libsrp: removal

Remove the libsrp module which was only used by the now removed ibmvstgt
driver.

Signed-off-by: Christoph Hellwig <[e-mail]>
Reviewed-by: Paolo Bonzini <[e-mail]>
Reviewed-by: Hannes Reinecke <[e-mail]>

drivers/scsi/Kconfig

···
 	  This driver supports PMC-Sierra PCIE SAS/SATA 8x6G SPC 8001 chip
 	  based host adapters.
 
-config SCSI_SRP
-	tristate "SCSI RDMA Protocol helper library"
-	depends on SCSI && PCI
-	select SCSI_TGT
-	help
-	  If you wish to use SRP target drivers, say Y.
-
-	  To compile this driver as a module, choose M here: the
-	  module will be called libsrp.
-
 config SCSI_BFA_FC
 	tristate "Brocade BFA Fibre Channel Support"
 	depends on PCI && SCSI

drivers/scsi/Makefile

···
 obj-$(CONFIG_SCSI_SNI_53C710)	+= 53c700.o sni_53c710.o
 obj-$(CONFIG_SCSI_NSP32)	+= nsp32.o
 obj-$(CONFIG_SCSI_IPR)		+= ipr.o
-obj-$(CONFIG_SCSI_SRP)		+= libsrp.o
 obj-$(CONFIG_SCSI_IBMVSCSI)	+= ibmvscsi/
 obj-$(CONFIG_SCSI_IBMVFC)	+= ibmvscsi/
 obj-$(CONFIG_SCSI_HPTIOP)	+= hptiop.o

