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Split route table event into separate events

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The former rt_event is dropped in favour of separate table events.
This allows for selective corking of NHU and prune.
This commit is contained in:
Maria Matejka 2021-10-22 21:03:25 +02:00
parent 6e841b3153
commit 445eeaf3df
4 changed files with 69 additions and 100 deletions
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16
nest/proto.c
View File

@ -658,6 +658,8 @@ channel_aux_stopped(void *data)
else else
c->in_table = NULL; c->in_table = NULL;
rfree(cat->tab->rp);
mb_free(cat); mb_free(cat);
return channel_check_stopped(c); return channel_check_stopped(c);
} }
@ -666,7 +668,7 @@ static void
channel_aux_import_stopped(struct rt_import_request *req) channel_aux_import_stopped(struct rt_import_request *req)
{ {
struct channel_aux_table *cat = SKIP_BACK(struct channel_aux_table, push, req); struct channel_aux_table *cat = SKIP_BACK(struct channel_aux_table, push, req);
ASSERT_DIE(cat->stop); ASSERT_DIE(cat->tab->delete_event);
} }
static void static void
@ -675,25 +677,23 @@ channel_aux_export_stopped(struct rt_export_request *req)
struct channel_aux_table *cat = SKIP_BACK(struct channel_aux_table, get, req); struct channel_aux_table *cat = SKIP_BACK(struct channel_aux_table, get, req);
req->hook = NULL; req->hook = NULL;
if (cat->refeed_pending && !cat->stop) if (cat->refeed_pending && !cat->tab->delete_event)
{ {
cat->refeed_pending = 0; cat->refeed_pending = 0;
rt_request_export(cat->tab, req); rt_request_export(cat->tab, req);
} }
else else
ASSERT_DIE(cat->stop); ASSERT_DIE(cat->tab->delete_event);
} }
static void static void
channel_aux_stop(struct channel_aux_table *cat) channel_aux_stop(struct channel_aux_table *cat)
{ {
cat->stop = 1;
rt_stop_import(&cat->push, channel_aux_import_stopped); rt_stop_import(&cat->push, channel_aux_import_stopped);
rt_stop_export(&cat->get, channel_aux_export_stopped); rt_stop_export(&cat->get, channel_aux_export_stopped);
cat->tab->deleted = channel_aux_stopped; cat->tab->delete_event = ev_new_init(cat->tab->rp, channel_aux_stopped, cat);
cat->tab->del_data = cat;
rt_unlock_table(cat->tab); rt_unlock_table(cat->tab);
} }
@ -886,7 +886,6 @@ channel_setup_in_table(struct channel *c, int best)
c->in_table->c = c; c->in_table->c = c;
c->in_table->tab = rt_setup(c->proto->pool, &cat->tab_cf); c->in_table->tab = rt_setup(c->proto->pool, &cat->tab_cf);
self_link(&c->in_table->tab->n);
rt_lock_table(c->in_table->tab); rt_lock_table(c->in_table->tab);
rt_request_import(c->in_table->tab, &c->in_table->push); rt_request_import(c->in_table->tab, &c->in_table->push);
@ -929,7 +928,6 @@ channel_setup_out_table(struct channel *c)
c->out_table->c = c; c->out_table->c = c;
c->out_table->tab = rt_setup(c->proto->pool, &cat->tab_cf); c->out_table->tab = rt_setup(c->proto->pool, &cat->tab_cf);
self_link(&c->out_table->tab->n);
rt_lock_table(c->out_table->tab); rt_lock_table(c->out_table->tab);
rt_request_import(c->out_table->tab, &c->out_table->push); rt_request_import(c->out_table->tab, &c->out_table->push);

2
nest/protocol.h
View File

@ -568,7 +568,7 @@ struct channel_aux_table {
struct rt_import_request push; struct rt_import_request push;
struct rt_export_request get; struct rt_export_request get;
rtable *tab; rtable *tab;
u8 stop; event *stop;
u8 refeed_pending; u8 refeed_pending;
}; };

