netdev - Re: [PATCH bpf] bpf: fix XDP FD-based attach/detach logic around XDP_FLAGS_UPDATE_IF

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Message-ID: <CAADnVQLNi=r+H0+kc3BmN8GtRK-3f2h0+ssHSbSMMeh3Dsc_Kg@mail.gmail.com>
Date:   Wed, 12 Aug 2020 18:08:56 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Stanislav Fomichev <sdf@...gle.com>
Cc:     Toke Høiland-Jørgensen <toke@...hat.com>,
        Andrii Nakryiko <andriin@...com>, bpf <bpf@...r.kernel.org>,
        Netdev <netdev@...r.kernel.org>, Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH bpf] bpf: fix XDP FD-based attach/detach logic around XDP_FLAGS_UPDATE_IF_NOEXIST

On Wed, Aug 12, 2020 at 8:48 AM Stanislav Fomichev <sdf@...gle.com> wrote:
>
> On Wed, Aug 12, 2020 at 2:24 AM Toke Høiland-Jørgensen <toke@...hat.com> wrote:
> >
> > Andrii Nakryiko <andriin@...com> writes:
> >
> > > Enforce XDP_FLAGS_UPDATE_IF_NOEXIST only if new BPF program to be attached is
> > > non-NULL (i.e., we are not detaching a BPF program).
> > >
> > > Reported-by: Stanislav Fomichev <sdf@...gle.com>
> > > Fixes: d4baa9368a5e ("bpf, xdp: Extract common XDP program attachment logic")
> > > Signed-off-by: Andrii Nakryiko <andriin@...com>
> >
> > Acked-by: Toke Høiland-Jørgensen <toke@...hat.com>
> That fixed it for me, thank you!
>
> Tested-by: Stanislav Fomichev <sdf@...gle.com>

Applied. Thanks