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@xxxxxxxxxxxxx>
---
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
--
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