-/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
- * vim:expandtab:shiftwidth=8:tabstop=8:
+/*
+ * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
*
- * Copyright (C) 2002 Cluster File Systems, Inc.
+ * Copyright (c) 2011, Whamcloud, Inc.
*
* This file is part of Portals
* http://sourceforge.net/projects/sandiaportals/
CFS_MODULE_PARM(forwarding, "s", charp, 0444,
"Explicitly enable/disable forwarding between networks");
-static int tiny_router_buffers = 512;
+static int tiny_router_buffers = 1024;
CFS_MODULE_PARM(tiny_router_buffers, "i", int, 0444,
"# of 0 payload messages to buffer in the router");
-static int small_router_buffers = 256;
+static int small_router_buffers = 8192;
CFS_MODULE_PARM(small_router_buffers, "i", int, 0444,
"# of small (1 page) messages to buffer in the router");
-static int large_router_buffers = 32;
+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");
+static int avoid_asym_router_failure = 0;
+CFS_MODULE_PARM(avoid_asym_router_failure, "i", int, 0444,
+ "Avoid asymmetrical failures: reserved, use at your own risk");
+
static int dead_router_check_interval = 0;
CFS_MODULE_PARM(dead_router_check_interval, "i", int, 0444,
"Seconds between dead router health checks (<= 0 to disable)");
}
void
-lnet_notify_locked(lnet_peer_t *lp, int notifylnd, int alive, time_t when)
+lnet_notify_locked(lnet_peer_t *lp, int notifylnd, int alive, cfs_time_t when)
{
- if (when < lp->lp_timestamp) { /* out of date information */
+ if (cfs_time_before(when, lp->lp_timestamp)) { /* out of date information */
CDEBUG(D_NET, "Out of date\n");
return;
}
}
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)
lp->lp_rtr_refcount++;
if (lp->lp_rtr_refcount == 1) {
- struct list_head *pos;
+ cfs_list_t *pos;
/* a simple insertion sort */
- list_for_each_prev(pos, &the_lnet.ln_routers) {
- lnet_peer_t *rtr = list_entry(pos, lnet_peer_t,
- lp_rtr_list);
+ cfs_list_for_each_prev(pos, &the_lnet.ln_routers) {
+ lnet_peer_t *rtr = cfs_list_entry(pos, lnet_peer_t,
+ lp_rtr_list);
if (rtr->lp_nid < lp->lp_nid)
break;
}
- list_add(&lp->lp_rtr_list, pos);
+ cfs_list_add(&lp->lp_rtr_list, pos);
/* addref for the_lnet.ln_routers */
lnet_peer_addref_locked(lp);
the_lnet.ln_routers_version++;
lp->lp_rtr_refcount--;
if (lp->lp_rtr_refcount == 0) {
- list_del(&lp->lp_rtr_list);
+ if (lp->lp_rcd != NULL) {
+ cfs_list_add(&lp->lp_rcd->rcd_list,
+ &the_lnet.ln_zombie_rcd);
+ lp->lp_rcd = NULL;
+ }
+
+ cfs_list_del(&lp->lp_rtr_list);
/* decref for the_lnet.ln_routers */
lnet_peer_decref_locked(lp);
the_lnet.ln_routers_version++;
lnet_find_net_locked (__u32 net)
{
lnet_remotenet_t *rnet;
- struct list_head *tmp;
+ cfs_list_t *tmp;
LASSERT (!the_lnet.ln_shutdown);
- list_for_each (tmp, &the_lnet.ln_remote_nets) {
- rnet = list_entry(tmp, lnet_remotenet_t, lrn_list);
+ cfs_list_for_each (tmp, &the_lnet.ln_remote_nets) {
+ rnet = cfs_list_entry(tmp, lnet_remotenet_t, lrn_list);
if (rnet->lrn_net == net)
return rnet;
return NULL;
}
+static void lnet_shuffle_seed(void)
+{
+ static int seeded = 0;
+ int lnd_type, seed[2];
