tgt: removal

Now that the ibmvstgt driver as the only user of scsi_tgt is gone, the
scsi_tgt kernel module, the CONFIG_SCSI_TGT, CONFIG_SCSI_SRP_TGT_ATTRS and
CONFIG_SCSI_FC_TGT_ATTRS kbuild variable, the scsi_host_template
transfer_response method are no longer needed.

[hch: minor updates to the current tree, changelog update]
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>

drivers/scsi/Kconfig

@@ -304,13 +304,6 @@ config SCSI_SRP_ATTRS
 	  If you wish to export transport-specific information about
 	  each attached SRP device to sysfs, say Y.
 
-config SCSI_SRP_TGT_ATTRS
-	bool "SCSI target support for SRP Transport Attributes"
-	depends on SCSI_SRP_ATTRS
-	depends on SCSI_TGT = y || SCSI_TGT = SCSI_SRP_ATTRS
-	help
-		If you want to use SCSI target mode drivers enable this option.
-
 endmenu
 
 menuconfig SCSI_LOWLEVEL

drivers/scsi/Makefile

@@ -20,7 +20,6 @@ CFLAGS_gdth.o    = # -DDEBUG_GDTH=2 -D__SERIAL__ -D__COM2__ -DGDTH_STATISTICS
 obj-$(CONFIG_PCMCIA)		+= pcmcia/
 
 obj-$(CONFIG_SCSI)		+= scsi_mod.o
-obj-$(CONFIG_SCSI_TGT)		+= scsi_tgt.o
 
 obj-$(CONFIG_RAID_ATTRS)	+= raid_class.o
 
@@ -171,8 +170,6 @@ scsi_mod-$(CONFIG_PM)		+= scsi_pm.o
 
 hv_storvsc-y			:= storvsc_drv.o
 
-scsi_tgt-y			+= scsi_tgt_lib.o scsi_tgt_if.o
-
 sd_mod-objs	:= sd.o
 sd_mod-$(CONFIG_BLK_DEV_INTEGRITY) += sd_dif.o
 

