2 * Copyright (c) 2008, 2009 Nicira Networks.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
26 #include "openflow/openflow.h"
27 #include "poll-loop.h"
33 #define THIS_MODULE VLM_rconn
38 STATE(BACKOFF, 1 << 1) \
39 STATE(CONNECTING, 1 << 2) \
40 STATE(ACTIVE, 1 << 3) \
43 #define STATE(NAME, VALUE) S_##NAME = VALUE,
49 state_name(enum state state
)
52 #define STATE(NAME, VALUE) case S_##NAME: return #NAME;
59 /* A reliable connection to an OpenFlow switch or controller.
61 * See the large comment in rconn.h for more information. */
74 time_t backoff_deadline
;
76 time_t last_connected
;
77 unsigned int packets_sent
;
80 /* In S_ACTIVE and S_IDLE, probably_admitted reports whether we believe
81 * that the peer has made a (positive) admission control decision on our
82 * connection. If we have not yet been (probably) admitted, then the
83 * connection does not reset the timer used for deciding whether the switch
84 * should go into fail-open mode.
86 * last_admitted reports the last time we believe such a positive admission
87 * control decision was made. */
88 bool probably_admitted
;
91 /* These values are simply for statistics reporting, not used directly by
92 * anything internal to the rconn (or ofproto for that matter). */
93 unsigned int packets_received
;
94 unsigned int n_attempted_connections
, n_successful_connections
;
96 unsigned long int total_time_connected
;
98 /* If we can't connect to the peer, it could be for any number of reasons.
99 * Usually, one would assume it is because the peer is not running or
100 * because the network is partitioned. But it could also be because the
101 * network topology has changed, in which case the upper layer will need to
102 * reassess it (in particular, obtain a new IP address via DHCP and find
103 * the new location of the controller). We set this flag when we suspect
104 * that this could be the case. */
105 bool questionable_connectivity
;
106 time_t last_questioned
;
108 /* Throughout this file, "probe" is shorthand for "inactivity probe".
109 * When nothing has been received from the peer for a while, we send out
110 * an echo request as an inactivity probe packet. We should receive back
112 int probe_interval
; /* Secs of inactivity before sending probe. */
114 /* When we create a vconn we obtain these values, to save them past the end
115 * of the vconn's lifetime. Otherwise, in-band control will only allow
116 * traffic when a vconn is actually open, but it is nice to allow ARP to
117 * complete even between connection attempts, and it is also polite to
118 * allow traffic from other switches to go through to the controller
119 * whether or not we are connected.
121 * We don't cache the local port, because that changes from one connection
122 * attempt to the next. */
123 uint32_t local_ip
, remote_ip
;
124 uint16_t remote_port
;
126 /* Messages sent or received are copied to the monitor connections. */
127 #define MAX_MONITORS 8
128 struct vconn
*monitors
[8];
132 static unsigned int elapsed_in_this_state(const struct rconn
*);
133 static unsigned int timeout(const struct rconn
*);
134 static bool timed_out(const struct rconn
*);
135 static void state_transition(struct rconn
*, enum state
);
136 static void set_vconn_name(struct rconn
*, const char *name
);
137 static int try_send(struct rconn
*);
138 static int reconnect(struct rconn
*);
139 static void disconnect(struct rconn
*, int error
);
140 static void flush_queue(struct rconn
*);
141 static void question_connectivity(struct rconn
*);
142 static void copy_to_monitor(struct rconn
*, const struct ofpbuf
*);
143 static bool is_connected_state(enum state
);
144 static bool is_admitted_msg(const struct ofpbuf
*);
146 /* Creates a new rconn, connects it (reliably) to 'name', and returns it. */
148 rconn_new(const char *name
, int inactivity_probe_interval
, int max_backoff
)
150 struct rconn
*rc
= rconn_create(inactivity_probe_interval
, max_backoff
);
151 rconn_connect(rc
, name
);
155 /* Creates a new rconn, connects it (unreliably) to 'vconn', and returns it. */
157 rconn_new_from_vconn(const char *name
, struct vconn
*vconn
)
159 struct rconn
*rc
= rconn_create(60, 0);
160 rconn_connect_unreliably(rc
, name
, vconn
);
164 /* Creates and returns a new rconn.
