netdev - Re: [PATCH] bpf: Allow bpf_skb_event

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Date:   Mon, 24 Jun 2019 16:12:36 -0700
From:   Song Liu <liu.song.a23@...il.com>
To:     allanzhang <allanzhang@...gle.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        "David S. Miller" <davem@...emloft.net>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] bpf: Allow bpf_skb_event_output for a few prog types

On Mon, Jun 24, 2019 at 4:10 PM Song Liu <liu.song.a23@...il.com> wrote:
>
> On Mon, Jun 24, 2019 at 3:08 PM allanzhang <allanzhang@...gle.com> wrote:
> >
> > Software event output is only enabled by a few prog types right now (TC,
> > LWT out, XDP, sockops). Many other skb based prog types need
> > bpf_skb_event_output to produce software event.
> >
> > Added socket_filter, cg_skb, sk_skb prog types to generate sw event.
> >
> > Test bpf code is generated from code snippet:
> >
> > struct TMP {
> >     uint64_t tmp;
> > } tt;
> > tt.tmp = 5;
> > bpf_perf_event_output(skb, &connection_tracking_event_map, 0,
> >                       &tt, sizeof(tt));
> > return 1;
> >
> > the bpf assembly from llvm is:
> >        0:       b7 02 00 00 05 00 00 00         r2 = 5
> >        1:       7b 2a f8 ff 00 00 00 00         *(u64 *)(r10 - 8) = r2
> >        2:       bf a4 00 00 00 00 00 00         r4 = r10
> >        3:       07 04 00 00 f8 ff ff ff         r4 += -8
> >        4:       18 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00    r2 = 0ll
> >        6:       b7 03 00 00 00 00 00 00         r3 = 0
> >        7:       b7 05 00 00 08 00 00 00         r5 = 8
> >        8:       85 00 00 00 19 00 00 00         call 25
> >        9:       b7 00 00 00 01 00 00 00         r0 = 1
> >       10:       95 00 00 00 00 00 00 00         exit
> >
> > Patch 1 is enabling code.
> > Patch 2 is fullly covered selftest code.
> >
> > Signed-off-by: allanzhang <allanzhang@...gle.com>
>
> A few logistics issues:
>
> 1. The patch should be sent as a set, as
>    [PATCH bpf-next 0/2] ...
>    [PATCH bpf-next 1/2] ...
>    [PATCH bpf-next 2/2] ...
>
> 2. You need to specify which tree this is targeting. In this case, bpf-next.
> 3. Please use different commit log for each patch.
> 4. No need for Signed-off-by in the cover letter.
>
> Please resubmit. And generate the patches with git command similar to
> the following:
>
> git format-patch --cover-leter --subject_prefix "PATCH bpf-next v2" HEAD~2
>

And your signed-of-by should probably look like:

Signed-off-by: Allan Zhang <allanzhang@...gle.com>

Thanks,
Song