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
400 lines
11 KiB
C
400 lines
11 KiB
C
/*-
|
|
* 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 <netinet/in_rss.h>
|
|
#include <netinet/in_var.h>
|
|
|
|
/* for software rss hash support */
|
|
#include <netinet/ip.h>
|
|
#include <netinet/tcp.h>
|
|
#include <netinet/udp.h>
|
|
|
|
/*
|
|
* Hash an IPv4 2-tuple.
|
|
*/
|
|
uint32_t
|
|
rss_hash_ip4_2tuple(struct in_addr src, struct in_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 IPv4 4-tuple.
|
|
*/
|
|
uint32_t
|
|
rss_hash_ip4_4tuple(struct in_addr src, u_short srcport, struct in_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 ipv4 2-tuple or 4-tuple given the given
|
|
* IPv4 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_v4(struct in_addr s, struct in_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_IPV4)) {
|
|
hash = rss_hash_ip4_4tuple(s, sp, d, dp);
|
|
*hashval = hash;
|
|
*hashtype = M_HASHTYPE_RSS_TCP_IPV4;
|
|
return (0);
|
|
} else if ((proto == IPPROTO_UDP) &&
|
|
(rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV4)) {
|
|
hash = rss_hash_ip4_4tuple(s, sp, d, dp);
|
|
*hashval = hash;
|
|
*hashtype = M_HASHTYPE_RSS_UDP_IPV4;
|
|
return (0);
|
|
} else if (rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV4) {
|
|
/* RSS doesn't hash on other protocols like SCTP; so 2-tuple */
|
|
hash = rss_hash_ip4_2tuple(s, d);
|
|
*hashval = hash;
|
|
*hashtype = M_HASHTYPE_RSS_IPV4;
|
|
return (0);
|
|
}
|
|
|
|
/* No configured available hashtypes! */
|
|
RSS_DEBUG("no available hashtypes!\n");
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* Calculate an appropriate ipv4 2-tuple or 4-tuple given the given
|
|
* IPv4 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 "outgoing" packet order (ie, destination is "far" address.)
|
|
*/
|
|
uint32_t
|
|
xps_proto_software_hash_v4(struct in_addr s, struct in_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_IPV4)) {
|
|
hash = rss_hash_ip4_4tuple(d, dp, s, sp);
|
|
*hashtype = M_HASHTYPE_RSS_TCP_IPV4;
|
|
return (hash);
|
|
} else if ((proto == IPPROTO_UDP) &&
|
|
(rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV4)) {
|
|
hash = rss_hash_ip4_4tuple(d, dp, s, sp);
|
|
*hashtype = M_HASHTYPE_RSS_UDP_IPV4;
|
|
return (hash);
|
|
} else if (rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV4) {
|
|
/* RSS doesn't hash on other protocols like SCTP; so 2-tuple */
|
|
hash = rss_hash_ip4_2tuple(d, s);
|
|
*hashtype = M_HASHTYPE_RSS_IPV4;
|
|
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_v4(const struct mbuf *m, int dir, uint32_t *hashval,
|
|
uint32_t *hashtype)
|
|
{
|
|
const struct ip *ip;
|
|
const struct tcphdr *th;
|
|
const struct udphdr *uh;
|
|
uint32_t flowid;
|
|
uint32_t flowtype;
|
|
uint8_t proto;
|
|
int iphlen;
|
|
int is_frag = 0;
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
/*
|
|
* First, validate that the mbuf we have is long enough
|
|
* to have an IPv4 header in it.
|
|
*/
|
|
if (m->m_pkthdr.len < (sizeof(struct ip))) {
|
|
RSS_DEBUG("short mbuf pkthdr\n");
|
|
return (-1);
|
|
}
|
|
if (m->m_len < (sizeof(struct ip))) {
|
|
RSS_DEBUG("short mbuf len\n");
|
|
return (-1);
|
|
}
|
|
|
|
/* Ok, let's dereference that */
|
|
ip = mtod(m, struct ip *);
|
|
proto = ip->ip_p;
|
|
iphlen = ip->ip_hl << 2;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
if (ip->ip_off & htons(IP_MF | IP_OFFMASK))
|
|
is_frag = 1;
|
|
|
|
/*
|
|
* 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 TCPv4 / UDPv4 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.
|
|
*/
|
|
flowid = m->m_pkthdr.flowid;
|
|
flowtype = M_HASHTYPE_GET(m);
|
|
|
|
if (flowtype != M_HASHTYPE_NONE) {
|
|
switch (proto) {
|
|
case IPPROTO_UDP:
|
|
if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV4) &&
|
|
(flowtype == M_HASHTYPE_RSS_UDP_IPV4) &&
|
|
(is_frag == 0)) {
|
|
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_IPV4) &&
|
|
((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV4) == 0) &&
|
|
flowtype == M_HASHTYPE_RSS_IPV4) {
|
|
return (1);
|
|
}
|
|
break;
|
|
case IPPROTO_TCP:
|
|
if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV4) &&
|
|
(flowtype == M_HASHTYPE_RSS_TCP_IPV4) &&
|
|
(is_frag == 0)) {
|
|
return (1);
|
|
}
|
|
/*
|
|
* Only allow 2-tuple for TCP frames if we don't also
|
|
* support 2-tuple for TCP.
|
|
*/
|
|
if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV4) &&
|
|
((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV4) == 0) &&
|
|
flowtype == M_HASHTYPE_RSS_IPV4) {
|
|
return (1);
|
|
}
|
|
break;
|
|
default:
|
|
if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV4) &&
|
|
flowtype == M_HASHTYPE_RSS_IPV4) {
|
|
return (1);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Decode enough information to make a hash decision.
|
|
*
|
|
* XXX TODO: does the hardware hash on 4-tuple if IP
|
|
* options are present?
|
|
*/
|
|
if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV4) &&
|
|
(proto == IPPROTO_TCP) &&
|
|
(is_frag == 0)) {
|
|
if (m->m_len < iphlen + sizeof(struct tcphdr)) {
|
|
RSS_DEBUG("short TCP frame?\n");
|
|
return (-1);
|
|
}
|
|
th = (const struct tcphdr *)((c_caddr_t)ip + iphlen);
|
|
return rss_proto_software_hash_v4(ip->ip_src, ip->ip_dst,
|
|
th->th_sport,
|
|
th->th_dport,
|
|
proto,
|
|
hashval,
|
|
hashtype);
|
|
} else if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV4) &&
|
|
(proto == IPPROTO_UDP) &&
|
|
(is_frag == 0)) {
|
|
uh = (const struct udphdr *)((c_caddr_t)ip + iphlen);
|
|
if (m->m_len < iphlen + sizeof(struct udphdr)) {
|
|
RSS_DEBUG("short UDP frame?\n");
|
|
return (-1);
|
|
}
|
|
return rss_proto_software_hash_v4(ip->ip_src, ip->ip_dst,
|
|
uh->uh_sport,
|
|
uh->uh_dport,
|
|
proto,
|
|
hashval,
|
|
hashtype);
|
|
} else if (rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV4) {
|
|
/* Default to 2-tuple hash */
|
|
return rss_proto_software_hash_v4(ip->ip_src, ip->ip_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 IP 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_v4(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_v4(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);
|
|
}
|