;
+static struct workqueue_struct *isert_comp_wq;
+static struct kmem_cache *isert_cmd_cache;
+
+static void
+isert_qp_event_callback(struct ib_event *e, void *context)
+{
+	struct isert_conn *isert_conn = (struct isert_conn *)context;
+
+	pr_err("isert_qp_event_callback event: %d\n", e->event);
+	switch (e->event) {
+	case IB_EVENT_COMM_EST:
+		rdma_notify(isert_conn->conn_cm_id, IB_EVENT_COMM_EST);
+		break;
+	case IB_EVENT_QP_LAST_WQE_REACHED:
+		pr_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED:\n");
+		break;
+	default:
+		break;
+	}
+}
+
+static int
+isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
+{
+	int ret;
+
+	ret = ib_query_device(ib_dev, devattr);
+	if (ret) {
+		pr_err("ib_query_device() failed: %d\n", ret);
+		return ret;
+	}
+	pr_debug("devattr->max_sge: %d\n", devattr->max_sge);
+	pr_debug("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);
+
+	return 0;
+}
+
+static int
+isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
+{
+	struct isert_device *device = isert_conn->conn_device;
+	struct ib_qp_init_attr attr;
+	struct ib_device_attr devattr;
+	int ret, index, min_index = 0;
+
+	memset(&devattr, 0, sizeof(struct ib_device_attr));
+	ret = isert_query_device(cma_id->device, &devattr);
+	if (ret)
+		return ret;
+
+	mutex_lock(&device_list_mutex);
+	for (index = 0; index < device->cqs_used; index++)
+		if (device->cq_active_qps[index] <
+		    device->cq_active_qps[min_index])
+			min_index = index;
+	device->cq_active_qps[min_index]++;
+	pr_debug("isert_conn_setup_qp: Using min_index: %d\n", min_index);
+	mutex_unlock(&device_list_mutex);
+
+	memset(&attr, 0, sizeof(struct ib_qp_init_attr));
+	attr.event_handler = isert_qp_event_callback;
+	attr.qp_context = isert_conn;
+	attr.send_cq = device->dev_tx_cq[min_index];
+	attr.recv_cq = device->dev_rx_cq[min_index];
+	attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
+	attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS;
+	/*
+	 * FIXME: Use devattr.max_sge - 2 for max_send_sge as
+	 * work-around for RDMA_READ..
+	 */
+	attr.cap.max_send_sge = devattr.max_sge - 2;
+	isert_conn->max_sge = attr.cap.max_send_sge;
+
+	attr.cap.max_recv_sge = 1;
+	attr.sq_sig_type = IB_SIGNAL_REQ_WR;
+	attr.qp_type = IB_QPT_RC;
+
+	pr_debug("isert_conn_setup_qp cma_id->device: %p\n",
+		 cma_id->device);
+	pr_debug("isert_conn_setup_qp conn_pd->device: %p\n",
+		 isert_conn->conn_pd->device);
+
+	ret = rdma_create_qp(cma_id, isert_conn->conn_pd, &attr);
+	if (ret) {
+		pr_err("rdma_create_qp failed for cma_id %d\n", ret);
+		return ret;
+	}
+	isert_conn->conn_qp = cma_id->qp;
+	pr_debug("rdma_create_qp() returned success >>>>>>>>>>>>>>>>>>>>>>>>>.\n");
+
+	return 0;
+}
+
+static void
+isert_cq_event_callback(struct ib_event *e, void *context)
+{
+	pr_debug("isert_cq_event_callback event: %d\n", e->event);
+}
+
+static int
+isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
+{
+	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+	struct iser_rx_desc *rx_desc;
+	struct ib_sge *rx_sg;
+	u64 dma_addr;
+	int i, j;
+
+	isert_conn->conn_rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
+				sizeof(struct iser_rx_desc), GFP_KERNEL);
+	if (!isert_conn->conn_rx_descs)
+		goto fail;
+
+	rx_desc = isert_conn->conn_rx_descs;
+
+	for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
+		dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
+					ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
+		if (ib_dma_mapping_error(ib_dev, dma_addr))
+			goto dma_map_fail;
+
+		rx_desc->dma_addr = dma_addr;
+
+		rx_sg = &rx_desc->rx_sg;
+		rx_sg->addr = rx_desc->dma_addr;
+		rx_sg->length = ISER_RX_PAYLOAD_SIZE;
+		rx_sg->lkey = isert_conn->conn_mr->lkey;
+	}
+
+	isert_conn->conn_rx_desc_head = 0;
+	return 0;
+
+dma_map_fail:
+	rx_desc = isert_conn->conn_rx_descs;
+	for (j = 0; j < i; j++, rx_desc++) {
+		ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
+				    ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
+	}
+	kfree(isert_conn->conn_rx_descs);
+	isert_conn->conn_rx_descs = NULL;
+fail:
+	return -ENOMEM;
+}
+
+static void
+isert_free_rx_descriptors(struct isert_conn *isert_conn)
+{
+	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+	struct iser_rx_desc *rx_desc;
+	int i;
+
+	if (!isert_conn->conn_rx_descs)
+		return;
+
+	rx_desc = isert_conn->conn_rx_descs;
+	for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++)  {
+		ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
+				    ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
+	}
+
+	kfree(isert_conn->conn_rx_descs);
+	isert_conn->conn_rx_descs = NULL;
+}
+
+static void isert_cq_tx_callback(struct ib_cq *, void *);
+static void isert_cq_rx_callback(struct ib_cq *, void *);
+
+static int
+isert_create_device_ib_res(struct isert_device *device)
+{
+	struct ib_device *ib_dev = device->ib_device;
+	struct isert_cq_desc *cq_desc;
+	int ret = 0, i, j;
+
+	device->cqs_used = min_t(int, num_online_cpus(),
+				 device->ib_device->num_comp_vectors);
+	device->cqs_used = min(ISERT_MAX_CQ, device->cqs_used);
+	pr_debug("Using %d CQs, device %s supports %d vectors\n",
+		 device->cqs_used, device->ib_device->name,
+		 device->ib_device->num_comp_vectors);
+	device->cq_desc = kzalloc(sizeof(struct isert_cq_desc) *
+				device->cqs_used, GFP_KERNEL);
+	if (!device->cq_desc) {
+		pr_err("Unable to allocate device->cq_desc\n");
+		return -ENOMEM;
+	}
+	cq_desc = device->cq_desc;
+
+	device->dev_pd = ib_alloc_pd(ib_dev);
+	if (IS_ERR(device->dev_pd)) {
+		ret = PTR_ERR(device->dev_pd);
+		pr_err("ib_alloc_pd failed for dev_pd: %d\n", ret);
+		goto out_cq_desc;
+	}
+
+	for (i = 0; i < device->cqs_used; i++) {
+		cq_desc[i].device = device;
+		cq_desc[i].cq_index = i;
+
+		device->dev_rx_cq[i] = ib_create_cq(device->ib_device,
+						isert_cq_rx_callback,
+						isert_cq_event_callback,
+						(void *)&cq_desc[i],
+						ISER_MAX_RX_CQ_LEN, i);
+		if (IS_ERR(device->dev_rx_cq[i]))
+			goto out_cq;
+
+		device->dev_tx_cq[i] = ib_create_cq(device->ib_device,
+						isert_cq_tx_callback,
+						isert_cq_event_callback,
+						(void *)&cq_desc[i],
+						ISER_MAX_TX_CQ_LEN, i);
+		if (IS_ERR(device->dev_tx_cq[i]))
+			goto out_cq;
+
+		if (ib_req_notify_cq(device->dev_rx_cq[i], IB_CQ_NEXT_COMP))
+			goto out_cq;
+
+		if (ib_req_notify_cq(device->dev_tx_cq[i], IB_CQ_NEXT_COMP))
+			goto out_cq;
+	}
+
+	device->dev_mr = ib_get_dma_mr(device->dev_pd, IB_ACCESS_LOCAL_WRITE);
+	if (IS_ERR(device->dev_mr)) {
+		ret = PTR_ERR(device->dev_mr);
+		pr_err("ib_get_dma_mr failed for dev_mr: %d\n", ret);
+		goto out_cq;
+	}
+
+	return 0;
+
+out_cq:
+	for (j = 0; j < i; j++) {
+		cq_desc = &device->cq_desc[j];
+
+		if (device->dev_rx_cq[j]) {
+			cancel_work_sync(&cq_desc->cq_rx_work);
+			ib_destroy_cq(device->dev_rx_cq[j]);
+		}
+		if (device->dev_tx_cq[j]) {
+			cancel_work_sync(&cq_desc->cq_tx_work);
+			ib_destroy_cq(device->dev_tx_cq[j]);
+		}
+	}
+	ib_dealloc_pd(device->dev_pd);
+
+out_cq_desc:
+	kfree(device->cq_desc);
+
+	return ret;
+}
+
+static void
+isert_free_device_ib_res(struct isert_device *device)
+{
+	struct isert_cq_desc *cq_desc;
+	int i;
+
+	for (i = 0; i < device->cqs_used; i++) {
+		cq_desc = &device->cq_desc[i];
+
+		cancel_work_sync(&cq_desc->cq_rx_work);
+		cancel_work_sync(&cq_desc->cq_tx_work);
+		ib_destroy_cq(device->dev_rx_cq[i]);
+		ib_destroy_cq(device->dev_tx_cq[i]);
+		device->dev_rx_cq[i] = NULL;
+		device->dev_tx_cq[i] = NULL;
+	}
+
+	ib_dereg_mr(device->dev_mr);
+	ib_dealloc_pd(device->dev_pd);
+	kfree(device->cq_desc);
+}
+
+static void
+isert_device_try_release(struct isert_device *device)
+{
+	mutex_lock(&device_list_mutex);
+	device->refcount--;
+	if (!device->refcount) {
+		isert_free_device_ib_res(device);
+		list_del(&device->dev_node);
+		kfree(device);
+	}
+	mutex_unlock(&device_list_mutex);
+}
+
+static struct isert_device *
+isert_device_find_by_ib_dev(struct rdma_cm_id *cma_id)
+{
+	struct isert_device *device;
+	int ret;
+
+	mutex_lock(&device_list_mutex);
+	list_for_each_entry(device, &device_list, dev_node) {
+		if (device->ib_device->node_guid == cma_id->device->node_guid) {
+			device->refcount++;
+			mutex_unlock(&device_list_mutex);
+			return device;
+		}
+	}
+
+	device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
+	if (!device) {
+		mutex_unlock(&device_list_mutex);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	INIT_LIST_HEAD(&device->dev_node);
+
+	device->ib_device = cma_id->device;
+	ret = isert_create_device_ib_res(device);
+	if (ret) {
+		kfree(device);
+		mutex_unlock(&device_list_mutex);
+		return ERR_PTR(ret);
+	}
+
+	device->refcount++;
+	list_add_tail(&device->dev_node, &device_list);
+	mutex_unlock(&device_list_mutex);
+
+	return device;
+}
+
+static int
+isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
+{
+	struct iscsi_np *np = cma_id->context;
+	struct isert_np *isert_np = np->np_context;
+	struct isert_conn *isert_conn;
+	struct isert_device *device;
+	struct ib_device *ib_dev = cma_id->device;
+	int ret = 0;
+
+	pr_debug("Entering isert_connect_request cma_id: %p, context: %p\n",
+		 cma_id, cma_id->context);
+
+	isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
+	if (!isert_conn) {
+		pr_err("Unable to allocate isert_conn\n");
+		return -ENOMEM;
+	}
+	isert_conn->state = ISER_CONN_INIT;
+	INIT_LIST_HEAD(&isert_conn->conn_accept_node);
+	init_completion(&isert_conn->conn_login_comp);
+	init_waitqueue_head(&isert_conn->conn_wait);
+	init_waitqueue_head(&isert_conn->conn_wait_comp_err);
+	kref_init(&isert_conn->conn_kref);
+	kref_get(&isert_conn->conn_kref);
+
+	cma_id->context = isert_conn;
+	isert_conn->conn_cm_id = cma_id;
+	isert_conn->responder_resources = event->param.conn.responder_resources;
+	isert_conn->initiator_depth = event->param.conn.initiator_depth;
+	pr_debug("Using responder_resources: %u initiator_depth: %u\n",
+		 isert_conn->responder_resources, isert_conn->initiator_depth);
+
+	isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
+					ISER_RX_LOGIN_SIZE, GFP_KERNEL);
+	if (!isert_conn->login_buf) {
+		pr_err("Unable to allocate isert_conn->login_buf\n");
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	isert_conn->login_req_buf = isert_conn->login_buf;
+	isert_conn->login_rsp_buf = isert_conn->login_buf +
+				    ISCSI_DEF_MAX_RECV_SEG_LEN;
+	pr_debug("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
+		 isert_conn->login_buf, isert_conn->login_req_buf,
+		 isert_conn->login_rsp_buf);
+
+	isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
+				(void *)isert_conn->login_req_buf,
+				ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
+
+	ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
+	if (ret) {
+		pr_err("ib_dma_mapping_error failed for login_req_dma: %d\n",
+		       ret);
+		isert_conn->login_req_dma = 0;
+		goto out_login_buf;
+	}
+
+	isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
+					(void *)isert_conn->login_rsp_buf,
+					ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
+
+	ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
+	if (ret) {
+		pr_err("ib_dma_mapping_error failed for login_rsp_dma: %d\n",
+		       ret);
+		isert_conn->login_rsp_dma = 0;
+		goto out_req_dma_map;
+	}
+
+	device = isert_device_find_by_ib_dev(cma_id);
+	if (IS_ERR(device)) {
+		ret = PTR_ERR(device);
+		goto out_rsp_dma_map;
+	}
+
+	isert_conn->conn_device = device;
+	isert_conn->conn_pd = device->dev_pd;
+	isert_conn->conn_mr = device->dev_mr;
+
+	ret = isert_conn_setup_qp(isert_conn, cma_id);
+	if (ret)
+		goto out_conn_dev;
+
+	mutex_lock(&isert_np->np_accept_mutex);
+	list_add_tail(&isert_np->np_accept_list, &isert_conn->conn_accept_node);
+	mutex_unlock(&isert_np->np_accept_mutex);
+
+	pr_debug("isert_connect_request() waking up np_accept_wq: %p\n", np);
+	wake_up(&isert_np->np_accept_wq);
+	return 0;
+
+out_conn_dev:
+	isert_device_try_release(device);
+out_rsp_dma_map:
+	ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
+			    ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
+out_req_dma_map:
+	ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
+			    ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
+out_login_buf:
+	kfree(isert_conn->login_buf);
+out:
+	kfree(isert_conn);
+	return ret;
+}
+
+static void
+isert_connect_release(struct isert_conn *isert_conn)
+{
+	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+	struct isert_device *device = isert_conn->conn_device;
+	int cq_index;
+
+	pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
+
+	if (isert_conn->conn_qp) {
+		cq_index = ((struct isert_cq_desc *)
+			isert_conn->conn_qp->recv_cq->cq_context)->cq_index;
+		pr_debug("isert_connect_release: cq_index: %d\n", cq_index);
+		isert_conn->conn_device->cq_active_qps[cq_index]--;
+
+		rdma_destroy_qp(isert_conn->conn_cm_id);
+	}
+
+	isert_free_rx_descriptors(isert_conn);
+	rdma_destroy_id(isert_conn->conn_cm_id);
+
+	if (isert_conn->login_buf) {
+		ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
+				    ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
+		ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
+				    ISCSI_DEF_MAX_RECV_SEG_LEN,
+				    DMA_FROM_DEVICE);
+		kfree(isert_conn->login_buf);
+	}
+	kfree(isert_conn);
+
+	if (device)
+		isert_device_try_release(device);
+
+	pr_debug("Leaving isert_connect_release >>>>>>>>>>>>\n");
+}
+
+static void
+isert_connected_handler(struct rdma_cm_id *cma_id)
+{
+	return;
+}
+
+static void
+isert_release_conn_kref(struct kref *kref)
+{
+	struct isert_conn *isert_conn = container_of(kref,
+				struct isert_conn, conn_kref);
+
+	pr_debug("Calling isert_connect_release for final kref %s/%d\n",
+		 current->comm, current->pid);
+
+	isert_connect_release(isert_conn);
+}
+
+static void
+isert_put_conn(struct isert_conn *isert_conn)
+{
+	kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
+}
+
+static void
+isert_disconnect_work(struct work_struct *work)
+{
+	struct isert_conn *isert_conn = container_of(work,
+				struct isert_conn, conn_logout_work);
+
+	pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
+
+	isert_conn->state = ISER_CONN_DOWN;
+
+	if (isert_conn->post_recv_buf_count == 0 &&
+	    atomic_read(&isert_conn->post_send_buf_count) == 0) {
+		pr_debug("Calling wake_up(&isert_conn->conn_wait);\n");
+		wake_up(&isert_conn->conn_wait);
+	}
+
+	isert_put_conn(isert_conn);
+}
+
+static void
+isert_disconnected_handler(struct rdma_cm_id *cma_id)
+{
+	struct isert_conn *isert_conn = (struct isert_conn *)cma_id->context;
+
+	INIT_WORK(&isert_conn->conn_logout_work, isert_disconnect_work);
+	schedule_work(&isert_conn->conn_logout_work);
+}
+
+static int
+isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
+{
+	int ret = 0;
+
+	pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n",
+		 event->event, event->status, cma_id->context, cma_id);
+
+	switch (event->event) {
+	case RDMA_CM_EVENT_CONNECT_REQUEST:
+		pr_debug("RDMA_CM_EVENT_CONNECT_REQUEST: >>>>>>>>>>>>>>>\n");
+		ret = isert_connect_request(cma_id, event);
+		break;
+	case RDMA_CM_EVENT_ESTABLISHED:
+		pr_debug("RDMA_CM_EVENT_ESTABLISHED >>>>>>>>>>>>>>\n");
+		isert_connected_handler(cma_id);
+		break;
+	case RDMA_CM_EVENT_DISCONNECTED:
+		pr_debug("RDMA_CM_EVENT_DISCONNECTED: >>>>>>>>>>>>>>\n");
+		isert_disconnected_handler(cma_id);
+		break;
+	case RDMA_CM_EVENT_DEVICE_REMOVAL:
+	case RDMA_CM_EVENT_ADDR_CHANGE:
+		break;
+	case RDMA_CM_EVENT_CONNECT_ERROR:
+	default:
+		pr_err("Unknown RDMA CMA event: %d\n", event->event);
+		break;
+	}
+
+	if (ret != 0) {
+		pr_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n",
+		       event->event, ret);
+		dump_stack();
+	}
+
+	return ret;
+}
+
+static int
+isert_post_recv(struct isert_conn *isert_conn, u32 count)
+{
+	struct ib_recv_wr *rx_wr, *rx_wr_failed;
+	int i, ret;
+	unsigned int rx_head = isert_conn->conn_rx_desc_head;
+	struct iser_rx_desc *rx_desc;
+
+	for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) {
+		rx_desc		= &isert_conn->conn_rx_descs[rx_head];
+		rx_wr->wr_id	= (unsigned long)rx_desc;
+		rx_wr->sg_list	= &rx_desc->rx_sg;
+		rx_wr->num_sge	= 1;
+		rx_wr->next	= rx_wr + 1;
+		rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
+	}
+
+	rx_wr--;
+	rx_wr->next = NULL; /* mark end of work requests list */
+
+	isert_conn->post_recv_buf_count += count;
+	ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr,
+				&rx_wr_failed);
+	if (ret) {
+		pr_err("ib_post_recv() failed with ret: %d\n", ret);
+		isert_conn->post_recv_buf_count -= count;
+	} else {
+		pr_debug("isert_post_recv(): Posted %d RX buffers\n", count);
+		isert_conn->conn_rx_desc_head = rx_head;
+	}
+	return ret;
+}
+
+static int
+isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
+{
+	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+	struct ib_send_wr send_wr, *send_wr_failed;
+	int ret;
+
+	ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
+				      ISER_HEADERS_LEN, DMA_TO_DEVICE);
+
+	send_wr.next	= NULL;
+	send_wr.wr_id	= (unsigned long)tx_desc;
+	send_wr.sg_list	= tx_desc->tx_sg;
+	send_wr.num_sge	= tx_desc->num_sge;
+	send_wr.opcode	= IB_WR_SEND;
+	send_wr.send_flags = IB_SEND_SIGNALED;
+
+	atomic_inc(&isert_conn->post_send_buf_count);
+
+	ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed);
+	if (ret) {
+		pr_err("ib_post_send() failed, ret: %d\n", ret);
+		atomic_dec(&isert_conn->post_send_buf_count);
+	}
+
+	return ret;
+}
+
+static void
+isert_create_send_desc(struct isert_conn *isert_conn,
+		       struct isert_cmd *isert_cmd,
+		       struct iser_tx_desc *tx_desc)
+{
+	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+
+	ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
+				   ISER_HEADERS_LEN, DMA_TO_DEVICE);
+
+	memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
+	tx_desc->iser_header.flags = ISER_VER;
+
+	tx_desc->num_sge = 1;
+	tx_desc->isert_cmd = isert_cmd;
+
+	if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) {
+		tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
+		pr_debug("tx_desc %p lkey mismatch, fixing\n", tx_desc);
+	}
+}
+
+static int
+isert_init_tx_hdrs(struct isert_conn *isert_conn,
+		   struct iser_tx_desc *tx_desc)
+{
+	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+	u64 dma_addr;
+
+	dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
+			ISER_HEADERS_LEN, DMA_TO_DEVICE);
+	if (ib_dma_mapping_error(ib_dev, dma_addr)) {
+		pr_err("ib_dma_mapping_error() failed\n");
+		return -ENOMEM;
+	}
+
+	tx_desc->dma_addr = dma_addr;
+	tx_desc->tx_sg[0].addr	= tx_desc->dma_addr;
+	tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
+	tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
+
+	pr_debug("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u"
+		 " lkey: 0x%08x\n", tx_desc->tx_sg[0].addr,
+		 tx_desc->tx_sg[0].length, tx_desc->tx_sg[0].lkey);
+
+	return 0;
+}
+
+static void
+isert_init_send_wr(struct isert_cmd *isert_cmd, struct ib_send_wr *send_wr)
+{
+	isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
+	send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
+	send_wr->opcode = IB_WR_SEND;
+	send_wr->send_flags = IB_SEND_SIGNALED;
+	send_wr->sg_list = &isert_cmd->tx_desc.tx_sg[0];
+	send_wr->num_sge = isert_cmd->tx_desc.num_sge;
+}
+
+static int
+isert_rdma_post_recvl(struct isert_conn *isert_conn)
+{
+	struct ib_recv_wr rx_wr, *rx_wr_fail;
+	struct ib_sge sge;
+	int ret;
+
+	memset(&sge, 0, sizeof(struct ib_sge));
+	sge.addr = isert_conn->login_req_dma;
+	sge.length = ISER_RX_LOGIN_SIZE;
+	sge.lkey = isert_conn->conn_mr->lkey;
+
+	pr_debug("Setup sge: addr: %llx length: %d 0x%08x\n",
+		sge.addr, sge.length, sge.lkey);
+
+	memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
+	rx_wr.wr_id = (unsigned long)isert_conn->login_req_buf;
+	rx_wr.sg_list = &sge;
+	rx_wr.num_sge = 1;
+
+	isert_conn->post_recv_buf_count++;
+	ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail);
+	if (ret) {
+		pr_err("ib_post_recv() failed: %d\n", ret);
+		isert_conn->post_recv_buf_count--;
+	}
+
+	pr_debug("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n");
+	return ret;
+}
+
+static int
+isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
+		   u32 length)
+{
+	struct isert_conn *isert_conn = conn->context;
+	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+	struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc;
+	int ret;
+
+	isert_create_send_desc(isert_conn, NULL, tx_desc);
+
+	memcpy(&tx_desc->iscsi_header, &login->rsp[0],
+	       sizeof(struct iscsi_hdr));
+
+	isert_init_tx_hdrs(isert_conn, tx_desc);
+
+	if (length > 0) {
+		struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
+
+		ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
+					   length, DMA_TO_DEVICE);
+
+		memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
+
+		ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
+					      length, DMA_TO_DEVICE);
+
+		tx_dsg->addr	= isert_conn->login_rsp_dma;
+		tx_dsg->length	= length;
+		tx_dsg->lkey	= isert_conn->conn_mr->lkey;
+		tx_desc->num_sge = 2;
+	}
+	if (!login->login_failed) {
+		if (login->login_complete) {
+			ret = isert_alloc_rx_descriptors(isert_conn);
+			if (ret)
+				return ret;
+
+			ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
+			if (ret)
+				return ret;
+
+			isert_conn->state = ISER_CONN_UP;
+			goto post_send;
+		}
+
+		ret = isert_rdma_post_recvl(isert_conn);
+		if (ret)
+			return ret;
+	}
+post_send:
+	ret = isert_post_send(isert_conn, tx_desc);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static void
+isert_rx_login_req(struct iser_rx_desc *rx_desc, int rx_buflen,
+		   struct isert_conn *isert_conn)
+{
+	struct iscsi_conn *conn = isert_conn->conn;
+	struct iscsi_login *login = conn->conn_login;
+	int size;
+
+	if (!login) {
+		pr_err("conn->conn_login is NULL\n");
+		dump_stack();
+		return;
+	}
+
+	if (login->first_request) {
+		struct iscsi_login_req *login_req =
+			(struct iscsi_login_req *)&rx_desc->iscsi_header;
+		/*
+		 * Setup the initial iscsi_login values from the leading
+		 * login request PDU.
+		 */
+		login->leading_connection = (!login_req->tsih) ? 1 : 0;
+		login->current_stage =
+			(login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
+			 >> 2;
+		login->version_min	= login_req->min_version;
+		login->version_max	= login_req->max_version;
+		memcpy(login->isid, login_req->isid, 6);
+		login->cmd_sn		= be32_to_cpu(login_req->cmdsn);
+		login->init_task_tag	= login_req->itt;
+		login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
+		login->cid		= be16_to_cpu(login_req->cid);
+		login->tsih		= be16_to_cpu(login_req->tsih);
+	}
+
+	memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
+
+	size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
+	pr_debug("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n",
+		 size, rx_buflen, MAX_KEY_VALUE_PAIRS);
+	memcpy(login->req_buf, &rx_desc->data[0], size);
+
+	complete(&isert_conn->conn_login_comp);
+}
+
+static void
+isert_release_cmd(struct iscsi_cmd *cmd)
+{
+	struct isert_cmd *isert_cmd = container_of(cmd, struct isert_cmd,
+						   iscsi_cmd);
+
+	pr_debug("Entering isert_release_cmd %p >>>>>>>>>>>>>>>.\n", isert_cmd);
+
+	kfree(cmd->buf_ptr);
+	kfree(cmd->tmr_req);
+
+	kmem_cache_free(isert_cmd_cache, isert_cmd);
+}
+
+static struct iscsi_cmd
+*isert_alloc_cmd(struct iscsi_conn *conn, gfp_t gfp)
+{
+	struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
+	struct isert_cmd *isert_cmd;
+
+	isert_cmd = kmem_cache_zalloc(isert_cmd_cache, gfp);
+	if (!isert_cmd) {
+		pr_err("Unable to allocate isert_cmd\n");
+		return NULL;
+	}
+	isert_cmd->conn = isert_conn;
+	isert_cmd->iscsi_cmd.release_cmd = &isert_release_cmd;
+
+	return &isert_cmd->iscsi_cmd;
+}
+
+static int
+isert_handle_scsi_cmd(struct isert_conn *isert_conn,
+		      struct isert_cmd *isert_cmd, struct iser_rx_desc *rx_desc,
+		      unsigned char *buf)
+{
+	struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
+	struct iscsi_conn *conn = isert_conn->conn;
+	struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
+	struct scatterlist *sg;
+	int imm_data, imm_data_len, unsol_data, sg_nents, rc;
+	bool dump_payload = false;
+
+	rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
+	if (rc < 0)
+		return rc;
+
+	imm_data = cmd->immediate_data;
+	imm_data_len = cmd->first_burst_len;
+	unsol_data = cmd->unsolicited_data;
+
+	rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
+	if (rc < 0) {
+		return 0;
+	} else if (rc > 0) {
+		dump_payload = true;
+		goto sequence_cmd;
+	}
+
+	if (!imm_data)
+		return 0;
+
+	sg = &cmd->se_cmd.t_data_sg[0];
+	sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
+
+	pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
+		 sg, sg_nents, &rx_desc->data[0], imm_data_len);
+
+	sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
+
+	cmd->write_data_done += imm_data_len;
+
+	if (cmd->write_data_done == cmd->se_cmd.data_length) {
+		spin_lock_bh(&cmd->istate_lock);
+		cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
+		cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
+		spin_unlock_bh(&cmd->istate_lock);
+	}
+
+sequence_cmd:
+	rc = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
+
+	if (!rc && dump_payload == false && unsol_data)
+		iscsit_set_unsoliticed_dataout(cmd);
+
+	if (rc == CMDSN_ERROR_CANNOT_RECOVER)
+		return iscsit_add_reject_from_cmd(
+			   ISCSI_REASON_PROTOCOL_ERROR,
+			   1, 0, (unsigned char *)hdr, cmd);
+
+	return 0;
+}
+
+static int
+isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
+			   struct iser_rx_desc *rx_desc, unsigned char *buf)
+{
+	struct scatterlist *sg_start;
+	struct iscsi_conn *conn = isert_conn->conn;
+	struct iscsi_cmd *cmd = NULL;
+	struct iscsi_data *hdr = (struct iscsi_data *)buf;
+	u32 unsol_data_len = ntoh24(hdr->dlength);
+	int rc, sg_nents, sg_off, page_off;
+
+	rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
+	if (rc < 0)
+		return rc;
+	else if (!cmd)
+		return 0;
+	/*
+	 * FIXME: Unexpected unsolicited_data out
+	 */
+	if (!cmd->unsolicited_data) {
+		pr_err("Received unexpected solicited data payload\n");
+		dump_stack();
+		return -1;
+	}
+
+	pr_debug("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n",
+		 unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length);
+
+	sg_off = cmd->write_data_done / PAGE_SIZE;
+	sg_start = &cmd->se_cmd.t_data_sg[sg_off];
+	sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
+	page_off = cmd->write_data_done % PAGE_SIZE;
+	/*
+	 * FIXME: Non page-aligned unsolicited_data out
+	 */
+	if (page_off) {
+		pr_err("Received unexpected non-page aligned data payload\n");
+		dump_stack();
+		return -1;
+	}
+	pr_debug("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n",
+		 sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len);
+
+	sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
+			    unsol_data_len);
+
+	rc = iscsit_check_dataout_payload(cmd, hdr, false);
+	if (rc < 0)
+		return rc;
+
+	return 0;
+}
+
+static int
+isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
+		uint32_t read_stag, uint64_t read_va,
+		uint32_t write_stag, uint64_t write_va)
+{
+	struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
+	struct iscsi_conn *conn = isert_conn->conn;
+	struct iscsi_cmd *cmd;
+	struct isert_cmd *isert_cmd;
+	int ret = -EINVAL;
+	u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
+
+	switch (opcode) {
+	case ISCSI_OP_SCSI_CMD:
+		cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
+		if (!cmd)
+			break;
+
+		isert_cmd = container_of(cmd, struct isert_cmd, iscsi_cmd);
+		isert_cmd->read_stag = read_stag;
+		isert_cmd->read_va = read_va;
+		isert_cmd->write_stag = write_stag;
+		isert_cmd->write_va = write_va;
+
+		ret = isert_handle_scsi_cmd(isert_conn, isert_cmd,
+					rx_desc, (unsigned char *)hdr);
+		break;
+	case ISCSI_OP_NOOP_OUT:
+		cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
+		if (!cmd)
+			break;
+
+		ret = iscsit_handle_nop_out(conn, cmd, (unsigned char *)hdr);
+		break;
+	case ISCSI_OP_SCSI_DATA_OUT:
+		ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
+						(unsigned char *)hdr);
+		break;
+	case ISCSI_OP_SCSI_TMFUNC:
+		cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
+		if (!cmd)
+			break;
+
+		ret = iscsit_handle_task_mgt_cmd(conn, cmd,
+						(unsigned char *)hdr);
+		break;
+	case ISCSI_OP_LOGOUT:
+		cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
+		if (!cmd)
+			break;
+
+		ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
+		if (ret > 0)
+			wait_for_completion_timeout(&conn->conn_logout_comp,
+						    SECONDS_FOR_LOGOUT_COMP *
+						    HZ);
+		break;
+	default:
+		pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
+		dump_stack();
+		break;
+	}
+
+	return ret;
+}
+
+static void
+isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
+{
+	struct iser_hdr *iser_hdr = &rx_desc->iser_header;
+	uint64_t read_va = 0, write_va = 0;
+	uint32_t read_stag = 0, write_stag = 0;
+	int rc;
+
+	switch (iser_hdr->flags & 0xF0) {
+	case ISCSI_CTRL:
+		if (iser_hdr->flags & ISER_RSV) {
+			read_stag = be32_to_cpu(iser_hdr->read_stag);
+			read_va = be64_to_cpu(iser_hdr->read_va);
+			pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
+				 read_stag, (unsigned long long)read_va);
+		}
+		if (iser_hdr->flags & ISER_WSV) {
+			write_stag = be32_to_cpu(iser_hdr->write_stag);
+			write_va = be64_to_cpu(iser_hdr->write_va);
+			pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
+				 write_stag, (unsigned long long)write_va);
+		}
+
+		pr_debug("ISER ISCSI_CTRL PDU\n");
+		break;
+	case ISER_HELLO:
+		pr_err("iSER Hello message\n");
+		break;
+	default:
+		pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
+		break;
+	}
+
+	rc = isert_rx_opcode(isert_conn, rx_desc,
+			     read_stag, read_va, write_stag, write_va);
+}
+
+static void
+isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
+		    unsigned long xfer_len)
+{
+	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+	struct iscsi_hdr *hdr;
+	u64 rx_dma;
+	int rx_buflen, outstanding;
+
+	if ((char *)desc == isert_conn->login_req_buf) {
+		rx_dma = isert_conn->login_req_dma;
+		rx_buflen = ISER_RX_LOGIN_SIZE;
+		pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
+			 rx_dma, rx_buflen);
+	} else {
+		rx_dma = desc->dma_addr;
+		rx_buflen = ISER_RX_PAYLOAD_SIZE;
+		pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
+			 rx_dma, rx_buflen);
+	}
+
+	ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
+
+	hdr = &desc->iscsi_header;
+	pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
+		 hdr->opcode, hdr->itt, hdr->flags,
+		 (int)(xfer_len - ISER_HEADERS_LEN));
+
+	if ((char *)desc == isert_conn->login_req_buf)
+		isert_rx_login_req(desc, xfer_len - ISER_HEADERS_LEN,
+				   isert_conn);
+	else
+		isert_rx_do_work(desc, isert_conn);
+
+	ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
+				      DMA_FROM_DEVICE);
+
+	isert_conn->post_recv_buf_count--;
+	pr_debug("iSERT: Decremented post_recv_buf_count: %d\n",
+		 isert_conn->post_recv_buf_count);
+
+	if ((char *)desc == isert_conn->login_req_buf)
+		return;
+
+	outstanding = isert_conn->post_recv_buf_count;
+	if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
+		int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
+				ISERT_MIN_POSTED_RX);
+		err = isert_post_recv(isert_conn, count);
+		if (err) {
+			pr_err("isert_post_recv() count: %d failed, %d\n",
+			       count, err);
+		}
+	}
+}
+
+static void
+isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
+{
+	struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
+	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+
+	pr_debug("isert_unmap_cmd >>>>>>>>>>>>>>>>>>>>>>>\n");
+
+	if (wr->sge) {
+		ib_dma_unmap_sg(ib_dev, wr->sge, wr->num_sge, DMA_TO_DEVICE);
+		wr->sge = NULL;
+	}
+
+	kfree(wr->send_wr);
+	wr->send_wr = NULL;
+
+	kfree(isert_cmd->ib_sge);
+	isert_cmd->ib_sge = NULL;
+}
+
+static void
+isert_put_cmd(struct isert_cmd *isert_cmd)
+{
+	struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
+	struct isert_conn *isert_conn = isert_cmd->conn;