12
nest/route.h
View File

@ -147,6 +147,7 @@ void fit_copy(struct fib *f, struct fib_iterator *dst, struct fib_iterator *src)
struct rtable_config { struct rtable_config {
node n; node n;
char *name; char *name;
struct config *config;
struct rtable *table; struct rtable *table;
struct proto_config *krt_attached; /* Kernel syncer attached to this table */ struct proto_config *krt_attached; /* Kernel syncer attached to this table */
uint addr_type; /* Type of address data stored in table (NET_*) */ uint addr_type; /* Type of address data stored in table (NET_*) */
@ -175,17 +176,17 @@ typedef struct rtable {
struct hmap id_map; struct hmap id_map;
struct hostcache *hostcache; struct hostcache *hostcache;
struct rtable_config *config; /* Configuration of this table */ struct rtable_config *config; /* Configuration of this table */
void (*deleted)(void *); /* Table should free itself. Call this when it is done. */ struct event *prune_event; /* Event to prune abandoned routes */
void *del_data; struct event *ec_event; /* Event to prune finished exports */
struct event *rt_event; /* Routing table event */ struct event *hcu_event; /* Event to update host cache */
struct event *nhu_event; /* Event to update next hops */
struct event *delete_event; /* Event to delete the table */
btime last_rt_change; /* Last time when route changed */ btime last_rt_change; /* Last time when route changed */
btime base_settle_time; /* Start time of rtable settling interval */ btime base_settle_time; /* Start time of rtable settling interval */
btime gc_time; /* Time of last GC */ btime gc_time; /* Time of last GC */
int gc_counter; /* Number of operations since last GC */ int gc_counter; /* Number of operations since last GC */
byte prune_state; /* Table prune state, 1 -> scheduled, 2-> running */ byte prune_state; /* Table prune state, 1 -> scheduled, 2-> running */
byte hcu_scheduled; /* Hostcache update is scheduled */
byte nhu_state; /* Next Hop Update state */ byte nhu_state; /* Next Hop Update state */
byte export_used; /* Export journal setup scheduled */
struct fib_iterator prune_fit; /* Rtable prune FIB iterator */ struct fib_iterator prune_fit; /* Rtable prune FIB iterator */
struct fib_iterator nhu_fit; /* Next Hop Update FIB iterator */ struct fib_iterator nhu_fit; /* Next Hop Update FIB iterator */
struct tbf rl_pipe; /* Rate limiting token buffer for pipe collisions */ struct tbf rl_pipe; /* Rate limiting token buffer for pipe collisions */
@ -475,7 +476,6 @@ void rt_unlock_table(rtable *);
void rt_subscribe(rtable *tab, struct rt_subscription *s); void rt_subscribe(rtable *tab, struct rt_subscription *s);
void rt_unsubscribe(struct rt_subscription *s); void rt_unsubscribe(struct rt_subscription *s);
rtable *rt_setup(pool *, struct rtable_config *); rtable *rt_setup(pool *, struct rtable_config *);
static inline void rt_shutdown(rtable *r) { rfree(r->rp); }
static inline net *net_find(rtable *tab, const net_addr *addr) { return (net *) fib_find(&tab->fib, addr); } static inline net *net_find(rtable *tab, const net_addr *addr) { return (net *) fib_find(&tab->fib, addr); }
static inline net *net_find_valid(rtable *tab, const net_addr *addr) static inline net *net_find_valid(rtable *tab, const net_addr *addr)

139
nest/rt-table.c
View File

@ -65,14 +65,14 @@ struct rt_export_block {
static void rt_free_hostcache(rtable *tab); static void rt_free_hostcache(rtable *tab);
