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mptcp: keep rcv_mwnd_seq in sync with subflow rcv_wnd 

MPTCP shares a receive window across subflows and applies it at the
subflow level by adjusting each subflow's rcv_wnd when needed.  With
the new TCP tracking of the maximum advertised window sequence,
rcv_mwnd_seq must stay consistent with these subflow-level rcv_wnd
adjustments.

Signed-off-by: Simon Baatz <gmbnomis@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20260309-tcp_rfc7323_retract_wnd_rfc-v3-2-4c7f96b1ec69@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
master
Simon Baatz 2026-03-09 09:02:27 +01:00 committed by Jakub Kicinski
parent 0e24d17bd9
commit 81714374a2
1 changed files with 4 additions and 2 deletions
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6
net/mptcp/options.c
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@ -1076,6 +1076,7 @@ static void rwin_update(struct mptcp_sock *msk, struct sock *ssk,
* resync.
*/
tp->rcv_wnd += mptcp_rcv_wnd - subflow->rcv_wnd_sent;
tcp_update_max_rcv_wnd_seq(tp);
subflow->rcv_wnd_sent = mptcp_rcv_wnd;
}
@ -1338,8 +1339,9 @@ raise_win:
*/
rcv_wnd_new = rcv_wnd_old;
win = rcv_wnd_old - ack_seq;
tp->rcv_wnd = min_t(u64, win, U32_MAX);
new_win = tp->rcv_wnd;
new_win = min_t(u64, win, U32_MAX);
tp->rcv_wnd = new_win;
tcp_update_max_rcv_wnd_seq(tp);
/* Make sure we do not exceed the maximum possible
* scaled window.