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- /*-
- * Copyright (c) 2010-2011 Juniper Networks, Inc.
- * All rights reserved.
- *
- * This software was developed by Robert N. M. Watson under contract
- * to Juniper Networks, Inc.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- #include "opt_inet6.h"
- #include "opt_pcbgroup.h"
- #ifndef PCBGROUP
- #error "options RSS depends on options PCBGROUP"
- #endif
- #include <sys/param.h>
- #include <sys/mbuf.h>
- #include <sys/socket.h>
- #include <sys/priv.h>
- #include <sys/kernel.h>
- #include <sys/smp.h>
- #include <sys/sysctl.h>
- #include <sys/sbuf.h>
- #include <net/if.h>
- #include <net/if_var.h>
- #include <net/netisr.h>
- #include <net/rss_config.h>
- #include <netinet/in.h>
- #include <netinet/in_pcb.h>
- #include <netinet6/in6_rss.h>
- #include <netinet/in_var.h>
- /* for software rss hash support */
- #include <netinet/ip6.h>
- #include <netinet6/ip6_var.h>
- #include <netinet/tcp.h>
- #include <netinet/udp.h>
- /*
- * Hash an IPv6 2-tuple.
- */
- uint32_t
- rss_hash_ip6_2tuple(const struct in6_addr *src, const struct in6_addr *dst)
- {
- uint8_t data[sizeof(*src) + sizeof(*dst)];
- u_int datalen;
- datalen = 0;
- bcopy(src, &data[datalen], sizeof(*src));
- datalen += sizeof(*src);
- bcopy(dst, &data[datalen], sizeof(*dst));
- datalen += sizeof(*dst);
- return (rss_hash(datalen, data));
- }
- /*
- * Hash an IPv6 4-tuple.
- */
- uint32_t
- rss_hash_ip6_4tuple(const struct in6_addr *src, u_short srcport,
- const struct in6_addr *dst, u_short dstport)
- {
- uint8_t data[sizeof(*src) + sizeof(*dst) + sizeof(srcport) +
- sizeof(dstport)];
- u_int datalen;
- datalen = 0;
- bcopy(src, &data[datalen], sizeof(*src));
- datalen += sizeof(*src);
- bcopy(dst, &data[datalen], sizeof(*dst));
- datalen += sizeof(*dst);
- bcopy(&srcport, &data[datalen], sizeof(srcport));
- datalen += sizeof(srcport);
- bcopy(&dstport, &data[datalen], sizeof(dstport));
- datalen += sizeof(dstport);
- return (rss_hash(datalen, data));
- }
- /*
- * Calculate an appropriate ipv6 2-tuple or 4-tuple given the given
- * IPv6 source/destination address, UDP or TCP source/destination ports
- * and the protocol type.
- *
- * The protocol code may wish to do a software hash of the given
- * tuple. This depends upon the currently configured RSS hash types.
- *
- * This assumes that the packet in question isn't a fragment.
- *
- * It also assumes the packet source/destination address
- * are in "incoming" packet order (ie, source is "far" address.)
- */
- int
- rss_proto_software_hash_v6(const struct in6_addr *s, const struct in6_addr *d,
- u_short sp, u_short dp, int proto,
- uint32_t *hashval, uint32_t *hashtype)
- {
- uint32_t hash;
- /*
- * Next, choose the hash type depending upon the protocol
- * identifier.
- */
- if ((proto == IPPROTO_TCP) &&
- (rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6)) {
- hash = rss_hash_ip6_4tuple(s, sp, d, dp);
- *hashval = hash;
- *hashtype = M_HASHTYPE_RSS_TCP_IPV6;
- return (0);
- } else if ((proto == IPPROTO_UDP) &&
- (rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6)) {
- hash = rss_hash_ip6_4tuple(s, sp, d, dp);
- *hashval = hash;
- *hashtype = M_HASHTYPE_RSS_UDP_IPV6;
- return (0);
- } else if (rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) {
- /* RSS doesn't hash on other protocols like SCTP; so 2-tuple */
- hash = rss_hash_ip6_2tuple(s, d);
- *hashval = hash;
- *hashtype = M_HASHTYPE_RSS_IPV6;
- return (0);
- }
- /* No configured available hashtypes! */
- RSS_DEBUG("no available hashtypes!\n");
- return (-1);
- }
- /*
- * Calculate an appropriate ipv6 2-tuple or 4-tuple given the given
- * IPv6 source/destination address, UDP or TCP source/destination ports
- * and the protocol type.
