// SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. * * Copyright (c) 2011, 2017, Intel Corporation. */ /* This file is part of Lustre, http://www.lustre.org/ */ #define DEBUG_SUBSYSTEM S_LNET #include #include #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 = ""; 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; module_param(auto_down, int, 0444); MODULE_PARM_DESC(auto_down, "Automatically mark peers down on comms error"); 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; } 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"); 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)"); int dead_router_check_interval = INT_MIN; module_param(dead_router_check_interval, int, 0444); MODULE_PARM_DESC(dead_router_check_interval, "(DEPRECATED - Use alive_router_check_interval)"); int live_router_check_interval = INT_MIN; module_param(live_router_check_interval, int, 0444); MODULE_PARM_DESC(live_router_check_interval, "(DEPRECATED - Use alive_router_check_interval)"); int alive_router_check_interval = 60; module_param(alive_router_check_interval, int, 0644); MODULE_PARM_DESC(alive_router_check_interval, "Seconds between live router health checks (<= 0 to disable)"); static int router_ping_timeout = 50; module_param(router_ping_timeout, int, 0644); MODULE_PARM_DESC(router_ping_timeout, "Seconds to wait for the reply to a router health query"); /* * A value between 0 and 100. 0 meaning that even if router's interfaces * have the worse health still consider the gateway usable. * 100 means that at least one interface on the route's remote net is 100% * healthy to consider the route alive. * The default is set to 100 to ensure we maintain the original behavior. */ unsigned int router_sensitivity_percentage = 100; static int rtr_sensitivity_set(const char *val, cfs_kernel_param_arg_t *kp); static struct kernel_param_ops param_ops_rtr_sensitivity = { .set = rtr_sensitivity_set, .get = param_get_int, }; #define param_check_rtr_sensitivity(name, p) \ __param_check(name, p, int) #ifdef HAVE_KERNEL_PARAM_OPS module_param(router_sensitivity_percentage, rtr_sensitivity, S_IRUGO|S_IWUSR); #else module_param_call(router_sensitivity_percentage, rtr_sensitivity_set, param_get_int, &router_sensitivity_percentage, S_IRUGO|S_IWUSR); #endif MODULE_PARM_DESC(router_sensitivity_percentage, "How healthy a gateway should be to be used in percent"); static void lnet_add_route_to_rnet(struct lnet_remotenet *rnet, struct lnet_route *route); static void lnet_del_route_from_rnet(struct lnet_nid *gw_nid, struct list_head *route_list, struct list_head *zombies); static int rtr_sensitivity_set(const char *val, cfs_kernel_param_arg_t *kp) { int rc; unsigned *sen = (unsigned *)kp->arg; unsigned long value; rc = kstrtoul(val, 0, &value); if (rc) { CERROR("Invalid module parameter value for 'router_sensitivity_percentage'\n"); return rc; } if (value < 0 || value > 100) { CERROR("Invalid value: %lu for 'router_sensitivity_percentage'\n", value); return -EINVAL; } /* * The purpose of locking the api_mutex here is to ensure that * the correct value ends up stored properly. */ mutex_lock(&the_lnet.ln_api_mutex); *sen = value; mutex_unlock(&the_lnet.ln_api_mutex); return 0; } void lnet_move_route(struct lnet_route *route, struct lnet_peer *lp, struct list_head *rt_list) __must_hold(&the_lnet.ln_api_mutex) { struct lnet_remotenet *rnet; struct list_head zombies; struct list_head *l; INIT_LIST_HEAD(&zombies); if (rt_list) l = rt_list; else l = &zombies; rnet = lnet_find_rnet_locked(route->lr_net); LASSERT(rnet); CDEBUG(D_NET, "deleting route %s->%s\n", libcfs_net2str(route->lr_net), libcfs_nidstr(&route->lr_nid)); /* * use the gateway's lp_primary_nid to delete the route as the * lr_nid can be a constituent NID of the peer */ lnet_del_route_from_rnet( &route->lr_gateway->lp_primary_nid, &rnet->lrn_routes, l); if (lp) { route = list_first_entry(l, struct lnet_route, lr_list); route->lr_gateway = lp; lnet_add_route_to_rnet(rnet, route); } else { while (!list_empty(l) && !rt_list) { route = list_first_entry(l, struct lnet_route, lr_list); list_del(&route->lr_list); LIBCFS_FREE(route, sizeof(*route)); } } } void lnet_rtr_transfer_to_peer(struct lnet_peer *src, struct lnet_peer *target) { struct lnet_route *route; struct lnet_route *tmp, *tmp2; lnet_net_lock(LNET_LOCK_EX); CDEBUG(D_NET, "transfering routes from %s -> %s\n", libcfs_nidstr(&src->lp_primary_nid), libcfs_nidstr(&target->lp_primary_nid)); list_for_each_entry(route, &src->lp_routes, lr_gwlist) { CDEBUG(D_NET, "%s: %s->%s\n", libcfs_nidstr(&src->lp_primary_nid), libcfs_net2str(route->lr_net), libcfs_nidstr(&route->lr_nid)); } list_splice_init(&src->lp_rtrq, &target->lp_rtrq); list_for_each_entry_safe(route, tmp, &src->lp_routes, lr_gwlist) { struct lnet_route *r2; bool present = false; list_for_each_entry_safe(r2, tmp2, &target->lp_routes, lr_gwlist) { if (route->lr_net == r2->lr_net) { if (route->lr_priority >= r2->lr_priority) present = true; else if (route->lr_hops >= r2->lr_hops) present = true; else lnet_move_route(r2, NULL, NULL); } } if (present) lnet_move_route(route, NULL, NULL); else lnet_move_route(route, target, NULL); } if (list_empty(&target->lp_rtr_list)) { lnet_peer_addref_locked(target); list_add_tail(&target->lp_rtr_list, &the_lnet.ln_routers); } the_lnet.ln_routers_version++; lnet_net_unlock(LNET_LOCK_EX); } int lnet_peers_start_down(void) { return check_routers_before_use; } /* * The peer_net of a gateway is alive if at least one of the peer_ni's on * that peer_net is alive. */ static bool lnet_is_gateway_net_alive(struct lnet_peer_net *lpn) { struct lnet_peer_ni *lpni; list_for_each_entry(lpni, &lpn->lpn_peer_nis, lpni_peer_nis) { if (lnet_is_peer_ni_alive(lpni)) return true; } return false; } /* * a gateway is alive only if all its nets are alive * called with cpt lock held */ bool lnet_is_gateway_alive(struct lnet_peer *gw) { struct lnet_peer_net *lpn; if (!gw->lp_alive) return false; list_for_each_entry(lpn, &gw->lp_peer_nets, lpn_peer_nets) { if (!lnet_is_gateway_net_alive(lpn)) return false; } return true; } /* * lnet_is_route_alive() needs to be called with cpt lock held * A route is alive if the gateway can route between the local network and * the remote network of the route. * This means at least one NI is alive on each of the local and remote * networks of the gateway. */ bool lnet_is_route_alive(struct lnet_route *route) { struct lnet_peer *gw = route->lr_gateway; struct lnet_peer_net *llpn; struct lnet_peer_net *rlpn; /* If the gateway is down then all routes are considered down */ if (!gw->lp_alive) return false; /* * if discovery is disabled then rely on the cached aliveness * information. This is handicapped information which we log when * we receive the discovery ping response. The most uptodate * aliveness information can only be obtained when discovery is * enabled. */ if (lnet_is_discovery_disabled(gw)) return atomic_read(&route->lr_alive) == 1; /* * check the gateway's interfaces on the local network */ llpn = lnet_peer_get_net_locked(gw, route->lr_lnet); if (!llpn) return false; if (!lnet_is_gateway_net_alive(llpn)) return false; /* * For single hop routes avoid_asym_router_failure dictates * that the remote net must exist on the gateway. For multi-hop * routes the next-hop will not have the remote net. */ if (avoid_asym_router_failure && (route->lr_hops == 1 || route->lr_single_hop)) { rlpn = lnet_peer_get_net_locked(gw, route->lr_net); if (!rlpn) return false; if (!lnet_is_gateway_net_alive(rlpn)) return false; } spin_lock(&gw->lp_lock); if (!(gw->lp_state & LNET_PEER_ROUTER_ENABLED)) { spin_unlock(&gw->lp_lock); if (gw->lp_rtr_refcount > 0) CERROR("peer %s is being used as a gateway but routing feature is not turned on\n", libcfs_nidstr(&gw->lp_primary_nid)); return false; } spin_unlock(&gw->lp_lock); return true; } void lnet_consolidate_routes_locked(struct lnet_peer *orig_lp, struct lnet_peer *new_lp) { struct lnet_peer_ni *lpni; struct lnet_route *route; /* * Although a route is correlated with a peer, but when it's added * a specific NID is used. That NID refers to a peer_ni within * a peer. There could be other peer_nis on the same net, which * can be used to send to that gateway. However when we are * consolidating gateways because of discovery, the nid used to * add the route might've moved between gateway peers. In this * case we want to move the route to the new gateway as well. The * intent here is not to confuse the user who added the route. */ list_for_each_entry(route, &orig_lp->lp_routes, lr_gwlist) { lpni = lnet_peer_ni_get_locked(orig_lp, &route->lr_nid); if (!lpni) { lnet_net_lock(LNET_LOCK_EX); list_move(&route->lr_gwlist, &new_lp->lp_routes); lnet_net_unlock(LNET_LOCK_EX); } } } static inline void lnet_check_route_inconsistency(struct