/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=8:tabstop=8:
*
- * Copyright (C) 2002 Cluster File Systems, Inc.
+ * Copyright 2008 Sun Microsystems, Inc. All rights reserved
*
* This file is part of Portals
* http://sourceforge.net/projects/sandiaportals/
static int large_router_buffers = 512;
CFS_MODULE_PARM(large_router_buffers, "i", int, 0444,
"# of large messages to buffer in the router");
+static int peer_buffer_credits = 0;
+CFS_MODULE_PARM(peer_buffer_credits, "i", int, 0444,
+ "# router buffer credits per peer");
static int auto_down = 1;
CFS_MODULE_PARM(auto_down, "i", int, 0444,
"Automatically mark peers down on comms error");
+int
+lnet_peer_buffer_credits(lnet_ni_t *ni)
+{
+ /* NI option overrides LNet default */
+ if (ni->ni_peerrtrcredits > 0)
+ return ni->ni_peerrtrcredits;
+ if (peer_buffer_credits > 0)
+ return peer_buffer_credits;
+
+ /* As an approximation, allow this peer the same number of router
+ * buffers as it is allowed outstanding sends */
+ return ni->ni_peertxcredits;
+}
+
+/* forward ref's */
+static int lnet_router_checker(void *);
+#else
+
+int
+lnet_peer_buffer_credits(lnet_ni_t *ni)
+{
+ return 0;
+}
+
+#endif
+
static int check_routers_before_use = 0;
CFS_MODULE_PARM(check_routers_before_use, "i", int, 0444,
"Assume routers are down and ping them before use");
}
void
-lnet_do_notify (lnet_peer_t *lp)
+lnet_do_notify (lnet_peer_t *lp)
{
lnet_ni_t *ni = lp->lp_ni;
int alive;
int notifylnd;
-
+
LNET_LOCK();
-
+
/* Notify only in 1 thread at any time to ensure ordered notification.
* NB individual events can be missed; the only guarantee is that you
* always get the most recent news */
}
lp->lp_notifying = 1;
-
+
while (lp->lp_notify) {
alive = lp->lp_alive;
notifylnd = lp->lp_notifylnd;
LNET_UNLOCK();
}
-int
-lnet_notify (lnet_ni_t *ni, lnet_nid_t nid, int alive, time_t when)
-{
- lnet_peer_t *lp = NULL;
- time_t now = cfs_time_current_sec();
-
- LASSERT (!in_interrupt ());
-
- CDEBUG (D_NET, "%s notifying %s: %s\n",
- (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
- libcfs_nid2str(nid),
- alive ? "up" : "down");
-
- if (ni != NULL &&
- LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid)) {
- CWARN ("Ignoring notification of %s %s by %s (different net)\n",
- libcfs_nid2str(nid), alive ? "birth" : "death",
- libcfs_nid2str(ni->ni_nid));
- return -EINVAL;
- }
-
- /* can't do predictions... */
- if (when > now) {
- CWARN ("Ignoring prediction from %s of %s %s "
- "%ld seconds in the future\n",
- (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
- libcfs_nid2str(nid), alive ? "up" : "down",
- when - now);
- return -EINVAL;
- }
-
- if (ni != NULL && !alive && /* LND telling me she's down */
- !auto_down) { /* auto-down disabled */
- CDEBUG(D_NET, "Auto-down disabled\n");
- return 0;
- }
-
- LNET_LOCK();
-
- lp = lnet_find_peer_locked(nid);
- if (lp == NULL) {
- /* nid not found */
- LNET_UNLOCK();
- CDEBUG(D_NET, "%s not found\n", libcfs_nid2str(nid));
- return 0;
- }
-
- lnet_notify_locked(lp, ni == NULL, alive, when);
