mirror of
https://github.com/openvswitch/ovs
synced 2025-08-22 09:58:01 +00:00
ca6ba70092
struct list is a common name and can't be used in public headers. Signed-off-by: Thomas Graf <tgraf@noironetworks.com> Acked-by: Ben Pfaff <blp@nicira.com>
1455 lines
42 KiB
C
1455 lines
42 KiB
C
/*
|
||
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014 Nicira, Inc.
|
||
*
|
||
* Licensed under the Apache License, Version 2.0 (the "License");
|
||
* you may not use this file except in compliance with the License.
|
||
* You may obtain a copy of the License at:
|
||
*
|
||
* http://www.apache.org/licenses/LICENSE-2.0
|
||
*
|
||
* Unless required by applicable law or agreed to in writing, software
|
||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
* See the License for the specific language governing permissions and
|
||
* limitations under the License.
|
||
*/
|
||
|
||
#include <config.h>
|
||
#include "rconn.h"
|
||
#include <errno.h>
|
||
#include <limits.h>
|
||
#include <stdlib.h>
|
||
#include <string.h>
|
||
#include "coverage.h"
|
||
#include "ofp-msgs.h"
|
||
#include "ofp-util.h"
|
||
#include "ofpbuf.h"
|
||
#include "openflow/openflow.h"
|
||
#include "poll-loop.h"
|
||
#include "sat-math.h"
|
||
#include "timeval.h"
|
||
#include "util.h"
|
||
#include "vconn.h"
|
||
#include "vlog.h"
|
||
|
||
VLOG_DEFINE_THIS_MODULE(rconn);
|
||
|
||
COVERAGE_DEFINE(rconn_discarded);
|
||
COVERAGE_DEFINE(rconn_overflow);
|
||
COVERAGE_DEFINE(rconn_queued);
|
||
COVERAGE_DEFINE(rconn_sent);
|
||
|
||
/* The connection states have the following meanings:
|
||
*
|
||
* - S_VOID: No connection information is configured.
|
||
*
|
||
* - S_BACKOFF: Waiting for a period of time before reconnecting.
|
||
*
|
||
* - S_CONNECTING: A connection attempt is in progress and has not yet
|
||
* succeeded or failed.
|
||
*
|
||
* - S_ACTIVE: A connection has been established and appears to be healthy.
|
||
*
|
||
* - S_IDLE: A connection has been established but has been idle for some
|
||
* time. An echo request has been sent, but no reply has yet been
|
||
* received.
|
||
*
|
||
* - S_DISCONNECTED: An unreliable connection has disconnected and cannot be
|
||
* automatically retried.
|
||
*/
|
||
#define STATES \
|
||
STATE(VOID, 1 << 0) \
|
||
STATE(BACKOFF, 1 << 1) \
|
||
STATE(CONNECTING, 1 << 2) \
|
||
STATE(ACTIVE, 1 << 3) \
|
||
STATE(IDLE, 1 << 4) \
|
||
STATE(DISCONNECTED, 1 << 5)
|
||
enum state {
|
||
#define STATE(NAME, VALUE) S_##NAME = VALUE,
|
||
STATES
|
||
#undef STATE
|
||
};
|
||
|
||
static const char *
|
||
state_name(enum state state)
|
||
{
|
||
switch (state) {
|
||
#define STATE(NAME, VALUE) case S_##NAME: return #NAME;
|
||
STATES
|
||
#undef STATE
|
||
}
|
||
return "***ERROR***";
|
||
}
|
||
|
||
/* A reliable connection to an OpenFlow switch or controller.
|
||
*
|
||
* See the large comment in rconn.h for more information. */
|
||
struct rconn {
|
||
struct ovs_mutex mutex;
|
||
|
||
enum state state;
|
||
time_t state_entered;
|
||
|
||
struct vconn *vconn;
|
||
char *name; /* Human-readable descriptive name. */
|
||
char *target; /* vconn name, passed to vconn_open(). */
|
||
bool reliable;
|
||
|
||
struct ovs_list txq; /* Contains "struct ofpbuf"s. */
|
||
|
||
int backoff;
|
||
int max_backoff;
|
||
time_t backoff_deadline;
|
||
time_t last_connected;
|
||
time_t last_disconnected;
|
||
unsigned int packets_sent;
|
||
unsigned int seqno;
|
||
int last_error;
|
||
|
||
/* In S_ACTIVE and S_IDLE, probably_admitted reports whether we believe
|
||
* that the peer has made a (positive) admission control decision on our
|
||
* connection. If we have not yet been (probably) admitted, then the
|
||
* connection does not reset the timer used for deciding whether the switch
|
||
* should go into fail-open mode.
|
||
*
|
||
* last_admitted reports the last time we believe such a positive admission
|
||
* control decision was made. */
|
||
bool probably_admitted;
|
||
time_t last_admitted;
|
||
|
||
/* These values are simply for statistics reporting, not used directly by
|
||
* anything internal to the rconn (or ofproto for that matter). */
|
||
unsigned int packets_received;
|
||
unsigned int n_attempted_connections, n_successful_connections;
|
||
time_t creation_time;
|
||
unsigned long int total_time_connected;
|
||
|
||
/* Throughout this file, "probe" is shorthand for "inactivity probe". When
|
||
* no activity has been observed from the peer for a while, we send out an
|
||
* echo request as an inactivity probe packet. We should receive back a
|
||
* response.
