2024-12-10 00:17:37 +03:00
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From 31adbbdcafaeac73d39cae76c6d513fea28779f1 Mon Sep 17 00:00:00 2001
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2024-10-29 05:12:06 +03:00
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From: Neal Cardwell <ncardwell@google.com>
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Date: Mon, 21 Sep 2020 14:46:26 -0400
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Subject: [PATCH 14/19] net-tcp_bbr: v2: introduce is_acking_tlp_retrans_seq
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into rate_sample
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Introduce is_acking_tlp_retrans_seq into rate_sample. This bool will
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export to the CC module the knowledge of whether the current ACK
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matched a TLP retransmit.
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Note that when this bool is true, we cannot yet tell (in general) whether
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this ACK is for the original or the TLP retransmit.
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Effort: net-tcp_bbr
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Change-Id: I2e6494332167e75efcbdc99bd5c119034e9c39b4
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Signed-off-by: Alexandre Frade <kernel@xanmod.org>
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---
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include/net/tcp.h | 1 +
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net/ipv4/tcp_input.c | 12 +++++++++---
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2 files changed, 10 insertions(+), 3 deletions(-)
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--- a/include/net/tcp.h
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+++ b/include/net/tcp.h
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2024-12-10 00:17:37 +03:00
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@@ -1162,6 +1162,7 @@ struct rate_sample {
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2024-10-29 05:12:06 +03:00
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u32 last_end_seq; /* end_seq of most recently ACKed packet */
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bool is_app_limited; /* is sample from packet with bubble in pipe? */
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bool is_retrans; /* is sample from retransmission? */
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+ bool is_acking_tlp_retrans_seq; /* ACKed a TLP retransmit sequence? */
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bool is_ack_delayed; /* is this (likely) a delayed ACK? */
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bool is_ece; /* did this ACK have ECN marked? */
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};
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--- a/net/ipv4/tcp_input.c
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+++ b/net/ipv4/tcp_input.c
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@@ -3842,7 +3842,8 @@ static void tcp_replace_ts_recent(struct
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/* This routine deals with acks during a TLP episode and ends an episode by
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* resetting tlp_high_seq. Ref: TLP algorithm in draft-ietf-tcpm-rack
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*/
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-static void tcp_process_tlp_ack(struct sock *sk, u32 ack, int flag)
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+static void tcp_process_tlp_ack(struct sock *sk, u32 ack, int flag,
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+ struct rate_sample *rs)
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{
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struct tcp_sock *tp = tcp_sk(sk);
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@@ -3870,6 +3871,11 @@ static void tcp_process_tlp_ack(struct s
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FLAG_NOT_DUP | FLAG_DATA_SACKED))) {
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/* Pure dupack: original and TLP probe arrived; no loss */
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tp->tlp_high_seq = 0;
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+ } else {
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+ /* This ACK matches a TLP retransmit. We cannot yet tell if
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+ * this ACK is for the original or the TLP retransmit.
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+ */
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+ rs->is_acking_tlp_retrans_seq = 1;
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}
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}
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@@ -4053,7 +4059,7 @@ static int tcp_ack(struct sock *sk, cons
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tcp_rack_update_reo_wnd(sk, &rs);
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if (tp->tlp_high_seq)
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- tcp_process_tlp_ack(sk, ack, flag);
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+ tcp_process_tlp_ack(sk, ack, flag, &rs);
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if (tcp_ack_is_dubious(sk, flag)) {
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if (!(flag & (FLAG_SND_UNA_ADVANCED |
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@@ -4097,7 +4103,7 @@ no_queue:
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tcp_ack_probe(sk);
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if (tp->tlp_high_seq)
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- tcp_process_tlp_ack(sk, ack, flag);
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+ tcp_process_tlp_ack(sk, ack, flag, &rs);
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return 1;
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old_ack:
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