Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/in6_rss.c
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1 /*- 2 * Copyright (c) 2010-2011 Juniper Networks, Inc. 3 * All rights reserved. 4 * 5 * This software was developed by Robert N. M. Watson under contract 6 * to Juniper Networks, Inc. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 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. 16 * 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 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 32 __FBSDID("$FreeBSD$"); 33 34 #include "opt_inet6.h" 35 36 #include <sys/param.h> 37 #include <sys/mbuf.h> 38 #include <sys/socket.h> 39 #include <sys/priv.h> 40 #include <sys/kernel.h> 41 #include <sys/smp.h> 42 #include <sys/sysctl.h> 43 #include <sys/sbuf.h> 44 45 #include <net/if.h> 46 #include <net/if_var.h> 47 #include <net/netisr.h> 48 #include <net/rss_config.h> 49 50 #include <netinet/in.h> 51 #include <netinet/in_pcb.h> 52 #include <netinet6/in6_rss.h> 53 #include <netinet/in_var.h> 54 55 /* for software rss hash support */ 56 #include <netinet/ip6.h> 57 #include <netinet6/ip6_var.h> 58 #include <netinet/tcp.h> 59 #include <netinet/udp.h> 60 61 /* 62 * Hash an IPv6 2-tuple. 63 */ 64 uint32_t 65 rss_hash_ip6_2tuple(const struct in6_addr *src, const struct in6_addr *dst) 66 { 67 uint8_t data[sizeof(*src) + sizeof(*dst)]; 68 u_int datalen; 69 70 datalen = 0; 71 bcopy(src, &data[datalen], sizeof(*src)); 72 datalen += sizeof(*src); 73 bcopy(dst, &data[datalen], sizeof(*dst)); 74 datalen += sizeof(*dst); 75 return (rss_hash(datalen, data)); 76 } 77 78 /* 79 * Hash an IPv6 4-tuple. 80 */ 81 uint32_t 82 rss_hash_ip6_4tuple(const struct in6_addr *src, u_short srcport, 83 const struct in6_addr *dst, u_short dstport) 84 { 85 uint8_t data[sizeof(*src) + sizeof(*dst) + sizeof(srcport) + 86 sizeof(dstport)]; 87 u_int datalen; 88 89 datalen = 0; 90 bcopy(src, &data[datalen], sizeof(*src)); 91 datalen += sizeof(*src); 92 bcopy(dst, &data[datalen], sizeof(*dst)); 93 datalen += sizeof(*dst); 94 bcopy(&srcport, &data[datalen], sizeof(srcport)); 95 datalen += sizeof(srcport); 96 bcopy(&dstport, &data[datalen], sizeof(dstport)); 97 datalen += sizeof(dstport); 98 return (rss_hash(datalen, data)); 99 } 100 101 /* 102 * Calculate an appropriate ipv6 2-tuple or 4-tuple given the given 103 * IPv6 source/destination address, UDP or TCP source/destination ports 104 * and the protocol type. 105 * 106 * The protocol code may wish to do a software hash of the given 107 * tuple. This depends upon the currently configured RSS hash types. 108 * 109 * This assumes that the packet in question isn't a fragment. 110 * 111 * It also assumes the packet source/destination address 112 * are in "incoming" packet order (ie, source is "far" address.) 113 */ 114 int 115 rss_proto_software_hash_v6(const struct in6_addr *s, const struct in6_addr *d, 116 u_short sp, u_short dp, int proto, 117 uint32_t *hashval, uint32_t *hashtype) 118 { 119 uint32_t hash; 120 121 /* 122 * Next, choose the hash type depending upon the protocol 123 * identifier. 124 */ 125 if ((proto == IPPROTO_TCP) && 126 (rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6)) { 127 hash = rss_hash_ip6_4tuple(s, sp, d, dp); 128 *hashval = hash; 129 *hashtype = M_HASHTYPE_RSS_TCP_IPV6; 130 return (0); 131 } else if ((proto == IPPROTO_UDP) && 132 (rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6)) { 133 hash = rss_hash_ip6_4tuple(s, sp, d, dp); 134 *hashval = hash; 135 *hashtype = M_HASHTYPE_RSS_UDP_IPV6; 136 return (0); 137 } else if (rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) { 138 /* RSS doesn't hash on other protocols like SCTP; so 2-tuple */ 139 hash = rss_hash_ip6_2tuple(s, d); 140 *hashval = hash; 141 *hashtype = M_HASHTYPE_RSS_IPV6; 142 return (0); 143 } 144 145 /* No configured available hashtypes! */ 146 RSS_DEBUG("no available hashtypes!