tcm_loop: TCQ and command abort support
Implement TCQ support, which enables us to do proper command
abort, too.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
diff --git a/drivers/target/loopback/tcm_loop.c b/drivers/target/loopback/tcm_loop.c
index 783675f..04811ca 100644
--- a/drivers/target/loopback/tcm_loop.c
+++ b/drivers/target/loopback/tcm_loop.c
@@ -135,6 +135,21 @@
return sdev->queue_depth;
}
+static int tcm_loop_change_queue_type(struct scsi_device *sdev, int tag)
+{
+ if (sdev->tagged_supported) {
+ scsi_set_tag_type(sdev, tag);
+
+ if (tag)
+ scsi_activate_tcq(sdev, sdev->queue_depth);
+ else
+ scsi_deactivate_tcq(sdev, sdev->queue_depth);
+ } else
+ tag = 0;
+
+ return tag;
+}
+
/*
* Locate the SAM Task Attr from struct scsi_cmnd *
*/
@@ -236,6 +251,7 @@
}
tl_cmd->sc = sc;
+ tl_cmd->sc_cmd_tag = sc->tag;
INIT_WORK(&tl_cmd->work, tcm_loop_submission_work);
queue_work(tcm_loop_workqueue, &tl_cmd->work);
return 0;
@@ -247,7 +263,7 @@
*/
static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg,
struct tcm_loop_nexus *tl_nexus,
- int lun, enum tcm_tmreq_table tmr)
+ int lun, int task, enum tcm_tmreq_table tmr)
{
struct se_cmd *se_cmd = NULL;
struct se_session *se_sess;
@@ -283,6 +299,9 @@
if (rc < 0)
goto release;
+ if (tmr == TMR_ABORT_TASK)
+ se_cmd->se_tmr_req->ref_task_tag = task;
+
/*
* Locate the underlying TCM struct se_lun
*/
@@ -310,6 +329,36 @@
return ret;
}
+static int tcm_loop_abort_task(struct scsi_cmnd *sc)
+{
+ struct tcm_loop_hba *tl_hba;
+ struct tcm_loop_nexus *tl_nexus;
+ struct tcm_loop_tpg *tl_tpg;
+ int ret = FAILED;
+
+ /*
+ * Locate the tcm_loop_hba_t pointer
+ */
+ tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
+ /*
+ * Locate the tl_nexus and se_sess pointers
+ */
+ tl_nexus = tl_hba->tl_nexus;
+ if (!tl_nexus) {
+ pr_err("Unable to perform device reset without"
+ " active I_T Nexus\n");
+ return FAILED;
+ }
+
+ /*
+ * Locate the tl_tpg pointer from TargetID in sc->device->id
+ */
+ tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
+ ret = tcm_loop_issue_tmr(tl_tpg, tl_nexus, sc->device->lun,
+ sc->tag, TMR_ABORT_TASK);
+ return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
+}
+
/*
* Called from SCSI EH process context to issue a LUN_RESET TMR
* to struct scsi_device
@@ -338,8 +387,8 @@
* Locate the tl_tpg pointer from TargetID in sc->device->id
*/
tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
- ret = tcm_loop_issue_tmr(tl_tpg, tl_nexus,
- sc->device->lun, TMR_LUN_RESET);
+ ret = tcm_loop_issue_tmr(tl_tpg, tl_nexus, sc->device->lun,
+ 0, TMR_LUN_RESET);
return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
}
@@ -351,6 +400,15 @@
static int tcm_loop_slave_configure(struct scsi_device *sd)
{
+ if (sd->tagged_supported) {
+ scsi_activate_tcq(sd, sd->queue_depth);
+ scsi_adjust_queue_depth(sd, MSG_SIMPLE_TAG,
+ sd->host->cmd_per_lun);
+ } else {
+ scsi_adjust_queue_depth(sd, 0,
+ sd->host->cmd_per_lun);
+ }
+
return 0;
}
@@ -360,6 +418,8 @@
.name = "TCM_Loopback",
.queuecommand = tcm_loop_queuecommand,
.change_queue_depth = tcm_loop_change_queue_depth,
+ .change_queue_type = tcm_loop_change_queue_type,
+ .eh_abort_handler = tcm_loop_abort_task,
.eh_device_reset_handler = tcm_loop_device_reset,
.can_queue = 1024,
.this_id = -1,
@@ -719,7 +779,10 @@
static u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd)
{
- return 1;
+ struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
+ struct tcm_loop_cmd, tl_se_cmd);
+
+ return tl_cmd->sc_cmd_tag;
}
static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
diff --git a/drivers/target/loopback/tcm_loop.h b/drivers/target/loopback/tcm_loop.h
index 56528f7..54c59d0 100644
--- a/drivers/target/loopback/tcm_loop.h
+++ b/drivers/target/loopback/tcm_loop.h
@@ -10,6 +10,8 @@
struct tcm_loop_cmd {
/* State of Linux/SCSI CDB+Data descriptor */
u32 sc_cmd_state;
+ /* Tagged command queueing */
+ u32 sc_cmd_tag;
/* Pointer to the CDB+Data descriptor from Linux/SCSI subsystem */
struct scsi_cmnd *sc;
/* The TCM I/O descriptor that is accessed via container_of() */