From b03eec969f3db186fc354c3e885e51c0b24803f0 Mon Sep 17 00:00:00 2001 From: Benoît Ganne Date: Wed, 8 Jun 2022 10:49:17 +0200 Subject: classify: use 32 bits hash MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit classify hash used to be stored as u64 in buffer metadata, use 32 bits instead: - on almost all our supported arch (x86 and arm64) we use crc32c intrinsics to compute the final hash: we really get a 32-bits hash - the hash itself is used to compute a 32-bits bucket index by masking upper bits: we always discard the higher 32-bits - this allows to increase the l2 classify buffer metadata padding such as it does not overlap with the ip fib_index metadata anymore. This overlap is an issue when using the 'set metadata' action in the ip ACL node which updates both fields Type: fix Change-Id: I5d35bdae97b96c3cae534e859b63950fb500ff50 Signed-off-by: Benoît Ganne --- src/vnet/l2/l2_in_out_acl.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'src/vnet/l2/l2_in_out_acl.c') diff --git a/src/vnet/l2/l2_in_out_acl.c b/src/vnet/l2/l2_in_out_acl.c index f8293c1feee..7307a6802a2 100644 --- a/src/vnet/l2/l2_in_out_acl.c +++ b/src/vnet/l2/l2_in_out_acl.c @@ -278,7 +278,7 @@ l2_in_out_acl_node_fn (vlib_main_t * vm, u32 table_index0; vnet_classify_table_t *t0; vnet_classify_entry_t *e0; - u64 hash0; + u32 hash0; u8 *h0; u8 error0; @@ -288,7 +288,7 @@ l2_in_out_acl_node_fn (vlib_main_t * vm, vlib_buffer_t *p1 = vlib_get_buffer (vm, from[3]); vnet_classify_table_t *tp1; u32 table_index1; - u64 phash1; + u32 phash1; table_index1 = vnet_buffer (p1)->l2_classify.table_index; -- cgit 1.2.3-korg