+ struct timeval tv;
+ lnet_ni_t *ni;
+ cfs_list_t *tmp;
+
+ if (seeded)
+ return;
+
+ cfs_get_random_bytes(seed, sizeof(seed));
+
+ /* Nodes with small feet have little entropy
+ * the NID for this node gives the most entropy in the low bits */
+ cfs_list_for_each(tmp, &the_lnet.ln_nis) {
+ ni = cfs_list_entry(tmp, lnet_ni_t, ni_list);
+ lnd_type = LNET_NETTYP(LNET_NIDNET(ni->ni_nid));
+
+ if (lnd_type != LOLND)
+ seed[0] ^= (LNET_NIDADDR(ni->ni_nid) | lnd_type);
+ }
+
+ cfs_gettimeofday(&tv);
+ cfs_srand(tv.tv_sec ^ seed[0], tv.tv_usec ^ seed[1]);
+ seeded = 1;
+ return;
+}
+
+/* NB expects LNET_LOCK held */
+void
+lnet_add_route_to_rnet (lnet_remotenet_t *rnet, lnet_route_t *route)
+{
+ unsigned int len = 0;
+ unsigned int offset = 0;
+ cfs_list_t *e;
+
+ lnet_shuffle_seed();
+
+ cfs_list_for_each (e, &rnet->lrn_routes) {
+ len++;
+ }
+
+ /* len+1 positions to add a new entry, also prevents division by 0 */
+ offset = cfs_rand() % (len + 1);
+ cfs_list_for_each (e, &rnet->lrn_routes) {
+ if (offset == 0)
+ break;
+ offset--;
+ }
+ cfs_list_add(&route->lr_list, e);
+
+ the_lnet.ln_remote_nets_version++;
+ lnet_rtr_addref_locked(route->lr_gateway);
+}
+
int
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;
+ cfs_list_t *e;
+ lnet_remotenet_t *rnet;
+ lnet_remotenet_t *rnet2;
+ lnet_route_t *route;
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;
+ route->lr_hops = hops;
LNET_LOCK();
}
LASSERT (!the_lnet.ln_shutdown);
- CFS_INIT_LIST_HEAD(&zombies);
rnet2 = lnet_find_net_locked(net);
if (rnet2 == NULL) {
/* new network */
- list_add_tail(&rnet->lrn_list, &the_lnet.ln_remote_nets);
+ cfs_list_add_tail(&rnet->lrn_list, &the_lnet.ln_remote_nets);
rnet2 = rnet;
}
- if (hops > rnet2->lrn_hops) {
- /* New route is longer; ignore it */
- add_route = 0;
- } else if (hops < rnet2->lrn_hops) {
- /* new route supercedes all currently known routes to this
- * net */
- list_add(&zombies, &rnet2->lrn_routes);
- list_del_init(&rnet2->lrn_routes);
- add_route = 1;
- } else {
- add_route = 1;
- /* New route has the same hopcount as existing routes; search
- * for a duplicate route (it's a NOOP if it is) */
- list_for_each (e, &rnet2->lrn_routes) {
- route2 = list_entry(e, lnet_route_t, lr_list);
-
- if (route2->lr_gateway == route->lr_gateway) {
- add_route = 0;
- break;
- }
+ /* Search for a duplicate route (it's a NOOP if it is) */
+ add_route = 1;
+ cfs_list_for_each (e, &rnet2->lrn_routes) {
+ lnet_route_t *route2 = cfs_list_entry(e, lnet_route_t, lr_list);
- /* our loopups must be true */
- LASSERT (route2->lr_gateway->lp_nid != gateway);
+ if (route2->lr_gateway == route->lr_gateway) {
+ add_route = 0;
+ break;
}
+
+ /* our lookups must be true */
+ 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++;
-
- lnet_rtr_addref_locked(route->lr_gateway);
+ lnet_add_route_to_rnet(rnet2, route);
LNET_UNLOCK();
/* XXX Assume alive */
if (rnet != rnet2)
LIBCFS_FREE(rnet, sizeof(*rnet));
- while (!list_empty(&zombies)) {
- route = list_entry(zombies.next, lnet_route_t, lr_list);
- list_del(&route->lr_list);
-
- LNET_LOCK();