166 * 'probe_interval' is a number of seconds. If the interval passes once
167 * without an OpenFlow message being received from the peer, the rconn sends
168 * out an "echo request" message. If the interval passes again without a
169 * message being received, the rconn disconnects and re-connects to the peer.
170 * Setting 'probe_interval' to 0 disables this behavior.
172 * 'max_backoff' is the maximum number of seconds between attempts to connect
173 * to the peer. The actual interval starts at 1 second and doubles on each
174 * failure until it reaches 'max_backoff'. If 0 is specified, the default of
175 * 8 seconds is used. */
177 rconn_create(int probe_interval
, int max_backoff
)
179 struct rconn
*rc
= xcalloc(1, sizeof *rc
);
182 rc
->state_entered
= time_now();
185 rc
->name
= xstrdup("void");
186 rc
->reliable
= false;
188 queue_init(&rc
->txq
);
191 rc
->max_backoff
= max_backoff
? max_backoff
: 8;
192 rc
->backoff_deadline
= TIME_MIN
;
193 rc
->last_received
= time_now();
194 rc
->last_connected
= time_now();
197 rc
->packets_sent
= 0;
199 rc
->probably_admitted
= false;
200 rc
->last_admitted
= time_now();
202 rc
->packets_received
= 0;
203 rc
->n_attempted_connections
= 0;
204 rc
->n_successful_connections
= 0;
205 rc
->creation_time
= time_now();
206 rc
->total_time_connected
= 0;
208 rc
->questionable_connectivity
= false;
209 rc
->last_questioned
= time_now();
211 rconn_set_probe_interval(rc
, probe_interval
);
219 rconn_set_max_backoff(struct rconn
*rc
, int max_backoff
)
221 rc
->max_backoff
= MAX(1, max_backoff
);
222 if (rc
->state
== S_BACKOFF
&& rc
->backoff
> max_backoff
) {
223 rc
->backoff
= max_backoff
;
224 if (rc
->backoff_deadline
> time_now() + max_backoff
) {
225 rc
->backoff_deadline
= time_now() + max_backoff
;
231 rconn_get_max_backoff(const struct rconn
*rc
)
233 return rc
->max_backoff
;
237 rconn_set_probe_interval(struct rconn
*rc
, int probe_interval
)
239 rc
->probe_interval
= probe_interval
? MAX(5, probe_interval
) : 0;
243 rconn_get_probe_interval(const struct rconn
*rc
)
245 return rc
->probe_interval
;
249 rconn_connect(struct rconn
*rc
, const char *name
)
251 rconn_disconnect(rc
);
252 set_vconn_name(rc
, name
);
254 return reconnect(rc
);
258 rconn_connect_unreliably(struct rconn
*rc
,
259 const char *name
, struct vconn
*vconn
)
261 assert(vconn
!= NULL
);
262 rconn_disconnect(rc
);
263 set_vconn_name(rc
, name
);
264 rc
->reliable
= false;
266 rc
->last_connected
= time_now();
267 state_transition(rc
, S_ACTIVE
);
270 /* If 'rc' is connected, forces it to drop the connection and reconnect. */
272 rconn_reconnect(struct rconn
*rc
)
274 if (rc
->state
& (S_ACTIVE
| S_IDLE
)) {
280 rconn_disconnect(struct rconn
*rc
)
282 if (rc
->state
!= S_VOID
) {
284 vconn_close(rc
->vconn
);
287 set_vconn_name(rc
, "void");
288 rc
->reliable
= false;
291 rc
->backoff_deadline
= TIME_MIN
;
293 state_transition(rc
, S_VOID
);
297 /* Disconnects 'rc' and frees the underlying storage. */
299 rconn_destroy(struct rconn
*rc
)
305 vconn_close(rc
->vconn
);
307 queue_destroy(&rc
->txq
);
308 for (i
= 0; i
< rc
->n_monitors
; i
++) {
