/*
- * Copyright (c) 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
+ * Copyright (c) 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.
#include "bfd.h"
#include "cfm.h"
+#include "guarded-list.h"
#include "hash.h"
#include "heap.h"
#include "hmap.h"
uint8_t hw_addr[OFP_ETH_ALEN]; /* Hardware address. */
};
+/* Entry of the 'send_soon' list. Contains the pointer to the
+ * 'ofport_dpif'. Note, the pointed object is not protected, so
+ * users should always use the mport_find() to convert it to 'mport'. */
+struct send_soon_entry {
+ struct list list_node; /* In send_soon. */
+ const struct ofport_dpif *ofport;
+};
+
/* hmap that contains "struct mport"s. */
static struct hmap monitor_hmap = HMAP_INITIALIZER(&monitor_hmap);
/* heap for ordering mport based on bfd/cfm wakeup time. */
static struct heap monitor_heap;
+/* guarded-list for storing the mports that need to send bfd/cfm control
+ * packet soon. */
+static struct guarded_list send_soon = GUARDED_LIST_INITIALIZER(&send_soon);
+
/* The monitor thread id. */
static pthread_t monitor_tid;
/* True if the monitor thread is running. */
static bool monitor_running;
static struct latch monitor_exit_latch;
-static struct ovs_rwlock monitor_rwlock = OVS_RWLOCK_INITIALIZER;
+static struct ovs_mutex monitor_mutex = OVS_MUTEX_INITIALIZER;
static void *monitor_main(void *);
+static void monitor_check_send_soon(struct ofpbuf *);
static void monitor_run(void);
+static void monitor_mport_run(struct mport *, struct ofpbuf *);
static void mport_register(const struct ofport_dpif *, struct bfd *,
struct cfm *, uint8_t[ETH_ADDR_LEN])
- OVS_REQ_WRLOCK(monitor_rwlock);
+ OVS_REQUIRES(monitor_mutex);
static void mport_unregister(const struct ofport_dpif *)
- OVS_REQ_WRLOCK(monitor_rwlock);
+ OVS_REQUIRES(monitor_mutex);
static void mport_update(struct mport *, struct bfd *, struct cfm *,
- uint8_t[ETH_ADDR_LEN]) OVS_REQ_WRLOCK(monitor_rwlock);
+ uint8_t[ETH_ADDR_LEN]) OVS_REQUIRES(monitor_mutex);
static struct mport *mport_find(const struct ofport_dpif *)
- OVS_REQ_WRLOCK(monitor_rwlock);
+ OVS_REQUIRES(monitor_mutex);
/* Tries finding and returning the 'mport' from the monitor_hmap.
* If there is no such 'mport', returns NULL. */
static struct mport *
-mport_find(const struct ofport_dpif *ofport) OVS_REQ_WRLOCK(monitor_rwlock)
+mport_find(const struct ofport_dpif *ofport) OVS_REQUIRES(monitor_mutex)
{
struct mport *node;
static void
mport_register(const struct ofport_dpif *ofport, struct bfd *bfd,
struct cfm *cfm, uint8_t *hw_addr)
- OVS_REQ_WRLOCK(monitor_rwlock)
+ OVS_REQUIRES(monitor_mutex)
{
struct mport *mport = mport_find(ofport);
/* Removes mport from monitor_hmap and monitor_heap and frees it. */
static void
mport_unregister(const struct ofport_dpif *ofport)
- OVS_REQ_WRLOCK(monitor_rwlock)
+ OVS_REQUIRES(monitor_mutex)
{
struct mport *mport = mport_find(ofport);
/* Updates the fields of an existing mport struct. */
static void
mport_update(struct mport *mport, struct bfd *bfd, struct cfm *cfm,
- uint8_t hw_addr[ETH_ADDR_LEN]) OVS_REQ_WRLOCK(monitor_rwlock)
+ uint8_t hw_addr[ETH_ADDR_LEN]) OVS_REQUIRES(monitor_mutex)
{
ovs_assert(mport);
static void *
monitor_main(void * args OVS_UNUSED)
{
- set_subprogram_name("monitor");
VLOG_INFO("monitor thread created");
while (!latch_is_set(&monitor_exit_latch)) {
monitor_run();
* reconfigured monitoring ports are run in a timely manner. */
#define MONITOR_INTERVAL_MSEC 100
-/* Checks the sending of control packets on mports that have timed out.