|
||
*
|
||
* "Activity" is defined as either receiving an OpenFlow message from the
|
||
* peer or successfully sending a message that had been in 'txq'. */
|
||
int probe_interval; /* Secs of inactivity before sending probe. */
|
||
time_t last_activity; /* Last time we saw some activity. */
|
||
|
||
uint8_t dscp;
|
||
|
||
/* Messages sent or received are copied to the monitor connections. */
|
||
#define MAXIMUM_MONITORS 8
|
||
struct vconn *monitors[MAXIMUM_MONITORS];
|
||
size_t n_monitors;
|
||
|
||
uint32_t allowed_versions;
|
||
};
|
||
|
||
uint32_t rconn_get_allowed_versions(const struct rconn *rconn)
|
||
{
|
||
return rconn->allowed_versions;
|
||
}
|
||
|
||
static unsigned int elapsed_in_this_state(const struct rconn *rc)
|
||
OVS_REQUIRES(rc->mutex);
|
||
static unsigned int timeout(const struct rconn *rc) OVS_REQUIRES(rc->mutex);
|
||
static bool timed_out(const struct rconn *rc) OVS_REQUIRES(rc->mutex);
|
||
static void state_transition(struct rconn *rc, enum state)
|
||
OVS_REQUIRES(rc->mutex);
|
||
static void rconn_set_target__(struct rconn *rc,
|
||
const char *target, const char *name)
|
||
OVS_REQUIRES(rc->mutex);
|
||
static int rconn_send__(struct rconn *rc, struct ofpbuf *,
|
||
struct rconn_packet_counter *)
|
||
OVS_REQUIRES(rc->mutex);
|
||
static int try_send(struct rconn *rc) OVS_REQUIRES(rc->mutex);
|
||
static void reconnect(struct rconn *rc) OVS_REQUIRES(rc->mutex);
|
||
static void report_error(struct rconn *rc, int error) OVS_REQUIRES(rc->mutex);
|
||
static void rconn_disconnect__(struct rconn *rc) OVS_REQUIRES(rc->mutex);
|
||
static void disconnect(struct rconn *rc, int error) OVS_REQUIRES(rc->mutex);
|
||
static void flush_queue(struct rconn *rc) OVS_REQUIRES(rc->mutex);
|
||
static void close_monitor(struct rconn *rc, size_t idx, int retval)
|
||
OVS_REQUIRES(rc->mutex);
|
||
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 *);
|
||
static bool rconn_logging_connection_attempts__(const struct rconn *rc)
|
||
OVS_REQUIRES(rc->mutex);
|
||
static int rconn_get_version__(const struct rconn *rconn)
|
||
OVS_REQUIRES(rconn->mutex);
|
||
|
||
/* The following prototypes duplicate those in rconn.h, but there we weren't
|
||
* able to add the OVS_EXCLUDED annotations because the definition of struct
|
||
* rconn was not visible. */
|
||
|
||
void rconn_set_max_backoff(struct rconn *rc, int max_backoff)
|
||
OVS_EXCLUDED(rc->mutex);
|
||
void rconn_connect(struct rconn *rc, const char *target, const char *name)
|
||
OVS_EXCLUDED(rc->mutex);
|
||
void rconn_connect_unreliably(struct rconn *rc,
|
||
struct vconn *vconn, const char *name)
|
||
OVS_EXCLUDED(rc->mutex);
|
||
void rconn_reconnect(struct rconn *rc) OVS_EXCLUDED(rc->mutex);
|
||
void rconn_disconnect(struct rconn *rc) OVS_EXCLUDED(rc->mutex);
|
||
void rconn_run(struct rconn *rc) OVS_EXCLUDED(rc->mutex);
|
||
void rconn_run_wait(struct rconn *rc) OVS_EXCLUDED(rc->mutex);
|
||
struct ofpbuf *rconn_recv(struct rconn *rc) OVS_EXCLUDED(rc->mutex);
|
||
void rconn_recv_wait(struct rconn *rc) OVS_EXCLUDED(rc->mutex);
|
||
int rconn_send(struct rconn *rc, struct ofpbuf *b,
|
||
struct rconn_packet_counter *counter)
|
||
OVS_EXCLUDED(rc->mutex);
|
||
int rconn_send_with_limit(struct rconn *rc, struct ofpbuf *b,
|
||
struct rconn_packet_counter *counter,
|
||
int queue_limit)
|
||
OVS_EXCLUDED(rc->mutex);
|
||
void rconn_add_monitor(struct rconn *rc, struct vconn *vconn)
|
||
OVS_EXCLUDED(rc->mutex);
|
||
void rconn_set_name(struct rconn *rc, const char *new_name)
|
||
OVS_EXCLUDED(rc->mutex);
|
||
bool rconn_is_admitted(const struct rconn *rconn) OVS_EXCLUDED(rconn->mutex);
|
||
int rconn_failure_duration(const struct rconn *rconn)
|
||
OVS_EXCLUDED(rconn->mutex);
|
||
ovs_be16 rconn_get_local_port(const struct rconn *rconn)
|
||
OVS_EXCLUDED(rconn->mutex);
|
||
int rconn_get_version(const struct rconn *rconn) OVS_EXCLUDED(rconn->mutex);
|
||
unsigned int rconn_count_txqlen(const struct rconn *rc)
|
||
OVS_EXCLUDED(rc->mutex);
|
||
|
||
|
||
/* Creates and returns a new rconn.
|
||
*
|
||
* 'probe_interval' is a number of seconds. If the interval passes once
|
||
* without an OpenFlow message being received from the peer, the rconn sends
|
||
* out an "echo request" message. If the interval passes again without a
|
||
* message being received, the rconn disconnects and re-connects to the peer.
|
||
* Setting 'probe_interval' to 0 disables this behavior.
|
||
*
|
||
* 'max_backoff' is the maximum number of seconds between attempts to connect
|
||
* to the peer. The actual interval starts at 1 second and doubles on each
|
||
* failure until it reaches 'max_backoff'. If 0 is specified, the default of
|
||
* 8 seconds is used.
|
||
*
|
||
* The new rconn is initially unconnected. Use rconn_connect() or
|
||
* rconn_connect_unreliably() to connect it.
|
||
*
|
||
* Connections made by the rconn will automatically negotiate an OpenFlow
|
||
* protocol version acceptable to both peers on the connection. The version
|
||
* negotiated will be one of those in the 'allowed_versions' bitmap: version
|
||
* 'x' is allowed if allowed_versions & (1 << x) is nonzero. (The underlying
|
||
* vconn will treat an 'allowed_versions' of 0 as OFPUTIL_DEFAULT_VERSIONS.)
|
||
*/
|
||
struct rconn *
|
||
rconn_create(int probe_interval, int max_backoff, uint8_t dscp,
|
||
uint32_t allowed_versions)
|
||
{
|
||
struct rconn *rc = xzalloc(sizeof *rc);
|
||
|
||
ovs_mutex_init(&rc->mutex);
|
||
|
||
rc->state = S_VOID;
|
||
rc->state_entered = time_now();
|
||
|
||
rc->vconn = NULL;
|
||
rc->name = xstrdup("void");
|
||
rc->target = xstrdup("void");
|
||
rc->reliable = false;
|
||
|
||
list_init(&rc->txq);
|
||
|
||
rc->backoff = 0;
|
||
rc->max_backoff = max_backoff ? max_backoff : 8;
|
||
rc->backoff_deadline = TIME_MIN;
|
||
rc->last_connected = TIME_MIN;
|
||
rc->last_disconnected = TIME_MIN;
|
||
rc->seqno = 0;
|
||
|
||
rc->packets_sent = 0;
|
||
|
||
rc->probably_admitted = false;
|
||
rc->last_admitted = time_now();
|
||
|
||
rc->packets_received = 0;
|
||
rc->n_attempted_connections = 0;
|
||
rc->n_successful_connections = 0;
|
||
rc->creation_time = time_now();
|
||
rc->total_time_connected = 0;
|
||
|
||
rc->last_activity = time_now();
|
||
|
||
rconn_set_probe_interval(rc, probe_interval);
|
||
rconn_set_dscp(rc, dscp);
|
||
|
||
rc->n_monitors = 0;
|
||
rc->allowed_versions = allowed_versions;
|
||
|
||
return rc;
|
||
}
|
||
|
||
void
|
||
rconn_set_max_backoff(struct rconn *rc, int max_backoff)
|
||
OVS_EXCLUDED(rc->mutex)
|
||
{
|
||
ovs_mutex_lock(&rc->mutex);
|
||
rc->max_backoff = MAX(1, max_backoff);
|
||
if (rc->state == S_BACKOFF && rc->backoff > max_backoff) {
|
||
rc->backoff = max_backoff;
|
||
if (rc->backoff_deadline > time_now() + max_backoff) {
|
||
rc->backoff_deadline = time_now() + max_backoff;
|
||
}
|
||
}
|
||
ovs_mutex_unlock(&rc->mutex);
|
||
}
|
||
|
||
int
|
||
rconn_get_max_backoff(const struct rconn *rc)
|
||
{
|
||
return rc->max_backoff;
|
||
}
|
||
|
||
void
|
||
rconn_set_dscp(struct rconn *rc, uint8_t dscp)
|
||
{
|
||
rc->dscp = dscp;
|
||
}
|
||
|
||
uint8_t
|
||
rconn_get_dscp(const struct rconn *rc)
|
||
{
|
||
return rc->dscp;
|
||
}
|
||
|
||
void
|
||
rconn_set_probe_interval(struct rconn *rc, int probe_interval)
|
||
{
|
||
rc->probe_interval = probe_interval ? MAX(5, probe_interval) : 0;
|
||
}
|
||
|
||
int
|
||
rconn_get_probe_interval(const struct rconn *rc)
|
||
{
|
||
return rc->probe_interval;
|
||
}
|
||
|
||
/* Drops any existing connection on 'rc', then sets up 'rc' to connect to
|
||
* 'target' and reconnect as needed. 'target' should be a remote OpenFlow
|
||
* target in a form acceptable to vconn_open().
