From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pablo Neira Ayuso Subject: [PATCH 15/29] netfilter: nft_set_hash: add nft_hash_buckets() Date: Fri, 30 Jun 2017 00:53:13 +0200 Message-ID: <1498776807-11124-16-git-send-email-pablo@netfilter.org> References: <1498776807-11124-1-git-send-email-pablo@netfilter.org> Cc: davem@davemloft.net, netdev@vger.kernel.org To: netfilter-devel@vger.kernel.org Return-path: In-Reply-To: <1498776807-11124-1-git-send-email-pablo@netfilter.org> Sender: netdev-owner@vger.kernel.org List-Id: netfilter-devel.vger.kernel.org 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 --- 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