Patch "net: fix the RTO timer retransmitting skb every 1ms if linear option is enabled" has been added to the 6.1-stable tree

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This is a note to let you know that I've just added the patch titled

    net: fix the RTO timer retransmitting skb every 1ms if linear option is enabled

to the 6.1-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:
     net-fix-the-rto-timer-retransmitting-skb-every-1ms-if-linear-option-is-enabled.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From e4dd0d3a2f64b8bd8029ec70f52bdbebd0644408 Mon Sep 17 00:00:00 2001
From: Jason Xing <kernelxing@xxxxxxxxxxx>
Date: Fri, 11 Aug 2023 10:37:47 +0800
Subject: net: fix the RTO timer retransmitting skb every 1ms if linear option is enabled

From: Jason Xing <kernelxing@xxxxxxxxxxx>

commit e4dd0d3a2f64b8bd8029ec70f52bdbebd0644408 upstream.

In the real workload, I encountered an issue which could cause the RTO
timer to retransmit the skb per 1ms with linear option enabled. The amount
of lost-retransmitted skbs can go up to 1000+ instantly.

The root cause is that if the icsk_rto happens to be zero in the 6th round
(which is the TCP_THIN_LINEAR_RETRIES value), then it will always be zero
due to the changed calculation method in tcp_retransmit_timer() as follows:

icsk->icsk_rto = min(icsk->icsk_rto << 1, TCP_RTO_MAX);

Above line could be converted to
icsk->icsk_rto = min(0 << 1, TCP_RTO_MAX) = 0

Therefore, the timer expires so quickly without any doubt.

I read through the RFC 6298 and found that the RTO value can be rounded
up to a certain value, in Linux, say TCP_RTO_MIN as default, which is
regarded as the lower bound in this patch as suggested by Eric.

Fixes: 36e31b0af587 ("net: TCP thin linear timeouts")
Suggested-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: Jason Xing <kernelxing@xxxxxxxxxxx>
Reviewed-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/ipv4/tcp_timer.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -586,7 +586,9 @@ out_reset_timer:
 	    tcp_stream_is_thin(tp) &&
 	    icsk->icsk_retransmits <= TCP_THIN_LINEAR_RETRIES) {
 		icsk->icsk_backoff = 0;
-		icsk->icsk_rto = min(__tcp_set_rto(tp), TCP_RTO_MAX);
+		icsk->icsk_rto = clamp(__tcp_set_rto(tp),
+				       tcp_rto_min(sk),
+				       TCP_RTO_MAX);
 	} else {
 		/* Use normal (exponential) backoff */
 		icsk->icsk_rto = min(icsk->icsk_rto << 1, TCP_RTO_MAX);


Patches currently in stable-queue which might be from kernelxing@xxxxxxxxxxx are

queue-6.1/net-fix-the-rto-timer-retransmitting-skb-every-1ms-if-linear-option-is-enabled.patch



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