[PATCH v7 2/5] scsi: No retries on abort success

[Muneendra <muneendra.kumar@broadcom.com>]

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Added a new optional routine eh_should_retry_cmd
in scsi_host_template that allows the transport to decide if a
cmd is retryable.Return true if the transport is in a state the
cmd should be retried on.

Added a new interface scsi_eh_should_retry_cmd which checks and
calls the new routine eh_should_retry_cmd.

Made changes in scmd_eh_abort_handler and scsi_eh_flush_done_q which
calls the scsi_eh_should_retry_cmd to check whether the
command needs to be retried.

The above changes were done based on a patch by Mike Christie.

Signed-off-by: Muneendra <muneendra.kumar@broadcom.com>

---
v7:
Added New routine in scsi_host_template to decide if a cmd is
retryable instead of checking the same using  SCMD_NORETRIES_ABORT
bit as the cmd retry part can be checked by validating the port state.

Moved the DID_TRANSPORT_MARGINAL changes to previous patch
for reordering

v6:
Rearranged the patch by merging second hunk of the patch2 in v5
to this patch

v5:
added the DID_TRANSPORT_MARGINAL case to
scsi_decide_disposition
v4:
Modified the comments in the code appropriately

v3:
Merged  first part of the previous patch(v2 patch3) with
this patch.

v2:
set the hostbyte as DID_TRANSPORT_MARGINAL instead of
DID_TRANSPORT_FAILFAST.
---
 drivers/scsi/scsi_error.c | 17 +++++++++++++++--
 include/scsi/scsi_host.h  |  6 ++++++
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 28056ee498b3..1cdfa5a8ca09 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -124,6 +124,17 @@ static bool scsi_cmd_retry_allowed(struct scsi_cmnd *cmd)
 	return ++cmd->retries <= cmd->allowed;
 }
 
+static bool scsi_eh_should_retry_cmd(struct scsi_cmnd *cmd)
+{
+	struct scsi_device *sdev = cmd->device;
+	struct Scsi_Host *host = sdev->host;
+
+	if (host->hostt->eh_should_retry_cmd)
+		return  host->hostt->eh_should_retry_cmd(cmd);
+
+	return true;
+}
+
 /**
  * scmd_eh_abort_handler - Handle command aborts
  * @work:	command to be aborted.
@@ -159,7 +170,8 @@ scmd_eh_abort_handler(struct work_struct *work)
 						    "eh timeout, not retrying "
 						    "aborted command\n"));
 			} else if (!scsi_noretry_cmd(scmd) &&
-				   scsi_cmd_retry_allowed(scmd)) {
+				   scsi_cmd_retry_allowed(scmd) &&
+				scsi_eh_should_retry_cmd(scmd)) {
 				SCSI_LOG_ERROR_RECOVERY(3,
 					scmd_printk(KERN_WARNING, scmd,
 						    "retry aborted command\n"));
@@ -2111,7 +2123,8 @@ void scsi_eh_flush_done_q(struct list_head *done_q)
 	list_for_each_entry_safe(scmd, next, done_q, eh_entry) {
 		list_del_init(&scmd->eh_entry);
 		if (scsi_device_online(scmd->device) &&
-		    !scsi_noretry_cmd(scmd) && scsi_cmd_retry_allowed(scmd)) {
+		    !scsi_noretry_cmd(scmd) && scsi_cmd_retry_allowed(scmd) &&
+			scsi_eh_should_retry_cmd(scmd)) {
 			SCSI_LOG_ERROR_RECOVERY(3,
 				scmd_printk(KERN_INFO, scmd,
 					     "%s: flush retry cmd\n",
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 701f178b20ae..e30fd963b97d 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -314,6 +314,12 @@ struct scsi_host_template {
 	 * Status: OPTIONAL
 	 */
 	enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *);
+	/*
+	 * Optional routine that allows the transport to decide if a cmd
+	 * is retryable. Return true if the transport is in a state the
+	 * cmd should be retried on.
+	 */
+	bool (*eh_should_retry_cmd)(struct scsi_cmnd *scmd);
 
 	/* This is an optional routine that allows transport to initiate
 	 * LLD adapter or firmware reset using sysfs attribute.
-- 
2.26.2


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