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/*******************************************************************************
* Filename: target_core_transport.c
*
* This file contains the Generic Target Engine Core.
*
* Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
* Copyright (c) 2005, 2006, 2007 SBE, Inc.
* Copyright (c) 2007-2010 Rising Tide Systems
* Copyright (c) 2008-2010 Linux-iSCSI.org
*
* Nicholas A. Bellinger <nab@kernel.org>
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
******************************************************************************/

#include <linux/net.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/slab.h>
#include <linux/blkdev.h>
#include <linux/spinlock.h>
#include <linux/kthread.h>
#include <linux/in.h>
#include <linux/cdrom.h>
#include <linux/module.h>
#include <linux/ratelimit.h>
#include <asm/unaligned.h>
#include <net/sock.h>
#include <net/tcp.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_tcq.h>

#include <target/target_core_base.h>
#include <target/target_core_backend.h>
#include <target/target_core_fabric.h>
#include <target/target_core_configfs.h>

#include "target_core_internal.h"
#include "target_core_alua.h"
#include "target_core_pr.h"
#include "target_core_ua.h"

static int sub_api_initialized;

static struct workqueue_struct *target_completion_wq;
static struct kmem_cache *se_sess_cache;
struct kmem_cache *se_ua_cache;
struct kmem_cache *t10_pr_reg_cache;
struct kmem_cache *t10_alua_lu_gp_cache;
struct kmem_cache *t10_alua_lu_gp_mem_cache;
struct kmem_cache *t10_alua_tg_pt_gp_cache;
struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;

static void transport_complete_task_attr(struct se_cmd *cmd);
static void transport_handle_queue_full(struct se_cmd *cmd,
struct se_device *dev);
static int transport_generic_get_mem(struct se_cmd *cmd);
static int target_get_sess_cmd(struct se_session *, struct se_cmd *, bool);
static void transport_put_cmd(struct se_cmd *cmd);
static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
static void target_complete_ok_work(struct work_struct *work);

int init_se_kmem_caches(void)
{
se_sess_cache = kmem_cache_create("se_sess_cache",
sizeof(struct se_session), __alignof__(struct se_session),
0, NULL);
if (!se_sess_cache) {
pr_err("kmem_cache_create() for struct se_session"
" failed\n");
goto out;
}
se_ua_cache = kmem_cache_create("se_ua_cache",
sizeof(struct se_ua), __alignof__(struct se_ua),
0, NULL);
if (!se_ua_cache) {
pr_err("kmem_cache_create() for struct se_ua failed\n");
goto out_free_sess_cache;
}
t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
sizeof(struct t10_pr_registration),
__alignof__(struct t10_pr_registration), 0, NULL);
if (!t10_pr_reg_cache) {
pr_err("kmem_cache_create() for struct t10_pr_registration"
" failed\n");
goto out_free_ua_cache;
}
t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
0, NULL);
if (!t10_alua_lu_gp_cache) {
pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
" failed\n");
goto out_free_pr_reg_cache;
}
t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
sizeof(struct t10_alua_lu_gp_member),
__alignof__(struct t10_alua_lu_gp_member), 0, NULL);
if (!t10_alua_lu_gp_mem_cache) {
pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
"cache failed\n");
goto out_free_lu_gp_cache;
}
t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
sizeof(struct t10_alua_tg_pt_gp),
__alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
if (!t10_alua_tg_pt_gp_cache) {
pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
"cache failed\n");
goto out_free_lu_gp_mem_cache;
}
t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
"t10_alua_tg_pt_gp_mem_cache",
sizeof(struct t10_alua_tg_pt_gp_member),
__alignof__(struct t10_alua_tg_pt_gp_member),
0, NULL);
if (!t10_alua_tg_pt_gp_mem_cache) {
pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
"mem_t failed\n");
goto out_free_tg_pt_gp_cache;
}

target_completion_wq = alloc_workqueue("target_completion",
WQ_MEM_RECLAIM, 0);
if (!target_completion_wq)
goto out_free_tg_pt_gp_mem_cache;

return 0;

out_free_tg_pt_gp_mem_cache:
kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
out_free_tg_pt_gp_cache:
kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
out_free_lu_gp_mem_cache:
kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
out_free_lu_gp_cache:
kmem_cache_destroy(t10_alua_lu_gp_cache);
out_free_pr_reg_cache:
kmem_cache_destroy(t10_pr_reg_cache);
out_free_ua_cache:
kmem_cache_destroy(se_ua_cache);
out_free_sess_cache:
kmem_cache_destroy(se_sess_cache);
out:
return -ENOMEM;
}

void release_se_kmem_caches(void)
{
destroy_workqueue(target_completion_wq);
kmem_cache_destroy(se_sess_cache);
kmem_cache_destroy(se_ua_cache);
kmem_cache_destroy(t10_pr_reg_cache);
kmem_cache_destroy(t10_alua_lu_gp_cache);
kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
}

/* This code ensures unique mib indexes are handed out. */
static DEFINE_SPINLOCK(scsi_mib_index_lock);
static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];

/*
* Allocate a new row index for the entry type specified
*/
u32 scsi_get_new_index(scsi_index_t type)
{
u32 new_index;

BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));

spin_lock(&scsi_mib_index_lock);
new_index = ++scsi_mib_index[type];
spin_unlock(&scsi_mib_index_lock);

return new_index;
}

void transport_subsystem_check_init(void)
{
int ret;

if (sub_api_initialized)
return;

ret = request_module("target_core_iblock");
if (ret != 0)
pr_err("Unable to load target_core_iblock\n");

ret = request_module("target_core_file");
if (ret != 0)
pr_err("Unable to load target_core_file\n");

ret = request_module("target_core_pscsi");
if (ret != 0)
pr_err("Unable to load target_core_pscsi\n");

ret = request_module("target_core_stgt");
if (ret != 0)
pr_err("Unable to load target_core_stgt\n");

sub_api_initialized = 1;
return;
}

struct se_session *transport_init_session(void)
{
struct se_session *se_sess;

se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
if (!se_sess) {
pr_err("Unable to allocate struct se_session from"
" se_sess_cache\n");
return ERR_PTR(-ENOMEM);
}
INIT_LIST_HEAD(&se_sess->sess_list);
INIT_LIST_HEAD(&se_sess->sess_acl_list);
INIT_LIST_HEAD(&se_sess->sess_cmd_list);
spin_lock_init(&se_sess->sess_cmd_lock);
kref_init(&se_sess->sess_kref);

return se_sess;
}
EXPORT_SYMBOL(transport_init_session);

/*
* Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
*/
void __transport_register_session(
struct se_portal_group *se_tpg,
struct se_node_acl *se_nacl,
struct se_session *se_sess,
void *fabric_sess_ptr)
{
unsigned char buf[PR_REG_ISID_LEN];

se_sess->se_tpg = se_tpg;
se_sess->fabric_sess_ptr = fabric_sess_ptr;
/*
* Used by struct se_node_acl's under ConfigFS to locate active se_session-t
*
* Only set for struct se_session's that will actually be moving I/O.
* eg: *NOT* discovery sessions.
*/
if (se_nacl) {
/*
* If the fabric module supports an ISID based TransportID,
* save this value in binary from the fabric I_T Nexus now.
*/
if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
memset(&buf[0], 0, PR_REG_ISID_LEN);
se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
&buf[0], PR_REG_ISID_LEN);
se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
}
kref_get(&se_nacl->acl_kref);

spin_lock_irq(&se_nacl->nacl_sess_lock);
/*
* The se_nacl->nacl_sess pointer will be set to the
* last active I_T Nexus for each struct se_node_acl.
*/
se_nacl->nacl_sess = se_sess;

list_add_tail(&se_sess->sess_acl_list,
&se_nacl->acl_sess_list);
spin_unlock_irq(&se_nacl->nacl_sess_lock);
}
list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);

pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
}
EXPORT_SYMBOL(__transport_register_session);

void transport_register_session(
struct se_portal_group *se_tpg,
struct se_node_acl *se_nacl,
struct se_session *se_sess,
void *fabric_sess_ptr)
{
unsigned long flags;

spin_lock_irqsave(&se_tpg->session_lock, flags);
__transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
spin_unlock_irqrestore(&se_tpg->session_lock, flags);
}
EXPORT_SYMBOL(transport_register_session);

void target_release_session(struct kref *kref)
{
struct se_session *se_sess = container_of(kref,
struct se_session, sess_kref);
struct se_portal_group *se_tpg = se_sess->se_tpg;

se_tpg->se_tpg_tfo->close_session(se_sess);
}

void target_get_session(struct se_session *se_sess)
{
kref_get(&se_sess->sess_kref);
}
EXPORT_SYMBOL(target_get_session);

