[PATCH 17/24] snic: reserve tag for TMF

Hannes Reinecke
2022-05-02T21:39:32Z

Rather than re-using the failed command the snic driver should
reserve one command for TMFs.

Signed-off-by: Hannes Reinecke <hare@suse.com>
---
drivers/scsi/snic/snic.h | 3 ++-
drivers/scsi/snic/snic_main.c | 3 +++
drivers/scsi/snic/snic_scsi.c | 43 +++++++++++++++++------------------
3 files changed, 26 insertions(+), 23 deletions(-)

diff --git a/drivers/scsi/snic/snic.h b/drivers/scsi/snic/snic.h
index 4ec7e30678e1..e40492d36031 100644
--- a/drivers/scsi/snic/snic.h
+++ b/drivers/scsi/snic/snic.h
@@ -310,6 +310,7 @@ struct snic {
struct list_head spl_cmd_list;

unsigned int max_tag_id;
+ unsigned int tmf_tag_id;
atomic_t ios_inflight; /* io in flight counter */

struct vnic_snic_config config;
@@ -380,7 +381,7 @@ int snic_queuecommand(struct Scsi_Host *, struct scsi_cmnd *);
int snic_abort_cmd(struct scsi_cmnd *);
int snic_device_reset(struct scsi_cmnd *);
int snic_host_reset(struct scsi_cmnd *);
-int snic_reset(struct Scsi_Host *, struct scsi_cmnd *);
+int snic_reset(struct Scsi_Host *);
void snic_shutdown_scsi_cleanup(struct snic *);

diff --git a/drivers/scsi/snic/snic_main.c b/drivers/scsi/snic/snic_main.c
index 29d56396058c..f344cbc27923 100644
--- a/drivers/scsi/snic/snic_main.c
+++ b/drivers/scsi/snic/snic_main.c
@@ -512,6 +512,9 @@ snic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
max_t(u32, SNIC_MIN_IO_REQ, max_ios));

snic->max_tag_id = shost->can_queue;
+ /* Reserve one reset command */
+ shost->can_queue--;
+ snic->tmf_tag_id = shost->can_queue;

shost->max_lun = snic->config.luns_per_tgt;
shost->max_id = SNIC_MAX_TARGET;
diff --git a/drivers/scsi/snic/snic_scsi.c b/drivers/scsi/snic/snic_scsi.c
index 5f17666f3e1d..e18c8c5e4b46 100644
--- a/drivers/scsi/snic/snic_scsi.c
+++ b/drivers/scsi/snic/snic_scsi.c
@@ -1018,17 +1018,6 @@ snic_hba_reset_cmpl_handler(struct snic *snic, struct snic_fw_req *fwreq)
"reset_cmpl: type = %x, hdr_stat = %x, cmnd_id = %x, hid = %x, ctx = %lx\n",
typ, hdr_stat, cmnd_id, hid, ctx);

- /* spl case, host reset issued through ioctl */
- if (cmnd_id == SCSI_NO_TAG) {
- rqi = (struct snic_req_info *) ctx;
- SNIC_HOST_INFO(snic->shost,
- "reset_cmpl:Tag %d ctx %lx cmpl stat %s\n",
- cmnd_id, ctx, snic_io_status_to_str(hdr_stat));
- sc = rqi->sc;
-
- goto ioctl_hba_rst;
- }
-
if (cmnd_id >= snic->max_tag_id) {
SNIC_HOST_ERR(snic->shost,
"reset_cmpl: Tag 0x%x out of Range,HdrStat %s\n",
@@ -1039,7 +1028,6 @@ snic_hba_reset_cmpl_handler(struct snic *snic, struct snic_fw_req *fwreq)
}

sc = scsi_host_find_tag(snic->shost, cmnd_id);
-ioctl_hba_rst:
if (!sc) {
atomic64_inc(&snic->s_stats.io.sc_null);
SNIC_HOST_ERR(snic->shost,
@@ -1725,7 +1713,7 @@ snic_dr_clean_single_req(struct snic *snic,
{
struct snic_req_info *rqi = NULL;
struct snic_tgt *tgt = NULL;
- struct scsi_cmnd *sc = NULL;
+ struct scsi_cmnd *sc;
spinlock_t *io_lock = NULL;
u32 sv_state = 0, tmf = 0;
DECLARE_COMPLETION_ONSTACK(tm_done);
@@ -2238,13 +2226,6 @@ snic_issue_hba_reset(struct snic *snic, struct scsi_cmnd *sc)
goto hba_rst_end;
}

- if (snic_cmd_tag(sc) == SCSI_NO_TAG) {
- memset(scsi_cmd_priv(sc), 0,
- sizeof(struct snic_internal_io_state));
- SNIC_HOST_INFO(snic->shost, "issu_hr:Host reset thru ioctl.\n");
- rqi->sc = sc;
- }
-
req = rqi_to_req(rqi);

io_lock = snic_io_lock_hash(snic, sc);
@@ -2319,11 +2300,13 @@ snic_issue_hba_reset(struct snic *snic, struct scsi_cmnd *sc)
} /* end of snic_issue_hba_reset */

int
-snic_reset(struct Scsi_Host *shost, struct scsi_cmnd *sc)
+snic_reset(struct Scsi_Host *shost)
{
struct snic *snic = shost_priv(shost);
+ struct scsi_cmnd *sc = NULL;
enum snic_state sv_state;
unsigned long flags;
+ u32 start_time = jiffies;
int ret = FAILED;

/* Set snic state as SNIC_FWRESET*/
@@ -2348,6 +2331,18 @@ snic_reset(struct Scsi_Host *shost, struct scsi_cmnd *sc)
while (atomic_read(&snic->ios_inflight))
schedule_timeout(msecs_to_jiffies(1));

+ sc = scsi_host_find_tag(shost, snic->tmf_tag_id);
+ if (!sc) {
+ SNIC_HOST_ERR(shost,
+ "reset:Host Reset Failed to allocate sc.\n");
+ spin_lock_irqsave(&snic->snic_lock, flags);
+ snic_set_state(snic, sv_state);
+ spin_unlock_irqrestore(&snic->snic_lock, flags);
+ atomic64_inc(&snic->s_stats.reset.hba_reset_fail);
+ ret = FAILED;
+
+ goto reset_end;
+ }
ret = snic_issue_hba_reset(snic, sc);
if (ret) {
SNIC_HOST_ERR(shost,
@@ -2365,6 +2360,10 @@ snic_reset(struct Scsi_Host *shost, struct scsi_cmnd *sc)
ret = SUCCESS;

reset_end:
+ SNIC_TRC(shost->host_no, sc ? snic_cmd_tag(sc) : SCSI_NO_TAG,
+ (ulong) sc, jiffies_to_msecs(jiffies - start_time),
+ 0, 0, 0);
+
return ret;
} /* end of snic_reset */

@@ -2387,7 +2386,7 @@ snic_host_reset(struct scsi_cmnd *sc)
sc, sc->cmnd[0], scsi_cmd_to_rq(sc),
snic_cmd_tag(sc), CMD_FLAGS(sc));

- ret = snic_reset(shost, sc);
+ ret = snic_reset(shost);

SNIC_TRC(shost->host_no, snic_cmd_tag(sc), (ulong) sc,
jiffies_to_msecs(jiffies - start_time),
--
2.29.2