blob: 89760329d5d0d292c0c8648c8aff16495a1822b4 [file] [log] [blame]
/*******************************************************************************
* 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/version.h>
#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 <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_device.h>
#include <target/target_core_tmr.h>
#include <target/target_core_tpg.h>
#include <target/target_core_transport.h>
#include <target/target_core_fabric_ops.h>
#include <target/target_core_configfs.h>
#include "target_core_alua.h"
#include "target_core_hba.h"
#include "target_core_pr.h"
#include "target_core_scdb.h"
#include "target_core_ua.h"
static int sub_api_initialized;
static struct kmem_cache *se_cmd_cache;
static struct kmem_cache *se_sess_cache;
struct kmem_cache *se_tmr_req_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;
/* Used for transport_dev_get_map_*() */
typedef int (*map_func_t)(struct se_task *, u32);
static int transport_generic_write_pending(struct se_cmd *);
static int transport_processing_thread(void *param);
static int __transport_execute_tasks(struct se_device *dev);
static void transport_complete_task_attr(struct se_cmd *cmd);
static int transport_complete_qf(struct se_cmd *cmd);
static void transport_handle_queue_full(struct se_cmd *cmd,
struct se_device *dev, int (*qf_callback)(struct se_cmd *));
static void transport_direct_request_timeout(struct se_cmd *cmd);
static void transport_free_dev_tasks(struct se_cmd *cmd);
static u32 transport_allocate_tasks(struct se_cmd *cmd,
unsigned long long starting_lba,
enum dma_data_direction data_direction,
struct scatterlist *sgl, unsigned int nents);
static int transport_generic_get_mem(struct se_cmd *cmd);
static int transport_generic_remove(struct se_cmd *cmd,
int session_reinstatement);
static void transport_release_fe_cmd(struct se_cmd *cmd);
static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
struct se_queue_obj *qobj);
static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
static void transport_stop_all_task_timers(struct se_cmd *cmd);
int init_se_kmem_caches(void)
{
se_cmd_cache = kmem_cache_create("se_cmd_cache",
sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
if (!se_cmd_cache) {
pr_err("kmem_cache_create for struct se_cmd failed\n");
goto out;
}
se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
0, NULL);
if (!se_tmr_req_cache) {
pr_err("kmem_cache_create() for struct se_tmr_req"
" failed\n");
goto out;
}
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;
}
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;
}
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;
}
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;
}
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;
}
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;
}
return 0;
out:
if (se_cmd_cache)
kmem_cache_destroy(se_cmd_cache);
if (se_tmr_req_cache)
kmem_cache_destroy(se_tmr_req_cache);
if (se_sess_cache)
kmem_cache_destroy(se_sess_cache);
if (se_ua_cache)
kmem_cache_destroy(se_ua_cache);
if (t10_pr_reg_cache)
kmem_cache_destroy(t10_pr_reg_cache);
if (t10_alua_lu_gp_cache)
kmem_cache_destroy(t10_alua_lu_gp_cache);
if (t10_alua_lu_gp_mem_cache)
kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
if (t10_alua_tg_pt_gp_cache)
kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
if (t10_alua_tg_pt_gp_mem_cache)
kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
return -ENOMEM;
}
void release_se_kmem_caches(void)
{
kmem_cache_destroy(se_cmd_cache);
kmem_cache_destroy(se_tmr_req_cache);
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_init_queue_obj(struct se_queue_obj *qobj)
{
atomic_set(&qobj->queue_cnt, 0);
INIT_LIST_HEAD(&qobj->qobj_list);
init_waitqueue_head(&qobj->thread_wq);
spin_lock_init(&qobj->cmd_queue_lock);
}
EXPORT_SYMBOL(transport_init_queue_obj);
static int transport_subsystem_reqmods(void)
{
int ret;
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");
return 0;
}
int transport_subsystem_check_init(void)
{
int ret;
if (sub_api_initialized)
return 0;
/*
* Request the loading of known TCM subsystem plugins..
*/
ret = transport_subsystem_reqmods();
if (ret < 0)
return ret;
sub_api_initialized = 1;
return 0;
}
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);
return se_sess;
}
EXPORT_SYMBOL(transport_init_session);
/*
* Called with spin_lock_bh(&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]);
}
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)
{
spin_lock_bh(&se_tpg->session_lock);
__transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
spin_unlock_bh(&se_tpg->session_lock);
}
EXPORT_SYMBOL(transport_register_session);
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);
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 se_node_acl *se_nacl;
if (!se_tpg) {
transport_free_session(se_sess);
return;
}
spin_lock_bh(&se_tpg->session_lock);
list_del(&se_sess->sess_list);
se_sess->se_tpg = NULL;
se_sess->fabric_sess_ptr = NULL;
spin_unlock_bh(&se_tpg->session_lock);
/*
* 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;
if (se_nacl) {
spin_lock_bh(&se_tpg->acl_node_lock);
if (se_nacl->dynamic_node_acl) {
if (!se_tpg->se_tpg_tfo->tpg_check_demo_mode_cache(
se_tpg)) {
list_del(&se_nacl->acl_list);
se_tpg->num_node_acls--;
spin_unlock_bh(&se_tpg->acl_node_lock);
core_tpg_wait_for_nacl_pr_ref(se_nacl);
core_free_device_list_for_node(se_nacl, se_tpg);
se_tpg->se_tpg_tfo->tpg_release_fabric_acl(se_tpg,
se_nacl);
spin_lock_bh(&se_tpg->acl_node_lock);
}
}
spin_unlock_bh(&se_tpg->acl_node_lock);
}
transport_free_session(se_sess);
pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
se_tpg->se_tpg_tfo->get_fabric_name());
}
EXPORT_SYMBOL(transport_deregister_session);
/*
* Called with cmd->t_state_lock held.
*/
static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
{
struct se_device *dev;
struct se_task *task;
unsigned long flags;
list_for_each_entry(task, &cmd->t_task_list, t_list) {
dev = task->se_dev;
if (!dev)
continue;
if (atomic_read(&task->task_active))
continue;
if (!atomic_read(&task->task_state_active))
continue;
spin_lock_irqsave(&dev->execute_task_lock, flags);
list_del(&task->t_state_list);
pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
cmd->se_tfo->get_task_tag(cmd), dev, task);
spin_unlock_irqrestore(&dev->execute_task_lock, flags);
atomic_set(&task->task_state_active, 0);
atomic_dec(&cmd->t_task_cdbs_ex_left);
}
}
/* transport_cmd_check_stop():
*
* 'transport_off = 1' determines if t_transport_active should be cleared.