void target_put_session(struct se_session *se_sess)
{
struct se_portal_group *tpg = se_sess->se_tpg;

if (tpg->se_tpg_tfo->put_session != NULL) {
tpg->se_tpg_tfo->put_session(se_sess);
return;
}
kref_put(&se_sess->sess_kref, target_release_session);
}
EXPORT_SYMBOL(target_put_session);

static void target_complete_nacl(struct kref *kref)
{
struct se_node_acl *nacl = container_of(kref,
struct se_node_acl, acl_kref);

complete(&nacl->acl_free_comp);
}

void target_put_nacl(struct se_node_acl *nacl)
{
kref_put(&nacl->acl_kref, target_complete_nacl);
}

void transport_deregister_session_configfs(struct se_session *se_sess)
{
struct se_node_acl *se_nacl;
unsigned long flags;
/*
* Used by struct se_node_acl's under ConfigFS to locate active struct se_session
*/
se_nacl = se_sess->se_node_acl;
if (se_nacl) {
spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
if (se_nacl->acl_stop == 0)
list_del(&se_sess->sess_acl_list);
/*
* If the session list is empty, then clear the pointer.
* Otherwise, set the struct se_session pointer from the tail
* element of the per struct se_node_acl active session list.
*/
if (list_empty(&se_nacl->acl_sess_list))
se_nacl->nacl_sess = NULL;
else {
se_nacl->nacl_sess = container_of(
se_nacl->acl_sess_list.prev,
struct se_session, sess_acl_list);
}
spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
}
}
EXPORT_SYMBOL(transport_deregister_session_configfs);

void transport_free_session(struct se_session *se_sess)
{
kmem_cache_free(se_sess_cache, se_sess);
}
EXPORT_SYMBOL(transport_free_session);

void transport_deregister_session(struct se_session *se_sess)
{
struct se_portal_group *se_tpg = se_sess->se_tpg;
struct target_core_fabric_ops *se_tfo;
struct se_node_acl *se_nacl;
unsigned long flags;
bool comp_nacl = true;

if (!se_tpg) {
transport_free_session(se_sess);
return;
}
se_tfo = se_tpg->se_tpg_tfo;

spin_lock_irqsave(&se_tpg->session_lock, flags);
list_del(&se_sess->sess_list);
se_sess->se_tpg = NULL;
se_sess->fabric_sess_ptr = NULL;
spin_unlock_irqrestore(&se_tpg->session_lock, flags);

/*
* Determine if we need to do extra work for this initiator node's
* struct se_node_acl if it had been previously dynamically generated.
*/
se_nacl = se_sess->se_node_acl;

spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
if (se_nacl && se_nacl->dynamic_node_acl) {
if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
list_del(&se_nacl->acl_list);
se_tpg->num_node_acls--;
spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
core_tpg_wait_for_nacl_pr_ref(se_nacl);
core_free_device_list_for_node(se_nacl, se_tpg);
se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);

comp_nacl = false;
spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
}
}
spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);

pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
se_tpg->se_tpg_tfo->get_fabric_name());
/*
* If last kref is dropping now for an explict NodeACL, awake sleeping
* ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
* removal context.
*/
if (se_nacl && comp_nacl == true)
target_put_nacl(se_nacl);

transport_free_session(se_sess);
}
EXPORT_SYMBOL(transport_deregister_session);

/*
* Called with cmd->t_state_lock held.
*/
static void target_remove_from_state_list(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
unsigned long flags;

if (!dev)
return;

if (cmd->transport_state & CMD_T_BUSY)
return;

spin_lock_irqsave(&dev->execute_task_lock, flags);
if (cmd->state_active) {
list_del(&cmd->state_list);
cmd->state_active = false;
}
spin_unlock_irqrestore(&dev->execute_task_lock, flags);
}

static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists)
{
unsigned long flags;

spin_lock_irqsave(&cmd->t_state_lock, flags);
/*
* Determine if IOCTL context caller in requesting the stopping of this
* command for LUN shutdown purposes.
*/
if (cmd->transport_state & CMD_T_LUN_STOP) {
pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
__func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));

cmd->transport_state &= ~CMD_T_ACTIVE;
if (remove_from_lists)
target_remove_from_state_list(cmd);
spin_unlock_irqrestore(&cmd->t_state_lock, flags);

complete(&cmd->transport_lun_stop_comp);
return 1;
}

if (remove_from_lists) {
target_remove_from_state_list(cmd);

/*
* Clear struct se_cmd->se_lun before the handoff to FE.
*/
cmd->se_lun = NULL;
}

/*
* Determine if frontend context caller is requesting the stopping of
* this command for frontend exceptions.
*/
if (cmd->transport_state & CMD_T_STOP) {
pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
__func__, __LINE__,
cmd->se_tfo->get_task_tag(cmd));

spin_unlock_irqrestore(&cmd->t_state_lock, flags);

complete(&cmd->t_transport_stop_comp);
return 1;
}

cmd->transport_state &= ~CMD_T_ACTIVE;
if (remove_from_lists) {
/*
* Some fabric modules like tcm_loop can release
* their internally allocated I/O reference now and
* struct se_cmd now.
*
* Fabric modules are expected to return '1' here if the
* se_cmd being passed is released at this point,
* or zero if not being released.
*/
if (cmd->se_tfo->check_stop_free != NULL) {
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
return cmd->se_tfo->check_stop_free(cmd);
}
}

spin_unlock_irqrestore(&cmd->t_state_lock, flags);
return 0;
}

static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
{
return transport_cmd_check_stop(cmd, true);
}

static void transport_lun_remove_cmd(struct se_cmd *cmd)
{
struct se_lun *lun = cmd->se_lun;
unsigned long flags;

if (!lun)
return;

spin_lock_irqsave(&cmd->t_state_lock, flags);
if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
target_remove_from_state_list(cmd);
}
spin_unlock_irqrestore(&cmd->t_state_lock, flags);

spin_lock_irqsave(&lun->lun_cmd_lock, flags);
if (!list_empty(&cmd->se_lun_node))
list_del_init(&cmd->se_lun_node);
spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
}

void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
{
if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
transport_lun_remove_cmd(cmd);

if (transport_cmd_check_stop_to_fabric(cmd))
return;
if (remove)
transport_put_cmd(cmd);
}

static void target_complete_failure_work(struct work_struct *work)
{
struct se_cmd *cmd = container_of(work, struct se_cmd, work);

transport_generic_request_failure(cmd);
}

/*
* Used when asking transport to copy Sense Data from the underlying
* Linux/SCSI struct scsi_cmnd
*/
static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
{
unsigned char *buffer = cmd->sense_buffer;
struct se_device *dev = cmd->se_dev;
u32 offset = 0;

WARN_ON(!cmd->se_lun);

if (!dev)
return NULL;

if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
return NULL;

offset = cmd->se_tfo->set_fabric_sense_len(cmd, TRANSPORT_SENSE_BUFFER);

/* Automatically padded */
cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;

pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
return &buffer[offset];
}

void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
{
struct se_device *dev = cmd->se_dev;
int success = scsi_status == GOOD;
unsigned long flags;

cmd->scsi_status = scsi_status;


spin_lock_irqsave(&cmd->t_state_lock, flags);
cmd->transport_state &= ~CMD_T_BUSY;

if (dev && dev->transport->transport_complete) {
dev->transport->transport_complete(cmd,
cmd->t_data_sg,
transport_get_sense_buffer(cmd));
if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
success = 1;
}

/*
* See if we are waiting to complete for an exception condition.
*/
if (cmd->transport_state & CMD_T_REQUEST_STOP) {
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
complete(&cmd->task_stop_comp);
return;
}

if (!success)
cmd->transport_state |= CMD_T_FAILED;

/*
* Check for case where an explict ABORT_TASK has been received
* and transport_wait_for_tasks() will be waiting for completion..
*/
if (cmd->transport_state & CMD_T_ABORTED &&
cmd->transport_state & CMD_T_STOP) {
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
complete(&cmd->t_transport_stop_comp);
return;
} else if (cmd->transport_state & CMD_T_FAILED) {
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
INIT_WORK(&cmd->work, target_complete_failure_work);
} else {
INIT_WORK(&cmd->work, target_complete_ok_work);
}

cmd->t_state = TRANSPORT_COMPLETE;
cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
spin_unlock_irqrestore(&cmd->t_state_lock, flags);

queue_work(target_completion_wq, &cmd->work);
}
EXPORT_SYMBOL(target_complete_cmd);

static void target_add_to_state_list(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
unsigned long flags;

spin_lock_irqsave(&dev->execute_task_lock, flags);
if (!cmd->state_active) {
list_add_tail(&cmd->state_list, &dev->state_list);
cmd->state_active = true;
}
spin_unlock_irqrestore(&dev->execute_task_lock, flags);
}

