forked from Minki/linux
9ba55cf7cf
Pull SCSI target updates from Nicholas Bellinger:
"Here are the outstanding target pending updates for v4.7-rc1.
The highlights this round include:
- Allow external PR/ALUA metadata path be defined at runtime via top
level configfs attribute (Lee)
- Fix target session shutdown bug for ib_srpt multi-channel (hch)
- Make TFO close_session() and shutdown_session() optional (hch)
- Drop se_sess->sess_kref + convert tcm_qla2xxx to internal kref
(hch)
- Add tcm_qla2xxx endpoint attribute for basic FC jammer (Laurence)
- Refactor iscsi-target RX/TX PDU encode/decode into common code
(Varun)
- Extend iscsit_transport with xmit_pdu, release_cmd, get_rx_pdu,
validate_parameters, and get_r2t_ttt for generic ISO offload
(Varun)
- Initial merge of cxgb iscsi-segment offload target driver (Varun)
The bulk of the changes are Chelsio's new driver, along with a number
of iscsi-target common code improvements made by Varun + Co along the
way"
* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (29 commits)
iscsi-target: Fix early sk_data_ready LOGIN_FLAGS_READY race
cxgbit: Use type ISCSI_CXGBIT + cxgbit tpg_np attribute
iscsi-target: Convert transport drivers to signal rdma_shutdown
iscsi-target: Make iscsi_tpg_np driver show/store use generic code
tcm_qla2xxx Add SCSI command jammer/discard capability
iscsi-target: graceful disconnect on invalid mapping to iovec
target: need_to_release is always false, remove redundant check and kfree
target: remove sess_kref and ->shutdown_session
iscsi-target: remove usage of ->shutdown_session
tcm_qla2xxx: introduce a private sess_kref
target: make close_session optional
target: make ->shutdown_session optional
target: remove acl_stop
target: consolidate and fix session shutdown
cxgbit: add files for cxgbit.ko
iscsi-target: export symbols
iscsi-target: call complete on conn_logout_comp
iscsi-target: clear tx_thread_active
iscsi-target: add new offload transport type
iscsi-target: use conn_transport->transport_type in text rsp
...
3110 lines
83 KiB
C
3110 lines
83 KiB
C
/*******************************************************************************
|
|
* Filename: target_core_transport.c
|
|
*
|
|
* This file contains the Generic Target Engine Core.
|
|
*
|
|
* (c) Copyright 2002-2013 Datera, Inc.
|
|
*
|
|
* 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/spinlock.h>
|
|
#include <linux/kthread.h>
|
|
#include <linux/in.h>
|
|
#include <linux/cdrom.h>
|
|
#include <linux/module.h>
|
|
#include <linux/ratelimit.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <asm/unaligned.h>
|
|
#include <net/sock.h>
|
|
#include <net/tcp.h>
|
|
#include <scsi/scsi_proto.h>
|
|
#include <scsi/scsi_common.h>
|
|
|
|
#include <target/target_core_base.h>
|
|
#include <target/target_core_backend.h>
|
|
#include <target/target_core_fabric.h>
|
|
|
|
#include "target_core_internal.h"
|
|
#include "target_core_alua.h"
|
|
#include "target_core_pr.h"
|
|
#include "target_core_ua.h"
|
|
|
|
#define CREATE_TRACE_POINTS
|
|
#include <trace/events/target.h>
|
|
|
|
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_lba_map_cache;
|
|
struct kmem_cache *t10_alua_lba_map_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_put_cmd(struct se_cmd *cmd);
|
|
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_lba_map_cache = kmem_cache_create(
|
|
"t10_alua_lba_map_cache",
|
|
sizeof(struct t10_alua_lba_map),
|
|
__alignof__(struct t10_alua_lba_map), 0, NULL);
|
|
if (!t10_alua_lba_map_cache) {
|
|
pr_err("kmem_cache_create() for t10_alua_lba_map_"
|
|
"cache failed\n");
|
|
goto out_free_tg_pt_gp_cache;
|
|
}
|
|
t10_alua_lba_map_mem_cache = kmem_cache_create(
|
|
"t10_alua_lba_map_mem_cache",
|
|
sizeof(struct t10_alua_lba_map_member),
|
|
__alignof__(struct t10_alua_lba_map_member), 0, NULL);
|
|
if (!t10_alua_lba_map_mem_cache) {
|
|
pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
|
|
"cache failed\n");
|
|
goto out_free_lba_map_cache;
|
|
}
|
|
|
|
target_completion_wq = alloc_workqueue("target_completion",
|
|
WQ_MEM_RECLAIM, 0);
|
|
if (!target_completion_wq)
|
|
goto out_free_lba_map_mem_cache;
|
|
|
|
return 0;
|
|
|
|
out_free_lba_map_mem_cache:
|
|
kmem_cache_destroy(t10_alua_lba_map_mem_cache);
|
|
out_free_lba_map_cache:
|
|
kmem_cache_destroy(t10_alua_lba_map_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_lba_map_cache);
|
|
kmem_cache_destroy(t10_alua_lba_map_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;
|
|
static int sub_api_initialized;
|
|
|
|
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_user");
|
|
if (ret != 0)
|
|
pr_err("Unable to load target_core_user\n");
|
|
|
|
sub_api_initialized = 1;
|
|
}
|
|
|
|
struct se_session *transport_init_session(enum target_prot_op sup_prot_ops)
|
|
{
|
|
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);
|
|
INIT_LIST_HEAD(&se_sess->sess_wait_list);
|
|
spin_lock_init(&se_sess->sess_cmd_lock);
|
|
se_sess->sup_prot_ops = sup_prot_ops;
|
|
|
|
return se_sess;
|
|
}
|
|
EXPORT_SYMBOL(transport_init_session);
|
|
|
|
int transport_alloc_session_tags(struct se_session *se_sess,
|
|
unsigned int tag_num, unsigned int tag_size)
|
|
{
|
|
int rc;
|
|
|
|
se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
|
|
GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
|
|
if (!se_sess->sess_cmd_map) {
|
|
se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
|
|
if (!se_sess->sess_cmd_map) {
|
|
pr_err("Unable to allocate se_sess->sess_cmd_map\n");
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
|
|
if (rc < 0) {
|
|
pr_err("Unable to init se_sess->sess_tag_pool,"
|
|
" tag_num: %u\n", tag_num);
|
|
kvfree(se_sess->sess_cmd_map);
|
|
se_sess->sess_cmd_map = NULL;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(transport_alloc_session_tags);
|
|
|
|
struct se_session *transport_init_session_tags(unsigned int tag_num,
|
|
unsigned int tag_size,
|
|
enum target_prot_op sup_prot_ops)
|
|
{
|
|
struct se_session *se_sess;
|
|
int rc;
|
|
|
|
if (tag_num != 0 && !tag_size) {
|
|
pr_err("init_session_tags called with percpu-ida tag_num:"
|
|
" %u, but zero tag_size\n", tag_num);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
if (!tag_num && tag_size) {
|
|
pr_err("init_session_tags called with percpu-ida tag_size:"
|
|
" %u, but zero tag_num\n", tag_size);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
se_sess = transport_init_session(sup_prot_ops);
|
|
if (IS_ERR(se_sess))
|
|
return se_sess;
|
|
|
|
rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
|
|
if (rc < 0) {
|
|
transport_free_session(se_sess);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
return se_sess;
|
|
}
|
|
EXPORT_SYMBOL(transport_init_session_tags);
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
|
|
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) {
|
|
/*
|
|
*
|
|
* Determine if fabric allows for T10-PI feature bits exposed to
|
|
* initiators for device backends with !dev->dev_attrib.pi_prot_type.
|
|
*
|
|
* If so, then always save prot_type on a per se_node_acl node
|
|
* basis and re-instate the previous sess_prot_type to avoid
|
|
* disabling PI from below any previously initiator side
|
|
* registered LUNs.