- *
- * The protocol code may wish to do a software hash of the given
- * tuple. This depends upon the currently configured RSS hash types.
- *
- * It assumes the packet source/destination address
- * are in "outgoin" packet order (ie, destination is "far" address.)
- */
- uint32_t
- xps_proto_software_hash_v6(const struct in6_addr *s, const struct in6_addr *d,
- u_short sp, u_short dp, int proto, uint32_t *hashtype)
- {
- uint32_t hash;
- /*
- * Next, choose the hash type depending upon the protocol
- * identifier.
- */
- if ((proto == IPPROTO_TCP) &&
- (rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6)) {
- hash = rss_hash_ip6_4tuple(d, dp, s, sp);
- *hashtype = M_HASHTYPE_RSS_TCP_IPV6;
- return (hash);
- } else if ((proto == IPPROTO_UDP) &&
- (rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6)) {
- hash = rss_hash_ip6_4tuple(d, dp, s, sp);
- *hashtype = M_HASHTYPE_RSS_UDP_IPV6;
- return (hash);
- } else if (rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) {
- /* RSS doesn't hash on other protocols like SCTP; so 2-tuple */
- hash = rss_hash_ip6_2tuple(d, s);
- *hashtype = M_HASHTYPE_RSS_IPV6;
- return (hash);
- }
- *hashtype = M_HASHTYPE_NONE;
- return (0);
- }
- /*
- * Do a software calculation of the RSS for the given mbuf.
- *
- * This is typically used by the input path to recalculate the RSS after
- * some form of packet processing (eg de-capsulation, IP fragment reassembly.)
- *
- * dir is the packet direction - RSS_HASH_PKT_INGRESS for incoming and
- * RSS_HASH_PKT_EGRESS for outgoing.
- *
- * Returns 0 if a hash was done, -1 if no hash was done, +1 if
- * the mbuf already had a valid RSS flowid.
- *
- * This function doesn't modify the mbuf. It's up to the caller to
- * assign flowid/flowtype as appropriate.
- */
- int
- rss_mbuf_software_hash_v6(const struct mbuf *m, int dir, uint32_t *hashval,
- uint32_t *hashtype)
- {
- const struct ip6_hdr *ip6;
- const struct ip6_frag *ip6f;
- const struct tcphdr *th;
- const struct udphdr *uh;
- uint32_t flowtype;
- uint8_t proto;
- int off, newoff;
- int nxt;
- /*
- * XXX For now this only handles hashing on incoming mbufs.
- */
- if (dir != RSS_HASH_PKT_INGRESS) {
- RSS_DEBUG("called on EGRESS packet!\n");
- return (-1);
- }
- off = sizeof(struct ip6_hdr);
- /*
- * First, validate that the mbuf we have is long enough
- * to have an IPv6 header in it.
- */
- if (m->m_pkthdr.len < off) {
- RSS_DEBUG("short mbuf pkthdr\n");
- return (-1);
- }
- if (m->m_len < off) {
- RSS_DEBUG("short mbuf len\n");
- return (-1);
- }
- /* Ok, let's dereference that */
- ip6 = mtod(m, struct ip6_hdr *);
- proto = ip6->ip6_nxt;
- /*
- * Find the beginning of the TCP/UDP header.
- *
- * If this is a fragment then it shouldn't be four-tuple
- * hashed just yet. Once it's reassembled into a full
- * frame it should be re-hashed.
- */
- while (proto != IPPROTO_FRAGMENT) {
- newoff = ip6_nexthdr(m, off, proto, &nxt);
- if (newoff < 0)
- break;
- off = newoff;
- proto = nxt;
- }
- /*
- * Ignore the fragment header if this is an "atomic" fragment
- * (offset and m bit set to 0)
- */
- if (proto == IPPROTO_FRAGMENT) {
- if (m->m_len < off + sizeof(struct ip6_frag)) {
- RSS_DEBUG("short fragment frame?\n");
- return (-1);
- }
- ip6f = (const struct ip6_frag *)((c_caddr_t)ip6 + off);
- if ((ip6f->ip6f_offlg & ~IP6F_RESERVED_MASK) == 0) {
- off = ip6_lasthdr(m, off, proto, &nxt);
- if (off < 0) {
- RSS_DEBUG("invalid extension header\n");
- return (-1);
- }
- proto = nxt;
- }
- }
- /*
- * If the mbuf flowid/flowtype matches the packet type,
- * and we don't support the 4-tuple version of the given protocol,
- * then signal to the owner that it can trust the flowid/flowtype
- * details.