-
- LNET_UNLOCK();
-
- lnet_do_notify(lp);
-
- LNET_LOCK();
-
- lnet_peer_decref_locked(lp);
-
- LNET_UNLOCK();
- return 0;
-}
-EXPORT_SYMBOL(lnet_notify);
-
-#else
-
-int
-lnet_notify (lnet_ni_t *ni, lnet_nid_t nid, int alive, time_t when)
-{
- return -EOPNOTSUPP;
-}
-
-#endif
static void
lnet_rtr_addref_locked(lnet_peer_t *lp)
lnet_add_route (__u32 net, unsigned int hops, lnet_nid_t gateway)
{
struct list_head zombies;
- struct list_head *e;
- lnet_remotenet_t *rnet;
- lnet_remotenet_t *rnet2;
- lnet_route_t *route;
- lnet_route_t *route2;
+ struct list_head *e;
+ lnet_remotenet_t *rnet;
+ lnet_remotenet_t *rnet2;
+ lnet_route_t *route;
+ lnet_route_t *route2;
lnet_ni_t *ni;
int add_route;
int rc;
return -ENOMEM;
}
- INIT_LIST_HEAD(&rnet->lrn_routes);
+ CFS_INIT_LIST_HEAD(&rnet->lrn_routes);
rnet->lrn_net = net;
rnet->lrn_hops = hops;
LASSERT (route2->lr_gateway->lp_nid != gateway);
}
}
-
+
if (add_route) {
ni = route->lr_gateway->lp_ni;
lnet_ni_addref_locked(ni);
-
+
LASSERT (rc == 0);
list_add_tail(&route->lr_list, &rnet2->lrn_routes);
the_lnet.ln_remote_nets_version++;
while (!list_empty(&zombies)) {
route = list_entry(zombies.next, lnet_route_t, lr_list);
list_del(&route->lr_list);
-
+
LNET_LOCK();
+ lnet_rtr_decref_locked(route->lr_gateway);
lnet_peer_decref_locked(route->lr_gateway);
LNET_UNLOCK();
LIBCFS_FREE(route, sizeof(*route));
else if (route->lr_gateway->lp_ni !=
route2->lr_gateway->lp_ni) {
LNET_UNLOCK();
-
+
CERROR("Routes to %s via %s and %s not supported\n",
libcfs_net2str(rnet->lrn_net),
libcfs_nid2str(route->lr_gateway->lp_nid),
}
}
}
-
+
LNET_UNLOCK();
return 0;
}
lnet_get_route (int idx, __u32 *net, __u32 *hops,
lnet_nid_t *gateway, __u32 *alive)
{
- struct list_head *e1;
- struct list_head *e2;
+ struct list_head *e1;
+ struct list_head *e2;
lnet_remotenet_t *rnet;
lnet_route_t *route;
return -ENOENT;
}
-#if defined(__KERNEL__) && defined(LNET_ROUTER)
+void
+lnet_wait_known_routerstate(void)
+{
+ lnet_peer_t *rtr;
+ struct list_head *entry;
+ int all_known;
+
+ LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
+
+ for (;;) {
+ LNET_LOCK();
+
+ all_known = 1;
+ list_for_each (entry, &the_lnet.ln_routers) {
+ rtr = list_entry(entry, lnet_peer_t, lp_rtr_list);
+
+ if (rtr->lp_alive_count == 0) {
+ all_known = 0;
+ break;
+ }
+ }
+
+ LNET_UNLOCK();
+
+ if (all_known)
+ return;
+
+#ifndef __KERNEL__
+ lnet_router_checker();
+#endif
+ cfs_pause(cfs_time_seconds(1));
+ }
+}
+
static void
lnet_router_checker_event (lnet_event_t *event)
{
/* The router checker thread has unlinked the rc_md
* and exited. */
LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_UNLINKING);
- the_lnet.ln_rc_state = LNET_RC_STATE_UNLINKED;
- mutex_up(&the_lnet.ln_rc_signal);
+ the_lnet.ln_rc_state = LNET_RC_STATE_UNLINKED;
+#ifdef __KERNEL__
+ mutex_up(&the_lnet.ln_rc_signal);
+#endif
return;
}
- LASSERT (event->type == LNET_EVENT_SEND ||
+ LASSERT (event->type == LNET_EVENT_SEND ||
event->type == LNET_EVENT_REPLY);
-
+
nid = (event->type == LNET_EVENT_SEND) ?