- lnet_peer_decref_locked(route->lr_gateway);
- LNET_UNLOCK();
- LIBCFS_FREE(route, sizeof(*route));
- }
-
- return rc;
+ return 0;
}
int
lnet_remotenet_t *rnet;
lnet_route_t *route;
lnet_route_t *route2;
- struct list_head *e1;
- struct list_head *e2;
+ cfs_list_t *e1;
+ cfs_list_t *e2;
LNET_LOCK();
- list_for_each (e1, &the_lnet.ln_remote_nets) {
- rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
+ cfs_list_for_each (e1, &the_lnet.ln_remote_nets) {
+ rnet = cfs_list_entry(e1, lnet_remotenet_t, lrn_list);
route2 = NULL;
- list_for_each (e2, &rnet->lrn_routes) {
- route = list_entry(e2, lnet_route_t, lr_list);
+ cfs_list_for_each (e2, &rnet->lrn_routes) {
+ route = cfs_list_entry(e2, lnet_route_t, lr_list);
if (route2 == NULL)
route2 = 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_remotenet_t *rnet;
lnet_route_t *route;
- struct list_head *e1;
- struct list_head *e2;
+ cfs_list_t *e1;
+ cfs_list_t *e2;
int rc = -ENOENT;
CDEBUG(D_NET, "Del route: net %s : gw %s\n",
again:
LNET_LOCK();
- list_for_each (e1, &the_lnet.ln_remote_nets) {
- rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
+ cfs_list_for_each (e1, &the_lnet.ln_remote_nets) {
+ rnet = cfs_list_entry(e1, lnet_remotenet_t, lrn_list);
if (!(net == LNET_NIDNET(LNET_NID_ANY) ||
net == rnet->lrn_net))
continue;
- list_for_each (e2, &rnet->lrn_routes) {
- route = list_entry(e2, lnet_route_t, lr_list);
+ cfs_list_for_each (e2, &rnet->lrn_routes) {
+ route = cfs_list_entry(e2, lnet_route_t, lr_list);
if (!(gw_nid == LNET_NID_ANY ||
gw_nid == route->lr_gateway->lp_nid))
continue;
- list_del(&route->lr_list);
+ cfs_list_del(&route->lr_list);
the_lnet.ln_remote_nets_version++;
- if (list_empty(&rnet->lrn_routes))
- list_del(&rnet->lrn_list);
+ if (cfs_list_empty(&rnet->lrn_routes))
+ cfs_list_del(&rnet->lrn_list);
else
rnet = NULL;
lnet_get_route (int idx, __u32 *net, __u32 *hops,
lnet_nid_t *gateway, __u32 *alive)
{
- struct list_head *e1;
- struct list_head *e2;
+ cfs_list_t *e1;
+ cfs_list_t *e2;
lnet_remotenet_t *rnet;
lnet_route_t *route;
LNET_LOCK();
- list_for_each (e1, &the_lnet.ln_remote_nets) {
- rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
+ cfs_list_for_each (e1, &the_lnet.ln_remote_nets) {
+ rnet = cfs_list_entry(e1, lnet_remotenet_t, lrn_list);
- list_for_each (e2, &rnet->lrn_routes) {
- route = list_entry(e2, lnet_route_t, lr_list);
+ cfs_list_for_each (e2, &rnet->lrn_routes) {
+ route = cfs_list_entry(e2, lnet_route_t, lr_list);
if (idx-- == 0) {
*net = rnet->lrn_net;
- *hops = rnet->lrn_hops;
+ *hops = route->lr_hops;
*gateway = route->lr_gateway->lp_nid;
*alive = route->lr_gateway->lp_alive;
LNET_UNLOCK();
return -ENOENT;
}
-#if defined(__KERNEL__) && defined(LNET_ROUTER)
+void
+lnet_swap_pinginfo(lnet_ping_info_t *info)
+{
+ int i;
+ lnet_ni_status_t *stat;
+
+ __swab32s(&info->pi_version);
+ __swab32s(&info->pi_pid);
+ __swab32s(&info->pi_nnis);
+ for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
+ stat = &info->pi_ni[i];
+ __swab64s(&stat->ns_nid);
+ __swab32s(&stat->ns_status);
+ }
+ return;
+}
+
