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: releng/11.2/sys/netinet6/in6_rss.c 290471 2015-11-06 23:07:43Z adrian $");
   33 
   34 #include "opt_inet6.h"
   35 #include "opt_pcbgroup.h"
   36 
   37 #ifndef PCBGROUP
   38 #error "options RSS depends on options PCBGROUP"
   39 #endif
   40 
   41 #include <sys/param.h>
   42 #include <sys/mbuf.h>
   43 #include <sys/socket.h>
   44 #include <sys/priv.h>
   45 #include <sys/kernel.h>
   46 #include <sys/smp.h>
   47 #include <sys/sysctl.h>
   48 #include <sys/sbuf.h>
   49 
   50 #include <net/if.h>
   51 #include <net/if_var.h>
   52 #include <net/netisr.h>
   53 #include <net/rss_config.h>
   54 
   55 #include <netinet/in.h>
   56 #include <netinet/in_pcb.h>
   57 #include <netinet6/in6_rss.h>
   58 #include <netinet/in_var.h>
   59 
   60 /* for software rss hash support */
   61 #include <netinet/ip6.h>
   62 #include <netinet6/ip6_var.h>
   63 #include <netinet/tcp.h>
   64 #include <netinet/udp.h>
   65 
   66 /*
   67  * Hash an IPv6 2-tuple.
   68  */
   69 uint32_t
   70 rss_hash_ip6_2tuple(const struct in6_addr *src, const struct in6_addr *dst)
   71 {
   72         uint8_t data[sizeof(*src) + sizeof(*dst)];
   73         u_int datalen;
   74 
   75         datalen = 0;
   76         bcopy(src, &data[datalen], sizeof(*src));
   77         datalen += sizeof(*src);
   78         bcopy(dst, &data[datalen], sizeof(*dst));
   79         datalen += sizeof(*dst);
   80         return (rss_hash(datalen, data));
   81 }
   82 
   83 /*
   84  * Hash an IPv6 4-tuple.
   85  */
   86 uint32_t
   87 rss_hash_ip6_4tuple(const struct in6_addr *src, u_short srcport,
   88     const struct in6_addr *dst, u_short dstport)
   89 {
   90         uint8_t data[sizeof(*src) + sizeof(*dst) + sizeof(srcport) +
   91             sizeof(dstport)];
   92         u_int datalen;
   93 
   94         datalen = 0;
   95         bcopy(src, &data[datalen], sizeof(*src));
   96         datalen += sizeof(*src);
   97         bcopy(dst, &data[datalen], sizeof(*dst));
   98         datalen += sizeof(*dst);
   99         bcopy(&srcport, &data[datalen], sizeof(srcport));
  100         datalen += sizeof(srcport);
  101         bcopy(&dstport, &data[datalen], sizeof(dstport));
  102         datalen += sizeof(dstport);
  103         return (rss_hash(datalen, data));
  104 }
  105 
  106 /*
  107  * Calculate an appropriate ipv6 2-tuple or 4-tuple given the given
  108  * IPv6 source/destination address, UDP or TCP source/destination ports
  109  * and the protocol type.
  110  *
  111  * The protocol code may wish to do a software hash of the given
  112  * tuple.  This depends upon the currently configured RSS hash types.
  113  *
  114  * This assumes that the packet in question isn't a fragment.
  115  *
  116  * It also assumes the packet source/destination address
  117  * are in "incoming" packet order (ie, source is "far" address.)
  118  */
  119 int
  120 rss_proto_software_hash_v6(const struct in6_addr *s, const struct in6_addr *d,
  121     u_short sp, u_short dp, int proto,
  122     uint32_t *hashval, uint32_t *hashtype)
  123 {
  124         uint32_t hash;
  125 
  126         /*
  127          * Next, choose the hash type depending upon the protocol
  128          * identifier.
  129          */
  130         if ((proto == IPPROTO_TCP) &&
  131             (rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6)) {
  132                 hash = rss_hash_ip6_4tuple(s, sp, d, dp);
  133                 *hashval = hash;
  134                 *hashtype = M_HASHTYPE_RSS_TCP_IPV6;
  135                 return (0);
  136         } else if ((proto == IPPROTO_UDP) &&
  137             (rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6)) {
  138                 hash = rss_hash_ip6_4tuple(s, sp, d, dp);
  139                 *hashval = hash;
  140                 *hashtype = M_HASHTYPE_RSS_UDP_IPV6;
  141                 return (0);
  142         } else if (rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) {
  143                 /* RSS doesn't hash on other protocols like SCTP; so 2-tuple */
  144                 hash = rss_hash_ip6_2tuple(s, d);
  145                 *hashval = hash;
  146                 *hashtype = M_HASHTYPE_RSS_IPV6;
  147                 return (0);
  148         }
  149 
  150         /* No configured available hashtypes! */
  151         RSS_DEBUG("no available hashtypes!\n");
  152         return (-1);
  153 }
  154 
  155 /*
  156  * Do a software calculation of the RSS for the given mbuf.