/*
* Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
*/
static void transport_write_pending_qf(struct se_cmd *cmd);
static void transport_complete_qf(struct se_cmd *cmd);

static void target_qf_do_work(struct work_struct *work)
{
struct se_device *dev = container_of(work, struct se_device,
qf_work_queue);
LIST_HEAD(qf_cmd_list);
struct se_cmd *cmd, *cmd_tmp;

spin_lock_irq(&dev->qf_cmd_lock);
list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
spin_unlock_irq(&dev->qf_cmd_lock);

list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
list_del(&cmd->se_qf_node);
atomic_dec(&dev->dev_qf_count);
smp_mb__after_atomic_dec();

pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
" context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
(cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
(cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
: "UNKNOWN");

if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
transport_write_pending_qf(cmd);
else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
transport_complete_qf(cmd);
}
}

unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
{
switch (cmd->data_direction) {
case DMA_NONE:
return "NONE";
case DMA_FROM_DEVICE:
return "READ";
case DMA_TO_DEVICE:
return "WRITE";
case DMA_BIDIRECTIONAL:
return "BIDI";
default:
break;
}

return "UNKNOWN";
}

void transport_dump_dev_state(
struct se_device *dev,
char *b,
int *bl)
{
*bl += sprintf(b + *bl, "Status: ");
switch (dev->dev_status) {
case TRANSPORT_DEVICE_ACTIVATED:
*bl += sprintf(b + *bl, "ACTIVATED");
break;
case TRANSPORT_DEVICE_DEACTIVATED:
*bl += sprintf(b + *bl, "DEACTIVATED");
break;
case TRANSPORT_DEVICE_SHUTDOWN:
*bl += sprintf(b + *bl, "SHUTDOWN");
break;
case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
*bl += sprintf(b + *bl, "OFFLINE");
break;
default:
*bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
break;
}

*bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
*bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
dev->se_sub_dev->se_dev_attrib.block_size,
dev->se_sub_dev->se_dev_attrib.hw_max_sectors);
*bl += sprintf(b + *bl, " ");
}

void transport_dump_vpd_proto_id(
struct t10_vpd *vpd,
unsigned char *p_buf,
int p_buf_len)
{
unsigned char buf[VPD_TMP_BUF_SIZE];
int len;

memset(buf, 0, VPD_TMP_BUF_SIZE);
len = sprintf(buf, "T10 VPD Protocol Identifier: ");

switch (vpd->protocol_identifier) {
case 0x00:
sprintf(buf+len, "Fibre Channel\n");
break;
case 0x10:
sprintf(buf+len, "Parallel SCSI\n");
break;
case 0x20:
sprintf(buf+len, "SSA\n");
break;
case 0x30:
sprintf(buf+len, "IEEE 1394\n");
break;
case 0x40:
sprintf(buf+len, "SCSI Remote Direct Memory Access"
" Protocol\n");
break;
case 0x50:
sprintf(buf+len, "Internet SCSI (iSCSI)\n");
break;
case 0x60:
sprintf(buf+len, "SAS Serial SCSI Protocol\n");
break;
case 0x70:
sprintf(buf+len, "Automation/Drive Interface Transport"
" Protocol\n");
break;
case 0x80:
sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
break;
default:
sprintf(buf+len, "Unknown 0x%02x\n",
vpd->protocol_identifier);
break;
}

if (p_buf)
strncpy(p_buf, buf, p_buf_len);
else
pr_debug("%s", buf);
}

void
transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
{
/*
* Check if the Protocol Identifier Valid (PIV) bit is set..
*
* from spc3r23.pdf section 7.5.1
*/
if (page_83[1] & 0x80) {
vpd->protocol_identifier = (page_83[0] & 0xf0);
vpd->protocol_identifier_set = 1;
transport_dump_vpd_proto_id(vpd, NULL, 0);
}
}
EXPORT_SYMBOL(transport_set_vpd_proto_id);

int transport_dump_vpd_assoc(
struct t10_vpd *vpd,
unsigned char *p_buf,
int p_buf_len)
{
unsigned char buf[VPD_TMP_BUF_SIZE];
int ret = 0;
int len;

memset(buf, 0, VPD_TMP_BUF_SIZE);
len = sprintf(buf, "T10 VPD Identifier Association: ");

switch (vpd->association) {
case 0x00:
sprintf(buf+len, "addressed logical unit\n");
break;
case 0x10:
sprintf(buf+len, "target port\n");
break;
case 0x20:
sprintf(buf+len, "SCSI target device\n");
break;
default:
sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
ret = -EINVAL;
break;
}

if (p_buf)
strncpy(p_buf, buf, p_buf_len);
else
pr_debug("%s", buf);

return ret;
}

int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
{
/*
* The VPD identification association..
*
* from spc3r23.pdf Section 7.6.3.1 Table 297
*/
vpd->association = (page_83[1] & 0x30);
return transport_dump_vpd_assoc(vpd, NULL, 0);
}
EXPORT_SYMBOL(transport_set_vpd_assoc);

int transport_dump_vpd_ident_type(
struct t10_vpd *vpd,
unsigned char *p_buf,
int p_buf_len)
{
unsigned char buf[VPD_TMP_BUF_SIZE];
int ret = 0;
int len;

memset(buf, 0, VPD_TMP_BUF_SIZE);
len = sprintf(buf, "T10 VPD Identifier Type: ");

switch (vpd->device_identifier_type) {
case 0x00:
sprintf(buf+len, "Vendor specific\n");
break;
case 0x01:
sprintf(buf+len, "T10 Vendor ID based\n");
break;
case 0x02:
sprintf(buf+len, "EUI-64 based\n");
break;
case 0x03:
sprintf(buf+len, "NAA\n");
break;
case 0x04:
sprintf(buf+len, "Relative target port identifier\n");
break;
case 0x08:
sprintf(buf+len, "SCSI name string\n");
break;
default:
sprintf(buf+len, "Unsupported: 0x%02x\n",
vpd->device_identifier_type);
ret = -EINVAL;
break;
}

if (p_buf) {
if (p_buf_len < strlen(buf)+1)
return -EINVAL;
strncpy(p_buf, buf, p_buf_len);
} else {
pr_debug("%s", buf);
}

return ret;
}

int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
{
/*
* The VPD identifier type..
*
* from spc3r23.pdf Section 7.6.3.1 Table 298
*/
vpd->device_identifier_type = (page_83[1] & 0x0f);
return transport_dump_vpd_ident_type(vpd, NULL, 0);
}
EXPORT_SYMBOL(transport_set_vpd_ident_type);

int transport_dump_vpd_ident(
struct t10_vpd *vpd,
unsigned char *p_buf,
int p_buf_len)
{
unsigned char buf[VPD_TMP_BUF_SIZE];
int ret = 0;

memset(buf, 0, VPD_TMP_BUF_SIZE);

switch (vpd->device_identifier_code_set) {
case 0x01: /* Binary */
sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
&vpd->device_identifier[0]);
break;
case 0x02: /* ASCII */
sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
&vpd->device_identifier[0]);
break;
case 0x03: /* UTF-8 */
sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
&vpd->device_identifier[0]);
break;
default:
sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
" 0x%02x", vpd->device_identifier_code_set);
ret = -EINVAL;
break;
}

if (p_buf)
strncpy(p_buf, buf, p_buf_len);
else
pr_debug("%s", buf);

return ret;
}

int
transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
{
static const char hex_str[] = "0123456789abcdef";
int j = 0, i = 4; /* offset to start of the identifer */

