diff options
Diffstat (limited to 'drivers/staging/lustre/lnet/lnet/router.c')
| -rw-r--r-- | drivers/staging/lustre/lnet/lnet/router.c | 1694 |
1 files changed, 1694 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lnet/lnet/router.c b/drivers/staging/lustre/lnet/lnet/router.c new file mode 100644 index 000000000000..a326ce06bc76 --- /dev/null +++ b/drivers/staging/lustre/lnet/lnet/router.c @@ -0,0 +1,1694 @@ +/* + * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. + * + * Copyright (c) 2011, 2012, Intel Corporation. + * + * This file is part of Portals + * http://sourceforge.net/projects/sandiaportals/ + * + * 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 <linux/lnet/lib-lnet.h> + +#if defined(LNET_ROUTER) + +#define LNET_NRB_TINY_MIN 512 /* min value for each CPT */ +#define LNET_NRB_TINY (LNET_NRB_TINY_MIN * 4) +#define LNET_NRB_SMALL_MIN 4096 /* min value for each CPT */ +#define LNET_NRB_SMALL (LNET_NRB_SMALL_MIN * 4) +#define LNET_NRB_LARGE_MIN 256 /* min value for each CPT */ +#define LNET_NRB_LARGE (LNET_NRB_LARGE_MIN * 4) + +static char *forwarding = ""; +CFS_MODULE_PARM(forwarding, "s", charp, 0444, + "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"); +static int small_router_buffers; +CFS_MODULE_PARM(small_router_buffers, "i", int, 0444, + "# 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"); + +static int auto_down = 1; +CFS_MODULE_PARM(auto_down, "i", int, 0444, + "Automatically mark peers down on comms error"); + +int +lnet_peer_buffer_credits(lnet_ni_t *ni) +{ + /* NI option overrides LNet default */ + if (ni->ni_peerrtrcredits > 0) + return ni->ni_peerrtrcredits; + if (peer_buffer_credits > 0) + return peer_buffer_credits; + + /* As an approximation, allow this peer the same number of router + * buffers as it is allowed outstanding sends */ + return ni->ni_peertxcredits; +} + +/* forward ref's */ +static int lnet_router_checker(void *); +#else + +int +lnet_peer_buffer_credits(lnet_ni_t *ni) +{ + return 0; +} + +#endif + +static int check_routers_before_use = 0; +CFS_MODULE_PARM(check_routers_before_use, "i", int, 0444, + "Assume routers are down and ping them before use"); + +static int avoid_asym_router_failure = 1; +CFS_MODULE_PARM(avoid_asym_router_failure, "i", int, 0644, + "Avoid asymmetrical router failures (0 to disable)"); + +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)"); + +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)"); + +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"); + +int +lnet_peers_start_down(void) +{ + return check_routers_before_use; +} + +void +lnet_notify_locked(lnet_peer_t *lp, int notifylnd, int alive, cfs_time_t when) +{ + 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); +} + +void +lnet_ni_notify_locked(lnet_ni_t *ni, lnet_peer_t *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 */ + + if (lp->lp_notifying) + return; + + lp->lp_notifying = 1; + + while (lp->lp_notify) { + alive = lp->lp_alive; + notifylnd = lp->lp_notifylnd; + + lp->lp_notifylnd = 0; + lp->lp_notify = 0; + + if (notifylnd && ni->ni_lnd->lnd_notify != NULL) { + lnet_net_unlock(lp->lp_cpt); + + /* A new notification could happen now; I'll handle it + * when control returns to me */ + + (ni->ni_lnd->lnd_notify)(ni, lp->lp_nid, alive); + + lnet_net_lock(lp->lp_cpt); + } + } + + lp->lp_notifying = 0; +} + + +static void +lnet_rtr_addref_locked(lnet_peer_t *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) { + struct list_head *pos; + + /* a simple insertion sort */ + list_for_each_prev(pos, &the_lnet.ln_routers) { + lnet_peer_t *rtr = list_entry(pos, lnet_peer_t, + lp_rtr_list); + + if (rtr->lp_nid < lp->lp_nid) + break; + } + + list_add(&lp->lp_rtr_list, pos); + /* addref for the_lnet.ln_routers */ + lnet_peer_addref_locked(lp); + the_lnet.ln_routers_version++; + } +} + +static void +lnet_rtr_decref_locked(lnet_peer_t *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 == 0) { + LASSERT(list_empty(&lp->lp_routes)); + + if (lp->lp_rcd != NULL) { + list_add(&lp->lp_rcd->rcd_list, + &the_lnet.ln_rcd_deathrow); + lp->lp_rcd = NULL; + } + + 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) +{ + 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 = 0; + int lnd_type, seed[2]; + struct timeval tv; + lnet_ni_t *ni; + struct