+	struct iscsi_conn *conn;
+
+	pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
+
+	switch (cmd->iscsi_opcode) {
+	case ISCSI_OP_SCSI_CMD:
+		conn = isert_conn->conn;
+
+		spin_lock_bh(&conn->cmd_lock);
+		if (!list_empty(&cmd->i_conn_node))
+			list_del(&cmd->i_conn_node);
+		spin_unlock_bh(&conn->cmd_lock);
+
+		if (cmd->data_direction == DMA_TO_DEVICE)
+			iscsit_stop_dataout_timer(cmd);
+
+		isert_unmap_cmd(isert_cmd, isert_conn);
+		/*
+		 * Fall-through
+		 */
+	case ISCSI_OP_SCSI_TMFUNC:
+		transport_generic_free_cmd(&cmd->se_cmd, 0);
+		break;
+	case ISCSI_OP_REJECT:
+	case ISCSI_OP_NOOP_OUT:
+		conn = isert_conn->conn;
+
+		spin_lock_bh(&conn->cmd_lock);
+		if (!list_empty(&cmd->i_conn_node))
+			list_del(&cmd->i_conn_node);
+		spin_unlock_bh(&conn->cmd_lock);
+
+		/*
+		 * Handle special case for REJECT when iscsi_add_reject*() has
+		 * overwritten the original iscsi_opcode assignment, and the
+		 * associated cmd->se_cmd needs to be released.
+		 */
+		if (cmd->se_cmd.se_tfo != NULL) {
+			transport_generic_free_cmd(&cmd->se_cmd, 0);
+			break;
+		}
+		/*
+		 * Fall-through
+		 */
+	default:
+		isert_release_cmd(cmd);
+		break;
+	}
+}
+
+static void
+isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
+{
+	if (tx_desc->dma_addr != 0) {
+		pr_debug("Calling ib_dma_unmap_single for tx_desc->dma_addr\n");
+		ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
+				    ISER_HEADERS_LEN, DMA_TO_DEVICE);
+		tx_desc->dma_addr = 0;
+	}
+}
+
+static void
+isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
+		     struct ib_device *ib_dev)
+{
+	if (isert_cmd->sense_buf_dma != 0) {
+		pr_debug("Calling ib_dma_unmap_single for isert_cmd->sense_buf_dma\n");
+		ib_dma_unmap_single(ib_dev, isert_cmd->sense_buf_dma,
+				    isert_cmd->sense_buf_len, DMA_TO_DEVICE);
+		isert_cmd->sense_buf_dma = 0;
+	}
+
+	isert_unmap_tx_desc(tx_desc, ib_dev);
+	isert_put_cmd(isert_cmd);
+}
+
+static void
+isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
+			   struct isert_cmd *isert_cmd)
+{
+	struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
+	struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
+	struct se_cmd *se_cmd = &cmd->se_cmd;
+	struct ib_device *ib_dev = isert_cmd->conn->conn_cm_id->device;
+
+	iscsit_stop_dataout_timer(cmd);
+
+	if (wr->sge) {
+		pr_debug("isert_do_rdma_read_comp: Unmapping wr->sge from t_data_sg\n");
+		ib_dma_unmap_sg(ib_dev, wr->sge, wr->num_sge, DMA_TO_DEVICE);
+		wr->sge = NULL;
+	}
+
+	if (isert_cmd->ib_sge) {
+		pr_debug("isert_do_rdma_read_comp: Freeing isert_cmd->ib_sge\n");
+		kfree(isert_cmd->ib_sge);
+		isert_cmd->ib_sge = NULL;
+	}
+
+	cmd->write_data_done = se_cmd->data_length;
+
+	pr_debug("isert_do_rdma_read_comp, calling target_execute_cmd\n");
+	spin_lock_bh(&cmd->istate_lock);
+	cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
+	cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
+	spin_unlock_bh(&cmd->istate_lock);
+
+	target_execute_cmd(se_cmd);
+}
+
+static void
+isert_do_control_comp(struct work_struct *work)
+{
+	struct isert_cmd *isert_cmd = container_of(work,
+			struct isert_cmd, comp_work);
+	struct isert_conn *isert_conn = isert_cmd->conn;
+	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+	struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
+
+	switch (cmd->i_state) {
+	case ISTATE_SEND_TASKMGTRSP:
+		pr_debug("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n");
+
+		atomic_dec(&isert_conn->post_send_buf_count);
+		iscsit_tmr_post_handler(cmd, cmd->conn);
+
+		cmd->i_state = ISTATE_SENT_STATUS;
+		isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
+		break;
+	case ISTATE_SEND_REJECT:
+		pr_debug("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n");
+		atomic_dec(&isert_conn->post_send_buf_count);
+
+		cmd->i_state = ISTATE_SENT_STATUS;
+		complete(&cmd->reject_comp);
+		isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
+	case ISTATE_SEND_LOGOUTRSP:
+		pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
+		/*
+		 * Call atomic_dec(&isert_conn->post_send_buf_count)
+		 * from isert_free_conn()
+		 */
+		isert_conn->logout_posted = true;
+		iscsit_logout_post_handler(cmd, cmd->conn);
+		break;
+	default:
+		pr_err("Unknown do_control_comp i_state %d\n", cmd->i_state);
+		dump_stack();
+		break;
+	}
+}
+
+static void
+isert_response_completion(struct iser_tx_desc *tx_desc,
+			  struct isert_cmd *isert_cmd,
+			  struct isert_conn *isert_conn,
+			  struct ib_device *ib_dev)
+{
+	struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
+
+	if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
+	    cmd->i_state == ISTATE_SEND_LOGOUTRSP) {
+		isert_unmap_tx_desc(tx_desc, ib_dev);
+
+		INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
+		queue_work(isert_comp_wq, &isert_cmd->comp_work);
+		return;
+	}
+	atomic_dec(&isert_conn->post_send_buf_count);
+
+	cmd->i_state = ISTATE_SENT_STATUS;
+	isert_completion_put(tx_desc, isert_cmd, ib_dev);
+}
+
+static void
+isert_send_completion(struct iser_tx_desc *tx_desc,
+		      struct isert_conn *isert_conn)
+{
+	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+	struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
+	struct isert_rdma_wr *wr;
+
+	if (!isert_cmd) {
+		atomic_dec(&isert_conn->post_send_buf_count);
+		isert_unmap_tx_desc(tx_desc, ib_dev);
+		return;
+	}
+	wr = &isert_cmd->rdma_wr;
+
+	switch (wr->iser_ib_op) {
+	case ISER_IB_RECV:
+		pr_err("isert_send_completion: Got ISER_IB_RECV\n");
+		dump_stack();
+		break;
+	case ISER_IB_SEND:
+		pr_debug("isert_send_completion: Got ISER_IB_SEND\n");
+		isert_response_completion(tx_desc, isert_cmd,
+					  isert_conn, ib_dev);
+		break;
+	case ISER_IB_RDMA_WRITE:
+		pr_err("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
+		dump_stack();
+		break;
+	case ISER_IB_RDMA_READ:
+		pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
+
+		atomic_dec(&isert_conn->post_send_buf_count);
+		isert_completion_rdma_read(tx_desc, isert_cmd);
+		break;
+	default:
+		pr_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op);
+		dump_stack();
+		break;
+	}
+}
+
+static void
+isert_cq_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
+{
+	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+
+	if (tx_desc) {
+		struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
+
+		if (!isert_cmd)
+			isert_unmap_tx_desc(tx_desc, ib_dev);
+		else
+			isert_completion_put(tx_desc, isert_cmd, ib_dev);
+	}
+
+	if (isert_conn->post_recv_buf_count == 0 &&
+	    atomic_read(&isert_conn->post_send_buf_count) == 0) {
+		pr_debug("isert_cq_comp_err >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
+		pr_debug("Calling wake_up from isert_cq_comp_err\n");
+
+		isert_conn->state = ISER_CONN_TERMINATING;
+		wake_up(&isert_conn->conn_wait_comp_err);
+	}
+}
+
+static void
+isert_cq_tx_work(struct work_struct *work)
+{
+	struct isert_cq_desc *cq_desc = container_of(work,
+				struct isert_cq_desc, cq_tx_work);
+	struct isert_device *device = cq_desc->device;
+	int cq_index = cq_desc->cq_index;
+	struct ib_cq *tx_cq = device->dev_tx_cq[cq_index];
+	struct isert_conn *isert_conn;
+	struct iser_tx_desc *tx_desc;
+	struct ib_wc wc;
+
+	while (ib_poll_cq(tx_cq, 1, &wc) == 1) {
+		tx_desc = (struct iser_tx_desc *)(unsigned long)wc.wr_id;
+		isert_conn = wc.qp->qp_context;
+
+		if (wc.status == IB_WC_SUCCESS) {
+			isert_send_completion(tx_desc, isert_conn);
+		} else {
+			pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
+			pr_debug("TX wc.status: 0x%08x\n", wc.status);
+			atomic_dec(&isert_conn->post_send_buf_count);
+			isert_cq_comp_err(tx_desc, isert_conn);
+		}
+	}
+
+	ib_req_notify_cq(tx_cq, IB_CQ_NEXT_COMP);
+}
+
+static void
+isert_cq_tx_callback(struct ib_cq *cq, void *context)
+{
+	struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
+
+	INIT_WORK(&cq_desc->cq_tx_work, isert_cq_tx_work);
+	queue_work(isert_comp_wq, &cq_desc->cq_tx_work);
+}
+
+static void
+isert_cq_rx_work(struct work_struct *work)
+{
+	struct isert_cq_desc *cq_desc = container_of(work,
+			struct isert_cq_desc, cq_rx_work);
+	struct isert_device *device = cq_desc->device;
+	int cq_index = cq_desc->cq_index;
+	struct ib_cq *rx_cq = device->dev_rx_cq[cq_index];
+	struct isert_conn *isert_conn;
+	struct iser_rx_desc *rx_desc;
+	struct ib_wc wc;
+	unsigned long xfer_len;
+
+	while (ib_poll_cq(rx_cq, 1, &wc) == 1) {
+		rx_desc = (struct iser_rx_desc *)(unsigned long)wc.wr_id;
+		isert_conn = wc.qp->qp_context;
+
+		if (wc.status == IB_WC_SUCCESS) {
+			xfer_len = (unsigned long)wc.byte_len;
+			isert_rx_completion(rx_desc, isert_conn, xfer_len);
+		} else {
+			pr_debug("RX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
+			if (wc.status != IB_WC_WR_FLUSH_ERR)
+				pr_debug("RX wc.status: 0x%08x\n", wc.status);
+
+			isert_conn->post_recv_buf_count--;
+			isert_cq_comp_err(NULL, isert_conn);
+		}
+	}
+
+	ib_req_notify_cq(rx_cq, IB_CQ_NEXT_COMP);
+}
+
+static void
+isert_cq_rx_callback(struct ib_cq *cq, void *context)
+{
+	struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
+
+	INIT_WORK(&cq_desc->cq_rx_work, isert_cq_rx_work);
+	queue_work(isert_rx_wq, &cq_desc->cq_rx_work);
+}
+
+static int
+isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
+{
+	struct ib_send_wr *wr_failed;
+	int ret;
+
+	atomic_inc(&isert_conn->post_send_buf_count);
+
+	ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr,
+			   &wr_failed);
+	if (ret) {
+		pr_err("ib_post_send failed with %d\n", ret);
+		atomic_dec(&isert_conn->post_send_buf_count);
+		return ret;
+	}
+	return ret;
+}
+
+static int
+isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
+{
+	struct isert_cmd *isert_cmd = container_of(cmd,
+					struct isert_cmd, iscsi_cmd);
+	struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
+	struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
+	struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
+				&isert_cmd->tx_desc.iscsi_header;
+
+	isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
+	iscsit_build_rsp_pdu(cmd, conn, true, hdr);
+	isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
+	/*
+	 * Attach SENSE DATA payload to iSCSI Response PDU
+	 */
+	if (cmd->se_cmd.sense_buffer &&
+	    ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
+	    (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
+		struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+		struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
+		u32 padding, sense_len;
+
+		put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
+				   cmd->sense_buffer);
+		cmd->se_cmd.scsi_sense_length += sizeof(__be16);
+
+		padding = -(cmd->se_cmd.scsi_sense_length) & 3;
+		hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
+		sense_len = cmd->se_cmd.scsi_sense_length + padding;
+
+		isert_cmd->sense_buf_dma = ib_dma_map_single(ib_dev,
+				(void *)cmd->sense_buffer, sense_len,
+				DMA_TO_DEVICE);
+
+		isert_cmd->sense_buf_len = sense_len;
+		tx_dsg->addr	= isert_cmd->sense_buf_dma;
+		tx_dsg->length	= sense_len;
+		tx_dsg->lkey	= isert_conn->conn_mr->lkey;
+		isert_cmd->tx_desc.num_sge = 2;
+	}
+
+	isert_init_send_wr(isert_cmd, send_wr);
+
+	pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
+
+	return isert_post_response(isert_conn, isert_cmd);
+}
+
+static int
+isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
+		bool nopout_response)
+{
+	struct isert_cmd *isert_cmd = container_of(cmd,
+				struct isert_cmd, iscsi_cmd);
+	struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
+	struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
+
+	isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
+	iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
+			       &isert_cmd->tx_desc.iscsi_header,
+			       nopout_response);
+	isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
+	isert_init_send_wr(isert_cmd, send_wr);
+
+	pr_debug("Posting NOPIN Reponse IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
+
+	return isert_post_response(isert_conn, isert_cmd);
+}
+
+static int
+isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
+{
+	struct isert_cmd *isert_cmd = container_of(cmd,
+				struct isert_cmd, iscsi_cmd);
+	struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
+	struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
+
+	isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
+	iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
+				&isert_cmd->tx_desc.iscsi_header);
+	isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
+	isert_init_send_wr(isert_cmd, send_wr);
+
+	pr_debug("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
+
+	return isert_post_response(isert_conn, isert_cmd);
+}
+
+static int
+isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
+{
+	struct isert_cmd *isert_cmd = container_of(cmd,
+				struct isert_cmd, iscsi_cmd);
+	struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
+	struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
+
+	isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
+	iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
+				  &isert_cmd->tx_desc.iscsi_header);
+	isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
+	isert_init_send_wr(isert_cmd, send_wr);
+
+	pr_debug("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
+
+	return isert_post_response(isert_conn, isert_cmd);
+}
+
+static int
+isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
+{
+	struct isert_cmd *isert_cmd = container_of(cmd,
+				struct isert_cmd, iscsi_cmd);
+	struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
+	struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
+
+	isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
+	iscsit_build_reject(cmd, conn, (struct iscsi_reject *)
+				&isert_cmd->tx_desc.iscsi_header);
+	isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
+	isert_init_send_wr(isert_cmd, send_wr);
+
+	pr_debug("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
+
+	return isert_post_response(isert_conn, isert_cmd);
+}
+
+static int
+isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
+		    struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
+		    u32 data_left, u32 offset)
+{
+	struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
+	struct scatterlist *sg_start, *tmp_sg;
+	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+	u32 sg_off, page_off;
+	int i = 0, sg_nents;
+
+	sg_off = offset / PAGE_SIZE;
+	sg_start = &cmd->se_cmd.t_data_sg[sg_off];
+	sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
+	page_off = offset % PAGE_SIZE;
+
+	send_wr->sg_list = ib_sge;
+	send_wr->num_sge = sg_nents;
+	send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
+	/*
+	 * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
+	 */
+	for_each_sg(sg_start, tmp_sg, sg_nents, i) {
+		pr_debug("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n",
+			 (unsigned long long)tmp_sg->dma_address,
+			 tmp_sg->length, page_off);
+
+		ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
+		ib_sge->length = min_t(u32, data_left,
+				ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
+		ib_sge->lkey = isert_conn->conn_mr->lkey;
+
+		pr_debug("RDMA ib_sge: addr: 0x%16llx  length: %u\n",
+			 ib_sge->addr, ib_sge->length);
+		page_off = 0;
+		data_left -= ib_sge->length;
+		ib_sge++;
+		pr_debug("Incrementing ib_sge pointer to %p\n", ib_sge);
+	}
+
+	pr_debug("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
+		 send_wr->sg_list, send_wr->num_sge);
+
+	return sg_nents;
+}
+
+static int
+isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
+{
+	struct se_cmd *se_cmd = &cmd->se_cmd;
+	struct isert_cmd *isert_cmd = container_of(cmd,
+					struct isert_cmd, iscsi_cmd);
+	struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
+	struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
+	struct ib_send_wr *wr_failed, *send_wr;
+	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+	struct ib_sge *ib_sge;
+	struct scatterlist *sg;
+	u32 offset = 0, data_len, data_left, rdma_write_max;
+	int rc, ret = 0, count, sg_nents, i, ib_sge_cnt;
+
+	pr_debug("RDMA_WRITE: data_length: %u\n", se_cmd->data_length);
+
+	sg = &se_cmd->t_data_sg[0];
+	sg_nents = se_cmd->t_data_nents;
+
+	count = ib_dma_map_sg(ib_dev, sg, sg_nents, DMA_TO_DEVICE);
+	if (unlikely(!count)) {
+		pr_err("Unable to map put_datain SGs\n");
+		return -EINVAL;
+	}
+	wr->sge = sg;
+	wr->num_sge = sg_nents;
+	pr_debug("Mapped IB count: %u sg: %p sg_nents: %u for RDMA_WRITE\n",
+		 count, sg, sg_nents);
+
+	ib_sge = kzalloc(sizeof(struct ib_sge) * sg_nents, GFP_KERNEL);
+	if (!ib_sge) {
+		pr_warn("Unable to allocate datain ib_sge\n");
+		ret = -ENOMEM;
+		goto unmap_sg;
+	}
+	isert_cmd->ib_sge = ib_sge;
+
+	pr_debug("Allocated ib_sge: %p from t_data_ents: %d for RDMA_WRITE\n",
+		 ib_sge, se_cmd->t_data_nents);
+
+	wr->send_wr_num = DIV_ROUND_UP(sg_nents, isert_conn->max_sge);
+	wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
+				GFP_KERNEL);
+	if (!wr->send_wr) {
+		pr_err("Unable to allocate wr->send_wr\n");
+		ret = -ENOMEM;
+		goto unmap_sg;
+	}
+	pr_debug("Allocated wr->send_wr: %p wr->send_wr_num: %u\n",
+		 wr->send_wr, wr->send_wr_num);
+
+	iscsit_increment_maxcmdsn(cmd, conn->sess);
+	cmd->stat_sn = conn->stat_sn++;
+
+	wr->isert_cmd = isert_cmd;
+	rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
+	data_left = se_cmd->data_length;
+
+	for (i = 0; i < wr->send_wr_num; i++) {
+		send_wr = &isert_cmd->rdma_wr.send_wr[i];
+		data_len = min(data_left, rdma_write_max);
+
+		send_wr->opcode = IB_WR_RDMA_WRITE;
+		send_wr->send_flags = 0;
+		send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
+		send_wr->wr.rdma.rkey = isert_cmd->read_stag;
+
+		ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
+					send_wr, data_len, offset);
+		ib_sge += ib_sge_cnt;
+
+		if (i + 1 == wr->send_wr_num)
+			send_wr->next = &isert_cmd->tx_desc.send_wr;
+		else
+			send_wr->next = &wr->send_wr[i + 1];
+
+		offset += data_len;
+		data_left -= data_len;
+	}
+	/*
+	 * Build isert_conn->tx_desc for iSCSI response PDU and attach
+	 */
+	isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
+	iscsit_build_rsp_pdu(cmd, conn, false, (struct iscsi_scsi_rsp *)
+			     &isert_cmd->tx_desc.iscsi_header);
+	isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
+	isert_init_send_wr(isert_cmd, &isert_cmd->tx_desc.send_wr);
+
+	atomic_inc(&isert_conn->post_send_buf_count);
+
+	rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
+	if (rc) {
+		pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
+		atomic_dec(&isert_conn->post_send_buf_count);
+	}
+	pr_debug("Posted RDMA_WRITE + Response for iSER Data READ\n");
+	return 1;
+
+unmap_sg:
+	ib_dma_unmap_sg(ib_dev, sg, sg_nents, DMA_TO_DEVICE);
+	return ret;
+}
+
+static int
+isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
+{
+	struct se_cmd *se_cmd = &cmd->se_cmd;
+	struct isert_cmd *isert_cmd = container_of(cmd,
+					struct isert_cmd, iscsi_cmd);
+	struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
+	struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
+	struct ib_send_wr *wr_failed, *send_wr;
+	struct ib_sge *ib_sge;
+	struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
+	struct scatterlist *sg_start;
+	u32 sg_off, sg_nents, page_off, va_offset = 0;
+	u32 offset = 0, data_len, data_left, rdma_write_max;
+	int rc, ret = 0, count, i, ib_sge_cnt;
+
+	pr_debug("RDMA_READ: data_length: %u write_data_done: %u\n",
+		 se_cmd->data_length, cmd->write_data_done);
+
+	sg_off = cmd->write_data_done / PAGE_SIZE;
+	sg_start = &cmd->se_cmd.t_data_sg[sg_off];
+	page_off = cmd->write_data_done % PAGE_SIZE;
+
+	pr_debug("RDMA_READ: sg_off: %d, sg_start: %p page_off: %d\n",
+		 sg_off, sg_start, page_off);
+
+	data_left = se_cmd->data_length - cmd->write_data_done;
+	sg_nents = se_cmd->t_data_nents - sg_off;
+
+	pr_debug("RDMA_READ: data_left: %d, sg_nents: %d\n",
+		 data_left, sg_nents);
+
+	count = ib_dma_map_sg(ib_dev, sg_start, sg_nents, DMA_FROM_DEVICE);
+	if (unlikely(!count)) {
+		pr_err("Unable to map get_dataout SGs\n");
+		return -EINVAL;
+	}
+	wr->sge = sg_start;
+	wr->num_sge = sg_nents;
+	pr_debug("Mapped IB count: %u sg_start: %p sg_nents: %u for RDMA_READ\n",
+		 count, sg_start, sg_nents);
+
+	ib_sge = kzalloc(sizeof(struct ib_sge) * sg_nents, GFP_KERNEL);
+	if (!ib_sge) {
+		pr_warn("Unable to allocate dataout ib_sge\n");
+		ret = -ENOMEM;
+		goto unmap_sg;
+	}
+	isert_cmd->ib_sge = ib_sge;
+
+	pr_debug("Using ib_sge: %p from sg_ents: %d for RDMA_READ\n",
+		 ib_sge, sg_nents);
+
+	wr->send_wr_num = DIV_ROUND_UP(sg_nents, isert_conn->max_sge);
+	wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
+				GFP_KERNEL);
+	if (!wr->send_wr) {
+		pr_debug("Unable to allocate wr->send_wr\n");
+		ret = -ENOMEM;
+		goto unmap_sg;
+	}
+	pr_debug("Allocated wr->send_wr: %p wr->send_wr_num: %u\n",
+		 wr->send_wr, wr->send_wr_num);
+
+	isert_cmd->tx_desc.isert_cmd = isert_cmd;
+
+	wr->iser_ib_op = ISER_IB_RDMA_READ;
+	wr->isert_cmd = isert_cmd;
+	rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
+	offset = cmd->write_data_done;
+
+	for (i = 0; i < wr->send_wr_num; i++) {
+		send_wr = &isert_cmd->rdma_wr.send_wr[i];
+		data_len = min(data_left, rdma_write_max);
+
+		send_wr->opcode = IB_WR_RDMA_READ;
+		send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
+		send_wr->wr.rdma.rkey = isert_cmd->write_stag;
+
+		ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
+					send_wr, data_len, offset);
+		ib_sge += ib_sge_cnt;
+
+		if (i + 1 == wr->send_wr_num)
+			send_wr->send_flags = IB_SEND_SIGNALED;
+		else
+			send_wr->next = &wr->send_wr[i + 1];
+
+		offset += data_len;
+		va_offset += data_len;
+		data_left -= data_len;
+	}
+
+	atomic_inc(&isert_conn->post_send_buf_count);
+
+	rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
+	if (rc) {
+		pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
+		atomic_dec(&isert_conn->post_send_buf_count);
+	}
+	pr_debug("Posted RDMA_READ memory for ISER Data WRITE\n");
+	return 0;
+
+unmap_sg:
+	ib_dma_unmap_sg(ib_dev, sg_start, sg_nents, DMA_FROM_DEVICE);
+	return ret;
+}
+
+static int
+isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
+{
+	int ret;
+
+	switch (state) {
+	case ISTATE_SEND_NOPIN_WANT_RESPONSE:
+		ret = isert_put_nopin(cmd, conn, false);
+		break;
+	default:
+		pr_err("Unknown immediate state: 0x%02x\n", state);
+		ret = -EINVAL;
+		break;
+	}
+
+	return ret;
+}
+
+static int
+isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
+{
+	int ret;
+
+	switch (state) {
+	case ISTATE_SEND_LOGOUTRSP:
+		ret = isert_put_logout_rsp(cmd, conn);
+		if (!ret) {
+			pr_debug("Returning iSER Logout -EAGAIN\n");
+			ret = -EAGAIN;
+		}
+		break;
+	case ISTATE_SEND_NOPIN:
+		ret = isert_put_nopin(cmd, conn, true);
+		break;
+	case ISTATE_SEND_TASKMGTRSP:
+		ret = isert_put_tm_rsp(cmd, conn);
+		break;
+	case ISTATE_SEND_REJECT:
+		ret = isert_put_reject(cmd, conn);
+		break;
+	case ISTATE_SEND_STATUS:
+		/*
+		 * Special case for sending non GOOD SCSI status from TX thread
+		 * context during pre se_cmd excecution failure.
+		 */
+		ret = isert_put_response(conn, cmd);
+		break;
+	default:
+		pr_err("Unknown response state: 0x%02x\n", state);
+		ret = -EINVAL;
+		break;
+	}
+
+	return ret;
+}
+
+static int
+isert_setup_np(struct iscsi_np *np,
+	       struct __kernel_sockaddr_storage *ksockaddr)
+{
+	struct isert_np *isert_np;
+	struct rdma_cm_id *isert_lid;
+	struct sockaddr *sa;
+	int ret;
+
+	isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
+	if (!isert_np) {
+		pr_err("Unable to allocate struct isert_np\n");
+		return -ENOMEM;
+	}
+	init_waitqueue_head(&isert_np->np_accept_wq);
+	mutex_init(&isert_np->np_accept_mutex);
+	INIT_LIST_HEAD(&isert_np->np_accept_list);
+	init_completion(&isert_np->np_login_comp);
+
+	sa = (struct sockaddr *)ksockaddr;
+	pr_debug("ksockaddr: %p, sa: %p\n", ksockaddr, sa);
+	/*
+	 * Setup the np->np_sockaddr from the passed sockaddr setup
+	 * in iscsi_target_configfs.c code..
+	 */
+	memcpy(&np->np_sockaddr, ksockaddr,
+	       sizeof(struct __kernel_sockaddr_storage));
+
+	isert_lid = rdma_create_id(isert_cma_handler, np, RDMA_PS_TCP,
+				IB_QPT_RC);
+	if (IS_ERR(isert_lid)) {
+		pr_err("rdma_create_id() for isert_listen_handler failed: %ld\n",
+		       PTR_ERR(isert_lid));
+		ret = PTR_ERR(isert_lid);
+		goto out;
+	}
+
+	ret = rdma_bind_addr(isert_lid, sa);
+	if (ret) {
+		pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret);
+		goto out_lid;
+	}
+
+	ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG);
+	if (ret) {
+		pr_err("rdma_listen() for isert_lid failed: %d\n", ret);
+		goto out_lid;
+	}
+
+	isert_np->np_cm_id = isert_lid;
+	np->np_context = isert_np;
+	pr_debug("Setup isert_lid->context: %p\n", isert_lid->context);
+
+	return 0;
+
+out_lid:
+	rdma_destroy_id(isert_lid);
+out:
+	kfree(isert_np);
+	return ret;
+}
+
+static int
+isert_check_accept_queue(struct isert_np *isert_np)
+{
+	int empty;
+
+	mutex_lock(&isert_np->np_accept_mutex);
+	empty = list_empty(&isert_np->np_accept_list);
+	mutex_unlock(&isert_np->np_accept_mutex);
+
+	return empty;
+}
+
+static int
+isert_rdma_accept(struct isert_conn *isert_conn)
+{
+	struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
+	struct rdma_conn_param cp;
+	int ret;
+
+	memset(&cp, 0, sizeof(struct rdma_conn_param));
+	cp.responder_resources = isert_conn->responder_resources;
+	cp.initiator_depth = isert_conn->initiator_depth;
+	cp.retry_count = 7;
+	cp.rnr_retry_count = 7;
+
+	pr_debug("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n");
+
+	ret = rdma_accept(cm_id, &cp);
+	if (ret) {
+		pr_err("rdma_accept() failed with: %d\n", ret);
+		return ret;
+	}
+
+	pr_debug("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n");
+
+	return 0;
+}
+
+static int
+isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
+{
+	struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
+	int ret;
+
+	pr_debug("isert_get_login_rx before conn_login_comp conn: %p\n", conn);
+
+	ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp);
+	if (ret)
+		return ret;
+
+	pr_debug("isert_get_login_rx processing login->req: %p\n", login->req);
+	return 0;
+}
+
+static void
+isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
+		    struct isert_conn *isert_conn)
+{
+	struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
+	struct rdma_route *cm_route = &cm_id->route;
+	struct sockaddr_in *sock_in;
+	struct sockaddr_in6 *sock_in6;
+
+	conn->login_family = np->np_sockaddr.ss_family;
+
+	if (np->np_sockaddr.ss_family == AF_INET6) {
+		sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
+		snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
+			 &sock_in6->sin6_addr.in6_u);
+		conn->login_port = ntohs(sock_in6->sin6_port);
+
+		sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
+		snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
+			 &sock_in6->sin6_addr.in6_u);
+		conn->local_port = ntohs(sock_in6->sin6_port);
+	} else {
+		sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
+		sprintf(conn->login_ip, "%pI4",
+			&sock_in->sin_addr.s_addr);
+		conn->login_port = ntohs(sock_in->sin_port);
+
+		sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
+		sprintf(conn->local_ip, "%pI4",
+			&sock_in->sin_addr.s_addr);
+		conn->local_port = ntohs(sock_in->sin_port);
+	}
+}
+
+static int
+isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
+{
+	struct isert_np *isert_np = (struct isert_np *)np->np_context;
+	struct isert_conn *isert_conn;
+	int max_accept = 0, ret;
+
+accept_wait:
+	ret = wait_event_interruptible(isert_np->np_accept_wq,
+			!isert_check_accept_queue(isert_np) ||
+			np->np_thread_state == ISCSI_NP_THREAD_RESET);
+	if (max_accept > 5)
+		return -ENODEV;
+
+	spin_lock_bh(&np->np_thread_lock);
+	if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
+		spin_unlock_bh(&np->np_thread_lock);
+		pr_err("ISCSI_NP_THREAD_RESET for isert_accept_np\n");
+		return -ENODEV;
+	}
+	spin_unlock_bh(&np->np_thread_lock);
+
+	mutex_lock(&isert_np->np_accept_mutex);
+	if (list_empty(&isert_np->np_accept_list)) {
+		mutex_unlock(&isert_np->np_accept_mutex);
+		max_accept++;
+		goto accept_wait;
+	}
+	isert_conn = list_first_entry(&isert_np->np_accept_list,
+			struct isert_conn, conn_accept_node);
+	list_del_init(&isert_conn->conn_accept_node);
+	mutex_unlock(&isert_np->np_accept_mutex);
+
+	conn->context = isert_conn;
+	isert_conn->conn = conn;
+	max_accept = 0;
+
+	ret = isert_rdma_post_recvl(isert_conn);
+	if (ret)
+		return ret;
+
+	ret = isert_rdma_accept(isert_conn);
+	if (ret)
+		return ret;
+
+	isert_set_conn_info(np, conn, isert_conn);
+
+	pr_debug("Processing isert_accept_np: isert_conn: %p\n", isert_conn);
+	return 0;
+}
+
+static void
+isert_free_np(struct iscsi_np *np)
+{
+	struct isert_np *isert_np = (struct isert_np *)np->np_context;
+
+	rdma_destroy_id(isert_np->np_cm_id);
+
+	np->np_context = NULL;
+	kfree(isert_np);
+}
+
+static void isert_free_conn(struct iscsi_conn *conn)
+{
+	struct isert_conn *isert_conn = conn->context;
+
+	pr_debug("isert_free_conn: Starting \n");
+	/*
+	 * Decrement post_send_buf_count for special case when called
+	 * from isert_do_control_comp() -> iscsit_logout_post_handler()
+	 */
+	if (isert_conn->logout_posted)
+		atomic_dec(&isert_conn->post_send_buf_count);
+
+	if (isert_conn->conn_cm_id)
+		rdma_disconnect(isert_conn->conn_cm_id);
+	/*
+	 * Only wait for conn_wait_comp_err if the isert_conn made it
+	 * into full feature phase..
+	 */
+	if (isert_conn->state > ISER_CONN_INIT) {
+		pr_debug("isert_free_conn: Before wait_event comp_err %d\n",
+			 isert_conn->state);
+		wait_event(isert_conn->conn_wait_comp_err,
+			   isert_conn->state == ISER_CONN_TERMINATING);
+		pr_debug("isert_free_conn: After wait_event #1 >>>>>>>>>>>>\n");
+	}
+
+	pr_debug("isert_free_conn: wait_event conn_wait %d\n", isert_conn->state);
+	wait_event(isert_conn->conn_wait, isert_conn->state == ISER_CONN_DOWN);
+	pr_debug("isert_free_conn: After wait_event #2 >>>>>>>>>>>>>>>>>>>>\n");
+
+	isert_put_conn(isert_conn);
+}
+
+static struct iscsit_transport iser_target_transport = {
+	.name			= "IB/iSER",
+	.transport_type		= ISCSI_INFINIBAND,
+	.owner			= THIS_MODULE,
+	.iscsit_setup_np	= isert_setup_np,
+	.iscsit_accept_np	= isert_accept_np,
+	.iscsit_free_np		= isert_free_np,
+	.iscsit_free_conn	= isert_free_conn,
+	.iscsit_alloc_cmd	= isert_alloc_cmd,
+	.iscsit_get_login_rx	= isert_get_login_rx,
+	.iscsit_put_login_tx	= isert_put_login_tx,
+	.iscsit_immediate_queue	= isert_immediate_queue,
+	.iscsit_response_queue	= isert_response_queue,
+	.iscsit_get_dataout	= isert_get_dataout,
+	.iscsit_queue_data_in	= isert_put_datain,
+	.iscsit_queue_status	= isert_put_response,
+};
+
+static int __init isert_init(void)
+{
+	int ret;
+
+	isert_rx_wq = alloc_workqueue("isert_rx_wq", 0, 0);
+	if (!isert_rx_wq) {
+		pr_err("Unable to allocate isert_rx_wq\n");
+		return -ENOMEM;
+	}
+
+	isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0);
+	if (!isert_comp_wq) {
+		pr_err("Unable to allocate isert_comp_wq\n");
+		ret = -ENOMEM;
+		goto destroy_rx_wq;
+	}
+
+	isert_cmd_cache = kmem_cache_create("isert_cmd_cache",
+			sizeof(struct isert_cmd), __alignof__(struct isert_cmd),
+			0, NULL);
+	if (!isert_cmd_cache) {
+		pr_err("Unable to create isert_cmd_cache\n");
+		ret = -ENOMEM;
+		goto destroy_tx_cq;
+	}
+
+	iscsit_register_transport(&iser_target_transport);
+	pr_debug("iSER_TARGET[0] - Loaded iser_target_transport\n");
+	return 0;
+
+destroy_tx_cq:
+	destroy_workqueue(isert_comp_wq);
+destroy_rx_wq:
+	destroy_workqueue(isert_rx_wq);
+	return ret;
+}
+
+static void __exit isert_exit(void)
+{
+	kmem_cache_destroy(isert_cmd_cache);
+	destroy_workqueue(isert_comp_wq);
+	destroy_workqueue(isert_rx_wq);
+	iscsit_unregister_transport(&iser_target_transport);
+	pr_debug("iSER_TARGET[0] - Released iser_target_transport\n");
+}
+
+MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
+MODULE_VERSION("0.1");
+MODULE_AUTHOR("[e-mail]");
+MODULE_LICENSE("GPL");
+
+module_init(isert_init);
+module_exit(isert_exit);

