netdev - Re: [PATCH net-next] tcp: remove unnecessary update for tp->write_seq in tcp

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Message-ID: <CANn89iLLe1-XxnqDqZbJZGmCGypFVf_22o+ZYqBkXX4cRgN8FQ@mail.gmail.com>
Date: Mon, 23 Sep 2024 17:11:55 +0200
From: Eric Dumazet <edumazet@...gle.com>
To: "xin.guo" <guoxin0309@...il.com>
Cc: netdev@...r.kernel.org
Subject: Re: [PATCH net-next] tcp: remove unnecessary update for tp->write_seq
 in tcp_connect()

On Mon, Sep 23, 2024 at 5:01 PM xin.guo <guoxin0309@...il.com> wrote:
>
> From: "xin.guo" <guoxin0309@...il.com>
>
> Commit 783237e8daf13("net-tcp: Fast Open client - sending SYN-data")
> introduce tcp_connect_queue_skb() and it would overwrite tcp->write_seq,
> so it is no need to update tp->write_seq before invoking
> tcp_connect_queue_skb()
>
> Signed-off-by: xin.guo <guoxin0309@...il.com>
> ---
>  net/ipv4/tcp_output.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
> index 4fd746b..f255c7d 100644
> --- a/net/ipv4/tcp_output.c
> +++ b/net/ipv4/tcp_output.c
> @@ -4134,7 +4134,7 @@ int tcp_connect(struct sock *sk)
>         if (unlikely(!buff))
>                 return -ENOBUFS;
>
> -       tcp_init_nondata_skb(buff, tp->write_seq++, TCPHDR_SYN);
> +       tcp_init_nondata_skb(buff, tp->write_seq, TCPHDR_SYN);
>         tcp_mstamp_refresh(tp);
>         tp->retrans_stamp = tcp_time_stamp_ts(tp);
>         tcp_connect_queue_skb(sk, buff);

This seems fine, but net-next is currently closed.

Documentation/process/maintainer-netdev.rst  for the details.