-/* -*- 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, 2016, Intel Corporation.
*
- * This file is part of Portals
- * http://sourceforge.net/projects/sandiaportals/
+ * This file is part of Lustre, https://wiki.hpdd.intel.com/
*
* Portals is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
#define DEBUG_SUBSYSTEM S_LNET
#include <lnet/lib-lnet.h>
-#if defined(__KERNEL__) && defined(LNET_ROUTER)
+#define LNET_NRB_TINY_MIN 512 /* min value for each CPT */
+#define LNET_NRB_TINY (LNET_NRB_TINY_MIN * 4)
+#define LNET_NRB_SMALL_MIN 4096 /* min value for each CPT */
+#define LNET_NRB_SMALL (LNET_NRB_SMALL_MIN * 4)
+#define LNET_NRB_SMALL_PAGES 1
+#define LNET_NRB_LARGE_MIN 256 /* min value for each CPT */
+#define LNET_NRB_LARGE (LNET_NRB_LARGE_MIN * 4)
+#define LNET_NRB_LARGE_PAGES ((LNET_MTU + PAGE_SIZE - 1) >> \
+ PAGE_SHIFT)
static char *forwarding = "";
-CFS_MODULE_PARM(forwarding, "s", charp, 0444,
- "Explicitly enable/disable forwarding between networks");
-
-static int tiny_router_buffers = 512;
-CFS_MODULE_PARM(tiny_router_buffers, "i", int, 0444,
- "# of 0 payload messages to buffer in the router");
-static int small_router_buffers = 256;
-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;
-CFS_MODULE_PARM(large_router_buffers, "i", int, 0444,
- "# of large messages to buffer in the router");
+module_param(forwarding, charp, 0444);
+MODULE_PARM_DESC(forwarding, "Explicitly enable/disable forwarding between networks");
+
+static int tiny_router_buffers;
+module_param(tiny_router_buffers, int, 0444);
+MODULE_PARM_DESC(tiny_router_buffers, "# of 0 payload messages to buffer in the router");
+static int small_router_buffers;
+module_param(small_router_buffers, int, 0444);
+MODULE_PARM_DESC(small_router_buffers, "# of small (1 page) messages to buffer in the router");
+static int large_router_buffers;
+module_param(large_router_buffers, int, 0444);
+MODULE_PARM_DESC(large_router_buffers, "# of large messages to buffer in the router");
+static int peer_buffer_credits;
+module_param(peer_buffer_credits, int, 0444);
+MODULE_PARM_DESC(peer_buffer_credits, "# 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");
+module_param(auto_down, int, 0444);
+MODULE_PARM_DESC(auto_down, "Automatically mark peers down on comms error");
-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");
+int
+lnet_peer_buffer_credits(struct lnet_net *net)
+{
+ /* NI option overrides LNet default */
+ if (net->net_tunables.lct_peer_rtr_credits > 0)
+ return net->net_tunables.lct_peer_rtr_credits;
+ 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 net->net_tunables.lct_peer_tx_credits;
+}
+
+/* forward ref's */
+static int lnet_router_checker(void *);
+
+static int check_routers_before_use;
+module_param(check_routers_before_use, int, 0444);
+MODULE_PARM_DESC(check_routers_before_use, "Assume routers are down and ping them before use");
-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)");
+int avoid_asym_router_failure = 1;
+module_param(avoid_asym_router_failure, int, 0644);
+MODULE_PARM_DESC(avoid_asym_router_failure, "Avoid asymmetrical router failures (0 to disable)");
-static int live_router_check_interval = 0;
-CFS_MODULE_PARM(live_router_check_interval, "i", int, 0444,
- "Seconds between live router health checks (<= 0 to disable)");
+static int dead_router_check_interval = 60;
+module_param(dead_router_check_interval, int, 0644);
+MODULE_PARM_DESC(dead_router_check_interval, "Seconds between dead router health checks (<= 0 to disable)");
+
+static int live_router_check_interval = 60;
+module_param(live_router_check_interval, int, 0644);
+MODULE_PARM_DESC(live_router_check_interval, "Seconds between live router health checks (<= 0 to disable)");
static int router_ping_timeout = 50;
-CFS_MODULE_PARM(router_ping_timeout, "i", int, 0444,
- "Seconds to wait for the reply to a router health query");
+module_param(router_ping_timeout, int, 0644);
+MODULE_PARM_DESC(router_ping_timeout, "Seconds to wait for the reply to a router health query");
int
lnet_peers_start_down(void)
{
- return check_routers_before_use;
+ return check_routers_before_use;
}
void
-lnet_notify_locked(lnet_peer_t *lp, int notifylnd, int alive, time_t when)
+lnet_notify_locked(struct lnet_peer_ni *lp, int notifylnd, int alive,
+ cfs_time_t when)
{
- if (when < lp->lp_timestamp) { /* out of date information */
- CDEBUG(D_NET, "Out of date\n");
- return;
- }
+ if (cfs_time_before(when, lp->lpni_timestamp)) { /* out of date information */
+ CDEBUG(D_NET, "Out of date\n");
+ return;
+ }
- lp->lp_timestamp = when; /* update timestamp */
- lp->lp_ping_deadline = 0; /* disable ping timeout */
+ /*
+ * This function can be called with different cpt locks being
+ * held. lpni_alive_count modification needs to be properly protected.
+ * Significant reads to lpni_alive_count are also protected with
+ * the same lock
+ */
+ spin_lock(&lp->lpni_lock);
+
+ lp->lpni_timestamp = when; /* update timestamp */
+ lp->lpni_ping_deadline = 0; /* disable ping timeout */
+
+ if (lp->lpni_alive_count != 0 && /* got old news */
+ (!lp->lpni_alive) == (!alive)) { /* new date for old news */
+ spin_unlock(&lp->lpni_lock);
+ CDEBUG(D_NET, "Old news\n");
+ return;
+ }
- if (lp->lp_alive_count != 0 && /* got old news */
- (!lp->lp_alive) == (!alive)) { /* new date for old news */
- CDEBUG(D_NET, "Old news\n");
- return;
- }
+ /* Flag that notification is outstanding */
- /* Flag that notification is outstanding */
+ lp->lpni_alive_count++;
+ lp->lpni_alive = (alive) ? 1 : 0;
+ lp->lpni_notify = 1;
+ lp->lpni_notifylnd = notifylnd;
+ if (lp->lpni_alive)
+ lp->lpni_ping_feats = LNET_PING_FEAT_INVAL; /* reset */
- lp->lp_alive_count++;
- lp->lp_alive = !(!alive); /* 1 bit! */
- lp->lp_notify = 1;
- lp->lp_notifylnd |= notifylnd;
+ spin_unlock(&lp->lpni_lock);
- CDEBUG(D_NET, "set %s %d\n", libcfs_nid2str(lp->lp_nid), alive);
+ CDEBUG(D_NET, "set %s %d\n", libcfs_nid2str(lp->lpni_nid), alive);
}
-void
-lnet_do_notify (lnet_peer_t *lp)
+/*
+ * This function will always be called with lp->lpni_cpt lock held.
+ */
+static void
+lnet_ni_notify_locked(lnet_ni_t *ni, struct lnet_peer_ni *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 */
-
- if (lp->lp_notifying) {
- LNET_UNLOCK();
- return;
- }
+ int alive;
+ int notifylnd;
- lp->lp_notifying = 1;
-
- while (lp->lp_notify) {
- alive = lp->lp_alive;
- notifylnd = lp->lp_notifylnd;
+ /* 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_notifylnd = 0;
- lp->lp_notify = 0;
+ spin_lock(&lp->lpni_lock);
- if (notifylnd && ni->ni_lnd->lnd_notify != NULL) {
- LNET_UNLOCK();
+ if (lp->lpni_notifying || ni == NULL) {
+ spin_unlock(&lp->lpni_lock);
+ return;
+ }
- /* A new notification could happen now; I'll handle it
- * when control returns to me */
+ lp->lpni_notifying = 1;
- (ni->ni_lnd->lnd_notify)(ni, lp->lp_nid, alive);
+ /*
+ * lp->lpni_notify needs to be protected because it can be set in
+ * lnet_notify_locked().
