Viewing: router.c
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
*
* Copyright (c) 2011, 2017, Intel Corporation.
*/
/* This file is part of Lustre, http://www.lustre.org/ */
#define DEBUG_SUBSYSTEM S_LNET
#include <linux/random.h>
#include <linux/libcfs/libcfs.h>
#include <linux/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_MIN 4096 /* min value for each CPT */
#define LNET_NRB_SMALL (LNET_NRB_SMALL_MIN * 4)
#define LNET_NRB_SMALL_PAGES 1
#define LNET_NRB_LARGE_MIN 256 /* min value for each CPT */
#define LNET_NRB_LARGE (LNET_NRB_LARGE_MIN * 4)
#define LNET_NRB_LARGE_PAGES ((LNET_MTU + PAGE_SIZE - 1) >> \
PAGE_SHIFT)
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(struct lnet_net *net)
{
/* 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;
}
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, const struct kernel_param *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)
module_param(router_sensitivity_percentage, rtr_sensitivity, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(router_sensitivity_percentage,
"(Deprecated) How healthy a gateway should be to be used in percent");
static void lnet_add_route_to_rnet(struct lnet_remotenet *rnet,
struct lnet_route *route);
static void lnet_del_route_from_rnet(struct lnet_nid *gw_nid,
struct list_head *route_list,
struct list_head *zombies);
static int
rtr_sensitivity_set(const char *val, const struct kernel_param *kp)
{
int rc;
unsigned *sen = (unsigned *)kp->arg;
unsigned long value;
rc = kstrtoul(val, 0, &value);
if (rc) {
CERROR("Invalid module parameter value for 'router_sensitivity_percentage'\n");
return rc;
}
if (value < 0 || value > 100) {
CERROR("Invalid value: %lu for 'router_sensitivity_percentage'\n", value);
return -EINVAL;
}
/*
* 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);
*sen = value;
mutex_unlock(&the_lnet.ln_api_mutex);
return 0;
}
void
lnet_move_route(struct lnet_route *route, struct lnet_peer *lp,
struct list_head *rt_list)
__must_hold(&the_lnet.ln_api_mutex)
{
struct lnet_remotenet *rnet;
struct list_head zombies;
struct list_head *l;
INIT_LIST_HEAD(&zombies);
if (rt_list)
l = rt_list;
else
l = &zombies;
rnet = lnet_find_rnet_locked(route->lr_net);
LASSERT(rnet);
CDEBUG(D_NET, "deleting route %s->%s\n",
libcfs_net2str(route->lr_net),
libcfs_nidstr(&route->lr_nid));
/*
* use the gateway's lp_primary_nid to delete the route as the
* lr_nid can be a constituent NID of the peer
*/
lnet_del_route_from_rnet(
&route->lr_gateway->lp_primary_nid,
&rnet->lrn_routes, l);
if (lp) {
route = list_first_entry(l, struct lnet_route,
lr_list);
route->lr_gateway = lp;
lnet_add_route_to_rnet(rnet, route);
} else {
while (!list_empty(l) && !rt_list) {
route = list_first_entry(l, struct lnet_route,
lr_list);
list_del(&route->lr_list);
LIBCFS_FREE(route, sizeof(*route));
}
}
}
void
lnet_rtr_transfer_to_peer(struct lnet_peer *src, struct lnet_peer *target)
{
struct lnet_route *route;
struct lnet_route *tmp, *tmp2;
lnet_net_lock(LNET_LOCK_EX);
CDEBUG(D_NET, "transfering routes from %s -> %s\n",
libcfs_nidstr(&src->lp_primary_nid),
libcfs_nidstr(&target->lp_primary_nid));
list_for_each_entry(route, &src->lp_routes, lr_gwlist) {
CDEBUG(D_NET, "%s: %s->%s\n",
libcfs_nidstr(&src->lp_primary_nid),
libcfs_net2str(route->lr_net),
libcfs_nidstr(&route->lr_nid));
}
list_splice_init(&src->lp_rtrq, &target->lp_rtrq);
list_for_each_entry_safe(route, tmp, &src->lp_routes, lr_gwlist) {
struct lnet_route *r2;
bool present = false;
list_for_each_entry_safe(r2, tmp2, &target->lp_routes, lr_gwlist) {
if (route->lr_net == r2->lr_net) {
if (route->lr_priority >= r2->lr_priority)
present = true;
else if (route->lr_hops >= r2->lr_hops)
present = true;
else
lnet_move_route(r2, NULL, NULL);
}
}
if (present)
lnet_move_route(route, NULL, NULL);
else
lnet_move_route(route, target, NULL);
}
if (list_empty(&target->lp_rtr_list)) {
lnet_peer_addref_locked(target);
list_add_tail(&target->lp_rtr_list, &the_lnet.ln_routers);
}
the_lnet.ln_routers_version++;
lnet_net_unlock(LNET_LOCK_EX);
}
int
lnet_peers_start_down(void)
{
return check_routers_before_use;
}
/*
* 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)
{
struct lnet_peer_ni *lpni;
list_for_each_entry(lpni, &lpn->lpn_peer_nis, lpni_peer_nis) {
if (lnet_is_peer_ni_alive(lpni))
return true;
}
return false;
}
/*
* a gateway is alive only if all its nets are alive
* called with cpt lock held
*/
bool lnet_is_gateway_alive(struct lnet_peer *gw)
{
struct lnet_peer_net *lpn;
if (!gw->lp_alive)
return false;
list_for_each_entry(lpn, &gw->lp_peer_nets, lpn_peer_nets) {
if (!lnet_is_gateway_net_alive(lpn))
return false;
}
return true;
}
/*
* 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 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 atomic_read(&route->lr_alive) == 1;
/*
* 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;
/*
* For single hop routes avoid_asym_router_failure dictates
* that the remote net must exist on the gateway. For multi-hop
* routes the next-hop will not have the remote net.
