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target: kill dev->dev_task_attr_type

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We can just key off ordered tag emulation of the transport_type field.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Christoph Hellwig 2012-10-10 17:37:14 -04:00 committed by Nicholas Bellinger
parent e6c4219b54
commit 019c4ca621
4 changed files with 70 additions and 84 deletions
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5
drivers/target/target_core_device.c
View File

@ -1412,11 +1412,6 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
dev->dev_attrib.fabric_max_sectors = DA_FABRIC_MAX_SECTORS;
dev->dev_attrib.optimal_sectors = DA_FABRIC_MAX_SECTORS;
if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
else
dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
return dev;
}

6
drivers/target/target_core_spc.c
View File

@ -1054,8 +1054,7 @@ int spc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
* Do implict HEAD_OF_QUEUE processing for INQUIRY.
* See spc4r17 section 5.3
*/
if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
cmd->sam_task_attr = MSG_HEAD_TAG;
cmd->sam_task_attr = MSG_HEAD_TAG;
cmd->execute_cmd = spc_emulate_inquiry;
break;
case SECURITY_PROTOCOL_IN:
@ -1083,8 +1082,7 @@ int spc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
* Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
* See spc4r17 section 5.3
*/
if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
cmd->sam_task_attr = MSG_HEAD_TAG;
cmd->sam_task_attr = MSG_HEAD_TAG;
break;
case TEST_UNIT_READY:
cmd->execute_cmd = spc_emulate_testunitready;

132
drivers/target/target_core_transport.c
View File

@ -1068,11 +1068,13 @@ EXPORT_SYMBOL(transport_init_se_cmd);
static int 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 (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
return 0;
if (cmd->sam_task_attr == MSG_ACA_TAG) {
@ -1084,11 +1086,11 @@ static int transport_check_alloc_task_attr(struct se_cmd *cmd)
* Used to determine when ORDERED commands should go from
* Dormant to Active status.
*/
cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
smp_mb__after_atomic_inc();
pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
cmd->se_ordered_id, cmd->sam_task_attr,
cmd->se_dev->transport->name);
dev->transport->name);
return 0;
}
@ -1534,8 +1536,7 @@ void transport_generic_request_failure(struct se_cmd *cmd)
/*
* For SAM Task Attribute emulation for failed struct se_cmd
*/
if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
transport_complete_task_attr(cmd);
transport_complete_task_attr(cmd);
switch (cmd->scsi_sense_reason) {
case TCM_NON_EXISTENT_LUN:
@ -1619,10 +1620,63 @@ static void __target_execute_cmd(struct se_cmd *cmd)
}
}
void target_execute_cmd(struct se_cmd *cmd)
static bool target_handle_task_attr(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
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 MSG_HEAD_TAG:
pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
"se_ordered_id: %u\n",
cmd->t_task_cdb[0], cmd->se_ordered_id);
return false;
case MSG_ORDERED_TAG:
atomic_inc(&dev->dev_ordered_sync);
smp_mb__after_atomic_inc();
pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
" se_ordered_id: %u\n",
cmd->t_task_cdb[0], cmd->se_ordered_id);
/*
* Execute an ORDERED command if no other older commands
* exist that need to be completed first.
*/
if (!atomic_read(&dev->simple_cmds))
return false;
break;
default:
/*
* For SIMPLE and UNTAGGED Task Attribute commands
*/
atomic_inc(&dev->simple_cmds);
smp_mb__after_atomic_inc();
break;
}
if (atomic_read(&dev->dev_ordered_sync) == 0)
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 list, se_ordered_id: %u\n",
cmd->t_task_cdb[0], cmd->sam_task_attr,
cmd->se_ordered_id);
return true;
}
void target_execute_cmd(struct se_cmd *cmd)
{
/*
* If the received CDB has aleady been aborted stop processing it here.
*/
@ -1660,60 +1714,8 @@ void target_execute_cmd(struct se_cmd *cmd)
cmd->t_state = TRANSPORT_PROCESSING;
spin_unlock_irq(&cmd->t_state_lock);
if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
goto execute;
/*
* Check for the existence of HEAD_OF_QUEUE, and if true return 1
* to allow the passed struct se_cmd list of tasks to the front of the list.
*/
switch (cmd->sam_task_attr) {
case MSG_HEAD_TAG:
pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
"se_ordered_id: %u\n",
cmd->t_task_cdb[0], cmd->se_ordered_id);
goto execute;
case MSG_ORDERED_TAG:
atomic_inc(&dev->dev_ordered_sync);
smp_mb__after_atomic_inc();
pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
" se_ordered_id: %u\n",
cmd->t_task_cdb[0], cmd->se_ordered_id);
/*
* Execute an ORDERED command if no other older commands
* exist that need to be completed first.
*/
if (!atomic_read(&dev->simple_cmds))
goto execute;
break;
default:
/*
* For SIMPLE and UNTAGGED Task Attribute commands
*/
atomic_inc(&dev->simple_cmds);
smp_mb__after_atomic_inc();
break;
}
if (atomic_read(&dev->dev_ordered_sync) != 0) {
spin_lock(&dev->delayed_cmd_lock);
list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
spin_unlock(&dev->delayed_cmd_lock);
pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
" delayed CMD list, se_ordered_id: %u\n",
cmd->t_task_cdb[0], cmd->sam_task_attr,
cmd->se_ordered_id);
return;
}
execute:
/*
* Otherwise, no ORDERED task attributes exist..
*/
__target_execute_cmd(cmd);
if (!target_handle_task_attr(cmd))
__target_execute_cmd(cmd);
}
EXPORT_SYMBOL(target_execute_cmd);
@ -1752,6 +1754,9 @@ static void transport_complete_task_attr(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
return;
if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
atomic_dec(&dev->simple_cmds);
smp_mb__after_atomic_dec();
@ -1780,8 +1785,7 @@ static void transport_complete_qf(struct se_cmd *cmd)
{
int ret = 0;
if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
transport_complete_task_attr(cmd);
transport_complete_task_attr(cmd);
if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
ret = cmd->se_tfo->queue_status(cmd);
@ -1839,8 +1843,8 @@ static void target_complete_ok_work(struct work_struct *work)
* delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
* Attribute.
*/
if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
transport_complete_task_attr(cmd);
transport_complete_task_attr(cmd);
/*
* Check to schedule QUEUE_FULL work, or execute an existing
* cmd->transport_qf_callback()

11
include/target/target_core_base.h
View File

@ -232,16 +232,6 @@ typedef enum {
SPC3_ALUA_EMULATED
} t10_alua_index_t;
/*
* Used by TCM Core internally to signal if SAM Task Attribute emulation
* is enabled or disabled, or running in with TCM/pSCSI passthrough mode
*/
typedef enum {
SAM_TASK_ATTR_PASSTHROUGH,
SAM_TASK_ATTR_UNTAGGED,
SAM_TASK_ATTR_EMULATED
} t10_task_attr_index_t;
/*
* Used for target SCSI statistics
*/
@ -686,7 +676,6 @@ struct se_device {
u32 queue_depth;
/* Used for SPC-2 reservations enforce of ISIDs */
u64 dev_res_bin_isid;
t10_task_attr_index_t dev_task_attr_type;
/* Pointer to transport specific device structure */
u32 dev_index;
u64 creation_time;