284 lines
8.2 KiB
C
284 lines
8.2 KiB
C
/* $NetBSD: rss_config.c,v 1.3 2021/09/24 04:11:02 knakahara Exp $ */
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/*
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* Copyright (c) 2018 Internet Initiative Japan Inc.
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* All rights reserved.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: rss_config.c,v 1.3 2021/09/24 04:11:02 knakahara Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/mbuf.h>
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#include <net/rss_config.h>
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#include <net/toeplitz.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/tcp.h>
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#include <netinet/udp.h>
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#include <netinet/ip6.h>
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/*
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* Same as FreeBSD.
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*
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* This rss key is assumed for verification suite in many intel Gigabit and
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* 10 Gigabit Controller specifications.
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*/
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static uint8_t rss_default_key[RSS_KEYSIZE] = {
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0x6d, 0x5a, 0x56, 0xda, 0x25, 0x5b, 0x0e, 0xc2,
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0x41, 0x67, 0x25, 0x3d, 0x43, 0xa3, 0x8f, 0xb0,
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0xd0, 0xca, 0x2b, 0xcb, 0xae, 0x7b, 0x30, 0xb4,
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0x77, 0xcb, 0x2d, 0xa3, 0x80, 0x30, 0xf2, 0x0c,
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0x6a, 0x42, 0xb7, 0x3b, 0xbe, 0xac, 0x01, 0xfa,
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};
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#ifdef NOTYET
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/*
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* Same as DragonFlyBSD.
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*
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* This rss key make rss hash value symmetric, that is, the hash value
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* calculated by func("source address", "destination address") equals to
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* the hash value calculated by func("destination address", "source address").
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*/
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static uint8_t rss_symmetric_key[RSS_KEYSIZE] = {
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0x6d, 0x5a, 0x6d, 0x5a, 0x6d, 0x5a, 0x6d, 0x5a,
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0x6d, 0x5a, 0x6d, 0x5a, 0x6d, 0x5a, 0x6d, 0x5a,
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0x6d, 0x5a, 0x6d, 0x5a, 0x6d, 0x5a, 0x6d, 0x5a,
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0x6d, 0x5a, 0x6d, 0x5a, 0x6d, 0x5a, 0x6d, 0x5a,
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0x6d, 0x5a, 0x6d, 0x5a, 0x6d, 0x5a, 0x6d, 0x5a,
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};
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#endif
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/*
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* sizeof(key) must be more than or equal to RSS_KEYSIZE.
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*/
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void
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rss_getkey(uint8_t *key)
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{
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memcpy(key, rss_default_key, sizeof(rss_default_key));
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}
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/*
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* Calculate rss hash value from IPv4 mbuf.
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* This function should be called before ip_input().
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*/
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uint32_t
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rss_toeplitz_hash_from_mbuf_ipv4(const struct mbuf *m, u_int flag)
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{
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struct ip *ip;
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int hlen;
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uint8_t key[RSS_KEYSIZE];
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KASSERT((m->m_flags & M_PKTHDR) != 0);
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KASSERT(m->m_len >= sizeof (struct ip));
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ip = mtod(m, struct ip *);
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KASSERT(ip->ip_v == IPVERSION);
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hlen = ip->ip_hl << 2;
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if (hlen < sizeof(struct ip))
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return 0;
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rss_getkey(key);
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switch (ip->ip_p) {
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case IPPROTO_TCP:
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{
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if ((flag & RSS_TOEPLITZ_USE_TCP_PORT) != 0) {
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if (m->m_len >= hlen + sizeof(struct tcphdr)) {
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struct tcphdr *th;
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th = (struct tcphdr *)(mtod(m, char *) + hlen);
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return toeplitz_vhash(key, sizeof(key),
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/* ip_src and ip_dst in struct ip must be sequential */
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&ip->ip_src, sizeof(ip->ip_src) * 2,
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/* th_sport and th_dport in tcphdr must be sequential */
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&th->th_sport, sizeof(th->th_sport) * 2,
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NULL);
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} else if (m->m_pkthdr.len >= hlen + sizeof(struct tcphdr)) {
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uint16_t ports[2];
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/* ditto */
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m_copydata(__UNCONST(m), hlen + offsetof(struct tcphdr, th_sport),
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sizeof(ports), ports);
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return toeplitz_vhash(key, sizeof(key),
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&ip->ip_src, sizeof(ip->ip_src) * 2,
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ports, sizeof(ports),
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NULL);
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}
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}
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/*
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* Treat as raw packet.
