46 lines
1.7 KiB
Diff
46 lines
1.7 KiB
Diff
From 687f09c22583ec5ef52aa93844248c9f93a2ce6e Mon Sep 17 00:00:00 2001
|
|
From: Jianfeng Wang <jfwang@google.com>
|
|
Date: Fri, 19 Jun 2020 17:33:45 +0000
|
|
Subject: [PATCH 12/19] net-tcp_bbr: v2: record app-limited status of
|
|
TLP-repaired flight
|
|
|
|
When sending a TLP retransmit, record whether the outstanding flight
|
|
of data is application limited. This is important for congestion
|
|
control modules that want to respond to losses repaired by TLP
|
|
retransmits. This is important because the following scenarios convey
|
|
very different information:
|
|
(1) a packet loss with a small number of packets in flight;
|
|
(2) a packet loss with the maximum amount of data in flight allowed
|
|
by the CC module;
|
|
|
|
Effort: net-tcp_bbr
|
|
Change-Id: Ic8ae567caa4e4bfd5fd82c3d4be12a5d9171655e
|
|
Signed-off-by: Alexandre Frade <kernel@xanmod.org>
|
|
---
|
|
include/linux/tcp.h | 3 ++-
|
|
net/ipv4/tcp_output.c | 1 +
|
|
2 files changed, 3 insertions(+), 1 deletion(-)
|
|
|
|
--- a/include/linux/tcp.h
|
|
+++ b/include/linux/tcp.h
|
|
@@ -370,7 +370,8 @@ struct tcp_sock {
|
|
u8 dup_ack_counter:2,
|
|
tlp_retrans:1, /* TLP is a retransmission */
|
|
fast_ack_mode:2, /* which fast ack mode ? */
|
|
- unused:3;
|
|
+ tlp_orig_data_app_limited:1, /* app-limited before TLP rtx? */
|
|
+ unused:2;
|
|
u8 thin_lto : 1,/* Use linear timeouts for thin streams */
|
|
fastopen_connect:1, /* FASTOPEN_CONNECT sockopt */
|
|
fastopen_no_cookie:1, /* Allow send/recv SYN+data without a cookie */
|
|
--- a/net/ipv4/tcp_output.c
|
|
+++ b/net/ipv4/tcp_output.c
|
|
@@ -3003,6 +3003,7 @@ void tcp_send_loss_probe(struct sock *sk
|
|
if (WARN_ON(!skb || !tcp_skb_pcount(skb)))
|
|
goto rearm_timer;
|
|
|
|
+ tp->tlp_orig_data_app_limited = TCP_SKB_CB(skb)->tx.is_app_limited;
|
|
if (__tcp_retransmit_skb(sk, skb, 1))
|
|
goto rearm_timer;
|
|
|