/*
* The VPD Code Set (encoding)
*
* from spc3r23.pdf Section 7.6.3.1 Table 296
*/
vpd->device_identifier_code_set = (page_83[0] & 0x0f);
switch (vpd->device_identifier_code_set) {
case 0x01: /* Binary */
vpd->device_identifier[j++] =
hex_str[vpd->device_identifier_type];
while (i < (4 + page_83[3])) {
vpd->device_identifier[j++] =
hex_str[(page_83[i] & 0xf0) >> 4];
vpd->device_identifier[j++] =
hex_str[page_83[i] & 0x0f];
i++;
}
break;
case 0x02: /* ASCII */
case 0x03: /* UTF-8 */
while (i < (4 + page_83[3]))
vpd->device_identifier[j++] = page_83[i++];
break;
default:
break;
}

return transport_dump_vpd_ident(vpd, NULL, 0);
}
EXPORT_SYMBOL(transport_set_vpd_ident);

static void core_setup_task_attr_emulation(struct se_device *dev)
{
/*
* If this device is from Target_Core_Mod/pSCSI, disable the
* SAM Task Attribute emulation.
*
* This is currently not available in upsream Linux/SCSI Target
* mode code, and is assumed to be disabled while using TCM/pSCSI.
*/
if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
return;
}

dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
" device\n", dev->transport->name,
dev->transport->get_device_rev(dev));
}

static void scsi_dump_inquiry(struct se_device *dev)
{
struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
char buf[17];
int i, device_type;
/*
* Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
*/
for (i = 0; i < 8; i++)
if (wwn->vendor[i] >= 0x20)
buf[i] = wwn->vendor[i];
else
buf[i] = ' ';
buf[i] = '\0';
pr_debug(" Vendor: %s\n", buf);

for (i = 0; i < 16; i++)
if (wwn->model[i] >= 0x20)
buf[i] = wwn->model[i];
else
buf[i] = ' ';
buf[i] = '\0';
pr_debug(" Model: %s\n", buf);

for (i = 0; i < 4; i++)
if (wwn->revision[i] >= 0x20)
buf[i] = wwn->revision[i];
else
buf[i] = ' ';
buf[i] = '\0';
pr_debug(" Revision: %s\n", buf);

device_type = dev->transport->get_device_type(dev);
pr_debug(" Type: %s ", scsi_device_type(device_type));
pr_debug(" ANSI SCSI revision: %02x\n",
dev->transport->get_device_rev(dev));
}

struct se_device *transport_add_device_to_core_hba(
struct se_hba *hba,
struct se_subsystem_api *transport,
struct se_subsystem_dev *se_dev,
u32 device_flags,
void *transport_dev,
struct se_dev_limits *dev_limits,
const char *inquiry_prod,
const char *inquiry_rev)
{
int force_pt;
struct se_device *dev;

dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
if (!dev) {
pr_err("Unable to allocate memory for se_dev_t\n");
return NULL;
}

dev->dev_flags = device_flags;
dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
dev->dev_ptr = transport_dev;
dev->se_hba = hba;
dev->se_sub_dev = se_dev;
dev->transport = transport;
INIT_LIST_HEAD(&dev->dev_list);
INIT_LIST_HEAD(&dev->dev_sep_list);
INIT_LIST_HEAD(&dev->dev_tmr_list);
INIT_LIST_HEAD(&dev->delayed_cmd_list);
INIT_LIST_HEAD(&dev->state_list);
INIT_LIST_HEAD(&dev->qf_cmd_list);
spin_lock_init(&dev->execute_task_lock);
spin_lock_init(&dev->delayed_cmd_lock);
spin_lock_init(&dev->dev_reservation_lock);
spin_lock_init(&dev->dev_status_lock);
spin_lock_init(&dev->se_port_lock);
spin_lock_init(&dev->se_tmr_lock);
spin_lock_init(&dev->qf_cmd_lock);
atomic_set(&dev->dev_ordered_id, 0);

se_dev_set_default_attribs(dev, dev_limits);

dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
dev->creation_time = get_jiffies_64();
spin_lock_init(&dev->stats_lock);

spin_lock(&hba->device_lock);
list_add_tail(&dev->dev_list, &hba->hba_dev_list);
hba->dev_count++;
spin_unlock(&hba->device_lock);
/*
* Setup the SAM Task Attribute emulation for struct se_device
*/
core_setup_task_attr_emulation(dev);
/*
* Force PR and ALUA passthrough emulation with internal object use.
*/
force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
/*
* Setup the Reservations infrastructure for struct se_device
*/
core_setup_reservations(dev, force_pt);
/*
* Setup the Asymmetric Logical Unit Assignment for struct se_device
*/
if (core_setup_alua(dev, force_pt) < 0)
goto err_dev_list;

/*
* Startup the struct se_device processing thread
*/
dev->tmr_wq = alloc_workqueue("tmr-%s", WQ_MEM_RECLAIM | WQ_UNBOUND, 1,
dev->transport->name);
if (!dev->tmr_wq) {
pr_err("Unable to create tmr workqueue for %s\n",
dev->transport->name);
goto err_dev_list;
}
/*
* Setup work_queue for QUEUE_FULL
*/
INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
/*
* Preload the initial INQUIRY const values if we are doing
* anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
* passthrough because this is being provided by the backend LLD.
* This is required so that transport_get_inquiry() copies these
* originals once back into DEV_T10_WWN(dev) for the virtual device
* setup.
*/
if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
if (!inquiry_prod || !inquiry_rev) {
pr_err("All non TCM/pSCSI plugins require"
" INQUIRY consts\n");
goto err_wq;
}

strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
}
scsi_dump_inquiry(dev);

return dev;

err_wq:
destroy_workqueue(dev->tmr_wq);
err_dev_list:
spin_lock(&hba->device_lock);
list_del(&dev->dev_list);
hba->dev_count--;
spin_unlock(&hba->device_lock);

se_release_vpd_for_dev(dev);

kfree(dev);

return NULL;
}
EXPORT_SYMBOL(transport_add_device_to_core_hba);

int target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
{
struct se_device *dev = cmd->se_dev;

if (cmd->unknown_data_length) {
cmd->data_length = size;
} else if (size != cmd->data_length) {
pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
" %u does not match SCSI CDB Length: %u for SAM Opcode:"
" 0x%02x\n", cmd->se_tfo->get_fabric_name(),
cmd->data_length, size, cmd->t_task_cdb[0]);

if (cmd->data_direction == DMA_TO_DEVICE) {
pr_err("Rejecting underflow/overflow"
" WRITE data\n");
goto out_invalid_cdb_field;
}
/*
* Reject READ_* or WRITE_* with overflow/underflow for
* type SCF_SCSI_DATA_CDB.
*/
if (dev->se_sub_dev->se_dev_attrib.block_size != 512) {
pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
" CDB on non 512-byte sector setup subsystem"
" plugin: %s\n", dev->transport->name);
/* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
goto out_invalid_cdb_field;
}
/*
* For the overflow case keep the existing fabric provided
* ->data_length. Otherwise for the underflow case, reset
* ->data_length to the smaller SCSI expected data transfer
* length.
*/
if (size > cmd->data_length) {
cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
cmd->residual_count = (size - cmd->data_length);
} else {
cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
cmd->residual_count = (cmd->data_length - size);
cmd->data_length = size;
}
}

return 0;

out_invalid_cdb_field:
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
return -EINVAL;
}

/*
* Used by fabric modules containing a local struct se_cmd within their
* fabric dependent per I/O descriptor.
*/
void transport_init_se_cmd(
struct se_cmd *cmd,
struct target_core_fabric_ops *tfo,
struct se_session *se_sess,
u32 data_length,
int data_direction,
int task_attr,
unsigned char *sense_buffer)
{
INIT_LIST_HEAD(&cmd->se_lun_node);
INIT_LIST_HEAD(&cmd->se_delayed_node);
INIT_LIST_HEAD(&cmd->se_qf_node);
INIT_LIST_HEAD(&cmd->se_cmd_list);
INIT_LIST_HEAD(&cmd->state_list);
init_completion(&cmd->transport_lun_fe_stop_comp);
init_completion(&cmd->transport_lun_stop_comp);
init_completion(&cmd->t_transport_stop_comp);
init_completion(&cmd->cmd_wait_comp);
init_completion(&cmd->task_stop_comp);
spin_lock_init(&cmd->t_state_lock);
cmd->transport_state = CMD_T_DEV_ACTIVE;

cmd->se_tfo = tfo;
cmd->se_sess = se_sess;
cmd->data_length = data_length;
cmd->data_direction = data_direction;
cmd->sam_task_attr = task_attr;
cmd->sense_buffer = sense_buffer;

cmd->state_active = false;
}
EXPORT_SYMBOL(transport_init_se_cmd);

static int transport_check_alloc_task_attr(struct se_cmd *cmd)
{
/*
* Check if SAM Task Attribute emulation is enabled for this
* struct se_device storage object
*/
if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
return 0;

if (cmd->sam_task_attr == MSG_ACA_TAG) {
pr_debug("SAM Task Attribute ACA"
" emulation is not supported\n");
return -EINVAL;
}
/*
* Used to determine when ORDERED commands should go from
* Dormant to Active status.
*/
cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
smp_mb__after_atomic_inc();
pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
cmd->se_ordered_id, cmd->sam_task_attr,
cmd->se_dev->transport->name);
return 0;
}

