+/* Initialize a flow with random fields that matter for nx_hash_fields. */
+void
+flow_random_hash_fields(struct flow *flow)
+{
+ uint16_t rnd = random_uint16();
+
+ /* Initialize to all zeros. */
+ memset(flow, 0, sizeof *flow);
+
+ eth_addr_random(flow->dl_src);
+ eth_addr_random(flow->dl_dst);
+
+ flow->vlan_tci = (OVS_FORCE ovs_be16) (random_uint16() & VLAN_VID_MASK);
+
+ /* Make most of the random flows IPv4, some IPv6, and rest random. */
+ flow->dl_type = rnd < 0x8000 ? htons(ETH_TYPE_IP) :
+ rnd < 0xc000 ? htons(ETH_TYPE_IPV6) : (OVS_FORCE ovs_be16)rnd;
+
+ if (dl_type_is_ip_any(flow->dl_type)) {
+ if (flow->dl_type == htons(ETH_TYPE_IP)) {
+ flow->nw_src = (OVS_FORCE ovs_be32)random_uint32();
+ flow->nw_dst = (OVS_FORCE ovs_be32)random_uint32();
+ } else {
+ random_bytes(&flow->ipv6_src, sizeof flow->ipv6_src);
+ random_bytes(&flow->ipv6_dst, sizeof flow->ipv6_dst);
+ }
+ /* Make most of IP flows TCP, some UDP or SCTP, and rest random. */
+ rnd = random_uint16();
+ flow->nw_proto = rnd < 0x8000 ? IPPROTO_TCP :
+ rnd < 0xc000 ? IPPROTO_UDP :
+ rnd < 0xd000 ? IPPROTO_SCTP : (uint8_t)rnd;
+ if (flow->nw_proto == IPPROTO_TCP ||
+ flow->nw_proto == IPPROTO_UDP ||
+ flow->nw_proto == IPPROTO_SCTP) {
+ flow->tp_src = (OVS_FORCE ovs_be16)random_uint16();
+ flow->tp_dst = (OVS_FORCE ovs_be16)random_uint16();
+ }
+ }
+}
+
+/* Masks the fields in 'wc' that are used by the flow hash 'fields'. */
+void
+flow_mask_hash_fields(const struct flow *flow, struct flow_wildcards *wc,
+ enum nx_hash_fields fields)
+{
+ switch (fields) {
+ case NX_HASH_FIELDS_ETH_SRC:
+ memset(&wc->masks.dl_src, 0xff, sizeof wc->masks.dl_src);
+ break;
+
+ case NX_HASH_FIELDS_SYMMETRIC_L4:
+ memset(&wc->masks.dl_src, 0xff, sizeof wc->masks.dl_src);
+ memset(&wc->masks.dl_dst, 0xff, sizeof wc->masks.dl_dst);
+ if (flow->dl_type == htons(ETH_TYPE_IP)) {
+ memset(&wc->masks.nw_src, 0xff, sizeof wc->masks.nw_src);
+ memset(&wc->masks.nw_dst, 0xff, sizeof wc->masks.nw_dst);
+ } else if (flow->dl_type == htons(ETH_TYPE_IPV6)) {
+ memset(&wc->masks.ipv6_src, 0xff, sizeof wc->masks.ipv6_src);
+ memset(&wc->masks.ipv6_dst, 0xff, sizeof wc->masks.ipv6_dst);
+ }
+ if (is_ip_any(flow)) {
+ memset(&wc->masks.nw_proto, 0xff, sizeof wc->masks.nw_proto);
+ memset(&wc->masks.tp_src, 0xff, sizeof wc->masks.tp_src);
+ memset(&wc->masks.tp_dst, 0xff, sizeof wc->masks.tp_dst);
+ }
+ wc->masks.vlan_tci |= htons(VLAN_VID_MASK | VLAN_CFI);
+ break;
+
+ default:
+ NOT_REACHED();
+ }
+}
+