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bpf: hash: move select_bucket() out of htab's spinlock 

The spinlock is just used for protecting the per-bucket
hlist, so it isn't needed for selecting bucket.

Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
tom.leiming@gmail.com 2015-12-29 22:40:26 +08:00 committed by David S. Miller
parent 6591f1e666
commit 45d8390c56
1 changed files with 2 additions and 4 deletions
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6
kernel/bpf/hashtab.c
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@ -248,12 +248,11 @@ static int htab_map_update_elem(struct bpf_map *map, void *key, void *value,
memcpy(l_new->key + round_up(key_size, 8), value, map->value_size);
l_new->hash = htab_map_hash(l_new->key, key_size);
head = select_bucket(htab, l_new->hash);
/* bpf_map_update_elem() can be called in_irq() */
raw_spin_lock_irqsave(&htab->lock, flags);
head = select_bucket(htab, l_new->hash);
l_old = lookup_elem_raw(head, l_new->hash, key, key_size);
if (!l_old && unlikely(atomic_read(&htab->count) >= map->max_entries)) {
@ -310,11 +309,10 @@ static int htab_map_delete_elem(struct bpf_map *map, void *key)
key_size = map->key_size;
hash = htab_map_hash(key, key_size);
head = select_bucket(htab, hash);
raw_spin_lock_irqsave(&htab->lock, flags);
head = select_bucket(htab, hash);
l = lookup_elem_raw(head, hash, key, key_size);
if (l) {