+ */
+ while (lp->lpni_notify) {
+ alive = lp->lpni_alive;
+ notifylnd = lp->lpni_notifylnd;
- LNET_LOCK();
- }
- }
+ lp->lpni_notifylnd = 0;
+ lp->lpni_notify = 0;
- lp->lp_notifying = 0;
+ if (notifylnd && ni->ni_net->net_lnd->lnd_notify != NULL) {
+ spin_unlock(&lp->lpni_lock);
+ lnet_net_unlock(lp->lpni_cpt);
- LNET_UNLOCK();
-}
+ /* A new notification could happen now; I'll handle it
+ * when control returns to me */
-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);
+ (ni->ni_net->net_lnd->lnd_notify)(ni, lp->lpni_nid,
+ alive);
-#else
+ lnet_net_lock(lp->lpni_cpt);
+ spin_lock(&lp->lpni_lock);
+ }
+ }
-int
-lnet_notify (lnet_ni_t *ni, lnet_nid_t nid, int alive, time_t when)
-{
- return -EOPNOTSUPP;
+ lp->lpni_notifying = 0;
+ spin_unlock(&lp->lpni_lock);
}
-#endif
-
static void
-lnet_rtr_addref_locked(lnet_peer_t *lp)
+lnet_rtr_addref_locked(struct lnet_peer_ni *lp)
{
- LASSERT (lp->lp_refcount > 0);
- LASSERT (lp->lp_rtr_refcount >= 0);
-
- lp->lp_rtr_refcount++;
- if (lp->lp_rtr_refcount == 1) {
- struct list_head *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);
-
- if (rtr->lp_nid < lp->lp_nid)
- break;
- }
-
- list_add(&lp->lp_rtr_list, pos);
- /* addref for the_lnet.ln_routers */
- lnet_peer_addref_locked(lp);
- the_lnet.ln_routers_version++;
- }
+ LASSERT(atomic_read(&lp->lpni_refcount) > 0);
+ LASSERT(lp->lpni_rtr_refcount >= 0);
+
+ /* lnet_net_lock must be exclusively locked */
+ lp->lpni_rtr_refcount++;
+ if (lp->lpni_rtr_refcount == 1) {
+ struct list_head *pos;
+
+ /* a simple insertion sort */
+ list_for_each_prev(pos, &the_lnet.ln_routers) {
+ struct lnet_peer_ni *rtr =
+ list_entry(pos, struct lnet_peer_ni,
+ lpni_rtr_list);
+
+ if (rtr->lpni_nid < lp->lpni_nid)
+ break;
+ }
+
+ list_add(&lp->lpni_rtr_list, pos);
+ /* addref for the_lnet.ln_routers */
+ lnet_peer_ni_addref_locked(lp);
+ the_lnet.ln_routers_version++;
+ }
}
static void
-lnet_rtr_decref_locked(lnet_peer_t *lp)
+lnet_rtr_decref_locked(struct lnet_peer_ni *lp)
{
- LASSERT (lp->lp_refcount > 0);
- LASSERT (lp->lp_rtr_refcount > 0);
-
- lp->lp_rtr_refcount--;
- if (lp->lp_rtr_refcount == 0) {
- list_del(&lp->lp_rtr_list);
- /* decref for the_lnet.ln_routers */
- lnet_peer_decref_locked(lp);
- the_lnet.ln_routers_version++;
- }
+ LASSERT(atomic_read(&lp->lpni_refcount) > 0);
+ LASSERT(lp->lpni_rtr_refcount > 0);
+
+ /* lnet_net_lock must be exclusively locked */
+ lp->lpni_rtr_refcount--;
+ if (lp->lpni_rtr_refcount == 0) {
+ LASSERT(list_empty(&lp->lpni_routes));
+
+ if (lp->lpni_rcd != NULL) {
+ list_add(&lp->lpni_rcd->rcd_list,
+ &the_lnet.ln_rcd_deathrow);
+ lp->lpni_rcd = NULL;
+ }
+
+ list_del(&lp->lpni_rtr_list);
+ /* decref for the_lnet.ln_routers */
+ lnet_peer_ni_decref_locked(lp);
+ the_lnet.ln_routers_version++;
+ }
}
lnet_remotenet_t *
-lnet_find_net_locked (__u32 net)
+lnet_find_rnet_locked(__u32 net)
{
- lnet_remotenet_t *rnet;
- struct list_head *tmp;
+ lnet_remotenet_t *rnet;
+ struct list_head *tmp;
+ struct list_head *rn_list;
- LASSERT (!the_lnet.ln_shutdown);
+ LASSERT(!the_lnet.ln_shutdown);
- list_for_each (tmp, &the_lnet.ln_remote_nets) {
- rnet = list_entry(tmp, lnet_remotenet_t, lrn_list);
+ rn_list = lnet_net2rnethash(net);
+ list_for_each(tmp, rn_list) {
+ rnet = list_entry(tmp, lnet_remotenet_t, lrn_list);
- if (rnet->lrn_net == net)
- return rnet;
- }
- return NULL;
+ if (rnet->lrn_net == net)
+ return rnet;
+ }
+ return NULL;
}
-int
-lnet_add_route (__u32 net, unsigned int hops, lnet_nid_t gateway)
+static void lnet_shuffle_seed(void)
{
- struct list_head zombies;
- 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;
-
- CDEBUG(D_NET, "Add route: net %s hops %u gw %s\n",
- libcfs_net2str(net), hops, libcfs_nid2str(gateway));
-
- if (gateway == LNET_NID_ANY ||
- LNET_NETTYP(LNET_NIDNET(gateway)) == LOLND ||
- net == LNET_NIDNET(LNET_NID_ANY) ||
- LNET_NETTYP(net) == LOLND ||
- LNET_NIDNET(gateway) == net ||
- hops < 1 || hops > 255)
- return (-EINVAL);
-
- if (lnet_islocalnet(net)) /* it's a local network */
- return 0; /* ignore the route entry */
-
- /* Assume net, route, all new */
- LIBCFS_ALLOC(route, sizeof(*route));
- LIBCFS_ALLOC(rnet, sizeof(*rnet));
- if (route == NULL || rnet == NULL) {
- CERROR("Out of memory creating route %s %d %s\n",
- libcfs_net2str(net), hops, libcfs_nid2str(gateway));
- if (route != NULL)
- LIBCFS_FREE(route, sizeof(*route));
- if (rnet != NULL)
- LIBCFS_FREE(rnet, sizeof(*rnet));
- return -ENOMEM;
- }
-
- INIT_LIST_HEAD(&rnet->lrn_routes);
- rnet->lrn_net = net;
- rnet->lrn_hops = hops;
-
- LNET_LOCK();
-
- rc = lnet_nid2peer_locked(&route->lr_gateway, gateway);
- if (rc != 0) {
- LNET_UNLOCK();
-
- LIBCFS_FREE(route, sizeof(*route));
- LIBCFS_FREE(rnet, sizeof(*rnet));
-
- if (rc == -EHOSTUNREACH) /* gateway is not on a local net */
- return 0; /* ignore the route entry */
-
- CERROR("Error %d creating route %s %d %s\n", rc,
- libcfs_net2str(net), hops, libcfs_nid2str(gateway));
- return rc;
- }
-
- 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);
- 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;
- }
-
- /* our loopups 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_UNLOCK();
-
- /* XXX Assume alive */
- if (ni->ni_lnd->lnd_notify != NULL)
- (ni->ni_lnd->lnd_notify)(ni, gateway, 1);
-
- lnet_ni_decref(ni);
- } else {
- lnet_peer_decref_locked(route->lr_gateway);
- LNET_UNLOCK();
- LIBCFS_FREE(route, sizeof(*route));
- }
-
- 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;
+ static int seeded;
+ __u32 lnd_type;
+ __u32 seed[2];
+ struct timespec64 ts;
+ lnet_ni_t *ni = NULL;
+
+ 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 */
+ while ((ni = lnet_get_next_ni_locked(NULL, ni))) {
+ lnd_type = LNET_NETTYP(LNET_NIDNET(ni->ni_nid));
+
+ if (lnd_type != LOLND)
+ seed[0] ^= (LNET_NIDADDR(ni->ni_nid) | lnd_type);
+ }
+
+ ktime_get_ts64(&ts);
+ cfs_srand(ts.tv_sec ^ seed[0], ts.tv_nsec ^ seed[1]);
+ seeded = 1;
+ return;
}
-int
-lnet_check_routes (void)
+/* NB expects LNET_LOCK held */
+static void
+lnet_add_route_to_rnet(lnet_remotenet_t *rnet, lnet_route_t *route)
{
- lnet_remotenet_t *rnet;
- lnet_route_t *route;
- lnet_route_t *route2;
- struct list_head *e1;
- struct list_head *e2;
-
- LNET_LOCK();
-
- list_for_each (e1, &the_lnet.ln_remote_nets) {
- rnet = 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);
-
- 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),
- libcfs_nid2str(route2->lr_gateway->lp_nid));
- return -EINVAL;
- }
- }
- }
-
- LNET_UNLOCK();
- return 0;
+ unsigned int len = 0;
+ unsigned int offset = 0;
+ struct list_head *e;
+
+ lnet_shuffle_seed();
+
+ 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);
+ list_for_each(e, &rnet->lrn_routes) {
+ if (offset == 0)
+ break;
+ offset--;
+ }
+ list_add(&route->lr_list, e);
+ list_add(&route->lr_gwlist, &route->lr_gateway->lpni_routes);
+
+ the_lnet.ln_remote_nets_version++;
+ lnet_rtr_addref_locked(route->lr_gateway);
}
int
-lnet_del_route (__u32 net, lnet_nid_t gw_nid)
+lnet_add_route(__u32 net, __u32 hops, lnet_nid_t gateway,
+ unsigned int priority)
{
- lnet_remotenet_t *rnet;
- lnet_route_t *route;
- struct list_head *e1;
- struct list_head *e2;
- int rc = -ENOENT;
+ struct list_head *e;
+ lnet_remotenet_t *rnet;
+ lnet_remotenet_t *rnet2;
+ lnet_route_t *route;
+ lnet_ni_t *ni;
+ struct lnet_peer_ni *lpni;
+ int add_route;
+ int rc;
+
+ CDEBUG(D_NET, "Add route: net %s hops %d priority %u gw %s\n",
+ libcfs_net2str(net), hops, priority, libcfs_nid2str(gateway));
+
+ if (gateway == LNET_NID_ANY ||
+ LNET_NETTYP(LNET_NIDNET(gateway)) == LOLND ||
+ net == LNET_NIDNET(LNET_NID_ANY) ||
+ LNET_NETTYP(net) == LOLND ||
+ LNET_NIDNET(gateway) == net ||
+ (hops != LNET_UNDEFINED_HOPS && (hops < 1 || hops > 255)))
+ return -EINVAL;
+
+ if (lnet_islocalnet(net)) /* it's a local network */
+ return -EEXIST;
+
+ /* Assume net, route, all new */
+ LIBCFS_ALLOC(route, sizeof(*route));
+ LIBCFS_ALLOC(rnet, sizeof(*rnet));
+ if (route == NULL || rnet == NULL) {
+ CERROR("Out of memory creating route %s %d %s\n",
+ libcfs_net2str(net), hops, libcfs_nid2str(gateway));
+ if (route != NULL)
+ LIBCFS_FREE(route, sizeof(*route));
+ if (rnet != NULL)
+ LIBCFS_FREE(rnet, sizeof(*rnet));
+ return -ENOMEM;
+ }
+
+ INIT_LIST_HEAD(&rnet->lrn_routes);
