/*
* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
*
- * Copyright (c) 2011, 2014, 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
*/
#define DEBUG_SUBSYSTEM S_LNET
-#include <lnet/lib-lnet.h>
-#if defined(__KERNEL__) && defined(LNET_ROUTER)
+#include <linux/random.h>
+#include <lnet/lib-lnet.h>
#define LNET_NRB_TINY_MIN 512 /* min value for each CPT */
#define LNET_NRB_TINY (LNET_NRB_TINY_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_CACHE_SIZE - 1) >> \
- PAGE_CACHE_SHIFT)
+#define LNET_NRB_LARGE_PAGES ((LNET_MTU + PAGE_SIZE - 1) >> \
+ PAGE_SHIFT)
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 dead_router_check_interval = INT_MIN;
+module_param(dead_router_check_interval, int, 0444);
+MODULE_PARM_DESC(dead_router_check_interval, "(DEPRECATED - Use alive_router_check_interval)");
+
+int live_router_check_interval = INT_MIN;
+module_param(live_router_check_interval, int, 0444);
+MODULE_PARM_DESC(live_router_check_interval, "(DEPRECATED - Use alive_router_check_interval)");
+
+int alive_router_check_interval = 60;
+module_param(alive_router_check_interval, int, 0644);
+MODULE_PARM_DESC(alive_router_check_interval, "Seconds between live router health checks (<= 0 to disable)");
+
+static int router_ping_timeout = 50;
+module_param(router_ping_timeout, int, 0644);
+MODULE_PARM_DESC(router_ping_timeout, "Seconds to wait for the reply to a router health query");
+
+/*
+ * A value between 0 and 100. 0 meaning that even if router's interfaces
+ * have the worse health still consider the gateway usable.
+ * 100 means that at least one interface on the route's remote net is 100%
+ * healthy to consider the route alive.
+ * The default is set to 100 to ensure we maintain the original behavior.
+ */
+unsigned int router_sensitivity_percentage = 100;
+static int rtr_sensitivity_set(const char *val, cfs_kernel_param_arg_t *kp);
+static struct kernel_param_ops param_ops_rtr_sensitivity = {
+ .set = rtr_sensitivity_set,
+ .get = param_get_int,
+};
+#define param_check_rtr_sensitivity(name, p) \
+ __param_check(name, p, int)
+#ifdef HAVE_KERNEL_PARAM_OPS
+module_param(router_sensitivity_percentage, rtr_sensitivity, S_IRUGO|S_IWUSR);
#else
+module_param_call(router_sensitivity_percentage, rtr_sensitivity_set, param_get_int,
+ &router_sensitivity_percentage, S_IRUGO|S_IWUSR);
+#endif
+MODULE_PARM_DESC(router_sensitivity_percentage,
+ "How healthy a gateway should be to be used in percent");
-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;
-#endif
+ rc = kstrtoul(val, 0, &value);
+ if (rc) {
+ CERROR("Invalid module parameter value for 'router_sensitivity_percentage'\n");
+ return rc;
+ }
-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");
+ if (value < 0 || value > 100) {
+ CERROR("Invalid value: %lu for 'router_sensitivity_percentage'\n", value);
+ return -EINVAL;
+ }
-int avoid_asym_router_failure = 1;
-CFS_MODULE_PARM(avoid_asym_router_failure, "i", int, 0644,
- "Avoid asymmetrical router failures (0 to disable)");
+ /*
+ * 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 dead_router_check_interval = 60;
-CFS_MODULE_PARM(dead_router_check_interval, "i", int, 0644,
- "Seconds between dead router health checks (<= 0 to disable)");
+ *sen = value;
-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)");
+ mutex_unlock(&the_lnet.ln_api_mutex);
-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");
+ return 0;
+}
+
+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)
+/*
+ * The peer_net of a gateway is alive if at least one of the peer_ni's on
+ * that peer_net is alive.
+ */
+static bool
+lnet_is_gateway_net_alive(struct lnet_peer_net *lpn)
{
- 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 */
+ struct lnet_peer_ni *lpni;
- CDEBUG(D_NET, "set %s %d\n", libcfs_nid2str(lp->lp_nid), alive);
+ list_for_each_entry(lpni, &lpn->lpn_peer_nis, lpni_peer_nis) {
+ if (lnet_is_peer_ni_alive(lpni))
+ return true;
+ }
+
+ return false;
}
-static void
-lnet_ni_notify_locked(lnet_ni_t *ni, lnet_peer_t *lp)
+/*
+ * 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)
{
- 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 */
+ struct lnet_peer_net *lpn;
- if (lp->lp_notifying)
- return;
+ if (!gw->lp_alive)
+ return false;
- 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;
- if (notifylnd && ni->ni_lnd->lnd_notify != NULL) {
- lnet_net_unlock(lp->lp_cpt);
+ /* If the gateway is down then all routes are considered down */
+ if (!gw->lp_alive)
+ return false;
+
+ /*
+ * if discovery is disabled then rely on the cached aliveness
+ * information. This is handicapped information which we log when
+ * we receive the discovery ping response. The most uptodate
+ * aliveness information can only be obtained when discovery is
+ * enabled.