drivers/scsi/scsi_tgt_if.c

-/*
- * SCSI target kernel/user interface functions
- *
- * Copyright (C) 2005 FUJITA Tomonori <tomof@acm.org>
- * Copyright (C) 2005 Mike Christie <michaelc@cs.wisc.edu>
- *
- * 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/miscdevice.h>
-#include <linux/gfp.h>
-#include <linux/file.h>
-#include <linux/export.h>
-#include <net/tcp.h>
-#include <scsi/scsi.h>
-#include <scsi/scsi_cmnd.h>
-#include <scsi/scsi_device.h>
-#include <scsi/scsi_host.h>
-#include <scsi/scsi_tgt.h>
-#include <scsi/scsi_tgt_if.h>
-
-#include <asm/cacheflush.h>
-
-#include "scsi_tgt_priv.h"
-
-#if TGT_RING_SIZE < PAGE_SIZE
-#  define TGT_RING_SIZE PAGE_SIZE
-#endif
-
-#define TGT_RING_PAGES (TGT_RING_SIZE >> PAGE_SHIFT)
-#define TGT_EVENT_PER_PAGE (PAGE_SIZE / sizeof(struct tgt_event))
-#define TGT_MAX_EVENTS (TGT_EVENT_PER_PAGE * TGT_RING_PAGES)
-
-struct tgt_ring {
-	u32 tr_idx;
-	unsigned long tr_pages[TGT_RING_PAGES];
-	spinlock_t tr_lock;
-};
-
-/* tx_ring : kernel->user, rx_ring : user->kernel */
-static struct tgt_ring tx_ring, rx_ring;
-static DECLARE_WAIT_QUEUE_HEAD(tgt_poll_wait);
-
-static inline void tgt_ring_idx_inc(struct tgt_ring *ring)
-{
-	if (ring->tr_idx == TGT_MAX_EVENTS - 1)
-		ring->tr_idx = 0;
-	else
-		ring->tr_idx++;
-}
-
-static struct tgt_event *tgt_head_event(struct tgt_ring *ring, u32 idx)
-{
-	u32 pidx, off;
-
-	pidx = idx / TGT_EVENT_PER_PAGE;
-	off = idx % TGT_EVENT_PER_PAGE;
-
-	return (struct tgt_event *)
-		(ring->tr_pages[pidx] + sizeof(struct tgt_event) * off);
-}
-
-static int tgt_uspace_send_event(u32 type, struct tgt_event *p)
-{
-	struct tgt_event *ev;
-	struct tgt_ring *ring = &tx_ring;
-	unsigned long flags;
-	int err = 0;
-
-	spin_lock_irqsave(&ring->tr_lock, flags);
-
-	ev = tgt_head_event(ring, ring->tr_idx);
-	if (!ev->hdr.status)
-		tgt_ring_idx_inc(ring);
-	else
-		err = -BUSY;
-
-	spin_unlock_irqrestore(&ring->tr_lock, flags);
-
-	if (err)
-		return err;
-
-	memcpy(ev, p, sizeof(*ev));
-	ev->hdr.type = type;
-	mb();
-	ev->hdr.status = 1;
-
-	flush_dcache_page(virt_to_page(ev));
-
-	wake_up_interruptible(&tgt_poll_wait);
-
-	return 0;
-}
-
-int scsi_tgt_uspace_send_cmd(struct scsi_cmnd *cmd, u64 itn_id,
-			     struct scsi_lun *lun, u64 tag)
-{
-	struct Scsi_Host *shost = scsi_tgt_cmd_to_host(cmd);
-	struct tgt_event ev;
-	int err;
-
-	memset(&ev, 0, sizeof(ev));
-	ev.p.cmd_req.host_no = shost->host_no;
-	ev.p.cmd_req.itn_id = itn_id;
-	ev.p.cmd_req.data_len = scsi_bufflen(cmd);
-	memcpy(ev.p.cmd_req.scb, cmd->cmnd, sizeof(ev.p.cmd_req.scb));
-	memcpy(ev.p.cmd_req.lun, lun, sizeof(ev.p.cmd_req.lun));
-	ev.p.cmd_req.attribute = cmd->tag;
-	ev.p.cmd_req.tag = tag;
-
-	dprintk("%p %d %u %x %llx\n", cmd, shost->host_no,
-		ev.p.cmd_req.data_len, cmd->tag,
-		(unsigned long long) ev.p.cmd_req.tag);
-
-	err = tgt_uspace_send_event(TGT_KEVENT_CMD_REQ, &ev);
-	if (err)
-		eprintk("tx buf is full, could not send\n");
-
-	return err;
-}
-
-int scsi_tgt_uspace_send_status(struct scsi_cmnd *cmd, u64 itn_id, u64 tag)