+ rnet->lrn_net = net;
+ route->lr_hops = hops;
+ route->lr_net = net;
+ route->lr_priority = priority;
+
+ lnet_net_lock(LNET_LOCK_EX);
+
+ lpni = lnet_nid2peerni_locked(gateway, LNET_LOCK_EX);
+ if (IS_ERR(lpni)) {
+ lnet_net_unlock(LNET_LOCK_EX);
+
+ LIBCFS_FREE(route, sizeof(*route));
+ LIBCFS_FREE(rnet, sizeof(*rnet));
- CDEBUG(D_NET, "Del route: net %s : gw %s\n",
- libcfs_net2str(net), libcfs_nid2str(gw_nid));
+ rc = PTR_ERR(lpni);
+ if (rc == -EHOSTUNREACH) /* gateway is not on a local net. */
+ return rc; /* ignore the route entry */
+ CERROR("Error %d creating route %s %d %s\n", rc,
+ libcfs_net2str(net), hops,
+ libcfs_nid2str(gateway));
+ return rc;
+ }
+ route->lr_gateway = lpni;
+ LASSERT(!the_lnet.ln_shutdown);
+
+ rnet2 = lnet_find_rnet_locked(net);
+ if (rnet2 == NULL) {
+ /* new network */
+ list_add_tail(&rnet->lrn_list, lnet_net2rnethash(net));
+ rnet2 = rnet;
+ }
+
+ /* Search for a duplicate route (it's a NOOP if it is) */
+ add_route = 1;
+ list_for_each(e, &rnet2->lrn_routes) {
+ lnet_route_t *route2 = list_entry(e, lnet_route_t, lr_list);
- /* NB Caller may specify either all routes via the given gateway
- * or a specific route entry actual NIDs) */
+ if (route2->lr_gateway == route->lr_gateway) {
+ add_route = 0;
+ break;
+ }
+
+ /* our lookups must be true */
+ LASSERT(route2->lr_gateway->lpni_nid != gateway);
+ }
- again:
- LNET_LOCK();
+ if (add_route) {
+ lnet_peer_ni_addref_locked(route->lr_gateway); /* +1 for notify */
+ lnet_add_route_to_rnet(rnet2, route);
+
+ ni = lnet_get_next_ni_locked(route->lr_gateway->lpni_net, NULL);
+ lnet_net_unlock(LNET_LOCK_EX);
+
+ /* XXX Assume alive */
+ if (ni->ni_net->net_lnd->lnd_notify != NULL)
+ (ni->ni_net->net_lnd->lnd_notify)(ni, gateway, 1);
+
+ lnet_net_lock(LNET_LOCK_EX);
+ }
- list_for_each (e1, &the_lnet.ln_remote_nets) {
- rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
+ /* -1 for notify or !add_route */
+ lnet_peer_ni_decref_locked(route->lr_gateway);
+ lnet_net_unlock(LNET_LOCK_EX);
- if (!(net == LNET_NIDNET(LNET_NID_ANY) ||
- net == rnet->lrn_net))
- continue;
+ rc = 0;
- list_for_each (e2, &rnet->lrn_routes) {
- route = list_entry(e2, lnet_route_t, lr_list);
+ if (!add_route) {
+ rc = -EEXIST;
+ LIBCFS_FREE(route, sizeof(*route));
+ }
- if (!(gw_nid == LNET_NID_ANY ||
- gw_nid == route->lr_gateway->lp_nid))
- continue;
+ if (rnet != rnet2)
+ LIBCFS_FREE(rnet, sizeof(*rnet));
- list_del(&route->lr_list);
- the_lnet.ln_remote_nets_version++;
+ /* indicate to startup the router checker if configured */
+ wake_up(&the_lnet.ln_rc_waitq);
- if (list_empty(&rnet->lrn_routes))
- list_del(&rnet->lrn_list);
- else
- rnet = NULL;
+ return rc;
+}
- lnet_rtr_decref_locked(route->lr_gateway);
- lnet_peer_decref_locked(route->lr_gateway);
- LNET_UNLOCK();
+int
+lnet_check_routes(void)
+{
+ lnet_remotenet_t *rnet;
+ lnet_route_t *route;
+ lnet_route_t *route2;
+ struct list_head *e1;
+ struct list_head *e2;
+ int cpt;
+ struct list_head *rn_list;
+ int i;
+
+ cpt = lnet_net_lock_current();
+
+ for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
+ rn_list = &the_lnet.ln_remote_nets_hash[i];
+ list_for_each(e1, rn_list) {
+ rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
+
+ route2 = NULL;
+ list_for_each(e2, &rnet->lrn_routes) {
+ lnet_nid_t nid1;
+ lnet_nid_t nid2;
+ int net;
+
+ route = list_entry(e2, lnet_route_t,
+ lr_list);
+
+ if (route2 == NULL) {
+ route2 = route;
+ continue;
+ }
+
+ if (route->lr_gateway->lpni_net ==
+ route2->lr_gateway->lpni_net)
+ continue;
+
+ nid1 = route->lr_gateway->lpni_nid;
+ nid2 = route2->lr_gateway->lpni_nid;
+ net = rnet->lrn_net;
+
+ lnet_net_unlock(cpt);
+
+ CERROR("Routes to %s via %s and %s not "
+ "supported\n",
+ libcfs_net2str(net),
+ libcfs_nid2str(nid1),
+ libcfs_nid2str(nid2));
+ return -EINVAL;
+ }
+ }
+ }
- LIBCFS_FREE(route, sizeof (*route));
+ lnet_net_unlock(cpt);
+ return 0;
+}
- if (rnet != NULL)
- LIBCFS_FREE(rnet, sizeof(*rnet));
+int
+lnet_del_route(__u32 net, lnet_nid_t gw_nid)
+{
+ struct lnet_peer_ni *gateway;
+ lnet_remotenet_t *rnet;
+ lnet_route_t *route;
+ struct list_head *e1;
+ struct list_head *e2;
+ int rc = -ENOENT;
+ struct list_head *rn_list;
+ int idx = 0;
+
+ CDEBUG(D_NET, "Del route: net %s : gw %s\n",
+ libcfs_net2str(net), libcfs_nid2str(gw_nid));
+
+ /* NB Caller may specify either all routes via the given gateway
+ * or a specific route entry actual NIDs) */
+
+ lnet_net_lock(LNET_LOCK_EX);
+ if (net == LNET_NIDNET(LNET_NID_ANY))
+ rn_list = &the_lnet.ln_remote_nets_hash[0];
+ else
+ rn_list = lnet_net2rnethash(net);
+
+again:
+ list_for_each(e1, rn_list) {
+ rnet = 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);
+
+ gateway = route->lr_gateway;
+ if (!(gw_nid == LNET_NID_ANY ||
+ gw_nid == gateway->lpni_nid))
+ continue;
+
+ list_del(&route->lr_list);
+ list_del(&route->lr_gwlist);
+ the_lnet.ln_remote_nets_version++;
+
+ if (list_empty(&rnet->lrn_routes))
+ list_del(&rnet->lrn_list);
+ else
+ rnet = NULL;
+
+ lnet_rtr_decref_locked(gateway);
+ lnet_peer_ni_decref_locked(gateway);
+
+ lnet_net_unlock(LNET_LOCK_EX);
+
+ LIBCFS_FREE(route, sizeof(*route));
+
+ if (rnet != NULL)
+ LIBCFS_FREE(rnet, sizeof(*rnet));
+
+ rc = 0;
+ lnet_net_lock(LNET_LOCK_EX);
+ goto again;
+ }
+ }
- rc = 0;
- goto again;
- }
- }
+ if (net == LNET_NIDNET(LNET_NID_ANY) &&
+ ++idx < LNET_REMOTE_NETS_HASH_SIZE) {
+ rn_list = &the_lnet.ln_remote_nets_hash[idx];
+ goto again;
+ }
+ lnet_net_unlock(LNET_LOCK_EX);
- LNET_UNLOCK();
- return rc;
+ return rc;
}
void
lnet_destroy_routes (void)
{
- lnet_del_route(LNET_NIDNET(LNET_NID_ANY), LNET_NID_ANY);
+ lnet_del_route(LNET_NIDNET(LNET_NID_ANY), LNET_NID_ANY);
+}
+
+int lnet_get_rtr_pool_cfg(int idx, struct lnet_ioctl_pool_cfg *pool_cfg)
+{
+ int i, rc = -ENOENT, j;
+
+ if (the_lnet.ln_rtrpools == NULL)
+ return rc;
+
+ for (i = 0; i < LNET_NRBPOOLS; i++) {
+ lnet_rtrbufpool_t *rbp;
+
+ lnet_net_lock(LNET_LOCK_EX);
+ cfs_percpt_for_each(rbp, j, the_lnet.ln_rtrpools) {
+ if (i++ != idx)
+ continue;
+
+ pool_cfg->pl_pools[i].pl_npages = rbp[i].rbp_npages;
+ pool_cfg->pl_pools[i].pl_nbuffers = rbp[i].rbp_nbuffers;
+ pool_cfg->pl_pools[i].pl_credits = rbp[i].rbp_credits;
+ pool_cfg->pl_pools[i].pl_mincredits = rbp[i].rbp_mincredits;
+ rc = 0;
+ break;
+ }
+ lnet_net_unlock(LNET_LOCK_EX);
+ }
+
+ lnet_net_lock(LNET_LOCK_EX);
+ pool_cfg->pl_routing = the_lnet.ln_routing;
+ lnet_net_unlock(LNET_LOCK_EX);
+
+ return rc;
}
int
-lnet_get_route (int idx, __u32 *net, __u32 *hops,
- lnet_nid_t *gateway, __u32 *alive)
+lnet_get_route(int idx, __u32 *net, __u32 *hops,
+ lnet_nid_t *gateway, __u32 *alive, __u32 *priority)
{
- struct list_head *e1;
- struct list_head *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);
-
- list_for_each (e2, &rnet->lrn_routes) {
- route = list_entry(e2, lnet_route_t, lr_list);
-
- if (idx-- == 0) {
- *net = rnet->lrn_net;
- *hops = rnet->lrn_hops;
- *gateway = route->lr_gateway->lp_nid;
- *alive = route->lr_gateway->lp_alive;
- LNET_UNLOCK();
- return 0;
- }
- }
- }
-
- LNET_UNLOCK();
- return -ENOENT;
+ struct list_head *e1;
+ struct list_head *e2;
+ lnet_remotenet_t *rnet;
+ lnet_route_t *route;
+ int cpt;
+ int i;
+ struct list_head *rn_list;
+
+ cpt = lnet_net_lock_current();
+
+ for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
+ rn_list = &the_lnet.ln_remote_nets_hash[i];
+ list_for_each(e1, rn_list) {
+ rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
+
+ list_for_each(e2, &rnet->lrn_routes) {
+ route = list_entry(e2, lnet_route_t,
+ lr_list);
+
+ if (idx-- == 0) {
+ *net = rnet->lrn_net;
+ *hops = route->lr_hops;
+ *priority = route->lr_priority;
+ *gateway = route->lr_gateway->lpni_nid;
+ *alive = lnet_is_route_alive(route);
+ lnet_net_unlock(cpt);
+ return 0;
+ }
+ }
+ }
+ }
+
+ lnet_net_unlock(cpt);
+ return -ENOENT;
}
-#if defined(__KERNEL__) && defined(LNET_ROUTER)
-static void
-lnet_router_checker_event (lnet_event_t *event)
+void
+lnet_swap_pinginfo(struct lnet_ping_info *info)
{
- /* 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;
-
- if (event->unlinked) {
- /* 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);
- return;
- }
-
- LASSERT (event->type == LNET_EVENT_SEND ||
- event->type == LNET_EVENT_REPLY);
-
- nid = (event->type == LNET_EVENT_SEND) ?
