/* * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. * * Copyright (c) 2011, 2016, Intel Corporation. * * 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 * License as published by the Free Software Foundation. * * Portals is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Portals; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * */ #define DEBUG_SUBSYSTEM S_LNET #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; } /* 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"); 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 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; 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; } void lnet_notify_locked(struct lnet_peer_ni *lp, int notifylnd, int alive, cfs_time_t when) { if (cfs_time_before(when, lp->lpni_timestamp)) { /* out of date information */ CDEBUG(D_NET, "Out of date\n"); return; } /* * 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; } /* 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 */ spin_unlock(&lp->lpni_lock); CDEBUG(D_NET, "set %s %d\n", libcfs_nid2str(lp->lpni_nid), alive); } /* * 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) { int alive; int 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 */ spin_lock(&lp->lpni_lock); if (lp->lpni_notifying || ni == NULL) { spin_unlock(&lp->lpni_lock); return; } lp->lpni_notifying = 1; /* * 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; lp->lpni_notifylnd = 0; lp->lpni_notify = 0; if (notifylnd && ni->ni_net->net_lnd->lnd_notify != NULL) { spin_unlock(&lp->lpni_lock); lnet_net_unlock(lp->lpni_cpt); /* A new notification could happen now; I'll handle it * when control returns to me */ (ni->ni_net->net_lnd->lnd_notify)(ni, lp->lpni_nid, alive); lnet_net_lock(lp->lpni_cpt); spin_lock(&lp->lpni_lock); } } lp->lpni_notifying = 0; spin_unlock(&lp->lpni_lock); } static void lnet_rtr_addref_locked(struct lnet_peer_ni *lp) { 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(struct lnet_peer_ni *lp) { 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_rnet_locked(__u32 net) { lnet_remotenet_t *rnet; struct list_head *tmp; struct list_head *rn_list; LASSERT(!the_lnet.ln_shutdown); 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; } static void lnet_shuffle_seed(void) { 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; } /* NB expects LNET_LOCK held */ static void lnet_add_route_to_rnet(lnet_remotenet_t *rnet, lnet_route_t *route) { 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_add_route(__u32 net, __u32 hops, lnet_nid_t gateway, unsigned int priority) { 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_ex(gateway, LNET_LOCK_EX); if (IS_ERR(lpni)) { lnet_net_unlock(LNET_LOCK_EX); LIBCFS_FREE(route, sizeof(*route)); LIBCFS_FREE(rnet, sizeof(*rnet)); 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); if (route2->lr_gateway == route->lr_gateway) { add_route = 0; break; } /* our lookups must be true */ LASSERT(route2->lr_gateway->lpni_nid != gateway); } 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); } /* -1 for notify or !add_route */ lnet_peer_ni_decref_locked(route->lr_gateway); lnet_net_unlock(LNET_LOCK_EX); rc = 0; if (!add_route) { rc = -EEXIST; LIBCFS_FREE(route, sizeof(*route)); } if (rnet != rnet2) LIBCFS_FREE(rnet, sizeof(*rnet)); /* indicate to startup the router checker if configured */ wake_up(&the_lnet.ln_rc_waitq); return rc; } 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; } } } lnet_net_unlock(cpt); return 0; } 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; } } 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); return rc; } void lnet_destroy_routes (void) { 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, __u32 *priority) { 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; } void lnet_swap_pinginfo(struct lnet_ping_info *info) { 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; } /** * 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) { 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; } 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 */ } if ((gw->lpni_ping_feats & LNET_PING_FEAT_NI_STATUS) == 0) { spin_unlock(&gw->lpni_lock); return; /* can't carry NI status info */ } 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; } spin_unlock(&gw->lpni_lock); } static void lnet_router_checker_event(lnet_event_t *event) { lnet_rc_data_t *rcd = event->md.user_ptr; struct lnet_peer_ni *lp; LASSERT(rcd != NULL); if (event->unlinked) { LNetInvalidateHandle(&rcd->rcd_mdh); return; } LASSERT(event->type == LNET_EVENT_SEND || event->type == LNET_EVENT_REPLY); lp = rcd->rcd_gateway; LASSERT(lp != NULL); /* 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; } if (event->type == LNET_EVENT_SEND) { lp->lpni_ping_notsent = 0; if (event->status == 0) goto out; } /* 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()); /* 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 (avoid_asym_router_failure && event->status == 0) lnet_parse_rc_info(rcd); out: lnet_net_unlock(lp->lpni_cpt); } static void lnet_wait_known_routerstate(void) { struct lnet_peer_ni *rtr; struct list_head *entry; int all_known; LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING); for (;;) { int cpt = lnet_net_lock_current(); all_known = 1; list_for_each(entry, &the_lnet.ln_routers) { rtr = list_entry(entry, struct lnet_peer_ni, lpni_rtr_list); spin_lock(&rtr->lpni_lock); if (rtr->lpni_alive_count == 0) { all_known = 0; spin_unlock(&rtr->lpni_lock); break; } spin_unlock(&rtr->lpni_lock); } lnet_net_unlock(cpt); if (all_known) return; set_current_state(TASK_UNINTERRUPTIBLE); schedule_timeout(cfs_time_seconds(1)); } } 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; } } } } 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); } } 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; 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) { int secs; secs = rtr->lpni_alive ? live_router_check_interval : dead_router_check_interval; if (secs < 0) secs = 0; return secs; } static void lnet_ping_router_locked (struct lnet_peer_ni *rtr) { 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; } rcd = rtr->lpni_rcd != NULL ? rtr->lpni_rcd : lnet_create_rc_data_locked(rtr); if (rcd == NULL) return; 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)); rtr->lpni_ping_notsent = 1; rtr->lpni_ping_timestamp = now; 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; 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); /* 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_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) { 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); } wait_unlink = wait_unlink && !list_empty(&the_lnet.ln_rcd_zombie); 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); } /* * 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) { 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; return !list_empty(&the_lnet.ln_routers) && (live_router_check_interval > 0 || dead_router_check_interval > 0); } static int lnet_router_checker(void *arg) { struct lnet_peer_ni *rtr; struct list_head *entry; cfs_block_allsigs(); 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)); } lnet_prune_rc_data(1); /* wait for UNLINK */ 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_destroy_rtrbuf(lnet_rtrbuf_t *rb, int npages) { int sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]); while (--npages >= 0) __free_page(rb->rb_kiov[npages].kiov_page); LIBCFS_FREE(rb, sz); } 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; } return rb; } 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); 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_entry(tmp.next, lnet_rtrbuf_t, rb_list); list_del(&rb->rb_list); lnet_destroy_rtrbuf(rb, npages); } } static int lnet_rtrpool_adjust_bufs(lnet_rtrbufpool_t *rbp, int nbufs, int cpt) { 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; } static void lnet_rtrpool_init(lnet_rtrbufpool_t *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) { 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; } } 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) nrbs = tiny_router_buffers; nrbs /= LNET_CPT_NUMBER; return max(nrbs, LNET_NRB_TINY_MIN); } 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) nrbs = small_router_buffers; nrbs /= LNET_CPT_NUMBER; return max(nrbs, LNET_NRB_SMALL_MIN); } 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_rtrpools_alloc(int im_a_router) { 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; } static int lnet_rtrpools_adjust_helper(int tiny, int small, int large) { 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_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_info->pi_features &= ~LNET_PING_FEAT_RTE_DISABLED; lnet_net_unlock(LNET_LOCK_EX); 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_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_notify(lnet_ni_t *ni, lnet_nid_t nid, int alive, cfs_time_t when) { 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; } /* 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);