event->target.nid : event->initiator.nid;
if (lnet_isrouter(lp) && /* ignore if no longer a router */
(event->status != 0 ||
event->type == LNET_EVENT_REPLY)) {
-
+
/* A successful REPLY means the router is up. If _any_ comms
* to the router fail I assume it's down (this will happen if
* we ping alive routers to try to detect router death before
}
static int
-lnet_router_checker(void *arg)
+lnet_router_check_interval (lnet_peer_t *rtr)
{
- static lnet_ping_info_t pinginfo;
-
- int rc;
- lnet_handle_md_t mdh;
- lnet_peer_t *rtr;
- struct list_head *entry;
- time_t now;
- lnet_process_id_t rtr_id;
- int secs;
-
- cfs_daemonize("router_checker");
- cfs_block_allsigs();
+ int secs;
- rtr_id.pid = LUSTRE_SRV_LNET_PID;
+ secs = rtr->lp_alive ? live_router_check_interval :
+ dead_router_check_interval;
+ if (secs < 0)
+ secs = 0;
- LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
-
- rc = LNetMDBind((lnet_md_t){.start = &pinginfo,
- .length = sizeof(pinginfo),
- .threshold = LNET_MD_THRESH_INF,
- .options = LNET_MD_TRUNCATE,
- .eq_handle = the_lnet.ln_rc_eqh},
- LNET_UNLINK,
- &mdh);
-
- if (rc < 0) {
- CERROR("Can't bind MD: %d\n", rc);
- the_lnet.ln_rc_state = rc;
- mutex_up(&the_lnet.ln_rc_signal);
- return rc;
- }
+ return secs;
+}
- LASSERT (rc == 0);
+static void
+lnet_ping_router_locked (lnet_peer_t *rtr)
+{
+ lnet_process_id_t id;
+ int secs;
+ time_t now = cfs_time_current_sec();
- the_lnet.ln_rc_state = LNET_RC_STATE_RUNNING;
- mutex_up(&the_lnet.ln_rc_signal); /* let my parent go */
+ lnet_peer_addref_locked(rtr);
- while (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING) {
- __u64 version;
+ if (rtr->lp_ping_deadline != 0 && /* ping timed out? */
+ now > rtr->lp_ping_deadline)
+ lnet_notify_locked(rtr, 1, 0, now);
- LNET_LOCK();
-rescan:
- version = the_lnet.ln_routers_version;
+ LNET_UNLOCK();
- list_for_each (entry, &the_lnet.ln_routers) {
- rtr = list_entry(entry, lnet_peer_t, lp_rtr_list);
+ /* Run any outstanding notifications */
+ lnet_do_notify(rtr);
- lnet_peer_addref_locked(rtr);
+ LNET_LOCK();
- now = cfs_time_current_sec();
+ secs = lnet_router_check_interval(rtr);
- if (rtr->lp_ping_deadline != 0 && /* ping timed out? */
- now > rtr->lp_ping_deadline)
- lnet_notify_locked(rtr, 1, 0, now);
+ CDEBUG(D_NET,
+ "rtr %s %d: deadline %lu ping_notsent %d alive %d "
+ "alive_count %d lp_ping_timestamp %lu\n",
+ libcfs_nid2str(rtr->lp_nid), secs,
+ rtr->lp_ping_deadline, rtr->lp_ping_notsent,
+ rtr->lp_alive, rtr->lp_alive_count, rtr->lp_ping_timestamp);
- LNET_UNLOCK();
+ if (secs != 0 && !rtr->lp_ping_notsent &&
+ now > rtr->lp_ping_timestamp + secs) {
+ id.nid = rtr->lp_nid;
+ id.pid = LUSTRE_SRV_LNET_PID;
+ CDEBUG(D_NET, "Check: %s\n", libcfs_id2str(id));
- /* Run any outstanding notificiations */
- lnet_do_notify(rtr);
+ rtr->lp_ping_notsent = 1;
+ rtr->lp_ping_timestamp = now;
- if (rtr->lp_alive) {
- secs = live_router_check_interval;
- } else {
- secs = dead_router_check_interval;
- }
- if (secs <= 0)
- secs = 0;
-
- if (secs != 0 &&
- !rtr->lp_ping_notsent &&
- now > rtr->lp_ping_timestamp + secs) {
- CDEBUG(D_NET, "Check: %s\n",
- libcfs_nid2str(rtr->lp_nid));
-
- LNET_LOCK();
- rtr_id.nid = rtr->lp_nid;
- rtr->lp_ping_notsent = 1;
