tcp: handle cleanups without timers
Type: improvement
Signed-off-by: Florin Coras <fcoras@cisco.com>
Change-Id: Ida896e9fbe83b4c76578b089bb3fd2bef5e07fd2
diff --git a/src/vnet/tcp/tcp.c b/src/vnet/tcp/tcp.c
index e243f5a..2ada8b8 100644
--- a/src/vnet/tcp/tcp.c
+++ b/src/vnet/tcp/tcp.c
@@ -327,6 +327,18 @@
pool_put (wrk->connections, tc);
}
+void
+tcp_program_cleanup (tcp_worker_ctx_t * wrk, tcp_connection_t * tc)
+{
+ tcp_cleanup_req_t *req;
+ clib_time_type_t now;
+
+ now = transport_time_now (tc->c_thread_index);
+ clib_fifo_add2 (wrk->pending_cleanups, req);
+ req->connection_index = tc->c_c_index;
+ req->free_time = now + tcp_cfg.cleanup_time;
+}
+
/**
* Begin connection closing procedure.
*
@@ -366,8 +378,8 @@
tcp_send_reset (tc);
tcp_connection_timers_reset (tc);
tcp_connection_set_state (tc, TCP_STATE_CLOSED);
- tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.closewait_time);
session_transport_closed_notify (&tc->connection);
+ tcp_program_cleanup (tcp_get_worker (tc->c_thread_index), tc);
tcp_worker_stats_inc (tc->c_thread_index, rst_unread, 1);
break;
}
@@ -396,11 +408,7 @@
tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.finwait1_time);
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_cfg.cleanup_time);
+ /* Cleanup should've been programmed already */
break;
default:
TCP_DBG ("state: %u", tc->state);
@@ -431,12 +439,12 @@
{
tcp_connection_t *tc;
tc = tcp_connection_get (conn_index, thread_index);
- session_transport_closed_notify (&tc->connection);
tcp_send_reset (tc);
tcp_connection_timers_reset (tc);
tcp_cong_recovery_off (tc);
tcp_connection_set_state (tc, TCP_STATE_CLOSED);
- tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time);
+ session_transport_closed_notify (&tc->connection);
+ tcp_program_cleanup (tcp_get_worker (thread_index), tc);
}
/**
@@ -1295,17 +1303,19 @@
static void
tcp_timer_waitclose_handler (tcp_connection_t * tc)
{
+ tcp_worker_ctx_t *wrk = tcp_get_worker (tc->c_thread_index);
+
switch (tc->state)
{
case TCP_STATE_CLOSE_WAIT:
tcp_connection_timers_reset (tc);
- session_transport_closed_notify (&tc->connection);
/* App never returned with a close */
if (!(tc->flags & TCP_CONN_FINPNDG))
{
tcp_connection_set_state (tc, TCP_STATE_CLOSED);
- tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time);
- tcp_worker_stats_inc (tc->c_thread_index, to_closewait, 1);
+ session_transport_closed_notify (&tc->connection);
+ tcp_program_cleanup (wrk, tc);
+ tcp_workerp_stats_inc (wrk, to_closewait, 1);
break;
}
@@ -1315,57 +1325,62 @@
tc->snd_nxt = tc->snd_una;
tcp_send_fin (tc);
tcp_connection_set_state (tc, TCP_STATE_LAST_ACK);
+ session_transport_closed_notify (&tc->connection);
/* Make sure we don't wait in LAST ACK forever */
tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.lastack_time);
- tcp_worker_stats_inc (tc->c_thread_index, to_closewait2, 1);
+ tcp_workerp_stats_inc (wrk, to_closewait2, 1);
/* Don't delete the connection yet */
break;
case TCP_STATE_FIN_WAIT_1:
tcp_connection_timers_reset (tc);
- session_transport_closed_notify (&tc->connection);
if (tc->flags & TCP_CONN_FINPNDG)
{
/* If FIN pending, we haven't sent everything, but we did try.
