diff options
| author |   Mohsin Kazmi <sykazmi@cisco.com> | 2018-11-20 11:11:12 +0100 |
|---|---|---|
| committer |   Dave Barach <openvpp@barachs.net> | 2018-11-26 17:07:48 +0000 |
| commit | 2af0e3a74c40e5df946813324574ccc18feb4761 (patch) | |
| tree | fffbb9995f1cd0413d9de78cf779356cfdf8e5f7 /src/vnet/ip/ip4.h | |
| parent | ab11ec9ab94ffdf164daa2b5006dab4e388a966e (diff) | |
flow-hash: Add symmetric flag for flow hashing
When 'Symmetric' flag is enabled, it will sort the addresses
and hence, same flow hash will be calculated on both directions.
Change-Id: I5d846f8d0b94ca1121e03d15b02bb56edb5887b1
Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>
Diffstat (limited to 'src/vnet/ip/ip4.h')
| -rw-r--r-- | src/vnet/ip/ip4.h | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/src/vnet/ip/ip4.h b/src/vnet/ip/ip4.h index 9cb54bdfc41..31ca10feece 100644 --- a/src/vnet/ip/ip4.h +++ b/src/vnet/ip/ip4.h @@ -308,7 +308,6 @@ ip4_compute_flow_hash (const ip4_header_t * ip, a = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t2 : t1; b = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? t1 : t2; - b ^= (flow_hash_config & IP_FLOW_HASH_PROTO) ? ip->protocol : 0; t1 = is_tcp_udp ? tcp->src : 0; t2 = is_tcp_udp ? tcp->dst : 0; @@ -316,6 +315,23 @@ ip4_compute_flow_hash (const ip4_header_t * ip, t1 = (flow_hash_config & IP_FLOW_HASH_SRC_PORT) ? t1 : 0; t2 = (flow_hash_config & IP_FLOW_HASH_DST_PORT) ? t2 : 0; + if (flow_hash_config & IP_FLOW_HASH_SYMMETRIC) + { + if (b < a) + { + c = a; + a = b; + b = c; + } + if (t2 < t1) + { + t2 += t1; + t1 = t2 - t1; + t2 = t2 - t1; + } + } + + b ^= (flow_hash_config & IP_FLOW_HASH_PROTO) ? ip->protocol : 0; c = (flow_hash_config & IP_FLOW_HASH_REVERSE_SRC_DST) ? (t1 << 16) | t2 : (t2 << 16) | t1; |