X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=blobdiff_plain;f=lnet%2Flnet%2Frouter.c;h=ec92e1a4a52f3482d1cc34b8b69e6d8641d257a3;hp=4da95739e29ac2a129123d6b4e58a2609ce9e22c;hb=43b35351e9ca258773e89c2d68047e939fb822fb;hpb=61bcfb2ff55edf6df2a3735b08bbeb479b598833 diff --git a/lnet/lnet/router.c b/lnet/lnet/router.c index 4da9573..ec92e1a 100644 --- a/lnet/lnet/router.c +++ b/lnet/lnet/router.c @@ -1,10 +1,9 @@ /* * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. * - * Copyright (c) 2011, 2013, Intel Corporation. + * Copyright (c) 2011, 2017, Intel Corporation. * - * This file is part of Portals - * http://sourceforge.net/projects/sandiaportals/ + * This file is part of Lustre, https://wiki.whamcloud.com/ * * Portals is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public @@ -22,220 +21,346 @@ */ #define DEBUG_SUBSYSTEM S_LNET -#include -#if defined(__KERNEL__) && defined(LNET_ROUTER) +#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) + +extern unsigned int lnet_current_net_count; static char *forwarding = ""; -CFS_MODULE_PARM(forwarding, "s", charp, 0444, - "Explicitly enable/disable forwarding between networks"); +module_param(forwarding, charp, 0444); +MODULE_PARM_DESC(forwarding, "Explicitly enable/disable forwarding between networks"); static int tiny_router_buffers; -CFS_MODULE_PARM(tiny_router_buffers, "i", int, 0444, - "# of 0 payload messages to buffer in the router"); +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; -CFS_MODULE_PARM(small_router_buffers, "i", int, 0444, - "# of small (1 page) messages to buffer in the router"); +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; -CFS_MODULE_PARM(large_router_buffers, "i", int, 0444, - "# of large messages to buffer in the router"); -static int peer_buffer_credits = 0; -CFS_MODULE_PARM(peer_buffer_credits, "i", int, 0444, - "# router buffer credits per peer"); +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"); int -lnet_peer_buffer_credits(lnet_ni_t *ni) +lnet_peer_buffer_credits(struct lnet_net *net) { - /* NI option overrides LNet default */ - if (ni->ni_peerrtrcredits > 0) - return ni->ni_peerrtrcredits; - if (peer_buffer_credits > 0) - return peer_buffer_credits; - - /* As an approximation, allow this peer the same number of router - * buffers as it is allowed outstanding sends */ - return ni->ni_peertxcredits; + /* 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)"); + +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"); -int -lnet_peer_buffer_credits(lnet_ni_t *ni) +static int +rtr_sensitivity_set(const char *val, cfs_kernel_param_arg_t *kp) { - return 0; -} + 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; + } -#endif + if (value < 0 || value > 100) { + CERROR("Invalid value: %lu for 'router_sensitivity_percentage'\n", value); + return -EINVAL; + } -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"); + /* + * 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); -static int avoid_asym_router_failure = 1; -CFS_MODULE_PARM(avoid_asym_router_failure, "i", int, 0644, - "Avoid asymmetrical router failures (0 to disable)"); + *sen = value; -static int dead_router_check_interval = 60; -CFS_MODULE_PARM(dead_router_check_interval, "i", int, 0644, - "Seconds between dead router health checks (<= 0 to disable)"); + mutex_unlock(&the_lnet.ln_api_mutex); -static int live_router_check_interval = 60; -CFS_MODULE_PARM(live_router_check_interval, "i", int, 0644, - "Seconds between live router health checks (<= 0 to disable)"); + return 0; +} -static int router_ping_timeout = 50; -CFS_MODULE_PARM(router_ping_timeout, "i", int, 0644, - "Seconds to wait for the reply to a router health query"); +void +lnet_rtr_transfer_to_peer(struct lnet_peer *src, struct lnet_peer *target) +{ + struct lnet_route *route; + + lnet_net_lock(LNET_LOCK_EX); + target->lp_rtr_refcount += src->lp_rtr_refcount; + /* move the list of queued messages to the new peer */ + list_splice_init(&src->lp_rtrq, &target->lp_rtrq); + /* move all the routes that reference the peer */ + list_splice_init(&src->lp_routes, &target->lp_routes); + /* update all the routes to point to the new peer */ + list_for_each_entry(route, &target->lp_routes, lr_gwlist) + route->lr_gateway = target; + /* remove the old peer from the ln_routers list */ + list_del_init(&src->lp_rtr_list); + /* add the new peer to the ln_routers list */ + if (list_empty(&target->lp_rtr_list)) { + lnet_peer_addref_locked(target); + list_add_tail(&target->lp_rtr_list, &the_lnet.ln_routers); + } + /* reset the ref count on the old peer and decrement its ref count */ + src->lp_rtr_refcount = 0; + lnet_peer_decref_locked(src); + /* update the router version */ + the_lnet.ln_routers_version++; + lnet_net_unlock(LNET_LOCK_EX); +} 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, cfs_time_t when) +/* + * A net is alive if at least one gateway NI on the network is alive. + */ +static bool +lnet_is_gateway_net_alive(struct lnet_peer_net *lpn) { - if (cfs_time_before(when, lp->lp_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 */ - - 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 */ - - lp->lp_alive_count++; - lp->lp_alive = !(!alive); /* 1 bit! */ - lp->lp_notify = 1; - lp->lp_notifylnd |= notifylnd; - if (lp->lp_alive) - lp->lp_ping_feats = LNET_PING_FEAT_INVAL; /* reset */ - - CDEBUG(D_NET, "set %s %d\n", libcfs_nid2str(lp->lp_nid), alive); -} + struct lnet_peer_ni *lpni; -void -lnet_ni_notify_locked(lnet_ni_t *ni, lnet_peer_t *lp) -{ - int alive; - int notifylnd; + list_for_each_entry(lpni, &lpn->lpn_peer_nis, lpni_peer_nis) { + if (lnet_is_peer_ni_alive(lpni)) + return true; + } - /* 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 */ + return false; +} - if (lp->lp_notifying) - return; +/* + * 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; - lp->lp_notifying = 1; + list_for_each_entry(lpn, &gw->lp_peer_nets, lpn_peer_nets) { + if (!lnet_is_gateway_net_alive(lpn)) + return false; + } - while (lp->lp_notify) { - alive = lp->lp_alive; - notifylnd = lp->lp_notifylnd; + return true; +} - lp->lp_notifylnd = 0; - lp->lp_notify = 0; +/* + * 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; + bool route_alive; + + /* + * check the gateway's interfaces on the route rnet to make sure + * that the gateway is viable. + */ + llpn = lnet_peer_get_net_locked(gw, route->lr_lnet); + if (!llpn) + return false; + + route_alive = lnet_is_gateway_net_alive(llpn); + + if (avoid_asym_router_failure) { + rlpn = lnet_peer_get_net_locked(gw, route->lr_net); + if (!rlpn) + return false; + route_alive = route_alive && + lnet_is_gateway_net_alive(rlpn); + } - if (notifylnd && ni->ni_lnd->lnd_notify != NULL) { - lnet_net_unlock(lp->lp_cpt); + if (!route_alive) + return route_alive; - /* A new notification could happen now; I'll handle it - * when control returns to me */ + spin_lock(&gw->lp_lock); + if (!