  157  *
  158  * This is typically used by the input path to recalculate the RSS after
  159  * some form of packet processing (eg de-capsulation, IP fragment reassembly.)
  160  *
  161  * dir is the packet direction - RSS_HASH_PKT_INGRESS for incoming and
  162  * RSS_HASH_PKT_EGRESS for outgoing.
  163  *
  164  * Returns 0 if a hash was done, -1 if no hash was done, +1 if
  165  * the mbuf already had a valid RSS flowid.
  166  *
  167  * This function doesn't modify the mbuf.  It's up to the caller to
  168  * assign flowid/flowtype as appropriate.
  169  */
  170 int
  171 rss_mbuf_software_hash_v6(const struct mbuf *m, int dir, uint32_t *hashval,
  172     uint32_t *hashtype)
  173 {
  174         const struct ip6_hdr *ip6;
  175         const struct ip6_frag *ip6f;
  176         const struct tcphdr *th;
  177         const struct udphdr *uh;
  178         uint32_t flowtype;
  179         uint8_t proto;
  180         int off, newoff;
  181         int nxt;
  182 
  183         /*
  184          * XXX For now this only handles hashing on incoming mbufs.
  185          */
  186         if (dir != RSS_HASH_PKT_INGRESS) {
  187                 RSS_DEBUG("called on EGRESS packet!\n");
  188                 return (-1);
  189         }
  190 
  191         off = sizeof(struct ip6_hdr);
  192 
  193         /*
  194          * First, validate that the mbuf we have is long enough
  195          * to have an IPv6 header in it.
  196          */
  197         if (m->m_pkthdr.len < off) {
  198                 RSS_DEBUG("short mbuf pkthdr\n");
  199                 return (-1);
  200         }
  201         if (m->m_len < off) {
  202                 RSS_DEBUG("short mbuf len\n");
  203                 return (-1);
  204         }
  205 
  206         /* Ok, let's dereference that */
  207         ip6 = mtod(m, struct ip6_hdr *);
  208         proto = ip6->ip6_nxt;
  209 
  210         /*
  211          * Find the beginning of the TCP/UDP header.
  212          *
  213          * If this is a fragment then it shouldn't be four-tuple
  214          * hashed just yet.  Once it's reassembled into a full
  215          * frame it should be re-hashed.
  216          */
  217         while (proto != IPPROTO_FRAGMENT) {
  218                 newoff = ip6_nexthdr(m, off, proto, &nxt);
  219                 if (newoff < 0)
  220                         break;
  221                 off = newoff;
  222                 proto = nxt;
  223         }
  224 
  225         /*
  226          * Ignore the fragment header if this is an "atomic" fragment
  227          * (offset and m bit set to 0)
  228          */
  229         if (proto == IPPROTO_FRAGMENT) {
  230                 if (m->m_len < off + sizeof(struct ip6_frag)) {
  231                         RSS_DEBUG("short fragment frame?\n");
  232                         return (-1);
  233                 }
  234                 ip6f = (const struct ip6_frag *)((c_caddr_t)ip6 + off);
  235                 if ((ip6f->ip6f_offlg & ~IP6F_RESERVED_MASK) == 0) {
  236                         off = ip6_lasthdr(m, off, proto, &nxt);
  237                         if (off < 0) {
  238                                 RSS_DEBUG("invalid extension header\n");
  239                                 return (-1);
  240                         }
  241                         proto = nxt;
  242                 }
  243         }
  244 
  245         /*
  246          * If the mbuf flowid/flowtype matches the packet type,
  247          * and we don't support the 4-tuple version of the given protocol,
  248          * then signal to the owner that it can trust the flowid/flowtype
  249          * details.
  250          *
  251          * This is a little picky - eg, if TCPv6 / UDPv6 hashing
  252          * is supported but we got a TCP/UDP frame only 2-tuple hashed,
  253          * then we shouldn't just "trust" the 2-tuple hash.  We need
  254          * a 4-tuple hash.
  255          */
  256         flowtype = M_HASHTYPE_GET(m);
  257 
  258         if (flowtype != M_HASHTYPE_NONE) {
  259                 switch (proto) {
  260                 case IPPROTO_UDP:
  261                         if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6) &&
  262                             (flowtype == M_HASHTYPE_RSS_UDP_IPV6)) {
  263                                 return (1);
  264                         }
  265                         /*
  266                          * Only allow 2-tuple for UDP frames if we don't also
  267                          * support 4-tuple for UDP.