-{
-	struct Scsi_Host *shost = scsi_tgt_cmd_to_host(cmd);
-	struct tgt_event ev;
-	int err;
-
-	memset(&ev, 0, sizeof(ev));
-	ev.p.cmd_done.host_no = shost->host_no;
-	ev.p.cmd_done.itn_id = itn_id;
-	ev.p.cmd_done.tag = tag;
-	ev.p.cmd_done.result = cmd->result;
-
-	dprintk("%p %d %llu %u %x\n", cmd, shost->host_no,
-		(unsigned long long) ev.p.cmd_req.tag,
-		ev.p.cmd_req.data_len, cmd->tag);
-
-	err = tgt_uspace_send_event(TGT_KEVENT_CMD_DONE, &ev);
-	if (err)
-		eprintk("tx buf is full, could not send\n");
-
-	return err;
-}
-
-int scsi_tgt_uspace_send_tsk_mgmt(int host_no, u64 itn_id, int function,
-				  u64 tag, struct scsi_lun *scsilun, void *data)
-{
-	struct tgt_event ev;
-	int err;
-
-	memset(&ev, 0, sizeof(ev));
-	ev.p.tsk_mgmt_req.host_no = host_no;
-	ev.p.tsk_mgmt_req.itn_id = itn_id;
-	ev.p.tsk_mgmt_req.function = function;
-	ev.p.tsk_mgmt_req.tag = tag;
-	memcpy(ev.p.tsk_mgmt_req.lun, scsilun, sizeof(ev.p.tsk_mgmt_req.lun));
-	ev.p.tsk_mgmt_req.mid = (u64) (unsigned long) data;
-
-	dprintk("%d %x %llx %llx\n", host_no, function, (unsigned long long) tag,
-		(unsigned long long) ev.p.tsk_mgmt_req.mid);
-
-	err = tgt_uspace_send_event(TGT_KEVENT_TSK_MGMT_REQ, &ev);
-	if (err)
-		eprintk("tx buf is full, could not send\n");
-
-	return err;
-}
-
-int scsi_tgt_uspace_send_it_nexus_request(int host_no, u64 itn_id,
-					  int function, char *initiator_id)
-{
-	struct tgt_event ev;
-	int err;
-
-	memset(&ev, 0, sizeof(ev));
-	ev.p.it_nexus_req.host_no = host_no;
-	ev.p.it_nexus_req.function = function;
-	ev.p.it_nexus_req.itn_id = itn_id;
-	if (initiator_id)
-		strncpy(ev.p.it_nexus_req.initiator_id, initiator_id,
-			sizeof(ev.p.it_nexus_req.initiator_id));
-
-	dprintk("%d %x %llx\n", host_no, function, (unsigned long long)itn_id);
-
-	err = tgt_uspace_send_event(TGT_KEVENT_IT_NEXUS_REQ, &ev);
-	if (err)
-		eprintk("tx buf is full, could not send\n");
-
-	return err;
-}
-
-static int event_recv_msg(struct tgt_event *ev)
-{
-	int err = 0;
-
-	switch (ev->hdr.type) {
-	case TGT_UEVENT_CMD_RSP:
-		err = scsi_tgt_kspace_exec(ev->p.cmd_rsp.host_no,
-					   ev->p.cmd_rsp.itn_id,
-					   ev->p.cmd_rsp.result,
-					   ev->p.cmd_rsp.tag,
-					   ev->p.cmd_rsp.uaddr,
-					   ev->p.cmd_rsp.len,
-					   ev->p.cmd_rsp.sense_uaddr,
-					   ev->p.cmd_rsp.sense_len,
-					   ev->p.cmd_rsp.rw);
-		break;
-	case TGT_UEVENT_TSK_MGMT_RSP:
-		err = scsi_tgt_kspace_tsk_mgmt(ev->p.tsk_mgmt_rsp.host_no,
-					       ev->p.tsk_mgmt_rsp.itn_id,
-					       ev->p.tsk_mgmt_rsp.mid,
-					       ev->p.tsk_mgmt_rsp.result);
-		break;
-	case TGT_UEVENT_IT_NEXUS_RSP:
-		err = scsi_tgt_kspace_it_nexus_rsp(ev->p.it_nexus_rsp.host_no,
-						   ev->p.it_nexus_rsp.itn_id,
-						   ev->p.it_nexus_rsp.result);
-		break;
-	default:
-		eprintk("unknown type %d\n", ev->hdr.type);
-		err = -EINVAL;
-	}
-
-	return err;
-}
-
-static ssize_t tgt_write(struct file *file, const char __user * buffer,
-			 size_t count, loff_t * ppos)
-{
-	struct tgt_event *ev;
