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Message-ID: <20241017070445.4013745-2-gnaaman@drivenets.com>
Date: Thu, 17 Oct 2024 07:04:36 +0000
From: Gilad Naaman <gnaaman@...venets.com>
To: netdev <netdev@...r.kernel.org>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: Gilad Naaman <gnaaman@...venets.com>,
Kuniyuki Iwashima <kuniyu@...zon.com>,
Ido Schimmel <idosch@...dia.com>,
Petr Machata <petrm@...dia.com>
Subject: [PATCH net-next v5 1/6] Add hlist_node to struct neighbour
Add a doubly-linked node to neighbours, so that they
can be deleted without iterating the entire bucket they're in.
Signed-off-by: Gilad Naaman <gnaaman@...venets.com>
---
include/net/neighbour.h | 2 ++
net/core/neighbour.c | 40 ++++++++++++++++++++++++++++++++++++++--
2 files changed, 40 insertions(+), 2 deletions(-)
diff --git a/include/net/neighbour.h b/include/net/neighbour.h
index 3887ed9e5026..0402447854c7 100644
--- a/include/net/neighbour.h
+++ b/include/net/neighbour.h
@@ -136,6 +136,7 @@ struct neigh_statistics {
struct neighbour {
struct neighbour __rcu *next;
+ struct hlist_node hash;
struct neigh_table *tbl;
struct neigh_parms *parms;
unsigned long confirmed;
@@ -191,6 +192,7 @@ struct pneigh_entry {
struct neigh_hash_table {
struct neighbour __rcu **hash_buckets;
+ struct hlist_head *hash_heads;
unsigned int hash_shift;
__u32 hash_rnd[NEIGH_NUM_HASH_RND];
struct rcu_head rcu;
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 395ae1626eef..45c8df801dfb 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -217,6 +217,7 @@ static bool neigh_del(struct neighbour *n, struct neighbour __rcu **np,
neigh = rcu_dereference_protected(n->next,
lockdep_is_held(&tbl->lock));
rcu_assign_pointer(*np, neigh);
+ hlist_del_rcu(&n->hash);
neigh_mark_dead(n);
retval = true;
}
@@ -403,6 +404,7 @@ static void neigh_flush_dev(struct neigh_table *tbl, struct net_device *dev,
rcu_assign_pointer(*np,
rcu_dereference_protected(n->next,
lockdep_is_held(&tbl->lock)));
+ hlist_del_rcu(&n->hash);
write_lock(&n->lock);
neigh_del_timer(n);
neigh_mark_dead(n);
@@ -530,27 +532,47 @@ static void neigh_get_hash_rnd(u32 *x)
static struct neigh_hash_table *neigh_hash_alloc(unsigned int shift)
{
+ size_t hash_heads_size = (1 << shift) * sizeof(struct hlist_head);
size_t size = (1 << shift) * sizeof(struct neighbour *);
- struct neigh_hash_table *ret;
struct neighbour __rcu **buckets;
+ struct hlist_head *hash_heads;
+ struct neigh_hash_table *ret;
int i;
+ hash_heads = NULL;
+
ret = kmalloc(sizeof(*ret), GFP_ATOMIC);
if (!ret)
return NULL;
if (size <= PAGE_SIZE) {
buckets = kzalloc(size, GFP_ATOMIC);
+
+ if (buckets) {
+ hash_heads = kzalloc(hash_heads_size, GFP_ATOMIC);
+ if (!hash_heads)
+ kfree(buckets);
+ }
} else {
buckets = (struct neighbour __rcu **)
__get_free_pages(GFP_ATOMIC | __GFP_ZERO,
get_order(size));
kmemleak_alloc(buckets, size, 1, GFP_ATOMIC);
+
+ if (buckets) {
+ hash_heads = (struct hlist_head *)
+ __get_free_pages(GFP_ATOMIC | __GFP_ZERO,
+ get_order(hash_heads_size));
+ kmemleak_alloc(hash_heads, hash_heads_size, 1, GFP_ATOMIC);
+ if (!hash_heads)
+ free_pages((unsigned long)buckets, get_order(size));
+ }
}
- if (!buckets) {
+ if (!buckets || !hash_heads) {
kfree(ret);
return NULL;
}
ret->hash_buckets = buckets;
+ ret->hash_heads = hash_heads;
ret->hash_shift = shift;
for (i = 0; i < NEIGH_NUM_HASH_RND; i++)
neigh_get_hash_rnd(&ret->hash_rnd[i]);
@@ -564,6 +586,8 @@ static void neigh_hash_free_rcu(struct rcu_head *head)
rcu);
size_t size = (1 << nht->hash_shift) * sizeof(struct neighbour *);
struct neighbour __rcu **buckets = nht->hash_buckets;
+ size_t hash_heads_size = (1 << nht->hash_shift) * sizeof(struct hlist_head);
+ struct hlist_head *hash_heads = nht->hash_heads;
if (size <= PAGE_SIZE) {
kfree(buckets);
@@ -571,6 +595,13 @@ static void neigh_hash_free_rcu(struct rcu_head *head)
kmemleak_free(buckets);
free_pages((unsigned long)buckets, get_order(size));
}
+
+ if (hash_heads_size < PAGE_SIZE) {
+ kfree(hash_heads);
+ } else {
+ kmemleak_free(hash_heads);
+ free_pages((unsigned long)hash_heads, get_order(hash_heads_size));
+ }
kfree(nht);
}
@@ -607,6 +638,8 @@ static struct neigh_hash_table *neigh_hash_grow(struct neigh_table *tbl,
new_nht->hash_buckets[hash],
lockdep_is_held(&tbl->lock)));
rcu_assign_pointer(new_nht->hash_buckets[hash], n);
+ hlist_del_rcu(&n->hash);
+ hlist_add_head_rcu(&n->hash, &new_nht->hash_heads[hash]);
}
}
@@ -717,6 +750,7 @@ ___neigh_create(struct neigh_table *tbl, const void *pkey,
rcu_dereference_protected(nht->hash_buckets[hash_val],
lockdep_is_held(&tbl->lock)));
rcu_assign_pointer(nht->hash_buckets[hash_val], n);
+ hlist_add_head_rcu(&n->hash, &nht->hash_heads[hash_val]);
write_unlock_bh(&tbl->lock);
neigh_dbg(2, "neigh %p is created\n", n);
rc = n;
@@ -1002,6 +1036,7 @@ static void neigh_periodic_work(struct work_struct *work)
rcu_assign_pointer(*np,
rcu_dereference_protected(n->next,
lockdep_is_held(&tbl->lock)));
+ hlist_del_rcu(&n->hash);
neigh_mark_dead(n);
write_unlock(&n->lock);
neigh_cleanup_and_release(n);
@@ -3131,6 +3166,7 @@ void __neigh_for_each_release(struct neigh_table *tbl,
rcu_assign_pointer(*np,
rcu_dereference_protected(n->next,
lockdep_is_held(&tbl->lock)));
+ hlist_del_rcu(&n->hash);
neigh_mark_dead(n);
} else
np = &n->next;
--
2.46.0
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