netdev - Re: [RFC PATCH 1/2] bpf: do not WARN in bpf_warn_invalid_xdp

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Date:   Mon, 15 Nov 2021 17:20:38 +0100
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, bpf@...r.kernel.org
Subject: Re: [RFC PATCH 1/2] bpf: do not WARN in bpf_warn_invalid_xdp_action()

Paolo Abeni <pabeni@...hat.com> writes:

> The WARN_ONCE() in bpf_warn_invalid_xdp_action() can be triggered by
> any bugged program, and even attaching a correct program to a NIC
> not supporting the given action.
>
> The resulting splat, beyond polluting the logs, fouls automated tools:
> e.g. a syzkaller reproducers using an XDP program returning an
> unsupported action will never pass validation.
>
> Replace the WARN_ONCE with a less intrusive pr_warn_once().
>
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>

Acked-by: Toke Høiland-Jørgensen <toke@...hat.com>