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Diffstat (limited to 'src/vnet/tcp/tcp_output.c')
-rw-r--r--src/vnet/tcp/tcp_output.c22
1 files changed, 18 insertions, 4 deletions
diff --git a/src/vnet/tcp/tcp_output.c b/src/vnet/tcp/tcp_output.c
index c56eadf8fdd..0255551318a 100644
--- a/src/vnet/tcp/tcp_output.c
+++ b/src/vnet/tcp/tcp_output.c
@@ -1452,15 +1452,29 @@ tcp_timer_persist_handler (u32 index)
/* Make sure timer handle is set to invalid */
tc->timers[TCP_TIMER_PERSIST] = TCP_TIMER_HANDLE_INVALID;
- offset = tc->snd_una_max - tc->snd_una;
/* Problem already solved or worse */
- available_bytes = stream_session_tx_fifo_max_dequeue (&tc->connection);
if (tc->state == TCP_STATE_CLOSED || tc->state > TCP_STATE_ESTABLISHED
- || tc->snd_wnd > tc->snd_mss || tcp_in_recovery (tc)
- || !available_bytes || available_bytes <= offset)
+ || tc->snd_wnd > tc->snd_mss || tcp_in_recovery (tc))
return;
+ available_bytes = stream_session_tx_fifo_max_dequeue (&tc->connection);
+ offset = tc->snd_una_max - tc->snd_una;
+
+ /* Reprogram persist if no new bytes available to send. We may have data
+ * next time */
+ if (!available_bytes)
+ {
+ tcp_persist_timer_set (tc);
+ return;
+ }
+
+ if (available_bytes <= offset)
+ {
+ ASSERT (tcp_timer_is_active (tc, TCP_TIMER_RETRANSMIT));
+ return;
+ }
+
/* Increment RTO backoff */
tc->rto_boff += 1;
tc->rto = clib_min (tc->rto << 1, TCP_RTO_MAX);