* 'transport_off = 2' determines if task_dev_state should be removed.
*
* A non-zero u8 t_state sets cmd->t_state.
* Returns 1 when command is stopped, else 0.
*/
static int transport_cmd_check_stop(
struct se_cmd *cmd,
int transport_off,
u8 t_state)
{
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 (atomic_read(&cmd->transport_lun_stop)) {
pr_debug("%s:%d atomic_read(&cmd->transport_lun_stop)"
" == TRUE for ITT: 0x%08x\n", __func__, __LINE__,
cmd->se_tfo->get_task_tag(cmd));
cmd->deferred_t_state = cmd->t_state;
cmd->t_state = TRANSPORT_DEFERRED_CMD;
atomic_set(&cmd->t_transport_active, 0);
if (transport_off == 2)
transport_all_task_dev_remove_state(cmd);
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
complete(&cmd->transport_lun_stop_comp);
return 1;
}
/*
* Determine if frontend context caller is requesting the stopping of
* this command for frontend exceptions.
*/
if (atomic_read(&cmd->t_transport_stop)) {
pr_debug("%s:%d atomic_read(&cmd->t_transport_stop) =="
" TRUE for ITT: 0x%08x\n", __func__, __LINE__,
cmd->se_tfo->get_task_tag(cmd));
cmd->deferred_t_state = cmd->t_state;
cmd->t_state = TRANSPORT_DEFERRED_CMD;
if (transport_off == 2)
transport_all_task_dev_remove_state(cmd);
/*
* Clear struct se_cmd->se_lun before the transport_off == 2 handoff
* to FE.
*/
if (transport_off == 2)
cmd->se_lun = NULL;
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
complete(&cmd->t_transport_stop_comp);
return 1;
}
if (transport_off) {
atomic_set(&cmd->t_transport_active, 0);
if (transport_off == 2) {
transport_all_task_dev_remove_state(cmd);
/*
* Clear struct se_cmd->se_lun before the transport_off == 2
* handoff to fabric module.
*/
cmd->se_lun = NULL;
/*
* Some fabric modules like tcm_loop can release
* their internally allocated I/O reference now and
* struct se_cmd now.
*/
if (cmd->se_tfo->check_stop_free != NULL) {
spin_unlock_irqrestore(
&cmd->t_state_lock, flags);
cmd->se_tfo->check_stop_free(cmd);
return 1;
}
}
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
return 0;
} else if (t_state)
cmd->t_state = t_state;
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, 2, 0);
}
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 (!atomic_read(&cmd->transport_dev_active)) {
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
goto check_lun;
}
atomic_set(&cmd->transport_dev_active, 0);
transport_all_task_dev_remove_state(cmd);
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
check_lun:
spin_lock_irqsave(&lun->lun_cmd_lock, flags);
if (atomic_read(&cmd->transport_lun_active)) {
list_del(&cmd->se_lun_node);
atomic_set(&cmd->transport_lun_active, 0);
#if 0
pr_debug("Removed ITT: 0x%08x from LUN LIST[%d]\n"
cmd->se_tfo->get_task_tag(cmd), lun->unpacked_lun);
#endif
}
spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
}
void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
{
transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
transport_lun_remove_cmd(cmd);
if (transport_cmd_check_stop_to_fabric(cmd))
return;
if (remove)
transport_generic_remove(cmd, 0);
}
void transport_cmd_finish_abort_tmr(struct se_cmd *cmd)
{
transport_remove_cmd_from_queue(cmd, &cmd->se_dev->dev_queue_obj);
if (transport_cmd_check_stop_to_fabric(cmd))
return;
transport_generic_remove(cmd, 0);
}
static void transport_add_cmd_to_queue(
struct se_cmd *cmd,
int t_state)
{
struct se_device *dev = cmd->se_dev;
struct se_queue_obj *qobj = &dev->dev_queue_obj;
unsigned long flags;
INIT_LIST_HEAD(&cmd->se_queue_node);
if (t_state) {
spin_lock_irqsave(&cmd->t_state_lock, flags);
cmd->t_state = t_state;
atomic_set(&cmd->t_transport_active, 1);
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
}
spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
if (cmd->se_cmd_flags & SCF_EMULATE_QUEUE_FULL) {
cmd->se_cmd_flags &= ~SCF_EMULATE_QUEUE_FULL;
list_add(&cmd->se_queue_node, &qobj->qobj_list);
} else
list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
atomic_inc(&cmd->t_transport_queue_active);
spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
atomic_inc(&qobj->queue_cnt);
wake_up_interruptible(&qobj->thread_wq);
}
static struct se_cmd *
transport_get_cmd_from_queue(struct se_queue_obj *qobj)
{
struct se_cmd *cmd;
unsigned long flags;
spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
if (list_empty(&qobj->qobj_list)) {
spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
return NULL;
}
cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
atomic_dec(&cmd->t_transport_queue_active);
list_del(&cmd->se_queue_node);
atomic_dec(&qobj->queue_cnt);
spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
return cmd;
}
static void transport_remove_cmd_from_queue(struct se_cmd *cmd,
struct se_queue_obj *qobj)
{
struct se_cmd *t;
unsigned long flags;
spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
if (!atomic_read(&cmd->t_transport_queue_active)) {
spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
return;
}
list_for_each_entry(t, &qobj->qobj_list, se_queue_node)
if (t == cmd) {
atomic_dec(&cmd->t_transport_queue_active);
atomic_dec(&qobj->queue_cnt);
list_del(&cmd->se_queue_node);
break;
}
spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
if (atomic_read(&cmd->t_transport_queue_active)) {
pr_err("ITT: 0x%08x t_transport_queue_active: %d\n",
cmd->se_tfo->get_task_tag(cmd),
atomic_read(&cmd->t_transport_queue_active));
}
}
/*
* Completion function used by TCM subsystem plugins (such as FILEIO)
* for queueing up response from struct se_subsystem_api->do_task()
*/
void transport_complete_sync_cache(struct se_cmd *cmd, int good)
{
struct se_task *task = list_entry(cmd->t_task_list.next,
struct se_task, t_list);
if (good) {
cmd->scsi_status = SAM_STAT_GOOD;
task->task_scsi_status = GOOD;
} else {
task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
task->task_se_cmd->transport_error_status =
PYX_TRANSPORT_ILLEGAL_REQUEST;
}
transport_complete_task(task, good);
}
EXPORT_SYMBOL(transport_complete_sync_cache);
/* transport_complete_task():
*
* Called from interrupt and non interrupt context depending
* on the transport plugin.
