#include <scsi/scsi_tcq.h>
#include <target/target_core_base.h>
-#include <target/target_core_device.h>
-#include <target/target_core_tmr.h>
-#include <target/target_core_tpg.h>
-#include <target/target_core_transport.h>
-#include <target/target_core_fabric_ops.h>
+#include <target/target_core_backend.h>
+#include <target/target_core_fabric.h>
#include <target/target_core_configfs.h>
+#include "target_core_internal.h"
#include "target_core_alua.h"
-#include "target_core_cdb.h"
-#include "target_core_hba.h"
#include "target_core_pr.h"
#include "target_core_ua.h"
static int sub_api_initialized;
static struct workqueue_struct *target_completion_wq;
-static struct kmem_cache *se_cmd_cache;
static struct kmem_cache *se_sess_cache;
struct kmem_cache *se_tmr_req_cache;
struct kmem_cache *se_ua_cache;
static int transport_generic_write_pending(struct se_cmd *);
static int transport_processing_thread(void *param);
-static int __transport_execute_tasks(struct se_device *dev);
+static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *);
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 void transport_put_cmd(struct se_cmd *cmd);
static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
-static void transport_generic_request_failure(struct se_cmd *, int, int);
+static void transport_generic_request_failure(struct se_cmd *);
static void target_complete_ok_work(struct work_struct *work);
int init_se_kmem_caches(void)
{
- se_cmd_cache = kmem_cache_create("se_cmd_cache",
- sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL);
- if (!se_cmd_cache) {
- pr_err("kmem_cache_create for struct se_cmd failed\n");
- goto out;
- }
se_tmr_req_cache = kmem_cache_create("se_tmr_cache",
sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req),
0, NULL);
if (!se_tmr_req_cache) {
pr_err("kmem_cache_create() for struct se_tmr_req"
" failed\n");
- goto out_free_cmd_cache;
+ goto out;
}
se_sess_cache = kmem_cache_create("se_sess_cache",
sizeof(struct se_session), __alignof__(struct se_session),
kmem_cache_destroy(se_sess_cache);
out_free_tmr_req_cache:
kmem_cache_destroy(se_tmr_req_cache);
-out_free_cmd_cache:
- kmem_cache_destroy(se_cmd_cache);
out:
return -ENOMEM;
}
void release_se_kmem_caches(void)
{
destroy_workqueue(target_completion_wq);
- kmem_cache_destroy(se_cmd_cache);
kmem_cache_destroy(se_tmr_req_cache);
kmem_cache_destroy(se_sess_cache);
kmem_cache_destroy(se_ua_cache);
return new_index;
}
-void transport_init_queue_obj(struct se_queue_obj *qobj)
+static void transport_init_queue_obj(struct se_queue_obj *qobj)
{
atomic_set(&qobj->queue_cnt, 0);
INIT_LIST_HEAD(&qobj->qobj_list);
init_waitqueue_head(&qobj->thread_wq);
spin_lock_init(&qobj->cmd_queue_lock);
}
-EXPORT_SYMBOL(transport_init_queue_obj);
void transport_subsystem_check_init(void)
{
if (task->task_flags & TF_ACTIVE)
continue;
- if (!atomic_read(&task->task_state_active))
- continue;
-
spin_lock_irqsave(&dev->execute_task_lock, flags);
- list_del(&task->t_state_list);
- pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
- cmd->se_tfo->get_task_tag(cmd), dev, task);
- spin_unlock_irqrestore(&dev->execute_task_lock, flags);
+ if (task->t_state_active) {
+ pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
+ cmd->se_tfo->get_task_tag(cmd), dev, task);
- atomic_set(&task->task_state_active, 0);
- atomic_dec(&cmd->t_task_cdbs_ex_left);
+ list_del(&task->t_state_list);
+ atomic_dec(&cmd->t_task_cdbs_ex_left);
+ task->t_state_active = false;
+ }
+ spin_unlock_irqrestore(&dev->execute_task_lock, flags);
}
+
}
/* transport_cmd_check_stop():
task->task_scsi_status = GOOD;
} else {
task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
- task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST;
- task->task_se_cmd->transport_error_status =
- PYX_TRANSPORT_ILLEGAL_REQUEST;
+ task->task_se_cmd->scsi_sense_reason =
+ TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+
}
transport_complete_task(task, good);
{
struct se_cmd *cmd = container_of(work, struct se_cmd, work);
- transport_generic_request_failure(cmd, 1, 1);
+ transport_generic_request_failure(cmd);
}
/* transport_complete_task():
struct se_cmd *cmd = task->task_se_cmd;
struct se_device *dev = cmd->se_dev;
unsigned long flags;
-#if 0
- pr_debug("task: %p CDB: 0x%02x obj_ptr: %p\n", task,
- cmd->t_task_cdb[0], dev);
-#endif
- if (dev)
- atomic_inc(&dev->depth_left);
spin_lock_irqsave(&cmd->t_state_lock, flags);
task->task_flags &= ~TF_ACTIVE;
if (dev && dev->transport->transport_complete) {
if (dev->transport->transport_complete(task) != 0) {
cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
- task->task_sense = 1;
+ task->task_flags |= TF_HAS_SENSE;
success = 1;
}
}
}
if (cmd->t_tasks_failed) {