-	struct tgt_ring *ring = &rx_ring;
-
-	while (1) {
-		ev = tgt_head_event(ring, ring->tr_idx);
-		/* do we need this? */
-		flush_dcache_page(virt_to_page(ev));
-
-		if (!ev->hdr.status)
-			break;
-
-		tgt_ring_idx_inc(ring);
-		event_recv_msg(ev);
-		ev->hdr.status = 0;
-	};
-
-	return count;
-}
-
-static unsigned int tgt_poll(struct file * file, struct poll_table_struct *wait)
-{
-	struct tgt_event *ev;
-	struct tgt_ring *ring = &tx_ring;
-	unsigned long flags;
-	unsigned int mask = 0;
-	u32 idx;
-
-	poll_wait(file, &tgt_poll_wait, wait);
-
-	spin_lock_irqsave(&ring->tr_lock, flags);
-
-	idx = ring->tr_idx ? ring->tr_idx - 1 : TGT_MAX_EVENTS - 1;
-	ev = tgt_head_event(ring, idx);
-	if (ev->hdr.status)
-		mask |= POLLIN | POLLRDNORM;
-
-	spin_unlock_irqrestore(&ring->tr_lock, flags);
-
-	return mask;
-}
-
-static int uspace_ring_map(struct vm_area_struct *vma, unsigned long addr,
-			   struct tgt_ring *ring)
-{
-	int i, err;
-
-	for (i = 0; i < TGT_RING_PAGES; i++) {
-		struct page *page = virt_to_page(ring->tr_pages[i]);
-		err = vm_insert_page(vma, addr, page);
-		if (err)
-			return err;
-		addr += PAGE_SIZE;
-	}
-
-	return 0;
-}
-
-static int tgt_mmap(struct file *filp, struct vm_area_struct *vma)
-{
-	unsigned long addr;
-	int err;
-
-	if (vma->vm_pgoff)
-		return -EINVAL;
-
-	if (vma->vm_end - vma->vm_start != TGT_RING_SIZE * 2) {
-		eprintk("mmap size must be %lu, not %lu \n",
-			TGT_RING_SIZE * 2, vma->vm_end - vma->vm_start);
-		return -EINVAL;
-	}
-
-	addr = vma->vm_start;
-	err = uspace_ring_map(vma, addr, &tx_ring);
-	if (err)
-		return err;
-	err = uspace_ring_map(vma, addr + TGT_RING_SIZE, &rx_ring);
-
-	return err;
-}
-
-static int tgt_open(struct inode *inode, struct file *file)
-{
-	tx_ring.tr_idx = rx_ring.tr_idx = 0;
-
-	return 0;
-}
-
-static const struct file_operations tgt_fops = {
-	.owner		= THIS_MODULE,
-	.open		= tgt_open,
-	.poll		= tgt_poll,
-	.write		= tgt_write,
-	.mmap		= tgt_mmap,
-	.llseek		= noop_llseek,
-};
-
-static struct miscdevice tgt_miscdev = {
-	.minor = MISC_DYNAMIC_MINOR,
-	.name = "tgt",
-	.fops = &tgt_fops,
-};
-
-static void tgt_ring_exit(struct tgt_ring *ring)
-{
-	int i;
-
-	for (i = 0; i < TGT_RING_PAGES; i++)
-		free_page(ring->tr_pages[i]);
-}
-
-static int tgt_ring_init(struct tgt_ring *ring)
-{
-	int i;
-
-	spin_lock_init(&ring->tr_lock);
-
-	for (i = 0; i < TGT_RING_PAGES; i++) {
-		ring->tr_pages[i] = get_zeroed_page(GFP_KERNEL);
-		if (!ring->tr_pages[i]) {
-			eprintk("out of memory\n");
-			return -ENOMEM;
-		}
-	}
-
-	return 0;
-}
-
-void scsi_tgt_if_exit(void)
-{
-	tgt_ring_exit(&tx_ring);
-	tgt_ring_exit(&rx_ring);
-	misc_deregister(&tgt_miscdev);
-}
-
-int scsi_tgt_if_init(void)
-{
-	int err;
-
-	err = tgt_ring_init(&tx_ring);
-	if (err)
-		return err;
-
-	err = tgt_ring_init(&rx_ring);
-	if (err)
-		goto free_tx_ring;
-
-	err = misc_register(&tgt_miscdev);
-	if (err)
-		goto free_rx_ring;
-
-	return 0;
-free_rx_ring:
-	tgt_ring_exit(&rx_ring);
-free_tx_ring:
-	tgt_ring_exit(&tx_ring);
-
-	return err;
-}

