iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

scsi: bnx2fc: Handle scope bits when array returns BUSY or TSF

Browse Source 
The qla2xxx driver had this issue as well when the newer array firmware
returned the retry_delay_timer in the fcp_rsp.  The bnx2fc is not handling
the masking of the scope bits either so the retry_delay_timestamp value
lands up being a large value added to the timer timestamp delaying I/O for
up to 27 Minutes.  This patch adds similar code to handle this to the
bnx2fc driver to avoid the huge delay.

Link: https://lore.kernel.org/r/1568210202-12794-1-git-send-email-loberman@redhat.com
Signed-off-by: Laurence Oberman <loberman@redhat.com>
Reported-by: David Jeffery <djeffery@redhat.com>
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Laurence Oberman 2019-09-11 09:56:42 -04:00 committed by Martin K. Petersen
parent e74006edd0
commit c9c5374937
1 changed files with 24 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
drivers/scsi/bnx2fc/bnx2fc_io.c
View File

@ -1923,6 +1923,7 @@ void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
struct fcoe_fcp_rsp_payload *fcp_rsp;
struct bnx2fc_rport *tgt = io_req->tgt;
struct scsi_cmnd *sc_cmd;
u16 scope = 0, qualifier = 0;
/* scsi_cmd_cmpl is called with tgt lock held */
@ -1990,12 +1991,30 @@ void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
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;
/* Newer array firmware with BUSY or
* TASK_SET_FULL may return a status that needs
* the scope bits masked.
* Or a huge delay timestamp up to 27 minutes
* can result.
*/
if (fcp_rsp->retry_delay_timer) {
/* Upper 2 bits */
scope = fcp_rsp->retry_delay_timer
& 0xC000;
/* Lower 14 bits */
qualifier = fcp_rsp->retry_delay_timer
& 0x3FFF;
}
if (scope > 0 && qualifier > 0 &&
qualifier <= 0x3FEF) {
/* Set the jiffies +
* retry_delay_timer * 100ms
* for the rport/tgt
*/
tgt->retry_delay_timestamp = jiffies +
(qualifier * HZ / 10);
}
}
}
if (io_req->fcp_resid)
scsi_set_resid(sc_cmd, io_req->fcp_resid);