- if (!task->task_error_status) {
- task->task_error_status =
- PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
- cmd->transport_error_status =
- PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
- }
+ cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
INIT_WORK(&cmd->work, target_complete_failure_work);
} else {
atomic_set(&cmd->t_transport_complete, 1);
head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
atomic_inc(&dev->execute_tasks);
- if (atomic_read(&task->task_state_active))
+ if (task->t_state_active)
return;
/*
* Determine if this task needs to go to HEAD_OF_QUEUE for the
else
list_add_tail(&task->t_state_list, &dev->state_task_list);
- atomic_set(&task->task_state_active, 1);
+ task->t_state_active = true;
pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
spin_lock_irqsave(&cmd->t_state_lock, flags);
list_for_each_entry(task, &cmd->t_task_list, t_list) {
- if (atomic_read(&task->task_state_active))
- continue;
-
spin_lock(&dev->execute_task_lock);
- list_add_tail(&task->t_state_list, &dev->state_task_list);
- atomic_set(&task->task_state_active, 1);
-
- pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
- task->task_se_cmd->se_tfo->get_task_tag(
- task->task_se_cmd), task, dev);
-
+ if (!task->t_state_active) {
+ list_add_tail(&task->t_state_list,
+ &dev->state_task_list);
+ task->t_state_active = true;
+
+ pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
+ task->task_se_cmd->se_tfo->get_task_tag(
+ task->task_se_cmd), task, dev);
+ }
spin_unlock(&dev->execute_task_lock);
}
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
}
-static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
+static void __transport_add_tasks_from_cmd(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
struct se_task *task, *task_prev = NULL;
- unsigned long flags;
- spin_lock_irqsave(&dev->execute_task_lock, flags);
list_for_each_entry(task, &cmd->t_task_list, t_list) {
if (!list_empty(&task->t_execute_list))
continue;
__transport_add_task_to_execute_queue(task, task_prev, dev);
task_prev = task;
}
+}
+
+static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
+{
+ unsigned long flags;
+ struct se_device *dev = cmd->se_dev;
+
+ spin_lock_irqsave(&dev->execute_task_lock, flags);
+ __transport_add_tasks_from_cmd(cmd);
spin_unlock_irqrestore(&dev->execute_task_lock, flags);
}
atomic_dec(&dev->execute_tasks);
}
-void transport_remove_task_from_execute_queue(
+static void transport_remove_task_from_execute_queue(
struct se_task *task,
struct se_device *dev)
{
break;
}
- *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d",
- atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left),
- dev->queue_depth);
+ *bl += sprintf(b + *bl, " Execute/Max Queue Depth: %d/%d",
+ atomic_read(&dev->execute_tasks), dev->queue_depth);
*bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
*bl += sprintf(b + *bl, " ");
dev->se_hba = hba;
dev->se_sub_dev = se_dev;
dev->transport = transport;
- atomic_set(&dev->active_cmds, 0);
INIT_LIST_HEAD(&dev->dev_list);
INIT_LIST_HEAD(&dev->dev_sep_list);
INIT_LIST_HEAD(&dev->dev_tmr_list);
INIT_LIST_HEAD(&dev->execute_task_list);
INIT_LIST_HEAD(&dev->delayed_cmd_list);
- INIT_LIST_HEAD(&dev->ordered_cmd_list);
INIT_LIST_HEAD(&dev->state_task_list);
INIT_LIST_HEAD(&dev->qf_cmd_list);
spin_lock_init(&dev->execute_task_lock);
spin_lock_init(&dev->delayed_cmd_lock);
- spin_lock_init(&dev->ordered_cmd_lock);
- spin_lock_init(&dev->state_task_lock);
- spin_lock_init(&dev->dev_alua_lock);
spin_lock_init(&dev->dev_reservation_lock);
spin_lock_init(&dev->dev_status_lock);
- spin_lock_init(&dev->dev_status_thr_lock);
spin_lock_init(&dev->se_port_lock);
spin_lock_init(&dev->se_tmr_lock);
spin_lock_init(&dev->qf_cmd_lock);
-
- dev->queue_depth = dev_limits->queue_depth;
- atomic_set(&dev->depth_left, dev->queue_depth);
atomic_set(&dev->dev_ordered_id, 0);
se_dev_set_default_attribs(dev, dev_limits);
{
INIT_LIST_HEAD(&cmd->se_lun_node);
INIT_LIST_HEAD(&cmd->se_delayed_node);
- INIT_LIST_HEAD(&cmd->se_ordered_node);
INIT_LIST_HEAD(&cmd->se_qf_node);
INIT_LIST_HEAD(&cmd->se_queue_node);
INIT_LIST_HEAD(&cmd->se_cmd_list);
pr_err("Received SCSI CDB with command_size: %d that"
" exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
+ cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+ cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
return -EINVAL;
}
/*
" %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
scsi_command_size(cdb),
(unsigned long)sizeof(cmd->__t_task_cdb));
+ cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+ cmd->scsi_sense_reason =
+ TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -ENOMEM;
}
} else
* and call transport_generic_request_failure() if necessary..
