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authorFlorin Coras <fcoras@cisco.com>2018-12-24 16:54:34 -0800
committerDamjan Marion <dmarion@me.com>2018-12-26 15:45:27 +0000
commit85a3ddd4c854c6217272d8be031cfcb04d2e7685 (patch)
treeec297721311d61dcf50d9137fb3c0230e279de1e /src/vnet/tcp
parenteb25abdfd8d39261430c73028c11b6a94cacf818 (diff)
tcp: separate active and passive establish timers
Change-Id: Ia2241e963cf45765d8d17c65eea781edbf74d4f9 Signed-off-by: Florin Coras <fcoras@cisco.com>
Diffstat (limited to 'src/vnet/tcp')
-rw-r--r--src/vnet/tcp/tcp.c80
-rw-r--r--src/vnet/tcp/tcp.h3
-rwxr-xr-xsrc/vnet/tcp/tcp_debug.h85
-rw-r--r--src/vnet/tcp/tcp_input.c13
-rw-r--r--src/vnet/tcp/tcp_output.c20
5 files changed, 107 insertions, 94 deletions
diff --git a/src/vnet/tcp/tcp.c b/src/vnet/tcp/tcp.c
index 8c8df00f098..4a63f3bc00c 100644
--- a/src/vnet/tcp/tcp.c
+++ b/src/vnet/tcp/tcp.c
@@ -172,7 +172,7 @@ tcp_half_open_connection_cleanup (tcp_connection_t * tc)
/* Make sure this is the owning thread */
if (tc->c_thread_index != vlib_get_thread_index ())
return 1;
- tcp_timer_reset (tc, TCP_TIMER_ESTABLISH);
+ tcp_timer_reset (tc, TCP_TIMER_ESTABLISH_AO);
tcp_timer_reset (tc, TCP_TIMER_RETRANSMIT_SYN);
tcp_half_open_connection_del (tc);
return 0;
@@ -308,6 +308,8 @@ tcp_connection_reset (tcp_connection_t * tc)
break;
case TCP_STATE_CLOSED:
break;
+ default:
+ TCP_DBG ("reset state: %u", tc->state);
}
}
@@ -333,7 +335,9 @@ tcp_connection_close (tcp_connection_t * tc)
switch (tc->state)
{
case TCP_STATE_SYN_SENT:
- /* Do nothing. Establish timer will pop and cleanup the connection */
+ /* Try to cleanup. If not on the right thread, mark as half-open done.
+ * Connection will be cleaned up when establish timer pops */
+ tcp_connection_cleanup (tc);
break;
case TCP_STATE_SYN_RCVD:
tcp_connection_timers_reset (tc);
@@ -349,7 +353,8 @@ tcp_connection_close (tcp_connection_t * tc)
tcp_connection_set_state (tc, TCP_STATE_FIN_WAIT_1);
/* Set a timer in case the peer stops responding. Otherwise the
* connection will be stuck here forever. */
- tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, TCP_FINWAIT1_TIME);
+ ASSERT (tc->timers[TCP_TIMER_WAITCLOSE] == TCP_TIMER_HANDLE_INVALID);
+ tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, TCP_FINWAIT1_TIME);
break;
case TCP_STATE_CLOSE_WAIT:
if (!session_tx_fifo_max_dequeue (&tc->connection))
@@ -367,17 +372,14 @@ tcp_connection_close (tcp_connection_t * tc)
break;
case TCP_STATE_CLOSED:
tcp_connection_timers_reset (tc);
+ /* Delete connection but instead of doing it now wait until next
+ * dispatch cycle to give the session layer a chance to clear
+ * unhandled events */
+ tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, TCP_CLEANUP_TIME);
break;
default:
TCP_DBG ("state: %u", tc->state);
}
-
- /* If in CLOSED and WAITCLOSE timer is not set, delete connection.
