tcp: send unsent data in fast recovery

[vpp.git] / src / vnet / tcp / tcp.c

diff --git a/src/vnet/tcp/tcp.c b/src/vnet/tcp/tcp.c
index 1fb95b3..f8e74a8 100644 (file)
--- a/src/vnet/tcp/tcp.c
+++ b/src/vnet/tcp/tcp.c
@@ -972,13 +972,13 @@ format_tcp_scoreboard (u8 * s, va_list * args)
 
   hole = scoreboard_first_hole (sb);
   if (hole)
-    s = format (s, "\n%Uhead %u tail %u %u holes:\n", format_white_space,
-               indent, sb->head, sb->tail, pool_elts (sb->holes));
+    s = format (s, "\n%Uhead %u tail %u %u holes:\n%U", format_white_space,
+               indent, sb->head, sb->tail, pool_elts (sb->holes),
+               format_white_space, indent);
 
   while (hole)
     {
-      s = format (s, "%U%U", format_white_space, indent, format_tcp_sack_hole,
-                 hole, tc);
+      s = format (s, "%U", format_tcp_sack_hole, hole, tc);
       hole = scoreboard_next_hole (sb, hole);
     }
 
@@ -1051,38 +1051,25 @@ tcp_snd_space_inline (tcp_connection_t * tc)
 {
   int snd_space, snt_limited;
 
-  if (PREDICT_TRUE (!tcp_in_fastrecovery (tc)))
-    {
-      snd_space = tcp_available_output_snd_space (tc);
-
-      /* If we haven't gotten dupacks or if we did and have gotten sacked
-       * bytes then we can still send as per Limited Transmit (RFC3042) */
-      if (PREDICT_FALSE (tc->rcv_dupacks != 0
-                        && (tcp_opts_sack_permitted (tc)
-                            && tc->sack_sb.last_sacked_bytes == 0)))
-       {
-         if (tc->rcv_dupacks == 1 && tc->limited_transmit != tc->snd_nxt)
-           tc->limited_transmit = tc->snd_nxt;
-         ASSERT (seq_leq (tc->limited_transmit, tc->snd_nxt));
+  if (PREDICT_FALSE (tcp_in_fastrecovery (tc)))
+    return 0;
 
-         snt_limited = tc->snd_nxt - tc->limited_transmit;
-         snd_space = clib_max (2 * tc->snd_mss - snt_limited, 0);
-       }
-      return tcp_round_snd_space (tc, snd_space);
-    }
+  snd_space = tcp_available_output_snd_space (tc);
 
-  /* RFC 5681: When previously unsent data is available and the new value of
-   * cwnd and the receiver's advertised window allow, a TCP SHOULD send 1*SMSS
-   * bytes of previously unsent data. */
-  if (tcp_in_fastrecovery (tc) && !tcp_fastrecovery_sent_1_smss (tc))
+  /* If we haven't gotten dupacks or if we did and have gotten sacked
+   * bytes then we can still send as per Limited Transmit (RFC3042) */
+  if (PREDICT_FALSE (tc->rcv_dupacks != 0
+                    && (tcp_opts_sack_permitted (tc)
+                        && tc->sack_sb.last_sacked_bytes == 0)))
     {
-      if (tcp_available_cc_snd_space (tc) < tc->snd_mss)
-       return 0;
-      tcp_fastrecovery_1_smss_on (tc);
-      return tc->snd_mss;
-    }
+      if (tc->rcv_dupacks == 1 && tc->limited_transmit != tc->snd_nxt)
+       tc->limited_transmit = tc->snd_nxt;
+      ASSERT (seq_leq (tc->limited_transmit, tc->snd_nxt));
 
-  return 0;
+      snt_limited = tc->snd_nxt - tc->limited_transmit;
+      snd_space = clib_max (2 * tc->snd_mss - snt_limited, 0);
+    }
+  return tcp_round_snd_space (tc, snd_space);
 }
 
 u32