*/
ret = transport_generic_new_cmd(cmd);
- if (ret < 0) {
- cmd->transport_error_status = ret;
- transport_generic_request_failure(cmd, 0,
- (cmd->data_direction != DMA_TO_DEVICE));
- }
+ if (ret < 0)
+ transport_generic_request_failure(cmd);
+
return 0;
}
EXPORT_SYMBOL(transport_handle_cdb_direct);
+/**
+ * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
+ *
+ * @se_cmd: command descriptor to submit
+ * @se_sess: associated se_sess for endpoint
+ * @cdb: pointer to SCSI CDB
+ * @sense: pointer to SCSI sense buffer
+ * @unpacked_lun: unpacked LUN to reference for struct se_lun
+ * @data_length: fabric expected data transfer length
+ * @task_addr: SAM task attribute
+ * @data_dir: DMA data direction
+ * @flags: flags for command submission from target_sc_flags_tables
+ *
+ * This may only be called from process context, and also currently
+ * assumes internal allocation of fabric payload buffer by target-core.
+ **/
+int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
+ unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
+ u32 data_length, int task_attr, int data_dir, int flags)
+{
+ struct se_portal_group *se_tpg;
+ int rc;
+
+ se_tpg = se_sess->se_tpg;
+ BUG_ON(!se_tpg);
+ BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
+ BUG_ON(in_interrupt());
+ /*
+ * Initialize se_cmd for target operation. From this point
+ * exceptions are handled by sending exception status via
+ * target_core_fabric_ops->queue_status() callback
+ */
+ transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
+ data_length, data_dir, task_attr, sense);
+ /*
+ * 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.
+ */
+ target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
+ /*
+ * Signal bidirectional data payloads to target-core
+ */
+ if (flags & TARGET_SCF_BIDI_OP)
+ se_cmd->se_cmd_flags |= SCF_BIDI;
+ /*
+ * Locate se_lun pointer and attach it to struct se_cmd
+ */
+ if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0)
+ goto out_check_cond;
+ /*
+ * Sanitize CDBs via transport_generic_cmd_sequencer() and
+ * allocate the necessary tasks to complete the received CDB+data
+ */
+ rc = transport_generic_allocate_tasks(se_cmd, cdb);
+ if (rc != 0)
+ goto out_check_cond;
+ /*
+ * Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
+ * for immediate execution of READs, otherwise wait for
+ * transport_generic_handle_data() to be called for WRITEs
+ * when fabric has filled the incoming buffer.
+ */
+ transport_handle_cdb_direct(se_cmd);
+ return 0;
+
+out_check_cond:
+ transport_send_check_condition_and_sense(se_cmd,
+ se_cmd->scsi_sense_reason, 0);
+ return 0;
+}
+EXPORT_SYMBOL(target_submit_cmd);
+
/*
* Used by fabric module frontends defining a TFO->new_cmd_map() caller
* to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
/*
* Handle SAM-esque emulation for generic transport request failures.
