0c325f53f1
connections over multiple paths. Multipath routing relies on mbuf flowid data for both transit and outbound traffic. Current code fills mbuf flowid from inp_flowid for connection-oriented sockets. However, inp_flowid is currently not calculated for outbound connections. This change creates simple hashing functions and starts calculating hashes for TCP,UDP/UDP-Lite and raw IP if multipath routes are present in the system. Reviewed by: glebius (previous version),ae Differential Revision: https://reviews.freebsd.org/D26523
423 lines
12 KiB
C
423 lines
12 KiB
C
/*-
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* Copyright (c) 2010-2011 Juniper Networks, Inc.
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* All rights reserved.
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*
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* This software was developed by Robert N. M. Watson under contract
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* to Juniper Networks, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet6.h"
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#include "opt_pcbgroup.h"
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#ifndef PCBGROUP
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#error "options RSS depends on options PCBGROUP"
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#endif
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#include <sys/param.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/priv.h>
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#include <sys/kernel.h>
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#include <sys/smp.h>
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#include <sys/sysctl.h>
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#include <sys/sbuf.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/netisr.h>
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#include <net/rss_config.h>
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#include <netinet/in.h>
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#include <netinet/in_pcb.h>
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#include <netinet6/in6_rss.h>
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#include <netinet/in_var.h>
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/* for software rss hash support */
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet/tcp.h>
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#include <netinet/udp.h>
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/*
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* Hash an IPv6 2-tuple.
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*/
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uint32_t
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rss_hash_ip6_2tuple(const struct in6_addr *src, const struct in6_addr *dst)
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{
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uint8_t data[sizeof(*src) + sizeof(*dst)];
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u_int datalen;
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datalen = 0;
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bcopy(src, &data[datalen], sizeof(*src));
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datalen += sizeof(*src);
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bcopy(dst, &data[datalen], sizeof(*dst));
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datalen += sizeof(*dst);
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return (rss_hash(datalen, data));
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}
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/*
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* Hash an IPv6 4-tuple.
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*/
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uint32_t
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rss_hash_ip6_4tuple(const struct in6_addr *src, u_short srcport,
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const struct in6_addr *dst, u_short dstport)
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{
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uint8_t data[sizeof(*src) + sizeof(*dst) + sizeof(srcport) +
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sizeof(dstport)];
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u_int datalen;
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datalen = 0;
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bcopy(src, &data[datalen], sizeof(*src));
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datalen += sizeof(*src);
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bcopy(dst, &data[datalen], sizeof(*dst));
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datalen += sizeof(*dst);
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bcopy(&srcport, &data[datalen], sizeof(srcport));
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datalen += sizeof(srcport);
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bcopy(&dstport, &data[datalen], sizeof(dstport));
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datalen += sizeof(dstport);
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return (rss_hash(datalen, data));
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}
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/*
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* Calculate an appropriate ipv6 2-tuple or 4-tuple given the given
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* IPv6 source/destination address, UDP or TCP source/destination ports
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* and the protocol type.
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*
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* The protocol code may wish to do a software hash of the given
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* tuple. This depends upon the currently configured RSS hash types.
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*
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* This assumes that the packet in question isn't a fragment.
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*
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* It also assumes the packet source/destination address
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* are in "incoming" packet order (ie, source is "far" address.)
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*/
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int
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rss_proto_software_hash_v6(const struct in6_addr *s, const struct in6_addr *d,
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u_short sp, u_short dp, int proto,
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uint32_t *hashval, uint32_t *hashtype)
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{
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uint32_t hash;
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/*
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* Next, choose the hash type depending upon the protocol
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* identifier.
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*/
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if ((proto == IPPROTO_TCP) &&
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(rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6)) {
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hash = rss_hash_ip6_4tuple(s, sp, d, dp);
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*hashval = hash;
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*hashtype = M_HASHTYPE_RSS_TCP_IPV6;
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return (0);
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} else if ((proto == IPPROTO_UDP) &&
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(rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6)) {
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hash = rss_hash_ip6_4tuple(s, sp, d, dp);
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*hashval = hash;
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*hashtype = M_HASHTYPE_RSS_UDP_IPV6;
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return (0);
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} else if (rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) {
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/* RSS doesn't hash on other protocols like SCTP; so 2-tuple */
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hash = rss_hash_ip6_2tuple(s, d);
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*hashval = hash;
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*hashtype = M_HASHTYPE_RSS_IPV6;
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return (0);
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}
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/* No configured available hashtypes! */
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RSS_DEBUG("no available hashtypes!\n");
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return (-1);
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}
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/*
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* Calculate an appropriate ipv6 2-tuple or 4-tuple given the given
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* IPv6 source/destination address, UDP or TCP source/destination ports
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* and the protocol type.