|
|
*/
|
|
if (se_nacl->saved_prot_type)
|
|
se_sess->sess_prot_type = se_nacl->saved_prot_type;
|
|
else if (tfo->tpg_check_prot_fabric_only)
|
|
se_sess->sess_prot_type = se_nacl->saved_prot_type =
|
|
tfo->tpg_check_prot_fabric_only(se_tpg);
|
|
/*
|
|
* 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)
|
|
{
|
|
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);
|
|
|
|
struct se_session *
|
|
target_alloc_session(struct se_portal_group *tpg,
|
|
unsigned int tag_num, unsigned int tag_size,
|
|
enum target_prot_op prot_op,
|
|
const char *initiatorname, void *private,
|
|
int (*callback)(struct se_portal_group *,
|
|
struct se_session *, void *))
|
|
{
|
|
struct se_session *sess;
|
|
|
|
/*
|
|
* If the fabric driver is using percpu-ida based pre allocation
|
|
* of I/O descriptor tags, go ahead and perform that setup now..
|
|
*/
|
|
if (tag_num != 0)
|
|
sess = transport_init_session_tags(tag_num, tag_size, prot_op);
|
|
else
|
|
sess = transport_init_session(prot_op);
|
|
|
|
if (IS_ERR(sess))
|
|
return sess;
|
|
|
|
sess->se_node_acl = core_tpg_check_initiator_node_acl(tpg,
|
|
(unsigned char *)initiatorname);
|
|
if (!sess->se_node_acl) {
|
|
transport_free_session(sess);
|
|
return ERR_PTR(-EACCES);
|
|
}
|
|
/*
|
|
* Go ahead and perform any remaining fabric setup that is
|
|
* required before transport_register_session().
|
|
*/
|
|
if (callback != NULL) {
|
|
int rc = callback(tpg, sess, private);
|
|
if (rc) {
|
|
transport_free_session(sess);
|
|
return ERR_PTR(rc);
|
|
}
|
|
}
|
|
|
|
transport_register_session(tpg, sess->se_node_acl, sess, private);
|
|
return sess;
|
|
}
|
|
EXPORT_SYMBOL(target_alloc_session);
|
|
|
|
ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
|
|
{
|
|
struct se_session *se_sess;
|
|
ssize_t len = 0;
|
|
|
|
spin_lock_bh(&se_tpg->session_lock);
|
|
list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
|
|
if (!se_sess->se_node_acl)
|
|
continue;
|
|
if (!se_sess->se_node_acl->dynamic_node_acl)
|
|
continue;
|
|
if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
|
|
break;
|
|
|
|
len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
|
|
se_sess->se_node_acl->initiatorname);
|
|
len += 1; /* Include NULL terminator */
|
|
}
|
|
spin_unlock_bh(&se_tpg->session_lock);
|
|
|
|
return len;
|
|
}
|
|
EXPORT_SYMBOL(target_show_dynamic_sessions);
|
|
|
|
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);
|
|
}
|
|
EXPORT_SYMBOL(target_put_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 (!list_empty(&se_sess->sess_acl_list))
|
|
list_del_init(&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)
|
|
{
|
|
struct se_node_acl *se_nacl = se_sess->se_node_acl;
|
|
/*
|
|
* Drop the se_node_acl->nacl_kref obtained from within
|
|
* core_tpg_get_initiator_node_acl().
|
|
*/
|
|
if (se_nacl) {
|
|
se_sess->se_node_acl = NULL;
|
|
target_put_nacl(se_nacl);
|
|
}
|
|
if (se_sess->sess_cmd_map) {
|
|
percpu_ida_destroy(&se_sess->sess_tag_pool);
|
|
kvfree(se_sess->sess_cmd_map);
|
|
}
|
|
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;
|
|
const struct target_core_fabric_ops *se_tfo;
|
|
struct se_node_acl *se_nacl;
|
|
unsigned long flags;
|
|
bool drop_nacl = false;
|
|
|
|
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;
|
|
|
|
mutex_lock(&se_tpg->acl_node_mutex);
|
|
if (se_nacl && se_nacl->dynamic_node_acl) {
|
|
if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
|
|
list_del(&se_nacl->acl_list);
|
|
drop_nacl = true;
|
|
}
|
|
}
|
|
mutex_unlock(&se_tpg->acl_node_mutex);
|
|
|
|
if (drop_nacl) {
|
|
core_tpg_wait_for_nacl_pr_ref(se_nacl);
|
|
core_free_device_list_for_node(se_nacl, se_tpg);
|
|
se_sess->se_node_acl = NULL;
|
|
kfree(se_nacl);
|
|
}
|
|
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 explicit NodeACL, awake sleeping
|
|
* ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
|
|
* removal context from within transport_free_session() code.
|
|
*/
|
|
|
|
transport_free_session(se_sess);
|
|
}
|
|
EXPORT_SYMBOL(transport_deregister_session);
|
|
|
|
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,
|
|
bool write_pending)
|
|
{
|
|
unsigned long flags;
|
|
|
|
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;
|
|
}
|
|
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
if (write_pending)
|
|
cmd->t_state = TRANSPORT_WRITE_PENDING;
|
|
|
|
/*
|
|
* 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%08llx\n",
|
|
__func__, __LINE__, cmd->tag);
|
|
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
complete_all(&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, false);
|
|
}
|
|
|
|
static void transport_lun_remove_cmd(struct se_cmd *cmd)
|
|
{
|
|
struct se_lun *lun = cmd->se_lun;
|
|
|
|
if (!lun)
|
|
return;
|
|
|
|
if (cmpxchg(&cmd->lun_ref_active, true, false))
|
|
percpu_ref_put(&lun->lun_ref);
|
|
}
|
|
|
|
void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
|
|
{
|
|
bool ack_kref = (cmd->se_cmd_flags & SCF_ACK_KREF);
|
|
|
|
if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
|
|
transport_lun_remove_cmd(cmd);
|
|
/*
|
|
* Allow the fabric driver to unmap any resources before
|
|
* releasing the descriptor via TFO->release_cmd()
|
|
*/
|
|
if (remove)
|
|
cmd->se_tfo->aborted_task(cmd);
|
|
|
|
if (transport_cmd_check_stop_to_fabric(cmd))
|
|
return;
|
|
if (remove && ack_kref)
|
|
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,
|
|
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
struct se_device *dev = cmd->se_dev;
|
|
|
|
WARN_ON(!cmd->se_lun);
|
|
|
|
if (!dev)
|
|
return NULL;
|
|
|
|
if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
|
|
return NULL;
|
|
|
|
cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
|
|
|
|
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 cmd->sense_buffer;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Check for case where an explicit 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_all(&cmd->t_transport_stop_comp);
|
|
return;
|
|
} else if (!success) {
|
|
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);
|
|
|
|
if (cmd->se_cmd_flags & SCF_USE_CPUID)
|
|
queue_work_on(cmd->cpuid, target_completion_wq, &cmd->work);
|
|
else
|
|
queue_work(target_completion_wq, &cmd->work);
|
|
}
|
|
EXPORT_SYMBOL(target_complete_cmd);
|
|
|
|
void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
|
|
{
|
|
if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
|
|
if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
|
|
cmd->residual_count += cmd->data_length - length;
|
|
} else {
|
|
cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
|
|
cmd->residual_count = cmd->data_length - length;
|
|
}
|
|
|
|
cmd->data_length = length;
|
|
}
|
|
|
|
target_complete_cmd(cmd, scsi_status);
|
|
}
|
|
EXPORT_SYMBOL(target_complete_cmd_with_length);
|
|
|
|
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);
|
|
|
|
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_mb(&dev->dev_qf_count);
|
|
|
|
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: ");
|
|
if (dev->export_count)
|
|
*bl += sprintf(b + *bl, "ACTIVATED");
|
|
else
|
|
*bl += sprintf(b + *bl, "DEACTIVATED");
|
|
|
|
*bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
|
|
*bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
|
|
dev->dev_attrib.block_size,
|
|
dev->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 */
|
|
snprintf(buf, sizeof(buf),
|
|
"T10 VPD Binary Device Identifier: %s\n",
|
|
&vpd->device_identifier[0]);
|
|
break;
|
|
case 0x02: /* ASCII */
|
|
snprintf(buf, sizeof(buf),
|
|
"T10 VPD ASCII Device Identifier: %s\n",
|
|
&vpd->device_identifier[0]);
|
|
break;
|
|
case 0x03: /* UTF-8 */
|
|
snprintf(buf, sizeof(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 identifier */
|
|
|
|
/*
|
|
* 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 sense_reason_t
|
|
target_check_max_data_sg_nents(struct se_cmd *cmd, struct se_device *dev,
|
|
unsigned int size)
|
|
{
|
|
u32 mtl;
|
|
|
|
if (!cmd->se_tfo->max_data_sg_nents)
|
|
return TCM_NO_SENSE;
|
|
/*
|
|
* Check if fabric enforced maximum SGL entries per I/O descriptor
|
|
* exceeds se_cmd->data_length. If true, set SCF_UNDERFLOW_BIT +
|
|
* residual_count and reduce original cmd->data_length to maximum
|
|
* length based on single PAGE_SIZE entry scatter-lists.