*/
if (avoid_asym_router_failure &&
(route->lr_hops == 1 || route->lr_single_hop)) {
rlpn = lnet_peer_get_net_locked(gw, route->lr_net);
if (!rlpn)
return false;
if (!lnet_is_gateway_net_alive(rlpn))
return false;
}
spin_lock(&gw->lp_lock);
if (!(gw->lp_state & LNET_PEER_ROUTER_ENABLED)) {
spin_unlock(&gw->lp_lock);
return false;
}
spin_unlock(&gw->lp_lock);
return true;
}
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_ni_get_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);
}
}
}
static inline void
lnet_check_route_inconsistency(struct lnet_route *route)
{
if (!route->lr_single_hop && route->lr_hops == 1 &&
avoid_asym_router_failure) {
CWARN("route %s->%s is detected to be multi-hop but hop count is set to %d\n",
libcfs_net2str(route->lr_net),
libcfs_nidstr(&route->lr_gateway->lp_primary_nid),
(int) route->lr_hops);
}
}
/* Routes are added and removed under both ln_api_mutex and net_lock/EX
* Since we are not modifying anything we simply require the ln_api_mutex be
* held so that things are not modified underneath us
*/
void
lnet_router_discovery_ping_reply(struct lnet_peer *lp,
struct lnet_ping_buffer *pbuf)
__must_hold(&the_lnet.ln_api_mutex)
{
struct lnet_ping_iter piter;
struct lnet_peer_net *llpn;
struct lnet_route *route;
struct lnet_nid nid;
bool single_hop = false;
bool net_up = false;
u32 *stp;
if (pbuf->pb_info.pi_features & LNET_PING_FEAT_RTE_DISABLED) {
CERROR("Peer %s is being used as a gateway but routing feature is not turned on\n",
libcfs_nidstr(&lp->lp_primary_nid));
list_for_each_entry(route, &lp->lp_routes, lr_gwlist)
lnet_set_route_aliveness(route, false);
return;
}
CDEBUG(D_NET, "Processing reply for gw: %s nnis %d\n",
libcfs_nidstr(&lp->lp_primary_nid), pbuf->pb_info.pi_nnis);
/* examine the ping response to determine if the routes on that
* gateway should be declared alive.
* The route is alive if:
* 1. local network to reach the route is alive and
* 2. route is single hop, avoid_async_router_failure is set and
* there exists at least one NI on the route's remote net
*/
list_for_each_entry(route, &lp->lp_routes, lr_gwlist) {
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;
}
single_hop = net_up = false;
for (stp = ping_iter_first(&piter, pbuf, &nid);
stp;
stp = ping_iter_next(&piter, &nid)) {
if (route->lr_net == LNET_NID_NET(&nid)) {
single_hop = true;
if (*stp == LNET_NI_STATUS_UP) {
net_up = true;
break;
}
}
}
route->lr_single_hop = single_hop;
if (avoid_asym_router_failure &&
(route->lr_hops == 1 || route->lr_single_hop))
lnet_set_route_aliveness(route, net_up);
else
lnet_set_route_aliveness(route, true);
/*
* warn that the route is configured as single-hop but it
* really is multi-hop as far as we can tell.
*/
lnet_check_route_inconsistency(route);
}
}
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);
if (!lp->lp_dc_error)
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_nidstr(&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(struct lnet_peer *lp)
{
LASSERT(lp->lp_rtr_refcount >= 0);
/* lnet_net_lock must be exclusively locked */
lp->lp_rtr_refcount++;
if (lp->lp_rtr_refcount == 1) {
list_add_tail(&lp->lp_rtr_list, &the_lnet.ln_routers);
/* addref for the_lnet.ln_routers */
lnet_peer_addref_locked(lp);
the_lnet.ln_routers_version++;
}
}
static void
lnet_rtr_decref_locked(struct lnet_peer *lp)
{
LASSERT(atomic_read(&lp->lp_refcount) > 0);
LASSERT(lp->lp_rtr_refcount > 0);
/* lnet_net_lock must be exclusively locked */
lp->lp_rtr_refcount--;
if (lp->lp_rtr_refcount == 0) {
LASSERT(list_empty(&lp->lp_routes));
list_del(&lp->lp_rtr_list);
/* decref for the_lnet.ln_routers */
lnet_peer_decref_locked(lp);
the_lnet.ln_routers_version++;
}
}
struct lnet_remotenet *
lnet_find_rnet_locked(__u32 net)
{
struct lnet_remotenet *rnet;
struct list_head *rn_list;
LASSERT(the_lnet.ln_state == LNET_STATE_RUNNING);
rn_list = lnet_net2rnethash(net);
list_for_each_entry(rnet, rn_list, lrn_list) {
if (rnet->lrn_net == net)
return rnet;
}
return NULL;
}
static void lnet_shuffle_seed(void)
{
static int seeded;
struct lnet_ni *ni = NULL;
if (seeded)
return;
/* Nodes with small feet have little entropy
* the NID for this node gives the most entropy in the low bits */
while ((ni = lnet_get_next_ni_locked(NULL, ni)))
add_device_randomness(&ni->ni_nid, sizeof(ni->ni_nid));
seeded = 1;
}
/* NB expects LNET_LOCK held */
static void
lnet_add_route_to_rnet(struct lnet_remotenet *rnet, struct lnet_route *route)
{
struct lnet_peer_net *lpn;
unsigned int offset = 0;
unsigned int len = 0;
struct list_head *e;
time64_t now;
lnet_shuffle_seed();
list_for_each(e, &rnet->lrn_routes)
len++;
/*
* Randomly adding routes to the list is done to ensure that when
* different nodes are using the same list of routers, they end up
* preferring different routers.
