Re: [dpdk-dev] [PATCH] net/iavf: fix PF returning error

["Xing, Beilei" <beilei.xing@intel.com>]

> -----Original Message-----
> From: Zhang, AlvinX <alvinx.zhang@intel.com>
> Sent: Sunday, April 25, 2021 1:05 PM
> To: Wu, Jingjing <jingjing.wu@intel.com>; Xing, Beilei <beilei.xing@intel.com>
> Cc: dev@dpdk.org; Zhang, AlvinX <alvinx.zhang@intel.com>; stable@dpdk.org
> Subject: [PATCH] net/iavf: fix PF returning error
> 
> When the command sent by VF to PF fails, iavf may need to run different code
> paths according to the specific reason of the failure (not supported or other
> reasons).
> 
> This patch adds support of identifying PF return error type.
> 
> Fixes: 22b123a36d07 ("net/avf: initialize PMD")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Alvin Zhang <alvinx.zhang@intel.com>
> ---
>  drivers/net/iavf/iavf_vchnl.c | 18 ++++++++++++------
>  1 file changed, 12 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/iavf/iavf_vchnl.c b/drivers/net/iavf/iavf_vchnl.c index
> 45096cb..6586fc3 100644
> --- a/drivers/net/iavf/iavf_vchnl.c
> +++ b/drivers/net/iavf/iavf_vchnl.c
> @@ -228,13 +228,19 @@
>  			rte_delay_ms(ASQ_DELAY_MS);
>  			/* If don't read msg or read sys event, continue */
>  		} while (i++ < MAX_TRY_TIMES);
> -		/* If there's no response is received, clear command */
> -		if (i >= MAX_TRY_TIMES  ||
> -		    vf->cmd_retval != VIRTCHNL_STATUS_SUCCESS) {
> -			err = -1;
> -			PMD_DRV_LOG(ERR, "No response or return failure
> (%d)"
> -				    " for cmd %d", vf->cmd_retval, args->ops);
> +
> +		if (i >= MAX_TRY_TIMES) {
> +			PMD_DRV_LOG(ERR, "No response for cmd %d", args-
> >ops);
>  			_clear_cmd(vf);
> +			err = -EIO;
> +		} else if (vf->cmd_retval ==
> +			   (uint32_t)VIRTCHNL_STATUS_ERR_NOT_SUPPORTED)

Can we change 'uint32_t cmd_retval' to 'enum virtchnl_status_code cmd_retval' in iavf_info structure? Then we needn't cast here.

> {
> +			PMD_DRV_LOG(ERR, "Cmd %d not supported", args-
> >ops);
> +			err = -ENOTSUP;
> +		} else if (vf->cmd_retval != VIRTCHNL_STATUS_SUCCESS) {
> +			PMD_DRV_LOG(ERR, "Return failure %d for cmd %d",
> +				    vf->cmd_retval, args->ops);
> +			err = -EINVAL;
>  		}
>  		break;
>  	}
> --
> 1.8.3.1