netdev - Re: [bpf-next, v2] samples: bpf: add max_pckt_size option at xdp_adjust

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Message-ID: <CAPhsuW6dnbwtCxf5AO6gJe07qu4ewvO1NQ+ZiQVBR8jUVfQ9uQ@mail.gmail.com>
Date:   Thu, 29 Aug 2019 13:41:54 -0700
From:   Song Liu <liu.song.a23@...il.com>
To:     "Daniel T. Lee" <danieltimlee@...il.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Networking <netdev@...r.kernel.org>
Subject: Re: [bpf-next, v2] samples: bpf: add max_pckt_size option at xdp_adjust_tail

On Mon, Aug 26, 2019 at 9:52 AM Daniel T. Lee <danieltimlee@...il.com> wrote:
>
> Currently, at xdp_adjust_tail_kern.c, MAX_PCKT_SIZE is limited
> to 600. To make this size flexible, a new map 'pcktsz' is added.
>
> By updating new packet size to this map from the userland,
> xdp_adjust_tail_kern.o will use this value as a new max_pckt_size.
>
> If no '-P <MAX_PCKT_SIZE>' option is used, the size of maximum packet
> will be 600 as a default.

Please also cc bpf@...r.kernel.org for bpf patches.

>
> Signed-off-by: Daniel T. Lee <danieltimlee@...il.com>

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

With a nit below.

[...]

> diff --git a/samples/bpf/xdp_adjust_tail_user.c b/samples/bpf/xdp_adjust_tail_user.c
> index a3596b617c4c..29ade7caf841 100644
> --- a/samples/bpf/xdp_adjust_tail_user.c
> +++ b/samples/bpf/xdp_adjust_tail_user.c
> @@ -72,6 +72,7 @@ static void usage(const char *cmd)
>         printf("Usage: %s [...]\n", cmd);
>         printf("    -i <ifname|ifindex> Interface\n");
>         printf("    -T <stop-after-X-seconds> Default: 0 (forever)\n");
> +       printf("    -P <MAX_PCKT_SIZE> Default: 600\n");

nit: printf("    -P <MAX_PCKT_SIZE> Default: %u\n", MAX_PCKT_SIZE);