drivers/infiniband/ulp/isert/ib_isert.h

···
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <rdma/ib_verbs.h>
+#include <rdma/rdma_cm.h>
+
+#define ISERT_RDMA_LISTEN_BACKLOG	10
+
+enum isert_desc_type {
+	ISCSI_TX_CONTROL,
+	ISCSI_TX_DATAIN
+};
+
+enum iser_ib_op_code {
+	ISER_IB_RECV,
+	ISER_IB_SEND,
+	ISER_IB_RDMA_WRITE,
+	ISER_IB_RDMA_READ,
+};
+
+enum iser_conn_state {
+	ISER_CONN_INIT,
+	ISER_CONN_UP,
+	ISER_CONN_TERMINATING,
+	ISER_CONN_DOWN,
+};
+
+struct iser_rx_desc {
+	struct iser_hdr iser_header;
+	struct iscsi_hdr iscsi_header;
+	char		data[ISER_RECV_DATA_SEG_LEN];
+	u64		dma_addr;
+	struct ib_sge	rx_sg;
+	char		pad[ISER_RX_PAD_SIZE];
+} __packed;
+
+struct iser_tx_desc {
+	struct iser_hdr iser_header;
+	struct iscsi_hdr iscsi_header;
+	enum isert_desc_type type;
+	u64		dma_addr;
+	struct ib_sge	tx_sg[2];
+	int		num_sge;
+	struct isert_cmd *isert_cmd;
+	struct ib_send_wr send_wr;
+} __packed;
+
+struct isert_rdma_wr {
+	struct list_head	wr_list;
+	struct isert_cmd	*isert_cmd;
+	enum iser_ib_op_code	iser_ib_op;
+	struct ib_sge		*ib_sge;
+	int			num_sge;
+	struct scatterlist	*sge;
+	int			send_wr_num;
+	struct ib_send_wr	*send_wr;
+};
+
+struct isert_cmd {
+	uint32_t		read_stag;
+	uint32_t		write_stag;
+	uint64_t		read_va;
+	uint64_t		write_va;
+	u64			sense_buf_dma;
+	u32			sense_buf_len;
+	u32			read_va_off;
+	u32			write_va_off;
+	u32			rdma_wr_num;
+	struct isert_conn	*conn;
+	struct iscsi_cmd	iscsi_cmd;
+	struct ib_sge		*ib_sge;
+	struct iser_tx_desc	tx_desc;
+	struct isert_rdma_wr	rdma_wr;
+	struct work_struct	comp_work;
+};
+
+struct isert_device;
+
+struct isert_conn {
+	enum iser_conn_state	state;
+	bool			logout_posted;
+	int			post_recv_buf_count;
+	atomic_t		post_send_buf_count;
+	u32			responder_resources;
+	u32			initiator_depth;
+	u32			max_sge;
+	char			*login_buf;
+	char			*login_req_buf;
+	char			*login_rsp_buf;
+	u64			login_req_dma;
+	u64			login_rsp_dma;
+	unsigned int		conn_rx_desc_head;
+	struct iser_rx_desc	*conn_rx_descs;
+	struct ib_recv_wr	conn_rx_wr[ISERT_MIN_POSTED_RX];
+	struct iscsi_conn	*conn;
+	struct list_head	conn_accept_node;
+	struct completion	conn_login_comp;
+	struct iser_tx_desc	conn_login_tx_desc;
+	struct rdma_cm_id	*conn_cm_id;
+	struct ib_pd		*conn_pd;
+	struct ib_mr		*conn_mr;
+	struct ib_qp		*conn_qp;
+	struct isert_device	*conn_device;
+	struct work_struct	conn_logout_work;
+	wait_queue_head_t	conn_wait;
+	wait_queue_head_t	conn_wait_comp_err;
+	struct kref		conn_kref;
+};
+
+#define ISERT_MAX_CQ 64
+
+struct isert_cq_desc {
+	struct isert_device	*device;
+	int			cq_index;
+	struct work_struct	cq_rx_work;
+	struct work_struct	cq_tx_work;
+};
+
+struct isert_device {
+	int			cqs_used;
+	int			refcount;
+	int			cq_active_qps[ISERT_MAX_CQ];
+	struct ib_device	*ib_device;
+	struct ib_pd		*dev_pd;
+	struct ib_mr		*dev_mr;
+	struct ib_cq		*dev_rx_cq[ISERT_MAX_CQ];
+	struct ib_cq		*dev_tx_cq[ISERT_MAX_CQ];
+	struct isert_cq_desc	*cq_desc;
+	struct list_head	dev_node;
+};
+
+struct isert_np {
+	wait_queue_head_t	np_accept_wq;
+	struct rdma_cm_id	*np_cm_id;
+	struct mutex		np_accept_mutex;
+	struct list_head	np_accept_list;
+	struct completion	np_login_comp;
+};

drivers/infiniband/ulp/isert/isert_proto.h

···
+/* From iscsi_iser.h */
+
+struct iser_hdr {
+	u8	flags;
+	u8	rsvd[3];
+	__be32	write_stag; /* write rkey */
+	__be64	write_va;
+	__be32	read_stag;  /* read rkey */
+	__be64	read_va;
+} __packed;
+
+/*Constant PDU lengths calculations */
+#define ISER_HEADERS_LEN  (sizeof(struct iser_hdr) + sizeof(struct iscsi_hdr))
+
+#define ISER_RECV_DATA_SEG_LEN  8192
+#define ISER_RX_PAYLOAD_SIZE    (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN)
+#define ISER_RX_LOGIN_SIZE      (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)
+
+/* QP settings */
+/* Maximal bounds on received asynchronous PDUs */
+#define ISERT_MAX_TX_MISC_PDUS	4 /* NOOP_IN(2) , ASYNC_EVENT(2)   */
+
+#define ISERT_MAX_RX_MISC_PDUS	6 /* NOOP_OUT(2), TEXT(1),         *
+				   * SCSI_TMFUNC(2), LOGOUT(1) */
+
+#define ISCSI_DEF_XMIT_CMDS_MAX 128 /* from libiscsi.h, must be power of 2 */
+
+#define ISERT_QP_MAX_RECV_DTOS	(ISCSI_DEF_XMIT_CMDS_MAX)
+
+#define ISERT_MIN_POSTED_RX	(ISCSI_DEF_XMIT_CMDS_MAX >> 2)
+
+#define ISERT_INFLIGHT_DATAOUTS	8
+
+#define ISERT_QP_MAX_REQ_DTOS	(ISCSI_DEF_XMIT_CMDS_MAX *    \
+				(1 + ISERT_INFLIGHT_DATAOUTS) + \
+				ISERT_MAX_TX_MISC_PDUS	+ \
+				ISERT_MAX_RX_MISC_PDUS)
+
+#define ISER_RX_PAD_SIZE	(ISER_RECV_DATA_SEG_LEN + 4096 - \
+		(ISER_RX_PAYLOAD_SIZE + sizeof(u64) + sizeof(struct ib_sge)))
+
+#define ISER_VER	0x10
+#define ISER_WSV	0x08
+#define ISER_RSV	0x04
+#define ISCSI_CTRL	0x10
+#define ISER_HELLO	0x20
+#define ISER_HELLORPLY	0x30

drivers/scsi/qla2xxx/qla_target.c

···
 	ha->tgt.tgt_ops->free_cmd(cmd);
 }
 
-/* ha->hardware_lock supposed to be held on entry */
-/* called via callback from qla2xxx */
-void qlt_ctio_completion(struct scsi_qla_host *vha, uint32_t handle)
-{
-	struct qla_hw_data *ha = vha->hw;
-	struct qla_tgt *tgt = ha->tgt.qla_tgt;
-
-	if (likely(tgt == NULL)) {
-		ql_dbg(ql_dbg_tgt, vha, 0xe021,
-		    "CTIO, but target mode not enabled"
-		    " (ha %d %p handle %#x)", vha->vp_idx, ha, handle);
-		return;
-	}
-
-	tgt->irq_cmd_count++;
-	qlt_do_ctio_completion(vha, handle, CTIO_SUCCESS, NULL);
-	tgt->irq_cmd_count--;
-}
-
 static inline int qlt_get_fcp_task_attr(struct scsi_qla_host *vha,
 	uint8_t task_codes)
 {

drivers/scsi/qla2xxx/qla_target.h

···
 extern void qlt_xmit_tm_rsp(struct qla_tgt_mgmt_cmd *);
 extern void qlt_free_mcmd(struct qla_tgt_mgmt_cmd *);
 extern void qlt_free_cmd(struct qla_tgt_cmd *cmd);
-extern void qlt_ctio_completion(struct scsi_qla_host *, uint32_t);
 extern void qlt_async_event(uint16_t, struct scsi_qla_host *, uint16_t *);
 extern void qlt_enable_vha(struct scsi_qla_host *);
 extern void qlt_vport_create(struct scsi_qla_host *, struct qla_hw_data *);

drivers/target/iscsi/Makefile

···
 				iscsi_target_util.o \
 				iscsi_target.o \
 				iscsi_target_configfs.o \
-				iscsi_target_stat.o
+				iscsi_target_stat.o \
+				iscsi_target_transport.o
 
 obj-$(CONFIG_ISCSI_TARGET)	+= iscsi_target_mod.o

drivers/target/iscsi/iscsi_target.c

···
 #include "iscsi_target_device.h"
 #include "iscsi_target_stat.h"
 
+#include <target/iscsi/iscsi_transport.h>
+
 static LIST_HEAD(g_tiqn_list);
 static LIST_HEAD(g_np_list);
 static DEFINE_SPINLOCK(tiqn_lock);
···
 struct kmem_cache *lio_r2t_cache;
 
 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
-			unsigned char *buf, u32);
-static int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
+			struct iscsi_scsi_req *, u32);
 
 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
 {
···
 	spin_unlock_bh(&np_lock);
 
 	pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
-		np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
-		"TCP" : "SCTP");
+		np->np_ip, np->np_port, np->np_transport->name);
 
 	return np;
 }
···
 	return 0;
 }
 
-static int iscsit_del_np_comm(struct iscsi_np *np)
+static void iscsit_free_np(struct iscsi_np *np)
 {
 	if (np->np_socket)
 		sock_release(np->np_socket);
-	return 0;
 }
 
 int iscsit_del_np(struct iscsi_np *np)
···
 		send_sig(SIGINT, np->np_thread, 1);
 		kthread_stop(np->np_thread);
 	}
-	iscsit_del_np_comm(np);
+
+	np->np_transport->iscsit_free_np(np);
 
 	spin_lock_bh(&np_lock);
 	list_del(&np->np_list);
 	spin_unlock_bh(&np_lock);
 
 	pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
-		np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
-		"TCP" : "SCTP");
+		np->np_ip, np->np_port, np->np_transport->name);
 
+	iscsit_put_transport(np->np_transport);
 	kfree(np);
 	return 0;
 }
+
+static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
+static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
+
+static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
+{
+	iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
+	return 0;
+}
+
+static struct iscsit_transport iscsi_target_transport = {
+	.name			= "iSCSI/TCP",
+	.transport_type		= ISCSI_TCP,
+	.owner			= NULL,
+	.iscsit_setup_np	= iscsit_setup_np,
+	.iscsit_accept_np	= iscsit_accept_np,
+	.iscsit_free_np		= iscsit_free_np,
+	.iscsit_alloc_cmd	= iscsit_alloc_cmd,
+	.iscsit_get_login_rx	= iscsit_get_login_rx,
+	.iscsit_put_login_tx	= iscsit_put_login_tx,
+	.iscsit_get_dataout	= iscsit_build_r2ts_for_cmd,
+	.iscsit_immediate_queue	= iscsit_immediate_queue,
+	.iscsit_response_queue	= iscsit_response_queue,
+	.iscsit_queue_data_in	= iscsit_queue_rsp,
+	.iscsit_queue_status	= iscsit_queue_rsp,
+};
 
 static int __init iscsi_target_init_module(void)
 {
···
 		goto ooo_out;
 	}
 
+	iscsit_register_transport(&iscsi_target_transport);
+
 	if (iscsit_load_discovery_tpg() < 0)
 		goto r2t_out;
 
···
 	iscsi_deallocate_thread_sets();
 	iscsi_thread_set_free();
 	iscsit_release_discovery_tpg();
+	iscsit_unregister_transport(&iscsi_target_transport);
 	kmem_cache_destroy(lio_cmd_cache);
 	kmem_cache_destroy(lio_qr_cache);
 	kmem_cache_destroy(lio_dr_cache);
···
 	iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 
 	ret = wait_for_completion_interruptible(&cmd->reject_comp);
+	/*
+	 * Perform the kref_put now if se_cmd has already been setup by
+	 * scsit_setup_scsi_cmd()
+	 */
+	if (cmd->se_cmd.se_tfo != NULL) {
+		pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
+		target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
+	}
 	if (ret != 0)
 		return -1;
 
 	return (!fail_conn) ? 0 : -1;
 }
+EXPORT_SYMBOL(iscsit_add_reject_from_cmd);
 
 /*
  * Map some portion of the allocated scatterlist to an iovec, suitable for
···
 
 	conn->exp_statsn = exp_statsn;
 
+	if (conn->sess->sess_ops->RDMAExtensions)
+		return;
+
 	spin_lock_bh(&conn->cmd_lock);
 	list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
 		spin_lock(&cmd->istate_lock);
···
 	return 0;
 }
 
-static int iscsit_handle_scsi_cmd(
-	struct iscsi_conn *conn,
-	unsigned char *buf)
+int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
+			  unsigned char *buf)
 {
-	int data_direction, payload_length, cmdsn_ret = 0, immed_ret;
-	struct iscsi_cmd *cmd = NULL;
+	int data_direction, payload_length;
 	struct iscsi_scsi_req *hdr;
 	int iscsi_task_attr;
 	int sam_task_attr;
···
 	    !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 		pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 				" not set. Bad iSCSI Initiator.\n");
-		return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
-				buf, conn);
+		return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
+				1, 1, buf, cmd);
 	}
 
 	if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
···
 		pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 			" set when Expected Data Transfer Length is 0 for"
 			" CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
-		return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
-				buf, conn);
+		return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
+				1, 1, buf, cmd);
 	}
 done:
 
···
 		pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
 			" MUST be set if Expected Data Transfer Length is not 0."
 			" Bad iSCSI Initiator\n");
-		return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
-				buf, conn);
+		return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
+				1, 1, buf, cmd);
 	}
 
 	if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
 	    (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
 		pr_err("Bidirectional operations not supported!\n");
-		return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
-				buf, conn);
+		return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
+				1, 1, buf, cmd);
 	}
 
 	if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
 		pr_err("Illegally set Immediate Bit in iSCSI Initiator"
 				" Scsi Command PDU.\n");
-		return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
-				buf, conn);
+		return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
+				1, 1, buf, cmd);
 	}
 
 	if (payload_length && !conn->sess->sess_ops->ImmediateData) {
 		pr_err("ImmediateData=No but DataSegmentLength=%u,"
 			" protocol error.\n", payload_length);
-		return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
-				buf, conn);
+		return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
+				1, 1, buf, cmd);
 	}
 
 	if ((be32_to_cpu(hdr->data_length )== payload_length) &&
···
 		pr_err("Expected Data Transfer Length and Length of"
 			" Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
 			" bit is not set protocol error\n");
-		return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
-				buf, conn);
+		return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
+				1, 1, buf, cmd);
 	}
 
 	if (payload_length > be32_to_cpu(hdr->data_length)) {
 		pr_err("DataSegmentLength: %u is greater than"
 			" EDTL: %u, protocol error.\n", payload_length,
 				hdr->data_length);
-		return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
-				buf, conn);
+		return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
+				1, 1, buf, cmd);
 	}
 
 	if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
 		pr_err("DataSegmentLength: %u is greater than"
 			" MaxXmitDataSegmentLength: %u, protocol error.\n",
 			payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
-		return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
-				buf, conn);
+		return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
+				1, 1, buf, cmd);
 	}
 
 	if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
 		pr_err("DataSegmentLength: %u is greater than"
 			" FirstBurstLength: %u, protocol error.\n",
 			payload_length, conn->sess->sess_ops->FirstBurstLength);
-		return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
-					buf, conn);
+		return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
+				1, 1, buf, cmd);
 	}
 
 	data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
 			 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
 			  DMA_NONE;
-
-	cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
-	if (!cmd)
-		return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
-					 buf, conn);
 
 	cmd->data_direction = data_direction;
 	iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
···
 	cmd->exp_stat_sn	= be32_to_cpu(hdr->exp_statsn);
 	cmd->first_burst_len	= payload_length;
 
-	if (cmd->data_direction == DMA_FROM_DEVICE) {
+	if (!conn->sess->sess_ops->RDMAExtensions &&
+	     cmd->data_direction == DMA_FROM_DEVICE) {
 		struct iscsi_datain_req *dr;
 
 		dr = iscsit_allocate_datain_req();
···
 
 	pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
 		" ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
-		hdr->cmdsn, hdr->data_length, payload_length, conn->cid);
+		hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
+		conn->cid);
+
+	target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
 
 	cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
 						     scsilun_to_int(&hdr->lun));
···
 	 */
 	core_alua_check_nonop_delay(&cmd->se_cmd);
 
