[PATCH RFC 12/22] scsi: rdac: Have scsi-ml retry send_mode_select errors

[Mike Christie <michael.christie@xxxxxxxxxx>]

This has rdac have scsi-ml retry errors instead of driving them itself.

Signed-off-by: Mike Christie <michael.christie@xxxxxxxxxx>
---
 drivers/scsi/device_handler/scsi_dh_rdac.c | 87 ++++++++++++----------
 1 file changed, 49 insertions(+), 38 deletions(-)

diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
index fce6886b8319..cedbc13af6ba 100644
--- a/drivers/scsi/device_handler/scsi_dh_rdac.c
+++ b/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)
@@ -530,7 +504,7 @@ 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 err = SCSI_DH_OK, retry_cnt = RDAC_RETRY_COUNT;
+	int err = SCSI_DH_OK;
 	struct rdac_queue_data *tmp, *qdata;
 	LIST_HEAD(list);
 	unsigned char cdb[MAX_COMMAND_SIZE];
@@ -538,6 +512,49 @@ static void send_mode_select(struct work_struct *work)
 	unsigned int data_size;
 	blk_opf_t req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
 		REQ_FAILFAST_DRIVER;
+	struct scsi_failure failures[] = {
+		{
+			/* Command Lock contention */
+			.sense = ILLEGAL_REQUEST,
+			.asc = 0x91,
+			.ascq = 0x36,
+			.allowed = SCMD_FAILURE_NO_LIMIT,
+			.result = SAM_STAT_CHECK_CONDITION,
+			},
+		{
+			.sense = NO_SENSE,
+			.asc = SCMD_FAILURE_ASC_ANY,
+			.ascq = SCMD_FAILURE_ASCQ_ANY,
+			.allowed = RDAC_RETRY_COUNT,
+			.result = SAM_STAT_CHECK_CONDITION,
+		},
+		{
+			.sense = ABORTED_COMMAND,
+			.asc = SCMD_FAILURE_ASC_ANY,
+			.ascq = SCMD_FAILURE_ASCQ_ANY,
+			.allowed = RDAC_RETRY_COUNT,
+			.result = SAM_STAT_CHECK_CONDITION,
+		},
+		{
+			.sense = UNIT_ATTENTION,
+			.asc = SCMD_FAILURE_ASC_ANY,
+			.ascq = SCMD_FAILURE_ASCQ_ANY,
+			.allowed = RDAC_RETRY_COUNT,
+			.result = SAM_STAT_CHECK_CONDITION,
+		},
+		{
+			/*
+			 * LUN Not Ready and is in the Process of Becoming
+			 * Ready
+			 */
+			.sense = NOT_READY,
+			.asc = 0x04,
+			.ascq = 0x01,
+			.allowed = RDAC_RETRY_COUNT,
+			.result = SAM_STAT_CHECK_CONDITION,
+		},
+		{},
+	};
 
 	spin_lock(&ctlr->ms_lock);
 	list_splice_init(&ctlr->ms_head, &list);
@@ -545,24 +562,18 @@ 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");
+		"MODE_SELECT command",
+		(char *) h->ctlr->array_name, h->ctlr->index);
 
 	if (scsi_execute(sdev, cdb, DMA_TO_DEVICE, &h->ctlr->mode_select,
 			 data_size, NULL, &sshdr, RDAC_TIMEOUT * HZ,
-			 RDAC_RETRIES, req_flags, 0, NULL, NULL)) {
+			 RDAC_RETRIES, req_flags, 0, NULL, failures)) {
 		err = mode_select_handle_sense(sdev, &sshdr);
-		if (err == SCSI_DH_RETRY && retry_cnt--)
-			goto retry;
-		if (err == SCSI_DH_IMM_RETRY)
-			goto retry;
 	}
 	if (err == SCSI_DH_OK) {
 		h->state = RDAC_STATE_ACTIVE;
-- 
2.25.1