- * Sends the control packets if needed. Executes bfd and cfm periodic
- * functions (run, wait) on those mports. */
+/* Checks the 'send_soon' list and the heap for mports that have timed
+ * out bfd/cfm sessions. */
static void
monitor_run(void)
{
struct ofpbuf packet;
ofpbuf_use_stub(&packet, stub, sizeof stub);
- ovs_rwlock_wrlock(&monitor_rwlock);
+ ovs_mutex_lock(&monitor_mutex);
+
+ /* The monitor_check_send_soon() needs to be run twice. The first
+ * time is for preventing the same 'mport' from being processed twice
+ * (i.e. once from heap, the other from the 'send_soon' array).
+ * The second run is to cover the case when the control packet is sent
+ * via patch port and the other end needs to send back immediately. */
+ monitor_check_send_soon(&packet);
+
prio_now = MSEC_TO_PRIO(time_msec());
/* Peeks the top of heap and checks if we should run this mport. */
while (!heap_is_empty(&monitor_heap)
&& heap_max(&monitor_heap)->priority >= prio_now) {
- long long int next_wake_time;
struct mport *mport;
mport = CONTAINER_OF(heap_max(&monitor_heap), struct mport, heap_node);
- if (mport->cfm && cfm_should_send_ccm(mport->cfm)) {
- ofpbuf_clear(&packet);
- cfm_compose_ccm(mport->cfm, &packet, mport->hw_addr);
- ofproto_dpif_send_packet(mport->ofport, &packet);
- }
- if (mport->bfd && bfd_should_send_packet(mport->bfd)) {
- ofpbuf_clear(&packet);
- bfd_put_packet(mport->bfd, &packet, mport->hw_addr);
- ofproto_dpif_send_packet(mport->ofport, &packet);
- }
- if (mport->cfm) {
- cfm_run(mport->cfm);
- cfm_wait(mport->cfm);
- }
- if (mport->bfd) {
- bfd_run(mport->bfd);
- bfd_wait(mport->bfd);
- }
- /* Computes the next wakeup time for this mport. */
- next_wake_time = MIN(bfd_wake_time(mport->bfd),
- cfm_wake_time(mport->cfm));
- heap_change(&monitor_heap, &mport->heap_node,
- MSEC_TO_PRIO(next_wake_time));
+ monitor_mport_run(mport, &packet);
}
+ monitor_check_send_soon(&packet);
+
/* Waits on the earliest next wakeup time. */
if (!heap_is_empty(&monitor_heap)) {
long long int next_timeout, next_mport_wakeup;
next_mport_wakeup = PRIO_TO_MSEC(heap_max(&monitor_heap)->priority);
poll_timer_wait_until(MIN(next_timeout, next_mport_wakeup));
}
- ovs_rwlock_unlock(&monitor_rwlock);
+ ovs_mutex_unlock(&monitor_mutex);
ofpbuf_uninit(&packet);
}
+
+/* Checks the 'send_soon' list for any mport that needs to send cfm/bfd
+ * control packet immediately, and calls monitor_mport_run(). */
+static void
+monitor_check_send_soon(struct ofpbuf *packet)
+ OVS_REQUIRES(monitor_mutex)
+{
+ while (!guarded_list_is_empty(&send_soon)) {
+ struct send_soon_entry *entry;
+ struct mport *mport;
+
+ entry = CONTAINER_OF(guarded_list_pop_front(&send_soon),
+ struct send_soon_entry, list_node);
+ mport = mport_find(entry->ofport);
+ if (mport) {
+ monitor_mport_run(mport, packet);
+ }
+ free(entry);
+ }
+}
+
+/* Checks the sending of control packet on 'mport'. Sends the control
+ * packet if needed. Executes bfd and cfm periodic functions (run, wait)