/* target_setup_cmd_from_cdb():
*
* Called from fabric RX Thread.
*/
int target_setup_cmd_from_cdb(
struct se_cmd *cmd,
unsigned char *cdb)
{
struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
u32 pr_reg_type = 0;
u8 alua_ascq = 0;
unsigned long flags;
int ret;

/*
* Ensure that the received CDB is less than the max (252 + 8) bytes
* for VARIABLE_LENGTH_CMD
*/
if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
pr_err("Received SCSI CDB with command_size: %d that"
" exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
return -EINVAL;
}
/*
* If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
* allocate the additional extended CDB buffer now.. Otherwise
* setup the pointer from __t_task_cdb to t_task_cdb.
*/
if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
GFP_KERNEL);
if (!cmd->t_task_cdb) {
pr_err("Unable to allocate cmd->t_task_cdb"
" %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
scsi_command_size(cdb),
(unsigned long)sizeof(cmd->__t_task_cdb));
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
cmd->scsi_sense_reason =
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -ENOMEM;
}
} else
cmd->t_task_cdb = &cmd->__t_task_cdb[0];
/*
* Copy the original CDB into cmd->
*/
memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));

/*
* Check for an existing UNIT ATTENTION condition
*/
if (core_scsi3_ua_check(cmd, cdb) < 0) {
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
return -EINVAL;
}

ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
if (ret != 0) {
/*
* Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
* The ALUA additional sense code qualifier (ASCQ) is determined
* by the ALUA primary or secondary access state..
*/
if (ret > 0) {
pr_debug("[%s]: ALUA TG Port not available, "
"SenseKey: NOT_READY, ASC/ASCQ: "
"0x04/0x%02x\n",
cmd->se_tfo->get_fabric_name(), alua_ascq);

transport_set_sense_codes(cmd, 0x04, alua_ascq);
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
return -EINVAL;
}
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
return -EINVAL;
}

/*
* Check status for SPC-3 Persistent Reservations
*/
if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type)) {
if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
cmd, cdb, pr_reg_type) != 0) {
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EBUSY;
}
/*
* This means the CDB is allowed for the SCSI Initiator port
* when said port is *NOT* holding the legacy SPC-2 or
* SPC-3 Persistent Reservation.
*/
}

ret = cmd->se_dev->transport->parse_cdb(cmd);
if (ret < 0)
return ret;

spin_lock_irqsave(&cmd->t_state_lock, flags);
cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
spin_unlock_irqrestore(&cmd->t_state_lock, flags);

/*
* Check for SAM Task Attribute Emulation
*/
if (transport_check_alloc_task_attr(cmd) < 0) {
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
return -EINVAL;
}
spin_lock(&cmd->se_lun->lun_sep_lock);
if (cmd->se_lun->lun_sep)
cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
spin_unlock(&cmd->se_lun->lun_sep_lock);
return 0;
}
EXPORT_SYMBOL(target_setup_cmd_from_cdb);

/*
* Used by fabric module frontends to queue tasks directly.
* Many only be used from process context only
*/
int transport_handle_cdb_direct(
struct se_cmd *cmd)
{
int ret;

if (!cmd->se_lun) {
dump_stack();
pr_err("cmd->se_lun is NULL\n");
return -EINVAL;
}
if (in_interrupt()) {
dump_stack();
pr_err("transport_generic_handle_cdb cannot be called"
" from interrupt context\n");
return -EINVAL;
}
/*
* Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
* outstanding descriptors are handled correctly during shutdown via
* transport_wait_for_tasks()
*
* Also, we don't take cmd->t_state_lock here as we only expect
* this to be called for initial descriptor submission.
*/
cmd->t_state = TRANSPORT_NEW_CMD;
cmd->transport_state |= CMD_T_ACTIVE;

/*
* transport_generic_new_cmd() is already handling QUEUE_FULL,
* so follow TRANSPORT_NEW_CMD processing thread context usage
* and call transport_generic_request_failure() if necessary..
*/
ret = transport_generic_new_cmd(cmd);
if (ret < 0)
transport_generic_request_failure(cmd);

return 0;
}
EXPORT_SYMBOL(transport_handle_cdb_direct);

/**
* target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
*
* @se_cmd: command descriptor to submit
* @se_sess: associated se_sess for endpoint
* @cdb: pointer to SCSI CDB
* @sense: pointer to SCSI sense buffer
* @unpacked_lun: unpacked LUN to reference for struct se_lun
* @data_length: fabric expected data transfer length
* @task_addr: SAM task attribute
* @data_dir: DMA data direction
* @flags: flags for command submission from target_sc_flags_tables
*
* Returns non zero to signal active I/O shutdown failure. All other
* setup exceptions will be returned as a SCSI CHECK_CONDITION response,
* but still return zero here.
*
* This may only be called from process context, and also currently
* assumes internal allocation of fabric payload buffer by target-core.
**/
int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
u32 data_length, int task_attr, int data_dir, int flags)
{
struct se_portal_group *se_tpg;
int rc;

se_tpg = se_sess->se_tpg;
BUG_ON(!se_tpg);
BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
BUG_ON(in_interrupt());
/*
* Initialize se_cmd for target operation. From this point
* exceptions are handled by sending exception status via
* target_core_fabric_ops->queue_status() callback
*/
transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
data_length, data_dir, task_attr, sense);
if (flags & TARGET_SCF_UNKNOWN_SIZE)
se_cmd->unknown_data_length = 1;
/*
* Obtain struct se_cmd->cmd_kref reference and add new cmd to
* se_sess->sess_cmd_list. A second kref_get here is necessary
* for fabrics using TARGET_SCF_ACK_KREF that expect a second
* kref_put() to happen during fabric packet acknowledgement.
*/
rc = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
if (rc)
return rc;
/*
* Signal bidirectional data payloads to target-core
*/
if (flags & TARGET_SCF_BIDI_OP)
se_cmd->se_cmd_flags |= SCF_BIDI;
/*
* Locate se_lun pointer and attach it to struct se_cmd
*/
if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
transport_send_check_condition_and_sense(se_cmd,
se_cmd->scsi_sense_reason, 0);
target_put_sess_cmd(se_sess, se_cmd);
return 0;
}

rc = target_setup_cmd_from_cdb(se_cmd, cdb);
if (rc != 0) {
transport_generic_request_failure(se_cmd);
return 0;
}

/*
* Check if we need to delay processing because of ALUA
* Active/NonOptimized primary access state..
*/
core_alua_check_nonop_delay(se_cmd);

transport_handle_cdb_direct(se_cmd);
return 0;
}
EXPORT_SYMBOL(target_submit_cmd);

static void target_complete_tmr_failure(struct work_struct *work)
{
struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);

se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
se_cmd->se_tfo->queue_tm_rsp(se_cmd);
transport_generic_free_cmd(se_cmd, 0);
}

/**
* target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
* for TMR CDBs
*
* @se_cmd: command descriptor to submit
* @se_sess: associated se_sess for endpoint
* @sense: pointer to SCSI sense buffer
* @unpacked_lun: unpacked LUN to reference for struct se_lun
* @fabric_context: fabric context for TMR req
* @tm_type: Type of TM request
* @gfp: gfp type for caller
* @tag: referenced task tag for TMR_ABORT_TASK
* @flags: submit cmd flags
*
* Callable from all contexts.
**/

int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
unsigned char *sense, u32 unpacked_lun,
void *fabric_tmr_ptr, unsigned char tm_type,
gfp_t gfp, unsigned int tag, int flags)
{
struct se_portal_group *se_tpg;
int ret;

se_tpg = se_sess->se_tpg;
BUG_ON(!se_tpg);

transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
0, DMA_NONE, MSG_SIMPLE_TAG, sense);
/*
* FIXME: Currently expect caller to handle se_cmd->se_tmr_req
* allocation failure.
*/
ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
if (ret < 0)
return -ENOMEM;

if (tm_type == TMR_ABORT_TASK)
se_cmd->se_tmr_req->ref_task_tag = tag;

/* See target_submit_cmd for commentary */
ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
if (ret) {
core_tmr_release_req(se_cmd->se_tmr_req);
return ret;
}

ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
if (ret) {
/*
* For callback during failure handling, push this work off
* to process context with TMR_LUN_DOES_NOT_EXIST status.
*/
INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
schedule_work(&se_cmd->work);
return 0;
}
transport_generic_handle_tmr(se_cmd);
return 0;
}
EXPORT_SYMBOL(target_submit_tmr);

