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authorFlorin Coras <fcoras@cisco.com>2022-01-05 12:55:35 -0800
committerDave Barach <openvpp@barachs.net>2022-01-06 23:08:09 +0000
commitb56f24bbc474e2d5350b63268877ec713f903e70 (patch)
tree571ea7d80d65f54530dd1a6392fe69d5401b4a72 /src/vnet
parent0f8b91f5d8e4bc2f9a0166440abaf00b2bda29bb (diff)
tcp: exit retransmit before processing feedback
Type: refactor Signed-off-by: Florin Coras <fcoras@cisco.com> Change-Id: I5838e4c370d0c02a21b5eadb4af3baae781df097
Diffstat (limited to 'src/vnet')
-rw-r--r--src/vnet/tcp/tcp_input.c38
1 files changed, 17 insertions, 21 deletions
diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c
index 5f165c01b4c..058b1c0517e 100644
--- a/src/vnet/tcp/tcp_input.c
+++ b/src/vnet/tcp/tcp_input.c
@@ -742,7 +742,7 @@ tcp_should_fastrecover (tcp_connection_t * tc, u8 has_sack)
}
static int
-tcp_cc_recover (tcp_connection_t * tc)
+tcp_cc_try_recover (tcp_connection_t *tc)
{
sack_scoreboard_hole_t *hole;
u8 is_spurious = 0;
@@ -763,8 +763,7 @@ tcp_cc_recover (tcp_connection_t * tc)
if (tc->sack_sb.sacked_bytes)
{
tc->snd_congestion = tc->snd_nxt;
- tcp_program_retransmit (tc);
- return is_spurious;
+ return -1;
}
tc->rxt_delivered = 0;
@@ -790,7 +789,7 @@ tcp_cc_recover (tcp_connection_t * tc)
ASSERT (!tcp_in_cong_recovery (tc));
ASSERT (tcp_scoreboard_is_sane_post_recovery (tc));
- return is_spurious;
+ return 0;
}
static void
@@ -857,6 +856,20 @@ tcp_cc_handle_event (tcp_connection_t * tc, tcp_rate_sample_t * rs,
*/
/*
+ * See if we can exit and stop retransmitting
+ */
+ if (seq_geq (tc->snd_una, tc->snd_congestion))
+ {
+ /* If successfully recovered, treat ack as congestion avoidance ack
+ * and return. Otherwise, we're still congested so process feedback */
+ if (!tcp_cc_try_recover (tc))
+ {
+ tcp_cc_rcv_ack (tc, rs);
+ return;
+ }
+ }
+
+ /*
* Process (re)transmit feedback. Output path uses this to decide how much
* more data to release into the network
*/
@@ -890,23 +903,6 @@ tcp_cc_handle_event (tcp_connection_t * tc, tcp_rate_sample_t * rs,
tcp_fastrecovery_first_on (tc);
}
- /*
- * See if we can exit and stop retransmitting
- */
- if (seq_geq (tc->snd_una, tc->snd_congestion))
- {
- /* If spurious return, we've already updated everything */
- if (tcp_cc_recover (tc))
- {
- tc->tsecr_last_ack = tc->rcv_opts.tsecr;
- return;
- }
-
- /* Treat as congestion avoidance ack */
- tcp_cc_rcv_ack (tc, rs);
- return;
- }
-
tcp_program_retransmit (tc);
/*