[SCSI] cxgb3i: change cxgb3i to use libcxgbi

Signed-off-by: Karen Xie <[e-mail]>
Reviewed-by: Mike Christie <[e-mail]>
Signed-off-by: James Bottomley <[e-mail]>

drivers/scsi/Kconfig

···
 	  via sysfs to userspace. If you wish to export this information,
 	  say Y. Otherwise, say N.
 
-source "drivers/scsi/cxgb3i/Kconfig"
 source "drivers/scsi/cxgbi/Kconfig"
 source "drivers/scsi/bnx2i/Kconfig"
 source "drivers/scsi/be2iscsi/Kconfig"

drivers/scsi/Makefile

···
 obj-$(CONFIG_SCSI_STEX)		+= stex.o
 obj-$(CONFIG_SCSI_MVSAS)	+= mvsas/
 obj-$(CONFIG_PS3_ROM)		+= ps3rom.o
-obj-$(CONFIG_SCSI_CXGB3_ISCSI)	+= libiscsi.o libiscsi_tcp.o cxgb3i/
+obj-$(CONFIG_SCSI_CXGB3_ISCSI)	+= libiscsi.o libiscsi_tcp.o cxgbi/
 obj-$(CONFIG_SCSI_CXGB4_ISCSI)	+= libiscsi.o libiscsi_tcp.o cxgbi/
 obj-$(CONFIG_SCSI_BNX2_ISCSI)	+= libiscsi.o bnx2i/
 obj-$(CONFIG_BE2ISCSI)		+= libiscsi.o be2iscsi/

drivers/scsi/cxgb3i/Kbuild drivers/scsi/cxgbi/cxgb3i/Kbuild

···
 EXTRA_CFLAGS += -I$(srctree)/drivers/net/cxgb3
 
-cxgb3i-y := cxgb3i_init.o cxgb3i_iscsi.o cxgb3i_pdu.o cxgb3i_offload.o cxgb3i_ddp.o
 obj-$(CONFIG_SCSI_CXGB3_ISCSI) += cxgb3i.o

drivers/scsi/cxgb3i/Kconfig drivers/scsi/cxgbi/cxgb3i/Kconfig

···
 config SCSI_CXGB3_ISCSI
-	tristate "Chelsio S3xx iSCSI support"
+	tristate "Chelsio T3 iSCSI support"
 	depends on CHELSIO_T3_DEPENDS
 	select CHELSIO_T3
 	select SCSI_ISCSI_ATTRS
 	---help---
-	This driver supports iSCSI offload for the Chelsio S3 series devices.
+	  This driver supports iSCSI offload for the Chelsio T3 devices.

drivers/scsi/cxgb3i/cxgb3i.h

···
-/*
- * cxgb3i.h: Chelsio S3xx iSCSI driver.
- *
- * Copyright (c) 2008 Chelsio Communications, Inc.
- *
- * 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.
- *
- * Written by: Karen Xie ([e-mail])
- */
-
-#ifndef __CXGB3I_H__
-#define __CXGB3I_H__
-
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/errno.h>
-#include <linux/types.h>
-#include <linux/list.h>
-#include <linux/netdevice.h>
-#include <linux/scatterlist.h>
-#include <linux/skbuff.h>
-#include <scsi/libiscsi_tcp.h>
-
-/* from cxgb3 LLD */
-#include "common.h"
-#include "t3_cpl.h"
-#include "t3cdev.h"
-#include "cxgb3_ctl_defs.h"
-#include "cxgb3_offload.h"
-#include "firmware_exports.h"
-
-#include "cxgb3i_offload.h"
-#include "cxgb3i_ddp.h"
-
-#define CXGB3I_SCSI_HOST_QDEPTH 1024
-#define CXGB3I_MAX_TARGET	CXGB3I_MAX_CONN
-#define CXGB3I_MAX_LUN		512
-#define ISCSI_PDU_NONPAYLOAD_MAX \
-	(sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE + 2*ISCSI_DIGEST_SIZE)
-
-struct cxgb3i_adapter;
-struct cxgb3i_hba;
-struct cxgb3i_endpoint;
-
-/**
- * struct cxgb3i_hba - cxgb3i iscsi structure (per port)
- *
- * @snic:	cxgb3i adapter containing this port
- * @ndev:	pointer to netdev structure
- * @shost:	pointer to scsi host structure
- */
-struct cxgb3i_hba {
-	struct cxgb3i_adapter *snic;
-	struct net_device *ndev;
-	struct Scsi_Host *shost;
-};
-
-/**
- * struct cxgb3i_adapter - cxgb3i adapter structure (per pci)
- *
- * @listhead:	list head to link elements
- * @lock:	lock for this structure
- * @tdev:	pointer to t3cdev used by cxgb3 driver
- * @pdev:	pointer to pci dev
- * @hba_cnt:	# of hbas (the same as # of ports)
- * @hba:	all the hbas on this adapter
- * @flags:	bit flag for adapter event/status
- * @tx_max_size: max. tx packet size supported
- * @rx_max_size: max. rx packet size supported
- * @tag_format: ddp tag format settings
- */
-#define CXGB3I_ADAPTER_FLAG_RESET	0x1
-struct cxgb3i_adapter {
-	struct list_head list_head;
-	spinlock_t lock;
-	struct t3cdev *tdev;
-	struct pci_dev *pdev;
-	unsigned char hba_cnt;
-	struct cxgb3i_hba *hba[MAX_NPORTS];
-
-	unsigned int flags;
-	unsigned int tx_max_size;
-	unsigned int rx_max_size;
-
-	struct cxgb3i_tag_format tag_format;
-};
-
-/**
- * struct cxgb3i_conn - cxgb3i iscsi connection
- *
- * @listhead:	list head to link elements
- * @cep:	pointer to iscsi_endpoint structure
- * @conn:	pointer to iscsi_conn structure
- * @hba:	pointer to the hba this conn. is going through
- * @task_idx_bits: # of bits needed for session->cmds_max
- */
-struct cxgb3i_conn {
-	struct list_head list_head;
-	struct cxgb3i_endpoint *cep;
-	struct iscsi_conn *conn;
-	struct cxgb3i_hba *hba;
-	unsigned int task_idx_bits;
-};
-
-/**
- * struct cxgb3i_endpoint - iscsi tcp endpoint
- *
- * @c3cn:	the h/w tcp connection representation
- * @hba:	pointer to the hba this conn. is going through
- * @cconn:	pointer to the associated cxgb3i iscsi connection
- */
-struct cxgb3i_endpoint {
-	struct s3_conn *c3cn;
-	struct cxgb3i_hba *hba;
-	struct cxgb3i_conn *cconn;
-};
-
-/**
- * struct cxgb3i_task_data - private iscsi task data
- *
- * @nr_frags:	# of coalesced page frags (from scsi sgl)
- * @frags:	coalesced page frags (from scsi sgl)
- * @skb:	tx pdu skb
- * @offset:	data offset for the next pdu
- * @count:	max. possible pdu payload
- * @sgoffset:	offset to the first sg entry for a given offset
- */
-#define MAX_PDU_FRAGS	((ULP2_MAX_PDU_PAYLOAD + 512 - 1) / 512)
-struct cxgb3i_task_data {
-	unsigned short nr_frags;
-	skb_frag_t frags[MAX_PDU_FRAGS];
-	struct sk_buff *skb;
-	unsigned int offset;
-	unsigned int count;
-	unsigned int sgoffset;
-};
-
-int cxgb3i_iscsi_init(void);
-void cxgb3i_iscsi_cleanup(void);
-
-struct cxgb3i_adapter *cxgb3i_adapter_find_by_tdev(struct t3cdev *);
-void cxgb3i_adapter_open(struct t3cdev *);
-void cxgb3i_adapter_close(struct t3cdev *);
-
-struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *,
-				       struct net_device *);
-void cxgb3i_hba_host_remove(struct cxgb3i_hba *);
-
-int cxgb3i_pdu_init(void);
-void cxgb3i_pdu_cleanup(void);
-void cxgb3i_conn_cleanup_task(struct iscsi_task *);
-int cxgb3i_conn_alloc_pdu(struct iscsi_task *, u8);
-int cxgb3i_conn_init_pdu(struct iscsi_task *, unsigned int, unsigned int);
-int cxgb3i_conn_xmit_pdu(struct iscsi_task *);
-
-void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt);
-int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt);
-
-#endif

drivers/scsi/cxgb3i/cxgb3i_ddp.c

···
-/*
- * cxgb3i_ddp.c: Chelsio S3xx iSCSI DDP Manager.
- *
- * Copyright (c) 2008 Chelsio Communications, Inc.
- *
- * 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.
- *
- * Written by: Karen Xie ([e-mail])
- */
-
-#include <linux/slab.h>
-#include <linux/skbuff.h>
-#include <linux/scatterlist.h>
-
-/* from cxgb3 LLD */
-#include "common.h"
-#include "t3_cpl.h"
-#include "t3cdev.h"
-#include "cxgb3_ctl_defs.h"
-#include "cxgb3_offload.h"
-#include "firmware_exports.h"
-
-#include "cxgb3i_ddp.h"
-
-#define ddp_log_error(fmt...) printk(KERN_ERR "cxgb3i_ddp: ERR! " fmt)
-#define ddp_log_warn(fmt...)  printk(KERN_WARNING "cxgb3i_ddp: WARN! " fmt)
-#define ddp_log_info(fmt...)  printk(KERN_INFO "cxgb3i_ddp: " fmt)
-
-#ifdef __DEBUG_CXGB3I_DDP__
-#define ddp_log_debug(fmt, args...) \
-	printk(KERN_INFO "cxgb3i_ddp: %s - " fmt, __func__ , ## args)
-#else
-#define ddp_log_debug(fmt...)
-#endif
-
-/*
- * iSCSI Direct Data Placement
- *
- * T3 h/w can directly place the iSCSI Data-In or Data-Out PDU's payload into
- * pre-posted final destination host-memory buffers based on the Initiator
- * Task Tag (ITT) in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
- *
- * The host memory address is programmed into h/w in the format of pagepod
- * entries.
- * The location of the pagepod entry is encoded into ddp tag which is used or
- * is the base for ITT/TTT.
- */
-
-#define DDP_PGIDX_MAX		4
-#define DDP_THRESHOLD	2048
-static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
-static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
-static unsigned char page_idx = DDP_PGIDX_MAX;
-
-/*
- * functions to program the pagepod in h/w
- */
-static inline void ulp_mem_io_set_hdr(struct sk_buff *skb, unsigned int addr)
-{
-	struct ulp_mem_io *req = (struct ulp_mem_io *)skb->head;
-
-	req->wr.wr_lo = 0;
-	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_BYPASS));
-	req->cmd_lock_addr = htonl(V_ULP_MEMIO_ADDR(addr >> 5) |
-				   V_ULPTX_CMD(ULP_MEM_WRITE));
-	req->len = htonl(V_ULP_MEMIO_DATA_LEN(PPOD_SIZE >> 5) |
-			 V_ULPTX_NFLITS((PPOD_SIZE >> 3) + 1));
-}
-
-static int set_ddp_map(struct cxgb3i_ddp_info *ddp, struct pagepod_hdr *hdr,
-		       unsigned int idx, unsigned int npods,
-		       struct cxgb3i_gather_list *gl)
-{
-	unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
-	int i;
-
-	for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
-		struct sk_buff *skb = ddp->gl_skb[idx];
-		struct pagepod *ppod;
-		int j, pidx;
-
-		/* hold on to the skb until we clear the ddp mapping */
-		skb_get(skb);
-
-		ulp_mem_io_set_hdr(skb, pm_addr);
-		ppod = (struct pagepod *)
-		       (skb->head + sizeof(struct ulp_mem_io));
-		memcpy(&(ppod->hdr), hdr, sizeof(struct pagepod));
-		for (pidx = 4 * i, j = 0; j < 5; ++j, ++pidx)
-			ppod->addr[j] = pidx < gl->nelem ?
-				     cpu_to_be64(gl->phys_addr[pidx]) : 0UL;
-
-		skb->priority = CPL_PRIORITY_CONTROL;
-		cxgb3_ofld_send(ddp->tdev, skb);
-	}
-	return 0;
-}
-
-static void clear_ddp_map(struct cxgb3i_ddp_info *ddp, unsigned int tag,
-			 unsigned int idx, unsigned int npods)
-{
-	unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
-	int i;
-
-	for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
-		struct sk_buff *skb = ddp->gl_skb[idx];
-
-		if (!skb) {
-			ddp_log_error("ddp tag 0x%x, 0x%x, %d/%u, skb NULL.\n",
-					tag, idx, i, npods);
-			continue;
-		}
-		ddp->gl_skb[idx] = NULL;
-		memset((skb->head + sizeof(struct ulp_mem_io)), 0, PPOD_SIZE);
-		ulp_mem_io_set_hdr(skb, pm_addr);
-		skb->priority = CPL_PRIORITY_CONTROL;
-		cxgb3_ofld_send(ddp->tdev, skb);
-	}
-}
-
-static inline int ddp_find_unused_entries(struct cxgb3i_ddp_info *ddp,
-					  unsigned int start, unsigned int max,
-					  unsigned int count,
-					  struct cxgb3i_gather_list *gl)
-{
-	unsigned int i, j, k;
-
-	/* not enough entries */
-	if ((max - start) < count)
-		return -EBUSY;
-
-	max -= count;
-	spin_lock(&ddp->map_lock);
-	for (i = start; i < max;) {
-		for (j = 0, k = i; j < count; j++, k++) {
-			if (ddp->gl_map[k])
-				break;
-		}
-		if (j == count) {
-			for (j = 0, k = i; j < count; j++, k++)
-				ddp->gl_map[k] = gl;
-			spin_unlock(&ddp->map_lock);
-			return i;
-		}
-		i += j + 1;
-	}
-	spin_unlock(&ddp->map_lock);
-	return -EBUSY;
-}
-
-static inline void ddp_unmark_entries(struct cxgb3i_ddp_info *ddp,
-				      int start, int count)
-{
-	spin_lock(&ddp->map_lock);
-	memset(&ddp->gl_map[start], 0,
-	       count * sizeof(struct cxgb3i_gather_list *));
-	spin_unlock(&ddp->map_lock);
-}
-
-static inline void ddp_free_gl_skb(struct cxgb3i_ddp_info *ddp,
-				   int idx, int count)
-{
-	int i;
-
-	for (i = 0; i < count; i++, idx++)
-		if (ddp->gl_skb[idx]) {
-			kfree_skb(ddp->gl_skb[idx]);
-			ddp->gl_skb[idx] = NULL;
-		}
-}
-
-static inline int ddp_alloc_gl_skb(struct cxgb3i_ddp_info *ddp, int idx,
-				   int count, gfp_t gfp)
-{
-	int i;
-
-	for (i = 0; i < count; i++) {
-		struct sk_buff *skb = alloc_skb(sizeof(struct ulp_mem_io) +
-						PPOD_SIZE, gfp);
-		if (skb) {
-			ddp->gl_skb[idx + i] = skb;
-			skb_put(skb, sizeof(struct ulp_mem_io) + PPOD_SIZE);
-		} else {
-			ddp_free_gl_skb(ddp, idx, i);
-			return -ENOMEM;
-		}
-	}
-	return 0;
-}
-
-/**
- * cxgb3i_ddp_find_page_index - return ddp page index for a given page size
- * @pgsz: page size
- * return the ddp page index, if no match is found return DDP_PGIDX_MAX.
- */
-int cxgb3i_ddp_find_page_index(unsigned long pgsz)
-{
-	int i;
-
-	for (i = 0; i < DDP_PGIDX_MAX; i++) {
-		if (pgsz == (1UL << ddp_page_shift[i]))
-			return i;
-	}
-	ddp_log_debug("ddp page size 0x%lx not supported.\n", pgsz);
-	return DDP_PGIDX_MAX;
-}
-
-/**
- * cxgb3i_ddp_adjust_page_table - adjust page table with PAGE_SIZE
- * return the ddp page index, if no match is found return DDP_PGIDX_MAX.
- */
-int cxgb3i_ddp_adjust_page_table(void)
-{
-	int i;
-	unsigned int base_order, order;
-
-	if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
-		ddp_log_info("PAGE_SIZE 0x%lx too small, min. 0x%lx.\n",
-				PAGE_SIZE, 1UL << ddp_page_shift[0]);
-		return -EINVAL;
-	}
-
-	base_order = get_order(1UL << ddp_page_shift[0]);
-	order = get_order(1 << PAGE_SHIFT);
-	for (i = 0; i < DDP_PGIDX_MAX; i++) {
-		/* first is the kernel page size, then just doubling the size */
-		ddp_page_order[i] = order - base_order + i;
-		ddp_page_shift[i] = PAGE_SHIFT + i;
-	}
-	return 0;
-}
-
-static inline void ddp_gl_unmap(struct pci_dev *pdev,
-				struct cxgb3i_gather_list *gl)
-{
-	int i;
-
-	for (i = 0; i < gl->nelem; i++)
-		pci_unmap_page(pdev, gl->phys_addr[i], PAGE_SIZE,
-			       PCI_DMA_FROMDEVICE);
-}
-
-static inline int ddp_gl_map(struct pci_dev *pdev,
-			     struct cxgb3i_gather_list *gl)
-{
-	int i;
-
-	for (i = 0; i < gl->nelem; i++) {
-		gl->phys_addr[i] = pci_map_page(pdev, gl->pages[i], 0,
-						PAGE_SIZE,
-						PCI_DMA_FROMDEVICE);
-		if (unlikely(pci_dma_mapping_error(pdev, gl->phys_addr[i])))
-			goto unmap;
-	}
-
-	return i;
-
-unmap:
-	if (i) {
-		unsigned int nelem = gl->nelem;
-
-		gl->nelem = i;
-		ddp_gl_unmap(pdev, gl);
-		gl->nelem = nelem;
-	}
-	return -ENOMEM;
-}
-
-/**
- * cxgb3i_ddp_make_gl - build ddp page buffer list
- * @xferlen: total buffer length
- * @sgl: page buffer scatter-gather list
- * @sgcnt: # of page buffers
- * @pdev: pci_dev, used for pci map
- * @gfp: allocation mode
- *
- * construct a ddp page buffer list from the scsi scattergather list.
- * coalesce buffers as much as possible, and obtain dma addresses for
- * each page.
- *
- * Return the cxgb3i_gather_list constructed from the page buffers if the
- * memory can be used for ddp. Return NULL otherwise.
- */
-struct cxgb3i_gather_list *cxgb3i_ddp_make_gl(unsigned int xferlen,
-					      struct scatterlist *sgl,
-					      unsigned int sgcnt,
-					      struct pci_dev *pdev,
-					      gfp_t gfp)
-{
-	struct cxgb3i_gather_list *gl;
-	struct scatterlist *sg = sgl;
-	struct page *sgpage = sg_page(sg);
-	unsigned int sglen = sg->length;
-	unsigned int sgoffset = sg->offset;
-	unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
-			      PAGE_SHIFT;
-	int i = 1, j = 0;
-
-	if (xferlen < DDP_THRESHOLD) {
-		ddp_log_debug("xfer %u < threshold %u, no ddp.\n",
-			      xferlen, DDP_THRESHOLD);
-		return NULL;
-	}
-
-	gl = kzalloc(sizeof(struct cxgb3i_gather_list) +
-		     npages * (sizeof(dma_addr_t) + sizeof(struct page *)),
-		     gfp);
-	if (!gl)
-		return NULL;
-
-	gl->pages = (struct page **)&gl->phys_addr[npages];
-	gl->length = xferlen;
-	gl->offset = sgoffset;
-	gl->pages[0] = sgpage;
-
-	sg = sg_next(sg);
-	while (sg) {
-		struct page *page = sg_page(sg);
-
-		if (sgpage == page && sg->offset == sgoffset + sglen)
-			sglen += sg->length;
-		else {
-			/* make sure the sgl is fit for ddp:
-			 * each has the same page size, and
-			 * all of the middle pages are used completely
-			 */
-			if ((j && sgoffset) ||
-			    ((i != sgcnt - 1) &&
-			     ((sglen + sgoffset) & ~PAGE_MASK)))
-				goto error_out;
-
-			j++;
-			if (j == gl->nelem || sg->offset)
-				goto error_out;
-			gl->pages[j] = page;
-			sglen = sg->length;
-			sgoffset = sg->offset;
-			sgpage = page;
-		}
-		i++;
-		sg = sg_next(sg);
-	}
-	gl->nelem = ++j;
-
-	if (ddp_gl_map(pdev, gl) < 0)
-		goto error_out;
-
-	return gl;
-
-error_out:
-	kfree(gl);
-	return NULL;
-}
-
-/**
- * cxgb3i_ddp_release_gl - release a page buffer list
- * @gl: a ddp page buffer list
- * @pdev: pci_dev used for pci_unmap
- * free a ddp page buffer list resulted from cxgb3i_ddp_make_gl().
- */
-void cxgb3i_ddp_release_gl(struct cxgb3i_gather_list *gl,
-			   struct pci_dev *pdev)
-{
-	ddp_gl_unmap(pdev, gl);
-	kfree(gl);
-}
-
-/**
- * cxgb3i_ddp_tag_reserve - set up ddp for a data transfer
- * @tdev: t3cdev adapter
- * @tid: connection id
- * @tformat: tag format
- * @tagp: contains s/w tag initially, will be updated with ddp/hw tag
- * @gl: the page momory list
- * @gfp: allocation mode
- *
- * ddp setup for a given page buffer list and construct the ddp tag.
- * return 0 if success, < 0 otherwise.
- */
-int cxgb3i_ddp_tag_reserve(struct t3cdev *tdev, unsigned int tid,
-			   struct cxgb3i_tag_format *tformat, u32 *tagp,
-			   struct cxgb3i_gather_list *gl, gfp_t gfp)
-{
-	struct cxgb3i_ddp_info *ddp = tdev->ulp_iscsi;
-	struct pagepod_hdr hdr;
-	unsigned int npods;
-	int idx = -1;
-	int err = -ENOMEM;
-	u32 sw_tag = *tagp;
-	u32 tag;
-
-	if (page_idx >= DDP_PGIDX_MAX || !ddp || !gl || !gl->nelem ||
-		gl->length < DDP_THRESHOLD) {
-		ddp_log_debug("pgidx %u, xfer %u/%u, NO ddp.\n",
-			      page_idx, gl->length, DDP_THRESHOLD);
-		return -EINVAL;
-	}
-
-	npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
-
-	if (ddp->idx_last == ddp->nppods)
-		idx = ddp_find_unused_entries(ddp, 0, ddp->nppods, npods, gl);
-	else {
-		idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
-					      ddp->nppods, npods, gl);
-		if (idx < 0 && ddp->idx_last >= npods) {
-			idx = ddp_find_unused_entries(ddp, 0,
-				min(ddp->idx_last + npods, ddp->nppods),
-						      npods, gl);
-		}
-	}
-	if (idx < 0) {
-		ddp_log_debug("xferlen %u, gl %u, npods %u NO DDP.\n",
-			      gl->length, gl->nelem, npods);
-		return idx;
-	}
-
-	err = ddp_alloc_gl_skb(ddp, idx, npods, gfp);
-	if (err < 0)
-		goto unmark_entries;
-
-	tag = cxgb3i_ddp_tag_base(tformat, sw_tag);
-	tag |= idx << PPOD_IDX_SHIFT;
-
-	hdr.rsvd = 0;
-	hdr.vld_tid = htonl(F_PPOD_VALID | V_PPOD_TID(tid));
-	hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
-	hdr.maxoffset = htonl(gl->length);
-	hdr.pgoffset = htonl(gl->offset);
-
-	err = set_ddp_map(ddp, &hdr, idx, npods, gl);
-	if (err < 0)
-		goto free_gl_skb;
-
-	ddp->idx_last = idx;
-	ddp_log_debug("xfer %u, gl %u,%u, tid 0x%x, 0x%x -> 0x%x(%u,%u).\n",
-		      gl->length, gl->nelem, gl->offset, tid, sw_tag, tag,
-		      idx, npods);
-	*tagp = tag;
-	return 0;
-
-free_gl_skb:
-	ddp_free_gl_skb(ddp, idx, npods);
-unmark_entries:
-	ddp_unmark_entries(ddp, idx, npods);
-	return err;
-}
-
-/**
- * cxgb3i_ddp_tag_release - release a ddp tag
- * @tdev: t3cdev adapter
- * @tag: ddp tag
- * ddp cleanup for a given ddp tag and release all the resources held
- */
-void cxgb3i_ddp_tag_release(struct t3cdev *tdev, u32 tag)
-{
-	struct cxgb3i_ddp_info *ddp = tdev->ulp_iscsi;
-	u32 idx;
-
-	if (!ddp) {
-		ddp_log_error("release ddp tag 0x%x, ddp NULL.\n", tag);
-		return;
-	}
-
-	idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
-	if (idx < ddp->nppods) {
-		struct cxgb3i_gather_list *gl = ddp->gl_map[idx];
-		unsigned int npods;
-
-		if (!gl || !gl->nelem) {
-			ddp_log_error("release 0x%x, idx 0x%x, gl 0x%p, %u.\n",
-				      tag, idx, gl, gl ? gl->nelem : 0);
-			return;
-		}
-		npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
-		ddp_log_debug("ddp tag 0x%x, release idx 0x%x, npods %u.\n",
-			      tag, idx, npods);
-		clear_ddp_map(ddp, tag, idx, npods);
-		ddp_unmark_entries(ddp, idx, npods);
-		cxgb3i_ddp_release_gl(gl, ddp->pdev);
-	} else
-		ddp_log_error("ddp tag 0x%x, idx 0x%x > max 0x%x.\n",
-			      tag, idx, ddp->nppods);
-}
-
-static int setup_conn_pgidx(struct t3cdev *tdev, unsigned int tid, int pg_idx,
-			    int reply)
-{
-	struct sk_buff *skb = alloc_skb(sizeof(struct cpl_set_tcb_field),
-					GFP_KERNEL);
-	struct cpl_set_tcb_field *req;
-	u64 val = pg_idx < DDP_PGIDX_MAX ? pg_idx : 0;
-
-	if (!skb)
-		return -ENOMEM;
-
-	/* set up ulp submode and page size */
-	req = (struct cpl_set_tcb_field *)skb_put(skb, sizeof(*req));
-	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
-	req->wr.wr_lo = 0;
-	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
-	req->reply = V_NO_REPLY(reply ? 0 : 1);
-	req->cpu_idx = 0;
-	req->word = htons(31);
-	req->mask = cpu_to_be64(0xF0000000);
-	req->val = cpu_to_be64(val << 28);
-	skb->priority = CPL_PRIORITY_CONTROL;
-
-	cxgb3_ofld_send(tdev, skb);
-	return 0;
-}
-
-/**
- * cxgb3i_setup_conn_host_pagesize - setup the conn.'s ddp page size
- * @tdev: t3cdev adapter
- * @tid: connection id
- * @reply: request reply from h/w
- * set up the ddp page size based on the host PAGE_SIZE for a connection
- * identified by tid
- */
-int cxgb3i_setup_conn_host_pagesize(struct t3cdev *tdev, unsigned int tid,
-				    int reply)
-{
-	return setup_conn_pgidx(tdev, tid, page_idx, reply);
-}
-
-/**
- * cxgb3i_setup_conn_pagesize - setup the conn.'s ddp page size
- * @tdev: t3cdev adapter
- * @tid: connection id
- * @reply: request reply from h/w
- * @pgsz: ddp page size
- * set up the ddp page size for a connection identified by tid
- */
-int cxgb3i_setup_conn_pagesize(struct t3cdev *tdev, unsigned int tid,
-				int reply, unsigned long pgsz)
-{
-	int pgidx = cxgb3i_ddp_find_page_index(pgsz);
-
-	return setup_conn_pgidx(tdev, tid, pgidx, reply);
-}
-
-/**
- * cxgb3i_setup_conn_digest - setup conn. digest setting
- * @tdev: t3cdev adapter
- * @tid: connection id
- * @hcrc: header digest enabled
- * @dcrc: data digest enabled
- * @reply: request reply from h/w
- * set up the iscsi digest settings for a connection identified by tid
- */
-int cxgb3i_setup_conn_digest(struct t3cdev *tdev, unsigned int tid,
-			     int hcrc, int dcrc, int reply)
-{
-	struct sk_buff *skb = alloc_skb(sizeof(struct cpl_set_tcb_field),
-					GFP_KERNEL);
-	struct cpl_set_tcb_field *req;
-	u64 val = (hcrc ? 1 : 0) | (dcrc ? 2 : 0);
-
-	if (!skb)
-		return -ENOMEM;
-
-	/* set up ulp submode and page size */
-	req = (struct cpl_set_tcb_field *)skb_put(skb, sizeof(*req));
-	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
-	req->wr.wr_lo = 0;
-	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
-	req->reply = V_NO_REPLY(reply ? 0 : 1);
-	req->cpu_idx = 0;
-	req->word = htons(31);
-	req->mask = cpu_to_be64(0x0F000000);
-	req->val = cpu_to_be64(val << 24);
-	skb->priority = CPL_PRIORITY_CONTROL;
-
-	cxgb3_ofld_send(tdev, skb);
-	return 0;
-}
-
-
-/**
- * cxgb3i_adapter_ddp_info - read the adapter's ddp information
- * @tdev: t3cdev adapter
- * @tformat: tag format
- * @txsz: max tx pdu payload size, filled in by this func.
- * @rxsz: max rx pdu payload size, filled in by this func.
- * setup the tag format for a given iscsi entity
- */
-int cxgb3i_adapter_ddp_info(struct t3cdev *tdev,
-			    struct cxgb3i_tag_format *tformat,
-			    unsigned int *txsz, unsigned int *rxsz)
-{
-	struct cxgb3i_ddp_info *ddp;
-	unsigned char idx_bits;
-
-	if (!tformat)
-		return -EINVAL;
-
-	if (!tdev->ulp_iscsi)
-		return -EINVAL;
-
-	ddp = (struct cxgb3i_ddp_info *)tdev->ulp_iscsi;
-
-	idx_bits = 32 - tformat->sw_bits;
-	tformat->rsvd_bits = ddp->idx_bits;
-	tformat->rsvd_shift = PPOD_IDX_SHIFT;
-	tformat->rsvd_mask = (1 << tformat->rsvd_bits) - 1;
-
-	ddp_log_info("tag format: sw %u, rsvd %u,%u, mask 0x%x.\n",
-		      tformat->sw_bits, tformat->rsvd_bits,
-		      tformat->rsvd_shift, tformat->rsvd_mask);
-
-	*txsz = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
-			ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
-	*rxsz = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
-			ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
-	ddp_log_info("max payload size: %u/%u, %u/%u.\n",
-		     *txsz, ddp->max_txsz, *rxsz, ddp->max_rxsz);
-	return 0;
-}
-
-/**
- * cxgb3i_ddp_cleanup - release the cxgb3 adapter's ddp resource
- * @tdev: t3cdev adapter
- * release all the resource held by the ddp pagepod manager for a given
- * adapter if needed
- */
-
-static void ddp_cleanup(struct kref *kref)
-{
-	struct cxgb3i_ddp_info *ddp = container_of(kref,
-						struct cxgb3i_ddp_info,
-						refcnt);
-	int i = 0;
-
-	ddp_log_info("kref release ddp 0x%p, t3dev 0x%p.\n", ddp, ddp->tdev);
-
-	ddp->tdev->ulp_iscsi = NULL;
-	while (i < ddp->nppods) {
-		struct cxgb3i_gather_list *gl = ddp->gl_map[i];
-		if (gl) {
-			int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
-					>> PPOD_PAGES_SHIFT;
-			ddp_log_info("t3dev 0x%p, ddp %d + %d.\n",
-					ddp->tdev, i, npods);
-			kfree(gl);
-			ddp_free_gl_skb(ddp, i, npods);
-			i += npods;
-		} else
-			i++;
-	}
-	cxgb3i_free_big_mem(ddp);
-}
-
-void cxgb3i_ddp_cleanup(struct t3cdev *tdev)
-{
-	struct cxgb3i_ddp_info *ddp = (struct cxgb3i_ddp_info *)tdev->ulp_iscsi;
-
-	ddp_log_info("t3dev 0x%p, release ddp 0x%p.\n", tdev, ddp);
-	if (ddp)
-		kref_put(&ddp->refcnt, ddp_cleanup);
-}
-
-/**
- * ddp_init - initialize the cxgb3 adapter's ddp resource
- * @tdev: t3cdev adapter
- * initialize the ddp pagepod manager for a given adapter
- */
-static void ddp_init(struct t3cdev *tdev)
-{
-	struct cxgb3i_ddp_info *ddp = tdev->ulp_iscsi;
-	struct ulp_iscsi_info uinfo;
-	unsigned int ppmax, bits;
-	int i, err;
-
-	if (ddp) {
-		kref_get(&ddp->refcnt);
-		ddp_log_warn("t3dev 0x%p, ddp 0x%p already set up.\n",
-				tdev, tdev->ulp_iscsi);
-		return;
-	}
-
-	err = tdev->ctl(tdev, ULP_ISCSI_GET_PARAMS, &uinfo);
-	if (err < 0) {
-		ddp_log_error("%s, failed to get iscsi param err=%d.\n",
-				 tdev->name, err);
-		return;
-	}
-
-	ppmax = (uinfo.ulimit - uinfo.llimit + 1) >> PPOD_SIZE_SHIFT;
-	bits = __ilog2_u32(ppmax) + 1;
-	if (bits > PPOD_IDX_MAX_SIZE)
-		bits = PPOD_IDX_MAX_SIZE;
-	ppmax = (1 << (bits - 1)) - 1;
-
-	ddp = cxgb3i_alloc_big_mem(sizeof(struct cxgb3i_ddp_info) +
-				   ppmax *
-					(sizeof(struct cxgb3i_gather_list *) +
-					sizeof(struct sk_buff *)),
-				   GFP_KERNEL);
-	if (!ddp) {
-		ddp_log_warn("%s unable to alloc ddp 0x%d, ddp disabled.\n",
-			     tdev->name, ppmax);
-		return;
-	}
-	ddp->gl_map = (struct cxgb3i_gather_list **)(ddp + 1);
-	ddp->gl_skb = (struct sk_buff **)(((char *)ddp->gl_map) +
-					  ppmax *
-					  sizeof(struct cxgb3i_gather_list *));
-	spin_lock_init(&ddp->map_lock);
-	kref_init(&ddp->refcnt);
-
-	ddp->tdev = tdev;
-	ddp->pdev = uinfo.pdev;
-	ddp->max_txsz = min_t(unsigned int, uinfo.max_txsz, ULP2_MAX_PKT_SIZE);
-	ddp->max_rxsz = min_t(unsigned int, uinfo.max_rxsz, ULP2_MAX_PKT_SIZE);
-	ddp->llimit = uinfo.llimit;
-	ddp->ulimit = uinfo.ulimit;
-	ddp->nppods = ppmax;
-	ddp->idx_last = ppmax;
-	ddp->idx_bits = bits;
-	ddp->idx_mask = (1 << bits) - 1;
-	ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
-
-	uinfo.tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
-	for (i = 0; i < DDP_PGIDX_MAX; i++)
-		uinfo.pgsz_factor[i] = ddp_page_order[i];
-	uinfo.ulimit = uinfo.llimit + (ppmax << PPOD_SIZE_SHIFT);
-
-	err = tdev->ctl(tdev, ULP_ISCSI_SET_PARAMS, &uinfo);
-	if (err < 0) {
-		ddp_log_warn("%s unable to set iscsi param err=%d, "
-			      "ddp disabled.\n", tdev->name, err);
-		goto free_ddp_map;
-	}
-
-	tdev->ulp_iscsi = ddp;
-
-	ddp_log_info("tdev 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u,"
-			" %u/%u.\n",
-			tdev, ppmax, ddp->idx_bits, ddp->idx_mask,
-			ddp->rsvd_tag_mask, ddp->max_txsz, uinfo.max_txsz,
-			ddp->max_rxsz, uinfo.max_rxsz);
-	return;
-
-free_ddp_map:
-	cxgb3i_free_big_mem(ddp);
-}
-
-/**
- * cxgb3i_ddp_init - initialize ddp functions
- */
-void cxgb3i_ddp_init(struct t3cdev *tdev)
-{
-	if (page_idx == DDP_PGIDX_MAX) {
-		page_idx = cxgb3i_ddp_find_page_index(PAGE_SIZE);
-
-		if (page_idx == DDP_PGIDX_MAX) {
-			ddp_log_info("system PAGE_SIZE %lu, update hw.\n",
-					PAGE_SIZE);
-			if (cxgb3i_ddp_adjust_page_table() < 0) {
-				ddp_log_info("PAGE_SIZE %lu, ddp disabled.\n",
-						PAGE_SIZE);
-				return;
-			}
-			page_idx = cxgb3i_ddp_find_page_index(PAGE_SIZE);
-		}
-		ddp_log_info("system PAGE_SIZE %lu, ddp idx %u.\n",
-				PAGE_SIZE, page_idx);
-	}
-	ddp_init(tdev);
-}

