netdev - Re: [PATCH v4] skmsg: lose offset info in sk_psock_skb

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Date:   Tue, 28 Sep 2021 22:19:16 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Liu Jian <liujian56@...wei.com>
Cc:     John Fastabend <john.fastabend@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jakub Sitnicki <jakub@...udflare.com>,
        Lorenz Bauer <lmb@...udflare.com>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        KP Singh <kpsingh@...nel.org>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH v4] skmsg: lose offset info in sk_psock_skb_ingress

On Tue, Sep 28, 2021 at 7:06 PM Liu Jian <liujian56@...wei.com> wrote:
>
> If sockmap enable strparser, there are lose offset info in
> sk_psock_skb_ingress. If the length determined by parse_msg function
> is not skb->len, the skb will be converted to sk_msg multiple times,
> and userspace app will get the data multiple times.
>
> Fix this by get the offset and length from strp_msg.
> And as Cong suggestion, add one bit in skb->_sk_redir to distinguish
> enable or disable strparser.
>
> Signed-off-by: Liu Jian <liujian56@...wei.com>
> ---
> v1->v2: fix build error when disable CONFIG_BPF_STREAM_PARSER
> v2->v3: Add one bit in skb->_sk_redir to distinguish enable or disable strparser
> v3->v4: Remove "#if IS_ENABLED(CONFIG_BPF_STREAM_PARSER)" code;
>         and let "stm" have a more precise scope.

Looks much cleaner now.

Reviewed-by: Cong Wang <cong.wang@...edance.com>

Thanks.