- event->target.nid : event->initiator.nid;
-
- lp = lnet_find_peer_locked(nid);
- if (lp == NULL) {
- /* router may have been removed */
- CDEBUG(D_NET, "Router %s not found\n", libcfs_nid2str(nid));
- return;
- }
-
- if (event->type == LNET_EVENT_SEND) /* re-enable another ping */
- lp->lp_ping_notsent = 0;
-
- 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());
-
- /* The router checker will wake up very shortly and do the
- * actual notification.
- * XXX If 'lp' stops being a router before then, it will still
- * have the notification pending!!! */
- }
-
- /* This decref will NOT drop LNET_LOCK (it had to have 1 ref when it
- * was in the peer table and I've not dropped the lock, so no-one else
- * can have reduced the refcount) */
- LASSERT(lp->lp_refcount > 1);
-
- lnet_peer_decref_locked(lp);
+ int i;
+ struct lnet_ni_status *stat;
+
+ __swab32s(&info->pi_magic);
+ __swab32s(&info->pi_features);
+ __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;
}
-static int
-lnet_router_checker(void *arg)
+/**
+ * parse router-checker pinginfo, record number of down NIs for remote
+ * networks on that router.
+ */
+static void
+lnet_parse_rc_info(lnet_rc_data_t *rcd)
{
- static lnet_ping_info_t pinginfo;
+ struct lnet_ping_info *info = rcd->rcd_pinginfo;
+ struct lnet_peer_ni *gw = rcd->rcd_gateway;
+ lnet_route_t *rte;
+
+ if (!gw->lpni_alive)
+ return;
+
+ /*
+ * Protect gw->lpni_ping_feats. This can be set from
+ * lnet_notify_locked with different locks being held
+ */
+ spin_lock(&gw->lpni_lock);
+
+ if (info->pi_magic == __swab32(LNET_PROTO_PING_MAGIC))
+ lnet_swap_pinginfo(info);
+
+ /* NB always racing with network! */
+ if (info->pi_magic != LNET_PROTO_PING_MAGIC) {
+ CDEBUG(D_NET, "%s: Unexpected magic %08x\n",
+ libcfs_nid2str(gw->lpni_nid), info->pi_magic);
+ gw->lpni_ping_feats = LNET_PING_FEAT_INVAL;
+ spin_unlock(&gw->lpni_lock);
+ return;
+ }
- 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;
+ gw->lpni_ping_feats = info->pi_features;
+ if ((gw->lpni_ping_feats & LNET_PING_FEAT_MASK) == 0) {
+ CDEBUG(D_NET, "%s: Unexpected features 0x%x\n",
+ libcfs_nid2str(gw->lpni_nid), gw->lpni_ping_feats);
+ spin_unlock(&gw->lpni_lock);
+ return; /* nothing I can understand */
+ }
- cfs_daemonize("router_checker");
- cfs_block_allsigs();
+ if ((gw->lpni_ping_feats & LNET_PING_FEAT_NI_STATUS) == 0) {
+ spin_unlock(&gw->lpni_lock);
+ return; /* can't carry NI status info */
+ }
- rtr_id.pid = LUSTRE_SRV_LNET_PID;
+ list_for_each_entry(rte, &gw->lpni_routes, lr_gwlist) {
+ int down = 0;
+ int up = 0;
+ int i;
+
+ if ((gw->lpni_ping_feats & LNET_PING_FEAT_RTE_DISABLED) != 0) {
+ rte->lr_downis = 1;
+ continue;
+ }
+
+ for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
+ struct lnet_ni_status *stat = &info->pi_ni[i];
+ lnet_nid_t nid = stat->ns_nid;
+
+ if (nid == LNET_NID_ANY) {
+ CDEBUG(D_NET, "%s: unexpected LNET_NID_ANY\n",
+ libcfs_nid2str(gw->lpni_nid));
+ gw->lpni_ping_feats = LNET_PING_FEAT_INVAL;
+ spin_unlock(&gw->lpni_lock);
+ return;
+ }
+
+ if (LNET_NETTYP(LNET_NIDNET(nid)) == LOLND)
+ continue;
+
+ if (stat->ns_status == LNET_NI_STATUS_DOWN) {
+ down++;
+ continue;
+ }
+
+ if (stat->ns_status == LNET_NI_STATUS_UP) {
+ if (LNET_NIDNET(nid) == rte->lr_net) {
+ up = 1;
+ break;
+ }
+ continue;
+ }
+
+ CDEBUG(D_NET, "%s: Unexpected status 0x%x\n",
+ libcfs_nid2str(gw->lpni_nid), stat->ns_status);
+ gw->lpni_ping_feats = LNET_PING_FEAT_INVAL;
+ spin_unlock(&gw->lpni_lock);
+ return;
+ }
+
+ if (up) { /* ignore downed NIs if NI for dest network is up */
+ rte->lr_downis = 0;
+ continue;
+ }
+ /* if @down is zero and this route is single-hop, it means
+ * we can't find NI for target network */
+ if (down == 0 && rte->lr_hops == 1)
+ down = 1;
+
+ rte->lr_downis = down;
+ }
- LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
+ spin_unlock(&gw->lpni_lock);
+}
- 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);
+static void
+lnet_router_checker_event(lnet_event_t *event)
+{
+ lnet_rc_data_t *rcd = event->md.user_ptr;
+ struct lnet_peer_ni *lp;
- 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;
- }
+ LASSERT(rcd != NULL);
- LASSERT (rc == 0);
+ if (event->unlinked) {
+ LNetInvalidateHandle(&rcd->rcd_mdh);
+ return;
+ }
- the_lnet.ln_rc_state = LNET_RC_STATE_RUNNING;
- mutex_up(&the_lnet.ln_rc_signal); /* let my parent go */
+ LASSERT(event->type == LNET_EVENT_SEND ||
+ event->type == LNET_EVENT_REPLY);
- while (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING) {
- __u64 version;
+ lp = rcd->rcd_gateway;
+ LASSERT(lp != NULL);
- LNET_LOCK();
-rescan:
- version = the_lnet.ln_routers_version;
+ /* NB: it's called with holding lnet_res_lock, we have a few
+ * places need to hold both locks at the same time, please take
+ * care of lock ordering */
+ lnet_net_lock(lp->lpni_cpt);
+ if (!lnet_isrouter(lp) || lp->lpni_rcd != rcd) {
+ /* ignore if no longer a router or rcd is replaced */
+ goto out;
+ }
- list_for_each (entry, &the_lnet.ln_routers) {
- rtr = list_entry(entry, lnet_peer_t, lp_rtr_list);
+ if (event->type == LNET_EVENT_SEND) {
+ lp->lpni_ping_notsent = 0;
+ if (event->status == 0)
+ goto out;
+ }
- lnet_peer_addref_locked(rtr);
+ /* 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). */
- now = cfs_time_current_sec();
+ lnet_notify_locked(lp, 1, (event->status == 0), cfs_time_current());
+ /* The router checker will wake up very shortly and do the
+ * actual notification.