|
|
*/
|
|
mtl = (cmd->se_tfo->max_data_sg_nents * PAGE_SIZE);
|
|
if (cmd->data_length > mtl) {
|
|
/*
|
|
* If an existing CDB overflow is present, calculate new residual
|
|
* based on CDB size minus fabric maximum transfer length.
|
|
*
|
|
* If an existing CDB underflow is present, calculate new residual
|
|
* based on original cmd->data_length minus fabric maximum transfer
|
|
* length.
|
|
*
|
|
* Otherwise, set the underflow residual based on cmd->data_length
|
|
* minus fabric maximum transfer length.
|
|
*/
|
|
if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
|
|
cmd->residual_count = (size - mtl);
|
|
} else if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
|
|
u32 orig_dl = size + cmd->residual_count;
|
|
cmd->residual_count = (orig_dl - mtl);
|
|
} else {
|
|
cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
|
|
cmd->residual_count = (cmd->data_length - mtl);
|
|
}
|
|
cmd->data_length = mtl;
|
|
/*
|
|
* Reset sbc_check_prot() calculated protection payload
|
|
* length based upon the new smaller MTL.
|
|
*/
|
|
if (cmd->prot_length) {
|
|
u32 sectors = (mtl / dev->dev_attrib.block_size);
|
|
cmd->prot_length = dev->prot_length * sectors;
|
|
}
|
|
}
|
|
return TCM_NO_SENSE;
|
|
}
|
|
|
|
sense_reason_t
|
|
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 &&
|
|
cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
|
|
pr_err("Rejecting underflow/overflow WRITE data\n");
|
|
return TCM_INVALID_CDB_FIELD;
|
|
}
|
|
/*
|
|
* Reject READ_* or WRITE_* with overflow/underflow for
|
|
* type SCF_SCSI_DATA_CDB.
|
|
*/
|
|
if (dev->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 */
|
|
return TCM_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 target_check_max_data_sg_nents(cmd, dev, size);
|
|
|
|
}
|
|
|
|
/*
|
|
* Used by fabric modules containing a local struct se_cmd within their
|
|
* fabric dependent per I/O descriptor.
|
|
*
|
|
* Preserves the value of @cmd->tag.
|
|
*/
|
|
void transport_init_se_cmd(
|
|
struct se_cmd *cmd,
|
|
const 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_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->t_transport_stop_comp);
|
|
init_completion(&cmd->cmd_wait_comp);
|
|
spin_lock_init(&cmd->t_state_lock);
|
|
kref_init(&cmd->cmd_kref);
|
|
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 sense_reason_t
|
|
transport_check_alloc_task_attr(struct se_cmd *cmd)
|
|
{
|
|
struct se_device *dev = cmd->se_dev;
|
|
|
|
/*
|
|
* Check if SAM Task Attribute emulation is enabled for this
|
|
* struct se_device storage object
|
|
*/
|
|
if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
|
|
return 0;
|
|
|
|
if (cmd->sam_task_attr == TCM_ACA_TAG) {
|
|
pr_debug("SAM Task Attribute ACA"
|
|
" emulation is not supported\n");
|
|
return TCM_INVALID_CDB_FIELD;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
sense_reason_t
|
|
target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
|
|
{
|
|
struct se_device *dev = cmd->se_dev;
|
|
sense_reason_t 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);
|
|
return TCM_INVALID_CDB_FIELD;
|
|
}
|
|
/*
|
|
* 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 TCM_OUT_OF_RESOURCES;
|
|
}
|
|
} 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));
|
|
|
|
trace_target_sequencer_start(cmd);
|
|
|
|
/*
|
|
* Check for an existing UNIT ATTENTION condition
|
|
*/
|
|
ret = target_scsi3_ua_check(cmd);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = target_alua_state_check(cmd);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = target_check_reservation(cmd);
|
|
if (ret) {
|
|
cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
|
|
return ret;
|
|
}
|
|
|
|
ret = dev->transport->parse_cdb(cmd);
|
|
if (ret == TCM_UNSUPPORTED_SCSI_OPCODE)
|
|
pr_warn_ratelimited("%s/%s: Unsupported SCSI Opcode 0x%02x, sending CHECK_CONDITION.\n",
|
|
cmd->se_tfo->get_fabric_name(),
|
|
cmd->se_sess->se_node_acl->initiatorname,
|
|
cmd->t_task_cdb[0]);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = transport_check_alloc_task_attr(cmd);
|
|
if (ret)
|
|
return ret;
|
|
|
|
cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
|
|
atomic_long_inc(&cmd->se_lun->lun_stats.cmd_pdus);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(target_setup_cmd_from_cdb);
|
|
|
|
/*
|
|
* Used by fabric module frontends to queue tasks directly.
|
|
* May only be used from process context.
|
|
*/
|
|
int transport_handle_cdb_direct(
|
|
struct se_cmd *cmd)
|
|
{
|
|
sense_reason_t 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)
|
|
transport_generic_request_failure(cmd, ret);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(transport_handle_cdb_direct);
|
|
|
|
sense_reason_t
|
|
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");
|
|
return TCM_INVALID_CDB_FIELD;
|
|
}
|
|
|
|
cmd->t_data_sg = sgl;
|
|
cmd->t_data_nents = sgl_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;
|
|
}
|
|
|
|
/*
|
|
* target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
|
|
* se_cmd + use pre-allocated SGL memory.
|
|
*
|
|
* @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
|
|
* @sgl: struct scatterlist memory for unidirectional mapping
|
|
* @sgl_count: scatterlist count for unidirectional mapping
|
|
* @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
|
|
* @sgl_bidi_count: scatterlist count for bidirectional READ mapping
|
|
* @sgl_prot: struct scatterlist memory protection information
|
|
* @sgl_prot_count: scatterlist count for protection information
|
|
*
|
|
* Task tags are supported if the caller has set @se_cmd->tag.
|
|
*
|
|
* 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_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
|
|
unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
|
|
u32 data_length, int task_attr, int data_dir, int flags,
|
|
struct scatterlist *sgl, u32 sgl_count,
|
|
struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
|
|
struct scatterlist *sgl_prot, u32 sgl_prot_count)
|
|
{
|
|
struct se_portal_group *se_tpg;
|
|
sense_reason_t rc;
|
|
int ret;
|
|
|
|
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_USE_CPUID)
|
|
se_cmd->se_cmd_flags |= SCF_USE_CPUID;
|
|
else
|
|
se_cmd->cpuid = WORK_CPU_UNBOUND;
|
|
|
|
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.
|
|
*/
|
|
ret = target_get_sess_cmd(se_cmd, flags & TARGET_SCF_ACK_KREF);
|
|
if (ret)
|
|
return ret;
|
|
/*
|
|
* 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
|
|
*/
|
|
rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
|
|
if (rc) {
|
|
transport_send_check_condition_and_sense(se_cmd, rc, 0);
|
|
target_put_sess_cmd(se_cmd);
|
|
return 0;
|
|
}
|
|
|
|
rc = target_setup_cmd_from_cdb(se_cmd, cdb);
|
|
if (rc != 0) {
|
|
transport_generic_request_failure(se_cmd, rc);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Save pointers for SGLs containing protection information,
|
|
* if present.