- rtr->lp_ping_timestamp = now;
-
- if (rtr->lp_ping_deadline == 0)
- rtr->lp_ping_deadline =
- now + router_ping_timeout;
+ if (rtr->lp_ping_deadline == 0)
+ rtr->lp_ping_deadline = now + router_ping_timeout;
- LNET_UNLOCK();
+ LNET_UNLOCK();
- LNetGet(LNET_NID_ANY, mdh, rtr_id,
- LNET_RESERVED_PORTAL,
- LNET_PROTO_PING_MATCHBITS, 0);
- }
-
- LNET_LOCK();
- lnet_peer_decref_locked(rtr);
+ LNetGet(LNET_NID_ANY, the_lnet.ln_rc_mdh, id,
+ LNET_RESERVED_PORTAL, LNET_PROTO_PING_MATCHBITS, 0);
- if (version != the_lnet.ln_routers_version) {
- /* the routers list has changed */
- goto rescan;
- }
- }
+ LNET_LOCK();
+ }
- LNET_UNLOCK();
+ lnet_peer_decref_locked(rtr);
+ return;
+}
- /* Call cfs_pause() here always adds 1 to load average
- * because kernel counts # active tasks as nr_running
- * + nr_uninterruptible. */
- set_current_state(CFS_TASK_INTERRUPTIBLE);
- cfs_schedule_timeout(CFS_TASK_INTERRUPTIBLE,
- cfs_time_seconds(1));
- }
+int
+lnet_router_checker_start(void)
+{
+ static lnet_ping_info_t pinginfo;
- LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_STOPTHREAD);
- the_lnet.ln_rc_state = LNET_RC_STATE_UNLINKING;
-
- rc = LNetMDUnlink(mdh);
- LASSERT (rc == 0);
+ lnet_md_t md;
+ int rc;
+ int eqsz;
+#ifndef __KERNEL__
+ lnet_peer_t *rtr;
+ __u64 version;
+ int nrtr = 0;
+ int router_checker_max_eqsize = 10240;
- /* The unlink event callback will signal final completion */
+ LASSERT (check_routers_before_use);
+ LASSERT (dead_router_check_interval > 0);
- return 0;
-}
+ LNET_LOCK();
+ /* As an approximation, allow each router the same number of
+ * outstanding events as it is allowed outstanding sends */
+ eqsz = 0;
+ version = the_lnet.ln_routers_version;
+ list_for_each_entry(rtr, &the_lnet.ln_routers, lp_rtr_list) {
+ lnet_ni_t *ni = rtr->lp_ni;
+ lnet_process_id_t id;
-void
-lnet_wait_known_routerstate(void)
-{
- lnet_peer_t *rtr;
- struct list_head *entry;
- int all_known;
+ nrtr++;
+ eqsz += ni->ni_peertxcredits;
- for (;;) {
- LNET_LOCK();
-
- all_known = 1;
- list_for_each (entry, &the_lnet.ln_routers) {
- rtr = list_entry(entry, lnet_peer_t, lp_rtr_list);
-
- if (rtr->lp_alive_count == 0) {
- all_known = 0;
- break;
- }
- }
+ /* one async ping reply per router */
+ id.nid = rtr->lp_nid;
+ id.pid = LUSTRE_SRV_LNET_PID;
LNET_UNLOCK();
- if (all_known)
- return;
+ rc = LNetSetAsync(id, 1);
+ if (rc != 0) {
+ CWARN("LNetSetAsync %s failed: %d\n",
+ libcfs_id2str(id), rc);
+ return rc;
+ }
- cfs_pause(cfs_time_seconds(1));
+ LNET_LOCK();
+ /* NB router list doesn't change in userspace */
+ LASSERT (version == the_lnet.ln_routers_version);
}
-}
-
-void
-lnet_router_checker_stop(void)
-{
- int rc;
- LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING ||
- the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
-
- if (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN)
- return;
-
- the_lnet.ln_rc_state = LNET_RC_STATE_STOPTHREAD;
- /* block until event callback signals exit */
- mutex_down(&the_lnet.ln_rc_signal);
+ LNET_UNLOCK();
- LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_UNLINKED);
+ if (nrtr == 0) {
+ CDEBUG(D_NET,
+ "No router found, not starting router checker\n");
+ return 0;
+ }
- rc = LNetEQFree(the_lnet.ln_rc_eqh);
