From eff6b82e905f39aa740db38341626d8d615282fa Mon Sep 17 00:00:00 2001
From: Florin Coras <fcoras@cisco.com>
Date: Wed, 3 Jul 2019 19:51:02 -0700
Subject: tcp: add cc algo undo recovery notification

Type:feature

Change-Id: Iedefe87555f0a0033abed8569bc2995c8f523d7e
Signed-off-by: Florin Coras <fcoras@cisco.com>
---
 src/vnet/tcp/tcp.h       | 14 ++++++++++++++
 src/vnet/tcp/tcp_input.c | 27 +++++++++------------------
 2 files changed, 23 insertions(+), 18 deletions(-)

diff --git a/src/vnet/tcp/tcp.h b/src/vnet/tcp/tcp.h
index 2bc6f22ba83..f2626af9da8 100644
--- a/src/vnet/tcp/tcp.h
+++ b/src/vnet/tcp/tcp.h
@@ -387,6 +387,7 @@ struct _tcp_cc_algorithm
   void (*congestion) (tcp_connection_t * tc);
   void (*loss) (tcp_connection_t * tc);
   void (*recovered) (tcp_connection_t * tc);
+  void (*undo_recovery) (tcp_connection_t * tc);
 };
 /* *INDENT-ON* */
 
@@ -965,6 +966,19 @@ tcp_cc_loss (tcp_connection_t * tc)
   tc->cc_algo->loss (tc);
 }
 
+static inline void
+tcp_cc_recovered (tcp_connection_t * tc)
+{
+  tc->cc_algo->recovered (tc);
+}
+
+static inline void
+tcp_cc_undo_recovery (tcp_connection_t * tc)
+{
+  if (tc->cc_algo->undo_recovery)
+    tc->cc_algo->undo_recovery (tc);
+}
+
 always_inline void
 tcp_timer_set (tcp_connection_t * tc, u8 timer_id, u32 interval)
 {
diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c
index 5a7ae5eb2ab..50860ab1c8d 100644
--- a/src/vnet/tcp/tcp_input.c
+++ b/src/vnet/tcp/tcp_input.c
@@ -1183,8 +1183,9 @@ tcp_cc_recovery_exit (tcp_connection_t * tc)
   TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 3);
 }
 
-static inline void
-tcp_cc_fastrecovery_clear_inline (tcp_connection_t * tc)
+#ifndef CLIB_MARCH_VARIANT
+void
+tcp_cc_fastrecovery_clear (tcp_connection_t * tc)
 {
   tc->snd_rxt_bytes = 0;
   tc->rcv_dupacks = 0;
@@ -1195,20 +1196,6 @@ tcp_cc_fastrecovery_clear_inline (tcp_connection_t * tc)
 
   TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 3);
 }
-
-static void
-tcp_cc_fastrecovery_exit (tcp_connection_t * tc)
-{
-  tc->cc_algo->recovered (tc);
-  tcp_cc_fastrecovery_clear_inline (tc);
-}
-
-#ifndef CLIB_MARCH_VARIANT
-void
-tcp_cc_fastrecovery_clear (tcp_connection_t * tc)
-{
-  tcp_cc_fastrecovery_clear_inline (tc);
-}
 #endif /* CLIB_MARCH_VARIANT */
 
 static void
@@ -1224,8 +1211,9 @@ tcp_cc_congestion_undo (tcp_connection_t * tc)
     }
   else if (tcp_in_fastrecovery (tc))
     {
-      tcp_cc_fastrecovery_exit (tc);
+      tcp_cc_fastrecovery_clear (tc);
     }
+  tcp_cc_undo_recovery (tc);
   ASSERT (tc->rto_boff == 0);
   TCP_EVT_DBG (TCP_EVT_CC_EVT, tc, 5);
 }
@@ -1266,7 +1254,10 @@ tcp_cc_recover (tcp_connection_t * tc)
   if (tcp_in_recovery (tc))
     tcp_cc_recovery_exit (tc);
   else if (tcp_in_fastrecovery (tc))
-    tcp_cc_fastrecovery_exit (tc);
+    {
+      tcp_cc_recovered (tc);
+      tcp_cc_fastrecovery_clear (tc);
+    }
 
   ASSERT (tc->rto_boff == 0);
   ASSERT (!tcp_in_cong_recovery (tc));
-- 
cgit 1.2.3-korg