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*/
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return toeplitz_vhash(key, sizeof(key),
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/* ditto */
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&ip->ip_src, sizeof(ip->ip_src) * 2,
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NULL);
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}
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case IPPROTO_UDP:
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{
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if ((flag & RSS_TOEPLITZ_USE_UDP_PORT) != 0) {
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if (m->m_len >= hlen + sizeof(struct udphdr)) {
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struct udphdr *uh;
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uh = (struct udphdr *)(mtod(m, char *) + hlen);
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return toeplitz_vhash(key, sizeof(key),
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/* ip_src and ip_dst in struct ip must sequential */
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&ip->ip_src, sizeof(ip->ip_src) * 2,
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/* uh_sport and uh_dport in udphdr must be sequential */
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&uh->uh_sport, sizeof(uh->uh_sport) * 2,
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NULL);
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} else if (m->m_pkthdr.len >= hlen + sizeof(struct udphdr)) {
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uint16_t ports[2];
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/* ditto */
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m_copydata(__UNCONST(m), hlen + offsetof(struct udphdr, uh_sport),
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sizeof(ports), ports);
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return toeplitz_vhash(key, sizeof(key),
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&ip->ip_src, sizeof(ip->ip_src) * 2,
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ports, sizeof(ports),
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NULL);
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}
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}
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/*
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* Treat as raw packet.
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*/
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return toeplitz_vhash(key, sizeof(key),
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/* ditto */
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&ip->ip_src, sizeof(ip->ip_src) * 2,
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NULL);
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}
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/*
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* Other protocols are treated as raw packets to apply RPS.
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*/
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default:
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return toeplitz_vhash(key, sizeof(key),
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/* ditto */
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&ip->ip_src, sizeof(ip->ip_src) * 2,
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NULL);
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}
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}
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/*
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* Calculate rss hash value from IPv6 mbuf.
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* This function should be called before ip6_input().
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*/
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uint32_t
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rss_toeplitz_hash_from_mbuf_ipv6(const struct mbuf *m, u_int flag)
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{
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struct ip6_hdr *ip6;
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int hlen;
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uint8_t key[RSS_KEYSIZE];
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KASSERT((m->m_flags & M_PKTHDR) != 0);
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KASSERT(m->m_len >= sizeof (struct ip6_hdr));
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ip6 = mtod(m, struct ip6_hdr *);
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KASSERT((ip6->ip6_vfc & IPV6_VERSION_MASK) == IPV6_VERSION);
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hlen = sizeof(struct ip6_hdr);
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rss_getkey(key);
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switch (ip6->ip6_nxt) {
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case IPPROTO_TCP:
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{
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if ((flag & RSS_TOEPLITZ_USE_TCP_PORT) != 0) {
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if (m->m_len >= hlen + sizeof(struct tcphdr)) {
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struct tcphdr *th;
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th = (struct tcphdr *)(mtod(m, char *) + hlen);
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return toeplitz_vhash(key, sizeof(key),
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/* ip6_src and ip6_dst in ip6_hdr must be sequential */
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&ip6->ip6_src, sizeof(ip6->ip6_src) * 2,
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/* th_sport and th_dport in tcphdr must be sequential */
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&th->th_sport, sizeof(th->th_sport) * 2,
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NULL);
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} else if (m->m_pkthdr.len >= hlen + sizeof(struct tcphdr)) {
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uint16_t ports[2];
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/* ditto */
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m_copydata(__UNCONST(m), hlen + offsetof(struct tcphdr, th_sport),
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sizeof(ports), ports);
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return toeplitz_vhash(key, sizeof(key),
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&ip6->ip6_src, sizeof(ip6->ip6_src) * 2,
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ports, sizeof(ports),
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NULL);
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}
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}
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/*
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* Treat as raw packet.
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*/
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return toeplitz_vhash(key, sizeof(key),
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&ip6->ip6_src, sizeof(ip6->ip6_src) * 2,
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NULL);
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}
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case IPPROTO_UDP:
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{
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if ((flag & RSS_TOEPLITZ_USE_UDP_PORT) != 0) {
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if (m->m_len >= hlen + sizeof(struct udphdr)) {
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struct udphdr *uh;
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uh = (struct udphdr *)(mtod(m, char *) + hlen);
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return toeplitz_vhash(key, sizeof(key),
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/* ip6_src and ip6_dst in ip6_hdr must sequential */
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&ip6->ip6_src, sizeof(ip6->ip6_src) * 2,
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/* uh_sport and uh_dport in udphdr must be sequential */
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&uh->uh_sport, sizeof(uh->uh_sport) * 2,
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NULL);
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} else if (m->m_pkthdr.len >= hlen + sizeof(struct udphdr)) {
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uint16_t ports[2];
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/* ditto */
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m_copydata(__UNCONST(m), hlen + offsetof(struct udphdr, uh_sport),
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sizeof(ports), ports);
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return toeplitz_vhash(key, sizeof(key),
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&ip6->ip6_src, sizeof(ip6->ip6_src) * 2,
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&ports, sizeof(ports),
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NULL);
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}
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}
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/*
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* Treat as raw packet.
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*/
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return toeplitz_vhash(key, sizeof(key),
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&ip6->ip6_src, sizeof(ip6->ip6_src) * 2,
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NULL);
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}
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/*
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* Other protocols are treated as raw packets to apply RPS.
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*/
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default:
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return toeplitz_vhash(key, sizeof(key),
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&ip6->ip6_src, sizeof(ip6->ip6_src) * 2,
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NULL);
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}
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return 0;
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}
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