diff options
| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2017-05-22 19:47:56 +0300 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2017-05-29 13:46:19 +0300 |
| commit | 2111515abc46cb3e18b22d8551067029acfd1f55 (patch) | |
| tree | c5d35f1856b9007aa4c2eedd71923cb790cb40f7 /net | |
| parent | 347b408d59e7eadcd09f97eba96fa4c270eb3b23 (diff) | |
| download | linux-2111515abc46cb3e18b22d8551067029acfd1f55.tar.xz | |
netfilter: nft_set_hash: add nft_hash_buckets()
Add nft_hash_buckets() helper function to calculate the number of
hashtable buckets based on the elements. This function can be reused
from the follow up patch to add non-resizable hashtables.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/netfilter/nft_set_hash.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/net/netfilter/nft_set_hash.c b/net/netfilter/nft_set_hash.c index 455a11ce8cd0..466cb7092dfa 100644 --- a/net/netfilter/nft_set_hash.c +++ b/net/netfilter/nft_set_hash.c @@ -363,12 +363,17 @@ static void nft_rhash_destroy(const struct nft_set *set) (void *)set); } +static u32 nft_hash_buckets(u32 size) +{ + return roundup_pow_of_two(size * 4 / 3); +} + static bool nft_rhash_estimate(const struct nft_set_desc *desc, u32 features, struct nft_set_estimate *est) { if (desc->size) est->size = sizeof(struct nft_rhash) + - roundup_pow_of_two(desc->size * 4 / 3) * + nft_hash_buckets(desc->size) * sizeof(struct nft_rhash_elem *) + desc->size * sizeof(struct nft_rhash_elem); else |