+ * XXX If 'lp' stops being a router before then, it will still
+ * have the notification pending!!! */
- 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 && event->status == 0)
+ lnet_parse_rc_info(rcd);
- LNET_UNLOCK();
+ out:
+ lnet_net_unlock(lp->lpni_cpt);
+}
- /* Run any outstanding notificiations */
- lnet_do_notify(rtr);
+static void
+lnet_wait_known_routerstate(void)
+{
+ struct lnet_peer_ni *rtr;
+ struct list_head *entry;
+ int all_known;
- 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));
+ LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
- LNET_LOCK();
- rtr_id.nid = rtr->lp_nid;
- rtr->lp_ping_notsent = 1;
- rtr->lp_ping_timestamp = now;
+ for (;;) {
+ int cpt = lnet_net_lock_current();
- if (rtr->lp_ping_deadline == 0)
- rtr->lp_ping_deadline =
- now + router_ping_timeout;
+ all_known = 1;
+ list_for_each(entry, &the_lnet.ln_routers) {
+ rtr = list_entry(entry, struct lnet_peer_ni,
+ lpni_rtr_list);
- LNET_UNLOCK();
+ spin_lock(&rtr->lpni_lock);
- LNetGet(LNET_NID_ANY, mdh, rtr_id,
- LNET_RESERVED_PORTAL,
- LNET_PROTO_PING_MATCHBITS, 0);
- }
-
- LNET_LOCK();
- lnet_peer_decref_locked(rtr);
+ if (rtr->lpni_alive_count == 0) {
+ all_known = 0;
+ spin_unlock(&rtr->lpni_lock);
+ break;
+ }
+ spin_unlock(&rtr->lpni_lock);
+ }
- if (version != the_lnet.ln_routers_version) {
- /* the routers list has changed */
- goto rescan;
- }
- }
+ lnet_net_unlock(cpt);
- LNET_UNLOCK();
+ if (all_known)
+ 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));
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(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(mdh);
- LASSERT (rc == 0);
+void
+lnet_router_ni_update_locked(struct lnet_peer_ni *gw, __u32 net)
+{
+ lnet_route_t *rte;
+
+ if ((gw->lpni_ping_feats & LNET_PING_FEAT_NI_STATUS) != 0) {
+ list_for_each_entry(rte, &gw->lpni_routes, lr_gwlist) {
+ if (rte->lr_net == net) {
+ rte->lr_downis = 0;
+ break;
+ }
+ }
+ }
+}
- /* The unlink event callback will signal final completion */
+static void
+lnet_update_ni_status_locked(void)
+{
+ lnet_ni_t *ni = NULL;
+ time64_t now;
+ int timeout;
+
+ LASSERT(the_lnet.ln_routing);
+
+ timeout = router_ping_timeout +
+ MAX(live_router_check_interval, dead_router_check_interval);
+
+ now = ktime_get_real_seconds();
+ while ((ni = lnet_get_next_ni_locked(NULL, ni))) {
+ if (ni->ni_net->net_lnd->lnd_type == LOLND)
+ continue;
+
+ if (now < ni->ni_last_alive + timeout)
+ continue;
+
+ lnet_ni_lock(ni);
+ /* re-check with lock */
+ if (now < ni->ni_last_alive + timeout) {
+ lnet_ni_unlock(ni);
+ continue;
+ }
+
+ LASSERT(ni->ni_status != NULL);
+
+ if (ni->ni_status->ns_status != LNET_NI_STATUS_DOWN) {
+ CDEBUG(D_NET, "NI(%s:%d) status changed to down\n",
+ libcfs_nid2str(ni->ni_nid), timeout);
+ /* NB: so far, this is the only place to set
+ * NI status to "down" */
+ ni->ni_status->ns_status = LNET_NI_STATUS_DOWN;
+ }
+ lnet_ni_unlock(ni);
+ }
+}
- return 0;
+static void
+lnet_destroy_rc_data(lnet_rc_data_t *rcd)
+{
+ LASSERT(list_empty(&rcd->rcd_list));
+ /* detached from network */
+ LASSERT(LNetHandleIsInvalid(rcd->rcd_mdh));
+
+ if (rcd->rcd_gateway != NULL) {
+ int cpt = rcd->rcd_gateway->lpni_cpt;
+
+ lnet_net_lock(cpt);
+ lnet_peer_ni_decref_locked(rcd->rcd_gateway);
+ lnet_net_unlock(cpt);
+ }
+
+ if (rcd->rcd_pinginfo != NULL)
+ LIBCFS_FREE(rcd->rcd_pinginfo, LNET_PINGINFO_SIZE);
+
+ LIBCFS_FREE(rcd, sizeof(*rcd));
}
+static lnet_rc_data_t *
+lnet_create_rc_data_locked(struct lnet_peer_ni *gateway)
+{
+ lnet_rc_data_t *rcd = NULL;
+ struct lnet_ping_info *pi;
+ int rc;
+ int i;
-void
-lnet_wait_known_routerstate(void)
+ lnet_net_unlock(gateway->lpni_cpt);
+
+ LIBCFS_ALLOC(rcd, sizeof(*rcd));
+ if (rcd == NULL)
+ goto out;
+
+ LNetInvalidateHandle(&rcd->rcd_mdh);
+ INIT_LIST_HEAD(&rcd->rcd_list);
+
+ LIBCFS_ALLOC(pi, LNET_PINGINFO_SIZE);
+ if (pi == NULL)
+ goto out;
+
+ 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;
+
+ 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,
+ &rcd->rcd_mdh);
+ if (rc < 0) {
+ CERROR("Can't bind MD: %d\n", rc);
+ goto out;
+ }
+ LASSERT(rc == 0);
+
+ lnet_net_lock(gateway->lpni_cpt);
+ /* router table changed or someone has created rcd for this gateway */
+ if (!lnet_isrouter(gateway) || gateway->lpni_rcd != NULL) {
+ lnet_net_unlock(gateway->lpni_cpt);
+ goto out;
+ }
+
+ lnet_peer_ni_addref_locked(gateway);
+ rcd->rcd_gateway = gateway;
+ gateway->lpni_rcd = rcd;
+ gateway->lpni_ping_notsent = 0;
+
+ return rcd;
+
+out:
+ if (rcd != NULL) {
+ if (!LNetHandleIsInvalid(rcd->rcd_mdh)) {
+ rc = LNetMDUnlink(rcd->rcd_mdh);
+ LASSERT(rc == 0);
+ }
+ lnet_destroy_rc_data(rcd);
+ }
+
+ lnet_net_lock(gateway->lpni_cpt);
+ return gateway->lpni_rcd;
+}
+
+static int
+lnet_router_check_interval (struct lnet_peer_ni *rtr)
{
- 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;
- }
- }
-
- LNET_UNLOCK();
-
- if (all_known)
- return;
-
- cfs_pause(cfs_time_seconds(1));
- }
+ int secs;
+
+ secs = rtr->lpni_alive ? live_router_check_interval :
+ dead_router_check_interval;
+ if (secs < 0)
+ secs = 0;
+
+ return secs;
}
-void
-lnet_router_checker_stop(void)
+static void
+lnet_ping_router_locked (struct lnet_peer_ni *rtr)
{
- int rc;
+ lnet_rc_data_t *rcd = NULL;
+ cfs_time_t now = cfs_time_current();
+ int secs;
+ struct lnet_ni *ni;
+
+ lnet_peer_ni_addref_locked(rtr);
+
+ if (rtr->lpni_ping_deadline != 0 && /* ping timed out? */
+ cfs_time_after(now, rtr->lpni_ping_deadline))
+ lnet_notify_locked(rtr, 1, 0, now);
+
+ /* Run any outstanding notifications */
+ ni = lnet_get_next_ni_locked(rtr->lpni_net, NULL);
+ lnet_ni_notify_locked(ni, rtr);
+
+ if (!lnet_isrouter(rtr) ||
+ the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING) {
+ /* router table changed or router checker is shutting down */
+ lnet_peer_ni_decref_locked(rtr);
+ return;
+ }
- LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING ||
- the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
+ rcd = rtr->lpni_rcd != NULL ?
+ rtr->lpni_rcd : lnet_create_rc_data_locked(rtr);
- if (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN)
- return;
+ if (rcd == NULL)
+ return;
- the_lnet.ln_rc_state = LNET_RC_STATE_STOPTHREAD;
- /* block until event callback signals exit */
- mutex_down(&the_lnet.ln_rc_signal);
+ secs = lnet_router_check_interval(rtr);
+
+ CDEBUG(D_NET,
+ "rtr %s %d: deadline %lu ping_notsent %d alive %d "
+ "alive_count %d lpni_ping_timestamp %lu\n",
+ libcfs_nid2str(rtr->lpni_nid), secs,
+ rtr->lpni_ping_deadline, rtr->lpni_ping_notsent,
+ rtr->lpni_alive, rtr->lpni_alive_count, rtr->lpni_ping_timestamp);
+
+ if (secs != 0 && !rtr->lpni_ping_notsent &&
+ cfs_time_after(now, cfs_time_add(rtr->lpni_ping_timestamp,
+ cfs_time_seconds(secs)))) {
+ int rc;
+ lnet_process_id_t id;
+ lnet_handle_md_t mdh;
+
+ id.nid = rtr->lpni_nid;
+ id.pid = LNET_PID_LUSTRE;
+ CDEBUG(D_NET, "Check: %s\n", libcfs_id2str(id));
- LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_UNLINKED);
+ rtr->lpni_ping_notsent = 1;
+ rtr->lpni_ping_timestamp = now;
- rc = LNetEQFree(the_lnet.ln_rc_eqh);
- LASSERT (rc == 0);
-
- the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
+ mdh = rcd->rcd_mdh;
+
+ if (rtr->lpni_ping_deadline == 0) {
+ rtr->lpni_ping_deadline =
+ cfs_time_shift(router_ping_timeout);
+ }
+
+ lnet_net_unlock(rtr->lpni_cpt);
+
+ rc = LNetGet(LNET_NID_ANY, mdh, id, LNET_RESERVED_PORTAL,
+ LNET_PROTO_PING_MATCHBITS, 0);
+
+ lnet_net_lock(rtr->lpni_cpt);
+ if (rc != 0)
+ rtr->lpni_ping_notsent = 0; /* no event pending */
+ }
+
+ lnet_peer_ni_decref_locked(rtr);