*/
offset = get_random_u32_below(len + 1);
list_for_each(e, &rnet->lrn_routes) {
if (offset == 0)
break;
offset--;
}
list_add(&route->lr_list, e);
/*
* force a router check on the gateway to make sure the route is
* alive
*/
now = ktime_get_real_seconds();
list_for_each_entry(lpn, &route->lr_gateway->lp_peer_nets,
lpn_peer_nets) {
lpn->lpn_next_ping = now;
}
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, __u32 hops, struct lnet_nid *gateway, __u32 priority)
__must_hold(&the_lnet.ln_api_mutex)
{
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_nidstr(gateway));
if (LNET_NID_IS_ANY(gateway) ||
nid_is_lo0(gateway) ||
net == LNET_NET_ANY ||
LNET_NETTYP(net) == LOLND ||
LNET_NID_NET(gateway) == net ||
(hops != LNET_UNDEFINED_HOPS && (hops < 1 || hops > 255)))
return -EINVAL;
/* it's a local network */
if (lnet_islocalnet(net))
return -EEXIST;
if (!lnet_islocalnet(LNET_NID_NET(gateway))) {
CERROR("Cannot add route with gateway %s. There is no local interface configured on LNet %s\n",
libcfs_nidstr(gateway),
libcfs_net2str(LNET_NID_NET(gateway)));
return -EHOSTUNREACH;
}
/* 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_nidstr(gateway));
LIBCFS_FREE(route, sizeof(*route));
LIBCFS_FREE(rnet, sizeof(*rnet));
return -ENOMEM;
}
INIT_LIST_HEAD(&rnet->lrn_routes);
rnet->lrn_net = net;
/* store the local and remote net that the route represents */
route->lr_lnet = LNET_NID_NET(gateway);
route->lr_net = net;
route->lr_nid = *gateway;
route->lr_priority = priority;
route->lr_hops = hops;
if (lnet_peers_start_down())
atomic_set(&route->lr_alive, 0);
else
atomic_set(&route->lr_alive, 1);
lnet_net_lock(LNET_LOCK_EX);
/*
* lnet_nid2peerni_ex() grabs a ref on the lpni. We will need to
* lose that once we're done
*/
lpni = lnet_nid2peerni_ex(gateway);
if (IS_ERR(lpni)) {
lnet_net_unlock(LNET_LOCK_EX);
LIBCFS_FREE(route, sizeof(*route));
LIBCFS_FREE(rnet, sizeof(*rnet));
rc = PTR_ERR(lpni);
CERROR("Error %d creating route %s %d %s\n", rc,
libcfs_net2str(net), hops,
libcfs_nidstr(gateway));
return rc;
}
LASSERT(lpni);
LASSERT(lpni->lpni_peer_net);
LASSERT(lpni->lpni_peer_net->lpn_peer);
gw = lpni->lpni_peer_net->lpn_peer;
route->lr_gateway = gw;
rnet2 = lnet_find_rnet_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(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(!nid_same(&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_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.
*/
lnet_peer_ni_decref_locked(lpni);
lnet_net_unlock(LNET_LOCK_EX);
/* If avoid_asym_router_failure is enabled and hop count is not
* set to 1 for a route that is actually single-hop, then the
* feature will fail to prevent the router from being selected
* if it is missing a NI on the remote network due to misconfiguration.
*/
if (avoid_asym_router_failure && hops == LNET_UNDEFINED_HOPS)
CWARN("Use hops = 1 for a single-hop route when avoid_asym_router_failure feature is enabled\n");
rc = 0;
if (!add_route) {
rc = -EEXIST;
LIBCFS_FREE(route, sizeof(*route));
}
if (rnet != rnet2)
LIBCFS_FREE(rnet, sizeof(*rnet));
/* kick start the monitor thread to handle the added route */
complete(&the_lnet.ln_mt_wait_complete);
return rc;
}
void
lnet_del_route_from_rnet(struct lnet_nid *gw_nid,
struct list_head *route_list,
struct list_head *zombies)
{
struct lnet_peer *gateway;
struct lnet_route *route;
struct lnet_route *tmp;
list_for_each_entry_safe(route, tmp, route_list, lr_list) {
gateway = route->lr_gateway;
if (gw_nid && !nid_same(gw_nid, &gateway->lp_primary_nid))
continue;
/*
* 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);
}
}
int
lnet_del_route(__u32 net, struct lnet_nid *gw)
__must_hold(&the_lnet.ln_api_mutex)
{
LIST_HEAD(rnet_zombies);
struct lnet_remotenet *rnet;
struct lnet_remotenet *tmp;
struct list_head *rn_list;
struct lnet_peer_ni *lpni;
struct lnet_route *route;
struct lnet_nid gw_nid;
LIST_HEAD(zombies);
struct lnet_peer *lp = NULL;
int i = 0;
CDEBUG(D_NET, "Del route: net %s : gw %s\n",
libcfs_net2str(net), libcfs_nidstr(gw));
/* 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 (gw)
lpni = lnet_peer_ni_find_locked(gw);
else
lpni = NULL;
if (lpni) {
lp = lpni->lpni_peer_net->lpn_peer;
LASSERT(lp);
gw_nid = lp->lp_primary_nid;
gw = &gw_nid;
}
if (net != LNET_NET_ANY) {
rnet = lnet_find_rnet_locked(net);
