netdev - Re: [PATCH net-next 6/7] tcp: populate inet->cork.fl.u.ip6 in tcp_v6_syn_recv

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Message-ID: <CAAVpQUCMNphu+3VCFGtR6RxsgTO22r_995_ZJ22kvHv_fQ=Z7Q@mail.gmail.com>
Date: Sat, 7 Feb 2026 13:49:19 -0800
From: Kuniyuki Iwashima <kuniyu@...gle.com>
To: Eric Dumazet <edumazet@...gle.com>
Cc: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, 
	Neal Cardwell <ncardwell@...gle.com>, David Ahern <dsahern@...nel.org>, netdev@...r.kernel.org, 
	eric.dumazet@...il.com
Subject: Re: [PATCH net-next 6/7] tcp: populate inet->cork.fl.u.ip6 in tcp_v6_syn_recv_sock()

On Fri, Feb 6, 2026 at 9:34 AM Eric Dumazet <edumazet@...gle.com> wrote:
>
> As explained in commit 85d05e281712 ("ipv6: change inet6_sk_rebuild_header()
> to use inet->cork.fl.u.ip6"):
>
> TCP v6 spends a good amount of time rebuilding a fresh fl6 at each
> transmit in inet6_csk_xmit()/inet6_csk_route_socket().
>
> TCP v4 caches the information in inet->cork.fl.u.ip4 instead.
>
> After this patch, passive TCP ipv6 flows have correctly initialized
> inet->cork.fl.u.ip6 structure.
>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Reviewed-by: Kuniyuki Iwashima <kuniyu@...gle.com>