list_head *tmp; + + if (seeded) + return; + + cfs_get_random_bytes(seed, sizeof(seed)); + + /* Nodes with small feet have little entropy + * the NID for this node gives the most entropy in the low bits */ + list_for_each(tmp, &the_lnet.ln_nis) { + ni = list_entry(tmp, lnet_ni_t, ni_list); + lnd_type = LNET_NETTYP(LNET_NIDNET(ni->ni_nid)); + + if (lnd_type != LOLND) + seed[0] ^= (LNET_NIDADDR(ni->ni_nid) | lnd_type); + } + + 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) +{ + 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->lp_routes); + + the_lnet.ln_remote_nets_version++; + lnet_rtr_addref_locked(route->lr_gateway); +} + +int +lnet_add_route (__u32 net, unsigned int hops, lnet_nid_t gateway) +{ + struct list_head *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 gw %s\n", + libcfs_net2str(net), hops, libcfs_nid2str(gateway)); + + if (gateway == LNET_NID_ANY || + LNET_NETTYP(LNET_NIDNET(gateway)) == LOLND || + net == LNET_NIDNET(LNET_NID_ANY) || + LNET_NETTYP(net) == LOLND || + LNET_NIDNET(gateway) == net || + hops < 1 || hops > 255) + return (-EINVAL); + + if (lnet_islocalnet(net)) /* it's a local network */ + return 0; /* ignore the route entry */ + + /* Assume net, route, all new */ + LIBCFS_ALLOC(route, sizeof(*route)); + LIBCFS_ALLOC(rnet, sizeof(*rnet)); + if (route == NULL || rnet == NULL) { + CERROR("Out of memory creating route %s %d %s\n", + libcfs_net2str(net), hops, libcfs_nid2str(gateway)); + if (route != NULL) + LIBCFS_FREE(route, sizeof(*route)); + if (rnet != NULL) + LIBCFS_FREE(rnet, sizeof(*rnet)); + return -ENOMEM; + } + + INIT_LIST_HEAD(&rnet->lrn_routes); + rnet->lrn_net = net; + route->lr_hops = hops; + route->lr_net = net; + + lnet_net_lock(LNET_LOCK_EX); + + rc = lnet_nid2peer_locked(&route->lr_gateway, gateway, LNET_LOCK_EX); + if (rc != 0) { + 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 */ + 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->lp_nid != gateway); + } + + if (add_route) { + lnet_peer_addref_locked(route->lr_gateway); /* +1 for notify */ + lnet_add_route_to_rnet(rnet2, route); + + ni = route->lr_gateway->lp_ni; + lnet_net_unlock(LNET_LOCK_EX); + + /* XXX Assume alive */ + if (ni->ni_lnd->lnd_notify != NULL) + (ni->ni_lnd->lnd_notify)(ni, gateway, 1); + + lnet_net_lock(LNET_LOCK_EX); + } + + /* -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)); + + if (rnet != rnet2) + LIBCFS_FREE(rnet, sizeof(*rnet)); + + return 0; +} + +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->lp_ni == + route2->lr_gateway->lp_ni) + continue; + + nid1 = route->lr_gateway->lp_nid; + nid2 = route2->lr_gateway->lp_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 *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->lp_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_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_route(int idx, __u32 *net, __u32 *hops, + lnet_nid_t *gateway, __u32 *alive) +{ + 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; + *gateway = route->lr_gateway->lp_nid; + *alive = route->lr_gateway->lp_alive; + lnet_net_unlock(cpt); + return 0; + } + } + } + } + + lnet_net_unlock(cpt); + 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_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 */ + + list_for_each_entry(rtr, &gw->lp_routes, lr_gwlist) { + int ptl_status = LNET_NI_STATUS_INVALID; + int down = 0; + int up = 0; + int i; + + for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) { + lnet_ni_status_t *stat = &info->pi_ni[i]; + lnet_nid_t nid = stat->ns_nid; + + if (nid == LNET_NID_ANY) { + CDEBUG(D_NET, "%s: unexpected LNET_NID_ANY\n", + libcfs_nid2str(gw->lp_nid)); + gw->lp_ping_feats = LNET_PING_FEAT_INVAL; + return; + } + + if (LNET_NETTYP(LNET_NIDNET(nid)) == LOLND) + continue; + + if (stat->ns_status == LNET_NI_STATUS_DOWN) { + if (LNET_NETTYP(LNET_NIDNET(nid)) != PTLLND) + down++; + else if (ptl_status != LNET_NI_STATUS_UP) + ptl_status = LNET_NI_STATUS_DOWN; + continue; + } + + if (stat->ns_status == LNET_NI_STATUS_UP) { + if (LNET_NIDNET(nid) == rtr->lr_net) { + up = 1; + break; + } + /* ptl NIs are considered down only when + * they're all down */ + if (LNET_NETTYP(LNET_NIDNET(nid)) == PTLLND) + ptl_status = LNET_NI_STATUS_UP; + continue; + } + + 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; + return; + } + + if (up) { /* ignore downed NIs if NI for dest network is up */ + rtr->lr_downis = 0; + continue; + } + rtr->lr_downis = down + (ptl_status == LNET_NI_STATUS_DOWN); + } +} + +static void +lnet_router_checker_event(lnet_event_t *event) +{ + 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); + + /* 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; + } + + /* 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; + 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, lnet_peer_t, lp_rtr_list); + + if (rtr->lp_alive_count == 0) { + all_known = 0; + break; + } + } + + lnet_net_unlock(cpt); + + if (all_known) + return; + + cfs_pause(cfs_time_seconds(1)); + } +} + +void +lnet_update_ni_status_locked(void) +{ + lnet_ni_t *ni; + long now; + int timeout; + + LASSERT(the_lnet.ln_routing); + + timeout = router_ping_timeout + + MAX(live_router_check_interval, dead_router_check_interval); + + now = cfs_time_current_sec(); + list_for_each_entry(ni, &the_lnet.ln_nis, ni_list) { + if (ni->ni_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); + } +} + +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->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)); +} + +lnet_rc_data_t * +lnet_create_rc_data_locked(lnet_peer_t *gateway) +{ + 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); + 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); + } + + 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) +{ + int rc; + int eqsz; + + 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; + + 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); + if (rc != 0) { + CERROR("Can't allocate EQ(%d): %d\n", eqsz, rc); + return -ENOMEM; + } + + the_lnet.ln_rc_state = LNET_RC_STATE_RUNNING; + 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; + } + + 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; + + /* 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; + lnet_peer_t *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, + lp_rtr_list) { + if (lp->lp_rcd == NULL) + continue; + + LASSERT(list_empty(&lp->lp_rcd->rcd_list)); + list_add(&lp->lp_rcd->rcd_list, + &the_lnet.ln_rcd_deathrow); + lp->lp_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"); + cfs_pause(cfs_time_seconds(1) / 4); + + lnet_net_lock(LNET_LOCK_EX); + } + + lnet_net_unlock(LNET_LOCK_EX); +} + + +#if defined(LNET_ROUTER) + +static int +lnet_router_checker(void *arg) +{ + lnet_peer_t *rtr; + struct list_head *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; + + cpt = lnet_net_lock_current(); +rescan: + version = the_lnet.ln_routers_version; + + list_for_each(entry, &the_lnet.ln_routers) { + rtr = 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; + } + + 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 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)); + } + + LASSERT(the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING); + + 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); +} + +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 = alloc_pages_node( + cfs_cpt_spread_node(lnet_cpt_table(), cpt), + __GFP_ZERO | GFP_IOFS, 0); + 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_CACHE_SIZE; + rb->rb_kiov[i].kiov_offset = 0; + rb->rb_kiov[i].kiov_page = page; + } + + return rb; +} + +void +lnet_rtrpool_free_bufs(lnet_rtrbufpool_t *rbp) +{ + int npages = rbp->rbp_npages; + int nbuffers = 0; + lnet_rtrbuf_t *rb; + + if (rbp->rbp_nbuffers == 0) /* not initialized or already freed */ + return; + + LASSERT (list_empty(&rbp->rbp_msgs)); + LASSERT (rbp->rbp_credits == rbp->rbp_nbuffers); + + while (!list_empty(&rbp->rbp_bufs)) { + LASSERT (rbp->rbp_credits > 0); + + rb = list_entry(rbp->rbp_bufs.next, + lnet_rtrbuf_t, rb_list); + list_del(&rb->rb_list); + lnet_destroy_rtrbuf(rb, npages); + nbuffers++; + } + + LASSERT (rbp->rbp_nbuffers == nbuffers); + LASSERT (rbp->rbp_credits == nbuffers); + + rbp->rbp_nbuffers = rbp->rbp_credits = 0; +} + +int +lnet_rtrpool_alloc_bufs(lnet_rtrbufpool_t *rbp, int nbufs, int cpt) +{ + lnet_rtrbuf_t *rb; + int i; + + if (rbp->rbp_nbuffers != 0) { + LASSERT (rbp->rbp_nbuffers == nbufs); + return 0; + } + + for (i = 0; i < nbufs; i++) { + rb = lnet_new_rtrbuf(rbp, cpt); + + if (rb == NULL) { + CERROR("Failed to allocate %d router bufs of %d