Re: [dpdk-dev] [PATCH] net/i40e: select fdir config automatically

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

> -----Original Message-----
> From: Li, Xiaoyun
> Sent: Friday, September 28, 2018 3:25 PM
> To: Yigit, Ferruh <ferruh.yigit@intel.com>; Zhang, Qi Z
> <qi.z.zhang@intel.com>; Xing, Beilei <beilei.xing@intel.com>; dev@dpdk.org
> Cc: Li, Xiaoyun <xiaoyun.li@intel.com>
> Subject: [PATCH] net/i40e: select fdir config automatically
> 
> I40e driver needed users to config exact fdir mode to create rte_flow rules
> but it shouldn't. This patch allows users to create rte_flow rules without
> configuring fdir mode and let the driver select the config automatically.
> 
> Signed-off-by: Xiaoyun Li <xiaoyun.li@intel.com>
> ---
>  drivers/net/i40e/i40e_flow.c | 33 ++++++++++++++++++++++++++++-----
>  1 file changed, 28 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/i40e/i40e_flow.c b/drivers/net/i40e/i40e_flow.c index
> c67b264de..70ff33ac0 100644
> --- a/drivers/net/i40e/i40e_flow.c
> +++ b/drivers/net/i40e/i40e_flow.c
> @@ -3127,6 +3127,7 @@ i40e_flow_parse_fdir_filter(struct rte_eth_dev
> *dev,
>  			    struct rte_flow_error *error,
>  			    union i40e_filter_t *filter)
>  {
> +	struct i40e_pf *pf = I40E_DEV_PRIVATE_TO_PF(dev->data-
> >dev_private);
>  	struct i40e_fdir_filter_conf *fdir_filter =
>  		&filter->fdir_filter;
>  	int ret;
> @@ -3148,14 +3149,29 @@ i40e_flow_parse_fdir_filter(struct rte_eth_dev
> *dev,
> 
>  	if (dev->data->dev_conf.fdir_conf.mode !=
>  	    RTE_FDIR_MODE_PERFECT) {
> -		rte_flow_error_set(error, ENOTSUP,
> -				   RTE_FLOW_ERROR_TYPE_UNSPECIFIED,
> -				   NULL,
> -				   "Check the mode in fdir_conf.");
> -		return -rte_errno;
> +		/* Enable fdir when fdir flow is added at first time. */
> +		ret = i40e_fdir_setup(pf);
> +		if (ret != I40E_SUCCESS) {
> +			rte_flow_error_set(error, ENOTSUP,
> +					   RTE_FLOW_ERROR_TYPE_HANDLE,
> +					   NULL, "Failed to setup fdir.");
> +			return -rte_errno;
> +		}
> +		ret = i40e_fdir_configure(dev);
> +		if (ret < 0) {
> +			rte_flow_error_set(error, ENOTSUP,
> +					   RTE_FLOW_ERROR_TYPE_HANDLE,
> +					   NULL, "Failed to configure fdir.");
> +			goto err;
> +		}
> +
> +		dev->data->dev_conf.fdir_conf.mode =
> RTE_FDIR_MODE_PERFECT;
>  	}
> 
>  	return 0;
> +err:
> +	i40e_fdir_teardown(pf);
> +	return -rte_errno;
>  }
> 
>  /* Parse to get the action info of a tunnel filter @@ -4708,6 +4724,13 @@
> i40e_flow_destroy(struct rte_eth_dev *dev,
>  	case RTE_ETH_FILTER_FDIR:
>  		ret = i40e_flow_add_del_fdir_filter(dev,
>  		       &((struct i40e_fdir_filter *)flow->rule)->fdir, 0);
> +
> +		/* If the last flow is destroyed, disable fdir. */
> +		if (!ret && !TAILQ_FIRST(&pf->fdir.fdir_list)) {

How about TAILQ_EMPTY which is more intuitive? 

> +			i40e_fdir_teardown(pf);
> +			dev->data->dev_conf.fdir_conf.mode =
> +				   RTE_FDIR_MODE_NONE;
> +		}

Do you consider FDIR teardown after FDIR flush?

>  		break;
>  	case RTE_ETH_FILTER_HASH:
>  		ret = i40e_config_rss_filter_del(dev,
> --
> 2.17.1