*/
void transport_complete_task(struct se_task *task, int success)
{
struct se_cmd *cmd = task->task_se_cmd;
struct se_device *dev = task->se_dev;
int t_state;
unsigned long flags;
#if 0
pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
cmd->t_task_cdb[0], dev);
#endif
if (dev)
atomic_inc(&dev->depth_left);
spin_lock_irqsave(&cmd->t_state_lock, flags);
atomic_set(&task->task_active, 0);
/*
* See if any sense data exists, if so set the TASK_SENSE flag.
* Also check for any other post completion work that needs to be
* done by the plugins.
*/
if (dev && dev->transport->transport_complete) {
if (dev->transport->transport_complete(task) != 0) {
cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
task->task_sense = 1;
success = 1;
}
}
/*
* See if we are waiting for outstanding struct se_task
* to complete for an exception condition
*/
if (atomic_read(&task->task_stop)) {
/*
* Decrement cmd->t_se_count if this task had
* previously thrown its timeout exception handler.
*/
if (atomic_read(&task->task_timeout)) {
atomic_dec(&cmd->t_se_count);
atomic_set(&task->task_timeout, 0);
}
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
complete(&task->task_stop_comp);
return;
}
/*
* If the task's timeout handler has fired, use the t_task_cdbs_timeout
* left counter to determine when the struct se_cmd is ready to be queued to
* the processing thread.
*/
if (atomic_read(&task->task_timeout)) {
if (!atomic_dec_and_test(
&cmd->t_task_cdbs_timeout_left)) {
spin_unlock_irqrestore(&cmd->t_state_lock,
flags);
return;
}
t_state = TRANSPORT_COMPLETE_TIMEOUT;
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
transport_add_cmd_to_queue(cmd, t_state);
return;
}
atomic_dec(&cmd->t_task_cdbs_timeout_left);
/*
* Decrement the outstanding t_task_cdbs_left count. The last
* struct se_task from struct se_cmd will complete itself into the
* device queue depending upon int success.
*/
if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
if (!success)
cmd->t_tasks_failed = 1;
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
return;
}
if (!success || cmd->t_tasks_failed) {
t_state = TRANSPORT_COMPLETE_FAILURE;
if (!task->task_error_status) {
task->task_error_status =
PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
cmd->transport_error_status =
PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
}
} else {
atomic_set(&cmd->t_transport_complete, 1);
t_state = TRANSPORT_COMPLETE_OK;
}
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
transport_add_cmd_to_queue(cmd, t_state);
}
EXPORT_SYMBOL(transport_complete_task);
/*
* Called by transport_add_tasks_from_cmd() once a struct se_cmd's
* struct se_task list are ready to be added to the active execution list
* struct se_device
* Called with se_dev_t->execute_task_lock called.
*/
static inline int transport_add_task_check_sam_attr(
struct se_task *task,
struct se_task *task_prev,
struct se_device *dev)
{
/*
* No SAM Task attribute emulation enabled, add to tail of
* execution queue
*/
if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
list_add_tail(&task->t_execute_list, &dev->execute_task_list);
return 0;
}
/*
* HEAD_OF_QUEUE attribute for received CDB, which means
* the first task that is associated with a struct se_cmd goes to
* head of the struct se_device->execute_task_list, and task_prev
* after that for each subsequent task
*/
if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
list_add(&task->t_execute_list,
(task_prev != NULL) ?
&task_prev->t_execute_list :
&dev->execute_task_list);
pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
" in execution queue\n",
task->task_se_cmd->t_task_cdb[0]);
return 1;
}
/*
* For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
* transitioned from Dermant -> Active state, and are added to the end
* of the struct se_device->execute_task_list
*/
list_add_tail(&task->t_execute_list, &dev->execute_task_list);
return 0;
}
/* __transport_add_task_to_execute_queue():
*
* Called with se_dev_t->execute_task_lock called.
*/
static void __transport_add_task_to_execute_queue(
struct se_task *task,
struct se_task *task_prev,
struct se_device *dev)
{
int head_of_queue;
head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
atomic_inc(&dev->execute_tasks);
if (atomic_read(&task->task_state_active))
return;
/*
* Determine if this task needs to go to HEAD_OF_QUEUE for the
* state list as well. Running with SAM Task Attribute emulation
* will always return head_of_queue == 0 here
*/
if (head_of_queue)
list_add(&task->t_state_list, (task_prev) ?
&task_prev->t_state_list :
&dev->state_task_list);
else
list_add_tail(&task->t_state_list, &dev->state_task_list);
atomic_set(&task->task_state_active, 1);
pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
task, dev);
}
static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
{
struct se_device *dev;
struct se_task *task;
unsigned long flags;
spin_lock_irqsave(&cmd->t_state_lock, flags);
list_for_each_entry(task, &cmd->t_task_list, t_list) {
dev = task->se_dev;
if (atomic_read(&task->task_state_active))
continue;
spin_lock(&dev->execute_task_lock);
list_add_tail(&task->t_state_list, &dev->state_task_list);
atomic_set(&task->task_state_active, 1);
pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
task->task_se_cmd->se_tfo->get_task_tag(
task->task_se_cmd), task, dev);
spin_unlock(&dev->execute_task_lock);
}
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
}
static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
struct se_task *task, *task_prev = NULL;
unsigned long flags;
spin_lock_irqsave(&dev->execute_task_lock, flags);
list_for_each_entry(task, &cmd->t_task_list, t_list) {
if (atomic_read(&task->task_execute_queue))
continue;
/*
* __transport_add_task_to_execute_queue() handles the
* SAM Task Attribute emulation if enabled
*/
__transport_add_task_to_execute_queue(task, task_prev, dev);
atomic_set(&task->task_execute_queue, 1);
task_prev = task;
}
spin_unlock_irqrestore(&dev->execute_task_lock, flags);
}
/* transport_remove_task_from_execute_queue():
*
*
*/
void transport_remove_task_from_execute_queue(
struct se_task *task,
struct se_device *dev)
{
unsigned long flags;
if (atomic_read(&task->task_execute_queue) == 0) {
dump_stack();
return;
}
spin_lock_irqsave(&dev->execute_task_lock, flags);
list_del(&task->t_execute_list);
atomic_set(&task->task_execute_queue, 0);