(gw->lp_state & LNET_PEER_ROUTER_ENABLED)) { + if (gw->lp_rtr_refcount > 0) + CERROR("peer %s is being used as a gateway but routing feature is not turned on\n", + libcfs_nid2str(gw->lp_primary_nid)); + route_alive = false; + } + spin_unlock(&gw->lp_lock); - (ni->ni_lnd->lnd_notify)(ni, lp->lp_nid, alive); + return route_alive; +} - lnet_net_lock(lp->lp_cpt); +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_get_ni_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); } } - lp->lp_notifying = 0; } +void +lnet_router_discovery_complete(struct lnet_peer *lp) +{ + struct lnet_peer_ni *lpni = NULL; + + spin_lock(&lp->lp_lock); + lp->lp_state &= ~LNET_PEER_RTR_DISCOVERY; + spin_unlock(&lp->lp_lock); + + /* + * Router discovery successful? All peer information would've been + * updated already. No need to do any more processing + */ + if (!lp->lp_dc_error) + return; + /* + * discovery failed? then we need to set the status of each lpni + * to DOWN. It will be updated the next time we discover the + * router. For router peer NIs not on local networks, we never send + * messages directly to them, so their health will always remain + * at maximum. We can only tell if they are up or down from the + * status returned in the PING response. If we fail to get that + * status in our scheduled router discovery, then we'll assume + * it's down until we're told otherwise. + */ + CDEBUG(D_NET, "%s: Router discovery failed %d\n", + libcfs_nid2str(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; +} static void -lnet_rtr_addref_locked(lnet_peer_t *lp) +lnet_rtr_addref_locked(struct lnet_peer *lp) { - LASSERT(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 == 1) { - cfs_list_t *pos; - - /* a simple insertion sort */ - cfs_list_for_each_prev(pos, &the_lnet.ln_routers) { - lnet_peer_t *rtr = cfs_list_entry(pos, lnet_peer_t, - lp_rtr_list); - - if (rtr->lp_nid < lp->lp_nid) - break; - } - - cfs_list_add(&lp->lp_rtr_list, pos); - /* addref for the_lnet.ln_routers */ - lnet_peer_addref_locked(lp); - the_lnet.ln_routers_version++; - } + lp->lp_rtr_refcount++; + if (lp->lp_rtr_refcount == 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(lnet_peer_t *lp) +lnet_rtr_decref_locked(struct lnet_peer *lp) { - LASSERT(lp->lp_refcount > 0); + 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(cfs_list_empty(&lp->lp_routes)); - - if (lp->lp_rcd != NULL) { - cfs_list_add(&lp->lp_rcd->rcd_list, - &the_lnet.ln_rcd_deathrow); - lp->lp_rcd = NULL; - } - - cfs_list_del(&lp->lp_rtr_list); - /* decref for the_lnet.ln_routers */ - lnet_peer_decref_locked(lp); - the_lnet.ln_routers_version++; - } + 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++; + } } -lnet_remotenet_t * -lnet_find_net_locked (__u32 net) +struct lnet_remotenet * +lnet_find_rnet_locked(__u32 net) { - lnet_remotenet_t *rnet; - cfs_list_t *tmp; - cfs_list_t *rn_list; + struct lnet_remotenet *rnet; + struct list_head *tmp; + struct list_head *rn_list; - LASSERT(!the_lnet.ln_shutdown); + LASSERT(the_lnet.ln_state == LNET_STATE_RUNNING); rn_list = lnet_net2rnethash(net); - cfs_list_for_each(tmp, rn_list) { - rnet = cfs_list_entry(tmp, lnet_remotenet_t, lrn_list); + list_for_each(tmp, rn_list) { + rnet = list_entry(tmp, struct lnet_remotenet, lrn_list); if (rnet->lrn_net == net) return rnet; @@ -245,243 +370,249 @@ lnet_find_net_locked (__u32 net) static void lnet_shuffle_seed(void) { - static int seeded = 0; - int lnd_type, seed[2]; - struct timeval tv; - lnet_ni_t *ni; - cfs_list_t *tmp; + static int seeded; + struct lnet_ni *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 */ - cfs_list_for_each(tmp, &the_lnet.ln_nis) { - ni = cfs_list_entry(tmp, lnet_ni_t, ni_list); - lnd_type = LNET_NETTYP(LNET_NIDNET(ni->ni_nid)); + if (seeded) + return; - if (lnd_type != LOLND) - seed[0] ^= (LNET_NIDADDR(ni->ni_nid) | lnd_type); - } + /* 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)); - do_gettimeofday(&tv); - cfs_srand(tv.tv_sec ^ seed[0], tv.tv_usec ^ seed[1]); seeded = 1; return; } /* NB expects LNET_LOCK held */ -void -lnet_add_route_to_rnet (lnet_remotenet_t *rnet, lnet_route_t *route) +static void +lnet_add_route_to_rnet(struct lnet_remotenet *rnet, struct lnet_route *route) { - unsigned int len = 0; - unsigned int offset = 0; - cfs_list_t *e; - - lnet_shuffle_seed(); - - cfs_list_for_each (e, &rnet->lrn_routes) { - len++; - } - - /* len+1 positions to add a new entry, also prevents division by 0 */ - offset = cfs_rand() % (len + 1); - cfs_list_for_each (e, &rnet->lrn_routes) { - if (offset == 0) - break; - offset--; - } - cfs_list_add(&route->lr_list, e); - cfs_list_add(&route->lr_gwlist, &route->lr_gateway->lp_routes); + struct lnet_peer_net *lpn; + unsigned int offset = 0; + unsigned int len = 0; + struct list_head *e; + + 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 = cfs_rand() % (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 + */ + list_for_each_entry(lpn, &route->lr_gateway->lp_peer_nets, + lpn_peer_nets) { + lpn->lpn_rtrcheck_timestamp = 0; + } 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, unsigned int hops, lnet_nid_t gateway, - unsigned int priority) +lnet_add_route(__u32 net, __u32 hops, lnet_nid_t gateway, + __u32 priority, __u32 sensitivity) { - cfs_list_t *e; - lnet_remotenet_t *rnet; - lnet_remotenet_t *rnet2; - lnet_route_t *route; - lnet_ni_t *ni; - int add_route; - int rc; - - CDEBUG(D_NET, "Add route: net %s hops %u priority %u gw %s\n", + 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_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; - } - - CFS_INIT_LIST_HEAD(&rnet->lrn_routes); - rnet->lrn_net = net; - route->lr_hops = hops; + 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; + + /* it's a local network */ + if (lnet_islocalnet(net)) + return -EEXIST; + + if (!lnet_islocalnet(LNET_NIDNET(gateway))) { + CERROR("Cannot add route with gateway %s. There is no local interface configured on LNet %s\n", + libcfs_nid2str(gateway), + libcfs_net2str(LNET_NIDNET(gateway))); + return -EINVAL; + } + + /* 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; + /* store the local and remote net that the