if (!rnet) {
if (lpni)
lnet_peer_ni_decref_locked(lpni);
lnet_net_unlock(LNET_LOCK_EX);
return -ENOENT;
}
lnet_del_route_from_rnet(gw, &rnet->lrn_routes,
&zombies);
if (list_empty(&rnet->lrn_routes))
list_move(&rnet->lrn_list, &rnet_zombies);
goto delete_zombies;
}
for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
rn_list = &the_lnet.ln_remote_nets_hash[i];
list_for_each_entry_safe(rnet, tmp, rn_list, lrn_list) {
lnet_del_route_from_rnet(gw, &rnet->lrn_routes,
&zombies);
if (list_empty(&rnet->lrn_routes))
list_move(&rnet->lrn_list, &rnet_zombies);
}
}
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_peer_ni_decref_locked(lpni);
}
lnet_net_unlock(LNET_LOCK_EX);
while (!list_empty(&zombies)) {
route = list_first_entry(&zombies, struct lnet_route, lr_list);
list_del(&route->lr_list);
LIBCFS_FREE(route, sizeof(*route));
}
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));
}
return 0;
}
void
lnet_destroy_routes(void)
{
lnet_del_route(LNET_NET_ANY, NULL);
}
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 (the_lnet.ln_rtrpools == NULL)
return rc;
cfs_percpt_for_each(rbp, i, the_lnet.ln_rtrpools) {
if (i != cpt)
continue;
lnet_net_lock(i);
for (j = 0; j < LNET_NRBPOOLS; j++) {
pool_cfg->pl_pools[j].pl_npages = rbp[j].rbp_npages;
pool_cfg->pl_pools[j].pl_nbuffers = rbp[j].rbp_nbuffers;
pool_cfg->pl_pools[j].pl_credits = rbp[j].rbp_credits;
pool_cfg->pl_pools[j].pl_mincredits = rbp[j].rbp_mincredits;
}
lnet_net_unlock(i);
rc = 0;
break;
}
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 *flags, __u32 *priority)
{
struct lnet_remotenet *rnet;
struct list_head *rn_list;
struct lnet_route *route;
int cpt;
int i;
cpt = lnet_net_lock_current();
for (i = 0; i < LNET_REMOTE_NETS_HASH_SIZE; i++) {
rn_list = &the_lnet.ln_remote_nets_hash[i];
list_for_each_entry(rnet, rn_list, lrn_list) {
list_for_each_entry(route, &rnet->lrn_routes, lr_list) {
if (idx-- == 0) {
*net = rnet->lrn_net;
*gateway = lnet_nid_to_nid4(&route->lr_nid);
*hops = route->lr_hops;
*priority = route->lr_priority;
if (lnet_is_route_alive(route))
*flags |= LNET_RT_ALIVE;
else
*flags &= ~LNET_RT_ALIVE;
if (route->lr_single_hop)
*flags &= ~LNET_RT_MULTI_HOP;
else
*flags |= LNET_RT_MULTI_HOP;
lnet_net_unlock(cpt);
return 0;
}
}
}
}
lnet_net_unlock(cpt);
return -ENOENT;
}
static void
lnet_wait_known_routerstate(void)
{
struct lnet_peer *rtr;
int all_known;
LASSERT(the_lnet.ln_mt_state == LNET_MT_STATE_RUNNING);
for (;;) {
int cpt = lnet_net_lock_current();
all_known = 1;
list_for_each_entry(rtr, &the_lnet.ln_routers, lp_rtr_list) {
spin_lock(&rtr->lp_lock);
if ((rtr->lp_state & LNET_PEER_RTR_DISCOVERED) == 0) {
all_known = 0;
spin_unlock(&rtr->lp_lock);
break;
}
spin_unlock(&rtr->lp_lock);
}
lnet_net_unlock(cpt);
if (all_known)
return;
schedule_timeout_uninterruptible(cfs_time_seconds(1));
}
}
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)
if (lnet_ni_set_status(ni, status))
update = true;
return update;
}
static bool
lnet_update_ni_status_locked(void)
{
struct lnet_net *net;
struct lnet_ni *ni;
bool push = false;
time64_t now;
time64_t timeout;
LASSERT(lnet_routing_enabled());
timeout = router_ping_timeout + alive_router_check_interval;
now = ktime_get_seconds();
list_for_each_entry(net, &the_lnet.ln_nets, net_list) {
if (net->net_lnd->lnd_type == LOLND)
continue;
if (now < net->net_last_alive + timeout)
goto check_ni_fatal;
spin_lock(&net->net_lock);
/* re-check with lock */
if (now < net->net_last_alive + timeout) {
spin_unlock(&net->net_lock);
goto check_ni_fatal;
}
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.
*/
if (lnet_net_set_status_locked(net, LNET_NI_STATUS_DOWN)) {
push = true;
continue;
}
check_ni_fatal:
list_for_each_entry(ni, &net->net_ni_list, ni_netlist) {
/* lnet_ni_set_status() will perform the same check of
* ni_status while holding the ni lock. We can safely
* check ni_status without that lock because it is only
* written to under net_lock/EX and our caller is
* holding a net lock.
*/
if (atomic_read(&ni->ni_fatal_error_on) &&
ni->ni_status &&
*ni->ni_status != LNET_NI_STATUS_DOWN &&
lnet_ni_set_status(ni, LNET_NI_STATUS_DOWN))
push = true;
}
}
return push;
}
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 from the monitor thread to check if there are
* any active routers that need to be checked.