atomic_dec(&dev->execute_tasks);
spin_unlock_irqrestore(&dev->execute_task_lock, flags);
}
/*
* Handle QUEUE_FULL / -EAGAIN status
*/
static void target_qf_do_work(struct work_struct *work)
{
struct se_device *dev = container_of(work, struct se_device,
qf_work_queue);
struct se_cmd *cmd, *cmd_tmp;
spin_lock_irq(&dev->qf_cmd_lock);
list_for_each_entry_safe(cmd, cmd_tmp, &dev->qf_cmd_list, se_qf_node) {
list_del(&cmd->se_qf_node);
atomic_dec(&dev->dev_qf_count);
smp_mb__after_atomic_dec();
spin_unlock_irq(&dev->qf_cmd_lock);
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_OK) ? "COMPLETE_OK" :
(cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
: "UNKNOWN");
/*
* The SCF_EMULATE_QUEUE_FULL flag will be cleared once se_cmd
* has been added to head of queue
*/
transport_add_cmd_to_queue(cmd, cmd->t_state);
spin_lock_irq(&dev->qf_cmd_lock);
}
spin_unlock_irq(&dev->qf_cmd_lock);
}
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, " Execute/Left/Max Queue Depth: %d/%d/%d",
atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
dev->queue_depth);
*bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
*bl += sprintf(b + *bl, " ");
}
/* transport_release_all_cmds():
*
*
*/
static void transport_release_all_cmds(struct se_device *dev)
{
struct se_cmd *cmd, *tcmd;
int bug_out = 0, t_state;
unsigned long flags;
spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
list_for_each_entry_safe(cmd, tcmd, &dev->dev_queue_obj.qobj_list,
se_queue_node) {
t_state = cmd->t_state;
list_del(&cmd->se_queue_node);
spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock,
flags);
pr_err("Releasing ITT: 0x%08x, i_state: %u,"
" t_state: %u directly\n",
cmd->se_tfo->get_task_tag(cmd),
cmd->se_tfo->get_cmd_state(cmd), t_state);
transport_release_fe_cmd(cmd);
bug_out = 1;
spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
}
spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock, flags);
#if 0
if (bug_out)
BUG();
#endif
}
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;
int i, device_type;
/*
* Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
*/
pr_debug(" Vendor: ");
for (i = 0; i < 8; i++)
if (wwn->vendor[i] >= 0x20)
pr_debug("%c", wwn->vendor[i]);
else
pr_debug(" ");
pr_debug(" Model: ");
for (i = 0; i < 16; i++)
if (wwn->model[i] >= 0x20)
pr_debug("%c", wwn->model[i]);
else
pr_debug(" ");
pr_debug(" Revision: ");
for (i = 0; i < 4; i++)
if (wwn->revision[i] >= 0x20)
pr_debug("%c", wwn->revision[i]);
else
pr_debug(" ");
pr_debug("\n");
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;
}
transport_init_queue_obj(&dev->dev_queue_obj);
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;
atomic_set(&dev->active_cmds, 0);
INIT_LIST_HEAD(&dev->dev_list);
INIT_LIST_HEAD(&dev->dev_sep_list);
INIT_LIST_HEAD(&dev->dev_tmr_list);
INIT_LIST_HEAD(&dev->execute_task_list);
INIT_LIST_HEAD(&dev->delayed_cmd_list);
INIT_LIST_HEAD(&dev->ordered_cmd_list);
INIT_LIST_HEAD(&dev->state_task_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->ordered_cmd_lock);
spin_lock_init(&dev->state_task_lock);
spin_lock_init(&dev->dev_alua_lock);
spin_lock_init(&dev->dev_reservation_lock);
spin_lock_init(&dev->dev_status_lock);
spin_lock_init(&dev->dev_status_thr_lock);
spin_lock_init(&dev->se_port_lock);
spin_lock_init(&dev->se_tmr_lock);
spin_lock_init(&dev->qf_cmd_lock);
dev->queue_depth = dev_limits->queue_depth;
atomic_set(&dev->depth_left, dev->queue_depth);
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 out;
/*
* Startup the struct se_device processing thread
*/
dev->process_thread = kthread_run(transport_processing_thread, dev,
"LIO_%s", dev->transport->name);
if (IS_ERR(dev->process_thread)) {
pr_err("Unable to create kthread: LIO_%s\n",
dev->transport->name);
goto out;
}
/*
* 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 out;
}
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;
out:
kthread_stop(dev->process_thread);
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);
/* transport_generic_prepare_cdb():
*
* Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
* contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
* The point of this is since we are mapping iSCSI LUNs to
* SCSI Target IDs having a non-zero LUN in the CDB will throw the
* devices and HBAs for a loop.
*/
static inline void transport_generic_prepare_cdb(
unsigned char *cdb)
{
switch (cdb[0]) {
case READ_10: /* SBC - RDProtect */
case READ_12: /* SBC - RDProtect */
case READ_16: /* SBC - RDProtect */
case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
case VERIFY: /* SBC - VRProtect */
case VERIFY_16: /* SBC - VRProtect */
case WRITE_VERIFY: /* SBC - VRProtect */
case WRITE_VERIFY_12: /* SBC - VRProtect */
break;
default:
cdb[1] &= 0x1f; /* clear logical unit number */
break;
}
}
static struct se_task *
transport_generic_get_task(struct se_cmd *cmd,
enum dma_data_direction data_direction)
{
struct se_task *task;
struct se_device *dev = cmd->se_dev;
task = dev->transport->alloc_task(cmd->t_task_cdb);
if (!task) {
pr_err("Unable to allocate struct se_task\n");
return NULL;
}
INIT_LIST_HEAD(&task->t_list);
INIT_LIST_HEAD(&task->t_execute_list);
INIT_LIST_HEAD(&task->t_state_list);
init_completion(&task->task_stop_comp);
task->task_se_cmd = cmd;
task->se_dev = dev;
task->task_data_direction = data_direction;
return task;
}
static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
/*
* 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_ordered_node);
INIT_LIST_HEAD(&cmd->se_qf_node);
INIT_LIST_HEAD(&cmd->t_task_list);
init_completion(&cmd->transport_lun_fe_stop_comp);
init_completion(&cmd->transport_lun_stop_comp);
init_completion(&cmd->t_transport_stop_comp);
spin_lock_init(&cmd->t_state_lock);
atomic_set(&cmd->transport_dev_active, 1);
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;
}
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;
}
void transport_free_se_cmd(
struct se_cmd *se_cmd)
{
if (se_cmd->se_tmr_req)
core_tmr_release_req(se_cmd->se_tmr_req);
/*
* Check and free any extended CDB buffer that was allocated
*/
if (se_cmd->t_task_cdb != se_cmd->__t_task_cdb)
kfree(se_cmd->t_task_cdb);
}
EXPORT_SYMBOL(transport_free_se_cmd);
static void transport_generic_wait_for_tasks(struct se_cmd *, int, int);
/* transport_generic_allocate_tasks():
*
* Called from fabric RX Thread.