|
|
*/
|
|
if (sgl_prot_count) {
|
|
se_cmd->t_prot_sg = sgl_prot;
|
|
se_cmd->t_prot_nents = sgl_prot_count;
|
|
se_cmd->se_cmd_flags |= SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC;
|
|
}
|
|
|
|
/*
|
|
* When a non zero sgl_count has been passed perform SGL passthrough
|
|
* mapping for pre-allocated fabric memory instead of having target
|
|
* core perform an internal SGL allocation..
|
|
*/
|
|
if (sgl_count != 0) {
|
|
BUG_ON(!sgl);
|
|
|
|
/*
|
|
* A work-around for tcm_loop as some userspace code via
|
|
* scsi-generic do not memset their associated read buffers,
|
|
* so go ahead and do that here for type non-data CDBs. Also
|
|
* note that this is currently guaranteed to be a single SGL
|
|
* for this case by target core in target_setup_cmd_from_cdb()
|
|
* -> transport_generic_cmd_sequencer().
|
|
*/
|
|
if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
|
|
se_cmd->data_direction == DMA_FROM_DEVICE) {
|
|
unsigned char *buf = NULL;
|
|
|
|
if (sgl)
|
|
buf = kmap(sg_page(sgl)) + sgl->offset;
|
|
|
|
if (buf) {
|
|
memset(buf, 0, sgl->length);
|
|
kunmap(sg_page(sgl));
|
|
}
|
|
}
|
|
|
|
rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
|
|
sgl_bidi, sgl_bidi_count);
|
|
if (rc != 0) {
|
|
transport_generic_request_failure(se_cmd, rc);
|
|
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_map_sgls);
|
|
|
|
/*
|
|
* 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
|
|
*
|
|
* Task tags are supported if the caller has set @se_cmd->tag.
|
|
*
|
|
* 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.
|
|
*
|
|
* It also assumes interal target core SGL memory allocation.
|
|
*/
|
|
int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
|
|
unsigned char *cdb, unsigned char *sense, u64 unpacked_lun,
|
|
u32 data_length, int task_attr, int data_dir, int flags)
|
|
{
|
|
return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
|
|
unpacked_lun, data_length, task_attr, data_dir,
|
|
flags, NULL, 0, NULL, 0, NULL, 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_cmd_check_stop_to_fabric(se_cmd);
|
|
}
|
|
|
|
/**
|
|
* 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, u64 unpacked_lun,
|
|
void *fabric_tmr_ptr, unsigned char tm_type,
|
|
gfp_t gfp, u64 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, TCM_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_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);
|
|
|
|
/*
|
|
* Handle SAM-esque emulation for generic transport request failures.
|
|
*/
|
|
void transport_generic_request_failure(struct se_cmd *cmd,
|
|
sense_reason_t sense_reason)
|
|
{
|
|
int ret = 0, post_ret = 0;
|
|
|
|
pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx"
|
|
" CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]);
|
|
pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
|
|
cmd->se_tfo->get_cmd_state(cmd),
|
|
cmd->t_state, 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
|
|
*/
|
|
transport_complete_task_attr(cmd);
|
|
/*
|
|
* Handle special case for COMPARE_AND_WRITE failure, where the
|
|
* callback is expected to drop the per device ->caw_sem.
|
|
*/
|
|
if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
|
|
cmd->transport_complete_callback)
|
|
cmd->transport_complete_callback(cmd, false, &post_ret);
|
|
|
|
switch (sense_reason) {
|
|
case TCM_NON_EXISTENT_LUN:
|
|
case TCM_UNSUPPORTED_SCSI_OPCODE:
|
|
case TCM_INVALID_CDB_FIELD:
|
|
case TCM_INVALID_PARAMETER_LIST:
|
|
case TCM_PARAMETER_LIST_LENGTH_ERROR:
|
|
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:
|
|
case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
|
|
case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
|
|
case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
|
|
break;
|
|
case TCM_OUT_OF_RESOURCES:
|
|
sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
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->dev_attrib.emulate_ua_intlck_ctrl == 2) {
|
|
target_ua_allocate_lun(cmd->se_sess->se_node_acl,
|
|
cmd->orig_fe_lun, 0x2C,
|
|
ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
|
|
}
|
|
trace_target_cmd_complete(cmd);
|
|
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], sense_reason);
|
|
sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
|
|
break;
|
|
}
|
|
|
|
ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
|
|
if (ret == -EAGAIN || ret == -ENOMEM)
|
|
goto queue_full;
|
|
|
|
check_stop:
|
|
transport_lun_remove_cmd(cmd);
|
|
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);
|
|
|
|
void __target_execute_cmd(struct se_cmd *cmd)
|
|
{
|
|
sense_reason_t ret;
|
|
|
|
if (cmd->execute_cmd) {
|
|
ret = cmd->execute_cmd(cmd);
|
|
if (ret) {
|
|
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, ret);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int target_write_prot_action(struct se_cmd *cmd)
|
|
{
|
|
u32 sectors;
|
|
/*
|
|
* Perform WRITE_INSERT of PI using software emulation when backend
|
|
* device has PI enabled, if the transport has not already generated
|
|
* PI using hardware WRITE_INSERT offload.
|
|
*/
|
|
switch (cmd->prot_op) {
|
|
case TARGET_PROT_DOUT_INSERT:
|
|
if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
|
|
sbc_dif_generate(cmd);
|
|
break;
|
|
case TARGET_PROT_DOUT_STRIP:
|
|
if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
|
|
break;
|
|
|
|
sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
|
|
cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
|
|
sectors, 0, cmd->t_prot_sg, 0);
|
|
if (unlikely(cmd->pi_err)) {
|
|
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, cmd->pi_err);
|
|
return -1;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool target_handle_task_attr(struct se_cmd *cmd)
|
|
{
|
|
struct se_device *dev = cmd->se_dev;
|
|
|
|
if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
|
|
return false;
|
|
|
|
/*
|
|
* 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 TCM_HEAD_TAG:
|
|
pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x\n",
|
|
cmd->t_task_cdb[0]);
|
|
return false;
|
|
case TCM_ORDERED_TAG:
|
|
atomic_inc_mb(&dev->dev_ordered_sync);
|
|
|
|
pr_debug("Added ORDERED for CDB: 0x%02x to ordered list\n",
|
|
cmd->t_task_cdb[0]);
|
|
|
|
/*
|
|
* Execute an ORDERED command if no other older commands
|
|
* exist that need to be completed first.
|
|
*/
|
|
if (!atomic_read(&dev->simple_cmds))
|
|
return false;
|
|
break;
|
|
default:
|
|
/*
|
|
* For SIMPLE and UNTAGGED Task Attribute commands
|
|
*/
|
|
atomic_inc_mb(&dev->simple_cmds);
|
|
break;
|
|
}
|
|
|
|
if (atomic_read(&dev->dev_ordered_sync) == 0)
|
|
return false;
|
|
|
|
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 listn",
|
|
cmd->t_task_cdb[0], cmd->sam_task_attr);
|
|
return true;
|
|
}
|
|
|
|
static int __transport_check_aborted_status(struct se_cmd *, int);
|
|
|
|
void target_execute_cmd(struct se_cmd *cmd)
|
|
{
|
|
/*
|
|
* Determine if frontend context caller is requesting the stopping of
|
|
* this command for frontend exceptions.
|
|
*
|
|
* If the received CDB has aleady been aborted stop processing it here.