+ * on 'mport'. And changes the location of 'mport' in heap based on next
+ * timeout. */
+static void
+monitor_mport_run(struct mport *mport, struct ofpbuf *packet)
+ OVS_REQUIRES(monitor_mutex)
+{
+ long long int next_wake_time;
+
+ if (mport->cfm && cfm_should_send_ccm(mport->cfm)) {
+ ofpbuf_clear(packet);
+ cfm_compose_ccm(mport->cfm, packet, mport->hw_addr);
+ ofproto_dpif_send_packet(mport->ofport, packet);
+ }
+ if (mport->bfd && bfd_should_send_packet(mport->bfd)) {
+ ofpbuf_clear(packet);
+ bfd_put_packet(mport->bfd, packet, mport->hw_addr);
+ ofproto_dpif_send_packet(mport->ofport, packet);
+ }
+ if (mport->cfm) {
+ cfm_run(mport->cfm);
+ cfm_wait(mport->cfm);
+ }
+ if (mport->bfd) {
+ bfd_run(mport->bfd);
+ bfd_wait(mport->bfd);
+ }
+ /* Computes the next wakeup time for this mport. */
+ next_wake_time = MIN(bfd_wake_time(mport->bfd),
+ cfm_wake_time(mport->cfm));
+ heap_change(&monitor_heap, &mport->heap_node,
+ MSEC_TO_PRIO(next_wake_time));
+}
\f
/* Creates the mport in monitor module if either bfd or cfm
struct bfd *bfd, struct cfm *cfm,
uint8_t hw_addr[ETH_ADDR_LEN])
{
- ovs_rwlock_wrlock(&monitor_rwlock);
+ ovs_mutex_lock(&monitor_mutex);
if (!cfm && !bfd) {
mport_unregister(ofport);
} else {
mport_register(ofport, bfd, cfm, hw_addr);
}
- ovs_rwlock_unlock(&monitor_rwlock);
+ ovs_mutex_unlock(&monitor_mutex);
/* If the monitor thread is not running and the hmap
* is not empty, starts it. If it is and the hmap is empty,
* terminates it. */
if (!monitor_running && !hmap_is_empty(&monitor_hmap)) {
latch_init(&monitor_exit_latch);
- xpthread_create(&monitor_tid, NULL, monitor_main, NULL);
+ monitor_tid = ovs_thread_create("monitor", monitor_main, NULL);
monitor_running = true;
} else if (monitor_running && hmap_is_empty(&monitor_hmap)) {
latch_set(&monitor_exit_latch);
}
}
-/* Moves the mport on top of the heap. This is necessary when
- * for example, bfd POLL is received and the mport should
- * immediately send FINAL back. */
-void
-ofproto_dpif_monitor_port_send_soon_safe(const struct ofport_dpif *ofport)
-{
- ovs_rwlock_wrlock(&monitor_rwlock);
- ofproto_dpif_monitor_port_send_soon(ofport);
- ovs_rwlock_unlock(&monitor_rwlock);
-}
-
+/* Registers the 'ofport' in the 'send_soon' list. We cannot directly
+ * insert the corresponding mport to the 'send_soon' list, since the
+ * 'send_soon' list is not updated when the mport is removed.
+ *
+ * Reader of the 'send_soon' list is responsible for freeing the entry. */
void
ofproto_dpif_monitor_port_send_soon(const struct ofport_dpif *ofport)
- OVS_REQ_WRLOCK(monitor_rwlock)
{
- struct mport *mport;
+ struct send_soon_entry *entry = xzalloc(sizeof *entry);
+ entry->ofport = ofport;
- mport = mport_find(ofport);
- if (mport) {
- heap_change(&monitor_heap, &mport->heap_node, LLONG_MAX);
- }
+ guarded_list_push_back(&send_soon, &entry->list_node, SIZE_MAX);
}
git://git.onelab.eu / sliver-openvswitch.git / blobdiff