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authorMohsin Kazmi <sykazmi@cisco.com>2018-11-20 11:11:12 +0100
committerDave Barach <openvpp@barachs.net>2018-11-26 17:07:48 +0000
commit2af0e3a74c40e5df946813324574ccc18feb4761 (patch)
treefffbb9995f1cd0413d9de78cf779356cfdf8e5f7 /src/vnet/ip/ip4.h
parentab11ec9ab94ffdf164daa2b5006dab4e388a966e (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.h18
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;