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SubjectRe: [PATCH v3 net-next 2/2] tcp: minor optimization around tcp_hdr() usage in tcp receive path
On Mon, May 28, 2018 at 8:36 AM Yafang Shao <laoar.shao@gmail.com> wrote:

> This is additional to the commit ea1627c20c34 ("tcp: minor optimizations
around tcp_hdr() usage").
> At this point, skb->data is same with tcp_hdr() as tcp header has not
> been pulled yet.

> Cc: Eric Dumazet <edumazet@google.com>
> Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
> ---
> net/ipv4/tcp_ipv4.c | 2 +-
> net/ipv6/tcp_ipv6.c | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)

> diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
> index adbdb50..d179386 100644
> --- a/net/ipv4/tcp_ipv4.c
> +++ b/net/ipv4/tcp_ipv4.c
> @@ -1486,7 +1486,7 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff
*skb)
> sk->sk_rx_dst = NULL;
> }
> }
> - tcp_rcv_established(sk, skb, tcp_hdr(skb));
> + tcp_rcv_established(sk, skb, (const struct tcphdr
*)skb->data);
> return 0;
> }

> diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
> index 7d47c2b..1c633ff 100644
> --- a/net/ipv6/tcp_ipv6.c
> +++ b/net/ipv6/tcp_ipv6.c
> @@ -1322,7 +1322,7 @@ static int tcp_v6_do_rcv(struct sock *sk, struct
sk_buff *skb)
> }
> }

> - tcp_rcv_established(sk, skb, tcp_hdr(skb));
> + tcp_rcv_established(sk, skb, (const struct tcphdr
*)skb->data);
> if (opt_skb)
> goto ipv6_pktoptions;
> return 0;
> --
> 1.8.3.1


I would rather remove the third parameter of tcp_rcv_established() instead
of duplicating the cast.

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