Re: [dpdk-dev] [PATCH v2] net/i40e: extend VF reset waiting time

[Ferruh Yigit <ferruh.yigit@intel.com>]

On 4/25/2021 3:02 AM, Wenjun Wu wrote:
> When resetting VF, VF will issue reset command to PF, wait a
> fixed amount of time, and assume VF reset is done. However,
> due to the change of dpdk related library content, the original
> delay is not enough. When we use DPDK PF instead of kernel PF,
> it may cause VF start error.
> 

Hi Wenjun,

Can you please give details of the "the change of dpdk related library content"?
This can help to document the root cause of the problem.
And you can also add fixes tag for that change if it is appropriate.


> This patch extend VF reset waiting time from 200ms to 500ms so that
> VF can start normally when using DPDK PF and DPDK VF in most cases.
> 
> Signed-off-by: Wenjun Wu <wenjun1.wu@intel.com>
> ---
>  drivers/net/i40e/i40e_ethdev_vf.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
> index 3c258ba7cf..aeb6816b9f 100644
> --- a/drivers/net/i40e/i40e_ethdev_vf.c
> +++ b/drivers/net/i40e/i40e_ethdev_vf.c
> @@ -1236,7 +1236,7 @@ i40evf_reset_vf(struct rte_eth_dev *dev)
>  	  * it to ACTIVE. In this duration, vf may not catch the moment that
>  	  * COMPLETE is set. So, for vf, we'll try to wait a long time.
>  	  */
> -	rte_delay_ms(200);
> +	rte_delay_ms(500);
>  
>  	ret = i40evf_check_vf_reset_done(dev);
>  	if (ret) {
>