pages\n", + nbufs, rbp->rbp_npages); + return -ENOMEM; + } + + rbp->rbp_nbuffers++; + rbp->rbp_credits++; + rbp->rbp_mincredits++; + list_add(&rb->rb_list, &rbp->rbp_bufs); + + /* No allocation "under fire" */ + /* Otherwise we'd need code to schedule blocked msgs etc */ + LASSERT (!the_lnet.ln_routing); + } + + LASSERT (rbp->rbp_credits == nbufs); + return 0; +} + +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(void) +{ + 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[0]); + lnet_rtrpool_free_bufs(&rtrp[1]); + lnet_rtrpool_free_bufs(&rtrp[2]); + } + + cfs_percpt_free(the_lnet.ln_rtrpools); + the_lnet.ln_rtrpools = NULL; +} + +static int +lnet_nrb_tiny_calculate(int npages) +{ + 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 -1; + } + + 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(int npages) +{ + 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 -1; + } + + 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(int npages) +{ + 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 -1; + } + + 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 large_pages = (LNET_MTU + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; + int small_pages = 1; + 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 (nrb_tiny < 0) + return -EINVAL; + + nrb_small = lnet_nrb_small_calculate(small_pages); + if (nrb_small < 0) + return -EINVAL; + + nrb_large = lnet_nrb_large_calculate(large_pages); + 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[0], 0); + rc = lnet_rtrpool_alloc_bufs(&rtrp[0], 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); + if (rc != 0) + goto failed; + + lnet_rtrpool_init(&rtrp[2], large_pages); + rc = lnet_rtrpool_alloc_bufs(&rtrp[2], 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(); + return rc; +} + +int +lnet_notify(lnet_ni_t *ni, lnet_nid_t nid, int alive, cfs_time_t when) +{ + 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; + } + + 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) +{ + return; +} + +#else + +int +lnet_notify (lnet_ni_t *ni, lnet_nid_t nid, int alive, cfs_time_t when) +{ + return -EOPNOTSUPP; +} + +void +lnet_router_checker (void) +{ + static time_t last = 0; + static int running = 0; + + time_t now = cfs_time_current_sec(); + int interval = now - last; + int rc; + __u64 version; + lnet_peer_t *rtr; + + /* It's no use to call me again within a sec - all intervals and + * timeouts are measured in seconds */ + if (last != 0 && interval < 2) + return; + + if (last != 0 && + interval > MAX(live_router_check_interval, + dead_router_check_interval)) + CNETERR("Checker(%d/%d) not called for %d seconds\n", + live_router_check_interval, dead_router_check_interval, + interval); + + LASSERT(LNET_CPT_NUMBER == 1); + + lnet_net_lock(0); + LASSERT(!running); /* recursion check */ + running = 1; + lnet_net_unlock(0); + + last = now; + + if (the_lnet.ln_rc_state == LNET_RC_STATE_STOPPING) + lnet_prune_rc_data(0); /* unlink all rcd and nowait */ + + /* consume all pending events */ + while (1) { + int i; + lnet_event_t ev; + + /* NB ln_rc_eqh must be the 1st in 'eventqs' otherwise the + * recursion breaker in LNetEQPoll would fail */ + rc = LNetEQPoll(&the_lnet.ln_rc_eqh, 1, 0, &ev, &i); + if (rc == 0) /* no event pending */ + break; + + /* NB a lost SENT prevents me from pinging a router again */ + if (rc == -EOVERFLOW) { + CERROR("Dropped an event!!!\n"); + abort(); + } + + LASSERT (rc == 1); + + lnet_router_checker_event(&ev); + } + + 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; + } + + LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING); + + lnet_net_lock(0); + + version = the_lnet.ln_routers_version; + 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; + + s = getenv("LNET_ROUTER_PING_TIMEOUT"); + if (s != NULL) router_ping_timeout = atoi(s); + + s = getenv("LNET_LIVE_ROUTER_CHECK_INTERVAL"); + if (s != NULL) live_router_check_interval = atoi(s); + + s = getenv("LNET_DEAD_ROUTER_CHECK_INTERVAL"); + if (s != NULL) dead_router_check_interval = atoi(s); + + /* This replaces old lnd_notify mechanism */ + check_routers_before_use = 1; + if (dead_router_check_interval <= 0) + dead_router_check_interval = 30; +} + +void +lnet_rtrpools_free(void) +{ +} + +int +lnet_rtrpools_alloc(int im_a_arouter) +{ + return 0; +} + +#endif |