+/* Returns # of down NIs, or negative error codes; ignore downed NIs
+ * if a NI in 'net' is up */
+int
+lnet_router_down_ni(lnet_peer_t *rtr, __u32 net)
+{
+ int i;
+ int down = 0;
+ int ptl_up = 0;
+ int ptl_down = 0;
+ lnet_ping_info_t *info;
+
+ if (!avoid_asym_router_failure)
+ return -ENOENT;
+
+ if (rtr->lp_rcd == NULL)
+ return -EINVAL;
+
+ if (!rtr->lp_alive)
+ return -EINVAL; /* stale lp_rcd */
+
+ info = rtr->lp_rcd->rcd_pinginfo;
+ LASSERT (info != NULL);
+
+ /* NB always racing with network! */
+ if (info->pi_magic == __swab32(LNET_PROTO_PING_MAGIC)) {
+ lnet_swap_pinginfo(info);
+ } else if (info->pi_magic != LNET_PROTO_PING_MAGIC) {
+ CNETERR("%s: Unexpected magic %08x\n",
+ libcfs_nid2str(rtr->lp_nid), info->pi_magic);
+ return -EPROTO;
+ }
+
+ if (info->pi_version == LNET_PROTO_PING_VERSION1)
+ return -ENOENT; /* v1 doesn't carry NI status info */
+
+ if (info->pi_version != LNET_PROTO_PING_VERSION) {
+ CNETERR("%s: Unexpected version 0x%x\n",
+ libcfs_nid2str(rtr->lp_nid), info->pi_version);
+ return -EPROTO;
+ }
+
+ for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
+ lnet_ni_status_t *stat = &info->pi_ni[i];
+ lnet_nid_t nid = stat->ns_nid;
+
+ if (nid == LNET_NID_ANY) {
+ CNETERR("%s: unexpected LNET_NID_ANY\n",
+ libcfs_nid2str(rtr->lp_nid));
+ return -EPROTO;
+ }
+
+ if (LNET_NETTYP(LNET_NIDNET(nid)) == LOLND)
+ continue;
+
+ if (stat->ns_status == LNET_NI_STATUS_DOWN) {
+ if (LNET_NETTYP(LNET_NIDNET(nid)) == PTLLND)
+ ptl_down = 1;
+ else
+ down++;
+ continue;
+ }
+
+ if (stat->ns_status != LNET_NI_STATUS_UP) {
+ CNETERR("%s: Unexpected status 0x%x\n",
+ libcfs_nid2str(rtr->lp_nid), stat->ns_status);
+ return -EPROTO;
+ }
+
+ /* ignore downed NIs if there's a NI up for dest network */
+ if (LNET_NIDNET(nid) == net)
+ return 0;
+
+ if (LNET_NETTYP(LNET_NIDNET(nid)) == PTLLND)
+ ptl_up = 1;
+ }
+
+ /* ptl NIs are considered down only when they're all down */
+ return down + (ptl_up ? 0 : ptl_down);
+}
+
+void
+lnet_wait_known_routerstate(void)
+{
+ lnet_peer_t *rtr;
+ cfs_list_t *entry;
+ int all_known;
+
+ LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
+
+ for (;;) {
+ LNET_LOCK();
+
+ all_known = 1;
+ cfs_list_for_each (entry, &the_lnet.ln_routers) {
+ rtr = cfs_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)
{
/* CAVEAT EMPTOR: I'm called with LNET_LOCKed and I'm not allowed to
* drop it (that's how come I see _every_ event, even ones that would
* overflow my EQ) */
- lnet_peer_t *lp;
- lnet_nid_t nid;
+ lnet_rc_data_t *rcd = event->md.user_ptr;
+ lnet_peer_t *lp;
+ lnet_nid_t nid;
if (event->unlinked) {
- /* The router checker thread has unlinked the rc_md
+ if (rcd != NULL) {
+ LNetInvalidateHandle(&rcd->rcd_mdh);
+ return;
+ }
+
+ /* The router checker thread has unlinked the default 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__
+ cfs_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
* apps get burned). */
lnet_notify_locked(lp, 1, (event->status == 0),
- cfs_time_current_sec());
+ cfs_time_current());
/* The router checker will wake up very shortly and do the
* actual notification.