\n"); 147 return (-1); 148 } 149 150 /* 151 * Calculate an appropriate ipv6 2-tuple or 4-tuple given the given 152 * IPv6 source/destination address, UDP or TCP source/destination ports 153 * and the protocol type. 154 * 155 * The protocol code may wish to do a software hash of the given 156 * tuple. This depends upon the currently configured RSS hash types. 157 * 158 * It assumes the packet source/destination address 159 * are in "outgoin" packet order (ie, destination is "far" address.) 160 */ 161 uint32_t 162 xps_proto_software_hash_v6(const struct in6_addr *s, const struct in6_addr *d, 163 u_short sp, u_short dp, int proto, uint32_t *hashtype) 164 { 165 166 uint32_t hash; 167 168 /* 169 * Next, choose the hash type depending upon the protocol 170 * identifier. 171 */ 172 if ((proto == IPPROTO_TCP) && 173 (rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6)) { 174 hash = rss_hash_ip6_4tuple(d, dp, s, sp); 175 *hashtype = M_HASHTYPE_RSS_TCP_IPV6; 176 return (hash); 177 } else if ((proto == IPPROTO_UDP) && 178 (rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6)) { 179 hash = rss_hash_ip6_4tuple(d, dp, s, sp); 180 *hashtype = M_HASHTYPE_RSS_UDP_IPV6; 181 return (hash); 182 } else if (rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) { 183 /* RSS doesn't hash on other protocols like SCTP; so 2-tuple */ 184 hash = rss_hash_ip6_2tuple(d, s); 185 *hashtype = M_HASHTYPE_RSS_IPV6; 186 return (hash); 187 } 188 189 *hashtype = M_HASHTYPE_NONE; 190 return (0); 191 } 192 193 194 /* 195 * Do a software calculation of the RSS for the given mbuf. 196 * 197 * This is typically used by the input path to recalculate the RSS after 198 * some form of packet processing (eg de-capsulation, IP fragment reassembly.) 199 * 200 * dir is the packet direction - RSS_HASH_PKT_INGRESS for incoming and 201 * RSS_HASH_PKT_EGRESS for outgoing. 202 * 203 * Returns 0 if a hash was done, -1 if no hash was done, +1 if 204 * the mbuf already had a valid RSS flowid. 205 * 206 * This function doesn't modify the mbuf. It's up to the caller to 207 * assign flowid/flowtype as appropriate. 208 */ 209 int 210 rss_mbuf_software_hash_v6(const struct mbuf *m, int dir, uint32_t *hashval, 211 uint32_t *hashtype) 212 { 213 const struct ip6_hdr *ip6; 214 const struct ip6_frag *ip6f; 215 const struct tcphdr *th; 216 const struct udphdr *uh; 217 uint32_t flowtype; 218 uint8_t proto; 219 int off, newoff; 220 int nxt; 221 222 /* 223 * XXX For now this only handles hashing on incoming mbufs. 224 */ 225 if (dir != RSS_HASH_PKT_INGRESS) { 226 RSS_DEBUG("called on EGRESS packet!\n"); 227 return (-1); 228 } 229 230 off = sizeof(struct ip6_hdr); 231 232 /* 233 * First, validate that the mbuf we have is long enough 234 * to have an IPv6 header in it. 235 */ 236 if (m->m_pkthdr.len < off) { 237 RSS_DEBUG("short mbuf pkthdr\n"); 238 return (-1); 239 } 240 if (m->m_len < off) { 241 RSS_DEBUG("short mbuf len\n"); 242 return (-1); 243 } 244 245 /* Ok, let's dereference that */ 246 ip6 = mtod(m, struct ip6_hdr *); 247 proto = ip6->ip6_nxt; 248 249 /* 250 * Find the beginning of the TCP/UDP header. 251 * 252 * If this is a fragment then it shouldn't be four-tuple 253 * hashed just yet. Once it's reassembled into a full 254 * frame it should be re-hashed. 255 */ 256 while (proto != IPPROTO_FRAGMENT) { 257 newoff = ip6_nexthdr(m, off, proto, &nxt); 258 if (newoff < 0) 259 break; 260 off = newoff; 261 proto = nxt; 262 } 263 264 /* 265 * Ignore the fragment header if this is an "atomic" fragment 266 * (offset and m bit set to 0) 267 */ 268 if (proto == IPPROTO_FRAGMENT) { 269 if (m->m_len < off + sizeof(struct ip6_frag)) { 270 RSS_DEBUG("short fragment frame?\n"); 271 return (-1); 272 } 273 ip6f = (const struct ip6_frag *)((c_caddr_t)ip6 + off); 274 if ((ip6f->ip6f_offlg & ~IP6F_RESERVED_MASK) == 0) { 275 off = ip6_lasthdr(m, off, proto, &nxt); 276 if (off < 0) { 277 RSS_DEBUG("invalid extension header\n"); 278 return (-1); 279 } 280 proto = nxt; 281 } 282 } 283 284 /* 285 * If the mbuf flowid/flowtype matches the packet type, 286 * and we don't support the 4-tuple version of the given protocol, 287 * then signal to the owner that it can trust the flowid/flowtype 288 * details. 