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authorEddie Wai <eddie.wai@broadcom.com>2013-12-11 15:30:22 -0800
committerJames Bottomley <JBottomley@Parallels.com>2014-03-15 10:17:47 -0700
commit245a57542462f0cdbd28ca676bbce441e15178bf (patch)
tree83ab41c5adb898f3380f414cc7be769180620d0c /drivers/scsi/bnx2fc
parent06c4f20d2814b534eb4fb993d0db9259b24372b9 (diff)
downloadop-kernel-dev-245a57542462f0cdbd28ca676bbce441e15178bf.zip
op-kernel-dev-245a57542462f0cdbd28ca676bbce441e15178bf.tar.gz
[SCSI] bnx2fc: Fixed the handling for the SCSI retry delay
SCSI retry delay upon SAM_STAT_BUSY/_SET_FULL was not being handled in bnx2fc. This patch adds such handling by returning TARGET_BUSY to the SCSI ML for the corresponding LUN until the retry timer expires. Signed-off-by: Eddie Wai <eddie.wai@broadcom.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/bnx2fc')
-rw-r--r--drivers/scsi/bnx2fc/bnx2fc.h1
-rw-r--r--drivers/scsi/bnx2fc/bnx2fc_io.c19
-rw-r--r--drivers/scsi/bnx2fc/bnx2fc_tgt.c1
3 files changed, 20 insertions, 1 deletions
diff --git a/drivers/scsi/bnx2fc/bnx2fc.h b/drivers/scsi/bnx2fc/bnx2fc.h
index 1ebf3fb..2e984e3 100644
--- a/drivers/scsi/bnx2fc/bnx2fc.h
+++ b/drivers/scsi/bnx2fc/bnx2fc.h
@@ -367,6 +367,7 @@ struct bnx2fc_rport {
atomic_t num_active_ios;
u32 flush_in_prog;
unsigned long timestamp;
+ unsigned long retry_delay_timestamp;
struct list_head free_task_list;
struct bnx2fc_cmd *pending_queue[BNX2FC_SQ_WQES_MAX+1];
struct list_head active_cmd_queue;
diff --git a/drivers/scsi/bnx2fc/bnx2fc_io.c b/drivers/scsi/bnx2fc/bnx2fc_io.c
index ed88089..d2cabc9 100644
--- a/drivers/scsi/bnx2fc/bnx2fc_io.c
+++ b/drivers/scsi/bnx2fc/bnx2fc_io.c
@@ -1871,7 +1871,15 @@ int bnx2fc_queuecommand(struct Scsi_Host *host,
rc = SCSI_MLQUEUE_TARGET_BUSY;
goto exit_qcmd;
}
-
+ if (tgt->retry_delay_timestamp) {
+ if (time_after(jiffies, tgt->retry_delay_timestamp)) {
+ tgt->retry_delay_timestamp = 0;
+ } else {
+ /* If retry_delay timer is active, flow off the ML */
+ rc = SCSI_MLQUEUE_TARGET_BUSY;
+ goto exit_qcmd;
+ }
+ }
io_req = bnx2fc_cmd_alloc(tgt);
if (!io_req) {
rc = SCSI_MLQUEUE_HOST_BUSY;
@@ -1961,6 +1969,15 @@ void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
" fcp_resid = 0x%x\n",
io_req->cdb_status, io_req->fcp_resid);
sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
+
+ if (io_req->cdb_status == SAM_STAT_TASK_SET_FULL ||
+ io_req->cdb_status == SAM_STAT_BUSY) {
+ /* Set the jiffies + retry_delay_timer * 100ms
+ for the rport/tgt */
+ tgt->retry_delay_timestamp = jiffies +
+ fcp_rsp->retry_delay_timer * HZ / 10;
+ }
+
}
if (io_req->fcp_resid)
scsi_set_resid(sc_cmd, io_req->fcp_resid);
diff --git a/drivers/scsi/bnx2fc/bnx2fc_tgt.c b/drivers/scsi/bnx2fc/bnx2fc_tgt.c
index 4d93177..68948b7 100644
--- a/drivers/scsi/bnx2fc/bnx2fc_tgt.c
+++ b/drivers/scsi/bnx2fc/bnx2fc_tgt.c
@@ -386,6 +386,7 @@ static int bnx2fc_init_tgt(struct bnx2fc_rport *tgt,
tgt->rq_prod_idx = 0x8000;
tgt->rq_cons_idx = 0;
atomic_set(&tgt->num_active_ios, 0);
+ tgt->retry_delay_timestamp = 0;
if (rdata->flags & FC_RP_FLAGS_RETRY &&
rdata->ids.roles & FC_RPORT_ROLE_FCP_TARGET &&
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