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Index: head/sys/netinet6/in6_rss.h
===================================================================
--- head/sys/netinet6/in6_rss.h
+++ head/sys/netinet6/in6_rss.h
@@ -42,4 +42,12 @@
uint32_t rss_hash_ip6_2tuple(const struct in6_addr *src,
const struct in6_addr *dst);
+/*
+ * Functions to calculate a software RSS hash for a given mbuf or
+ * packet detail.
+ */
+int rss_proto_software_hash_v6(const struct in6_addr *src,
+ const struct in6_addr *dst, u_short src_port,
+ u_short dst_port, int proto, uint32_t *hashval,
+ uint32_t *hashtype);
#endif /* !_NETINET6_IN6_RSS_H_ */
Index: head/sys/netinet6/in6_rss.c
===================================================================
--- head/sys/netinet6/in6_rss.c
+++ head/sys/netinet6/in6_rss.c
@@ -101,3 +101,52 @@
datalen += sizeof(dstport);
return (rss_hash(datalen, data));
}
+
+/*
+ * Calculate an appropriate ipv6 2-tuple or 4-tuple given the given
+ * IPv6 source/destination address, UDP or TCP source/destination ports
+ * and the protocol type.
+ *
+ * The protocol code may wish to do a software hash of the given
+ * tuple. This depends upon the currently configured RSS hash types.
+ *
+ * This assumes that the packet in question isn't a fragment.
+ *
+ * It also assumes the packet source/destination address
+ * are in "incoming" packet order (ie, source is "far" address.)
+ */
+int
+rss_proto_software_hash_v6(const struct in6_addr *s, const struct in6_addr *d,
+ u_short sp, u_short dp, int proto,
+ uint32_t *hashval, uint32_t *hashtype)
+{
+ uint32_t hash;
+
+ /*
+ * Next, choose the hash type depending upon the protocol
+ * identifier.
+ */
+ if ((proto == IPPROTO_TCP) &&
+ (rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6)) {
+ hash = rss_hash_ip6_4tuple(s, sp, d, dp);
+ *hashval = hash;
+ *hashtype = M_HASHTYPE_RSS_TCP_IPV6;
+ return (0);
+ } else if ((proto == IPPROTO_UDP) &&
+ (rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6)) {
+ hash = rss_hash_ip6_4tuple(s, sp, d, dp);
+ *hashval = hash;
+ *hashtype = M_HASHTYPE_RSS_UDP_IPV6;
+ return (0);
+ } else if (rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) {
+ /* RSS doesn't hash on other protocols like SCTP; so 2-tuple */
+ hash = rss_hash_ip6_2tuple(s, d);
+ *hashval = hash;
+ *hashtype = M_HASHTYPE_RSS_IPV6;
+ return (0);
+ }
+
+ /* No configured available hashtypes! */
+ printf("%s: no available hashtypes!\n", __func__);
+ return (-1);
+}

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