-/*
- * Compute flow hash.
- * We'll use it to select which adjacency to use for this flow. And other things.
- */
-always_inline u32
-mpls_compute_flow_hash (const mpls_unicast_header_t * hdr,
- flow_hash_config_t flow_hash_config)
-{
- /*
- * We need to byte swap so we use the numerical value. i.e. an odd label
- * leads to an odd bucket. as opposed to a label above and below value X.
- */
- u8 next_label_is_entropy;
- mpls_label_t ho_label;
- u32 hash, value;
-
- ho_label = clib_net_to_host_u32(hdr->label_exp_s_ttl);
- hash = vnet_mpls_uc_get_label(ho_label);
- next_label_is_entropy = 0;
-
- while (MPLS_EOS != vnet_mpls_uc_get_s(ho_label))
- {
- hdr++;
- ho_label = clib_net_to_host_u32(hdr->label_exp_s_ttl);
- value = vnet_mpls_uc_get_label(ho_label);
-
- if (1 == next_label_is_entropy)
- {
- /*
- * The label is an entropy value, use it alone as the hash
- */
- return (ho_label);
- }
- if (MPLS_IETF_ENTROPY_LABEL == value)
- {
- /*
- * we've met a label in the stack indicating that tha next
- * label is an entropy value
- */
- next_label_is_entropy = 1;
- }
- else
- {
- /*
- * XOR the label values in the stack together to
- * build up the hash value
- */
- hash ^= value;
- }
- }
-
- /*
- * check the top nibble for v4 and v6
- */
- hdr++;
-
- switch (((u8*)hdr)[0] >> 4)
- {
- case 4:
- /* incorporate the v4 flow-hash */
- hash ^= ip4_compute_flow_hash ((const ip4_header_t *)hdr,
- IP_FLOW_HASH_DEFAULT);
- break;
- case 6:
- /* incorporate the v6 flow-hash */
- hash ^= ip6_compute_flow_hash ((const ip6_header_t *)hdr,
- IP_FLOW_HASH_DEFAULT);
- break;
- default:
- break;
- }
-
- return (hash);
-}
-
-static inline uword
-mpls_lookup (vlib_main_t * vm,