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 31 #include "opt_inet6.h" 32 #include "opt_rss.h" 33 34 #include <sys/param.h> 35 #include <sys/mbuf.h> 36 #include <sys/socket.h> 37 #include <sys/priv.h> 38 #include <sys/kernel.h> 39 #include <sys/smp.h> 40 #include <sys/sysctl.h> 41 #include <sys/sbuf.h> 42 43 #include <net/if.h> 44 #include <net/if_var.h> 45 #include <net/netisr.h> 46 #include <net/rss_config.h> 47 48 #include <netinet/in.h> 49 #include <netinet/in_pcb.h> 50 #include <netinet6/in6_rss.h> 51 #include <netinet/in_var.h> 52 53 /* for software rss hash support */ 54 #include <netinet/ip6.h> 55 #include <netinet6/ip6_var.h> 56 #include <netinet/tcp.h> 57 #include <netinet/udp.h> 58 59 /* 60 * Hash an IPv6 2-tuple. 61 */ 62 uint32_t 63 rss_hash_ip6_2tuple(const struct in6_addr *src, const struct in6_addr *dst) 64 { 65 uint8_t data[sizeof(*src) + sizeof(*dst)]; 66 u_int datalen; 67 68 datalen = 0; 69 bcopy(src, &data[datalen], sizeof(*src)); 70 datalen += sizeof(*src); 71 bcopy(dst, &data[datalen], sizeof(*dst)); 72 datalen += sizeof(*dst); 73 return (rss_hash(datalen, data)); 74 } 75 76 /* 77 * Hash an IPv6 4-tuple. 78 */ 79 uint32_t 80 rss_hash_ip6_4tuple(const struct in6_addr *src, u_short srcport, 81 const struct in6_addr *dst, u_short dstport) 82 { 83 uint8_t data[sizeof(*src) + sizeof(*dst) + sizeof(srcport) + 84 sizeof(dstport)]; 85 u_int datalen; 86 87 datalen = 0; 88 bcopy(src, &data[datalen], sizeof(*src)); 89 datalen += sizeof(*src); 90 bcopy(dst, &data[datalen], sizeof(*dst)); 91 datalen += sizeof(*dst); 92 bcopy(&srcport, &data[datalen], sizeof(srcport)); 93 datalen += sizeof(srcport); 94 bcopy(&dstport, &data[datalen], sizeof(dstport)); 95 datalen += sizeof(dstport); 96 return (rss_hash(datalen, data)); 97 } 98 99 /* 100 * Calculate an appropriate ipv6 2-tuple or 4-tuple given the given 101 * IPv6 source/destination address, UDP or TCP source/destination ports 102 * and the protocol type. 103 * 104 * The protocol code may wish to do a software hash of the given 105 * tuple. This depends upon the currently configured RSS hash types. 106 * 107 * This assumes that the packet in question isn't a fragment. 108 * 109 * It also assumes the packet source/destination address 110 * are in "incoming" packet order (ie, source is "far" address.) 111 */ 112 int 113 rss_proto_software_hash_v6(const struct in6_addr *s, const struct in6_addr *d, 114 u_short sp, u_short dp, int proto, 115 uint32_t *hashval, uint32_t *hashtype) 116 { 117 uint32_t hash; 118 119 /* 120 * Next, choose the hash type depending upon the protocol 121 * identifier. 122 */ 123 if ((proto == IPPROTO_TCP) && 124 (rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6)) { 125 hash = rss_hash_ip6_4tuple(s, sp, d, dp); 126 *hashval = hash; 127 *hashtype = M_HASHTYPE_RSS_TCP_IPV6; 128 return (0); 129 } else if ((proto == IPPROTO_UDP) && 130 (rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6)) { 131 hash = rss_hash_ip6_4tuple(s, sp, d, dp); 132 *hashval = hash; 133 *hashtype = M_HASHTYPE_RSS_UDP_IPV6; 134 return (0); 135 } else if (rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) { 136 /* RSS doesn't hash on other protocols like SCTP; so 2-tuple */ 137 hash = rss_hash_ip6_2tuple(s, d); 138 *hashval = hash; 139 *hashtype = M_HASHTYPE_RSS_IPV6; 140 return (0); 141 } 142 143 /* No configured available hashtypes! */ 144 RSS_DEBUG("no available hashtypes!\n"); 145 return (-1); 146 } 147 148 /* 149 * Calculate an appropriate ipv6 2-tuple or 4-tuple given the given 150 * IPv6 source/destination address, UDP or TCP source/destination ports 151 * and the protocol type. 152 * 153 * The protocol code may wish to do a software hash of the given 154 * tuple. This depends upon the currently configured RSS hash types. 