drivers/scsi/scsi_tgt_priv.h

-struct scsi_cmnd;
-struct scsi_lun;
-struct Scsi_Host;
-struct task_struct;
-
-/* tmp - will replace with SCSI logging stuff */
-#define eprintk(fmt, args...)					\
-do {								\
-	printk("%s(%d) " fmt, __func__, __LINE__, ##args);	\
-} while (0)
-
-#define dprintk(fmt, args...)
-/* #define dprintk eprintk */
-
-extern void scsi_tgt_if_exit(void);
-extern int scsi_tgt_if_init(void);
-
-extern int scsi_tgt_uspace_send_cmd(struct scsi_cmnd *cmd, u64 it_nexus_id,
-				    struct scsi_lun *lun, u64 tag);
-extern int scsi_tgt_uspace_send_status(struct scsi_cmnd *cmd, u64 it_nexus_id,
-				       u64 tag);
-extern int scsi_tgt_kspace_exec(int host_no, u64 it_nexus_id, int result, u64 tag,
-				unsigned long uaddr, u32 len,
-				unsigned long sense_uaddr, u32 sense_len, u8 rw);
-extern int scsi_tgt_uspace_send_tsk_mgmt(int host_no, u64 it_nexus_id,
-					 int function, u64 tag,
-					 struct scsi_lun *scsilun, void *data);
-extern int scsi_tgt_kspace_tsk_mgmt(int host_no, u64 it_nexus_id,
-				    u64 mid, int result);
-extern int scsi_tgt_uspace_send_it_nexus_request(int host_no, u64 it_nexus_id,
-						 int function, char *initiator);
-extern int scsi_tgt_kspace_it_nexus_rsp(int host_no, u64 it_nexus_id, int result);

drivers/scsi/scsi_transport_fc.c

@@ -39,7 +39,6 @@
 #include <scsi/scsi_netlink_fc.h>
 #include <scsi/scsi_bsg_fc.h>
 #include "scsi_priv.h"
-#include "scsi_transport_fc_internal.h"
 
 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
 static void fc_vport_sched_delete(struct work_struct *work);
@@ -3008,10 +3007,6 @@ fc_remote_port_delete(struct fc_rport  *rport)
 
 	spin_unlock_irqrestore(shost->host_lock, flags);
 
-	if (rport->roles & FC_PORT_ROLE_FCP_INITIATOR &&
-	    shost->active_mode & MODE_TARGET)
-		fc_tgt_it_nexus_destroy(shost, (unsigned long)rport);
-
 	scsi_target_block(&rport->dev);
 
 	/* see if we need to kill io faster than waiting for device loss */
@@ -3052,7 +3047,6 @@ fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
 	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 	unsigned long flags;
 	int create = 0;
-	int ret;
 
 	spin_lock_irqsave(shost->host_lock, flags);
 	if (roles & FC_PORT_ROLE_FCP_TARGET) {
@@ -3061,12 +3055,6 @@ fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
 			create = 1;
 		} else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
 			create = 1;
-	} else if (shost->active_mode & MODE_TARGET) {
-		ret = fc_tgt_it_nexus_create(shost, (unsigned long)rport,
-					     (char *)&rport->node_name);
-		if (ret)
-			printk(KERN_ERR "FC Remore Port tgt nexus failed %d\n",
-			       ret);
 	}
 
 	rport->roles = roles;

drivers/scsi/scsi_transport_fc_internal.h

-#include <scsi/scsi_tgt.h>
-
-#ifdef CONFIG_SCSI_FC_TGT_ATTRS
-static inline int fc_tgt_it_nexus_create(struct Scsi_Host *shost, u64 itn_id,
-					 char *initiator)
-{
-	return scsi_tgt_it_nexus_create(shost, itn_id, initiator);
-}
-
-static inline int fc_tgt_it_nexus_destroy(struct Scsi_Host *shost, u64 itn_id)
-{
-	return scsi_tgt_it_nexus_destroy(shost, itn_id);
-}
-#else
-static inline int fc_tgt_it_nexus_create(struct Scsi_Host *shost, u64 itn_id,
-					 char *initiator)
-{
-	return 0;
-}
-
-static inline int fc_tgt_it_nexus_destroy(struct Scsi_Host *shost, u64 itn_id)
-{
-	return 0;
-}
-
-#endif

