tcp: use scaled window for new connects

Change-Id: Idf83fce8ca176e57b323e3741034e3223f1d195a
Signed-off-by: Florin Coras <fcoras@cisco.com>

3 files changed, 12 insertions, 5 deletions

diff --git a/src/vnet/tcp/tcp.c b/src/vnet/tcp/tcp.c
index d00f4abb118..30e5899577a 100644
--- a/src/vnet/tcp/tcp.c
+++ b/src/vnet/tcp/tcp.c
@@ -1017,8 +1017,8 @@ tcp_round_snd_space (tcp_connection_t * tc, u32 snd_space)
  * @param tc tcp connection
  * @return number of bytes session is allowed to write
  */
-static u32
-tcp_snd_space (tcp_connection_t * tc)
+static inline u32
+tcp_snd_space_inline (tcp_connection_t * tc)
 {
   int snd_space, snt_limited;
 
@@ -1066,11 +1066,17 @@ tcp_snd_space (tcp_connection_t * tc)
   return 0;
 }
 
+u32
+tcp_snd_space (tcp_connection_t * tc)
+{
+  return tcp_snd_space_inline (tc);
+}
+
 static u32
 tcp_session_send_space (transport_connection_t * trans_conn)
 {
   tcp_connection_t *tc = (tcp_connection_t *) trans_conn;
-  return clib_min (tcp_snd_space (tc),
+  return clib_min (tcp_snd_space_inline (tc),
 		   tc->snd_wnd - (tc->snd_nxt - tc->snd_una));
 }
 
diff --git a/src/vnet/tcp/tcp.h b/src/vnet/tcp/tcp.h
index 37b4573cf25..165659b6d9f 100644
--- a/src/vnet/tcp/tcp.h
+++ b/src/vnet/tcp/tcp.h
@@ -658,6 +658,7 @@ tcp_is_lost_fin (tcp_connection_t * tc)
   return 0;
 }
 
+u32 tcp_snd_space (tcp_connection_t * tc);
 void tcp_retransmit_first_unacked (tcp_connection_t * tc);
 void tcp_fast_retransmit_no_sack (tcp_connection_t * tc);
 void tcp_fast_retransmit_sack (tcp_connection_t * tc);
diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c
index b66e940a377..d297ee7ed3e 100644
--- a/src/vnet/tcp/tcp_input.c
+++ b/src/vnet/tcp/tcp_input.c
@@ -2282,8 +2282,8 @@ tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
 	  if (tcp_opts_wscale (&new_tc0->rcv_opts))
 	    new_tc0->snd_wscale = new_tc0->rcv_opts.wscale;
 
-	  /* RFC1323: SYN and SYN-ACK wnd not scaled */
-	  new_tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window);
+	  new_tc0->snd_wnd = clib_net_to_host_u16 (tcp0->window)
+	    << new_tc0->snd_wscale;
 	  new_tc0->snd_wl1 = seq0;
 	  new_tc0->snd_wl2 = ack0;