RE: [PATCH v3] net/i40e: fix max frame size config at port level

["Zhang, Yuying" <yuying.zhang@intel.com>]

Hi Wenxuan,

> -----Original Message-----
> From: Wu, WenxuanX <wenxuanx.wu@intel.com>
> Sent: Friday, May 13, 2022 3:21 PM
> To: Xing, Beilei <beilei.xing@intel.com>; Zhang, Yuying
> <yuying.zhang@intel.com>; dev@dpdk.org
> Cc: Wu, WenxuanX <wenxuanx.wu@intel.com>; Zhou, YidingX
> <yidingx.zhou@intel.com>; stable@dpdk.org
> Subject: [PATCH v3] net/i40e: fix max frame size config at port level
> 
> From: Wenxuan Wu <wenxuanx.wu@intel.com>
> 
> Previously, max frame size can only be set when link is up, and the wait time
> is 1 sec. Startup time of 10G_BASET longer than 1s would result in failure.
> 
> Acctually, max frame size of media type I40E_MEDIA_TYPE_BASET can be set
> regardless of link status.
> 
> This patch omitted the link status check of 10G_MEDIA_TYPE_BASET.
> 
> Fixes: a4ba77367923 ("net/i40e: enable maximum frame size at port level")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Wenxuan Wu <wenxuanx.wu@intel.com>
> ---
>  drivers/net/i40e/i40e_ethdev.c | 24 ++++++++++++++----------
>  1 file changed, 14 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
> index 755786dc10..12d3cd9b0c 100644
> --- a/drivers/net/i40e/i40e_ethdev.c
> +++ b/drivers/net/i40e/i40e_ethdev.c
> @@ -12102,17 +12102,21 @@ i40e_set_mac_max_frame(struct rte_eth_dev
> *dev, uint16_t size)
>  	struct i40e_hw *hw = I40E_DEV_PRIVATE_TO_HW(dev->data-
> >dev_private);
>  	uint32_t rep_cnt = MAX_REPEAT_TIME;
>  	struct rte_eth_link link;
> -	enum i40e_status_code status;
> -
> -	do {
> -		update_link_reg(hw, &link);
> -		if (link.link_status)
> -			break;
> -
> -		rte_delay_ms(CHECK_INTERVAL);
> -	} while (--rep_cnt);
> +	enum i40e_status_code status = I40E_ERR_DEVICE_NOT_SUPPORTED;

There is no need to initialize status. You can reserve the original code.

> +	bool can_be_set = true;
> +
> +	/* I40E_MEDIA_TYPE_BASET link up can be ignored */
> +	if (hw->phy.media_type != I40E_MEDIA_TYPE_BASET) {
> +		do {
> +			update_link_reg(hw, &link);
> +			if (link.link_status)
> +				break;
> +			rte_delay_ms(CHECK_INTERVAL);
> +		} while (--rep_cnt);
> +		can_be_set = link.link_status != 0;

can_be_set = !(! link.link_status);

> +	}
> 
> -	if (link.link_status) {
> +	if (can_be_set) {
>  		status = i40e_aq_set_mac_config(hw, size, TRUE, 0, false,
> NULL);
>  		if (status != I40E_SUCCESS)
>  			PMD_DRV_LOG(ERR, "Failed to set max frame size at
> port level");
> --
> 2.25.1