/*
* If the cmd is active, request it to be stopped and sleep until it
* has completed.
*/
bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
{
bool was_active = false;

if (cmd->transport_state & CMD_T_BUSY) {
cmd->transport_state |= CMD_T_REQUEST_STOP;
spin_unlock_irqrestore(&cmd->t_state_lock, *flags);

pr_debug("cmd %p waiting to complete\n", cmd);
wait_for_completion(&cmd->task_stop_comp);
pr_debug("cmd %p stopped successfully\n", cmd);

spin_lock_irqsave(&cmd->t_state_lock, *flags);
cmd->transport_state &= ~CMD_T_REQUEST_STOP;
cmd->transport_state &= ~CMD_T_BUSY;
was_active = true;
}

return was_active;
}

/*
* Handle SAM-esque emulation for generic transport request failures.
*/
void transport_generic_request_failure(struct se_cmd *cmd)
{
int ret = 0;

pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
" CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
cmd->t_task_cdb[0]);
pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
cmd->se_tfo->get_cmd_state(cmd),
cmd->t_state, cmd->scsi_sense_reason);
pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
(cmd->transport_state & CMD_T_ACTIVE) != 0,
(cmd->transport_state & CMD_T_STOP) != 0,
(cmd->transport_state & CMD_T_SENT) != 0);

/*
* For SAM Task Attribute emulation for failed struct se_cmd
*/
if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
transport_complete_task_attr(cmd);

switch (cmd->scsi_sense_reason) {
case TCM_NON_EXISTENT_LUN:
case TCM_UNSUPPORTED_SCSI_OPCODE:
case TCM_INVALID_CDB_FIELD:
case TCM_INVALID_PARAMETER_LIST:
case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
case TCM_UNKNOWN_MODE_PAGE:
case TCM_WRITE_PROTECTED:
case TCM_ADDRESS_OUT_OF_RANGE:
case TCM_CHECK_CONDITION_ABORT_CMD:
case TCM_CHECK_CONDITION_UNIT_ATTENTION:
case TCM_CHECK_CONDITION_NOT_READY:
break;
case TCM_RESERVATION_CONFLICT:
/*
* No SENSE Data payload for this case, set SCSI Status
* and queue the response to $FABRIC_MOD.
*
* Uses linux/include/scsi/scsi.h SAM status codes defs
*/
cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
/*
* For UA Interlock Code 11b, a RESERVATION CONFLICT will
* establish a UNIT ATTENTION with PREVIOUS RESERVATION
* CONFLICT STATUS.
*
* See spc4r17, section 7.4.6 Control Mode Page, Table 349
*/
if (cmd->se_sess &&
cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
cmd->orig_fe_lun, 0x2C,
ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);

ret = cmd->se_tfo->queue_status(cmd);
if (ret == -EAGAIN || ret == -ENOMEM)
goto queue_full;
goto check_stop;
default:
pr_err("Unknown transport error for CDB 0x%02x: %d\n",
cmd->t_task_cdb[0], cmd->scsi_sense_reason);
cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
break;
}

ret = transport_send_check_condition_and_sense(cmd,
cmd->scsi_sense_reason, 0);
if (ret == -EAGAIN || ret == -ENOMEM)
goto queue_full;

check_stop:
transport_lun_remove_cmd(cmd);
if (!transport_cmd_check_stop_to_fabric(cmd))
;
return;

queue_full:
cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
transport_handle_queue_full(cmd, cmd->se_dev);
}
EXPORT_SYMBOL(transport_generic_request_failure);

static void __target_execute_cmd(struct se_cmd *cmd)
{
int error = 0;

spin_lock_irq(&cmd->t_state_lock);
cmd->transport_state |= (CMD_T_BUSY|CMD_T_SENT);
spin_unlock_irq(&cmd->t_state_lock);

if (cmd->execute_cmd)
error = cmd->execute_cmd(cmd);

if (error) {
spin_lock_irq(&cmd->t_state_lock);
cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
spin_unlock_irq(&cmd->t_state_lock);

transport_generic_request_failure(cmd);
}
}

void target_execute_cmd(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;

/*
* If the received CDB has aleady been aborted stop processing it here.
*/
if (transport_check_aborted_status(cmd, 1))
return;

/*
* Determine if IOCTL context caller in requesting the stopping of this
* command for LUN shutdown purposes.
*/
spin_lock_irq(&cmd->t_state_lock);
if (cmd->transport_state & CMD_T_LUN_STOP) {
pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
__func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));

cmd->transport_state &= ~CMD_T_ACTIVE;
spin_unlock_irq(&cmd->t_state_lock);
complete(&cmd->transport_lun_stop_comp);
return;
}
/*
* Determine if frontend context caller is requesting the stopping of
* this command for frontend exceptions.
*/
if (cmd->transport_state & CMD_T_STOP) {
pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
__func__, __LINE__,
cmd->se_tfo->get_task_tag(cmd));

spin_unlock_irq(&cmd->t_state_lock);
complete(&cmd->t_transport_stop_comp);
return;
}

cmd->t_state = TRANSPORT_PROCESSING;
spin_unlock_irq(&cmd->t_state_lock);

if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
goto execute;

/*
* Check for the existence of HEAD_OF_QUEUE, and if true return 1
* to allow the passed struct se_cmd list of tasks to the front of the list.
*/
switch (cmd->sam_task_attr) {
case MSG_HEAD_TAG:
pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
"se_ordered_id: %u\n",
cmd->t_task_cdb[0], cmd->se_ordered_id);
goto execute;
case MSG_ORDERED_TAG:
atomic_inc(&dev->dev_ordered_sync);
smp_mb__after_atomic_inc();

pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
" se_ordered_id: %u\n",
cmd->t_task_cdb[0], cmd->se_ordered_id);

/*
* Execute an ORDERED command if no other older commands
* exist that need to be completed first.
*/
if (!atomic_read(&dev->simple_cmds))
goto execute;
break;
default:
/*
* For SIMPLE and UNTAGGED Task Attribute commands
*/
atomic_inc(&dev->simple_cmds);
smp_mb__after_atomic_inc();
break;
}

if (atomic_read(&dev->dev_ordered_sync) != 0) {
spin_lock(&dev->delayed_cmd_lock);
list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
spin_unlock(&dev->delayed_cmd_lock);

pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
" delayed CMD list, se_ordered_id: %u\n",
cmd->t_task_cdb[0], cmd->sam_task_attr,
cmd->se_ordered_id);
return;
}

execute:
/*
* Otherwise, no ORDERED task attributes exist..
*/
__target_execute_cmd(cmd);
}
EXPORT_SYMBOL(target_execute_cmd);

/*
* Process all commands up to the last received ORDERED task attribute which
* requires another blocking boundary
*/
static void target_restart_delayed_cmds(struct se_device *dev)
{
for (;;) {
struct se_cmd *cmd;

spin_lock(&dev->delayed_cmd_lock);
if (list_empty(&dev->delayed_cmd_list)) {
spin_unlock(&dev->delayed_cmd_lock);
break;
}

cmd = list_entry(dev->delayed_cmd_list.next,
struct se_cmd, se_delayed_node);
list_del(&cmd->se_delayed_node);
spin_unlock(&dev->delayed_cmd_lock);

__target_execute_cmd(cmd);

if (cmd->sam_task_attr == MSG_ORDERED_TAG)
break;
}
}

/*
* Called from I/O completion to determine which dormant/delayed
* and ordered cmds need to have their tasks added to the execution queue.
*/
static void transport_complete_task_attr(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;

if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
atomic_dec(&dev->simple_cmds);
smp_mb__after_atomic_dec();
dev->dev_cur_ordered_id++;
pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
" SIMPLE: %u\n", dev->dev_cur_ordered_id,
cmd->se_ordered_id);
} else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
dev->dev_cur_ordered_id++;
pr_debug("Incremented dev_cur_ordered_id: %u for"
" HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
cmd->se_ordered_id);
} else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
atomic_dec(&dev->dev_ordered_sync);
smp_mb__after_atomic_dec();

dev->dev_cur_ordered_id++;
pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
" %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
}

target_restart_delayed_cmds(dev);
}

static void transport_complete_qf(struct se_cmd *cmd)
{
int ret = 0;

if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
transport_complete_task_attr(cmd);

if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
ret = cmd->se_tfo->queue_status(cmd);
if (ret)
goto out;
}

switch (cmd->data_direction) {
case DMA_FROM_DEVICE:
ret = cmd->se_tfo->queue_data_in(cmd);
break;
case DMA_TO_DEVICE:
if (cmd->t_bidi_data_sg) {
ret = cmd->se_tfo->queue_data_in(cmd);
if (ret < 0)
break;
}
/* Fall through for DMA_TO_DEVICE */
case DMA_NONE:
ret = cmd->se_tfo->queue_status(cmd);
break;
default:
break;
}

out:
if (ret < 0) {
transport_handle_queue_full(cmd, cmd->se_dev);
return;
}
transport_lun_remove_cmd(cmd);
transport_cmd_check_stop_to_fabric(cmd);
}

static void transport_handle_queue_full(
struct se_cmd *cmd,
struct se_device *dev)
{
spin_lock_irq(&dev->qf_cmd_lock);
list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
atomic_inc(&dev->dev_qf_count);
smp_mb__after_atomic_inc();
spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);

schedule_work(&cmd->se_dev->qf_work_queue);
}

static void target_complete_ok_work(struct work_struct *work)
{
struct se_cmd *cmd = container_of(work, struct se_cmd, work);
int ret;