|
||
*
|
||
* If 'name' is nonnull, then it is used in log messages in place of 'target'.
|
||
* It should presumably give more information to a human reader than 'target',
|
||
* but it need not be acceptable to vconn_open(). */
|
||
void
|
||
rconn_connect(struct rconn *rc, const char *target, const char *name)
|
||
OVS_EXCLUDED(rc->mutex)
|
||
{
|
||
ovs_mutex_lock(&rc->mutex);
|
||
rconn_disconnect__(rc);
|
||
rconn_set_target__(rc, target, name);
|
||
rc->reliable = true;
|
||
reconnect(rc);
|
||
ovs_mutex_unlock(&rc->mutex);
|
||
}
|
||
|
||
/* Drops any existing connection on 'rc', then configures 'rc' to use
|
||
* 'vconn'. If the connection on 'vconn' drops, 'rc' will not reconnect on it
|
||
* own.
|
||
*
|
||
* By default, the target obtained from vconn_get_name(vconn) is used in log
|
||
* messages. If 'name' is nonnull, then it is used instead. It should
|
||
* presumably give more information to a human reader than the target, but it
|
||
* need not be acceptable to vconn_open(). */
|
||
void
|
||
rconn_connect_unreliably(struct rconn *rc,
|
||
struct vconn *vconn, const char *name)
|
||
OVS_EXCLUDED(rc->mutex)
|
||
{
|
||
ovs_assert(vconn != NULL);
|
||
|
||
ovs_mutex_lock(&rc->mutex);
|
||
rconn_disconnect__(rc);
|
||
rconn_set_target__(rc, vconn_get_name(vconn), name);
|
||
rc->reliable = false;
|
||
rc->vconn = vconn;
|
||
rc->last_connected = time_now();
|
||
state_transition(rc, S_ACTIVE);
|
||
ovs_mutex_unlock(&rc->mutex);
|
||
}
|
||
|
||
/* If 'rc' is connected, forces it to drop the connection and reconnect. */
|
||
void
|
||
rconn_reconnect(struct rconn *rc)
|
||
OVS_EXCLUDED(rc->mutex)
|
||
{
|
||
ovs_mutex_lock(&rc->mutex);
|
||
if (rc->state & (S_ACTIVE | S_IDLE)) {
|
||
VLOG_INFO("%s: disconnecting", rc->name);
|
||
disconnect(rc, 0);
|
||
}
|
||
ovs_mutex_unlock(&rc->mutex);
|
||
}
|
||
|
||
static void
|
||
rconn_disconnect__(struct rconn *rc)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
if (rc->state != S_VOID) {
|
||
if (rc->vconn) {
|
||
vconn_close(rc->vconn);
|
||
rc->vconn = NULL;
|
||
}
|
||
rconn_set_target__(rc, "void", NULL);
|
||
rc->reliable = false;
|
||
|
||
rc->backoff = 0;
|
||
rc->backoff_deadline = TIME_MIN;
|
||
|
||
state_transition(rc, S_VOID);
|
||
}
|
||
}
|
||
|
||
void
|
||
rconn_disconnect(struct rconn *rc)
|
||
OVS_EXCLUDED(rc->mutex)
|
||
{
|
||
ovs_mutex_lock(&rc->mutex);
|
||
rconn_disconnect__(rc);
|
||
ovs_mutex_unlock(&rc->mutex);
|
||
}
|
||
|
||
/* Disconnects 'rc' and frees the underlying storage. */
|
||
void
|
||
rconn_destroy(struct rconn *rc)
|
||
{
|
||
if (rc) {
|
||
size_t i;
|
||
|
||
ovs_mutex_lock(&rc->mutex);
|
||
free(rc->name);
|
||
free(rc->target);
|
||
vconn_close(rc->vconn);
|
||
flush_queue(rc);
|
||
ofpbuf_list_delete(&rc->txq);
|
||
for (i = 0; i < rc->n_monitors; i++) {
|
||
vconn_close(rc->monitors[i]);
|
||
}
|
||
ovs_mutex_unlock(&rc->mutex);
|
||
ovs_mutex_destroy(&rc->mutex);
|
||
|
||
free(rc);
|
||
}
|
||
}
|
||
|
||
static unsigned int
|
||
timeout_VOID(const struct rconn *rc OVS_UNUSED)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
return UINT_MAX;
|
||
}
|
||
|
||
static void
|
||
run_VOID(struct rconn *rc OVS_UNUSED)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
/* Nothing to do. */
|
||
}
|
||
|
||
static void
|
||
reconnect(struct rconn *rc)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
int retval;
|
||
|
||
if (rconn_logging_connection_attempts__(rc)) {
|
||
VLOG_INFO("%s: connecting...", rc->name);
|
||
}
|
||
rc->n_attempted_connections++;
|
||
retval = vconn_open(rc->target, rc->allowed_versions, rc->dscp,
|
||
&rc->vconn);
|
||
if (!retval) {
|
||
rc->backoff_deadline = time_now() + rc->backoff;
|
||
state_transition(rc, S_CONNECTING);
|
||
} else {
|
||
VLOG_WARN("%s: connection failed (%s)",
|
||
rc->name, ovs_strerror(retval));
|
||
rc->backoff_deadline = TIME_MAX; /* Prevent resetting backoff. */
|
||
disconnect(rc, retval);
|
||
}
|
||
}
|
||
|
||
static unsigned int
|
||
timeout_BACKOFF(const struct rconn *rc)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
return rc->backoff;
|
||
}
|
||
|
||
static void
|
||
run_BACKOFF(struct rconn *rc)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
if (timed_out(rc)) {
|
||
reconnect(rc);
|
||
}
|
||
}
|
||
|
||
static unsigned int
|
||
timeout_CONNECTING(const struct rconn *rc)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
return MAX(1, rc->backoff);
|
||
}
|
||
|
||
static void
|
||
run_CONNECTING(struct rconn *rc)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
int retval = vconn_connect(rc->vconn);
|
||
if (!retval) {
|
||
VLOG_INFO("%s: connected", rc->name);
|
||
rc->n_successful_connections++;
|
||
state_transition(rc, S_ACTIVE);
|
||
rc->last_connected = rc->state_entered;
|
||
} else if (retval != EAGAIN) {
|
||
if (rconn_logging_connection_attempts__(rc)) {
|
||
VLOG_INFO("%s: connection failed (%s)",
|
||
rc->name, ovs_strerror(retval));
|
||
}
|
||
disconnect(rc, retval);
|
||
} else if (timed_out(rc)) {
|
||
if (rconn_logging_connection_attempts__(rc)) {
|
||
VLOG_INFO("%s: connection timed out", rc->name);
|
||
}
|
||
rc->backoff_deadline = TIME_MAX; /* Prevent resetting backoff. */
|
||
disconnect(rc, ETIMEDOUT);
|
||
}
|
||
}
|
||
|
||
static void
|
||
do_tx_work(struct rconn *rc)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
if (list_is_empty(&rc->txq)) {
|
||
return;
|
||
}
|
||
while (!list_is_empty(&rc->txq)) {
|
||
int error = try_send(rc);
|
||
if (error) {
|
||
break;
|
||
}
|
||
rc->last_activity = time_now();
|
||
}
|
||
if (list_is_empty(&rc->txq)) {
|
||
poll_immediate_wake();
|
||
}
|
||
}
|
||
|
||
static unsigned int
|
||
timeout_ACTIVE(const struct rconn *rc)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
if (rc->probe_interval) {
|
||
unsigned int base = MAX(rc->last_activity, rc->state_entered);
