scsi: device_handler: rdac: Have midlayer retry send_mode_select() errors

This has rdac have the SCSI midlayer retry errors instead of driving them
itself.

Signed-off-by: Mike Christie <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Acked-by: Christoph Hellwig <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: mikechristie

drivers/scsi/device_handler/scsi_dh_rdac.c

@@ -485,43 +485,17 @@ static int set_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h)
 static int mode_select_handle_sense(struct scsi_device *sdev,
 				    struct scsi_sense_hdr *sense_hdr)
 {
-	int err = SCSI_DH_IO;
 	struct rdac_dh_data *h = sdev->handler_data;
 
 	if (!scsi_sense_valid(sense_hdr))
-		goto done;
-
-	switch (sense_hdr->sense_key) {
-	case NO_SENSE:
-	case ABORTED_COMMAND:
-	case UNIT_ATTENTION:
-		err = SCSI_DH_RETRY;
-		break;
-	case NOT_READY:
-		if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x01)
-			/* LUN Not Ready and is in the Process of Becoming
-			 * Ready
-			 */
-			err = SCSI_DH_RETRY;
-		break;
-	case ILLEGAL_REQUEST:
-		if (sense_hdr->asc == 0x91 && sense_hdr->ascq == 0x36)
-			/*
-			 * Command Lock contention
-			 */
-			err = SCSI_DH_IMM_RETRY;
-		break;
-	default:
-		break;
-	}
+		return SCSI_DH_IO;
 
 	RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
 		"MODE_SELECT returned with sense %02x/%02x/%02x",
 		(char *) h->ctlr->array_name, h->ctlr->index,
 		sense_hdr->sense_key, sense_hdr->asc, sense_hdr->ascq);
 
-done:
-	return err;
+	return SCSI_DH_IO;
 }
 
 static void send_mode_select(struct work_struct *work)
@@ -530,16 +504,57 @@ static void send_mode_select(struct work_struct *work)
 		container_of(work, struct rdac_controller, ms_work);
 	struct scsi_device *sdev = ctlr->ms_sdev;
 	struct rdac_dh_data *h = sdev->handler_data;
-	int rc, err, retry_cnt = RDAC_RETRY_COUNT;
+	int rc, err;
 	struct rdac_queue_data *tmp, *qdata;
 	LIST_HEAD(list);
 	unsigned char cdb[MAX_COMMAND_SIZE];
 	struct scsi_sense_hdr sshdr;
 	unsigned int data_size;
 	blk_opf_t opf = REQ_OP_DRV_OUT | REQ_FAILFAST_DEV |
 				REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER;
+	struct scsi_failure failure_defs[] = {
+		{
+			.sense = NO_SENSE,
+			.asc = SCMD_FAILURE_ASC_ANY,
+			.ascq = SCMD_FAILURE_ASCQ_ANY,
+			.result = SAM_STAT_CHECK_CONDITION,
+		},
+		{
+			.sense = ABORTED_COMMAND,
+			.asc = SCMD_FAILURE_ASC_ANY,
+			.ascq = SCMD_FAILURE_ASCQ_ANY,
+			.result = SAM_STAT_CHECK_CONDITION,
+		},
+		{
+			.sense = UNIT_ATTENTION,
+			.asc = SCMD_FAILURE_ASC_ANY,
+			.ascq = SCMD_FAILURE_ASCQ_ANY,
+			.result = SAM_STAT_CHECK_CONDITION,
+		},
+		/* LUN Not Ready and is in the Process of Becoming Ready */
+		{
+			.sense = NOT_READY,
+			.asc = 0x04,
+			.ascq = 0x01,
+			.result = SAM_STAT_CHECK_CONDITION,
+		},
+		/* Command Lock contention */
+		{
+			.sense = ILLEGAL_REQUEST,
+			.asc = 0x91,
+			.ascq = 0x36,
+			.allowed = SCMD_FAILURE_NO_LIMIT,
+			.result = SAM_STAT_CHECK_CONDITION,
+		},
+		{}
+	};
+	struct scsi_failures failures = {
+		.total_allowed = RDAC_RETRY_COUNT,
+		.failure_definitions = failure_defs,
+	};
 	const struct scsi_exec_args exec_args = {
 		.sshdr = &sshdr,
+		.failures = &failures,
 	};
 
 	spin_lock(&ctlr->ms_lock);
@@ -548,15 +563,12 @@ static void send_mode_select(struct work_struct *work)
 	ctlr->ms_sdev = NULL;
 	spin_unlock(&ctlr->ms_lock);
 
- retry:
 	memset(cdb, 0, sizeof(cdb));
 
 	data_size = rdac_failover_get(ctlr, &list, cdb);
 
-	RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, "
-		"%s MODE_SELECT command",
-		(char *) h->ctlr->array_name, h->ctlr->index,
-		(retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying");
+	RDAC_LOG(RDAC_LOG_FAILOVER, sdev, "array %s, ctlr %d, queueing MODE_SELECT command",
+		(char *)h->ctlr->array_name, h->ctlr->index);
 
 	rc = scsi_execute_cmd(sdev, cdb, opf, &h->ctlr->mode_select, data_size,
 			      RDAC_TIMEOUT * HZ, RDAC_RETRIES, &exec_args);
@@ -570,10 +582,6 @@ static void send_mode_select(struct work_struct *work)
 		err = SCSI_DH_IO;
 	} else {
 		err = mode_select_handle_sense(sdev, &sshdr);
-		if (err == SCSI_DH_RETRY && retry_cnt--)
-			goto retry;
-		if (err == SCSI_DH_IMM_RETRY)
-			goto retry;
 	}
 
 	list_for_each_entry_safe(qdata, tmp, &list, entry) {