drivers/scsi/libsrp.c

···
-/*
- * SCSI RDMA Protocol lib functions
- *
- * Copyright (C) 2006 FUJITA Tomonori <[e-mail]>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
- * 02110-1301 USA
- */
-#include <linux/err.h>
-#include <linux/slab.h>
-#include <linux/kfifo.h>
-#include <linux/scatterlist.h>
-#include <linux/dma-mapping.h>
-#include <linux/module.h>
-#include <scsi/scsi.h>
-#include <scsi/scsi_cmnd.h>
-#include <scsi/scsi_tcq.h>
-#include <scsi/scsi_tgt.h>
-#include <scsi/srp.h>
-#include <scsi/libsrp.h>
-
-enum srp_task_attributes {
-	SRP_SIMPLE_TASK = 0,
-	SRP_HEAD_TASK = 1,
-	SRP_ORDERED_TASK = 2,
-	SRP_ACA_TASK = 4
-};
-
-/* tmp - will replace with SCSI logging stuff */
-#define eprintk(fmt, args...)					\
-do {								\
-	printk("%s(%d) " fmt, __func__, __LINE__, ##args);	\
-} while (0)
-/* #define dprintk eprintk */
-#define dprintk(fmt, args...)
-
-static int srp_iu_pool_alloc(struct srp_queue *q, size_t max,
-			     struct srp_buf **ring)
-{
-	int i;
-	struct iu_entry *iue;
-
-	q->pool = kcalloc(max, sizeof(struct iu_entry *), GFP_KERNEL);
-	if (!q->pool)
-		return -ENOMEM;
-	q->items = kcalloc(max, sizeof(struct iu_entry), GFP_KERNEL);
-	if (!q->items)
-		goto free_pool;
-
-	spin_lock_init(&q->lock);
-	kfifo_init(&q->queue, (void *) q->pool, max * sizeof(void *));
-
-	for (i = 0, iue = q->items; i < max; i++) {
-		kfifo_in(&q->queue, (void *) &iue, sizeof(void *));
-		iue->sbuf = ring[i];
-		iue++;
-	}
-	return 0;
-
-	kfree(q->items);
-free_pool:
-	kfree(q->pool);
-	return -ENOMEM;
-}
-
-static void srp_iu_pool_free(struct srp_queue *q)
-{
-	kfree(q->items);
-	kfree(q->pool);
-}
-
-static struct srp_buf **srp_ring_alloc(struct device *dev,
-				       size_t max, size_t size)
-{
-	int i;
-	struct srp_buf **ring;
-
-	ring = kcalloc(max, sizeof(struct srp_buf *), GFP_KERNEL);
-	if (!ring)
-		return NULL;
-
-	for (i = 0; i < max; i++) {
-		ring[i] = kzalloc(sizeof(struct srp_buf), GFP_KERNEL);
-		if (!ring[i])
-			goto out;
-		ring[i]->buf = dma_alloc_coherent(dev, size, &ring[i]->dma,
-						  GFP_KERNEL);
-		if (!ring[i]->buf)
-			goto out;
-	}
-	return ring;
-
-out:
-	for (i = 0; i < max && ring[i]; i++) {
-		if (ring[i]->buf)
-			dma_free_coherent(dev, size, ring[i]->buf, ring[i]->dma);
-		kfree(ring[i]);
-	}
-	kfree(ring);
-
-	return NULL;
-}
-
-static void srp_ring_free(struct device *dev, struct srp_buf **ring, size_t max,
-			  size_t size)
-{
-	int i;
-
-	for (i = 0; i < max; i++) {
-		dma_free_coherent(dev, size, ring[i]->buf, ring[i]->dma);
-		kfree(ring[i]);
-	}
-	kfree(ring);
-}
-
-int srp_target_alloc(struct srp_target *target, struct device *dev,
-		     size_t nr, size_t iu_size)
-{
-	int err;
-
-	spin_lock_init(&target->lock);
-	INIT_LIST_HEAD(&target->cmd_queue);
-
-	target->dev = dev;
-	dev_set_drvdata(target->dev, target);
-
-	target->srp_iu_size = iu_size;
-	target->rx_ring_size = nr;
-	target->rx_ring = srp_ring_alloc(target->dev, nr, iu_size);
-	if (!target->rx_ring)
-		return -ENOMEM;
-	err = srp_iu_pool_alloc(&target->iu_queue, nr, target->rx_ring);
-	if (err)
-		goto free_ring;
-
-	return 0;
-
-free_ring:
-	srp_ring_free(target->dev, target->rx_ring, nr, iu_size);
-	return -ENOMEM;
-}
-EXPORT_SYMBOL_GPL(srp_target_alloc);
-
-void srp_target_free(struct srp_target *target)
-{
-	srp_ring_free(target->dev, target->rx_ring, target->rx_ring_size,
-		      target->srp_iu_size);
-	srp_iu_pool_free(&target->iu_queue);
-}
-EXPORT_SYMBOL_GPL(srp_target_free);
-
-struct iu_entry *srp_iu_get(struct srp_target *target)
-{
