[dpdk-stable] [PATCH 20.11] net/i40evf: extend the polling times of vf reset

[Xueming(Steven) Li]

On Thu, 2021-09-09 at 17:13 +0800, Qiming Chen wrote:
> In the embedded RTOS environment, the x722 controller Ethernet card of
> the d2146nt chip, the vfio user mode driver takes over 8 vf ports in
> turn, but i40evf_check_vf_reset_done will probably fail.
> 
> The version matching is no problem, and there is no
> substantial progress. Learning from the implementation
> of the i40evf kernel driver locally, after modifying the polling time
> from 1 second to 5s, the repeated restart process took over the start
> port test, and it was found that this probability was reduced to an
> order of magnitude acceptable to the user.
> 
> The patch cannot fundamentally solve the failure problem, but it greatly
> slows down the probability of the problem. The modification is based on the
> i40evf kernel driver.
> 
> Fixes: 4861cde46116 ("i40e: new poll mode driver")
> 
> Signed-off-by: Qiming Chen <chenqiming_huawei at 163.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 f64db72e9a..924da8dfb4 100644
> --- a/drivers/net/i40e/i40e_ethdev_vf.c
> +++ b/drivers/net/i40e/i40e_ethdev_vf.c
> @@ -42,7 +42,7 @@
>  /* busy wait delay in msec */
>  #define I40EVF_BUSY_WAIT_DELAY 10
>  #define I40EVF_BUSY_WAIT_COUNT 50
> -#define MAX_RESET_WAIT_CNT     20
> +#define MAX_RESET_WAIT_CNT     100
>  
>  #define I40EVF_ALARM_INTERVAL 50000 /* us */
>  

Hi Qiming,

This is v2 patch, add "-v 2" in format-patch command, "[v2]" will
appear in subject. Also add v1 mail Message-Id to reply in send-email
command to make v2 patch in the tree of v1. Message-Id can be found in
either your email client or http://inbox.dpdk.org/stable/.

Applied to 20.11.4, thanks!

Regards,
Xueming