* Notify session layer that transport is closed. */
tcp_connection_set_state (tc, TCP_STATE_CLOSED);
tcp_send_reset (tc);
- tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time);
+ tcp_program_cleanup (wrk, tc);
}
else
{
/* We've sent the fin but no progress. Close the connection and
* to make sure everything is flushed, setup a cleanup timer */
tcp_connection_set_state (tc, TCP_STATE_CLOSED);
- tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time);
+ tcp_program_cleanup (wrk, tc);
}
- tcp_worker_stats_inc (tc->c_thread_index, to_finwait1, 1);
+ session_transport_closed_notify (&tc->connection);
+ tcp_workerp_stats_inc (wrk, to_finwait1, 1);
break;
case TCP_STATE_LAST_ACK:
tcp_connection_timers_reset (tc);
tcp_connection_set_state (tc, TCP_STATE_CLOSED);
- tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time);
session_transport_closed_notify (&tc->connection);
- tcp_worker_stats_inc (tc->c_thread_index, to_lastack, 1);
+ tcp_program_cleanup (wrk, tc);
+ tcp_workerp_stats_inc (wrk, to_lastack, 1);
break;
case TCP_STATE_CLOSING:
tcp_connection_timers_reset (tc);
tcp_connection_set_state (tc, TCP_STATE_CLOSED);
- tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time);
session_transport_closed_notify (&tc->connection);
- tcp_worker_stats_inc (tc->c_thread_index, to_closing, 1);
+ tcp_program_cleanup (wrk, tc);
+ tcp_workerp_stats_inc (wrk, to_closing, 1);
break;
case TCP_STATE_FIN_WAIT_2:
tcp_send_reset (tc);
tcp_connection_timers_reset (tc);
tcp_connection_set_state (tc, TCP_STATE_CLOSED);
session_transport_closed_notify (&tc->connection);
- tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time);
- tcp_worker_stats_inc (tc->c_thread_index, to_finwait2, 1);
+ tcp_program_cleanup (wrk, tc);
+ tcp_workerp_stats_inc (wrk, to_finwait2, 1);
+ break;
+ case TCP_STATE_TIME_WAIT:
+ tcp_connection_set_state (tc, TCP_STATE_CLOSED);
+ tcp_program_cleanup (wrk, tc);
break;
default:
- tcp_connection_del (tc);
+ clib_warning ("waitclose in state: %U", format_tcp_state, tc->state);
break;
}
}
@@ -1439,11 +1454,31 @@
}
static void
+tcp_handle_cleanups (tcp_worker_ctx_t * wrk, clib_time_type_t now)
+{
+ u32 thread_index = wrk->vm->thread_index;
+ tcp_cleanup_req_t *req;
+ tcp_connection_t *tc;
+
+ while (clib_fifo_elts (wrk->pending_cleanups))
+ {
+ req = clib_fifo_head (wrk->pending_cleanups);
+ if (req->free_time > now)
+ break;
+ clib_fifo_sub2 (wrk->pending_cleanups, req);
+ tc = tcp_connection_get (req->connection_index, thread_index);
+ session_transport_delete_notify (&tc->connection);
+ tcp_connection_cleanup (tc);
+ }
+}
+
+static void
tcp_update_time (f64 now, u8 thread_index)
{
tcp_worker_ctx_t *wrk = tcp_get_worker (thread_index);
tcp_set_time_now (wrk);
+ tcp_handle_cleanups (wrk, now);
tw_timer_expire_timers_16t_2w_512sl (&wrk->timer_wheel, now);
tcp_dispatch_pending_timers (wrk);
tcp_flush_frames_to_output (wrk);
@@ -1718,7 +1753,7 @@
tcp_cfg.lastack_time = 300; /* 30s */
tcp_cfg.finwait2_time = 300; /* 30s */
tcp_cfg.closing_time = 300; /* 30s */
- tcp_cfg.cleanup_time = 1; /* 0.1s */
+ tcp_cfg.cleanup_time = 0.1; /* 100ms */
}
static clib_error_t *
@@ -1868,7 +1903,7 @@
else if (unformat (input, "closing-time %u", &tmp_time))
tcp_cfg.closing_time = tmp_time / TCP_TIMER_TICK;
else if (unformat (input, "cleanup-time %u", &tmp_time))
- tcp_cfg.cleanup_time = tmp_time / TCP_TIMER_TICK;
+ tcp_cfg.cleanup_time = tmp_time / 1000.0;
else
return clib_error_return (0, "unknown input `%U'",
format_unformat_error, input);
diff --git a/src/vnet/tcp/tcp.h b/src/vnet/tcp/tcp.h
