[PATCH 15/29] netfilter: nft_set_hash: add nft_hash_buckets()
From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: 2017-06-29 22:53:55
Also in:
netfilter-devel
Subsystem:
netfilter, networking [general], the rest · Maintainers:
Pablo Neira Ayuso, Florian Westphal, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
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> --- net/netfilter/nft_set_hash.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
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
--
2.1.4