- *
- * This is a little picky - eg, if TCPv6 / UDPv6 hashing
- * is supported but we got a TCP/UDP frame only 2-tuple hashed,
- * then we shouldn't just "trust" the 2-tuple hash. We need
- * a 4-tuple hash.
- */
- flowtype = M_HASHTYPE_GET(m);
- if (flowtype != M_HASHTYPE_NONE) {
- switch (proto) {
- case IPPROTO_UDP:
- if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6) &&
- (flowtype == M_HASHTYPE_RSS_UDP_IPV6)) {
- return (1);
- }
- /*
- * Only allow 2-tuple for UDP frames if we don't also
- * support 4-tuple for UDP.
- */
- if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) &&
- ((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6) == 0) &&
- flowtype == M_HASHTYPE_RSS_IPV6) {
- return (1);
- }
- break;
- case IPPROTO_TCP:
- if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6) &&
- (flowtype == M_HASHTYPE_RSS_TCP_IPV6)) {
- return (1);
- }
- /*
- * Only allow 2-tuple for TCP frames if we don't also
- * support 4-tuple for TCP.
- */
- if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) &&
- ((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6) == 0) &&
- flowtype == M_HASHTYPE_RSS_IPV6) {
- return (1);
- }
- break;
- default:
- if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) &&
- flowtype == M_HASHTYPE_RSS_IPV6) {
- return (1);
- }
- break;
- }
- }
- /*
- * Decode enough information to make a hash decision.
- */
- if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6) &&
- (proto == IPPROTO_TCP)) {
- if (m->m_len < off + sizeof(struct tcphdr)) {
- RSS_DEBUG("short TCP frame?\n");
- return (-1);
- }
- th = (const struct tcphdr *)((c_caddr_t)ip6 + off);
- return rss_proto_software_hash_v6(&ip6->ip6_src, &ip6->ip6_dst,
- th->th_sport,
- th->th_dport,
- proto,
- hashval,
- hashtype);
- } else if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6) &&
- (proto == IPPROTO_UDP)) {
- if (m->m_len < off + sizeof(struct udphdr)) {
- RSS_DEBUG("short UDP frame?\n");
- return (-1);
- }
- uh = (const struct udphdr *)((c_caddr_t)ip6 + off);
- return rss_proto_software_hash_v6(&ip6->ip6_src, &ip6->ip6_dst,
- uh->uh_sport,
- uh->uh_dport,
- proto,
- hashval,
- hashtype);
- } else if (rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) {
- /* Default to 2-tuple hash */
- return rss_proto_software_hash_v6(&ip6->ip6_src, &ip6->ip6_dst,
- 0, /* source port */
- 0, /* destination port */
- 0, /* IPPROTO_IP */
- hashval,
- hashtype);
- } else {
- RSS_DEBUG("no available hashtypes!\n");
- return (-1);
- }
- }
- /*
- * Similar to rss_m2cpuid, but designed to be used by the IPv6 NETISR
- * on incoming frames.
- *
- * If an existing RSS hash exists and it matches what the configured
- * hashing is, then use it.
- *
- * If there's an existing RSS hash but the desired hash is different,
- * or if there's no useful RSS hash, then calculate it via
- * the software path.
- *
- * XXX TODO: definitely want statistics here!
- */
- struct mbuf *
- rss_soft_m2cpuid_v6(struct mbuf *m, uintptr_t source, u_int *cpuid)
- {
- uint32_t hash_val, hash_type;
- int ret;
- M_ASSERTPKTHDR(m);
- ret = rss_mbuf_software_hash_v6(m, RSS_HASH_PKT_INGRESS,
- &hash_val, &hash_type);
- if (ret > 0) {
- /* mbuf has a valid hash already; don't need to modify it */
- *cpuid = rss_hash2cpuid(m->m_pkthdr.flowid, M_HASHTYPE_GET(m));
- } else if (ret == 0) {
- /* hash was done; update */
- m->m_pkthdr.flowid = hash_val;
- M_HASHTYPE_SET(m, hash_type);
- *cpuid = rss_hash2cpuid(m->m_pkthdr.flowid, M_HASHTYPE_GET(m));
- } else { /* ret < 0 */
- /* no hash was done */
- *cpuid = NETISR_CPUID_NONE;
- }
- return (m);
- }
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