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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>
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1 changed files with 6 additions and 1 deletions
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@ -363,12 +363,17 @@ static void nft_rhash_destroy(const struct nft_set *set)
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(void *)set);
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}
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static u32 nft_hash_buckets(u32 size)
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{
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return roundup_pow_of_two(size * 4 / 3);
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}
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static bool nft_rhash_estimate(const struct nft_set_desc *desc, u32 features,
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struct nft_set_estimate *est)
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{
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if (desc->size)
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est->size = sizeof(struct nft_rhash) +
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roundup_pow_of_two(desc->size * 4 / 3) *
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nft_hash_buckets(desc->size) *
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sizeof(struct nft_rhash_elem *) +
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desc->size * sizeof(struct nft_rhash_elem);
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else
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