commit 919fdad6bc54d0ed6e2ac842770e9e77c5cbc0a6
author Florin Coras <fcoras@cisco.com> Tue Dec 06 08:39:15 2022 -0800
committer Dave Barach <vpp@barachs.net> Wed Dec 07 21:29:33 2022 +0000
tree 809f38243cec771fdfba9e1490b57c5509d1efd3
parent 98a91e82608e6e30d4516b52556cdaaa9837ee24

tcp: avoid retransmit head with no data

Type: fix

Signed-off-by: Florin Coras <fcoras@cisco.com>
Change-Id: Iefabc7b9dd1109fd6dcf65e5d9794173421b7369

src/vnet/tcp/tcp_output.c

diff --git a/src/vnet/tcp/tcp_output.c b/src/vnet/tcp/tcp_output.c
index f503500..95480af 100644
--- a/src/vnet/tcp/tcp_output.c
+++ b/src/vnet/tcp/tcp_output.c
@@ -1749,7 +1749,7 @@
       && tc->rxt_head != tc->snd_una
       && tcp_retransmit_should_retry_head (tc, sb))
     {
-      max_bytes = clib_min (tc->snd_mss, tc->snd_congestion - tc->snd_una);
+      max_bytes = clib_min (tc->snd_mss, tc->snd_nxt - tc->snd_una);
       n_written = tcp_prepare_retransmit_segment (wrk, tc, 0, max_bytes, &b);
       if (!n_written)
 	{