This is a note to let you know that I've just added the patch titled
tcp: Update window clamping condition
to the 6.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tcp-update-window-clamping-condition.patch
and it can be found in the queue-6.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 4321f96793b0ba696158b175bf2bc0e2c68a6dfc
Author: Subash Abhinov Kasiviswanathan <quic_subashab@xxxxxxxxxxx>
Date: Thu Aug 8 16:06:40 2024 -0700
tcp: Update window clamping condition
[ Upstream commit a2cbb1603943281a604f5adc48079a148db5cb0d ]
This patch is based on the discussions between Neal Cardwell and
Eric Dumazet in the link
https://lore.kernel.org/netdev/20240726204105.1466841-1-quic_subashab@xxxxxxxxxxx/
It was correctly pointed out that tp->window_clamp would not be
updated in cases where net.ipv4.tcp_moderate_rcvbuf=0 or if
(copied <= tp->rcvq_space.space). While it is expected for most
setups to leave the sysctl enabled, the latter condition may
not end up hitting depending on the TCP receive queue size and
the pattern of arriving data.
The updated check should be hit only on initial MSS update from
TCP_MIN_MSS to measured MSS value and subsequently if there was
an update to a larger value.
Fixes: 05f76b2d634e ("tcp: Adjust clamping window for applications specifying SO_RCVBUF")
Signed-off-by: Sean Tranchetti <quic_stranche@xxxxxxxxxxx>
Signed-off-by: Subash Abhinov Kasiviswanathan <quic_subashab@xxxxxxxxxxx>
Acked-by: Neal Cardwell <ncardwell@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index ecd521108559f..2c52f6dcbd290 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -238,9 +238,14 @@ static void tcp_measure_rcv_mss(struct sock *sk, const struct sk_buff *skb)
*/
if (unlikely(len != icsk->icsk_ack.rcv_mss)) {
u64 val = (u64)skb->len << TCP_RMEM_TO_WIN_SCALE;
+ u8 old_ratio = tcp_sk(sk)->scaling_ratio;
do_div(val, skb->truesize);
tcp_sk(sk)->scaling_ratio = val ? val : 1;
+
+ if (old_ratio != tcp_sk(sk)->scaling_ratio)
+ WRITE_ONCE(tcp_sk(sk)->window_clamp,
+ tcp_win_from_space(sk, sk->sk_rcvbuf));
}
icsk->icsk_ack.rcv_mss = min_t(unsigned int, len,
tcp_sk(sk)->advmss);
@@ -754,7 +759,8 @@ void tcp_rcv_space_adjust(struct sock *sk)
* <prev RTT . ><current RTT .. ><next RTT .... >
*/
- if (READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_moderate_rcvbuf)) {
+ if (READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_moderate_rcvbuf) &&
+ !(sk->sk_userlocks & SOCK_RCVBUF_LOCK)) {
u64 rcvwin, grow;
int rcvbuf;
@@ -770,22 +776,12 @@ void tcp_rcv_space_adjust(struct sock *sk)
rcvbuf = min_t(u64, tcp_space_from_win(sk, rcvwin),
READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_rmem[2]));
- if (!(sk->sk_userlocks & SOCK_RCVBUF_LOCK)) {
- if (rcvbuf > sk->sk_rcvbuf) {
- WRITE_ONCE(sk->sk_rcvbuf, rcvbuf);
-
- /* Make the window clamp follow along. */
- WRITE_ONCE(tp->window_clamp,
- tcp_win_from_space(sk, rcvbuf));
- }
- } else {
- /* Make the window clamp follow along while being bounded
- * by SO_RCVBUF.
- */
- int clamp = tcp_win_from_space(sk, min(rcvbuf, sk->sk_rcvbuf));
+ if (rcvbuf > sk->sk_rcvbuf) {
+ WRITE_ONCE(sk->sk_rcvbuf, rcvbuf);
- if (clamp > tp->window_clamp)
- WRITE_ONCE(tp->window_clamp, clamp);
+ /* Make the window clamp follow along. */
+ WRITE_ONCE(tp->window_clamp,
+ tcp_win_from_space(sk, rcvbuf));
}
}
tp->rcvq_space.space = copied;