route represents */ + route->lr_lnet = LNET_NIDNET(gateway); route->lr_net = net; + route->lr_nid = gateway; route->lr_priority = priority; + route->lr_hops = hops; lnet_net_lock(LNET_LOCK_EX); - rc = lnet_nid2peer_locked(&route->lr_gateway, gateway, LNET_LOCK_EX); - if (rc != 0) { + /* + * lnet_nid2peerni_ex() grabs a ref on the lpni. We will need to + * lose that once we're done + */ + 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)); - if (rc == -EHOSTUNREACH) { /* gateway is not on a local net */ - return 0; /* ignore the route entry */ - } else { - CERROR("Error %d creating route %s %d %s\n", rc, - libcfs_net2str(net), hops, - libcfs_nid2str(gateway)); - } - return rc; - } - - LASSERT (!the_lnet.ln_shutdown); - - rnet2 = lnet_find_net_locked(net); - if (rnet2 == NULL) { - /* new network */ - cfs_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; - cfs_list_for_each (e, &rnet2->lrn_routes) { - lnet_route_t *route2 = cfs_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->lp_nid != gateway); - } - - if (add_route) { - lnet_peer_addref_locked(route->lr_gateway); /* +1 for notify */ - lnet_add_route_to_rnet(rnet2, route); + rc = PTR_ERR(lpni); + CERROR("Error %d creating route %s %d %s\n", rc, + libcfs_net2str(net), hops, + libcfs_nid2str(gateway)); + return rc; + } - ni = route->lr_gateway->lp_ni; - lnet_net_unlock(LNET_LOCK_EX); + LASSERT(lpni->lpni_peer_net && lpni->lpni_peer_net->lpn_peer); + gw = lpni->lpni_peer_net->lpn_peer; - /* XXX Assume alive */ - if (ni->ni_lnd->lnd_notify != NULL) - (ni->ni_lnd->lnd_notify)(ni, gateway, 1); + route->lr_gateway = gw; - lnet_net_lock(LNET_LOCK_EX); + rnet2 = lnet_find_rnet_locked(net); + if (rnet2 == NULL) { + /* new network */ + list_add_tail(&rnet->lrn_list, lnet_net2rnethash(net)); + rnet2 = rnet; } - /* -1 for notify or !add_route */ - lnet_peer_decref_locked(route->lr_gateway); - lnet_net_unlock(LNET_LOCK_EX); - - if (!add_route) - LIBCFS_FREE(route, sizeof(*route)); + /* 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; - if (rnet != rnet2) - LIBCFS_FREE(rnet, sizeof(*rnet)); - - return 0; -} + route2 = list_entry(route_entry, struct lnet_route, lr_list); + if (route2->lr_gateway == route->lr_gateway) { + add_route = 0; + break; + } -int -lnet_check_routes(void) -{ - lnet_remotenet_t *rnet; - lnet_route_t *route; - lnet_route_t *route2; - cfs_list_t *e1; - cfs_list_t *e2; - int cpt; - cfs_list_t *rn_list; - int i; + /* our lookups must be true */ + LASSERT(route2->lr_gateway->lp_primary_nid != gateway); + } - cpt = lnet_net_lock_current(); + /* + * 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); + } - for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) { - rn_list = &the_lnet.ln_remote_nets_hash[i]; - cfs_list_for_each(e1, rn_list) { - rnet = cfs_list_entry(e1, lnet_remotenet_t, lrn_list); + /* + * get rid of the reference on the lpni. + */ + lnet_peer_ni_decref_locked(lpni); + lnet_net_unlock(LNET_LOCK_EX); - route2 = NULL; - cfs_list_for_each(e2, &rnet->lrn_routes) { - lnet_nid_t nid1; - lnet_nid_t nid2; - int net; + rc = 0; - route = cfs_list_entry(e2, lnet_route_t, - lr_list); + if (!add_route) { + rc = -EEXIST; + LIBCFS_FREE(route, sizeof(*route)); + } - if (route2 == NULL) { - route2 = route; - continue; - } + if (rnet != rnet2) + LIBCFS_FREE(rnet, sizeof(*rnet)); - if (route->lr_gateway->lp_ni == - route2->lr_gateway->lp_ni) - continue; + /* kick start the monitor thread to handle the added route */ + wake_up(&the_lnet.ln_mt_waitq); - nid1 = route->lr_gateway->lp_nid; - nid2 = route2->lr_gateway->lp_nid; - net = rnet->lrn_net; + return rc; +} - lnet_net_unlock(cpt); +static void +lnet_del_route_from_rnet(lnet_nid_t 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 != LNET_NID_ANY && + gw_nid != gateway->lp_primary_nid) + continue; - CERROR("Routes to %s via %s and %s not " - "supported\n", - libcfs_net2str(net), - libcfs_nid2str(nid1), - libcfs_nid2str(nid2)); - return -EINVAL; - } - } + /* + * 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); } - - lnet_net_unlock(cpt); - return 0; } int lnet_del_route(__u32 net, lnet_nid_t gw_nid) { - struct lnet_peer *gateway; - lnet_remotenet_t *rnet; - lnet_route_t *route; - cfs_list_t *e1; - cfs_list_t *e2; - int rc = -ENOENT; - cfs_list_t *rn_list; - int idx = 0; + struct 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 list_head zombies; + struct lnet_peer *lp; + int i = 0; + + INIT_LIST_HEAD(&rnet_zombies); + INIT_LIST_HEAD(&zombies); CDEBUG(D_NET, "Del route: net %s : gw %s\n", libcfs_net2str(net), libcfs_nid2str(gw_nid)); @@ -490,97 +621,139 @@ lnet_del_route(__u32 net, lnet_nid_t gw_nid) * 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: - cfs_list_for_each(e1, rn_list) { - rnet = cfs_list_entry(e1, lnet_remotenet_t, lrn_list); + lpni = lnet_find_peer_ni_locked(gw_nid); + if (lpni) { + lp = lpni->lpni_peer_net->lpn_peer; + LASSERT(lp); + gw_nid = lp->lp_primary_nid; + lnet_peer_ni_decref_locked(lpni); + } - if (!(net == LNET_NIDNET(LNET_NID_ANY) || - net == rnet->lrn_net)) - continue; + if (net != LNET_NIDNET(LNET_NID_ANY)) { + rnet = lnet_find_rnet_locked(net); + if (!rnet) { + lnet_net_unlock(LNET_LOCK_EX); + return -ENOENT; + } + lnet_del_route_from_rnet(gw_nid, &rnet->lrn_routes, + &zombies); + if (list_empty(&rnet->lrn_routes)) + list_move(&rnet->lrn_list, &rnet_zombies); + goto delete_zombies; + } - cfs_list_for_each(e2, &rnet->lrn_routes) { - route = cfs_list_entry(e2, lnet_route_t, lr_list); + for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) { + rn_list = &the_lnet.ln_remote_nets_hash[i]; - gateway = route->lr_gateway; - if (!