*/
bool lnet_router_checker_active(void)
{
/* Router Checker thread needs to run when routing is enabled in
* order to call lnet_update_ni_status_locked() */
if (lnet_routing_enabled())
return true;
return !list_empty(&the_lnet.ln_routers) &&
alive_router_check_interval > 0;
}
static void
lnet_enable_routing(void)
{
lnet_net_lock(LNET_LOCK_EX);
the_lnet.ln_routing = LNET_ROUTING_ENABLED;
the_lnet.ln_ping_target->pb_info.pi_features &=
~LNET_PING_FEAT_RTE_DISABLED;
lnet_net_unlock(LNET_LOCK_EX);
LCONSOLE_INFO("Message forwarding enabled\n");
}
static void
lnet_disable_routing(void)
{
lnet_net_lock(LNET_LOCK_EX);
the_lnet.ln_routing = LNET_ROUTING_DISABLED;
lnet_net_unlock(LNET_LOCK_EX);
lnet_rtrpools_free(1);
LCONSOLE_INFO("Message forwarding disabled\n");
}
static bool
lnet_rtrpools_are_free(time64_t now, int cpt)
{
struct lnet_rtrbufpool *rbp;
int cpt2;
lnet_net_unlock(cpt);
cfs_percpt_for_each(rbp, cpt2, the_lnet.ln_rtrpools) {
lnet_net_lock(cpt2);
if (rbp->rbp_credits < rbp->rbp_nbuffers) {
lnet_net_unlock(cpt2);
lnet_net_lock(cpt);
return false;
}
lnet_net_unlock(cpt2);
}
lnet_net_lock(cpt);
return true;
}
void
lnet_check_routers(void)
{
struct lnet_peer_net *first_lpn;
struct lnet_peer_net *lpn;
struct lnet_peer_ni *lpni;
struct lnet_peer *rtr;
bool push = false;
bool needs_ping;
bool found_lpn;
__u64 version;
__u32 net_id;
time64_t now;
int cpt;
int rc;
static time64_t rtr_min_wait;
static time64_t rtr_max_wait;
cpt = lnet_net_lock_current();
now = ktime_get_real_seconds();
if (the_lnet.ln_routing == LNET_ROUTING_STOPPING ||
the_lnet.ln_routing == LNET_ROUTING_STARTING) {
if (!rtr_min_wait) {
int interval = alive_router_check_interval +
router_ping_timeout;
/* Wait at least alive_router_check_interval +
* router_ping_timeout, and for stopping case
* no more than 3x of these intervals, before
* disabling or enabling routing
*/
rtr_min_wait = now + interval;
rtr_max_wait = now + 3 * interval;
}
if (the_lnet.ln_routing == LNET_ROUTING_STARTING &&
rtr_min_wait < now) {
lnet_net_unlock(cpt);
lnet_enable_routing();
rtr_min_wait = 0;
rtr_max_wait = 0;
push = true;
lnet_net_lock(cpt);
}
if (the_lnet.ln_routing == LNET_ROUTING_STOPPING &&
((rtr_min_wait < now && lnet_rtrpools_are_free(now, cpt)) ||
rtr_max_wait < now)) {
lnet_net_unlock(cpt);
lnet_disable_routing();
rtr_min_wait = 0;
rtr_max_wait = 0;
lnet_net_lock(cpt);
}
}
rescan:
version = the_lnet.ln_routers_version;
list_for_each_entry(rtr, &the_lnet.ln_routers, lp_rtr_list) {
/* If we're currently discovering the peer then don't
* issue another discovery
*/
if (rtr->lp_state & LNET_PEER_RTR_DISCOVERY)
continue;
now = ktime_get_real_seconds();
/* find the next local peer net which needs to be ping'd */
needs_ping = false;
first_lpn = NULL;
found_lpn = false;
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_nidstr(&rtr->lp_primary_nid));
break;
}
/* We looped back to the first peer net */
if (first_lpn == lpn)
break;
if (!first_lpn)
first_lpn = lpn;
net_id = lpn->lpn_net_id;
if (!lnet_islocalnet_locked(net_id))
continue;
found_lpn = true;
CDEBUG(D_NET, "rtr %s(%p) %s(%p) next ping %lld\n",
libcfs_nidstr(&rtr->lp_primary_nid), rtr,
libcfs_net2str(net_id), lpn,
lpn->lpn_next_ping);
needs_ping = now >= lpn->lpn_next_ping;
} while (!needs_ping);
if (!found_lpn || !lpn) {
CERROR("no local network found for gateway %s\n",
libcfs_nidstr(&rtr->lp_primary_nid));
continue;
}
if (!needs_ping)
continue;
spin_lock(&rtr->lp_lock);
/* make sure we fully discover the router */
rtr->lp_state &= ~LNET_PEER_NIDS_UPTODATE;
rtr->lp_state |= LNET_PEER_FORCE_PING | LNET_PEER_FORCE_PUSH |
LNET_PEER_RTR_DISCOVERY;
spin_unlock(&rtr->lp_lock);
/* find the peer_ni associated with the primary NID */
lpni = lnet_peer_ni_get_locked(rtr, &rtr->lp_primary_nid);
if (!lpni) {
CDEBUG(D_NET, "Expected to find an lpni for %s, but non found\n",
libcfs_nidstr(&rtr->lp_primary_nid));
continue;
}
kref_get(&lpni->lpni_kref);
/* 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_nidstr(&lpni->lpni_nid), cpt);
rc = lnet_discover_peer_locked(lpni, cpt, false);
/* drop ref taken above */
lnet_peer_ni_decref_locked(lpni);
if (!rc)
lpn->lpn_next_ping = now + alive_router_check_interval;
else
CERROR("Failed to discover router %s\n",
libcfs_nidstr(&rtr->lp_primary_nid));
/* NB cpt lock was dropped in lnet_discover_peer_locked() */
if (version != the_lnet.ln_routers_version) {
/* the routers list has changed */
goto rescan;
}
}
if (lnet_routing_enabled() && lnet_update_ni_status_locked())
push = true;
lnet_net_unlock(cpt);
/* if the status of the ni changed update the peers */
if (push)
lnet_push_update_to_peers(1);
}
void
lnet_destroy_rtrbuf(struct lnet_rtrbuf *rb, int npages)
{
int sz = offsetof(struct lnet_rtrbuf, rb_kiov[npages]);
while (--npages >= 0)
