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_input_classify.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) (limited to 'src/vnet/l2/l2_input_classify.c') diff --git a/src/vnet/l2/l2_input_classify.c b/src/vnet/l2/l2_input_classify.c index 53d46399daf..d33a0810d28 100644 --- a/src/vnet/l2/l2_input_classify.c +++ b/src/vnet/l2/l2_input_classify.c @@ -179,8 +179,7 @@ VLIB_NODE_FN (l2_input_classify_node) (vlib_main_t * vm, int type_index0, type_index1; vnet_classify_table_t *t0, *t1; u32 table_index0, table_index1; - u64 hash0, hash1; - + u32 hash0, hash1; /* prefetch next iteration */ { @@ -265,7 +264,7 @@ VLIB_NODE_FN (l2_input_classify_node) (vlib_main_t * vm, u32 type_index0; vnet_classify_table_t *t0; u32 table_index0; - u64 hash0; + u32 hash0; bi0 = from[0]; b0 = vlib_get_buffer (vm, bi0); @@ -316,14 +315,14 @@ VLIB_NODE_FN (l2_input_classify_node) (vlib_main_t * vm, u32 next0 = ~0; /* next l2 input feature, please... */ ethernet_header_t *h0; u32 table_index0; - u64 hash0; + u32 hash0; vnet_classify_table_t *t0; vnet_classify_entry_t *e0; if (PREDICT_TRUE (n_left_from > 2)) { vlib_buffer_t *p2 = vlib_get_buffer (vm, from[2]); - u64 phash2; + u32 phash2; u32 table_index2; vnet_classify_table_t *tp2; -- cgit 1.2.3-korg