155 * 156 * It assumes the packet source/destination address 157 * are in "outgoin" packet order (ie, destination is "far" address.) 158 */ 159 uint32_t 160 xps_proto_software_hash_v6(const struct in6_addr *s, const struct in6_addr *d, 161 u_short sp, u_short dp, int proto, uint32_t *hashtype) 162 { 163 164 uint32_t hash; 165 166 /* 167 * Next, choose the hash type depending upon the protocol 168 * identifier. 169 */ 170 if ((proto == IPPROTO_TCP) && 171 (rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6)) { 172 hash = rss_hash_ip6_4tuple(d, dp, s, sp); 173 *hashtype = M_HASHTYPE_RSS_TCP_IPV6; 174 return (hash); 175 } else if ((proto == IPPROTO_UDP) && 176 (rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6)) { 177 hash = rss_hash_ip6_4tuple(d, dp, s, sp); 178 *hashtype = M_HASHTYPE_RSS_UDP_IPV6; 179 return (hash); 180 } else if (rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) { 181 /* RSS doesn't hash on other protocols like SCTP; so 2-tuple */ 182 hash = rss_hash_ip6_2tuple(d, s); 183 *hashtype = M_HASHTYPE_RSS_IPV6; 184 return (hash); 185 } 186 187 *hashtype = M_HASHTYPE_NONE; 188 return (0); 189 } 190 191 192 /* 193 * Do a software calculation of the RSS for the given mbuf. 194 * 195 * This is typically used by the input path to recalculate the RSS after 196 * some form of packet processing (eg de-capsulation, IP fragment reassembly.) 197 * 198 * dir is the packet direction - RSS_HASH_PKT_INGRESS for incoming and 199 * RSS_HASH_PKT_EGRESS for outgoing. 200 * 201 * Returns 0 if a hash was done, -1 if no hash was done, +1 if 202 * the mbuf already had a valid RSS flowid. 203 * 204 * This function doesn't modify the mbuf. It's up to the caller to 205 * assign flowid/flowtype as appropriate. 206 */ 207 int 208 rss_mbuf_software_hash_v6(const struct mbuf *m, int dir, uint32_t *hashval, 209 uint32_t *hashtype) 210 { 211 const struct ip6_hdr *ip6; 212 const struct ip6_frag *ip6f; 213 const struct tcphdr *th; 214 const struct udphdr *uh; 215 uint32_t flowtype; 216 uint8_t proto; 217 int off, newoff; 218 int nxt; 219 220 /* 221 * XXX For now this only handles hashing on incoming mbufs. 222 */ 223 if (dir != RSS_HASH_PKT_INGRESS) { 224 RSS_DEBUG("called on EGRESS packet!\n"); 225 return (-1); 226 } 227 228 off = sizeof(struct ip6_hdr); 229 230 /* 231 * First, validate that the mbuf we have is long enough 232 * to have an IPv6 header in it. 233 */ 234 if (m->m_pkthdr.len < off) { 235 RSS_DEBUG("short mbuf pkthdr\n"); 236 return (-1); 237 } 238 if (m->m_len < off) { 239 RSS_DEBUG("short mbuf len\n"); 240 return (-1); 241 } 242 243 /* Ok, let's dereference that */ 244 ip6 = mtod(m, struct ip6_hdr *); 245 proto = ip6->ip6_nxt; 246 247 /* 248 * Find the beginning of the TCP/UDP header. 249 * 250 * If this is a fragment then it shouldn't be four-tuple 251 * hashed just yet. Once it's reassembled into a full 252 * frame it should be re-hashed. 253 */ 254 while (proto != IPPROTO_FRAGMENT) { 255 newoff = ip6_nexthdr(m, off, proto, &nxt); 256 if (newoff < 0) 257 break; 258 off = newoff; 259 proto = nxt; 260 } 261 262 /* 263 * Ignore the fragment header if this is an "atomic" fragment 264 * (offset and m bit set to 0) 265 */ 266 if (proto == IPPROTO_FRAGMENT) { 267 if (m->m_len < off + sizeof(struct ip6_frag)) { 268 RSS_DEBUG("short fragment frame?\n"); 269 return (-1); 270 } 271 ip6f = (const struct ip6_frag *)((c_caddr_t)ip6 + off); 272 if ((ip6f->ip6f_offlg & ~IP6F_RESERVED_MASK) == 0) { 273 off = ip6_lasthdr(m, off, proto, &nxt); 274 if (off < 0) { 275 RSS_DEBUG("invalid extension header\n"); 276 return (-1); 277 } 278 proto = nxt; 279 } 280 } 281 282 /* 283 * If the mbuf flowid/flowtype matches the packet type, 284 * and we don't support the 4-tuple version of the given protocol, 285 * then signal to the owner that it can trust the flowid/flowtype 286 * details. 287 * 288 * This is a little picky - eg, if TCPv6 / UDPv6 hashing 289 * is supported but we got a TCP/UDP frame only 2-tuple hashed, 290 * then we shouldn't just "trust" the 2-tuple hash. We need 291 * a 4-tuple hash. 292 */ 293 flowtype = M_HASHTYPE_GET(m); 294 295 if (flowtype != M_HASHTYPE_NONE) { 296 switch (proto) { 297 case IPPROTO_UDP: 298 if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6) && 299 (flowtype == M_HASHTYPE_RSS_UDP_IPV6)) { 300 return (1); 301 } 302 /* 303 * Only allow 2-tuple for UDP frames if we don't also 304 * support 4-tuple for UDP. 305 */ 306 if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) && 307 ((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6) == 0) && 308 flowtype == M_HASHTYPE_RSS_IPV6) { 309 return (1); 310 } 311 break; 312 case IPPROTO_TCP: 313 if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6) && 314 (flowtype == M_HASHTYPE_RSS_TCP_IPV6)) { 315 return (1); 316 } 317 /* 318 * Only allow 2-tuple for TCP frames if we don't also 319 * support 4-tuple for TCP. 320 */ 321 if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) && 322 ((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6) == 0) && 323 flowtype == M_HASHTYPE_RSS_IPV6) { 324 return (1); 325 } 326 break; 327 default: 328 if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) && 329 flowtype == M_HASHTYPE_RSS_IPV6) { 330 return (1); 331 } 332 break; 333 } 334 } 335 336 /* 337 * Decode enough information to make a hash decision. 338 */ 339 if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6) && 340 (proto == IPPROTO_TCP)) { 341 if (m->m_len < off + sizeof(struct tcphdr)) { 342 RSS_DEBUG("short TCP frame?\n"); 343 return (-1); 344 } 345 th = (const struct tcphdr *)((c_caddr_t)ip6 + off); 346 return rss_proto_software_hash_v6(&ip6->ip6_src, &ip6->ip6_dst, 347 th->th_sport, 348 th->th_dport, 349 proto, 350 hashval, 351 hashtype); 352 } else if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6) && 353 (proto == IPPROTO_UDP)) { 354 if (m->m_len < off + sizeof(struct udphdr)) { 355 RSS_DEBUG("short UDP frame?\n"); 356 return (-1); 357 } 358 uh = (const struct udphdr *)((c_caddr_t)ip6 + off); 359 return rss_proto_software_hash_v6(&ip6->ip6_src, &ip6->ip6_dst, 360 uh->uh_sport, 361 uh->uh_dport, 362 proto, 363 hashval, 364 hashtype); 365 } else if (rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) { 366 /* Default to 2-tuple hash */ 367 return rss_proto_software_hash_v6(&ip6->ip6_src, &ip6->ip6_dst, 368 0, /* source port */ 369 0, /* destination port */ 370 0, /* IPPROTO_IP */ 371 hashval, 372 hashtype); 373 } else { 374 RSS_DEBUG("no available hashtypes!\n"); 375 return (-1); 376 } 377 } 378 379 #ifdef RSS 380 /* 381 * Similar to rss_m2cpuid, but designed to be used by the IPv6 NETISR 382 * on incoming frames. 383 * 384 * If an existing RSS hash exists and it matches what the configured 385 * hashing is, then use it. 386 * 387 * If there's an existing RSS hash but the desired hash is different, 388 * or if there's no useful RSS hash, then calculate it via 389 * the software path. 390 * 391 * XXX TODO: definitely want statistics here! 392 */ 393 struct mbuf * 394 rss_soft_m2cpuid_v6(struct mbuf *m, uintptr_t source, u_int *cpuid) 395 { 396 uint32_t hash_val, hash_type; 397 int ret; 398 399 M_ASSERTPKTHDR(m); 400 401 ret = rss_mbuf_software_hash_v6(m, RSS_HASH_PKT_INGRESS, 402 &hash_val, &hash_type); 403 if (ret > 0) { 404 /* mbuf has a valid hash already; don't need to modify it */ 405 *cpuid = rss_hash2cpuid(m->m_pkthdr.flowid, M_HASHTYPE_GET(m)); 406 } else if (ret == 0) { 407 /* hash was done; update */ 408 m->m_pkthdr.flowid = hash_val; 409 M_HASHTYPE_SET(m, hash_type); 410 *cpuid = rss_hash2cpuid(m->m_pkthdr.flowid, M_HASHTYPE_GET(m)); 411 } else { /* ret < 0 */ 412 /* no hash was done */ 413 *cpuid = NETISR_CPUID_NONE; 414 } 415 return (m); 416 } 417 #endif 418