*/
-static void transport_generic_request_failure(
- struct se_cmd *cmd,
- int complete,
- int sc)
+static void transport_generic_request_failure(struct se_cmd *cmd)
{
int ret = 0;
pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
" CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
cmd->t_task_cdb[0]);
- pr_debug("-----[ i_state: %d t_state: %d transport_error_status: %d\n",
+ pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
cmd->se_tfo->get_cmd_state(cmd),
- cmd->t_state,
- cmd->transport_error_status);
+ cmd->t_state, cmd->scsi_sense_reason);
pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
" t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
" t_transport_active: %d t_transport_stop: %d"
if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
transport_complete_task_attr(cmd);
- if (complete) {
- cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
- }
-
- switch (cmd->transport_error_status) {
- case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE:
- cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
- break;
- case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS:
- cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY;
- break;
- case PYX_TRANSPORT_INVALID_CDB_FIELD:
- cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
- break;
- case PYX_TRANSPORT_INVALID_PARAMETER_LIST:
- cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
- break;
- case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES:
- if (!sc)
- transport_new_cmd_failure(cmd);
- /*
- * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES,
- * we force this session to fall back to session
- * recovery.
- */
- cmd->se_tfo->fall_back_to_erl0(cmd->se_sess);
- cmd->se_tfo->stop_session(cmd->se_sess, 0, 0);
-
- goto check_stop;
- case PYX_TRANSPORT_LU_COMM_FAILURE:
- case PYX_TRANSPORT_ILLEGAL_REQUEST:
- cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
- break;
- case PYX_TRANSPORT_UNKNOWN_MODE_PAGE:
- cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE;
- break;
- case PYX_TRANSPORT_WRITE_PROTECTED:
- cmd->scsi_sense_reason = TCM_WRITE_PROTECTED;
+ switch (cmd->scsi_sense_reason) {
+ case TCM_NON_EXISTENT_LUN:
+ case TCM_UNSUPPORTED_SCSI_OPCODE:
+ case TCM_INVALID_CDB_FIELD:
+ case TCM_INVALID_PARAMETER_LIST:
+ case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
+ case TCM_UNKNOWN_MODE_PAGE:
+ case TCM_WRITE_PROTECTED:
+ case TCM_CHECK_CONDITION_ABORT_CMD:
+ case TCM_CHECK_CONDITION_UNIT_ATTENTION:
+ case TCM_CHECK_CONDITION_NOT_READY:
break;
- case PYX_TRANSPORT_RESERVATION_CONFLICT:
+ case TCM_RESERVATION_CONFLICT:
/*
* No SENSE Data payload for this case, set SCSI Status
* and queue the response to $FABRIC_MOD.
if (ret == -EAGAIN || ret == -ENOMEM)
goto queue_full;
goto check_stop;
- case PYX_TRANSPORT_USE_SENSE_REASON:
- /*
- * struct se_cmd->scsi_sense_reason already set
- */
- break;
default:
pr_err("Unknown transport error for CDB 0x%02x: %d\n",
- cmd->t_task_cdb[0],
- cmd->transport_error_status);
+ cmd->t_task_cdb[0], cmd->scsi_sense_reason);
cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
break;
}
* transport_send_check_condition_and_sense() after handling
* possible unsoliticied write data payloads.
*/
- if (!sc && !cmd->se_tfo->new_cmd_map)
- transport_new_cmd_failure(cmd);
- else {
- ret = transport_send_check_condition_and_sense(cmd,
- cmd->scsi_sense_reason, 0);
- if (ret == -EAGAIN || ret == -ENOMEM)
- goto queue_full;
- }
+ ret = transport_send_check_condition_and_sense(cmd,
+ cmd->scsi_sense_reason, 0);
+ if (ret == -EAGAIN || ret == -ENOMEM)
+ goto queue_full;
check_stop:
transport_lun_remove_cmd(cmd);
spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
}
-static inline int transport_tcq_window_closed(struct se_device *dev)
-{
- if (dev->dev_tcq_window_closed++ <
- PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) {
- msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT);
- } else
- msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG);
-
- wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
- return 0;
-}
-
/*
* Called from Fabric Module context from transport_execute_tasks()
*
* to allow the passed struct se_cmd list of tasks to the front of the list.
*/
if (cmd->sam_task_attr == MSG_HEAD_TAG) {
- atomic_inc(&cmd->se_dev->dev_hoq_count);
- smp_mb__after_atomic_inc();
pr_debug("Added HEAD_OF_QUEUE for CDB:"
" 0x%02x, se_ordered_id: %u\n",
cmd->t_task_cdb[0],
cmd->se_ordered_id);
return 1;
} else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
- spin_lock(&cmd->se_dev->ordered_cmd_lock);
- list_add_tail(&cmd->se_ordered_node,
- &cmd->se_dev->ordered_cmd_list);
- spin_unlock(&cmd->se_dev->ordered_cmd_lock);
-
atomic_inc(&cmd->se_dev->dev_ordered_sync);
smp_mb__after_atomic_inc();
static int transport_execute_tasks(struct se_cmd *cmd)
{
int add_tasks;
-
- if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) {
- cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE;
- transport_generic_request_failure(cmd, 0, 1);
- return 0;
- }
-
+ struct se_device *se_dev = cmd->se_dev;
/*
* Call transport_cmd_check_stop() to see if a fabric exception
* has occurred that prevents execution.