(gw_nid == LNET_NID_ANY || - gw_nid == gateway->lp_nid)) - continue; + list_for_each_entry_safe(rnet, tmp, rn_list, lrn_list) { + lnet_del_route_from_rnet(gw_nid, &rnet->lrn_routes, + &zombies); + if (list_empty(&rnet->lrn_routes)) + list_move(&rnet->lrn_list, &rnet_zombies); + } + } - cfs_list_del(&route->lr_list); - cfs_list_del(&route->lr_gwlist); - the_lnet.ln_remote_nets_version++; +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; + } - if (cfs_list_empty(&rnet->lrn_routes)) - cfs_list_del(&rnet->lrn_list); - else - rnet = NULL; + lnet_net_unlock(LNET_LOCK_EX); - lnet_rtr_decref_locked(gateway); - lnet_peer_decref_locked(gateway); + while (!list_empty(&zombies)) { + route = list_first_entry(&zombies, struct lnet_route, lr_list); + list_del(&route->lr_list); + LIBCFS_FREE(route, sizeof(*route)); + } - lnet_net_unlock(LNET_LOCK_EX); + 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)); + } - LIBCFS_FREE(route, sizeof(*route)); + return 0; +} + +void +lnet_destroy_routes (void) +{ + lnet_del_route(LNET_NIDNET(LNET_NID_ANY), LNET_NID_ANY); +} - if (rnet != NULL) - LIBCFS_FREE(rnet, sizeof(*rnet)); +int lnet_get_rtr_pool_cfg(int cpt, struct lnet_ioctl_pool_cfg *pool_cfg) +{ + struct lnet_rtrbufpool *rbp; + int i, rc = -ENOENT, j; - rc = 0; - lnet_net_lock(LNET_LOCK_EX); - goto again; + 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; } - 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_lock(LNET_LOCK_EX); + pool_cfg->pl_routing = the_lnet.ln_routing; 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_route(int idx, __u32 *net, __u32 *hops, - lnet_nid_t *gateway, __u32 *alive, __u32 *priority) + lnet_nid_t *gateway, __u32 *alive, __u32 *priority, __u32 *sensitivity) { - cfs_list_t *e1; - cfs_list_t *e2; - lnet_remotenet_t *rnet; - lnet_route_t *route; - int cpt; - int i; - cfs_list_t *rn_list; + struct lnet_remotenet *rnet; + struct list_head *rn_list; + struct lnet_route *route; + struct list_head *e1; + struct list_head *e2; + 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]; - cfs_list_for_each(e1, rn_list) { - rnet = cfs_list_entry(e1, lnet_remotenet_t, lrn_list); + list_for_each(e1, rn_list) { + rnet = list_entry(e1, struct lnet_remotenet, lrn_list); - cfs_list_for_each(e2, &rnet->lrn_routes) { - route = cfs_list_entry(e2, lnet_route_t, - lr_list); + list_for_each(e2, &rnet->lrn_routes) { + route = list_entry(e2, struct lnet_route, + lr_list); if (idx-- == 0) { *net = rnet->lrn_net; + *gateway = route->lr_nid; *hops = route->lr_hops; *priority = route->lr_priority; - *gateway = route->lr_gateway->lp_nid; - *alive = route->lr_gateway->lp_alive; + *sensitivity = route->lr_gateway-> + lp_health_sensitivity; + *alive = lnet_is_route_alive(route); lnet_net_unlock(cpt); return 0; } @@ -592,718 +765,262 @@ lnet_get_route(int idx, __u32 *net, __u32 *hops, return -ENOENT; } -void -lnet_swap_pinginfo(lnet_ping_info_t *info) -{ - int i; - lnet_ni_status_t *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) +lnet_wait_known_routerstate(void) { - lnet_ping_info_t *info = rcd->rcd_pinginfo; - struct lnet_peer *gw = rcd->rcd_gateway; - lnet_route_t *rtr; - - if (!gw->lp_alive) - return; - - 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->lp_nid), info->pi_magic); - gw->lp_ping_feats = LNET_PING_FEAT_INVAL; - return; - } - - gw->lp_ping_feats = info->pi_features; - if ((gw->lp_ping_feats & LNET_PING_FEAT_MASK) == 0) { - CDEBUG(D_NET, "%s: Unexpected features 0x%x\n", - libcfs_nid2str(gw->lp_nid), gw->lp_ping_feats); - return; /* nothing I can understand */ - } - - if ((gw->lp_ping_feats & LNET_PING_FEAT_NI_STATUS) == 0) - return; /* can't carry NI status info */ + struct lnet_peer *rtr; + struct list_head *entry; + int all_known; - cfs_list_for_each_entry(rtr, &gw->lp_routes, lr_gwlist) { - int down = 0; - int up = 0; - int i; + LASSERT(the_lnet.ln_mt_state == LNET_MT_STATE_RUNNING); - for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) { - lnet_ni_status_t *stat = &info->pi_ni[i]; - lnet_nid_t nid = stat->ns_nid; + for (;;) { + int cpt = lnet_net_lock_current(); - if (nid == LNET_NID_ANY) { - CDEBUG(D_NET, "%s: unexpected LNET_NID_ANY\n", - libcfs_nid2str(gw->lp_nid)); - gw->lp_ping_feats = LNET_PING_FEAT_INVAL; - return; - } + all_known = 1; + list_for_each(entry, &the_lnet.ln_routers) { + rtr = list_entry(entry, struct lnet_peer, + lp_rtr_list); - if (LNET_NETTYP(LNET_NIDNET(nid)) == LOLND) - continue; + spin_lock(&rtr->lp_lock); - if (stat->ns_status == LNET_NI_STATUS_DOWN) { - down++; - continue; + if ((rtr->lp_state & LNET_PEER_DISCOVERED) == 0) { + all_known = 0; + spin_unlock(&rtr->lp_lock); + break; } + spin_unlock(&rtr->lp_lock); + } - if (stat->ns_status == LNET_NI_STATUS_UP) { - if (LNET_NIDNET(nid) == rtr->lr_net) { - up = 1; - break; - } - continue; - } + lnet_net_unlock(cpt); - CDEBUG(D_NET, "%s: Unexpected status 0x%x\n", - libcfs_nid2str(gw->lp_nid), stat->ns_status); - gw->lp_ping_feats = LNET_PING_FEAT_INVAL; + if (all_known) return; - } - if (up) { /* ignore downed NIs if NI for dest network is up */ - rtr->lr_downis = 0; - continue; - } - rtr->lr_downis = down; + set_current_state(TASK_UNINTERRUPTIBLE); + schedule_timeout(cfs_time_seconds(1)); } } -static void -lnet_router_checker_event(lnet_event_t *event) +static inline bool +lnet_net_set_status_locked(struct lnet_net *net, __u32 status) { - lnet_rc_data_t *rcd = event->md.user_ptr; - struct lnet_peer *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); + struct lnet_ni *ni; + bool update = false; - /* 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->lp_cpt); - if (!lnet_isrouter(lp) || lp->lp_rcd != rcd) { - /* ignore if no longer a router or rcd is replaced */ - goto out; - } - - if (event->type == LNET_EVENT_SEND) { - lp->lp_ping_notsent = 0; - if (event->status == 0) - goto out; + list_for_each_entry(ni, &net->net_ni_list, ni_netlist) { + lnet_ni_lock(ni); + if (ni->ni_status && + ni->ni_status->ns_status != status) { + ni->ni_status->ns_status = status; + update = true; + } + lnet_ni_unlock(ni); } - /* 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->lp_cpt); -} - -void -lnet_wait_known_routerstate(void) -{ - lnet_peer_t *rtr; - cfs_list_t *entry; - int all_known; - - LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING); - - for (;;) { - int cpt = lnet_net_lock_current(); - - all_known = 1; - cfs_list_for_each (entry, &the_lnet.ln_routers) { - rtr = cfs_list_entry(entry, lnet_peer_t, lp_rtr_list); - - if (rtr->lp_alive_count == 0) { - all_known = 0; - break; - } - } - - lnet_net_unlock(cpt); - - if (all_known) - return; - -#ifndef __KERNEL__ - lnet_router_checker(); -#endif - cfs_pause(cfs_time_seconds(1)); - } + return update; } -void +static bool lnet_update_ni_status_locked(void) { - lnet_ni_t *ni; - long now; - int timeout; + struct lnet_net *net; + bool push = false; + time64_t now; + time64_t timeout; LASSERT(the_lnet.ln_routing); - timeout = router_ping_timeout + - MAX(live_router_check_interval, dead_router_check_interval); + timeout = router_ping_timeout + alive_router_check_interval; - now = cfs_time_current_sec(); - cfs_list_for_each_entry(ni, &the_lnet.ln_nis, ni_list) { - if (ni->ni_lnd->lnd_type == LOLND) + now = ktime_get_real_seconds(); + list_for_each_entry(net, &the_lnet.ln_nets, net_list) { + if (net->net_lnd->lnd_type == LOLND) continue; - if (now < ni->ni_last_alive + timeout) + if (now < net->net_last_alive + timeout) continue; - lnet_ni_lock(ni); + spin_lock(&net->net_lock); /* re-check with lock */ - if (now < ni->ni_last_alive + timeout) { - lnet_ni_unlock(ni); + if (now < net->net_last_alive + timeout) { + spin_unlock(&net->net_lock); 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); + 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. + */ + push = lnet_net_set_status_locked(net, LNET_NI_STATUS_DOWN); } -} - -void -lnet_destroy_rc_data(lnet_rc_data_t *rcd) -{ - LASSERT(cfs_list_empty(&rcd->rcd_list)); - /* detached from network */ - LASSERT(LNetHandleIsInvalid(rcd->rcd_mdh)); - if (rcd->rcd_gateway != NULL) { - int cpt = rcd->rcd_gateway->lp_cpt; - - lnet_net_lock(cpt); - lnet_peer_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)); + return push; } -lnet_rc_data_t * -lnet_create_rc_data_locked(lnet_peer_t *gateway) +void lnet_wait_router_start(void) { - lnet_rc_data_t *rcd = NULL; - lnet_ping_info_t *pi; - int rc; - int i; - - lnet_net_unlock(gateway->lp_cpt); - - LIBCFS_ALLOC(rcd, sizeof(*rcd)); - if (rcd == NULL) - goto out; - - LNetInvalidateHandle(&rcd->rcd_mdh); - CFS_INIT_LIST_HEAD(&rcd->rcd_list); - - LIBCFS_ALLOC(pi, LNET_PINGINFO_SIZE); - if (pi == NULL) - goto out; - - memset(pi, 0, LNET_PINGINFO_SIZE); - for (i = 0; i < LNET_MAX_RTR_NIS; i++) { - pi->pi_ni[i].ns_nid = LNET_NID_ANY; - pi->pi_ni[i].ns_status = LNET_NI_STATUS_INVALID; - } - rcd->rcd_pinginfo = pi; - - 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->lp_cpt); - /* router table changed or someone has created rcd for this gateway */ - if (!lnet_isrouter(gateway) || gateway->lp_rcd != NULL) { - lnet_net_unlock(gateway->lp_cpt); - goto out; - } - - lnet_peer_addref_locked(gateway); - rcd->rcd_gateway = gateway; - gateway->lp_rcd = rcd; - gateway->lp_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); + 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(); } - - lnet_net_lock(gateway->lp_cpt); - return gateway->lp_rcd; } -static int -lnet_router_check_interval (lnet_peer_t *rtr) -{ - int secs; - - secs = rtr->lp_alive ? live_router_check_interval : - dead_router_check_interval; - if (secs < 0) - secs = 0; - - return secs; -} - -static void -lnet_ping_router_locked (lnet_peer_t *rtr) -{ - lnet_rc_data_t *rcd = NULL; - cfs_time_t now = cfs_time_current(); - int secs; - - lnet_peer_addref_locked(rtr); - - if (rtr->lp_ping_deadline != 0 && /* ping timed out? */ - cfs_time_after(now, rtr->lp_ping_deadline)) - lnet_notify_locked(rtr, 1, 0, now); - - /* Run any outstanding notifications */ - lnet_ni_notify_locked(rtr->lp_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_decref_locked(rtr); - return; - } - - rcd = rtr->lp_rcd != NULL ? - rtr->lp_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 lp_ping_timestamp %lu\n", - libcfs_nid2str(rtr->lp_nid), secs, - rtr->lp_ping_deadline, rtr->lp_ping_notsent, - rtr->lp_alive, rtr->lp_alive_count, rtr->lp_ping_timestamp); - - if (secs != 0 && !rtr->lp_ping_notsent && - cfs_time_after(now, cfs_time_add(rtr->lp_ping_timestamp, - cfs_time_seconds(secs)))) { - int rc; - lnet_process_id_t id; - lnet_handle_md_t mdh; - - id.nid = rtr->lp_nid; - id.pid = LUSTRE_SRV_LNET_PID; - CDEBUG(D_NET, "Check: %s\n", libcfs_id2str(id)); - - rtr->lp_ping_notsent = 1; - rtr->lp_ping_timestamp = now; - - mdh = rcd->rcd_mdh; - - if (rtr->lp_ping_deadline == 0) { - rtr->lp_ping_deadline = - cfs_time_shift(router_ping_timeout); - } - - lnet_net_unlock(rtr->lp_cpt); - - rc = LNetGet(LNET_NID_ANY, mdh, id, LNET_RESERVED_PORTAL, - LNET_PROTO_PING_MATCHBITS, 0); - - lnet_net_lock(rtr->lp_cpt); - if (rc != 0) - rtr->lp_ping_notsent = 0; /* no event pending */ - } - - lnet_peer_decref_locked(rtr); - return; -} - -int -lnet_router_checker_start(void) +/* + * This function is called from the monitor thread to check if there are + * any active routers that need to be checked. + */ +inline bool +lnet_router_checker_active(void) { - int rc; - int eqsz; -#ifndef __KERNEL__ - lnet_peer_t *rtr; - __u64 version; - int nrtr = 0; - int router_checker_max_eqsize = 10240; - - LASSERT (check_routers_before_use); - LASSERT (dead_router_check_interval > 0); - - lnet_net_lock(0); - - /* As an approximation, allow each router the same number of - * outstanding events as it is allowed outstanding sends */ - eqsz = 0; - version = the_lnet.ln_routers_version; - cfs_list_for_each_entry(rtr, &the_lnet.ln_routers, lp_rtr_list) { - lnet_ni_t *ni = rtr->lp_ni; - lnet_process_id_t id; - - nrtr++; - eqsz += ni->ni_peertxcredits; - - /* one async ping reply per router */ - id.nid = rtr->lp_nid; - id.pid = LUSTRE_SRV_LNET_PID; - - lnet_net_unlock(0); - - rc = LNetSetAsync(id, 1); - if (rc != 0) { - CWARN("LNetSetAsync %s failed: %d\n", - libcfs_id2str(id), rc); - return rc; - } - - lnet_net_lock(0); - /* NB router list doesn't change in userspace */ - LASSERT(version == the_lnet.ln_routers_version); - } - - lnet_net_unlock(0); - - if (nrtr == 0) { - CDEBUG(D_NET, - "No router found, not starting router checker\n"); - return 0; - } - - /* at least allow a SENT and a REPLY per router */ - if (router_checker_max_eqsize < 2 * nrtr) - router_checker_max_eqsize = 2 * nrtr; - - LASSERT (eqsz > 0); - if (eqsz > router_checker_max_eqsize) - eqsz = router_checker_max_eqsize; -#endif - - LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN); - - 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; - } - - if (!the_lnet.ln_routing && - live_router_check_interval <= 0 && - dead_router_check_interval <= 0) - return 0; - -#ifdef __KERNEL__ - sema_init(&the_lnet.ln_rc_signal, 0); - /* EQ size doesn't matter; the callback is guaranteed to get every - * event */ - eqsz = 0; - rc = LNetEQAlloc(eqsz, lnet_router_checker_event, - &the_lnet.ln_rc_eqh); -#else - rc = LNetEQAlloc(eqsz, LNET_EQ_HANDLER_NONE, - &the_lnet.ln_rc_eqh); -#endif - if (rc != 0) { - CERROR("Can't allocate EQ(%d): %d\n", eqsz, rc); - return -ENOMEM; - } - - the_lnet.ln_rc_state = LNET_RC_STATE_RUNNING; -#ifdef __KERNEL__ - rc = PTR_ERR(kthread_run(lnet_router_checker, - NULL, "router_checker")); - if (IS_ERR_VALUE(rc)) { - 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; - } -#endif - - 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(); - } + /* 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 0; + return !list_empty(&the_lnet.ln_routers) && + alive_router_check_interval > 0; } void -lnet_router_checker_stop (void) +lnet_check_routers(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; - -#ifdef __KERNEL__ - /* block until event callback signals exit */ - down(&the_lnet.ln_rc_signal); -#else - lnet_router_checker(); -#endif - 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; - lnet_peer_t *lp; - cfs_list_t head; - int i = 2; - - if (likely(the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING && - cfs_list_empty(&the_lnet.ln_rcd_deathrow) && - cfs_list_empty(&the_lnet.ln_rcd_zombie))) - return; - - CFS_INIT_LIST_HEAD(&head); - - lnet_net_lock(LNET_LOCK_EX); + struct lnet_peer_net *first_lpn = NULL; + struct lnet_peer_net *lpn; + struct lnet_peer_ni *lpni; + struct list_head *entry; + struct lnet_peer *rtr; + bool push = false; + bool found_lpn; + __u64 version; + __u32 net_id; + time64_t now; + int cpt; + int rc; - if (the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING) { - /* router checker is stopping, prune all */ - cfs_list_for_each_entry(lp, &the_lnet.ln_routers, - lp_rtr_list) { - if (lp->lp_rcd == NULL) - continue; - - LASSERT(cfs_list_empty(&lp->lp_rcd->rcd_list)); - cfs_list_add(&lp->lp_rcd->rcd_list, - &the_lnet.ln_rcd_deathrow); - lp->lp_rcd = NULL; + 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, + lp_rtr_list); + + now = ktime_get_real_seconds(); + + /* + * only discover the router if we've passed + * alive_router_check_interval seconds. Some of the router + * interfaces could be down and in that case they would be + * undergoing recovery separately from this discovery. + */ + /* find next peer net which is also local */ + 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_nid2str(rtr->lp_primary_nid)); + break; + } + if (first_lpn == lpn) + break; + if (!first_lpn) + first_lpn = lpn; + found_lpn = lnet_islocalnet_locked(lpn->lpn_net_id); + net_id = lpn->lpn_net_id; + } while (!found_lpn); + + if (!found_lpn || !lpn) { + CERROR("no local network found for gateway %s\n", + libcfs_nid2str(rtr->lp_primary_nid)); + continue; } - } - /* unlink all RCDs on deathrow list */ - cfs_list_splice_init(&the_lnet.ln_rcd_deathrow, &head); - - if (!cfs_list_empty(&head)) { - lnet_net_unlock(LNET_LOCK_EX); - - cfs_list_for_each_entry(rcd, &head, rcd_list) - LNetMDUnlink(rcd->rcd_mdh); - - lnet_net_lock(LNET_LOCK_EX); - } - - cfs_list_splice_init(&head, &the_lnet.ln_rcd_zombie); - - /* release all zombie RCDs */ - while (!cfs_list_empty(&the_lnet.ln_rcd_zombie)) { - cfs_list_for_each_entry_safe(rcd, tmp, &the_lnet.ln_rcd_zombie, - rcd_list) { - if (LNetHandleIsInvalid(rcd->rcd_mdh)) - cfs_list_move(&rcd->rcd_list, &head); + if (now - lpn->lpn_rtrcheck_timestamp < + alive_router_check_interval / lnet_current_net_count) + continue; + + /* + * If we're currently discovering the peer then don't + * issue another discovery + */ + spin_lock(&rtr->lp_lock); + if (rtr->lp_state & LNET_PEER_RTR_DISCOVERY) { + spin_unlock(&rtr->lp_lock); + continue; } - - wait_unlink = wait_unlink && - !cfs_list_empty(&the_lnet.ln_rcd_zombie); - - lnet_net_unlock(LNET_LOCK_EX); - - while (!cfs_list_empty(&head)) { - rcd = cfs_list_entry(head.next, - lnet_rc_data_t, rcd_list); - cfs_list_del_init(&rcd->rcd_list); - lnet_destroy_rc_data(rcd); + /* make sure we actively discover the router */ + rtr->lp_state &= ~LNET_PEER_NIDS_UPTODATE; + rtr->lp_state |= LNET_PEER_RTR_DISCOVERY; + spin_unlock(&rtr->lp_lock); + + /* find the peer_ni associated with the primary NID */ + lpni = lnet_peer_get_ni_locked(rtr, rtr->lp_primary_nid); + if (!lpni) { + CDEBUG(D_NET, "Expected to find an lpni for %s, but non found\n", + libcfs_nid2str(rtr->lp_primary_nid)); + continue; } + lnet_peer_ni_addref_locked(lpni); - if (!wait_unlink) - return; - - i++; - CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET, - "Waiting for rc buffers to unlink\n"); - cfs_pause(cfs_time_seconds(1) / 4); - - lnet_net_lock(LNET_LOCK_EX); - } - - lnet_net_unlock(LNET_LOCK_EX); -} - - -#if defined(__KERNEL__) && defined(LNET_ROUTER) - -static int -lnet_router_checker(void *arg) -{ - lnet_peer_t *rtr; - cfs_list_t *entry; - - cfs_block_allsigs(); - - LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING); - - while (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING) { - __u64 version; - int cpt; - int cpt2; + /* specify the net to use */ + rtr->lp_disc_net_id = lpn->lpn_net_id; - cpt = lnet_net_lock_current(); -rescan: - version = the_lnet.ln_routers_version; - - cfs_list_for_each(entry, &the_lnet.ln_routers) { - rtr = cfs_list_entry(entry, lnet_peer_t, lp_rtr_list); - - cpt2 = lnet_cpt_of_nid_locked(rtr->lp_nid); - 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; - } + /* discover the router */ + CDEBUG(D_NET, "discover %s, cpt = %d\n", + libcfs_nid2str(lpni->lpni_nid), cpt); + rc = lnet_discover_peer_locked(lpni, cpt, false); - lnet_ping_router_locked(rtr); + /* decrement ref count acquired by find_peer_ni_locked() */ + lnet_peer_ni_decref_locked(lpni); - /* NB dropped lock */ - if (version != the_lnet.ln_routers_version) { - /* the routers list has changed */ - goto rescan; - } - } + if (!rc) + lpn->lpn_rtrcheck_timestamp = now; + else + CERROR("Failed to discover router %s\n", + libcfs_nid2str(rtr->lp_primary_nid)); - 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 cfs_pause() here always adds 1 to load average - * because kernel counts # active tasks as nr_running - * + nr_uninterruptible. */ - schedule_timeout_and_set_state(TASK_INTERRUPTIBLE, - cfs_time_seconds(1)); + /* NB dropped lock */ + if (version != the_lnet.ln_routers_version) { + /* the routers list has changed */ + goto rescan; + } } - LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING); + if (the_lnet.ln_routing) + push = lnet_update_ni_status_locked(); - lnet_prune_rc_data(1); /* wait for UNLINK */ + lnet_net_unlock(cpt); - 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; + /* if the status of the ni changed update the peers */ + if (push) + lnet_push_update_to_peers(1); } void -lnet_destroy_rtrbuf(lnet_rtrbuf_t *rb, int npages) +lnet_destroy_rtrbuf(struct lnet_rtrbuf *rb, int npages) { - int sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]); + int sz = offsetof(struct lnet_rtrbuf, rb_kiov[npages]); - while (--npages >= 0) + while (--npages >= 0) __free_page(rb->rb_kiov[npages].kiov_page); - LIBCFS_FREE(rb, sz); + LIBCFS_FREE(rb, sz); } -lnet_rtrbuf_t * -lnet_new_rtrbuf(lnet_rtrbufpool_t *rbp, int cpt) +static struct lnet_rtrbuf * +lnet_new_rtrbuf(struct lnet_rtrbufpool *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; + 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) @@ -1313,118 +1030,165 @@ lnet_new_rtrbuf(lnet_rtrbufpool_t *rbp, int cpt) for (i = 0; i < npages; i++) { page = cfs_page_cpt_alloc(lnet_cpt_table(), cpt, - __GFP_ZERO | GFP_IOFS); - if (page == NULL) { - while (--i >= 0) + GFP_KERNEL | __GFP_ZERO); + if (page == NULL) { + while (--i >= 0) __free_page(rb->rb_kiov[i].kiov_page); - LIBCFS_FREE(rb, sz); - return NULL; - } + LIBCFS_FREE(rb, sz); + return NULL; + } - rb->rb_kiov[i].kiov_len = PAGE_CACHE_SIZE; - rb->rb_kiov[i].kiov_offset = 0; - rb->rb_kiov[i].kiov_page = page; - } + rb->rb_kiov[i].kiov_len = PAGE_SIZE; + rb->rb_kiov[i].kiov_offset = 0; + rb->rb_kiov[i].kiov_page = page; + } - return rb; + return rb; } -void -lnet_rtrpool_free_bufs(lnet_rtrbufpool_t *rbp) +static void +lnet_rtrpool_free_bufs(struct lnet_rtrbufpool *rbp, int cpt) { - int npages = rbp->rbp_npages; - int nbuffers = 0; - lnet_rtrbuf_t *rb; + int npages = rbp->rbp_npages; + struct lnet_rtrbuf *rb; + struct list_head tmp; if (rbp->rbp_nbuffers == 0) /* not initialized or already freed */ return; - LASSERT (cfs_list_empty(&rbp->rbp_msgs)); - LASSERT (rbp->rbp_credits == rbp->rbp_nbuffers); - - while (!cfs_list_empty(&rbp->rbp_bufs)) { - LASSERT (rbp->rbp_credits > 0); + INIT_LIST_HEAD(&tmp); - rb = cfs_list_entry(rbp->rbp_bufs.next, - lnet_rtrbuf_t, rb_list); - cfs_list_del(&rb->rb_list); - lnet_destroy_rtrbuf(rb, npages); - nbuffers++; - } - - LASSERT (rbp->rbp_nbuffers == nbuffers); - LASSERT (rbp->rbp_credits == nbuffers); + 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); - rbp->rbp_nbuffers = rbp->rbp_credits = 0; + /* Free buffers on the free list. */ + while (!list_empty(&tmp)) { + rb = list_entry(tmp.next, struct lnet_rtrbuf, rb_list); + list_del(&rb->rb_list); + lnet_destroy_rtrbuf(rb, npages); + } } -int -lnet_rtrpool_alloc_bufs(lnet_rtrbufpool_t *rbp, int nbufs, int cpt) +static int +lnet_rtrpool_adjust_bufs(struct lnet_rtrbufpool *rbp, int nbufs, int cpt) { - lnet_rtrbuf_t *rb; - int i; + struct list_head rb_list; + struct lnet_rtrbuf *rb; + int num_rb; + int num_buffers = 0; + int old_req_nbufs; + int npages = rbp->rbp_npages; - if (rbp->rbp_nbuffers != 0) { - LASSERT (rbp->rbp_nbuffers == nbufs); - return 0; - } + 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); - for (i = 0; i < nbufs; i++) { + 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; + } - if (rb == NULL) { - CERROR("Failed to allocate %d router bufs of %d pages\n", - nbufs, rbp->rbp_npages); - return -ENOMEM; - } + list_add(&rb->rb_list, &rb_list); + num_buffers++; + } - rbp->rbp_nbuffers++; - rbp->rbp_credits++; - rbp->rbp_mincredits++; - cfs_list_add(&rb->rb_list, &rbp->rbp_bufs); + lnet_net_lock(cpt); - /* No allocation "under fire" */ - /* Otherwise we'd need code to schedule blocked msgs etc */ - LASSERT (!the_lnet.ln_routing); - } + 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); - LASSERT (rbp->rbp_credits == nbufs); - return 0; + lnet_net_unlock(cpt); + + return 0; + +failed: + while (!list_empty(&rb_list)) { + rb = list_entry(rb_list.next, struct lnet_rtrbuf, rb_list); + list_del(&rb->rb_list); + lnet_destroy_rtrbuf(rb, npages); + } + + return -ENOMEM; } -void -lnet_rtrpool_init(lnet_rtrbufpool_t *rbp, int npages) +static void +lnet_rtrpool_init(struct lnet_rtrbufpool *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_rtrpools_free(void) +lnet_rtrpools_free(int keep_pools) { - lnet_rtrbufpool_t *rtrp; + 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[0]); - lnet_rtrpool_free_bufs(&rtrp[1]); - lnet_rtrpool_free_bufs(&rtrp[2]); + 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); } - cfs_percpt_free(the_lnet.ln_rtrpools); - the_lnet.ln_rtrpools = NULL; + if (!keep_pools) { + cfs_percpt_free(the_lnet.ln_rtrpools); + the_lnet.ln_rtrpools = NULL; + } } static int -lnet_nrb_tiny_calculate(int npages) +lnet_nrb_tiny_calculate(void) { int nrbs = LNET_NRB_TINY; @@ -1432,7 +1196,7 @@ lnet_nrb_tiny_calculate(int npages) LCONSOLE_ERROR_MSG(0x10c, "tiny_router_buffers=%d invalid when " "routing enabled\n", tiny_router_buffers); - return -1; + return -EINVAL; } if (tiny_router_buffers > 0) @@ -1443,7 +1207,7 @@ lnet_nrb_tiny_calculate(int npages) } static int -lnet_nrb_small_calculate(int npages) +lnet_nrb_small_calculate(void) { int nrbs = LNET_NRB_SMALL; @@ -1451,7 +1215,7 @@ lnet_nrb_small_calculate(int npages) LCONSOLE_ERROR_MSG(0x10c, "small_router_buffers=%d invalid when " "routing enabled\n", small_router_buffers); - return -1; + return -EINVAL; } if (small_router_buffers > 0) @@ -1462,7 +1226,7 @@ lnet_nrb_small_calculate(int npages) } static int -lnet_nrb_large_calculate(int npages) +lnet_nrb_large_calculate(void) { int nrbs = LNET_NRB_LARGE; @@ -1470,7 +1234,7 @@ lnet_nrb_large_calculate(int npages) LCONSOLE_ERROR_MSG(0x10c, "large_router_buffers=%d invalid when " "routing enabled\n", large_router_buffers); - return -1; + return -EINVAL; } if (large_router_buffers > 0) @@ -1483,45 +1247,43 @@ lnet_nrb_large_calculate(int npages) int lnet_rtrpools_alloc(int im_a_router) { - lnet_rtrbufpool_t *rtrp; - int large_pages = (LNET_MTU + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; - int small_pages = 1; + 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 { - LCONSOLE_ERROR_MSG(0x10b, "'forwarding' not set to either " - "'enabled' or 'disabled'\n"); - return -EINVAL; - } - - nrb_tiny = lnet_nrb_tiny_calculate(0); + 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(small_pages); + nrb_small = lnet_nrb_small_calculate(); if (nrb_small < 0) return -EINVAL; - nrb_large = lnet_nrb_large_calculate(large_pages); + 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)); + sizeof(struct lnet_rtrbufpool)); if (the_lnet.ln_rtrpools == NULL) { LCONSOLE_ERROR_MSG(0x10c, "Failed to initialize router buffe pool\n"); @@ -1529,18 +1291,23 @@ lnet_rtrpools_alloc(int im_a_router) } cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) { - lnet_rtrpool_init(&rtrp[0], 0); - rc = lnet_rtrpool_alloc_bufs(&rtrp[0], nrb_tiny, i); + 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[1], small_pages); - rc = lnet_rtrpool_alloc_bufs(&rtrp[1], nrb_small, i); + 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[2], large_pages); - rc = lnet_rtrpool_alloc_bufs(&rtrp[2], nrb_large, i); + 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; } @@ -1548,211 +1315,209 @@ lnet_rtrpools_alloc(int im_a_router) lnet_net_lock(LNET_LOCK_EX); the_lnet.ln_routing = 1; lnet_net_unlock(LNET_LOCK_EX); - + wake_up(&the_lnet.ln_mt_waitq); return 0; failed: - lnet_rtrpools_free(); + lnet_rtrpools_free(0); return