+ */
+ if (lnet_is_discovery_disabled(gw))
+ return route->lr_alive;
+
+ /*
+ * check the gateway's interfaces on the local network
+ */
+ llpn = lnet_peer_get_net_locked(gw, route->lr_lnet);
+ if (!llpn)
+ return false;
+
+ if (!lnet_is_gateway_net_alive(llpn))
+ return false;
+
+ if (avoid_asym_router_failure) {
+ /* Check the gateway's interfaces on the remote network */
+ rlpn = lnet_peer_get_net_locked(gw, route->lr_net);
+ if (!rlpn)
+ return false;
+ if (!lnet_is_gateway_net_alive(rlpn))
+ return false;
+ }
- /* 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)) {
+ spin_unlock(&gw->lp_lock);
+ if (gw->lp_rtr_refcount > 0)
+ CERROR("peer %s is being used as a gateway but routing feature is not turned on\n",
+ libcfs_nid2str(gw->lp_primary_nid));
+ return false;
+ }
+ spin_unlock(&gw->lp_lock);
- (ni->ni_lnd->lnd_notify)(ni, lp->lp_nid, alive);
+ return true;
+}
- 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;
}
+static inline void
+lnet_set_route_aliveness(struct lnet_route *route, bool alive)
+{
+ /* Log when there's a state change */
+ if (route->lr_alive != alive) {
+ CERROR("route to %s through %s has gone from %s to %s\n",
+ libcfs_net2str(route->lr_net),
+ libcfs_nid2str(route->lr_gateway->lp_primary_nid),
+ (route->lr_alive) ? "up" : "down",
+ alive ? "up" : "down");
+ route->lr_alive = alive;
+ }
+}
+
+void
+lnet_router_discovery_ping_reply(struct lnet_peer *lp)
+{
+ struct lnet_ping_buffer *pbuf = lp->lp_data;
+ struct lnet_remotenet *rnet;
+ struct lnet_peer_net *llpn;
+ struct lnet_route *route;
+ bool net_up = false;
+ unsigned lp_state;
+ __u32 net, net2;
+ int i, j;
+
+
+ spin_lock(&lp->lp_lock);
+ lp_state = lp->lp_state;
+
+ /* only handle replies if discovery is disabled. */
+ if (!lnet_is_discovery_disabled_locked(lp)) {
+ spin_unlock(&lp->lp_lock);
+ return;
+ }
+
+ spin_unlock(&lp->lp_lock);
+
+ if (lp_state & LNET_PEER_PING_FAILED ||
+ pbuf->pb_info.pi_features & LNET_PING_FEAT_RTE_DISABLED) {
+ CDEBUG(D_NET, "Set routes down for gw %s because %s %d\n",
+ libcfs_nid2str(lp->lp_primary_nid),
+ lp_state & LNET_PEER_PING_FAILED ? "ping failed" :
+ "route feature is disabled", lp->lp_ping_error);
+ /* If the ping failed or the peer has routing disabled then
+ * mark the routes served by this peer down
+ */
+ list_for_each_entry(route, &lp->lp_routes, lr_gwlist)
+ lnet_set_route_aliveness(route, false);
+ return;
+ }
+
+ CDEBUG(D_NET, "Discovery is disabled. Processing reply for gw: %s\n",
+ libcfs_nid2str(lp->lp_primary_nid));
+
+ /*
+ * examine the ping response:
+ * For each NID in the ping response, extract the net
+ * if the net exists on our remote net list then
+ * iterate over the routes on the rnet and if:
+ * The route's local net is healthy and
+ * The remote net status is UP, then mark the route up
+ * otherwise mark the route down
+ */
+ for (i = 1; i < pbuf->pb_info.pi_nnis; i++) {
+ net = LNET_NIDNET(pbuf->pb_info.pi_ni[i].ns_nid);
+ rnet = lnet_find_rnet_locked(net);
+ if (!rnet)
+ continue;
+ list_for_each_entry(route, &rnet->lrn_routes, lr_list) {
+ /* check if this is the route's gateway */
+ if (lp->lp_primary_nid !=
+ route->lr_gateway->lp_primary_nid)
+ continue;
+
+ llpn = lnet_peer_get_net_locked(lp, route->lr_lnet);
+ if (!llpn) {
+ lnet_set_route_aliveness(route, false);
+ continue;
+ }
+
+ if (!lnet_is_gateway_net_alive(llpn)) {
+ lnet_set_route_aliveness(route, false);
+ continue;
+ }
+
+ if (avoid_asym_router_failure &&
+ pbuf->pb_info.pi_ni[i].ns_status !=
+ LNET_NI_STATUS_UP) {
+ net_up = false;
+
+ /*
+ * revisit all previous NIDs and check if
+ * any on the network we're examining is
+ * up. If at least one is up then we consider
+ * the route to be alive.
+ */
+ for (j = 1; j < i; j++) {
+ net2 = LNET_NIDNET(pbuf->pb_info.
