RE: [PATCH v2] net/i40e: don't check link status on device start

["Su, Simei" <simei.su@intel.com>]

Hi Thomas,

> -----Original Message-----
> From: Thomas Monjalon <thomas@monjalon.net>
> Sent: Tuesday, February 7, 2023 7:32 PM
> To: Zhang, Helin <helin.zhang@intel.com>; Su, Simei <simei.su@intel.com>
> Cc: David Marchand <david.marchand@redhat.com>; dev@dpdk.org; Zhang,
> Yuying <yuying.zhang@intel.com>; Xing, Beilei <beilei.xing@intel.com>;
> Mcnamara, John <john.mcnamara@intel.com>; stable@dpdk.org; Zhang, Qi Z
> <qi.z.zhang@intel.com>; Dapeng Yu <dapengx.yu@intel.com>; Wenxuan Wu
> <wenxuanx.wu@intel.com>
> Subject: Re: [PATCH v2] net/i40e: don't check link status on device start
> 
> 16/01/2023 12:02, Su, Simei:
> > From: David Marchand <david.marchand@redhat.com>
> > > On Fri, Jan 13, 2023 at 2:51 PM Zhang, Helin <helin.zhang@intel.com>
> wrote:
> > > > From: David Marchand <david.marchand@redhat.com>
> > > > > On Fri, Jan 13, 2023 at 2:39 PM Zhang, Helin
> > > > > <helin.zhang@intel.com>
> > > > > > From: David Marchand <david.marchand@redhat.com>
> > > > > > > Hello i40e maintainers, John,
> > > > > > >
> > > > > > > On Mon, Jan 9, 2023 at 10:21 AM David Marchand
> > > > > > > <david.marchand@redhat.com> wrote:
> > > > > > > > On Tue, Jan 3, 2023 at 3:02 PM David Marchand
> > > > > > > <david.marchand@redhat.com> wrote:
> > > > > > > > > Hi i40e maintainers,
> > > > > > > > >
> > > > > > > > > On Tue, Dec 13, 2022 at 10:19 AM David Marchand
> > > > > > > > > <david.marchand@redhat.com> wrote:
> > > > > > > > > >
> > > > > > > > > > The mentioned changes broke existing applications when
> > > > > > > > > > the link status of i40e ports is down at the time the port is
> started.
> > > > > > > > > > Revert those changes, the original issue will need a different
> fix.
> > > > > > Hi David
> > > > > >
> > > > > > Does it break all the application or just a specific application?
> > > > >
> > > > > I don't see how it would not affect all applications seeing how
> > > > > the original patch is dumb.
> > > > >
> > > > > > We may need to understand the issue you met, and try to fix it later.
> > > > >
> > > > > Just unplug the cable or fake a link down on your i40e port,
> > > > > start your application or port, then plug the cable back.
> > > > > The max frame size will never get applied to hw.
> > > >
> > > > Got it, I will forward to a right expert to check. Thank you very
> > > > much for
> > > reaching out to us!
> > >
> > > I hope I get a reply _soon_.
> > > Or I will just apply those reverts.
> >
> > If applying those reverts, some issues still exist on our side. I sent one patch
> to patchwork:
> >
> https://patchwork.dpdk.org/project/dpdk/patch/20230116105318.19412-1-si
> mei.su@intel.com/.
> > You can try this patch to see whether it can solve the issue on your side.
> > At the same time, on our side, we need to do regression test further
> > to check if this patch will affect other cases, the regression takes some time.
> >
> > Thanks,
> > Simei
> 
> Simei, do you have any update in this thread?
> Last reply was 3 weeks ago. I hope regression test don't take so much time.
> 
> 
The latest patch for this issue is https://patchwork.dpdk.org/project/dpdk/patch/20230202123632.56730-1-simei.su@intel.com/ which needs to be reworked further.

Thanks,
Simei