1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2010-2011 Juniper Networks, Inc.
5 * All rights reserved.
6 *
7 * This software was developed by Robert N. M. Watson under contract
8 * to Juniper Networks, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33
34 __FBSDID("$FreeBSD$");
35
36 #include "opt_inet6.h"
37 #include "opt_rss.h"
38
39 #include <sys/param.h>
40 #include <sys/mbuf.h>
41 #include <sys/socket.h>
42
43 #include <net/rss_config.h>
44
45 #include <netinet/in.h>
46 #include <netinet/in_pcb.h>
47 #ifdef INET6
48 #include <netinet6/in6_pcb.h>
49 #include <netinet6/in6_rss.h>
50 #endif /* INET6 */
51
52 /*
53 * Given a hash of whatever the covered tuple might be, return a pcbgroup
54 * index. Where RSS is supported, try to align bucket selection with RSS CPU
55 * affinity strategy.
56 */
57 static __inline u_int
in6_pcbgroup_getbucket(struct inpcbinfo * pcbinfo,uint32_t hash)58 in6_pcbgroup_getbucket(struct inpcbinfo *pcbinfo, uint32_t hash)
59 {
60
61 #ifdef RSS
62 return (rss_getbucket(hash));
63 #else
64 return (hash % pcbinfo->ipi_npcbgroups);
65 #endif
66 }
67
68 /*
69 * Map a (hashtype, hash) tuple into a connection group, or NULL if the hash
70 * information is insufficient to identify the pcbgroup. This might occur if
71 * a TCP packet turnsup with a 2-tuple hash, or if an RSS hash is present but
72 * RSS is not compiled into the kernel.
73 */
74 struct inpcbgroup *
in6_pcbgroup_byhash(struct inpcbinfo * pcbinfo,u_int hashtype,uint32_t hash)75 in6_pcbgroup_byhash(struct inpcbinfo *pcbinfo, u_int hashtype, uint32_t hash)
76 {
77
78 #ifdef RSS
79 if ((pcbinfo->ipi_hashfields == IPI_HASHFIELDS_4TUPLE &&
80 hashtype == M_HASHTYPE_RSS_TCP_IPV6) ||
81 (pcbinfo->ipi_hashfields == IPI_HASHFIELDS_4TUPLE &&
82 hashtype == M_HASHTYPE_RSS_UDP_IPV6) ||
83 (pcbinfo->ipi_hashfields == IPI_HASHFIELDS_2TUPLE &&
84 hashtype == M_HASHTYPE_RSS_IPV6))
85 return (&pcbinfo->ipi_pcbgroups[
86 in6_pcbgroup_getbucket(pcbinfo, hash)]);
87 #endif
88 return (NULL);
89 }
90
91 struct inpcbgroup *
in6_pcbgroup_bymbuf(struct inpcbinfo * pcbinfo,struct mbuf * m)92 in6_pcbgroup_bymbuf(struct inpcbinfo *pcbinfo, struct mbuf *m)
93 {
94
95 return (in6_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m),
96 m->m_pkthdr.flowid));
97 }
98
99 struct inpcbgroup *
in6_pcbgroup_bytuple(struct inpcbinfo * pcbinfo,const struct in6_addr * laddrp,u_short lport,const struct in6_addr * faddrp,u_short fport)100 in6_pcbgroup_bytuple(struct inpcbinfo *pcbinfo, const struct in6_addr *laddrp,
101 u_short lport, const struct in6_addr *faddrp, u_short fport)
102 {
103 uint32_t hash;
104
105 /*
106 * RSS note: we pass foreign addr/port as source, and local addr/port
107 * as destination, as we want to align with what the hardware is
108 * doing.
109 */
110 switch (pcbinfo->ipi_hashfields) {
111 case IPI_HASHFIELDS_4TUPLE:
112 #ifdef RSS
113 hash = rss_hash_ip6_4tuple(faddrp, fport, laddrp, lport);
114 #else
115 hash = faddrp->s6_addr32[3] ^ fport;
116 #endif
117 break;
118
119 case IPI_HASHFIELDS_2TUPLE:
120 #ifdef RSS
121 hash = rss_hash_ip6_2tuple(faddrp, laddrp);
122 #else
123 hash = faddrp->s6_addr32[3] ^ laddrp->s6_addr32[3];
124 #endif
125 break;
126
127 default:
128 hash = 0;
129 }
130 return (&pcbinfo->ipi_pcbgroups[in6_pcbgroup_getbucket(pcbinfo,
131 hash)]);
132 }
133
134 struct inpcbgroup *
in6_pcbgroup_byinpcb(struct inpcb * inp)135 in6_pcbgroup_byinpcb(struct inpcb *inp)
136 {
137
138 #ifdef RSS
139 /*
140 * Listen sockets with INP_RSS_BUCKET_SET set have a pre-determined
141 * RSS bucket and thus we should use this pcbgroup, rather than
142 * using a tuple or hash.
143 *
144 * XXX should verify that there's actually pcbgroups and inp_rss_listen_bucket
145 * fits in that!
146 */
147 if (inp->inp_flags2 & INP_RSS_BUCKET_SET)
148 return (&inp->inp_pcbinfo->ipi_pcbgroups[inp->inp_rss_listen_bucket]);
149 #endif
150
151 return (in6_pcbgroup_bytuple(inp->inp_pcbinfo, &inp->in6p_laddr,
152 inp->inp_lport, &inp->in6p_faddr, inp->inp_fport));
153 }
154