lnet_peer_decref_locked(lp);
}
-static int
-lnet_router_checker(void *arg)
+void
+lnet_update_ni_status(void)
{
- static lnet_ping_info_t pinginfo;
+ cfs_time_t now = cfs_time_current();
+ lnet_ni_t *ni;
+ int status;
+ int timeout;
- 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;
+ LASSERT (the_lnet.ln_routing);
+
+ timeout = router_ping_timeout +
+ MAX(live_router_check_interval, dead_router_check_interval);
- cfs_daemonize("router_checker");
- cfs_block_allsigs();
+ LNET_LOCK();
- rtr_id.pid = LUSTRE_SRV_LNET_PID;
+ cfs_list_for_each_entry (ni, &the_lnet.ln_nis, ni_list) {
+ lnet_ni_status_t *ns = ni->ni_status;
- LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
+ LASSERT (ns != NULL);
+
+ status = LNET_NI_STATUS_UP;
+ if (ni->ni_lnd->lnd_type != LOLND && /* @lo forever alive */
+ cfs_time_after(now, cfs_time_add(ni->ni_last_alive,
+ cfs_time_seconds(timeout))))
+ status = LNET_NI_STATUS_DOWN;
+
+ if (ns->ns_status != status) {
+ ns->ns_status = status;
+ CDEBUG(D_NET, "NI(%s:%d) status changed to %s\n",
+ libcfs_nid2str(ni->ni_nid), timeout,
+ status == LNET_NI_STATUS_UP ? "up" : "down");
+ }
+ }
+
+ LNET_UNLOCK();
+}
+
+void
+lnet_destroy_rc_data (lnet_rc_data_t *rcd)
+{
+ LASSERT (cfs_list_empty(&rcd->rcd_list));
+ /* detached from network */
+ LASSERT (LNetHandleIsInvalid(rcd->rcd_mdh));
+
+ LIBCFS_FREE(rcd->rcd_pinginfo, LNET_PINGINFO_SIZE);
+ LIBCFS_FREE(rcd, sizeof(*rcd));
+ return;
+}
+
+lnet_rc_data_t *
+lnet_create_rc_data (void)
+{
+ int i;
+ int rc;
+ lnet_ping_info_t *pi;
+ lnet_rc_data_t *rcd;
+
+ LIBCFS_ALLOC(rcd, sizeof(*rcd));
+ if (rcd == NULL)
+ return NULL;
+
+ LIBCFS_ALLOC(pi, LNET_PINGINFO_SIZE);
+ if (pi == NULL) {
+ LIBCFS_FREE(rcd, sizeof(*rcd));
+ return NULL;
+ }
- rc = LNetMDBind((lnet_md_t){.start = &pinginfo,
- .length = sizeof(pinginfo),
+ memset(pi, 0, LNET_PINGINFO_SIZE);
+ for (i = 0; i < LNET_MAX_RTR_NIS; i++) {
+ pi->pi_ni[i].ns_nid = LNET_NID_ANY;
+ pi->pi_ni[i].ns_status = LNET_NI_STATUS_INVALID;
+ }
+ rcd->rcd_pinginfo = pi;
+ LNetInvalidateHandle(&rcd->rcd_mdh);
+ CFS_INIT_LIST_HEAD(&rcd->rcd_list);
+
+ LASSERT (!LNetHandleIsInvalid(the_lnet.ln_rc_eqh));
+ rc = LNetMDBind((lnet_md_t){.start = pi,
+ .user_ptr = rcd,
+ .length = LNET_PINGINFO_SIZE,
.threshold = LNET_MD_THRESH_INF,
.options = LNET_MD_TRUNCATE,
.eq_handle = the_lnet.ln_rc_eqh},
LNET_UNLINK,
- &mdh);
-
+ &rcd->rcd_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;
+ lnet_destroy_rc_data(rcd);
+ return NULL;
}
-
LASSERT (rc == 0);
+ return rcd;
+}
- the_lnet.ln_rc_state = LNET_RC_STATE_RUNNING;
- mutex_up(&the_lnet.ln_rc_signal); /* let my parent go */
+static int
+lnet_router_check_interval (lnet_peer_t *rtr)
+{
+ int secs;
- while (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING) {
- __u64 version;
+ secs = rtr->lp_alive ? live_router_check_interval :
+ dead_router_check_interval;
+ if (secs < 0)
+ secs = 0;
- LNET_LOCK();
-rescan:
- version = the_lnet.ln_routers_version;
+ return secs;
+}
- list_for_each (entry, &the_lnet.ln_routers) {
- rtr = list_entry(entry, lnet_peer_t, lp_rtr_list);
