--- /dev/null
+/*
+ * 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 "../../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 = "";
+module_param(forwarding, charp, 0444);
+MODULE_PARM_DESC(forwarding, "Explicitly enable/disable forwarding between networks");
+
+static int tiny_router_buffers;
+module_param(tiny_router_buffers, int, 0444);
+MODULE_PARM_DESC(tiny_router_buffers, "# of 0 payload messages to buffer in the router");
+static int small_router_buffers;
+module_param(small_router_buffers, int, 0444);
+MODULE_PARM_DESC(small_router_buffers, "# of small (1 page) messages to buffer in the router");
+static int large_router_buffers;
+module_param(large_router_buffers, int, 0444);
+MODULE_PARM_DESC(large_router_buffers, "# of large messages to buffer in the router");
+static int peer_buffer_credits;
+module_param(peer_buffer_credits, int, 0444);
+MODULE_PARM_DESC(peer_buffer_credits, "# router buffer credits per peer");
+
+static int auto_down = 1;
+module_param(auto_down, int, 0444);
+MODULE_PARM_DESC(auto_down, "Automatically mark peers down on comms error");
+
+int
+lnet_peer_buffer_credits(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;
+module_param(check_routers_before_use, int, 0444);
+MODULE_PARM_DESC(check_routers_before_use, "Assume routers are down and ping them before use");
+
+int avoid_asym_router_failure = 1;
+module_param(avoid_asym_router_failure, int, 0644);
+MODULE_PARM_DESC(avoid_asym_router_failure, "Avoid asymmetrical router failures (0 to disable)");
+
+static int dead_router_check_interval = 60;
+module_param(dead_router_check_interval, int, 0644);
+MODULE_PARM_DESC(dead_router_check_interval, "Seconds between dead router health checks (<= 0 to disable)");
+
+static int live_router_check_interval = 60;
+module_param(live_router_check_interval, int, 0644);
+MODULE_PARM_DESC(live_router_check_interval, "Seconds between live router health checks (<= 0 to disable)");
+
+static int router_ping_timeout = 50;
+module_param(router_ping_timeout, int, 0644);
+MODULE_PARM_DESC(router_ping_timeout, "Seconds to wait for the reply to a router health query");
+
+int
+lnet_peers_start_down(void)
+{
+ return check_routers_before_use;
+}
+
+void
+lnet_notify_locked(lnet_peer_t *lp, int notifylnd, int alive,
+ unsigned long when)
+{
+ if (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);
+}
+
+static 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 || ni == NULL)
+ 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;
+ 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;
+}
+
+/* NB expects LNET_LOCK held */
+static void
+lnet_add_route_to_rnet(lnet_remotenet_t *rnet, lnet_route_t *route)
+{
+ unsigned int len = 0;
+ unsigned int offset = 0;
+ struct list_head *e;
+
+ lnet_shuffle_seed();
+
+ list_for_each(e, &rnet->lrn_routes) {
+ len++;
+ }
+
+ /* len+1 positions to add a new entry, also prevents division by 0 */
+ offset = cfs_rand() % (len + 1);
+ list_for_each(e, &rnet->lrn_routes) {
+ if (offset == 0)
+ break;
+ offset--;
+ }
+ list_add(&route->lr_list, e);
+ list_add(&route->lr_gwlist, &route->lr_gateway->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,
+ unsigned int priority)
+{
+ 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 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;
+ }
+
+ INIT_LIST_HEAD(&rnet->lrn_routes);
+ rnet->lrn_net = net;
+ route->lr_hops = hops;
+ route->lr_net = net;
+ route->lr_priority = priority;
+
+ lnet_net_lock(LNET_LOCK_EX);
+
+ 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 */
+ 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, __u32 *priority)
+{
+ struct list_head *e1;
+ struct list_head *e2;
+ lnet_remotenet_t *rnet;
+ lnet_route_t *route;
+ int cpt;
+ int i;
+ struct list_head *rn_list;
+
+ cpt = lnet_net_lock_current();
+
+ for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
+ rn_list = &the_lnet.ln_remote_nets_hash[i];
+ list_for_each(e1, rn_list) {
+ rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
