netdev - Re: [RFC bpf-next 5/7] bpf: when doing BPF_PROG_TEST

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Date:   Tue, 5 Feb 2019 15:19:52 -0500
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Stanislav Fomichev <sdf@...gle.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        simon.horman@...ronome.com, Willem de Bruijn <willemb@...gle.com>
Subject: Re: [RFC bpf-next 5/7] bpf: when doing BPF_PROG_TEST_RUN for flow
 dissector use no-skb mode

On Tue, Feb 5, 2019 at 12:58 PM Stanislav Fomichev <sdf@...gle.com> wrote:
>
> Now that we have __flow_bpf_dissect which works on raw data (by
> constructing temporary on-stack skb), use it when doing
> BPF_PROG_TEST_RUN for flow dissector.
>
> This should help us catch any possible bugs due to missing shinfo on
> the on-stack skb.
>
> Note that existing __skb_flow_bpf_dissect swallows L2 headers and returns
> nhoff=0, we need to preserve the existing behavior.
>
> Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
> ---
>  net/bpf/test_run.c | 52 +++++++++++++++-------------------------------
>  1 file changed, 17 insertions(+), 35 deletions(-)
>

>         ret = bpf_test_finish(kattr, uattr, &flow_keys, sizeof(flow_keys),
>                               retval, duration);
> -
> -       kfree_skb(skb);
> -       kfree(sk);
> +       kfree(data);
>         return ret;
> +

nit: unnecessary whitespace line

>  }