  268                          */
  269                         if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) &&
  270                             ((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6) == 0) &&
  271                             flowtype == M_HASHTYPE_RSS_IPV6) {
  272                                 return (1);
  273                         }
  274                         break;
  275                 case IPPROTO_TCP:
  276                         if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6) &&
  277                             (flowtype == M_HASHTYPE_RSS_TCP_IPV6)) {
  278                                 return (1);
  279                         }
  280                         /*
  281                          * Only allow 2-tuple for TCP frames if we don't also
  282                          * support 4-tuple for TCP.
  283                          */
  284                         if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) &&
  285                             ((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6) == 0) &&
  286                             flowtype == M_HASHTYPE_RSS_IPV6) {
  287                                 return (1);
  288                         }
  289                         break;
  290                 default:
  291                         if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) &&
  292                             flowtype == M_HASHTYPE_RSS_IPV6) {
  293                                 return (1);
  294                         }
  295                         break;
  296                 }
  297         }
  298 
  299         /*
  300          * Decode enough information to make a hash decision.
  301          */
  302         if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6) &&
  303             (proto == IPPROTO_TCP)) {
  304                 if (m->m_len < off + sizeof(struct tcphdr)) {
  305                         RSS_DEBUG("short TCP frame?\n");
  306                         return (-1);
  307                 }
  308                 th = (const struct tcphdr *)((c_caddr_t)ip6 + off);
  309                 return rss_proto_software_hash_v6(&ip6->ip6_src, &ip6->ip6_dst,
  310                     th->th_sport,
  311                     th->th_dport,
  312                     proto,
  313                     hashval,
  314                     hashtype);
  315         } else if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6) &&
  316             (proto == IPPROTO_UDP)) {
  317                 if (m->m_len < off + sizeof(struct udphdr)) {
  318                         RSS_DEBUG("short UDP frame?\n");
  319                         return (-1);
  320                 }
  321                 uh = (const struct udphdr *)((c_caddr_t)ip6 + off);
  322                 return rss_proto_software_hash_v6(&ip6->ip6_src, &ip6->ip6_dst,
  323                     uh->uh_sport,
  324                     uh->uh_dport,
  325                     proto,
  326                     hashval,
  327                     hashtype);
  328         } else if (rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) {
  329                 /* Default to 2-tuple hash */
  330                 return rss_proto_software_hash_v6(&ip6->ip6_src, &ip6->ip6_dst,
  331                     0,  /* source port */
  332                     0,  /* destination port */
  333                     0,  /* IPPROTO_IP */
  334                     hashval,
  335                     hashtype);
  336         } else {
  337                 RSS_DEBUG("no available hashtypes!\n");
  338                 return (-1);
  339         }
  340 }
  341 
  342 /*
  343  * Similar to rss_m2cpuid, but designed to be used by the IPv6 NETISR
  344  * on incoming frames.
  345  *
  346  * If an existing RSS hash exists and it matches what the configured
  347  * hashing is, then use it.
  348  *
  349  * If there's an existing RSS hash but the desired hash is different,
  350  * or if there's no useful RSS hash, then calculate it via
  351  * the software path.
  352  *
  353  * XXX TODO: definitely want statistics here!
  354  */
  355 struct mbuf *
  356 rss_soft_m2cpuid_v6(struct mbuf *m, uintptr_t source, u_int *cpuid)
  357 {
  358         uint32_t hash_val, hash_type;
  359         int ret;
  360 
  361         M_ASSERTPKTHDR(m);
  362 
  363         ret = rss_mbuf_software_hash_v6(m, RSS_HASH_PKT_INGRESS,
  364             &hash_val, &hash_type);
  365         if (ret > 0) {
  366                 /* mbuf has a valid hash already; don't need to modify it */
  367                 *cpuid = rss_hash2cpuid(m->m_pkthdr.flowid, M_HASHTYPE_GET(m));
  368         } else if (ret == 0) {
  369                 /* hash was done; update */
  370                 m->m_pkthdr.flowid = hash_val;
  371                 M_HASHTYPE_SET(m, hash_type);
  372                 *cpuid = rss_hash2cpuid(m->m_pkthdr.flowid, M_HASHTYPE_GET(m));
  373         } else { /* ret < 0 */
  374                 /* no hash was done */
  375                 *cpuid = NETISR_CPUID_NONE;
  376         }
  377         return (m);
  378 }
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FreeBSD/Linux Kernel Cross Reference sys/netinet6/in6_rss.c

FreeBSD/Linux Kernel Cross Reference
sys/netinet6/in6_rss.c