309 vconn_close(rc
->monitors
[i
]);
316 timeout_VOID(const struct rconn
*rc UNUSED
)
322 run_VOID(struct rconn
*rc UNUSED
)
328 reconnect(struct rconn
*rc
)
332 VLOG_INFO("%s: connecting...", rc
->name
);
333 rc
->n_attempted_connections
++;
334 retval
= vconn_open(rc
->name
, OFP_VERSION
, &rc
->vconn
);
336 rc
->remote_ip
= vconn_get_remote_ip(rc
->vconn
);
337 rc
->local_ip
= vconn_get_local_ip(rc
->vconn
);
338 rc
->remote_port
= vconn_get_remote_port(rc
->vconn
);
339 rc
->backoff_deadline
= time_now() + rc
->backoff
;
340 state_transition(rc
, S_CONNECTING
);
342 VLOG_WARN("%s: connection failed (%s)", rc
->name
, strerror(retval
));
343 rc
->backoff_deadline
= TIME_MAX
; /* Prevent resetting backoff. */
350 timeout_BACKOFF(const struct rconn
*rc
)
356 run_BACKOFF(struct rconn
*rc
)
364 timeout_CONNECTING(const struct rconn
*rc
)
366 return MAX(1, rc
->backoff
);
370 run_CONNECTING(struct rconn
*rc
)
372 int retval
= vconn_connect(rc
->vconn
);
374 VLOG_INFO("%s: connected", rc
->name
);
375 rc
->n_successful_connections
++;
376 state_transition(rc
, S_ACTIVE
);
377 rc
->last_connected
= rc
->state_entered
;
378 } else if (retval
!= EAGAIN
) {
379 VLOG_INFO("%s: connection failed (%s)", rc
->name
, strerror(retval
));
380 disconnect(rc
, retval
);
381 } else if (timed_out(rc
)) {
382 VLOG_INFO("%s: connection timed out", rc
->name
);
383 rc
->backoff_deadline
= TIME_MAX
; /* Prevent resetting backoff. */
389 do_tx_work(struct rconn
*rc
)
394 while (rc
->txq
.n
> 0) {
395 int error
= try_send(rc
);
401 poll_immediate_wake();
406 timeout_ACTIVE(const struct rconn
*rc
)
408 if (rc
->probe_interval
) {
409 unsigned int base
= MAX(rc
->last_received
, rc
->state_entered
);
410 unsigned int arg
= base
+ rc
->probe_interval
- rc
->state_entered
;
417 run_ACTIVE(struct rconn
*rc
)
420 unsigned int base
= MAX(rc
->last_received
, rc
->state_entered
);
421 VLOG_DBG("%s: idle %u seconds, sending inactivity probe",
422 rc
->name
, (unsigned int) (time_now() - base
));
424 /* Ordering is important here: rconn_send() can transition to BACKOFF,
425 * and we don't want to transition back to IDLE if so, because then we
426 * can end up queuing a packet with vconn == NULL and then *boom*. */
427 state_transition(rc
, S_IDLE
);
428 rconn_send(rc
, make_echo_request(), NULL
);
436 timeout_IDLE(const struct rconn
*rc
)
438 return rc
->probe_interval
;
442 run_IDLE(struct rconn
*rc
)
445 question_connectivity(rc
);
446 VLOG_ERR("%s: no response to inactivity probe after %u "
447 "seconds, disconnecting",
448 rc
->name
, elapsed_in_this_state(rc
));
455 /* Performs whatever activities are necessary to maintain 'rc': if 'rc' is
456 * disconnected, attempts to (re)connect, backing off as necessary; if 'rc' is
457 * connected, attempts to send packets in the send queue, if any. */
459 rconn_run(struct rconn
*rc
)
463 old_state
= rc
->state
;
465 #define STATE(NAME, VALUE) case S_##NAME: run_##NAME(rc); break;
471 } while (rc
->state
!= old_state
);
474 /* Causes the next call to poll_block() to wake up when rconn_run() should be
477 rconn_run_wait(struct rconn
*rc
)
479 unsigned int timeo
= timeout(rc