rc; } -int -lnet_notify(lnet_ni_t *ni, lnet_nid_t nid, int alive, cfs_time_t when) +static int +lnet_rtrpools_adjust_helper(int tiny, int small, int large) { - struct lnet_peer *lp = NULL; - cfs_time_t now = cfs_time_current(); - int cpt = lnet_cpt_of_nid(nid); - - 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; + 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; + } } - lp = lnet_find_peer_locked(the_lnet.ln_peer_tables[cpt], nid); - if (lp == NULL) { - /* nid not found */ - lnet_net_unlock(cpt); - CDEBUG(D_NET, "%s not found\n", libcfs_nid2str(nid)); - return 0; - } - - /* We can't fully trust LND on reporting exact peer last_alive - * if he notifies us about dead peer. For example ksocklnd can - * call us with when == _time_when_the_node_was_booted_ if - * no connections were successfully established */ - if (ni != NULL && !alive && when < lp->lp_last_alive) - when = lp->lp_last_alive; - - lnet_notify_locked(lp, ni == NULL, alive, when); - - lnet_ni_notify_locked(ni, lp); - - lnet_peer_decref_locked(lp); - - lnet_net_unlock(cpt); return 0; } -EXPORT_SYMBOL(lnet_notify); -void -lnet_get_tunables (void) +int +lnet_rtrpools_adjust(int tiny, int small, int large) { - return; -} + /* this function doesn't revert the changes if adding new buffers + * failed. It's up to the user space caller to revert the + * changes. */ -#else + if (!the_lnet.ln_routing) + return 0; -int -lnet_notify (lnet_ni_t *ni, lnet_nid_t nid, int alive, cfs_time_t when) -{ - return -EOPNOTSUPP; + return lnet_rtrpools_adjust_helper(tiny, small, large); } -void -lnet_router_checker (void) +int +lnet_rtrpools_enable(void) { - static time_t last = 0; - static int running = 0; - - time_t now = cfs_time_current_sec(); - int interval = now - last; - int rc; - __u64 version; - lnet_peer_t *rtr; + 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; - /* It's no use to call me again within a sec - all intervals and - * timeouts are measured in seconds */ - if (last != 0 && interval < 2) - return; + lnet_net_lock(LNET_LOCK_EX); + the_lnet.ln_routing = 1; - if (last != 0 && - interval > MAX(live_router_check_interval, - dead_router_check_interval)) - CNETERR("Checker(%d/%d) not called for %d seconds\n", - live_router_check_interval, dead_router_check_interval, - interval); + the_lnet.ln_ping_target->pb_info.pi_features &= + ~LNET_PING_FEAT_RTE_DISABLED; + lnet_net_unlock(LNET_LOCK_EX); - LASSERT(LNET_CPT_NUMBER == 1); + return rc; +} - lnet_net_lock(0); - LASSERT(!running); /* recursion check */ - running = 1; - lnet_net_unlock(0); +void +lnet_rtrpools_disable(void) +{ + if (!the_lnet.ln_routing) + return; - last = now; + 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; - if (the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING) - lnet_prune_rc_data(0); /* unlink all rcd and nowait */ + tiny_router_buffers = 0; + small_router_buffers = 0; + large_router_buffers = 0; + lnet_net_unlock(LNET_LOCK_EX); + lnet_rtrpools_free(1); +} - /* consume all pending events */ - while (1) { - int i; - lnet_event_t ev; +static inline void +lnet_notify_peer_down(struct lnet_ni *ni, lnet_nid_t nid) +{ + if (ni->ni_net->net_lnd->lnd_notify_peer_down != NULL) + (ni->ni_net->net_lnd->lnd_notify_peer_down)(nid); +} - /* NB ln_rc_eqh must be the 1st in 'eventqs' otherwise the - * recursion breaker in LNetEQPoll would fail */ - rc = LNetEQPoll(&the_lnet.ln_rc_eqh, 1, 0, &ev, &i); - if (rc == 0) /* no event pending */ - break; +/* + * 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, lnet_nid_t nid, bool alive, bool reset, + time64_t when) +{ + struct lnet_peer_ni *lpni = NULL; + time64_t now = ktime_get_seconds(); + int cpt; - /* NB a lost SENT prevents me from pinging a router again */ - if (rc == -EOVERFLOW) { - CERROR("Dropped an event!!!\n"); - abort(); - } + LASSERT (!in_interrupt ()); - LASSERT (rc == 1); + CDEBUG (D_NET, "%s notifying %s: %s\n", + (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid), + libcfs_nid2str(nid), + alive ? "up" : "down"); - lnet_router_checker_event(&ev); - } + 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; + } - if (the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING) { - lnet_prune_rc_data(1); /* release rcd */ - the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN; - running = 0; - return; - } + /* can't do predictions... */ + if (when > now) { + CWARN("Ignoring prediction from %s of %s %s " + "%lld seconds in the future\n", + (ni == NULL) ? "userspace" : libcfs_nid2str(ni->ni_nid), + libcfs_nid2str(nid), alive ? "up" : "down", when - now); + return -EINVAL; + } - LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING); + 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); - version = the_lnet.ln_routers_version; - cfs_list_for_each_entry (rtr, &the_lnet.ln_routers, lp_rtr_list) { - lnet_ping_router_locked(rtr); - LASSERT (version == the_lnet.ln_routers_version); - } - - lnet_net_unlock(0); - - running = 0; /* lock only needed for the recursion check */ - return; -} - -/* NB lnet_peers_start_down depends on me, - * so must be called before any peer creation */ -void -lnet_get_tunables (void) -{ - char *s; + if (the_lnet.ln_state != LNET_STATE_RUNNING) { + lnet_net_unlock(0); + return -ESHUTDOWN; + } - s = getenv("LNET_ROUTER_PING_TIMEOUT"); - if (s != NULL) router_ping_timeout = atoi(s); + lpni = lnet_find_peer_ni_locked(nid); + if (lpni == NULL) { + /* nid not found */ + lnet_net_unlock(0); + CDEBUG(D_NET, "%s not found\n", libcfs_nid2str(nid)); + return 0; + } - s = getenv("LNET_LIVE_ROUTER_CHECK_INTERVAL"); - if (s != NULL) live_router_check_interval = atoi(s); + if (alive) { + if (reset) + lnet_set_healthv(&lpni->lpni_healthv, + LNET_MAX_HEALTH_VALUE); + else + lnet_inc_healthv(&lpni->lpni_healthv); + } else { + lnet_handle_remote_failure_locked(lpni); + } - s = getenv("LNET_DEAD_ROUTER_CHECK_INTERVAL"); - if (s != NULL) dead_router_check_interval = atoi(s); + /* recalculate aliveness */ + alive = lnet_is_peer_ni_alive(lpni); + lnet_net_unlock(0); - /* This replaces old lnd_notify mechanism */ - check_routers_before_use = 1; - if (dead_router_check_interval <= 0) - dead_router_check_interval = 30; -} + if (ni != NULL && !alive) + lnet_notify_peer_down(ni, lpni->lpni_nid); -void -lnet_rtrpools_free(void) -{ -} + cpt = lpni->lpni_cpt; + lnet_net_lock(cpt); + lnet_peer_ni_decref_locked(lpni); + lnet_net_unlock(cpt); -int -lnet_rtrpools_alloc(int im_a_arouter) -{ - return 0; + return 0; } - -#endif +EXPORT_SYMBOL(lnet_notify);