From: Darren Trapp <darren.trapp@xxxxxxxxxx>
This patch adds mechanism to return EBUSY if rport is going away
to prevent exhausting FC-NVMe layer's retry counter.
Signed-off-by: Darren Trapp <darren.trapp@xxxxxxxxxx>
Signed-off-by: Himanshu Madhani <himanshu.madhani@xxxxxxxxxx>
Reviewed-by: Hannes Reinecke <hare@xxxxxxxx>
---
drivers/scsi/qla2xxx/qla_def.h | 1 +
drivers/scsi/qla2xxx/qla_isr.c | 4 +++-
drivers/scsi/qla2xxx/qla_nvme.c | 31 ++++++++++++++++++++-----------
3 files changed, 24 insertions(+), 12 deletions(-)
diff --git a/drivers/scsi/qla2xxx/qla_def.h b/drivers/scsi/qla2xxx/qla_def.h
index 745e6414b496..944626cc84d9 100644
--- a/drivers/scsi/qla2xxx/qla_def.h
+++ b/drivers/scsi/qla2xxx/qla_def.h
@@ -2357,6 +2357,7 @@ typedef struct fc_port {
uint8_t nvme_flag;
#define NVME_FLAG_REGISTERED 4
#define NVME_FLAG_DELETING 2
+#define NVME_FLAG_RESETTING 1
struct fc_port *conflict;
unsigned char logout_completed;
diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index d973d0b5d8c3..07c98eb911fd 100644
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -1911,9 +1911,11 @@ qla24xx_nvme_iocb_entry(scsi_qla_host_t *vha, struct req_que *req, void *tsk)
ret = QLA_SUCCESS;
break;
- case CS_ABORTED:
case CS_RESET:
case CS_PORT_UNAVAILABLE:
+ fcport->nvme_flag |= NVME_FLAG_RESETTING;
+ /* fall through */
+ case CS_ABORTED:
case CS_PORT_LOGGED_OUT:
case CS_PORT_BUSY:
ql_log(ql_log_warn, fcport->vha, 0x5060,
diff --git a/drivers/scsi/qla2xxx/qla_nvme.c b/drivers/scsi/qla2xxx/qla_nvme.c
index 951fbbab961f..adeda6a4e4fd 100644
--- a/drivers/scsi/qla2xxx/qla_nvme.c
+++ b/drivers/scsi/qla2xxx/qla_nvme.c
@@ -36,6 +36,7 @@ int qla_nvme_register_remote(struct scsi_qla_host *vha, struct fc_port *fcport)
return 0;
INIT_WORK(&fcport->nvme_del_work, qla_nvme_unregister_remote_port);
+ fcport->nvme_flag &= ~NVME_FLAG_RESETTING;
memset(&req, 0, sizeof(struct nvme_fc_port_info));
req.port_name = wwn_to_u64(fcport->port_name);
@@ -193,9 +194,9 @@ static void qla_nvme_abort_work(struct work_struct *work)
rval = ha->isp_ops->abort_command(sp);
ql_dbg(ql_dbg_io, fcport->vha, 0x212b,
- "%s: %s command for sp=%p on fcport=%p rval=%x\n", __func__,
- (rval != QLA_SUCCESS) ? "Failed to abort" : "Aborted",
- sp, fcport, rval);
+ "%s: %s command for sp=%p, handle=%x on fcport=%p rval=%x\n",
+ __func__, (rval != QLA_SUCCESS) ? "Failed to abort" : "Aborted",
+ sp, sp->handle, fcport, rval);
}
static void qla_nvme_ls_abort(struct nvme_fc_local_port *lport,
@@ -327,7 +328,7 @@ static int qla2x00_start_nvme_mq(srb_t *sp)
}
if (index == req->num_outstanding_cmds) {
- rval = -1;
+ rval = -EBUSY;
goto queuing_error;
}
req_cnt = qla24xx_calc_iocbs(vha, tot_dsds);
@@ -341,7 +342,7 @@ static int qla2x00_start_nvme_mq(srb_t *sp)
req->cnt = req->length - (req->ring_index - cnt);
if (req->cnt < (req_cnt + 2)){
- rval = -1;
+ rval = -EBUSY;
goto queuing_error;
}
}
@@ -476,14 +477,15 @@ static int qla_nvme_post_cmd(struct nvme_fc_local_port *lport,
fc_port_t *fcport;
struct srb_iocb *nvme;
struct scsi_qla_host *vha;
- int rval = QLA_FUNCTION_FAILED;
+ int rval = -ENODEV;
srb_t *sp;
struct qla_qpair *qpair = hw_queue_handle;
struct nvme_private *priv;
struct qla_nvme_rport *qla_rport = rport->private;
- if (!fd) {
- ql_log(ql_log_warn, NULL, 0x2134, "NO NVMe FCP request\n");
+ if (!fd || !qpair) {
+ ql_log(ql_log_warn, NULL, 0x2134,
+ "NO NVMe request or Queue Handle\n");
return rval;
}
@@ -495,13 +497,21 @@ static int qla_nvme_post_cmd(struct nvme_fc_local_port *lport,
}
vha = fcport->vha;
- if (!qpair)
+
+ /*
+ * If we know the dev is going away while the transport is still sending
+ * IO's return busy back to stall the IO Q. This happens when the
+ * link goes away and fw hasn't notified us yet, but IO's are being
+ * returned. If the dev comes back quickly we won't exhaust the IO
+ * retry count at the core.
+ */
+ if (fcport->nvme_flag & NVME_FLAG_RESETTING)
return -EBUSY;
/* Alloc SRB structure */
sp = qla2xxx_get_qpair_sp(qpair, fcport, GFP_ATOMIC);
if (!sp)
- return -EIO;
+ return -EBUSY;
atomic_set(&sp->ref_count, 1);
init_waitqueue_head(&sp->nvme_ls_waitq);
@@ -519,7 +529,6 @@ static int qla_nvme_post_cmd(struct nvme_fc_local_port *lport,
"qla2x00_start_nvme_mq failed = %d\n", rval);
atomic_dec(&sp->ref_count);
wake_up(&sp->nvme_ls_waitq);
- return -EIO;
}
return rval;
--
2.12.0