|
|
*/
|
|
spin_lock_irq(&cmd->t_state_lock);
|
|
if (__transport_check_aborted_status(cmd, 1)) {
|
|
spin_unlock_irq(&cmd->t_state_lock);
|
|
return;
|
|
}
|
|
if (cmd->transport_state & CMD_T_STOP) {
|
|
pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
|
|
__func__, __LINE__, cmd->tag);
|
|
|
|
spin_unlock_irq(&cmd->t_state_lock);
|
|
complete_all(&cmd->t_transport_stop_comp);
|
|
return;
|
|
}
|
|
|
|
cmd->t_state = TRANSPORT_PROCESSING;
|
|
cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
|
|
spin_unlock_irq(&cmd->t_state_lock);
|
|
|
|
if (target_write_prot_action(cmd))
|
|
return;
|
|
|
|
if (target_handle_task_attr(cmd)) {
|
|
spin_lock_irq(&cmd->t_state_lock);
|
|
cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT);
|
|
spin_unlock_irq(&cmd->t_state_lock);
|
|
return;
|
|
}
|
|
|
|
__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 == TCM_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 (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
|
|
return;
|
|
|
|
if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
|
|
atomic_dec_mb(&dev->simple_cmds);
|
|
dev->dev_cur_ordered_id++;
|
|
pr_debug("Incremented dev->dev_cur_ordered_id: %u for SIMPLE\n",
|
|
dev->dev_cur_ordered_id);
|
|
} else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
|
|
dev->dev_cur_ordered_id++;
|
|
pr_debug("Incremented dev_cur_ordered_id: %u for HEAD_OF_QUEUE\n",
|
|
dev->dev_cur_ordered_id);
|
|
} else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
|
|
atomic_dec_mb(&dev->dev_ordered_sync);
|
|
|
|
dev->dev_cur_ordered_id++;
|
|
pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n",
|
|
dev->dev_cur_ordered_id);
|
|
}
|
|
|
|
target_restart_delayed_cmds(dev);
|
|
}
|
|
|
|
static void transport_complete_qf(struct se_cmd *cmd)
|
|
{
|
|
int ret = 0;
|
|
|
|
transport_complete_task_attr(cmd);
|
|
|
|
if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
|
|
trace_target_cmd_complete(cmd);
|
|
ret = cmd->se_tfo->queue_status(cmd);
|
|
goto out;
|
|
}
|
|
|
|
switch (cmd->data_direction) {
|
|
case DMA_FROM_DEVICE:
|
|
if (cmd->scsi_status)
|
|
goto queue_status;
|
|
|
|
trace_target_cmd_complete(cmd);
|
|
ret = cmd->se_tfo->queue_data_in(cmd);
|
|
break;
|
|
case DMA_TO_DEVICE:
|
|
if (cmd->se_cmd_flags & SCF_BIDI) {
|
|
ret = cmd->se_tfo->queue_data_in(cmd);
|
|
break;
|
|
}
|
|
/* Fall through for DMA_TO_DEVICE */
|
|
case DMA_NONE:
|
|
queue_status:
|
|
trace_target_cmd_complete(cmd);
|
|
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_mb(&dev->dev_qf_count);
|
|
spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
|
|
|
|
schedule_work(&cmd->se_dev->qf_work_queue);
|
|
}
|
|
|
|
static bool target_read_prot_action(struct se_cmd *cmd)
|
|
{
|
|
switch (cmd->prot_op) {
|
|
case TARGET_PROT_DIN_STRIP:
|
|
if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
|
|
u32 sectors = cmd->data_length >>
|
|
ilog2(cmd->se_dev->dev_attrib.block_size);
|
|
|
|
cmd->pi_err = sbc_dif_verify(cmd, cmd->t_task_lba,
|
|
sectors, 0, cmd->t_prot_sg,
|
|
0);
|
|
if (cmd->pi_err)
|
|
return true;
|
|
}
|
|
break;
|
|
case TARGET_PROT_DIN_INSERT:
|
|
if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
|
|
break;
|
|
|
|
sbc_dif_generate(cmd);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
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.
|
|
*/
|
|
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 and COMPARE_AND_WRITE emulation.
|
|
*/
|
|
if (cmd->transport_complete_callback) {
|
|
sense_reason_t rc;
|
|
bool caw = (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE);
|
|
bool zero_dl = !(cmd->data_length);
|
|
int post_ret = 0;
|
|
|
|
rc = cmd->transport_complete_callback(cmd, true, &post_ret);
|
|
if (!rc && !post_ret) {
|
|
if (caw && zero_dl)
|
|
goto queue_rsp;
|
|
|
|
return;
|
|
} else if (rc) {
|
|
ret = transport_send_check_condition_and_sense(cmd,
|
|
rc, 0);
|
|
if (ret == -EAGAIN || ret == -ENOMEM)
|
|
goto queue_full;
|
|
|
|
transport_lun_remove_cmd(cmd);
|
|
transport_cmd_check_stop_to_fabric(cmd);
|
|
return;
|
|
}
|
|
}
|
|
|
|
queue_rsp:
|
|
switch (cmd->data_direction) {
|
|
case DMA_FROM_DEVICE:
|
|
if (cmd->scsi_status)
|
|
goto queue_status;
|
|
|
|
atomic_long_add(cmd->data_length,
|
|
&cmd->se_lun->lun_stats.tx_data_octets);
|
|
/*
|
|
* Perform READ_STRIP of PI using software emulation when
|
|
* backend had PI enabled, if the transport will not be
|
|
* performing hardware READ_STRIP offload.
|
|
*/
|
|
if (target_read_prot_action(cmd)) {
|
|
ret = transport_send_check_condition_and_sense(cmd,
|
|
cmd->pi_err, 0);
|
|
if (ret == -EAGAIN || ret == -ENOMEM)
|
|
goto queue_full;
|
|
|
|
transport_lun_remove_cmd(cmd);
|
|
transport_cmd_check_stop_to_fabric(cmd);
|
|
return;
|
|
}
|
|
|
|
trace_target_cmd_complete(cmd);
|
|
ret = cmd->se_tfo->queue_data_in(cmd);
|
|
if (ret == -EAGAIN || ret == -ENOMEM)
|
|
goto queue_full;
|
|
break;
|
|
case DMA_TO_DEVICE:
|
|
atomic_long_add(cmd->data_length,
|
|
&cmd->se_lun->lun_stats.rx_data_octets);
|
|
/*
|
|
* Check if we need to send READ payload for BIDI-COMMAND
|
|
*/
|
|
if (cmd->se_cmd_flags & SCF_BIDI) {
|
|
atomic_long_add(cmd->data_length,
|
|
&cmd->se_lun->lun_stats.tx_data_octets);
|
|
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:
|
|
queue_status:
|
|
trace_target_cmd_complete(cmd);
|
|
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);
|
|
}
|
|
|
|
void target_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);
|
|
}
|
|
EXPORT_SYMBOL(target_free_sgl);
|
|
|
|
static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
|
|
{
|
|
/*
|
|
* Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
|
|
* emulation, and free + reset pointers if necessary..
|
|
*/
|
|
if (!cmd->t_data_sg_orig)
|
|
return;
|
|
|
|
kfree(cmd->t_data_sg);
|
|
cmd->t_data_sg = cmd->t_data_sg_orig;
|
|
cmd->t_data_sg_orig = NULL;
|
|
cmd->t_data_nents = cmd->t_data_nents_orig;
|
|
cmd->t_data_nents_orig = 0;
|
|
}
|
|
|
|
static inline void transport_free_pages(struct se_cmd *cmd)
|
|
{
|
|
if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
|
|
target_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
|
|
cmd->t_prot_sg = NULL;
|
|
cmd->t_prot_nents = 0;
|
|
}
|
|
|
|
if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
|
|
/*
|
|
* Release special case READ buffer payload required for
|
|
* SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
|
|
*/
|
|
if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
|
|
target_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_reset_sgl_orig(cmd);
|
|
return;
|
|
}
|
|
transport_reset_sgl_orig(cmd);
|
|
|
|
target_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
|
|
cmd->t_data_sg = NULL;
|
|
cmd->t_data_nents = 0;
|
|
|
|
target_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_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 int transport_put_cmd(struct se_cmd *cmd)
|
|
{
|
|
BUG_ON(!cmd->se_tfo);
|
|
/*
|
|
* If this cmd has been setup with target_get_sess_cmd(), drop
|
|
* the kref and call ->release_cmd() in kref callback.
