netdev - RE: [PATCH v3] skmsg: lose offset info in sk_psock_skb

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Date:   Wed, 29 Sep 2021 02:08:10 +0000
From:   "liujian (CE)" <liujian56@...wei.com>
To:     Cong Wang <xiyou.wangcong@...il.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 v3] skmsg: lose offset info in sk_psock_skb_ingress



> -----Original Message-----
> From: Cong Wang [mailto:xiyou.wangcong@...il.com]
> Sent: Tuesday, September 28, 2021 1:52 PM
> To: liujian (CE) <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 v3] skmsg: lose offset info in sk_psock_skb_ingress
> 
> On Wed, Sep 22, 2021 at 2:32 AM Liu Jian <liujian56@...wei.com> wrote:
> >  static void sk_psock_skb_state(struct sk_psock *psock, @@ -604,6
> > +608,9 @@ static void sk_psock_backlog(struct work_struct *work)  {
> >         struct sk_psock *psock = container_of(work, struct sk_psock, work);
> >         struct sk_psock_work_state *state = &psock->work_state;
> > +#if IS_ENABLED(CONFIG_BPF_STREAM_PARSER)
> > +       struct strp_msg *stm = NULL;
> > +#endif
> >         struct sk_buff *skb = NULL;
> >         bool ingress;
> >         u32 len, off;
> > @@ -624,6 +631,13 @@ static void sk_psock_backlog(struct work_struct
> *work)
> >         while ((skb = skb_dequeue(&psock->ingress_skb))) {
> >                 len = skb->len;
> >                 off = 0;
> > +#if IS_ENABLED(CONFIG_BPF_STREAM_PARSER)
> > +               if (skb_bpf_strparser(skb)) {
> 
> If CONFIG_BPF_STREAM_PARSER is disabled, this should always return false,
> hence you don't need this #ifdef.
> Or alternatively, you can at least define for nop for
> skb_bpf_strparser() if !CONFIG_BPF_STREAM_PARSER.
> And you can move the above "stm" down here too.
> 
V4 has been sent, thank you~

> (Ditto for the other place below.)
> 
> Thanks.