- * But instead of doing it now wait until next dispatch cycle to give
- * the session layer a chance to clear unhandled events */
- if (!tcp_timer_is_active (tc, TCP_TIMER_WAITCLOSE)
- && tc->state == TCP_STATE_CLOSED)
- tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, TCP_CLEANUP_TIME);
}
static void
@@ -393,9 +395,7 @@ tcp_session_cleanup (u32 conn_index, u32 thread_index)
{
tcp_connection_t *tc;
tc = tcp_connection_get (conn_index, thread_index);
- tcp_connection_timers_reset (tc);
- tc->state = TCP_STATE_CLOSED;
- TCP_EVT_DBG (TCP_EVT_STATE_CHANGE, tc);
+ tcp_connection_set_state (tc, TCP_STATE_CLOSED);
tcp_connection_cleanup (tc);
}
@@ -1217,39 +1217,45 @@ tcp_timer_establish_handler (u32 conn_index)
{
tcp_connection_t *tc;
- tc = tcp_half_open_connection_get (conn_index);
- if (tc)
- {
- ASSERT (tc->state == TCP_STATE_SYN_SENT);
- /* Notify app if we haven't tried to clean this up already */
- if (!(tc->flags & TCP_CONN_HALF_OPEN_DONE))
- session_stream_connect_notify (&tc->connection, 1 /* fail */ );
- }
- else
- {
- tc = tcp_connection_get (conn_index, vlib_get_thread_index ());
- /* note: the connection may have already disappeared */
- if (PREDICT_FALSE (tc == 0))
- return;
- ASSERT (tc->state == TCP_STATE_SYN_RCVD);
- /* Start cleanup. App wasn't notified yet so use delete notify as
- * opposed to delete to cleanup session layer state. */
- stream_session_delete_notify (&tc->connection);
- }
+ tc = tcp_connection_get (conn_index, vlib_get_thread_index ());
+ /* note: the connection may have already disappeared */
+ if (PREDICT_FALSE (tc == 0))
+ return;
+ ASSERT (tc->state == TCP_STATE_SYN_RCVD);
+ /* Start cleanup. App wasn't notified yet so use delete notify as
+ * opposed to delete to cleanup session layer state. */
+ stream_session_delete_notify (&tc->connection);
tc->timers[TCP_TIMER_ESTABLISH] = TCP_TIMER_HANDLE_INVALID;
tcp_connection_cleanup (tc);
}
static void
+tcp_timer_establish_ao_handler (u32 conn_index)
+{
+ tcp_connection_t *tc;
+
+ tc = tcp_half_open_connection_get (conn_index);
+ if (!tc)
+ return;
+
+ ASSERT (tc->state == TCP_STATE_SYN_SENT);
+ /* Notify app if we haven't tried to clean this up already */
+ if (!(tc->flags & TCP_CONN_HALF_OPEN_DONE))
+ session_stream_connect_notify (&tc->connection, 1 /* fail */ );
+
+ tc->timers[TCP_TIMER_ESTABLISH_AO] = TCP_TIMER_HANDLE_INVALID;
+ tcp_connection_cleanup (tc);
+}
+
+static void
tcp_timer_waitclose_handler (u32 conn_index)
{
- u32 thread_index = vlib_get_thread_index ();
+ u32 thread_index = vlib_get_thread_index (), rto;
tcp_connection_t *tc;
tc = tcp_connection_get (conn_index, thread_index);
if (!tc)
return;
-
tc->timers[TCP_TIMER_WAITCLOSE] = TCP_TIMER_HANDLE_INVALID;
