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-rw-r--r--drivers/target/target_core_device.c2
-rw-r--r--drivers/target/target_core_internal.h1
-rw-r--r--drivers/target/target_core_transport.c76
3 files changed, 57 insertions, 22 deletions
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index 8cb1fa0c0585..44bb380e7390 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -772,6 +772,8 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
INIT_LIST_HEAD(&dev->t10_alua.lba_map_list);
spin_lock_init(&dev->t10_alua.lba_map_lock);
+ INIT_WORK(&dev->delayed_cmd_work, target_do_delayed_work);
+
dev->t10_wwn.t10_dev = dev;
/*
* Use OpenFabrics IEEE Company ID: 00 14 05
diff --git a/drivers/target/target_core_internal.h b/drivers/target/target_core_internal.h
index a343bcfa2180..a889a6237d9c 100644
--- a/drivers/target/target_core_internal.h
+++ b/drivers/target/target_core_internal.h
@@ -151,6 +151,7 @@ int transport_dump_vpd_ident(struct t10_vpd *, unsigned char *, int);
void transport_clear_lun_ref(struct se_lun *);
sense_reason_t target_cmd_size_check(struct se_cmd *cmd, unsigned int size);
void target_qf_do_work(struct work_struct *work);
+void target_do_delayed_work(struct work_struct *work);
bool target_check_wce(struct se_device *dev);
bool target_check_fua(struct se_device *dev);
void __target_execute_cmd(struct se_cmd *, bool);
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 64e0477c7644..4a2e749eb182 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -2173,32 +2173,35 @@ static bool target_handle_task_attr(struct se_cmd *cmd)
*/
switch (cmd->sam_task_attr) {
case TCM_HEAD_TAG:
+ atomic_inc_mb(&dev->non_ordered);
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);
+ atomic_inc_mb(&dev->delayed_cmd_count);
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);
+ atomic_inc_mb(&dev->non_ordered);
+
+ if (atomic_read(&dev->delayed_cmd_count) == 0)
+ return false;
break;
}
- if (atomic_read(&dev->dev_ordered_sync) == 0)
- return false;
+ if (cmd->sam_task_attr != TCM_ORDERED_TAG) {
+ atomic_inc_mb(&dev->delayed_cmd_count);
+ /*
+ * We will account for this when we dequeue from the delayed
+ * list.
+ */
+ atomic_dec_mb(&dev->non_ordered);
+ }
spin_lock_irq(&cmd->t_state_lock);
cmd->transport_state &= ~CMD_T_SENT;
@@ -2210,6 +2213,12 @@ static bool target_handle_task_attr(struct se_cmd *cmd)
pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to delayed CMD listn",
cmd->t_task_cdb[0], cmd->sam_task_attr);
+ /*
+ * We may have no non ordered cmds when this function started or we
+ * could have raced with the last simple/head cmd completing, so kick
+ * the delayed handler here.
+ */
+ schedule_work(&dev->delayed_cmd_work);
return true;
}
@@ -2243,29 +2252,48 @@ 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)
+void target_do_delayed_work(struct work_struct *work)
{
- for (;;) {
+ struct se_device *dev = container_of(work, struct se_device,
+ delayed_cmd_work);
+
+ spin_lock(&dev->delayed_cmd_lock);
+ while (!dev->ordered_sync_in_progress) {
struct se_cmd *cmd;
- spin_lock(&dev->delayed_cmd_lock);
- if (list_empty(&dev->delayed_cmd_list)) {
- spin_unlock(&dev->delayed_cmd_lock);
+ if (list_empty(&dev->delayed_cmd_list))
break;
- }
cmd = list_entry(dev->delayed_cmd_list.next,
struct se_cmd, se_delayed_node);
+
+ if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
+ /*
+ * Check if we started with:
+ * [ordered] [simple] [ordered]
+ * and we are now at the last ordered so we have to wait
+ * for the simple cmd.
+ */
+ if (atomic_read(&dev->non_ordered) > 0)
+ break;
+
+ dev->ordered_sync_in_progress = true;
+ }
+
list_del(&cmd->se_delayed_node);
+ atomic_dec_mb(&dev->delayed_cmd_count);
spin_unlock(&dev->delayed_cmd_lock);
+ if (cmd->sam_task_attr != TCM_ORDERED_TAG)
+ atomic_inc_mb(&dev->non_ordered);
+
cmd->transport_state |= CMD_T_SENT;
__target_execute_cmd(cmd, true);
- if (cmd->sam_task_attr == TCM_ORDERED_TAG)
- break;
+ spin_lock(&dev->delayed_cmd_lock);
}
+ spin_unlock(&dev->delayed_cmd_lock);
}
/*
@@ -2283,14 +2311,17 @@ static void transport_complete_task_attr(struct se_cmd *cmd)
goto restart;
if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
- atomic_dec_mb(&dev->simple_cmds);
+ atomic_dec_mb(&dev->non_ordered);
dev->dev_cur_ordered_id++;
} else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
+ atomic_dec_mb(&dev->non_ordered);
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);
+ spin_lock(&dev->delayed_cmd_lock);
+ dev->ordered_sync_in_progress = false;
+ spin_unlock(&dev->delayed_cmd_lock);
dev->dev_cur_ordered_id++;
pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n",
@@ -2299,7 +2330,8 @@ static void transport_complete_task_attr(struct se_cmd *cmd)
cmd->se_cmd_flags &= ~SCF_TASK_ATTR_SET;
restart:
- target_restart_delayed_cmds(dev);
+ if (atomic_read(&dev->delayed_cmd_count) > 0)
+ schedule_work(&dev->delayed_cmd_work);
}
static void transport_complete_qf(struct se_cmd *cmd)
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-12 07:09:21 +0000