|
||
unsigned int arg = base + rc->probe_interval - rc->state_entered;
|
||
return arg;
|
||
}
|
||
return UINT_MAX;
|
||
}
|
||
|
||
static void
|
||
run_ACTIVE(struct rconn *rc)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
if (timed_out(rc)) {
|
||
unsigned int base = MAX(rc->last_activity, rc->state_entered);
|
||
int version;
|
||
|
||
VLOG_DBG("%s: idle %u seconds, sending inactivity probe",
|
||
rc->name, (unsigned int) (time_now() - base));
|
||
|
||
version = rconn_get_version__(rc);
|
||
ovs_assert(version >= 0 && version <= 0xff);
|
||
|
||
/* Ordering is important here: rconn_send() can transition to BACKOFF,
|
||
* and we don't want to transition back to IDLE if so, because then we
|
||
* can end up queuing a packet with vconn == NULL and then *boom*. */
|
||
state_transition(rc, S_IDLE);
|
||
rconn_send__(rc, make_echo_request(version), NULL);
|
||
return;
|
||
}
|
||
|
||
do_tx_work(rc);
|
||
}
|
||
|
||
static unsigned int
|
||
timeout_IDLE(const struct rconn *rc)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
return rc->probe_interval;
|
||
}
|
||
|
||
static void
|
||
run_IDLE(struct rconn *rc)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
if (timed_out(rc)) {
|
||
VLOG_ERR("%s: no response to inactivity probe after %u "
|
||
"seconds, disconnecting",
|
||
rc->name, elapsed_in_this_state(rc));
|
||
disconnect(rc, ETIMEDOUT);
|
||
} else {
|
||
do_tx_work(rc);
|
||
}
|
||
}
|
||
|
||
static unsigned int
|
||
timeout_DISCONNECTED(const struct rconn *rc OVS_UNUSED)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
return UINT_MAX;
|
||
}
|
||
|
||
static void
|
||
run_DISCONNECTED(struct rconn *rc OVS_UNUSED)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
/* Nothing to do. */
|
||
}
|
||
|
||
/* Performs whatever activities are necessary to maintain 'rc': if 'rc' is
|
||
* disconnected, attempts to (re)connect, backing off as necessary; if 'rc' is
|
||
* connected, attempts to send packets in the send queue, if any. */
|
||
void
|
||
rconn_run(struct rconn *rc)
|
||
OVS_EXCLUDED(rc->mutex)
|
||
{
|
||
int old_state;
|
||
size_t i;
|
||
|
||
ovs_mutex_lock(&rc->mutex);
|
||
if (rc->vconn) {
|
||
int error;
|
||
|
||
vconn_run(rc->vconn);
|
||
|
||
error = vconn_get_status(rc->vconn);
|
||
if (error) {
|
||
report_error(rc, error);
|
||
disconnect(rc, error);
|
||
}
|
||
}
|
||
for (i = 0; i < rc->n_monitors; ) {
|
||
struct ofpbuf *msg;
|
||
int retval;
|
||
|
||
vconn_run(rc->monitors[i]);
|
||
|
||
/* Drain any stray message that came in on the monitor connection. */
|
||
retval = vconn_recv(rc->monitors[i], &msg);
|
||
if (!retval) {
|
||
ofpbuf_delete(msg);
|
||
} else if (retval != EAGAIN) {
|
||
close_monitor(rc, i, retval);
|
||
continue;
|
||
}
|
||
i++;
|
||
}
|
||
|
||
do {
|
||
old_state = rc->state;
|
||
switch (rc->state) {
|
||
#define STATE(NAME, VALUE) case S_##NAME: run_##NAME(rc); break;
|
||
STATES
|
||
#undef STATE
|
||
default:
|
||
OVS_NOT_REACHED();
|
||
}
|
||
} while (rc->state != old_state);
|
||
ovs_mutex_unlock(&rc->mutex);
|
||
}
|
||
|
||
/* Causes the next call to poll_block() to wake up when rconn_run() should be
|
||
* called on 'rc'. */
|
||
void
|
||
rconn_run_wait(struct rconn *rc)
|
||
OVS_EXCLUDED(rc->mutex)
|
||
{
|
||
unsigned int timeo;
|
||
size_t i;
|
||
|
||
ovs_mutex_lock(&rc->mutex);
|
||
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]);
|
||
vconn_recv_wait(rc->monitors[i]);
|
||
}
|
||
|
||
timeo = timeout(rc);
|
||
if (timeo != UINT_MAX) {
|
||
long long int expires = sat_add(rc->state_entered, timeo);
|
||
poll_timer_wait_until(expires * 1000);
|
||
}
|
||
ovs_mutex_unlock(&rc->mutex);
|
||
}
|
||
|
||
/* Attempts to receive a packet from 'rc'. If successful, returns the packet;
|
||
* otherwise, returns a null pointer. The caller is responsible for freeing
|
||
* the packet (with ofpbuf_delete()). */
|
||
struct ofpbuf *
|
||
rconn_recv(struct rconn *rc)
|
||
OVS_EXCLUDED(rc->mutex)
|
||
{
|
||
struct ofpbuf *buffer = NULL;
|
||
|
||
ovs_mutex_lock(&rc->mutex);
|
||
if (rc->state & (S_ACTIVE | S_IDLE)) {
|
||
int error = vconn_recv(rc->vconn, &buffer);
|
||
if (!error) {
|
||
copy_to_monitor(rc, buffer);
|
||
if (rc->probably_admitted || is_admitted_msg(buffer)
|
||
|| time_now() - rc->last_connected >= 30) {
|
||
rc->probably_admitted = true;
|
||
rc->last_admitted = time_now();
|
||
}
|
||
rc->last_activity = time_now();
|
||
rc->packets_received++;
|
||
if (rc->state == S_IDLE) {
|
||
state_transition(rc, S_ACTIVE);
|
||
}
|
||
} else if (error != EAGAIN) {
|
||
report_error(rc, error);
|
||
disconnect(rc, error);
|
||
}
|
||
}
|
||
ovs_mutex_unlock(&rc->mutex);
|
||
|
||
return buffer;
|
||
}
|
||
|
||
/* Causes the next call to poll_block() to wake up when a packet may be ready
|
||
* to be received by vconn_recv() on 'rc'. */
|
||
void
|
||
rconn_recv_wait(struct rconn *rc)
|
||
OVS_EXCLUDED(rc->mutex)
|
||
{
|
||
ovs_mutex_lock(&rc->mutex);
|
||
if (rc->vconn) {
|
||
vconn_wait(rc->vconn, WAIT_RECV);
|
||
}
|
||
ovs_mutex_unlock(&rc->mutex);
|
||
}
|
||
|
||
static int
|
||
rconn_send__(struct rconn *rc, struct ofpbuf *b,
|
||
struct rconn_packet_counter *counter)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
if (rconn_is_connected(rc)) {
|
||
COVERAGE_INC(rconn_queued);
|
||
copy_to_monitor(rc, b);
|
||
|
||
if (counter) {
|
||
rconn_packet_counter_inc(counter, ofpbuf_size(b));
|
||
}
|
||
|
||
/* Reuse 'frame' as a private pointer while 'b' is in txq. */
|
||
ofpbuf_set_frame(b, counter);
|
||
|
||
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.next == &b->list_node) {
|
||
try_send(rc);
|
||
}
|
||
return 0;
|
||
} else {
|
||
ofpbuf_delete(b);
|
||
return ENOTCONN;
|
||
}
|
||
}
|
||
|
||
/* Sends 'b' on 'rc'. Returns 0 if successful, or ENOTCONN if 'rc' is not
|
||
* currently connected. Takes ownership of 'b'.