*/
int transport_generic_allocate_tasks(
struct se_cmd *cmd,
unsigned char *cdb)
{
int ret;
transport_generic_prepare_cdb(cdb);
/*
* This is needed for early exceptions.
*/
cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
/*
* 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);
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));
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));
/*
* Setup the received CDB based on SCSI defined opcodes and
* perform unit attention, persistent reservations and ALUA
* checks for virtual device backends. The cmd->t_task_cdb
* pointer is expected to be setup before we reach this point.
*/
ret = transport_generic_cmd_sequencer(cmd, cdb);
if (ret < 0)
return ret;
/*
* 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(transport_generic_allocate_tasks);
/*
* Used by fabric module frontends not defining a TFO->new_cmd_map()
* to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD statis
*/
int transport_generic_handle_cdb(
struct se_cmd *cmd)
{
if (!cmd->se_lun) {
dump_stack();
pr_err("cmd->se_lun is NULL\n");
return -EINVAL;
}
transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD);
return 0;
}
EXPORT_SYMBOL(transport_generic_handle_cdb);
static void transport_generic_request_failure(struct se_cmd *,
struct se_device *, int, int);
/*
* 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_transport_active=1 following
* transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
* in existing usage to ensure that outstanding descriptors are handled
* correctly during shutdown via transport_generic_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;
atomic_set(&cmd->t_transport_active, 1);
/*
* 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 == -EAGAIN)
return 0;
else if (ret < 0) {
cmd->transport_error_status = ret;
transport_generic_request_failure(cmd, NULL, 0,
(cmd->data_direction != DMA_TO_DEVICE));
}
return 0;
}
EXPORT_SYMBOL(transport_handle_cdb_direct);
/*
* Used by fabric module frontends defining a TFO->new_cmd_map() caller
* to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
* complete setup in TCM process context w/ TFO->new_cmd_map().
*/
int transport_generic_handle_cdb_map(
struct se_cmd *cmd)
{
if (!cmd->se_lun) {
dump_stack();
pr_err("cmd->se_lun is NULL\n");
return -EINVAL;
}
transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP);
return 0;
}
EXPORT_SYMBOL(transport_generic_handle_cdb_map);
/* transport_generic_handle_data():
*
*
*/
int transport_generic_handle_data(
struct se_cmd *cmd)
{
/*
* For the software fabric case, then we assume the nexus is being
* failed/shutdown when signals are pending from the kthread context
* caller, so we return a failure. For the HW target mode case running
* in interrupt code, the signal_pending() check is skipped.
*/
if (!in_interrupt() && signal_pending(current))
return -EPERM;
/*
* If the received CDB has aleady been ABORTED by the generic
* target engine, we now call transport_check_aborted_status()
* to queue any delated TASK_ABORTED status for the received CDB to the
* fabric module as we are expecting no further incoming DATA OUT
* sequences at this point.
*/
if (transport_check_aborted_status(cmd, 1) != 0)
return 0;
transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE);
return 0;
}
EXPORT_SYMBOL(transport_generic_handle_data);
/* transport_generic_handle_tmr():
*
*
*/
int transport_generic_handle_tmr(
struct se_cmd *cmd)
{
/*
* This is needed for early exceptions.
*/
cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks;
transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR);
return 0;
}
EXPORT_SYMBOL(transport_generic_handle_tmr);
void transport_generic_free_cmd_intr(
struct se_cmd *cmd)
{
transport_add_cmd_to_queue(cmd, TRANSPORT_FREE_CMD_INTR);
}
EXPORT_SYMBOL(transport_generic_free_cmd_intr);
static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
{
struct se_task *task, *task_tmp;
unsigned long flags;
int ret = 0;
pr_debug("ITT[0x%08x] - Stopping tasks\n",
cmd->se_tfo->get_task_tag(cmd));
/*
* No tasks remain in the execution queue
*/
spin_lock_irqsave(&cmd->t_state_lock, flags);
list_for_each_entry_safe(task, task_tmp,
&cmd->t_task_list, t_list) {
pr_debug("task_no[%d] - Processing task %p\n",
task->task_no, task);
/*
* If the struct se_task has not been sent and is not active,
* remove the struct se_task from the execution queue.
*/
if (!atomic_read(&task->task_sent) &&
!atomic_read(&task->task_active)) {
spin_unlock_irqrestore(&cmd->t_state_lock,
flags);
transport_remove_task_from_execute_queue(task,
task->se_dev);
pr_debug("task_no[%d] - Removed from execute queue\n",
task->task_no);
spin_lock_irqsave(&cmd->t_state_lock, flags);
continue;
}
/*
* If the struct se_task is active, sleep until it is returned
* from the plugin.
*/
if (atomic_read(&task->task_active)) {
atomic_set(&task->task_stop, 1);
spin_unlock_irqrestore(&cmd->t_state_lock,
flags);
pr_debug("task_no[%d] - Waiting to complete\n",
task->task_no);
wait_for_completion(&task->task_stop_comp);
pr_debug("task_no[%d] - Stopped successfully\n",
task->task_no);
spin_lock_irqsave(&cmd->t_state_lock, flags);
atomic_dec(&cmd->t_task_cdbs_left);
atomic_set(&task->task_active, 0);
atomic_set(&task->task_stop, 0);
} else {
pr_debug("task_no[%d] - Did nothing\n", task->task_no);
ret++;
}
__transport_stop_task_timer(task, &flags);
}
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
return ret;
}
/*
* Handle SAM-esque emulation for generic transport request failures.
*/
static void transport_generic_request_failure(
struct se_cmd *cmd,
struct se_device *dev,
int complete,
int sc)
{
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/def_t_state:"
" %d/%d transport_error_status: %d\n",
cmd->se_tfo->get_cmd_state(cmd),
cmd->t_state, cmd->deferred_t_state,
cmd->transport_error_status);
pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
" t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
" t_transport_active: %d t_transport_stop: %d"
" t_transport_sent: %d\n", cmd->t_task_list_num,
atomic_read(&cmd->t_task_cdbs_left),
atomic_read(&cmd->t_task_cdbs_sent),
atomic_read(&cmd->t_task_cdbs_ex_left),
atomic_read(&cmd->t_transport_active),
atomic_read(&cmd->t_transport_stop),
atomic_read(&cmd->t_transport_sent));
transport_stop_all_task_timers(cmd);
if (dev)
atomic_inc(&dev->depth_left);
/*
* 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);
if (complete) {
transport_direct_request_timeout(cmd);
cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
}
switch (cmd->transport_error_status) {
case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
break;
case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
break;
case PYX_TRANSPORT_INVALID_CDB_FIELD:
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
break;
case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
break;
case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
if (!sc)
transport_new_cmd_failure(cmd);
/*
* Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
* we force this session to fall back to session
* recovery.