+ pi_ni[j].ns_nid);
+ if (net2 == net &&
+ pbuf->pb_info.pi_ni[j].ns_status ==
+ LNET_NI_STATUS_UP)
+ net_up = true;
+ }
+ if (!net_up) {
+ lnet_set_route_aliveness(route, false);
+ continue;
+ }
+ }
+
+ lnet_set_route_aliveness(route, true);
+ }
+ }
+}
+
+void
+lnet_router_discovery_complete(struct lnet_peer *lp)
+{
+ struct lnet_peer_ni *lpni = NULL;
+ struct lnet_route *route;
+
+ spin_lock(&lp->lp_lock);
+ lp->lp_state &= ~LNET_PEER_RTR_DISCOVERY;
+ lp->lp_state |= LNET_PEER_RTR_DISCOVERED;
+ lp->lp_alive = lp->lp_dc_error == 0;
+ spin_unlock(&lp->lp_lock);
+
+ /*
+ * Router discovery successful? All peer information would've been
+ * updated already. No need to do any more processing
+ */
+ if (lp->lp_alive)
+ return;
+
+ /*
+ * We do not send messages directly to the remote interfaces
+ * of an LNet router. As such, we rely on the PING response
+ * to determine the up/down status of these interfaces. If
+ * a PING response is not receieved, or some other problem with
+ * discovery occurs that prevents us from getting this status,
+ * we assume all interfaces are down until we're able to
+ * determine otherwise.
+ */
+ CDEBUG(D_NET, "%s: Router discovery failed %d\n",
+ libcfs_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;
+
+ list_for_each_entry(route, &lp->lp_routes, lr_gwlist)
+ lnet_set_route_aliveness(route, false);
+}
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) {
- 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);
+ 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 */
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);
}
}
-lnet_remotenet_t *
-lnet_find_net_locked (__u32 net)
+struct lnet_remotenet *
+lnet_find_rnet_locked(__u32 net)
{
- lnet_remotenet_t *rnet;
+ 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);
list_for_each(tmp, rn_list) {
- rnet = list_entry(tmp, lnet_remotenet_t, lrn_list);
+ rnet = list_entry(tmp, struct lnet_remotenet, lrn_list);
if (rnet->lrn_net == net)
return rnet;
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;
+ static int seeded;
+ struct lnet_ni *ni = NULL;
- if (seeded)
- return;
-
- cfs_get_random_bytes(seed, sizeof(seed));
+ if (seeded)
+ return;
/* 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));
+ while ((ni = lnet_get_next_ni_locked(NULL, ni)))
+ add_device_randomness(&ni->ni_nid, sizeof(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 */
static void
-lnet_add_route_to_rnet(lnet_remotenet_t *rnet, lnet_route_t *route)
+lnet_add_route_to_rnet(struct lnet_remotenet *rnet, struct lnet_route *route)
{
- unsigned int len = 0;
- unsigned int offset = 0;
+ 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) {
+ 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);
+ /*
+ * 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 = prandom_u32_max(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);
+ /*
+ * 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)
{
- 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",
+ 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 ||
net == LNET_NIDNET(LNET_NID_ANY) ||
LNET_NETTYP(net) == LOLND ||
LNET_NIDNET(gateway) == net ||
- hops < 1 || hops > 255)
+ (hops != LNET_UNDEFINED_HOPS && (hops < 1 || hops > 255)))
return -EINVAL;
- if (lnet_islocalnet(net)) /* it's a local network */
+ /* 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 -EHOSTUNREACH;
+ }
+
/* Assume net, route, all new */
LIBCFS_ALLOC(route, sizeof(*route));
LIBCFS_ALLOC(rnet, sizeof(*rnet));
INIT_LIST_HEAD(&rnet->lrn_routes);
rnet->lrn_net = net;
- route->lr_hops = hops;
+ /* 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 rc; /* ignore the route entry */
+ rc = PTR_ERR(lpni);
CERROR("Error %d creating route %s %d %s\n", rc,
libcfs_net2str(net), hops,
libcfs_nid2str(gateway));
return rc;
}
- LASSERT(!the_lnet.ln_shutdown);
+ LASSERT(lpni->lpni_peer_net && lpni->lpni_peer_net->lpn_peer);
+ gw = lpni->lpni_peer_net->lpn_peer;
- rnet2 = lnet_find_net_locked(net);
+ route->lr_gateway = gw;
+
+ rnet2 = lnet_find_rnet_locked(net);
if (rnet2 == NULL) {
/* new network */
list_add_tail(&rnet->lrn_list, lnet_net2rnethash(net));
/* 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);
+ list_for_each(route_entry, &rnet2->lrn_routes) {
+ struct lnet_route *route2;
+ route2 = list_entry(route_entry, struct lnet_route, lr_list);
if (route2->lr_gateway == route->lr_gateway) {
add_route = 0;
break;
}
/* our lookups must be true */
- LASSERT(route2->lr_gateway->lp_nid != gateway);
+ LASSERT(route2->lr_gateway->lp_primary_nid != gateway);
}
+ /*
+ * It is possible to add multiple routes through the same peer,
+ * but it'll be using a different NID of that peer. When the
+ * gateway is discovered, discovery will consolidate the different
+ * peers into one peer. In this case the discovery code will have
+ * to move the routes from the peer that's being deleted to the
+ * consolidated peer lp_routes list
+ */
if (add_route) {
- lnet_peer_addref_locked(route->lr_gateway); /* +1 for notify */
+ gw->lp_health_sensitivity = sensitivity;
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);
+ if (lnet_peer_discovery_disabled)
+ CWARN("Consider turning discovery on to enable full "
+ "Multi-Rail routing functionality\n");
}
- /* -1 for notify or !add_route */
- lnet_peer_decref_locked(route->lr_gateway);
+ /*
+ * get rid of the reference on the lpni.