|
||
*
|
||
* If 'counter' is non-null, then 'counter' will be incremented while the
|
||
* packet is in flight, then decremented when it has been sent (or discarded
|
||
* due to disconnection). Because 'b' may be sent (or discarded) before this
|
||
* function returns, the caller may not be able to observe any change in
|
||
* 'counter'.
|
||
*
|
||
* There is no rconn_send_wait() function: an rconn has a send queue that it
|
||
* takes care of sending if you call rconn_run(), which will have the side
|
||
* effect of waking up poll_block(). */
|
||
int
|
||
rconn_send(struct rconn *rc, struct ofpbuf *b,
|
||
struct rconn_packet_counter *counter)
|
||
OVS_EXCLUDED(rc->mutex)
|
||
{
|
||
int error;
|
||
|
||
ovs_mutex_lock(&rc->mutex);
|
||
error = rconn_send__(rc, b, counter);
|
||
ovs_mutex_unlock(&rc->mutex);
|
||
|
||
return error;
|
||
}
|
||
|
||
/* Sends 'b' on 'rc'. Increments 'counter' while the packet is in flight; it
|
||
* will be decremented when it has been sent (or discarded due to
|
||
* disconnection). Returns 0 if successful, EAGAIN if 'counter->n' is already
|
||
* at least as large as 'queue_limit', or ENOTCONN if 'rc' is not currently
|
||
* connected. Regardless of return value, 'b' is destroyed.
|
||
*
|
||
* Because 'b' may be sent (or discarded) before this function returns, the
|
||
* caller may not be able to observe any change in 'counter'.
|
||
*
|
||
* There is no rconn_send_wait() function: an rconn has a send queue that it
|
||
* takes care of sending if you call rconn_run(), which will have the side
|
||
* effect of waking up poll_block(). */
|
||
int
|
||
rconn_send_with_limit(struct rconn *rc, struct ofpbuf *b,
|
||
struct rconn_packet_counter *counter, int queue_limit)
|
||
OVS_EXCLUDED(rc->mutex)
|
||
{
|
||
int error;
|
||
|
||
ovs_mutex_lock(&rc->mutex);
|
||
if (rconn_packet_counter_n_packets(counter) < queue_limit) {
|
||
error = rconn_send__(rc, b, counter);
|
||
} else {
|
||
COVERAGE_INC(rconn_overflow);
|
||
ofpbuf_delete(b);
|
||
error = EAGAIN;
|
||
}
|
||
ovs_mutex_unlock(&rc->mutex);
|
||
|
||
return error;
|
||
}
|
||
|
||
/* Returns the total number of packets successfully sent on the underlying
|
||
* vconn. A packet is not counted as sent while it is still queued in the
|
||
* rconn, only when it has been successfuly passed to the vconn. */
|
||
unsigned int
|
||
rconn_packets_sent(const struct rconn *rc)
|
||
{
|
||
return rc->packets_sent;
|
||
}
|
||
|
||
/* Adds 'vconn' to 'rc' as a monitoring connection, to which all messages sent
|
||
* and received on 'rconn' will be copied. 'rc' takes ownership of 'vconn'. */
|
||
void
|
||
rconn_add_monitor(struct rconn *rc, struct vconn *vconn)
|
||
OVS_EXCLUDED(rc->mutex)
|
||
{
|
||
ovs_mutex_lock(&rc->mutex);
|
||
if (rc->n_monitors < ARRAY_SIZE(rc->monitors)) {
|
||
VLOG_INFO("new monitor connection from %s", vconn_get_name(vconn));
|
||
rc->monitors[rc->n_monitors++] = vconn;
|
||
} else {
|
||
VLOG_DBG("too many monitor connections, discarding %s",
|
||
vconn_get_name(vconn));
|
||
vconn_close(vconn);
|
||
}
|
||
ovs_mutex_unlock(&rc->mutex);
|
||
}
|
||
|
||
/* Returns 'rc''s name. This is a name for human consumption, appropriate for
|
||
* use in log messages. It is not necessarily a name that may be passed
|
||
* directly to, e.g., vconn_open(). */
|
||
const char *
|
||
rconn_get_name(const struct rconn *rc)
|
||
{
|
||
return rc->name;
|
||
}
|
||
|
||
/* Sets 'rc''s name to 'new_name'. */
|
||
void
|
||
rconn_set_name(struct rconn *rc, const char *new_name)
|
||
OVS_EXCLUDED(rc->mutex)
|
||
{
|
||
ovs_mutex_lock(&rc->mutex);
|
||
free(rc->name);
|
||
rc->name = xstrdup(new_name);
|
||
ovs_mutex_unlock(&rc->mutex);
|
||
}
|
||
|
||
/* Returns 'rc''s target. This is intended to be a string that may be passed
|
||
* directly to, e.g., vconn_open(). */
|
||
const char *
|
||
rconn_get_target(const struct rconn *rc)
|
||
{
|
||
return rc->target;
|
||
}
|
||
|
||
/* Returns true if 'rconn' is connected or in the process of reconnecting,
|
||
* false if 'rconn' is disconnected and will not reconnect on its own. */
|
||
bool
|
||
rconn_is_alive(const struct rconn *rconn)
|
||
{
|
||
return rconn->state != S_VOID && rconn->state != S_DISCONNECTED;
|
||
}
|
||
|
||
/* Returns true if 'rconn' is connected, false otherwise. */
|
||
bool
|
||
rconn_is_connected(const struct rconn *rconn)
|
||
{
|
||
return is_connected_state(rconn->state);
|
||
}
|
||
|
||
static bool
|
||
rconn_is_admitted__(const struct rconn *rconn)
|
||
OVS_REQUIRES(rconn->mutex)
|
||
{
|
||
return (rconn_is_connected(rconn)
|
||
&& rconn->last_admitted >= rconn->last_connected);
|
||
}
|
||
|
||
/* Returns true if 'rconn' is connected and thought to have been accepted by
|
||
* the peer's admission-control policy. */
|
||
bool
|
||
rconn_is_admitted(const struct rconn *rconn)
|
||
OVS_EXCLUDED(rconn->mutex)
|
||
{
|
||
bool admitted;
|
||
|
||
ovs_mutex_lock(&rconn->mutex);
|
||
admitted = rconn_is_admitted__(rconn);
|
||
ovs_mutex_unlock(&rconn->mutex);
|
||
|
||
return admitted;
|
||
}
|
||
|
||
/* Returns 0 if 'rconn' is currently connected and considered to have been
|
||
* accepted by the peer's admission-control policy, otherwise the number of
|
||
* seconds since 'rconn' was last in such a state. */
|
||
int
|
||
rconn_failure_duration(const struct rconn *rconn)
|
||
OVS_EXCLUDED(rconn->mutex)
|
||
{
|
||
int duration;
|
||
|
||
ovs_mutex_lock(&rconn->mutex);
|
||
duration = (rconn_is_admitted__(rconn)
|
||
? 0
|
||
: time_now() - rconn->last_admitted);
|
||
ovs_mutex_unlock(&rconn->mutex);
|
||
|
||
return duration;
|
||
}
|
||
|
||
