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authorBenoît Ganne <bganne@cisco.com>2022-06-08 10:49:17 +0200
committerDamjan Marion <dmarion@0xa5.net>2022-06-29 21:23:38 +0000
commitb03eec969f3db186fc354c3e885e51c0b24803f0 (patch)
tree54871a6dc00bad0644f75755d616f10ad67de6c2 /src/vnet/l2/l2_input_classify.c
parentb0057282d64a4f9ac5966fceb427057b0665b772 (diff)
classify: use 32 bits hash
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 <bganne@cisco.com>
Diffstat (limited to 'src/vnet/l2/l2_input_classify.c')
-rw-r--r--src/vnet/l2/l2_input_classify.c9
1 files changed, 4 insertions, 5 deletions
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;