[PATCH 07/11] qla2xxx: edif: add retry for els pass through

[Nilesh Javali <njavali@xxxxxxxxxxx>]

From: Quinn Tran <qutran@xxxxxxxxxxx>

Relating to EDIF, when sending IKE message, updating
key or deleting key, driver can encounter IOCB queue full. Add
additional retries to reduce higher level recovery.

Fixes: dd30706e73b70 ("scsi: qla2xxx: edif: Add key update")
Signed-off-by: Quinn Tran <qutran@xxxxxxxxxxx>
Signed-off-by: Nilesh Javali <njavali@xxxxxxxxxxx>
---
 drivers/scsi/qla2xxx/qla_edif.c | 52 +++++++++++++++++++++++----------
 drivers/scsi/qla2xxx/qla_os.c   |  2 +-
 2 files changed, 38 insertions(+), 16 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_edif.c b/drivers/scsi/qla2xxx/qla_edif.c
index c9f6ec49b0b4..142feda0381f 100644
--- a/drivers/scsi/qla2xxx/qla_edif.c
+++ b/drivers/scsi/qla2xxx/qla_edif.c
@@ -1467,6 +1467,8 @@ qla24xx_check_sadb_avail_slot(struct bsg_job *bsg_job, fc_port_t *fcport,
 
 #define QLA_SA_UPDATE_FLAGS_RX_KEY      0x0
 #define QLA_SA_UPDATE_FLAGS_TX_KEY      0x2
+#define EDIF_MSLEEP_INTERVAL 100
+#define EDIF_RETRY_COUNT  50
 
 int
 qla24xx_sadb_update(struct bsg_job *bsg_job)
@@ -1479,7 +1481,7 @@ qla24xx_sadb_update(struct bsg_job *bsg_job)
 	struct edif_list_entry *edif_entry = NULL;
 	int			found = 0;
 	int			rval = 0;
-	int result = 0;
+	int result = 0, cnt;
 	struct qla_sa_update_frame sa_frame;
 	struct srb_iocb *iocb_cmd;
 	port_id_t portid;
@@ -1720,11 +1722,23 @@ qla24xx_sadb_update(struct bsg_job *bsg_job)
 	sp->done = qla2x00_bsg_job_done;
 	iocb_cmd = &sp->u.iocb_cmd;
 	iocb_cmd->u.sa_update.sa_frame  = sa_frame;
-
+	cnt = 0;
+retry:
 	rval = qla2x00_start_sp(sp);
-	if (rval != QLA_SUCCESS) {
+	switch (rval) {
+	case QLA_SUCCESS:
+		break;
+	case EAGAIN:
+		msleep(EDIF_MSLEEP_INTERVAL);
+		cnt++;
+		if (cnt < EDIF_RETRY_COUNT)
+			goto retry;
+
+		fallthrough;
+	default:
 		ql_log(ql_dbg_edif, vha, 0x70e3,
-		    "qla2x00_start_sp failed=%d.\n", rval);
+		       "%s qla2x00_start_sp failed=%d.\n",
+		       __func__, rval);
 
 		qla2x00_rel_sp(sp);
 		rval = -EIO;
@@ -2398,7 +2412,6 @@ qla24xx_issue_sa_replace_iocb(scsi_qla_host_t *vha, struct qla_work_evt *e)
 	rval = qla2x00_start_sp(sp);
 
 	if (rval != QLA_SUCCESS) {
-		rval = QLA_FUNCTION_FAILED;
 		goto done_free_sp;
 	}
 
@@ -3530,7 +3543,7 @@ int qla_edif_process_els(scsi_qla_host_t *vha, struct bsg_job *bsg_job)
 	fc_port_t *fcport = NULL;
 	struct qla_hw_data *ha = vha->hw;
 	srb_t *sp;
-	int rval =  (DID_ERROR << 16);
+	int rval =  (DID_ERROR << 16), cnt;
 	port_id_t d_id;
 	struct qla_bsg_auth_els_request *p =
 	    (struct qla_bsg_auth_els_request *)bsg_job->request;
@@ -3625,17 +3638,26 @@ int qla_edif_process_els(scsi_qla_host_t *vha, struct bsg_job *bsg_job)
 	sp->free = qla2x00_bsg_sp_free;
 	sp->done = qla2x00_bsg_job_done;
 
+	cnt = 0;
+retry:
 	rval = qla2x00_start_sp(sp);
-
-	ql_dbg(ql_dbg_edif, vha, 0x700a,
-	    "%s %s %8phN xchg %x ctlflag %x hdl %x reqlen %xh bsg ptr %p\n",
-	    __func__, sc_to_str(p->e.sub_cmd), fcport->port_name,
-	    p->e.extra_rx_xchg_address, p->e.extra_control_flags,
-	    sp->handle, sp->remap.req.len, bsg_job);
-
-	if (rval != QLA_SUCCESS) {
+	switch (rval) {
+	case QLA_SUCCESS:
+		ql_dbg(ql_dbg_edif, vha, 0x700a,
+		       "%s %s %8phN xchg %x ctlflag %x hdl %x reqlen %xh bsg ptr %p\n",
+		       __func__, sc_to_str(p->e.sub_cmd), fcport->port_name,
+		       p->e.extra_rx_xchg_address, p->e.extra_control_flags,
+		       sp->handle, sp->remap.req.len, bsg_job);
+		break;
+	case EAGAIN:
+		msleep(EDIF_MSLEEP_INTERVAL);
+		cnt++;
+		if (cnt < EDIF_RETRY_COUNT)
+			goto retry;
+		fallthrough;
+	default:
 		ql_log(ql_log_warn, vha, 0x700e,
-		    "qla2x00_start_sp failed = %d\n", rval);
+		    "%s qla2x00_start_sp failed = %d\n", __func__, rval);
 		SET_DID_STATUS(bsg_reply->result, DID_IMM_RETRY);
 		rval = -EIO;
 		goto done_free_remap_rsp;
diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index 73073fb08369..4f3125b826c4 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -5472,7 +5472,7 @@ qla2x00_do_work(struct scsi_qla_host *vha)
 			    e->u.fcport.fcport, false);
 			break;
 		case QLA_EVT_SA_REPLACE:
-			qla24xx_issue_sa_replace_iocb(vha, e);
+			rc = qla24xx_issue_sa_replace_iocb(vha, e);
 			break;
 		}
 
-- 
2.19.0.rc0