);
480 if (timeo
!= UINT_MAX
) {
481 unsigned int expires
= sat_add(rc
->state_entered
, timeo
);
482 unsigned int remaining
= sat_sub(expires
, time_now());
483 poll_timer_wait(sat_mul(remaining
, 1000));
486 if ((rc
->state
& (S_ACTIVE
| S_IDLE
)) && rc
->txq
.n
) {
487 vconn_wait(rc
->vconn
, WAIT_SEND
);
491 /* Attempts to receive a packet from 'rc'. If successful, returns the packet;
492 * otherwise, returns a null pointer. The caller is responsible for freeing
493 * the packet (with ofpbuf_delete()). */
495 rconn_recv(struct rconn
*rc
)
497 if (rc
->state
& (S_ACTIVE
| S_IDLE
)) {
498 struct ofpbuf
*buffer
;
499 int error
= vconn_recv(rc
->vconn
, &buffer
);
501 copy_to_monitor(rc
, buffer
);
502 if (rc
->probably_admitted
|| is_admitted_msg(buffer
)
503 || time_now() - rc
->last_connected
>= 30) {
504 rc
->probably_admitted
= true;
505 rc
->last_admitted
= time_now();
507 rc
->last_received
= time_now();
508 rc
->packets_received
++;
509 if (rc
->state
== S_IDLE
) {
510 state_transition(rc
, S_ACTIVE
);
513 } else if (error
!= EAGAIN
) {
514 disconnect(rc
, error
);
520 /* Causes the next call to poll_block() to wake up when a packet may be ready
521 * to be received by vconn_recv() on 'rc'. */
523 rconn_recv_wait(struct rconn
*rc
)
526 vconn_wait(rc
->vconn
, WAIT_RECV
);
530 /* Sends 'b' on 'rc'. Returns 0 if successful (in which case 'b' is
531 * destroyed), or ENOTCONN if 'rc' is not currently connected (in which case
532 * the caller retains ownership of 'b').
534 * If 'counter' is non-null, then 'counter' will be incremented while the
535 * packet is in flight, then decremented when it has been sent (or discarded
536 * due to disconnection). Because 'b' may be sent (or discarded) before this
537 * function returns, the caller may not be able to observe any change in
540 * There is no rconn_send_wait() function: an rconn has a send queue that it
541 * takes care of sending if you call rconn_run(), which will have the side
542 * effect of waking up poll_block(). */
544 rconn_send(struct rconn
*rc
, struct ofpbuf
*b
,
545 struct rconn_packet_counter
*counter
)
547 if (rconn_is_connected(rc
)) {
548 COVERAGE_INC(rconn_queued
);
549 copy_to_monitor(rc
, b
);
550 b
->private = counter
;
552 rconn_packet_counter_inc(counter
);
554 queue_push_tail(&rc
->txq
, b
);
556 /* If the queue was empty before we added 'b', try to send some
557 * packets. (But if the queue had packets in it, it's because the
558 * vconn is backlogged and there's no point in stuffing more into it
559 * now. We'll get back to that in rconn_run().) */
560 if (rc
->txq
.n
== 1) {
569 /* Sends 'b' on 'rc'. Increments 'counter' while the packet is in flight; it
570 * will be decremented when it has been sent (or discarded due to
571 * disconnection). Returns 0 if successful, EAGAIN if 'counter->n' is already
572 * at least as large as 'queue_limit', or ENOTCONN if 'rc' is not currently
573 * connected. Regardless of return value, 'b' is destroyed.
575 * Because 'b' may be sent (or discarded) before this function returns, the
576 * caller may not be able to observe any change in 'counter'.