__free_page(rb->rb_kiov[npages].bv_page);
LIBCFS_FREE(rb, sz);
}
static struct lnet_rtrbuf *
lnet_new_rtrbuf(struct lnet_rtrbufpool *rbp, int cpt)
{
int npages = rbp->rbp_npages;
int sz = offsetof(struct lnet_rtrbuf, rb_kiov[npages]);
struct page *page;
struct lnet_rtrbuf *rb;
int i;
LIBCFS_CPT_ALLOC(rb, lnet_cpt_table(), cpt, sz);
if (rb == NULL)
return NULL;
rb->rb_pool = rbp;
for (i = 0; i < npages; i++) {
page = cfs_page_cpt_alloc(lnet_cpt_table(), cpt, GFP_KERNEL |
__GFP_ZERO | __GFP_NORETRY);
if (page == NULL) {
while (--i >= 0)
__free_page(rb->rb_kiov[i].bv_page);
LIBCFS_FREE(rb, sz);
return NULL;
}
rb->rb_kiov[i].bv_len = PAGE_SIZE;
rb->rb_kiov[i].bv_offset = 0;
rb->rb_kiov[i].bv_page = page;
}
return rb;
}
static void
lnet_rtrpool_free_bufs(struct lnet_rtrbufpool *rbp, int cpt)
{
int npages = rbp->rbp_npages;
struct lnet_rtrbuf *rb;
LIST_HEAD(tmp);
if (rbp->rbp_nbuffers == 0) /* not initialized or already freed */
return;
lnet_net_lock(cpt);
list_splice_init(&rbp->rbp_msgs, &tmp);
lnet_drop_routed_msgs_locked(&tmp, cpt);
list_splice_init(&rbp->rbp_bufs, &tmp);
rbp->rbp_req_nbuffers = 0;
rbp->rbp_nbuffers = rbp->rbp_credits = 0;
rbp->rbp_mincredits = 0;
lnet_net_unlock(cpt);
/* Free buffers on the free list. */
while (!list_empty(&tmp)) {
rb = list_first_entry(&tmp, struct lnet_rtrbuf, rb_list);
list_del(&rb->rb_list);
lnet_destroy_rtrbuf(rb, npages);
}
}
static int
lnet_rtrpool_adjust_bufs(struct lnet_rtrbufpool *rbp, int nbufs, int cpt)
{
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 req_nbuffers number and excess buffers will be
* thrown away as they are returned to the free list. Credits
* then get adjusted as well.
* If we already have enough buffers allocated to serve the
* increase requested, then we can treat that the same way as we
* do the decrease. */
num_rb = nbufs - rbp->rbp_nbuffers;
if (nbufs <= rbp->rbp_req_nbuffers || num_rb <= 0) {
rbp->rbp_req_nbuffers = nbufs;
lnet_net_unlock(cpt);
return 0;
}
/* store the older value of rbp_req_nbuffers and then set it to
* the new request to prevent lnet_return_rx_credits_locked() from
* freeing buffers that we need to keep around */
old_req_nbufs = rbp->rbp_req_nbuffers;
rbp->rbp_req_nbuffers = nbufs;
lnet_net_unlock(cpt);
/* allocate the buffers on a local list first. If all buffers are
* allocated successfully then join this list to the rbp buffer
* list. If not then free all allocated buffers. */
while (num_rb-- > 0) {
rb = lnet_new_rtrbuf(rbp, cpt);
if (rb == NULL) {
CERROR("lnet: error allocating %ux%u page router buffers on CPT %u: rc = %d\n",
nbufs, npages, cpt, -ENOMEM);
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++;
}
lnet_net_lock(cpt);
list_splice_tail(&rb_list, &rbp->rbp_bufs);
rbp->rbp_nbuffers += num_buffers;
rbp->rbp_credits += num_buffers;
rbp->rbp_mincredits = rbp->rbp_credits;
/* We need to schedule blocked msg using the newly
* added buffers. */
while (!list_empty(&rbp->rbp_bufs) &&
!list_empty(&rbp->rbp_msgs))
lnet_schedule_blocked_locked(rbp);
lnet_net_unlock(cpt);
return 0;
failed:
while ((rb = list_first_entry_or_null(&rb_list,
struct lnet_rtrbuf,
rb_list)) != NULL) {
list_del(&rb->rb_list);
lnet_destroy_rtrbuf(rb, npages);
}
return -ENOMEM;
}
static void
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;
}
void
lnet_rtrpools_free(int keep_pools)
{
struct lnet_rtrbufpool *rtrp;
int i;
if (the_lnet.ln_rtrpools == NULL) /* uninitialized or freed */
return;
cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
lnet_rtrpool_free_bufs(&rtrp[LNET_TINY_BUF_IDX], i);
lnet_rtrpool_free_bufs(&rtrp[LNET_SMALL_BUF_IDX], i);
lnet_rtrpool_free_bufs(&rtrp[LNET_LARGE_BUF_IDX], i);
}
if (!keep_pools) {
cfs_percpt_free(the_lnet.ln_rtrpools);
the_lnet.ln_rtrpools = NULL;
}
}
static int
lnet_nrb_tiny_calculate(void)
{
int nrbs = LNET_NRB_TINY;
if (tiny_router_buffers < 0) {
LCONSOLE_ERROR("tiny_router_buffers=%d invalid when routing enabled\n",
tiny_router_buffers);
return -EINVAL;
}
if (tiny_router_buffers > 0) {
if (tiny_router_buffers < LNET_NRB_TINY_MIN)
CWARN("tiny_router_buffers=%d less than recommended minimum %d\n",
tiny_router_buffers, LNET_NRB_TINY_MIN);
nrbs = tiny_router_buffers;
}
nrbs /= LNET_CPT_NUMBER;
return max(nrbs, 1);
}
static int
lnet_nrb_small_calculate(void)
{
int nrbs = LNET_NRB_SMALL;
if (small_router_buffers < 0) {
LCONSOLE_ERROR("small_router_buffers=%d invalid when routing enabled\n",
small_router_buffers);
return -EINVAL;
}
if (small_router_buffers > 0) {
if (small_router_buffers < LNET_NRB_SMALL_MIN)
CWARN("small_router_buffers=%d less than recommended minimum %d\n",
small_router_buffers, LNET_NRB_SMALL_MIN);
nrbs = small_router_buffers;
}
nrbs /= LNET_CPT_NUMBER;
return max(nrbs, 1);
}
static int
lnet_nrb_large_calculate(void)
{
int nrbs = LNET_NRB_LARGE;
if (large_router_buffers < 0) {