- LASSERT (rc == 0);
-
- the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
-}
+ /* at least allow a SENT and a REPLY per router */
+ if (router_checker_max_eqsize < 2 * nrtr)
+ router_checker_max_eqsize = 2 * nrtr;
-int
-lnet_router_checker_start(void)
-{
- int rc;
+ LASSERT (eqsz > 0);
+ if (eqsz > router_checker_max_eqsize)
+ eqsz = router_checker_max_eqsize;
+#endif
LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
"\n");
return -EINVAL;
}
-
+
if (live_router_check_interval <= 0 &&
dead_router_check_interval <= 0)
return 0;
- init_mutex_locked(&the_lnet.ln_rc_signal);
-
+#ifdef __KERNEL__
+ init_mutex_locked(&the_lnet.ln_rc_signal);
/* EQ size doesn't matter; the callback is guaranteed to get every
* event */
- rc = LNetEQAlloc(1, lnet_router_checker_event,
+ eqsz = 1;
+ rc = LNetEQAlloc(eqsz, lnet_router_checker_event,
+ &the_lnet.ln_rc_eqh);
+#else
+ rc = LNetEQAlloc(eqsz, LNET_EQ_HANDLER_NONE,
&the_lnet.ln_rc_eqh);
+#endif
if (rc != 0) {
- CERROR("Can't allocate EQ: %d\n", rc);
+ CERROR("Can't allocate EQ(%d): %d\n", eqsz, rc);
return -ENOMEM;
}
- rc = (int)cfs_kernel_thread(lnet_router_checker, NULL, 0);
- if (rc < 0) {
- CERROR("Can't start router checker thread: %d\n", rc);
- goto failed;
- }
-
- mutex_down(&the_lnet.ln_rc_signal); /* wait for checker to startup */
+ memset(&md, 0, sizeof(md));
+ md.start = &pinginfo;
+ md.length = sizeof(pinginfo);
+ md.options = LNET_MD_TRUNCATE;
+ md.threshold = LNET_MD_THRESH_INF;
+ md.eq_handle = the_lnet.ln_rc_eqh;
+ rc = LNetMDBind(md, LNET_UNLINK, &the_lnet.ln_rc_mdh);
+ if (rc < 0) {
+ CERROR("Can't bind MD: %d\n", rc);
+ rc = LNetEQFree(the_lnet.ln_rc_eqh);
+ LASSERT (rc == 0);
+ return -ENOMEM;
+ }
+ LASSERT (rc == 0);
- rc = the_lnet.ln_rc_state;
+ the_lnet.ln_rc_state = LNET_RC_STATE_RUNNING;
+#ifdef __KERNEL__
+ rc = (int)cfs_kernel_thread(lnet_router_checker, NULL, 0);
if (rc < 0) {
+ CERROR("Can't start router checker thread: %d\n", rc);
+ the_lnet.ln_rc_state = LNET_RC_STATE_UNLINKING;
+ rc = LNetMDUnlink(the_lnet.ln_rc_mdh);
+ LASSERT (rc == 0);
+ /* block until event callback signals exit */
+ mutex_down(&the_lnet.ln_rc_signal);
+ rc = LNetEQFree(the_lnet.ln_rc_eqh);
+ LASSERT (rc == 0);
the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
- goto failed;
+ return -ENOMEM;
}
-
- LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
+#endif
if (check_routers_before_use) {
/* Note that a helpful side-effect of pinging all known routers
* may have to a previous instance of me. */
lnet_wait_known_routerstate();
}
-
+
return 0;
-
- failed:
+}
+
+void
+lnet_router_checker_stop (void)
+{
+ int rc;
+
+ if (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN)
+ return;
+
+ LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
+ the_lnet.ln_rc_state = LNET_RC_STATE_STOPTHREAD;
+
+#ifdef __KERNEL__
+ /* block until event callback signals exit */
+ mutex_down(&the_lnet.ln_rc_signal);
+#else
+ while (the_lnet.ln_rc_state != LNET_RC_STATE_UNLINKED) {
+ lnet_router_checker();
+ cfs_pause(cfs_time_seconds(1));
+ }
+#endif
+ LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_UNLINKED);
+
rc = LNetEQFree(the_lnet.ln_rc_eqh);
LASSERT (rc == 0);
- return rc;