289 * 290 * This is a little picky - eg, if TCPv6 / UDPv6 hashing 291 * is supported but we got a TCP/UDP frame only 2-tuple hashed, 292 * then we shouldn't just "trust" the 2-tuple hash. We need 293 * a 4-tuple hash. 294 */ 295 flowtype = M_HASHTYPE_GET(m); 296 297 if (flowtype != M_HASHTYPE_NONE) { 298 switch (proto) { 299 case IPPROTO_UDP: 300 if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6) && 301 (flowtype == M_HASHTYPE_RSS_UDP_IPV6)) { 302 return (1); 303 } 304 /* 305 * Only allow 2-tuple for UDP frames if we don't also 306 * support 4-tuple for UDP. 307 */ 308 if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) && 309 ((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6) == 0) && 310 flowtype == M_HASHTYPE_RSS_IPV6) { 311 return (1); 312 } 313 break; 314 case IPPROTO_TCP: 315 if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6) && 316 (flowtype == M_HASHTYPE_RSS_TCP_IPV6)) { 317 return (1); 318 } 319 /* 320 * Only allow 2-tuple for TCP frames if we don't also 321 * support 4-tuple for TCP. 322 */ 323 if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) && 324 ((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6) == 0) && 325 flowtype == M_HASHTYPE_RSS_IPV6) { 326 return (1); 327 } 328 break; 329 default: 330 if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) && 331 flowtype == M_HASHTYPE_RSS_IPV6) { 332 return (1); 333 } 334 break; 335 } 336 } 337 338 /* 339 * Decode enough information to make a hash decision. 340 */ 341 if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6) && 342 (proto == IPPROTO_TCP)) { 343 if (m->m_len < off + sizeof(struct tcphdr)) { 344 RSS_DEBUG("short TCP frame?\n"); 345 return (-1); 346 } 347 th = (const struct tcphdr *)((c_caddr_t)ip6 + off); 348 return rss_proto_software_hash_v6(&ip6->ip6_src, &ip6->ip6_dst, 349 th->th_sport, 350 th->th_dport, 351 proto, 352 hashval, 353 hashtype); 354 } else if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6) && 355 (proto == IPPROTO_UDP)) { 356 if (m->m_len < off + sizeof(struct udphdr)) { 357 RSS_DEBUG("short UDP frame?\n"); 358 return (-1); 359 } 360 uh = (const struct udphdr *)((c_caddr_t)ip6 + off); 361 return rss_proto_software_hash_v6(&ip6->ip6_src, &ip6->ip6_dst, 362 uh->uh_sport, 363 uh->uh_dport, 364 proto, 365 hashval, 366 hashtype); 367 } else if (rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) { 368 /* Default to 2-tuple hash */ 369 return rss_proto_software_hash_v6(&ip6->ip6_src, &ip6->ip6_dst, 370 0, /* source port */ 371 0, /* destination port */ 372 0, /* IPPROTO_IP */ 373 hashval, 374 hashtype); 375 } else { 376 RSS_DEBUG("no available hashtypes!\n"); 377 return (-1); 378 } 379 } 380 381 /* 382 * Similar to rss_m2cpuid, but designed to be used by the IPv6 NETISR 383 * on incoming frames. 384 * 385 * If an existing RSS hash exists and it matches what the configured 386 * hashing is, then use it. 387 * 388 * If there's an existing RSS hash but the desired hash is different, 389 * or if there's no useful RSS hash, then calculate it via 390 * the software path. 391 * 392 * XXX TODO: definitely want statistics here! 393 */ 394 struct mbuf * 395 rss_soft_m2cpuid_v6(struct mbuf *m, uintptr_t source, u_int *cpuid) 396 { 397 uint32_t hash_val, hash_type; 398 int ret; 399 400 M_ASSERTPKTHDR(m); 401 402 ret = rss_mbuf_software_hash_v6(m, RSS_HASH_PKT_INGRESS, 403 &hash_val, &hash_type); 404 if (ret > 0) { 405 /* mbuf has a valid hash already; don't need to modify it */ 406 *cpuid = rss_hash2cpuid(m->m_pkthdr.flowid, M_HASHTYPE_GET(m)); 407 } else if (ret == 0) { 408 /* hash was done; update */ 409 m->m_pkthdr.flowid = hash_val; 410 M_HASHTYPE_SET(m, hash_type); 411 *cpuid = rss_hash2cpuid(m->m_pkthdr.flowid, M_HASHTYPE_GET(m)); 412 } else { /* ret < 0 */ 413 /* no hash was done */ 414 *cpuid = NETISR_CPUID_NONE; 415 } 416 return (m); 417 }
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