netdev - Re: ❌ FAIL: Test report for kernel 5.10.0-rc6 (mainline.kernel.org)

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Date:   Wed, 9 Dec 2020 22:07:54 +0100
From:   Eric Dumazet <edumazet@...gle.com>
To:     Vlad Buslov <vladbu@...dia.com>
Cc:     Saeed Mahameed <saeed@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Jianlin Shi <jishi@...hat.com>,
        CKI Project <cki-project@...hat.com>,
        netdev <netdev@...r.kernel.org>, skt-results-master@...hat.com,
        Yi Zhang <yi.zhang@...hat.com>,
        Memory Management <mm-qe@...hat.com>,
        Jan Stancek <jstancek@...hat.com>,
        Jianwen Ji <jiji@...hat.com>, Hangbin Liu <haliu@...hat.com>,
        Ondrej Moris <omoris@...hat.com>,
        Ondrej Mosnacek <omosnace@...hat.com>,
        Changhui Zhong <czhong@...hat.com>,
        Xiong Zhou <xzhou@...hat.com>,
        Rachel Sibley <rasibley@...hat.com>,
        David Arcari <darcari@...hat.com>
Subject: Re: ❌ FAIL: Test report for kernel 5.10.0-rc6 (mainline.kernel.org)

On Wed, Dec 9, 2020 at 9:54 PM Vlad Buslov <vladbu@...dia.com> wrote:
>
> On Wed 09 Dec 2020 at 20:50, Eric Dumazet <edumazet@...gle.com> wrote:
> > On Wed, Dec 9, 2020 at 7:34 PM Saeed Mahameed <saeed@...nel.org> wrote:
> >>
> >> On Wed, 2020-12-09 at 19:05 +0100, Eric Dumazet wrote:
> >> > On Wed, Dec 9, 2020 at 6:35 PM Eric Dumazet <edumazet@...gle.com>
> >> > wrote:
> >> > > Hmm... maybe the ECN stuff has always been buggy then, and nobody
> >> > > cared...
> >> > >
> >> >
> >> > Wait a minute, maybe this part was not needed,
> >> >
> >> > diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
> >> > index
> >> > 8ae9ce2014a4a3ba7b962a209e28d1f65d4a83bd..896a7eb61d70340f69b9d3be0f7
> >> > 95fbaab1458dd
> >> > 100644
> >> > --- a/drivers/net/geneve.c
> >> > +++ b/drivers/net/geneve.c
> >> > @@ -270,7 +270,7 @@ static void geneve_rx(struct geneve_dev *geneve,
> >> > struct geneve_sock *gs,
> >> >                         goto rx_error;
> >> >                 break;
> >> >         default:
> >> > -               goto rx_error;
> >> > +               break;
> >> >         }
> >> >         oiph = skb_network_header(skb);
> >> >         skb_reset_network_header(skb);
> >> >
> >> >
> >> > > On Wed, Dec 9, 2020 at 6:20 PM Jakub Kicinski <kuba@...nel.org>
> >> > > wrote:
> >> > > > Eric, could this possibly be commit 4179b00c04d1 ("geneve: pull
> >> > > > IP
> >> > > > header before ECN decapsulation")?
> >> > > >
> >>
> >> We've bisected an issue in our CI to this patch, something about geneve
> >> TC offload traffic not passing, I don't have all the details, Maybe
> >> Vlad can chime in.
> >>
> >
> > Yes, I think the patch I sent should fix this, ETH_P_ARP should not be
> > dropped ;)
> >
> > I am testing this before offical patch submission.
> >
> > Thanks !
>
> Hi Eric,
>
> Your patch fixed TC geneve tests for me, but some of more complex OVS
> tests are still failing. I'll try to provide details tomorrow.
>
> Regards,
> Vlad
>

I think I need to study a bit more the original syzbot report.

Apparently, network header should have been pulled already before
hitting geneve_rx()

Jakub, please revert my patch, I need to fix the syzbot issue differently.

Thanks !