linux-kernel - Re: [PATCH 4/6] hisi_sas: use slot abort in v2 hw

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Date:	Tue, 16 Feb 2016 16:32:33 +0100
From:	Hannes Reinecke <hare@...e.de>
To:	John Garry <john.garry@...wei.com>, JBottomley@...n.com,
	martin.petersen@...cle.com
Cc:	linuxarm@...wei.com, zhangfei.gao@...aro.org, xuwei5@...ilicon.com,
	john.garry2@...l.dcu.ie, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] hisi_sas: use slot abort in v2 hw

On 02/16/2016 01:22 PM, John Garry wrote:
> When TRANS_TX_ERR_FRAME_TXED error occurs for
> a command, the command should be re-attempted.
> 
> Signed-off-by: John Garry <john.garry@...wei.com>
> ---
>  drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 19 +++++++++++++++++--
>  1 file changed, 17 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
> index 58e1956..2bf93079b 100644
> --- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
> +++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
> @@ -1190,7 +1190,8 @@ static void sata_done_v2_hw(struct hisi_hba *hisi_hba, struct sas_task *task,
>  /* by default, task resp is complete */
>  static void slot_err_v2_hw(struct hisi_hba *hisi_hba,
>  			   struct sas_task *task,
> -			   struct hisi_sas_slot *slot)
> +			   struct hisi_sas_slot *slot,
> +			   int *abort_slot)
>  {
>  	struct task_status_struct *ts = &task->task_status;
>  	struct hisi_sas_err_record_v2 *err_record = slot->status_buffer;
> @@ -1299,6 +1300,13 @@ static void slot_err_v2_hw(struct hisi_hba *hisi_hba,
>  			ts->stat = SAS_DATA_UNDERRUN;
>  			break;
>  		}
> +		case TRANS_TX_ERR_FRAME_TXED:
> +		{
> +			/* This will request a retry */
> +			ts->stat = SAS_QUEUE_FULL;
> +			++(*abort_slot);
> +			break;
> +		}
>  		case TRANS_TX_OPEN_FAIL_WITH_IT_NEXUS_LOSS:
>  		case TRANS_TX_ERR_PHY_NOT_ENABLE:
>  		case TRANS_TX_OPEN_CNX_ERR_BY_OTHER:
> @@ -1491,11 +1499,17 @@ slot_complete_v2_hw(struct hisi_hba *hisi_hba, struct hisi_sas_slot *slot,
>  
>  	if ((complete_hdr->dw0 & CMPLT_HDR_ERX_MSK) &&
>  		(!(complete_hdr->dw0 & CMPLT_HDR_RSPNS_XFRD_MSK))) {
> +		int abort_slot = 0;
>  		dev_dbg(dev, "%s slot %d has error info 0x%x\n",
>  			__func__, slot->cmplt_queue_slot,
>  			complete_hdr->dw0 & CMPLT_HDR_ERX_MSK);
>  
> -		slot_err_v2_hw(hisi_hba, task, slot);
> +		slot_err_v2_hw(hisi_hba, task, slot, &abort_slot);
> +		if (unlikely(abort_slot)) {
> +			queue_work(hisi_hba->wq, &slot->abort_slot);
> +			sts = ts->stat;
> +			goto out_1;
> +		}
>  		goto out;
>  	}
>  
Again this weird 'abort_slot' pointer reshuffling.
Care to clarify?

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		   Teamlead Storage & Networking
hare@...e.de			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
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