switch (tc->state)
@@ -1287,8 +1293,9 @@ tcp_timer_waitclose_handler (u32 conn_index)
* is closed. We haven't sent everything but we did try. */
tcp_cong_recovery_off (tc);
tcp_send_fin (tc);
+ rto = clib_max (tc->rto >> tc->rto_boff, 1);
tcp_timer_set (tc, TCP_TIMER_WAITCLOSE,
- clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
+ clib_min (rto * TCP_TO_TIMER_TICK, TCP_2MSL_TIME));
session_stream_close_notify (&tc->connection);
}
else
@@ -1321,7 +1328,8 @@ static timer_expiration_handler *timer_expiration_handlers[TCP_N_TIMERS] =
tcp_timer_keep_handler,
tcp_timer_waitclose_handler,
tcp_timer_retransmit_syn_handler,
- tcp_timer_establish_handler
+ tcp_timer_establish_handler,
+ tcp_timer_establish_ao_handler,
};
/* *INDENT-ON* */
diff --git a/src/vnet/tcp/tcp.h b/src/vnet/tcp/tcp.h
index bd0fa9a7204..3848f03f1dc 100644
--- a/src/vnet/tcp/tcp.h
+++ b/src/vnet/tcp/tcp.h
@@ -74,7 +74,8 @@ format_function_t format_tcp_rcv_sacks;
_(KEEP, "KEEP") \
_(WAITCLOSE, "WAIT CLOSE") \
_(RETRANSMIT_SYN, "RETRANSMIT SYN") \
- _(ESTABLISH, "ESTABLISH")
+ _(ESTABLISH, "ESTABLISH") \
+ _(ESTABLISH_AO, "ESTABLISH_AO") \
typedef enum _tcp_timers
{
diff --git a/src/vnet/tcp/tcp_debug.h b/src/vnet/tcp/tcp_debug.h
index 5032588ca1e..b848d341dd7 100755
--- a/src/vnet/tcp/tcp_debug.h
+++ b/src/vnet/tcp/tcp_debug.h
@@ -388,6 +388,49 @@ if (_tc) \
ed->data[3] = _tc->snd_nxt - _tc->iss; \
ed->data[4] = _tc->rcv_nxt - _tc->irs; \
}
+
+#define TCP_EVT_TIMER_POP_HANDLER(_tc_index, _timer_id, ...) \
+{ \
+ tcp_connection_t *_tc; \
+ if (_timer_id == TCP_TIMER_RETRANSMIT_SYN \
+ || _timer_id == TCP_TIMER_ESTABLISH_AO) \
+ { \
+ _tc = tcp_half_open_connection_get (_tc_index); \
+ } \
+ else \
+ { \
+ u32 _thread_index = vlib_get_thread_index (); \
+ _tc = tcp_connection_get (_tc_index, _thread_index); \
+ } \
+ ELOG_TYPE_DECLARE (_e) = \
+ { \
+ .format = "timer-pop: %s (%d)", \
+ .format_args = "t4i4", \
+ .n_enum_strings = 8, \
+ .enum_strings = { \
+ "retransmit", \
+ "delack", \
+ "persist", \
+ "keep", \
+ "waitclose", \
+ "retransmit syn", \
+ "establish", \
+ "establish-ao", \
+ }, \
+ }; \
+ if (_tc) \
+ { \
+ DECLARE_ETD(_tc, _e, 2); \
+ ed->data[0] = _timer_id; \
+ ed->data[1] = _timer_id; \
+ } \
+ else \
+ { \
+ clib_warning ("pop %d for unexisting connection %d", _timer_id, \
+ _tc_index); \
+ } \
+}
+
#else
#define TCP_EVT_SYN_SENT_HANDLER(_tc, ...)
#define TCP_EVT_SYNACK_SENT_HANDLER(_tc, ...)
@@ -398,6 +441,7 @@ if (_tc) \
#define TCP_EVT_FIN_RCVD_HANDLER(_tc, ...)
#define TCP_EVT_RST_RCVD_HANDLER(_tc, ...)
#define TCP_EVT_STATE_CHANGE_HANDLER(_tc, ...)
+#define TCP_EVT_TIMER_POP_HANDLER(_tc_index, _timer_id, ...)