index bef7edb..6094ac5 100644
--- a/src/vnet/tcp/tcp.h
+++ b/src/vnet/tcp/tcp.h
@@ -522,6 +522,12 @@
#undef _
} tcp_wrk_stats_t;
+typedef struct tcp_free_req_
+{
+ clib_time_type_t free_time;
+ u32 connection_index;
+} tcp_cleanup_req_t;
+
typedef struct tcp_worker_ctx_
{
CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
@@ -561,6 +567,9 @@
/* Fifo of pending timer expirations */
u32 *pending_timers;
+ /* fifo of pending free requests */
+ tcp_cleanup_req_t *pending_cleanups;
+
/** worker timer wheel */
tw_timer_wheel_16t_2w_512sl_t timer_wheel;
@@ -634,8 +643,8 @@
/** Timer ticks to wait in closing for fin ack */
u16 closing_time;
- /** Timer ticks to wait before cleaning up the connection */
- u16 cleanup_time;
+ /** Time to wait (sec) before cleaning up the connection */
+ f32 cleanup_time;
/** Number of preallocated connections */
u32 preallocated_connections;
@@ -1090,6 +1099,7 @@
void tcp_connection_tx_pacer_update (tcp_connection_t * tc);
void tcp_connection_tx_pacer_reset (tcp_connection_t * tc, u32 window,
u32 start_bucket);
+void tcp_program_cleanup (tcp_worker_ctx_t * wrk, tcp_connection_t * tc);
always_inline void
tcp_cc_rcv_ack (tcp_connection_t * tc, tcp_rate_sample_t * rs)
diff --git a/src/vnet/tcp/tcp_input.c b/src/vnet/tcp/tcp_input.c
index adbfe7a..e93e8ba 100755
--- a/src/vnet/tcp/tcp_input.c
+++ b/src/vnet/tcp/tcp_input.c
@@ -332,12 +332,10 @@
break;
case TCP_STATE_ESTABLISHED:
tcp_connection_timers_reset (tc);
- /* Set the cleanup timer, in case the session layer/app don't
- * cleanly close the connection */
- tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.closewait_time);
tcp_cong_recovery_off (tc);
tcp_program_reset_ntf (wrk, tc);
tcp_connection_set_state (tc, TCP_STATE_CLOSED);
+ tcp_program_cleanup (wrk, tc);
break;
case TCP_STATE_CLOSE_WAIT:
case TCP_STATE_FIN_WAIT_1:
@@ -345,12 +343,12 @@
case TCP_STATE_CLOSING:
case TCP_STATE_LAST_ACK:
tcp_connection_timers_reset (tc);
- tcp_timer_set (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.closewait_time);
tcp_cong_recovery_off (tc);
tcp_program_reset_ntf (wrk, tc);
/* Make sure we mark the session as closed. In some states we may
* be still trying to send data */
tcp_connection_set_state (tc, TCP_STATE_CLOSED);
+ tcp_program_cleanup (wrk, tc);
break;
case TCP_STATE_CLOSED:
case TCP_STATE_TIME_WAIT:
@@ -3029,9 +3027,8 @@
if (tc0->flags & TCP_CONN_FINRCVD)
{
tcp_connection_set_state (tc0, TCP_STATE_CLOSED);
- tcp_timer_set (tc0, TCP_TIMER_WAITCLOSE,
- tcp_cfg.cleanup_time);
session_transport_closed_notify (&tc0->connection);
+ tcp_program_cleanup (wrk, tc0);
goto drop;
}
@@ -3112,7 +3109,7 @@
* 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_set (tc0, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time);
+ tcp_program_cleanup (tcp_get_worker (tc0->c_thread_index), tc0);
goto drop;
diff --git a/src/vnet/tcp/tcp_output.c b/src/vnet/tcp/tcp_output.c
index 5eccda6..91021e8 100644
--- a/src/vnet/tcp/tcp_output.c
+++ b/src/vnet/tcp/tcp_output.c
@@ -1473,7 +1473,7 @@
session_transport_closing_notify (&tc->connection);
session_transport_closed_notify (&tc->connection);
tcp_connection_timers_reset (tc);
- tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.closewait_time);
+ tcp_program_cleanup (wrk, tc);
tcp_workerp_stats_inc (wrk, tr_abort, 1);
return;
}
@@ -1525,7 +1525,7 @@
{
tcp_connection_set_state (tc, TCP_STATE_CLOSED);
tcp_connection_timers_reset (tc);
- tcp_timer_update (tc, TCP_TIMER_WAITCLOSE, tcp_cfg.cleanup_time);
+ tcp_program_cleanup (wrk, tc);
tcp_workerp_stats_inc (wrk, tr_abort, 1);
return;
}