+ the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
+ return;
+}
+
+#if defined(__KERNEL__) && defined(LNET_ROUTER)
+
+static int
+lnet_router_checker(void *arg)
+{
+ int rc;
+ lnet_peer_t *rtr;
+ struct list_head *entry;
+ lnet_process_id_t rtr_id;
+
+ cfs_daemonize("router_checker");
+ cfs_block_allsigs();
+
+ rtr_id.pid = LUSTRE_SRV_LNET_PID;
+
+ LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
+
+ while (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING) {
+ __u64 version;
+
+ LNET_LOCK();
+rescan:
+ version = the_lnet.ln_routers_version;
+
+ list_for_each (entry, &the_lnet.ln_routers) {
+ rtr = list_entry(entry, lnet_peer_t, lp_rtr_list);
+ lnet_ping_router_locked(rtr);
+
+ /* NB dropped lock */
+ if (version != the_lnet.ln_routers_version) {
+ /* the routers list has changed */
+ goto rescan;
+ }
+ }
+
+ LNET_UNLOCK();
+
+ /* Call cfs_pause() here always adds 1 to load average
+ * because kernel counts # active tasks as nr_running
+ * + nr_uninterruptible. */
+ cfs_schedule_timeout(CFS_TASK_INTERRUPTIBLE,
+ cfs_time_seconds(1));
+ }
+
+ LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_STOPTHREAD);
+ the_lnet.ln_rc_state = LNET_RC_STATE_UNLINKING;
+
+ rc = LNetMDUnlink(the_lnet.ln_rc_mdh);
+ LASSERT (rc == 0);
+
+ /* The unlink event callback will signal final completion */
+ return 0;
}
void
LASSERT (rbp->rbp_nbuffers == nbufs);
return 0;
}
-
+
for (i = 0; i < nbufs; i++) {
rb = lnet_new_rtrbuf(rbp);
lnet_alloc_rtrpools(int im_a_router)
{
int rc;
-
+
if (!strcmp(forwarding, "")) {
/* not set either way */
if (!im_a_router)
"'enabled' or 'disabled'\n");
return -EINVAL;
}
-
+
if (tiny_router_buffers <= 0) {
LCONSOLE_ERROR_MSG(0x10c, "tiny_router_buffers=%d invalid when "
"routing enabled\n", tiny_router_buffers);
LNET_LOCK();
the_lnet.ln_routing = 1;
LNET_UNLOCK();
-
+
return 0;
failed:
return rc;
}
-#else
-
int
-lnet_peers_start_down(void)
+lnet_notify (lnet_ni_t *ni, lnet_nid_t nid, int alive, time_t when)
{
+ lnet_peer_t *lp = NULL;
+ time_t now = cfs_time_current_sec();
+
+ LASSERT (!in_interrupt ());
+
+ CDEBUG (D_NET, "%s notifying %s: %s\n",
+ (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
+ libcfs_nid2str(nid),
+ alive ? "up" : "down");
+
+ if (ni != NULL &&
+ LNET_NIDNET(ni->ni_nid) != LNET_NIDNET(nid)) {
+ CWARN ("Ignoring notification of %s %s by %s (different net)\n",
+ libcfs_nid2str(nid), alive ? "birth" : "death",
+ libcfs_nid2str(ni->ni_nid));
+ return -EINVAL;
+ }
+
+ /* can't do predictions... */
+ if (when > now) {
+ CWARN ("Ignoring prediction from %s of %s %s "
+ "%ld seconds in the future\n",
+ (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid),
+ libcfs_nid2str(nid), alive ? "up" : "down",
+ when - now);
+ return -EINVAL;
+ }
+
+ if (ni != NULL && !alive && /* LND telling me she's down */
+ !auto_down) { /* auto-down disabled */
+ CDEBUG(D_NET, "Auto-down disabled\n");
+ return 0;
+ }
+
+ LNET_LOCK();
+
+ lp = lnet_find_peer_locked(nid);
+ if (lp == NULL) {
+ /* nid not found */
+ LNET_UNLOCK();
+ CDEBUG(D_NET, "%s not found\n", libcfs_nid2str(nid));
+ return 0;
+ }
+
+ /* We can't fully trust LND on reporting exact peer last_alive
+ * if he notifies us about dead peer. For example ksocklnd can