lnet_route *route) { if (!route->lr_single_hop && route->lr_hops == 1 && avoid_asym_router_failure) { CWARN("route %s->%s is detected to be multi-hop but hop count is set to %d\n", libcfs_net2str(route->lr_net), libcfs_nidstr(&route->lr_gateway->lp_primary_nid), (int) route->lr_hops); } } /* Routes are added and removed under both ln_api_mutex and net_lock/EX * Since we are not modifying anything we simply require the ln_api_mutex be * held so that things are not modified underneath us */ void lnet_router_discovery_ping_reply(struct lnet_peer *lp, struct lnet_ping_buffer *pbuf) __must_hold(&the_lnet.ln_api_mutex) { struct lnet_ping_iter piter; struct lnet_peer_net *llpn; struct lnet_route *route; struct lnet_nid nid; bool single_hop = false; bool net_up = false; u32 *stp; if (pbuf->pb_info.pi_features & LNET_PING_FEAT_RTE_DISABLED) { CERROR("Peer %s is being used as a gateway but routing feature is not turned on\n", libcfs_nidstr(&lp->lp_primary_nid)); list_for_each_entry(route, &lp->lp_routes, lr_gwlist) lnet_set_route_aliveness(route, false); return; } CDEBUG(D_NET, "Processing reply for gw: %s nnis %d\n", libcfs_nidstr(&lp->lp_primary_nid), pbuf->pb_info.pi_nnis); /* examine the ping response to determine if the routes on that * gateway should be declared alive. * The route is alive if: * 1. local network to reach the route is alive and * 2. route is single hop, avoid_async_router_failure is set and * there exists at least one NI on the route's remote net */ list_for_each_entry(route, &lp->lp_routes, lr_gwlist) { llpn = lnet_peer_get_net_locked(lp, route->lr_lnet); if (!llpn) { lnet_set_route_aliveness(route, false); continue; } if (!lnet_is_gateway_net_alive(llpn)) { lnet_set_route_aliveness(route, false); continue; } single_hop = net_up = false; for (stp = ping_iter_first(&piter, pbuf, &nid); stp; stp = ping_iter_next(&piter, &nid)) { if (route->lr_net == LNET_NID_NET(&nid)) { single_hop = true; if (*stp == LNET_NI_STATUS_UP) { net_up = true; break; } } } route->lr_single_hop = single_hop; if (avoid_asym_router_failure && (route->lr_hops == 1 || route->lr_single_hop)) lnet_set_route_aliveness(route, net_up); else lnet_set_route_aliveness(route, true); /* * warn that the route is configured as single-hop but it * really is multi-hop as far as we can tell. */ lnet_check_route_inconsistency(route); } } void lnet_router_discovery_complete(struct lnet_peer *lp) { struct lnet_peer_ni *lpni = NULL; struct lnet_route *route; spin_lock(&lp->lp_lock); lp->lp_state &= ~LNET_PEER_RTR_DISCOVERY; lp->lp_state |= LNET_PEER_RTR_DISCOVERED; lp->lp_alive = lp->lp_dc_error == 0; spin_unlock(&lp->lp_lock); if (!lp->lp_dc_error) return; /* * We do not send messages directly to the remote interfaces * of an LNet router. As such, we rely on the PING response * to determine the up/down status of these interfaces. If * a PING response is not receieved, or some other problem with * discovery occurs that prevents us from getting this status, * we assume all interfaces are down until we're able to * determine otherwise. */ CDEBUG(D_NET, "%s: Router discovery failed %d\n", libcfs_nidstr(&lp->lp_primary_nid), lp->lp_dc_error); while ((lpni = lnet_get_next_peer_ni_locked(lp, NULL, lpni)) != NULL) lpni->lpni_ns_status = LNET_NI_STATUS_DOWN; list_for_each_entry(route, &lp->lp_routes, lr_gwlist) lnet_set_route_aliveness(route, false); } static void lnet_rtr_addref_locked(struct lnet_peer *lp) { LASSERT(lp->lp_rtr_refcount >= 0); /* lnet_net_lock must be exclusively locked */ lp->lp_rtr_refcount++; if (lp->lp_rtr_refcount == 1) { list_add_tail(&lp->lp_rtr_list, &the_lnet.ln_routers); /* addref for the_lnet.ln_routers */ lnet_peer_addref_locked(lp); the_lnet.ln_routers_version++; } } static void lnet_rtr_decref_locked(struct lnet_peer *lp) { LASSERT(atomic_read(&lp->lp_refcount) > 0); LASSERT(lp->lp_rtr_refcount > 0); /* lnet_net_lock must be exclusively locked */ lp->lp_rtr_refcount--; if (lp->lp_rtr_refcount == 0) { LASSERT(list_empty(&lp->lp_routes)); list_del(&lp->lp_rtr_list); /* decref for the_lnet.ln_routers */ lnet_peer_decref_locked(lp); the_lnet.ln_routers_version++; } } struct lnet_remotenet * lnet_find_rnet_locked(__u32 net) { struct lnet_remotenet *rnet; struct list_head *rn_list; LASSERT(the_lnet.ln_state == LNET_STATE_RUNNING); rn_list = lnet_net2rnethash(net); list_for_each_entry(rnet, rn_list, lrn_list) { if (rnet->lrn_net == net) return rnet; } return NULL; } static void lnet_shuffle_seed(void) { static int seeded; struct lnet_ni *ni = NULL; if (seeded) return; /* 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))) add_device_randomness(&ni->ni_nid, sizeof(ni->ni_nid)); seeded = 1; } /* NB expects LNET_LOCK held */ static void lnet_add_route_to_rnet(struct lnet_remotenet *rnet, struct lnet_route *route) { struct lnet_peer_net *lpn; unsigned int offset = 0; unsigned int len = 0; struct list_head *e; time64_t now; lnet_shuffle_seed(); list_for_each(e, &rnet->lrn_routes) len++; /* * Randomly adding routes to the list is done to ensure that when * different nodes are using the same list of routers, they end up * preferring different routers. */ offset = get_random_u32_below(len + 1); list_for_each(e, &rnet->lrn_routes) { if (offset == 0) break; offset--; } list_add(&route->lr_list, e); /* * force a router check on the gateway to make sure the route is * alive */ now = ktime_get_real_seconds(); list_for_each_entry(lpn, &route->lr_gateway->lp_peer_nets, lpn_peer_nets) { lpn->lpn_next_ping = now; } the_lnet.ln_remote_nets_version++; /* add the route on the gateway list */ list_add(&route->lr_gwlist, &route->lr_gateway->lp_routes); /* take a router reference count on the gateway */ lnet_rtr_addref_locked(route->lr_gateway); } int lnet_add_route(__u32 net, __u32 hops, struct lnet_nid *gateway, __u32 priority, __u32 sensitivity) __must_hold(&the_lnet.ln_api_mutex) { struct list_head *route_entry; struct lnet_remotenet *rnet; struct lnet_remotenet *rnet2; struct lnet_route *route; struct lnet_peer_ni *lpni; struct lnet_peer *gw; int add_route; int rc; CDEBUG(D_NET, "Add route: remote net %s hops %d priority %u gw %s\n", libcfs_net2str(net), hops, priority, libcfs_nidstr(gateway)); if (LNET_NID_IS_ANY(gateway) || nid_is_lo0(gateway) || net == LNET_NET_ANY || LNET_NETTYP(net) == LOLND || LNET_NID_NET(gateway) == net || (hops != LNET_UNDEFINED_HOPS && (hops < 1 || hops > 255))) return -EINVAL; /* it's a local network */ if (lnet_islocalnet(net)) return -EEXIST; if (!lnet_islocalnet(LNET_NID_NET(gateway))) { CERROR("Cannot add route with gateway %s. There is no local interface configured on LNet %s\n", libcfs_nidstr(gateway), libcfs_net2str(LNET_NID_NET(gateway))); return -EHOSTUNREACH; } /* 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_nidstr(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; /* store the local and remote net that the route represents */ route->lr_lnet = LNET_NID_NET(gateway); route->lr_net = net; route->lr_nid = *gateway; route->lr_priority = priority; route->lr_hops = hops; if (lnet_peers_start_down()) atomic_set(&route->lr_alive, 0); else atomic_set(&route->lr_alive, 1); lnet_net_lock(LNET_LOCK_EX); /* * lnet_nid2peerni_ex() grabs a ref on the lpni. We will need to * lose that once we're done */ lpni = lnet_nid2peerni_ex(gateway); if (IS_ERR(lpni)) { lnet_net_unlock(LNET_LOCK_EX); LIBCFS_FREE(route, sizeof(*route)); LIBCFS_FREE(rnet, sizeof(*rnet)); rc = PTR_ERR(lpni); CERROR("Error %d creating route %s %d %s\n", rc, libcfs_net2str(net), hops, libcfs_nidstr(gateway)); return rc; } LASSERT(lpni); LASSERT(lpni->lpni_peer_net); LASSERT(lpni->lpni_peer_net->lpn_peer); gw = lpni->lpni_peer_net->lpn_peer; route->lr_gateway = gw; 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(route_entry, &rnet2->lrn_routes) { struct lnet_route *route2; route2 = list_entry(route_entry, struct lnet_route, lr_list); if (route2->lr_gateway == route->lr_gateway) { add_route = 0; break; } /* our lookups must be true */ LASSERT(!nid_same(&route2->lr_gateway->lp_primary_nid, gateway)); } /* * It is possible to add multiple routes through the same peer, * but it'll be using a different NID of that peer. When the * gateway is discovered, discovery will consolidate the different * peers into one peer. In this case the discovery code will have * to move the routes from the peer that's being deleted to the * consolidated peer lp_routes list */ if (add_route) { gw->lp_health_sensitivity = sensitivity; lnet_add_route_to_rnet(rnet2, route); if (lnet_peer_discovery_disabled) CWARN("Consider turning discovery on to enable full Multi-Rail routing functionality\n"); } /* * get rid of the reference on the lpni. */ lnet_peer_ni_decref_locked(lpni); lnet_net_unlock(LNET_LOCK_EX); /* If avoid_asym_router_failure is enabled and hop