-	struct iu_entry *iue = NULL;
-
-	if (kfifo_out_locked(&target->iu_queue.queue, (void *) &iue,
-		sizeof(void *), &target->iu_queue.lock) != sizeof(void *)) {
-			WARN_ONCE(1, "unexpected fifo state");
-			return NULL;
-	}
-	if (!iue)
-		return iue;
-	iue->target = target;
-	INIT_LIST_HEAD(&iue->ilist);
-	iue->flags = 0;
-	return iue;
-}
-EXPORT_SYMBOL_GPL(srp_iu_get);
-
-void srp_iu_put(struct iu_entry *iue)
-{
-	kfifo_in_locked(&iue->target->iu_queue.queue, (void *) &iue,
-			sizeof(void *), &iue->target->iu_queue.lock);
-}
-EXPORT_SYMBOL_GPL(srp_iu_put);
-
-static int srp_direct_data(struct scsi_cmnd *sc, struct srp_direct_buf *md,
-			   enum dma_data_direction dir, srp_rdma_t rdma_io,
-			   int dma_map, int ext_desc)
-{
-	struct iu_entry *iue = NULL;
-	struct scatterlist *sg = NULL;
-	int err, nsg = 0, len;
-
-	if (dma_map) {
-		iue = (struct iu_entry *) sc->SCp.ptr;
-		sg = scsi_sglist(sc);
-
-		dprintk("%p %u %u %d\n", iue, scsi_bufflen(sc),
-			md->len, scsi_sg_count(sc));
-
-		nsg = dma_map_sg(iue->target->dev, sg, scsi_sg_count(sc),
-				 DMA_BIDIRECTIONAL);
-		if (!nsg) {
-			printk("fail to map %p %d\n", iue, scsi_sg_count(sc));
-			return 0;
-		}
-		len = min(scsi_bufflen(sc), md->len);
-	} else
-		len = md->len;
-
-	err = rdma_io(sc, sg, nsg, md, 1, dir, len);
-
-	if (dma_map)
-		dma_unmap_sg(iue->target->dev, sg, nsg, DMA_BIDIRECTIONAL);
-
-	return err;
-}
-
-static int srp_indirect_data(struct scsi_cmnd *sc, struct srp_cmd *cmd,
-			     struct srp_indirect_buf *id,
-			     enum dma_data_direction dir, srp_rdma_t rdma_io,
-			     int dma_map, int ext_desc)
-{
-	struct iu_entry *iue = NULL;
-	struct srp_direct_buf *md = NULL;
-	struct scatterlist dummy, *sg = NULL;
-	dma_addr_t token = 0;
-	int err = 0;
-	int nmd, nsg = 0, len;
-
-	if (dma_map || ext_desc) {
-		iue = (struct iu_entry *) sc->SCp.ptr;
-		sg = scsi_sglist(sc);
-
-		dprintk("%p %u %u %d %d\n",
-			iue, scsi_bufflen(sc), id->len,
-			cmd->data_in_desc_cnt, cmd->data_out_desc_cnt);
-	}
-
-	nmd = id->table_desc.len / sizeof(struct srp_direct_buf);
-
-	if ((dir == DMA_FROM_DEVICE && nmd == cmd->data_in_desc_cnt) ||
-	    (dir == DMA_TO_DEVICE && nmd == cmd->data_out_desc_cnt)) {
-		md = &id->desc_list[0];
-		goto rdma;
-	}
-
-	if (ext_desc && dma_map) {
-		md = dma_alloc_coherent(iue->target->dev, id->table_desc.len,
-				&token, GFP_KERNEL);
-		if (!md) {
-			eprintk("Can't get dma memory %u\n", id->table_desc.len);
-			return -ENOMEM;
-		}
-
-		sg_init_one(&dummy, md, id->table_desc.len);
-		sg_dma_address(&dummy) = token;
-		sg_dma_len(&dummy) = id->table_desc.len;
-		err = rdma_io(sc, &dummy, 1, &id->table_desc, 1, DMA_TO_DEVICE,
-			      id->table_desc.len);
-		if (err) {
-			eprintk("Error copying indirect table %d\n", err);
-			goto free_mem;
-		}
-	} else {
-		eprintk("This command uses external indirect buffer\n");
-		return -EINVAL;
-	}
-
-rdma:
-	if (dma_map) {
-		nsg = dma_map_sg(iue->target->dev, sg, scsi_sg_count(sc),
-				 DMA_BIDIRECTIONAL);
-		if (!nsg) {
-			eprintk("fail to map %p %d\n", iue, scsi_sg_count(sc));
-			err = -EIO;
-			goto free_mem;
-		}
-		len = min(scsi_bufflen(sc), id->len);
-	} else
-		len = id->len;
-
-	err = rdma_io(sc, sg, nsg, md, nmd, dir, len);
-
-	if (dma_map)
-		dma_unmap_sg(iue->target->dev, sg, nsg, DMA_BIDIRECTIONAL);
-
-free_mem:
-	if (token && dma_map)
-		dma_free_coherent(iue->target->dev, id->table_desc.len, md, token);
-
-	return err;
-}
-
-static int data_out_desc_size(struct srp_cmd *cmd)
-{
-	int size = 0;
-	u8 fmt = cmd->buf_fmt >> 4;
-
