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Hostentry: made src ea_list atomic to help with consistency

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This commit is contained in:
Maria Matejka 2024-05-31 09:47:56 +02:00
parent a2ddd3d443
commit ce1a8be9af
2 changed files with 13 additions and 11 deletions
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2
nest/route.h
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@ -622,7 +622,7 @@ struct hostentry {
u32 igp_metric; /* Chosen route IGP metric */ u32 igp_metric; /* Chosen route IGP metric */
_Atomic u32 version; /* Bumped on update */ _Atomic u32 version; /* Bumped on update */
byte nexthop_linkable; /* Nexthop list is completely non-device */ byte nexthop_linkable; /* Nexthop list is completely non-device */
ea_list *src; /* Source attributes */ ea_list * _Atomic src; /* Source attributes */
struct lfuc uc; /* Use count */ struct lfuc uc; /* Use count */
}; };

22
nest/rt-table.c
View File

@ -3275,13 +3275,14 @@ rta_apply_hostentry(ea_list **to, struct hostentry_adata *head)
do { do {
ea_set_attr_u32(to, &ea_gen_igp_metric, 0, he->igp_metric); ea_set_attr_u32(to, &ea_gen_igp_metric, 0, he->igp_metric);
if (!he->src) ea_list *src = atomic_load_explicit(&he->src, memory_order_acquire);
if (!src)
{ {
ea_set_dest(to, 0, RTD_UNREACHABLE); ea_set_dest(to, 0, RTD_UNREACHABLE);
break; break;
} }
eattr *he_nh_ea = ea_find(he->src, &ea_gen_nexthop); eattr *he_nh_ea = ea_find(src, &ea_gen_nexthop);
ASSERT_DIE(he_nh_ea); ASSERT_DIE(he_nh_ea);
struct nexthop_adata *nhad = (struct nexthop_adata *) he_nh_ea->u.ptr; struct nexthop_adata *nhad = (struct nexthop_adata *) he_nh_ea->u.ptr;
@ -3291,7 +3292,7 @@ rta_apply_hostentry(ea_list **to, struct hostentry_adata *head)
!lnum && he->nexthop_linkable) !lnum && he->nexthop_linkable)
{ {
/* Just link the nexthop chain, no label append happens. */ /* Just link the nexthop chain, no label append happens. */
ea_copy_attr(to, he->src, &ea_gen_nexthop); ea_copy_attr(to, src, &ea_gen_nexthop);
break; break;
} }
@ -4225,7 +4226,7 @@ hc_new_hostentry(struct hostcache *hc, pool *p, ip_addr a, ip_addr ll, rtable *d
static void static void
hc_delete_hostentry(struct hostcache *hc, pool *p, struct hostentry *he) hc_delete_hostentry(struct hostcache *hc, pool *p, struct hostentry *he)
{ {
ea_free(he->src); ea_free(atomic_load_explicit(&he->src, memory_order_relaxed));
rem_node(&he->ln); rem_node(&he->ln);
hc_remove(hc, he); hc_remove(hc, he);
@ -4351,7 +4352,7 @@ rt_free_hostcache(struct rtable_private *tab)
WALK_LIST(n, hc->hostentries) WALK_LIST(n, hc->hostentries)
{ {
SKIP_BACK_DECLARE(struct hostentry, he, ln, n); SKIP_BACK_DECLARE(struct hostentry, he, ln, n);
ea_free(he->src); ea_free(atomic_load_explicit(&he->src, memory_order_relaxed));
if (!lfuc_finished(&he->uc)) if (!lfuc_finished(&he->uc))
log(L_ERR "Hostcache is not empty in table %s", tab->name); log(L_ERR "Hostcache is not empty in table %s", tab->name);
@ -4397,7 +4398,6 @@ rt_get_igp_metric(const rte *rt)
static int static int
rt_update_hostentry(struct rtable_private *tab, struct hostentry *he) rt_update_hostentry(struct rtable_private *tab, struct hostentry *he)
{ {
ea_list *old_src = he->src;
int direct = 0; int direct = 0;
int pxlen = 0; int pxlen = 0;
@ -4405,7 +4405,8 @@ rt_update_hostentry(struct rtable_private *tab, struct hostentry *he)
ASSERT_DIE((atomic_fetch_add_explicit(&he->version, 1, memory_order_acq_rel) & 1) == 0); ASSERT_DIE((atomic_fetch_add_explicit(&he->version, 1, memory_order_acq_rel) & 1) == 0);
/* Reset the hostentry */ /* Reset the hostentry */
he->src = NULL; ea_list *old_src = atomic_exchange_explicit(&he->src, NULL, memory_order_acq_rel);
ea_list *new_src = NULL;
he->nexthop_linkable = 0; he->nexthop_linkable = 0;
he->igp_metric = 0; he->igp_metric = 0;
@ -4455,11 +4456,11 @@ rt_update_hostentry(struct rtable_private *tab, struct hostentry *he)
direct++; direct++;
} }
he->src = ea_ref(a); new_src = ea_ref(a);
he->nexthop_linkable = !direct; he->nexthop_linkable = !direct;
he->igp_metric = rt_get_igp_metric(&e->rte); he->igp_metric = rt_get_igp_metric(&e->rte);
if ((old_src != he->src) && (tab->debug & D_ROUTES)) if ((old_src != new_src) && (tab->debug & D_ROUTES))
if (ipa_zero(he->link) || ipa_equal(he->link, he->addr)) if (ipa_zero(he->link) || ipa_equal(he->link, he->addr))
log(L_TRACE "%s: Hostentry %p for %I in %s resolved via %N (%uG)", log(L_TRACE "%s: Hostentry %p for %I in %s resolved via %N (%uG)",
tab->name, he, he->addr, he->tab->name, e->rte.net, e->rte.src->global_id); tab->name, he, he->addr, he->tab->name, e->rte.net, e->rte.src->global_id);
@ -4477,6 +4478,7 @@ rt_update_hostentry(struct rtable_private *tab, struct hostentry *he)
done: done:
/* Signalize work done and wait for readers */ /* Signalize work done and wait for readers */
ASSERT_DIE(atomic_exchange_explicit(&he->src, new_src, memory_order_acq_rel) == NULL);
ASSERT_DIE((atomic_fetch_add_explicit(&he->version, 1, memory_order_acq_rel) & 1) == 1); ASSERT_DIE((atomic_fetch_add_explicit(&he->version, 1, memory_order_acq_rel) & 1) == 1);
synchronize_rcu(); synchronize_rcu();
@ -4484,7 +4486,7 @@ done:
trie_add_prefix(tab->hostcache->trie, &he_addr, pxlen, he_addr.pxlen); trie_add_prefix(tab->hostcache->trie, &he_addr, pxlen, he_addr.pxlen);
ea_free(old_src); ea_free(old_src);
return old_src != he->src; return old_src != new_src;
} }
static void static void