static int
|
||
rconn_get_version__(const struct rconn *rconn)
|
||
OVS_REQUIRES(rconn->mutex)
|
||
{
|
||
return rconn->vconn ? vconn_get_version(rconn->vconn) : -1;
|
||
}
|
||
|
||
/* Returns the OpenFlow version negotiated with the peer, or -1 if there is
|
||
* currently no connection or if version negotiation is not yet complete. */
|
||
int
|
||
rconn_get_version(const struct rconn *rconn)
|
||
OVS_EXCLUDED(rconn->mutex)
|
||
{
|
||
int version;
|
||
|
||
ovs_mutex_lock(&rconn->mutex);
|
||
version = rconn_get_version__(rconn);
|
||
ovs_mutex_unlock(&rconn->mutex);
|
||
|
||
return version;
|
||
}
|
||
|
||
/* Returns the total number of packets successfully received by the underlying
|
||
* vconn. */
|
||
unsigned int
|
||
rconn_packets_received(const struct rconn *rc)
|
||
{
|
||
return rc->packets_received;
|
||
}
|
||
|
||
/* Returns a string representing the internal state of 'rc'. The caller must
|
||
* not modify or free the string. */
|
||
const char *
|
||
rconn_get_state(const struct rconn *rc)
|
||
{
|
||
return state_name(rc->state);
|
||
}
|
||
|
||
/* Returns the time at which the last successful connection was made by
|
||
* '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 'rc''s current connection sequence number, a number that changes
|
||
* every time that 'rconn' connects or disconnects. */
|
||
unsigned int
|
||
rconn_get_connection_seqno(const struct rconn *rc)
|
||
{
|
||
return rc->seqno;
|
||
}
|
||
|
||
/* Returns a value that explains why 'rc' last disconnected:
|
||
*
|
||
* - 0 means that the last disconnection was caused by a call to
|
||
* rconn_disconnect(), or that 'rc' is new and has not yet completed its
|
||
* initial connection or connection attempt.
|
||
*
|
||
* - EOF means that the connection was closed in the normal way by the peer.
|
||
*
|
||
* - A positive integer is an errno value that represents the error.
|
||
*/
|
||
int
|
||
rconn_get_last_error(const struct rconn *rc)
|
||
{
|
||
return rc->last_error;
|
||
}
|
||
|
||
/* Returns the number of messages queued for transmission on 'rc'. */
|
||
unsigned int
|
||
rconn_count_txqlen(const struct rconn *rc)
|
||
OVS_EXCLUDED(rc->mutex)
|
||
{
|
||
unsigned int len;
|
||
|
||
ovs_mutex_lock(&rc->mutex);
|
||
len = list_size(&rc->txq);
|
||
ovs_mutex_unlock(&rc->mutex);
|
||
|
||
return len;
|
||
}
|
||
|
||
struct rconn_packet_counter *
|
||
rconn_packet_counter_create(void)
|
||
{
|
||
struct rconn_packet_counter *c = xzalloc(sizeof *c);
|
||
ovs_mutex_init(&c->mutex);
|
||
ovs_mutex_lock(&c->mutex);
|
||
c->ref_cnt = 1;
|
||
ovs_mutex_unlock(&c->mutex);
|
||
return c;
|
||
}
|
||
|
||
void
|
||
rconn_packet_counter_destroy(struct rconn_packet_counter *c)
|
||
{
|
||
if (c) {
|
||
bool dead;
|
||
|
||
ovs_mutex_lock(&c->mutex);
|
||
ovs_assert(c->ref_cnt > 0);
|
||
dead = !--c->ref_cnt && !c->n_packets;
|
||
ovs_mutex_unlock(&c->mutex);
|
||
|
||
if (dead) {
|
||
ovs_mutex_destroy(&c->mutex);
|
||
free(c);
|
||
}
|
||
}
|
||
}
|
||
|
||
void
|
||
rconn_packet_counter_inc(struct rconn_packet_counter *c, unsigned int n_bytes)
|
||
{
|
||
ovs_mutex_lock(&c->mutex);
|
||
c->n_packets++;
|
||
c->n_bytes += n_bytes;
|
||
ovs_mutex_unlock(&c->mutex);
|
||
}
|
||
|
||
void
|
||
rconn_packet_counter_dec(struct rconn_packet_counter *c, unsigned int n_bytes)
|
||
{
|
||
bool dead = false;
|
||
|
||
ovs_mutex_lock(&c->mutex);
|
||
ovs_assert(c->n_packets > 0);
|
||
ovs_assert(c->n_packets == 1
|
||
? c->n_bytes == n_bytes
|
||
: c->n_bytes > n_bytes);
|
||
c->n_packets--;
|
||
c->n_bytes -= n_bytes;
|
||
dead = !c->n_packets && !c->ref_cnt;
|
||
ovs_mutex_unlock(&c->mutex);
|
||
|
||
if (dead) {
|
||
ovs_mutex_destroy(&c->mutex);
|
||
free(c);
|
||
}
|
||
}
|
||
|
||
unsigned int
|
||
rconn_packet_counter_n_packets(const struct rconn_packet_counter *c)
|
||
{
|
||
unsigned int n;
|
||
|
||
ovs_mutex_lock(&c->mutex);
|
||
n = c->n_packets;
|
||
ovs_mutex_unlock(&c->mutex);
|
||
|
||
return n;
|
||
}
|
||
|
||
unsigned int
|
||
rconn_packet_counter_n_bytes(const struct rconn_packet_counter *c)
|
||
{
|
||
unsigned int n;
|
||
|
||
ovs_mutex_lock(&c->mutex);
|
||
n = c->n_bytes;
|
||
ovs_mutex_unlock(&c->mutex);
|
||
|
||
return n;
|
||
}
|
||
|
||
/* Set rc->target and rc->name to 'target' and 'name', respectively. If 'name'
|
||
* is null, 'target' is used. */
|
||
static void
|
||
rconn_set_target__(struct rconn *rc, const char *target, const char *name)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
free(rc->name);
|
||
rc->name = xstrdup(name ? name : target);
|
||
free(rc->target);
|
||
rc->target = xstrdup(target);
|
||
}
|
||
|
||
/* Tries to send a packet from 'rc''s send buffer. Returns 0 if successful,
|
||
* otherwise a positive errno value. */
|
||
static int
|
||
try_send(struct rconn *rc)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
struct ofpbuf *msg = ofpbuf_from_list(rc->txq.next);
|
||
unsigned int n_bytes = ofpbuf_size(msg);
|
||
struct rconn_packet_counter *counter = msg->frame;
|
||
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);
|
||
ofpbuf_set_frame(msg, NULL);
|
||
|
||
retval = vconn_send(rc->vconn, msg);
|
||
if (retval) {
|
||
ofpbuf_set_frame(msg, counter);
|
||
list_push_front(&rc->txq, &msg->list_node);
|
||
if (retval != EAGAIN) {
|
||
report_error(rc, retval);
|
||
disconnect(rc, retval);
|
||
}
|
||
return retval;
|
||
}
|
||
COVERAGE_INC(rconn_sent);
|
||
rc->packets_sent++;
|
||
if (counter) {
|
||
rconn_packet_counter_dec(counter, n_bytes);
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/* Reports that 'error' caused 'rc' to disconnect. 'error' may be a positive
|
