On Fri, 2019-09-06 at 16:26 -0400, Laurence Oberman wrote:
> 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.
>
> Signed-off-by: Laurence Oberman <lober...@redhat.com>
> ---
> drivers/scsi/bnx2fc/bnx2fc_io.c | 23 ++++++++++++++++++++---
> 1 file changed, 20 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/scsi/bnx2fc/bnx2fc_io.c
> b/drivers/scsi/bnx2fc/bnx2fc_io.c
> index 9e50e5b..39f4aeb 100644
> --- a/drivers/scsi/bnx2fc/bnx2fc_io.c
> +++ b/drivers/scsi/bnx2fc/bnx2fc_io.c
> @@ -1928,6 +1928,7 @@ void bnx2fc_process_scsi_cmd_compl(struct
> bnx2fc_cmd *io_req,
> struct bnx2fc_rport *tgt = io_req->tgt;
> struct scsi_cmnd *sc_cmd;
> struct Scsi_Host *host;
> + u16 scope, qualifier = 0;
>
>
> /* scsi_cmd_cmpl is called with tgt lock held */
> @@ -1997,12 +1998,28 @@ 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) {
> + /* 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 +
> - fcp_rsp->retry_delay_timer * HZ
> / 10;
> + tgt->retry_delay_timestamp =
> jiffies +
> + (qualifier * HZ / 10);
> + }
> }
> -
> }
> if (io_req->fcp_resid)
> scsi_set_resid(sc_cmd, io_req->fcp_resid);
What better thing to be doing than reviewing patches on a Saturday
evening. Looks good though I might suggest moving the indent of the
comment in the new if statement.
Reviewed-by: Chad Dupuis <cdupu...@gmail.com>