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*
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* The protocol code may wish to do a software hash of the given
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* tuple. This depends upon the currently configured RSS hash types.
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*
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* It assumes the packet source/destination address
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* are in "outgoin" packet order (ie, destination is "far" address.)
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*/
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uint32_t
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xps_proto_software_hash_v6(const struct in6_addr *s, const struct in6_addr *d,
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u_short sp, u_short dp, int proto, uint32_t *hashtype)
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{
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uint32_t hash;
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/*
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* Next, choose the hash type depending upon the protocol
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* identifier.
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*/
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if ((proto == IPPROTO_TCP) &&
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(rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6)) {
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hash = rss_hash_ip6_4tuple(d, dp, s, sp);
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*hashtype = M_HASHTYPE_RSS_TCP_IPV6;
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return (hash);
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} else if ((proto == IPPROTO_UDP) &&
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(rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6)) {
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hash = rss_hash_ip6_4tuple(d, dp, s, sp);
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*hashtype = M_HASHTYPE_RSS_UDP_IPV6;
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return (hash);
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} else if (rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) {
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/* RSS doesn't hash on other protocols like SCTP; so 2-tuple */
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hash = rss_hash_ip6_2tuple(d, s);
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*hashtype = M_HASHTYPE_RSS_IPV6;
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return (hash);
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}
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*hashtype = M_HASHTYPE_NONE;
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return (0);
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}
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/*
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* Do a software calculation of the RSS for the given mbuf.
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*
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* This is typically used by the input path to recalculate the RSS after
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* some form of packet processing (eg de-capsulation, IP fragment reassembly.)
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*
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* dir is the packet direction - RSS_HASH_PKT_INGRESS for incoming and
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* RSS_HASH_PKT_EGRESS for outgoing.
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*
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* Returns 0 if a hash was done, -1 if no hash was done, +1 if
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* the mbuf already had a valid RSS flowid.
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*
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* This function doesn't modify the mbuf. It's up to the caller to
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* assign flowid/flowtype as appropriate.
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*/
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int
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rss_mbuf_software_hash_v6(const struct mbuf *m, int dir, uint32_t *hashval,
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uint32_t *hashtype)
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{
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const struct ip6_hdr *ip6;
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const struct ip6_frag *ip6f;
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const struct tcphdr *th;
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const struct udphdr *uh;
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uint32_t flowtype;
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uint8_t proto;
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int off, newoff;
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int nxt;
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/*
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* XXX For now this only handles hashing on incoming mbufs.
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*/
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if (dir != RSS_HASH_PKT_INGRESS) {
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RSS_DEBUG("called on EGRESS packet!\n");
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return (-1);
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}
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off = sizeof(struct ip6_hdr);
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/*
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* First, validate that the mbuf we have is long enough
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* to have an IPv6 header in it.
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*/
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if (m->m_pkthdr.len < off) {
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RSS_DEBUG("short mbuf pkthdr\n");
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return (-1);
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}
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if (m->m_len < off) {
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RSS_DEBUG("short mbuf len\n");
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return (-1);
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}
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/* Ok, let's dereference that */
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ip6 = mtod(m, struct ip6_hdr *);
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proto = ip6->ip6_nxt;
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/*
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* Find the beginning of the TCP/UDP header.
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*
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* If this is a fragment then it shouldn't be four-tuple
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* hashed just yet. Once it's reassembled into a full
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* frame it should be re-hashed.
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*/
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while (proto != IPPROTO_FRAGMENT) {
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newoff = ip6_nexthdr(m, off, proto, &nxt);
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if (newoff < 0)
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break;
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off = newoff;
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proto = nxt;
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}
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/*
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* Ignore the fragment header if this is an "atomic" fragment
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* (offset and m bit set to 0)
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*/
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if (proto == IPPROTO_FRAGMENT) {
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if (m->m_len < off + sizeof(struct ip6_frag)) {
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RSS_DEBUG("short fragment frame?\n");
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return (-1);
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}
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ip6f = (const struct ip6_frag *)((c_caddr_t)ip6 + off);
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if ((ip6f->ip6f_offlg & ~IP6F_RESERVED_MASK) == 0) {
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off = ip6_lasthdr(m, off, proto, &nxt);
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if (off < 0) {
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RSS_DEBUG("invalid extension header\n");
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return (-1);
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}
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proto = nxt;
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}
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}
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/*
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* If the mbuf flowid/flowtype matches the packet type,
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* and we don't support the 4-tuple version of the given protocol,
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* then signal to the owner that it can trust the flowid/flowtype
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* details.