/*
* Check if we need to move delayed/dormant tasks from cmds on the
* delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
* Attribute.
*/
if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
transport_complete_task_attr(cmd);
/*
* Check to schedule QUEUE_FULL work, or execute an existing
* cmd->transport_qf_callback()
*/
if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
schedule_work(&cmd->se_dev->qf_work_queue);

/*
* Check if we need to send a sense buffer from
* the struct se_cmd in question.
*/
if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
WARN_ON(!cmd->scsi_status);
ret = transport_send_check_condition_and_sense(
cmd, 0, 1);
if (ret == -EAGAIN || ret == -ENOMEM)
goto queue_full;

transport_lun_remove_cmd(cmd);
transport_cmd_check_stop_to_fabric(cmd);
return;
}
/*
* Check for a callback, used by amongst other things
* XDWRITE_READ_10 emulation.
*/
if (cmd->transport_complete_callback)
cmd->transport_complete_callback(cmd);

switch (cmd->data_direction) {
case DMA_FROM_DEVICE:
spin_lock(&cmd->se_lun->lun_sep_lock);
if (cmd->se_lun->lun_sep) {
cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
cmd->data_length;
}
spin_unlock(&cmd->se_lun->lun_sep_lock);

ret = cmd->se_tfo->queue_data_in(cmd);
if (ret == -EAGAIN || ret == -ENOMEM)
goto queue_full;
break;
case DMA_TO_DEVICE:
spin_lock(&cmd->se_lun->lun_sep_lock);
if (cmd->se_lun->lun_sep) {
cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
cmd->data_length;
}
spin_unlock(&cmd->se_lun->lun_sep_lock);
/*
* Check if we need to send READ payload for BIDI-COMMAND
*/
if (cmd->t_bidi_data_sg) {
spin_lock(&cmd->se_lun->lun_sep_lock);
if (cmd->se_lun->lun_sep) {
cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
cmd->data_length;
}
spin_unlock(&cmd->se_lun->lun_sep_lock);
ret = cmd->se_tfo->queue_data_in(cmd);
if (ret == -EAGAIN || ret == -ENOMEM)
goto queue_full;
break;
}
/* Fall through for DMA_TO_DEVICE */
case DMA_NONE:
ret = cmd->se_tfo->queue_status(cmd);
if (ret == -EAGAIN || ret == -ENOMEM)
goto queue_full;
break;
default:
break;
}

transport_lun_remove_cmd(cmd);
transport_cmd_check_stop_to_fabric(cmd);
return;

queue_full:
pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
" data_direction: %d\n", cmd, cmd->data_direction);
cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
transport_handle_queue_full(cmd, cmd->se_dev);
}

static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
{
struct scatterlist *sg;
int count;

for_each_sg(sgl, sg, nents, count)
__free_page(sg_page(sg));

kfree(sgl);
}

static inline void transport_free_pages(struct se_cmd *cmd)
{
if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
return;

transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
cmd->t_data_sg = NULL;
cmd->t_data_nents = 0;

transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
cmd->t_bidi_data_sg = NULL;
cmd->t_bidi_data_nents = 0;
}

/**
* transport_release_cmd - free a command
* @cmd: command to free
*
* This routine unconditionally frees a command, and reference counting
* or list removal must be done in the caller.
*/
static void transport_release_cmd(struct se_cmd *cmd)
{
BUG_ON(!cmd->se_tfo);

if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
core_tmr_release_req(cmd->se_tmr_req);
if (cmd->t_task_cdb != cmd->__t_task_cdb)
kfree(cmd->t_task_cdb);
/*
* If this cmd has been setup with target_get_sess_cmd(), drop
* the kref and call ->release_cmd() in kref callback.
*/
if (cmd->check_release != 0) {
target_put_sess_cmd(cmd->se_sess, cmd);
return;
}
cmd->se_tfo->release_cmd(cmd);
}

/**
* transport_put_cmd - release a reference to a command
* @cmd: command to release
*
* This routine releases our reference to the command and frees it if possible.
*/
static void transport_put_cmd(struct se_cmd *cmd)
{
unsigned long flags;

spin_lock_irqsave(&cmd->t_state_lock, flags);
if (atomic_read(&cmd->t_fe_count)) {
if (!atomic_dec_and_test(&cmd->t_fe_count))
goto out_busy;
}

if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
target_remove_from_state_list(cmd);
}
spin_unlock_irqrestore(&cmd->t_state_lock, flags);

transport_free_pages(cmd);
transport_release_cmd(cmd);
return;
out_busy:
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
}

/*
* transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
* allocating in the core.
* @cmd: Associated se_cmd descriptor
* @mem: SGL style memory for TCM WRITE / READ
* @sg_mem_num: Number of SGL elements
* @mem_bidi_in: SGL style memory for TCM BIDI READ
* @sg_mem_bidi_num: Number of BIDI READ SGL elements
*
* Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
* of parameters.
*/
int transport_generic_map_mem_to_cmd(
struct se_cmd *cmd,
struct scatterlist *sgl,
u32 sgl_count,
struct scatterlist *sgl_bidi,
u32 sgl_bidi_count)
{
if (!sgl || !sgl_count)
return 0;

/*
* Reject SCSI data overflow with map_mem_to_cmd() as incoming
* scatterlists already have been set to follow what the fabric
* passes for the original expected data transfer length.
*/
if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
pr_warn("Rejecting SCSI DATA overflow for fabric using"
" SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
return -EINVAL;
}

cmd->t_data_sg = sgl;
cmd->t_data_nents = sgl_count;

if (sgl_bidi && sgl_bidi_count) {
cmd->t_bidi_data_sg = sgl_bidi;
cmd->t_bidi_data_nents = sgl_bidi_count;
}
cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
return 0;
}
EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);

void *transport_kmap_data_sg(struct se_cmd *cmd)
{
struct scatterlist *sg = cmd->t_data_sg;
struct page **pages;
int i;

/*
* We need to take into account a possible offset here for fabrics like
* tcm_loop who may be using a contig buffer from the SCSI midlayer for
* control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
*/
if (!cmd->t_data_nents)
return NULL;

BUG_ON(!sg);
if (cmd->t_data_nents == 1)
return kmap(sg_page(sg)) + sg->offset;

/* >1 page. use vmap */
pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
if (!pages) {
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return NULL;
}

/* convert sg[] to pages[] */
for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
pages[i] = sg_page(sg);
}

cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
kfree(pages);
if (!cmd->t_data_vmap) {
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return NULL;
}

return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
}
EXPORT_SYMBOL(transport_kmap_data_sg);

void transport_kunmap_data_sg(struct se_cmd *cmd)
{
if (!cmd->t_data_nents) {
return;
} else if (cmd->t_data_nents == 1) {
kunmap(sg_page(cmd->t_data_sg));
return;
}

vunmap(cmd->t_data_vmap);
cmd->t_data_vmap = NULL;
}
EXPORT_SYMBOL(transport_kunmap_data_sg);

static int
transport_generic_get_mem(struct se_cmd *cmd)
{
u32 length = cmd->data_length;
unsigned int nents;
struct page *page;
gfp_t zero_flag;
int i = 0;

nents = DIV_ROUND_UP(length, PAGE_SIZE);
cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
if (!cmd->t_data_sg)
return -ENOMEM;

cmd->t_data_nents = nents;
sg_init_table(cmd->t_data_sg, nents);

zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_CDB ? 0 : __GFP_ZERO;

while (length) {
u32 page_len = min_t(u32, length, PAGE_SIZE);
page = alloc_page(GFP_KERNEL | zero_flag);
if (!page)
goto out;

sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
length -= page_len;
i++;
}
return 0;

out:
while (i > 0) {
i--;
__free_page(sg_page(&cmd->t_data_sg[i]));
}
kfree(cmd->t_data_sg);
cmd->t_data_sg = NULL;
return -ENOMEM;
}

/*
* Allocate any required resources to execute the command. For writes we
* might not have the payload yet, so notify the fabric via a call to
* ->write_pending instead. Otherwise place it on the execution queue.
*/
int transport_generic_new_cmd(struct se_cmd *cmd)
{
int ret = 0;