LCONSOLE_ERROR("large_router_buffers=%d invalid when routing enabled\n",
large_router_buffers);
return -EINVAL;
}
if (large_router_buffers > 0) {
if (large_router_buffers < LNET_NRB_LARGE_MIN)
CWARN("large_router_buffers=%d less than recommended minimum %d\n",
large_router_buffers, LNET_NRB_LARGE_MIN);
nrbs = large_router_buffers;
}
nrbs /= LNET_CPT_NUMBER;
return max(nrbs, 1);
}
int
lnet_rtrpools_alloc(int im_a_router)
{
struct lnet_rtrbufpool *rtrp;
int nrb_tiny;
int nrb_small;
int nrb_large;
int rc;
int i;
if (!strcmp(forwarding, "")) {
/* not set either way */
if (!im_a_router)
return 0;
} else if (!strcmp(forwarding, "disabled")) {
/* explicitly disabled */
return 0;
} else if (!strcmp(forwarding, "enabled")) {
/* explicitly enabled */
} else {
rc = -EINVAL;
LCONSOLE_ERROR("lnet: forwarding='%s' not set to either 'enabled' or 'disabled': rc = %d\n",
forwarding, rc);
return rc;
}
nrb_tiny = lnet_nrb_tiny_calculate();
if (nrb_tiny < 0)
return -EINVAL;
nrb_small = lnet_nrb_small_calculate();
if (nrb_small < 0)
return -EINVAL;
nrb_large = lnet_nrb_large_calculate();
if (nrb_large < 0)
return -EINVAL;
the_lnet.ln_rtrpools = cfs_percpt_alloc(lnet_cpt_table(),
LNET_NRBPOOLS *
sizeof(struct lnet_rtrbufpool));
if (the_lnet.ln_rtrpools == NULL) {
rc = -ENOMEM;
LCONSOLE_ERROR("lnet: error allocating router buffer pool: rc = %d\n",
rc);
return rc;
}
cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
lnet_rtrpool_init(&rtrp[LNET_TINY_BUF_IDX], 0);
rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
nrb_tiny, i);
if (rc)
goto failed;
lnet_rtrpool_init(&rtrp[LNET_SMALL_BUF_IDX],
LNET_NRB_SMALL_PAGES);
rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
nrb_small, i);
if (rc)
goto failed;
lnet_rtrpool_init(&rtrp[LNET_LARGE_BUF_IDX],
LNET_NRB_LARGE_PAGES);
rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
nrb_large, i);
if (rc)
goto failed;
}
lnet_net_lock(LNET_LOCK_EX);
the_lnet.ln_routing = LNET_ROUTING_ENABLED;
lnet_net_unlock(LNET_LOCK_EX);
complete(&the_lnet.ln_mt_wait_complete);
return 0;
failed:
lnet_rtrpools_free(0);
return rc;
}
static int
lnet_rtrpools_adjust_helper(int tiny, int small, int large)
{
int nrb = 0;
int rc = 0;
int i;
struct lnet_rtrbufpool *rtrp;
/* If the provided values for each buffer pool are different than the
* configured values, we need to take action. */
if (tiny >= 0) {
tiny_router_buffers = tiny;
nrb = lnet_nrb_tiny_calculate();
cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_TINY_BUF_IDX],
nrb, i);
if (rc != 0)
return rc;
}
}
if (small >= 0) {
small_router_buffers = small;
nrb = lnet_nrb_small_calculate();
cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_SMALL_BUF_IDX],
nrb, i);
if (rc != 0)
return rc;
}
}
if (large >= 0) {
large_router_buffers = large;
nrb = lnet_nrb_large_calculate();
cfs_percpt_for_each(rtrp, i, the_lnet.ln_rtrpools) {
rc = lnet_rtrpool_adjust_bufs(&rtrp[LNET_LARGE_BUF_IDX],
nrb, i);
if (rc != 0)
return rc;
}
}
return 0;
}
int
lnet_rtrpools_adjust(int tiny, int small, int large)
{
/* this function doesn't revert the changes if adding new buffers
* failed. It's up to the user space caller to revert the
* changes. */
if (lnet_routing_disabled())
return 0;
return lnet_rtrpools_adjust_helper(tiny, small, large);
}
int
lnet_rtrpools_enable(void)
{
int rc = 0;
if (the_lnet.ln_routing == LNET_ROUTING_ENABLED ||
the_lnet.ln_routing == LNET_ROUTING_STARTING) {
return 0;
} else if (the_lnet.ln_routing == LNET_ROUTING_STOPPING) {
CERROR("Cannot enable routing while it is being stopped\n");
return -EBUSY;
}
if (the_lnet.ln_rtrpools == NULL)
/* If routing is turned off, and we have never
* initialized the pools before, just call the
* standard buffer pool allocation routine as
* if we are just configuring this for the first
* time. */
rc = lnet_rtrpools_alloc(1);
else
rc = lnet_rtrpools_adjust_helper(tiny_router_buffers,
small_router_buffers,
large_router_buffers);
if (rc)
return rc;
lnet_net_lock(LNET_LOCK_EX);
the_lnet.ln_routing = LNET_ROUTING_STARTING;
LCONSOLE_INFO("Message forwarding will be enabled in %ds\n",
alive_router_check_interval +
router_ping_timeout);
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;
}
void
lnet_rtrpools_disable(void)
{
if (lnet_routing_disabled())
return;
lnet_net_lock(LNET_LOCK_EX);
the_lnet.ln_routing = LNET_ROUTING_STOPPING;
the_lnet.ln_ping_target->pb_info.pi_features |=
LNET_PING_FEAT_RTE_DISABLED;
lnet_net_unlock(LNET_LOCK_EX);
LCONSOLE_INFO("Message forwarding will stop in %ds to %ds\n",
alive_router_check_interval + router_ping_timeout,
3 * (alive_router_check_interval + router_ping_timeout));
}
/*
* ni: local NI used to communicate with the peer
* nid: peer NID
* alive: true if peer is alive, false otherwise
* reset: reset health value. This is requested by the LND.