+ */
+ lnet_peer_ni_decref_locked(lpni);
lnet_net_unlock(LNET_LOCK_EX);
rc = 0;
if (rnet != rnet2)
LIBCFS_FREE(rnet, sizeof(*rnet));
- /* indicate to startup the router checker if configured */
- wake_up(&the_lnet.ln_rc_waitq);
+ /* kick start the monitor thread to handle the added route */
+ complete(&the_lnet.ln_mt_wait_complete);
return rc;
}
-int
-lnet_check_routes(void)
-{
- lnet_remotenet_t *rnet;
- lnet_route_t *route;
- lnet_route_t *route2;
- struct list_head *e1;
- struct list_head *e2;
- int cpt;
- struct list_head *rn_list;
- int i;
-
- cpt = lnet_net_lock_current();
-
- for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
- rn_list = &the_lnet.ln_remote_nets_hash[i];
- list_for_each(e1, rn_list) {
- rnet = list_entry(e1, lnet_remotenet_t, lrn_list);
-
- route2 = NULL;
- list_for_each(e2, &rnet->lrn_routes) {
- lnet_nid_t nid1;
- lnet_nid_t nid2;
- int net;
-
- route = list_entry(e2, lnet_route_t,
- lr_list);
-
- if (route2 == NULL) {
- route2 = route;
- continue;
- }
-
- if (route->lr_gateway->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)
+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;
- 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))
+ 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;
- 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;
+ /*
+ * 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(LNET_LOCK_EX);
-
- return rc;
-}
-
-void
-lnet_destroy_routes (void)
-{
- lnet_del_route(LNET_NIDNET(LNET_NID_ANY), LNET_NID_ANY);
-}
-
-int lnet_get_rtr_pool_cfg(int idx, struct lnet_ioctl_pool_cfg *pool_cfg)
-{
- int i, rc = -ENOENT, lidx, j;
-
- if (the_lnet.ln_rtrpools == NULL)
- return rc;
-
- for (i = 0; i < LNET_NRBPOOLS; i++) {
- lnet_rtrbufpool_t *rbp;
-
- lnet_net_lock(LNET_LOCK_EX);
- lidx = idx;
- cfs_percpt_for_each(rbp, j, the_lnet.ln_rtrpools) {
- if (lidx-- == 0) {
- rc = 0;
- pool_cfg->pl_pools[i].pl_npages =
- rbp[i].rbp_npages;
- pool_cfg->pl_pools[i].pl_nbuffers =
- rbp[i].rbp_nbuffers;
- pool_cfg->pl_pools[i].pl_credits =
- rbp[i].rbp_credits;
- pool_cfg->pl_pools[i].pl_mincredits =
- rbp[i].rbp_mincredits;
- break;
- }
- }
- lnet_net_unlock(LNET_LOCK_EX);
- }
-
- lnet_net_lock(LNET_LOCK_EX);
- pool_cfg->pl_routing = the_lnet.ln_routing;
- lnet_net_unlock(LNET_LOCK_EX);
-
- return rc;
}
int
-lnet_get_route(int idx, __u32 *net, __u32 *hops,
- lnet_nid_t *gateway, __u32 *alive, __u32 *priority)
+lnet_del_route(__u32 net, lnet_nid_t gw_nid)
{
- struct list_head *e1;
- struct list_head *e2;
- lnet_remotenet_t *rnet;
- lnet_route_t *route;
- int cpt;
- int i;
+ 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;
+ LIST_HEAD(zombies);
+ struct lnet_peer *lp = NULL;
+ int i = 0;
- 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 &&
- !route->lr_downis;
- 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 *rte;
-
- 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(rte, &gw->lp_routes, lr_gwlist) {
- int down = 0;
- int up = 0;
- int i;
-
- if ((gw->lp_ping_feats & LNET_PING_FEAT_RTE_DISABLED) != 0) {
- rte->lr_downis = 1;
- continue;
- }
-
- for (i = 0; i < info->pi_nnis && i < LNET_MAX_RTR_NIS; i++) {
- 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) {
- down++;
- continue;
- }
-
- if (stat->ns_status == LNET_NI_STATUS_UP) {
- if (LNET_NIDNET(nid) == rte->lr_net) {
- up = 1;
- break;
- }
- continue;
- }
-
- CDEBUG(D_NET, "%s: Unexpected status 0x%x\n",
- libcfs_nid2str(gw->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 */
- rte->lr_downis = 0;
- continue;
- }
- /* if @down is zero and this route is single-hop, it means
- * we can't find NI for target network */
- if (down == 0 && rte->lr_hops == 1)
- down = 1;
-
- rte->lr_downis = down;
- }
-}
-
-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;
-
-#ifndef __KERNEL__
- lnet_router_checker();
-#endif
- cfs_pause(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 = 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);
- }
-}
-
-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;
- 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, "Del route: net %s : gw %s\n",
+ libcfs_net2str(net), libcfs_nid2str(gw_nid));
- 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);
+ /* NB Caller may specify either all routes via the given gateway
+ * or a specific route entry actual NIDs) */
- 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;
+ lnet_net_lock(LNET_LOCK_EX);
- id.nid = rtr->lp_nid;
- id.pid = LNET_PID_LUSTRE;
- CDEBUG(D_NET, "Check: %s\n", libcfs_id2str(id));
+ 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);
+ }
- rtr->lp_ping_notsent = 1;
- rtr->lp_ping_timestamp = now;
+ 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;
+ }
- mdh = rcd->rcd_mdh;
+ for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
+ rn_list = &the_lnet.ln_remote_nets_hash[i];
- if (rtr->lp_ping_deadline == 0) {
- rtr->lp_ping_deadline =
- cfs_time_shift(router_ping_timeout);
+ 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);
}
+ }
- lnet_net_unlock(rtr->lp_cpt);
+delete_zombies:
+ /*
+ * check if there are any routes remaining on the gateway
+ * If there are no more routes make sure to set the peer's
+ * lp_disc_net_id to 0 (invalid), in case we add more routes in
+ * the future on that gateway, then we start our discovery process
+ * from scratch
+ */
+ if (lpni) {
+ if (list_empty(&lp->lp_routes))
+ lp->lp_disc_net_id = 0;
+ }
+
+ lnet_net_unlock(LNET_LOCK_EX);
- rc = LNetGet(LNET_NID_ANY, mdh, id, LNET_RESERVED_PORTAL,
- LNET_PROTO_PING_MATCHBITS, 0);
+ 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_lock(rtr->lp_cpt);
- if (rc != 0)
- rtr->lp_ping_notsent = 0; /* no event pending */
- }
+ 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));
+ }
- lnet_peer_decref_locked(rtr);
- return;
+ return 0;
}
-int
-lnet_router_checker_start(void)
+void
+lnet_destroy_routes (void)
{
- int rc;
- int eqsz;
-#ifdef __KERNEL__
- struct task_struct *task;
-#else /* __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;
- 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 = LNET_PID_LUSTRE;
-
- 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_del_route(LNET_NIDNET(LNET_NID_ANY), LNET_NID_ANY);
+}
- lnet_net_unlock(0);
+int lnet_get_rtr_pool_cfg(int cpt, struct lnet_ioctl_pool_cfg *pool_cfg)
+{
+ struct lnet_rtrbufpool *rbp;
+ int i, rc = -ENOENT, j;
- if (nrtr == 0) {
- CDEBUG(D_NET,
- "No router found, not starting router checker\n");
- return 0;
- }
+ if (the_lnet.ln_rtrpools == NULL)
+ return rc;
- /* 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
+ cfs_percpt_for_each(rbp, i, the_lnet.ln_rtrpools) {
+ if (i != cpt)
+ continue;
- 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;
- }
-
-#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__
- task = kthread_run(lnet_router_checker, NULL, "router_checker");
- if (IS_ERR(task)) {
- rc = PTR_ERR(task);
- CERROR("Can't start router checker thread: %d\n", rc);
- /* block until event callback signals exit */
- down(&the_lnet.ln_rc_signal);
- rc = LNetEQFree(the_lnet.ln_rc_eqh);
- LASSERT(rc == 0);
- the_lnet.ln_rc_state = LNET_RC_STATE_SHUTDOWN;
- return -ENOMEM;
+ 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;
}
-#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();
- }
+ lnet_net_lock(LNET_LOCK_EX);
+ pool_cfg->pl_routing = the_lnet.ln_routing;
+ lnet_net_unlock(LNET_LOCK_EX);
- return 0;
+ return rc;
}
-void
-lnet_router_checker_stop (void)
+int
+lnet_get_route(int idx, __u32 *net, __u32 *hops,
+ lnet_nid_t *gateway, __u32 *alive, __u32 *priority, __u32 *sensitivity)
{
- int rc;
+ 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;
- if (the_lnet.ln_rc_state == LNET_RC_STATE_SHUTDOWN)
- return;
+ cpt = lnet_net_lock_current();
- LASSERT (the_lnet.ln_rc_state == LNET_RC_STATE_RUNNING);
- the_lnet.ln_rc_state = LNET_RC_STATE_STOPPING;
- /* wakeup the RC thread if it's sleeping */
- wake_up(&the_lnet.ln_rc_waitq);
+ 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, struct lnet_remotenet, lrn_list);
-#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);
+ 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;
+ *sensitivity = route->lr_gateway->
+ lp_health_sensitivity;
+ *alive = lnet_is_route_alive(route);
+ lnet_net_unlock(cpt);
+ return 0;
+ }
+ }
+ }
+ }
- rc = LNetEQFree(the_lnet.ln_rc_eqh);
- LASSERT (rc == 0);
- return;
+ lnet_net_unlock(cpt);
+ return -ENOENT;
}
static void
-lnet_prune_rc_data(int wait_unlink)
+lnet_wait_known_routerstate(void)
{
- 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;
+ struct lnet_peer *rtr;
+ struct list_head *entry;
+ int all_known;
- INIT_LIST_HEAD(&head);
+ LASSERT(the_lnet.ln_mt_state == LNET_MT_STATE_RUNNING);
- lnet_net_lock(LNET_LOCK_EX);
+ for (;;) {
+ int cpt = lnet_net_lock_current();
- 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;
+ all_known = 1;
+ list_for_each(entry, &the_lnet.ln_routers) {
+ rtr = list_entry(entry, struct lnet_peer,
+ lp_rtr_list);
- LASSERT(list_empty(&lp->lp_rcd->rcd_list));
- list_add(&lp->lp_rcd->rcd_list,
- &the_lnet.ln_rcd_deathrow);
- lp->lp_rcd = NULL;
- }
- }
+ spin_lock(&rtr->lp_lock);
- /* unlink all RCDs on deathrow list */
- list_splice_init(&the_lnet.ln_rcd_deathrow, &head);
+ if ((rtr->lp_state & LNET_PEER_RTR_DISCOVERED) == 0) {
+ all_known = 0;
+ spin_unlock(&rtr->lp_lock);
+ break;
+ }
+ spin_unlock(&rtr->lp_lock);
+ }
- if (!list_empty(&head)) {
- lnet_net_unlock(LNET_LOCK_EX);
+ lnet_net_unlock(cpt);
- list_for_each_entry(rcd, &head, rcd_list)
- LNetMDUnlink(rcd->rcd_mdh);
+ if (all_known)
+ return;
- lnet_net_lock(LNET_LOCK_EX);
+ schedule_timeout_uninterruptible(cfs_time_seconds(1));
}
+}
- list_splice_init(&head, &the_lnet.ln_rcd_zombie);
+static inline bool
+lnet_net_set_status_locked(struct lnet_net *net, __u32 status)
+{
+ struct lnet_ni *ni;
+ bool update = false;
- /* 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);
+ 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);
+ }
- wait_unlink = wait_unlink &&
- !list_empty(&the_lnet.ln_rcd_zombie);
+ return update;
+}
- lnet_net_unlock(LNET_LOCK_EX);
+static bool
+lnet_update_ni_status_locked(void)
+{
+ struct lnet_net *net;
+ bool push = false;
+ time64_t now;
+ time64_t timeout;
- 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);
- }
+ LASSERT(the_lnet.ln_routing);
- if (!wait_unlink)
- return;
+ timeout = router_ping_timeout + alive_router_check_interval;
+
+ now = ktime_get_real_seconds();
+ list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
+ if (net->net_lnd->lnd_type == LOLND)
+ continue;
- i++;
- CDEBUG(((i & (-i)) == i) ? D_WARNING : D_NET,
- "Waiting for rc buffers to unlink\n");
- cfs_pause(cfs_time_seconds(1) / 4);
+ if (now < net->net_last_alive + timeout)
+ continue;
- lnet_net_lock(LNET_LOCK_EX);
+ spin_lock(&net->net_lock);
+ /* re-check with lock */
+ if (now < net->net_last_alive + timeout) {
+ spin_unlock(&net->net_lock);
+ continue;
+ }
+ 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);
}
- lnet_net_unlock(LNET_LOCK_EX);
+ return push;
}
-
-#if defined(__KERNEL__) && defined(LNET_ROUTER)
+void lnet_wait_router_start(void)
+{
+ if (check_routers_before_use) {
+ /* Note that a helpful side-effect of pinging all known routers
+ * at startup is that it makes them drop stale connections they
+ * may have to a previous instance of me. */
+ lnet_wait_known_routerstate();
+ }
+}
/*
- * This function is called to check if the RC should block indefinitely.
- * It's called from lnet_router_checker() as well as being passed to
- * wait_event_interruptible() to avoid the lost wake_up problem.
- *
- * When it's called from wait_event_interruptible() it is necessary to
- * also not sleep if the rc state is not running to avoid a deadlock
- * when the system is shutting down
+ * This function is called from the monitor thread to check if there are
+ * any active routers that need to be checked.
*/
-static inline bool
+inline bool
lnet_router_checker_active(void)
{
- if (the_lnet.ln_rc_state != LNET_RC_STATE_RUNNING)
- return true;
-
/* Router Checker thread needs to run when routing is enabled in
* order to call lnet_update_ni_status_locked() */
if (the_lnet.ln_routing)
return true;
return !list_empty(&the_lnet.ln_routers) &&
- (live_router_check_interval > 0 ||
- dead_router_check_interval > 0);
+ alive_router_check_interval > 0;
}
-static int
-lnet_router_checker(void *arg)
+void
+lnet_check_routers(void)
{
- 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;
+ 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;
- cpt = lnet_net_lock_current();
+ cpt = lnet_net_lock_current();
rescan:
- version = the_lnet.ln_routers_version;
+ 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;
+ 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;
+ }
- lnet_ping_router_locked(rtr);
-
- /* NB dropped lock */
- if (version != the_lnet.ln_routers_version) {
- /* the routers list has changed */
- goto rescan;
- }
+ 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;
+ }
+ /* 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 (the_lnet.ln_routing)
- lnet_update_ni_status_locked();
+ /* specify the net to use */
+ rtr->lp_disc_net_id = lpn->lpn_net_id;
- lnet_net_unlock(cpt);
+ /* 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_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. */
- /* if there are any routes then wakeup every second. If
- * there are no routes then sleep indefinitely until woken
- * up by a user adding a route */
- if (!lnet_router_checker_active())
- wait_event_interruptible(the_lnet.ln_rc_waitq,
- lnet_router_checker_active());
+ /* decrement ref count acquired by find_peer_ni_locked() */
+ lnet_peer_ni_decref_locked(lpni);
+
+ if (!rc)
+ lpn->lpn_rtrcheck_timestamp = now;
else
- wait_event_interruptible_timeout(the_lnet.ln_rc_waitq,
- false,
- cfs_time_seconds(1));
+ CERROR("Failed to discover router %s\n",
+ libcfs_nid2str(rtr->lp_primary_nid));
+
+ /* 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);
}
-static 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]);
+ int npages = rbp->rbp_npages;
+ int sz = offsetof(struct lnet_rtrbuf, rb_kiov[npages]);
struct page *page;
- lnet_rtrbuf_t *rb;
- int i;
+ struct lnet_rtrbuf *rb;
+ int i;
LIBCFS_CPT_ALLOC(rb, lnet_cpt_table(), cpt, sz);
if (rb == NULL)
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;
}
static void
-lnet_rtrpool_free_bufs(lnet_rtrbufpool_t *rbp, int cpt)
+lnet_rtrpool_free_bufs(struct lnet_rtrbufpool *rbp, int cpt)
{
- int npages = rbp->rbp_npages;
- lnet_rtrbuf_t *rb;
- struct list_head tmp;
+ int npages = rbp->rbp_npages;
+ struct lnet_rtrbuf *rb;
+ LIST_HEAD(tmp);
if (rbp->rbp_nbuffers == 0) /* not initialized or already freed */
return;
- INIT_LIST_HEAD(&tmp);
-
lnet_net_lock(cpt);
- lnet_drop_routed_msgs_locked(&rbp->rbp_msgs, cpt);
+ list_splice_init(&rbp->rbp_msgs, &tmp);
+ lnet_drop_routed_msgs_locked(&tmp, cpt);
list_splice_init(&rbp->rbp_bufs, &tmp);
+ rbp->rbp_req_nbuffers = 0;
rbp->rbp_nbuffers = rbp->rbp_credits = 0;
rbp->rbp_mincredits = 0;
lnet_net_unlock(cpt);
/* Free buffers on the free list. */
while (!list_empty(&tmp)) {
- rb = list_entry(tmp.next, lnet_rtrbuf_t, rb_list);
+ rb = list_entry(tmp.next, struct lnet_rtrbuf, rb_list);
list_del(&rb->rb_list);
lnet_destroy_rtrbuf(rb, npages);
}
}
static int
-lnet_rtrpool_adjust_bufs(lnet_rtrbufpool_t *rbp, int nbufs, int cpt)
+lnet_rtrpool_adjust_bufs(struct lnet_rtrbufpool *rbp, int nbufs, int cpt)
{
- struct list_head rb_list;
- lnet_rtrbuf_t *rb;
+ LIST_HEAD(rb_list);
+ struct lnet_rtrbuf *rb;
int num_rb;
int num_buffers = 0;
+ int old_req_nbufs;
int npages = rbp->rbp_npages;
+ lnet_net_lock(cpt);
/* If we are called for less buffers than already in the pool, we
- * just lower the nbuffers number and excess buffers will be
+ * 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 (nbufs <= rbp->rbp_nbuffers) {
- lnet_net_lock(cpt);
- rbp->rbp_nbuffers = nbufs;
+ * then get adjusted as well.
+ * If we already have enough buffers allocated to serve the
+ * increase requested, then we can treat that the same way as we
+ * do the decrease. */
+ num_rb = nbufs - rbp->rbp_nbuffers;
+ if (nbufs <= rbp->rbp_req_nbuffers || num_rb <= 0) {
+ rbp->rbp_req_nbuffers = nbufs;
lnet_net_unlock(cpt);
return 0;
}
+ /* store the older value of rbp_req_nbuffers and then set it to
+ * the new request to prevent lnet_return_rx_credits_locked() from
+ * freeing buffers that we need to keep around */
+ old_req_nbufs = rbp->rbp_req_nbuffers;
+ rbp->rbp_req_nbuffers = nbufs;
+ lnet_net_unlock(cpt);
- INIT_LIST_HEAD(&rb_list);
-
- /* allocate the buffers on a local list first. If all buffers are
+ /* 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. */
- num_rb = rbp->rbp_nbuffers;
-