+ return;
}
int
lnet_router_checker_start(void)
{
- int rc;
-
- LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
-
- if (check_routers_before_use &&
- dead_router_check_interval <= 0) {
- LCONSOLE_ERROR(0x10a, "'dead_router_check_interval' must be set if "
- "'check_routers_before_use' is set\n");
- return -EINVAL;
- }
-
- if (live_router_check_interval <= 0 &&
- dead_router_check_interval <= 0)
- return 0;
-
- 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,
- &the_lnet.ln_rc_eqh);
- if (rc != 0) {
- CERROR("Can't allocate EQ: %d\n", rc);
- return -ENOMEM;
- }
-
- rc = (int)cfs_kernel_thread(lnet_router_checker, NULL, 0);
- if (rc < 0) {
+ int rc;
+ int eqsz = 0;
+ struct task_struct *task;
+
+ LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
+
+ if (check_routers_before_use &&
+ dead_router_check_interval <= 0) {
+ LCONSOLE_ERROR_MSG(0x10a, "'dead_router_check_interval' must be"
+ " set if 'check_routers_before_use' is set"
+ "\n");
+ return -EINVAL;
+ }
+
+ sema_init(&the_lnet.ln_rc_signal, 0);
+
+ rc = LNetEQAlloc(0, lnet_router_checker_event, &the_lnet.ln_rc_eqh);
+ if (rc != 0) {
+ CERROR("Can't allocate EQ(%d): %d\n", eqsz, rc);
+ return -ENOMEM;
+ }
+
+ the_lnet.ln_rc_state = LNET_RC_STATE_RUNNING;
+ task = kthread_run(lnet_router_checker, NULL, "router_checker");
+ if (IS_ERR(task)) {
+ rc = PTR_ERR(task);
CERROR("Can't start router checker thread: %d\n", rc);
- goto failed;
- }
-
- mutex_down(&the_lnet.ln_rc_signal); /* wait for checker to startup */
-
- rc = the_lnet.ln_rc_state;
- if (rc < 0) {
- the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
- goto failed;
- }
-
- LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
-
- if (check_routers_before_use) {
- /* Note that a helpful side-effect of pinging all known routers
- * at startup is that it makes them drop stale connections they
- * may have to a previous instance of me. */
- lnet_wait_known_routerstate();
- }
-
- return 0;
-
- failed:
- rc = LNetEQFree(the_lnet.ln_rc_eqh);
- LASSERT (rc == 0);
- return rc;
+ /* block until event callback signals exit */
+ 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;
+ return -ENOMEM;
+ }
+
+ if (check_routers_before_use) {
+ /* Note that a helpful side-effect of pinging all known routers
+ * at startup is that it makes them drop stale connections they
+ * may have to a previous instance of me. */
+ lnet_wait_known_routerstate();
+ }
+
+ return 0;
}
void
-lnet_destroy_rtrbuf(lnet_rtrbuf_t *rb, int npages)
+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_STOPPING;
+ /* wakeup the RC thread if it's sleeping */
+ wake_up(&the_lnet.ln_rc_waitq);
+
+ /* block until event callback signals exit */
+ down(&the_lnet.ln_rc_signal);
+ LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN);
+
+ rc = LNetEQFree(the_lnet.ln_rc_eqh);
+ LASSERT(rc == 0);
+ return;
+}
+
+static void
+lnet_prune_rc_data(int wait_unlink)
{
- int sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
+ lnet_rc_data_t *rcd;
+ lnet_rc_data_t *tmp;
+ struct lnet_peer_ni *lp;
+ struct list_head head;
+ int i = 2;
+
+ if (likely(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING &&
+ list_empty(&the_lnet.ln_rcd_deathrow) &&
+ list_empty(&the_lnet.ln_rcd_zombie)))
+ return;
+
+ INIT_LIST_HEAD(&head);
+
+ lnet_net_lock(LNET_LOCK_EX);
+
+ if (the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING) {
+ /* router checker is stopping, prune all */
+ list_for_each_entry(lp, &the_lnet.ln_routers,
+ lpni_rtr_list) {
+ if (lp->lpni_rcd == NULL)
+ continue;
+
+ LASSERT(list_empty(&lp->lpni_rcd->rcd_list));
+ list_add(&lp->lpni_rcd->rcd_list,
+ &the_lnet.ln_rcd_deathrow);
+ lp->lpni_rcd = NULL;
+ }
+ }
+
+ /* unlink all RCDs on deathrow list */
+ list_splice_init(&the_lnet.ln_rcd_deathrow, &head);
+
+ if (!list_empty(&head)) {
+ lnet_net_unlock(LNET_LOCK_EX);
+
+ list_for_each_entry(rcd, &head, rcd_list)
+ LNetMDUnlink(rcd->rcd_mdh);
+
+ lnet_net_lock(LNET_LOCK_EX);
+ }
+
+ list_splice_init(&head, &the_lnet.ln_rcd_zombie);
+
+ /* release all zombie RCDs */
+ while (!list_empty(&the_lnet.ln_rcd_zombie)) {
+ list_for_each_entry_safe(rcd, tmp, &the_lnet.ln_rcd_zombie,
+ rcd_list) {
+ if (LNetHandleIsInvalid(rcd->rcd_mdh))
+ list_move(&rcd->rcd_list, &head);
+ }
- while (--npages >= 0)
- cfs_free_page(rb->rb_kiov[npages].kiov_page);
+ wait_unlink = wait_unlink &&
+ !list_empty(&the_lnet.ln_rcd_zombie);
- LIBCFS_FREE(rb, sz);
+ lnet_net_unlock(LNET_LOCK_EX);
+
+ while (!list_empty(&head)) {
+ rcd = list_entry(head.next,
+ lnet_rc_data_t, rcd_list);
+ list_del_init(&rcd->rcd_list);
+ lnet_destroy_rc_data(rcd);
+ }
+
+ if (!wait_unlink)
+ return;
+
+ i++;
+ CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
+ "Waiting for rc buffers to unlink\n");
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(cfs_time_seconds(1) / 4);
+
+ lnet_net_lock(LNET_LOCK_EX);
+ }
+
+ lnet_net_unlock(LNET_LOCK_EX);
}
-lnet_rtrbuf_t *
-lnet_new_rtrbuf(lnet_rtrbufpool_t *rbp)
+/*
+ * This function is called to check if the RC should block indefinitely.
+ * It's called from lnet_router_checker() as well as being passed to
+ * wait_event_interruptible() to avoid the lost wake_up problem.
+ *
+ * When it's called from wait_event_interruptible() it is necessary to
+ * also not sleep if the rc state is not running to avoid a deadlock
+ * when the system is shutting down
+ */
+static inline bool
+lnet_router_checker_active(void)
{
- int npages = rbp->rbp_npages;
- int sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
- struct page *page;
- lnet_rtrbuf_t *rb;
- int i;
+ if (the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING)
+ return true;
+
+ /* Router Checker thread needs to run when routing is enabled in
+ * order to call lnet_update_ni_status_locked() */
+ if (the_lnet.ln_routing)
+ return true;
- LIBCFS_ALLOC(rb, sz);
+ return !list_empty(&the_lnet.ln_routers) &&
+ (live_router_check_interval > 0 ||
+ dead_router_check_interval > 0);
+}
- rb->rb_pool = rbp;
+static int
+lnet_router_checker(void *arg)
+{
+ struct lnet_peer_ni *rtr;
+ struct list_head *entry;
- for (i = 0; i < npages; i++) {
- page = cfs_alloc_page(CFS_ALLOC_ZERO | CFS_ALLOC_STD);
- if (page == NULL) {
- while (--i >= 0)
- cfs_free_page(rb->rb_kiov[i].kiov_page);
+ cfs_block_allsigs();
- LIBCFS_FREE(rb, sz);
- return NULL;
- }
+ while (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING) {
+ __u64 version;
+ int cpt;
+ int cpt2;
+
+ cpt = lnet_net_lock_current();
+rescan:
+ version = the_lnet.ln_routers_version;
+
+ list_for_each(entry, &the_lnet.ln_routers) {
+ rtr = list_entry(entry, struct lnet_peer_ni,
+ lpni_rtr_list);
+
+ cpt2 = rtr->lpni_cpt;
+ if (cpt != cpt2) {
+ lnet_net_unlock(cpt);
+ cpt = cpt2;
+ lnet_net_lock(cpt);
+ /* the routers list has changed */
+ if (version != the_lnet.ln_routers_version)
+ goto rescan;
+ }
+
+ lnet_ping_router_locked(rtr);
+
+ /* NB dropped lock */
+ if (version != the_lnet.ln_routers_version) {
+ /* the routers list has changed */
+ goto rescan;
+ }
+ }
+
+ if (the_lnet.ln_routing)
+ lnet_update_ni_status_locked();
+
+ lnet_net_unlock(cpt);
+
+ lnet_prune_rc_data(0); /* don't wait for UNLINK */
+
+ /* Call schedule_timeout() here always adds 1 to load average
+ * because kernel counts # active tasks as nr_running
+ * + nr_uninterruptible. */
+ /* if there are any routes then wakeup every second. If
+ * there are no routes then sleep indefinitely until woken
+ * up by a user adding a route */
+ if (!lnet_router_checker_active())
+ wait_event_interruptible(the_lnet.ln_rc_waitq,