|
|
*/
|
|
return target_put_sess_cmd(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)
|
|
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)
|
|
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);
|
|
|
|
int
|
|
target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
|
|
bool zero_page, bool chainable)
|
|
{
|
|
struct scatterlist *sg;
|
|
struct page *page;
|
|
gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
|
|
unsigned int nalloc, nent;
|
|
int i = 0;
|
|
|
|
nalloc = nent = DIV_ROUND_UP(length, PAGE_SIZE);
|
|
if (chainable)
|
|
nalloc++;
|
|
sg = kmalloc_array(nalloc, sizeof(struct scatterlist), GFP_KERNEL);
|
|
if (!sg)
|
|
return -ENOMEM;
|
|
|
|
sg_init_table(sg, nalloc);
|
|
|
|
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(&sg[i], page, page_len, 0);
|
|
length -= page_len;
|
|
i++;
|
|
}
|
|
*sgl = sg;
|
|
*nents = nent;
|
|
return 0;
|
|
|
|
out:
|
|
while (i > 0) {
|
|
i--;
|
|
__free_page(sg_page(&sg[i]));
|
|
}
|
|
kfree(sg);
|
|
return -ENOMEM;
|
|
}
|
|
EXPORT_SYMBOL(target_alloc_sgl);
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
sense_reason_t
|
|
transport_generic_new_cmd(struct se_cmd *cmd)
|
|
{
|
|
int ret = 0;
|
|
bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
|
|
|
|
if (cmd->prot_op != TARGET_PROT_NORMAL &&
|
|
!(cmd->se_cmd_flags & SCF_PASSTHROUGH_PROT_SG_TO_MEM_NOALLOC)) {
|
|
ret = target_alloc_sgl(&cmd->t_prot_sg, &cmd->t_prot_nents,
|
|
cmd->prot_length, true, false);
|
|
if (ret < 0)
|
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
}
|
|
|
|
/*
|
|
* 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) {
|
|
|
|
if ((cmd->se_cmd_flags & SCF_BIDI) ||
|
|
(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
|
|
u32 bidi_length;
|
|
|
|
if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
|
|
bidi_length = cmd->t_task_nolb *
|
|
cmd->se_dev->dev_attrib.block_size;
|
|
else
|
|
bidi_length = cmd->data_length;
|
|
|
|
ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
|
|
&cmd->t_bidi_data_nents,
|
|
bidi_length, zero_flag, false);
|
|
if (ret < 0)
|
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
}
|
|
|
|
ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
|
|
cmd->data_length, zero_flag, false);
|
|
if (ret < 0)
|
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
} else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
|
|
cmd->data_length) {
|
|
/*
|
|
* Special case for COMPARE_AND_WRITE with fabrics
|
|
* using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
|
|
*/
|
|
u32 caw_length = cmd->t_task_nolb *
|
|
cmd->se_dev->dev_attrib.block_size;
|
|
|
|
ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
|
|
&cmd->t_bidi_data_nents,
|
|
caw_length, zero_flag, false);
|
|
if (ret < 0)
|
|
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
}
|
|
/*
|
|
* 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 || cmd->data_length == 0) {
|
|
target_execute_cmd(cmd);
|
|
return 0;
|
|
}
|
|
transport_cmd_check_stop(cmd, false, true);
|
|
|
|
ret = cmd->se_tfo->write_pending(cmd);
|
|
if (ret == -EAGAIN || ret == -ENOMEM)
|
|
goto queue_full;
|
|
|
|
/* fabric drivers should only return -EAGAIN or -ENOMEM as error */
|
|
WARN_ON(ret);
|
|
|
|
return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
static bool
|
|
__transport_wait_for_tasks(struct se_cmd *, bool, bool *, bool *,
|
|
unsigned long *flags);
|
|
|
|
static void target_wait_free_cmd(struct se_cmd *cmd, bool *aborted, bool *tas)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
__transport_wait_for_tasks(cmd, true, aborted, tas, &flags);
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
}
|
|
|
|
int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
|
|
{
|
|
int ret = 0;
|
|
bool aborted = false, tas = false;
|
|
|
|
if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
|
|
if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
|
|
target_wait_free_cmd(cmd, &aborted, &tas);
|
|
|
|
if (!aborted || tas)
|
|
ret = transport_put_cmd(cmd);
|
|
} else {
|
|
if (wait_for_tasks)
|
|
target_wait_free_cmd(cmd, &aborted, &tas);
|
|
/*
|
|
* Handle WRITE failure case where transport_generic_new_cmd()
|
|
* has already added se_cmd to state_list, but fabric has
|
|
* failed command before I/O submission.
|
|
*/
|
|
if (cmd->state_active)
|
|
target_remove_from_state_list(cmd);
|
|
|
|
if (cmd->se_lun)
|
|
transport_lun_remove_cmd(cmd);
|
|
|
|
if (!aborted || tas)
|
|
ret = transport_put_cmd(cmd);
|
|
}
|
|
/*
|
|
* If the task has been internally aborted due to TMR ABORT_TASK
|
|
* or LUN_RESET, target_core_tmr.c is responsible for performing
|
|
* the remaining calls to target_put_sess_cmd(), and not the
|
|
* callers of this function.
|
|
*/
|
|
if (aborted) {
|
|
pr_debug("Detected CMD_T_ABORTED for ITT: %llu\n", cmd->tag);
|
|
wait_for_completion(&cmd->cmd_wait_comp);
|
|
cmd->se_tfo->release_cmd(cmd);
|
|
ret = 1;
|
|
}
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(transport_generic_free_cmd);
|
|
|
|
/* target_get_sess_cmd - Add command to active ->sess_cmd_list
|
|
* @se_cmd: command descriptor to add
|
|
* @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
|
|
*/
|
|
int target_get_sess_cmd(struct se_cmd *se_cmd, bool ack_kref)
|
|
{
|
|
struct se_session *se_sess = se_cmd->se_sess;
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
|
|
/*
|
|
* 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)
|
|
kref_get(&se_cmd->cmd_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);
|
|
out:
|
|
spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
|
|
|
|
if (ret && ack_kref)
|
|
target_put_sess_cmd(se_cmd);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(target_get_sess_cmd);
|
|
|
|
static void target_free_cmd_mem(struct se_cmd *cmd)
|
|
{
|
|
transport_free_pages(cmd);
|
|
|
|
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);
|
|
}
|
|
|
|
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;
|
|
bool fabric_stop;
|
|
|
|
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);
|
|
target_free_cmd_mem(se_cmd);
|
|
se_cmd->se_tfo->release_cmd(se_cmd);
|
|
return;
|
|
}
|
|
|
|
spin_lock(&se_cmd->t_state_lock);
|
|
fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP);
|
|
spin_unlock(&se_cmd->t_state_lock);
|
|
|
|
if (se_cmd->cmd_wait_set || fabric_stop) {
|
|
list_del_init(&se_cmd->se_cmd_list);
|
|
spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
|
|
target_free_cmd_mem(se_cmd);
|
|
complete(&se_cmd->cmd_wait_comp);
|
|
return;
|
|
}
|
|
list_del_init(&se_cmd->se_cmd_list);
|
|
spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
|
|
|
|
target_free_cmd_mem(se_cmd);
|
|
se_cmd->se_tfo->release_cmd(se_cmd);
|
|
}
|
|
|
|
/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
|
|
* @se_cmd: command descriptor to drop
|
|
*/
|
|
int target_put_sess_cmd(struct se_cmd *se_cmd)
|
|
{
|
|
struct se_session *se_sess = se_cmd->se_sess;
|
|
|
|
if (!se_sess) {
|
|
target_free_cmd_mem(se_cmd);
|
|
se_cmd->se_tfo->release_cmd(se_cmd);
|
|
return 1;
|
|
}
|
|