if (!add_tasks)
goto execute_tasks;
/*
- * This calls transport_add_tasks_from_cmd() to handle
- * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation
- * (if enabled) in __transport_add_task_to_execute_queue() and
- * transport_add_task_check_sam_attr().
+ * __transport_execute_tasks() -> __transport_add_tasks_from_cmd()
+ * adds associated se_tasks while holding dev->execute_task_lock
+ * before I/O dispath to avoid a double spinlock access.
*/
- transport_add_tasks_from_cmd(cmd);
+ __transport_execute_tasks(se_dev, cmd);
+ return 0;
}
- /*
- * Kick the execution queue for the cmd associated struct se_device
- * storage object.
- */
+
execute_tasks:
- __transport_execute_tasks(cmd->se_dev);
+ __transport_execute_tasks(se_dev, NULL);
return 0;
}
*
* Called from transport_processing_thread()
*/
-static int __transport_execute_tasks(struct se_device *dev)
+static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd)
{
int error;
struct se_cmd *cmd = NULL;
struct se_task *task = NULL;
unsigned long flags;
- /*
- * Check if there is enough room in the device and HBA queue to send
- * struct se_tasks to the selected transport.
- */
check_depth:
- if (!atomic_read(&dev->depth_left))
- return transport_tcq_window_closed(dev);
-
- dev->dev_tcq_window_closed = 0;
-
spin_lock_irq(&dev->execute_task_lock);
+ if (new_cmd != NULL)
+ __transport_add_tasks_from_cmd(new_cmd);
+
if (list_empty(&dev->execute_task_list)) {
spin_unlock_irq(&dev->execute_task_lock);
return 0;
__transport_remove_task_from_execute_queue(task, dev);
spin_unlock_irq(&dev->execute_task_lock);
- atomic_dec(&dev->depth_left);
-
cmd = task->task_se_cmd;
-
spin_lock_irqsave(&cmd->t_state_lock, flags);
task->task_flags |= (TF_ACTIVE | TF_SENT);
atomic_inc(&cmd->t_task_cdbs_sent);
else
error = dev->transport->do_task(task);
if (error != 0) {
- cmd->transport_error_status = error;
spin_lock_irqsave(&cmd->t_state_lock, flags);
task->task_flags &= ~TF_ACTIVE;
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
atomic_set(&cmd->t_transport_sent, 0);
transport_stop_tasks_for_cmd(cmd);
- atomic_inc(&dev->depth_left);
- transport_generic_request_failure(cmd, 0, 1);
+ transport_generic_request_failure(cmd);
}
+ new_cmd = NULL;
goto check_depth;
return 0;
}
-void transport_new_cmd_failure(struct se_cmd *se_cmd)
-{
- unsigned long flags;
- /*
- * Any unsolicited data will get dumped for failed command inside of
- * the fabric plugin
- */
- spin_lock_irqsave(&se_cmd->t_state_lock, flags);
- se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED;
- se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
- spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
-}
-
static inline u32 transport_get_sectors_6(
unsigned char *cdb,
struct se_cmd *cmd,
/*
* Everything else assume TYPE_DISK Sector CDB location.
- * Use 8-bit sector value.
+ * Use 8-bit sector value. SBC-3 says:
+ *
+ * A TRANSFER LENGTH field set to zero specifies that 256
+ * logical blocks shall be written. Any other value
+ * specifies the number of logical blocks that shall be
+ * written.
*/
type_disk:
- return (u32)cdb[4];
+ return cdb[4] ? : 256;
}
static inline u32 transport_get_sectors_10(
list_for_each_entry_safe(task, task_tmp,
&cmd->t_task_list, t_list) {
- if (!task->task_sense)
+ if (!(task->task_flags & TF_HAS_SENSE))
continue;
if (!dev->transport->get_sense_buffer) {
return -1;
}
-static int
-transport_handle_reservation_conflict(struct se_cmd *cmd)
-{
- cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
- cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
- cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
- /*
- * For UA Interlock Code 11b, a RESERVATION CONFLICT will
- * establish a UNIT ATTENTION with PREVIOUS RESERVATION
- * CONFLICT STATUS.