+ lnet_router_checker_active());
+ else
+ wait_event_interruptible_timeout(the_lnet.ln_rc_waitq,
+ false,
+ cfs_time_seconds(1));
+ }
- rb->rb_kiov[i].kiov_len = CFS_PAGE_SIZE;
- rb->rb_kiov[i].kiov_offset = 0;
- rb->rb_kiov[i].kiov_page = page;
- }
+ lnet_prune_rc_data(1); /* wait for UNLINK */
- return rb;
+ the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
+ up(&the_lnet.ln_rc_signal);
+ /* The unlink event callback will signal final completion */
+ return 0;
}
void
-lnet_rtrpool_free_bufs(lnet_rtrbufpool_t *rbp)
+lnet_destroy_rtrbuf(lnet_rtrbuf_t *rb, int npages)
{
- int npages = rbp->rbp_npages;
- int nbuffers = 0;
- lnet_rtrbuf_t *rb;
+ int sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
- LASSERT (list_empty(&rbp->rbp_msgs));
- LASSERT (rbp->rbp_credits == rbp->rbp_nbuffers);
+ while (--npages >= 0)
+ __free_page(rb->rb_kiov[npages].kiov_page);
- while (!list_empty(&rbp->rbp_bufs)) {
- LASSERT (rbp->rbp_credits > 0);
+ LIBCFS_FREE(rb, sz);
+}
- rb = list_entry(rbp->rbp_bufs.next,
- lnet_rtrbuf_t, rb_list);
- list_del(&rb->rb_list);
- lnet_destroy_rtrbuf(rb, npages);
- nbuffers++;
- }
+static lnet_rtrbuf_t *
+lnet_new_rtrbuf(lnet_rtrbufpool_t *rbp, int cpt)
+{
+ int npages = rbp->rbp_npages;
+ int sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
+ struct page *page;
+ lnet_rtrbuf_t *rb;
+ int i;
+
+ LIBCFS_CPT_ALLOC(rb, lnet_cpt_table(), cpt, sz);
+ if (rb == NULL)
+ return NULL;
+
+ rb->rb_pool = rbp;
+
+ for (i = 0; i < npages; i++) {
+ page = cfs_page_cpt_alloc(lnet_cpt_table(), cpt,
+ GFP_KERNEL | __GFP_ZERO);
+ if (page == NULL) {
+ while (--i >= 0)
+ __free_page(rb->rb_kiov[i].kiov_page);
+
+ LIBCFS_FREE(rb, sz);
+ return NULL;
+ }
+
+ rb->rb_kiov[i].kiov_len = PAGE_SIZE;
+ rb->rb_kiov[i].kiov_offset = 0;
+ rb->rb_kiov[i].kiov_page = page;
+ }
- LASSERT (rbp->rbp_nbuffers == nbuffers);
- LASSERT (rbp->rbp_credits == nbuffers);
+ return rb;
+}
- rbp->rbp_nbuffers = rbp->rbp_credits = 0;
+static void
+lnet_rtrpool_free_bufs(lnet_rtrbufpool_t *rbp, int cpt)
+{
+ int npages = rbp->rbp_npages;
+ lnet_rtrbuf_t *rb;
+ struct list_head tmp;
+
+ if (rbp->rbp_nbuffers == 0) /* not initialized or already freed */
+ return;
+
+ INIT_LIST_HEAD(&tmp);
+
+ lnet_net_lock(cpt);
+ lnet_drop_routed_msgs_locked(&rbp->rbp_msgs, cpt);
+ list_splice_init(&rbp->rbp_bufs, &tmp);
+ rbp->rbp_req_nbuffers = 0;
+ rbp->rbp_nbuffers = rbp->rbp_credits = 0;
+ rbp->rbp_mincredits = 0;
+ lnet_net_unlock(cpt);
+
+ /* Free buffers on the free list. */
+ while (!list_empty(&tmp)) {
+ rb = list_entry(tmp.next, lnet_rtrbuf_t, rb_list);
+ list_del(&rb->rb_list);
+ lnet_destroy_rtrbuf(rb, npages);
+ }
}
-int
-lnet_rtrpool_alloc_bufs(lnet_rtrbufpool_t *rbp, int nbufs)
+static int
+lnet_rtrpool_adjust_bufs(lnet_rtrbufpool_t *rbp, int nbufs, int cpt)
{
- lnet_rtrbuf_t *rb;
- int i;
-
- if (rbp->rbp_nbuffers != 0) {
- LASSERT (rbp->rbp_nbuffers == nbufs);
- return 0;
- }
-
- for (i = 0; i < nbufs; i++) {
- rb = lnet_new_rtrbuf(rbp);
-
- if (rb == NULL) {
- CERROR("Failed to allocate %d router bufs of %d pages\n",
- nbufs, rbp->rbp_npages);
- return -ENOMEM;
- }
-
- rbp->rbp_nbuffers++;
- rbp->rbp_credits++;
- rbp->rbp_mincredits++;
- list_add(&rb->rb_list, &rbp->rbp_bufs);
-
- /* No allocation "under fire" */
- /* Otherwise we'd need code to schedule blocked msgs etc */
- LASSERT (!the_lnet.ln_routing);
- }
-
- LASSERT (rbp->rbp_credits == nbufs);
- return 0;
+ struct list_head rb_list;
+ lnet_rtrbuf_t *rb;
+ int num_rb;
+ int num_buffers = 0;
+ int old_req_nbufs;
+ int npages = rbp->rbp_npages;
+
+ lnet_net_lock(cpt);
+ /* If we are called for less buffers than already in the pool, we
+ * just lower the req_nbuffers number and excess buffers will be
+ * thrown away as they are returned to the free list. Credits
+ * then get adjusted as well.
+ * If we already have enough buffers allocated to serve the
+ * increase requested, then we can treat that the same way as we
+ * do the decrease. */
+ num_rb = nbufs - rbp->rbp_nbuffers;
+ if (nbufs <= rbp->rbp_req_nbuffers || num_rb <= 0) {
+ rbp->rbp_req_nbuffers = nbufs;
+ lnet_net_unlock(cpt);
+ return 0;
+ }
+ /* store the older value of rbp_req_nbuffers and then set it to
+ * the new request to prevent lnet_return_rx_credits_locked() from
+ * freeing buffers that we need to keep around */
+ old_req_nbufs = rbp->rbp_req_nbuffers;
+ rbp->rbp_req_nbuffers = nbufs;
+ lnet_net_unlock(cpt);
+
+ INIT_LIST_HEAD(&rb_list);
+
+ /* allocate the buffers on a local list first. If all buffers are
+ * allocated successfully then join this list to the rbp buffer
+ * list. If not then free all allocated buffers. */
+ while (num_rb-- > 0) {
+ rb = lnet_new_rtrbuf(rbp, cpt);
+ if (rb == NULL) {
+ CERROR("Failed to allocate %d route bufs of %d pages\n",
+ nbufs, npages);
+
+ lnet_net_lock(cpt);
+ rbp->rbp_req_nbuffers = old_req_nbufs;
+ lnet_net_unlock(cpt);
+
+ goto failed;
+ }
+
+ list_add(&rb->rb_list, &rb_list);
+ num_buffers++;
+ }
+
+ lnet_net_lock(cpt);
+
+ list_splice_tail(&rb_list, &rbp->rbp_bufs);
+ rbp->rbp_nbuffers += num_buffers;
+ rbp->rbp_credits += num_buffers;
+ rbp->rbp_mincredits = rbp->rbp_credits;
+ /* We need to schedule blocked msg using the newly
+ * added buffers. */
+ while (!list_empty(&rbp->rbp_bufs) &&
+ !list_empty(&rbp->rbp_msgs))
+ lnet_schedule_blocked_locked(rbp);
+
+ lnet_net_unlock(cpt);
+
+ return 0;
+
+failed:
+ while (!list_empty(&rb_list)) {
+ rb = list_entry(rb_list.next, lnet_rtrbuf_t, rb_list);
+ list_del(&rb->rb_list);
+ lnet_destroy_rtrbuf(rb, npages);
+ }
+
+ return -ENOMEM;
}
-void
+static void
lnet_rtrpool_init(lnet_rtrbufpool_t *rbp, int npages)
{
- CFS_INIT_LIST_HEAD(&rbp->rbp_msgs);
- CFS_INIT_LIST_HEAD(&rbp->rbp_bufs);
+ INIT_LIST_HEAD(&rbp->rbp_msgs);
+ INIT_LIST_HEAD(&rbp->rbp_bufs);
- rbp->rbp_npages = npages;
- rbp->rbp_credits = 0;
- rbp->rbp_mincredits = 0;
+ rbp->rbp_npages = npages;
+ rbp->rbp_credits = 0;
+ rbp->rbp_mincredits = 0;
}
void
-lnet_free_rtrpools(void)
+lnet_rtrpools_free(int keep_pools)
{
- lnet_rtrpool_free_bufs(&the_lnet.ln_rtrpools[0]);
- lnet_rtrpool_free_bufs(&the_lnet.ln_rtrpools[1]);
- lnet_rtrpool_free_bufs(&the_lnet.ln_rtrpools[2]);
+ lnet_rtrbufpool_t *rtrp;
+ int i;
+
+ if (the_lnet.ln_rtrpools == NULL) /* uninitialized or freed */
+ return;
+
+ cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
+ lnet_rtrpool_free_bufs(&rtrp[LNET_TINY_BUF_IDX], i);
+ lnet_rtrpool_free_bufs(&rtrp[LNET_SMALL_BUF_IDX], i);
+ lnet_rtrpool_free_bufs(&rtrp[LNET_LARGE_BUF_IDX], i);
+ }
+
+ if (!keep_pools) {
+ cfs_percpt_free(the_lnet.ln_rtrpools);
+ the_lnet.ln_rtrpools = NULL;
+ }
}
-void
-lnet_init_rtrpools(void)
+static int
+lnet_nrb_tiny_calculate(void)
{
- int small_pages = 1;
- int large_pages = (LNET_MTU + CFS_PAGE_SIZE - 1) >> CFS_PAGE_SHIFT;
+ int nrbs = LNET_NRB_TINY;
- lnet_rtrpool_init(&the_lnet.ln_rtrpools[0], 0);
- lnet_rtrpool_init(&the_lnet.ln_rtrpools[1], small_pages);
- lnet_rtrpool_init(&the_lnet.ln_rtrpools[2], large_pages);
-}
+ if (tiny_router_buffers < 0) {
+ LCONSOLE_ERROR_MSG(0x10c,
+ "tiny_router_buffers=%d invalid when "
+ "routing enabled\n", tiny_router_buffers);
+ return -EINVAL;
+ }
+ if (tiny_router_buffers > 0)
+ nrbs = tiny_router_buffers;
-int
-lnet_alloc_rtrpools(int im_a_router)
+ nrbs /= LNET_CPT_NUMBER;
+ return max(nrbs, LNET_NRB_TINY_MIN);
+}
+
+static int
+lnet_nrb_small_calculate(void)
{
- int rc;
-
- if (!strcmp(forwarding, "")) {
- /* not set either way */
- if (!im_a_router)
- return 0;
- } else if (!strcmp(forwarding, "disabled")) {
- /* explicitly disabled */
- return 0;