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;
|
|
int rc;
|
|
|
|
spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
|
|
if (se_sess->sess_tearing_down) {
|
|
spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
|
|
return;
|
|
}
|
|
se_sess->sess_tearing_down = 1;
|
|
list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
|
|
|
|
list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list) {
|
|
rc = kref_get_unless_zero(&se_cmd->cmd_kref);
|
|
if (rc) {
|
|
se_cmd->cmd_wait_set = 1;
|
|
spin_lock(&se_cmd->t_state_lock);
|
|
se_cmd->transport_state |= CMD_T_FABRIC_STOP;
|
|
spin_unlock(&se_cmd->t_state_lock);
|
|
}
|
|
}
|
|
|
|
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
|
|
*/
|
|
void target_wait_for_sess_cmds(struct se_session *se_sess)
|
|
{
|
|
struct se_cmd *se_cmd, *tmp_cmd;
|
|
unsigned long flags;
|
|
bool tas;
|
|
|
|
list_for_each_entry_safe(se_cmd, tmp_cmd,
|
|
&se_sess->sess_wait_list, 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));
|
|
|
|
spin_lock_irqsave(&se_cmd->t_state_lock, flags);
|
|
tas = (se_cmd->transport_state & CMD_T_TAS);
|
|
spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
|
|
|
|
if (!target_put_sess_cmd(se_cmd)) {
|
|
if (tas)
|
|
target_put_sess_cmd(se_cmd);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
|
|
WARN_ON(!list_empty(&se_sess->sess_cmd_list));
|
|
spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
|
|
|
|
}
|
|
EXPORT_SYMBOL(target_wait_for_sess_cmds);
|
|
|
|
void transport_clear_lun_ref(struct se_lun *lun)
|
|
{
|
|
percpu_ref_kill(&lun->lun_ref);
|
|
wait_for_completion(&lun->lun_ref_comp);
|
|
}
|
|
|
|
static bool
|
|
__transport_wait_for_tasks(struct se_cmd *cmd, bool fabric_stop,
|
|
bool *aborted, bool *tas, unsigned long *flags)
|
|
__releases(&cmd->t_state_lock)
|
|
__acquires(&cmd->t_state_lock)
|
|
{
|
|
|
|
assert_spin_locked(&cmd->t_state_lock);
|
|
WARN_ON_ONCE(!irqs_disabled());
|
|
|
|
if (fabric_stop)
|
|
cmd->transport_state |= CMD_T_FABRIC_STOP;
|
|
|
|
if (cmd->transport_state & CMD_T_ABORTED)
|
|
*aborted = true;
|
|
|
|
if (cmd->transport_state & CMD_T_TAS)
|
|
*tas = true;
|
|
|
|
if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
|
|
!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
|
|
return false;
|
|
|
|
if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
|
|
!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
|
|
return false;
|
|
|
|
if (!(cmd->transport_state & CMD_T_ACTIVE))
|
|
return false;
|
|
|
|
if (fabric_stop && *aborted)
|
|
return false;
|
|
|
|
cmd->transport_state |= CMD_T_STOP;
|
|
|
|
pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d,"
|
|
" t_state: %d, CMD_T_STOP\n", cmd, cmd->tag,
|
|
cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
|
|
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
|
|
|
|
wait_for_completion(&cmd->t_transport_stop_comp);
|
|
|
|
spin_lock_irqsave(&cmd->t_state_lock, *flags);
|
|
cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
|
|
|
|
pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->"
|
|
"t_transport_stop_comp) for ITT: 0x%08llx\n", cmd->tag);
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* transport_wait_for_tasks - wait for completion to occur
|
|
* @cmd: command to wait
|
|
*
|
|
* Called from frontend fabric context to wait for storage engine
|
|
* to pause and/or release frontend generated struct se_cmd.
|
|
*/
|
|
bool transport_wait_for_tasks(struct se_cmd *cmd)
|
|
{
|
|
unsigned long flags;
|
|
bool ret, aborted = false, tas = false;
|
|
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
ret = __transport_wait_for_tasks(cmd, false, &aborted, &tas, &flags);
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(transport_wait_for_tasks);
|
|
|
|
struct sense_info {
|
|
u8 key;
|
|
u8 asc;
|
|
u8 ascq;
|
|
bool add_sector_info;
|
|
};
|
|
|
|
static const struct sense_info sense_info_table[] = {
|
|
[TCM_NO_SENSE] = {
|
|
.key = NOT_READY
|
|
},
|
|
[TCM_NON_EXISTENT_LUN] = {
|
|
.key = ILLEGAL_REQUEST,
|
|
.asc = 0x25 /* LOGICAL UNIT NOT SUPPORTED */
|
|
},
|
|
[TCM_UNSUPPORTED_SCSI_OPCODE] = {
|
|
.key = ILLEGAL_REQUEST,
|
|
.asc = 0x20, /* INVALID COMMAND OPERATION CODE */
|
|
},
|
|
[TCM_SECTOR_COUNT_TOO_MANY] = {
|
|
.key = ILLEGAL_REQUEST,
|
|
.asc = 0x20, /* INVALID COMMAND OPERATION CODE */
|
|
},
|
|
[TCM_UNKNOWN_MODE_PAGE] = {
|
|
.key = ILLEGAL_REQUEST,
|
|
.asc = 0x24, /* INVALID FIELD IN CDB */
|
|
},
|
|
[TCM_CHECK_CONDITION_ABORT_CMD] = {
|
|
.key = ABORTED_COMMAND,
|
|
.asc = 0x29, /* BUS DEVICE RESET FUNCTION OCCURRED */
|
|
.ascq = 0x03,
|
|
},
|
|
[TCM_INCORRECT_AMOUNT_OF_DATA] = {
|
|
.key = ABORTED_COMMAND,
|
|
.asc = 0x0c, /* WRITE ERROR */
|
|
.ascq = 0x0d, /* NOT ENOUGH UNSOLICITED DATA */
|
|
},
|
|
[TCM_INVALID_CDB_FIELD] = {
|
|
.key = ILLEGAL_REQUEST,
|
|
.asc = 0x24, /* INVALID FIELD IN CDB */
|
|
},
|
|
[TCM_INVALID_PARAMETER_LIST] = {
|
|
.key = ILLEGAL_REQUEST,
|
|
.asc = 0x26, /* INVALID FIELD IN PARAMETER LIST */
|
|
},
|
|
[TCM_PARAMETER_LIST_LENGTH_ERROR] = {
|
|
.key = ILLEGAL_REQUEST,
|
|
.asc = 0x1a, /* PARAMETER LIST LENGTH ERROR */
|
|
},
|
|
[TCM_UNEXPECTED_UNSOLICITED_DATA] = {
|
|
.key = ILLEGAL_REQUEST,
|
|
.asc = 0x0c, /* WRITE ERROR */
|
|
.ascq = 0x0c, /* UNEXPECTED_UNSOLICITED_DATA */
|
|
},
|
|
[TCM_SERVICE_CRC_ERROR] = {
|
|
.key = ABORTED_COMMAND,
|
|
.asc = 0x47, /* PROTOCOL SERVICE CRC ERROR */
|
|
.ascq = 0x05, /* N/A */
|
|
},
|
|
[TCM_SNACK_REJECTED] = {
|
|
.key = ABORTED_COMMAND,
|
|
.asc = 0x11, /* READ ERROR */
|
|
.ascq = 0x13, /* FAILED RETRANSMISSION REQUEST */
|
|
},
|
|
[TCM_WRITE_PROTECTED] = {
|
|
.key = DATA_PROTECT,
|
|
.asc = 0x27, /* WRITE PROTECTED */
|
|
},
|
|
[TCM_ADDRESS_OUT_OF_RANGE] = {
|
|
.key = ILLEGAL_REQUEST,
|
|
.asc = 0x21, /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
|
|
},
|
|
[TCM_CHECK_CONDITION_UNIT_ATTENTION] = {
|
|
.key = UNIT_ATTENTION,
|
|
},
|
|
[TCM_CHECK_CONDITION_NOT_READY] = {
|
|
.key = NOT_READY,
|
|
},
|
|
[TCM_MISCOMPARE_VERIFY] = {
|
|
.key = MISCOMPARE,
|
|
.asc = 0x1d, /* MISCOMPARE DURING VERIFY OPERATION */
|
|
.ascq = 0x00,
|
|
},
|
|
[TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED] = {
|
|
.key = ABORTED_COMMAND,
|
|
.asc = 0x10,
|
|
.ascq = 0x01, /* LOGICAL BLOCK GUARD CHECK FAILED */
|
|
.add_sector_info = true,
|
|
},
|
|
[TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED] = {
|
|
.key = ABORTED_COMMAND,
|
|
.asc = 0x10,
|
|
.ascq = 0x02, /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
|
|
.add_sector_info = true,
|
|
},
|
|
[TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED] = {
|
|
.key = ABORTED_COMMAND,
|
|
.asc = 0x10,
|
|
.ascq = 0x03, /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
|
|
.add_sector_info = true,
|
|
},
|
|
[TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE] = {
|
|
/*
|
|
* Returning ILLEGAL REQUEST would cause immediate IO errors on
|
|
* Solaris initiators. Returning NOT READY instead means the
|
|
* operations will be retried a finite number of times and we
|
|
* can survive intermittent errors.