+static void
+lnet_ping_router_locked (lnet_peer_t *rtr)
+{
+ int newrcd = 0;
+ lnet_rc_data_t *rcd = NULL;
+ cfs_time_t now = cfs_time_current();
+ int secs;
- lnet_peer_addref_locked(rtr);
+ lnet_peer_addref_locked(rtr);
- now = cfs_time_current_sec();
+ if (rtr->lp_ping_deadline != 0 && /* ping timed out? */
+ cfs_time_after(now, rtr->lp_ping_deadline))
+ lnet_notify_locked(rtr, 1, 0, now);
- if (rtr->lp_ping_deadline != 0 && /* ping timed out? */
- now > rtr->lp_ping_deadline)
- lnet_notify_locked(rtr, 1, 0, now);
+ if (avoid_asym_router_failure && rtr->lp_rcd == NULL)
+ newrcd = 1;
- LNET_UNLOCK();
+ LNET_UNLOCK();
- /* Run any outstanding notificiations */
- lnet_do_notify(rtr);
+ /* Run any outstanding notifications */
+ lnet_do_notify(rtr);
- 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 (newrcd)
+ rcd = lnet_create_rc_data();
- LNET_UNLOCK();
+ LNET_LOCK();
- LNetGet(LNET_NID_ANY, mdh, rtr_id,
- LNET_RESERVED_PORTAL,
- LNET_PROTO_PING_MATCHBITS, 0);
- }
-
- LNET_LOCK();
- lnet_peer_decref_locked(rtr);
+ if (!lnet_isrouter(rtr)) {
+ lnet_peer_decref_locked(rtr);
+ if (rcd != NULL)
+ cfs_list_add(&rcd->rcd_list, &the_lnet.ln_zombie_rcd);
+ return; /* router table changed! */
+ }
- if (version != the_lnet.ln_routers_version) {
- /* the routers list has changed */
- goto rescan;
- }
- }
+ if (rcd != NULL) {
+ LASSERT (rtr->lp_rcd == NULL);
+ rtr->lp_rcd = rcd;
+ }
- LNET_UNLOCK();
+ secs = lnet_router_check_interval(rtr);
- /* 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));
- }
+ 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);
- 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);
+ if (secs != 0 && !rtr->lp_ping_notsent &&
+ cfs_time_after(now, cfs_time_add(rtr->lp_ping_timestamp,
+ cfs_time_seconds(secs)))) {
+ int rc;
+ lnet_process_id_t id;
+ lnet_handle_md_t mdh;
- /* The unlink event callback will signal final completion */
+ id.nid = rtr->lp_nid;
+ id.pid = LUSTRE_SRV_LNET_PID;
+ CDEBUG(D_NET, "Check: %s\n", libcfs_id2str(id));
- return 0;
-}
+ rtr->lp_ping_notsent = 1;
+ rtr->lp_ping_timestamp = now;
+ mdh = (rtr->lp_rcd == NULL) ? the_lnet.ln_rc_mdh :
+ rtr->lp_rcd->rcd_mdh;
-
-void
-lnet_wait_known_routerstate(void)
-{
- lnet_peer_t *rtr;
- struct list_head *entry;
- int all_known;
-
- 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;
- }
- }
+ if (rtr->lp_ping_deadline == 0)
+ rtr->lp_ping_deadline = cfs_time_shift(router_ping_timeout);
LNET_UNLOCK();
- if (all_known)
- return;
+ rc = LNetGet(LNET_NID_ANY, mdh, id, LNET_RESERVED_PORTAL,
+ LNET_PROTO_PING_MATCHBITS, 0);
- cfs_pause(cfs_time_seconds(1));
+ LNET_LOCK();
+ if (rc != 0)
+ rtr->lp_ping_notsent = 0; /* no event pending */
}
+
+ lnet_peer_decref_locked(rtr);
+ return;
}
-void
-lnet_router_checker_stop(void)
+int
+lnet_router_checker_start(void)
{
- int rc;
+ static lnet_ping_info_t pinginfo;
- LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING ||
- the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
+ 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;