578 * There is no rconn_send_wait() function: an rconn has a send queue that it
579 * takes care of sending if you call rconn_run(), which will have the side
580 * effect of waking up poll_block(). */
582 rconn_send_with_limit(struct rconn
*rc
, struct ofpbuf
*b
,
583 struct rconn_packet_counter
*counter
, int queue_limit
)
586 retval
= counter
->n
>= queue_limit
? EAGAIN
: rconn_send(rc
, b
, counter
);
588 COVERAGE_INC(rconn_overflow
);
594 /* Returns the total number of packets successfully sent on the underlying
595 * vconn. A packet is not counted as sent while it is still queued in the
596 * rconn, only when it has been successfuly passed to the vconn. */
598 rconn_packets_sent(const struct rconn
*rc
)
600 return rc
->packets_sent
;
603 /* Adds 'vconn' to 'rc' as a monitoring connection, to which all messages sent
604 * and received on 'rconn' will be copied. 'rc' takes ownership of 'vconn'. */
606 rconn_add_monitor(struct rconn
*rc
, struct vconn
*vconn
)
608 if (rc
->n_monitors
< ARRAY_SIZE(rc
->monitors
)) {
609 VLOG_INFO("new monitor connection from %s", vconn_get_name(vconn
));
610 rc
->monitors
[rc
->n_monitors
++] = vconn
;
612 VLOG_DBG("too many monitor connections, discarding %s",
613 vconn_get_name(vconn
));
618 /* Returns 'rc''s name (the 'name' argument passed to rconn_new()). */
620 rconn_get_name(const struct rconn
*rc
)
625 /* Returns true if 'rconn' is connected or in the process of reconnecting,
626 * false if 'rconn' is disconnected and will not reconnect on its own. */
628 rconn_is_alive(const struct rconn
*rconn
)
630 return rconn
->state
!= S_VOID
;
633 /* Returns true if 'rconn' is connected, false otherwise. */
635 rconn_is_connected(const struct rconn
*rconn
)
637 return is_connected_state(rconn
->state
);
640 /* Returns true if 'rconn' is connected and thought to have been accepted by
641 * the peer's admission-control policy. */
643 rconn_is_admitted(const struct rconn
*rconn
)
645 return (rconn_is_connected(rconn
)
646 && rconn
->last_admitted
>= rconn
->last_connected
);
649 /* Returns 0 if 'rconn' is currently connected and considered to have been
650 * accepted by the peer's admission-control policy, otherwise the number of
651 * seconds since 'rconn' was last in such a state. */
653 rconn_failure_duration(const struct rconn
*rconn
)
655 return rconn_is_admitted(rconn
) ? 0 : time_now() - rconn
->last_admitted
;
658 /* Returns the IP address of the peer, or 0 if the peer's IP address is not
661 rconn_get_remote_ip(const struct rconn
*rconn
)
663 return rconn
->remote_ip
;
666 /* Returns the transport port of the peer, or 0 if the peer's port is not
669 rconn_get_remote_port(const struct rconn
*rconn
)
671 return rconn
->remote_port
;
674 /* Returns the IP address used to connect to the peer, or 0 if the
675 * connection is not an IP-based protocol or if its IP address is not
678 rconn_get_local_ip(const struct rconn
*rconn
)
680 return rconn
->local_ip
;
683 /* Returns the transport port used to connect to the peer, or 0 if the
684 * connection does not contain a port or if the port is not known. */
686 rconn_get_local_port(const struct rconn
*rconn
)
688 return rconn
->vconn
? vconn_get_local_port(rconn
->vconn
) : 0;
691 /* If 'rconn' can't connect to the peer, it could be for any number of reasons.