- *
- * See spc4r17, section 7.4.6 Control Mode Page, Table 349
- */
- if (cmd->se_sess &&
- cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
- core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
- cmd->orig_fe_lun, 0x2C,
- ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
- return -EINVAL;
-}
-
static inline long long transport_dev_end_lba(struct se_device *dev)
{
return dev->transport->get_blocks(dev) + 1;
*/
if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
- cmd, cdb, pr_reg_type) != 0)
- return transport_handle_reservation_conflict(cmd);
+ cmd, cdb, pr_reg_type) != 0) {
+ cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+ cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
+ cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
+ return -EBUSY;
+ }
/*
* This means the CDB is allowed for the SCSI Initiator port
* when said port is *NOT* holding the legacy SPC-2 or
goto out_unsupported_cdb;
size = transport_get_size(sectors, cdb, cmd);
cmd->t_task_lba = transport_lba_32(cdb);
- cmd->t_tasks_fua = (cdb[1] & 0x8);
+ if (cdb[1] & 0x8)
+ cmd->se_cmd_flags |= SCF_FUA;
cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
break;
case WRITE_12:
goto out_unsupported_cdb;
size = transport_get_size(sectors, cdb, cmd);
cmd->t_task_lba = transport_lba_32(cdb);
- cmd->t_tasks_fua = (cdb[1] & 0x8);
+ if (cdb[1] & 0x8)
+ cmd->se_cmd_flags |= SCF_FUA;
cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
break;
case WRITE_16:
goto out_unsupported_cdb;
size = transport_get_size(sectors, cdb, cmd);
cmd->t_task_lba = transport_lba_64(cdb);
- cmd->t_tasks_fua = (cdb[1] & 0x8);
+ if (cdb[1] & 0x8)
+ cmd->se_cmd_flags |= SCF_FUA;
cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
break;
case XDWRITEREAD_10:
if ((cmd->data_direction != DMA_TO_DEVICE) ||
- !(cmd->t_tasks_bidi))
+ !(cmd->se_cmd_flags & SCF_BIDI))
goto out_invalid_cdb_field;
sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
if (sector_ret)
* Setup BIDI XOR callback to be run after I/O completion.
*/
cmd->transport_complete_callback = &transport_xor_callback;
- cmd->t_tasks_fua = (cdb[1] & 0x8);
+ if (cdb[1] & 0x8)
+ cmd->se_cmd_flags |= SCF_FUA;
break;
case VARIABLE_LENGTH_CMD:
service_action = get_unaligned_be16(&cdb[8]);
* completion.
*/
cmd->transport_complete_callback = &transport_xor_callback;
- cmd->t_tasks_fua = (cdb[10] & 0x8);
+ if (cdb[1] & 0x8)
+ cmd->se_cmd_flags |= SCF_FUA;
break;
case WRITE_SAME_32:
sectors = transport_get_sectors_32(cdb, cmd, §or_ret);
" SIMPLE: %u\n", dev->dev_cur_ordered_id,
cmd->se_ordered_id);
} else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
- atomic_dec(&dev->dev_hoq_count);
- smp_mb__after_atomic_dec();
dev->dev_cur_ordered_id++;
pr_debug("Incremented dev_cur_ordered_id: %u for"
" HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
cmd->se_ordered_id);
} else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
- spin_lock(&dev->ordered_cmd_lock);
- list_del(&cmd->se_ordered_node);
atomic_dec(&dev->dev_ordered_sync);
smp_mb__after_atomic_dec();
- spin_unlock(&dev->ordered_cmd_lock);
dev->dev_cur_ordered_id++;
pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
cmd->t_bidi_data_nents = 0;
}
+/**
+ * transport_release_cmd - free a command
+ * @cmd: command to free
+ *
+ * This routine unconditionally frees a command, and reference counting
+ * or list removal must be done in the caller.
+ */
+static void transport_release_cmd(struct se_cmd *cmd)
+{
+ BUG_ON(!cmd->se_tfo);
+
+ if (cmd->se_tmr_req)
+ core_tmr_release_req(cmd->se_tmr_req);
+ if (cmd->t_task_cdb != cmd->__t_task_cdb)
+ kfree(cmd->t_task_cdb);
+ /*
+ * If this cmd has been setup with target_get_sess_cmd(), drop
+ * the kref and call ->release_cmd() in kref callback.
