From: Florin Coras <fcoras@cisco.com>
Date: Thu, 26 Mar 2020 02:45:39 +0000 (+0000)
Subject: tcp: count zero wnd enqueue attempts
X-Git-Tag: v20.09-rc0~295
X-Git-Url: https://gerrit.fd.io/r/gitweb?a=commitdiff_plain;h=refs%2Fchanges%2F55%2F26155%2F4;p=vpp.git

tcp: count zero wnd enqueue attempts

Type: improvement

Signed-off-by: Florin Coras <fcoras@cisco.com>
Change-Id: If22bad96a9102bc4058d52fc8565bd6a14c3c66c
---

diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c
index bc11461b521..86158b9d6c6 100755
--- a/src/vnet/tcp/tcp_input.c
+++ b/src/vnet/tcp/tcp_input.c
@@ -1942,6 +1942,10 @@ tcp_session_enqueue_data (tcp_connection_t * tc, vlib_buffer_t * b,
     }
   else
     {
+      /* Packet made it through for ack processing */
+      if (tc->rcv_wnd < tc->snd_mss)
+	return TCP_ERROR_ZERO_RWND;
+
       return TCP_ERROR_FIFO_FULL;
     }