- if (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN)
- return;
+ LASSERT (check_routers_before_use);
+ LASSERT (dead_router_check_interval > 0);
- the_lnet.ln_rc_state = LNET_RC_STATE_STOPTHREAD;
- /* block until event callback signals exit */
- mutex_down(&the_lnet.ln_rc_signal);
+ LNET_LOCK();
- LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_UNLINKED);
+ /* 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;
+ cfs_list_for_each_entry(rtr, &the_lnet.ln_routers, lp_rtr_list) {
+ lnet_ni_t *ni = rtr->lp_ni;
+ lnet_process_id_t id;
- rc = LNetEQFree(the_lnet.ln_rc_eqh);
- LASSERT (rc == 0);
-
- the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
-}
+ nrtr++;
+ eqsz += ni->ni_peertxcredits;
-int
-lnet_router_checker_start(void)
-{
- int rc;
+ /* one async ping reply per router */
+ id.nid = rtr->lp_nid;
+ id.pid = LUSTRE_SRV_LNET_PID;
+
+ LNET_UNLOCK();
+
+ rc = LNetSetAsync(id, 1);
+ if (rc != 0) {
+ CWARN("LNetSetAsync %s failed: %d\n",
+ libcfs_id2str(id), rc);
+ return rc;
+ }
+
+ LNET_LOCK();
+ /* NB router list doesn't change in userspace */
+ LASSERT (version == the_lnet.ln_routers_version);
+ }
+
+ LNET_UNLOCK();
+
+ if (nrtr == 0) {
+ CDEBUG(D_NET,
+ "No router found, not starting router checker\n");
+ return 0;
+ }
+
+ /* at least allow a SENT and a REPLY per router */
+ if (router_checker_max_eqsize < 2 * nrtr)
+ router_checker_max_eqsize = 2 * nrtr;
+
+ 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 &&
+
+ if (!the_lnet.ln_routing &&
+ live_router_check_interval <= 0 &&
dead_router_check_interval <= 0)
return 0;
- init_mutex_locked(&the_lnet.ln_rc_signal);
-
+#ifdef __KERNEL__
+ cfs_sema_init(&the_lnet.ln_rc_signal, 0);
/* EQ size doesn't matter; the callback is guaranteed to get every
* event */
- rc = LNetEQAlloc(1, lnet_router_checker_event,
+ eqsz = 0;
+ 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.user_ptr = NULL;
+ 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 = cfs_create_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 */
+ cfs_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 */
+ cfs_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 void
+lnet_prune_zombie_rcd (int wait_unlink)
+{
+ lnet_rc_data_t *rcd;
+ lnet_rc_data_t *tmp;
+ cfs_list_t free_rcd;
+ int i;
+ __u64 version;
+
+ CFS_INIT_LIST_HEAD(&free_rcd);
+
+ LNET_LOCK();
+rescan:
+ version = the_lnet.ln_routers_version;
+ cfs_list_for_each_entry_safe (rcd, tmp, &the_lnet.ln_zombie_rcd,
+ rcd_list) {
+ if (LNetHandleIsInvalid(rcd->rcd_mdh)) {
+ cfs_list_del(&rcd->rcd_list);
+ cfs_list_add(&rcd->rcd_list, &free_rcd);
+ continue;
+ }
+
+ LNET_UNLOCK();
+
+ LNetMDUnlink(rcd->rcd_mdh);
+
+ LNET_LOCK();
+ if (version != the_lnet.ln_routers_version)
+ goto rescan;
+ }
+
+ i = 2;
+ while (wait_unlink && !cfs_list_empty(&the_lnet.ln_zombie_rcd)) {
+ rcd = cfs_list_entry(the_lnet.ln_zombie_rcd.next,
+ lnet_rc_data_t, rcd_list);
+ if (LNetHandleIsInvalid(rcd->rcd_mdh)) {
+ cfs_list_del(&rcd->rcd_list);
+ cfs_list_add(&rcd->rcd_list, &free_rcd);
+ continue;
+ }
+
+ LNET_UNLOCK();