* when: notificaiton time.
*/
int
lnet_notify(struct lnet_ni *ni, struct lnet_nid *nid, bool alive, bool reset,
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 = lnet_nid2cpt(nid, ni);
unsigned int ns_status = alive ? LNET_NI_STATUS_UP :
LNET_NI_STATUS_DOWN;
LASSERT(!in_interrupt());
CDEBUG(D_NET, "%s notifying %s: %s\n",
(ni == NULL) ? "userspace" : libcfs_nidstr(&ni->ni_nid),
libcfs_nidstr(nid), alive ? "up" : "down");
if (ni != NULL &&
LNET_NID_NET(&ni->ni_nid) != LNET_NID_NET(nid)) {
CWARN("Ignoring notification of %s %s by %s (different net)\n",
libcfs_nidstr(nid), alive ? "birth" : "death",
libcfs_nidstr(&ni->ni_nid));
return -EINVAL;
}
/* can't do predictions... */
if (when > now) {
CWARN("Ignoring prediction from %s of %s %s %lld seconds in the future\n",
ni ? libcfs_nidstr(&ni->ni_nid) : "userspace",
libcfs_nidstr(nid), alive ? "up" : "down", when - now);
return -EINVAL;
}
if (ni && !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_state != LNET_STATE_RUNNING) {
lnet_net_unlock(cpt);
return -ESHUTDOWN;
}
lpni = lnet_peer_ni_find_locked(nid);
if (!lpni) {
/* nid not found */
lnet_net_unlock(cpt);
CDEBUG(D_NET, "%s not found\n", libcfs_nidstr(nid));
return 0;
}
if (lpni->lpni_cpt != cpt) {
lnet_net_unlock(cpt);
cpt = lpni->lpni_cpt;
lnet_net_lock(cpt);
}
if (ni && !alive && when < lpni->lpni_last_alive)
when = lpni->lpni_last_alive;
if (lpni->lpni_timestamp > when) {
CDEBUG(D_NET, "Out of date\n");
goto out_lpni_decref;
}
lpni->lpni_timestamp = when;
lp = lpni->lpni_peer_net->lpn_peer;
/* If this peer NI belongs to an LNet router then update the associated
* route aliveness. We update before taking lpni_lock below to avoid
* holding both lpni_lock and lp_lock which is taken in
* lnet_is_discovery_disabled().
*/
if (lp->lp_rtr_refcount) {
if (reset)
/* reset flag indicates gateway peer went up or down */
lp->lp_alive = alive;
/* If discovery is disabled, locally or on the gateway, then
* any routes using lpni as next-hop need to be updated
*/
if (lnet_is_discovery_disabled(lp)) {
list_for_each_entry(route, &lp->lp_routes, lr_gwlist) {
if (nid_same(&route->lr_nid, &lpni->lpni_nid))
lnet_set_route_aliveness(route, alive);
}
}
}
spin_lock(&lpni->lpni_lock);
/* Depending on lnet_peers_start_down()/check_routers_before_use the
* lpni_ns_status may initialize to either UP or DOWN. Thus, the
* first notification that we receive may match the existing status.
* We do not want to ignore this notification.
*/
if (lpni->lpni_notified && lpni->lpni_ns_status == ns_status) {
CDEBUG(D_NET, "Old news\n");
goto out_lpni_unlock;
}
lpni->lpni_notified = true;
lpni->lpni_ns_status = ns_status;
while (lpni->lpni_notifying) {
/* Previous event is being processed */
spin_unlock(&lpni->lpni_lock);
lnet_net_unlock(cpt);
schedule();
lnet_net_lock(cpt);
spin_lock(&lpni->lpni_lock);
};
lpni->lpni_notifying = true;
if (alive && reset)
lnet_set_lpni_healthv_locked(lpni, LNET_MAX_HEALTH_VALUE);
if (lpni->lpni_ns_status == LNET_NI_STATUS_DOWN &&
ni && ni->ni_net->net_lnd->lnd_notify_peer_down) {
spin_unlock(&lpni->lpni_lock);
lnet_net_unlock(cpt);
(ni->ni_net->net_lnd->lnd_notify_peer_down)(&lpni->lpni_nid);
lnet_net_lock(cpt);
spin_lock(&lpni->lpni_lock);
}
lpni->lpni_notifying = false;
out_lpni_unlock:
spin_unlock(&lpni->lpni_lock);
out_lpni_decref:
lnet_peer_ni_decref_locked(lpni);
lnet_net_unlock(cpt);
return 0;
}
EXPORT_SYMBOL(lnet_notify);