/*
* Determine is the TCM fabric module has already allocated physical
* memory, and is directly calling transport_generic_map_mem_to_cmd()
* beforehand.
*/
if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
cmd->data_length) {
ret = transport_generic_get_mem(cmd);
if (ret < 0)
goto out_fail;
}
/*
* If this command doesn't have any payload and we don't have to call
* into the fabric for data transfers, go ahead and complete it right
* away.
*/
if (!cmd->data_length &&
cmd->t_task_cdb[0] != REQUEST_SENSE &&
cmd->se_dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
spin_lock_irq(&cmd->t_state_lock);
cmd->t_state = TRANSPORT_COMPLETE;
cmd->transport_state |= CMD_T_ACTIVE;
spin_unlock_irq(&cmd->t_state_lock);

INIT_WORK(&cmd->work, target_complete_ok_work);
queue_work(target_completion_wq, &cmd->work);
return 0;
}

atomic_inc(&cmd->t_fe_count);

/*
* If this command is not a write we can execute it right here,
* for write buffers we need to notify the fabric driver first
* and let it call back once the write buffers are ready.
*/
target_add_to_state_list(cmd);
if (cmd->data_direction != DMA_TO_DEVICE) {
target_execute_cmd(cmd);
return 0;
}

spin_lock_irq(&cmd->t_state_lock);
cmd->t_state = TRANSPORT_WRITE_PENDING;
spin_unlock_irq(&cmd->t_state_lock);

transport_cmd_check_stop(cmd, false);

ret = cmd->se_tfo->write_pending(cmd);
if (ret == -EAGAIN || ret == -ENOMEM)
goto queue_full;

if (ret < 0)
return ret;
return 1;

out_fail:
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
queue_full:
pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
transport_handle_queue_full(cmd, cmd->se_dev);
return 0;
}
EXPORT_SYMBOL(transport_generic_new_cmd);

static void transport_write_pending_qf(struct se_cmd *cmd)
{
int ret;

ret = cmd->se_tfo->write_pending(cmd);
if (ret == -EAGAIN || ret == -ENOMEM) {
pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
cmd);
transport_handle_queue_full(cmd, cmd->se_dev);
}
}

void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
{
if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
transport_wait_for_tasks(cmd);

transport_release_cmd(cmd);
} else {
if (wait_for_tasks)
transport_wait_for_tasks(cmd);

core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);

if (cmd->se_lun)
transport_lun_remove_cmd(cmd);

transport_put_cmd(cmd);
}
}
EXPORT_SYMBOL(transport_generic_free_cmd);

/* target_get_sess_cmd - Add command to active ->sess_cmd_list
* @se_sess: session to reference
* @se_cmd: command descriptor to add
* @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
*/
static int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
bool ack_kref)
{
unsigned long flags;
int ret = 0;

kref_init(&se_cmd->cmd_kref);
/*
* Add a second kref if the fabric caller is expecting to handle
* fabric acknowledgement that requires two target_put_sess_cmd()
* invocations before se_cmd descriptor release.
*/
if (ack_kref == true) {
kref_get(&se_cmd->cmd_kref);
se_cmd->se_cmd_flags |= SCF_ACK_KREF;
}

spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
if (se_sess->sess_tearing_down) {
ret = -ESHUTDOWN;
goto out;
}
list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
se_cmd->check_release = 1;

out:
spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
return ret;
}

static void target_release_cmd_kref(struct kref *kref)
{
struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
struct se_session *se_sess = se_cmd->se_sess;
unsigned long flags;

spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
if (list_empty(&se_cmd->se_cmd_list)) {
spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
se_cmd->se_tfo->release_cmd(se_cmd);
return;
}
if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
complete(&se_cmd->cmd_wait_comp);
return;
}
list_del(&se_cmd->se_cmd_list);
spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);

se_cmd->se_tfo->release_cmd(se_cmd);
}

/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
* @se_sess: session to reference
* @se_cmd: command descriptor to drop
*/
int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
{
return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
}
EXPORT_SYMBOL(target_put_sess_cmd);

/* target_sess_cmd_list_set_waiting - Flag all commands in
* sess_cmd_list to complete cmd_wait_comp. Set
* sess_tearing_down so no more commands are queued.
* @se_sess: session to flag
*/
void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
{
struct se_cmd *se_cmd;
unsigned long flags;

spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);

WARN_ON(se_sess->sess_tearing_down);
se_sess->sess_tearing_down = 1;

list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list)
se_cmd->cmd_wait_set = 1;

spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
}
EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);

/* target_wait_for_sess_cmds - Wait for outstanding descriptors
* @se_sess: session to wait for active I/O
* @wait_for_tasks: Make extra transport_wait_for_tasks call
*/
void target_wait_for_sess_cmds(
struct se_session *se_sess,
int wait_for_tasks)
{
struct se_cmd *se_cmd, *tmp_cmd;
bool rc = false;

list_for_each_entry_safe(se_cmd, tmp_cmd,
&se_sess->sess_cmd_list, se_cmd_list) {
list_del(&se_cmd->se_cmd_list);

pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
" %d\n", se_cmd, se_cmd->t_state,
se_cmd->se_tfo->get_cmd_state(se_cmd));

if (wait_for_tasks) {
pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
" fabric state: %d\n", se_cmd, se_cmd->t_state,
se_cmd->se_tfo->get_cmd_state(se_cmd));

rc = transport_wait_for_tasks(se_cmd);

pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
" fabric state: %d\n", se_cmd, se_cmd->t_state,
se_cmd->se_tfo->get_cmd_state(se_cmd));
}

if (!rc) {
wait_for_completion(&se_cmd->cmd_wait_comp);
pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
" fabric state: %d\n", se_cmd, se_cmd->t_state,
se_cmd->se_tfo->get_cmd_state(se_cmd));
}

se_cmd->se_tfo->release_cmd(se_cmd);
}
}
EXPORT_SYMBOL(target_wait_for_sess_cmds);

/* transport_lun_wait_for_tasks():
*
* Called from ConfigFS context to stop the passed struct se_cmd to allow
* an struct se_lun to be successfully shutdown.
*/
static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
{
unsigned long flags;
int ret = 0;

/*
* If the frontend has already requested this struct se_cmd to
* be stopped, we can safely ignore this struct se_cmd.
*/
spin_lock_irqsave(&cmd->t_state_lock, flags);
if (cmd->transport_state & CMD_T_STOP) {
cmd->transport_state &= ~CMD_T_LUN_STOP;

pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
cmd->se_tfo->get_task_tag(cmd));
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
transport_cmd_check_stop(cmd, false);
return -EPERM;
}
cmd->transport_state |= CMD_T_LUN_FE_STOP;
spin_unlock_irqrestore(&cmd->t_state_lock, flags);

// XXX: audit task_flags checks.
spin_lock_irqsave(&cmd->t_state_lock, flags);
if ((cmd->transport_state & CMD_T_BUSY) &&
(cmd->transport_state & CMD_T_SENT)) {
if (!target_stop_cmd(cmd, &flags))
ret++;
}
spin_unlock_irqrestore(&cmd->t_state_lock, flags);

pr_debug("ConfigFS: cmd: %p stop tasks ret:"
" %d\n", cmd, ret);
if (!ret) {
pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
cmd->se_tfo->get_task_tag(cmd));
wait_for_completion(&cmd->transport_lun_stop_comp);
pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
cmd->se_tfo->get_task_tag(cmd));
}

return 0;
}

static void __transport_clear_lun_from_sessions(struct se_lun *lun)
{
struct se_cmd *cmd = NULL;
unsigned long lun_flags, cmd_flags;
/*
* Do exception processing and return CHECK_CONDITION status to the
* Initiator Port.
*/
spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
while (!list_empty(&lun->lun_cmd_list)) {
cmd = list_first_entry(&lun->lun_cmd_list,
struct se_cmd, se_lun_node);
list_del_init(&cmd->se_lun_node);

spin_lock(&cmd->t_state_lock);
pr_debug("SE_LUN[%d] - Setting cmd->transport"
"_lun_stop for ITT: 0x%08x\n",
cmd->se_lun->unpacked_lun,
cmd->se_tfo->get_task_tag(cmd));
cmd->transport_state |= CMD_T_LUN_STOP;
spin_unlock(&cmd->t_state_lock);

spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);

if (!cmd->se_lun) {
pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
cmd->se_tfo->get_task_tag(cmd),
cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
BUG();
}
/*
* If the Storage engine still owns the iscsi_cmd_t, determine
* and/or stop its context.
*/
pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
"_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
cmd->se_tfo->get_task_tag(cmd));

if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {