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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/buffer.h
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/buffer.h')
-rw-r--r--src/vnet/buffer.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/vnet/buffer.h b/src/vnet/buffer.h
index 2f2524590e9..144f62ac17a 100644
--- a/src/vnet/buffer.h
+++ b/src/vnet/buffer.h
@@ -320,13 +320,13 @@ typedef struct
/* L2 classify */
struct
{
- struct opaque_l2 pad;
+ u32 pad[4]; /* do not overlay w/ ip.fib_index nor l2 */
union
{
u32 table_index;
u32 opaque_index;
};
- u64 hash;
+ u32 hash;
} l2_classify;
/* vnet policer */