netdev - Re: [PATCH bpf-next 2/2] bpf: Add loop test case with 32 bit reg comparison against 0

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Message-ID: <CAPhsuW6oGoBK28JyY3r6a+fzesqa8c7Zki+z33XXV2AS6=JVwQ@mail.gmail.com>
Date:   Thu, 3 Oct 2019 13:56:53 -0700
From:   Song Liu <liu.song.a23@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Alexei Starovoitov <ast@...nel.org>, bpf <bpf@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>
Subject: Re: [PATCH bpf-next 2/2] bpf: Add loop test case with 32 bit reg
 comparison against 0

On Wed, Oct 2, 2019 at 5:30 PM Daniel Borkmann <daniel@...earbox.net> wrote:
>
> Add a loop test with 32 bit register against 0 immediate:
>
>   # ./test_verifier 631
>   #631/p taken loop with back jump to 1st insn, 2 OK
>
> Disassembly:
>
>   [...]
>   1b:   test   %edi,%edi
>   1d:   jne    0x0000000000000014
>   [...]
>
> Pretty much similar to prior "taken loop with back jump to 1st
> insn" test case just as jmp32 variant.
>
> Signed-off-by: Daniel Borkmann <daniel@...earbox.net>

Acked-by: Song Liu <songliubraving@...com>