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*
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* This is a little picky - eg, if TCPv6 / UDPv6 hashing
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* is supported but we got a TCP/UDP frame only 2-tuple hashed,
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* then we shouldn't just "trust" the 2-tuple hash. We need
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* a 4-tuple hash.
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*/
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flowtype = M_HASHTYPE_GET(m);
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if (flowtype != M_HASHTYPE_NONE) {
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switch (proto) {
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case IPPROTO_UDP:
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if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6) &&
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(flowtype == M_HASHTYPE_RSS_UDP_IPV6)) {
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return (1);
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}
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/*
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* Only allow 2-tuple for UDP frames if we don't also
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* support 4-tuple for UDP.
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*/
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if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) &&
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((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6) == 0) &&
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flowtype == M_HASHTYPE_RSS_IPV6) {
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return (1);
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}
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break;
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case IPPROTO_TCP:
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if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6) &&
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(flowtype == M_HASHTYPE_RSS_TCP_IPV6)) {
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return (1);
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}
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/*
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* Only allow 2-tuple for TCP frames if we don't also
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* support 4-tuple for TCP.
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*/
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if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) &&
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((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6) == 0) &&
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flowtype == M_HASHTYPE_RSS_IPV6) {
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return (1);
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}
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break;
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default:
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if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) &&
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flowtype == M_HASHTYPE_RSS_IPV6) {
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return (1);
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}
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break;
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}
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}
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/*
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* Decode enough information to make a hash decision.
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*/
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if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6) &&
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(proto == IPPROTO_TCP)) {
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if (m->m_len < off + sizeof(struct tcphdr)) {
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RSS_DEBUG("short TCP frame?\n");
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return (-1);
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}
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th = (const struct tcphdr *)((c_caddr_t)ip6 + off);
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return rss_proto_software_hash_v6(&ip6->ip6_src, &ip6->ip6_dst,
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th->th_sport,
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th->th_dport,
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proto,
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hashval,
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hashtype);
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} else if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6) &&
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(proto == IPPROTO_UDP)) {
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if (m->m_len < off + sizeof(struct udphdr)) {
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RSS_DEBUG("short UDP frame?\n");
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return (-1);
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}
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uh = (const struct udphdr *)((c_caddr_t)ip6 + off);
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return rss_proto_software_hash_v6(&ip6->ip6_src, &ip6->ip6_dst,
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uh->uh_sport,
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uh->uh_dport,
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proto,
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hashval,
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hashtype);
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} else if (rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) {
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/* Default to 2-tuple hash */
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return rss_proto_software_hash_v6(&ip6->ip6_src, &ip6->ip6_dst,
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0, /* source port */
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0, /* destination port */
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0, /* IPPROTO_IP */
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hashval,
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hashtype);
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} else {
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RSS_DEBUG("no available hashtypes!\n");
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return (-1);
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}
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}
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/*
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* Similar to rss_m2cpuid, but designed to be used by the IPv6 NETISR
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* on incoming frames.
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*
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* If an existing RSS hash exists and it matches what the configured
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* hashing is, then use it.
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*
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* If there's an existing RSS hash but the desired hash is different,
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* or if there's no useful RSS hash, then calculate it via
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* the software path.
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*
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* XXX TODO: definitely want statistics here!
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*/
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struct mbuf *
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rss_soft_m2cpuid_v6(struct mbuf *m, uintptr_t source, u_int *cpuid)
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{
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uint32_t hash_val, hash_type;
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int ret;
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M_ASSERTPKTHDR(m);
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ret = rss_mbuf_software_hash_v6(m, RSS_HASH_PKT_INGRESS,
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&hash_val, &hash_type);
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if (ret > 0) {
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/* mbuf has a valid hash already; don't need to modify it */
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*cpuid = rss_hash2cpuid(m->m_pkthdr.flowid, M_HASHTYPE_GET(m));
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} else if (ret == 0) {
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/* hash was done; update */
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m->m_pkthdr.flowid = hash_val;
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M_HASHTYPE_SET(m, hash_type);
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*cpuid = rss_hash2cpuid(m->m_pkthdr.flowid, M_HASHTYPE_GET(m));
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} else { /* ret < 0 */
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/* no hash was done */
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*cpuid = NETISR_CPUID_NONE;
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}
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return (m);
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}
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