|
|
*/
|
|
.key = NOT_READY,
|
|
.asc = 0x08, /* LOGICAL UNIT COMMUNICATION FAILURE */
|
|
},
|
|
};
|
|
|
|
static int translate_sense_reason(struct se_cmd *cmd, sense_reason_t reason)
|
|
{
|
|
const struct sense_info *si;
|
|
u8 *buffer = cmd->sense_buffer;
|
|
int r = (__force int)reason;
|
|
u8 asc, ascq;
|
|
bool desc_format = target_sense_desc_format(cmd->se_dev);
|
|
|
|
if (r < ARRAY_SIZE(sense_info_table) && sense_info_table[r].key)
|
|
si = &sense_info_table[r];
|
|
else
|
|
si = &sense_info_table[(__force int)
|
|
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE];
|
|
|
|
if (reason == TCM_CHECK_CONDITION_UNIT_ATTENTION) {
|
|
core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
|
|
WARN_ON_ONCE(asc == 0);
|
|
} else if (si->asc == 0) {
|
|
WARN_ON_ONCE(cmd->scsi_asc == 0);
|
|
asc = cmd->scsi_asc;
|
|
ascq = cmd->scsi_ascq;
|
|
} else {
|
|
asc = si->asc;
|
|
ascq = si->ascq;
|
|
}
|
|
|
|
scsi_build_sense_buffer(desc_format, buffer, si->key, asc, ascq);
|
|
if (si->add_sector_info)
|
|
return scsi_set_sense_information(buffer,
|
|
cmd->scsi_sense_length,
|
|
cmd->bad_sector);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
transport_send_check_condition_and_sense(struct se_cmd *cmd,
|
|
sense_reason_t reason, int from_transport)
|
|
{
|
|
unsigned long flags;
|
|
|
|
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;
|
|
}
|
|
cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
if (!from_transport) {
|
|
int rc;
|
|
|
|
cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
|
|
cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
|
|
cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
|
|
rc = translate_sense_reason(cmd, reason);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
trace_target_cmd_complete(cmd);
|
|
return cmd->se_tfo->queue_status(cmd);
|
|
}
|
|
EXPORT_SYMBOL(transport_send_check_condition_and_sense);
|
|
|
|
static int __transport_check_aborted_status(struct se_cmd *cmd, int send_status)
|
|
__releases(&cmd->t_state_lock)
|
|
__acquires(&cmd->t_state_lock)
|
|
{
|
|
assert_spin_locked(&cmd->t_state_lock);
|
|
WARN_ON_ONCE(!irqs_disabled());
|
|
|
|
if (!(cmd->transport_state & CMD_T_ABORTED))
|
|
return 0;
|
|
/*
|
|
* If cmd has been aborted but either no status is to be sent or it has
|
|
* already been sent, just return
|
|
*/
|
|
if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS)) {
|
|
if (send_status)
|
|
cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
|
|
return 1;
|
|
}
|
|
|
|
pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB:"
|
|
" 0x%02x ITT: 0x%08llx\n", cmd->t_task_cdb[0], cmd->tag);
|
|
|
|
cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
|
|
cmd->scsi_status = SAM_STAT_TASK_ABORTED;
|
|
trace_target_cmd_complete(cmd);
|
|
|
|
spin_unlock_irq(&cmd->t_state_lock);
|
|
cmd->se_tfo->queue_status(cmd);
|
|
spin_lock_irq(&cmd->t_state_lock);
|
|
|
|
return 1;
|
|
}
|
|
|
|
int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
|
|
{
|
|
int ret;
|
|
|
|
spin_lock_irq(&cmd->t_state_lock);
|
|
ret = __transport_check_aborted_status(cmd, send_status);
|
|
spin_unlock_irq(&cmd->t_state_lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(transport_check_aborted_status);
|
|
|
|
void transport_send_task_abort(struct se_cmd *cmd)
|
|
{
|
|
unsigned long flags;
|
|
|
|
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;
|
|
}
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
/*
|
|
* If there are still expected incoming fabric WRITEs, we wait
|
|
* until until they have completed before sending a TASK_ABORTED
|
|
* response. This response with TASK_ABORTED status will be
|
|
* queued back to fabric module by transport_check_aborted_status().
|
|
*/
|
|
if (cmd->data_direction == DMA_TO_DEVICE) {
|
|
if (cmd->se_tfo->write_pending_status(cmd) != 0) {
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
if (cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS) {
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
goto send_abort;
|
|
}
|
|
cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
return;
|
|
}
|
|
}
|
|
send_abort:
|
|
cmd->scsi_status = SAM_STAT_TASK_ABORTED;
|
|
|
|
transport_lun_remove_cmd(cmd);
|
|
|
|
pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
|
|
cmd->t_task_cdb[0], cmd->tag);
|
|
|
|
trace_target_cmd_complete(cmd);
|
|
cmd->se_tfo->queue_status(cmd);
|
|
}
|
|
|
|
static void target_tmr_work(struct work_struct *work)
|
|
{
|
|
struct se_cmd *cmd = container_of(work, struct se_cmd, work);
|
|
struct se_device *dev = cmd->se_dev;
|
|
struct se_tmr_req *tmr = cmd->se_tmr_req;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
if (cmd->transport_state & CMD_T_ABORTED) {
|
|
tmr->response = TMR_FUNCTION_REJECTED;
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
goto check_stop;
|
|
}
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
switch (tmr->function) {
|
|
case TMR_ABORT_TASK:
|
|
core_tmr_abort_task(dev, tmr, cmd->se_sess);
|
|
break;
|
|
case TMR_ABORT_TASK_SET:
|
|
case TMR_CLEAR_ACA:
|
|
case TMR_CLEAR_TASK_SET:
|
|
tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
|
|
break;
|
|
case TMR_LUN_RESET:
|
|
ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
|
|
tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
|
|
TMR_FUNCTION_REJECTED;
|
|
if (tmr->response == TMR_FUNCTION_COMPLETE) {
|
|
target_ua_allocate_lun(cmd->se_sess->se_node_acl,
|
|
cmd->orig_fe_lun, 0x29,
|
|
ASCQ_29H_BUS_DEVICE_RESET_FUNCTION_OCCURRED);
|
|
}
|
|
break;
|
|
case TMR_TARGET_WARM_RESET:
|
|
tmr->response = TMR_FUNCTION_REJECTED;
|
|
break;
|
|
case TMR_TARGET_COLD_RESET:
|
|
tmr->response = TMR_FUNCTION_REJECTED;
|
|
break;
|
|
default:
|
|
pr_err("Uknown TMR function: 0x%02x.\n",
|
|
tmr->function);
|
|
tmr->response = TMR_FUNCTION_REJECTED;
|
|
break;
|
|
}
|
|
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
if (cmd->transport_state & CMD_T_ABORTED) {
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
goto check_stop;
|
|
}
|
|
cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
cmd->se_tfo->queue_tm_rsp(cmd);
|
|
|
|
check_stop:
|
|
transport_cmd_check_stop_to_fabric(cmd);
|
|
}
|
|
|
|
int transport_generic_handle_tmr(
|
|
struct se_cmd *cmd)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
cmd->transport_state |= CMD_T_ACTIVE;
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
INIT_WORK(&cmd->work, target_tmr_work);
|
|
queue_work(cmd->se_dev->tmr_wq, &cmd->work);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(transport_generic_handle_tmr);
|
|
|
|
bool
|
|
target_check_wce(struct se_device *dev)
|
|
{
|
|
bool wce = false;
|
|
|
|
if (dev->transport->get_write_cache)
|
|
wce = dev->transport->get_write_cache(dev);
|
|
else if (dev->dev_attrib.emulate_write_cache > 0)
|
|
wce = true;
|
|
|
|
return wce;
|
|
}
|
|
|
|
bool
|
|
target_check_fua(struct se_device *dev)
|
|
{
|
|
return target_check_wce(dev) && dev->dev_attrib.emulate_fua_write > 0;
|
|
}
|