- } else if (!strcmp(forwarding, "enabled")) {
- /* explicitly enabled */
- } else {
- LCONSOLE_ERROR(0x10b, "'forwarding' not set to either "
- "'enabled' or 'disabled'\n");
- return -EINVAL;
- }
-
- if (tiny_router_buffers <= 0) {
- LCONSOLE_ERROR(0x10c, "tiny_router_buffers=%d invalid when "
- "routing enabled\n", tiny_router_buffers);
- rc = -EINVAL;
- goto failed;
- }
-
- rc = lnet_rtrpool_alloc_bufs(&the_lnet.ln_rtrpools[0],
- tiny_router_buffers);
- if (rc != 0)
- goto failed;
-
- if (small_router_buffers <= 0) {
- LCONSOLE_ERROR(0x10d, "small_router_buffers=%d invalid when "
- "routing enabled\n", small_router_buffers);
- rc = -EINVAL;
- goto failed;
- }
-
- rc = lnet_rtrpool_alloc_bufs(&the_lnet.ln_rtrpools[1],
- small_router_buffers);
- if (rc != 0)
- goto failed;
-
- if (large_router_buffers <= 0) {
- LCONSOLE_ERROR(0x10e, "large_router_buffers=%d invalid when "
- "routing enabled\n", large_router_buffers);
- rc = -EINVAL;
- goto failed;
- }
-
- rc = lnet_rtrpool_alloc_bufs(&the_lnet.ln_rtrpools[2],
- large_router_buffers);
- if (rc != 0)
- goto failed;
-
- LNET_LOCK();
- the_lnet.ln_routing = 1;
- LNET_UNLOCK();
-
- return 0;
+ int nrbs = LNET_NRB_SMALL;
- failed:
- lnet_free_rtrpools();
- return rc;
+ if (small_router_buffers < 0) {
+ LCONSOLE_ERROR_MSG(0x10c,
+ "small_router_buffers=%d invalid when "
+ "routing enabled\n", small_router_buffers);
+ return -EINVAL;
+ }
+
+ if (small_router_buffers > 0)
+ nrbs = small_router_buffers;
+
+ nrbs /= LNET_CPT_NUMBER;
+ return max(nrbs, LNET_NRB_SMALL_MIN);
}
-#else
+static int
+lnet_nrb_large_calculate(void)
+{
+ int nrbs = LNET_NRB_LARGE;
+
+ if (large_router_buffers < 0) {
+ LCONSOLE_ERROR_MSG(0x10c,
+ "large_router_buffers=%d invalid when "
+ "routing enabled\n", large_router_buffers);
+ return -EINVAL;
+ }
+
+ if (large_router_buffers > 0)
+ nrbs = large_router_buffers;
+
+ nrbs /= LNET_CPT_NUMBER;
+ return max(nrbs, LNET_NRB_LARGE_MIN);
+}
int
-lnet_peers_start_down(void)
+lnet_rtrpools_alloc(int im_a_router)
{
- return 0;
+ lnet_rtrbufpool_t *rtrp;
+ int nrb_tiny;
+ int nrb_small;
+ int nrb_large;
+ int rc;
+ int i;
+
+ if (!strcmp(forwarding, "")) {
+ /* not set either way */
+ if (!im_a_router)
+ return 0;
+ } else if (!strcmp(forwarding, "disabled")) {
+ /* explicitly disabled */
+ return 0;
+ } else if (!strcmp(forwarding, "enabled")) {
+ /* explicitly enabled */
+ } else {
+ LCONSOLE_ERROR_MSG(0x10b, "'forwarding' not set to either "
+ "'enabled' or 'disabled'\n");
+ return -EINVAL;
+ }
+
+ nrb_tiny = lnet_nrb_tiny_calculate();
+ if (nrb_tiny < 0)
+ return -EINVAL;
+
+ nrb_small = lnet_nrb_small_calculate();
+ if (nrb_small < 0)
+ return -EINVAL;
+
+ nrb_large = lnet_nrb_large_calculate();
+ if (nrb_large < 0)
+ return -EINVAL;
+
+ the_lnet.ln_rtrpools = cfs_percpt_alloc(lnet_cpt_table(),
+ LNET_NRBPOOLS *
+ sizeof(lnet_rtrbufpool_t));
+ if (the_lnet.ln_rtrpools == NULL) {
+ LCONSOLE_ERROR_MSG(0x10c,
+ "Failed to initialize router buffe pool\n");
+ return -ENOMEM;
+ }
+
+ cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
+ lnet_rtrpool_init(&rtrp[LNET_TINY_BUF_IDX], 0);
+ rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
+ nrb_tiny, i);
+ if (rc != 0)
+ goto failed;
+
+ lnet_rtrpool_init(&rtrp[LNET_SMALL_BUF_IDX],
+ LNET_NRB_SMALL_PAGES);
+ rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
+ nrb_small, i);
+ if (rc != 0)
+ goto failed;
+
+ lnet_rtrpool_init(&rtrp[LNET_LARGE_BUF_IDX],
+ LNET_NRB_LARGE_PAGES);
+ rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
+ nrb_large, i);
+ if (rc != 0)
+ goto failed;
+ }
+
+ lnet_net_lock(LNET_LOCK_EX);
+ the_lnet.ln_routing = 1;
+ lnet_net_unlock(LNET_LOCK_EX);
+ return 0;
+
+ failed:
+ lnet_rtrpools_free(0);
+ return rc;
}
-void
-lnet_router_checker_stop(void)
+static int
+lnet_rtrpools_adjust_helper(int tiny, int small, int large)
{
- return;
+ int nrb = 0;
+ int rc = 0;
+ int i;
+ lnet_rtrbufpool_t *rtrp;
+
+ /* If the provided values for each buffer pool are different than the
+ * configured values, we need to take action. */
+ if (tiny >= 0) {
+ tiny_router_buffers = tiny;
+ nrb = lnet_nrb_tiny_calculate();
+ cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
+ rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
+ nrb, i);
+ if (rc != 0)
+ return rc;
+ }
+ }
+ if (small >= 0) {
+ small_router_buffers = small;
+ nrb = lnet_nrb_small_calculate();
+ cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
+ rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
+ nrb, i);
+ if (rc != 0)
+ return rc;
+ }
+ }
+ if (large >= 0) {
+ large_router_buffers = large;
+ nrb = lnet_nrb_large_calculate();
+ cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
+ rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
+ nrb, i);
+ if (rc != 0)
+ return rc;
+ }
+ }
+
+ return 0;
}
int
-lnet_router_checker_start(void)
+lnet_rtrpools_adjust(int tiny, int small, int large)
{
- return 0;
+ /* this function doesn't revert the changes if adding new buffers
+ * failed. It's up to the user space caller to revert the
+ * changes. */
+
+ if (!the_lnet.ln_routing)
+ return 0;
+
+ return lnet_rtrpools_adjust_helper(tiny, small, large);
}
-void
-lnet_free_rtrpools (void)
+int
+lnet_rtrpools_enable(void)
{
+ int rc = 0;
+
+ if (the_lnet.ln_routing)
+ return 0;
+
+ if (the_lnet.ln_rtrpools == NULL)
+ /* If routing is turned off, and we have never
+ * initialized the pools before, just call the
+ * standard buffer pool allocation routine as
+ * if we are just configuring this for the first
+ * time. */
+ rc = lnet_rtrpools_alloc(1);
+ else
+ rc = lnet_rtrpools_adjust_helper(0, 0, 0);
+ if (rc != 0)
+ return rc;
+
+ lnet_net_lock(LNET_LOCK_EX);
+ the_lnet.ln_routing = 1;
+
+ the_lnet.ln_ping_info->pi_features &= ~LNET_PING_FEAT_RTE_DISABLED;
+ lnet_net_unlock(LNET_LOCK_EX);
+
+ return rc;
}
void
-lnet_init_rtrpools (void)
+lnet_rtrpools_disable(void)
{
+ if (!the_lnet.ln_routing)
+ return;
+
+ lnet_net_lock(LNET_LOCK_EX);
+ the_lnet.ln_routing = 0;
+ the_lnet.ln_ping_info->pi_features |= LNET_PING_FEAT_RTE_DISABLED;
+
+ tiny_router_buffers = 0;
+ small_router_buffers = 0;
+ large_router_buffers = 0;
+ lnet_net_unlock(LNET_LOCK_EX);
+ lnet_rtrpools_free(1);
}
int
-lnet_alloc_rtrpools (int im_a_arouter)
+lnet_notify(lnet_ni_t *ni, lnet_nid_t nid, int alive, cfs_time_t when)
{
- return 0;
-}
+ struct lnet_peer_ni *lp = NULL;
+ cfs_time_t now = cfs_time_current();
+ int cpt = lnet_cpt_of_nid(nid, ni);
+
+ 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;
+ }
-#endif
+ /* 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_net_lock(cpt);
+
+ if (the_lnet.ln_shutdown) {
+ lnet_net_unlock(cpt);
+ return -ESHUTDOWN;
+ }
+
+ lp = lnet_find_peer_ni_locked(nid);
+ if (lp == NULL) {
+ /* nid not found */
+ lnet_net_unlock(cpt);
+ CDEBUG(D_NET, "%s not found\n", libcfs_nid2str(nid));
+ return 0;
+ }
+
+ /*
+ * It is possible for this function to be called for the same peer
+ * but with different NIs. We want to synchronize the notification
+ * between the different calls. So we will use the lpni_cpt to
+ * grab the net lock.
+ */
+ if (lp->lpni_cpt != cpt) {
+ lnet_net_unlock(cpt);
+ cpt = lp->lpni_cpt;
+ lnet_net_lock(cpt);
+ }
+
+ /* 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->lpni_last_alive)
+ when = lp->lpni_last_alive;
+
+ lnet_notify_locked(lp, ni == NULL, alive, when);
+
+ if (ni != NULL)
+ lnet_ni_notify_locked(ni, lp);
+
+ lnet_peer_ni_decref_locked(lp);
+
+ lnet_net_unlock(cpt);
+ return 0;
+}
+EXPORT_SYMBOL(lnet_notify);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff