#define LNET_NRB_LARGE_PAGES ((LNET_MTU + PAGE_SIZE - 1) >> \
PAGE_SHIFT)
+extern unsigned int lnet_current_net_count;
+
static char *forwarding = "";
module_param(forwarding, charp, 0444);
MODULE_PARM_DESC(forwarding, "Explicitly enable/disable forwarding between networks");
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)");
bool route_alive;
/*
+ * 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_peer_discovery_disabled)
+ return route->lr_alive;
+
+ /*
* check the gateway's interfaces on the route rnet to make sure
* that the gateway is viable.
*/
}
+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;
+ spin_unlock(&lp->lp_lock);
+
+ /* only handle replies if discovery is disabled. */
+ if (!lnet_peer_discovery_disabled)
+ return;
+
+ if (lp_state & LNET_PEER_PING_FAILED) {
+ CDEBUG(D_NET,
+ "Ping failed with %d. Set routes down for gw %s\n",
+ lp->lp_ping_error, libcfs_nid2str(lp->lp_primary_nid));
+ /* If the ping failed 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;
+
+ /* gateway has the routing feature disabled */
+ if (pbuf->pb_info.pi_features &
+ LNET_PING_FEAT_RTE_DISABLED) {
+ lnet_set_route_aliveness(route, false);
+ 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;
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
static void
lnet_add_route_to_rnet(struct lnet_remotenet *rnet, struct lnet_route *route)
{
- unsigned int len = 0;
+ struct lnet_peer_net *lpn;
unsigned int offset = 0;
+ unsigned int len = 0;
struct list_head *e;
lnet_shuffle_seed();
* different nodes are using the same list of routers, they end up
* preferring different routers.
*/
- offset = cfs_rand() % (len + 1);
+ offset = prandom_u32_max(len + 1);
list_for_each(e, &rnet->lrn_routes) {
if (offset == 0)
break;
* force a router check on the gateway to make sure the route is
* alive
*/
- route->lr_gateway->lp_rtrcheck_timestamp = 0;
+ 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++;
int
lnet_add_route(__u32 net, __u32 hops, lnet_nid_t gateway,
- unsigned int priority)
+ __u32 priority, __u32 sensitivity)
{
struct list_head *route_entry;
struct lnet_remotenet *rnet;
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));
* to move the routes from the peer that's being deleted to the
* consolidated peer lp_routes list
*/
- if (add_route)
+ if (add_route) {
+ gw->lp_health_sensitivity = sensitivity;
lnet_add_route_to_rnet(rnet2, route);
+ if (lnet_peer_discovery_disabled)
+ CWARN("Consider turning discovery on to enable full "
+ "Multi-Rail routing functionality\n");
+ }
/*
* get rid of the reference on the lpni.
LIBCFS_FREE(rnet, sizeof(*rnet));
/* kick start the monitor thread to handle the added route */
- wake_up(&the_lnet.ln_mt_waitq);
+ complete(&the_lnet.ln_mt_wait_complete);
return rc;
}
}
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);
while (!list_empty(&zombies)) {
int
lnet_get_route(int idx, __u32 *net, __u32 *hops,
- lnet_nid_t *gateway, __u32 *alive, __u32 *priority)
+ lnet_nid_t *gateway, __u32 *alive, __u32 *priority, __u32 *sensitivity)
{
- struct list_head *e1;
- struct list_head *e2;
struct lnet_remotenet *rnet;
- struct lnet_route *route;
- int cpt;
- int i;
struct list_head *rn_list;
+ struct lnet_route *route;
+ struct list_head *e1;
+ struct list_head *e2;
+ int cpt;
+ int i;
cpt = lnet_net_lock_current();
*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;
}
}
-static void
+static inline bool
+lnet_net_set_status_locked(struct lnet_net *net, __u32 status)
+{
+ struct lnet_ni *ni;
+ bool update = false;
+
+ 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);
+ }
+
+ return update;
+}
+
+static bool
lnet_update_ni_status_locked(void)
{
- struct lnet_ni *ni = NULL;
+ struct lnet_net *net;
+ bool push = false;
time64_t now;
time64_t timeout;
timeout = router_ping_timeout + alive_router_check_interval;
now = ktime_get_real_seconds();
- while ((ni = lnet_get_next_ni_locked(NULL, ni))) {
- if (ni->ni_net->net_lnd->lnd_type == LOLND)
+ list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
+ if (net->net_lnd->lnd_type == LOLND)
continue;
- if (now < ni->ni_last_alive + timeout)
+ if (now < net->net_last_alive + timeout)
continue;
- lnet_ni_lock(ni);
+ spin_lock(&net->net_lock);
/* re-check with lock */
- if (now < ni->ni_last_alive + timeout) {
- lnet_ni_unlock(ni);
+ if (now < net->net_last_alive + timeout) {
+ spin_unlock(&net->net_lock);
continue;
}
+ spin_unlock(&net->net_lock);
- LASSERT(ni->ni_status != NULL);
-
- if (ni->ni_status->ns_status != LNET_NI_STATUS_DOWN) {
- CDEBUG(D_NET, "NI(%s:%lld) 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);
+ /*
+ * 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);
}
+
+ return push;
}
void lnet_wait_router_start(void)
void
lnet_check_routers(void)
{
+ 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;
* interfaces could be down and in that case they would be
* undergoing recovery separately from this discovery.
*/
- if (now - rtr->lp_rtrcheck_timestamp <
- alive_router_check_interval)
+ /* 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;
+ }
+
+ if (now - lpn->lpn_rtrcheck_timestamp <
+ alive_router_check_interval / lnet_current_net_count)
continue;
/*
}
lnet_peer_ni_addref_locked(lpni);
+ /* specify the net to use */
+ rtr->lp_disc_net_id = lpn->lpn_net_id;
+
/* discover the router */
CDEBUG(D_NET, "discover %s, cpt = %d\n",
libcfs_nid2str(lpni->lpni_nid), cpt);
lnet_peer_ni_decref_locked(lpni);
if (!rc)
- rtr->lp_rtrcheck_timestamp = now;
+ lpn->lpn_rtrcheck_timestamp = now;
else
CERROR("Failed to discover router %s\n",
libcfs_nid2str(rtr->lp_primary_nid));
}
if (the_lnet.ln_routing)
- lnet_update_ni_status_locked();
+ push = lnet_update_ni_status_locked();
lnet_net_unlock(cpt);
+
+ /* if the status of the ni changed update the peers */
+ if (push)
+ lnet_push_update_to_peers(1);
}
void
lnet_net_lock(LNET_LOCK_EX);
the_lnet.ln_routing = 1;
lnet_net_unlock(LNET_LOCK_EX);
- wake_up(&the_lnet.ln_mt_waitq);
+ complete(&the_lnet.ln_mt_wait_complete);
return 0;
failed:
~LNET_PING_FEAT_RTE_DISABLED;
lnet_net_unlock(LNET_LOCK_EX);
+ if (lnet_peer_discovery_disabled)
+ CWARN("Consider turning discovery on to enable full "
+ "Multi-Rail routing functionality\n");
+
return rc;
}
time64_t when)
{
struct lnet_peer_ni *lpni = NULL;
+ struct lnet_route *route;
+ struct lnet_peer *lp;
time64_t now = ktime_get_seconds();
int cpt;
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;
+ list_for_each_entry(route, &lp->lp_routes, lr_gwlist)
+ lnet_set_route_aliveness(route, alive);
+ }
lnet_net_unlock(cpt);
return 0;