netdev - Re: [PATCH bpf] libbpf: fix missing section "sk_skb/skb

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Message-ID: <YaU9Mdv+7kEa4JOJ@unknown>
Date:   Mon, 29 Nov 2021 12:50:57 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Song Liu <song@...nel.org>
Cc:     Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Cong Wang <cong.wang@...edance.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        Jakub Sitnicki <jakub@...udflare.com>
Subject: Re: [PATCH bpf] libbpf: fix missing section "sk_skb/skb_verdict"

On Fri, Nov 26, 2021 at 04:20:34PM -0800, Song Liu wrote:
> On Fri, Nov 26, 2021 at 12:45 PM Cong Wang <xiyou.wangcong@...il.com> wrote:
> >
> > From: Cong Wang <cong.wang@...edance.com>
> >
> > When BPF_SK_SKB_VERDICT was introduced, I forgot to add
> > a section mapping for it in libbpf.
> >
> > Fixes: a7ba4558e69a ("sock_map: Introduce BPF_SK_SKB_VERDICT")
> > Cc: Daniel Borkmann <daniel@...earbox.net>
> > Cc: John Fastabend <john.fastabend@...il.com>
> > Cc: Jakub Sitnicki <jakub@...udflare.com>
> > Signed-off-by: Cong Wang <cong.wang@...edance.com>
> 
> The patch looks good to me. But seems the selftests are OK without this. So,
> do we really need this?
> 

Not sure if I understand this question.

At least BPF_SK_SKB_STREAM_PARSER and BPF_SK_SKB_STREAM_VERDICT are already
there, so either we should remove all of them or add BPF_SK_SKB_VERDICT for
completeness.

Or are you suggesting we should change it back in selftests too? Note, it was
changed by Andrii in commit 15669e1dcd75fe6d51e495f8479222b5884665b6:

-SEC("sk_skb/skb_verdict")
+SEC("sk_skb")

Thanks.