#endif
#if TCP_DEBUG_SM > 1
@@ -542,52 +586,11 @@ if (_av > 0) \
ed->data[4] = _tc->rcv_wnd - (_tc->rcv_nxt - _tc->rcv_las); \
}
-#define TCP_EVT_TIMER_POP_HANDLER(_tc_index, _timer_id, ...) \
-{ \
- tcp_connection_t *_tc; \
- if (_timer_id == TCP_TIMER_RETRANSMIT_SYN \
- || _timer_id == TCP_TIMER_ESTABLISH) \
- { \
- _tc = tcp_half_open_connection_get (_tc_index); \
- } \
- else \
- { \
- u32 _thread_index = vlib_get_thread_index (); \
- _tc = tcp_connection_get (_tc_index, _thread_index); \
- } \
- ELOG_TYPE_DECLARE (_e) = \
- { \
- .format = "timer-pop: %s (%d)", \
- .format_args = "t4i4", \
- .n_enum_strings = 7, \
- .enum_strings = { \
- "retransmit", \
- "delack", \
- "persist", \
- "keep", \
- "waitclose", \
- "retransmit syn", \
- "establish", \
- }, \
- }; \
- if (_tc) \
- { \
- DECLARE_ETD(_tc, _e, 2); \
- ed->data[0] = _timer_id; \
- ed->data[1] = _timer_id; \
- } \
- else \
- { \
- clib_warning ("pop %d for unexisting connection %d", _timer_id, \
- _tc_index); \
- } \
-}
#else
#define TCP_EVT_ACK_SENT_HANDLER(_tc, ...)
#define TCP_EVT_ACK_RCVD_HANDLER(_tc, ...)
#define TCP_EVT_PKTIZE_HANDLER(_tc, ...)
#define TCP_EVT_INPUT_HANDLER(_tc, _type, _len, _written, ...)
-#define TCP_EVT_TIMER_POP_HANDLER(_tc_index, _timer_id, ...)
#endif
/*
diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c
index fe1476a2d1c..3da02ac6b10 100644
--- a/src/vnet/tcp/tcp_input.c
+++ b/src/vnet/tcp/tcp_input.c
@@ -2452,7 +2452,7 @@ tcp46_syn_sent_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
new_tc0->c_thread_index = my_thread_index;
new_tc0->rcv_nxt = vnet_buffer (b0)->tcp.seq_end;
new_tc0->irs = seq0;
- new_tc0->timers[TCP_TIMER_ESTABLISH] = TCP_TIMER_HANDLE_INVALID;
+ new_tc0->timers[TCP_TIMER_ESTABLISH_AO] = TCP_TIMER_HANDLE_INVALID;
new_tc0->timers[TCP_TIMER_RETRANSMIT_SYN] = TCP_TIMER_HANDLE_INVALID;
new_tc0->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
@@ -2775,7 +2775,7 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
* to send. Enable waitclose though because we're willing to
* wait for peer's FIN but not indefinitely. */
tcp_connection_timers_reset (tc0);
- tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME);
+ tcp_timer_set (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME);
/* Don't try to deq the FIN acked */
if (tc0->burst_acked > 1)
@@ -2805,7 +2805,7 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
tcp_send_fin (tc0);
tcp_connection_timers_reset (tc0);
tcp_connection_set_state (tc0, TCP_STATE_LAST_ACK);
- tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME);
+ tcp_timer_set (tc0, TCP_TIMER_WAITCLOSE, TCP_2MSL_TIME);
}
}
break;
@@ -2816,8 +2816,9 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
if (tcp_rcv_ack (wrk, tc0, b0, tcp0, &error0))
goto drop;
+ tcp_connection_timers_reset (tc0);
tcp_connection_set_state (tc0, TCP_STATE_TIME_WAIT);
- tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME);
+ tcp_timer_set (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME);