||
* errno value, or it may be EOF to indicate that the connection was closed
|
||
* normally. */
|
||
static void
|
||
report_error(struct rconn *rc, int error)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
/* On Windows, when a peer terminates without calling a closesocket()
|
||
* on socket fd, we get WSAECONNRESET. Don't print warning messages
|
||
* for that case. */
|
||
if (error == EOF
|
||
#ifdef _WIN32
|
||
|| error == WSAECONNRESET
|
||
#endif
|
||
) {
|
||
/* If 'rc' isn't reliable, then we don't really expect this connection
|
||
* to last forever anyway (probably it's a connection that we received
|
||
* via accept()), so use DBG level to avoid cluttering the logs. */
|
||
enum vlog_level level = rc->reliable ? VLL_INFO : VLL_DBG;
|
||
VLOG(level, "%s: connection closed by peer", rc->name);
|
||
} else {
|
||
VLOG_WARN("%s: connection dropped (%s)",
|
||
rc->name, ovs_strerror(error));
|
||
}
|
||
}
|
||
|
||
/* Disconnects 'rc' and records 'error' as the error that caused 'rc''s last
|
||
* disconnection:
|
||
*
|
||
* - 0 means that this disconnection is due to a request by 'rc''s client,
|
||
* not due to any kind of network error.
|
||
*
|
||
* - EOF means that the connection was closed in the normal way by the peer.
|
||
*
|
||
* - A positive integer is an errno value that represents the error.
|
||
*/
|
||
static void
|
||
disconnect(struct rconn *rc, int error)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
rc->last_error = error;
|
||
if (rc->vconn) {
|
||
vconn_close(rc->vconn);
|
||
rc->vconn = NULL;
|
||
}
|
||
if (rc->reliable) {
|
||
time_t now = time_now();
|
||
|
||
if (rc->state & (S_CONNECTING | S_ACTIVE | S_IDLE)) {
|
||
rc->last_disconnected = now;
|
||
flush_queue(rc);
|
||
}
|
||
|
||
if (now >= rc->backoff_deadline) {
|
||
rc->backoff = 1;
|
||
} else if (rc->backoff < rc->max_backoff / 2) {
|
||
rc->backoff = MAX(1, 2 * rc->backoff);
|
||
VLOG_INFO("%s: waiting %d seconds before reconnect",
|
||
rc->name, rc->backoff);
|
||
} else {
|
||
if (rconn_logging_connection_attempts__(rc)) {
|
||
VLOG_INFO("%s: continuing to retry connections in the "
|
||
"background but suppressing further logging",
|
||
rc->name);
|
||
}
|
||
rc->backoff = rc->max_backoff;
|
||
}
|
||
rc->backoff_deadline = now + rc->backoff;
|
||
state_transition(rc, S_BACKOFF);
|
||
} else {
|
||
rc->last_disconnected = time_now();
|
||
state_transition(rc, S_DISCONNECTED);
|
||
}
|
||
}
|
||
|
||
/* Drops all the packets from 'rc''s send queue and decrements their queue
|
||
* counts. */
|
||
static void
|
||
flush_queue(struct rconn *rc)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
if (list_is_empty(&rc->txq)) {
|
||
return;
|
||
}
|
||
while (!list_is_empty(&rc->txq)) {
|
||
struct ofpbuf *b = ofpbuf_from_list(list_pop_front(&rc->txq));
|
||
struct rconn_packet_counter *counter = b->frame;
|
||
if (counter) {
|
||
rconn_packet_counter_dec(counter, ofpbuf_size(b));
|
||
}
|
||
COVERAGE_INC(rconn_discarded);
|
||
ofpbuf_delete(b);
|
||
}
|
||
poll_immediate_wake();
|
||
}
|
||
|
||
static unsigned int
|
||
elapsed_in_this_state(const struct rconn *rc)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
return time_now() - rc->state_entered;
|
||
}
|
||
|
||
static unsigned int
|
||
timeout(const struct rconn *rc)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
switch (rc->state) {
|
||
#define STATE(NAME, VALUE) case S_##NAME: return timeout_##NAME(rc);
|
||
STATES
|
||
#undef STATE
|
||
default:
|
||
OVS_NOT_REACHED();
|
||
}
|
||
}
|
||
|
||
static bool
|
||
timed_out(const struct rconn *rc)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
return time_now() >= sat_add(rc->state_entered, timeout(rc));
|
||
}
|
||
|
||
static void
|
||
state_transition(struct rconn *rc, enum state state)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
rc->seqno += (rc->state == S_ACTIVE) != (state == S_ACTIVE);
|
||
if (is_connected_state(state) && !is_connected_state(rc->state)) {
|
||
rc->probably_admitted = false;
|
||
}
|
||
if (rconn_is_connected(rc)) {
|
||
rc->total_time_connected += elapsed_in_this_state(rc);
|
||
}
|
||
VLOG_DBG("%s: entering %s", rc->name, state_name(state));
|
||
rc->state = state;
|
||
rc->state_entered = time_now();
|
||
}
|
||
|
||
static void
|
||
close_monitor(struct rconn *rc, size_t idx, int retval)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
VLOG_DBG("%s: closing monitor connection to %s: %s",
|
||
rconn_get_name(rc), vconn_get_name(rc->monitors[idx]),
|
||
ovs_retval_to_string(retval));
|
||
rc->monitors[idx] = rc->monitors[--rc->n_monitors];
|
||
}
|
||
|
||
static void
|
||
copy_to_monitor(struct rconn *rc, const struct ofpbuf *b)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
struct ofpbuf *clone = NULL;
|
||
int retval;
|
||
size_t i;
|
||
|
||
for (i = 0; i < rc->n_monitors; ) {
|
||
struct vconn *vconn = rc->monitors[i];
|
||
|
||
if (!clone) {
|
||
clone = ofpbuf_clone(b);
|
||
}
|
||
retval = vconn_send(vconn, clone);
|
||
if (!retval) {
|
||
clone = NULL;
|
||
} else if (retval != EAGAIN) {
|
||
close_monitor(rc, i, retval);
|
||
continue;
|
||
}
|
||
i++;
|
||
}
|
||
ofpbuf_delete(clone);
|
||
}
|
||
|
||
static bool
|
||
is_connected_state(enum state state)
|
||
{
|
||
return (state & (S_ACTIVE | S_IDLE)) != 0;
|
||
}
|
||
|
||
/* When a switch initially connects to a controller, the controller may spend a
|
||
* little time examining the switch, looking at, for example, its datapath ID,
|
||
* before it decides whether it is willing to control that switch. At that
|
||
* point, it either disconnects or starts controlling the switch.