-	switch (fmt) {
-	case SRP_NO_DATA_DESC:
-		break;
-	case SRP_DATA_DESC_DIRECT:
-		size = sizeof(struct srp_direct_buf);
-		break;
-	case SRP_DATA_DESC_INDIRECT:
-		size = sizeof(struct srp_indirect_buf) +
-			sizeof(struct srp_direct_buf) * cmd->data_out_desc_cnt;
-		break;
-	default:
-		eprintk("client error. Invalid data_out_format %x\n", fmt);
-		break;
-	}
-	return size;
-}
-
-/*
- * TODO: this can be called multiple times for a single command if it
- * has very long data.
- */
-int srp_transfer_data(struct scsi_cmnd *sc, struct srp_cmd *cmd,
-		      srp_rdma_t rdma_io, int dma_map, int ext_desc)
-{
-	struct srp_direct_buf *md;
-	struct srp_indirect_buf *id;
-	enum dma_data_direction dir;
-	int offset, err = 0;
-	u8 format;
-
-	offset = cmd->add_cdb_len & ~3;
-
-	dir = srp_cmd_direction(cmd);
-	if (dir == DMA_FROM_DEVICE)
-		offset += data_out_desc_size(cmd);
-
-	if (dir == DMA_TO_DEVICE)
-		format = cmd->buf_fmt >> 4;
-	else
-		format = cmd->buf_fmt & ((1U << 4) - 1);
-
-	switch (format) {
-	case SRP_NO_DATA_DESC:
-		break;
-	case SRP_DATA_DESC_DIRECT:
-		md = (struct srp_direct_buf *)
-			(cmd->add_data + offset);
-		err = srp_direct_data(sc, md, dir, rdma_io, dma_map, ext_desc);
-		break;
-	case SRP_DATA_DESC_INDIRECT:
-		id = (struct srp_indirect_buf *)
-			(cmd->add_data + offset);
-		err = srp_indirect_data(sc, cmd, id, dir, rdma_io, dma_map,
-					ext_desc);
-		break;
-	default:
-		eprintk("Unknown format %d %x\n", dir, format);
-		err = -EINVAL;
-	}
-
-	return err;
-}
-EXPORT_SYMBOL_GPL(srp_transfer_data);
-
-static int vscsis_data_length(struct srp_cmd *cmd, enum dma_data_direction dir)
-{
-	struct srp_direct_buf *md;
-	struct srp_indirect_buf *id;
-	int len = 0, offset = cmd->add_cdb_len & ~3;
-	u8 fmt;
-
-	if (dir == DMA_TO_DEVICE)
-		fmt = cmd->buf_fmt >> 4;
-	else {
-		fmt = cmd->buf_fmt & ((1U << 4) - 1);
-		offset += data_out_desc_size(cmd);
-	}
-
-	switch (fmt) {
-	case SRP_NO_DATA_DESC:
-		break;
-	case SRP_DATA_DESC_DIRECT:
-		md = (struct srp_direct_buf *) (cmd->add_data + offset);
-		len = md->len;
-		break;
-	case SRP_DATA_DESC_INDIRECT:
-		id = (struct srp_indirect_buf *) (cmd->add_data + offset);
-		len = id->len;
-		break;
-	default:
-		eprintk("invalid data format %x\n", fmt);
-		break;
-	}
-	return len;
-}
-
-int srp_cmd_queue(struct Scsi_Host *shost, struct srp_cmd *cmd, void *info,
-		  u64 itn_id, u64 addr)
-{
-	enum dma_data_direction dir;
-	struct scsi_cmnd *sc;
-	int tag, len, err;
-
-	switch (cmd->task_attr) {
-	case SRP_SIMPLE_TASK:
-		tag = MSG_SIMPLE_TAG;
-		break;
-	case SRP_ORDERED_TASK:
-		tag = MSG_ORDERED_TAG;
-		break;
-	case SRP_HEAD_TASK:
-		tag = MSG_HEAD_TAG;
-		break;
-	default:
-		eprintk("Task attribute %d not supported\n", cmd->task_attr);
-		tag = MSG_ORDERED_TAG;
-	}
-
-	dir = srp_cmd_direction(cmd);
-	len = vscsis_data_length(cmd, dir);
-
-	dprintk("%p %x %lx %d %d %d %llx\n", info, cmd->cdb[0],
-		cmd->lun, dir, len, tag, (unsigned long long) cmd->tag);
-
-	sc = scsi_host_get_command(shost, dir, GFP_KERNEL);
-	if (!sc)
-		return -ENOMEM;
-
-	sc->SCp.ptr = info;
-	memcpy(sc->cmnd, cmd->cdb, MAX_COMMAND_SIZE);
-	sc->sdb.length = len;
-	sc->sdb.table.sgl = (void *) (unsigned long) addr;
-	sc->tag = tag;
-	err = scsi_tgt_queue_command(sc, itn_id, (struct scsi_lun *)&cmd->lun,
-				     cmd->tag);
-	if (err)
-		scsi_host_put_command(shost, sc);
-
-	return err;
-}
-EXPORT_SYMBOL_GPL(srp_cmd_queue);
-
-MODULE_DESCRIPTION("SCSI RDMA Protocol lib functions");
-MODULE_AUTHOR("FUJITA Tomonori");
-MODULE_LICENSE("GPL");