692 * Usually, one would assume it is because the peer is not running or because
693 * the network is partitioned. But it could also be because the network
694 * topology has changed, in which case the upper layer will need to reassess it
695 * (in particular, obtain a new IP address via DHCP and find the new location
696 * of the controller). When this appears that this might be the case, this
697 * function returns true. It also clears the questionability flag and prevents
698 * it from being set again for some time. */
700 rconn_is_connectivity_questionable(struct rconn
*rconn
)
702 bool questionable
= rconn
->questionable_connectivity
;
703 rconn
->questionable_connectivity
= false;
707 /* Returns the total number of packets successfully received by the underlying
710 rconn_packets_received(const struct rconn
*rc
)
712 return rc
->packets_received
;
715 /* Returns a string representing the internal state of 'rc'. The caller must
716 * not modify or free the string. */
718 rconn_get_state(const struct rconn
*rc
)
720 return state_name(rc
->state
);
723 /* Returns the number of connection attempts made by 'rc', including any
724 * ongoing attempt that has not yet succeeded or failed. */
726 rconn_get_attempted_connections(const struct rconn
*rc
)
728 return rc
->n_attempted_connections
;
731 /* Returns the number of successful connection attempts made by 'rc'. */
733 rconn_get_successful_connections(const struct rconn
*rc
)
735 return rc
->n_successful_connections
;
738 /* Returns the time at which the last successful connection was made by
741 rconn_get_last_connection(const struct rconn
*rc
)
743 return rc
->last_connected
;
746 /* Returns the time at which the last OpenFlow message was received by 'rc'.
747 * If no packets have been received on 'rc', returns the time at which 'rc'
750 rconn_get_last_received(const struct rconn
*rc
)
752 return rc
->last_received
;
755 /* Returns the time at which 'rc' was created. */
757 rconn_get_creation_time(const struct rconn
*rc
)
759 return rc
->creation_time
;
762 /* Returns the approximate number of seconds that 'rc' has been connected. */
764 rconn_get_total_time_connected(const struct rconn
*rc
)
766 return (rc
->total_time_connected
767 + (rconn_is_connected(rc
) ? elapsed_in_this_state(rc
) : 0));
770 /* Returns the current amount of backoff, in seconds. This is the amount of
771 * time after which the rconn will transition from BACKOFF to CONNECTING. */
773 rconn_get_backoff(const struct rconn
*rc
)
778 /* Returns the number of seconds spent in this state so far. */
780 rconn_get_state_elapsed(const struct rconn
*rc
)
782 return elapsed_in_this_state(rc
);
785 /* Returns 'rc''s current connection sequence number, a number that changes
786 * every time that 'rconn' connects or disconnects. */
788 rconn_get_connection_seqno(const struct rconn
*rc
)
793 struct rconn_packet_counter
*
794 rconn_packet_counter_create(void)
796 struct rconn_packet_counter
*c
= xmalloc(sizeof *c
);
803 rconn_packet_counter_destroy(struct rconn_packet_counter
*c
)
806 assert(c
->ref_cnt
> 0);
807 if (!--c
->ref_cnt
&& !c
->n
) {
814 rconn_packet_counter_inc(struct rconn_packet_counter
*c
)
820 rconn_packet_counter_dec(struct rconn_packet_counter
*c
)
823 if (!--c
->n
&& !c
->ref_cnt
) {
828 /* Set the name of the remote vconn to 'name' and clear out the cached IP
829 * address and port information, since changing the name also likely changes
832 set_vconn_name(struct rconn
*rc
, const char *name
)
835 rc
->name
= xstrdup(name
);
841 /* Tries to send a packet from 'rc''s send buffer. Returns 0 if successful,
842 * otherwise a positive errno value. */
844 try_send(struct rconn
*rc
)
847 struct ofpbuf