count is not * set to 1 for a route that is actually single-hop, then the * feature will fail to prevent the router from being selected * if it is missing a NI on the remote network due to misconfiguration. */ if (avoid_asym_router_failure && hops == LNET_UNDEFINED_HOPS) CWARN("Use hops = 1 for a single-hop route when avoid_asym_router_failure feature is enabled\n"); rc = 0; if (!add_route) { rc = -EEXIST; LIBCFS_FREE(route, sizeof(*route)); } if (rnet != rnet2) LIBCFS_FREE(rnet, sizeof(*rnet)); /* kick start the monitor thread to handle the added route */ complete(&the_lnet.ln_mt_wait_complete); return rc; } void lnet_del_route_from_rnet(struct lnet_nid *gw_nid, struct list_head *route_list, struct list_head *zombies) { struct lnet_peer *gateway; struct lnet_route *route; struct lnet_route *tmp; list_for_each_entry_safe(route, tmp, route_list, lr_list) { gateway = route->lr_gateway; if (gw_nid && !nid_same(gw_nid, &gateway->lp_primary_nid)) continue; /* * move to zombie to delete outside the lock * Note that this function is called with the * ln_api_mutex held as well as the exclusive net * lock. Adding to the remote net list happens * under the same conditions. Same goes for the * gateway router list */ list_move(&route->lr_list, zombies); the_lnet.ln_remote_nets_version++; list_del(&route->lr_gwlist); lnet_rtr_decref_locked(gateway); } } int lnet_del_route(__u32 net, struct lnet_nid *gw) __must_hold(&the_lnet.ln_api_mutex) { LIST_HEAD(rnet_zombies); struct lnet_remotenet *rnet; struct lnet_remotenet *tmp; struct list_head *rn_list; struct lnet_peer_ni *lpni; struct lnet_route *route; struct lnet_nid gw_nid; LIST_HEAD(zombies); struct lnet_peer *lp = NULL; int i = 0; CDEBUG(D_NET, "Del route: net %s : gw %s\n", libcfs_net2str(net), libcfs_nidstr(gw)); /* 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 (gw) lpni = lnet_peer_ni_find_locked(gw); else lpni = NULL; if (lpni) { lp = lpni->lpni_peer_net->lpn_peer; LASSERT(lp); gw_nid = lp->lp_primary_nid; gw = &gw_nid; } if (net != LNET_NET_ANY) { rnet = lnet_find_rnet_locked(net); if (!rnet) { if (lpni) lnet_peer_ni_decref_locked(lpni); lnet_net_unlock(LNET_LOCK_EX); return -ENOENT; } lnet_del_route_from_rnet(gw, &rnet->lrn_routes, &zombies); if (list_empty(&rnet->lrn_routes)) list_move(&rnet->lrn_list, &rnet_zombies); goto delete_zombies; } for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) { rn_list = &the_lnet.ln_remote_nets_hash[i]; list_for_each_entry_safe(rnet, tmp, rn_list, lrn_list) { lnet_del_route_from_rnet(gw, &rnet->lrn_routes, &zombies); if (list_empty(&rnet->lrn_routes)) list_move(&rnet->lrn_list, &rnet_zombies); } } delete_zombies: /* * check if there are any routes remaining on the gateway * If there are no more routes make sure to set the peer's * lp_disc_net_id to 0 (invalid), in case we add more routes in * the future on that gateway, then we start our discovery process * from scratch */ if (lpni) { if (list_empty(&lp->lp_routes)) lp->lp_disc_net_id = 0; lnet_peer_ni_decref_locked(lpni); } lnet_net_unlock(LNET_LOCK_EX); while (!list_empty(&zombies)) { route = list_first_entry(&zombies, struct lnet_route, lr_list); list_del(&route->lr_list); LIBCFS_FREE(route, sizeof(*route)); } while (!list_empty(&rnet_zombies)) { rnet = list_first_entry(&rnet_zombies, struct lnet_remotenet, lrn_list); list_del(&rnet->lrn_list); LIBCFS_FREE(rnet, sizeof(*rnet)); } return 0; } void lnet_destroy_routes(void) { lnet_del_route(LNET_NET_ANY, NULL); } int lnet_get_rtr_pool_cfg(int cpt, struct lnet_ioctl_pool_cfg *pool_cfg) { struct lnet_rtrbufpool *rbp; int i, rc = -ENOENT, j; if (the_lnet.ln_rtrpools == NULL) return rc; cfs_percpt_for_each(rbp, i, the_lnet.ln_rtrpools) { if (i != cpt) continue; lnet_net_lock(i); for (j = 0; j < LNET_NRBPOOLS; j++) { pool_cfg->pl_pools[j].pl_npages = rbp[j].rbp_npages; pool_cfg->pl_pools[j].pl_nbuffers = rbp[j].rbp_nbuffers; pool_cfg->pl_pools[j].pl_credits = rbp[j].rbp_credits; pool_cfg->pl_pools[j].pl_mincredits = rbp[j].rbp_mincredits; } lnet_net_unlock(i); rc = 0; break; } 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 *flags, __u32 *priority, __u32 *sensitivity) { struct lnet_remotenet *rnet; struct list_head *rn_list; struct lnet_route *route; int cpt; 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_entry(rnet, rn_list, lrn_list) { list_for_each_entry(route, &rnet->lrn_routes, lr_list) { if (idx-- == 0) { *net = rnet->lrn_net; *gateway = lnet_nid_to_nid4(&route->lr_nid); *hops = route->lr_hops; *priority = route->lr_priority; *sensitivity = route->lr_gateway-> lp_health_sensitivity; if (lnet_is_route_alive(route)) *flags |= LNET_RT_ALIVE; else *flags &= ~LNET_RT_ALIVE; if (route->lr_single_hop) *flags &= ~LNET_RT_MULTI_HOP; else *flags |= LNET_RT_MULTI_HOP; lnet_net_unlock(cpt); return 0; } } } } lnet_net_unlock(cpt); return -ENOENT; } static void lnet_wait_known_routerstate(void) { struct lnet_peer *rtr; int all_known; LASSERT(the_lnet.ln_mt_state == LNET_MT_STATE_RUNNING); for (;;) { int cpt = lnet_net_lock_current(); all_known = 1; list_for_each_entry(rtr, &the_lnet.ln_routers, lp_rtr_list) { spin_lock(&rtr->lp_lock); if ((rtr->lp_state & LNET_PEER_RTR_DISCOVERED) == 0) { all_known = 0; spin_unlock(&rtr->lp_lock); break; } spin_unlock(&rtr->lp_lock); } lnet_net_unlock(cpt); if (all_known) return; schedule_timeout_uninterruptible(cfs_time_seconds(1)); } } static inline bool lnet_net_set_status_locked(struct lnet_net *net, __u32 status) { struct lnet_ni *ni; bool update = false; list_for_each_entry(ni, &net->net_ni_list, ni_netlist) if (lnet_ni_set_status(ni, status)) update = true; return update; } static bool lnet_update_ni_status_locked(void) { struct lnet_net *net; struct lnet_ni *ni; bool push = false; time64_t now; time64_t timeout; LASSERT(the_lnet.ln_routing); timeout = router_ping_timeout + alive_router_check_interval; now = ktime_get_seconds(); list_for_each_entry(net, &the_lnet.ln_nets, net_list) { if (net->net_lnd->lnd_type == LOLND) continue; if (now < net->net_last_alive + timeout) goto check_ni_fatal; spin_lock(&net->net_lock); /* re-check with lock */ if (now < net->net_last_alive + timeout) { spin_unlock(&net->net_lock); goto check_ni_fatal; } spin_unlock(&net->net_lock); /* * if the net didn't receive any traffic for past the * timeout on any of its constituent NIs, then mark all * the NIs down. */ if (lnet_net_set_status_locked(net, LNET_NI_STATUS_DOWN)) { push = true; continue; } check_ni_fatal: list_for_each_entry(ni, &net->net_ni_list, ni_netlist) { /* lnet_ni_set_status() will perform the same check of * ni_status while holding the ni lock. We can safely * check ni_status without that lock because it is only * written to under net_lock/EX and our caller is * holding a net lock. */ if (atomic_read(&ni->ni_fatal_error_on) && ni->ni_status && *ni->ni_status != LNET_NI_STATUS_DOWN && lnet_ni_set_status(ni, LNET_NI_STATUS_DOWN)) push = true; } } return push; } void lnet_wait_router_start(void) { 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(); } } /* * This function is called from the monitor thread to check if there are * any active routers that need to be checked. */ bool lnet_router_checker_active(void) { /* 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; return !list_empty(&the_lnet.ln_routers) && alive_router_check_interval > 0; } void lnet_check_routers(void) { struct lnet_peer_net *first_lpn; struct lnet_peer_net *lpn; struct lnet_peer_ni *lpni; struct lnet_peer *rtr; bool push = false; bool needs_ping; bool found_lpn; __u64 version; __u32 net_id; time64_t now; int cpt; int rc; cpt = lnet_net_lock_current(); rescan: version = the_lnet.ln_routers_version; list_for_each_entry(rtr, &the_lnet.ln_routers, lp_rtr_list) { /* If we're currently discovering the peer then don't * issue another discovery */ if (rtr->lp_state & LNET_PEER_RTR_DISCOVERY) continue; now = ktime_get_real_seconds(); /* find the next local peer net which needs to be ping'd */ needs_ping = false; first_lpn = NULL; found_lpn = false; net_id = rtr->lp_disc_net_id; do { lpn = lnet_get_next_peer_net_locked(rtr, net_id); if (!lpn) { CERROR("gateway %s has no networks\n", libcfs_nidstr(&rtr->lp_primary_nid)); break; } /* We looped back to the first peer net */ if (first_lpn == lpn) break; if (!first_lpn) first_lpn = lpn; net_id = lpn->lpn_net_id; if (!lnet_islocalnet_locked(net_id)) continue; found_lpn = true; CDEBUG(D_NET, "rtr %s(%p) %s(%p) next ping %lld\n", libcfs_nidstr(&rtr->lp_primary_nid), rtr, libcfs_net2str(net_id), lpn, lpn->lpn_next_ping); needs_ping = now >= lpn->lpn_next_ping; } while (!needs_ping); if (!found_lpn || !lpn) { CERROR("no local network found for gateway %s\n", libcfs_nidstr(&rtr->lp_primary_nid)); continue; } if (!needs_ping) continue; spin_lock(&rtr->lp_lock); /* make sure we fully