[dpdk-stable] [PATCH 20.11] net/i40e: extend the polling times of vf reset

[Xueming(Steven) Li]

On Wed, 2021-09-08 at 03:15 +0000, Xing, Beilei wrote:
> 
> > -----Original Message-----
> > From: Qiming Chen <chenqiming_huawei at 163.com>
> > Sent: Monday, September 6, 2021 3:14 PM
> > To: stable at dpdk.org
> > Cc: Xing, Beilei <beilei.xing at intel.com>; Qiming Chen
> > <chenqiming_huawei at 163.com>
> > Subject: [PATCH 20.11] net/i40e: extend the polling times of vf reset
> > 
> > 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.
> > 
> > This issue has been discussed with intel&dpdk experts for 3 rounds before,
> > and the version matching is no problem, and there is no substantial progress.
> > The official website contacted external experts, but there was no response
> > afterwards. 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.
> 
> This detail segment of communication between PAEs can be removed.
> 
> > 
> > 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: 5c9222058df7 ("i40e: move to drivers/net/")
> 
> I think the fix commit id is 4861cde4611601ccc9d467675f9d7a10c3095b54 (i40e: new poll mode driver)
> 
> 
> > Cc: stable at dpdk.org
> > 
> > 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 */
> > 
> > --
> > 2.30.1.windows.1
> 

Same for this patch, please update and send v2, thanks!