goto drop;
break;
@@ -2846,7 +2847,7 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
* we can't ensure that we have no packets already enqueued
* to output. Rely instead on the waitclose timer */
tcp_connection_timers_reset (tc0);
- tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_CLEANUP_TIME);
+ tcp_timer_set (tc0, TCP_TIMER_WAITCLOSE, TCP_CLEANUP_TIME);
goto drop;
@@ -2931,7 +2932,7 @@ tcp46_rcv_process_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
tc0->rcv_nxt += 1;
tcp_connection_set_state (tc0, TCP_STATE_TIME_WAIT);
tcp_connection_timers_reset (tc0);
- tcp_timer_update (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME);
+ tcp_timer_set (tc0, TCP_TIMER_WAITCLOSE, TCP_TIMEWAIT_TIME);
tcp_program_ack (wrk, tc0);
break;
case TCP_STATE_TIME_WAIT:
diff --git a/src/vnet/tcp/tcp_output.c b/src/vnet/tcp/tcp_output.c
index 5f48d410126..97f5b81f9e8 100644
--- a/src/vnet/tcp/tcp_output.c
+++ b/src/vnet/tcp/tcp_output.c
@@ -994,7 +994,7 @@ tcp_send_syn (tcp_connection_t * tc)
* Setup retransmit and establish timers before requesting buffer
* such that we can return if we've ran out.
*/
- tcp_timer_set (tc, TCP_TIMER_ESTABLISH, TCP_ESTABLISH_TIME);
+ tcp_timer_set (tc, TCP_TIMER_ESTABLISH_AO, TCP_ESTABLISH_TIME);
tcp_timer_update (tc, TCP_TIMER_RETRANSMIT_SYN,
tc->rto * TCP_TO_TIMER_TICK);
@@ -1096,7 +1096,9 @@ tcp_send_fin (tcp_connection_t * tc)
{
/* Out of buffers so program fin retransmit ASAP */
tcp_timer_update (tc, TCP_TIMER_RETRANSMIT, 1);
- goto post_enqueue;
+ if (fin_snt)
+ tc->snd_nxt = tc->snd_una_max;
+ return;
}
tcp_retransmit_timer_force_update (tc);
@@ -1106,7 +1108,6 @@ tcp_send_fin (tcp_connection_t * tc)
tcp_enqueue_to_output_now (wrk, b, bi, tc->c_is_ip4);
TCP_EVT_DBG (TCP_EVT_FIN_SENT, tc);
-post_enqueue:
if (!fin_snt)
{
tc->flags |= TCP_CONN_FINSNT;
@@ -1538,9 +1539,12 @@ tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
{
tc = tcp_connection_get (index, thread_index);
/* Note: the connection may have been closed and pool_put */
- if (PREDICT_FALSE (tc == 0 || tc->state < TCP_STATE_SYN_RCVD))
+ if (PREDICT_FALSE (tc == 0 || tc->state == TCP_STATE_SYN_SENT))
return;
tc->timers[TCP_TIMER_RETRANSMIT] = TCP_TIMER_HANDLE_INVALID;
+ /* Wait-close and retransmit could pop at the same time */
+ if (tc->state == TCP_STATE_CLOSED)
+ return;
}
if (tc->state >= TCP_STATE_ESTABLISHED)
@@ -1595,8 +1599,7 @@ tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
/* Send one segment. Note that n_bytes may be zero due to buffer
* shortfall */
n_bytes = tcp_prepare_retransmit_segment (wrk, tc, 0, tc->snd_mss, &b);
-
- if (n_bytes == 0)
+ if (!n_bytes)
{
tcp_retransmit_timer_force_update (tc);
return;
@@ -1620,10 +1623,7 @@ tcp_timer_retransmit_handler_i (u32 index, u8 is_syn)
if (tc->flags & TCP_CONN_HALF_OPEN_DONE)
{
if (tcp_half_open_connection_cleanup (tc))
- {
- clib_warning ("could not remove half-open connection");
- ASSERT (0);
- }
+ TCP_DBG ("could not remove half-open connection");
return;
}