+
+ LNetMDUnlink(rcd->rcd_mdh);
+
+ i++;
+ CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
+ "Waiting for rc buffers to unlink\n");
+ cfs_pause(cfs_time_seconds(1));
+
+ LNET_LOCK();
+ }
+
+ LNET_UNLOCK();
+
+ while (!cfs_list_empty(&free_rcd)) {
+ rcd = cfs_list_entry(free_rcd.next, lnet_rc_data_t, rcd_list);
+ cfs_list_del_init(&rcd->rcd_list);
+ lnet_destroy_rc_data(rcd);
+ }
+ return;
+}
+
+static int
+lnet_router_checker(void *arg)
+{
+ int rc;
+ lnet_peer_t *rtr;
+ cfs_list_t *entry;
+
+ cfs_daemonize("router_checker");
+ cfs_block_allsigs();
+
+ 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;
+
+ cfs_list_for_each (entry, &the_lnet.ln_routers) {
+ rtr = cfs_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();
+
+ if (the_lnet.ln_routing)
+ lnet_update_ni_status();
+
+ lnet_prune_zombie_rcd(0); /* don't wait for UNLINK */
+
+ /* Call cfs_pause() here always adds 1 to load average
+ * because kernel counts # active tasks as nr_running
+ * + nr_uninterruptible. */
+ cfs_schedule_timeout_and_set_state(CFS_TASK_INTERRUPTIBLE,
+ cfs_time_seconds(1));
+ }
+
+ LNET_LOCK();
+
+ cfs_list_for_each (entry, &the_lnet.ln_routers) {
+ rtr = cfs_list_entry(entry, lnet_peer_t, lp_rtr_list);
+
+ if (rtr->lp_rcd == NULL)
+ continue;
+
+ LASSERT (cfs_list_empty(&rtr->lp_rcd->rcd_list));
+ cfs_list_add(&rtr->lp_rcd->rcd_list, &the_lnet.ln_zombie_rcd);
+ rtr->lp_rcd = NULL;
+ }
+
+ LNET_UNLOCK();
+
+ lnet_prune_zombie_rcd(1); /* wait for UNLINK */
+
+ 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
int i;
LIBCFS_ALLOC(rb, sz);
+ if (rb == NULL)
+ return NULL;
rb->rb_pool = rbp;
int nbuffers = 0;
lnet_rtrbuf_t *rb;
- LASSERT (list_empty(&rbp->rbp_msgs));
+ LASSERT (cfs_list_empty(&rbp->rbp_msgs));
LASSERT (rbp->rbp_credits == rbp->rbp_nbuffers);
- while (!list_empty(&rbp->rbp_bufs)) {
+ while (!cfs_list_empty(&rbp->rbp_bufs)) {
LASSERT (rbp->rbp_credits > 0);
- rb = list_entry(rbp->rbp_bufs.next,
- lnet_rtrbuf_t, rb_list);
- list_del(&rb->rb_list);
+ rb = cfs_list_entry(rbp->rbp_bufs.next,
+ lnet_rtrbuf_t, rb_list);
+ cfs_list_del(&rb->rb_list);
lnet_destroy_rtrbuf(rb, npages);
nbuffers++;
}
LASSERT (rbp->rbp_nbuffers == nbufs);
return 0;
}
-
+
for (i = 0; i < nbufs; i++) {
rb = lnet_new_rtrbuf(rbp);
rbp->rbp_nbuffers++;
rbp->rbp_credits++;
rbp->rbp_mincredits++;
- list_add(&rb->rb_list, &rbp->rbp_bufs);
+ cfs_list_add(&rb->rb_list, &rbp->rbp_bufs);
/* No allocation "under fire" */
/* Otherwise we'd need code to schedule blocked msgs etc */
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, cfs_time_t when)
{
+ lnet_peer_t *lp = NULL;
+ cfs_time_t now = cfs_time_current();
+
+ LASSERT (!cfs_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 (cfs_time_after(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",
+ cfs_duration_sec(cfs_time_sub(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, cfs_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))
+ CNETERR("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;
+ cfs_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