*/
cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
goto check_stop;
case PYX_TRANSPORT_LU_COMM_FAILURE:
case PYX_TRANSPORT_ILLEGAL_REQUEST:
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
break;
case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
break;
case PYX_TRANSPORT_WRITE_PROTECTED:
cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
break;
case PYX_TRANSPORT_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)
goto queue_full;
goto check_stop;
case PYX_TRANSPORT_USE_SENSE_REASON:
/*
* struct se_cmd->scsi_sense_reason already set
*/
break;
default:
pr_err("Unknown transport error for CDB 0x%02x: %d\n",
cmd->t_task_cdb[0],
cmd->transport_error_status);
cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
break;
}
if (!sc)
transport_new_cmd_failure(cmd);
else {
ret = transport_send_check_condition_and_sense(cmd,
cmd->scsi_sense_reason, 0);
if (ret == -EAGAIN)
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_OK;
transport_handle_queue_full(cmd, cmd->se_dev, transport_complete_qf);
}
static void transport_direct_request_timeout(struct se_cmd *cmd)
{
unsigned long flags;
spin_lock_irqsave(&cmd->t_state_lock, flags);
if (!atomic_read(&cmd->t_transport_timeout)) {
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
return;
}
if (atomic_read(&cmd->t_task_cdbs_timeout_left)) {
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
return;
}
atomic_sub(atomic_read(&cmd->t_transport_timeout),
&cmd->t_se_count);
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
}
static void transport_generic_request_timeout(struct se_cmd *cmd)
{
unsigned long flags;
/*
* Reset cmd->t_se_count to allow transport_generic_remove()
* to allow last call to free memory resources.
*/
spin_lock_irqsave(&cmd->t_state_lock, flags);
if (atomic_read(&cmd->t_transport_timeout) > 1) {
int tmp = (atomic_read(&cmd->t_transport_timeout) - 1);
atomic_sub(tmp, &cmd->t_se_count);
}
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
transport_generic_remove(cmd, 0);
}
static inline u32 transport_lba_21(unsigned char *cdb)
{
return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
}
static inline u32 transport_lba_32(unsigned char *cdb)
{
return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
}
static inline unsigned long long transport_lba_64(unsigned char *cdb)
{
unsigned int __v1, __v2;
__v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
__v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
}
/*
* For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
*/
static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
{
unsigned int __v1, __v2;
__v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
__v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
}
static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
{
unsigned long flags;
spin_lock_irqsave(&se_cmd->t_state_lock, flags);
se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
}
/*
* Called from interrupt context.
*/
static void transport_task_timeout_handler(unsigned long data)
{
struct se_task *task = (struct se_task *)data;
struct se_cmd *cmd = task->task_se_cmd;
unsigned long flags;
pr_debug("transport task timeout fired! task: %p cmd: %p\n", task, cmd);
spin_lock_irqsave(&cmd->t_state_lock, flags);
if (task->task_flags & TF_STOP) {
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
return;
}
task->task_flags &= ~TF_RUNNING;
/*
* Determine if transport_complete_task() has already been called.
*/
if (!atomic_read(&task->task_active)) {
pr_debug("transport task: %p cmd: %p timeout task_active"
" == 0\n", task, cmd);
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
return;
}
atomic_inc(&cmd->t_se_count);
atomic_inc(&cmd->t_transport_timeout);
cmd->t_tasks_failed = 1;
atomic_set(&task->task_timeout, 1);
task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT;
task->task_scsi_status = 1;
if (atomic_read(&task->task_stop)) {
pr_debug("transport task: %p cmd: %p timeout task_stop"
" == 1\n", task, cmd);
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
complete(&task->task_stop_comp);
return;
}
if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
pr_debug("transport task: %p cmd: %p timeout non zero"
" t_task_cdbs_left\n", task, cmd);
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
return;
}
pr_debug("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n",
task, cmd);
cmd->t_state = TRANSPORT_COMPLETE_FAILURE;
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE);
}
/*
* Called with cmd->t_state_lock held.
*/
static void transport_start_task_timer(struct se_task *task)
{
struct se_device *dev = task->se_dev;
int timeout;
if (task->task_flags & TF_RUNNING)
return;
/*
* If the task_timeout is disabled, exit now.
*/
timeout = dev->se_sub_dev->se_dev_attrib.task_timeout;
if (!timeout)
return;
init_timer(&task->task_timer);
task->task_timer.expires = (get_jiffies_64() + timeout * HZ);
task->task_timer.data = (unsigned long) task;
task->task_timer.function = transport_task_timeout_handler;
task->task_flags |= TF_RUNNING;
add_timer(&task->task_timer);
#if 0
pr_debug("Starting task timer for cmd: %p task: %p seconds:"
" %d\n", task->task_se_cmd, task, timeout);
#endif
}
/*
* Called with spin_lock_irq(&cmd->t_state_lock) held.
*/
void __transport_stop_task_timer(struct se_task *task, unsigned long *flags)
{
struct se_cmd *cmd = task->task_se_cmd;
if (!task->task_flags & TF_RUNNING)
return;
task->task_flags |= TF_STOP;
spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
del_timer_sync(&task->task_timer);
spin_lock_irqsave(&cmd->t_state_lock, *flags);
task->task_flags &= ~TF_RUNNING;
task->task_flags &= ~TF_STOP;
}
static void transport_stop_all_task_timers(struct se_cmd *cmd)
{
struct se_task *task = NULL, *task_tmp;
unsigned long flags;
spin_lock_irqsave(&cmd->t_state_lock, flags);
list_for_each_entry_safe(task, task_tmp,
&cmd->t_task_list, t_list)
__transport_stop_task_timer(task, &flags);
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
}
static inline int transport_tcq_window_closed(struct se_device *dev)
{
if (dev->dev_tcq_window_closed++ <
PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
} else
msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
return 0;
}
/*
* Called from Fabric Module context from transport_execute_tasks()
*
* The return of this function determins if the tasks from struct se_cmd
* get added to the execution queue in transport_execute_tasks(),
* or are added to the delayed or ordered lists here.
