[PATCH 11/11] csiostor: use separate TMF command

Hannes Reinecke
2022-05-02T22:02:25Z

Set one command aside as a TMF command, and use this command to
send the TMF. This avoids having to rely on the passed-in scsi
command when resetting the device.

Signed-off-by: Hannes Reinecke <hare@suse.com>
---
drivers/scsi/csiostor/csio_hw.h | 2 ++
drivers/scsi/csiostor/csio_init.c | 2 +-
drivers/scsi/csiostor/csio_scsi.c | 48 +++++++++++++++++++------------
3 files changed, 33 insertions(+), 19 deletions(-)

diff --git a/drivers/scsi/csiostor/csio_hw.h b/drivers/scsi/csiostor/csio_hw.h
index e351af6e7c81..8e22dccd6d88 100644
--- a/drivers/scsi/csiostor/csio_hw.h
+++ b/drivers/scsi/csiostor/csio_hw.h
@@ -68,6 +68,8 @@

#define CSIO_MAX_LUN 0xFFFF
#define CSIO_MAX_QUEUE 2048
+#define CSIO_TMF_TAG (CSIO_MAX_QUEUE - 1)
+
#define CSIO_MAX_CMD_PER_LUN 32
#define CSIO_MAX_DDP_BUF_SIZE (1024 * 1024)
#define CSIO_MAX_SECTOR_SIZE 128
diff --git a/drivers/scsi/csiostor/csio_init.c b/drivers/scsi/csiostor/csio_init.c
index ccbded3353bd..6a5529d6440f 100644
--- a/drivers/scsi/csiostor/csio_init.c
+++ b/drivers/scsi/csiostor/csio_init.c
@@ -621,7 +621,7 @@ csio_shost_init(struct csio_hw *hw, struct device *dev,
/* Link common lnode to this lnode */
ln->dev_num = (shost->host_no << 16);

- shost->can_queue = CSIO_MAX_QUEUE;
+ shost->can_queue = CSIO_MAX_QUEUE - 1;
shost->this_id = -1;
shost->unique_id = shost->host_no;
shost->max_cmd_len = 16; /* Max CDB length supported */
diff --git a/drivers/scsi/csiostor/csio_scsi.c b/drivers/scsi/csiostor/csio_scsi.c
index c1c410a1cfe0..b21aa2c43051 100644
--- a/drivers/scsi/csiostor/csio_scsi.c
+++ b/drivers/scsi/csiostor/csio_scsi.c
@@ -2056,17 +2056,20 @@ csio_tm_cbfn(struct csio_hw *hw, struct csio_ioreq *req)

/* Wake up the TM handler thread */
csio_scsi_cmnd(req) = NULL;
+ cmnd->host_scribble = NULL;
}

static int
csio_eh_lun_reset_handler(struct scsi_cmnd *cmnd)
{
- struct csio_lnode *ln = shost_priv(cmnd->device->host);
+ struct scsi_device *sdev = cmnd->device;
+ struct csio_lnode *ln = shost_priv(sdev->host);
struct csio_hw *hw = csio_lnode_to_hw(ln);
struct csio_scsim *scsim = csio_hw_to_scsim(hw);
- struct csio_rnode *rn = (struct csio_rnode *)(cmnd->device->hostdata);
+ struct csio_rnode *rn = (struct csio_rnode *)(sdev->hostdata);
struct csio_ioreq *ioreq = NULL;
struct csio_scsi_qset *sqset;
+ struct scsi_cmnd *tmf_cmnd;
unsigned long flags;
int retval;
int count, ret;
@@ -2077,13 +2080,13 @@ csio_eh_lun_reset_handler(struct scsi_cmnd *cmnd)
goto fail;

csio_dbg(hw, "Request to reset LUN:%llu (ssni:0x%x tgtid:%d)\n",
- cmnd->device->lun, rn->flowid, rn->scsi_id);
+ sdev->lun, rn->flowid, rn->scsi_id);

if (!csio_is_lnode_ready(ln)) {
csio_err(hw,
"LUN reset cannot be issued on non-ready"
" local node vnpi:0x%x (LUN:%llu)\n",
- ln->vnp_flowid, cmnd->device->lun);
+ ln->vnp_flowid, sdev->lun);
goto fail;
}

@@ -2103,7 +2106,15 @@ csio_eh_lun_reset_handler(struct scsi_cmnd *cmnd)
csio_err(hw,
"LUN reset cannot be issued on non-ready"
" remote node ssni:0x%x (LUN:%llu)\n",
- rn->flowid, cmnd->device->lun);
+ rn->flowid, sdev->lun);
+ goto fail;
+ }
+
+ tmf_cmnd = scsi_host_find_tag(sdev->host, CSIO_TMF_TAG);
+ if (!tmf_cmnd || tmf_cmnd->host_scribble) {
+ csio_err(hw,
+ "LUN reset TMF already busy (LUN:%llu)\n",
+ sdev->lun);
goto fail;
}

@@ -2123,11 +2134,11 @@ csio_eh_lun_reset_handler(struct scsi_cmnd *cmnd)
ioreq->iq_idx = sqset->iq_idx;
ioreq->eq_idx = sqset->eq_idx;

- csio_scsi_cmnd(ioreq) = cmnd;
- cmnd->host_scribble = (unsigned char *)ioreq;
- csio_priv(cmnd)->wr_status = 0;
+ csio_scsi_cmnd(ioreq) = tmf_cmnd;
+ tmf_cmnd->host_scribble = (unsigned char *)ioreq;
+ csio_priv(tmf_cmnd)->wr_status = 0;

- csio_priv(cmnd)->fc_tm_flags = FCP_TMF_LUN_RESET;
+ csio_priv(tmf_cmnd)->fc_tm_flags = FCP_TMF_LUN_RESET;
ioreq->tmo = CSIO_SCSI_LUNRST_TMO_MS / 1000;

/*
@@ -2144,7 +2155,7 @@ csio_eh_lun_reset_handler(struct scsi_cmnd *cmnd)
sld.level = CSIO_LEV_LUN;
sld.lnode = ioreq->lnode;
sld.rnode = ioreq->rnode;
- sld.oslun = cmnd->device->lun;
+ sld.oslun = sdev->lun;

spin_lock_irqsave(&hw->lock, flags);
/* Kick off TM SM on the ioreq */
@@ -2154,20 +2165,21 @@ csio_eh_lun_reset_handler(struct scsi_cmnd *cmnd)
if (retval != 0) {
csio_err(hw, "Failed to issue LUN reset, req:%p, status:%d\n",
ioreq, retval);
+ tmf_cmnd->host_scribble = NULL;
goto fail_ret_ioreq;
}

csio_dbg(hw, "Waiting max %d secs for LUN reset completion\n",
count * (CSIO_SCSI_TM_POLL_MS / 1000));
/* Wait for completion */
- while ((((struct scsi_cmnd *)csio_scsi_cmnd(ioreq)) == cmnd)
+ while ((((struct scsi_cmnd *)csio_scsi_cmnd(ioreq)) == tmf_cmnd)
&& count--)
msleep(CSIO_SCSI_TM_POLL_MS);

/* LUN reset timed-out */
- if (((struct scsi_cmnd *)csio_scsi_cmnd(ioreq)) == cmnd) {
+ if (((struct scsi_cmnd *)csio_scsi_cmnd(ioreq)) == tmf_cmnd) {
csio_err(hw, "LUN reset (%d:%llu) timed out\n",
- cmnd->device->id, cmnd->device->lun);
+ sdev->id, sdev->lun);

spin_lock_irq(&hw->lock);
csio_scsi_drvcleanup(ioreq);
@@ -2178,10 +2190,10 @@ csio_eh_lun_reset_handler(struct scsi_cmnd *cmnd)
}

/* LUN reset returned, check cached status */
- if (csio_priv(cmnd)->wr_status != FW_SUCCESS) {
+ if (csio_priv(tmf_cmnd)->wr_status != FW_SUCCESS) {
csio_err(hw, "LUN reset failed (%d:%llu), status: %d\n",
- cmnd->device->id, cmnd->device->lun,
- csio_priv(cmnd)->wr_status);
+ sdev->id, sdev->lun,
+ csio_priv(tmf_cmnd)->wr_status);
goto fail;
}

@@ -2201,7 +2213,7 @@ csio_eh_lun_reset_handler(struct scsi_cmnd *cmnd)
if (retval != 0) {
csio_err(hw,
"Attempt to abort I/Os during LUN reset of %llu"
- " returned %d\n", cmnd->device->lun, retval);
+ " returned %d\n", sdev->lun, retval);
/* Return I/Os back to active_q */
spin_lock_irq(&hw->lock);
list_splice_tail_init(&local_q, &scsim->active_q);
@@ -2212,7 +2224,7 @@ csio_eh_lun_reset_handler(struct scsi_cmnd *cmnd)
CSIO_INC_STATS(rn, n_lun_rst);

csio_info(hw, "LUN reset occurred (%d:%llu)\n",
- cmnd->device->id, cmnd->device->lun);
+ sdev->id, sdev->lun);

return SUCCESS;

--
2.29.2