linux-kernel - [PATCH v2 2/4] target: Implement TMR_ABORT_TASK

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Message-Id: <7d31722a7e07bc24ea37b5841a17545003eeddb4.1658195608.git.Thinh.Nguyen@synopsys.com>
Date:   Mon, 18 Jul 2022 19:07:06 -0700
From:   Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To:     linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        target-devel@...r.kernel.org,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     John Youn <John.Youn@...opsys.com>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        linux-usb@...r.kernel.org
Subject: [PATCH v2 2/4] target: Implement TMR_ABORT_TASK_SET

Task ABORT TASK SET function is required by SCSI transport protocol
standards (SAM-4 r14 section 7.3). It is similar to ABORT TASK
function, but it applies to all commands received on a specified I_T
nexus rather than a specific referenced command. Modify
core_tmr_abort_task() to support TMR_ABORT_TASK_SET.

Signed-off-by: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
---
 Changes in v2:
 - None

 drivers/target/target_core_tmr.c       | 16 +++++++++++-----
 drivers/target/target_core_transport.c |  2 +-
 2 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/target/target_core_tmr.c b/drivers/target/target_core_tmr.c
index bac111456fa1..1ea72e15f872 100644
--- a/drivers/target/target_core_tmr.c
+++ b/drivers/target/target_core_tmr.c
@@ -131,11 +131,13 @@ void core_tmr_abort_task(
 				continue;
 
 			ref_tag = se_cmd->tag;
-			if (tmr->ref_task_tag != ref_tag)
-				continue;
+			if (tmr->function == TMR_ABORT_TASK) {
+				if (tmr->ref_task_tag != ref_tag)
+					continue;
 
-			pr_err("ABORT_TASK: Found referenced %s task_tag: %llu\n",
-			       se_cmd->se_tfo->fabric_name, ref_tag);
+				pr_err("ABORT_TASK: Found referenced %s task_tag: %llu\n",
+				       se_cmd->se_tfo->fabric_name, ref_tag);
+			}
 
 			spin_lock(&se_sess->sess_cmd_lock);
 			rc = __target_check_io_state(se_cmd, se_sess, 0);
@@ -158,7 +160,11 @@ void core_tmr_abort_task(
 			       ref_tag);
 			tmr->response = TMR_FUNCTION_COMPLETE;
 			atomic_long_inc(&dev->aborts_complete);
-			return;
+
+			if (tmr->function == TMR_ABORT_TASK)
+				return;
+
+			spin_lock_irqsave(&dev->queues[i].lock, flags);
 		}
 		spin_unlock_irqrestore(&dev->queues[i].lock, flags);
 	}
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 7838dc20f713..8c386142ef90 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -3519,9 +3519,9 @@ static void target_tmr_work(struct work_struct *work)
 
 	switch (tmr->function) {
 	case TMR_ABORT_TASK:
+	case TMR_ABORT_TASK_SET:
 		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;
-- 
2.28.0