+ */
+ if (cmd->check_release != 0) {
+ target_put_sess_cmd(cmd->se_sess, cmd);
+ return;
+ }
+ cmd->se_tfo->release_cmd(cmd);
+}
+
/**
* transport_put_cmd - release a reference to a command
* @cmd: command to release
if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
(cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
+ /*
+ * Reject SCSI data overflow with map_mem_to_cmd() as incoming
+ * scatterlists already have been set to follow what the fabric
+ * passes for the original expected data transfer length.
+ */
+ if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
+ pr_warn("Rejecting SCSI DATA overflow for fabric using"
+ " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
+ cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
+ cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
+ return -EINVAL;
+ }
cmd->t_data_sg = sgl;
cmd->t_data_nents = sgl_count;
cmd->data_length) {
ret = transport_generic_get_mem(cmd);
if (ret < 0)
- return ret;
+ goto out_fail;
}
/*
task_cdbs = transport_allocate_control_task(cmd);
}
- if (task_cdbs <= 0)
+ if (task_cdbs < 0)
goto out_fail;
+ else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
+ cmd->t_state = TRANSPORT_COMPLETE;
+ atomic_set(&cmd->t_transport_active, 1);
+ INIT_WORK(&cmd->work, target_complete_ok_work);
+ queue_work(target_completion_wq, &cmd->work);
+ return 0;
+ }
if (set_counts) {
atomic_inc(&cmd->t_fe_count);
else if (ret < 0)
return ret;
- return PYX_TRANSPORT_WRITE_PENDING;
+ return 1;
queue_full:
pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
return 0;
}
-/**
- * transport_release_cmd - free a command
- * @cmd: command to free
- *
- * This routine unconditionally frees a command, and reference counting
- * or list removal must be done in the caller.
- */
-void transport_release_cmd(struct se_cmd *cmd)
-{
- BUG_ON(!cmd->se_tfo);
-
- if (cmd->se_tmr_req)
- core_tmr_release_req(cmd->se_tmr_req);
- if (cmd->t_task_cdb != cmd->__t_task_cdb)
- kfree(cmd->t_task_cdb);
- /*
- * Check if target_wait_for_sess_cmds() is expecting to
- * release se_cmd directly here..
- */
- if (cmd->check_release != 0 && cmd->se_tfo->check_release_cmd)
- if (cmd->se_tfo->check_release_cmd(cmd) != 0)
- return;
-
- cmd->se_tfo->release_cmd(cmd);
-}
-EXPORT_SYMBOL(transport_release_cmd);
-
void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
{
if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
/* target_get_sess_cmd - Add command to active ->sess_cmd_list
* @se_sess: session to reference
* @se_cmd: command descriptor to add
+ * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
*/
-void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
+void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
+ bool ack_kref)
{
unsigned long flags;
+ kref_init(&se_cmd->cmd_kref);
+ /*
+ * Add a second kref if the fabric caller is expecting to handle
+ * fabric acknowledgement that requires two target_put_sess_cmd()
+ * invocations before se_cmd descriptor release.
+ */
+ if (ack_kref == true)
+ kref_get(&se_cmd->cmd_kref);
+
spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
se_cmd->check_release = 1;
}
EXPORT_SYMBOL(target_get_sess_cmd);
-/* target_put_sess_cmd - Check for active I/O shutdown or list delete
- * @se_sess: session to reference
- * @se_cmd: command descriptor to drop
- */
-int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
+static void target_release_cmd_kref(struct kref *kref)
{
+ struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
+ struct se_session *se_sess = se_cmd->se_sess;
unsigned long flags;
spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
if (list_empty(&se_cmd->se_cmd_list)) {
spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
WARN_ON(1);
- return 0;
+ return;
}
-
if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
complete(&se_cmd->cmd_wait_comp);
- return 1;
+ return;
}
list_del(&se_cmd->se_cmd_list);
spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
- return 0;
+ se_cmd->se_tfo->release_cmd(se_cmd);
+}
+
+/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
+ * @se_sess: session to reference
+ * @se_cmd: command descriptor to drop
+ */
+int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
+{
+ return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
}
EXPORT_SYMBOL(target_put_sess_cmd);
static int transport_clear_lun_thread(void *p)
{
- struct se_lun *lun = (struct se_lun *)p;
+ struct se_lun *lun = p;
__transport_clear_lun_from_sessions(lun);
complete(&lun->lun_shutdown_comp);
case TCM_NON_EXISTENT_LUN:
/* CURRENT ERROR */
buffer[offset] = 0x70;
+ buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