|
||
*
|
||
* This function returns a guess to its caller about whether 'b' is OpenFlow
|
||
* message that indicates that the controller has decided to control the
|
||
* switch. It returns false if the message is one that a controller typically
|
||
* uses to determine whether a switch is admissible, true if the message is one
|
||
* that would typically be used only after the controller has admitted the
|
||
* switch. */
|
||
static bool
|
||
is_admitted_msg(const struct ofpbuf *b)
|
||
{
|
||
enum ofptype type;
|
||
enum ofperr error;
|
||
|
||
error = ofptype_decode(&type, ofpbuf_data(b));
|
||
if (error) {
|
||
return false;
|
||
}
|
||
|
||
switch (type) {
|
||
case OFPTYPE_HELLO:
|
||
case OFPTYPE_ERROR:
|
||
case OFPTYPE_ECHO_REQUEST:
|
||
case OFPTYPE_ECHO_REPLY:
|
||
case OFPTYPE_FEATURES_REQUEST:
|
||
case OFPTYPE_FEATURES_REPLY:
|
||
case OFPTYPE_GET_CONFIG_REQUEST:
|
||
case OFPTYPE_GET_CONFIG_REPLY:
|
||
case OFPTYPE_SET_CONFIG:
|
||
case OFPTYPE_QUEUE_GET_CONFIG_REQUEST:
|
||
case OFPTYPE_QUEUE_GET_CONFIG_REPLY:
|
||
case OFPTYPE_GET_ASYNC_REQUEST:
|
||
case OFPTYPE_GET_ASYNC_REPLY:
|
||
case OFPTYPE_GROUP_STATS_REQUEST:
|
||
case OFPTYPE_GROUP_STATS_REPLY:
|
||
case OFPTYPE_GROUP_DESC_STATS_REQUEST:
|
||
case OFPTYPE_GROUP_DESC_STATS_REPLY:
|
||
case OFPTYPE_GROUP_FEATURES_STATS_REQUEST:
|
||
case OFPTYPE_GROUP_FEATURES_STATS_REPLY:
|
||
case OFPTYPE_TABLE_FEATURES_STATS_REQUEST:
|
||
case OFPTYPE_TABLE_FEATURES_STATS_REPLY:
|
||
case OFPTYPE_BUNDLE_CONTROL:
|
||
case OFPTYPE_BUNDLE_ADD_MESSAGE:
|
||
return false;
|
||
|
||
case OFPTYPE_PACKET_IN:
|
||
case OFPTYPE_FLOW_REMOVED:
|
||
case OFPTYPE_PORT_STATUS:
|
||
case OFPTYPE_PACKET_OUT:
|
||
case OFPTYPE_FLOW_MOD:
|
||
case OFPTYPE_GROUP_MOD:
|
||
case OFPTYPE_PORT_MOD:
|
||
case OFPTYPE_TABLE_MOD:
|
||
case OFPTYPE_METER_MOD:
|
||
case OFPTYPE_BARRIER_REQUEST:
|
||
case OFPTYPE_BARRIER_REPLY:
|
||
case OFPTYPE_DESC_STATS_REQUEST:
|
||
case OFPTYPE_DESC_STATS_REPLY:
|
||
case OFPTYPE_FLOW_STATS_REQUEST:
|
||
case OFPTYPE_FLOW_STATS_REPLY:
|
||
case OFPTYPE_AGGREGATE_STATS_REQUEST:
|
||
case OFPTYPE_AGGREGATE_STATS_REPLY:
|
||
case OFPTYPE_TABLE_STATS_REQUEST:
|
||
case OFPTYPE_TABLE_STATS_REPLY:
|
||
case OFPTYPE_PORT_STATS_REQUEST:
|
||
case OFPTYPE_PORT_STATS_REPLY:
|
||
case OFPTYPE_QUEUE_STATS_REQUEST:
|
||
case OFPTYPE_QUEUE_STATS_REPLY:
|
||
case OFPTYPE_PORT_DESC_STATS_REQUEST:
|
||
case OFPTYPE_PORT_DESC_STATS_REPLY:
|
||
case OFPTYPE_METER_STATS_REQUEST:
|
||
case OFPTYPE_METER_STATS_REPLY:
|
||
case OFPTYPE_METER_CONFIG_STATS_REQUEST:
|
||
case OFPTYPE_METER_CONFIG_STATS_REPLY:
|
||
case OFPTYPE_METER_FEATURES_STATS_REQUEST:
|
||
case OFPTYPE_METER_FEATURES_STATS_REPLY:
|
||
case OFPTYPE_ROLE_REQUEST:
|
||
case OFPTYPE_ROLE_REPLY:
|
||
case OFPTYPE_ROLE_STATUS:
|
||
case OFPTYPE_SET_FLOW_FORMAT:
|
||
case OFPTYPE_FLOW_MOD_TABLE_ID:
|
||
case OFPTYPE_SET_PACKET_IN_FORMAT:
|
||
case OFPTYPE_FLOW_AGE:
|
||
case OFPTYPE_SET_ASYNC_CONFIG:
|
||
case OFPTYPE_SET_CONTROLLER_ID:
|
||
case OFPTYPE_FLOW_MONITOR_STATS_REQUEST:
|
||
case OFPTYPE_FLOW_MONITOR_STATS_REPLY:
|
||
case OFPTYPE_FLOW_MONITOR_CANCEL:
|
||
case OFPTYPE_FLOW_MONITOR_PAUSED:
|
||
case OFPTYPE_FLOW_MONITOR_RESUMED:
|
||
default:
|
||
return true;
|
||
}
|
||
}
|
||
|
||
/* Returns true if 'rc' is currently logging information about connection
|
||
* attempts, false if logging should be suppressed because 'rc' hasn't
|
||
* successuflly connected in too long. */
|
||
static bool
|
||
rconn_logging_connection_attempts__(const struct rconn *rc)
|
||
OVS_REQUIRES(rc->mutex)
|
||
{
|
||
return rc->backoff < rc->max_backoff;
|
||
}
|