static void rt_notify_hostcache(rtable *tab, net *net); static void rt_notify_hostcache(rtable *tab, net *net);
static void rt_update_hostcache(rtable *tab); static void rt_update_hostcache(void *tab);
static void rt_next_hop_update(rtable *tab); static void rt_next_hop_update(void *tab);
static inline void rt_prune_table(rtable *tab); static inline void rt_prune_table(void *tab);
static inline void rt_schedule_notify(rtable *tab); static inline void rt_schedule_notify(rtable *tab);
static void rt_feed_channel(void *); static void rt_feed_channel(void *);
static inline void rt_export_used(rtable *tab); static inline void rt_export_used(rtable *tab);
static void rt_export_cleanup(rtable *tab); static void rt_export_cleanup(void *tab);
static inline void rte_update_lock(void); static inline void rte_update_lock(void);
static inline void rte_update_unlock(void); static inline void rte_update_unlock(void);
@ -1860,7 +1860,7 @@ rte_dump(struct rte_storage *e)
void void
rt_dump(rtable *t) rt_dump(rtable *t)
{ {
debug("Dump of routing table <%s>%s\n", t->name, t->deleted ? " (deleted)" : ""); debug("Dump of routing table <%s>%s\n", t->name, t->delete_event ? " (deleted)" : "");
#ifdef DEBUGGING #ifdef DEBUGGING
fib_check(&t->fib); fib_check(&t->fib);
#endif #endif
@ -1891,9 +1891,9 @@ rt_dump_all(void)
void void
rt_dump_hooks(rtable *tab) rt_dump_hooks(rtable *tab)
{ {
debug("Dump of hooks in routing table <%s>%s\n", tab->name, tab->deleted ? " (deleted)" : ""); debug("Dump of hooks in routing table <%s>%s\n", tab->name, tab->delete_event ? " (deleted)" : "");
debug(" nhu_state=%u hcu_scheduled=%u use_count=%d rt_count=%u\n", debug(" nhu_state=%u hcu_scheduled=%u use_count=%d rt_count=%u\n",
tab->nhu_state, tab->hcu_scheduled, tab->use_count, tab->rt_count); tab->nhu_state, ev_active(tab->hcu_event), tab->use_count, tab->rt_count);
debug(" last_rt_change=%t gc_time=%t gc_counter=%d prune_state=%u\n", debug(" last_rt_change=%t gc_time=%t gc_counter=%d prune_state=%u\n",
tab->last_rt_change, tab->gc_time, tab->gc_counter, tab->prune_state); tab->last_rt_change, tab->gc_time, tab->gc_counter, tab->prune_state);
@ -1930,21 +1930,11 @@ rt_dump_hooks_all(void)
rt_dump_hooks(t); rt_dump_hooks(t);
} }
static inline void
rt_schedule_hcu(rtable *tab)
{
if (tab->hcu_scheduled)
return;
tab->hcu_scheduled = 1;
ev_schedule(tab->rt_event);
}
static inline void static inline void
rt_schedule_nhu(rtable *tab) rt_schedule_nhu(rtable *tab)
{ {
if (tab->nhu_state == NHU_CLEAN) if (tab->nhu_state == NHU_CLEAN)
ev_schedule(tab->rt_event); ev_schedule(tab->nhu_event);
/* state change: /* state change:
* NHU_CLEAN -> NHU_SCHEDULED * NHU_CLEAN -> NHU_SCHEDULED
@ -1957,7 +1947,7 @@ void
rt_schedule_prune(rtable *tab) rt_schedule_prune(rtable *tab)
{ {
if (tab->prune_state == 0) if (tab->prune_state == 0)
ev_schedule(tab->rt_event); ev_schedule(tab->prune_event);
/* state change 0->1, 2->3 */ /* state change 0->1, 2->3 */
tab->prune_state |= 1; tab->prune_state |= 1;
@ -1969,36 +1959,9 @@ rt_export_used(rtable *tab)
if (config->table_debug) if (config->table_debug)
log(L_TRACE "%s: Export cleanup requested", tab->name); log(L_TRACE "%s: Export cleanup requested", tab->name);
if (tab->export_used) ev_schedule(tab->ec_event);
return;
tab->export_used = 1;
ev_schedule(tab->rt_event);
} }
static void
rt_event(void *ptr)
{
rtable *tab = ptr;
rt_lock_table(tab);
if (tab->export_used)
rt_export_cleanup(tab);