discover the router */ rtr->lp_state &= ~LNET_PEER_NIDS_UPTODATE; rtr->lp_state |= LNET_PEER_FORCE_PING | LNET_PEER_FORCE_PUSH | LNET_PEER_RTR_DISCOVERY; spin_unlock(&rtr->lp_lock); /* find the peer_ni associated with the primary NID */ lpni = lnet_peer_ni_get_locked(rtr, &rtr->lp_primary_nid); if (!lpni) { CDEBUG(D_NET, "Expected to find an lpni for %s, but non found\n", libcfs_nidstr(&rtr->lp_primary_nid)); continue; } lnet_peer_ni_addref_locked(lpni); /* specify the net to use */ rtr->lp_disc_net_id = lpn->lpn_net_id; /* discover the router */ CDEBUG(D_NET, "discover %s, cpt = %d\n", libcfs_nidstr(&lpni->lpni_nid), cpt); rc = lnet_discover_peer_locked(lpni, cpt, false); /* drop ref taken above */ lnet_peer_ni_decref_locked(lpni); if (!rc) lpn->lpn_next_ping = now + alive_router_check_interval; else CERROR("Failed to discover router %s\n", libcfs_nidstr(&rtr->lp_primary_nid)); /* NB cpt lock was dropped in lnet_discover_peer_locked() */ if (version != the_lnet.ln_routers_version) { /* the routers list has changed */ goto rescan; } } if (the_lnet.ln_routing) push = lnet_update_ni_status_locked(); lnet_net_unlock(cpt); /* if the status of the ni changed update the peers */ if (push) lnet_push_update_to_peers(1); } void lnet_destroy_rtrbuf(struct lnet_rtrbuf *rb, int npages) { int sz = offsetof(struct lnet_rtrbuf, rb_kiov[npages]); while (--npages >= 0) __free_page(rb->rb_kiov[npages].bv_page); LIBCFS_FREE(rb, sz); } static struct lnet_rtrbuf * lnet_new_rtrbuf(struct lnet_rtrbufpool *rbp, int cpt) { int npages = rbp->rbp_npages; int sz = offsetof(struct lnet_rtrbuf, rb_kiov[npages]); struct page *page; struct lnet_rtrbuf *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 | __GFP_NORETRY); if (page == NULL) { while (--i >= 0) __free_page(rb->rb_kiov[i].bv_page); LIBCFS_FREE(rb, sz); return NULL; } rb->rb_kiov[i].bv_len = PAGE_SIZE; rb->rb_kiov[i].bv_offset = 0; rb->rb_kiov[i].bv_page = page; } return rb; } static void lnet_rtrpool_free_bufs(struct lnet_rtrbufpool *rbp, int cpt) { int npages = rbp->rbp_npages; struct lnet_rtrbuf *rb; LIST_HEAD(tmp); if (rbp->rbp_nbuffers == 0) /* not initialized or already freed */ return; lnet_net_lock(cpt); list_splice_init(&rbp->rbp_msgs, &tmp); lnet_drop_routed_msgs_locked(&tmp, 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_first_entry(&tmp, struct lnet_rtrbuf, rb_list); list_del(&rb->rb_list); lnet_destroy_rtrbuf(rb, npages); } } static int lnet_rtrpool_adjust_bufs(struct lnet_rtrbufpool *rbp, int nbufs, int cpt) { LIST_HEAD(rb_list); struct lnet_rtrbuf *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); /* 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("lnet: error allocating %ux%u page router buffers on CPT %u: rc = %d\n", nbufs, npages, cpt, -ENOMEM); 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 ((rb = list_first_entry_or_null(&rb_list, struct lnet_rtrbuf, rb_list)) != NULL) { list_del(&rb->rb_list); lnet_destroy_rtrbuf(rb, npages); } return -ENOMEM; } static void lnet_rtrpool_init(struct lnet_rtrbufpool *rbp, int npages) { INIT_LIST_HEAD(&rbp->rbp_msgs); INIT_LIST_HEAD(&rbp->rbp_bufs); rbp->rbp_npages = npages; rbp->rbp_credits = 0; rbp->rbp_mincredits = 0; } void lnet_rtrpools_free(int keep_pools) { struct lnet_rtrbufpool *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; } } static int lnet_nrb_tiny_calculate(void) { int nrbs = LNET_NRB_TINY; 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) { if (tiny_router_buffers < LNET_NRB_TINY_MIN) CWARN("tiny_router_buffers=%d less than recommended minimum %d\n", tiny_router_buffers, LNET_NRB_TINY_MIN); nrbs = tiny_router_buffers; } nrbs /= LNET_CPT_NUMBER; return max(nrbs, 1); } static int lnet_nrb_small_calculate(void) { int nrbs = LNET_NRB_SMALL; 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) { if (small_router_buffers < LNET_NRB_SMALL_MIN) CWARN("small_router_buffers=%d less than recommended minimum %d\n", small_router_buffers, LNET_NRB_SMALL_MIN); nrbs = small_router_buffers; } nrbs /= LNET_CPT_NUMBER; return max(nrbs, 1); } 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) { if (large_router_buffers < LNET_NRB_LARGE_MIN) CWARN("large_router_buffers=%d less than recommended minimum %d\n", large_router_buffers, LNET_NRB_LARGE_MIN); nrbs = large_router_buffers; } nrbs /= LNET_CPT_NUMBER; return max(nrbs, 1); } int lnet_rtrpools_alloc(int im_a_router) { struct lnet_rtrbufpool *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 { rc = -EINVAL; LCONSOLE_ERROR_MSG(0x10b, "lnet: forwarding='%s' not set to either 'enabled' or 'disabled': rc = %d\n", forwarding, rc); return rc; } 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(struct lnet_rtrbufpool)); if (the_lnet.ln_rtrpools == NULL) { rc = -ENOMEM; LCONSOLE_ERROR_MSG(0x10c, "lnet: error allocating router buffer pool: rc = %d\n", rc); return rc; } 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) 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) 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) goto failed; } lnet_net_lock(LNET_LOCK_EX); the_lnet.ln_routing = 1; lnet_net_unlock(LNET_LOCK_EX); complete(&the_lnet.ln_mt_wait_complete); return 0; failed: lnet_rtrpools_free(0); return rc; } static int lnet_rtrpools_adjust_helper(int tiny, int small, int large) { int nrb = 0; int rc = 0; int i; struct lnet_rtrbufpool *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_rtrpools_adjust(int tiny, int small, int large) { /* 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); } 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_target->pb_info.pi_features &= ~LNET_PING_FEAT_RTE_DISABLED; lnet_net_unlock(LNET_LOCK_EX); if (lnet_peer_discovery_disabled) CWARN("Consider turning discovery on to enable full " "Multi-Rail routing functionality\n"); return rc; } 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_target->pb_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); } static inline void lnet_notify_peer_down(struct lnet_ni *ni, struct lnet_nid *nid) { if (ni->ni_net->net_lnd->lnd_notify_peer_down != NULL) (ni->ni_net->net_lnd->lnd_notify_peer_down)(nid); } /* * ni: local NI used to communicate with the peer * nid: peer NID * alive: true if peer is alive, false otherwise * reset: reset health value. This is requested by the LND. * when: notificaiton time. */ int lnet_notify(struct lnet_ni *ni, struct lnet_nid *nid, bool alive, bool reset, time64_t when) { struct lnet_peer_ni *lpni = NULL; struct lnet_route *route; struct lnet_peer *lp; time64_t now = ktime_get_seconds(); int cpt; LASSERT(!in_interrupt()); CDEBUG(D_NET, "%s notifying %s: %s\n", (ni == NULL) ? "userspace" : libcfs_nidstr(&ni->ni_nid), libcfs_nidstr(nid), alive ? "up" : "down"); if (ni != NULL && LNET_NID_NET(&ni->ni_nid) != LNET_NID_NET(nid)) { CWARN("Ignoring notification of %s %s by %s (different net)\n", libcfs_nidstr(nid), alive ? "birth" : "death", libcfs_nidstr(&ni->ni_nid)); return -EINVAL; } /* can't do predictions... */ if (when > now) { CWARN("Ignoring prediction from %s of %s %s %lld seconds in the future\n", ni ? libcfs_nidstr(&ni->ni_nid) : "userspace", libcfs_nidstr(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; } /* must lock 0 since this is used for synchronization */ lnet_net_lock(0); if (the_lnet.ln_state != LNET_STATE_RUNNING) { lnet_net_unlock(0); return -ESHUTDOWN; } lpni = lnet_peer_ni_find_locked(nid); if (lpni == NULL) { /* nid not found */ lnet_net_unlock(0); CDEBUG(D_NET, "%s not found\n", libcfs_nidstr(nid)); return 0; } if (alive) { if (reset) { lpni->lpni_ns_status = LNET_NI_STATUS_UP; lnet_set_lpni_healthv_locked(lpni, LNET_MAX_HEALTH_VALUE); } else { lnet_inc_lpni_healthv_locked(lpni); } } else if (reset) { lpni->lpni_ns_status = LNET_NI_STATUS_DOWN; } /* recalculate aliveness */ alive = lnet_is_peer_ni_alive(lpni); lp = lpni->lpni_peer_net->lpn_peer; /* If this is an LNet router then update route aliveness */ if (lp->lp_rtr_refcount) { if (reset) /* reset flag indicates gateway peer went up or down */ lp->lp_alive = alive; /* If discovery is disabled, locally or on the gateway, then * any routes using lpni as next-hop need to be updated * * NB: We can get many notifications while a route is down, so * we try and avoid the expensive net_lock/EX here for the * common case of receiving duplicate lnet_notify() calls (i.e. * only grab EX lock when we actually need to update the route * aliveness). */ if (lnet_is_discovery_disabled(lp)) { list_for_each_entry(route, &lp->lp_routes, lr_gwlist) { if (nid_same(&route->lr_nid, &lpni->lpni_nid)) lnet_set_route_aliveness(route, alive); } } } lnet_net_unlock(0); if (ni != NULL && !alive) lnet_notify_peer_down(ni, &lpni->lpni_nid); cpt = lpni->lpni_cpt; lnet_net_lock(cpt); lnet_peer_ni_decref_locked(lpni); lnet_net_unlock(cpt); return 0; } EXPORT_SYMBOL(lnet_notify);