include/scsi/libsrp.h

···
-#ifndef __LIBSRP_H__
-#define __LIBSRP_H__
-
-#include <linux/list.h>
-#include <linux/kfifo.h>
-#include <scsi/scsi_cmnd.h>
-#include <scsi/scsi_host.h>
-#include <scsi/srp.h>
-
-enum iue_flags {
-	V_DIOVER,
-	V_WRITE,
-	V_LINKED,
-	V_FLYING,
-};
-
-struct srp_buf {
-	dma_addr_t dma;
-	void *buf;
-};
-
-struct srp_queue {
-	void *pool;
-	void *items;
-	struct kfifo queue;
-	spinlock_t lock;
-};
-
-struct srp_target {
-	struct Scsi_Host *shost;
-	struct device *dev;
-
-	spinlock_t lock;
-	struct list_head cmd_queue;
-
-	size_t srp_iu_size;
-	struct srp_queue iu_queue;
-	size_t rx_ring_size;
-	struct srp_buf **rx_ring;
-
-	void *ldata;
-};
-
-struct iu_entry {
-	struct srp_target *target;
-
-	struct list_head ilist;
-	dma_addr_t remote_token;
-	unsigned long flags;
-
-	struct srp_buf *sbuf;
-};
-
-typedef int (srp_rdma_t)(struct scsi_cmnd *, struct scatterlist *, int,
-			 struct srp_direct_buf *, int,
-			 enum dma_data_direction, unsigned int);
-extern int srp_target_alloc(struct srp_target *, struct device *, size_t, size_t);
-extern void srp_target_free(struct srp_target *);
-
-extern struct iu_entry *srp_iu_get(struct srp_target *);
-extern void srp_iu_put(struct iu_entry *);
-
-extern int srp_cmd_queue(struct Scsi_Host *, struct srp_cmd *, void *, u64, u64);
-extern int srp_transfer_data(struct scsi_cmnd *, struct srp_cmd *,
-			     srp_rdma_t, int, int);
-
-
-static inline struct srp_target *host_to_srp_target(struct Scsi_Host *host)
-{
-	return (struct srp_target *) host->hostdata;
-}
-
-static inline int srp_cmd_direction(struct srp_cmd *cmd)
-{
-	return (cmd->buf_fmt >> 4) ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
-}
-
-#endif