-	if (iscsit_allocate_iovecs(cmd) < 0) {
-		return iscsit_add_reject_from_cmd(
-				ISCSI_REASON_BOOKMARK_NO_RESOURCES,
-				1, 0, buf, cmd);
-	}
+	return 0;
+}
+EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
 
+void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
+{
+	iscsit_set_dataout_sequence_values(cmd);
+
+	spin_lock_bh(&cmd->dataout_timeout_lock);
+	iscsit_start_dataout_timer(cmd, cmd->conn);
+	spin_unlock_bh(&cmd->dataout_timeout_lock);
+}
+EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
+
+int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
+			    struct iscsi_scsi_req *hdr)
+{
+	int cmdsn_ret = 0;
 	/*
 	 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
 	 * the Immediate Bit is not set, and no Immediate
···
 	 */
 	if (!cmd->immediate_data) {
 		cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
-		if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
+		if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
+			if (!cmd->sense_reason)
+				return 0;
+
+			target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
 			return 0;
-		else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
+		} else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
 			return iscsit_add_reject_from_cmd(
 				ISCSI_REASON_PROTOCOL_ERROR,
-				1, 0, buf, cmd);
+				1, 0, (unsigned char *)hdr, cmd);
+		}
 	}
 
 	iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
···
 	 * If no Immediate Data is attached, it's OK to return now.
 	 */
 	if (!cmd->immediate_data) {
-		if (!cmd->sense_reason && cmd->unsolicited_data) {
-			iscsit_set_dataout_sequence_values(cmd);
+		if (!cmd->sense_reason && cmd->unsolicited_data)
+			iscsit_set_unsoliticed_dataout(cmd);
+		if (!cmd->sense_reason)
+			return 0;
 
-			spin_lock_bh(&cmd->dataout_timeout_lock);
-			iscsit_start_dataout_timer(cmd, cmd->conn);
-			spin_unlock_bh(&cmd->dataout_timeout_lock);
-		}
-
+		target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
 		return 0;
 	}
 
 	/*
-	 * Early CHECK_CONDITIONs never make it to the transport processing
-	 * thread.  They are processed in CmdSN order by
-	 * iscsit_check_received_cmdsn() below.
+	 * Early CHECK_CONDITIONs with ImmediateData never make it to command
+	 * execution.  These exceptions are processed in CmdSN order using
+	 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
 	 */
 	if (cmd->sense_reason) {
-		immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
-		goto after_immediate_data;
+		target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
+		return 1;
 	}
 	/*
 	 * Call directly into transport_generic_new_cmd() to perform
···
 	 */
 	cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
 	if (cmd->sense_reason) {
-		immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
-		goto after_immediate_data;
+		target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
+		return 1;
 	}
 
-	immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
+	return 0;
+}
+EXPORT_SYMBOL(iscsit_process_scsi_cmd);
+
+static int
+iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
+			  bool dump_payload)
+{
+	int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
+	/*
+	 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
+	 */
+	if (dump_payload == true)
+		goto after_immediate_data;
+
+	immed_ret = iscsit_handle_immediate_data(cmd, hdr,
+					cmd->first_burst_len);
 after_immediate_data:
 	if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
 		/*
···
 		 * DataCRC, check against ExpCmdSN/MaxCmdSN if
 		 * Immediate Bit is not set.
 		 */
-		cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
-		/*
-		 * Special case for Unsupported SAM WRITE Opcodes
-		 * and ImmediateData=Yes.
-		 */
-		if (cmd->sense_reason) {
-			if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
-				return -1;
-		} else if (cmd->unsolicited_data) {
-			iscsit_set_dataout_sequence_values(cmd);
+		cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd, hdr->cmdsn);
 
-			spin_lock_bh(&cmd->dataout_timeout_lock);
-			iscsit_start_dataout_timer(cmd, cmd->conn);
-			spin_unlock_bh(&cmd->dataout_timeout_lock);
-		}
+		if (cmd->sense_reason) {
+			if (iscsit_dump_data_payload(cmd->conn,
+					cmd->first_burst_len, 1) < 0)
+				return -1;
+		} else if (cmd->unsolicited_data)
+			iscsit_set_unsoliticed_dataout(cmd);
 
 		if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
 			return iscsit_add_reject_from_cmd(
 				ISCSI_REASON_PROTOCOL_ERROR,
-				1, 0, buf, cmd);
+				1, 0, (unsigned char *)hdr, cmd);
 
 	} else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
 		/*
···
 		 * CmdSN and issue a retry to plug the sequence.
 		 */
 		cmd->i_state = ISTATE_REMOVE;
-		iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
+		iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
 	} else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
 		return -1;
 
 	return 0;
+}
+
+static int
+iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
+			   unsigned char *buf)
+{
+	struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
+	int rc, immed_data;
+	bool dump_payload = false;
+
+	rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
+	if (rc < 0)
+		return rc;
+	/*
+	 * Allocation iovecs needed for struct socket operations for
+	 * traditional iSCSI block I/O.
+	 */
+	if (iscsit_allocate_iovecs(cmd) < 0) {
+		return iscsit_add_reject_from_cmd(
+				ISCSI_REASON_BOOKMARK_NO_RESOURCES,
+				1, 0, buf, cmd);
+	}
+	immed_data = cmd->immediate_data;
+
+	rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
+	if (rc < 0)
+		return rc;
+	else if (rc > 0)
+		dump_payload = true;
+
+	if (!immed_data)
+		return 0;
+
+	return iscsit_get_immediate_data(cmd, hdr, dump_payload);
 }
 
 static u32 iscsit_do_crypto_hash_sg(
···
 	crypto_hash_final(hash, data_crc);
 }
 
-static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
+int
+iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
+			  struct iscsi_cmd **out_cmd)
 {
-	int iov_ret, ooo_cmdsn = 0, ret;
-	u8 data_crc_failed = 0;
-	u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
-	u32 rx_size = 0, payload_length;
+	struct iscsi_data *hdr = (struct iscsi_data *)buf;
 	struct iscsi_cmd *cmd = NULL;
 	struct se_cmd *se_cmd;
-	struct iscsi_data *hdr;
-	struct kvec *iov;
 	unsigned long flags;
-
-	hdr			= (struct iscsi_data *) buf;
-	payload_length		= ntoh24(hdr->dlength);
+	u32 payload_length = ntoh24(hdr->dlength);
+	int rc;
 
 	if (!payload_length) {
 		pr_err("DataOUT payload is ZERO, protocol error.\n");
···
 
 	pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
 		" DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
-		hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
+		hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
 		payload_length, conn->cid);
 
 	if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
···
 	 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
 	 * within-command recovery checks before receiving the payload.
 	 */
-	ret = iscsit_check_pre_dataout(cmd, buf);
-	if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
+	rc = iscsit_check_pre_dataout(cmd, buf);
+	if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
 		return 0;
-	else if (ret == DATAOUT_CANNOT_RECOVER)
+	else if (rc == DATAOUT_CANNOT_RECOVER)
 		return -1;
+
+	*out_cmd = cmd;
+	return 0;
+}
+EXPORT_SYMBOL(iscsit_check_dataout_hdr);
+
+static int
+iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
+		   struct iscsi_data *hdr)
+{
+	struct kvec *iov;
+	u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
+	u32 payload_length = ntoh24(hdr->dlength);
+	int iov_ret, data_crc_failed = 0;
 
 	rx_size += payload_length;
 	iov = &cmd->iov_data[0];
···
 				payload_length);
 		}
 	}
+
+	return data_crc_failed;
+}
+
+int
+iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
+			     bool data_crc_failed)
+{
+	struct iscsi_conn *conn = cmd->conn;
+	int rc, ooo_cmdsn;
 	/*
 	 * Increment post receive data and CRC values or perform
 	 * within-command recovery.
 	 */
-	ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
-	if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
+	rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
+	if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
 		return 0;
-	else if (ret == DATAOUT_SEND_R2T) {
+	else if (rc == DATAOUT_SEND_R2T) {
 		iscsit_set_dataout_sequence_values(cmd);
-		iscsit_build_r2ts_for_cmd(cmd, conn, false);
-	} else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
+		conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
+	} else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
 		/*
 		 * Handle extra special case for out of order
 		 * Unsolicited Data Out.
···
 
 	return 0;
 }
+EXPORT_SYMBOL(iscsit_check_dataout_payload);
 
-static int iscsit_handle_nop_out(
-	struct iscsi_conn *conn,
-	unsigned char *buf)
+static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
+{
+	struct iscsi_cmd *cmd;
+	struct iscsi_data *hdr = (struct iscsi_data *)buf;
+	int rc;
+	bool data_crc_failed = false;
+
+	rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
+	if (rc < 0)
+		return rc;
+	else if (!cmd)
+		return 0;
+
+	rc = iscsit_get_dataout(conn, cmd, hdr);
+	if (rc < 0)
+		return rc;
+	else if (rc > 0)
+		data_crc_failed = true;
+
+	return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
+}
+
+int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
+			unsigned char *buf)
 {
 	unsigned char *ping_data = NULL;
 	int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
 	u32 checksum, data_crc, padding = 0, payload_length;
-	struct iscsi_cmd *cmd = NULL;
+	struct iscsi_cmd *cmd_p = NULL;
 	struct kvec *iov = NULL;
 	struct iscsi_nopout *hdr;
 
···
 					buf, conn);
 	}
 
-	pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
+	pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
 		" CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
 		hdr->itt == RESERVED_ITT ? "Response" : "Request",
 		hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
···
 	 * can contain ping data.
 	 */
 	if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
-		cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
 		if (!cmd)
 			return iscsit_add_reject(
 					ISCSI_REASON_BOOKMARK_NO_RESOURCES,
···
 		/*
 		 * This was a response to a unsolicited NOPIN ping.
 		 */
-		cmd = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
-		if (!cmd)
+		cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
+		if (!cmd_p)
 			return -1;
 
 		iscsit_stop_nopin_response_timer(conn);
 
-		cmd->i_state = ISTATE_REMOVE;
-		iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
+		cmd_p->i_state = ISTATE_REMOVE;
+		iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
 		iscsit_start_nopin_timer(conn);
 	} else {
 		/*
···
 	kfree(ping_data);
 	return ret;
 }
+EXPORT_SYMBOL(iscsit_handle_nop_out);
 
-static int iscsit_handle_task_mgt_cmd(
-	struct iscsi_conn *conn,
-	unsigned char *buf)
+int
+iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
+			   unsigned char *buf)
 {
-	struct iscsi_cmd *cmd;
 	struct se_tmr_req *se_tmr;
 	struct iscsi_tmr_req *tmr_req;
 	struct iscsi_tm *hdr;
···
 		pr_err("Task Management Request TASK_REASSIGN not"
 			" issued as immediate command, bad iSCSI Initiator"
 				"implementation\n");
-		return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
-					buf, conn);
+		return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
+					1, 1, buf, cmd);
 	}
 	if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
 	    be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
 		hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
-
-	cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
-	if (!cmd)
-		return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
-					 1, buf, conn);
 
 	cmd->data_direction = DMA_NONE;
 
···
 	iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 	return 0;
 }
+EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
 
 /* #warning FIXME: Support Text Command parameters besides SendTargets */
 static int iscsit_handle_text_cmd(
···
 	return 0;
 }
 
-static int iscsit_handle_logout_cmd(
-	struct iscsi_conn *conn,
-	unsigned char *buf)
+int
+iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
+			unsigned char *buf)
 {
 	int cmdsn_ret, logout_remove = 0;
 	u8 reason_code = 0;
-	struct iscsi_cmd *cmd;
 	struct iscsi_logout *hdr;
 	struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
 
···
 	if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
 		pr_err("Received logout request on connection that"
 			" is not in logged in state, ignoring request.\n");
+		iscsit_release_cmd(cmd);
 		return 0;
 	}
-
-	cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
-	if (!cmd)
-		return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
-					buf, conn);
 
 	cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
 	cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
···
 
 	return logout_remove;
 }
+EXPORT_SYMBOL(iscsit_handle_logout_cmd);
 
 static int iscsit_handle_snack(
 	struct iscsi_conn *conn,
···
 
 static int iscsit_handle_immediate_data(
 	struct iscsi_cmd *cmd,
-	unsigned char *buf,
+	struct iscsi_scsi_req *hdr,
 	u32 length)
 {
 	int iov_ret, rx_got = 0, rx_size = 0;
···
 					" in ERL=0.\n");
 				iscsit_add_reject_from_cmd(
 						ISCSI_REASON_DATA_DIGEST_ERROR,
-						1, 0, buf, cmd);
+						1, 0, (unsigned char *)hdr, cmd);
 				return IMMEDIATE_DATA_CANNOT_RECOVER;
 			} else {
 				iscsit_add_reject_from_cmd(
 						ISCSI_REASON_DATA_DIGEST_ERROR,
-						0, 0, buf, cmd);
+						0, 0, (unsigned char *)hdr, cmd);
 				return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
 			}
 		} else {
···
 	}
 }
 
-static int iscsit_send_data_in(
-	struct iscsi_cmd *cmd,
-	struct iscsi_conn *conn)
+static void
+iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
+			struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
+			bool set_statsn)
 {
-	int iov_ret = 0, set_statsn = 0;
-	u32 iov_count = 0, tx_size = 0;
+	hdr->opcode		= ISCSI_OP_SCSI_DATA_IN;
+	hdr->flags		= datain->flags;
+	if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
+		if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
+			hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
+			hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
+		} else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
+			hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
+			hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
+		}
+	}
+	hton24(hdr->dlength, datain->length);
+	if (hdr->flags & ISCSI_FLAG_DATA_ACK)
+		int_to_scsilun(cmd->se_cmd.orig_fe_lun,
+				(struct scsi_lun *)&hdr->lun);
+	else
+		put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
+
+	hdr->itt		= cmd->init_task_tag;
+
+	if (hdr->flags & ISCSI_FLAG_DATA_ACK)
+		hdr->ttt		= cpu_to_be32(cmd->targ_xfer_tag);
+	else
+		hdr->ttt		= cpu_to_be32(0xFFFFFFFF);
+	if (set_statsn)
+		hdr->statsn		= cpu_to_be32(cmd->stat_sn);
+	else
+		hdr->statsn		= cpu_to_be32(0xFFFFFFFF);
+
+	hdr->exp_cmdsn		= cpu_to_be32(conn->sess->exp_cmd_sn);
+	hdr->max_cmdsn		= cpu_to_be32(conn->sess->max_cmd_sn);
+	hdr->datasn		= cpu_to_be32(datain->data_sn);
+	hdr->offset		= cpu_to_be32(datain->offset);
+
+	pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
+		" DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
+		cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
+		ntohl(hdr->offset), datain->length, conn->cid);
+}
+
+static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
+{
+	struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
 	struct iscsi_datain datain;
 	struct iscsi_datain_req *dr;
-	struct iscsi_data_rsp *hdr;
 	struct kvec *iov;
-	int eodr = 0;
-	int ret;
+	u32 iov_count = 0, tx_size = 0;
+	int eodr = 0, ret, iov_ret;
+	bool set_statsn = false;
 
 	memset(&datain, 0, sizeof(struct iscsi_datain));
 	dr = iscsit_get_datain_values(cmd, &datain);
···
 				cmd->init_task_tag);
 		return -1;
 	}
-
 	/*
 	 * Be paranoid and double check the logic for now.
 	 */
···
 		pr_err("Command ITT: 0x%08x, datain.offset: %u and"
 			" datain.length: %u exceeds cmd->data_length: %u\n",
 			cmd->init_task_tag, datain.offset, datain.length,
-				cmd->se_cmd.data_length);
+			cmd->se_cmd.data_length);
 		return -1;
 	}
 
···
 		    (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
 			iscsit_increment_maxcmdsn(cmd, conn->sess);
 			cmd->stat_sn = conn->stat_sn++;
-			set_statsn = 1;
+			set_statsn = true;
 		} else if (dr->dr_complete ==
-				DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
-			set_statsn = 1;
+			   DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
+			set_statsn = true;
 	}
 
-	hdr	= (struct iscsi_data_rsp *) cmd->pdu;
-	memset(hdr, 0, ISCSI_HDR_LEN);
-	hdr->opcode		= ISCSI_OP_SCSI_DATA_IN;
-	hdr->flags		= datain.flags;
-	if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
-		if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
-			hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
-			hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
-		} else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
-			hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
-			hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
-		}
-	}
-	hton24(hdr->dlength, datain.length);
-	if (hdr->flags & ISCSI_FLAG_DATA_ACK)
-		int_to_scsilun(cmd->se_cmd.orig_fe_lun,
-				(struct scsi_lun *)&hdr->lun);
-	else
-		put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
-
-	hdr->itt		= cmd->init_task_tag;
-
-	if (hdr->flags & ISCSI_FLAG_DATA_ACK)
-		hdr->ttt		= cpu_to_be32(cmd->targ_xfer_tag);
-	else
-		hdr->ttt		= cpu_to_be32(0xFFFFFFFF);
-	if (set_statsn)
-		hdr->statsn		= cpu_to_be32(cmd->stat_sn);
-	else
-		hdr->statsn		= cpu_to_be32(0xFFFFFFFF);
-
-	hdr->exp_cmdsn		= cpu_to_be32(conn->sess->exp_cmd_sn);
-	hdr->max_cmdsn		= cpu_to_be32(conn->sess->max_cmd_sn);
-	hdr->datasn		= cpu_to_be32(datain.data_sn);
-	hdr->offset		= cpu_to_be32(datain.offset);
+	iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
 
 	iov = &cmd->iov_data[0];
 	iov[iov_count].iov_base	= cmd->pdu;
···
 		u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 
 		iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
-				(unsigned char *)hdr, ISCSI_HDR_LEN,
+				(unsigned char *)cmd->pdu, ISCSI_HDR_LEN,
 				0, NULL, (u8 *)header_digest);
 
 		iov[0].iov_len += ISCSI_CRC_LEN;
···
 			" for DataIN PDU 0x%08x\n", *header_digest);
 	}
 
-	iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
+	iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
+				datain.offset, datain.length);
 	if (iov_ret < 0)
 		return -1;
 
···
 	cmd->iov_data_count = iov_count;
 	cmd->tx_size = tx_size;
 
-	pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
-		" DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
-		cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
-		ntohl(hdr->offset), datain.length, conn->cid);
-
 	/* sendpage is preferred but can't insert markers */
 	if (!conn->conn_ops->IFMarker)
 		ret = iscsit_fe_sendpage_sg(cmd, conn);
···
 	return eodr;
 }
 
-static int iscsit_send_logout_response(
-	struct iscsi_cmd *cmd,
-	struct iscsi_conn *conn)
+int
+iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
+			struct iscsi_logout_rsp *hdr)
 {
-	int niov = 0, tx_size;
 	struct iscsi_conn *logout_conn = NULL;
 	struct iscsi_conn_recovery *cr = NULL;
 	struct iscsi_session *sess = conn->sess;
-	struct kvec *iov;
-	struct iscsi_logout_rsp *hdr;
 	/*
 	 * The actual shutting down of Sessions and/or Connections
 	 * for CLOSESESSION and CLOSECONNECTION Logout Requests
···
 		return -1;
 	}
 
-	tx_size = ISCSI_HDR_LEN;
-	hdr			= (struct iscsi_logout_rsp *)cmd->pdu;
-	memset(hdr, 0, ISCSI_HDR_LEN);
 	hdr->opcode		= ISCSI_OP_LOGOUT_RSP;
 	hdr->flags		|= ISCSI_FLAG_CMD_FINAL;
 	hdr->response		= cmd->logout_response;
···
 	hdr->exp_cmdsn		= cpu_to_be32(conn->sess->exp_cmd_sn);
 	hdr->max_cmdsn		= cpu_to_be32(conn->sess->max_cmd_sn);
 
+	pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
+		" 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
+		cmd->init_task_tag, cmd->stat_sn, hdr->response,
+		cmd->logout_cid, conn->cid);
+
+	return 0;
+}
+EXPORT_SYMBOL(iscsit_build_logout_rsp);
+
+static int
+iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
+{
+	struct kvec *iov;
+	int niov = 0, tx_size, rc;
+
+	rc = iscsit_build_logout_rsp(cmd, conn,
+			(struct iscsi_logout_rsp *)&cmd->pdu[0]);
+	if (rc < 0)
+		return rc;
+
+	tx_size = ISCSI_HDR_LEN;
 	iov = &cmd->iov_misc[0];
 	iov[niov].iov_base	= cmd->pdu;
 	iov[niov++].iov_len	= ISCSI_HDR_LEN;
···
 		u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 
 		iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
-				(unsigned char *)hdr, ISCSI_HDR_LEN,
+				(unsigned char *)&cmd->pdu[0], ISCSI_HDR_LEN,
 				0, NULL, (u8 *)header_digest);
 
 		iov[0].iov_len += ISCSI_CRC_LEN;
···
 	cmd->iov_misc_count = niov;
 	cmd->tx_size = tx_size;
 
-	pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
-		" 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
-		cmd->init_task_tag, cmd->stat_sn, hdr->response,
-		cmd->logout_cid, conn->cid);
-
 	return 0;
 }
+
+void
+iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
+		       struct iscsi_nopin *hdr, bool nopout_response)
+{
+	hdr->opcode		= ISCSI_OP_NOOP_IN;
+	hdr->flags		|= ISCSI_FLAG_CMD_FINAL;
+        hton24(hdr->dlength, cmd->buf_ptr_size);
+	if (nopout_response)
+		put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
+	hdr->itt		= cmd->init_task_tag;
+	hdr->ttt		= cpu_to_be32(cmd->targ_xfer_tag);
+	cmd->stat_sn		= (nopout_response) ? conn->stat_sn++ :
+				  conn->stat_sn;
+	hdr->statsn		= cpu_to_be32(cmd->stat_sn);
+
+	if (nopout_response)
+		iscsit_increment_maxcmdsn(cmd, conn->sess);
+
+	hdr->exp_cmdsn		= cpu_to_be32(conn->sess->exp_cmd_sn);
+	hdr->max_cmdsn		= cpu_to_be32(conn->sess->max_cmd_sn);
+
+	pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
+		" StatSN: 0x%08x, Length %u\n", (nopout_response) ?
+		"Solicitied" : "Unsolicitied", cmd->init_task_tag,
+		cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
+}
+EXPORT_SYMBOL(iscsit_build_nopin_rsp);
 
 /*
  *	Unsolicited NOPIN, either requesting a response or not.
···
 	struct iscsi_conn *conn,
 	int want_response)
 {
-	int tx_size = ISCSI_HDR_LEN;
-	struct iscsi_nopin *hdr;
-	int ret;
+	struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
+	int tx_size = ISCSI_HDR_LEN, ret;
 
-	hdr			= (struct iscsi_nopin *) cmd->pdu;
-	memset(hdr, 0, ISCSI_HDR_LEN);
-	hdr->opcode		= ISCSI_OP_NOOP_IN;
-	hdr->flags		|= ISCSI_FLAG_CMD_FINAL;
-	hdr->itt		= cmd->init_task_tag;
-	hdr->ttt		= cpu_to_be32(cmd->targ_xfer_tag);
-	cmd->stat_sn		= conn->stat_sn;
-	hdr->statsn		= cpu_to_be32(cmd->stat_sn);
-	hdr->exp_cmdsn		= cpu_to_be32(conn->sess->exp_cmd_sn);
-	hdr->max_cmdsn		= cpu_to_be32(conn->sess->max_cmd_sn);
+	iscsit_build_nopin_rsp(cmd, conn, hdr, false);
 
 	if (conn->conn_ops->HeaderDigest) {
 		u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
···
 	return 0;
 }
 
-static int iscsit_send_nopin_response(
-	struct iscsi_cmd *cmd,
-	struct iscsi_conn *conn)
+static int
+iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
 {
-	int niov = 0, tx_size;
-	u32 padding = 0;
+	struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
 	struct kvec *iov;
-	struct iscsi_nopin *hdr;
+	u32 padding = 0;
+	int niov = 0, tx_size;
+
+	iscsit_build_nopin_rsp(cmd, conn, hdr, true);
 
 	tx_size = ISCSI_HDR_LEN;
-	hdr			= (struct iscsi_nopin *) cmd->pdu;
-	memset(hdr, 0, ISCSI_HDR_LEN);
-	hdr->opcode		= ISCSI_OP_NOOP_IN;
-	hdr->flags		|= ISCSI_FLAG_CMD_FINAL;
-	hton24(hdr->dlength, cmd->buf_ptr_size);
-	put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
-	hdr->itt		= cmd->init_task_tag;
-	hdr->ttt		= cpu_to_be32(cmd->targ_xfer_tag);
-	cmd->stat_sn		= conn->stat_sn++;
-	hdr->statsn		= cpu_to_be32(cmd->stat_sn);
-
-	iscsit_increment_maxcmdsn(cmd, conn->sess);
-	hdr->exp_cmdsn		= cpu_to_be32(conn->sess->exp_cmd_sn);
-	hdr->max_cmdsn		= cpu_to_be32(conn->sess->max_cmd_sn);
-
 	iov = &cmd->iov_misc[0];
 	iov[niov].iov_base	= cmd->pdu;
 	iov[niov++].iov_len	= ISCSI_HDR_LEN;
···
 
 	cmd->iov_misc_count = niov;
 	cmd->tx_size = tx_size;
-
-	pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
-		" 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
-		cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
 
 	return 0;
 }
···
  *		connection recovery.
  */
 int iscsit_build_r2ts_for_cmd(
-	struct iscsi_cmd *cmd,
 	struct iscsi_conn *conn,
+	struct iscsi_cmd *cmd,
 	bool recovery)
 {
 	int first_r2t = 1;
···
 	return 0;
 }
 
-static int iscsit_send_status(
-	struct iscsi_cmd *cmd,
-	struct iscsi_conn *conn)
+void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
+			bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
 {
-	u8 iov_count = 0, recovery;
-	u32 padding = 0, tx_size = 0;
-	struct iscsi_scsi_rsp *hdr;
-	struct kvec *iov;
-
-	recovery = (cmd->i_state != ISTATE_SEND_STATUS);
-	if (!recovery)
+	if (inc_stat_sn)
 		cmd->stat_sn = conn->stat_sn++;
 
 	spin_lock_bh(&conn->sess->session_stats_lock);
 	conn->sess->rsp_pdus++;
 	spin_unlock_bh(&conn->sess->session_stats_lock);
 
-	hdr			= (struct iscsi_scsi_rsp *) cmd->pdu;
 	memset(hdr, 0, ISCSI_HDR_LEN);
 	hdr->opcode		= ISCSI_OP_SCSI_CMD_RSP;
 	hdr->flags		|= ISCSI_FLAG_CMD_FINAL;
···
 	iscsit_increment_maxcmdsn(cmd, conn->sess);
 	hdr->exp_cmdsn		= cpu_to_be32(conn->sess->exp_cmd_sn);
 	hdr->max_cmdsn		= cpu_to_be32(conn->sess->max_cmd_sn);
+
+	pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
+		" Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
+		cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
+		cmd->se_cmd.scsi_status, conn->cid);
+}
+EXPORT_SYMBOL(iscsit_build_rsp_pdu);
+
+static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
+{
+	struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
+	struct kvec *iov;
+	u32 padding = 0, tx_size = 0;
+	int iov_count = 0;
+	bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
+
+	iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
 
 	iov = &cmd->iov_misc[0];
 	iov[iov_count].iov_base	= cmd->pdu;
···
 		u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 
 		iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
-				(unsigned char *)hdr, ISCSI_HDR_LEN,
+				(unsigned char *)cmd->pdu, ISCSI_HDR_LEN,
 				0, NULL, (u8 *)header_digest);
 
 		iov[0].iov_len += ISCSI_CRC_LEN;
···
 
 	cmd->iov_misc_count = iov_count;
 	cmd->tx_size = tx_size;
-
-	pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
-		" Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
-		(!recovery) ? "" : "Recovery ", cmd->init_task_tag,
-		cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
 
 	return 0;
 }
···
 	}
 }
 
-static int iscsit_send_task_mgt_rsp(
-	struct iscsi_cmd *cmd,
-	struct iscsi_conn *conn)
+void
+iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
+			  struct iscsi_tm_rsp *hdr)
 {
 	struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
-	struct iscsi_tm_rsp *hdr;
-	u32 tx_size = 0;
 
-	hdr			= (struct iscsi_tm_rsp *) cmd->pdu;
-	memset(hdr, 0, ISCSI_HDR_LEN);
 	hdr->opcode		= ISCSI_OP_SCSI_TMFUNC_RSP;
 	hdr->flags		= ISCSI_FLAG_CMD_FINAL;
 	hdr->response		= iscsit_convert_tcm_tmr_rsp(se_tmr);
···
 	iscsit_increment_maxcmdsn(cmd, conn->sess);
 	hdr->exp_cmdsn		= cpu_to_be32(conn->sess->exp_cmd_sn);
 	hdr->max_cmdsn		= cpu_to_be32(conn->sess->max_cmd_sn);
+
+	pr_debug("Built Task Management Response ITT: 0x%08x,"
+		" StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
+		cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
+}
+EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
+
+static int
+iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
+{
+	struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
+	u32 tx_size = 0;
+
+	iscsit_build_task_mgt_rsp(cmd, conn, hdr);
 
 	cmd->iov_misc[0].iov_base	= cmd->pdu;
 	cmd->iov_misc[0].iov_len	= ISCSI_HDR_LEN;
···
 
 	cmd->iov_misc_count = 1;
 	cmd->tx_size = tx_size;
-
-	pr_debug("Built Task Management Response ITT: 0x%08x,"
-		" StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
-		cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
 
 	return 0;
 }
···
 	return 0;
 }
 
+void
+iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
+		    struct iscsi_reject *hdr)
+{
+	hdr->opcode		= ISCSI_OP_REJECT;
+	hdr->flags		|= ISCSI_FLAG_CMD_FINAL;
+	hton24(hdr->dlength, ISCSI_HDR_LEN);
+	hdr->ffffffff		= cpu_to_be32(0xffffffff);
+	cmd->stat_sn		= conn->stat_sn++;
+	hdr->statsn		= cpu_to_be32(cmd->stat_sn);
+	hdr->exp_cmdsn		= cpu_to_be32(conn->sess->exp_cmd_sn);
+	hdr->max_cmdsn		= cpu_to_be32(conn->sess->max_cmd_sn);
+
+}
+EXPORT_SYMBOL(iscsit_build_reject);
+
 static int iscsit_send_reject(
 	struct iscsi_cmd *cmd,
 	struct iscsi_conn *conn)
···
 	struct iscsi_reject *hdr;
 	struct kvec *iov;
 
-	hdr			= (struct iscsi_reject *) cmd->pdu;
-	hdr->opcode		= ISCSI_OP_REJECT;
-	hdr->flags		|= ISCSI_FLAG_CMD_FINAL;
-	hton24(hdr->dlength, ISCSI_HDR_LEN);
-	hdr->ffffffff		= cpu_to_be32(0xffffffff);
-	cmd->stat_sn		= conn->stat_sn++;
-	hdr->statsn		= cpu_to_be32(cmd->stat_sn);
-	hdr->exp_cmdsn	= cpu_to_be32(conn->sess->exp_cmd_sn);
-	hdr->max_cmdsn	= cpu_to_be32(conn->sess->max_cmd_sn);
+	iscsit_build_reject(cmd, conn, (struct iscsi_reject *)&cmd->pdu[0]);
 
 	iov = &cmd->iov_misc[0];
-
 	iov[iov_count].iov_base = cmd->pdu;
 	iov[iov_count++].iov_len = ISCSI_HDR_LEN;
 	iov[iov_count].iov_base = cmd->buf_ptr;
···
 	set_cpus_allowed_ptr(p, conn->conn_cpumask);
 }
 
-static int handle_immediate_queue(struct iscsi_conn *conn)
+static int
+iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
 {
+	int ret;
+
+	switch (state) {
+	case ISTATE_SEND_R2T:
+		ret = iscsit_send_r2t(cmd, conn);
+		if (ret < 0)
+			goto err;
+		break;
+	case ISTATE_REMOVE:
+		spin_lock_bh(&conn->cmd_lock);
+		list_del(&cmd->i_conn_node);
+		spin_unlock_bh(&conn->cmd_lock);
+
+		iscsit_free_cmd(cmd);
+		break;
+	case ISTATE_SEND_NOPIN_WANT_RESPONSE:
+		iscsit_mod_nopin_response_timer(conn);
+		ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
+		if (ret < 0)
+			goto err;
+		break;
+	case ISTATE_SEND_NOPIN_NO_RESPONSE:
+		ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
+		if (ret < 0)
+			goto err;
+		break;
+	default:
+		pr_err("Unknown Opcode: 0x%02x ITT:"
+		       " 0x%08x, i_state: %d on CID: %hu\n",
+		       cmd->iscsi_opcode, cmd->init_task_tag, state,
+		       conn->cid);
+		goto err;
+	}
+
+	return 0;
+
+err:
+	return -1;
+}
+
+static int
+iscsit_handle_immediate_queue(struct iscsi_conn *conn)
+{
+	struct iscsit_transport *t = conn->conn_transport;
 	struct iscsi_queue_req *qr;
 	struct iscsi_cmd *cmd;
 	u8 state;
···
 		state = qr->state;
 		kmem_cache_free(lio_qr_cache, qr);
 
-		switch (state) {
-		case ISTATE_SEND_R2T:
-			ret = iscsit_send_r2t(cmd, conn);
-			if (ret < 0)
-				goto err;
-			break;
-		case ISTATE_REMOVE:
-			if (cmd->data_direction == DMA_TO_DEVICE)
-				iscsit_stop_dataout_timer(cmd);
+		ret = t->iscsit_immediate_queue(conn, cmd, state);
+		if (ret < 0)
+			return ret;
+	}
 
-			spin_lock_bh(&conn->cmd_lock);
-			list_del(&cmd->i_conn_node);
-			spin_unlock_bh(&conn->cmd_lock);
+	return 0;
+}
 
-			iscsit_free_cmd(cmd);
-			continue;
-		case ISTATE_SEND_NOPIN_WANT_RESPONSE:
-			iscsit_mod_nopin_response_timer(conn);
-			ret = iscsit_send_unsolicited_nopin(cmd,
-							    conn, 1);
-			if (ret < 0)
-				goto err;
+static int
+iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
+{
+	int ret;
+
+check_rsp_state:
+	switch (state) {
+	case ISTATE_SEND_DATAIN:
+		ret = iscsit_send_datain(cmd, conn);
+		if (ret < 0)
+			goto err;
+		else if (!ret)
+			/* more drs */
+			goto check_rsp_state;
+		else if (ret == 1) {
+			/* all done */
+			spin_lock_bh(&cmd->istate_lock);
+			cmd->i_state = ISTATE_SENT_STATUS;
+			spin_unlock_bh(&cmd->istate_lock);
+
+			if (atomic_read(&conn->check_immediate_queue))
+				return 1;
+
+			return 0;
+		} else if (ret == 2) {
+			/* Still must send status,
+			   SCF_TRANSPORT_TASK_SENSE was set */
+			spin_lock_bh(&cmd->istate_lock);
+			cmd->i_state = ISTATE_SEND_STATUS;
+			spin_unlock_bh(&cmd->istate_lock);
+			state = ISTATE_SEND_STATUS;
+			goto check_rsp_state;
+		}
+
+		break;
+	case ISTATE_SEND_STATUS:
+	case ISTATE_SEND_STATUS_RECOVERY:
+		ret = iscsit_send_response(cmd, conn);
+		break;
+	case ISTATE_SEND_LOGOUTRSP:
+		ret = iscsit_send_logout(cmd, conn);
+		break;
+	case ISTATE_SEND_ASYNCMSG:
+		ret = iscsit_send_conn_drop_async_message(
+			cmd, conn);
+		break;
+	case ISTATE_SEND_NOPIN:
+		ret = iscsit_send_nopin(cmd, conn);
+		break;
+	case ISTATE_SEND_REJECT:
+		ret = iscsit_send_reject(cmd, conn);
+		break;
+	case ISTATE_SEND_TASKMGTRSP:
+		ret = iscsit_send_task_mgt_rsp(cmd, conn);
+		if (ret != 0)
 			break;
-		case ISTATE_SEND_NOPIN_NO_RESPONSE:
-			ret = iscsit_send_unsolicited_nopin(cmd,
-							    conn, 0);
-			if (ret < 0)
-				goto err;
-			break;
-		default:
-			pr_err("Unknown Opcode: 0x%02x ITT:"
-			       " 0x%08x, i_state: %d on CID: %hu\n",
-			       cmd->iscsi_opcode, cmd->init_task_tag, state,
-			       conn->cid);
+		ret = iscsit_tmr_post_handler(cmd, conn);
+		if (ret != 0)
+			iscsit_fall_back_to_erl0(conn->sess);
+		break;
+	case ISTATE_SEND_TEXTRSP:
+		ret = iscsit_send_text_rsp(cmd, conn);
+		break;
+	default:
+		pr_err("Unknown Opcode: 0x%02x ITT:"
+		       " 0x%08x, i_state: %d on CID: %hu\n",
+		       cmd->iscsi_opcode, cmd->init_task_tag,
+		       state, conn->cid);
+		goto err;
+	}
+	if (ret < 0)
+		goto err;
+
+	if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
+		iscsit_tx_thread_wait_for_tcp(conn);
+		iscsit_unmap_iovec(cmd);
+		goto err;
+	}
+	iscsit_unmap_iovec(cmd);
+
+	switch (state) {
+	case ISTATE_SEND_LOGOUTRSP:
+		if (!iscsit_logout_post_handler(cmd, conn))
+			goto restart;
+		/* fall through */
+	case ISTATE_SEND_STATUS:
+	case ISTATE_SEND_ASYNCMSG:
+	case ISTATE_SEND_NOPIN:
+	case ISTATE_SEND_STATUS_RECOVERY:
+	case ISTATE_SEND_TEXTRSP:
+	case ISTATE_SEND_TASKMGTRSP:
+		spin_lock_bh(&cmd->istate_lock);
+		cmd->i_state = ISTATE_SENT_STATUS;
+		spin_unlock_bh(&cmd->istate_lock);
+		break;
+	case ISTATE_SEND_REJECT:
+		if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
+			cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
+			complete(&cmd->reject_comp);
 			goto err;
 		}
+		complete(&cmd->reject_comp);
+		break;
+	default:
+		pr_err("Unknown Opcode: 0x%02x ITT:"
+		       " 0x%08x, i_state: %d on CID: %hu\n",
+		       cmd->iscsi_opcode, cmd->init_task_tag,
+		       cmd->i_state, conn->cid);
+		goto err;
 	}
+
+	if (atomic_read(&conn->check_immediate_queue))
+		return 1;
 
 	return 0;
 
 err:
 	return -1;
+restart:
+	return -EAGAIN;
 }
 
-static int handle_response_queue(struct iscsi_conn *conn)
+static int iscsit_handle_response_queue(struct iscsi_conn *conn)
 {
+	struct iscsit_transport *t = conn->conn_transport;
 	struct iscsi_queue_req *qr;
 	struct iscsi_cmd *cmd;
 	u8 state;
···
 		state = qr->state;
 		kmem_cache_free(lio_qr_cache, qr);
 
-check_rsp_state:
-		switch (state) {
-		case ISTATE_SEND_DATAIN:
-			ret = iscsit_send_data_in(cmd, conn);
-			if (ret < 0)
-				goto err;
-			else if (!ret)
-				/* more drs */
-				goto check_rsp_state;
-			else if (ret == 1) {
-				/* all done */
-				spin_lock_bh(&cmd->istate_lock);
-				cmd->i_state = ISTATE_SENT_STATUS;
-				spin_unlock_bh(&cmd->istate_lock);
-
-				if (atomic_read(&conn->check_immediate_queue))
-					return 1;
-
-				continue;
-			} else if (ret == 2) {
-				/* Still must send status,
-				   SCF_TRANSPORT_TASK_SENSE was set */
-				spin_lock_bh(&cmd->istate_lock);
-				cmd->i_state = ISTATE_SEND_STATUS;
-				spin_unlock_bh(&cmd->istate_lock);
-				state = ISTATE_SEND_STATUS;
-				goto check_rsp_state;
-			}
-
-			break;
-		case ISTATE_SEND_STATUS:
-		case ISTATE_SEND_STATUS_RECOVERY:
-			ret = iscsit_send_status(cmd, conn);
-			break;
-		case ISTATE_SEND_LOGOUTRSP:
-			ret = iscsit_send_logout_response(cmd, conn);
-			break;
-		case ISTATE_SEND_ASYNCMSG:
-			ret = iscsit_send_conn_drop_async_message(
-				cmd, conn);
-			break;
-		case ISTATE_SEND_NOPIN:
-			ret = iscsit_send_nopin_response(cmd, conn);
-			break;
-		case ISTATE_SEND_REJECT:
-			ret = iscsit_send_reject(cmd, conn);
-			break;
-		case ISTATE_SEND_TASKMGTRSP:
-			ret = iscsit_send_task_mgt_rsp(cmd, conn);
-			if (ret != 0)
-				break;
-			ret = iscsit_tmr_post_handler(cmd, conn);
-			if (ret != 0)
-				iscsit_fall_back_to_erl0(conn->sess);
-			break;
-		case ISTATE_SEND_TEXTRSP:
-			ret = iscsit_send_text_rsp(cmd, conn);
-			break;
-		default:
-			pr_err("Unknown Opcode: 0x%02x ITT:"
-			       " 0x%08x, i_state: %d on CID: %hu\n",
-			       cmd->iscsi_opcode, cmd->init_task_tag,
-			       state, conn->cid);
-			goto err;
-		}
-		if (ret < 0)
-			goto err;
-
-		if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
-			iscsit_tx_thread_wait_for_tcp(conn);
-			iscsit_unmap_iovec(cmd);
-			goto err;
-		}
-		iscsit_unmap_iovec(cmd);
-
-		switch (state) {
-		case ISTATE_SEND_LOGOUTRSP:
-			if (!iscsit_logout_post_handler(cmd, conn))
-				goto restart;
-			/* fall through */
-		case ISTATE_SEND_STATUS:
-		case ISTATE_SEND_ASYNCMSG:
-		case ISTATE_SEND_NOPIN:
-		case ISTATE_SEND_STATUS_RECOVERY:
-		case ISTATE_SEND_TEXTRSP:
-		case ISTATE_SEND_TASKMGTRSP:
-			spin_lock_bh(&cmd->istate_lock);
-			cmd->i_state = ISTATE_SENT_STATUS;
-			spin_unlock_bh(&cmd->istate_lock);
-			break;
-		case ISTATE_SEND_REJECT:
-			if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
-				cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
-				complete(&cmd->reject_comp);
-				goto err;
-			}
-			complete(&cmd->reject_comp);
-			break;
-		default:
-			pr_err("Unknown Opcode: 0x%02x ITT:"
-			       " 0x%08x, i_state: %d on CID: %hu\n",
-			       cmd->iscsi_opcode, cmd->init_task_tag,
-			       cmd->i_state, conn->cid);
-			goto err;
-		}
-
-		if (atomic_read(&conn->check_immediate_queue))
-			return 1;
+		ret = t->iscsit_response_queue(conn, cmd, state);
+		if (ret == 1 || ret < 0)
+			return ret;
 	}
 
 	return 0;
-
-err:
-	return -1;
-restart:
-	return -EAGAIN;
 }
 
 int iscsi_target_tx_thread(void *arg)
···
 			goto transport_err;
 
 get_immediate:
-		ret = handle_immediate_queue(conn);
+		ret = iscsit_handle_immediate_queue(conn);
 		if (ret < 0)
 			goto transport_err;
 
-		ret = handle_response_queue(conn);
+		ret = iscsit_handle_response_queue(conn);
 		if (ret == 1)
 			goto get_immediate;
 		else if (ret == -EAGAIN)
···
 	goto restart;
 out:
 	return 0;
+}
+
+static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
+{
+	struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
+	struct iscsi_cmd *cmd;
+	int ret = 0;
+
+	switch (hdr->opcode & ISCSI_OPCODE_MASK) {
+	case ISCSI_OP_SCSI_CMD:
+		cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
+		if (!cmd)
+			return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
+						1, buf, conn);
+
+		ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
+		break;
+	case ISCSI_OP_SCSI_DATA_OUT:
+		ret = iscsit_handle_data_out(conn, buf);
+		break;
+	case ISCSI_OP_NOOP_OUT:
+		cmd = NULL;
+		if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
+			cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
+			if (!cmd)
+				return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
+						1, buf, conn);
+		}
+		ret = iscsit_handle_nop_out(conn, cmd, buf);
+		break;
+	case ISCSI_OP_SCSI_TMFUNC:
+		cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
+		if (!cmd)
+			return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
+						1, buf, conn);
+
+		ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
+		break;
+	case ISCSI_OP_TEXT:
+		ret = iscsit_handle_text_cmd(conn, buf);
+		break;
+	case ISCSI_OP_LOGOUT:
+		cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
+		if (!cmd)
+			return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
+						1, buf, conn);
+
+		ret = iscsit_handle_logout_cmd(conn, cmd, buf);
+		if (ret > 0)
+			wait_for_completion_timeout(&conn->conn_logout_comp,
+					SECONDS_FOR_LOGOUT_COMP * HZ);
+		break;
+	case ISCSI_OP_SNACK:
+		ret = iscsit_handle_snack(conn, buf);
+		break;
+	default:
+		pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
+		if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
+			pr_err("Cannot recover from unknown"
+			" opcode while ERL=0, closing iSCSI connection.\n");
+			return -1;
+		}
+		if (!conn->conn_ops->OFMarker) {
+			pr_err("Unable to recover from unknown"
+			" opcode while OFMarker=No, closing iSCSI"
+				" connection.\n");
+			return -1;
+		}
+		if (iscsit_recover_from_unknown_opcode(conn) < 0) {
+			pr_err("Unable to recover from unknown"
+				" opcode, closing iSCSI connection.\n");
+			return -1;
+		}
+		break;
+	}
+
+	return ret;
 }
 
 int iscsi_target_rx_thread(void *arg)
···
 	conn = iscsi_rx_thread_pre_handler(ts);
 	if (!conn)
 		goto out;
+
+	if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
+		struct completion comp;
+		int rc;
+
+		init_completion(&comp);
+		rc = wait_for_completion_interruptible(&comp);
+		if (rc < 0)
+			goto transport_err;
+
+		goto out;
+	}
 
 	while (!kthread_should_stop()) {
 		/*
···
 			goto transport_err;
 		}
 
-		switch (opcode) {
-		case ISCSI_OP_SCSI_CMD:
-			if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
-				goto transport_err;
-			break;
-		case ISCSI_OP_SCSI_DATA_OUT:
-			if (iscsit_handle_data_out(conn, buffer) < 0)
-				goto transport_err;
-			break;
-		case ISCSI_OP_NOOP_OUT:
-			if (iscsit_handle_nop_out(conn, buffer) < 0)
-				goto transport_err;
-			break;
-		case ISCSI_OP_SCSI_TMFUNC:
-			if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
-				goto transport_err;
-			break;
-		case ISCSI_OP_TEXT:
-			if (iscsit_handle_text_cmd(conn, buffer) < 0)
-				goto transport_err;
-			break;
-		case ISCSI_OP_LOGOUT:
-			ret = iscsit_handle_logout_cmd(conn, buffer);
-			if (ret > 0) {
-				wait_for_completion_timeout(&conn->conn_logout_comp,
-						SECONDS_FOR_LOGOUT_COMP * HZ);
-				goto transport_err;
-			} else if (ret < 0)
-				goto transport_err;
-			break;
-		case ISCSI_OP_SNACK:
-			if (iscsit_handle_snack(conn, buffer) < 0)
-				goto transport_err;
-			break;
-		default:
-			pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
-					opcode);
-			if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
-				pr_err("Cannot recover from unknown"
-				" opcode while ERL=0, closing iSCSI connection"
-				".\n");
-				goto transport_err;
-			}
-			if (!conn->conn_ops->OFMarker) {
-				pr_err("Unable to recover from unknown"
-				" opcode while OFMarker=No, closing iSCSI"
-					" connection.\n");
-				goto transport_err;
-			}
-			if (iscsit_recover_from_unknown_opcode(conn) < 0) {
-				pr_err("Unable to recover from unknown"
-					" opcode, closing iSCSI connection.\n");
-				goto transport_err;
-			}
-			break;
-		}
+		ret = iscsi_target_rx_opcode(conn, buffer);
+		if (ret < 0)
+			goto transport_err;
 	}
 
 transport_err:
···
 
 	if (conn->sock)
 		sock_release(conn->sock);
+
+	if (conn->conn_transport->iscsit_free_conn)
+		conn->conn_transport->iscsit_free_conn(conn);
+
+	iscsit_put_transport(conn->conn_transport);
+
 	conn->thread_set = NULL;
 
 	pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
···
 /*
  *	Return of 0 causes the TX thread to restart.
  */
-static int iscsit_logout_post_handler(
+int iscsit_logout_post_handler(
 	struct iscsi_cmd *cmd,
 	struct iscsi_conn *conn)
 {
···
 	}
 	return ret;
 }
+EXPORT_SYMBOL(iscsit_logout_post_handler);
 
 void iscsit_fail_session(struct iscsi_session *sess)
 {

drivers/target/iscsi/iscsi_target.h

···
 				struct iscsi_portal_group *);
 extern int iscsit_del_np(struct iscsi_np *);
 extern int iscsit_add_reject_from_cmd(u8, int, int, unsigned char *, struct iscsi_cmd *);
+extern void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *);
 extern int iscsit_logout_closesession(struct iscsi_cmd *, struct iscsi_conn *);
 extern int iscsit_logout_closeconnection(struct iscsi_cmd *, struct iscsi_conn *);
 extern int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *, struct iscsi_conn *);
 extern int iscsit_send_async_msg(struct iscsi_conn *, u16, u8, u8);
-extern int iscsit_build_r2ts_for_cmd(struct iscsi_cmd *, struct iscsi_conn *, bool recovery);
+extern int iscsit_build_r2ts_for_cmd(struct iscsi_conn *, struct iscsi_cmd *, bool recovery);
 extern void iscsit_thread_get_cpumask(struct iscsi_conn *);
 extern int iscsi_target_tx_thread(void *);
 extern int iscsi_target_rx_thread(void *);

drivers/target/iscsi/iscsi_target_auth.c

···
 	}
 }
 
-static void chap_set_random(char *data, int length)
-{
-	long r;
-	unsigned n;
-
-	while (length > 0) {
-		get_random_bytes(&r, sizeof(long));
-		r = r ^ (r >> 8);
-		r = r ^ (r >> 4);
-		n = r & 0x7;
-
-		get_random_bytes(&r, sizeof(long));
-		r = r ^ (r >> 8);
-		r = r ^ (r >> 5);
-		n = (n << 3) | (r & 0x7);
-
-		get_random_bytes(&r, sizeof(long));
-		r = r ^ (r >> 8);
-		r = r ^ (r >> 5);
-		n = (n << 2) | (r & 0x3);
-
-		*data++ = n;
-		length--;
-	}
-}
-
 static void chap_gen_challenge(
 	struct iscsi_conn *conn,
 	int caller,
···
 
 	memset(challenge_asciihex, 0, CHAP_CHALLENGE_LENGTH * 2 + 1);
 
-	chap_set_random(chap->challenge, CHAP_CHALLENGE_LENGTH);
+	get_random_bytes(chap->challenge, CHAP_CHALLENGE_LENGTH);
 	chap_binaryhex_to_asciihex(challenge_asciihex, chap->challenge,
 				CHAP_CHALLENGE_LENGTH);
 	/*

drivers/target/iscsi/iscsi_target_configfs.c

···
 #include <target/target_core_fabric_configfs.h>
 #include <target/target_core_configfs.h>
 #include <target/configfs_macros.h>
+#include <target/iscsi/iscsi_transport.h>
 
 #include "iscsi_target_core.h"
 #include "iscsi_target_parameters.h"
···
 
 TF_NP_BASE_ATTR(lio_target, sctp, S_IRUGO | S_IWUSR);
 
+static ssize_t lio_target_np_show_iser(
+	struct se_tpg_np *se_tpg_np,
+	char *page)
+{
+	struct iscsi_tpg_np *tpg_np = container_of(se_tpg_np,
+				struct iscsi_tpg_np, se_tpg_np);
+	struct iscsi_tpg_np *tpg_np_iser;
+	ssize_t rb;
+
+	tpg_np_iser = iscsit_tpg_locate_child_np(tpg_np, ISCSI_INFINIBAND);
+	if (tpg_np_iser)
+		rb = sprintf(page, "1\n");
+	else
+		rb = sprintf(page, "0\n");
+
+	return rb;
+}
+
+static ssize_t lio_target_np_store_iser(
+	struct se_tpg_np *se_tpg_np,
+	const char *page,
+	size_t count)
+{
+	struct iscsi_np *np;
+	struct iscsi_portal_group *tpg;
+	struct iscsi_tpg_np *tpg_np = container_of(se_tpg_np,
+				struct iscsi_tpg_np, se_tpg_np);
+	struct iscsi_tpg_np *tpg_np_iser = NULL;
+	char *endptr;
+	u32 op;
+	int rc;
+
+	op = simple_strtoul(page, &endptr, 0);
+	if ((op != 1) && (op != 0)) {
+		pr_err("Illegal value for tpg_enable: %u\n", op);
+		return -EINVAL;
+	}
+	np = tpg_np->tpg_np;
+	if (!np) {
+		pr_err("Unable to locate struct iscsi_np from"
+				" struct iscsi_tpg_np\n");
+		return -EINVAL;
+	}
+
+	tpg = tpg_np->tpg;
+	if (iscsit_get_tpg(tpg) < 0)
+		return -EINVAL;
+
+	if (op) {
+		int rc = request_module("ib_isert");
+		if (rc != 0)
+			pr_warn("Unable to request_module for ib_isert\n");
+
+		tpg_np_iser = iscsit_tpg_add_network_portal(tpg, &np->np_sockaddr,
+				np->np_ip, tpg_np, ISCSI_INFINIBAND);
+		if (!tpg_np_iser || IS_ERR(tpg_np_iser))
+			goto out;
+	} else {
+		tpg_np_iser = iscsit_tpg_locate_child_np(tpg_np, ISCSI_INFINIBAND);
+		if (!tpg_np_iser)
+			goto out;
+
+		rc = iscsit_tpg_del_network_portal(tpg, tpg_np_iser);
+		if (rc < 0)
+			goto out;
+	}
+
+	printk("lio_target_np_store_iser() done, op: %d\n", op);
+
+	iscsit_put_tpg(tpg);
+	return count;
+out:
+	iscsit_put_tpg(tpg);
+	return -EINVAL;
+}
+
+TF_NP_BASE_ATTR(lio_target, iser, S_IRUGO | S_IWUSR);
+
 static struct configfs_attribute *lio_target_portal_attrs[] = {
 	&lio_target_np_sctp.attr,
+	&lio_target_np_iser.attr,
 	NULL,
 };
 
···
 	struct iscsi_cmd *cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd);
 
 	cmd->i_state = ISTATE_SEND_DATAIN;
-	iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
+	cmd->conn->conn_transport->iscsit_queue_data_in(cmd->conn, cmd);
+
 	return 0;
 }
 
 static int lio_write_pending(struct se_cmd *se_cmd)
 {
 	struct iscsi_cmd *cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd);
+	struct iscsi_conn *conn = cmd->conn;
 
 	if (!cmd->immediate_data && !cmd->unsolicited_data)
-		return iscsit_build_r2ts_for_cmd(cmd, cmd->conn, false);
+		return conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
 
 	return 0;
 }
···
 	struct iscsi_cmd *cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd);
 
 	cmd->i_state = ISTATE_SEND_STATUS;
-	iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
+	cmd->conn->conn_transport->iscsit_queue_status(cmd->conn, cmd);
+
 	return 0;
 }
 
···
 	iscsit_set_default_node_attribues(acl);
 }
 
+static int lio_check_stop_free(struct se_cmd *se_cmd)
+{
+	return target_put_sess_cmd(se_cmd->se_sess, se_cmd);
+}
+
 static void lio_release_cmd(struct se_cmd *se_cmd)
 {
 	struct iscsi_cmd *cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd);
 
-	iscsit_release_cmd(cmd);
+	pr_debug("Entering lio_release_cmd for se_cmd: %p\n", se_cmd);
+	cmd->release_cmd(cmd);
 }
 
 /* End functions for target_core_fabric_ops */
···
 	fabric->tf_ops.tpg_alloc_fabric_acl = &lio_tpg_alloc_fabric_acl;
 	fabric->tf_ops.tpg_release_fabric_acl = &lio_tpg_release_fabric_acl;
 	fabric->tf_ops.tpg_get_inst_index = &lio_tpg_get_inst_index;
+	fabric->tf_ops.check_stop_free = &lio_check_stop_free,
 	fabric->tf_ops.release_cmd = &lio_release_cmd;
 	fabric->tf_ops.shutdown_session = &lio_tpg_shutdown_session;
 	fabric->tf_ops.close_session = &lio_tpg_close_session;

drivers/target/iscsi/iscsi_target_core.h

···
 
 #define ISCSI_IOV_DATA_BUFFER		5
 
-enum tpg_np_network_transport_table {
+enum iscsit_transport_type {
 	ISCSI_TCP				= 0,
 	ISCSI_SCTP_TCP				= 1,
 	ISCSI_SCTP_UDP				= 2,
···
 	u8	IFMarker;			/* [0,1] == [No,Yes] */
 	u32	OFMarkInt;			/* [1..65535] */
 	u32	IFMarkInt;			/* [1..65535] */
+	/*
+	 * iSER specific connection parameters
+	 */
+	u32	InitiatorRecvDataSegmentLength;	/* [512..2**24-1] */
+	u32	TargetRecvDataSegmentLength;	/* [512..2**24-1] */
 };
 
 struct iscsi_sess_ops {
···
 	u8	DataSequenceInOrder;		/* [0,1] == [No,Yes] */
 	u8	ErrorRecoveryLevel;		/* [0..2] */
 	u8	SessionType;			/* [0,1] == [Normal,Discovery]*/
+	/*
+	 * iSER specific session parameters
+	 */
+	u8	RDMAExtensions;			/* [0,1] == [No,Yes] */
 };
 
 struct iscsi_queue_req {
···
 };
 
 struct iscsi_param_list {
+	bool			iser;
 	struct list_head	param_list;
 	struct list_head	extra_response_list;
 };
···
 	u32			first_data_sg_off;
 	u32			kmapped_nents;
 	sense_reason_t		sense_reason;
+	void (*release_cmd)(struct iscsi_cmd *);
 }  ____cacheline_aligned;
 
 struct iscsi_tmr_req {
···
 	u16			login_port;
 	u16			local_port;
 	int			net_size;
+	int			login_family;
 	u32			auth_id;
 	u32			conn_flags;
 	/* Used for iscsi_tx_login_rsp() */
···
 	struct list_head	immed_queue_list;
 	struct list_head	response_queue_list;
 	struct iscsi_conn_ops	*conn_ops;
+	struct iscsi_login	*conn_login;
+	struct iscsit_transport *conn_transport;
 	struct iscsi_param_list	*param_list;
 	/* Used for per connection auth state machine */
 	void			*auth_protocol;
+	void			*context;
 	struct iscsi_login_thread_s *login_thread;
 	struct iscsi_portal_group *tpg;
 	/* Pointer to parent session */
···
 	u8 first_request;
 	u8 version_min;
 	u8 version_max;
+	u8 login_complete;
+	u8 login_failed;
 	char isid[6];
 	u32 cmd_sn;
 	itt_t init_task_tag;
···
 	u32 rsp_length;
 	u16 cid;
 	u16 tsih;
-	char *req;
-	char *rsp;
+	char req[ISCSI_HDR_LEN];
+	char rsp[ISCSI_HDR_LEN];
 	char *req_buf;
 	char *rsp_buf;
+	struct iscsi_conn *conn;
 } ____cacheline_aligned;
 
 struct iscsi_node_attrib {
···
 	struct task_struct	*np_thread;
 	struct timer_list	np_login_timer;
 	struct iscsi_portal_group *np_login_tpg;
+	void			*np_context;
+	struct iscsit_transport *np_transport;
 	struct list_head	np_list;
 } ____cacheline_aligned;
 

drivers/target/iscsi/iscsi_target_device.c

···
 
 	cmd->maxcmdsn_inc = 1;
 
-	mutex_lock(&sess->cmdsn_mutex);
+	if (!mutex_trylock(&sess->cmdsn_mutex)) {
+		sess->max_cmd_sn += 1;
+		pr_debug("Updated MaxCmdSN to 0x%08x\n", sess->max_cmd_sn);
+		return;
+	}
 	sess->max_cmd_sn += 1;
 	pr_debug("Updated MaxCmdSN to 0x%08x\n", sess->max_cmd_sn);
 	mutex_unlock(&sess->cmdsn_mutex);
 }
+EXPORT_SYMBOL(iscsit_increment_maxcmdsn);

drivers/target/iscsi/iscsi_target_erl1.c

···
 #include <scsi/iscsi_proto.h>
 #include <target/target_core_base.h>
 #include <target/target_core_fabric.h>
+#include <target/iscsi/iscsi_transport.h>
 
 #include "iscsi_target_core.h"
 #include "iscsi_target_seq_pdu_list.h"
···
 	int ret = DATAOUT_WITHIN_COMMAND_RECOVERY, rx_got;
 	u32 length, padding, offset = 0, size;
 	struct kvec iov;
+
+	if (conn->sess->sess_ops->RDMAExtensions)
+		return 0;
 
 	length = (buf_len > OFFLOAD_BUF_SIZE) ? OFFLOAD_BUF_SIZE : buf_len;
 
···
 int iscsit_execute_cmd(struct iscsi_cmd *cmd, int ooo)
 {
 	struct se_cmd *se_cmd = &cmd->se_cmd;
+	struct iscsi_conn *conn = cmd->conn;
 	int lr = 0;
 
 	spin_lock_bh(&cmd->istate_lock);
···
 					return 0;
 
 				iscsit_set_dataout_sequence_values(cmd);
-				iscsit_build_r2ts_for_cmd(cmd, cmd->conn, false);
+				conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
 			}
 			return 0;
 		}
···
 			if (transport_check_aborted_status(se_cmd, 1) != 0)
 				return 0;
 
-			iscsit_set_dataout_sequence_values(cmd);
-			spin_lock_bh(&cmd->dataout_timeout_lock);
-			iscsit_start_dataout_timer(cmd, cmd->conn);
-			spin_unlock_bh(&cmd->dataout_timeout_lock);
+			iscsit_set_unsoliticed_dataout(cmd);
 		}
 		return transport_handle_cdb_direct(&cmd->se_cmd);
 
···
 			cmd->init_task_tag);
 	spin_unlock_bh(&cmd->dataout_timeout_lock);
 }
+EXPORT_SYMBOL(iscsit_stop_dataout_timer);

drivers/target/iscsi/iscsi_target_login.c

···
 #include "iscsi_target.h"
 #include "iscsi_target_parameters.h"
 
-static int iscsi_login_init_conn(struct iscsi_conn *conn)
+#include <target/iscsi/iscsi_transport.h>
+
+static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn)
 {
+	struct iscsi_login *login;
+
+	login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
+	if (!login) {
+		pr_err("Unable to allocate memory for struct iscsi_login.\n");
+		return NULL;
+	}
+	login->conn = conn;
+	login->first_request = 1;
+
+	login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
+	if (!login->req_buf) {
+		pr_err("Unable to allocate memory for response buffer.\n");
+		goto out_login;
+	}
+
+	login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
+	if (!login->rsp_buf) {
+		pr_err("Unable to allocate memory for request buffer.\n");
+		goto out_req_buf;
+	}
+
+	conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
+	if (!conn->conn_ops) {
+		pr_err("Unable to allocate memory for"
+			" struct iscsi_conn_ops.\n");
+		goto out_rsp_buf;
+	}
+
 	init_waitqueue_head(&conn->queues_wq);
 	INIT_LIST_HEAD(&conn->conn_list);
 	INIT_LIST_HEAD(&conn->conn_cmd_list);
···
 
 	if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
 		pr_err("Unable to allocate conn->conn_cpumask\n");
-		return -ENOMEM;
+		goto out_conn_ops;
 	}
+	conn->conn_login = login;
 
-	return 0;
+	return login;
+
+out_conn_ops:
+	kfree(conn->conn_ops);
+out_rsp_buf:
+	kfree(login->rsp_buf);
+out_req_buf:
+	kfree(login->req_buf);
+out_login:
+	kfree(login);
+	return NULL;
 }
 
 /*
···
 	struct iscsi_node_attrib *na;
 	struct iscsi_session *sess = conn->sess;
 	unsigned char buf[32];
+	bool iser = false;
 
 	sess->tpg = conn->tpg;
 
···
 		return -1;
 	}
 
-	iscsi_set_keys_to_negotiate(0, conn->param_list);
+	if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
+		iser = true;
+
+	iscsi_set_keys_to_negotiate(conn->param_list, iser);
 
 	if (sess->sess_ops->SessionType)
 		return iscsi_set_keys_irrelevant_for_discovery(
···
 
 	if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0)
 		return -1;
+	/*
+	 * Set RDMAExtensions=Yes by default for iSER enabled network portals
+	 */
+	if (iser) {
+		struct iscsi_param *param;
+		unsigned long mrdsl, off;
+		int rc;
+
+		sprintf(buf, "RDMAExtensions=Yes");
+		if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
+			iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
+				ISCSI_LOGIN_STATUS_NO_RESOURCES);
+			return -1;
+		}
+		/*
+		 * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
+		 * Immediate Data + Unsolicitied Data-OUT if necessary..
+		 */
+		param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
+						  conn->param_list);
+		if (!param) {
+			iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
+				ISCSI_LOGIN_STATUS_NO_RESOURCES);
+			return -1;
+		}
+		rc = strict_strtoul(param->value, 0, &mrdsl);
+		if (rc < 0) {
+			iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
+				ISCSI_LOGIN_STATUS_NO_RESOURCES);
+			return -1;
+		}
+		off = mrdsl % PAGE_SIZE;
+		if (!off)
+			return 0;
+
+		if (mrdsl < PAGE_SIZE)
+			mrdsl = PAGE_SIZE;
+		else
+			mrdsl -= off;
+
+		pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
+			" to PAGE_SIZE\n", mrdsl);
+
+		sprintf(buf, "MaxRecvDataSegmentLength=%lu\n", mrdsl);
+		if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
+			iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
+				ISCSI_LOGIN_STATUS_NO_RESOURCES);
+			return -1;
+		}
+	}
 
 	return 0;
 }
···
 	struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 	struct se_session *se_sess, *se_sess_tmp;
 	struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
+	bool iser = false;
 
 	spin_lock_bh(&se_tpg->session_lock);
 	list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
···
 		return -1;
 	}
 
-	iscsi_set_keys_to_negotiate(0, conn->param_list);
+	if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
+		iser = true;
+
+	iscsi_set_keys_to_negotiate(conn->param_list, iser);
 	/*
 	 * Need to send TargetPortalGroupTag back in first login response
 	 * on any iSCSI connection where the Initiator provides TargetName.
···
 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 {
 	struct iscsi_session *sess = conn->sess;
+	/*
+	 * FIXME: Unsolicitied NopIN support for ISER
+	 */
+	if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
+		return;
 
 	if (!sess->sess_ops->SessionType)
 		iscsit_start_nopin_timer(conn);
···
 		spin_unlock_bh(&sess->conn_lock);
 
 		iscsi_post_login_start_timers(conn);
+
 		iscsi_activate_thread_set(conn, ts);
 		/*
 		 * Determine CPU mask to ensure connection's RX and TX kthreads
···
 	spin_unlock_bh(&np->np_thread_lock);
 }
 
-int iscsi_target_setup_login_socket(
+int iscsit_setup_np(
 	struct iscsi_np *np,
 	struct __kernel_sockaddr_storage *sockaddr)
 {
-	struct socket *sock;
+	struct socket *sock = NULL;
 	int backlog = 5, ret, opt = 0, len;
 
 	switch (np->np_network_transport) {
···
 		np->np_ip_proto = IPPROTO_SCTP;
 		np->np_sock_type = SOCK_SEQPACKET;
 		break;
-	case ISCSI_IWARP_TCP:
-	case ISCSI_IWARP_SCTP:
-	case ISCSI_INFINIBAND:
 	default:
 		pr_err("Unsupported network_transport: %d\n",
 				np->np_network_transport);
 		return -EINVAL;
 	}
+
+	np->np_ip_proto = IPPROTO_TCP;
+	np->np_sock_type = SOCK_STREAM;
 
 	ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 			np->np_ip_proto, &sock);
···
 	}
 
 	return 0;
-
 fail:
 	np->np_socket = NULL;
 	if (sock)
···
 	return ret;
 }
 
+int iscsi_target_setup_login_socket(
+	struct iscsi_np *np,
+	struct __kernel_sockaddr_storage *sockaddr)
+{
+	struct iscsit_transport *t;
+	int rc;
+
+	t = iscsit_get_transport(np->np_network_transport);
+	if (!t)
+		return -EINVAL;
+
+	rc = t->iscsit_setup_np(np, sockaddr);
+	if (rc < 0) {
+		iscsit_put_transport(t);
+		return rc;
+	}
+
+	np->np_transport = t;
+	printk("Set np->np_transport to %p -> %s\n", np->np_transport,
+				np->np_transport->name);
+	return 0;
+}
+
+int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
+{
+	struct socket *new_sock, *sock = np->np_socket;
+	struct sockaddr_in sock_in;
+	struct sockaddr_in6 sock_in6;
+	int rc, err;
+
+	rc = kernel_accept(sock, &new_sock, 0);
+	if (rc < 0)
+		return rc;
+
+	conn->sock = new_sock;
+	conn->login_family = np->np_sockaddr.ss_family;
+	printk("iSCSI/TCP: Setup conn->sock from new_sock: %p\n", new_sock);
+
+	if (np->np_sockaddr.ss_family == AF_INET6) {
+		memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
+
+		rc = conn->sock->ops->getname(conn->sock,
+				(struct sockaddr *)&sock_in6, &err, 1);
+		if (!rc) {
+			snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
+				&sock_in6.sin6_addr.in6_u);
+			conn->login_port = ntohs(sock_in6.sin6_port);
+		}
+
+		rc = conn->sock->ops->getname(conn->sock,
+				(struct sockaddr *)&sock_in6, &err, 0);
+		if (!rc) {
+			snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
+				&sock_in6.sin6_addr.in6_u);
+			conn->local_port = ntohs(sock_in6.sin6_port);
+		}
+	} else {
+		memset(&sock_in, 0, sizeof(struct sockaddr_in));
+
+		rc = conn->sock->ops->getname(conn->sock,
+				(struct sockaddr *)&sock_in, &err, 1);
+		if (!rc) {
+			sprintf(conn->login_ip, "%pI4",
+					&sock_in.sin_addr.s_addr);
+			conn->login_port = ntohs(sock_in.sin_port);
+		}
+
+		rc = conn->sock->ops->getname(conn->sock,
+				(struct sockaddr *)&sock_in, &err, 0);
+		if (!rc) {
+			sprintf(conn->local_ip, "%pI4",
+					&sock_in.sin_addr.s_addr);
+			conn->local_port = ntohs(sock_in.sin_port);
+		}
+	}
+
+	return 0;
+}
+
+int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
+{
+	struct iscsi_login_req *login_req;
+	u32 padding = 0, payload_length;
+
+	if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
+		return -1;
+
+	login_req = (struct iscsi_login_req *)login->req;
+	payload_length	= ntoh24(login_req->dlength);
+	padding = ((-payload_length) & 3);
+
+	pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
+		" CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
+		login_req->flags, login_req->itt, login_req->cmdsn,
+		login_req->exp_statsn, login_req->cid, payload_length);
+	/*
+	 * Setup the initial iscsi_login values from the leading
+	 * login request PDU.
+	 */
+	if (login->first_request) {
+		login_req = (struct iscsi_login_req *)login->req;
+		login->leading_connection = (!login_req->tsih) ? 1 : 0;
+		login->current_stage	= ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
+		login->version_min	= login_req->min_version;
+		login->version_max	= login_req->max_version;
+		memcpy(login->isid, login_req->isid, 6);
+		login->cmd_sn		= be32_to_cpu(login_req->cmdsn);
+		login->init_task_tag	= login_req->itt;
+		login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
+		login->cid		= be16_to_cpu(login_req->cid);
+		login->tsih		= be16_to_cpu(login_req->tsih);
+	}
+
+	if (iscsi_target_check_login_request(conn, login) < 0)
+		return -1;
+
+	memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
+	if (iscsi_login_rx_data(conn, login->req_buf,
+				payload_length + padding) < 0)
+		return -1;
+
+	return 0;
+}
+
+int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
+			u32 length)
+{
+	if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
+		return -1;
+
+	return 0;
+}
+
+static int
+iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
+{
+	int rc;
+
+	if (!t->owner) {
+		conn->conn_transport = t;
+		return 0;
+	}
+
+	rc = try_module_get(t->owner);
+	if (!rc) {
+		pr_err("try_module_get() failed for %s\n", t->name);
+		return -EINVAL;
+	}
+
+	conn->conn_transport = t;
+	return 0;
+}
+
 static int __iscsi_target_login_thread(struct iscsi_np *np)
 {
-	u8 buffer[ISCSI_HDR_LEN], iscsi_opcode, zero_tsih = 0;
-	int err, ret = 0, stop;
+	u8 *buffer, zero_tsih = 0;
+	int ret = 0, rc, stop;
 	struct iscsi_conn *conn = NULL;
 	struct iscsi_login *login;
 	struct iscsi_portal_group *tpg = NULL;
-	struct socket *new_sock, *sock;
-	struct kvec iov;
 	struct iscsi_login_req *pdu;
-	struct sockaddr_in sock_in;
-	struct sockaddr_in6 sock_in6;
 
 	flush_signals(current);
-	sock = np->np_socket;
 
 	spin_lock_bh(&np->np_thread_lock);
 	if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
···
 	}
 	spin_unlock_bh(&np->np_thread_lock);
 
-	if (kernel_accept(sock, &new_sock, 0) < 0) {
-		spin_lock_bh(&np->np_thread_lock);
-		if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
-			spin_unlock_bh(&np->np_thread_lock);
-			complete(&np->np_restart_comp);
-			/* Get another socket */
-			return 1;
-		}
-		spin_unlock_bh(&np->np_thread_lock);
-		goto out;
-	}
-	iscsi_start_login_thread_timer(np);
-
 	conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
 	if (!conn) {
 		pr_err("Could not allocate memory for"
 			" new connection\n");
-		sock_release(new_sock);
 		/* Get another socket */
 		return 1;
 	}
-
 	pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
 	conn->conn_state = TARG_CONN_STATE_FREE;
-	conn->sock = new_sock;
 
-	pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
-	conn->conn_state = TARG_CONN_STATE_XPT_UP;
+	if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
+		kfree(conn);
+		return 1;
+	}
 
-	/*
-	 * Allocate conn->conn_ops early as a failure calling
-	 * iscsit_tx_login_rsp() below will call tx_data().
-	 */
-	conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
-	if (!conn->conn_ops) {
-		pr_err("Unable to allocate memory for"
-			" struct iscsi_conn_ops.\n");
-		goto new_sess_out;
+	rc = np->np_transport->iscsit_accept_np(np, conn);
+	if (rc == -ENOSYS) {
+		complete(&np->np_restart_comp);
+		iscsit_put_transport(conn->conn_transport);
+		kfree(conn);
+		conn = NULL;
+		goto exit;
+	} else if (rc < 0) {
+		spin_lock_bh(&np->np_thread_lock);
+		if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
+			spin_unlock_bh(&np->np_thread_lock);
+			complete(&np->np_restart_comp);
+			if (ret == -ENODEV) {
+				iscsit_put_transport(conn->conn_transport);
+				kfree(conn);
+				conn = NULL;
+				goto out;
+			}
+			/* Get another socket */
+			return 1;
+		}
+		spin_unlock_bh(&np->np_thread_lock);
+		iscsit_put_transport(conn->conn_transport);
+		kfree(conn);
+		conn = NULL;
+		goto out;
 	}
 	/*
 	 * Perform the remaining iSCSI connection initialization items..
 	 */
-	if (iscsi_login_init_conn(conn) < 0)
-		goto new_sess_out;
-
-	memset(buffer, 0, ISCSI_HDR_LEN);
-	memset(&iov, 0, sizeof(struct kvec));
-	iov.iov_base	= buffer;
-	iov.iov_len	= ISCSI_HDR_LEN;
-
-	if (rx_data(conn, &iov, 1, ISCSI_HDR_LEN) <= 0) {
-		pr_err("rx_data() returned an error.\n");
+	login = iscsi_login_init_conn(conn);
+	if (!login) {
 		goto new_sess_out;
 	}
 
-	iscsi_opcode = (buffer[0] & ISCSI_OPCODE_MASK);
-	if (!(iscsi_opcode & ISCSI_OP_LOGIN)) {
-		pr_err("First opcode is not login request,"
-			" failing login request.\n");
+	iscsi_start_login_thread_timer(np);
+
+	pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
+	conn->conn_state = TARG_CONN_STATE_XPT_UP;
+	/*
+	 * This will process the first login request + payload..
+	 */
+	rc = np->np_transport->iscsit_get_login_rx(conn, login);
+	if (rc == 1)
+		return 1;
+	else if (rc < 0)
 		goto new_sess_out;
-	}
 
-	pdu			= (struct iscsi_login_req *) buffer;
-
+	buffer = &login->req[0];
+	pdu = (struct iscsi_login_req *)buffer;
 	/*
 	 * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
 	 * when Status-Class != 0.
 	*/
-	conn->login_itt		= pdu->itt;
+	conn->login_itt	= pdu->itt;
 
 	spin_lock_bh(&np->np_thread_lock);
 	if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
···
 	}
 	spin_unlock_bh(&np->np_thread_lock);
 
-	if (np->np_sockaddr.ss_family == AF_INET6) {
-		memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
-
-		if (conn->sock->ops->getname(conn->sock,
-				(struct sockaddr *)&sock_in6, &err, 1) < 0) {
-			pr_err("sock_ops->getname() failed.\n");
-			iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
-					ISCSI_LOGIN_STATUS_TARGET_ERROR);
-			goto new_sess_out;
-		}
-		snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
-				&sock_in6.sin6_addr.in6_u);
-		conn->login_port = ntohs(sock_in6.sin6_port);
-
-		if (conn->sock->ops->getname(conn->sock,
-				(struct sockaddr *)&sock_in6, &err, 0) < 0) {
-			pr_err("sock_ops->getname() failed.\n");
-			iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
-					ISCSI_LOGIN_STATUS_TARGET_ERROR);
-			goto new_sess_out;
-		}
-		snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
-				&sock_in6.sin6_addr.in6_u);
-		conn->local_port = ntohs(sock_in6.sin6_port);
-
-	} else {
-		memset(&sock_in, 0, sizeof(struct sockaddr_in));
-
-		if (conn->sock->ops->getname(conn->sock,
-				(struct sockaddr *)&sock_in, &err, 1) < 0) {
-			pr_err("sock_ops->getname() failed.\n");
-			iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
-					ISCSI_LOGIN_STATUS_TARGET_ERROR);
-			goto new_sess_out;
-		}
-		sprintf(conn->login_ip, "%pI4", &sock_in.sin_addr.s_addr);
-		conn->login_port = ntohs(sock_in.sin_port);
-
-		if (conn->sock->ops->getname(conn->sock,
-				(struct sockaddr *)&sock_in, &err, 0) < 0) {
-			pr_err("sock_ops->getname() failed.\n");
-			iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
-					ISCSI_LOGIN_STATUS_TARGET_ERROR);
-			goto new_sess_out;
-		}
-		sprintf(conn->local_ip, "%pI4", &sock_in.sin_addr.s_addr);
-		conn->local_port = ntohs(sock_in.sin_port);
-	}
-
 	conn->network_transport = np->np_network_transport;
 
 	pr_debug("Received iSCSI login request from %s on %s Network"
-			" Portal %s:%hu\n", conn->login_ip,
-		(conn->network_transport == ISCSI_TCP) ? "TCP" : "SCTP",
-			conn->local_ip, conn->local_port);
+		" Portal %s:%hu\n", conn->login_ip, np->np_transport->name,
+		conn->local_ip, conn->local_port);
 
 	pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
 	conn->conn_state	= TARG_CONN_STATE_IN_LOGIN;
···
 		if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
 			goto new_sess_out;
 	}
-
 	/*
-	 * This will process the first login request, and call
-	 * iscsi_target_locate_portal(), and return a valid struct iscsi_login.
+	 * SessionType: Discovery
+	 *
+	 * 	Locates Default Portal
+	 *
+	 * SessionType: Normal
+	 *
+	 * 	Locates Target Portal from NP -> Target IQN
 	 */
-	login = iscsi_target_init_negotiation(np, conn, buffer);
-	if (!login) {
+	rc = iscsi_target_locate_portal(np, conn, login);
+	if (rc < 0) {
 		tpg = conn->tpg;
 		goto new_sess_out;
 	}
···
 	}
 
 	if (zero_tsih) {
-		if (iscsi_login_zero_tsih_s2(conn) < 0) {
-			iscsi_target_nego_release(login, conn);
+		if (iscsi_login_zero_tsih_s2(conn) < 0)
 			goto new_sess_out;
-		}
 	} else {
-		if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0) {
-			iscsi_target_nego_release(login, conn);
+		if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
 			goto old_sess_out;
-		}
 	}
 
 	if (iscsi_target_start_negotiation(login, conn) < 0)
···
 		iscsi_release_param_list(conn->param_list);
 		conn->param_list = NULL;
 	}
-	if (conn->sock)
+	iscsi_target_nego_release(conn);
+
+	if (conn->sock) {
 		sock_release(conn->sock);
+		conn->sock = NULL;
+	}
+
+	if (conn->conn_transport->iscsit_free_conn)
+		conn->conn_transport->iscsit_free_conn(conn);
+
+	iscsit_put_transport(conn->conn_transport);
+
 	kfree(conn);
 
 	if (tpg) {
···
 	/* Wait for another socket.. */
 	if (!stop)
 		return 1;
-
+exit:
 	iscsi_stop_login_thread_timer(np);
 	spin_lock_bh(&np->np_thread_lock);
 	np->np_thread_state = ISCSI_NP_THREAD_EXIT;
+	np->np_thread = NULL;
 	spin_unlock_bh(&np->np_thread_lock);
+
 	return 0;
 }
 

drivers/target/iscsi/iscsi_target_login.h

···
 extern int iscsi_login_setup_crypto(struct iscsi_conn *);
 extern int iscsi_check_for_session_reinstatement(struct iscsi_conn *);
 extern int iscsi_login_post_auth_non_zero_tsih(struct iscsi_conn *, u16, u32);
+extern int iscsit_setup_np(struct iscsi_np *,
+				struct __kernel_sockaddr_storage *);
 extern int iscsi_target_setup_login_socket(struct iscsi_np *,
 				struct __kernel_sockaddr_storage *);
+extern int iscsit_accept_np(struct iscsi_np *, struct iscsi_conn *);
+extern int iscsit_get_login_rx(struct iscsi_conn *, struct iscsi_login *);
+extern int iscsit_put_login_tx(struct iscsi_conn *, struct iscsi_login *, u32);
+extern void iscsit_free_conn(struct iscsi_np *, struct iscsi_conn *);
 extern int iscsi_target_login_thread(void *);
 extern int iscsi_login_disable_FIM_keys(struct iscsi_param_list *, struct iscsi_conn *);
 

drivers/target/iscsi/iscsi_target_nego.c

···
 #include <scsi/iscsi_proto.h>
 #include <target/target_core_base.h>
 #include <target/target_core_fabric.h>
+#include <target/iscsi/iscsi_transport.h>
 
 #include "iscsi_target_core.h"
 #include "iscsi_target_parameters.h"
···
 	kfree(conn->auth_protocol);
 }
 
-static int iscsi_target_check_login_request(
+int iscsi_target_check_login_request(
 	struct iscsi_conn *conn,
 	struct iscsi_login *login)
 {
···
 		return -1;
 	}
 
-	req_csg = (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2;
-	req_nsg = (login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK);
+	req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
+	req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags);
 
 	if (req_csg != login->current_stage) {
 		pr_err("Initiator unexpectedly changed login stage"
···
 
 	padding = ((-login->rsp_length) & 3);
 
-	if (iscsi_login_tx_data(
-			conn,
-			login->rsp,
-			login->rsp_buf,
-			login->rsp_length + padding) < 0)
+	if (conn->conn_transport->iscsit_put_login_tx(conn, login,
+					login->rsp_length + padding) < 0)
 		return -1;
 
 	login->rsp_length		= 0;
···
 	return 0;
 }
 
-static int iscsi_target_do_rx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
-{
-	u32 padding = 0, payload_length;
-	struct iscsi_login_req *login_req;
-
-	if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
-		return -1;
-
-	login_req = (struct iscsi_login_req *) login->req;
-	payload_length			= ntoh24(login_req->dlength);
-
-	pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
-		" CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
-		 login_req->flags, login_req->itt, login_req->cmdsn,
-		 login_req->exp_statsn, login_req->cid, payload_length);
-
-	if (iscsi_target_check_login_request(conn, login) < 0)
-		return -1;
-
-	padding = ((-payload_length) & 3);
-	memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
-
-	if (iscsi_login_rx_data(
-			conn,
-			login->req_buf,
-			payload_length + padding) < 0)
-		return -1;
-
-	return 0;
-}
-
 static int iscsi_target_do_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
 {
 	if (iscsi_target_do_tx_login_io(conn, login) < 0)
 		return -1;
 
-	if (iscsi_target_do_rx_login_io(conn, login) < 0)
-		return -1;
-
-	return 0;
-}
-
-static int iscsi_target_get_initial_payload(
-	struct iscsi_conn *conn,
-	struct iscsi_login *login)
-{
-	u32 padding = 0, payload_length;
-	struct iscsi_login_req *login_req;
-
-	login_req = (struct iscsi_login_req *) login->req;
-	payload_length = ntoh24(login_req->dlength);
-
-	pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
-		" CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
-		login_req->flags, login_req->itt, login_req->cmdsn,
-		login_req->exp_statsn, payload_length);
-
-	if (iscsi_target_check_login_request(conn, login) < 0)
-		return -1;
-
-	padding = ((-payload_length) & 3);
-
-	if (iscsi_login_rx_data(
-			conn,
-			login->req_buf,
-			payload_length + padding) < 0)
+	if (conn->conn_transport->iscsit_get_login_rx(conn, login) < 0)
 		return -1;
 
 	return 0;
···
 			return -1;
 		}
 
-		switch ((login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2) {
+		switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
 		case 0:
-			login_rsp->flags |= (0 & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK);
+			login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
 			if (iscsi_target_handle_csg_zero(conn, login) < 0)
 				return -1;
 			break;
···
 				return -1;
 			if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
 				login->tsih = conn->sess->tsih;
+				login->login_complete = 1;
 				if (iscsi_target_do_tx_login_io(conn,
 						login) < 0)
 					return -1;
···
 		default:
 			pr_err("Illegal CSG: %d received from"
 				" Initiator, protocol error.\n",
-				(login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
-				>> 2);
+				ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
 			break;
 		}
 
···
 /*
  * Processes the first Login Request..
  */
-static int iscsi_target_locate_portal(
+int iscsi_target_locate_portal(
 	struct iscsi_np *np,
 	struct iscsi_conn *conn,
 	struct iscsi_login *login)
···
 
 	login_req = (struct iscsi_login_req *) login->req;
 	payload_length = ntoh24(login_req->dlength);
-
-	login->first_request	= 1;
-	login->leading_connection = (!login_req->tsih) ? 1 : 0;
-	login->current_stage	=
-		(login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2;
-	login->version_min	= login_req->min_version;
-	login->version_max	= login_req->max_version;
-	memcpy(login->isid, login_req->isid, 6);
-	login->cmd_sn		= be32_to_cpu(login_req->cmdsn);
-	login->init_task_tag	= login_req->itt;
-	login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
-	login->cid		= be16_to_cpu(login_req->cid);
-	login->tsih		= be16_to_cpu(login_req->tsih);
-
-	if (iscsi_target_get_initial_payload(conn, login) < 0)
-		return -1;
 
 	tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
 	if (!tmpbuf) {
···
 
 		start += strlen(key) + strlen(value) + 2;
 	}
+
+	printk("i_buf: %s, s_buf: %s, t_buf: %s\n", i_buf, s_buf, t_buf);
 
 	/*
 	 * See 5.3.  Login Phase.
···
 	return ret;
 }
 
-struct iscsi_login *iscsi_target_init_negotiation(
-	struct iscsi_np *np,
-	struct iscsi_conn *conn,
-	char *login_pdu)
-{
-	struct iscsi_login *login;
-
-	login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
-	if (!login) {
-		pr_err("Unable to allocate memory for struct iscsi_login.\n");
-		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
-				ISCSI_LOGIN_STATUS_NO_RESOURCES);
-		return NULL;
-	}
-
-	login->req = kmemdup(login_pdu, ISCSI_HDR_LEN, GFP_KERNEL);
-	if (!login->req) {
-		pr_err("Unable to allocate memory for Login Request.\n");
-		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
-				ISCSI_LOGIN_STATUS_NO_RESOURCES);
-		goto out;
-	}
-
-	login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
-	if (!login->req_buf) {
-		pr_err("Unable to allocate memory for response buffer.\n");
-		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
-				ISCSI_LOGIN_STATUS_NO_RESOURCES);
-		goto out;
-	}
-	/*
-	 * SessionType: Discovery
-	 *
-	 *	Locates Default Portal
-	 *
-	 * SessionType: Normal
-	 *
-	 *	Locates Target Portal from NP -> Target IQN
-	 */
-	if (iscsi_target_locate_portal(np, conn, login) < 0) {
-		goto out;
-	}
-
-	return login;
-out:
-	kfree(login->req);
-	kfree(login->req_buf);
-	kfree(login);
-
-	return NULL;
-}
-
 int iscsi_target_start_negotiation(
 	struct iscsi_login *login,
 	struct iscsi_conn *conn)
 {
-	int ret = -1;
-
-	login->rsp = kzalloc(ISCSI_HDR_LEN, GFP_KERNEL);
-	if (!login->rsp) {
-		pr_err("Unable to allocate memory for"
-				" Login Response.\n");
-		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
-				ISCSI_LOGIN_STATUS_NO_RESOURCES);
-		ret = -1;
-		goto out;
-	}
-
-	login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
-	if (!login->rsp_buf) {
-		pr_err("Unable to allocate memory for"
-			" request buffer.\n");
-		iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
-				ISCSI_LOGIN_STATUS_NO_RESOURCES);
-		ret = -1;
-		goto out;
-	}
+	int ret;
 
 	ret = iscsi_target_do_login(conn, login);
-out:
 	if (ret != 0)
 		iscsi_remove_failed_auth_entry(conn);
 
-	iscsi_target_nego_release(login, conn);
+	iscsi_target_nego_release(conn);
 	return ret;
 }
 
-void iscsi_target_nego_release(
-	struct iscsi_login *login,
-	struct iscsi_conn *conn)
+void iscsi_target_nego_release(struct iscsi_conn *conn)
 {
-	kfree(login->req);
-	kfree(login->rsp);
+	struct iscsi_login *login = conn->conn_login;
+
+	if (!login)
+		return;
+
 	kfree(login->req_buf);
 	kfree(login->rsp_buf);
 	kfree(login);
+
+	conn->conn_login = NULL;
 }

drivers/target/iscsi/iscsi_target_nego.h

···
 extern void convert_null_to_semi(char *, int);
 extern int extract_param(const char *, const char *, unsigned int, char *,
 		unsigned char *);
-extern struct iscsi_login *iscsi_target_init_negotiation(
-		struct iscsi_np *, struct iscsi_conn *, char *);
+extern int iscsi_target_check_login_request(struct iscsi_conn *,
+		struct iscsi_login *);
+extern int iscsi_target_get_initial_payload(struct iscsi_conn *,
+		struct iscsi_login *);
+extern int iscsi_target_locate_portal(struct iscsi_np *, struct iscsi_conn *,
+		struct iscsi_login *);
 extern int iscsi_target_start_negotiation(
 		struct iscsi_login *, struct iscsi_conn *);
-extern void iscsi_target_nego_release(
-		struct iscsi_login *, struct iscsi_conn *);
+extern void iscsi_target_nego_release(struct iscsi_conn *);
 
 #endif /* ISCSI_TARGET_NEGO_H */

drivers/target/iscsi/iscsi_target_parameters.c

···
 	char *text_buf,
 	int text_length)
 {
-	int length, tx_sent;
+	int length, tx_sent, iov_cnt = 1;
 	struct kvec iov[2];
 
 	length = (ISCSI_HDR_LEN + text_length);
···
 	memset(&iov[0], 0, 2 * sizeof(struct kvec));
 	iov[0].iov_len		= ISCSI_HDR_LEN;
 	iov[0].iov_base		= pdu_buf;
-	iov[1].iov_len		= text_length;
-	iov[1].iov_base		= text_buf;
+
+	if (text_buf && text_length) {
+		iov[1].iov_len	= text_length;
+		iov[1].iov_base	= text_buf;
+		iov_cnt++;
+	}
 
 	/*
 	 * Initial Marker-less Interval.
···
 	 */
 	conn->if_marker += length;
 
-	tx_sent = tx_data(conn, &iov[0], 2, length);
+	tx_sent = tx_data(conn, &iov[0], iov_cnt, length);
 	if (tx_sent != length) {
 		pr_err("tx_data returned %d, expecting %d.\n",
 				tx_sent, length);
···
 			TYPERANGE_MARKINT, USE_INITIAL_ONLY);
 	if (!param)
 		goto out;
+	/*
+	 * Extra parameters for ISER from RFC-5046
+	 */
+	param = iscsi_set_default_param(pl, RDMAEXTENTIONS, INITIAL_RDMAEXTENTIONS,
+			PHASE_OPERATIONAL, SCOPE_SESSION_WIDE, SENDER_BOTH,
+			TYPERANGE_BOOL_AND, USE_LEADING_ONLY);
+	if (!param)
+		goto out;
+
+	param = iscsi_set_default_param(pl, INITIATORRECVDATASEGMENTLENGTH,
+			INITIAL_INITIATORRECVDATASEGMENTLENGTH,
+			PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
+			TYPERANGE_512_TO_16777215, USE_ALL);
+	if (!param)
+		goto out;
+
+	param = iscsi_set_default_param(pl, TARGETRECVDATASEGMENTLENGTH,
+			INITIAL_TARGETRECVDATASEGMENTLENGTH,
+			PHASE_OPERATIONAL, SCOPE_CONNECTION_ONLY, SENDER_BOTH,
+			TYPERANGE_512_TO_16777215, USE_ALL);
+	if (!param)
+		goto out;
 
 	*param_list_ptr = pl;
 	return 0;
···
 }
 
 int iscsi_set_keys_to_negotiate(
-	int sessiontype,
-	struct iscsi_param_list *param_list)
+	struct iscsi_param_list *param_list,
+	bool iser)
 {
 	struct iscsi_param *param;
+
+	param_list->iser = iser;
 
 	list_for_each_entry(param, &param_list->param_list, p_list) {
 		param->state = 0;
 		if (!strcmp(param->name, AUTHMETHOD)) {
 			SET_PSTATE_NEGOTIATE(param);
 		} else if (!strcmp(param->name, HEADERDIGEST)) {
-			SET_PSTATE_NEGOTIATE(param);
+			if (iser == false)
+				SET_PSTATE_NEGOTIATE(param);
 		} else if (!strcmp(param->name, DATADIGEST)) {
-			SET_PSTATE_NEGOTIATE(param);
+			if (iser == false)
+				SET_PSTATE_NEGOTIATE(param);
 		} else if (!strcmp(param->name, MAXCONNECTIONS)) {
 			SET_PSTATE_NEGOTIATE(param);
 		} else if (!strcmp(param->name, TARGETNAME)) {
···
 		} else if (!strcmp(param->name, IMMEDIATEDATA)) {
 			SET_PSTATE_NEGOTIATE(param);
 		} else if (!strcmp(param->name, MAXRECVDATASEGMENTLENGTH)) {
-			SET_PSTATE_NEGOTIATE(param);
+			if (iser == false)
+				SET_PSTATE_NEGOTIATE(param);
 		} else if (!strcmp(param->name, MAXXMITDATASEGMENTLENGTH)) {
 			continue;
 		} else if (!strcmp(param->name, MAXBURSTLENGTH)) {
···
 			SET_PSTATE_NEGOTIATE(param);
 		} else if (!strcmp(param->name, OFMARKINT)) {
 			SET_PSTATE_NEGOTIATE(param);
+		} else if (!strcmp(param->name, RDMAEXTENTIONS)) {
+			if (iser == true)
+				SET_PSTATE_NEGOTIATE(param);
+		} else if (!strcmp(param->name, INITIATORRECVDATASEGMENTLENGTH)) {
+			if (iser == true)
+				SET_PSTATE_NEGOTIATE(param);
+		} else if (!strcmp(param->name, TARGETRECVDATASEGMENTLENGTH)) {
+			if (iser == true)
+				SET_PSTATE_NEGOTIATE(param);
 		}
 	}
 
···
 		else if (!strcmp(param->name, IFMARKINT))
 			param->state &= ~PSTATE_NEGOTIATE;
 		else if (!strcmp(param->name, OFMARKINT))
+			param->state &= ~PSTATE_NEGOTIATE;
+		else if (!strcmp(param->name, RDMAEXTENTIONS))
+			param->state &= ~PSTATE_NEGOTIATE;
+		else if (!strcmp(param->name, INITIATORRECVDATASEGMENTLENGTH))
+			param->state &= ~PSTATE_NEGOTIATE;
+		else if (!strcmp(param->name, TARGETRECVDATASEGMENTLENGTH))
 			param->state &= ~PSTATE_NEGOTIATE;
 	}
 
···
 		 * this key is not sent over the wire.
 		 */
 		if (!strcmp(param->name, MAXXMITDATASEGMENTLENGTH)) {
+			if (param_list->iser == true)
+				continue;
+
 			ops->MaxXmitDataSegmentLength =
 				simple_strtoul(param->value, &tmpptr, 0);
 			pr_debug("MaxXmitDataSegmentLength:     %s\n",
···
 				simple_strtoul(param->value, &tmpptr, 0);
 			pr_debug("IFMarkInt:                    %s\n",
 				param->value);
+		} else if (!strcmp(param->name, INITIATORRECVDATASEGMENTLENGTH)) {
+			ops->InitiatorRecvDataSegmentLength =
+				simple_strtoul(param->value, &tmpptr, 0);
+			pr_debug("InitiatorRecvDataSegmentLength: %s\n",
+				param->value);
+			ops->MaxRecvDataSegmentLength =
+					ops->InitiatorRecvDataSegmentLength;
+			pr_debug("Set MRDSL from InitiatorRecvDataSegmentLength\n");
+		} else if (!strcmp(param->name, TARGETRECVDATASEGMENTLENGTH)) {
+			ops->TargetRecvDataSegmentLength =
+				simple_strtoul(param->value, &tmpptr, 0);
+			pr_debug("TargetRecvDataSegmentLength:  %s\n",
+				param->value);
+			ops->MaxXmitDataSegmentLength =
+					ops->TargetRecvDataSegmentLength;
+			pr_debug("Set MXDSL from TargetRecvDataSegmentLength\n");
 		}
 	}
 	pr_debug("----------------------------------------------------"
···
 		} else if (!strcmp(param->name, SESSIONTYPE)) {
 			ops->SessionType = !strcmp(param->value, DISCOVERY);
 			pr_debug("SessionType:                  %s\n",
+				param->value);
+		} else if (!strcmp(param->name, RDMAEXTENTIONS)) {
+			ops->RDMAExtensions = !strcmp(param->value, YES);
+			pr_debug("RDMAExtensions:               %s\n",
 				param->value);
 		}
 	}

drivers/target/iscsi/iscsi_target_parameters.h

···
 extern void iscsi_dump_sess_ops(struct iscsi_sess_ops *);
 extern void iscsi_print_params(struct iscsi_param_list *);
 extern int iscsi_create_default_params(struct iscsi_param_list **);
-extern int iscsi_set_keys_to_negotiate(int, struct iscsi_param_list *);
+extern int iscsi_set_keys_to_negotiate(struct iscsi_param_list *, bool);
 extern int iscsi_set_keys_irrelevant_for_discovery(struct iscsi_param_list *);
 extern int iscsi_copy_param_list(struct iscsi_param_list **,
 			struct iscsi_param_list *, int);
···
 #define X_EXTENSIONKEY_CISCO_OLD	"X-com.cisco.iscsi.draft"
 
 /*
+ * Parameter names of iSCSI Extentions for RDMA (iSER).  See RFC-5046
+ */
+#define RDMAEXTENTIONS			"RDMAExtensions"
+#define INITIATORRECVDATASEGMENTLENGTH	"InitiatorRecvDataSegmentLength"
+#define TARGETRECVDATASEGMENTLENGTH	"TargetRecvDataSegmentLength"
+
+/*
  * For AuthMethod.
  */
 #define KRB5				"KRB5"
···
 #define INITIAL_OFMARKER			NO
 #define INITIAL_IFMARKINT			"2048~65535"
 #define INITIAL_OFMARKINT			"2048~65535"
+
+/*
+ * Initial values for iSER parameters following RFC-5046 Section 6
+ */
+#define INITIAL_RDMAEXTENTIONS			NO
+#define INITIAL_INITIATORRECVDATASEGMENTLENGTH	"262144"
+#define INITIAL_TARGETRECVDATASEGMENTLENGTH	"8192"
 
 /*
  * For [Header,Data]Digests.

drivers/target/iscsi/iscsi_target_tmr.c

···
 #include <scsi/iscsi_proto.h>
 #include <target/target_core_base.h>
 #include <target/target_core_fabric.h>
+#include <target/iscsi/iscsi_transport.h>
 
 #include "iscsi_target_core.h"
 #include "iscsi_target_seq_pdu_list.h"
···
 	/*
 	 * iscsit_build_r2ts_for_cmd() can handle the rest from here.
 	 */
-	return iscsit_build_r2ts_for_cmd(cmd, conn, true);
+	return conn->conn_transport->iscsit_get_dataout(conn, cmd, true);
 }
 
 static int iscsit_task_reassign_complete_read(
···
 
 	return 0;
 }
+EXPORT_SYMBOL(iscsit_tmr_post_handler);
 
 /*
  *	Nothing to do here, but leave it for good measure. :-)

drivers/target/iscsi/iscsi_target_tpg.c

···
 #include "iscsi_target.h"
 #include "iscsi_target_parameters.h"
 
+#include <target/iscsi/iscsi_transport.h>
+
 struct iscsi_portal_group *iscsit_alloc_portal_group(struct iscsi_tiqn *tiqn, u16 tpgt)
 {
 	struct iscsi_portal_group *tpg;
···
 
 	pr_debug("CORE[%s] - Added Network Portal: %s:%hu,%hu on %s\n",
 		tpg->tpg_tiqn->tiqn, np->np_ip, np->np_port, tpg->tpgt,
-		(np->np_network_transport == ISCSI_TCP) ? "TCP" : "SCTP");
+		np->np_transport->name);
 
 	return tpg_np;
 }
···
 
 	pr_debug("CORE[%s] - Removed Network Portal: %s:%hu,%hu on %s\n",
 		tpg->tpg_tiqn->tiqn, np->np_ip, np->np_port, tpg->tpgt,
-		(np->np_network_transport == ISCSI_TCP) ? "TCP" : "SCTP");
+		np->np_transport->name);
 
 	tpg_np->tpg_np = NULL;
 	tpg_np->tpg = NULL;

drivers/target/iscsi/iscsi_target_transport.c

···
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <target/iscsi/iscsi_transport.h>
+
+static LIST_HEAD(g_transport_list);
+static DEFINE_MUTEX(transport_mutex);
+
+struct iscsit_transport *iscsit_get_transport(int type)
+{
+	struct iscsit_transport *t;
+
+	mutex_lock(&transport_mutex);
+	list_for_each_entry(t, &g_transport_list, t_node) {
+		if (t->transport_type == type) {
+			if (t->owner && !try_module_get(t->owner)) {
+				t = NULL;
+			}
+			mutex_unlock(&transport_mutex);
+			return t;
+		}
+	}
+	mutex_unlock(&transport_mutex);
+
+	return NULL;
+}
+
+void iscsit_put_transport(struct iscsit_transport *t)
+{
+	if (t->owner)
+		module_put(t->owner);
+}
+
+int iscsit_register_transport(struct iscsit_transport *t)
+{
+	INIT_LIST_HEAD(&t->t_node);
+
+	mutex_lock(&transport_mutex);
+	list_add_tail(&t->t_node, &g_transport_list);
+	mutex_unlock(&transport_mutex);
+
+	pr_debug("Registered iSCSI transport: %s\n", t->name);
+
+	return 0;
+}
+EXPORT_SYMBOL(iscsit_register_transport);
+
+void iscsit_unregister_transport(struct iscsit_transport *t)
+{
+	mutex_lock(&transport_mutex);
+	list_del(&t->t_node);
+	mutex_unlock(&transport_mutex);
+
+	pr_debug("Unregistered iSCSI transport: %s\n", t->name);
+}
+EXPORT_SYMBOL(iscsit_unregister_transport);

drivers/target/iscsi/iscsi_target_util.c

···
 #include <target/target_core_base.h>
 #include <target/target_core_fabric.h>
 #include <target/target_core_configfs.h>
+#include <target/iscsi/iscsi_transport.h>
 
 #include "iscsi_target_core.h"
 #include "iscsi_target_parameters.h"
···
 	spin_unlock_bh(&cmd->r2t_lock);
 }
 
+struct iscsi_cmd *iscsit_alloc_cmd(struct iscsi_conn *conn, gfp_t gfp_mask)
+{
+	struct iscsi_cmd *cmd;
+
+	cmd = kmem_cache_zalloc(lio_cmd_cache, gfp_mask);
+	if (!cmd)
+		return NULL;
+
+	cmd->release_cmd = &iscsit_release_cmd;
+	return cmd;
+}
+
 /*
  * May be called from software interrupt (timer) context for allocating
  * iSCSI NopINs.
···
 {
 	struct iscsi_cmd *cmd;
 
-	cmd = kmem_cache_zalloc(lio_cmd_cache, gfp_mask);
+	cmd = conn->conn_transport->iscsit_alloc_cmd(conn, gfp_mask);
 	if (!cmd) {
 		pr_err("Unable to allocate memory for struct iscsi_cmd.\n");
 		return NULL;
 	}
-
-	cmd->conn	= conn;
+	cmd->conn = conn;
 	INIT_LIST_HEAD(&cmd->i_conn_node);
 	INIT_LIST_HEAD(&cmd->datain_list);
 	INIT_LIST_HEAD(&cmd->cmd_r2t_list);
···
 
 	return cmd;
 }
+EXPORT_SYMBOL(iscsit_allocate_cmd);
 
 struct iscsi_seq *iscsit_get_seq_holder_for_datain(
 	struct iscsi_cmd *cmd,
···
 
 	return ret;
 }
+EXPORT_SYMBOL(iscsit_sequence_cmd);
 
 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
 {
···
 	 */
 	switch (cmd->iscsi_opcode) {
 	case ISCSI_OP_SCSI_CMD:
+		if (cmd->data_direction == DMA_TO_DEVICE)
+			iscsit_stop_dataout_timer(cmd);
+		/*
+		 * Fallthrough
+		 */
 	case ISCSI_OP_SCSI_TMFUNC:
 		transport_generic_free_cmd(&cmd->se_cmd, 1);
 		break;
···
 		}
 		/* Fall-through */
 	default:
-		iscsit_release_cmd(cmd);
+		cmd->release_cmd(cmd);
 		break;
 	}
 }
···
  */
 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
 {
-	u8 iscsi_hdr[ISCSI_HDR_LEN];
-	int err;
-	struct kvec iov;
 	struct iscsi_login_rsp *hdr;
+	struct iscsi_login *login = conn->conn_login;
 
+	login->login_failed = 1;
 	iscsit_collect_login_stats(conn, status_class, status_detail);
 
-	memset(&iov, 0, sizeof(struct kvec));
-	memset(&iscsi_hdr, 0x0, ISCSI_HDR_LEN);
-
-	hdr	= (struct iscsi_login_rsp *)&iscsi_hdr;
+	hdr	= (struct iscsi_login_rsp *)&login->rsp[0];
 	hdr->opcode		= ISCSI_OP_LOGIN_RSP;
 	hdr->status_class	= status_class;
 	hdr->status_detail	= status_detail;
 	hdr->itt		= conn->login_itt;
 
-	iov.iov_base		= &iscsi_hdr;
-	iov.iov_len		= ISCSI_HDR_LEN;
-
-	PRINT_BUFF(iscsi_hdr, ISCSI_HDR_LEN);
-
-	err = tx_data(conn, &iov, 1, ISCSI_HDR_LEN);
-	if (err != ISCSI_HDR_LEN) {
-		pr_err("tx_data returned less than expected\n");
-		return -1;
-	}
-
-	return 0;
+	return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
 }
 
 void iscsit_print_session_params(struct iscsi_session *sess)
···
 		strcpy(ls->last_intr_fail_name,
 		       (intrname ? intrname->value : "Unknown"));
 
-		ls->last_intr_fail_ip_family = conn->sock->sk->sk_family;
+		ls->last_intr_fail_ip_family = conn->login_family;
+
 		snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
 				"%s", conn->login_ip);
 		ls->last_fail_time = get_jiffies_64();

drivers/target/iscsi/iscsi_target_util.h

···
 extern struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *);
 extern void iscsit_free_r2t(struct iscsi_r2t *, struct iscsi_cmd *);
 extern void iscsit_free_r2ts_from_list(struct iscsi_cmd *);
+extern struct iscsi_cmd *iscsit_alloc_cmd(struct iscsi_conn *, gfp_t);
 extern struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *, gfp_t);
 extern struct iscsi_seq *iscsit_get_seq_holder_for_datain(struct iscsi_cmd *, u32);
 extern struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *);

drivers/target/target_core_file.c

···
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/module.h>
+#include <linux/falloc.h>
 #include <scsi/scsi.h>
 #include <scsi/scsi_host.h>
+#include <asm/unaligned.h>
 
 #include <target/target_core_base.h>
 #include <target/target_core_backend.h>
···
 			" block_device blocks: %llu logical_block_size: %d\n",
 			dev_size, div_u64(dev_size, fd_dev->fd_block_size),
 			fd_dev->fd_block_size);
+		/*
+		 * Check if the underlying struct block_device request_queue supports
+		 * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
+		 * in ATA and we need to set TPE=1
+		 */
+		if (blk_queue_discard(q)) {
+			dev->dev_attrib.max_unmap_lba_count =
+				q->limits.max_discard_sectors;
+			/*
+			 * Currently hardcoded to 1 in Linux/SCSI code..
+			 */
+			dev->dev_attrib.max_unmap_block_desc_count = 1;
+			dev->dev_attrib.unmap_granularity =
+				q->limits.discard_granularity >> 9;
+			dev->dev_attrib.unmap_granularity_alignment =
+				q->limits.discard_alignment;
+			pr_debug("IFILE: BLOCK Discard support available,"
+					" disabled by default\n");
+		}
+		/*
+		 * Enable write same emulation for IBLOCK and use 0xFFFF as
+		 * the smaller WRITE_SAME(10) only has a two-byte block count.
+		 */
+		dev->dev_attrib.max_write_same_len = 0xFFFF;
+
+		if (blk_queue_nonrot(q))
+			dev->dev_attrib.is_nonrot = 1;
 	} else {
 		if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) {
 			pr_err("FILEIO: Missing fd_dev_size="
···
 
 		dev->dev_attrib.hw_block_size = FD_BLOCKSIZE;
 		dev->dev_attrib.hw_max_sectors = FD_MAX_SECTORS;
+
+		/*
+		 * Limit UNMAP emulation to 8k Number of LBAs (NoLB)
+		 */
+		dev->dev_attrib.max_unmap_lba_count = 0x2000;
+		/*
+		 * Currently hardcoded to 1 in Linux/SCSI code..
+		 */
+		dev->dev_attrib.max_unmap_block_desc_count = 1;
+		dev->dev_attrib.unmap_granularity = 1;
+		dev->dev_attrib.unmap_granularity_alignment = 0;
+
+		/*
+		 * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB)
+		 * based upon struct iovec limit for vfs_writev()
+		 */
+		dev->dev_attrib.max_write_same_len = 0x1000;
 	}
 
 	fd_dev->fd_block_size = dev->dev_attrib.hw_block_size;
···
 
 	fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++;
 	fd_dev->fd_queue_depth = dev->queue_depth;
-	/*
-	 * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB)
-	 * based upon struct iovec limit for vfs_writev()
-	 */
-	dev->dev_attrib.max_write_same_len = 0x1000;
 
 	pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s,"
 		" %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id,
···
 }
 
 static sense_reason_t
+fd_do_unmap(struct se_cmd *cmd, void *priv, sector_t lba, sector_t nolb)
+{
+	struct file *file = priv;
+	struct inode *inode = file->f_mapping->host;
+	int ret;
+
+	if (S_ISBLK(inode->i_mode)) {
+		/* The backend is block device, use discard */
+		struct block_device *bdev = inode->i_bdev;
+
+		ret = blkdev_issue_discard(bdev, lba,
+				nolb, GFP_KERNEL, 0);
+		if (ret < 0) {
+			pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n",
+				ret);
+			return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+		}
+	} else {
+		/* The backend is normal file, use fallocate */
+		struct se_device *se_dev = cmd->se_dev;
+		loff_t pos = lba * se_dev->dev_attrib.block_size;
+		unsigned int len = nolb * se_dev->dev_attrib.block_size;
+		int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE;
+
+		if (!file->f_op->fallocate)
+			return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+
+		ret = file->f_op->fallocate(file, mode, pos, len);
+		if (ret < 0) {
+			pr_warn("FILEIO: fallocate() failed: %d\n", ret);
+			return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+		}
+	}
+
+	return 0;
+}
+
+static sense_reason_t
+fd_execute_write_same_unmap(struct se_cmd *cmd)
+{
+	struct se_device *se_dev = cmd->se_dev;
+	struct fd_dev *fd_dev = FD_DEV(se_dev);
+	struct file *file = fd_dev->fd_file;
+	sector_t lba = cmd->t_task_lba;
+	sector_t nolb = sbc_get_write_same_sectors(cmd);
+	int ret;
+
+	if (!nolb) {
+		target_complete_cmd(cmd, SAM_STAT_GOOD);
+		return 0;
+	}
+
+	ret = fd_do_unmap(cmd, file, lba, nolb);
+	if (ret)
+		return ret;
+
+	target_complete_cmd(cmd, GOOD);
+	return 0;
+}
+
+static sense_reason_t
+fd_execute_unmap(struct se_cmd *cmd)
+{
+	struct file *file = FD_DEV(cmd->se_dev)->fd_file;
+
+	return sbc_execute_unmap(cmd, fd_do_unmap, file);
+}
+
+static sense_reason_t
 fd_execute_rw(struct se_cmd *cmd)
 {
 	struct scatterlist *sgl = cmd->t_data_sg;
···
 	.execute_rw		= fd_execute_rw,
 	.execute_sync_cache	= fd_execute_sync_cache,
 	.execute_write_same	= fd_execute_write_same,
+	.execute_write_same_unmap = fd_execute_write_same_unmap,
+	.execute_unmap		= fd_execute_unmap,
 };
 
 static sense_reason_t

drivers/target/target_core_iblock.c

···
 }
 
 static sense_reason_t
+iblock_do_unmap(struct se_cmd *cmd, void *priv,
+		sector_t lba, sector_t nolb)
+{
+	struct block_device *bdev = priv;
+	int ret;
+
+	ret = blkdev_issue_discard(bdev, lba, nolb, GFP_KERNEL, 0);
+	if (ret < 0) {
+		pr_err("blkdev_issue_discard() failed: %d\n", ret);
+		return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+	}
+
+	return 0;
+}
+
+static sense_reason_t
 iblock_execute_unmap(struct se_cmd *cmd)
 {
-	struct se_device *dev = cmd->se_dev;
-	struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
-	unsigned char *buf, *ptr = NULL;
-	sector_t lba;
-	int size;
-	u32 range;
-	sense_reason_t ret = 0;
-	int dl, bd_dl, err;
+	struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd;
 
-	/* We never set ANC_SUP */
-	if (cmd->t_task_cdb[1])
-		return TCM_INVALID_CDB_FIELD;
-
-	if (cmd->data_length == 0) {
-		target_complete_cmd(cmd, SAM_STAT_GOOD);
-		return 0;
-	}
-
-	if (cmd->data_length < 8) {
-		pr_warn("UNMAP parameter list length %u too small\n",
-			cmd->data_length);
-		return TCM_PARAMETER_LIST_LENGTH_ERROR;
-	}
-
-	buf = transport_kmap_data_sg(cmd);
-	if (!buf)
-		return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
-
-	dl = get_unaligned_be16(&buf[0]);
-	bd_dl = get_unaligned_be16(&buf[2]);
-
-	size = cmd->data_length - 8;
-	if (bd_dl > size)
-		pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
-			cmd->data_length, bd_dl);
-	else
-		size = bd_dl;
-
-	if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) {
-		ret = TCM_INVALID_PARAMETER_LIST;
-		goto err;
-	}
-
-	/* First UNMAP block descriptor starts at 8 byte offset */
-	ptr = &buf[8];
-	pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
-		" ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
-
-	while (size >= 16) {
-		lba = get_unaligned_be64(&ptr[0]);
-		range = get_unaligned_be32(&ptr[8]);
-		pr_debug("UNMAP: Using lba: %llu and range: %u\n",
-				 (unsigned long long)lba, range);
-
-		if (range > dev->dev_attrib.max_unmap_lba_count) {
-			ret = TCM_INVALID_PARAMETER_LIST;
-			goto err;
-		}
-
-		if (lba + range > dev->transport->get_blocks(dev) + 1) {
-			ret = TCM_ADDRESS_OUT_OF_RANGE;
-			goto err;
-		}
-
-		err = blkdev_issue_discard(ib_dev->ibd_bd, lba, range,
-					   GFP_KERNEL, 0);
-		if (err < 0) {
-			pr_err("blkdev_issue_discard() failed: %d\n",
-					err);
-			ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
-			goto err;
-		}
-
-		ptr += 16;
-		size -= 16;
-	}
-
-err:
-	transport_kunmap_data_sg(cmd);
-	if (!ret)
-		target_complete_cmd(cmd, GOOD);
-	return ret;
+	return sbc_execute_unmap(cmd, iblock_do_unmap, bdev);
 }
 
 static sense_reason_t
 iblock_execute_write_same_unmap(struct se_cmd *cmd)
 {
-	struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev);
-	int rc;
+	struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd;
+	sector_t lba = cmd->t_task_lba;
+	sector_t nolb = sbc_get_write_same_sectors(cmd);
+	int ret;
 
-	rc = blkdev_issue_discard(ib_dev->ibd_bd, cmd->t_task_lba,
-			sbc_get_write_same_sectors(cmd), GFP_KERNEL, 0);
-	if (rc < 0) {
-		pr_warn("blkdev_issue_discard() failed: %d\n", rc);
-		return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
-	}
+	ret = iblock_do_unmap(cmd, bdev, lba, nolb);
+	if (ret)
+		return ret;
 
 	target_complete_cmd(cmd, GOOD);
 	return 0;

drivers/target/target_core_sbc.c

···
 	return TYPE_DISK;
 }
 EXPORT_SYMBOL(sbc_get_device_type);
+
+sense_reason_t
+sbc_execute_unmap(struct se_cmd *cmd,
+	sense_reason_t (*do_unmap_fn)(struct se_cmd *, void *,
+				      sector_t, sector_t),
+	void *priv)
+{
+	struct se_device *dev = cmd->se_dev;
+	unsigned char *buf, *ptr = NULL;
+	sector_t lba;
+	int size;
+	u32 range;
+	sense_reason_t ret = 0;
+	int dl, bd_dl;
+
+	/* We never set ANC_SUP */
+	if (cmd->t_task_cdb[1])
+		return TCM_INVALID_CDB_FIELD;
+
+	if (cmd->data_length == 0) {
+		target_complete_cmd(cmd, SAM_STAT_GOOD);
+		return 0;
+	}
+
+	if (cmd->data_length < 8) {
+		pr_warn("UNMAP parameter list length %u too small\n",
+			cmd->data_length);
+		return TCM_PARAMETER_LIST_LENGTH_ERROR;
+	}
+
+	buf = transport_kmap_data_sg(cmd);
+	if (!buf)
+		return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+
+	dl = get_unaligned_be16(&buf[0]);
+	bd_dl = get_unaligned_be16(&buf[2]);
+
+	size = cmd->data_length - 8;
+	if (bd_dl > size)
+		pr_warn("UNMAP parameter list length %u too small, ignoring bd_dl %u\n",
+			cmd->data_length, bd_dl);
+	else
+		size = bd_dl;
+
+	if (size / 16 > dev->dev_attrib.max_unmap_block_desc_count) {
+		ret = TCM_INVALID_PARAMETER_LIST;
+		goto err;
+	}
+
+	/* First UNMAP block descriptor starts at 8 byte offset */
+	ptr = &buf[8];
+	pr_debug("UNMAP: Sub: %s Using dl: %u bd_dl: %u size: %u"
+		" ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
+
+	while (size >= 16) {
+		lba = get_unaligned_be64(&ptr[0]);
+		range = get_unaligned_be32(&ptr[8]);
+		pr_debug("UNMAP: Using lba: %llu and range: %u\n",
+				 (unsigned long long)lba, range);
+
+		if (range > dev->dev_attrib.max_unmap_lba_count) {
+			ret = TCM_INVALID_PARAMETER_LIST;
+			goto err;
+		}
+
+		if (lba + range > dev->transport->get_blocks(dev) + 1) {
+			ret = TCM_ADDRESS_OUT_OF_RANGE;
+			goto err;
+		}
+
+		ret = do_unmap_fn(cmd, priv, lba, range);
+		if (ret)
+			goto err;
+
+		ptr += 16;
+		size -= 16;
+	}
+
+err:
+	transport_kunmap_data_sg(cmd);
+	if (!ret)
+		target_complete_cmd(cmd, GOOD);
+	return ret;
+}
+EXPORT_SYMBOL(sbc_execute_unmap);

drivers/target/target_core_transport.c

···
 static void transport_handle_queue_full(struct se_cmd *cmd,
 		struct se_device *dev);
 static int transport_generic_get_mem(struct se_cmd *cmd);
-static int target_get_sess_cmd(struct se_session *, struct se_cmd *, bool);
 static void transport_put_cmd(struct se_cmd *cmd);
 static void target_complete_ok_work(struct work_struct *work);
 
···
  * @se_cmd:	command descriptor to add
  * @ack_kref:	Signal that fabric will perform an ack target_put_sess_cmd()
  */
-static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
+int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
 			       bool ack_kref)
 {
 	unsigned long flags;
···
 	spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
 	return ret;
 }
+EXPORT_SYMBOL(target_get_sess_cmd);
 
 static void target_release_cmd_kref(struct kref *kref)
 {
···
 		/* CURRENT ERROR */
 		buffer[0] = 0x70;
 		buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
-		/* ILLEGAL REQUEST */
-		buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
+		/*
+		 * Returning ILLEGAL REQUEST would cause immediate IO errors on
+		 * Solaris initiators.  Returning NOT READY instead means the
+		 * operations will be retried a finite number of times and we
+		 * can survive intermittent errors.
+		 */
+		buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
 		/* LOGICAL UNIT COMMUNICATION FAILURE */
 		buffer[SPC_ASC_KEY_OFFSET] = 0x08;
 		break;

drivers/target/tcm_fc/tfc_io.c

···
 	use_sg = !(remaining % 4);
 
 	while (remaining) {
+		struct fc_seq *seq = cmd->seq;
+
+		if (!seq) {
+			pr_debug("%s: Command aborted, xid 0x%x\n",
+				 __func__, ep->xid);
+			break;
+		}
 		if (!mem_len) {
 			sg = sg_next(sg);
 			mem_len = min((size_t)sg->length, remaining);
···
 			f_ctl |= FC_FC_END_SEQ;
 		fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid,
 			       FC_TYPE_FCP, f_ctl, fh_off);
-		error = lport->tt.seq_send(lport, cmd->seq, fp);
+		error = lport->tt.seq_send(lport, seq, fp);
 		if (error) {
 			/* XXX For now, initiator will retry */
 			pr_err_ratelimited("%s: Failed to send frame %p, "

drivers/target/tcm_fc/tfc_sess.c

···
 	return ret;
 }
 
-static void ft_sess_rcu_free(struct rcu_head *rcu)
-{
-	struct ft_sess *sess = container_of(rcu, struct ft_sess, rcu);
-
-	kfree(sess);
-}
-
 static void ft_sess_free(struct kref *kref)
 {
 	struct ft_sess *sess = container_of(kref, struct ft_sess, kref);
 
 	transport_deregister_session(sess->se_sess);
-	call_rcu(&sess->rcu, ft_sess_rcu_free);
+	kfree_rcu(sess, rcu);
 }
 
 void ft_sess_put(struct ft_sess *sess)

drivers/vhost/tcm_vhost.c

···
  * TODO: debug and remove the workaround.
  */
 enum {
-	VHOST_SCSI_FEATURES = VHOST_FEATURES & (~VIRTIO_RING_F_EVENT_IDX)
+	VHOST_SCSI_FEATURES = (VHOST_FEATURES & (~VIRTIO_RING_F_EVENT_IDX)) |
+			      (1ULL << VIRTIO_SCSI_F_HOTPLUG)
 };
 
 #define VHOST_SCSI_MAX_TARGET	256
 #define VHOST_SCSI_MAX_VQ	128
+#define VHOST_SCSI_MAX_EVENT	128
 
 struct vhost_scsi {
 	/* Protected by vhost_scsi->dev.mutex */
···
 
 	struct vhost_work vs_completion_work; /* cmd completion work item */
 	struct llist_head vs_completion_list; /* cmd completion queue */
+
+	struct vhost_work vs_event_work; /* evt injection work item */
+	struct llist_head vs_event_list; /* evt injection queue */
+
+	bool vs_events_missed; /* any missed events, protected by vq->mutex */
+	int vs_events_nr; /* num of pending events, protected by vq->mutex */
 };
 
 /* Local pointer to allocated TCM configfs fabric module */
···
 	return 0;
 }
 
+static void tcm_vhost_free_evt(struct vhost_scsi *vs, struct tcm_vhost_evt *evt)
+{
+	vs->vs_events_nr--;
+	kfree(evt);
+}
+
+static struct tcm_vhost_evt *tcm_vhost_allocate_evt(struct vhost_scsi *vs,
+	u32 event, u32 reason)
+{
+	struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT];
+	struct tcm_vhost_evt *evt;
+
+	if (vs->vs_events_nr > VHOST_SCSI_MAX_EVENT) {
+		vs->vs_events_missed = true;
+		return NULL;
+	}
+
+	evt = kzalloc(sizeof(*evt), GFP_KERNEL);
+	if (!evt) {
+		vq_err(vq, "Failed to allocate tcm_vhost_evt\n");
+		vs->vs_events_missed = true;
+		return NULL;
+	}
+
+	evt->event.event = event;
+	evt->event.reason = reason;
+	vs->vs_events_nr++;
+
+	return evt;
+}
+
 static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *tv_cmd)
 {
 	struct se_cmd *se_cmd = &tv_cmd->tvc_se_cmd;
···
 	}
 
 	kfree(tv_cmd);
+}
+
+static void tcm_vhost_do_evt_work(struct vhost_scsi *vs,
+	struct tcm_vhost_evt *evt)
+{
+	struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT];
+	struct virtio_scsi_event *event = &evt->event;
+	struct virtio_scsi_event __user *eventp;
+	unsigned out, in;
+	int head, ret;
+
+	if (!vq->private_data) {
+		vs->vs_events_missed = true;
+		return;
+	}
+
+again:
+	vhost_disable_notify(&vs->dev, vq);
+	head = vhost_get_vq_desc(&vs->dev, vq, vq->iov,
+			ARRAY_SIZE(vq->iov), &out, &in,
+			NULL, NULL);
+	if (head < 0) {
+		vs->vs_events_missed = true;
+		return;
+	}
+	if (head == vq->num) {
+		if (vhost_enable_notify(&vs->dev, vq))
+			goto again;
+		vs->vs_events_missed = true;
+		return;
+	}
+
+	if ((vq->iov[out].iov_len != sizeof(struct virtio_scsi_event))) {
+		vq_err(vq, "Expecting virtio_scsi_event, got %zu bytes\n",
+				vq->iov[out].iov_len);
+		vs->vs_events_missed = true;
+		return;
+	}
+
+	if (vs->vs_events_missed) {
+		event->event |= VIRTIO_SCSI_T_EVENTS_MISSED;
+		vs->vs_events_missed = false;
+	}
+
+	eventp = vq->iov[out].iov_base;
+	ret = __copy_to_user(eventp, event, sizeof(*event));
+	if (!ret)
+		vhost_add_used_and_signal(&vs->dev, vq, head, 0);
+	else
+		vq_err(vq, "Faulted on tcm_vhost_send_event\n");
+}
+
+static void tcm_vhost_evt_work(struct vhost_work *work)
+{
+	struct vhost_scsi *vs = container_of(work, struct vhost_scsi,
+					vs_event_work);
+	struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT];
+	struct tcm_vhost_evt *evt;
+	struct llist_node *llnode;
+
+	mutex_lock(&vq->mutex);
+	llnode = llist_del_all(&vs->vs_event_list);
+	while (llnode) {
+		evt = llist_entry(llnode, struct tcm_vhost_evt, list);
+		llnode = llist_next(llnode);
+		tcm_vhost_do_evt_work(vs, evt);
+		tcm_vhost_free_evt(vs, evt);
+	}
+	mutex_unlock(&vq->mutex);
 }
 
 /* Fill in status and signal that we are done processing this command
···
 	pr_debug("%s: The handling func for control queue.\n", __func__);
 }
 
+static void tcm_vhost_send_evt(struct vhost_scsi *vs, struct tcm_vhost_tpg *tpg,
+	struct se_lun *lun, u32 event, u32 reason)
+{
+	struct tcm_vhost_evt *evt;
+
+	evt = tcm_vhost_allocate_evt(vs, event, reason);
+	if (!evt)
+		return;
+
+	if (tpg && lun) {
+		/* TODO: share lun setup code with virtio-scsi.ko */
+		/*
+		 * Note: evt->event is zeroed when we allocate it and
+		 * lun[4-7] need to be zero according to virtio-scsi spec.
+		 */
+		evt->event.lun[0] = 0x01;
+		evt->event.lun[1] = tpg->tport_tpgt & 0xFF;
+		if (lun->unpacked_lun >= 256)
+			evt->event.lun[2] = lun->unpacked_lun >> 8 | 0x40 ;
+		evt->event.lun[3] = lun->unpacked_lun & 0xFF;
+	}
+
+	llist_add(&evt->list, &vs->vs_event_list);
+	vhost_work_queue(&vs->dev, &vs->vs_event_work);
+}
+
 static void vhost_scsi_evt_handle_kick(struct vhost_work *work)
 {
-	pr_debug("%s: The handling func for event queue.\n", __func__);
+	struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
+						poll.work);
+	struct vhost_scsi *vs = container_of(vq->dev, struct vhost_scsi, dev);
+
+	mutex_lock(&vq->mutex);
+	if (!vq->private_data)
+		goto out;
+
+	if (vs->vs_events_missed)
+		tcm_vhost_send_evt(vs, NULL, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
+out:
+	mutex_unlock(&vq->mutex);
 }
 
 static void vhost_scsi_handle_kick(struct vhost_work *work)
···
 	for (i = 0; i < VHOST_SCSI_MAX_VQ; i++)
 		vhost_scsi_flush_vq(vs, i);
 	vhost_work_flush(&vs->dev, &vs->vs_completion_work);
+	vhost_work_flush(&vs->dev, &vs->vs_event_work);
 }
 
 /*
  * Called from vhost_scsi_ioctl() context to walk the list of available
  * tcm_vhost_tpg with an active struct tcm_vhost_nexus
+ *
+ *  The lock nesting rule is:
+ *    tcm_vhost_mutex -> vs->dev.mutex -> tpg->tv_tpg_mutex -> vq->mutex
  */
 static int vhost_scsi_set_endpoint(
 	struct vhost_scsi *vs,
···
 	int index, ret, i, len;
 	bool match = false;
 
+	mutex_lock(&tcm_vhost_mutex);
 	mutex_lock(&vs->dev.mutex);
+
 	/* Verify that ring has been setup correctly. */
 	for (index = 0; index < vs->dev.nvqs; ++index) {
 		/* Verify that ring has been setup correctly. */
 		if (!vhost_vq_access_ok(&vs->vqs[index])) {
-			mutex_unlock(&vs->dev.mutex);
-			return -EFAULT;
+			ret = -EFAULT;
+			goto out;
 		}
 	}
 
 	len = sizeof(vs_tpg[0]) * VHOST_SCSI_MAX_TARGET;
 	vs_tpg = kzalloc(len, GFP_KERNEL);
 	if (!vs_tpg) {
-		mutex_unlock(&vs->dev.mutex);
-		return -ENOMEM;
+		ret = -ENOMEM;
+		goto out;
 	}
 	if (vs->vs_tpg)
 		memcpy(vs_tpg, vs->vs_tpg, len);
 
-	mutex_lock(&tcm_vhost_mutex);
 	list_for_each_entry(tv_tpg, &tcm_vhost_list, tv_tpg_list) {
 		mutex_lock(&tv_tpg->tv_tpg_mutex);
 		if (!tv_tpg->tpg_nexus) {
···
 
 		if (!strcmp(tv_tport->tport_name, t->vhost_wwpn)) {
 			if (vs->vs_tpg && vs->vs_tpg[tv_tpg->tport_tpgt]) {
-				mutex_unlock(&tv_tpg->tv_tpg_mutex);
-				mutex_unlock(&tcm_vhost_mutex);
-				mutex_unlock(&vs->dev.mutex);
 				kfree(vs_tpg);
-				return -EEXIST;
+				mutex_unlock(&tv_tpg->tv_tpg_mutex);
+				ret = -EEXIST;
+				goto out;
 			}
 			tv_tpg->tv_tpg_vhost_count++;
+			tv_tpg->vhost_scsi = vs;
 			vs_tpg[tv_tpg->tport_tpgt] = tv_tpg;
 			smp_mb__after_atomic_inc();
 			match = true;
 		}
 		mutex_unlock(&tv_tpg->tv_tpg_mutex);
 	}
-	mutex_unlock(&tcm_vhost_mutex);
 
 	if (match) {
 		memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn,
···
 	kfree(vs->vs_tpg);
 	vs->vs_tpg = vs_tpg;
 
+out:
 	mutex_unlock(&vs->dev.mutex);
+	mutex_unlock(&tcm_vhost_mutex);
 	return ret;
 }
 
···
 	int index, ret, i;
 	u8 target;
 
+	mutex_lock(&tcm_vhost_mutex);
 	mutex_lock(&vs->dev.mutex);
 	/* Verify that ring has been setup correctly. */
 	for (index = 0; index < vs->dev.nvqs; ++index) {
···
 	}
 
 	if (!vs->vs_tpg) {
-		mutex_unlock(&vs->dev.mutex);
-		return 0;
+		ret = 0;
+		goto err_dev;
 	}
 
 	for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) {
···
 			goto err_tpg;
 		}
 		tv_tpg->tv_tpg_vhost_count--;
+		tv_tpg->vhost_scsi = NULL;
 		vs->vs_tpg[target] = NULL;
 		match = true;
 		mutex_unlock(&tv_tpg->tv_tpg_mutex);
···
 	vhost_scsi_flush(vs);
 	kfree(vs->vs_tpg);
 	vs->vs_tpg = NULL;
+	WARN_ON(vs->vs_events_nr);
 	mutex_unlock(&vs->dev.mutex);
-
+	mutex_unlock(&tcm_vhost_mutex);
 	return 0;
 
 err_tpg:
 	mutex_unlock(&tv_tpg->tv_tpg_mutex);
 err_dev:
 	mutex_unlock(&vs->dev.mutex);
+	mutex_unlock(&tcm_vhost_mutex);
 	return ret;
 }
 
···
 		return -ENOMEM;
 
 	vhost_work_init(&s->vs_completion_work, vhost_scsi_complete_cmd_work);
+	vhost_work_init(&s->vs_event_work, tcm_vhost_evt_work);
+
+	s->vs_events_nr = 0;
+	s->vs_events_missed = false;
 
 	s->vqs[VHOST_SCSI_VQ_CTL].handle_kick = vhost_scsi_ctl_handle_kick;
 	s->vqs[VHOST_SCSI_VQ_EVT].handle_kick = vhost_scsi_evt_handle_kick;
···
 	vhost_scsi_clear_endpoint(s, &t);
 	vhost_dev_stop(&s->dev);
 	vhost_dev_cleanup(&s->dev, false);
+	/* Jobs can re-queue themselves in evt kick handler. Do extra flush. */
+	vhost_scsi_flush(s);
 	kfree(s);
 	return 0;
 }
···
 	struct vhost_scsi_target backend;
 	void __user *argp = (void __user *)arg;
 	u64 __user *featurep = argp;
+	u32 __user *eventsp = argp;
+	u32 events_missed;
 	u64 features;
 	int r, abi_version = VHOST_SCSI_ABI_VERSION;
+	struct vhost_virtqueue *vq = &vs->vqs[VHOST_SCSI_VQ_EVT];
 
 	switch (ioctl) {
 	case VHOST_SCSI_SET_ENDPOINT:
···
 		return vhost_scsi_clear_endpoint(vs, &backend);
 	case VHOST_SCSI_GET_ABI_VERSION:
 		if (copy_to_user(argp, &abi_version, sizeof abi_version))
+			return -EFAULT;
+		return 0;
+	case VHOST_SCSI_SET_EVENTS_MISSED:
+		if (get_user(events_missed, eventsp))
+			return -EFAULT;
+		mutex_lock(&vq->mutex);
+		vs->vs_events_missed = events_missed;
+		mutex_unlock(&vq->mutex);
+		return 0;
+	case VHOST_SCSI_GET_EVENTS_MISSED:
+		mutex_lock(&vq->mutex);
+		events_missed = vs->vs_events_missed;
+		mutex_unlock(&vq->mutex);
+		if (put_user(events_missed, eventsp))
 			return -EFAULT;
 		return 0;
 	case VHOST_GET_FEATURES:
···
 	return "Unknown";
 }
 
+static void tcm_vhost_do_plug(struct tcm_vhost_tpg *tpg,
+	struct se_lun *lun, bool plug)
+{
+
+	struct vhost_scsi *vs = tpg->vhost_scsi;
+	struct vhost_virtqueue *vq;
+	u32 reason;
+
+	if (!vs)
+		return;
+
+	mutex_lock(&vs->dev.mutex);
+	if (!vhost_has_feature(&vs->dev, VIRTIO_SCSI_F_HOTPLUG)) {
+		mutex_unlock(&vs->dev.mutex);
+		return;
+	}
+
+	if (plug)
+		reason = VIRTIO_SCSI_EVT_RESET_RESCAN;
+	else
+		reason = VIRTIO_SCSI_EVT_RESET_REMOVED;
+
+	vq = &vs->vqs[VHOST_SCSI_VQ_EVT];
+	mutex_lock(&vq->mutex);
+	tcm_vhost_send_evt(vs, tpg, lun,
+			VIRTIO_SCSI_T_TRANSPORT_RESET, reason);
+	mutex_unlock(&vq->mutex);
+	mutex_unlock(&vs->dev.mutex);
+}
+
+static void tcm_vhost_hotplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun)
+{
+	tcm_vhost_do_plug(tpg, lun, true);
+}
+
+static void tcm_vhost_hotunplug(struct tcm_vhost_tpg *tpg, struct se_lun *lun)
+{
+	tcm_vhost_do_plug(tpg, lun, false);
+}
+
 static int tcm_vhost_port_link(struct se_portal_group *se_tpg,
 	struct se_lun *lun)
 {
 	struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
 				struct tcm_vhost_tpg, se_tpg);
 
+	mutex_lock(&tcm_vhost_mutex);
+
 	mutex_lock(&tv_tpg->tv_tpg_mutex);
 	tv_tpg->tv_tpg_port_count++;
 	mutex_unlock(&tv_tpg->tv_tpg_mutex);
+
+	tcm_vhost_hotplug(tv_tpg, lun);
+
+	mutex_unlock(&tcm_vhost_mutex);
 
 	return 0;
 }
 
 static void tcm_vhost_port_unlink(struct se_portal_group *se_tpg,
-	struct se_lun *se_lun)
+	struct se_lun *lun)
 {
 	struct tcm_vhost_tpg *tv_tpg = container_of(se_tpg,
 				struct tcm_vhost_tpg, se_tpg);
 
+	mutex_lock(&tcm_vhost_mutex);
+
 	mutex_lock(&tv_tpg->tv_tpg_mutex);
 	tv_tpg->tv_tpg_port_count--;
 	mutex_unlock(&tv_tpg->tv_tpg_mutex);
+
+	tcm_vhost_hotunplug(tv_tpg, lun);
+
+	mutex_unlock(&tcm_vhost_mutex);
 }
 
 static struct se_node_acl *tcm_vhost_make_nodeacl(

drivers/vhost/tcm_vhost.h

···
 	struct se_node_acl se_node_acl;
 };
 
+struct vhost_scsi;
 struct tcm_vhost_tpg {
 	/* Vhost port target portal group tag for TCM */
 	u16 tport_tpgt;
···
 	struct tcm_vhost_tport *tport;
 	/* Returned by tcm_vhost_make_tpg() */
 	struct se_portal_group se_tpg;
+	/* Pointer back to vhost_scsi, protected by tv_tpg_mutex */
+	struct vhost_scsi *vhost_scsi;
 };
 
 struct tcm_vhost_tport {
···
 	char tport_name[TCM_VHOST_NAMELEN];
 	/* Returned by tcm_vhost_make_tport() */
 	struct se_wwn tport_wwn;
+};
+
+struct tcm_vhost_evt {
+	/* event to be sent to guest */
+	struct virtio_scsi_event event;
+	/* event list, serviced from vhost worker thread */
+	struct llist_node list;
 };
 
 /*
···
 #define VHOST_SCSI_CLEAR_ENDPOINT _IOW(VHOST_VIRTIO, 0x41, struct vhost_scsi_target)
 /* Changing this breaks userspace. */
 #define VHOST_SCSI_GET_ABI_VERSION _IOW(VHOST_VIRTIO, 0x42, int)
+/* Set and get the events missed flag */
+#define VHOST_SCSI_SET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x43, __u32)
+#define VHOST_SCSI_GET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x44, __u32)

include/target/iscsi/iscsi_transport.h

···
+#include <linux/module.h>
+#include <linux/list.h>
+#include "../../../drivers/target/iscsi/iscsi_target_core.h"
+
+struct iscsit_transport {
+#define ISCSIT_TRANSPORT_NAME	16
+	char name[ISCSIT_TRANSPORT_NAME];
+	int transport_type;
+	struct module *owner;
+	struct list_head t_node;
+	int (*iscsit_setup_np)(struct iscsi_np *, struct __kernel_sockaddr_storage *);
+	int (*iscsit_accept_np)(struct iscsi_np *, struct iscsi_conn *);
+	void (*iscsit_free_np)(struct iscsi_np *);
+	void (*iscsit_free_conn)(struct iscsi_conn *);
+	struct iscsi_cmd *(*iscsit_alloc_cmd)(struct iscsi_conn *, gfp_t);
+	int (*iscsit_get_login_rx)(struct iscsi_conn *, struct iscsi_login *);
+	int (*iscsit_put_login_tx)(struct iscsi_conn *, struct iscsi_login *, u32);
+	int (*iscsit_immediate_queue)(struct iscsi_conn *, struct iscsi_cmd *, int);
+	int (*iscsit_response_queue)(struct iscsi_conn *, struct iscsi_cmd *, int);
+	int (*iscsit_get_dataout)(struct iscsi_conn *, struct iscsi_cmd *, bool);
+	int (*iscsit_queue_data_in)(struct iscsi_conn *, struct iscsi_cmd *);
+	int (*iscsit_queue_status)(struct iscsi_conn *, struct iscsi_cmd *);
+};
+
+/*
+ * From iscsi_target_transport.c
+ */
+
+extern int iscsit_register_transport(struct iscsit_transport *);
+extern void iscsit_unregister_transport(struct iscsit_transport *);
+extern struct iscsit_transport *iscsit_get_transport(int);
+extern void iscsit_put_transport(struct iscsit_transport *);
+
+/*
+ * From iscsi_target.c
+ */
+extern int iscsit_add_reject_from_cmd(u8, int, int, unsigned char *,
+				struct iscsi_cmd *);
+extern int iscsit_setup_scsi_cmd(struct iscsi_conn *, struct iscsi_cmd *,
+				unsigned char *);
+extern void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *);
+extern int iscsit_process_scsi_cmd(struct iscsi_conn *, struct iscsi_cmd *,
+				struct iscsi_scsi_req *);
+extern int iscsit_check_dataout_hdr(struct iscsi_conn *, unsigned char *,
+				struct iscsi_cmd **);
+extern int iscsit_check_dataout_payload(struct iscsi_cmd *, struct iscsi_data *,
+				bool);
+extern int iscsit_handle_nop_out(struct iscsi_conn *, struct iscsi_cmd *,
+				unsigned char *);
+extern int iscsit_handle_logout_cmd(struct iscsi_conn *, struct iscsi_cmd *,
+				unsigned char *);
+extern int iscsit_handle_task_mgt_cmd(struct iscsi_conn *, struct iscsi_cmd *,
+				unsigned char *);
+extern void iscsit_build_rsp_pdu(struct iscsi_cmd *, struct iscsi_conn *,
+				bool, struct iscsi_scsi_rsp *);
+extern void iscsit_build_nopin_rsp(struct iscsi_cmd *, struct iscsi_conn *,
+				struct iscsi_nopin *, bool);
+extern void iscsit_build_task_mgt_rsp(struct iscsi_cmd *, struct iscsi_conn *,
+				struct iscsi_tm_rsp *);
+extern void iscsit_build_reject(struct iscsi_cmd *, struct iscsi_conn *,
+				struct iscsi_reject *);
+extern int iscsit_build_logout_rsp(struct iscsi_cmd *, struct iscsi_conn *,
+				struct iscsi_logout_rsp *);
+extern int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
+/*
+ * From iscsi_target_device.c
+ */
+extern void iscsit_increment_maxcmdsn(struct iscsi_cmd *, struct iscsi_session *);
+/*
+ * From iscsi_target_erl1.c
+ */
+extern void iscsit_stop_dataout_timer(struct iscsi_cmd *);
+
+/*
+ * From iscsi_target_tmr.c
+ */
+extern int iscsit_tmr_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
+
+/*
+ * From iscsi_target_util.c
+ */
+extern struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *, gfp_t);
+extern int iscsit_sequence_cmd(struct iscsi_conn *, struct iscsi_cmd *, __be32);

include/target/target_core_backend.h

···
 u32	sbc_get_device_rev(struct se_device *dev);
 u32	sbc_get_device_type(struct se_device *dev);
 sector_t	sbc_get_write_same_sectors(struct se_cmd *cmd);
+sense_reason_t sbc_execute_unmap(struct se_cmd *cmd,
+	sense_reason_t (*do_unmap_fn)(struct se_cmd *cmd, void *priv,
+				      sector_t lba, sector_t nolb),
+	void *priv);
 
 void	transport_set_vpd_proto_id(struct t10_vpd *, unsigned char *);
 int	transport_set_vpd_assoc(struct t10_vpd *, unsigned char *);

include/target/target_core_fabric.h

···
 int	transport_check_aborted_status(struct se_cmd *, int);
 int	transport_send_check_condition_and_sense(struct se_cmd *,
 		sense_reason_t, int);
-
+int	target_get_sess_cmd(struct se_session *, struct se_cmd *, bool);
 int	target_put_sess_cmd(struct se_session *, struct se_cmd *);
 void	target_sess_cmd_list_set_waiting(struct se_session *);
 void	target_wait_for_sess_cmds(struct se_session *, int);