Konstantin Demin
8cbaf1dea2
3rd patchs (in alphabetical order): - bbr3 - ntsync5 - openwrt - pf-kernel - xanmod - zen no configuration changes for now
60 lines
2.0 KiB
Diff
60 lines
2.0 KiB
Diff
From 99e86f904f246ae9ec7a13d1b920eaf4a8c2d47b Mon Sep 17 00:00:00 2001
|
|
From: Adithya Abraham Philip <abrahamphilip@google.com>
|
|
Date: Fri, 11 Jun 2021 21:56:10 +0000
|
|
Subject: [PATCH 17/19] net-tcp_bbr: v3: ensure ECN-enabled BBR flows set ECT
|
|
on retransmits
|
|
|
|
Adds a new flag TCP_ECN_ECT_PERMANENT that is used by CCAs to
|
|
indicate that retransmitted packets and pure ACKs must have the
|
|
ECT bit set. This is necessary for BBR, which when using
|
|
ECN expects ECT to be set even on retransmitted packets and ACKs.
|
|
|
|
Previous to this addition of TCP_ECN_ECT_PERMANENT, CCAs which can use
|
|
ECN but don't "need" it did not have a way to indicate that ECT should
|
|
be set on retransmissions/ACKs.
|
|
|
|
Signed-off-by: Adithya Abraham Philip <abrahamphilip@google.com>
|
|
Signed-off-by: Neal Cardwell <ncardwell@google.com>
|
|
Change-Id: I8b048eaab35e136fe6501ef6cd89fd9faa15e6d2
|
|
Signed-off-by: Alexandre Frade <kernel@xanmod.org>
|
|
---
|
|
include/net/tcp.h | 1 +
|
|
net/ipv4/tcp_bbr.c | 3 +++
|
|
net/ipv4/tcp_output.c | 3 ++-
|
|
3 files changed, 6 insertions(+), 1 deletion(-)
|
|
|
|
--- a/include/net/tcp.h
|
|
+++ b/include/net/tcp.h
|
|
@@ -376,6 +376,7 @@ static inline void tcp_dec_quickack_mode
|
|
#define TCP_ECN_DEMAND_CWR 4
|
|
#define TCP_ECN_SEEN 8
|
|
#define TCP_ECN_LOW 16
|
|
+#define TCP_ECN_ECT_PERMANENT 32
|
|
|
|
enum tcp_tw_status {
|
|
TCP_TW_SUCCESS = 0,
|
|
--- a/net/ipv4/tcp_bbr.c
|
|
+++ b/net/ipv4/tcp_bbr.c
|
|
@@ -2151,6 +2151,9 @@ __bpf_kfunc static void bbr_init(struct
|
|
bbr->plb.pause_until = 0;
|
|
|
|
tp->fast_ack_mode = bbr_fast_ack_mode ? 1 : 0;
|
|
+
|
|
+ if (bbr_can_use_ecn(sk))
|
|
+ tp->ecn_flags |= TCP_ECN_ECT_PERMANENT;
|
|
}
|
|
|
|
/* BBR marks the current round trip as a loss round. */
|
|
--- a/net/ipv4/tcp_output.c
|
|
+++ b/net/ipv4/tcp_output.c
|
|
@@ -390,7 +390,8 @@ static void tcp_ecn_send(struct sock *sk
|
|
th->cwr = 1;
|
|
skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
|
|
}
|
|
- } else if (!tcp_ca_needs_ecn(sk)) {
|
|
+ } else if (!(tp->ecn_flags & TCP_ECN_ECT_PERMANENT) &&
|
|
+ !tcp_ca_needs_ecn(sk)) {
|
|
/* ACK or retransmitted segment: clear ECT|CE */
|
|
INET_ECN_dontxmit(sk);
|
|
}
|