+
+ list_for_each(e2, &rnet->lrn_routes) {
+ route = list_entry(e2, lnet_route_t,
+ lr_list);
+
+ if (idx-- == 0) {
+ *net = rnet->lrn_net;
+ *hops = route->lr_hops;
+ *priority = route->lr_priority;
+ *gateway = route->lr_gateway->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);
+ }
+}
+
+/**
+ * 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);
+}
+
+static 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;
+
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(cfs_time_seconds(1));
+ }
+}
+
+void
+lnet_router_ni_update_locked(lnet_peer_t *gw, __u32 net)
+{
+ lnet_route_t *rte;
+
+ if ((gw->lp_ping_feats & LNET_PING_FEAT_NI_STATUS) != 0) {
+ list_for_each_entry(rte, &gw->lp_routes, lr_gwlist) {
+ if (rte->lr_net == net) {
+ rte->lr_downis = 0;
+ break;
+ }
+ }
+ }
+}
+
+static void
+lnet_update_ni_status_locked(void)
+{
+ lnet_ni_t *ni;
+ long now;
+ int timeout;
+
+ LASSERT(the_lnet.ln_routing);
+
+ timeout = router_ping_timeout +
+ max(live_router_check_interval, dead_router_check_interval);
+
+ now = get_seconds();
+ 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);
+ }
+}
+
+static void
+lnet_destroy_rc_data(lnet_rc_data_t *rcd)
+{
+ LASSERT(list_empty(&rcd->rcd_list));
+ /* detached from network */
+ LASSERT(LNetHandleIsInvalid(rcd->rcd_mdh));
+
+ if (rcd->rcd_gateway != NULL) {
+ int cpt = rcd->rcd_gateway->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));
+}
+
+static 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;
+
+ 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;
+ unsigned long 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);
+}
+
+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);
+}
+
+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");
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(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 schedule_timeout() here always adds 1 to load average
+ * because kernel counts # active tasks as nr_running
+ * + nr_uninterruptible. */
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule_timeout(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;
+}
+
+static void
+lnet_destroy_rtrbuf(lnet_rtrbuf_t *rb, int npages)
+{
+ int sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
+
+ while (--npages >= 0)
+ __free_page(rb->rb_kiov[npages].kiov_page);
+
+ LIBCFS_FREE(rb, sz);
+}
+
+static lnet_rtrbuf_t *
+lnet_new_rtrbuf(lnet_rtrbufpool_t *rbp, int cpt)
+{
+ int npages = rbp->rbp_npages;
+ int sz = offsetof(lnet_rtrbuf_t, rb_kiov[npages]);
+ struct page *page;
+ lnet_rtrbuf_t *rb;
+ int i;
+
+ LIBCFS_CPT_ALLOC(rb, lnet_cpt_table(), cpt, sz);
+ if (rb == NULL)
+ return NULL;
+
+ rb->rb_pool = rbp;
+
+ for (i = 0; i < npages; i++) {
+ page = 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;
+}
+
+static 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;
+}
+
+static 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;
+}
+
+static void
+lnet_rtrpool_init(lnet_rtrbufpool_t *rbp, int npages)
+{
+ INIT_LIST_HEAD(&rbp->rbp_msgs);
+ INIT_LIST_HEAD(&rbp->rbp_bufs);
+
+ rbp->rbp_npages = npages;
+ rbp->rbp_credits = 0;
+ rbp->rbp_mincredits = 0;
+}
+
+void
+lnet_rtrpools_free(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;
+ int small_pages = 1;
+ int nrb_tiny;
+ int nrb_small;
+ int nrb_large;
+ int rc;
+ int i;
+
+ large_pages = (LNET_MTU + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
+
+ 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, unsigned long when)
+{
+ struct lnet_peer *lp = NULL;
+ unsigned long 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)
+{
+}
+
+#else
+
+int
+lnet_notify(lnet_ni_t *ni, lnet_nid_t nid, int alive, unsigned long when)
+{
+ return -EOPNOTSUPP;
+}
+
+void
+lnet_router_checker(void)
+{
+ static time_t last;
+ static int running;
+
+ time_t now = get_seconds();
+ 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 */
+}
+
+/* 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
Code Review / kvmfornfv.git / blobdiff