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netfilter: nft_set_hash: add nft_hash_buckets()

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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>
This commit is contained in:
Pablo Neira Ayuso 2017-05-22 17:47:56 +01:00
parent 347b408d59
commit 2111515abc
1 changed files with 6 additions and 1 deletions
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7
net/netfilter/nft_set_hash.c
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@ -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