drivers/scsi/scsi_transport_srp.c

@@ -33,7 +33,6 @@
 #include <scsi/scsi_transport.h>
 #include <scsi/scsi_transport_srp.h>
 #include "scsi_priv.h"
-#include "scsi_transport_srp_internal.h"
 
 struct srp_host_attrs {
 	atomic_t next_port_id;
@@ -746,18 +745,6 @@ struct srp_rport *srp_rport_add(struct Scsi_Host *shost,
 		return ERR_PTR(ret);
 	}
 
-	if (shost->active_mode & MODE_TARGET &&
-	    ids->roles == SRP_RPORT_ROLE_INITIATOR) {
-		ret = srp_tgt_it_nexus_create(shost, (unsigned long)rport,
-					      rport->port_id);
-		if (ret) {
-			device_del(&rport->dev);
-			transport_destroy_device(&rport->dev);
-			put_device(&rport->dev);
-			return ERR_PTR(ret);
-		}
-	}
-
 	transport_add_device(&rport->dev);
 	transport_configure_device(&rport->dev);
 
@@ -774,11 +761,6 @@ EXPORT_SYMBOL_GPL(srp_rport_add);
 void srp_rport_del(struct srp_rport *rport)
 {
 	struct device *dev = &rport->dev;
-	struct Scsi_Host *shost = dev_to_shost(dev->parent);
-
-	if (shost->active_mode & MODE_TARGET &&
-	    rport->roles == SRP_RPORT_ROLE_INITIATOR)
-		srp_tgt_it_nexus_destroy(shost, (unsigned long)rport);
 
 	transport_remove_device(dev);
 	device_del(dev);

drivers/scsi/scsi_transport_srp_internal.h

-#include <scsi/scsi_tgt.h>
-
-#ifdef CONFIG_SCSI_SRP_TGT_ATTRS
-static inline int srp_tgt_it_nexus_create(struct Scsi_Host *shost, u64 itn_id,
-					  char *initiator)
-{
-	return scsi_tgt_it_nexus_create(shost, itn_id, initiator);
-}
-
-static inline int srp_tgt_it_nexus_destroy(struct Scsi_Host *shost, u64 itn_id)
-{
-	return scsi_tgt_it_nexus_destroy(shost, itn_id);
-}
-
-#else
-static inline int srp_tgt_it_nexus_create(struct Scsi_Host *shost, u64 itn_id,
-					  char *initiator)
-{
-	return 0;
-}
-static inline int srp_tgt_it_nexus_destroy(struct Scsi_Host *shost, u64 itn_id)
-{
-	return 0;
-}
-#endif

include/scsi/scsi_host.h

@@ -131,27 +131,6 @@ struct scsi_host_template {
 	 */
 	int (* queuecommand)(struct Scsi_Host *, struct scsi_cmnd *);
 
-	/*
-	 * The transfer functions are used to queue a scsi command to
-	 * the LLD. When the driver is finished processing the command
-	 * the done callback is invoked.
-	 *
-	 * This is called to inform the LLD to transfer
-	 * scsi_bufflen(cmd) bytes. scsi_sg_count(cmd) speciefies the
-	 * number of scatterlist entried in the command and
-	 * scsi_sglist(cmd) returns the scatterlist.
-	 *
-	 * return values: see queuecommand
-	 *
-	 * If the LLD accepts the cmd, it should set the result to an
-	 * appropriate value when completed before calling the done function.
-	 *
-	 * STATUS: REQUIRED FOR TARGET DRIVERS
-	 */
-	/* TODO: rename */
-	int (* transfer_response)(struct scsi_cmnd *,
-				  void (*done)(struct scsi_cmnd *));
-
 	/*
 	 * This is an error handling strategy routine.  You don't need to
 	 * define one of these if you don't want to - there is a default