+ * call us with when == _time_when_the_node_was_booted_ if
+ * no connections were successfully established */
+ if (ni != NULL && !alive && when < lp->lp_last_alive)
+ when = lp->lp_last_alive;
+
+ lnet_notify_locked(lp, ni == NULL, alive, when);
+
+ LNET_UNLOCK();
+
+ lnet_do_notify(lp);
+
+ LNET_LOCK();
+
+ lnet_peer_decref_locked(lp);
+
+ LNET_UNLOCK();
return 0;
}
+EXPORT_SYMBOL(lnet_notify);
void
-lnet_router_checker_stop(void)
+lnet_get_tunables (void)
{
return;
}
+#else
+
int
-lnet_router_checker_start(void)
+lnet_notify (lnet_ni_t *ni, lnet_nid_t nid, int alive, time_t when)
{
- return 0;
+ return -EOPNOTSUPP;
+}
+
+void
+lnet_router_checker (void)
+{
+ static time_t last = 0;
+ static int running = 0;
+
+ time_t now = cfs_time_current_sec();
+ int interval = now - last;
+ int rc;
+ __u64 version;
+ lnet_peer_t *rtr;
+
+ /* It's no use to call me again within a sec - all intervals and
+ * timeouts are measured in seconds */
+ if (last != 0 && interval < 2)
+ return;
+
+ if (last != 0 &&
+ interval > MAX(live_router_check_interval,
+ dead_router_check_interval))
+ CDEBUG(D_NETERROR, "Checker(%d/%d) not called for %d seconds\n",
+ live_router_check_interval, dead_router_check_interval,
+ interval);
+
+ LNET_LOCK();
+ LASSERT (!running); /* recursion check */
+ running = 1;
+ LNET_UNLOCK();
+
+ last = now;
+
+ if (the_lnet.ln_rc_state == LNET_RC_STATE_STOPTHREAD) {
+ the_lnet.ln_rc_state = LNET_RC_STATE_UNLINKING;
+ rc = LNetMDUnlink(the_lnet.ln_rc_mdh);
+ LASSERT (rc == 0);
+ }
+
+ /* consume all pending events */
+ while (1) {
+ int i;
+ lnet_event_t ev;
+
+ /* NB ln_rc_eqh must be the 1st in 'eventqs' otherwise the
+ * recursion breaker in LNetEQPoll would fail */
+ rc = LNetEQPoll(&the_lnet.ln_rc_eqh, 1, 0, &ev, &i);
+ if (rc == 0) /* no event pending */
+ break;
+
+ /* NB a lost SENT prevents me from pinging a router again */
+ if (rc == -EOVERFLOW) {
+ CERROR("Dropped an event!!!\n");
+ abort();
+ }
+
+ LASSERT (rc == 1);
+
+ LNET_LOCK();
+ lnet_router_checker_event(&ev);
+ LNET_UNLOCK();
+ }
+
+ if (the_lnet.ln_rc_state == LNET_RC_STATE_UNLINKED ||
+ the_lnet.ln_rc_state == LNET_RC_STATE_UNLINKING) {
+ running = 0;
+ return;
+ }
+
+ LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
+
+ LNET_LOCK();
+
+ version = the_lnet.ln_routers_version;
+ list_for_each_entry (rtr, &the_lnet.ln_routers, lp_rtr_list) {
+ lnet_ping_router_locked(rtr);
+ LASSERT (version == the_lnet.ln_routers_version);
+ }
+
+ LNET_UNLOCK();
+
+ running = 0; /* lock only needed for the recursion check */
+ return;
+}
+
+/* NB lnet_peers_start_down depends on me,
+ * so must be called before any peer creation */
+void
+lnet_get_tunables (void)
+{
+ char *s;
+
+ s = getenv("LNET_ROUTER_PING_TIMEOUT");
+ if (s != NULL) router_ping_timeout = atoi(s);
+
+ s = getenv("LNET_LIVE_ROUTER_CHECK_INTERVAL");
+ if (s != NULL) live_router_check_interval = atoi(s);
+
+ s = getenv("LNET_DEAD_ROUTER_CHECK_INTERVAL");
+ if (s != NULL) dead_router_check_interval = atoi(s);
+
+ /* This replaces old lnd_notify mechanism */
+ check_routers_before_use = 1;
+ if (dead_router_check_interval <= 0)
+ dead_router_check_interval = 30;
}
void
git://git.whamcloud.com / fs / lustre-release.git / blobdiff