if (tab->hcu_scheduled)
rt_update_hostcache(tab);
if (tab->nhu_state)
rt_next_hop_update(tab);
if (tab->prune_state)
rt_prune_table(tab);
rt_unlock_table(tab);
}
static inline btime static inline btime
rt_settled_time(rtable *tab) rt_settled_time(rtable *tab)
{ {
@ -2078,13 +2041,9 @@ rt_free(resource *_r)
DBG("Deleting routing table %s\n", r->name); DBG("Deleting routing table %s\n", r->name);
ASSERT_DIE(r->use_count == 0); ASSERT_DIE(r->use_count == 0);
ASSERT_DIE(r->deleted); ASSERT_DIE(r->rt_count == 0);
ASSERT_DIE(EMPTY_LIST(r->imports));
r->config->table = NULL; ASSERT_DIE(EMPTY_LIST(r->exports));
rem_node(&r->n);
if (r->hostcache)
rt_free_hostcache(r);
/* Freed automagically by the resource pool /* Freed automagically by the resource pool
fib_free(&r->fib); fib_free(&r->fib);
@ -2142,7 +2101,11 @@ rt_setup(pool *pp, struct rtable_config *cf)
init_list(&t->pending_exports); init_list(&t->pending_exports);
init_list(&t->subscribers); init_list(&t->subscribers);
t->rt_event = ev_new_init(p, rt_event, t); t->ec_event = ev_new_init(p, rt_export_cleanup, t);
t->prune_event = ev_new_init(p, rt_prune_table, t);
t->hcu_event = ev_new_init(p, rt_update_hostcache, t);
t->nhu_event = ev_new_init(p, rt_next_hop_update, t);
t->export_timer = tm_new_init(p, rt_announce_exports, t, 0, 0); t->export_timer = tm_new_init(p, rt_announce_exports, t, 0, 0);
t->last_rt_change = t->gc_time = current_time(); t->last_rt_change = t->gc_time = current_time();
t->next_export_seq = 1; t->next_export_seq = 1;
@ -2167,7 +2130,6 @@ rt_init(void)
init_list(&routing_tables); init_list(&routing_tables);
} }
/** /**
* rt_prune_table - prune a routing table * rt_prune_table - prune a routing table
* *
@ -2183,8 +2145,9 @@ rt_init(void)
* iteration. * iteration.
*/ */
static void static void
rt_prune_table(rtable *tab) rt_prune_table(void *data)
{ {
rtable *tab = data;
struct fib_iterator *fit = &tab->prune_fit; struct fib_iterator *fit = &tab->prune_fit;
int limit = 512; int limit = 512;
@ -2232,7 +2195,7 @@ again:
if (limit <= 0) if (limit <= 0)
{ {
FIB_ITERATE_PUT(fit); FIB_ITERATE_PUT(fit);
ev_schedule(tab->rt_event); ev_schedule(tab->prune_event);
return; return;
} }
@ -2288,9 +2251,9 @@ again:
} }
static void static void
rt_export_cleanup(rtable *tab) rt_export_cleanup(void *data)
{ {
tab->export_used = 0; rtable *tab = data;
u64 min_seq = ~((u64) 0); u64 min_seq = ~((u64) 0);
struct rt_pending_export *last_export_to_free = NULL; struct rt_pending_export *last_export_to_free = NULL;
@ -2447,9 +2410,6 @@ done:;
imports_stopped = 1; imports_stopped = 1;
} }
if (tab->export_used)
ev_schedule(tab->rt_event);
if (imports_stopped) if (imports_stopped)
{ {
if (config->table_debug) if (config->table_debug)
@ -2683,8 +2643,9 @@ rt_next_hop_update_net(rtable *tab, net *n)
} }
static void static void
rt_next_hop_update(rtable *tab) rt_next_hop_update(void *data)
{ {
rtable *tab = data;
struct fib_iterator *fit = &tab->nhu_fit; struct fib_iterator *fit = &tab->nhu_fit;
int max_feed = 32; int max_feed = 32;
@ -2702,7 +2663,7 @@ rt_next_hop_update(rtable *tab)
if (max_feed <= 0) if (max_feed <= 0)
{ {
FIB_ITERATE_PUT(fit); FIB_ITERATE_PUT(fit);
ev_schedule(tab->rt_event); ev_schedule(tab->nhu_event);
return; return;
} }
max_feed -= rt_next_hop_update_net(tab, n); max_feed -= rt_next_hop_update_net(tab, n);
@ -2716,7 +2677,7 @@ rt_next_hop_update(rtable *tab)
tab->nhu_state &= 1; tab->nhu_state &= 1;
