Subject: [PATCH 16/32] tcp_bbr: fix quantization code to not raise cwnd if not probing bandwidth

From: "Kevin(Yudong) Yang" <[email-masked]>
Date: Thu, 26 Sep 2019 10:30:05 -0400

[ Upstream commit 6b3656a60f2067738d1a423328199720806f0c44 ]

There was a bug in the previous logic that attempted to ensure gain cycling
gets inflight above BDP even for small BDPs. This code correctly raised and
lowered target inflight values during the gain cycle. And this code
correctly ensured that cwnd was raised when probing bandwidth. However, it
did not correspondingly ensure that cwnd was *not* raised in this way when
*not* probing for bandwidth. The result was that small-BDP flows that were
always cwnd-bound could go for many cycles with a fixed cwnd, and not probe
or yield bandwidth at all. This meant that multiple small-BDP flows could
fail to converge in their bandwidth allocations.

Fixes: 3c346b233c68 ("tcp_bbr: fix bw probing to raise in-flight data for very small BDPs")
Signed-off-by: Kevin(Yudong) Yang <[email-masked]>
Acked-by: Neal Cardwell <[email-masked]>
Acked-by: Yuchung Cheng <[email-masked]>
Acked-by: Soheil Hassas Yeganeh <[email-masked]>
Acked-by: Priyaranjan Jha <[email-masked]>
Signed-off-by: David S. Miller <[email-masked]>
---
 net/ipv4/tcp_bbr.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/ipv4/tcp_bbr.c b/net/ipv4/tcp_bbr.c
index 56be7d27f208..00ade9c185ea 100644
--- a/net/ipv4/tcp_bbr.c
+++ b/net/ipv4/tcp_bbr.c
@@ -386,7 +386,7 @@ static u32 bbr_bdp(struct sock *sk, u32 bw, int gain)
  * which allows 2 outstanding 2-packet sequences, to try to keep pipe
  * full even with ACK-every-other-packet delayed ACKs.
  */
-static u32 bbr_quantization_budget(struct sock *sk, u32 cwnd, int gain)
+static u32 bbr_quantization_budget(struct sock *sk, u32 cwnd)
 {
 	struct bbr *bbr = inet_csk_ca(sk);
 
@@ -397,7 +397,7 @@ static u32 bbr_quantization_budget(struct sock *sk, u32 cwnd, int gain)
 	cwnd = (cwnd + 1) & ~1U;
 
 	/* Ensure gain cycling gets inflight above BDP even for small BDPs. */
-	if (bbr->mode == BBR_PROBE_BW && gain > BBR_UNIT)
+	if (bbr->mode == BBR_PROBE_BW && bbr->cycle_idx == 0)
 		cwnd += 2;
 
 	return cwnd;
@@ -409,7 +409,7 @@ static u32 bbr_inflight(struct sock *sk, u32 bw, int gain)
 	u32 inflight;
 
 	inflight = bbr_bdp(sk, bw, gain);
-	inflight = bbr_quantization_budget(sk, inflight, gain);
+	inflight = bbr_quantization_budget(sk, inflight);
 
 	return inflight;
 }
@@ -529,7 +529,7 @@ static void bbr_set_cwnd(struct sock *sk, const struct rate_sample *rs,
 	 * due to aggregation (of data and/or ACKs) visible in the ACK stream.
 	 */
 	target_cwnd += bbr_ack_aggregation_cwnd(sk);
-	target_cwnd = bbr_quantization_budget(sk, target_cwnd, gain);
+	target_cwnd = bbr_quantization_budget(sk, target_cwnd);
 
 	/* If we're below target cwnd, slow start cwnd toward target cwnd. */
 	if (bbr_full_bw_reached(sk))  /* only cut cwnd if we filled the pipe */
-- 
2.20.1