2 * Copyright (c) 2010-2011 Juniper Networks, Inc.
5 * This software was developed by Robert N. M. Watson under contract
6 * to Juniper Networks, Inc.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include "opt_inet6.h"
37 #include <sys/param.h>
40 #include <net/rss_config.h>
42 #include <netinet/in.h>
43 #include <netinet/in_pcb.h>
45 #include <netinet6/in6_pcb.h>
46 #include <netinet6/in6_rss.h>
50 * Given a hash of whatever the covered tuple might be, return a pcbgroup
51 * index. Where RSS is supported, try to align bucket selection with RSS CPU
55 in6_pcbgroup_getbucket(struct inpcbinfo *pcbinfo, uint32_t hash)
59 return (rss_getbucket(hash));
61 return (hash % pcbinfo->ipi_npcbgroups);
66 * Map a (hashtype, hash) tuple into a connection group, or NULL if the hash
67 * information is insufficient to identify the pcbgroup. This might occur if
68 * a TCP packet turnsup with a 2-tuple hash, or if an RSS hash is present but
69 * RSS is not compiled into the kernel.
72 in6_pcbgroup_byhash(struct inpcbinfo *pcbinfo, u_int hashtype, uint32_t hash)
76 if ((pcbinfo->ipi_hashfields == IPI_HASHFIELDS_4TUPLE &&
77 hashtype == M_HASHTYPE_RSS_TCP_IPV6) ||
78 (pcbinfo->ipi_hashfields == IPI_HASHFIELDS_4TUPLE &&
79 hashtype == M_HASHTYPE_RSS_UDP_IPV6) ||
80 (pcbinfo->ipi_hashfields == IPI_HASHFIELDS_2TUPLE &&
81 hashtype == M_HASHTYPE_RSS_IPV6))
82 return (&pcbinfo->ipi_pcbgroups[
83 in6_pcbgroup_getbucket(pcbinfo, hash)]);
89 in6_pcbgroup_bymbuf(struct inpcbinfo *pcbinfo, struct mbuf *m)
92 return (in6_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m),
97 in6_pcbgroup_bytuple(struct inpcbinfo *pcbinfo, const struct in6_addr *laddrp,
98 u_short lport, const struct in6_addr *faddrp, u_short fport)
103 * RSS note: we pass foreign addr/port as source, and local addr/port
104 * as destination, as we want to align with what the hardware is
107 switch (pcbinfo->ipi_hashfields) {
108 case IPI_HASHFIELDS_4TUPLE:
110 hash = rss_hash_ip6_4tuple(faddrp, fport, laddrp, lport);
112 hash = faddrp->s6_addr32[3] ^ fport;
116 case IPI_HASHFIELDS_2TUPLE:
118 hash = rss_hash_ip6_2tuple(faddrp, laddrp);
120 hash = faddrp->s6_addr32[3] ^ laddrp->s6_addr32[3];
127 return (&pcbinfo->ipi_pcbgroups[in6_pcbgroup_getbucket(pcbinfo,
132 in6_pcbgroup_byinpcb(struct inpcb *inp)
137 * Listen sockets with INP_RSS_BUCKET_SET set have a pre-determined
138 * RSS bucket and thus we should use this pcbgroup, rather than
139 * using a tuple or hash.
141 * XXX should verify that there's actually pcbgroups and inp_rss_listen_bucket
144 if (inp->inp_flags2 & INP_RSS_BUCKET_SET)
145 return (&inp->inp_pcbinfo->ipi_pcbgroups[inp->inp_rss_listen_bucket]);
148 return (in6_pcbgroup_bytuple(inp->inp_pcbinfo, &inp->in6p_laddr,
149 inp->inp_lport, &inp->in6p_faddr, inp->inp_fport));