*next
= rc
->txq
.head
->next
;
848 struct rconn_packet_counter
*counter
= rc
->txq
.head
->private;
849 retval
= vconn_send(rc
->vconn
, rc
->txq
.head
);
851 if (retval
!= EAGAIN
) {
852 disconnect(rc
, retval
);
856 COVERAGE_INC(rconn_sent
);
859 rconn_packet_counter_dec(counter
);
861 queue_advance_head(&rc
->txq
, next
);
865 /* Disconnects 'rc'. 'error' is used only for logging purposes. If it is
866 * nonzero, then it should be EOF to indicate the connection was closed by the
867 * peer in a normal fashion or a positive errno value. */
869 disconnect(struct rconn
*rc
, int error
)
872 time_t now
= time_now();
874 if (rc
->state
& (S_CONNECTING
| S_ACTIVE
| S_IDLE
)) {
876 VLOG_WARN("%s: connection dropped (%s)",
877 rc
->name
, strerror(error
));
878 } else if (error
== EOF
) {
880 VLOG_INFO("%s: connection closed by peer", rc
->name
);
883 VLOG_INFO("%s: connection dropped", rc
->name
);
885 vconn_close(rc
->vconn
);
890 if (now
>= rc
->backoff_deadline
) {
893 rc
->backoff
= MIN(rc
->max_backoff
, MAX(1, 2 * rc
->backoff
));
894 VLOG_INFO("%s: waiting %d seconds before reconnect\n",
895 rc
->name
, rc
->backoff
);
897 rc
->backoff_deadline
= now
+ rc
->backoff
;
898 state_transition(rc
, S_BACKOFF
);
899 if (now
- rc
->last_connected
> 60) {
900 question_connectivity(rc
);
903 rconn_disconnect(rc
);
907 /* Drops all the packets from 'rc''s send queue and decrements their queue
910 flush_queue(struct rconn
*rc
)
915 while (rc
->txq
.n
> 0) {
916 struct ofpbuf
*b
= queue_pop_head(&rc
->txq
);
917 struct rconn_packet_counter
*counter
= b
->private;
919 rconn_packet_counter_dec(counter
);
921 COVERAGE_INC(rconn_discarded
);
924 poll_immediate_wake();
928 elapsed_in_this_state(const struct rconn
*rc
)
930 return time_now() - rc
->state_entered
;
934 timeout(const struct rconn
*rc
)
937 #define STATE(NAME, VALUE) case S_##NAME: return timeout_##NAME(rc);
946 timed_out(const struct rconn
*rc
)
948 return time_now() >= sat_add(rc
->state_entered
, timeout(rc
));
952 state_transition(struct rconn
*rc
, enum state state
)
954 rc
->seqno
+= (rc
->state
== S_ACTIVE
) != (state
== S_ACTIVE
);
955 if (is_connected_state(state
) && !is_connected_state(rc
->state
)) {
956 rc
->probably_admitted
= false;
958 if (rconn_is_connected(rc
)) {
959 rc
->total_time_connected
+= elapsed_in_this_state(rc
);
961 VLOG_DBG("%s: entering %s", rc
->name
, state_name(state
));
963 rc
->state_entered
= time_now();
967 question_connectivity(struct rconn
*rc
)
969 time_t now
= time_now();
970 if (now
- rc
->last_questioned
> 60) {
971 rc
->questionable_connectivity
= true;
972 rc
->last_questioned
= now
;
977 copy_to_monitor(struct rconn
*rc
, const struct ofpbuf
*b
)
979 struct ofpbuf
*clone
= NULL
;
983 for (i
= 0; i
< rc
->n_monitors
; ) {
984 struct vconn
*vconn
= rc
->monitors
[i
];
987 clone
= ofpbuf_clone(b
);
989 retval
= vconn_send(vconn
, clone
);
992 } else if (retval
!= EAGAIN
) {
993 VLOG_DBG("%s: closing monitor connection to %s: %s",
994 rconn_get_name(rc
), vconn_get_name(vconn
),
996 rc
->monitors
[i
] = rc
->monitors
[--rc
->n_monitors
];
1001 ofpbuf_delete(clone
);
1005 is_connected_state(enum state state
)
1007 return (state
& (S_ACTIVE
| S_IDLE
)) != 0;
1011 is_admitted_msg(const struct ofpbuf
*b
)
1013 struct ofp_header
*oh
= b
->data
;
1014 uint8_t type
= oh
->type
;
1016 && (1u << type
) & ((1u << OFPT_HELLO
) |
1017 (1u << OFPT_ERROR
) |
1018 (1u << OFPT_ECHO_REQUEST
) |
1019 (1u << OFPT_ECHO_REPLY
) |
1020 (1u << OFPT_VENDOR
) |
1021 (1u << OFPT_FEATURES_REQUEST
) |
1022 (1u << OFPT_FEATURES_REPLY
) |
1023 (1u << OFPT_GET_CONFIG_REQUEST
) |
1024 (1u << OFPT_GET_CONFIG_REPLY
) |
1025 (1u << OFPT_SET_CONFIG
)));