Patch "tcp_bbr: fix pacing_gain to always be unity when using lt_bw" has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

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

    tcp_bbr: fix pacing_gain to always be unity when using lt_bw

to the 4.9-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_bbr-fix-pacing_gain-to-always-be-unity-when-using-lt_bw.patch
and it can be found in the queue-4.9 subdirectory.

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


>From foo@baz Tue Feb  6 12:42:23 PST 2018
From: Neal Cardwell <ncardwell@google.com>
Date: Wed, 31 Jan 2018 15:43:05 -0500
Subject: tcp_bbr: fix pacing_gain to always be unity when using lt_bw

From: Neal Cardwell <ncardwell@google.com>


[ Upstream commit 3aff3b4b986e51bcf4ab249e5d48d39596e0df6a ]

This commit fixes the pacing_gain to remain at BBR_UNIT (1.0) when
using lt_bw and returning from the PROBE_RTT state to PROBE_BW.

Previously, when using lt_bw, upon exiting PROBE_RTT and entering
PROBE_BW the bbr_reset_probe_bw_mode() code could sometimes randomly
end up with a cycle_idx of 0 and hence have bbr_advance_cycle_phase()
set a pacing gain above 1.0. In such cases this would result in a
pacing rate that is 1.25x higher than intended, potentially resulting
in a high loss rate for a little while until we stop using the lt_bw a
bit later.

This commit is a stable candidate for kernels back as far as 4.9.

Fixes: 0f8782ea1497 ("tcp_bbr: add BBR congestion control")
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Reported-by: Beyers Cronje <bcronje@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/ipv4/tcp_bbr.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/net/ipv4/tcp_bbr.c
+++ b/net/ipv4/tcp_bbr.c
@@ -452,7 +452,8 @@ static void bbr_advance_cycle_phase(stru
 
 	bbr->cycle_idx = (bbr->cycle_idx + 1) & (CYCLE_LEN - 1);
 	bbr->cycle_mstamp = tp->delivered_mstamp;
-	bbr->pacing_gain = bbr_pacing_gain[bbr->cycle_idx];
+	bbr->pacing_gain = bbr->lt_use_bw ? BBR_UNIT :
+					    bbr_pacing_gain[bbr->cycle_idx];
 }
 
 /* Gain cycling: cycle pacing gain to converge to fair share of available bw. */
@@ -461,8 +462,7 @@ static void bbr_update_cycle_phase(struc
 {
 	struct bbr *bbr = inet_csk_ca(sk);
 
-	if ((bbr->mode == BBR_PROBE_BW) && !bbr->lt_use_bw &&
-	    bbr_is_next_cycle_phase(sk, rs))
+	if (bbr->mode == BBR_PROBE_BW && bbr_is_next_cycle_phase(sk, rs))
 		bbr_advance_cycle_phase(sk);
 }
 


Patches currently in stable-queue which might be from ncardwell@google.com are

queue-4.9/tcp_bbr-fix-pacing_gain-to-always-be-unity-when-using-lt_bw.patch