- while (num_rb < nbufs) {
+ while (num_rb-- > 0) {
rb = lnet_new_rtrbuf(rbp, cpt);
if (rb == NULL) {
CERROR("Failed to allocate %d route bufs of %d pages\n",
nbufs, npages);
+
+ lnet_net_lock(cpt);
+ rbp->rbp_req_nbuffers = old_req_nbufs;
+ lnet_net_unlock(cpt);
+
goto failed;
}
list_add(&rb->rb_list, &rb_list);
num_buffers++;
- num_rb++;
}
lnet_net_lock(cpt);
failed:
while (!list_empty(&rb_list)) {
- rb = list_entry(rb_list.next, lnet_rtrbuf_t, rb_list);
+ rb = list_entry(rb_list.next, struct lnet_rtrbuf, rb_list);
list_del(&rb->rb_list);
lnet_destroy_rtrbuf(rb, npages);
}
}
static void
-lnet_rtrpool_init(lnet_rtrbufpool_t *rbp, int npages)
+lnet_rtrpool_init(struct lnet_rtrbufpool *rbp, int npages)
{
INIT_LIST_HEAD(&rbp->rbp_msgs);
INIT_LIST_HEAD(&rbp->rbp_bufs);
- rbp->rbp_npages = npages;
- rbp->rbp_credits = 0;
- rbp->rbp_mincredits = 0;
+ rbp->rbp_npages = npages;
+ rbp->rbp_credits = 0;
+ rbp->rbp_mincredits = 0;
}
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 */
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)
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)
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)
int
lnet_rtrpools_alloc(int im_a_router)
{
- lnet_rtrbufpool_t *rtrp;
+ struct lnet_rtrbufpool *rtrp;
int nrb_tiny;
int nrb_small;
int nrb_large;
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");
lnet_net_lock(LNET_LOCK_EX);
the_lnet.ln_routing = 1;
lnet_net_unlock(LNET_LOCK_EX);
+ complete(&the_lnet.ln_mt_wait_complete);
return 0;
failed:
int nrb = 0;
int rc = 0;
int i;
- lnet_rtrbufpool_t *rtrp;
+ struct lnet_rtrbufpool *rtrp;
/* If the provided values for each buffer pool are different than the
* configured values, we need to take action. */
int
lnet_rtrpools_enable(void)
{
- int rc;
+ int rc = 0;
if (the_lnet.ln_routing)
return 0;
* standard buffer pool allocation routine as
* if we are just configuring this for the first
* time. */
- return lnet_rtrpools_alloc(1);
-
- rc = lnet_rtrpools_adjust_helper(0, 0, 0);
+ rc = lnet_rtrpools_alloc(1);
+ else
+ rc = lnet_rtrpools_adjust_helper(0, 0, 0);
if (rc != 0)
return rc;
lnet_net_lock(LNET_LOCK_EX);
the_lnet.ln_routing = 1;
- the_lnet.ln_ping_info->pi_features &= ~LNET_PING_FEAT_RTE_DISABLED;
+ the_lnet.ln_ping_target->pb_info.pi_features &=
+ ~LNET_PING_FEAT_RTE_DISABLED;
lnet_net_unlock(LNET_LOCK_EX);
- return 0;
+ if (lnet_peer_discovery_disabled)
+ CWARN("Consider turning discovery on to enable full "
+ "Multi-Rail routing functionality\n");
+
+ return rc;
}
void
lnet_net_lock(LNET_LOCK_EX);
the_lnet.ln_routing = 0;
- the_lnet.ln_ping_info->pi_features |= LNET_PING_FEAT_RTE_DISABLED;
+ the_lnet.ln_ping_target->pb_info.pi_features |=
+ LNET_PING_FEAT_RTE_DISABLED;
tiny_router_buffers = 0;
small_router_buffers = 0;
lnet_rtrpools_free(1);
}
+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);
+}
+
+/*
+ * 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(lnet_ni_t *ni, lnet_nid_t nid, int alive, cfs_time_t when)
+lnet_notify(struct lnet_ni *ni, lnet_nid_t nid, bool alive, bool reset,
+ time64_t when)
{
- struct lnet_peer *lp = NULL;
- cfs_time_t now = cfs_time_current();
- int cpt = lnet_cpt_of_nid(nid);
+ struct lnet_peer_ni *lpni = NULL;
+ struct lnet_route *route;
+ struct lnet_peer *lp;
+ time64_t now = ktime_get_seconds();
+ int cpt;
LASSERT (!in_interrupt ());
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;
+ 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;
}
- 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);
-
- if (ni != NULL)
- 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);
+ /* 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(LNET_CPT_NUMBER == 1);
+ 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);
- 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);
+ if (the_lnet.ln_state != LNET_STATE_RUNNING) {
+ lnet_net_unlock(0);
+ return -ESHUTDOWN;
+ }
- lnet_net_lock(0);
+ 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;
+ }
- 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);
+ 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);
}
+ /* recalculate aliveness */
+ alive = lnet_is_peer_ni_alive(lpni);
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);
+ if (ni != NULL && !alive)
+ lnet_notify_peer_down(ni, lpni->lpni_nid);
- 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(int keep_pools)
-{
-}
+ cpt = lpni->lpni_cpt;
+ lnet_net_lock(cpt);
+ lnet_peer_ni_decref_locked(lpni);
+ if (lpni && lpni->lpni_peer_net && lpni->lpni_peer_net->lpn_peer) {
+ lp = lpni->lpni_peer_net->lpn_peer;
+ lp->lp_alive = alive;
+ list_for_each_entry(route, &lp->lp_routes, lr_gwlist)
+ lnet_set_route_aliveness(route, alive);
+ }
+ lnet_net_unlock(cpt);
-int
-lnet_rtrpools_alloc(int im_a_arouter)
-{
- return 0;
+ return 0;
}
-
-#endif
+EXPORT_SYMBOL(lnet_notify);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff