/*
- * Copyright (c) 2008, 2009, 2010 Nicira Networks.
+ * Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
VLOG_DEFINE_THIS_MODULE(rconn);
+COVERAGE_DEFINE(rconn_discarded);
+COVERAGE_DEFINE(rconn_overflow);
+COVERAGE_DEFINE(rconn_queued);
+COVERAGE_DEFINE(rconn_sent);
+
#define STATES \
STATE(VOID, 1 << 0) \
STATE(BACKOFF, 1 << 1) \
char *target; /* vconn name, passed to vconn_open(). */
bool reliable;
- struct ovs_queue txq;
+ struct list txq; /* Contains "struct ofpbuf"s. */
int backoff;
int max_backoff;
time_t backoff_deadline;
time_t last_received;
time_t last_connected;
+ time_t last_disconnected;
unsigned int packets_sent;
unsigned int seqno;
int last_error;
time_t creation_time;
unsigned long int total_time_connected;
- /* If we can't connect to the peer, it could be for any number of reasons.
- * Usually, one would assume it is because the peer is not running or
- * because the network is partitioned. But it could also be because the
- * network topology has changed, in which case the upper layer will need to
- * reassess it (in particular, obtain a new IP address via DHCP and find
- * the new location of the controller). We set this flag when we suspect
- * that this could be the case. */
- bool questionable_connectivity;
- time_t last_questioned;
-
/* Throughout this file, "probe" is shorthand for "inactivity probe".
* When nothing has been received from the peer for a while, we send out
* an echo request as an inactivity probe packet. We should receive back
*
* We don't cache the local port, because that changes from one connection
* attempt to the next. */
- uint32_t local_ip, remote_ip;
- uint16_t remote_port;
+ ovs_be32 local_ip, remote_ip;
+ ovs_be16 remote_port;
/* Messages sent or received are copied to the monitor connections. */
#define MAX_MONITORS 8
static void report_error(struct rconn *, int error);
static void disconnect(struct rconn *, int error);
static void flush_queue(struct rconn *);
-static void question_connectivity(struct rconn *);
static void copy_to_monitor(struct rconn *, const struct ofpbuf *);
static bool is_connected_state(enum state);
static bool is_admitted_msg(const struct ofpbuf *);
rc->target = xstrdup("void");
rc->reliable = false;
- queue_init(&rc->txq);
+ list_init(&rc->txq);
rc->backoff = 0;
rc->max_backoff = max_backoff ? max_backoff : 8;
rc->backoff_deadline = TIME_MIN;
rc->last_received = time_now();
- rc->last_connected = time_now();
+ rc->last_connected = TIME_MIN;
+ rc->last_disconnected = TIME_MIN;
rc->seqno = 0;
rc->packets_sent = 0;
rc->creation_time = time_now();
rc->total_time_connected = 0;
- rc->questionable_connectivity = false;
- rc->last_questioned = time_now();
-
rconn_set_probe_interval(rc, probe_interval);
rc->n_monitors = 0;
free(rc->target);
vconn_close(rc->vconn);
flush_queue(rc);
- queue_destroy(&rc->txq);
+ ofpbuf_list_delete(&rc->txq);
for (i = 0; i < rc->n_monitors; i++) {
vconn_close(rc->monitors[i]);
}
static void
do_tx_work(struct rconn *rc)
{
- if (!rc->txq.n) {
+ if (list_is_empty(&rc->txq)) {
return;
}
- while (rc->txq.n > 0) {
+ while (!list_is_empty(&rc->txq)) {
int error = try_send(rc);
if (error) {
break;
}
}
- if (!rc->txq.n) {
+ if (list_is_empty(&rc->txq)) {
poll_immediate_wake();
}
}
run_IDLE(struct rconn *rc)
{
if (timed_out(rc)) {
- question_connectivity(rc);
VLOG_ERR("%s: no response to inactivity probe after %u "
"seconds, disconnecting",
rc->name, elapsed_in_this_state(rc));
if (rc->vconn) {
vconn_run_wait(rc->vconn);
+ if ((rc->state & (S_ACTIVE | S_IDLE)) && !list_is_empty(&rc->txq)) {
+ vconn_wait(rc->vconn, WAIT_SEND);
+ }
}
for (i = 0; i < rc->n_monitors; i++) {
vconn_run_wait(rc->monitors[i]);
long long int expires = sat_add(rc->state_entered, timeo);
poll_timer_wait_until(expires * 1000);
}
-
- if ((rc->state & (S_ACTIVE | S_IDLE)) && rc->txq.n) {
- vconn_wait(rc->vconn, WAIT_SEND);
- }
}
/* Attempts to receive a packet from 'rc'. If successful, returns the packet;
if (counter) {
rconn_packet_counter_inc(counter);
}
- queue_push_tail(&rc->txq, b);
+ list_push_back(&rc->txq, &b->list_node);
/* If the queue was empty before we added 'b', try to send some
* packets. (But if the queue had packets in it, it's because the
* vconn is backlogged and there's no point in stuffing more into it
* now. We'll get back to that in rconn_run().) */
- if (rc->txq.n == 1) {
+ if (rc->txq.next == &b->list_node) {
try_send(rc);
}
return 0;
/* Returns the IP address of the peer, or 0 if the peer's IP address is not
* known. */
-uint32_t
+ovs_be32
rconn_get_remote_ip(const struct rconn *rconn)
{
return rconn->remote_ip;
/* Returns the transport port of the peer, or 0 if the peer's port is not
* known. */
-uint16_t
+ovs_be16
rconn_get_remote_port(const struct rconn *rconn)
{
return rconn->remote_port;
/* Returns the IP address used to connect to the peer, or 0 if the
* connection is not an IP-based protocol or if its IP address is not
* known. */
-uint32_t
+ovs_be32
rconn_get_local_ip(const struct rconn *rconn)
{
return rconn->local_ip;
/* Returns the transport port used to connect to the peer, or 0 if the
* connection does not contain a port or if the port is not known. */
-uint16_t
+ovs_be16
rconn_get_local_port(const struct rconn *rconn)
{
return rconn->vconn ? vconn_get_local_port(rconn->vconn) : 0;
}
-/* If 'rconn' can't connect to the peer, it could be for any number of reasons.
- * Usually, one would assume it is because the peer is not running or because
- * the network is partitioned. But it could also be because the network
- * topology has changed, in which case the upper layer will need to reassess it
- * (in particular, obtain a new IP address via DHCP and find the new location
- * of the controller). When this appears that this might be the case, this
- * function returns true. It also clears the questionability flag and prevents
- * it from being set again for some time. */
-bool
-rconn_is_connectivity_questionable(struct rconn *rconn)
-{
- bool questionable = rconn->questionable_connectivity;
- rconn->questionable_connectivity = false;
- return questionable;
-}
-
/* Returns the total number of packets successfully received by the underlying
* vconn. */
unsigned int
}
/* Returns the time at which the last successful connection was made by
- * 'rc'. */
+ * 'rc'. Returns TIME_MIN if never connected. */
time_t
rconn_get_last_connection(const struct rconn *rc)
{
return rc->last_connected;
}
+/* Returns the time at which 'rc' was last disconnected. Returns TIME_MIN
+ * if never disconnected. */
+time_t
+rconn_get_last_disconnect(const struct rconn *rc)
+{
+ return rc->last_disconnected;
+}
+
/* Returns the time at which the last OpenFlow message was received by 'rc'.
* If no packets have been received on 'rc', returns the time at which 'rc'
* was created. */
static int
try_send(struct rconn *rc)
{
- int retval = 0;
- struct ofpbuf *next = rc->txq.head->next;
- struct rconn_packet_counter *counter = rc->txq.head->private_p;
- retval = vconn_send(rc->vconn, rc->txq.head);
+ struct ofpbuf *msg = ofpbuf_from_list(rc->txq.next);
+ struct rconn_packet_counter *counter = msg->private_p;
+ int retval;
+
+ /* Eagerly remove 'msg' from the txq. We can't remove it from the list
+ * after sending, if sending is successful, because it is then owned by the
+ * vconn, which might have freed it already. */
+ list_remove(&msg->list_node);
+
+ retval = vconn_send(rc->vconn, msg);
if (retval) {
+ list_push_front(&rc->txq, &msg->list_node);
if (retval != EAGAIN) {
report_error(rc, retval);
disconnect(rc, retval);
if (counter) {
rconn_packet_counter_dec(counter);
}
- queue_advance_head(&rc->txq, next);
return 0;
}
time_t now = time_now();
if (rc->state & (S_CONNECTING | S_ACTIVE | S_IDLE)) {
+ rc->last_disconnected = now;
vconn_close(rc->vconn);
rc->vconn = NULL;
flush_queue(rc);
}
rc->backoff_deadline = now + rc->backoff;
state_transition(rc, S_BACKOFF);
- if (now - rc->last_connected > 60) {
- question_connectivity(rc);
- }
} else {
+ rc->last_disconnected = time_now();
rconn_disconnect(rc);
}
}
static void
flush_queue(struct rconn *rc)
{
- if (!rc->txq.n) {
+ if (list_is_empty(&rc->txq)) {
return;
}
- while (rc->txq.n > 0) {
- struct ofpbuf *b = queue_pop_head(&rc->txq);
+ while (!list_is_empty(&rc->txq)) {
+ struct ofpbuf *b = ofpbuf_from_list(list_pop_front(&rc->txq));
struct rconn_packet_counter *counter = b->private_p;
if (counter) {
rconn_packet_counter_dec(counter);
rc->state_entered = time_now();
}
-static void
-question_connectivity(struct rconn *rc)
-{
- time_t now = time_now();
- if (now - rc->last_questioned > 60) {
- rc->questionable_connectivity = true;
- rc->last_questioned = now;
- }
-}
-
static void
copy_to_monitor(struct rconn *rc, const struct ofpbuf *b)
{
git://git.onelab.eu / sliver-openvswitch.git / blobdiff