if (tab->nhu_state != NHU_CLEAN) if (tab->nhu_state != NHU_CLEAN)
ev_schedule(tab->rt_event); ev_schedule(tab->nhu_event);
} }
@ -2738,6 +2699,7 @@ rt_new_table(struct symbol *s, uint addr_type)
c->gc_min_time = 5; c->gc_min_time = 5;
c->min_settle_time = 1 S; c->min_settle_time = 1 S;
c->max_settle_time = 20 S; c->max_settle_time = 20 S;
c->config = new_config;
add_tail(&new_config->tables, &c->n); add_tail(&new_config->tables, &c->n);
@ -2773,17 +2735,12 @@ rt_lock_table(rtable *r)
void void
rt_unlock_table(rtable *r) rt_unlock_table(rtable *r)
{ {
if (!--r->use_count && r->deleted) if (!--r->use_count && r->delete_event)
{ /* Delete the routing table by freeing its pool */
void *del_data = r->del_data; ev_schedule(r->delete_event);
void (*deleted)(void *) = r->deleted;
/* Delete the routing table by freeing its pool */
rt_shutdown(r);
deleted(del_data);
}
} }
static struct rtable_config * static struct rtable_config *
rt_find_table_config(struct config *cf, char *name) rt_find_table_config(struct config *cf, char *name)
{ {
@ -2791,7 +2748,23 @@ rt_find_table_config(struct config *cf, char *name)
return (sym && (sym->class == SYM_TABLE)) ? sym->table : NULL; return (sym && (sym->class == SYM_TABLE)) ? sym->table : NULL;
} }
static void rt_config_del_obstacle(void *data) { config_del_obstacle(data); } static void
rt_done(void *data)
{
rtable *t = data;
struct rtable_config *tc = t->config;
struct config *c = tc->config;
tc->table = NULL;
rem_node(&t->n);
if (t->hostcache)
rt_free_hostcache(t);
rfree(t->rp);
config_del_obstacle(c);
}
/** /**
* rt_commit - commit new routing table configuration * rt_commit - commit new routing table configuration
@ -2816,7 +2789,7 @@ rt_commit(struct config *new, struct config *old)
WALK_LIST(o, old->tables) WALK_LIST(o, old->tables)
{ {
rtable *ot = o->table; rtable *ot = o->table;
if (!ot->deleted) if (!ot->delete_event)
{ {
r = rt_find_table_config(new, o->name); r = rt_find_table_config(new, o->name);
if (r && (r->addr_type == o->addr_type) && !new->shutdown) if (r && (r->addr_type == o->addr_type) && !new->shutdown)
@ -2832,8 +2805,7 @@ rt_commit(struct config *new, struct config *old)
{ {
DBG("\t%s: deleted\n", o->name); DBG("\t%s: deleted\n", o->name);
rt_lock_table(ot); rt_lock_table(ot);
ot->deleted = rt_config_del_obstacle; ot->delete_event = ev_new_init(ot->rp, rt_done, ot);
ot->del_data = old;
config_add_obstacle(old); config_add_obstacle(old);
rt_unlock_table(ot); rt_unlock_table(ot);
} }
@ -3060,11 +3032,11 @@ rt_free_hostcache(rtable *tab)
static void static void
rt_notify_hostcache(rtable *tab, net *net) rt_notify_hostcache(rtable *tab, net *net)
{ {
if (tab->hcu_scheduled) if (ev_active(tab->hcu_event))
return; return;
if (trie_match_net(tab->hostcache->trie, net->n.addr)) if (trie_match_net(tab->hostcache->trie, net->n.addr))
rt_schedule_hcu(tab); ev_schedule(tab->hcu_event);
} }
static int static int
@ -3161,8 +3133,9 @@ done:
} }
static void static void
rt_update_hostcache(rtable *tab) rt_update_hostcache(void *data)
{ {
rtable *tab = data;
struct hostcache *hc = tab->hostcache; struct hostcache *hc = tab->hostcache;
struct hostentry *he; struct hostentry *he;
node *n, *x; node *n, *x;
@ -3183,8 +3156,6 @@ rt_update_hostcache(rtable *tab)
if (rt_update_hostentry(tab, he)) if (rt_update_hostentry(tab, he))
rt_schedule_nhu(he->tab); rt_schedule_nhu(he->tab);
} }
tab->hcu_scheduled = 0;
} }
struct hostentry * struct hostentry *