drivers/scsi/cxgb3i/cxgb3i_ddp.h

···
-/*
- * cxgb3i_ddp.h: Chelsio S3xx iSCSI DDP Manager.
- *
- * Copyright (c) 2008 Chelsio Communications, Inc.
- *
- * 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.
- *
- * Written by: Karen Xie ([e-mail])
- */
-
-#ifndef __CXGB3I_ULP2_DDP_H__
-#define __CXGB3I_ULP2_DDP_H__
-
-#include <linux/slab.h>
-#include <linux/vmalloc.h>
-
-/**
- * struct cxgb3i_tag_format - cxgb3i ulp tag format for an iscsi entity
- *
- * @sw_bits:	# of bits used by iscsi software layer
- * @rsvd_bits:	# of bits used by h/w
- * @rsvd_shift:	h/w bits shift left
- * @rsvd_mask:	reserved bit mask
- */
-struct cxgb3i_tag_format {
-	unsigned char sw_bits;
-	unsigned char rsvd_bits;
-	unsigned char rsvd_shift;
-	unsigned char filler[1];
-	u32 rsvd_mask;
-};
-
-/**
- * struct cxgb3i_gather_list - cxgb3i direct data placement memory
- *
- * @tag:	ddp tag
- * @length:	total data buffer length
- * @offset:	initial offset to the 1st page
- * @nelem:	# of pages
- * @pages:	page pointers
- * @phys_addr:	physical address
- */
-struct cxgb3i_gather_list {
-	u32 tag;
-	unsigned int length;
-	unsigned int offset;
-	unsigned int nelem;
-	struct page **pages;
-	dma_addr_t phys_addr[0];
-};
-
-/**
- * struct cxgb3i_ddp_info - cxgb3i direct data placement for pdu payload
- *
- * @list:	list head to link elements
- * @refcnt:	ref. count
- * @tdev:	pointer to t3cdev used by cxgb3 driver
- * @max_txsz:	max tx packet size for ddp
- * @max_rxsz:	max rx packet size for ddp
- * @llimit:	lower bound of the page pod memory
- * @ulimit:	upper bound of the page pod memory
- * @nppods:	# of page pod entries
- * @idx_last:	page pod entry last used
- * @idx_bits:	# of bits the pagepod index would take
- * @idx_mask:	pagepod index mask
- * @rsvd_tag_mask: tag mask
- * @map_lock:	lock to synchonize access to the page pod map
- * @gl_map:	ddp memory gather list
- * @gl_skb:	skb used to program the pagepod
- */
-struct cxgb3i_ddp_info {
-	struct list_head list;
-	struct kref refcnt;
-	struct t3cdev *tdev;
-	struct pci_dev *pdev;
-	unsigned int max_txsz;
-	unsigned int max_rxsz;
-	unsigned int llimit;
-	unsigned int ulimit;
-	unsigned int nppods;
-	unsigned int idx_last;
-	unsigned char idx_bits;
-	unsigned char filler[3];
-	u32 idx_mask;
-	u32 rsvd_tag_mask;
-	spinlock_t map_lock;
-	struct cxgb3i_gather_list **gl_map;
-	struct sk_buff **gl_skb;
-};
-
-#define ISCSI_PDU_NONPAYLOAD_LEN	312 /* bhs(48) + ahs(256) + digest(8) */
-#define ULP2_MAX_PKT_SIZE	16224
-#define ULP2_MAX_PDU_PAYLOAD	(ULP2_MAX_PKT_SIZE - ISCSI_PDU_NONPAYLOAD_LEN)
-#define PPOD_PAGES_MAX		4
-#define PPOD_PAGES_SHIFT	2	/* 4 pages per pod */
-
-/*
- * struct pagepod_hdr, pagepod - pagepod format
- */
-struct pagepod_hdr {
-	u32 vld_tid;
-	u32 pgsz_tag_clr;
-	u32 maxoffset;
-	u32 pgoffset;
-	u64 rsvd;
-};
-
-struct pagepod {
-	struct pagepod_hdr hdr;
-	u64 addr[PPOD_PAGES_MAX + 1];
-};
-
-#define PPOD_SIZE		sizeof(struct pagepod)	/* 64 */
-#define PPOD_SIZE_SHIFT		6
-
-#define PPOD_COLOR_SHIFT	0
-#define PPOD_COLOR_SIZE		6
-#define PPOD_COLOR_MASK		((1 << PPOD_COLOR_SIZE) - 1)
-
-#define PPOD_IDX_SHIFT		PPOD_COLOR_SIZE
-#define PPOD_IDX_MAX_SIZE	24
-
-#define S_PPOD_TID    0
-#define M_PPOD_TID    0xFFFFFF
-#define V_PPOD_TID(x) ((x) << S_PPOD_TID)
-
-#define S_PPOD_VALID    24
-#define V_PPOD_VALID(x) ((x) << S_PPOD_VALID)
-#define F_PPOD_VALID    V_PPOD_VALID(1U)
-
-#define S_PPOD_COLOR    0
-#define M_PPOD_COLOR    0x3F
-#define V_PPOD_COLOR(x) ((x) << S_PPOD_COLOR)
-
-#define S_PPOD_TAG    6
-#define M_PPOD_TAG    0xFFFFFF
-#define V_PPOD_TAG(x) ((x) << S_PPOD_TAG)
-
-#define S_PPOD_PGSZ    30
-#define M_PPOD_PGSZ    0x3
-#define V_PPOD_PGSZ(x) ((x) << S_PPOD_PGSZ)
-
-/*
- * large memory chunk allocation/release
- * use vmalloc() if kmalloc() fails
- */
-static inline void *cxgb3i_alloc_big_mem(unsigned int size,
-					 gfp_t gfp)
-{
-	void *p = kmalloc(size, gfp);
-	if (!p)
-		p = vmalloc(size);
-	if (p)
-		memset(p, 0, size);
-	return p;
-}
-
-static inline void cxgb3i_free_big_mem(void *addr)
-{
-	if (is_vmalloc_addr(addr))
-		vfree(addr);
-	else
-		kfree(addr);
-}
-
-/*
- * cxgb3i ddp tag are 32 bits, it consists of reserved bits used by h/w and
- * non-reserved bits that can be used by the iscsi s/w.
- * The reserved bits are identified by the rsvd_bits and rsvd_shift fields
- * in struct cxgb3i_tag_format.
- *
- * The upper most reserved bit can be used to check if a tag is ddp tag or not:
- * 	if the bit is 0, the tag is a valid ddp tag
- */
-
-/**
- * cxgb3i_is_ddp_tag - check if a given tag is a hw/ddp tag
- * @tformat: tag format information
- * @tag: tag to be checked
- *
- * return true if the tag is a ddp tag, false otherwise.
- */
-static inline int cxgb3i_is_ddp_tag(struct cxgb3i_tag_format *tformat, u32 tag)
-{
-	return !(tag & (1 << (tformat->rsvd_bits + tformat->rsvd_shift - 1)));
-}
-
-/**
- * cxgb3i_sw_tag_usable - check if s/w tag has enough bits left for hw bits
- * @tformat: tag format information
- * @sw_tag: s/w tag to be checked
- *
- * return true if the tag can be used for hw ddp tag, false otherwise.
- */
-static inline int cxgb3i_sw_tag_usable(struct cxgb3i_tag_format *tformat,
-					u32 sw_tag)
-{
-	sw_tag >>= (32 - tformat->rsvd_bits);
-	return !sw_tag;
-}
-
-/**
- * cxgb3i_set_non_ddp_tag - mark a given s/w tag as an invalid ddp tag
- * @tformat: tag format information
- * @sw_tag: s/w tag to be checked
- *
- * insert 1 at the upper most reserved bit to mark it as an invalid ddp tag.
- */
-static inline u32 cxgb3i_set_non_ddp_tag(struct cxgb3i_tag_format *tformat,
-					 u32 sw_tag)
-{
-	unsigned char shift = tformat->rsvd_bits + tformat->rsvd_shift - 1;
-	u32 mask = (1 << shift) - 1;
-
-	if (sw_tag && (sw_tag & ~mask)) {
-		u32 v1 = sw_tag & ((1 << shift) - 1);
-		u32 v2 = (sw_tag >> (shift - 1)) << shift;
-
-		return v2 | v1 | 1 << shift;
-	}
-	return sw_tag | 1 << shift;
-}
-
-/**
- * cxgb3i_ddp_tag_base - shift s/w tag bits so that reserved bits are not used
- * @tformat: tag format information
- * @sw_tag: s/w tag to be checked
- */
-static inline u32 cxgb3i_ddp_tag_base(struct cxgb3i_tag_format *tformat,
-				      u32 sw_tag)
-{
-	u32 mask = (1 << tformat->rsvd_shift) - 1;
-
-	if (sw_tag && (sw_tag & ~mask)) {
-		u32 v1 = sw_tag & mask;
-		u32 v2 = sw_tag >> tformat->rsvd_shift;
-
-		v2 <<= tformat->rsvd_shift + tformat->rsvd_bits;
-		return v2 | v1;
-	}
-	return sw_tag;
-}
-
-/**
- * cxgb3i_tag_rsvd_bits - get the reserved bits used by the h/w
- * @tformat: tag format information
- * @tag: tag to be checked
- *
- * return the reserved bits in the tag
- */
-static inline u32 cxgb3i_tag_rsvd_bits(struct cxgb3i_tag_format *tformat,
-				       u32 tag)
-{
-	if (cxgb3i_is_ddp_tag(tformat, tag))
-		return (tag >> tformat->rsvd_shift) & tformat->rsvd_mask;
-	return 0;
-}
-
-/**
- * cxgb3i_tag_nonrsvd_bits - get the non-reserved bits used by the s/w
- * @tformat: tag format information
- * @tag: tag to be checked
- *
- * return the non-reserved bits in the tag.
- */
-static inline u32 cxgb3i_tag_nonrsvd_bits(struct cxgb3i_tag_format *tformat,
-					  u32 tag)
-{
-	unsigned char shift = tformat->rsvd_bits + tformat->rsvd_shift - 1;
-	u32 v1, v2;
-
-	if (cxgb3i_is_ddp_tag(tformat, tag)) {
-		v1 = tag & ((1 << tformat->rsvd_shift) - 1);
-		v2 = (tag >> (shift + 1)) << tformat->rsvd_shift;
-	} else {
-		u32 mask = (1 << shift) - 1;
-
-		tag &= ~(1 << shift);
-		v1 = tag & mask;
-		v2 = (tag >> 1) & ~mask;
-	}
-	return v1 | v2;
-}
-
-int cxgb3i_ddp_tag_reserve(struct t3cdev *, unsigned int tid,
-			   struct cxgb3i_tag_format *, u32 *tag,
-			   struct cxgb3i_gather_list *, gfp_t gfp);
-void cxgb3i_ddp_tag_release(struct t3cdev *, u32 tag);
-
-struct cxgb3i_gather_list *cxgb3i_ddp_make_gl(unsigned int xferlen,
-				struct scatterlist *sgl,
-				unsigned int sgcnt,
-				struct pci_dev *pdev,
-				gfp_t gfp);
-void cxgb3i_ddp_release_gl(struct cxgb3i_gather_list *gl,
-				struct pci_dev *pdev);
-
-int cxgb3i_setup_conn_host_pagesize(struct t3cdev *, unsigned int tid,
-				    int reply);
-int cxgb3i_setup_conn_pagesize(struct t3cdev *, unsigned int tid, int reply,
-			       unsigned long pgsz);
-int cxgb3i_setup_conn_digest(struct t3cdev *, unsigned int tid,
-				int hcrc, int dcrc, int reply);
-int cxgb3i_ddp_find_page_index(unsigned long pgsz);
-int cxgb3i_adapter_ddp_info(struct t3cdev *, struct cxgb3i_tag_format *,
-			    unsigned int *txsz, unsigned int *rxsz);
-
-void cxgb3i_ddp_init(struct t3cdev *);
-void cxgb3i_ddp_cleanup(struct t3cdev *);
-#endif

drivers/scsi/cxgb3i/cxgb3i_init.c

···
-/* cxgb3i_init.c: Chelsio S3xx iSCSI driver.
- *
- * Copyright (c) 2008 Chelsio Communications, Inc.
- *
- * 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.
- *
- * Written by: Karen Xie ([e-mail])
- */
-
-#include "cxgb3i.h"
-
-#define DRV_MODULE_NAME         "cxgb3i"
-#define DRV_MODULE_VERSION	"1.0.2"
-#define DRV_MODULE_RELDATE	"Mar. 2009"
-
-static char version[] =
-	"Chelsio S3xx iSCSI Driver " DRV_MODULE_NAME
-	" v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
-
-MODULE_AUTHOR("Karen Xie <[e-mail]>");
-MODULE_DESCRIPTION("Chelsio S3xx iSCSI Driver");
-MODULE_LICENSE("GPL");
-MODULE_VERSION(DRV_MODULE_VERSION);
-
-static void open_s3_dev(struct t3cdev *);
-static void close_s3_dev(struct t3cdev *);
-static void s3_event_handler(struct t3cdev *tdev, u32 event, u32 port);
-
-static cxgb3_cpl_handler_func cxgb3i_cpl_handlers[NUM_CPL_CMDS];
-static struct cxgb3_client t3c_client = {
-	.name = "iscsi_cxgb3",
-	.handlers = cxgb3i_cpl_handlers,
-	.add = open_s3_dev,
-	.remove = close_s3_dev,
-	.event_handler = s3_event_handler,
-};
-
-/**
- * open_s3_dev - register with cxgb3 LLD
- * @t3dev:	cxgb3 adapter instance
- */
-static void open_s3_dev(struct t3cdev *t3dev)
-{
-	static int vers_printed;
-
-	if (!vers_printed) {
-		printk(KERN_INFO "%s", version);
-		vers_printed = 1;
-	}
-
-	cxgb3i_ddp_init(t3dev);
-	cxgb3i_sdev_add(t3dev, &t3c_client);
-	cxgb3i_adapter_open(t3dev);
-}
-
-/**
- * close_s3_dev - de-register with cxgb3 LLD
- * @t3dev:	cxgb3 adapter instance
- */
-static void close_s3_dev(struct t3cdev *t3dev)
-{
-	cxgb3i_adapter_close(t3dev);
-	cxgb3i_sdev_remove(t3dev);
-	cxgb3i_ddp_cleanup(t3dev);
-}
-
-static void s3_event_handler(struct t3cdev *tdev, u32 event, u32 port)
-{
-	struct cxgb3i_adapter *snic = cxgb3i_adapter_find_by_tdev(tdev);
-
-	cxgb3i_log_info("snic 0x%p, tdev 0x%p, event 0x%x, port 0x%x.\n",
-			snic, tdev, event, port);
-	if (!snic)
-		return;
-
-	switch (event) {
-	case OFFLOAD_STATUS_DOWN:
-		snic->flags |= CXGB3I_ADAPTER_FLAG_RESET;
-		break;
-	case OFFLOAD_STATUS_UP:
-		snic->flags &= ~CXGB3I_ADAPTER_FLAG_RESET;
-		break;
-	}
-}
-
-/**
- * cxgb3i_init_module - module init entry point
- *
- * initialize any driver wide global data structures and register itself
- *	with the cxgb3 module
- */
-static int __init cxgb3i_init_module(void)
-{
-	int err;
-
-	err = cxgb3i_sdev_init(cxgb3i_cpl_handlers);
-	if (err < 0)
-		return err;
-
-	err = cxgb3i_iscsi_init();
-	if (err < 0)
-		return err;
-
-	err = cxgb3i_pdu_init();
-	if (err < 0) {
-		cxgb3i_iscsi_cleanup();
-		return err;
-	}
-
-	cxgb3_register_client(&t3c_client);
-
-	return 0;
-}
-
-/**
- * cxgb3i_exit_module - module cleanup/exit entry point
- *
- * go through the driver hba list and for each hba, release any resource held.
- *	and unregisters iscsi transport and the cxgb3 module
- */
-static void __exit cxgb3i_exit_module(void)
-{
-	cxgb3_unregister_client(&t3c_client);
-	cxgb3i_pdu_cleanup();
-	cxgb3i_iscsi_cleanup();
-	cxgb3i_sdev_cleanup();
-}
-
-module_init(cxgb3i_init_module);
-module_exit(cxgb3i_exit_module);

drivers/scsi/cxgb3i/cxgb3i_iscsi.c

···
-/* cxgb3i_iscsi.c: Chelsio S3xx iSCSI driver.
- *
- * Copyright (c) 2008 Chelsio Communications, Inc.
- * Copyright (c) 2008 Mike Christie
- * Copyright (c) 2008 Red Hat, Inc.  All rights reserved.
- *
- * 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.
- *
- * Written by: Karen Xie ([e-mail])
- */
-
-#include <linux/inet.h>
-#include <linux/slab.h>
-#include <linux/crypto.h>
-#include <linux/if_vlan.h>
-#include <net/dst.h>
-#include <net/tcp.h>
-#include <scsi/scsi_cmnd.h>
-#include <scsi/scsi_device.h>
-#include <scsi/scsi_eh.h>
-#include <scsi/scsi_host.h>
-#include <scsi/scsi.h>
-#include <scsi/iscsi_proto.h>
-#include <scsi/libiscsi.h>
-#include <scsi/scsi_transport_iscsi.h>
-
-#include "cxgb3i.h"
-#include "cxgb3i_pdu.h"
-
-#ifdef __DEBUG_CXGB3I_TAG__
-#define cxgb3i_tag_debug	cxgb3i_log_debug
-#else
-#define cxgb3i_tag_debug(fmt...)
-#endif
-
-#ifdef __DEBUG_CXGB3I_API__
-#define cxgb3i_api_debug	cxgb3i_log_debug
-#else
-#define cxgb3i_api_debug(fmt...)
-#endif
-
-/*
- * align pdu size to multiple of 512 for better performance
- */
-#define align_pdu_size(n) do { n = (n) & (~511); } while (0)
-
-static struct scsi_transport_template *cxgb3i_scsi_transport;
-static struct scsi_host_template cxgb3i_host_template;
-static struct iscsi_transport cxgb3i_iscsi_transport;
-static unsigned char sw_tag_idx_bits;
-static unsigned char sw_tag_age_bits;
-
-static LIST_HEAD(cxgb3i_snic_list);
-static DEFINE_RWLOCK(cxgb3i_snic_rwlock);
-
-/**
- * cxgb3i_adpater_find_by_tdev - find the cxgb3i_adapter structure via t3cdev
- * @tdev: t3cdev pointer
- */
-struct cxgb3i_adapter *cxgb3i_adapter_find_by_tdev(struct t3cdev *tdev)
-{
-	struct cxgb3i_adapter *snic;
-
-	read_lock(&cxgb3i_snic_rwlock);
-	list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
-		if (snic->tdev == tdev) {
-			read_unlock(&cxgb3i_snic_rwlock);
-			return snic;
-		}
-	}
-	read_unlock(&cxgb3i_snic_rwlock);
-	return NULL;
-}
-
-static inline int adapter_update(struct cxgb3i_adapter *snic)
-{
-	cxgb3i_log_info("snic 0x%p, t3dev 0x%p, updating.\n",
-			snic, snic->tdev);
-	return cxgb3i_adapter_ddp_info(snic->tdev, &snic->tag_format,
-					&snic->tx_max_size,
-					&snic->rx_max_size);
-}
-
-static int adapter_add(struct cxgb3i_adapter *snic)
-{
-	struct t3cdev *t3dev = snic->tdev;
-	struct adapter *adapter = tdev2adap(t3dev);
-	int i, err;
-
-	snic->pdev = adapter->pdev;
-	snic->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
-
-	err = cxgb3i_adapter_ddp_info(t3dev, &snic->tag_format,
-				    &snic->tx_max_size,
-				    &snic->rx_max_size);
-	if (err < 0)
-		return err;
-
-	for_each_port(adapter, i) {
-		snic->hba[i] = cxgb3i_hba_host_add(snic, adapter->port[i]);
-		if (!snic->hba[i])
-			return -EINVAL;
-	}
-	snic->hba_cnt = adapter->params.nports;
-
-	/* add to the list */
-	write_lock(&cxgb3i_snic_rwlock);
-	list_add_tail(&snic->list_head, &cxgb3i_snic_list);
-	write_unlock(&cxgb3i_snic_rwlock);
-
-	cxgb3i_log_info("t3dev 0x%p open, snic 0x%p, %u scsi hosts added.\n",
-			t3dev, snic, snic->hba_cnt);
-	return 0;
-}
-
-/**
- * cxgb3i_adapter_open - init a s3 adapter structure and any h/w settings
- * @t3dev: t3cdev adapter
- */
-void cxgb3i_adapter_open(struct t3cdev *t3dev)
-{
-	struct cxgb3i_adapter *snic = cxgb3i_adapter_find_by_tdev(t3dev);
-	int err;
-
-	if (snic)
-		err = adapter_update(snic);
-	else {
-		snic = kzalloc(sizeof(*snic), GFP_KERNEL);
-		if (snic) {
-			spin_lock_init(&snic->lock);
-			snic->tdev = t3dev;
-			err = adapter_add(snic);
-		} else
-			err = -ENOMEM;
-	}
-
-	if (err < 0) {
-		cxgb3i_log_info("snic 0x%p, f 0x%x, t3dev 0x%p open, err %d.\n",
-				snic, snic ? snic->flags : 0, t3dev, err);
-		if (snic) {
-			snic->flags &= ~CXGB3I_ADAPTER_FLAG_RESET;
-			cxgb3i_adapter_close(t3dev);
-		}
-	}
-}
-
-/**
- * cxgb3i_adapter_close - release the resources held and cleanup h/w settings
- * @t3dev: t3cdev adapter
- */
-void cxgb3i_adapter_close(struct t3cdev *t3dev)
-{
-	struct cxgb3i_adapter *snic = cxgb3i_adapter_find_by_tdev(t3dev);
-	int i;
-
-	if (!snic || snic->flags & CXGB3I_ADAPTER_FLAG_RESET) {
-		cxgb3i_log_info("t3dev 0x%p close, snic 0x%p, f 0x%x.\n",
-				t3dev, snic, snic ? snic->flags : 0);
-		return;
-	}
-
-	/* remove from the list */
-	write_lock(&cxgb3i_snic_rwlock);
-	list_del(&snic->list_head);
-	write_unlock(&cxgb3i_snic_rwlock);
-
-	for (i = 0; i < snic->hba_cnt; i++) {
-		if (snic->hba[i]) {
-			cxgb3i_hba_host_remove(snic->hba[i]);
-			snic->hba[i] = NULL;
-		}
-	}
-	cxgb3i_log_info("t3dev 0x%p close, snic 0x%p, %u scsi hosts removed.\n",
-			t3dev, snic, snic->hba_cnt);
-	kfree(snic);
-}
-
-/**
- * cxgb3i_hba_find_by_netdev - find the cxgb3i_hba structure via net_device
- * @t3dev: t3cdev adapter
- */
-static struct cxgb3i_hba *cxgb3i_hba_find_by_netdev(struct net_device *ndev)
-{
-	struct cxgb3i_adapter *snic;
-	int i;
-
-	if (ndev->priv_flags & IFF_802_1Q_VLAN)
-		ndev = vlan_dev_real_dev(ndev);
-
-	read_lock(&cxgb3i_snic_rwlock);
-	list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
-		for (i = 0; i < snic->hba_cnt; i++) {
-			if (snic->hba[i]->ndev == ndev) {
-				read_unlock(&cxgb3i_snic_rwlock);
-				return snic->hba[i];
-			}
-		}
-	}
-	read_unlock(&cxgb3i_snic_rwlock);
-	return NULL;
-}
-
-/**
- * cxgb3i_hba_host_add - register a new host with scsi/iscsi
- * @snic: the cxgb3i adapter
- * @ndev: associated net_device
- */
-struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *snic,
-				       struct net_device *ndev)
-{
-	struct cxgb3i_hba *hba;
-	struct Scsi_Host *shost;
-	int err;
-
-	shost = iscsi_host_alloc(&cxgb3i_host_template,
-				 sizeof(struct cxgb3i_hba), 1);
-	if (!shost) {
-		cxgb3i_log_info("snic 0x%p, ndev 0x%p, host_alloc failed.\n",
-				snic, ndev);
-		return NULL;
-	}
-
-	shost->transportt = cxgb3i_scsi_transport;
-	shost->max_lun = CXGB3I_MAX_LUN;
-	shost->max_id = CXGB3I_MAX_TARGET;
-	shost->max_channel = 0;
-	shost->max_cmd_len = 16;
-
-	hba = iscsi_host_priv(shost);
-	hba->snic = snic;
-	hba->ndev = ndev;
-	hba->shost = shost;
-
-	pci_dev_get(snic->pdev);
-	err = iscsi_host_add(shost, &snic->pdev->dev);
-	if (err) {
-		cxgb3i_log_info("snic 0x%p, ndev 0x%p, host_add failed.\n",
-				snic, ndev);
-		goto pci_dev_put;
-	}
-
-	cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
-			 shost, hba, shost->host_no);
-
-	return hba;
-
-pci_dev_put:
-	pci_dev_put(snic->pdev);
-	scsi_host_put(shost);
-	return NULL;
-}
-
-/**
- * cxgb3i_hba_host_remove - de-register the host with scsi/iscsi
- * @hba: the cxgb3i hba
- */
-void cxgb3i_hba_host_remove(struct cxgb3i_hba *hba)
-{
-	cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
-			 hba->shost, hba, hba->shost->host_no);
-	iscsi_host_remove(hba->shost);
-	pci_dev_put(hba->snic->pdev);
-	iscsi_host_free(hba->shost);
-}
-
-/**
- * cxgb3i_ep_connect - establish TCP connection to target portal
- * @shost:		scsi host to use
- * @dst_addr:		target IP address
- * @non_blocking:	blocking or non-blocking call
- *
- * Initiates a TCP/IP connection to the dst_addr
- */
-static struct iscsi_endpoint *cxgb3i_ep_connect(struct Scsi_Host *shost,
-						struct sockaddr *dst_addr,
-						int non_blocking)
-{
-	struct iscsi_endpoint *ep;
-	struct cxgb3i_endpoint *cep;
-	struct cxgb3i_hba *hba = NULL;
-	struct s3_conn *c3cn = NULL;
-	int err = 0;
-
-	if (shost)
-		hba = iscsi_host_priv(shost);
-
-	cxgb3i_api_debug("shost 0x%p, hba 0x%p.\n", shost, hba);
-
-	c3cn = cxgb3i_c3cn_create();
-	if (!c3cn) {
-		cxgb3i_log_info("ep connect OOM.\n");
-		err = -ENOMEM;
-		goto release_conn;
-	}
-
-	err = cxgb3i_c3cn_connect(hba ? hba->ndev : NULL, c3cn,
-				 (struct sockaddr_in *)dst_addr);
-	if (err < 0) {
-		cxgb3i_log_info("ep connect failed.\n");
-		goto release_conn;
-	}
-
-	hba = cxgb3i_hba_find_by_netdev(c3cn->dst_cache->dev);
-	if (!hba) {
-		err = -ENOSPC;
-		cxgb3i_log_info("NOT going through cxgbi device.\n");
-		goto release_conn;
-	}
-
-	if (shost && hba != iscsi_host_priv(shost)) {
-		err = -ENOSPC;
-		cxgb3i_log_info("Could not connect through request host%u\n",
-				shost->host_no);
-		goto release_conn;
-	}
-
-	if (c3cn_is_closing(c3cn)) {
-		err = -ENOSPC;
-		cxgb3i_log_info("ep connect unable to connect.\n");
-		goto release_conn;
-	}
-
-	ep = iscsi_create_endpoint(sizeof(*cep));
-	if (!ep) {
-		err = -ENOMEM;
-		cxgb3i_log_info("iscsi alloc ep, OOM.\n");
-		goto release_conn;
-	}
-	cep = ep->dd_data;
-	cep->c3cn = c3cn;
-	cep->hba = hba;
-
-	cxgb3i_api_debug("ep 0x%p, 0x%p, c3cn 0x%p, hba 0x%p.\n",
-			  ep, cep, c3cn, hba);
-	return ep;
-
-release_conn:
-	cxgb3i_api_debug("conn 0x%p failed, release.\n", c3cn);
-	if (c3cn)
-		cxgb3i_c3cn_release(c3cn);
-	return ERR_PTR(err);
-}
-
-/**
- * cxgb3i_ep_poll - polls for TCP connection establishement
- * @ep:		TCP connection (endpoint) handle
- * @timeout_ms:	timeout value in milli secs
- *
- * polls for TCP connect request to complete
- */
-static int cxgb3i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
-{
-	struct cxgb3i_endpoint *cep = ep->dd_data;
-	struct s3_conn *c3cn = cep->c3cn;
-
-	if (!c3cn_is_established(c3cn))
-		return 0;
-	cxgb3i_api_debug("ep 0x%p, c3cn 0x%p established.\n", ep, c3cn);
-	return 1;
-}
-
-/**
- * cxgb3i_ep_disconnect - teardown TCP connection
- * @ep:		TCP connection (endpoint) handle
- *
- * teardown TCP connection
- */
-static void cxgb3i_ep_disconnect(struct iscsi_endpoint *ep)
-{
-	struct cxgb3i_endpoint *cep = ep->dd_data;
-	struct cxgb3i_conn *cconn = cep->cconn;
-
-	cxgb3i_api_debug("ep 0x%p, cep 0x%p.\n", ep, cep);
-
-	if (cconn && cconn->conn) {
-		/*
-		 * stop the xmit path so the xmit_pdu function is
-		 * not being called
-		 */
-		iscsi_suspend_tx(cconn->conn);
-
-		write_lock_bh(&cep->c3cn->callback_lock);
-		cep->c3cn->user_data = NULL;
-		cconn->cep = NULL;
-		write_unlock_bh(&cep->c3cn->callback_lock);
-	}
-
-	cxgb3i_api_debug("ep 0x%p, cep 0x%p, release c3cn 0x%p.\n",
-			 ep, cep, cep->c3cn);
-	cxgb3i_c3cn_release(cep->c3cn);
-	iscsi_destroy_endpoint(ep);
-}
-
-/**
- * cxgb3i_session_create - create a new iscsi session
- * @cmds_max:		max # of commands
- * @qdepth:		scsi queue depth
- * @initial_cmdsn:	initial iscsi CMDSN for this session
- *
- * Creates a new iSCSI session
- */
-static struct iscsi_cls_session *
-cxgb3i_session_create(struct iscsi_endpoint *ep, u16 cmds_max, u16 qdepth,
-		      u32 initial_cmdsn)
-{
-	struct cxgb3i_endpoint *cep;
-	struct cxgb3i_hba *hba;
-	struct Scsi_Host *shost;
-	struct iscsi_cls_session *cls_session;
-	struct iscsi_session *session;
-
-	if (!ep) {
-		cxgb3i_log_error("%s, missing endpoint.\n", __func__);
-		return NULL;
-	}
-
-	cep = ep->dd_data;
-	hba = cep->hba;
-	shost = hba->shost;
-	cxgb3i_api_debug("ep 0x%p, cep 0x%p, hba 0x%p.\n", ep, cep, hba);
-	BUG_ON(hba != iscsi_host_priv(shost));
-
-	cls_session = iscsi_session_setup(&cxgb3i_iscsi_transport, shost,
-					  cmds_max, 0,
-					  sizeof(struct iscsi_tcp_task) +
-					  sizeof(struct cxgb3i_task_data),
-					  initial_cmdsn, ISCSI_MAX_TARGET);
-	if (!cls_session)
-		return NULL;
-	session = cls_session->dd_data;
-	if (iscsi_tcp_r2tpool_alloc(session))
-		goto remove_session;
-
-	return cls_session;
-
-remove_session:
-	iscsi_session_teardown(cls_session);
-	return NULL;
-}
-
-/**
- * cxgb3i_session_destroy - destroys iscsi session
- * @cls_session:	pointer to iscsi cls session
- *
- * Destroys an iSCSI session instance and releases its all resources held
- */
-static void cxgb3i_session_destroy(struct iscsi_cls_session *cls_session)
-{
-	cxgb3i_api_debug("sess 0x%p.\n", cls_session);
-	iscsi_tcp_r2tpool_free(cls_session->dd_data);
-	iscsi_session_teardown(cls_session);
-}
-
-/**
- * cxgb3i_conn_max_xmit_dlength -- calc the max. xmit pdu segment size
- * @conn: iscsi connection
- * check the max. xmit pdu payload, reduce it if needed
- */
-static inline int cxgb3i_conn_max_xmit_dlength(struct iscsi_conn *conn)
-
-{
-	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
-	struct cxgb3i_conn *cconn = tcp_conn->dd_data;
-	unsigned int max = max(512 * MAX_SKB_FRAGS, SKB_TX_HEADROOM);
-
-	max = min(cconn->hba->snic->tx_max_size, max);
-	if (conn->max_xmit_dlength)
-		conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
-	else
-		conn->max_xmit_dlength = max;
-	align_pdu_size(conn->max_xmit_dlength);
-	cxgb3i_api_debug("conn 0x%p, max xmit %u.\n",
-			 conn, conn->max_xmit_dlength);
-	return 0;
-}
-
-/**
- * cxgb3i_conn_max_recv_dlength -- check the max. recv pdu segment size
- * @conn: iscsi connection
- * return 0 if the value is valid, < 0 otherwise.
- */
-static inline int cxgb3i_conn_max_recv_dlength(struct iscsi_conn *conn)
-{
-	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
-	struct cxgb3i_conn *cconn = tcp_conn->dd_data;
-	unsigned int max = cconn->hba->snic->rx_max_size;
-
-	align_pdu_size(max);
-	if (conn->max_recv_dlength) {
-		if (conn->max_recv_dlength > max) {
-			cxgb3i_log_error("MaxRecvDataSegmentLength %u too big."
-					 " Need to be <= %u.\n",
-					 conn->max_recv_dlength, max);
-			return -EINVAL;
-		}
-		conn->max_recv_dlength = min(conn->max_recv_dlength, max);
-		align_pdu_size(conn->max_recv_dlength);
-	} else
-		conn->max_recv_dlength = max;
-	cxgb3i_api_debug("conn 0x%p, max recv %u.\n",
-			 conn, conn->max_recv_dlength);
-	return 0;
-}
-
-/**
- * cxgb3i_conn_create - create iscsi connection instance
- * @cls_session:	pointer to iscsi cls session
- * @cid:		iscsi cid
- *
- * Creates a new iSCSI connection instance for a given session
- */
-static struct iscsi_cls_conn *cxgb3i_conn_create(struct iscsi_cls_session
-						 *cls_session, u32 cid)
-{
-	struct iscsi_cls_conn *cls_conn;
-	struct iscsi_conn *conn;
-	struct iscsi_tcp_conn *tcp_conn;
-	struct cxgb3i_conn *cconn;
-
-	cxgb3i_api_debug("sess 0x%p, cid %u.\n", cls_session, cid);
-
-	cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
-	if (!cls_conn)
-		return NULL;
-	conn = cls_conn->dd_data;
-	tcp_conn = conn->dd_data;
-	cconn = tcp_conn->dd_data;
-
-	cconn->conn = conn;
-	return cls_conn;
-}
-
-/**
- * cxgb3i_conn_bind - binds iscsi sess, conn and endpoint together
- * @cls_session:	pointer to iscsi cls session
- * @cls_conn:		pointer to iscsi cls conn
- * @transport_eph:	64-bit EP handle
- * @is_leading:		leading connection on this session?
- *
- * Binds together an iSCSI session, an iSCSI connection and a
- *	TCP connection. This routine returns error code if the TCP
- *	connection does not belong on the device iSCSI sess/conn is bound
- */
-
-static int cxgb3i_conn_bind(struct iscsi_cls_session *cls_session,
-			    struct iscsi_cls_conn *cls_conn,
-			    u64 transport_eph, int is_leading)
-{
-	struct iscsi_conn *conn = cls_conn->dd_data;
-	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
-	struct cxgb3i_conn *cconn = tcp_conn->dd_data;
-	struct cxgb3i_adapter *snic;
-	struct iscsi_endpoint *ep;
-	struct cxgb3i_endpoint *cep;
-	struct s3_conn *c3cn;
-	int err;
-
-	ep = iscsi_lookup_endpoint(transport_eph);
-	if (!ep)
-		return -EINVAL;
-
-	/* setup ddp pagesize */
-	cep = ep->dd_data;
-	c3cn = cep->c3cn;
-	snic = cep->hba->snic;
-	err = cxgb3i_setup_conn_host_pagesize(snic->tdev, c3cn->tid, 0);
-	if (err < 0)
-		return err;
-
-	cxgb3i_api_debug("ep 0x%p, cls sess 0x%p, cls conn 0x%p.\n",
-			 ep, cls_session, cls_conn);
-
-	err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
-	if (err)
-		return -EINVAL;
-
-	/* calculate the tag idx bits needed for this conn based on cmds_max */
-	cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
-	cxgb3i_api_debug("session cmds_max 0x%x, bits %u.\n",
-			 conn->session->cmds_max, cconn->task_idx_bits);
-
-	read_lock(&c3cn->callback_lock);
-	c3cn->user_data = conn;
-	cconn->hba = cep->hba;
-	cconn->cep = cep;
-	cep->cconn = cconn;
-	read_unlock(&c3cn->callback_lock);
-
-	cxgb3i_conn_max_xmit_dlength(conn);
-	cxgb3i_conn_max_recv_dlength(conn);
-
-	spin_lock_bh(&conn->session->lock);
-	sprintf(conn->portal_address, "%pI4", &c3cn->daddr.sin_addr.s_addr);
-	conn->portal_port = ntohs(c3cn->daddr.sin_port);
-	spin_unlock_bh(&conn->session->lock);
-
-	/* init recv engine */
-	iscsi_tcp_hdr_recv_prep(tcp_conn);
-
-	return 0;
-}
-
-/**
- * cxgb3i_conn_get_param - return iscsi connection parameter to caller
- * @cls_conn:	pointer to iscsi cls conn
- * @param:	parameter type identifier
- * @buf:	buffer pointer
- *
- * returns iSCSI connection parameters
- */
-static int cxgb3i_conn_get_param(struct iscsi_cls_conn *cls_conn,
-				 enum iscsi_param param, char *buf)
-{
-	struct iscsi_conn *conn = cls_conn->dd_data;
-	int len;
-
-	cxgb3i_api_debug("cls_conn 0x%p, param %d.\n", cls_conn, param);
-
-	switch (param) {
-	case ISCSI_PARAM_CONN_PORT:
-		spin_lock_bh(&conn->session->lock);
-		len = sprintf(buf, "%hu\n", conn->portal_port);
-		spin_unlock_bh(&conn->session->lock);
-		break;
-	case ISCSI_PARAM_CONN_ADDRESS:
-		spin_lock_bh(&conn->session->lock);
-		len = sprintf(buf, "%s\n", conn->portal_address);
-		spin_unlock_bh(&conn->session->lock);
-		break;
-	default:
-		return iscsi_conn_get_param(cls_conn, param, buf);
-	}
-
-	return len;
-}
-
-/**
- * cxgb3i_conn_set_param - set iscsi connection parameter
- * @cls_conn:	pointer to iscsi cls conn
- * @param:	parameter type identifier
- * @buf:	buffer pointer
- * @buflen:	buffer length
- *
- * set iSCSI connection parameters
- */
-static int cxgb3i_conn_set_param(struct iscsi_cls_conn *cls_conn,
-				 enum iscsi_param param, char *buf, int buflen)
-{
-	struct iscsi_conn *conn = cls_conn->dd_data;
-	struct iscsi_session *session = conn->session;
-	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
-	struct cxgb3i_conn *cconn = tcp_conn->dd_data;
-	struct cxgb3i_adapter *snic = cconn->hba->snic;
-	struct s3_conn *c3cn = cconn->cep->c3cn;
-	int value, err = 0;
-
-	switch (param) {
-	case ISCSI_PARAM_HDRDGST_EN:
-		err = iscsi_set_param(cls_conn, param, buf, buflen);
-		if (!err && conn->hdrdgst_en)
-			err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
-							conn->hdrdgst_en,
-							conn->datadgst_en, 0);
-		break;
-	case ISCSI_PARAM_DATADGST_EN:
-		err = iscsi_set_param(cls_conn, param, buf, buflen);
-		if (!err && conn->datadgst_en)
-			err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
-							conn->hdrdgst_en,
-							conn->datadgst_en, 0);
-		break;
-	case ISCSI_PARAM_MAX_R2T:
-		sscanf(buf, "%d", &value);
-		if (value <= 0 || !is_power_of_2(value))
-			return -EINVAL;
-		if (session->max_r2t == value)
-			break;
-		iscsi_tcp_r2tpool_free(session);
-		err = iscsi_set_param(cls_conn, param, buf, buflen);
-		if (!err && iscsi_tcp_r2tpool_alloc(session))
-			return -ENOMEM;
-	case ISCSI_PARAM_MAX_RECV_DLENGTH:
-		err = iscsi_set_param(cls_conn, param, buf, buflen);
-		if (!err)
-			err = cxgb3i_conn_max_recv_dlength(conn);
-		break;
-	case ISCSI_PARAM_MAX_XMIT_DLENGTH:
-		err = iscsi_set_param(cls_conn, param, buf, buflen);
-		if (!err)
-			err = cxgb3i_conn_max_xmit_dlength(conn);
-		break;
-	default:
-		return iscsi_set_param(cls_conn, param, buf, buflen);
-	}
-	return err;
-}
-
-/**
- * cxgb3i_host_set_param - configure host (adapter) related parameters
- * @shost:	scsi host pointer
- * @param:	parameter type identifier
- * @buf:	buffer pointer
- */
-static int cxgb3i_host_set_param(struct Scsi_Host *shost,
-				 enum iscsi_host_param param,
-				 char *buf, int buflen)
-{
-	struct cxgb3i_hba *hba = iscsi_host_priv(shost);
-
-	if (!hba->ndev) {
-		shost_printk(KERN_ERR, shost, "Could not set host param. "
-			     "Netdev for host not set.\n");
-		return -ENODEV;
-	}
-
-	cxgb3i_api_debug("param %d, buf %s.\n", param, buf);
-
-	switch (param) {
-	case ISCSI_HOST_PARAM_IPADDRESS:
-	{
-		__be32 addr = in_aton(buf);
-		cxgb3i_set_private_ipv4addr(hba->ndev, addr);
-		return 0;
-	}
-	case ISCSI_HOST_PARAM_HWADDRESS:
-	case ISCSI_HOST_PARAM_NETDEV_NAME:
-		/* ignore */
-		return 0;
-	default:
-		return iscsi_host_set_param(shost, param, buf, buflen);
-	}
-}
-
-/**
- * cxgb3i_host_get_param - returns host (adapter) related parameters
- * @shost:	scsi host pointer
- * @param:	parameter type identifier
- * @buf:	buffer pointer
- */
-static int cxgb3i_host_get_param(struct Scsi_Host *shost,
-				 enum iscsi_host_param param, char *buf)
-{
-	struct cxgb3i_hba *hba = iscsi_host_priv(shost);
-	int len = 0;
-
-	if (!hba->ndev) {
-		shost_printk(KERN_ERR, shost, "Could not set host param. "
-			     "Netdev for host not set.\n");
-		return -ENODEV;
-	}
-
-	cxgb3i_api_debug("hba %s, param %d.\n", hba->ndev->name, param);
-
-	switch (param) {
-	case ISCSI_HOST_PARAM_HWADDRESS:
-		len = sysfs_format_mac(buf, hba->ndev->dev_addr, 6);
-		break;
-	case ISCSI_HOST_PARAM_NETDEV_NAME:
-		len = sprintf(buf, "%s\n", hba->ndev->name);
-		break;
-	case ISCSI_HOST_PARAM_IPADDRESS:
-	{
-		__be32 addr;
-
-		addr = cxgb3i_get_private_ipv4addr(hba->ndev);
-		len = sprintf(buf, "%pI4", &addr);
-		break;
-	}
-	default:
-		return iscsi_host_get_param(shost, param, buf);
-	}
-	return len;
-}
-
-/**
- * cxgb3i_conn_get_stats - returns iSCSI stats
- * @cls_conn:	pointer to iscsi cls conn
- * @stats:	pointer to iscsi statistic struct
- */
-static void cxgb3i_conn_get_stats(struct iscsi_cls_conn *cls_conn,
-				  struct iscsi_stats *stats)
-{
-	struct iscsi_conn *conn = cls_conn->dd_data;
-
-	stats->txdata_octets = conn->txdata_octets;
-	stats->rxdata_octets = conn->rxdata_octets;
-	stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
-	stats->dataout_pdus = conn->dataout_pdus_cnt;
-	stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
-	stats->datain_pdus = conn->datain_pdus_cnt;
-	stats->r2t_pdus = conn->r2t_pdus_cnt;
-	stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
-	stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
-	stats->digest_err = 0;
-	stats->timeout_err = 0;
-	stats->custom_length = 1;
-	strcpy(stats->custom[0].desc, "eh_abort_cnt");
-	stats->custom[0].value = conn->eh_abort_cnt;
-}
-
-/**
- * cxgb3i_parse_itt - get the idx and age bits from a given tag
- * @conn:	iscsi connection
- * @itt:	itt tag
- * @idx:	task index, filled in by this function
- * @age:	session age, filled in by this function
- */
-static void cxgb3i_parse_itt(struct iscsi_conn *conn, itt_t itt,
-			     int *idx, int *age)
-{
-	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
-	struct cxgb3i_conn *cconn = tcp_conn->dd_data;
-	struct cxgb3i_adapter *snic = cconn->hba->snic;
-	u32 tag = ntohl((__force u32) itt);
-	u32 sw_bits;
-
-	sw_bits = cxgb3i_tag_nonrsvd_bits(&snic->tag_format, tag);
-	if (idx)
-		*idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
-	if (age)
-		*age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
-
-	cxgb3i_tag_debug("parse tag 0x%x/0x%x, sw 0x%x, itt 0x%x, age 0x%x.\n",
-			 tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
-			 age ? *age : 0xFF);
-}
-
-/**
- * cxgb3i_reserve_itt - generate tag for a give task
- * @task: iscsi task
- * @hdr_itt: tag, filled in by this function
- * Set up ddp for scsi read tasks if possible.
- */
-int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
-{
-	struct scsi_cmnd *sc = task->sc;
-	struct iscsi_conn *conn = task->conn;
-	struct iscsi_session *sess = conn->session;
-	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
-	struct cxgb3i_conn *cconn = tcp_conn->dd_data;
-	struct cxgb3i_adapter *snic = cconn->hba->snic;
-	struct cxgb3i_tag_format *tformat = &snic->tag_format;
-	u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
-	u32 tag;
-	int err = -EINVAL;
-
-	if (sc &&
-	    (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
-	    cxgb3i_sw_tag_usable(tformat, sw_tag)) {
-		struct s3_conn *c3cn = cconn->cep->c3cn;
-		struct cxgb3i_gather_list *gl;
-
-		gl = cxgb3i_ddp_make_gl(scsi_in(sc)->length,
-					scsi_in(sc)->table.sgl,
-					scsi_in(sc)->table.nents,
-					snic->pdev,
-					GFP_ATOMIC);
-		if (gl) {
-			tag = sw_tag;
-			err = cxgb3i_ddp_tag_reserve(snic->tdev, c3cn->tid,
-						     tformat, &tag,
-						     gl, GFP_ATOMIC);
-			if (err < 0)
-				cxgb3i_ddp_release_gl(gl, snic->pdev);
-		}
-	}
-
-	if (err < 0)
-		tag = cxgb3i_set_non_ddp_tag(tformat, sw_tag);
-	/* the itt need to sent in big-endian order */
-	*hdr_itt = (__force itt_t)htonl(tag);
-
-	cxgb3i_tag_debug("new tag 0x%x/0x%x (itt 0x%x, age 0x%x).\n",
-			 tag, *hdr_itt, task->itt, sess->age);
-	return 0;
-}
-
-/**
- * cxgb3i_release_itt - release the tag for a given task
- * @task:	iscsi task
- * @hdr_itt:	tag
- * If the tag is a ddp tag, release the ddp setup
- */
-void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt)
-{
-	struct scsi_cmnd *sc = task->sc;
-	struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
-	struct cxgb3i_conn *cconn = tcp_conn->dd_data;
-	struct cxgb3i_adapter *snic = cconn->hba->snic;
-	struct cxgb3i_tag_format *tformat = &snic->tag_format;
-	u32 tag = ntohl((__force u32)hdr_itt);
-
-	cxgb3i_tag_debug("release tag 0x%x.\n", tag);
-
-	if (sc &&
-	    (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
-	    cxgb3i_is_ddp_tag(tformat, tag))
-		cxgb3i_ddp_tag_release(snic->tdev, tag);
-}
-
-/**
- * cxgb3i_host_template -- Scsi_Host_Template structure
- *	used when registering with the scsi mid layer
- */
-static struct scsi_host_template cxgb3i_host_template = {
-	.module			= THIS_MODULE,
-	.name			= "Chelsio S3xx iSCSI Initiator",
-	.proc_name		= "cxgb3i",
-	.queuecommand		= iscsi_queuecommand,
-	.change_queue_depth	= iscsi_change_queue_depth,
-	.can_queue		= CXGB3I_SCSI_HOST_QDEPTH,
-	.sg_tablesize		= SG_ALL,
-	.max_sectors		= 0xFFFF,
-	.cmd_per_lun		= ISCSI_DEF_CMD_PER_LUN,
-	.eh_abort_handler	= iscsi_eh_abort,
-	.eh_device_reset_handler = iscsi_eh_device_reset,
-	.eh_target_reset_handler = iscsi_eh_recover_target,
-	.target_alloc		= iscsi_target_alloc,
-	.use_clustering		= DISABLE_CLUSTERING,
-	.this_id		= -1,
-};
-
-static struct iscsi_transport cxgb3i_iscsi_transport = {
-	.owner			= THIS_MODULE,
-	.name			= "cxgb3i",
-	.caps			= CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
-				| CAP_DATADGST | CAP_DIGEST_OFFLOAD |
-				CAP_PADDING_OFFLOAD,
-	.param_mask		= ISCSI_MAX_RECV_DLENGTH |
-				ISCSI_MAX_XMIT_DLENGTH |
-				ISCSI_HDRDGST_EN |
-				ISCSI_DATADGST_EN |
-				ISCSI_INITIAL_R2T_EN |
-				ISCSI_MAX_R2T |
-				ISCSI_IMM_DATA_EN |
-				ISCSI_FIRST_BURST |
-				ISCSI_MAX_BURST |
-				ISCSI_PDU_INORDER_EN |
-				ISCSI_DATASEQ_INORDER_EN |
-				ISCSI_ERL |
-				ISCSI_CONN_PORT |
-				ISCSI_CONN_ADDRESS |
-				ISCSI_EXP_STATSN |
-				ISCSI_PERSISTENT_PORT |
-				ISCSI_PERSISTENT_ADDRESS |
-				ISCSI_TARGET_NAME | ISCSI_TPGT |
-				ISCSI_USERNAME | ISCSI_PASSWORD |
-				ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
-				ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
-				ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
-				ISCSI_PING_TMO | ISCSI_RECV_TMO |
-				ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
-	.host_param_mask	= ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
-			ISCSI_HOST_INITIATOR_NAME | ISCSI_HOST_NETDEV_NAME,
-	.get_host_param		= cxgb3i_host_get_param,
-	.set_host_param		= cxgb3i_host_set_param,
-	/* session management */
-	.create_session		= cxgb3i_session_create,
-	.destroy_session	= cxgb3i_session_destroy,
-	.get_session_param	= iscsi_session_get_param,
-	/* connection management */
-	.create_conn		= cxgb3i_conn_create,
-	.bind_conn		= cxgb3i_conn_bind,
-	.destroy_conn		= iscsi_tcp_conn_teardown,
-	.start_conn		= iscsi_conn_start,
-	.stop_conn		= iscsi_conn_stop,
-	.get_conn_param		= cxgb3i_conn_get_param,
-	.set_param		= cxgb3i_conn_set_param,
-	.get_stats		= cxgb3i_conn_get_stats,
-	/* pdu xmit req. from user space */
-	.send_pdu		= iscsi_conn_send_pdu,
-	/* task */
-	.init_task		= iscsi_tcp_task_init,
-	.xmit_task		= iscsi_tcp_task_xmit,
-	.cleanup_task		= cxgb3i_conn_cleanup_task,
-
-	/* pdu */
-	.alloc_pdu		= cxgb3i_conn_alloc_pdu,
-	.init_pdu		= cxgb3i_conn_init_pdu,
-	.xmit_pdu		= cxgb3i_conn_xmit_pdu,
-	.parse_pdu_itt		= cxgb3i_parse_itt,
-
-	/* TCP connect/disconnect */
-	.ep_connect		= cxgb3i_ep_connect,
-	.ep_poll		= cxgb3i_ep_poll,
-	.ep_disconnect		= cxgb3i_ep_disconnect,
-	/* Error recovery timeout call */
-	.session_recovery_timedout = iscsi_session_recovery_timedout,
-};
-
-int cxgb3i_iscsi_init(void)
-{
-	sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
-	sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
-	cxgb3i_log_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
-			ISCSI_ITT_MASK, sw_tag_idx_bits,
-			ISCSI_AGE_MASK, sw_tag_age_bits);
-
-	cxgb3i_scsi_transport =
-	    iscsi_register_transport(&cxgb3i_iscsi_transport);
-	if (!cxgb3i_scsi_transport) {
-		cxgb3i_log_error("Could not register cxgb3i transport.\n");
-		return -ENODEV;
-	}
-	cxgb3i_api_debug("cxgb3i transport 0x%p.\n", cxgb3i_scsi_transport);
-	return 0;
-}
-
-void cxgb3i_iscsi_cleanup(void)
-{
-	if (cxgb3i_scsi_transport) {
-		cxgb3i_api_debug("cxgb3i transport 0x%p.\n",
-				 cxgb3i_scsi_transport);
-		iscsi_unregister_transport(&cxgb3i_iscsi_transport);
-	}
-}

drivers/scsi/cxgb3i/cxgb3i_offload.c

···
-/*
- * cxgb3i_offload.c: Chelsio S3xx iscsi offloaded tcp connection management
- *
- * Copyright (C) 2003-2008 Chelsio Communications.  All rights reserved.
- *
- * 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 LICENSE file included in this
- * release for licensing terms and conditions.
- *
- * Written by:	Dimitris Michailidis ([e-mail])
- *		Karen Xie ([e-mail])
- */
-
-#include <linux/if_vlan.h>
-#include <linux/slab.h>
-#include <linux/version.h>
-
-#include "cxgb3_defs.h"
-#include "cxgb3_ctl_defs.h"
-#include "firmware_exports.h"
-#include "cxgb3i_offload.h"
-#include "cxgb3i_pdu.h"
-#include "cxgb3i_ddp.h"
-
-#ifdef __DEBUG_C3CN_CONN__
-#define c3cn_conn_debug		cxgb3i_log_debug
-#else
-#define c3cn_conn_debug(fmt...)
-#endif
-
-#ifdef __DEBUG_C3CN_TX__
-#define c3cn_tx_debug		cxgb3i_log_debug
-#else
-#define c3cn_tx_debug(fmt...)
-#endif
-
-#ifdef __DEBUG_C3CN_RX__
-#define c3cn_rx_debug		cxgb3i_log_debug
-#else
-#define c3cn_rx_debug(fmt...)
-#endif
-
-/*
- * module parameters releated to offloaded iscsi connection
- */
-static int cxgb3_rcv_win = 256 * 1024;
-module_param(cxgb3_rcv_win, int, 0644);
-MODULE_PARM_DESC(cxgb3_rcv_win, "TCP receive window in bytes (default=256KB)");
-
-static int cxgb3_snd_win = 128 * 1024;
-module_param(cxgb3_snd_win, int, 0644);
-MODULE_PARM_DESC(cxgb3_snd_win, "TCP send window in bytes (default=128KB)");
-
-static int cxgb3_rx_credit_thres = 10 * 1024;
-module_param(cxgb3_rx_credit_thres, int, 0644);
-MODULE_PARM_DESC(rx_credit_thres,
-		 "RX credits return threshold in bytes (default=10KB)");
-
-static unsigned int cxgb3_max_connect = 8 * 1024;
-module_param(cxgb3_max_connect, uint, 0644);
-MODULE_PARM_DESC(cxgb3_max_connect, "Max. # of connections (default=8092)");
-
-static unsigned int cxgb3_sport_base = 20000;
-module_param(cxgb3_sport_base, uint, 0644);
-MODULE_PARM_DESC(cxgb3_sport_base, "starting port number (default=20000)");
-
-/*
- * cxgb3i tcp connection data(per adapter) list
- */
-static LIST_HEAD(cdata_list);
-static DEFINE_RWLOCK(cdata_rwlock);
-
-static int c3cn_push_tx_frames(struct s3_conn *c3cn, int req_completion);
-static void c3cn_release_offload_resources(struct s3_conn *c3cn);
-
-/*
- * iscsi source port management
- *
- * Find a free source port in the port allocation map. We use a very simple
- * rotor scheme to look for the next free port.
- *
- * If a source port has been specified make sure that it doesn't collide with
- * our normal source port allocation map.  If it's outside the range of our
- * allocation/deallocation scheme just let them use it.
- *
- * If the source port is outside our allocation range, the caller is
- * responsible for keeping track of their port usage.
- */
-static int c3cn_get_port(struct s3_conn *c3cn, struct cxgb3i_sdev_data *cdata)
-{
-	unsigned int start;
-	int idx;
-
-	if (!cdata)
-		goto error_out;
-
-	if (c3cn->saddr.sin_port) {
-		cxgb3i_log_error("connect, sin_port NON-ZERO %u.\n",
-				 c3cn->saddr.sin_port);
-		return -EADDRINUSE;
-	}
-
-	spin_lock_bh(&cdata->lock);
-	start = idx = cdata->sport_next;
-	do {
-		if (++idx >= cxgb3_max_connect)
-			idx = 0;
-		if (!cdata->sport_conn[idx]) {
-			c3cn->saddr.sin_port = htons(cxgb3_sport_base + idx);
-			cdata->sport_next = idx;
-			cdata->sport_conn[idx] = c3cn;
-			spin_unlock_bh(&cdata->lock);
-
-			c3cn_conn_debug("%s reserve port %u.\n",
-					cdata->cdev->name,
-					cxgb3_sport_base + idx);
-			return 0;
-		}
-	} while (idx != start);
-	spin_unlock_bh(&cdata->lock);
-
-error_out:
-	return -EADDRNOTAVAIL;
-}
-
-static void c3cn_put_port(struct s3_conn *c3cn)
-{
-	if (!c3cn->cdev)
-		return;
-
-	if (c3cn->saddr.sin_port) {
-		struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(c3cn->cdev);
-		int idx = ntohs(c3cn->saddr.sin_port) - cxgb3_sport_base;
-
-		c3cn->saddr.sin_port = 0;
-		if (idx < 0 || idx >= cxgb3_max_connect)
-			return;
-		spin_lock_bh(&cdata->lock);
-		cdata->sport_conn[idx] = NULL;
-		spin_unlock_bh(&cdata->lock);
-		c3cn_conn_debug("%s, release port %u.\n",
-				cdata->cdev->name, cxgb3_sport_base + idx);
-	}
-}
-
-static inline void c3cn_set_flag(struct s3_conn *c3cn, enum c3cn_flags flag)
-{
-	__set_bit(flag, &c3cn->flags);
-	c3cn_conn_debug("c3cn 0x%p, set %d, s %u, f 0x%lx.\n",
-			c3cn, flag, c3cn->state, c3cn->flags);
-}
-
-static inline void c3cn_clear_flag(struct s3_conn *c3cn, enum c3cn_flags flag)
-{
-	__clear_bit(flag, &c3cn->flags);
-	c3cn_conn_debug("c3cn 0x%p, clear %d, s %u, f 0x%lx.\n",
-			c3cn, flag, c3cn->state, c3cn->flags);
-}
-
-static inline int c3cn_flag(struct s3_conn *c3cn, enum c3cn_flags flag)
-{
-	if (c3cn == NULL)
-		return 0;
-	return test_bit(flag, &c3cn->flags);
-}
-
-static void c3cn_set_state(struct s3_conn *c3cn, int state)
-{
-	c3cn_conn_debug("c3cn 0x%p state -> %u.\n", c3cn, state);
-	c3cn->state = state;
-}
-
-static inline void c3cn_hold(struct s3_conn *c3cn)
-{
-	atomic_inc(&c3cn->refcnt);
-}
-
-static inline void c3cn_put(struct s3_conn *c3cn)
-{
-	if (atomic_dec_and_test(&c3cn->refcnt)) {
-		c3cn_conn_debug("free c3cn 0x%p, s %u, f 0x%lx.\n",
-				c3cn, c3cn->state, c3cn->flags);
-		kfree(c3cn);
-	}
-}
-
-static void c3cn_closed(struct s3_conn *c3cn)
-{
-	c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
-			 c3cn, c3cn->state, c3cn->flags);
-
-	c3cn_put_port(c3cn);
-	c3cn_release_offload_resources(c3cn);
-	c3cn_set_state(c3cn, C3CN_STATE_CLOSED);
-	cxgb3i_conn_closing(c3cn);
-}
-
-/*
- * CPL (Chelsio Protocol Language) defines a message passing interface between
- * the host driver and T3 asic.
- * The section below implments CPLs that related to iscsi tcp connection
- * open/close/abort and data send/receive.
- */
-
-/*
- * CPL connection active open request: host ->
- */
-static unsigned int find_best_mtu(const struct t3c_data *d, unsigned short mtu)
-{
-	int i = 0;
-
-	while (i < d->nmtus - 1 && d->mtus[i + 1] <= mtu)
-		++i;
-	return i;
-}
-
-static unsigned int select_mss(struct s3_conn *c3cn, unsigned int pmtu)
-{
-	unsigned int idx;
-	struct dst_entry *dst = c3cn->dst_cache;
-	struct t3cdev *cdev = c3cn->cdev;
-	const struct t3c_data *td = T3C_DATA(cdev);
-	u16 advmss = dst_metric(dst, RTAX_ADVMSS);
-
-	if (advmss > pmtu - 40)
-		advmss = pmtu - 40;
-	if (advmss < td->mtus[0] - 40)
-		advmss = td->mtus[0] - 40;
-	idx = find_best_mtu(td, advmss + 40);
-	return idx;
-}
-
-static inline int compute_wscale(int win)
-{
-	int wscale = 0;
-	while (wscale < 14 && (65535<<wscale) < win)
-		wscale++;
-	return wscale;
-}
-
-static inline unsigned int calc_opt0h(struct s3_conn *c3cn)
-{
-	int wscale = compute_wscale(cxgb3_rcv_win);
-	return  V_KEEP_ALIVE(1) |
-		F_TCAM_BYPASS |
-		V_WND_SCALE(wscale) |
-		V_MSS_IDX(c3cn->mss_idx);
-}
-
-static inline unsigned int calc_opt0l(struct s3_conn *c3cn)
-{
-	return  V_ULP_MODE(ULP_MODE_ISCSI) |
-		V_RCV_BUFSIZ(cxgb3_rcv_win>>10);
-}
-
-static void make_act_open_req(struct s3_conn *c3cn, struct sk_buff *skb,
-			      unsigned int atid, const struct l2t_entry *e)
-{
-	struct cpl_act_open_req *req;
-
-	c3cn_conn_debug("c3cn 0x%p, atid 0x%x.\n", c3cn, atid);
-
-	skb->priority = CPL_PRIORITY_SETUP;
-	req = (struct cpl_act_open_req *)__skb_put(skb, sizeof(*req));
-	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
-	req->wr.wr_lo = 0;
-	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ACT_OPEN_REQ, atid));
-	req->local_port = c3cn->saddr.sin_port;
-	req->peer_port = c3cn->daddr.sin_port;
-	req->local_ip = c3cn->saddr.sin_addr.s_addr;
-	req->peer_ip = c3cn->daddr.sin_addr.s_addr;
-	req->opt0h = htonl(calc_opt0h(c3cn) | V_L2T_IDX(e->idx) |
-			   V_TX_CHANNEL(e->smt_idx));
-	req->opt0l = htonl(calc_opt0l(c3cn));
-	req->params = 0;
-	req->opt2 = 0;
-}
-
-static void fail_act_open(struct s3_conn *c3cn, int errno)
-{
-	c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
-			c3cn, c3cn->state, c3cn->flags);
-	c3cn->err = errno;
-	c3cn_closed(c3cn);
-}
-
-static void act_open_req_arp_failure(struct t3cdev *dev, struct sk_buff *skb)
-{
-	struct s3_conn *c3cn = (struct s3_conn *)skb->sk;
-
-	c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state);
-
-	c3cn_hold(c3cn);
-	spin_lock_bh(&c3cn->lock);
-	if (c3cn->state == C3CN_STATE_CONNECTING)
-		fail_act_open(c3cn, -EHOSTUNREACH);
-	spin_unlock_bh(&c3cn->lock);
-	c3cn_put(c3cn);
-	__kfree_skb(skb);
-}
-
-/*
- * CPL connection close request: host ->
- *
- * Close a connection by sending a CPL_CLOSE_CON_REQ message and queue it to
- * the write queue (i.e., after any unsent txt data).
- */
-static void skb_entail(struct s3_conn *c3cn, struct sk_buff *skb,
-		       int flags)
-{
-	skb_tcp_seq(skb) = c3cn->write_seq;
-	skb_flags(skb) = flags;
-	__skb_queue_tail(&c3cn->write_queue, skb);
-}
-
-static void send_close_req(struct s3_conn *c3cn)
-{
-	struct sk_buff *skb = c3cn->cpl_close;
-	struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
-	unsigned int tid = c3cn->tid;
-
-	c3cn_conn_debug("c3cn 0x%p, state 0x%x, flag 0x%lx.\n",
-			c3cn, c3cn->state, c3cn->flags);
-
-	c3cn->cpl_close = NULL;
-
-	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_CLOSE_CON));
-	req->wr.wr_lo = htonl(V_WR_TID(tid));
-	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
-	req->rsvd = htonl(c3cn->write_seq);
-
-	skb_entail(c3cn, skb, C3CB_FLAG_NO_APPEND);
-	if (c3cn->state != C3CN_STATE_CONNECTING)
-		c3cn_push_tx_frames(c3cn, 1);
-}
-
-/*
- * CPL connection abort request: host ->
- *
- * Send an ABORT_REQ message. Makes sure we do not send multiple ABORT_REQs
- * for the same connection and also that we do not try to send a message
- * after the connection has closed.
- */
-static void abort_arp_failure(struct t3cdev *cdev, struct sk_buff *skb)
-{
-	struct cpl_abort_req *req = cplhdr(skb);
-
-	c3cn_conn_debug("tdev 0x%p.\n", cdev);
-
-	req->cmd = CPL_ABORT_NO_RST;
-	cxgb3_ofld_send(cdev, skb);
-}
-
-static inline void c3cn_purge_write_queue(struct s3_conn *c3cn)
-{
-	struct sk_buff *skb;
-
-	while ((skb = __skb_dequeue(&c3cn->write_queue)))
-		__kfree_skb(skb);
-}
-
-static void send_abort_req(struct s3_conn *c3cn)
-{
-	struct sk_buff *skb = c3cn->cpl_abort_req;
-	struct cpl_abort_req *req;
-	unsigned int tid = c3cn->tid;
-
-	if (unlikely(c3cn->state == C3CN_STATE_ABORTING) || !skb ||
-		     !c3cn->cdev)
-		return;
-
-	c3cn_set_state(c3cn, C3CN_STATE_ABORTING);
-
-	c3cn_conn_debug("c3cn 0x%p, flag ABORT_RPL + ABORT_SHUT.\n", c3cn);
-
-	c3cn_set_flag(c3cn, C3CN_ABORT_RPL_PENDING);
-
-	/* Purge the send queue so we don't send anything after an abort. */
-	c3cn_purge_write_queue(c3cn);
-
-	c3cn->cpl_abort_req = NULL;
-	req = (struct cpl_abort_req *)skb->head;
-	memset(req, 0, sizeof(*req));
-
-	skb->priority = CPL_PRIORITY_DATA;
-	set_arp_failure_handler(skb, abort_arp_failure);
-
-	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_REQ));
-	req->wr.wr_lo = htonl(V_WR_TID(tid));
-	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ABORT_REQ, tid));
-	req->rsvd0 = htonl(c3cn->snd_nxt);
-	req->rsvd1 = !c3cn_flag(c3cn, C3CN_TX_DATA_SENT);
-	req->cmd = CPL_ABORT_SEND_RST;
-
-	l2t_send(c3cn->cdev, skb, c3cn->l2t);
-}
-
-/*
- * CPL connection abort reply: host ->
- *
- * Send an ABORT_RPL message in response of the ABORT_REQ received.
- */
-static void send_abort_rpl(struct s3_conn *c3cn, int rst_status)
-{
-	struct sk_buff *skb = c3cn->cpl_abort_rpl;
-	struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
-
-	c3cn->cpl_abort_rpl = NULL;
-
-	skb->priority = CPL_PRIORITY_DATA;
-	memset(rpl, 0, sizeof(*rpl));
-	rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
-	rpl->wr.wr_lo = htonl(V_WR_TID(c3cn->tid));
-	OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, c3cn->tid));
-	rpl->cmd = rst_status;
-
-	cxgb3_ofld_send(c3cn->cdev, skb);
-}
-
-/*
- * CPL connection rx data ack: host ->
- * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
- * credits sent.
- */
-static u32 send_rx_credits(struct s3_conn *c3cn, u32 credits, u32 dack)
-{
-	struct sk_buff *skb;
-	struct cpl_rx_data_ack *req;
-
-	skb = alloc_skb(sizeof(*req), GFP_ATOMIC);
-	if (!skb)
-		return 0;
-
-	req = (struct cpl_rx_data_ack *)__skb_put(skb, sizeof(*req));
-	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
-	req->wr.wr_lo = 0;
-	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_RX_DATA_ACK, c3cn->tid));
-	req->credit_dack = htonl(dack | V_RX_CREDITS(credits));
-	skb->priority = CPL_PRIORITY_ACK;
-	cxgb3_ofld_send(c3cn->cdev, skb);
-	return credits;
-}
-
-/*
- * CPL connection tx data: host ->
- *
- * Send iscsi PDU via TX_DATA CPL message. Returns the number of
- * credits sent.
- * Each TX_DATA consumes work request credit (wrs), so we need to keep track of
- * how many we've used so far and how many are pending (i.e., yet ack'ed by T3).
- */
-
-/*
- * For ULP connections HW may inserts digest bytes into the pdu. Those digest
- * bytes are not sent by the host but are part of the TCP payload and therefore
- * consume TCP sequence space.
- */
-static const unsigned int cxgb3_ulp_extra_len[] = { 0, 4, 4, 8 };
-static inline unsigned int ulp_extra_len(const struct sk_buff *skb)
-{
-	return cxgb3_ulp_extra_len[skb_ulp_mode(skb) & 3];
-}
-
-static unsigned int wrlen __read_mostly;
-
-/*
- * The number of WRs needed for an skb depends on the number of fragments
- * in the skb and whether it has any payload in its main body.  This maps the
- * length of the gather list represented by an skb into the # of necessary WRs.
- * The extra two fragments are for iscsi bhs and payload padding.
- */
-#define SKB_WR_LIST_SIZE	(MAX_SKB_FRAGS + 2)
-static unsigned int skb_wrs[SKB_WR_LIST_SIZE] __read_mostly;
-
-static void s3_init_wr_tab(unsigned int wr_len)
-{
-	int i;
-
-	if (skb_wrs[1])		/* already initialized */
-		return;
-
-	for (i = 1; i < SKB_WR_LIST_SIZE; i++) {
-		int sgl_len = (3 * i) / 2 + (i & 1);
-
-		sgl_len += 3;
-		skb_wrs[i] = (sgl_len <= wr_len
-			      ? 1 : 1 + (sgl_len - 2) / (wr_len - 1));
-	}
-
-	wrlen = wr_len * 8;
-}
-
-static inline void reset_wr_list(struct s3_conn *c3cn)
-{
-	c3cn->wr_pending_head = c3cn->wr_pending_tail = NULL;
-}
-
-/*
- * Add a WR to a connections's list of pending WRs.  This is a singly-linked
- * list of sk_buffs operating as a FIFO.  The head is kept in wr_pending_head
- * and the tail in wr_pending_tail.
- */
-static inline void enqueue_wr(struct s3_conn *c3cn,
-			      struct sk_buff *skb)
-{
-	skb_tx_wr_next(skb) = NULL;
-
-	/*
-	 * We want to take an extra reference since both us and the driver
-	 * need to free the packet before it's really freed. We know there's
-	 * just one user currently so we use atomic_set rather than skb_get
-	 * to avoid the atomic op.
-	 */
-	atomic_set(&skb->users, 2);
-
-	if (!c3cn->wr_pending_head)
-		c3cn->wr_pending_head = skb;
-	else
-		skb_tx_wr_next(c3cn->wr_pending_tail) = skb;
-	c3cn->wr_pending_tail = skb;
-}
-
-static int count_pending_wrs(struct s3_conn *c3cn)
-{
-	int n = 0;
-	const struct sk_buff *skb = c3cn->wr_pending_head;
-
-	while (skb) {
-		n += skb->csum;
-		skb = skb_tx_wr_next(skb);
-	}
-	return n;
-}
-
-static inline struct sk_buff *peek_wr(const struct s3_conn *c3cn)
-{
-	return c3cn->wr_pending_head;
-}
-
-static inline void free_wr_skb(struct sk_buff *skb)
-{
-	kfree_skb(skb);
-}
-
-static inline struct sk_buff *dequeue_wr(struct s3_conn *c3cn)
-{
-	struct sk_buff *skb = c3cn->wr_pending_head;
-
-	if (likely(skb)) {
-		/* Don't bother clearing the tail */
-		c3cn->wr_pending_head = skb_tx_wr_next(skb);
-		skb_tx_wr_next(skb) = NULL;
-	}
-	return skb;
-}
-
-static void purge_wr_queue(struct s3_conn *c3cn)
-{
-	struct sk_buff *skb;
-	while ((skb = dequeue_wr(c3cn)) != NULL)
-		free_wr_skb(skb);
-}
-
-static inline void make_tx_data_wr(struct s3_conn *c3cn, struct sk_buff *skb,
-				   int len, int req_completion)
-{
-	struct tx_data_wr *req;
-
-	skb_reset_transport_header(skb);
-	req = (struct tx_data_wr *)__skb_push(skb, sizeof(*req));
-	req->wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA) |
-			(req_completion ? F_WR_COMPL : 0));
-	req->wr_lo = htonl(V_WR_TID(c3cn->tid));
-	req->sndseq = htonl(c3cn->snd_nxt);
-	/* len includes the length of any HW ULP additions */
-	req->len = htonl(len);
-	req->param = htonl(V_TX_PORT(c3cn->l2t->smt_idx));
-	/* V_TX_ULP_SUBMODE sets both the mode and submode */
-	req->flags = htonl(V_TX_ULP_SUBMODE(skb_ulp_mode(skb)) |
-			   V_TX_SHOVE((skb_peek(&c3cn->write_queue) ? 0 : 1)));
-
-	if (!c3cn_flag(c3cn, C3CN_TX_DATA_SENT)) {
-		req->flags |= htonl(V_TX_ACK_PAGES(2) | F_TX_INIT |
-				    V_TX_CPU_IDX(c3cn->qset));
-		/* Sendbuffer is in units of 32KB. */
-		req->param |= htonl(V_TX_SNDBUF(cxgb3_snd_win >> 15));
-		c3cn_set_flag(c3cn, C3CN_TX_DATA_SENT);
-	}
-}
-
-/**
- * c3cn_push_tx_frames -- start transmit
- * @c3cn: the offloaded connection
- * @req_completion: request wr_ack or not
- *
- * Prepends TX_DATA_WR or CPL_CLOSE_CON_REQ headers to buffers waiting in a
- * connection's send queue and sends them on to T3.  Must be called with the
- * connection's lock held.  Returns the amount of send buffer space that was
- * freed as a result of sending queued data to T3.
- */
-static void arp_failure_discard(struct t3cdev *cdev, struct sk_buff *skb)
-{
-	kfree_skb(skb);
-}
-
-static int c3cn_push_tx_frames(struct s3_conn *c3cn, int req_completion)
-{
-	int total_size = 0;
-	struct sk_buff *skb;
-	struct t3cdev *cdev;
-	struct cxgb3i_sdev_data *cdata;
-
-	if (unlikely(c3cn->state == C3CN_STATE_CONNECTING ||
-		     c3cn->state == C3CN_STATE_CLOSE_WAIT_1 ||
-		     c3cn->state >= C3CN_STATE_ABORTING)) {
-		c3cn_tx_debug("c3cn 0x%p, in closing state %u.\n",
-			      c3cn, c3cn->state);
-		return 0;
-	}
-
-	cdev = c3cn->cdev;
-	cdata = CXGB3_SDEV_DATA(cdev);
-
-	while (c3cn->wr_avail
-	       && (skb = skb_peek(&c3cn->write_queue)) != NULL) {
-		int len = skb->len;	/* length before skb_push */
-		int frags = skb_shinfo(skb)->nr_frags + (len != skb->data_len);
-		int wrs_needed = skb_wrs[frags];
-
-		if (wrs_needed > 1 && len + sizeof(struct tx_data_wr) <= wrlen)
-			wrs_needed = 1;
-
-		WARN_ON(frags >= SKB_WR_LIST_SIZE || wrs_needed < 1);
-
-		if (c3cn->wr_avail < wrs_needed) {
-			c3cn_tx_debug("c3cn 0x%p, skb len %u/%u, frag %u, "
-				      "wr %d < %u.\n",
-				      c3cn, skb->len, skb->data_len, frags,
-				      wrs_needed, c3cn->wr_avail);
-			break;
-		}
-
-		__skb_unlink(skb, &c3cn->write_queue);
-		skb->priority = CPL_PRIORITY_DATA;
-		skb->csum = wrs_needed;	/* remember this until the WR_ACK */
-		c3cn->wr_avail -= wrs_needed;
-		c3cn->wr_unacked += wrs_needed;
-		enqueue_wr(c3cn, skb);
-
-		c3cn_tx_debug("c3cn 0x%p, enqueue, skb len %u/%u, frag %u, "
-				"wr %d, left %u, unack %u.\n",
-				c3cn, skb->len, skb->data_len, frags,
-				wrs_needed, c3cn->wr_avail, c3cn->wr_unacked);
-
-
-		if (likely(skb_flags(skb) & C3CB_FLAG_NEED_HDR)) {
-			if ((req_completion &&
-				c3cn->wr_unacked == wrs_needed) ||
-			    (skb_flags(skb) & C3CB_FLAG_COMPL) ||
-			    c3cn->wr_unacked >= c3cn->wr_max / 2) {
-				req_completion = 1;
-				c3cn->wr_unacked = 0;
-			}
-			len += ulp_extra_len(skb);
-			make_tx_data_wr(c3cn, skb, len, req_completion);
-			c3cn->snd_nxt += len;
-			skb_flags(skb) &= ~C3CB_FLAG_NEED_HDR;
-		}
-
-		total_size += skb->truesize;
-		set_arp_failure_handler(skb, arp_failure_discard);
-		l2t_send(cdev, skb, c3cn->l2t);
-	}
-	return total_size;
-}
-
-/*
- * process_cpl_msg: -> host
- * Top-level CPL message processing used by most CPL messages that
- * pertain to connections.
- */
-static inline void process_cpl_msg(void (*fn)(struct s3_conn *,
-					      struct sk_buff *),
-				   struct s3_conn *c3cn,
-				   struct sk_buff *skb)
-{
-	spin_lock_bh(&c3cn->lock);
-	fn(c3cn, skb);
-	spin_unlock_bh(&c3cn->lock);
-}
-
-/*
- * process_cpl_msg_ref: -> host
- * Similar to process_cpl_msg() but takes an extra connection reference around
- * the call to the handler.  Should be used if the handler may drop a
- * connection reference.
- */
-static inline void process_cpl_msg_ref(void (*fn) (struct s3_conn *,
-						   struct sk_buff *),
-				       struct s3_conn *c3cn,
-				       struct sk_buff *skb)
-{
-	c3cn_hold(c3cn);
-	process_cpl_msg(fn, c3cn, skb);
-	c3cn_put(c3cn);
-}
-
-/*
- * Process a CPL_ACT_ESTABLISH message: -> host
- * Updates connection state from an active establish CPL message.  Runs with
- * the connection lock held.
- */
-
-static inline void s3_free_atid(struct t3cdev *cdev, unsigned int tid)
-{
-	struct s3_conn *c3cn = cxgb3_free_atid(cdev, tid);
-	if (c3cn)
-		c3cn_put(c3cn);
-}
-
-static void c3cn_established(struct s3_conn *c3cn, u32 snd_isn,
-			     unsigned int opt)
-{
-	c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state);
-
-	c3cn->write_seq = c3cn->snd_nxt = c3cn->snd_una = snd_isn;
-
-	/*
-	 * Causes the first RX_DATA_ACK to supply any Rx credits we couldn't
-	 * pass through opt0.
-	 */
-	if (cxgb3_rcv_win > (M_RCV_BUFSIZ << 10))
-		c3cn->rcv_wup -= cxgb3_rcv_win - (M_RCV_BUFSIZ << 10);
-
-	dst_confirm(c3cn->dst_cache);
-
-	smp_mb();
-
-	c3cn_set_state(c3cn, C3CN_STATE_ESTABLISHED);
-}
-
-static void process_act_establish(struct s3_conn *c3cn, struct sk_buff *skb)
-{
-	struct cpl_act_establish *req = cplhdr(skb);
-	u32 rcv_isn = ntohl(req->rcv_isn);	/* real RCV_ISN + 1 */
-
-	c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
-			c3cn, c3cn->state, c3cn->flags);
-
-	if (unlikely(c3cn->state != C3CN_STATE_CONNECTING))
-		cxgb3i_log_error("TID %u expected SYN_SENT, got EST., s %u\n",
-				 c3cn->tid, c3cn->state);
-
-	c3cn->copied_seq = c3cn->rcv_wup = c3cn->rcv_nxt = rcv_isn;
-	c3cn_established(c3cn, ntohl(req->snd_isn), ntohs(req->tcp_opt));
-
-	__kfree_skb(skb);
-
-	if (unlikely(c3cn_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED)))
-		/* upper layer has requested closing */
-		send_abort_req(c3cn);
-	else {
-		if (skb_queue_len(&c3cn->write_queue))
-			c3cn_push_tx_frames(c3cn, 1);
-		cxgb3i_conn_tx_open(c3cn);
-	}
-}
-
-static int do_act_establish(struct t3cdev *cdev, struct sk_buff *skb,
-			    void *ctx)
-{
-	struct cpl_act_establish *req = cplhdr(skb);
-	unsigned int tid = GET_TID(req);
-	unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
-	struct s3_conn *c3cn = ctx;
-	struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(cdev);
-
-	c3cn_conn_debug("rcv, tid 0x%x, c3cn 0x%p, s %u, f 0x%lx.\n",
-			tid, c3cn, c3cn->state, c3cn->flags);
-
-	c3cn->tid = tid;
-	c3cn_hold(c3cn);
-	cxgb3_insert_tid(cdata->cdev, cdata->client, c3cn, tid);
-	s3_free_atid(cdev, atid);
-
-	c3cn->qset = G_QNUM(ntohl(skb->csum));
-
-	process_cpl_msg(process_act_establish, c3cn, skb);
-	return 0;
-}
-
-/*
- * Process a CPL_ACT_OPEN_RPL message: -> host
- * Handle active open failures.
- */
-static int act_open_rpl_status_to_errno(int status)
-{
-	switch (status) {
-	case CPL_ERR_CONN_RESET:
-		return -ECONNREFUSED;
-	case CPL_ERR_ARP_MISS:
-		return -EHOSTUNREACH;
-	case CPL_ERR_CONN_TIMEDOUT:
-		return -ETIMEDOUT;
-	case CPL_ERR_TCAM_FULL:
-		return -ENOMEM;
-	case CPL_ERR_CONN_EXIST:
-		cxgb3i_log_error("ACTIVE_OPEN_RPL: 4-tuple in use\n");
-		return -EADDRINUSE;
-	default:
-		return -EIO;
-	}
-}
-
-static void act_open_retry_timer(unsigned long data)
-{
-	struct sk_buff *skb;
-	struct s3_conn *c3cn = (struct s3_conn *)data;
-
-	c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state);
-
-	spin_lock_bh(&c3cn->lock);
-	skb = alloc_skb(sizeof(struct cpl_act_open_req), GFP_ATOMIC);
-	if (!skb)
-		fail_act_open(c3cn, -ENOMEM);
-	else {
-		skb->sk = (struct sock *)c3cn;
-		set_arp_failure_handler(skb, act_open_req_arp_failure);
-		make_act_open_req(c3cn, skb, c3cn->tid, c3cn->l2t);
-		l2t_send(c3cn->cdev, skb, c3cn->l2t);
-	}
-	spin_unlock_bh(&c3cn->lock);
-	c3cn_put(c3cn);
-}
-
-static void process_act_open_rpl(struct s3_conn *c3cn, struct sk_buff *skb)
-{
-	struct cpl_act_open_rpl *rpl = cplhdr(skb);
-
-	c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
-			c3cn, c3cn->state, c3cn->flags);
-
-	if (rpl->status == CPL_ERR_CONN_EXIST &&
-	    c3cn->retry_timer.function != act_open_retry_timer) {
-		c3cn->retry_timer.function = act_open_retry_timer;
-		if (!mod_timer(&c3cn->retry_timer, jiffies + HZ / 2))
-			c3cn_hold(c3cn);
-	} else
-		fail_act_open(c3cn, act_open_rpl_status_to_errno(rpl->status));
-	__kfree_skb(skb);
-}
-
-static int do_act_open_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
-{
-	struct s3_conn *c3cn = ctx;
-	struct cpl_act_open_rpl *rpl = cplhdr(skb);
-
-	c3cn_conn_debug("rcv, status 0x%x, c3cn 0x%p, s %u, f 0x%lx.\n",
-			rpl->status, c3cn, c3cn->state, c3cn->flags);
-
-	if (rpl->status != CPL_ERR_TCAM_FULL &&
-	    rpl->status != CPL_ERR_CONN_EXIST &&
-	    rpl->status != CPL_ERR_ARP_MISS)
-		cxgb3_queue_tid_release(cdev, GET_TID(rpl));
-
-	process_cpl_msg_ref(process_act_open_rpl, c3cn, skb);
-	return 0;
-}
-
-/*
- * Process PEER_CLOSE CPL messages: -> host
- * Handle peer FIN.
- */
-static void process_peer_close(struct s3_conn *c3cn, struct sk_buff *skb)
-{
-	c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
-			c3cn, c3cn->state, c3cn->flags);
-
-	if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING))
-		goto out;
-
-	switch (c3cn->state) {
-	case C3CN_STATE_ESTABLISHED:
-		c3cn_set_state(c3cn, C3CN_STATE_PASSIVE_CLOSE);
-		break;
-	case C3CN_STATE_ACTIVE_CLOSE:
-		c3cn_set_state(c3cn, C3CN_STATE_CLOSE_WAIT_2);
-		break;
-	case C3CN_STATE_CLOSE_WAIT_1:
-		c3cn_closed(c3cn);
-		break;
-	case C3CN_STATE_ABORTING:
-		break;
-	default:
-		cxgb3i_log_error("%s: peer close, TID %u in bad state %u\n",
-				 c3cn->cdev->name, c3cn->tid, c3cn->state);
-	}
-
-	cxgb3i_conn_closing(c3cn);
-out:
-	__kfree_skb(skb);
-}
-
-static int do_peer_close(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
-{
-	struct s3_conn *c3cn = ctx;
-
-	c3cn_conn_debug("rcv, c3cn 0x%p, s %u, f 0x%lx.\n",
-			c3cn, c3cn->state, c3cn->flags);
-	process_cpl_msg_ref(process_peer_close, c3cn, skb);
-	return 0;
-}
-
-/*
- * Process CLOSE_CONN_RPL CPL message: -> host
- * Process a peer ACK to our FIN.
- */
-static void process_close_con_rpl(struct s3_conn *c3cn, struct sk_buff *skb)
-{
-	struct cpl_close_con_rpl *rpl = cplhdr(skb);
-
-	c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
-			c3cn, c3cn->state, c3cn->flags);
-
-	c3cn->snd_una = ntohl(rpl->snd_nxt) - 1;	/* exclude FIN */
-
-	if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING))
-		goto out;
-
-	switch (c3cn->state) {
-	case C3CN_STATE_ACTIVE_CLOSE:
-		c3cn_set_state(c3cn, C3CN_STATE_CLOSE_WAIT_1);
-		break;
-	case C3CN_STATE_CLOSE_WAIT_1:
-	case C3CN_STATE_CLOSE_WAIT_2:
-		c3cn_closed(c3cn);
-		break;
-	case C3CN_STATE_ABORTING:
-		break;
-	default:
-		cxgb3i_log_error("%s: close_rpl, TID %u in bad state %u\n",
-				 c3cn->cdev->name, c3cn->tid, c3cn->state);
-	}
-
-out:
-	kfree_skb(skb);
-}
-
-static int do_close_con_rpl(struct t3cdev *cdev, struct sk_buff *skb,
-			    void *ctx)
-{
-	struct s3_conn *c3cn = ctx;
-
-	c3cn_conn_debug("rcv, c3cn 0x%p, s %u, f 0x%lx.\n",
-			 c3cn, c3cn->state, c3cn->flags);
-
-	process_cpl_msg_ref(process_close_con_rpl, c3cn, skb);
-	return 0;
-}
-
-/*
- * Process ABORT_REQ_RSS CPL message: -> host
- * Process abort requests.  If we are waiting for an ABORT_RPL we ignore this
- * request except that we need to reply to it.
- */
-
-static int abort_status_to_errno(struct s3_conn *c3cn, int abort_reason,
-				 int *need_rst)
-{
-	switch (abort_reason) {
-	case CPL_ERR_BAD_SYN: /* fall through */
-	case CPL_ERR_CONN_RESET:
-		return c3cn->state > C3CN_STATE_ESTABLISHED ?
-			-EPIPE : -ECONNRESET;
-	case CPL_ERR_XMIT_TIMEDOUT:
-	case CPL_ERR_PERSIST_TIMEDOUT:
-	case CPL_ERR_FINWAIT2_TIMEDOUT:
-	case CPL_ERR_KEEPALIVE_TIMEDOUT:
-		return -ETIMEDOUT;
-	default:
-		return -EIO;
-	}
-}
-
-static void process_abort_req(struct s3_conn *c3cn, struct sk_buff *skb)
-{
-	int rst_status = CPL_ABORT_NO_RST;
-	const struct cpl_abort_req_rss *req = cplhdr(skb);
-
-	c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
-			c3cn, c3cn->state, c3cn->flags);
-
-	if (!c3cn_flag(c3cn, C3CN_ABORT_REQ_RCVD)) {
-		c3cn_set_flag(c3cn, C3CN_ABORT_REQ_RCVD);
-		c3cn_set_state(c3cn, C3CN_STATE_ABORTING);
-		__kfree_skb(skb);
-		return;
-	}
-
-	c3cn_clear_flag(c3cn, C3CN_ABORT_REQ_RCVD);
-	send_abort_rpl(c3cn, rst_status);
-
-	if (!c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING)) {
-		c3cn->err =
-		    abort_status_to_errno(c3cn, req->status, &rst_status);
-		c3cn_closed(c3cn);
-	}
-}
-
-static int do_abort_req(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
-{
-	const struct cpl_abort_req_rss *req = cplhdr(skb);
-	struct s3_conn *c3cn = ctx;
-
-	c3cn_conn_debug("rcv, c3cn 0x%p, s 0x%x, f 0x%lx.\n",
-			c3cn, c3cn->state, c3cn->flags);
-
-	if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
-	    req->status == CPL_ERR_PERSIST_NEG_ADVICE) {
-		__kfree_skb(skb);
-		return 0;
-	}
-
-	process_cpl_msg_ref(process_abort_req, c3cn, skb);
-	return 0;
-}
-
-/*
- * Process ABORT_RPL_RSS CPL message: -> host
- * Process abort replies.  We only process these messages if we anticipate
- * them as the coordination between SW and HW in this area is somewhat lacking
- * and sometimes we get ABORT_RPLs after we are done with the connection that
- * originated the ABORT_REQ.
- */
-static void process_abort_rpl(struct s3_conn *c3cn, struct sk_buff *skb)
-{
-	c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
-			c3cn, c3cn->state, c3cn->flags);
-
-	if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING)) {
-		if (!c3cn_flag(c3cn, C3CN_ABORT_RPL_RCVD))
-			c3cn_set_flag(c3cn, C3CN_ABORT_RPL_RCVD);
-		else {
-			c3cn_clear_flag(c3cn, C3CN_ABORT_RPL_RCVD);
-			c3cn_clear_flag(c3cn, C3CN_ABORT_RPL_PENDING);
-			if (c3cn_flag(c3cn, C3CN_ABORT_REQ_RCVD))
-				cxgb3i_log_error("%s tid %u, ABORT_RPL_RSS\n",
-						 c3cn->cdev->name, c3cn->tid);
-			c3cn_closed(c3cn);
-		}
-	}
-	__kfree_skb(skb);
-}
-
-static int do_abort_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
-{
-	struct cpl_abort_rpl_rss *rpl = cplhdr(skb);
-	struct s3_conn *c3cn = ctx;
-
-	c3cn_conn_debug("rcv, status 0x%x, c3cn 0x%p, s %u, 0x%lx.\n",
-			rpl->status, c3cn, c3cn ? c3cn->state : 0,
-			c3cn ? c3cn->flags : 0UL);
-
-	/*
-	 * Ignore replies to post-close aborts indicating that the abort was
-	 * requested too late.  These connections are terminated when we get
-	 * PEER_CLOSE or CLOSE_CON_RPL and by the time the abort_rpl_rss
-	 * arrives the TID is either no longer used or it has been recycled.
-	 */
-	if (rpl->status == CPL_ERR_ABORT_FAILED)
-		goto discard;
-
-	/*
-	 * Sometimes we've already closed the connection, e.g., a post-close
-	 * abort races with ABORT_REQ_RSS, the latter frees the connection
-	 * expecting the ABORT_REQ will fail with CPL_ERR_ABORT_FAILED,
-	 * but FW turns the ABORT_REQ into a regular one and so we get
-	 * ABORT_RPL_RSS with status 0 and no connection.
-	 */
-	if (!c3cn)
-		goto discard;
-
-	process_cpl_msg_ref(process_abort_rpl, c3cn, skb);
-	return 0;
-
-discard:
-	__kfree_skb(skb);
-	return 0;
-}
-
-/*
- * Process RX_ISCSI_HDR CPL message: -> host
- * Handle received PDUs, the payload could be DDP'ed. If not, the payload
- * follow after the bhs.
- */
-static void process_rx_iscsi_hdr(struct s3_conn *c3cn, struct sk_buff *skb)
-{
-	struct cpl_iscsi_hdr *hdr_cpl = cplhdr(skb);
-	struct cpl_iscsi_hdr_norss data_cpl;
-	struct cpl_rx_data_ddp_norss ddp_cpl;
-	unsigned int hdr_len, data_len, status;
-	unsigned int len;
-	int err;
-
-	if (unlikely(c3cn->state >= C3CN_STATE_PASSIVE_CLOSE)) {
-		if (c3cn->state != C3CN_STATE_ABORTING)
-			send_abort_req(c3cn);
-		__kfree_skb(skb);
-		return;
-	}
-
-	skb_tcp_seq(skb) = ntohl(hdr_cpl->seq);
-	skb_flags(skb) = 0;
-
-	skb_reset_transport_header(skb);
-	__skb_pull(skb, sizeof(struct cpl_iscsi_hdr));
-
-	len = hdr_len = ntohs(hdr_cpl->len);
-	/* msg coalesce is off or not enough data received */
-	if (skb->len <= hdr_len) {
-		cxgb3i_log_error("%s: TID %u, ISCSI_HDR, skb len %u < %u.\n",
-				 c3cn->cdev->name, c3cn->tid,
-				 skb->len, hdr_len);
-		goto abort_conn;
-	}
-
-	err = skb_copy_bits(skb, skb->len - sizeof(ddp_cpl), &ddp_cpl,
-			    sizeof(ddp_cpl));
-	if (err < 0)
-		goto abort_conn;
-
-	skb_ulp_mode(skb) = ULP2_FLAG_DATA_READY;
-	skb_rx_pdulen(skb) = ntohs(ddp_cpl.len);
-	skb_rx_ddigest(skb) = ntohl(ddp_cpl.ulp_crc);
-	status = ntohl(ddp_cpl.ddp_status);
-
-	c3cn_rx_debug("rx skb 0x%p, len %u, pdulen %u, ddp status 0x%x.\n",
-		      skb, skb->len, skb_rx_pdulen(skb), status);
-
-	if (status & (1 << RX_DDP_STATUS_HCRC_SHIFT))
-		skb_ulp_mode(skb) |= ULP2_FLAG_HCRC_ERROR;
-	if (status & (1 << RX_DDP_STATUS_DCRC_SHIFT))
-		skb_ulp_mode(skb) |= ULP2_FLAG_DCRC_ERROR;
-	if (status & (1 << RX_DDP_STATUS_PAD_SHIFT))
-		skb_ulp_mode(skb) |= ULP2_FLAG_PAD_ERROR;
-
-	if (skb->len > (hdr_len + sizeof(ddp_cpl))) {
-		err = skb_copy_bits(skb, hdr_len, &data_cpl, sizeof(data_cpl));
-		if (err < 0)
-			goto abort_conn;
-		data_len = ntohs(data_cpl.len);
-		len += sizeof(data_cpl) + data_len;
-	} else if (status & (1 << RX_DDP_STATUS_DDP_SHIFT))
-		skb_ulp_mode(skb) |= ULP2_FLAG_DATA_DDPED;
-
-	c3cn->rcv_nxt = ntohl(ddp_cpl.seq) + skb_rx_pdulen(skb);
-	__pskb_trim(skb, len);
-	__skb_queue_tail(&c3cn->receive_queue, skb);
-	cxgb3i_conn_pdu_ready(c3cn);
-
-	return;
-
-abort_conn:
-	send_abort_req(c3cn);
-	__kfree_skb(skb);
-}
-
-static int do_iscsi_hdr(struct t3cdev *t3dev, struct sk_buff *skb, void *ctx)
-{
-	struct s3_conn *c3cn = ctx;
-
-	process_cpl_msg(process_rx_iscsi_hdr, c3cn, skb);
-	return 0;
-}
-
-/*
- * Process TX_DATA_ACK CPL messages: -> host
- * Process an acknowledgment of WR completion.  Advance snd_una and send the
- * next batch of work requests from the write queue.
- */
-static void check_wr_invariants(struct s3_conn *c3cn)
-{
-	int pending = count_pending_wrs(c3cn);
-
-	if (unlikely(c3cn->wr_avail + pending != c3cn->wr_max))
-		cxgb3i_log_error("TID %u: credit imbalance: avail %u, "
-				"pending %u, total should be %u\n",
-				c3cn->tid, c3cn->wr_avail, pending,
-				c3cn->wr_max);
-}
-
-static void process_wr_ack(struct s3_conn *c3cn, struct sk_buff *skb)
-{
-	struct cpl_wr_ack *hdr = cplhdr(skb);
-	unsigned int credits = ntohs(hdr->credits);
-	u32 snd_una = ntohl(hdr->snd_una);
-
-	c3cn_tx_debug("%u WR credits, avail %u, unack %u, TID %u, state %u.\n",
-			credits, c3cn->wr_avail, c3cn->wr_unacked,
-			c3cn->tid, c3cn->state);
-
-	c3cn->wr_avail += credits;
-	if (c3cn->wr_unacked > c3cn->wr_max - c3cn->wr_avail)
-		c3cn->wr_unacked = c3cn->wr_max - c3cn->wr_avail;
-
-	while (credits) {
-		struct sk_buff *p = peek_wr(c3cn);
-
-		if (unlikely(!p)) {
-			cxgb3i_log_error("%u WR_ACK credits for TID %u with "
-					 "nothing pending, state %u\n",
-					 credits, c3cn->tid, c3cn->state);
-			break;
-		}
-		if (unlikely(credits < p->csum)) {
-			struct tx_data_wr *w = cplhdr(p);
-			cxgb3i_log_error("TID %u got %u WR credits need %u, "
-					 "len %u, main body %u, frags %u, "
-					 "seq # %u, ACK una %u, ACK nxt %u, "
-					 "WR_AVAIL %u, WRs pending %u\n",
-					 c3cn->tid, credits, p->csum, p->len,
-					 p->len - p->data_len,
-					 skb_shinfo(p)->nr_frags,
-					 ntohl(w->sndseq), snd_una,
-					 ntohl(hdr->snd_nxt), c3cn->wr_avail,
-					 count_pending_wrs(c3cn) - credits);
-			p->csum -= credits;
-			break;
-		} else {
-			dequeue_wr(c3cn);
-			credits -= p->csum;
-			free_wr_skb(p);
-		}
-	}
-
-	check_wr_invariants(c3cn);
-
-	if (unlikely(before(snd_una, c3cn->snd_una))) {
-		cxgb3i_log_error("TID %u, unexpected sequence # %u in WR_ACK "
-				 "snd_una %u\n",
-				 c3cn->tid, snd_una, c3cn->snd_una);
-		goto out_free;
-	}
-
-	if (c3cn->snd_una != snd_una) {
-		c3cn->snd_una = snd_una;
-		dst_confirm(c3cn->dst_cache);
-	}
-
-	if (skb_queue_len(&c3cn->write_queue)) {
-		if (c3cn_push_tx_frames(c3cn, 0))
-			cxgb3i_conn_tx_open(c3cn);
-	} else
-		cxgb3i_conn_tx_open(c3cn);
-out_free:
-	__kfree_skb(skb);
-}
-
-static int do_wr_ack(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
-{
-	struct s3_conn *c3cn = ctx;
-
-	process_cpl_msg(process_wr_ack, c3cn, skb);
-	return 0;
-}
-
-/*
- * for each connection, pre-allocate skbs needed for close/abort requests. So
- * that we can service the request right away.
- */
-static void c3cn_free_cpl_skbs(struct s3_conn *c3cn)
-{
-	if (c3cn->cpl_close)
-		kfree_skb(c3cn->cpl_close);
-	if (c3cn->cpl_abort_req)
-		kfree_skb(c3cn->cpl_abort_req);
-	if (c3cn->cpl_abort_rpl)
-		kfree_skb(c3cn->cpl_abort_rpl);
-}
-
-static int c3cn_alloc_cpl_skbs(struct s3_conn *c3cn)
-{
-	c3cn->cpl_close = alloc_skb(sizeof(struct cpl_close_con_req),
-				   GFP_KERNEL);
-	if (!c3cn->cpl_close)
-		return -ENOMEM;
-	skb_put(c3cn->cpl_close, sizeof(struct cpl_close_con_req));
-
-	c3cn->cpl_abort_req = alloc_skb(sizeof(struct cpl_abort_req),
-					GFP_KERNEL);
-	if (!c3cn->cpl_abort_req)
-		goto free_cpl_skbs;
-	skb_put(c3cn->cpl_abort_req, sizeof(struct cpl_abort_req));
-
-	c3cn->cpl_abort_rpl = alloc_skb(sizeof(struct cpl_abort_rpl),
-					GFP_KERNEL);
-	if (!c3cn->cpl_abort_rpl)
-		goto free_cpl_skbs;
-	skb_put(c3cn->cpl_abort_rpl, sizeof(struct cpl_abort_rpl));
-
-	return 0;
-
-free_cpl_skbs:
-	c3cn_free_cpl_skbs(c3cn);
-	return -ENOMEM;
-}
-
-/**
- * c3cn_release_offload_resources - release offload resource
- * @c3cn: the offloaded iscsi tcp connection.
- * Release resources held by an offload connection (TID, L2T entry, etc.)
- */
-static void c3cn_release_offload_resources(struct s3_conn *c3cn)
-{
-	struct t3cdev *cdev = c3cn->cdev;
-	unsigned int tid = c3cn->tid;
-
-	c3cn->qset = 0;
-	c3cn_free_cpl_skbs(c3cn);
-
-	if (c3cn->wr_avail != c3cn->wr_max) {
-		purge_wr_queue(c3cn);
-		reset_wr_list(c3cn);
-	}
-
-	if (cdev) {
-		if (c3cn->l2t) {
-			l2t_release(L2DATA(cdev), c3cn->l2t);
-			c3cn->l2t = NULL;
-		}
-		if (c3cn->state == C3CN_STATE_CONNECTING)
-			/* we have ATID */
-			s3_free_atid(cdev, tid);
-		else {
-			/* we have TID */
-			cxgb3_remove_tid(cdev, (void *)c3cn, tid);
-			c3cn_put(c3cn);
-		}
-	}
-
-	c3cn->dst_cache = NULL;
-	c3cn->cdev = NULL;
-}
-
-/**
- * cxgb3i_c3cn_create - allocate and initialize an s3_conn structure
- * returns the s3_conn structure allocated.
- */
-struct s3_conn *cxgb3i_c3cn_create(void)
-{
-	struct s3_conn *c3cn;
-
-	c3cn = kzalloc(sizeof(*c3cn), GFP_KERNEL);
-	if (!c3cn)
-		return NULL;
-
-	/* pre-allocate close/abort cpl, so we don't need to wait for memory
-	   when close/abort is requested. */
-	if (c3cn_alloc_cpl_skbs(c3cn) < 0)
-		goto free_c3cn;
-
-	c3cn_conn_debug("alloc c3cn 0x%p.\n", c3cn);
-
-	c3cn->flags = 0;
-	spin_lock_init(&c3cn->lock);
-	atomic_set(&c3cn->refcnt, 1);
-	skb_queue_head_init(&c3cn->receive_queue);
-	skb_queue_head_init(&c3cn->write_queue);
-	setup_timer(&c3cn->retry_timer, NULL, (unsigned long)c3cn);
-	rwlock_init(&c3cn->callback_lock);
-
-	return c3cn;
-
-free_c3cn:
-	kfree(c3cn);
-	return NULL;
-}
-
-static void c3cn_active_close(struct s3_conn *c3cn)
-{
-	int data_lost;
-	int close_req = 0;
-
-	c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
-			 c3cn, c3cn->state, c3cn->flags);
-
-	dst_confirm(c3cn->dst_cache);
-
-	c3cn_hold(c3cn);
-	spin_lock_bh(&c3cn->lock);
-
-	data_lost = skb_queue_len(&c3cn->receive_queue);
-	__skb_queue_purge(&c3cn->receive_queue);
-
-	switch (c3cn->state) {
-	case C3CN_STATE_CLOSED:
-	case C3CN_STATE_ACTIVE_CLOSE:
-	case C3CN_STATE_CLOSE_WAIT_1:
-	case C3CN_STATE_CLOSE_WAIT_2:
-	case C3CN_STATE_ABORTING:
-		/* nothing need to be done */
-		break;
-	case C3CN_STATE_CONNECTING:
-		/* defer until cpl_act_open_rpl or cpl_act_establish */
-		c3cn_set_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED);
-		break;
-	case C3CN_STATE_ESTABLISHED:
-		close_req = 1;
-		c3cn_set_state(c3cn, C3CN_STATE_ACTIVE_CLOSE);
-		break;
-	case C3CN_STATE_PASSIVE_CLOSE:
-		close_req = 1;
-		c3cn_set_state(c3cn, C3CN_STATE_CLOSE_WAIT_2);
-		break;
-	}
-
-	if (close_req) {
-		if (data_lost)
-			/* Unread data was tossed, zap the connection. */
-			send_abort_req(c3cn);
-		else
-			send_close_req(c3cn);
-	}
-
-	spin_unlock_bh(&c3cn->lock);
-	c3cn_put(c3cn);
-}
-
-/**
- * cxgb3i_c3cn_release - close and release an iscsi tcp connection and any
- * 	resource held
- * @c3cn: the iscsi tcp connection
- */
-void cxgb3i_c3cn_release(struct s3_conn *c3cn)
-{
-	c3cn_conn_debug("c3cn 0x%p, s %u, f 0x%lx.\n",
-			c3cn, c3cn->state, c3cn->flags);
-	if (unlikely(c3cn->state == C3CN_STATE_CONNECTING))
-		c3cn_set_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED);
-	else if (likely(c3cn->state != C3CN_STATE_CLOSED))
-		c3cn_active_close(c3cn);
-	c3cn_put(c3cn);
-}
-
-static int is_cxgb3_dev(struct net_device *dev)
-{
-	struct cxgb3i_sdev_data *cdata;
-	struct net_device *ndev = dev;
-
-	if (dev->priv_flags & IFF_802_1Q_VLAN)
-		ndev = vlan_dev_real_dev(dev);
-
-	write_lock(&cdata_rwlock);
-	list_for_each_entry(cdata, &cdata_list, list) {
-		struct adap_ports *ports = &cdata->ports;
-		int i;
-
-		for (i = 0; i < ports->nports; i++)
-			if (ndev == ports->lldevs[i]) {
-				write_unlock(&cdata_rwlock);
-				return 1;
-			}
-	}
-	write_unlock(&cdata_rwlock);
-	return 0;
-}
-
-/**
- * cxgb3_egress_dev - return the cxgb3 egress device
- * @root_dev: the root device anchoring the search
- * @c3cn: the connection used to determine egress port in bonding mode
- * @context: in bonding mode, indicates a connection set up or failover
- *
- * Return egress device or NULL if the egress device isn't one of our ports.
- */
-static struct net_device *cxgb3_egress_dev(struct net_device *root_dev,
-					   struct s3_conn *c3cn,
-					   int context)
-{
-	while (root_dev) {
-		if (root_dev->priv_flags & IFF_802_1Q_VLAN)
-			root_dev = vlan_dev_real_dev(root_dev);
-		else if (is_cxgb3_dev(root_dev))
-			return root_dev;
-		else
-			return NULL;
-	}
-	return NULL;
-}
-
-static struct rtable *find_route(struct net_device *dev,
-				 __be32 saddr, __be32 daddr,
-				 __be16 sport, __be16 dport)
-{
-	struct rtable *rt;
-	struct flowi fl = {
-		.oif = dev ? dev->ifindex : 0,
-		.nl_u = {
-			 .ip4_u = {
-				   .daddr = daddr,
-				   .saddr = saddr,
-				   .tos = 0 } },
-		.proto = IPPROTO_TCP,
-		.uli_u = {
-			  .ports = {
-				    .sport = sport,
-				    .dport = dport } } };
-
-	if (ip_route_output_flow(&init_net, &rt, &fl, NULL, 0))
-		return NULL;
-	return rt;
-}
-
-/*
- * Assign offload parameters to some connection fields.
- */
-static void init_offload_conn(struct s3_conn *c3cn,
-			      struct t3cdev *cdev,
-			      struct dst_entry *dst)
-{
-	BUG_ON(c3cn->cdev != cdev);
-	c3cn->wr_max = c3cn->wr_avail = T3C_DATA(cdev)->max_wrs - 1;
-	c3cn->wr_unacked = 0;
-	c3cn->mss_idx = select_mss(c3cn, dst_mtu(dst));
-
-	reset_wr_list(c3cn);
-}
-
-static int initiate_act_open(struct s3_conn *c3cn, struct net_device *dev)
-{
-	struct cxgb3i_sdev_data *cdata = NDEV2CDATA(dev);
-	struct t3cdev *cdev = cdata->cdev;
-	struct dst_entry *dst = c3cn->dst_cache;
-	struct sk_buff *skb;
-
-	c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
-			c3cn, c3cn->state, c3cn->flags);
-	/*
-	 * Initialize connection data.  Note that the flags and ULP mode are
-	 * initialized higher up ...
-	 */
-	c3cn->dev = dev;
-	c3cn->cdev = cdev;
-	c3cn->tid = cxgb3_alloc_atid(cdev, cdata->client, c3cn);
-	if (c3cn->tid < 0)
-		goto out_err;
-
-	c3cn->qset = 0;
-	c3cn->l2t = t3_l2t_get(cdev, dst->neighbour, dev);
-	if (!c3cn->l2t)
-		goto free_tid;
-
-	skb = alloc_skb(sizeof(struct cpl_act_open_req), GFP_KERNEL);
-	if (!skb)
-		goto free_l2t;
-
-	skb->sk = (struct sock *)c3cn;
-	set_arp_failure_handler(skb, act_open_req_arp_failure);
-
-	c3cn_hold(c3cn);
-
-	init_offload_conn(c3cn, cdev, dst);
-	c3cn->err = 0;
-
-	make_act_open_req(c3cn, skb, c3cn->tid, c3cn->l2t);
-	l2t_send(cdev, skb, c3cn->l2t);
-	return 0;
-
-free_l2t:
-	l2t_release(L2DATA(cdev), c3cn->l2t);
-free_tid:
-	s3_free_atid(cdev, c3cn->tid);
-	c3cn->tid = 0;
-out_err:
-	return -EINVAL;
-}
-
-/**
- * cxgb3i_find_dev - find the interface associated with the given address
- * @ipaddr: ip address
- */
-static struct net_device *
-cxgb3i_find_dev(struct net_device *dev, __be32 ipaddr)
-{
-	struct flowi fl;
-	int err;
-	struct rtable *rt;
-
-	memset(&fl, 0, sizeof(fl));
-	fl.nl_u.ip4_u.daddr = ipaddr;
-
-	err = ip_route_output_key(dev ? dev_net(dev) : &init_net, &rt, &fl);
-	if (!err)
-		return (&rt->dst)->dev;
-
-	return NULL;
-}
-
-/**
- * cxgb3i_c3cn_connect - initiates an iscsi tcp connection to a given address
- * @c3cn: the iscsi tcp connection
- * @usin: destination address
- *
- * return 0 if active open request is sent, < 0 otherwise.
- */
-int cxgb3i_c3cn_connect(struct net_device *dev, struct s3_conn *c3cn,
-			struct sockaddr_in *usin)
-{
-	struct rtable *rt;
-	struct cxgb3i_sdev_data *cdata;
-	struct t3cdev *cdev;
-	__be32 sipv4;
-	struct net_device *dstdev;
-	int err;
-
-	c3cn_conn_debug("c3cn 0x%p, dev 0x%p.\n", c3cn, dev);
-
-	if (usin->sin_family != AF_INET)
-		return -EAFNOSUPPORT;
-
-	c3cn->daddr.sin_port = usin->sin_port;
-	c3cn->daddr.sin_addr.s_addr = usin->sin_addr.s_addr;
-
-	dstdev = cxgb3i_find_dev(dev, usin->sin_addr.s_addr);
-	if (!dstdev || !is_cxgb3_dev(dstdev))
-		return -ENETUNREACH;
-
-	if (dstdev->priv_flags & IFF_802_1Q_VLAN)
-		dev = dstdev;
-
-	rt = find_route(dev, c3cn->saddr.sin_addr.s_addr,
-			c3cn->daddr.sin_addr.s_addr,
-			c3cn->saddr.sin_port,
-			c3cn->daddr.sin_port);
-	if (rt == NULL) {
-		c3cn_conn_debug("NO route to 0x%x, port %u, dev %s.\n",
-				c3cn->daddr.sin_addr.s_addr,
-				ntohs(c3cn->daddr.sin_port),
-				dev ? dev->name : "any");
-		return -ENETUNREACH;
-	}
-
-	if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
-		c3cn_conn_debug("multi-cast route to 0x%x, port %u, dev %s.\n",
-				c3cn->daddr.sin_addr.s_addr,
-				ntohs(c3cn->daddr.sin_port),
-				dev ? dev->name : "any");
-		ip_rt_put(rt);
-		return -ENETUNREACH;
-	}
-
-	if (!c3cn->saddr.sin_addr.s_addr)
-		c3cn->saddr.sin_addr.s_addr = rt->rt_src;
-
-	/* now commit destination to connection */
-	c3cn->dst_cache = &rt->dst;
-
-	/* try to establish an offloaded connection */
-	dev = cxgb3_egress_dev(c3cn->dst_cache->dev, c3cn, 0);
-	if (dev == NULL) {
-		c3cn_conn_debug("c3cn 0x%p, egress dev NULL.\n", c3cn);
-		return -ENETUNREACH;
-	}
-	cdata = NDEV2CDATA(dev);
-	cdev = cdata->cdev;
-
-	/* get a source port if one hasn't been provided */
-	err = c3cn_get_port(c3cn, cdata);
-	if (err)
-		return err;
-
-	c3cn_conn_debug("c3cn 0x%p get port %u.\n",
-			c3cn, ntohs(c3cn->saddr.sin_port));
-
-	sipv4 = cxgb3i_get_private_ipv4addr(dev);
-	if (!sipv4) {
-		c3cn_conn_debug("c3cn 0x%p, iscsi ip not configured.\n", c3cn);
-		sipv4 = c3cn->saddr.sin_addr.s_addr;
-		cxgb3i_set_private_ipv4addr(dev, sipv4);
-	} else
-		c3cn->saddr.sin_addr.s_addr = sipv4;
-
-	c3cn_conn_debug("c3cn 0x%p, %pI4,%u-%pI4,%u SYN_SENT.\n",
-			c3cn,
-			&c3cn->saddr.sin_addr.s_addr,
-			ntohs(c3cn->saddr.sin_port),
-			&c3cn->daddr.sin_addr.s_addr,
-			ntohs(c3cn->daddr.sin_port));
-
-	c3cn_set_state(c3cn, C3CN_STATE_CONNECTING);
-	if (!initiate_act_open(c3cn, dev))
-		return 0;
-
-	/*
-	 * If we get here, we don't have an offload connection so simply
-	 * return a failure.
-	 */
-	err = -ENOTSUPP;
-
-	/*
-	 * This trashes the connection and releases the local port,
-	 * if necessary.
-	 */
-	c3cn_conn_debug("c3cn 0x%p -> CLOSED.\n", c3cn);
-	c3cn_set_state(c3cn, C3CN_STATE_CLOSED);
-	ip_rt_put(rt);
-	c3cn_put_port(c3cn);
-	return err;
-}
-
-/**
- * cxgb3i_c3cn_rx_credits - ack received tcp data.
- * @c3cn: iscsi tcp connection
- * @copied: # of bytes processed
- *
- * Called after some received data has been read.  It returns RX credits
- * to the HW for the amount of data processed.
- */
-void cxgb3i_c3cn_rx_credits(struct s3_conn *c3cn, int copied)
-{
-	struct t3cdev *cdev;
-	int must_send;
-	u32 credits, dack = 0;
-
-	if (c3cn->state != C3CN_STATE_ESTABLISHED)
-		return;
-
-	credits = c3cn->copied_seq - c3cn->rcv_wup;
-	if (unlikely(!credits))
-		return;
-
-	cdev = c3cn->cdev;
-
-	if (unlikely(cxgb3_rx_credit_thres == 0))
-		return;
-
-	dack = F_RX_DACK_CHANGE | V_RX_DACK_MODE(1);
-
-	/*
-	 * For coalescing to work effectively ensure the receive window has
-	 * at least 16KB left.
-	 */
-	must_send = credits + 16384 >= cxgb3_rcv_win;
-
-	if (must_send || credits >= cxgb3_rx_credit_thres)
-		c3cn->rcv_wup += send_rx_credits(c3cn, credits, dack);
-}
-
-/**
- * cxgb3i_c3cn_send_pdus - send the skbs containing iscsi pdus
- * @c3cn: iscsi tcp connection
- * @skb: skb contains the iscsi pdu
- *
- * Add a list of skbs to a connection send queue. The skbs must comply with
- * the max size limit of the device and have a headroom of at least
- * TX_HEADER_LEN bytes.
- * Return # of bytes queued.
- */
-int cxgb3i_c3cn_send_pdus(struct s3_conn *c3cn, struct sk_buff *skb)
-{
-	struct sk_buff *next;
-	int err, copied = 0;
-
-	spin_lock_bh(&c3cn->lock);
-
-	if (c3cn->state != C3CN_STATE_ESTABLISHED) {
-		c3cn_tx_debug("c3cn 0x%p, not in est. state %u.\n",
-			      c3cn, c3cn->state);
-		err = -EAGAIN;
-		goto out_err;
-	}
-
-	if (c3cn->err) {
-		c3cn_tx_debug("c3cn 0x%p, err %d.\n", c3cn, c3cn->err);
-		err = -EPIPE;
-		goto out_err;
-	}
-
-	if (c3cn->write_seq - c3cn->snd_una >= cxgb3_snd_win) {
-		c3cn_tx_debug("c3cn 0x%p, snd %u - %u > %u.\n",
-				c3cn, c3cn->write_seq, c3cn->snd_una,
-				cxgb3_snd_win);
-		err = -ENOBUFS;
-		goto out_err;
-	}
-
-	while (skb) {
-		int frags = skb_shinfo(skb)->nr_frags +
-				(skb->len != skb->data_len);
-
-		if (unlikely(skb_headroom(skb) < TX_HEADER_LEN)) {
-			c3cn_tx_debug("c3cn 0x%p, skb head.\n", c3cn);
-			err = -EINVAL;
-			goto out_err;
-		}
-
-		if (frags >= SKB_WR_LIST_SIZE) {
-			cxgb3i_log_error("c3cn 0x%p, tx frags %d, len %u,%u.\n",
-					 c3cn, skb_shinfo(skb)->nr_frags,
-					 skb->len, skb->data_len);
-			err = -EINVAL;
-			goto out_err;
-		}
-
-		next = skb->next;
-		skb->next = NULL;
-		skb_entail(c3cn, skb, C3CB_FLAG_NO_APPEND | C3CB_FLAG_NEED_HDR);
-		copied += skb->len;
-		c3cn->write_seq += skb->len + ulp_extra_len(skb);
-		skb = next;
-	}
-done:
-	if (likely(skb_queue_len(&c3cn->write_queue)))
-		c3cn_push_tx_frames(c3cn, 1);
-	spin_unlock_bh(&c3cn->lock);
-	return copied;
-
-out_err:
-	if (copied == 0 && err == -EPIPE)
-		copied = c3cn->err ? c3cn->err : -EPIPE;
-	else
-		copied = err;
-	goto done;
-}
-
-static void sdev_data_cleanup(struct cxgb3i_sdev_data *cdata)
-{
-	struct adap_ports *ports = &cdata->ports;
-	struct s3_conn *c3cn;
-	int i;
-
-	for (i = 0; i < cxgb3_max_connect; i++) {
-		if (cdata->sport_conn[i]) {
-			c3cn = cdata->sport_conn[i];
-			cdata->sport_conn[i] = NULL;
-
-			spin_lock_bh(&c3cn->lock);
-			c3cn->cdev = NULL;
-			c3cn_set_flag(c3cn, C3CN_OFFLOAD_DOWN);
-			c3cn_closed(c3cn);
-			spin_unlock_bh(&c3cn->lock);
-		}
-	}
-
-	for (i = 0; i < ports->nports; i++)
-		NDEV2CDATA(ports->lldevs[i]) = NULL;
-
-	cxgb3i_free_big_mem(cdata);
-}
-
-void cxgb3i_sdev_cleanup(void)
-{
-	struct cxgb3i_sdev_data *cdata;
-
-	write_lock(&cdata_rwlock);
-	list_for_each_entry(cdata, &cdata_list, list) {
-		list_del(&cdata->list);
-		sdev_data_cleanup(cdata);
-	}
-	write_unlock(&cdata_rwlock);
-}
-
-int cxgb3i_sdev_init(cxgb3_cpl_handler_func *cpl_handlers)
-{
-	cpl_handlers[CPL_ACT_ESTABLISH] = do_act_establish;
-	cpl_handlers[CPL_ACT_OPEN_RPL] = do_act_open_rpl;
-	cpl_handlers[CPL_PEER_CLOSE] = do_peer_close;
-	cpl_handlers[CPL_ABORT_REQ_RSS] = do_abort_req;
-	cpl_handlers[CPL_ABORT_RPL_RSS] = do_abort_rpl;
-	cpl_handlers[CPL_CLOSE_CON_RPL] = do_close_con_rpl;
-	cpl_handlers[CPL_TX_DMA_ACK] = do_wr_ack;
-	cpl_handlers[CPL_ISCSI_HDR] = do_iscsi_hdr;
-
-	if (cxgb3_max_connect > CXGB3I_MAX_CONN)
-		cxgb3_max_connect = CXGB3I_MAX_CONN;
-	return 0;
-}
-
-/**
- * cxgb3i_sdev_add - allocate and initialize resources for each adapter found
- * @cdev:	t3cdev adapter
- * @client:	cxgb3 driver client
- */
-void cxgb3i_sdev_add(struct t3cdev *cdev, struct cxgb3_client *client)
-{
-	struct cxgb3i_sdev_data *cdata;
-	struct ofld_page_info rx_page_info;
-	unsigned int wr_len;
-	int mapsize = cxgb3_max_connect * sizeof(struct s3_conn *);
-	int i;
-
-	cdata =  cxgb3i_alloc_big_mem(sizeof(*cdata) + mapsize, GFP_KERNEL);
-	if (!cdata) {
-		cxgb3i_log_warn("t3dev 0x%p, offload up, OOM %d.\n",
-				cdev, mapsize);
-		return;
-	}
-
-	if (cdev->ctl(cdev, GET_WR_LEN, &wr_len) < 0 ||
-	    cdev->ctl(cdev, GET_PORTS, &cdata->ports) < 0 ||
-	    cdev->ctl(cdev, GET_RX_PAGE_INFO, &rx_page_info) < 0) {
-		cxgb3i_log_warn("t3dev 0x%p, offload up, ioctl failed.\n",
-				cdev);
-		goto free_cdata;
-	}
-
-	s3_init_wr_tab(wr_len);
-
-	spin_lock_init(&cdata->lock);
-	INIT_LIST_HEAD(&cdata->list);
-	cdata->cdev = cdev;
-	cdata->client = client;
-
-	for (i = 0; i < cdata->ports.nports; i++)
-		NDEV2CDATA(cdata->ports.lldevs[i]) = cdata;
-
-	write_lock(&cdata_rwlock);
-	list_add_tail(&cdata->list, &cdata_list);
-	write_unlock(&cdata_rwlock);
-
-	cxgb3i_log_info("t3dev 0x%p, offload up, added.\n", cdev);
-	return;
-
-free_cdata:
-	cxgb3i_free_big_mem(cdata);
-}
-
-/**
- * cxgb3i_sdev_remove - free the allocated resources for the adapter
- * @cdev:	t3cdev adapter
- */
-void cxgb3i_sdev_remove(struct t3cdev *cdev)
-{
-	struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(cdev);
-
-	cxgb3i_log_info("t3dev 0x%p, offload down, remove.\n", cdev);
-
-	write_lock(&cdata_rwlock);
-	list_del(&cdata->list);
-	write_unlock(&cdata_rwlock);
-
-	sdev_data_cleanup(cdata);
-}

drivers/scsi/cxgb3i/cxgb3i_offload.h

···
-/*
- * cxgb3i_offload.h: Chelsio S3xx iscsi offloaded tcp connection management
- *
- * Copyright (C) 2003-2008 Chelsio Communications.  All rights reserved.
- *
- * 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 LICENSE file included in this
- * release for licensing terms and conditions.
- *
- * Written by:	Dimitris Michailidis ([e-mail])
- *		Karen Xie ([e-mail])
- */
-
-#ifndef _CXGB3I_OFFLOAD_H
-#define _CXGB3I_OFFLOAD_H
-
-#include <linux/skbuff.h>
-#include <linux/in.h>
-
-#include "common.h"
-#include "adapter.h"
-#include "t3cdev.h"
-#include "cxgb3_offload.h"
-
-#define cxgb3i_log_error(fmt...) printk(KERN_ERR "cxgb3i: ERR! " fmt)
-#define cxgb3i_log_warn(fmt...)	 printk(KERN_WARNING "cxgb3i: WARN! " fmt)
-#define cxgb3i_log_info(fmt...)  printk(KERN_INFO "cxgb3i: " fmt)
-#define cxgb3i_log_debug(fmt, args...) \
-	printk(KERN_INFO "cxgb3i: %s - " fmt, __func__ , ## args)
-
-/**
- * struct s3_conn - an iscsi tcp connection structure
- *
- * @dev:	net device of with connection
- * @cdev:	adapter t3cdev for net device
- * @flags:	see c3cn_flags below
- * @tid:	connection id assigned by the h/w
- * @qset:	queue set used by connection
- * @mss_idx:	Maximum Segment Size table index
- * @l2t:	ARP resolution entry for offload packets
- * @wr_max:	maximum in-flight writes
- * @wr_avail:	number of writes available
- * @wr_unacked:	writes since last request for completion notification
- * @wr_pending_head: head of pending write queue
- * @wr_pending_tail: tail of pending write queue
- * @cpl_close:	skb for cpl_close_req
- * @cpl_abort_req: skb for cpl_abort_req
- * @cpl_abort_rpl: skb for cpl_abort_rpl
- * @lock:	connection status lock
- * @refcnt:	reference count on connection
- * @state:	connection state
- * @saddr:	source ip/port address
- * @daddr:	destination ip/port address
- * @dst_cache:	reference to destination route
- * @receive_queue: received PDUs
- * @write_queue: un-pushed pending writes
- * @retry_timer: retry timer for various operations
- * @err:	connection error status
- * @callback_lock: lock for opaque user context
- * @user_data:	opaque user context
- * @rcv_nxt:	next receive seq. #
- * @copied_seq:	head of yet unread data
- * @rcv_wup:	rcv_nxt on last window update sent
- * @snd_nxt:	next sequence we send
- * @snd_una:	first byte we want an ack for
- * @write_seq:	tail+1 of data held in send buffer
- */
-struct s3_conn {
-	struct net_device *dev;
-	struct t3cdev *cdev;
-	unsigned long flags;
-	int tid;
-	int qset;
-	int mss_idx;
-	struct l2t_entry *l2t;
-	int wr_max;
-	int wr_avail;
-	int wr_unacked;
-	struct sk_buff *wr_pending_head;
-	struct sk_buff *wr_pending_tail;
-	struct sk_buff *cpl_close;
-	struct sk_buff *cpl_abort_req;
-	struct sk_buff *cpl_abort_rpl;
-	spinlock_t lock;
-	atomic_t refcnt;
-	volatile unsigned int state;
-	struct sockaddr_in saddr;
-	struct sockaddr_in daddr;
-	struct dst_entry *dst_cache;
-	struct sk_buff_head receive_queue;
-	struct sk_buff_head write_queue;
-	struct timer_list retry_timer;
-	int err;
-	rwlock_t callback_lock;
-	void *user_data;
-
-	u32 rcv_nxt;
-	u32 copied_seq;
-	u32 rcv_wup;
-	u32 snd_nxt;
-	u32 snd_una;
-	u32 write_seq;
-};
-
-/*
- * connection state
- */
-enum conn_states {
-	C3CN_STATE_CONNECTING = 1,
-	C3CN_STATE_ESTABLISHED,
-	C3CN_STATE_ACTIVE_CLOSE,
-	C3CN_STATE_PASSIVE_CLOSE,
-	C3CN_STATE_CLOSE_WAIT_1,
-	C3CN_STATE_CLOSE_WAIT_2,
-	C3CN_STATE_ABORTING,
-	C3CN_STATE_CLOSED,
-};
-
-static inline unsigned int c3cn_is_closing(const struct s3_conn *c3cn)
-{
-	return c3cn->state >= C3CN_STATE_ACTIVE_CLOSE;
-}
-static inline unsigned int c3cn_is_established(const struct s3_conn *c3cn)
-{
-	return c3cn->state == C3CN_STATE_ESTABLISHED;
-}
-
-/*
- * Connection flags -- many to track some close related events.
- */
-enum c3cn_flags {
-	C3CN_ABORT_RPL_RCVD,	/* received one ABORT_RPL_RSS message */
-	C3CN_ABORT_REQ_RCVD,	/* received one ABORT_REQ_RSS message */
-	C3CN_ABORT_RPL_PENDING,	/* expecting an abort reply */
-	C3CN_TX_DATA_SENT,	/* already sent a TX_DATA WR */
-	C3CN_ACTIVE_CLOSE_NEEDED,	/* need to be closed */
-	C3CN_OFFLOAD_DOWN	/* offload function off */
-};
-
-/**
- * cxgb3i_sdev_data - Per adapter data.
- * Linked off of each Ethernet device port on the adapter.
- * Also available via the t3cdev structure since we have pointers to our port
- * net_device's there ...
- *
- * @list:	list head to link elements
- * @cdev:	t3cdev adapter
- * @client:	CPL client pointer
- * @ports:	array of adapter ports
- * @sport_next: next port
- * @sport_conn:	source port connection
- */
-struct cxgb3i_sdev_data {
-	struct list_head list;
-	struct t3cdev *cdev;
-	struct cxgb3_client *client;
-	struct adap_ports ports;
-	spinlock_t lock;
-	unsigned int sport_next;
-	struct s3_conn *sport_conn[0];
-};
-#define NDEV2CDATA(ndev) (*(struct cxgb3i_sdev_data **)&(ndev)->ec_ptr)
-#define CXGB3_SDEV_DATA(cdev) NDEV2CDATA((cdev)->lldev)
-
-void cxgb3i_sdev_cleanup(void);
-int cxgb3i_sdev_init(cxgb3_cpl_handler_func *);
-void cxgb3i_sdev_add(struct t3cdev *, struct cxgb3_client *);
-void cxgb3i_sdev_remove(struct t3cdev *);
-
-struct s3_conn *cxgb3i_c3cn_create(void);
-int cxgb3i_c3cn_connect(struct net_device *, struct s3_conn *,
-			struct sockaddr_in *);
-void cxgb3i_c3cn_rx_credits(struct s3_conn *, int);
-int cxgb3i_c3cn_send_pdus(struct s3_conn *, struct sk_buff *);
-void cxgb3i_c3cn_release(struct s3_conn *);
-
-/**
- * cxgb3_skb_cb - control block for received pdu state and ULP mode management.
- *
- * @flag:	see C3CB_FLAG_* below
- * @ulp_mode:	ULP mode/submode of sk_buff
- * @seq:	tcp sequence number
- */
-struct cxgb3_skb_rx_cb {
-	__u32 ddigest;			/* data digest */
-	__u32 pdulen;			/* recovered pdu length */
-};
-
-struct cxgb3_skb_tx_cb {
-	struct sk_buff *wr_next;	/* next wr */
-};
-
-struct cxgb3_skb_cb {
-	__u8 flags;
-	__u8 ulp_mode;
-	__u32 seq;
-	union {
-		struct cxgb3_skb_rx_cb rx;
-		struct cxgb3_skb_tx_cb tx;
-	};
-};
-
-#define CXGB3_SKB_CB(skb)	((struct cxgb3_skb_cb *)&((skb)->cb[0]))
-#define skb_flags(skb)		(CXGB3_SKB_CB(skb)->flags)
-#define skb_ulp_mode(skb)	(CXGB3_SKB_CB(skb)->ulp_mode)
-#define skb_tcp_seq(skb)	(CXGB3_SKB_CB(skb)->seq)
-#define skb_rx_ddigest(skb)	(CXGB3_SKB_CB(skb)->rx.ddigest)
-#define skb_rx_pdulen(skb)	(CXGB3_SKB_CB(skb)->rx.pdulen)
-#define skb_tx_wr_next(skb)	(CXGB3_SKB_CB(skb)->tx.wr_next)
-
-enum c3cb_flags {
-	C3CB_FLAG_NEED_HDR = 1 << 0,	/* packet needs a TX_DATA_WR header */
-	C3CB_FLAG_NO_APPEND = 1 << 1,	/* don't grow this skb */
-	C3CB_FLAG_COMPL = 1 << 2,	/* request WR completion */
-};
-
-/**
- * sge_opaque_hdr -
- * Opaque version of structure the SGE stores at skb->head of TX_DATA packets
- * and for which we must reserve space.
- */
-struct sge_opaque_hdr {
-	void *dev;
-	dma_addr_t addr[MAX_SKB_FRAGS + 1];
-};
-
-/* for TX: a skb must have a headroom of at least TX_HEADER_LEN bytes */
-#define TX_HEADER_LEN \
-		(sizeof(struct tx_data_wr) + sizeof(struct sge_opaque_hdr))
-#define SKB_TX_HEADROOM		SKB_MAX_HEAD(TX_HEADER_LEN)
-
-/*
- * get and set private ip for iscsi traffic
- */
-#define cxgb3i_get_private_ipv4addr(ndev) \
-	(((struct port_info *)(netdev_priv(ndev)))->iscsi_ipv4addr)
-#define cxgb3i_set_private_ipv4addr(ndev, addr) \
-	(((struct port_info *)(netdev_priv(ndev)))->iscsi_ipv4addr) = addr
-
-/* max. connections per adapter */
-#define CXGB3I_MAX_CONN		16384
-#endif /* _CXGB3_OFFLOAD_H */

drivers/scsi/cxgb3i/cxgb3i_pdu.c

···
-/*
- * cxgb3i_pdu.c: Chelsio S3xx iSCSI driver.
- *
- * Copyright (c) 2008 Chelsio Communications, Inc.
- * Copyright (c) 2008 Mike Christie
- * Copyright (c) 2008 Red Hat, Inc.  All rights reserved.
- *
- * 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.
- *
- * Written by: Karen Xie ([e-mail])
- */
-
-#include <linux/slab.h>
-#include <linux/skbuff.h>
-#include <linux/crypto.h>
-#include <scsi/scsi_cmnd.h>
-#include <scsi/scsi_host.h>
-
-#include "cxgb3i.h"
-#include "cxgb3i_pdu.h"
-
-#ifdef __DEBUG_CXGB3I_RX__
-#define cxgb3i_rx_debug		cxgb3i_log_debug
-#else
-#define cxgb3i_rx_debug(fmt...)
-#endif
-
-#ifdef __DEBUG_CXGB3I_TX__
-#define cxgb3i_tx_debug		cxgb3i_log_debug
-#else
-#define cxgb3i_tx_debug(fmt...)
-#endif
-
-/* always allocate rooms for AHS */
-#define SKB_TX_PDU_HEADER_LEN	\
-	(sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE)
-static unsigned int skb_extra_headroom;
-static struct page *pad_page;
-
-/*
- * pdu receive, interact with libiscsi_tcp
- */
-static inline int read_pdu_skb(struct iscsi_conn *conn, struct sk_buff *skb,
-			       unsigned int offset, int offloaded)
-{
-	int status = 0;
-	int bytes_read;
-
-	bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
-	switch (status) {
-	case ISCSI_TCP_CONN_ERR:
-		return -EIO;
-	case ISCSI_TCP_SUSPENDED:
-		/* no transfer - just have caller flush queue */
-		return bytes_read;
-	case ISCSI_TCP_SKB_DONE:
-		/*
-		 * pdus should always fit in the skb and we should get
-		 * segment done notifcation.
-		 */
-		iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
-		return -EFAULT;
-	case ISCSI_TCP_SEGMENT_DONE:
-		return bytes_read;
-	default:
-		iscsi_conn_printk(KERN_ERR, conn, "Invalid iscsi_tcp_recv_skb "
-				  "status %d\n", status);
-		return -EINVAL;
-	}
-}
-
-static int cxgb3i_conn_read_pdu_skb(struct iscsi_conn *conn,
-				    struct sk_buff *skb)
-{
-	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
-	bool offloaded = 0;
-	unsigned int offset;
-	int rc;
-
-	cxgb3i_rx_debug("conn 0x%p, skb 0x%p, len %u, flag 0x%x.\n",
-			conn, skb, skb->len, skb_ulp_mode(skb));
-
-	if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
-		iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
-		return -EIO;
-	}
-
-	if (conn->hdrdgst_en && (skb_ulp_mode(skb) & ULP2_FLAG_HCRC_ERROR)) {
-		iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
-		return -EIO;
-	}
-
-	if (conn->datadgst_en && (skb_ulp_mode(skb) & ULP2_FLAG_DCRC_ERROR)) {
-		iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
-		return -EIO;
-	}
-
-	/* iscsi hdr */
-	rc = read_pdu_skb(conn, skb, 0, 0);
-	if (rc <= 0)
-		return rc;
-
-	if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
-		return 0;
-
-	offset = rc;
-	if (conn->hdrdgst_en)
-		offset += ISCSI_DIGEST_SIZE;
-
-	/* iscsi data */
-	if (skb_ulp_mode(skb) & ULP2_FLAG_DATA_DDPED) {
-		cxgb3i_rx_debug("skb 0x%p, opcode 0x%x, data %u, ddp'ed, "
-				"itt 0x%x.\n",
-				skb,
-				tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK,
-				tcp_conn->in.datalen,
-				ntohl(tcp_conn->in.hdr->itt));
-		offloaded = 1;
-	} else {
-		cxgb3i_rx_debug("skb 0x%p, opcode 0x%x, data %u, NOT ddp'ed, "
-				"itt 0x%x.\n",
-				skb,
-				tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK,
-				tcp_conn->in.datalen,
-				ntohl(tcp_conn->in.hdr->itt));
-		offset += sizeof(struct cpl_iscsi_hdr_norss);
-	}
-
-	rc = read_pdu_skb(conn, skb, offset, offloaded);
-	if (rc < 0)
-		return rc;
-	else
-		return 0;
-}
-
-/*
- * pdu transmit, interact with libiscsi_tcp
- */
-static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
-{
-	u8 submode = 0;
-
-	if (hcrc)
-		submode |= 1;
-	if (dcrc)
-		submode |= 2;
-	skb_ulp_mode(skb) = (ULP_MODE_ISCSI << 4) | submode;
-}
-
-void cxgb3i_conn_cleanup_task(struct iscsi_task *task)
-{
-	struct cxgb3i_task_data *tdata = task->dd_data +
-					sizeof(struct iscsi_tcp_task);
-
-	/* never reached the xmit task callout */
-	if (tdata->skb)
-		__kfree_skb(tdata->skb);
-	memset(tdata, 0, sizeof(struct cxgb3i_task_data));
-
-	/* MNC - Do we need a check in case this is called but
-	 * cxgb3i_conn_alloc_pdu has never been called on the task */
-	cxgb3i_release_itt(task, task->hdr_itt);
-	iscsi_tcp_cleanup_task(task);
-}
-
-static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
-				unsigned int offset, unsigned int *off,
-				struct scatterlist **sgp)
-{
-	int i;
-	struct scatterlist *sg;
-
-	for_each_sg(sgl, sg, sgcnt, i) {
-		if (offset < sg->length) {
-			*off = offset;
-			*sgp = sg;
-			return 0;
-		}
-		offset -= sg->length;
-	}
-	return -EFAULT;
-}
-
-static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
-				unsigned int dlen, skb_frag_t *frags,
-				int frag_max)
-{
-	unsigned int datalen = dlen;
-	unsigned int sglen = sg->length - sgoffset;
-	struct page *page = sg_page(sg);
-	int i;
-
-	i = 0;
-	do {
-		unsigned int copy;
-
-		if (!sglen) {
-			sg = sg_next(sg);
-			if (!sg) {
-				cxgb3i_log_error("%s, sg NULL, len %u/%u.\n",
-						 __func__, datalen, dlen);
-				return -EINVAL;
-			}
-			sgoffset = 0;
-			sglen = sg->length;
-			page = sg_page(sg);
-
-		}
-		copy = min(datalen, sglen);
-		if (i && page == frags[i - 1].page &&
-		    sgoffset + sg->offset ==
-			frags[i - 1].page_offset + frags[i - 1].size) {
-			frags[i - 1].size += copy;
-		} else {
-			if (i >= frag_max) {
-				cxgb3i_log_error("%s, too many pages %u, "
-						 "dlen %u.\n", __func__,
-						 frag_max, dlen);
-				return -EINVAL;
-			}
-
-			frags[i].page = page;
-			frags[i].page_offset = sg->offset + sgoffset;
-			frags[i].size = copy;
-			i++;
-		}
-		datalen -= copy;
-		sgoffset += copy;
-		sglen -= copy;
-	} while (datalen);
-
-	return i;
-}
-
-int cxgb3i_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
-{
-	struct iscsi_conn *conn = task->conn;
-	struct iscsi_tcp_task *tcp_task = task->dd_data;
-	struct cxgb3i_task_data *tdata = task->dd_data + sizeof(*tcp_task);
-	struct scsi_cmnd *sc = task->sc;
-	int headroom = SKB_TX_PDU_HEADER_LEN;
-
-	tcp_task->dd_data = tdata;
-	task->hdr = NULL;
-
-	/* write command, need to send data pdus */
-	if (skb_extra_headroom && (opcode == ISCSI_OP_SCSI_DATA_OUT ||
-	    (opcode == ISCSI_OP_SCSI_CMD &&
-	    (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
-		headroom += min(skb_extra_headroom, conn->max_xmit_dlength);
-
-	tdata->skb = alloc_skb(TX_HEADER_LEN + headroom, GFP_ATOMIC);
-	if (!tdata->skb)
-		return -ENOMEM;
-	skb_reserve(tdata->skb, TX_HEADER_LEN);
-
-	cxgb3i_tx_debug("task 0x%p, opcode 0x%x, skb 0x%p.\n",
-			task, opcode, tdata->skb);
-
-	task->hdr = (struct iscsi_hdr *)tdata->skb->data;
-	task->hdr_max = SKB_TX_PDU_HEADER_LEN;
-
-	/* data_out uses scsi_cmd's itt */
-	if (opcode != ISCSI_OP_SCSI_DATA_OUT)
-		cxgb3i_reserve_itt(task, &task->hdr->itt);
-
-	return 0;
-}
-
-int cxgb3i_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
-			      unsigned int count)
-{
-	struct iscsi_conn *conn = task->conn;
-	struct iscsi_tcp_task *tcp_task = task->dd_data;
-	struct cxgb3i_task_data *tdata = tcp_task->dd_data;
-	struct sk_buff *skb = tdata->skb;
-	unsigned int datalen = count;
-	int i, padlen = iscsi_padding(count);
-	struct page *pg;
-
-	cxgb3i_tx_debug("task 0x%p,0x%p, offset %u, count %u, skb 0x%p.\n",
-			task, task->sc, offset, count, skb);
-
-	skb_put(skb, task->hdr_len);
-	tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
-	if (!count)
-		return 0;
-
-	if (task->sc) {
-		struct scsi_data_buffer *sdb = scsi_out(task->sc);
-		struct scatterlist *sg = NULL;
-		int err;
-
-		tdata->offset = offset;
-		tdata->count = count;
-		err = sgl_seek_offset(sdb->table.sgl, sdb->table.nents,
-					tdata->offset, &tdata->sgoffset, &sg);
-		if (err < 0) {
-			cxgb3i_log_warn("tpdu, sgl %u, bad offset %u/%u.\n",
-					sdb->table.nents, tdata->offset,
-					sdb->length);
-			return err;
-		}
-		err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
-					tdata->frags, MAX_PDU_FRAGS);
-		if (err < 0) {
-			cxgb3i_log_warn("tpdu, sgl %u, bad offset %u + %u.\n",
-					sdb->table.nents, tdata->offset,
-					tdata->count);
-			return err;
-		}
-		tdata->nr_frags = err;
-
-		if (tdata->nr_frags > MAX_SKB_FRAGS ||
-		    (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
-			char *dst = skb->data + task->hdr_len;
-			skb_frag_t *frag = tdata->frags;
-
-			/* data fits in the skb's headroom */
-			for (i = 0; i < tdata->nr_frags; i++, frag++) {
-				char *src = kmap_atomic(frag->page,
-							KM_SOFTIRQ0);
-
-				memcpy(dst, src+frag->page_offset, frag->size);
-				dst += frag->size;
-				kunmap_atomic(src, KM_SOFTIRQ0);
-			}
-			if (padlen) {
-				memset(dst, 0, padlen);
-				padlen = 0;
-			}
-			skb_put(skb, count + padlen);
-		} else {
-			/* data fit into frag_list */
-			for (i = 0; i < tdata->nr_frags; i++)
-				get_page(tdata->frags[i].page);
-
-			memcpy(skb_shinfo(skb)->frags, tdata->frags,
-				sizeof(skb_frag_t) * tdata->nr_frags);
-			skb_shinfo(skb)->nr_frags = tdata->nr_frags;
-			skb->len += count;
-			skb->data_len += count;
-			skb->truesize += count;
-		}
-
-	} else {
-		pg = virt_to_page(task->data);
-
-		get_page(pg);
-		skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
-					count);
-		skb->len += count;
-		skb->data_len += count;
-		skb->truesize += count;
-	}
-
-	if (padlen) {
-		i = skb_shinfo(skb)->nr_frags;
-		get_page(pad_page);
-		skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, pad_page, 0,
-				 padlen);
-
-		skb->data_len += padlen;
-		skb->truesize += padlen;
-		skb->len += padlen;
-	}
-
-	return 0;
-}
-
-int cxgb3i_conn_xmit_pdu(struct iscsi_task *task)
-{
-	struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
-	struct cxgb3i_conn *cconn = tcp_conn->dd_data;
-	struct iscsi_tcp_task *tcp_task = task->dd_data;
-	struct cxgb3i_task_data *tdata = tcp_task->dd_data;
-	struct sk_buff *skb = tdata->skb;
-	unsigned int datalen;
-	int err;
-
-	if (!skb)
-		return 0;
-
-	datalen = skb->data_len;
-	tdata->skb = NULL;
-	err = cxgb3i_c3cn_send_pdus(cconn->cep->c3cn, skb);
-	if (err > 0) {
-		int pdulen = err;
-
-		cxgb3i_tx_debug("task 0x%p, skb 0x%p, len %u/%u, rv %d.\n",
-				task, skb, skb->len, skb->data_len, err);
-
-		if (task->conn->hdrdgst_en)
-			pdulen += ISCSI_DIGEST_SIZE;
-		if (datalen && task->conn->datadgst_en)
-			pdulen += ISCSI_DIGEST_SIZE;
-
-		task->conn->txdata_octets += pdulen;
-		return 0;
-	}
-
-	if (err == -EAGAIN || err == -ENOBUFS) {
-		/* reset skb to send when we are called again */
-		tdata->skb = skb;
-		return err;
-	}
-
-	kfree_skb(skb);
-	cxgb3i_tx_debug("itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
-			task->itt, skb, skb->len, skb->data_len, err);
-	iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
-	iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
-	return err;
-}
-
-int cxgb3i_pdu_init(void)
-{
-	if (SKB_TX_HEADROOM > (512 * MAX_SKB_FRAGS))
-		skb_extra_headroom = SKB_TX_HEADROOM;
-	pad_page = alloc_page(GFP_KERNEL);
-	if (!pad_page)
-		return -ENOMEM;
-	memset(page_address(pad_page), 0, PAGE_SIZE);
-	return 0;
-}
-
-void cxgb3i_pdu_cleanup(void)
-{
-	if (pad_page) {
-		__free_page(pad_page);
-		pad_page = NULL;
-	}
-}
-
-void cxgb3i_conn_pdu_ready(struct s3_conn *c3cn)
-{
-	struct sk_buff *skb;
-	unsigned int read = 0;
-	struct iscsi_conn *conn = c3cn->user_data;
-	int err = 0;
-
-	cxgb3i_rx_debug("cn 0x%p.\n", c3cn);
-
-	read_lock(&c3cn->callback_lock);
-	if (unlikely(!conn || conn->suspend_rx)) {
-		cxgb3i_rx_debug("conn 0x%p, id %d, suspend_rx %lu!\n",
-				conn, conn ? conn->id : 0xFF,
-				conn ? conn->suspend_rx : 0xFF);
-		read_unlock(&c3cn->callback_lock);
-		return;
-	}
-	skb = skb_peek(&c3cn->receive_queue);
-	while (!err && skb) {
-		__skb_unlink(skb, &c3cn->receive_queue);
-		read += skb_rx_pdulen(skb);
-		cxgb3i_rx_debug("conn 0x%p, cn 0x%p, rx skb 0x%p, pdulen %u.\n",
-				conn, c3cn, skb, skb_rx_pdulen(skb));
-		err = cxgb3i_conn_read_pdu_skb(conn, skb);
-		__kfree_skb(skb);
-		skb = skb_peek(&c3cn->receive_queue);
-	}
-	read_unlock(&c3cn->callback_lock);
-	c3cn->copied_seq += read;
-	cxgb3i_c3cn_rx_credits(c3cn, read);
-	conn->rxdata_octets += read;
-
-	if (err) {
-		cxgb3i_log_info("conn 0x%p rx failed err %d.\n", conn, err);
-		iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
-	}
-}
-
-void cxgb3i_conn_tx_open(struct s3_conn *c3cn)
-{
-	struct iscsi_conn *conn = c3cn->user_data;
-
-	cxgb3i_tx_debug("cn 0x%p.\n", c3cn);
-	if (conn) {
-		cxgb3i_tx_debug("cn 0x%p, cid %d.\n", c3cn, conn->id);
-		iscsi_conn_queue_work(conn);
-	}
-}
-
-void cxgb3i_conn_closing(struct s3_conn *c3cn)
-{
-	struct iscsi_conn *conn;
-
-	read_lock(&c3cn->callback_lock);
-	conn = c3cn->user_data;
-	if (conn && c3cn->state != C3CN_STATE_ESTABLISHED)
-		iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
-	read_unlock(&c3cn->callback_lock);
-}

drivers/scsi/cxgb3i/cxgb3i_pdu.h

···
-/*
- * cxgb3i_ulp2.h: Chelsio S3xx iSCSI driver.
- *
- * Copyright (c) 2008 Chelsio Communications, Inc.
- *
- * 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.
- *
- * Written by: Karen Xie ([e-mail])
- */
-
-#ifndef __CXGB3I_ULP2_PDU_H__
-#define __CXGB3I_ULP2_PDU_H__
-
-struct cpl_iscsi_hdr_norss {
-	union opcode_tid ot;
-	u16 pdu_len_ddp;
-	u16 len;
-	u32 seq;
-	u16 urg;
-	u8 rsvd;
-	u8 status;
-};
-
-struct cpl_rx_data_ddp_norss {
-	union opcode_tid ot;
-	u16 urg;
-	u16 len;
-	u32 seq;
-	u32 nxt_seq;
-	u32 ulp_crc;
-	u32 ddp_status;
-};
-
-#define RX_DDP_STATUS_IPP_SHIFT		27	/* invalid pagepod */
-#define RX_DDP_STATUS_TID_SHIFT		26	/* tid mismatch */
-#define RX_DDP_STATUS_COLOR_SHIFT	25	/* color mismatch */
-#define RX_DDP_STATUS_OFFSET_SHIFT	24	/* offset mismatch */
-#define RX_DDP_STATUS_ULIMIT_SHIFT	23	/* ulimit error */
-#define RX_DDP_STATUS_TAG_SHIFT		22	/* tag mismatch */
-#define RX_DDP_STATUS_DCRC_SHIFT	21	/* dcrc error */
-#define RX_DDP_STATUS_HCRC_SHIFT	20	/* hcrc error */
-#define RX_DDP_STATUS_PAD_SHIFT		19	/* pad error */
-#define RX_DDP_STATUS_PPP_SHIFT		18	/* pagepod parity error */
-#define RX_DDP_STATUS_LLIMIT_SHIFT	17	/* llimit error */
-#define RX_DDP_STATUS_DDP_SHIFT		16	/* ddp'able */
-#define RX_DDP_STATUS_PMM_SHIFT		15	/* pagepod mismatch */
-
-#define ULP2_FLAG_DATA_READY		0x1
-#define ULP2_FLAG_DATA_DDPED		0x2
-#define ULP2_FLAG_HCRC_ERROR		0x10
-#define ULP2_FLAG_DCRC_ERROR		0x20
-#define ULP2_FLAG_PAD_ERROR		0x40
-
-void cxgb3i_conn_closing(struct s3_conn *c3cn);
-void cxgb3i_conn_pdu_ready(struct s3_conn *c3cn);
-void cxgb3i_conn_tx_open(struct s3_conn *c3cn);
-#endif

drivers/scsi/cxgbi/Kconfig

···
+source "drivers/scsi/cxgbi/cxgb3i/Kconfig"
 source "drivers/scsi/cxgbi/cxgb4i/Kconfig"

drivers/scsi/cxgbi/Makefile

···
+obj-$(CONFIG_SCSI_CXGB3_ISCSI)	+= libcxgbi.o cxgb3i/
 obj-$(CONFIG_SCSI_CXGB4_ISCSI)	+= libcxgbi.o cxgb4i/

drivers/scsi/cxgbi/cxgb3i/cxgb3i.c

···
+/*
+ * cxgb3i_offload.c: Chelsio S3xx iscsi offloaded tcp connection management
+ *
+ * Copyright (C) 2003-2008 Chelsio Communications.  All rights reserved.
+ *
+ * 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 LICENSE file included in this
+ * release for licensing terms and conditions.
+ *
+ * Written by:	Dimitris Michailidis ([e-mail])
+ *		Karen Xie ([e-mail])
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
+
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <scsi/scsi_host.h>
+
+#include "common.h"
+#include "t3_cpl.h"
+#include "t3cdev.h"
+#include "cxgb3_defs.h"
+#include "cxgb3_ctl_defs.h"
+#include "cxgb3_offload.h"
+#include "firmware_exports.h"
+#include "cxgb3i.h"
+
+static unsigned int dbg_level;
+#include "../libcxgbi.h"
+
+#define DRV_MODULE_NAME         "cxgb3i"
+#define DRV_MODULE_DESC         "Chelsio T3 iSCSI Driver"
+#define DRV_MODULE_VERSION	"2.0.0"
+#define DRV_MODULE_RELDATE	"Jun. 2010"
+
+static char version[] =
+	DRV_MODULE_DESC " " DRV_MODULE_NAME
+	" v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
+
+MODULE_AUTHOR("Chelsio Communications, Inc.");
+MODULE_DESCRIPTION(DRV_MODULE_DESC);
+MODULE_VERSION(DRV_MODULE_VERSION);
+MODULE_LICENSE("GPL");
+
+module_param(dbg_level, uint, 0644);
+MODULE_PARM_DESC(dbg_level, "debug flag (default=0)");
+
+static int cxgb3i_rcv_win = 256 * 1024;
+module_param(cxgb3i_rcv_win, int, 0644);
+MODULE_PARM_DESC(cxgb3i_rcv_win, "TCP receive window in bytes (default=256KB)");
+
+static int cxgb3i_snd_win = 128 * 1024;
+module_param(cxgb3i_snd_win, int, 0644);
+MODULE_PARM_DESC(cxgb3i_snd_win, "TCP send window in bytes (default=128KB)");
+
+static int cxgb3i_rx_credit_thres = 10 * 1024;
+module_param(cxgb3i_rx_credit_thres, int, 0644);
+MODULE_PARM_DESC(rx_credit_thres,
+		 "RX credits return threshold in bytes (default=10KB)");
+
+static unsigned int cxgb3i_max_connect = 8 * 1024;
+module_param(cxgb3i_max_connect, uint, 0644);
+MODULE_PARM_DESC(cxgb3i_max_connect, "Max. # of connections (default=8092)");
+
+static unsigned int cxgb3i_sport_base = 20000;
+module_param(cxgb3i_sport_base, uint, 0644);
+MODULE_PARM_DESC(cxgb3i_sport_base, "starting port number (default=20000)");
+
+static void cxgb3i_dev_open(struct t3cdev *);
+static void cxgb3i_dev_close(struct t3cdev *);
+static void cxgb3i_dev_event_handler(struct t3cdev *, u32, u32);
+
+static struct cxgb3_client t3_client = {
+	.name = DRV_MODULE_NAME,
+	.handlers = cxgb3i_cpl_handlers,
+	.add = cxgb3i_dev_open,
+	.remove = cxgb3i_dev_close,
+	.event_handler = cxgb3i_dev_event_handler,
+};
+
+static struct scsi_host_template cxgb3i_host_template = {
+	.module		= THIS_MODULE,
+	.name		= DRV_MODULE_NAME,
+	.proc_name	= DRV_MODULE_NAME,
+	.can_queue	= CXGB3I_SCSI_HOST_QDEPTH,
+	.queuecommand	= iscsi_queuecommand,
+	.change_queue_depth = iscsi_change_queue_depth,
+	.sg_tablesize	= SG_ALL,
+	.max_sectors	= 0xFFFF,
+	.cmd_per_lun	= ISCSI_DEF_CMD_PER_LUN,
+	.eh_abort_handler = iscsi_eh_abort,
+	.eh_device_reset_handler = iscsi_eh_device_reset,
+	.eh_target_reset_handler = iscsi_eh_recover_target,
+	.target_alloc	= iscsi_target_alloc,
+	.use_clustering	= DISABLE_CLUSTERING,
+	.this_id	= -1,
+};
+
+static struct iscsi_transport cxgb3i_iscsi_transport = {
+	.owner		= THIS_MODULE,
+	.name		= DRV_MODULE_NAME,
+	/* owner and name should be set already */
+	.caps		= CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
+				| CAP_DATADGST | CAP_DIGEST_OFFLOAD |
+				CAP_PADDING_OFFLOAD,
+	.param_mask	= ISCSI_MAX_RECV_DLENGTH | ISCSI_MAX_XMIT_DLENGTH |
+				ISCSI_HDRDGST_EN | ISCSI_DATADGST_EN |
+				ISCSI_INITIAL_R2T_EN | ISCSI_MAX_R2T |
+				ISCSI_IMM_DATA_EN | ISCSI_FIRST_BURST |
+				ISCSI_MAX_BURST | ISCSI_PDU_INORDER_EN |
+				ISCSI_DATASEQ_INORDER_EN | ISCSI_ERL |
+				ISCSI_CONN_PORT | ISCSI_CONN_ADDRESS |
+				ISCSI_EXP_STATSN | ISCSI_PERSISTENT_PORT |
+				ISCSI_PERSISTENT_ADDRESS |
+				ISCSI_TARGET_NAME | ISCSI_TPGT |
+				ISCSI_USERNAME | ISCSI_PASSWORD |
+				ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
+				ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
+				ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
+				ISCSI_PING_TMO | ISCSI_RECV_TMO |
+				ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
+	.host_param_mask	= ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
+				ISCSI_HOST_INITIATOR_NAME |
+				ISCSI_HOST_NETDEV_NAME,
+	.get_host_param	= cxgbi_get_host_param,
+	.set_host_param	= cxgbi_set_host_param,
+	/* session management */
+	.create_session	= cxgbi_create_session,
+	.destroy_session	= cxgbi_destroy_session,
+	.get_session_param = iscsi_session_get_param,
+	/* connection management */
+	.create_conn	= cxgbi_create_conn,
+	.bind_conn	= cxgbi_bind_conn,
+	.destroy_conn	= iscsi_tcp_conn_teardown,
+	.start_conn	= iscsi_conn_start,
+	.stop_conn	= iscsi_conn_stop,
+	.get_conn_param	= cxgbi_get_conn_param,
+	.set_param	= cxgbi_set_conn_param,
+	.get_stats	= cxgbi_get_conn_stats,
+	/* pdu xmit req from user space */
+	.send_pdu	= iscsi_conn_send_pdu,
+	/* task */
+	.init_task	= iscsi_tcp_task_init,
+	.xmit_task	= iscsi_tcp_task_xmit,
+	.cleanup_task	= cxgbi_cleanup_task,
+	/* pdu */
+	.alloc_pdu	= cxgbi_conn_alloc_pdu,
+	.init_pdu	= cxgbi_conn_init_pdu,
+	.xmit_pdu	= cxgbi_conn_xmit_pdu,
+	.parse_pdu_itt	= cxgbi_parse_pdu_itt,
+	/* TCP connect/disconnect */
+	.ep_connect	= cxgbi_ep_connect,
+	.ep_poll	= cxgbi_ep_poll,
+	.ep_disconnect	= cxgbi_ep_disconnect,
+	/* Error recovery timeout call */
+	.session_recovery_timedout = iscsi_session_recovery_timedout,
+};
+
+static struct scsi_transport_template *cxgb3i_stt;
+
+/*
+ * CPL (Chelsio Protocol Language) defines a message passing interface between
+ * the host driver and Chelsio asic.
+ * The section below implments CPLs that related to iscsi tcp connection
+ * open/close/abort and data send/receive.
+ */
+
+static int push_tx_frames(struct cxgbi_sock *csk, int req_completion);
+
+static void send_act_open_req(struct cxgbi_sock *csk, struct sk_buff *skb,
+			      const struct l2t_entry *e)
+{
+	unsigned int wscale = cxgbi_sock_compute_wscale(cxgb3i_rcv_win);
+	struct cpl_act_open_req *req = (struct cpl_act_open_req *)skb->head;
+
+	skb->priority = CPL_PRIORITY_SETUP;
+
+	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
+	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ACT_OPEN_REQ, csk->atid));
+	req->local_port = csk->saddr.sin_port;
+	req->peer_port = csk->daddr.sin_port;
+	req->local_ip = csk->saddr.sin_addr.s_addr;
+	req->peer_ip = csk->daddr.sin_addr.s_addr;
+
+	req->opt0h = htonl(V_KEEP_ALIVE(1) | F_TCAM_BYPASS |
+			V_WND_SCALE(wscale) | V_MSS_IDX(csk->mss_idx) |
+			V_L2T_IDX(e->idx) | V_TX_CHANNEL(e->smt_idx));
+	req->opt0l = htonl(V_ULP_MODE(ULP2_MODE_ISCSI) |
+			V_RCV_BUFSIZ(cxgb3i_rcv_win>>10));
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx,%u, %pI4:%u-%pI4:%u, %u,%u,%u.\n",
+		csk, csk->state, csk->flags, csk->atid,
+		&req->local_ip, ntohs(req->local_port),
+		&req->peer_ip, ntohs(req->peer_port),
+		csk->mss_idx, e->idx, e->smt_idx);
+
+	l2t_send(csk->cdev->lldev, skb, csk->l2t);
+}
+
+static inline void act_open_arp_failure(struct t3cdev *dev, struct sk_buff *skb)
+{
+	cxgbi_sock_act_open_req_arp_failure(NULL, skb);
+}
+
+/*
+ * CPL connection close request: host ->
+ *
+ * Close a connection by sending a CPL_CLOSE_CON_REQ message and queue it to
+ * the write queue (i.e., after any unsent txt data).
+ */
+static void send_close_req(struct cxgbi_sock *csk)
+{
+	struct sk_buff *skb = csk->cpl_close;
+	struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
+	unsigned int tid = csk->tid;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx,%u.\n",
+		csk, csk->state, csk->flags, csk->tid);
+
+	csk->cpl_close = NULL;
+	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_CLOSE_CON));
+	req->wr.wr_lo = htonl(V_WR_TID(tid));
+	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
+	req->rsvd = htonl(csk->write_seq);
+
+	cxgbi_sock_skb_entail(csk, skb);
+	if (csk->state >= CTP_ESTABLISHED)
+		push_tx_frames(csk, 1);
+}
+
+/*
+ * CPL connection abort request: host ->
+ *
+ * Send an ABORT_REQ message. Makes sure we do not send multiple ABORT_REQs
+ * for the same connection and also that we do not try to send a message
+ * after the connection has closed.
+ */
+static void abort_arp_failure(struct t3cdev *tdev, struct sk_buff *skb)
+{
+	struct cpl_abort_req *req = cplhdr(skb);
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"t3dev 0x%p, tid %u, skb 0x%p.\n",
+		tdev, GET_TID(req), skb);
+	req->cmd = CPL_ABORT_NO_RST;
+	cxgb3_ofld_send(tdev, skb);
+}
+
+static void send_abort_req(struct cxgbi_sock *csk)
+{
+	struct sk_buff *skb = csk->cpl_abort_req;
+	struct cpl_abort_req *req;
+
+	if (unlikely(csk->state == CTP_ABORTING || !skb))
+		return;
+	cxgbi_sock_set_state(csk, CTP_ABORTING);
+	cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_PENDING);
+	/* Purge the send queue so we don't send anything after an abort. */
+	cxgbi_sock_purge_write_queue(csk);
+
+	csk->cpl_abort_req = NULL;
+	req = (struct cpl_abort_req *)skb->head;
+	skb->priority = CPL_PRIORITY_DATA;
+	set_arp_failure_handler(skb, abort_arp_failure);
+	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_REQ));
+	req->wr.wr_lo = htonl(V_WR_TID(csk->tid));
+	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ABORT_REQ, csk->tid));
+	req->rsvd0 = htonl(csk->snd_nxt);
+	req->rsvd1 = !cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT);
+	req->cmd = CPL_ABORT_SEND_RST;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx,%u, snd_nxt %u, 0x%x.\n",
+		csk, csk->state, csk->flags, csk->tid, csk->snd_nxt,
+		req->rsvd1);
+
+	l2t_send(csk->cdev->lldev, skb, csk->l2t);
+}
+
+/*
+ * CPL connection abort reply: host ->
+ *
+ * Send an ABORT_RPL message in response of the ABORT_REQ received.
+ */
+static void send_abort_rpl(struct cxgbi_sock *csk, int rst_status)
+{
+	struct sk_buff *skb = csk->cpl_abort_rpl;
+	struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx,%u, status %d.\n",
+		csk, csk->state, csk->flags, csk->tid, rst_status);
+
+	csk->cpl_abort_rpl = NULL;
+	skb->priority = CPL_PRIORITY_DATA;
+	rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
+	rpl->wr.wr_lo = htonl(V_WR_TID(csk->tid));
+	OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, csk->tid));
+	rpl->cmd = rst_status;
+	cxgb3_ofld_send(csk->cdev->lldev, skb);
+}
+
+/*
+ * CPL connection rx data ack: host ->
+ * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
+ * credits sent.
+ */
+static u32 send_rx_credits(struct cxgbi_sock *csk, u32 credits)
+{
+	struct sk_buff *skb;
+	struct cpl_rx_data_ack *req;
+	u32 dack = F_RX_DACK_CHANGE | V_RX_DACK_MODE(1);
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
+		"csk 0x%p,%u,0x%lx,%u, credit %u, dack %u.\n",
+		csk, csk->state, csk->flags, csk->tid, credits, dack);
+
+	skb = alloc_cpl(sizeof(*req), 0, GFP_ATOMIC);
+	if (!skb) {
+		pr_info("csk 0x%p, credit %u, OOM.\n", csk, credits);
+		return 0;
+	}
+	req = (struct cpl_rx_data_ack *)skb->head;
+	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
+	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_RX_DATA_ACK, csk->tid));
+	req->credit_dack = htonl(F_RX_DACK_CHANGE | V_RX_DACK_MODE(1) |
+				V_RX_CREDITS(credits));
+	skb->priority = CPL_PRIORITY_ACK;
+	cxgb3_ofld_send(csk->cdev->lldev, skb);
+	return credits;
+}
+
+/*
+ * CPL connection tx data: host ->
+ *
+ * Send iscsi PDU via TX_DATA CPL message. Returns the number of
+ * credits sent.
+ * Each TX_DATA consumes work request credit (wrs), so we need to keep track of
+ * how many we've used so far and how many are pending (i.e., yet ack'ed by T3).
+ */
+
+static unsigned int wrlen __read_mostly;
+static unsigned int skb_wrs[SKB_WR_LIST_SIZE] __read_mostly;
+
+static void init_wr_tab(unsigned int wr_len)
+{
+	int i;
+
+	if (skb_wrs[1])		/* already initialized */
+		return;
+	for (i = 1; i < SKB_WR_LIST_SIZE; i++) {
+		int sgl_len = (3 * i) / 2 + (i & 1);
+
+		sgl_len += 3;
+		skb_wrs[i] = (sgl_len <= wr_len
+			      ? 1 : 1 + (sgl_len - 2) / (wr_len - 1));
+	}
+	wrlen = wr_len * 8;
+}
+
+static inline void make_tx_data_wr(struct cxgbi_sock *csk, struct sk_buff *skb,
+				   int len, int req_completion)
+{
+	struct tx_data_wr *req;
+	struct l2t_entry *l2t = csk->l2t;
+
+	skb_reset_transport_header(skb);
+	req = (struct tx_data_wr *)__skb_push(skb, sizeof(*req));
+	req->wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA) |
+			(req_completion ? F_WR_COMPL : 0));
+	req->wr_lo = htonl(V_WR_TID(csk->tid));
+	/* len includes the length of any HW ULP additions */
+	req->len = htonl(len);
+	/* V_TX_ULP_SUBMODE sets both the mode and submode */
+	req->flags = htonl(V_TX_ULP_SUBMODE(cxgbi_skcb_ulp_mode(skb)) |
+			   V_TX_SHOVE((skb_peek(&csk->write_queue) ? 0 : 1)));
+	req->sndseq = htonl(csk->snd_nxt);
+	req->param = htonl(V_TX_PORT(l2t->smt_idx));
+
+	if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
+		req->flags |= htonl(V_TX_ACK_PAGES(2) | F_TX_INIT |
+				    V_TX_CPU_IDX(csk->rss_qid));
+		/* sendbuffer is in units of 32KB. */
+		req->param |= htonl(V_TX_SNDBUF(cxgb3i_snd_win >> 15));
+		cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
+	}
+}
+
+/**
+ * push_tx_frames -- start transmit
+ * @c3cn: the offloaded connection
+ * @req_completion: request wr_ack or not
+ *
+ * Prepends TX_DATA_WR or CPL_CLOSE_CON_REQ headers to buffers waiting in a
+ * connection's send queue and sends them on to T3.  Must be called with the
+ * connection's lock held.  Returns the amount of send buffer space that was
+ * freed as a result of sending queued data to T3.
+ */
+
+static void arp_failure_skb_discard(struct t3cdev *dev, struct sk_buff *skb)
+{
+	kfree_skb(skb);
+}
+
+static int push_tx_frames(struct cxgbi_sock *csk, int req_completion)
+{
+	int total_size = 0;
+	struct sk_buff *skb;
+
+	if (unlikely(csk->state < CTP_ESTABLISHED ||
+		csk->state == CTP_CLOSE_WAIT_1 || csk->state >= CTP_ABORTING)) {
+			log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
+				"csk 0x%p,%u,0x%lx,%u, in closing state.\n",
+				csk, csk->state, csk->flags, csk->tid);
+		return 0;
+	}
+
+	while (csk->wr_cred && (skb = skb_peek(&csk->write_queue)) != NULL) {
+		int len = skb->len;	/* length before skb_push */
+		int frags = skb_shinfo(skb)->nr_frags + (len != skb->data_len);
+		int wrs_needed = skb_wrs[frags];
+
+		if (wrs_needed > 1 && len + sizeof(struct tx_data_wr) <= wrlen)
+			wrs_needed = 1;
+
+		WARN_ON(frags >= SKB_WR_LIST_SIZE || wrs_needed < 1);
+
+		if (csk->wr_cred < wrs_needed) {
+			log_debug(1 << CXGBI_DBG_PDU_TX,
+				"csk 0x%p, skb len %u/%u, frag %u, wr %d<%u.\n",
+				csk, skb->len, skb->data_len, frags,
+				wrs_needed, csk->wr_cred);
+			break;
+		}
+
+		__skb_unlink(skb, &csk->write_queue);
+		skb->priority = CPL_PRIORITY_DATA;
+		skb->csum = wrs_needed;	/* remember this until the WR_ACK */
+		csk->wr_cred -= wrs_needed;
+		csk->wr_una_cred += wrs_needed;
+		cxgbi_sock_enqueue_wr(csk, skb);
+
+		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
+			"csk 0x%p, enqueue, skb len %u/%u, frag %u, wr %d, "
+			"left %u, unack %u.\n",
+			csk, skb->len, skb->data_len, frags, skb->csum,
+			csk->wr_cred, csk->wr_una_cred);
+
+		if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR))) {
+			if ((req_completion &&
+				csk->wr_una_cred == wrs_needed) ||
+			     csk->wr_una_cred >= csk->wr_max_cred / 2) {
+				req_completion = 1;
+				csk->wr_una_cred = 0;
+			}
+			len += cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
+			make_tx_data_wr(csk, skb, len, req_completion);
+			csk->snd_nxt += len;
+			cxgbi_skcb_clear_flag(skb, SKCBF_TX_NEED_HDR);
+		}
+		total_size += skb->truesize;
+		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
+			"csk 0x%p, tid 0x%x, send skb 0x%p.\n",
+			csk, csk->tid, skb);
+		set_arp_failure_handler(skb, arp_failure_skb_discard);
+		l2t_send(csk->cdev->lldev, skb, csk->l2t);
+	}
+	return total_size;
+}
+
+/*
+ * Process a CPL_ACT_ESTABLISH message: -> host
+ * Updates connection state from an active establish CPL message.  Runs with
+ * the connection lock held.
+ */
+
+static inline void free_atid(struct cxgbi_sock *csk)
+{
+	if (cxgbi_sock_flag(csk, CTPF_HAS_ATID)) {
+		cxgb3_free_atid(csk->cdev->lldev, csk->atid);
+		cxgbi_sock_clear_flag(csk, CTPF_HAS_ATID);
+		cxgbi_sock_put(csk);
+	}
+}
+
+static int do_act_establish(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
+{
+	struct cxgbi_sock *csk = ctx;
+	struct cpl_act_establish *req = cplhdr(skb);
+	unsigned int tid = GET_TID(req);
+	unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
+	u32 rcv_isn = ntohl(req->rcv_isn);	/* real RCV_ISN + 1 */
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"atid 0x%x,tid 0x%x, csk 0x%p,%u,0x%lx, isn %u.\n",
+		atid, atid, csk, csk->state, csk->flags, rcv_isn);
+
+	cxgbi_sock_get(csk);
+	cxgbi_sock_set_flag(csk, CTPF_HAS_TID);
+	csk->tid = tid;
+	cxgb3_insert_tid(csk->cdev->lldev, &t3_client, csk, tid);
+
+	free_atid(csk);
+
+	csk->rss_qid = G_QNUM(ntohs(skb->csum));
+
+	spin_lock_bh(&csk->lock);
+	if (csk->retry_timer.function) {
+		del_timer(&csk->retry_timer);
+		csk->retry_timer.function = NULL;
+	}
+
+	if (unlikely(csk->state != CTP_ACTIVE_OPEN))
+		pr_info("csk 0x%p,%u,0x%lx,%u, got EST.\n",
+			csk, csk->state, csk->flags, csk->tid);
+
+	csk->copied_seq = csk->rcv_wup = csk->rcv_nxt = rcv_isn;
+	if (cxgb3i_rcv_win > (M_RCV_BUFSIZ << 10))
+		csk->rcv_wup -= cxgb3i_rcv_win - (M_RCV_BUFSIZ << 10);
+
+	cxgbi_sock_established(csk, ntohl(req->snd_isn), ntohs(req->tcp_opt));
+
+	if (unlikely(cxgbi_sock_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED)))
+		/* upper layer has requested closing */
+		send_abort_req(csk);
+	else {
+		if (skb_queue_len(&csk->write_queue))
+			push_tx_frames(csk, 1);
+		cxgbi_conn_tx_open(csk);
+	}
+
+	spin_unlock_bh(&csk->lock);
+	__kfree_skb(skb);
+	return 0;
+}
+
+/*
+ * Process a CPL_ACT_OPEN_RPL message: -> host
+ * Handle active open failures.
+ */
+static int act_open_rpl_status_to_errno(int status)
+{
+	switch (status) {
+	case CPL_ERR_CONN_RESET:
+		return -ECONNREFUSED;
+	case CPL_ERR_ARP_MISS:
+		return -EHOSTUNREACH;
+	case CPL_ERR_CONN_TIMEDOUT:
+		return -ETIMEDOUT;
+	case CPL_ERR_TCAM_FULL:
+		return -ENOMEM;
+	case CPL_ERR_CONN_EXIST:
+		return -EADDRINUSE;
+	default:
+		return -EIO;
+	}
+}
+
+static void act_open_retry_timer(unsigned long data)
+{
+	struct sk_buff *skb;
+	struct cxgbi_sock *csk = (struct cxgbi_sock *)data;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx,%u.\n",
+		csk, csk->state, csk->flags, csk->tid);
+
+	cxgbi_sock_get(csk);
+	spin_lock_bh(&csk->lock);
+	skb = alloc_cpl(sizeof(struct cpl_act_open_req), 0, GFP_ATOMIC);
+	if (!skb)
+		cxgbi_sock_fail_act_open(csk, -ENOMEM);
+	else {
+		skb->sk = (struct sock *)csk;
+		set_arp_failure_handler(skb, act_open_arp_failure);
+		send_act_open_req(csk, skb, csk->l2t);
+	}
+	spin_unlock_bh(&csk->lock);
+	cxgbi_sock_put(csk);
+}
+
+static int do_act_open_rpl(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
+{
+	struct cxgbi_sock *csk = ctx;
+	struct cpl_act_open_rpl *rpl = cplhdr(skb);
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx,%u, status %u.\n",
+		csk, csk->state, csk->flags, csk->atid, rpl->status);
+
+	if (rpl->status != CPL_ERR_TCAM_FULL &&
+	    rpl->status != CPL_ERR_CONN_EXIST &&
+	    rpl->status != CPL_ERR_ARP_MISS)
+		cxgb3_queue_tid_release(tdev, GET_TID(rpl));
+
+	cxgbi_sock_get(csk);
+	spin_lock_bh(&csk->lock);
+	if (rpl->status == CPL_ERR_CONN_EXIST &&
+	    csk->retry_timer.function != act_open_retry_timer) {
+		csk->retry_timer.function = act_open_retry_timer;
+		mod_timer(&csk->retry_timer, jiffies + HZ / 2);
+	} else
+		cxgbi_sock_fail_act_open(csk,
+				act_open_rpl_status_to_errno(rpl->status));
+
+	spin_unlock_bh(&csk->lock);
+	cxgbi_sock_put(csk);
+	__kfree_skb(skb);
+	return 0;
+}
+
+/*
+ * Process PEER_CLOSE CPL messages: -> host
+ * Handle peer FIN.
+ */
+static int do_peer_close(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
+{
+	struct cxgbi_sock *csk = ctx;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx,%u.\n",
+		csk, csk->state, csk->flags, csk->tid);
+
+	cxgbi_sock_rcv_peer_close(csk);
+	__kfree_skb(skb);
+	return 0;
+}
+
+/*
+ * Process CLOSE_CONN_RPL CPL message: -> host
+ * Process a peer ACK to our FIN.
+ */
+static int do_close_con_rpl(struct t3cdev *cdev, struct sk_buff *skb,
+			    void *ctx)
+{
+	struct cxgbi_sock *csk = ctx;
+	struct cpl_close_con_rpl *rpl = cplhdr(skb);
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx,%u, snxt %u.\n",
+		csk, csk->state, csk->flags, csk->tid, ntohl(rpl->snd_nxt));
+
+	cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
+	__kfree_skb(skb);
+	return 0;
+}
+
+/*
+ * Process ABORT_REQ_RSS CPL message: -> host
+ * Process abort requests.  If we are waiting for an ABORT_RPL we ignore this
+ * request except that we need to reply to it.
+ */
+
+static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
+				 int *need_rst)
+{
+	switch (abort_reason) {
+	case CPL_ERR_BAD_SYN: /* fall through */
+	case CPL_ERR_CONN_RESET:
+		return csk->state > CTP_ESTABLISHED ?
+			-EPIPE : -ECONNRESET;
+	case CPL_ERR_XMIT_TIMEDOUT:
+	case CPL_ERR_PERSIST_TIMEDOUT:
+	case CPL_ERR_FINWAIT2_TIMEDOUT:
+	case CPL_ERR_KEEPALIVE_TIMEDOUT:
+		return -ETIMEDOUT;
+	default:
+		return -EIO;
+	}
+}
+
+static int do_abort_req(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
+{
+	const struct cpl_abort_req_rss *req = cplhdr(skb);
+	struct cxgbi_sock *csk = ctx;
+	int rst_status = CPL_ABORT_NO_RST;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx,%u.\n",
+		csk, csk->state, csk->flags, csk->tid);
+
+	if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
+	    req->status == CPL_ERR_PERSIST_NEG_ADVICE) {
+		goto done;
+	}
+
+	cxgbi_sock_get(csk);
+	spin_lock_bh(&csk->lock);
+
+	if (!cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD)) {
+		cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
+		cxgbi_sock_set_state(csk, CTP_ABORTING);
+		goto out;
+	}
+
+	cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);
+	send_abort_rpl(csk, rst_status);
+
+	if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
+		csk->err = abort_status_to_errno(csk, req->status, &rst_status);
+		cxgbi_sock_closed(csk);
+	}
+
+out:
+	spin_unlock_bh(&csk->lock);
+	cxgbi_sock_put(csk);
+done:
+	__kfree_skb(skb);
+	return 0;
+}
+
+/*
+ * Process ABORT_RPL_RSS CPL message: -> host
+ * Process abort replies.  We only process these messages if we anticipate
+ * them as the coordination between SW and HW in this area is somewhat lacking
+ * and sometimes we get ABORT_RPLs after we are done with the connection that
+ * originated the ABORT_REQ.
+ */
+static int do_abort_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
+{
+	struct cpl_abort_rpl_rss *rpl = cplhdr(skb);
+	struct cxgbi_sock *csk = ctx;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"status 0x%x, csk 0x%p, s %u, 0x%lx.\n",
+		rpl->status, csk, csk ? csk->state : 0,
+		csk ? csk->flags : 0UL);
+	/*
+	 * Ignore replies to post-close aborts indicating that the abort was
+	 * requested too late.  These connections are terminated when we get
+	 * PEER_CLOSE or CLOSE_CON_RPL and by the time the abort_rpl_rss
+	 * arrives the TID is either no longer used or it has been recycled.
+	 */
+	if (rpl->status == CPL_ERR_ABORT_FAILED)
+		goto rel_skb;
+	/*
+	 * Sometimes we've already closed the connection, e.g., a post-close
+	 * abort races with ABORT_REQ_RSS, the latter frees the connection
+	 * expecting the ABORT_REQ will fail with CPL_ERR_ABORT_FAILED,
+	 * but FW turns the ABORT_REQ into a regular one and so we get
+	 * ABORT_RPL_RSS with status 0 and no connection.
+	 */
+	if (csk)
+		cxgbi_sock_rcv_abort_rpl(csk);
+rel_skb:
+	__kfree_skb(skb);
+	return 0;
+}
+
+/*
+ * Process RX_ISCSI_HDR CPL message: -> host
+ * Handle received PDUs, the payload could be DDP'ed. If not, the payload
+ * follow after the bhs.
+ */
+static int do_iscsi_hdr(struct t3cdev *t3dev, struct sk_buff *skb, void *ctx)
+{
+	struct cxgbi_sock *csk = ctx;
+	struct cpl_iscsi_hdr *hdr_cpl = cplhdr(skb);
+	struct cpl_iscsi_hdr_norss data_cpl;
+	struct cpl_rx_data_ddp_norss ddp_cpl;
+	unsigned int hdr_len, data_len, status;
+	unsigned int len;
+	int err;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
+		"csk 0x%p,%u,0x%lx,%u, skb 0x%p,%u.\n",
+		csk, csk->state, csk->flags, csk->tid, skb, skb->len);
+
+	spin_lock_bh(&csk->lock);
+
+	if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
+		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+			"csk 0x%p,%u,0x%lx,%u, bad state.\n",
+			csk, csk->state, csk->flags, csk->tid);
+		if (csk->state != CTP_ABORTING)
+			goto abort_conn;
+		else
+			goto discard;
+	}
+
+	cxgbi_skcb_tcp_seq(skb) = ntohl(hdr_cpl->seq);
+	cxgbi_skcb_flags(skb) = 0;
+
+	skb_reset_transport_header(skb);
+	__skb_pull(skb, sizeof(struct cpl_iscsi_hdr));
+
+	len = hdr_len = ntohs(hdr_cpl->len);
+	/* msg coalesce is off or not enough data received */
+	if (skb->len <= hdr_len) {
+		pr_err("%s: tid %u, CPL_ISCSI_HDR, skb len %u < %u.\n",
+			csk->cdev->ports[csk->port_id]->name, csk->tid,
+			skb->len, hdr_len);
+		goto abort_conn;
+	}
+	cxgbi_skcb_set_flag(skb, SKCBF_RX_COALESCED);
+
+	err = skb_copy_bits(skb, skb->len - sizeof(ddp_cpl), &ddp_cpl,
+			    sizeof(ddp_cpl));
+	if (err < 0) {
+		pr_err("%s: tid %u, copy cpl_ddp %u-%zu failed %d.\n",
+			csk->cdev->ports[csk->port_id]->name, csk->tid,
+			skb->len, sizeof(ddp_cpl), err);
+		goto abort_conn;
+	}
+
+	cxgbi_skcb_set_flag(skb, SKCBF_RX_STATUS);
+	cxgbi_skcb_rx_pdulen(skb) = ntohs(ddp_cpl.len);
+	cxgbi_skcb_rx_ddigest(skb) = ntohl(ddp_cpl.ulp_crc);
+	status = ntohl(ddp_cpl.ddp_status);
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
+		"csk 0x%p, skb 0x%p,%u, pdulen %u, status 0x%x.\n",
+		csk, skb, skb->len, cxgbi_skcb_rx_pdulen(skb), status);
+
+	if (status & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT))
+		cxgbi_skcb_set_flag(skb, SKCBF_RX_HCRC_ERR);
+	if (status & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT))
+		cxgbi_skcb_set_flag(skb, SKCBF_RX_DCRC_ERR);
+	if (status & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT))
+		cxgbi_skcb_set_flag(skb, SKCBF_RX_PAD_ERR);
+
+	if (skb->len > (hdr_len + sizeof(ddp_cpl))) {
+		err = skb_copy_bits(skb, hdr_len, &data_cpl, sizeof(data_cpl));
+		if (err < 0) {
+			pr_err("%s: tid %u, cp %zu/%u failed %d.\n",
+				csk->cdev->ports[csk->port_id]->name,
+				csk->tid, sizeof(data_cpl), skb->len, err);
+			goto abort_conn;
+		}
+		data_len = ntohs(data_cpl.len);
+		log_debug(1 << CXGBI_DBG_DDP | 1 << CXGBI_DBG_PDU_RX,
+			"skb 0x%p, pdu not ddp'ed %u/%u, status 0x%x.\n",
+			skb, data_len, cxgbi_skcb_rx_pdulen(skb), status);
+		len += sizeof(data_cpl) + data_len;
+	} else if (status & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT))
+		cxgbi_skcb_set_flag(skb, SKCBF_RX_DATA_DDPD);
+
+	csk->rcv_nxt = ntohl(ddp_cpl.seq) + cxgbi_skcb_rx_pdulen(skb);
+	__pskb_trim(skb, len);
+	__skb_queue_tail(&csk->receive_queue, skb);
+	cxgbi_conn_pdu_ready(csk);
+
+	spin_unlock_bh(&csk->lock);
+	return 0;
+
+abort_conn:
+	send_abort_req(csk);
+discard:
+	spin_unlock_bh(&csk->lock);
+	__kfree_skb(skb);
+	return 0;
+}
+
+/*
+ * Process TX_DATA_ACK CPL messages: -> host
+ * Process an acknowledgment of WR completion.  Advance snd_una and send the
+ * next batch of work requests from the write queue.
+ */
+static int do_wr_ack(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
+{
+	struct cxgbi_sock *csk = ctx;
+	struct cpl_wr_ack *hdr = cplhdr(skb);
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
+		"csk 0x%p,%u,0x%lx,%u, cr %u.\n",
+		csk, csk->state, csk->flags, csk->tid, ntohs(hdr->credits));
+
+	cxgbi_sock_rcv_wr_ack(csk, ntohs(hdr->credits), ntohl(hdr->snd_una), 1);
+	__kfree_skb(skb);
+	return 0;
+}
+
+/*
+ * for each connection, pre-allocate skbs needed for close/abort requests. So
+ * that we can service the request right away.
+ */
+static int alloc_cpls(struct cxgbi_sock *csk)
+{
+	csk->cpl_close = alloc_cpl(sizeof(struct cpl_close_con_req), 0,
+					GFP_KERNEL);
+	if (!csk->cpl_close)
+		return -ENOMEM;
+	csk->cpl_abort_req = alloc_cpl(sizeof(struct cpl_abort_req), 0,
+					GFP_KERNEL);
+	if (!csk->cpl_abort_req)
+		goto free_cpl_skbs;
+
+	csk->cpl_abort_rpl = alloc_cpl(sizeof(struct cpl_abort_rpl), 0,
+					GFP_KERNEL);
+	if (!csk->cpl_abort_rpl)
+		goto free_cpl_skbs;
+
+	return 0;
+
+free_cpl_skbs:
+	cxgbi_sock_free_cpl_skbs(csk);
+	return -ENOMEM;
+}
+
+/**
+ * release_offload_resources - release offload resource
+ * @c3cn: the offloaded iscsi tcp connection.
+ * Release resources held by an offload connection (TID, L2T entry, etc.)
+ */
+static void l2t_put(struct cxgbi_sock *csk)
+{
+	struct t3cdev *t3dev = (struct t3cdev *)csk->cdev->lldev;
+
+	if (csk->l2t) {
+		l2t_release(L2DATA(t3dev), csk->l2t);
+		csk->l2t = NULL;
+		cxgbi_sock_put(csk);
+	}
+}
+
+static void release_offload_resources(struct cxgbi_sock *csk)
+{
+	struct t3cdev *t3dev = (struct t3cdev *)csk->cdev->lldev;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx,%u.\n",
+		csk, csk->state, csk->flags, csk->tid);
+
+	csk->rss_qid = 0;
+	cxgbi_sock_free_cpl_skbs(csk);
+
+	if (csk->wr_cred != csk->wr_max_cred) {
+		cxgbi_sock_purge_wr_queue(csk);
+		cxgbi_sock_reset_wr_list(csk);
+	}
+	l2t_put(csk);
+	if (cxgbi_sock_flag(csk, CTPF_HAS_ATID))
+		free_atid(csk);
+	else if (cxgbi_sock_flag(csk, CTPF_HAS_TID)) {
+		cxgb3_remove_tid(t3dev, (void *)csk, csk->tid);
+		cxgbi_sock_clear_flag(csk, CTPF_HAS_TID);
+		cxgbi_sock_put(csk);
+	}
+	csk->dst = NULL;
+	csk->cdev = NULL;
+}
+
+static int init_act_open(struct cxgbi_sock *csk)
+{
+	struct dst_entry *dst = csk->dst;
+	struct cxgbi_device *cdev = csk->cdev;
+	struct t3cdev *t3dev = (struct t3cdev *)cdev->lldev;
+	struct net_device *ndev = cdev->ports[csk->port_id];
+	struct sk_buff *skb = NULL;
+
+	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx.\n", csk, csk->state, csk->flags);
+
+	csk->rss_qid = 0;
+	csk->l2t = t3_l2t_get(t3dev, dst->neighbour, ndev);
+	if (!csk->l2t) {
+		pr_err("NO l2t available.\n");
+		return -EINVAL;
+	}
+	cxgbi_sock_get(csk);
+
+	csk->atid = cxgb3_alloc_atid(t3dev, &t3_client, csk);
+	if (csk->atid < 0) {
+		pr_err("NO atid available.\n");
+		goto rel_resource;
+	}
+	cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
+	cxgbi_sock_get(csk);
+
+	skb = alloc_cpl(sizeof(struct cpl_act_open_req), 0, GFP_KERNEL);
+	if (!skb)
+		goto rel_resource;
+	skb->sk = (struct sock *)csk;
+	set_arp_failure_handler(skb, act_open_arp_failure);
+
+	csk->wr_max_cred = csk->wr_cred = T3C_DATA(t3dev)->max_wrs - 1;
+	csk->wr_una_cred = 0;
+	csk->mss_idx = cxgbi_sock_select_mss(csk, dst_mtu(dst));
+	cxgbi_sock_reset_wr_list(csk);
+	csk->err = 0;
+
+	cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
+	send_act_open_req(csk, skb, csk->l2t);
+	return 0;
+
+rel_resource:
+	if (skb)
+		__kfree_skb(skb);
+	return -EINVAL;
+}
+
+cxgb3_cpl_handler_func cxgb3i_cpl_handlers[NUM_CPL_CMDS] = {
+	[CPL_ACT_ESTABLISH] = do_act_establish,
+	[CPL_ACT_OPEN_RPL] = do_act_open_rpl,
+	[CPL_PEER_CLOSE] = do_peer_close,
+	[CPL_ABORT_REQ_RSS] = do_abort_req,
+	[CPL_ABORT_RPL_RSS] = do_abort_rpl,
+	[CPL_CLOSE_CON_RPL] = do_close_con_rpl,
+	[CPL_TX_DMA_ACK] = do_wr_ack,
+	[CPL_ISCSI_HDR] = do_iscsi_hdr,
+};
+
+/**
+ * cxgb3i_ofld_init - allocate and initialize resources for each adapter found
+ * @cdev:	cxgbi adapter
+ */
+int cxgb3i_ofld_init(struct cxgbi_device *cdev)
+{
+	struct t3cdev *t3dev = (struct t3cdev *)cdev->lldev;
+	struct adap_ports port;
+	struct ofld_page_info rx_page_info;
+	unsigned int wr_len;
+	int rc;
+
+	if (t3dev->ctl(t3dev, GET_WR_LEN, &wr_len) < 0 ||
+	    t3dev->ctl(t3dev, GET_PORTS, &port) < 0 ||
+	    t3dev->ctl(t3dev, GET_RX_PAGE_INFO, &rx_page_info) < 0) {
+		pr_warn("t3 0x%p, offload up, ioctl failed.\n", t3dev);
+		return -EINVAL;
+	}
+
+	if (cxgb3i_max_connect > CXGBI_MAX_CONN)
+		cxgb3i_max_connect = CXGBI_MAX_CONN;
+
+	rc = cxgbi_device_portmap_create(cdev, cxgb3i_sport_base,
+					cxgb3i_max_connect);
+	if (rc < 0)
+		return rc;
+
+	init_wr_tab(wr_len);
+	cdev->csk_release_offload_resources = release_offload_resources;
+	cdev->csk_push_tx_frames = push_tx_frames;
+	cdev->csk_send_abort_req = send_abort_req;
+	cdev->csk_send_close_req = send_close_req;
+	cdev->csk_send_rx_credits = send_rx_credits;
+	cdev->csk_alloc_cpls = alloc_cpls;
+	cdev->csk_init_act_open = init_act_open;
+
+	pr_info("cdev 0x%p, offload up, added.\n", cdev);
+	return 0;
+}
+
+/*
+ * functions to program the pagepod in h/w
+ */
+static inline void ulp_mem_io_set_hdr(struct sk_buff *skb, unsigned int addr)
+{
+	struct ulp_mem_io *req = (struct ulp_mem_io *)skb->head;
+
+	memset(req, 0, sizeof(*req));
+
+	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_BYPASS));
+	req->cmd_lock_addr = htonl(V_ULP_MEMIO_ADDR(addr >> 5) |
+				   V_ULPTX_CMD(ULP_MEM_WRITE));
+	req->len = htonl(V_ULP_MEMIO_DATA_LEN(PPOD_SIZE >> 5) |
+			 V_ULPTX_NFLITS((PPOD_SIZE >> 3) + 1));
+}
+
+static int ddp_set_map(struct cxgbi_sock *csk, struct cxgbi_pagepod_hdr *hdr,
+			unsigned int idx, unsigned int npods,
+				struct cxgbi_gather_list *gl)
+{
+	struct cxgbi_device *cdev = csk->cdev;
+	struct cxgbi_ddp_info *ddp = cdev->ddp;
+	unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
+	int i;
+
+	log_debug(1 << CXGBI_DBG_DDP,
+		"csk 0x%p, idx %u, npods %u, gl 0x%p.\n",
+		csk, idx, npods, gl);
+
+	for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
+		struct sk_buff *skb = ddp->gl_skb[idx];
+
+		/* hold on to the skb until we clear the ddp mapping */
+		skb_get(skb);
+
+		ulp_mem_io_set_hdr(skb, pm_addr);
+		cxgbi_ddp_ppod_set((struct cxgbi_pagepod *)(skb->head +
+					sizeof(struct ulp_mem_io)),
+				   hdr, gl, i * PPOD_PAGES_MAX);
+		skb->priority = CPL_PRIORITY_CONTROL;
+		cxgb3_ofld_send(cdev->lldev, skb);
+	}
+	return 0;
+}
+
+static void ddp_clear_map(struct cxgbi_hba *chba, unsigned int tag,
+			  unsigned int idx, unsigned int npods)
+{
+	struct cxgbi_device *cdev = chba->cdev;
+	struct cxgbi_ddp_info *ddp = cdev->ddp;
+	unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
+	int i;
+
+	log_debug(1 << CXGBI_DBG_DDP,
+		"cdev 0x%p, idx %u, npods %u, tag 0x%x.\n",
+		cdev, idx, npods, tag);
+
+	for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
+		struct sk_buff *skb = ddp->gl_skb[idx];
+
+		if (!skb) {
+			pr_err("tag 0x%x, 0x%x, %d/%u, skb NULL.\n",
+				tag, idx, i, npods);
+			continue;
+		}
+		ddp->gl_skb[idx] = NULL;
+		memset(skb->head + sizeof(struct ulp_mem_io), 0, PPOD_SIZE);
+		ulp_mem_io_set_hdr(skb, pm_addr);
+		skb->priority = CPL_PRIORITY_CONTROL;
+		cxgb3_ofld_send(cdev->lldev, skb);
+	}
+}
+
+static void ddp_free_gl_skb(struct cxgbi_ddp_info *ddp, int idx, int cnt)
+{
+	int i;
+
+	log_debug(1 << CXGBI_DBG_DDP,
+		"ddp 0x%p, idx %d, cnt %d.\n", ddp, idx, cnt);
+
+	for (i = 0; i < cnt; i++, idx++)
+		if (ddp->gl_skb[idx]) {
+			kfree_skb(ddp->gl_skb[idx]);
+			ddp->gl_skb[idx] = NULL;
+		}
+}
+
+static int ddp_alloc_gl_skb(struct cxgbi_ddp_info *ddp, int idx,
+				   int cnt, gfp_t gfp)
+{
+	int i;
+
+	log_debug(1 << CXGBI_DBG_DDP,
+		"ddp 0x%p, idx %d, cnt %d.\n", ddp, idx, cnt);
+
+	for (i = 0; i < cnt; i++) {
+		struct sk_buff *skb = alloc_cpl(sizeof(struct ulp_mem_io) +
+						PPOD_SIZE, 0, gfp);
+		if (skb) {
+			ddp->gl_skb[idx + i] = skb;
+		} else {
+			ddp_free_gl_skb(ddp, idx, i);
+			return -ENOMEM;
+		}
+	}
+	return 0;
+}
+
+static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk,
+				       unsigned int tid, int pg_idx, bool reply)
+{
+	struct sk_buff *skb = alloc_cpl(sizeof(struct cpl_set_tcb_field), 0,
+					GFP_KERNEL);
+	struct cpl_set_tcb_field *req;
+	u64 val = pg_idx < DDP_PGIDX_MAX ? pg_idx : 0;
+
+	log_debug(1 << CXGBI_DBG_DDP,
+		"csk 0x%p, tid %u, pg_idx %d.\n", csk, tid, pg_idx);
+	if (!skb)
+		return -ENOMEM;
+
+	/* set up ulp submode and page size */
+	req = (struct cpl_set_tcb_field *)skb->head;
+	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
+	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
+	req->reply = V_NO_REPLY(reply ? 0 : 1);
+	req->cpu_idx = 0;
+	req->word = htons(31);
+	req->mask = cpu_to_be64(0xF0000000);
+	req->val = cpu_to_be64(val << 28);
+	skb->priority = CPL_PRIORITY_CONTROL;
+
+	cxgb3_ofld_send(csk->cdev->lldev, skb);
+	return 0;
+}
+
+/**
+ * cxgb3i_setup_conn_digest - setup conn. digest setting
+ * @csk: cxgb tcp socket
+ * @tid: connection id
+ * @hcrc: header digest enabled
+ * @dcrc: data digest enabled
+ * @reply: request reply from h/w
+ * set up the iscsi digest settings for a connection identified by tid
+ */
+static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
+			     int hcrc, int dcrc, int reply)
+{
+	struct sk_buff *skb = alloc_cpl(sizeof(struct cpl_set_tcb_field), 0,
+					GFP_KERNEL);
+	struct cpl_set_tcb_field *req;
+	u64 val = (hcrc ? 1 : 0) | (dcrc ? 2 : 0);
+
+	log_debug(1 << CXGBI_DBG_DDP,
+		"csk 0x%p, tid %u, crc %d,%d.\n", csk, tid, hcrc, dcrc);
+	if (!skb)
+		return -ENOMEM;
+
+	/* set up ulp submode and page size */
+	req = (struct cpl_set_tcb_field *)skb->head;
+	req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
+	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
+	req->reply = V_NO_REPLY(reply ? 0 : 1);
+	req->cpu_idx = 0;
+	req->word = htons(31);
+	req->mask = cpu_to_be64(0x0F000000);
+	req->val = cpu_to_be64(val << 24);
+	skb->priority = CPL_PRIORITY_CONTROL;
+
+	cxgb3_ofld_send(csk->cdev->lldev, skb);
+	return 0;
+}
+
+/**
+ * t3_ddp_cleanup - release the cxgb3 adapter's ddp resource
+ * @cdev: cxgb3i adapter
+ * release all the resource held by the ddp pagepod manager for a given
+ * adapter if needed
+ */
+
+static void t3_ddp_cleanup(struct cxgbi_device *cdev)
+{
+	struct t3cdev *tdev = (struct t3cdev *)cdev->lldev;
+
+	if (cxgbi_ddp_cleanup(cdev)) {
+		pr_info("t3dev 0x%p, ulp_iscsi no more user.\n", tdev);
+		tdev->ulp_iscsi = NULL;
+	}
+}
+
+/**
+ * ddp_init - initialize the cxgb3 adapter's ddp resource
+ * @cdev: cxgb3i adapter
+ * initialize the ddp pagepod manager for a given adapter
+ */
+static int cxgb3i_ddp_init(struct cxgbi_device *cdev)
+{
+	struct t3cdev *tdev = (struct t3cdev *)cdev->lldev;
+	struct cxgbi_ddp_info *ddp = tdev->ulp_iscsi;
+	struct ulp_iscsi_info uinfo;
+	unsigned int pgsz_factor[4];
+	int err;
+
+	if (ddp) {
+		kref_get(&ddp->refcnt);
+		pr_warn("t3dev 0x%p, ddp 0x%p already set up.\n",
+			tdev, tdev->ulp_iscsi);
+		cdev->ddp = ddp;
+		return -EALREADY;
+	}
+
+	err = tdev->ctl(tdev, ULP_ISCSI_GET_PARAMS, &uinfo);
+	if (err < 0) {
+		pr_err("%s, failed to get iscsi param err=%d.\n",
+			 tdev->name, err);
+		return err;
+	}
+
+	err = cxgbi_ddp_init(cdev, uinfo.llimit, uinfo.ulimit,
+			uinfo.max_txsz, uinfo.max_rxsz);
+	if (err < 0)
+		return err;
+
+	ddp = cdev->ddp;
+
+	uinfo.tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
+	cxgbi_ddp_page_size_factor(pgsz_factor);
+	uinfo.ulimit = uinfo.llimit + (ddp->nppods << PPOD_SIZE_SHIFT);
+
+	err = tdev->ctl(tdev, ULP_ISCSI_SET_PARAMS, &uinfo);
+	if (err < 0) {
+		pr_warn("%s unable to set iscsi param err=%d, ddp disabled.\n",
+			tdev->name, err);
+		cxgbi_ddp_cleanup(cdev);
+		return err;
+	}
+	tdev->ulp_iscsi = ddp;
+
+	cdev->csk_ddp_free_gl_skb = ddp_free_gl_skb;
+	cdev->csk_ddp_alloc_gl_skb = ddp_alloc_gl_skb;
+	cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
+	cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
+	cdev->csk_ddp_set = ddp_set_map;
+	cdev->csk_ddp_clear = ddp_clear_map;
+
+	pr_info("tdev 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u, "
+		"%u/%u.\n",
+		tdev, ddp->nppods, ddp->idx_bits, ddp->idx_mask,
+		ddp->rsvd_tag_mask, ddp->max_txsz, uinfo.max_txsz,
+		ddp->max_rxsz, uinfo.max_rxsz);
+	return 0;
+}
+
+static void cxgb3i_dev_close(struct t3cdev *t3dev)
+{
+	struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
+
+	if (!cdev || cdev->flags & CXGBI_FLAG_ADAPTER_RESET) {
+		pr_info("0x%p close, f 0x%x.\n", cdev, cdev ? cdev->flags : 0);
+		return;
+	}
+
+	cxgbi_device_unregister(cdev);
+}
+
+/**
+ * cxgb3i_dev_open - init a t3 adapter structure and any h/w settings
+ * @t3dev: t3cdev adapter
+ */
+static void cxgb3i_dev_open(struct t3cdev *t3dev)
+{
+	struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
+	struct adapter *adapter = tdev2adap(t3dev);
+	int i, err;
+
+	if (cdev) {
+		pr_info("0x%p, updating.\n", cdev);
+		return;
+	}
+
+	cdev = cxgbi_device_register(0, adapter->params.nports);
+	if (!cdev) {
+		pr_warn("device 0x%p register failed.\n", t3dev);
+		return;
+	}
+
+	cdev->flags = CXGBI_FLAG_DEV_T3 | CXGBI_FLAG_IPV4_SET;
+	cdev->lldev = t3dev;
+	cdev->pdev = adapter->pdev;
+	cdev->ports = adapter->port;
+	cdev->nports = adapter->params.nports;
+	cdev->mtus = adapter->params.mtus;
+	cdev->nmtus = NMTUS;
+	cdev->snd_win = cxgb3i_snd_win;
+	cdev->rcv_win = cxgb3i_rcv_win;
+	cdev->rx_credit_thres = cxgb3i_rx_credit_thres;
+	cdev->skb_tx_rsvd = CXGB3I_TX_HEADER_LEN;
+	cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr_norss);
+	cdev->dev_ddp_cleanup = t3_ddp_cleanup;
+	cdev->itp = &cxgb3i_iscsi_transport;
+
+	err = cxgb3i_ddp_init(cdev);
+	if (err) {
+		pr_info("0x%p ddp init failed\n", cdev);
+		goto err_out;
+	}
+
+	err = cxgb3i_ofld_init(cdev);
+	if (err) {
+		pr_info("0x%p offload init failed\n", cdev);
+		goto err_out;
+	}
+
+	err = cxgbi_hbas_add(cdev, CXGB3I_MAX_LUN, CXGBI_MAX_CONN,
+				&cxgb3i_host_template, cxgb3i_stt);
+	if (err)
+		goto err_out;
+
+	for (i = 0; i < cdev->nports; i++)
+		cdev->hbas[i]->ipv4addr =
+			cxgb3i_get_private_ipv4addr(cdev->ports[i]);
+
+	pr_info("cdev 0x%p, f 0x%x, t3dev 0x%p open, err %d.\n",
+		cdev, cdev ? cdev->flags : 0, t3dev, err);
+	return;
+
+err_out:
+	cxgbi_device_unregister(cdev);
+}
+
+static void cxgb3i_dev_event_handler(struct t3cdev *t3dev, u32 event, u32 port)
+{
+	struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
+
+	log_debug(1 << CXGBI_DBG_TOE,
+		"0x%p, cdev 0x%p, event 0x%x, port 0x%x.\n",
+		t3dev, cdev, event, port);
+	if (!cdev)
+		return;
+
+	switch (event) {
+	case OFFLOAD_STATUS_DOWN:
+		cdev->flags |= CXGBI_FLAG_ADAPTER_RESET;
+		break;
+	case OFFLOAD_STATUS_UP:
+		cdev->flags &= ~CXGBI_FLAG_ADAPTER_RESET;
+		break;
+	}
+}
+
+/**
+ * cxgb3i_init_module - module init entry point
+ *
+ * initialize any driver wide global data structures and register itself
+ *	with the cxgb3 module
+ */
+static int __init cxgb3i_init_module(void)
+{
+	int rc;
+
+	printk(KERN_INFO "%s", version);
+
+	rc = cxgbi_iscsi_init(&cxgb3i_iscsi_transport, &cxgb3i_stt);
+	if (rc < 0)
+		return rc;
+
+	cxgb3_register_client(&t3_client);
+	return 0;
+}
+
+/**
+ * cxgb3i_exit_module - module cleanup/exit entry point
+ *
+ * go through the driver hba list and for each hba, release any resource held.
+ *	and unregisters iscsi transport and the cxgb3 module
+ */
+static void __exit cxgb3i_exit_module(void)
+{
+	cxgb3_unregister_client(&t3_client);
+	cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T3);
+	cxgbi_iscsi_cleanup(&cxgb3i_iscsi_transport, &cxgb3i_stt);
+}
+
+module_init(cxgb3i_init_module);
+module_exit(cxgb3i_exit_module);

drivers/scsi/cxgbi/cxgb3i/cxgb3i.h

···
+/*
+ * cxgb3i.h: Chelsio S3xx iSCSI driver.
+ *
+ * Copyright (c) 2008 Chelsio Communications, Inc.
+ *
+ * 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.
+ *
+ * Written by: Karen Xie ([e-mail])
+ */
+
+#ifndef __CXGB3I_H__
+#define __CXGB3I_H__
+
+#define CXGB3I_SCSI_HOST_QDEPTH 1024
+#define CXGB3I_MAX_LUN		512
+#define ISCSI_PDU_NONPAYLOAD_MAX \
+	(sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE + 2*ISCSI_DIGEST_SIZE)
+
+/*for TX: a skb must have a headroom of at least TX_HEADER_LEN bytes */
+#define CXGB3I_TX_HEADER_LEN \
+	(sizeof(struct tx_data_wr) + sizeof(struct sge_opaque_hdr))
+
+extern cxgb3_cpl_handler_func cxgb3i_cpl_handlers[NUM_CPL_CMDS];
+
+#define cxgb3i_get_private_ipv4addr(ndev) \
+	(((struct port_info *)(netdev_priv(ndev)))->iscsi_ipv4addr)
+#define cxgb3i_set_private_ipv4addr(ndev, addr) \
+	(((struct port_info *)(netdev_priv(ndev)))->iscsi_ipv4addr) = addr
+
+struct cpl_iscsi_hdr_norss {
+	union opcode_tid ot;
+	u16 pdu_len_ddp;
+	u16 len;
+	u32 seq;
+	u16 urg;
+	u8 rsvd;
+	u8 status;
+};
+
+struct cpl_rx_data_ddp_norss {
+	union opcode_tid ot;
+	u16 urg;
+	u16 len;
+	u32 seq;
+	u32 nxt_seq;
+	u32 ulp_crc;
+	u32 ddp_status;
+};
+#endif