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Message-Id: <20210727144258.946533-2-ncardwell@google.com>
Date: Tue, 27 Jul 2021 10:42:57 -0400
From: Neal Cardwell <ncardwell@...gle.com>
To: David Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
Yuchung Cheng <ycheng@...gle.com>,
Neal Cardwell <ncardwell@...gle.com>,
Priyaranjan Jha <priyarjha@...gle.com>
Subject: [PATCH net-next 1/2] tcp: more accurately detect spurious TLP probes
From: Yuchung Cheng <ycheng@...gle.com>
Previously TLP is considered spurious if the sender receives any
DSACK during a TLP episode. This patch further checks the DSACK
sequences match the TLP's to improve accuracy.
Signed-off-by: Yuchung Cheng <ycheng@...gle.com>
Acked-by: Neal Cardwell <ncardwell@...gle.com>
Acked-by: Priyaranjan Jha <priyarjha@...gle.com>
---
net/ipv4/tcp_input.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 501d8d4d4ba4..98408d520c32 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -100,6 +100,7 @@ int sysctl_tcp_max_orphans __read_mostly = NR_FILE;
#define FLAG_UPDATE_TS_RECENT 0x4000 /* tcp_replace_ts_recent() */
#define FLAG_NO_CHALLENGE_ACK 0x8000 /* do not call tcp_send_challenge_ack() */
#define FLAG_ACK_MAYBE_DELAYED 0x10000 /* Likely a delayed ACK */
+#define FLAG_DSACK_TLP 0x20000 /* DSACK for tail loss probe */
#define FLAG_ACKED (FLAG_DATA_ACKED|FLAG_SYN_ACKED)
#define FLAG_NOT_DUP (FLAG_DATA|FLAG_WIN_UPDATE|FLAG_ACKED)
@@ -991,6 +992,8 @@ static u32 tcp_dsack_seen(struct tcp_sock *tp, u32 start_seq,
return 0;
if (seq_len > tp->mss_cache)
dup_segs = DIV_ROUND_UP(seq_len, tp->mss_cache);
+ else if (tp->tlp_high_seq && tp->tlp_high_seq == end_seq)
+ state->flag |= FLAG_DSACK_TLP;
tp->dsack_dups += dup_segs;
/* Skip the DSACK if dup segs weren't retransmitted by sender */
@@ -3650,7 +3653,7 @@ static void tcp_process_tlp_ack(struct sock *sk, u32 ack, int flag)
if (!tp->tlp_retrans) {
/* TLP of new data has been acknowledged */
tp->tlp_high_seq = 0;
- } else if (flag & FLAG_DSACKING_ACK) {
+ } else if (flag & FLAG_DSACK_TLP) {
/* This DSACK means original and TLP probe arrived; no loss */
tp->tlp_high_seq = 0;
} else if (after(ack, tp->tlp_high_seq)) {
--
2.32.0.432.gabb21c7263-goog
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