*/
static inline int transport_execute_task_attr(struct se_cmd *cmd)
{
if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
return 1;
/*
* 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.
*/
if (cmd->sam_task_attr == MSG_HEAD_TAG) {
atomic_inc(&cmd->se_dev->dev_hoq_count);
smp_mb__after_atomic_inc();
pr_debug("Added HEAD_OF_QUEUE for CDB:"
" 0x%02x, se_ordered_id: %u\n",
cmd->t_task_cdb[0],
cmd->se_ordered_id);
return 1;
} else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
spin_lock(&cmd->se_dev->ordered_cmd_lock);
list_add_tail(&cmd->se_ordered_node,
&cmd->se_dev->ordered_cmd_list);
spin_unlock(&cmd->se_dev->ordered_cmd_lock);
atomic_inc(&cmd->se_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);
/*
* Add ORDERED command to tail of execution queue if
* no other older commands exist that need to be
* completed first.
*/
if (!atomic_read(&cmd->se_dev->simple_cmds))
return 1;
} else {
/*
* For SIMPLE and UNTAGGED Task Attribute commands
*/
atomic_inc(&cmd->se_dev->simple_cmds);
smp_mb__after_atomic_inc();
}
/*
* Otherwise if one or more outstanding ORDERED task attribute exist,
* add the dormant task(s) built for the passed struct se_cmd to the
* execution queue and become in Active state for this struct se_device.
*/
if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
/*
* Otherwise, add cmd w/ tasks to delayed cmd queue that
* will be drained upon completion of HEAD_OF_QUEUE task.
*/
spin_lock(&cmd->se_dev->delayed_cmd_lock);
cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
list_add_tail(&cmd->se_delayed_node,
&cmd->se_dev->delayed_cmd_list);
spin_unlock(&cmd->se_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 zero to let transport_execute_tasks() know
* not to add the delayed tasks to the execution list.
*/
return 0;
}
/*
* Otherwise, no ORDERED task attributes exist..
*/
return 1;
}
/*
* Called from fabric module context in transport_generic_new_cmd() and
* transport_generic_process_write()
*/
static int transport_execute_tasks(struct se_cmd *cmd)
{
int add_tasks;
if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
transport_generic_request_failure(cmd, NULL, 0, 1);
return 0;
}
/*
* Call transport_cmd_check_stop() to see if a fabric exception
* has occurred that prevents execution.
*/
if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
/*
* Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
* attribute for the tasks of the received struct se_cmd CDB
*/
add_tasks = transport_execute_task_attr(cmd);
if (!add_tasks)
goto execute_tasks;
/*
* This calls transport_add_tasks_from_cmd() to handle
* HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
* (if enabled) in __transport_add_task_to_execute_queue() and
* transport_add_task_check_sam_attr().
*/
transport_add_tasks_from_cmd(cmd);
}
/*
* Kick the execution queue for the cmd associated struct se_device
* storage object.
*/
execute_tasks:
__transport_execute_tasks(cmd->se_dev);
return 0;
}
/*
* Called to check struct se_device tcq depth window, and once open pull struct se_task
* from struct se_device->execute_task_list and
*
* Called from transport_processing_thread()
*/
static int __transport_execute_tasks(struct se_device *dev)
{
int error;
struct se_cmd *cmd = NULL;
struct se_task *task = NULL;
unsigned long flags;
/*
* Check if there is enough room in the device and HBA queue to send
* struct se_tasks to the selected transport.
*/
check_depth:
if (!atomic_read(&dev->depth_left))
return transport_tcq_window_closed(dev);
dev->dev_tcq_window_closed = 0;
spin_lock_irq(&dev->execute_task_lock);
if (list_empty(&dev->execute_task_list)) {
spin_unlock_irq(&dev->execute_task_lock);
return 0;
}
task = list_first_entry(&dev->execute_task_list,
struct se_task, t_execute_list);
list_del(&task->t_execute_list);
atomic_set(&task->task_execute_queue, 0);
atomic_dec(&dev->execute_tasks);
spin_unlock_irq(&dev->execute_task_lock);
atomic_dec(&dev->depth_left);
cmd = task->task_se_cmd;
spin_lock_irqsave(&cmd->t_state_lock, flags);
atomic_set(&task->task_active, 1);
atomic_set(&task->task_sent, 1);
atomic_inc(&cmd->t_task_cdbs_sent);
if (atomic_read(&cmd->t_task_cdbs_sent) ==
cmd->t_task_list_num)
atomic_set(&cmd->transport_sent, 1);
transport_start_task_timer(task);
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
/*
* The struct se_cmd->transport_emulate_cdb() function pointer is used
* to grab REPORT_LUNS and other CDBs we want to handle before they hit the
* struct se_subsystem_api->do_task() caller below.
*/
if (cmd->transport_emulate_cdb) {
error = cmd->transport_emulate_cdb(cmd);
if (error != 0) {
cmd->transport_error_status = error;
atomic_set(&task->task_active, 0);
atomic_set(&cmd->transport_sent, 0);
transport_stop_tasks_for_cmd(cmd);
transport_generic_request_failure(cmd, dev, 0, 1);
goto check_depth;
}
/*
* Handle the successful completion for transport_emulate_cdb()
* for synchronous operation, following SCF_EMULATE_CDB_ASYNC
* Otherwise the caller is expected to complete the task with
* proper status.
*/
if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) {
cmd->scsi_status = SAM_STAT_GOOD;
task->task_scsi_status = GOOD;
transport_complete_task(task, 1);
}
} else {
/*
* Currently for all virtual TCM plugins including IBLOCK, FILEIO and
* RAMDISK we use the internal transport_emulate_control_cdb() logic
* with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK
* LUN emulation code.
*
* For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we
* call ->do_task() directly and let the underlying TCM subsystem plugin
* code handle the CDB emulation.
*/
if ((dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) &&
(!(task->task_se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
error = transport_emulate_control_cdb(task);
else
error = dev->transport->do_task(task);
if (error != 0) {
cmd->transport_error_status = error;
atomic_set(&task->task_active, 0);
atomic_set(&cmd->transport_sent, 0);
transport_stop_tasks_for_cmd(cmd);
transport_generic_request_failure(cmd, dev, 0, 1);
}
}
goto check_depth;
return 0;
}
void transport_new_cmd_failure(struct se_cmd *se_cmd)
{
unsigned long flags;
/*
* Any unsolicited data will get dumped for failed command inside of
* the fabric plugin
*/
spin_lock_irqsave(&se_cmd->t_state_lock, flags);
se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
}
static void transport_nop_wait_for_tasks(struct se_cmd *, int, int);
static inline u32 transport_get_sectors_6(
unsigned char *cdb,
struct se_cmd *cmd,
int *ret)
{
struct se_device *dev = cmd->se_dev;
/*
* Assume TYPE_DISK for non struct se_device objects.
