linux-kernel - Re: [PATCH 4/4] qla2xxx: Handle incorrect entry

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Date:   Thu, 27 Aug 2020 12:17:13 +0200
From:   Martin Wilck <mwilck@...e.com>
To:     Daniel Wagner <dwagner@...e.de>, linux-scsi@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Nilesh Javali <njavali@...vell.com>
Subject: Re: [PATCH 4/4] qla2xxx: Handle incorrect entry_type entries

On Thu, 2020-08-27 at 11:58 +0200, Daniel Wagner wrote:
> It was observed on an ISP8324 16Gb HBA with fw=8.08.203 (d0d5) that
> pkt->entry_type was MBX_IOCB_TYPE/0x39 with an sp->type SRB_SCSI_CMD
> which is invalid and should not be possible.
> 
> A careful code review of the crash dump didn't reveal any short
> comings. Reading the entry_type from the crash dump shows the
> expected
> value of STATUS_TYPE/0x03 but the call trace shows that
> qla24xx_mbx_iocb_entry() is used.
> 
> One possible explanation is when pkt->entry_type is read it doesn't
> contain the correct information. That means the driver observes an
> data
> race by the firmware.
> 
> Signed-off-by: Daniel Wagner <dwagner@...e.de>
> ---
>  drivers/scsi/qla2xxx/qla_isr.c | 28 ++++++++++++++++++++++++++--
>  1 file changed, 26 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/scsi/qla2xxx/qla_isr.c
> b/drivers/scsi/qla2xxx/qla_isr.c
> index b787643f5031..0c324e88b189 100644
> --- a/drivers/scsi/qla2xxx/qla_isr.c
> +++ b/drivers/scsi/qla2xxx/qla_isr.c
> @@ -3392,6 +3392,31 @@ void qla24xx_nvme_ls4_iocb(struct
> scsi_qla_host *vha,
>  	sp->done(sp, comp_status);
>  }
>  
> +static void qla24xx_process_mbx_iocb_response(struct scsi_qla_host
> *vha,
> +	struct rsp_que *rsp, struct sts_entry_24xx *pkt)
> +{
> +	srb_t *sp;
> +
> +	sp = qla2x00_get_sp_from_handle(vha, rsp->req, pkt);
> +	if (!sp)
> +		return;
> +
> +	if (sp->type == SRB_SCSI_CMD ||
> +	    sp->type == SRB_NVME_CMD ||
> +	    sp->type == SRB_TM_CMD) {
> +		/* Some firmware version don't update the entry_type
> +		 * correctly.  It was observed entry_type contained
> +		 * MBCX_IOCB_TYPE instead of the expected STATUS_TYPE
> +		 * for sp->type SRB_SCSI_CMD, SRB_NVME_CMD or
> +		 * SRB_TM_CMD.
> +		 */
> +		qla2x00_status_entry(vha, rsp, pkt);
> +		return;
> +	}
> +
> +	qla24xx_mbx_iocb_entry(vha, rsp->req, (struct mbx_24xx_entry
> *)pkt);
> +}
> +
>  /**
>   * qla24xx_process_response_queue() - Process response queue
> entries.
>   * @vha: SCSI driver HA context
> @@ -3499,8 +3524,7 @@ void qla24xx_process_response_queue(struct
> scsi_qla_host *vha,
>  			    (struct abort_entry_24xx *)pkt);
>  			break;
>  		case MBX_IOCB_TYPE:
> -			qla24xx_mbx_iocb_entry(vha, rsp->req,
> -			    (struct mbx_24xx_entry *)pkt);
> +			qla24xx_process_mbx_iocb_response(vha, rsp,
> pkt);
>  			break;
>  		case VP_CTRL_IOCB_TYPE:
>  			qla_ctrlvp_completed(vha, rsp->req,

Should we perhaps log an error message when we detect a mismatch
between sp->type and entry_type?

Regards,
Martin