include/scsi/scsi_tgt.h

-/*
- * SCSI target definitions
- */
-
-#include <linux/dma-mapping.h>
-
-struct Scsi_Host;
-struct scsi_cmnd;
-struct scsi_lun;
-
-extern struct Scsi_Host *scsi_tgt_cmd_to_host(struct scsi_cmnd *);
-extern int scsi_tgt_alloc_queue(struct Scsi_Host *);
-extern void scsi_tgt_free_queue(struct Scsi_Host *);
-extern int scsi_tgt_queue_command(struct scsi_cmnd *, u64, struct scsi_lun *, u64);
-extern int scsi_tgt_tsk_mgmt_request(struct Scsi_Host *, u64, int, u64,
-				     struct scsi_lun *, void *);
-extern struct scsi_cmnd *scsi_host_get_command(struct Scsi_Host *,
-					       enum dma_data_direction,	gfp_t);
-extern void scsi_host_put_command(struct Scsi_Host *, struct scsi_cmnd *);
-extern int scsi_tgt_it_nexus_create(struct Scsi_Host *, u64, char *);
-extern int scsi_tgt_it_nexus_destroy(struct Scsi_Host *, u64);

include/scsi/scsi_tgt_if.h

-/*
- * SCSI target kernel/user interface
- *
- * Copyright (C) 2005 FUJITA Tomonori <tomof@acm.org>
- * Copyright (C) 2005 Mike Christie <michaelc@cs.wisc.edu>
- *
- * 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
- */
-#ifndef __SCSI_TARGET_IF_H
-#define __SCSI_TARGET_IF_H
-
-/* user -> kernel */
-#define	TGT_UEVENT_CMD_RSP		0x0001
-#define	TGT_UEVENT_IT_NEXUS_RSP		0x0002
-#define	TGT_UEVENT_TSK_MGMT_RSP		0x0003
-
-/* kernel -> user */
-#define	TGT_KEVENT_CMD_REQ		0x1001
-#define	TGT_KEVENT_CMD_DONE		0x1002
-#define	TGT_KEVENT_IT_NEXUS_REQ		0x1003
-#define	TGT_KEVENT_TSK_MGMT_REQ		0x1004
-
-struct tgt_event_hdr {
-	uint16_t version;
-	uint16_t status;
-	uint16_t type;
-	uint16_t len;
-} __attribute__ ((aligned (sizeof(uint64_t))));
-
-struct tgt_event {
-	struct tgt_event_hdr hdr;
-
-	union {
-		/* user-> kernel */
-		struct {
-			int host_no;
-			int result;
-			aligned_u64 itn_id;
-			aligned_u64 tag;
-			aligned_u64 uaddr;
-			aligned_u64 sense_uaddr;
-			uint32_t len;
-			uint32_t sense_len;
-			uint8_t rw;
-		} cmd_rsp;
-		struct {
-			int host_no;
-			int result;
-			aligned_u64 itn_id;
-			aligned_u64 mid;
-		} tsk_mgmt_rsp;
-		struct {
-			__s32 host_no;
-			__s32 result;
-			aligned_u64 itn_id;
-			__u32 function;
-		} it_nexus_rsp;
-
-		/* kernel -> user */
-		struct {
-			int host_no;
-			uint32_t data_len;
-			aligned_u64 itn_id;
-			uint8_t scb[16];
-			uint8_t lun[8];
-			int attribute;
-			aligned_u64 tag;
-		} cmd_req;
-		struct {
-			int host_no;
-			int result;
-			aligned_u64 itn_id;
-			aligned_u64 tag;
-		} cmd_done;
-		struct {
-			int host_no;
-			int function;
-			aligned_u64 itn_id;
-			aligned_u64 tag;
-			uint8_t lun[8];
-			aligned_u64 mid;
-		} tsk_mgmt_req;
-		struct {
-			__s32 host_no;
-			__u32 function;
-			aligned_u64 itn_id;
-			__u32 max_cmds;
-			__u8 initiator_id[16];
-		} it_nexus_req;
-	} p;
-} __attribute__ ((aligned (sizeof(uint64_t))));
-
-#define TGT_RING_SIZE (1UL << 16)
-
-#endif