/* ILLEGAL REQUEST */
buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
/* LOGICAL UNIT NOT SUPPORTED */
case TCM_SECTOR_COUNT_TOO_MANY:
/* CURRENT ERROR */
buffer[offset] = 0x70;
+ buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
/* ILLEGAL REQUEST */
buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
/* INVALID COMMAND OPERATION CODE */
case TCM_UNKNOWN_MODE_PAGE:
/* CURRENT ERROR */
buffer[offset] = 0x70;
+ buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
/* ILLEGAL REQUEST */
buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
/* INVALID FIELD IN CDB */
case TCM_CHECK_CONDITION_ABORT_CMD:
/* CURRENT ERROR */
buffer[offset] = 0x70;
+ buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
/* ABORTED COMMAND */
buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
/* BUS DEVICE RESET FUNCTION OCCURRED */
case TCM_INCORRECT_AMOUNT_OF_DATA:
/* CURRENT ERROR */
buffer[offset] = 0x70;
+ buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
/* ABORTED COMMAND */
buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
/* WRITE ERROR */
case TCM_INVALID_CDB_FIELD:
/* CURRENT ERROR */
buffer[offset] = 0x70;
+ buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
/* ABORTED COMMAND */
buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
/* INVALID FIELD IN CDB */
case TCM_INVALID_PARAMETER_LIST:
/* CURRENT ERROR */
buffer[offset] = 0x70;
+ buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
/* ABORTED COMMAND */
buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
/* INVALID FIELD IN PARAMETER LIST */
case TCM_UNEXPECTED_UNSOLICITED_DATA:
/* CURRENT ERROR */
buffer[offset] = 0x70;
+ buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
/* ABORTED COMMAND */
buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
/* WRITE ERROR */
case TCM_SERVICE_CRC_ERROR:
/* CURRENT ERROR */
buffer[offset] = 0x70;
+ buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
/* ABORTED COMMAND */
buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
/* PROTOCOL SERVICE CRC ERROR */
case TCM_SNACK_REJECTED:
/* CURRENT ERROR */
buffer[offset] = 0x70;
+ buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
/* ABORTED COMMAND */
buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
/* READ ERROR */
case TCM_WRITE_PROTECTED:
/* CURRENT ERROR */
buffer[offset] = 0x70;
+ buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
/* DATA PROTECT */
buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
/* WRITE PROTECTED */
case TCM_CHECK_CONDITION_UNIT_ATTENTION:
/* CURRENT ERROR */
buffer[offset] = 0x70;
+ buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
/* UNIT ATTENTION */
buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
case TCM_CHECK_CONDITION_NOT_READY:
/* CURRENT ERROR */
buffer[offset] = 0x70;
+ buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
/* Not Ready */
buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
transport_get_sense_codes(cmd, &asc, &ascq);
default:
/* CURRENT ERROR */
buffer[offset] = 0x70;
+ buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
/* ILLEGAL REQUEST */
buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
/* LOGICAL UNIT COMMUNICATION FAILURE */
if (cmd->se_tfo->write_pending_status(cmd) != 0) {
atomic_inc(&cmd->t_transport_aborted);
smp_mb__after_atomic_inc();
- cmd->scsi_status = SAM_STAT_TASK_ABORTED;
- transport_new_cmd_failure(cmd);
- return;
}
}
cmd->scsi_status = SAM_STAT_TASK_ABORTED;
cmd->se_tfo->queue_status(cmd);
}
-/* transport_generic_do_tmr():
- *
- *
- */
-int transport_generic_do_tmr(struct se_cmd *cmd)
+static int transport_generic_do_tmr(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
struct se_tmr_req *tmr = cmd->se_tmr_req;
{
int ret;
struct se_cmd *cmd;
- struct se_device *dev = (struct se_device *) param;
-
- set_user_nice(current, -20);
+ struct se_device *dev = param;
while (!kthread_should_stop()) {
ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
goto out;
get_cmd:
- __transport_execute_tasks(dev);
-
cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
if (!cmd)
continue;
}
ret = cmd->se_tfo->new_cmd_map(cmd);
if (ret < 0) {
- cmd->transport_error_status = ret;
- transport_generic_request_failure(cmd,
- 0, (cmd->data_direction !=
- DMA_TO_DEVICE));
+ transport_generic_request_failure(cmd);
break;
}
ret = transport_generic_new_cmd(cmd);
if (ret < 0) {
- cmd->transport_error_status = ret;
- transport_generic_request_failure(cmd,
- 0, (cmd->data_direction !=
- DMA_TO_DEVICE));
+ transport_generic_request_failure(cmd);
+ break;
}
break;
case TRANSPORT_PROCESS_WRITE:
projects / cascardo / linux.git / blobdiff