* Use 8-bit sector value.
*/
if (!dev)
goto type_disk;
/*
* Use 24-bit allocation length for TYPE_TAPE.
*/
if (dev->transport->get_device_type(dev) == TYPE_TAPE)
return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
/*
* Everything else assume TYPE_DISK Sector CDB location.
* Use 8-bit sector value.
*/
type_disk:
return (u32)cdb[4];
}
static inline u32 transport_get_sectors_10(
unsigned char *cdb,
struct se_cmd *cmd,
int *ret)
{
struct se_device *dev = cmd->se_dev;
/*
* Assume TYPE_DISK for non struct se_device objects.
* Use 16-bit sector value.
*/
if (!dev)
goto type_disk;
/*
* XXX_10 is not defined in SSC, throw an exception
*/
if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
*ret = -EINVAL;
return 0;
}
/*
* Everything else assume TYPE_DISK Sector CDB location.
* Use 16-bit sector value.
*/
type_disk:
return (u32)(cdb[7] << 8) + cdb[8];
}
static inline u32 transport_get_sectors_12(
unsigned char *cdb,
struct se_cmd *cmd,
int *ret)
{
struct se_device *dev = cmd->se_dev;
/*
* Assume TYPE_DISK for non struct se_device objects.
* Use 32-bit sector value.
*/
if (!dev)
goto type_disk;
/*
* XXX_12 is not defined in SSC, throw an exception
*/
if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
*ret = -EINVAL;
return 0;
}
/*
* Everything else assume TYPE_DISK Sector CDB location.
* Use 32-bit sector value.
*/
type_disk:
return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
}
static inline u32 transport_get_sectors_16(
unsigned char *cdb,
struct se_cmd *cmd,
int *ret)
{
struct se_device *dev = cmd->se_dev;
/*
* Assume TYPE_DISK for non struct se_device objects.
* Use 32-bit sector value.
*/
if (!dev)
goto type_disk;
/*
* Use 24-bit allocation length for TYPE_TAPE.
*/
if (dev->transport->get_device_type(dev) == TYPE_TAPE)
return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
type_disk:
return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
(cdb[12] << 8) + cdb[13];
}
/*
* Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
*/
static inline u32 transport_get_sectors_32(
unsigned char *cdb,
struct se_cmd *cmd,
int *ret)
{
/*
* Assume TYPE_DISK for non struct se_device objects.
* Use 32-bit sector value.
*/
return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
(cdb[30] << 8) + cdb[31];
}
static inline u32 transport_get_size(
u32 sectors,
unsigned char *cdb,
struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
if (cdb[1] & 1) { /* sectors */
return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
} else /* bytes */
return sectors;
}
#if 0
pr_debug("Returning block_size: %u, sectors: %u == %u for"
" %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
dev->se_sub_dev->se_dev_attrib.block_size * sectors,
dev->transport->name);
#endif
return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
}
static void transport_xor_callback(struct se_cmd *cmd)
{
unsigned char *buf, *addr;
struct scatterlist *sg;
unsigned int offset;
int i;
int count;
/*
* From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
*
* 1) read the specified logical block(s);
* 2) transfer logical blocks from the data-out buffer;
* 3) XOR the logical blocks transferred from the data-out buffer with
* the logical blocks read, storing the resulting XOR data in a buffer;
* 4) if the DISABLE WRITE bit is set to zero, then write the logical
* blocks transferred from the data-out buffer; and
* 5) transfer the resulting XOR data to the data-in buffer.
*/
buf = kmalloc(cmd->data_length, GFP_KERNEL);
if (!buf) {
pr_err("Unable to allocate xor_callback buf\n");
return;
}
/*
* Copy the scatterlist WRITE buffer located at cmd->t_data_sg
* into the locally allocated *buf
*/
sg_copy_to_buffer(cmd->t_data_sg,
cmd->t_data_nents,
buf,
cmd->data_length);
/*
* Now perform the XOR against the BIDI read memory located at
* cmd->t_mem_bidi_list
*/
offset = 0;
for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
addr = kmap_atomic(sg_page(sg), KM_USER0);
if (!addr)
goto out;
for (i = 0; i < sg->length; i++)
*(addr + sg->offset + i) ^= *(buf + offset + i);
offset += sg->length;
kunmap_atomic(addr, KM_USER0);
}
out:
kfree(buf);
}
/*
* Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
*/
static int transport_get_sense_data(struct se_cmd *cmd)
{
unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
struct se_device *dev;
struct se_task *task = NULL, *task_tmp;
unsigned long flags;
u32 offset = 0;
WARN_ON(!cmd->se_lun);
spin_lock_irqsave(&cmd->t_state_lock, flags);
if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
return 0;
}
list_for_each_entry_safe(task, task_tmp,
&cmd->t_task_list, t_list) {
if (!task->task_sense)
continue;
dev = task->se_dev;
if (!dev)
continue;
if (!dev->transport->get_sense_buffer) {
pr_err("dev->transport->get_sense_buffer"
" is NULL\n");
continue;
}
sense_buffer = dev->transport->get_sense_buffer(task);
if (!sense_buffer) {
pr_err("ITT[0x%08x]_TASK[%d]: Unable to locate"
" sense buffer for task with sense\n",
cmd->se_tfo->get_task_tag(cmd), task->task_no);
continue;
}
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
offset = cmd->se_tfo->set_fabric_sense_len(cmd,
TRANSPORT_SENSE_BUFFER);
memcpy(&buffer[offset], sense_buffer,
TRANSPORT_SENSE_BUFFER);
cmd->scsi_status = task->task_scsi_status;
/* Automatically padded */
cmd->scsi_sense_length =
(TRANSPORT_SENSE_BUFFER + offset);
pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
" and sense\n",
dev->se_hba->hba_id, dev->transport->name,
cmd->scsi_status);
return 0;
}
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
return -1;
}
static int
transport_handle_reservation_conflict(struct se_cmd *cmd)
{
cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks;
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
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);
return -EINVAL;
}
static inline long long transport_dev_end_lba(struct se_device *dev)
{
return dev->transport->get_blocks(dev) + 1;
}
static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
u32 sectors;
if (dev->transport->get_device_type(dev) != TYPE_DISK)
return 0;
sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);