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[src/trunk]: src/sys/net Add RSS toeplitz hash functions which calculate from...
details: https://anonhg.NetBSD.org/src/rev/b59b253a0063
branches: trunk
changeset: 987343:b59b253a0063
user: knakahara <knakahara%NetBSD.org@localhost>
date: Fri Sep 24 04:11:02 2021 +0000
description:
Add RSS toeplitz hash functions which calculate from mbuf.
diffstat:
sys/net/rss_config.c | 210 ++++++++++++++++++++++++++++++++++++++++++++++++++-
sys/net/rss_config.h | 8 +-
2 files changed, 215 insertions(+), 3 deletions(-)
diffs (256 lines):
diff -r 377a0705724f -r b59b253a0063 sys/net/rss_config.c
--- a/sys/net/rss_config.c Fri Sep 24 04:09:32 2021 +0000
+++ b/sys/net/rss_config.c Fri Sep 24 04:11:02 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: rss_config.c,v 1.2 2019/11/20 08:17:01 knakahara Exp $ */
+/* $NetBSD: rss_config.c,v 1.3 2021/09/24 04:11:02 knakahara Exp $ */
/*
* Copyright (c) 2018 Internet Initiative Japan Inc.
@@ -27,13 +27,21 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: rss_config.c,v 1.2 2019/11/20 08:17:01 knakahara Exp $");
+__KERNEL_RCSID(0, "$NetBSD: rss_config.c,v 1.3 2021/09/24 04:11:02 knakahara Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
+#include <sys/mbuf.h>
#include <net/rss_config.h>
+#include <net/toeplitz.h>
+
+#include <netinet/in.h>
+#include <netinet/ip.h>
+#include <netinet/tcp.h>
+#include <netinet/udp.h>
+#include <netinet/ip6.h>
/*
* Same as FreeBSD.
@@ -75,3 +83,201 @@
memcpy(key, rss_default_key, sizeof(rss_default_key));
}
+
+/*
+ * Calculate rss hash value from IPv4 mbuf.
+ * This function should be called before ip_input().
+ */
+uint32_t
+rss_toeplitz_hash_from_mbuf_ipv4(const struct mbuf *m, u_int flag)
+{
+ struct ip *ip;
+ int hlen;
+ uint8_t key[RSS_KEYSIZE];
+
+ KASSERT((m->m_flags & M_PKTHDR) != 0);
+ KASSERT(m->m_len >= sizeof (struct ip));
+
+ ip = mtod(m, struct ip *);
+ KASSERT(ip->ip_v == IPVERSION);
+
+ hlen = ip->ip_hl << 2;
+ if (hlen < sizeof(struct ip))
+ return 0;
+
+ rss_getkey(key);
+
+ switch (ip->ip_p) {
+ case IPPROTO_TCP:
+ {
+ if ((flag & RSS_TOEPLITZ_USE_TCP_PORT) != 0) {
+ if (m->m_len >= hlen + sizeof(struct tcphdr)) {
+ struct tcphdr *th;
+
+ th = (struct tcphdr *)(mtod(m, char *) + hlen);
+ return toeplitz_vhash(key, sizeof(key),
+ /* ip_src and ip_dst in struct ip must be sequential */
+ &ip->ip_src, sizeof(ip->ip_src) * 2,
+ /* th_sport and th_dport in tcphdr must be sequential */
+ &th->th_sport, sizeof(th->th_sport) * 2,
+ NULL);
+ } else if (m->m_pkthdr.len >= hlen + sizeof(struct tcphdr)) {
+ uint16_t ports[2];
+
+ /* ditto */
+ m_copydata(__UNCONST(m), hlen + offsetof(struct tcphdr, th_sport),
+ sizeof(ports), ports);
+ return toeplitz_vhash(key, sizeof(key),
+ &ip->ip_src, sizeof(ip->ip_src) * 2,
+ ports, sizeof(ports),
+ NULL);
+ }
+ }
+ /*
+ * Treat as raw packet.
+ */
+ return toeplitz_vhash(key, sizeof(key),
+ /* ditto */
+ &ip->ip_src, sizeof(ip->ip_src) * 2,
+ NULL);
+ }
+ case IPPROTO_UDP:
+ {
+ if ((flag & RSS_TOEPLITZ_USE_UDP_PORT) != 0) {
+ if (m->m_len >= hlen + sizeof(struct udphdr)) {
+ struct udphdr *uh;
+
+ uh = (struct udphdr *)(mtod(m, char *) + hlen);
+ return toeplitz_vhash(key, sizeof(key),
+ /* ip_src and ip_dst in struct ip must sequential */
+ &ip->ip_src, sizeof(ip->ip_src) * 2,
+ /* uh_sport and uh_dport in udphdr must be sequential */
+ &uh->uh_sport, sizeof(uh->uh_sport) * 2,
+ NULL);
+ } else if (m->m_pkthdr.len >= hlen + sizeof(struct udphdr)) {
+ uint16_t ports[2];
+
+ /* ditto */
+ m_copydata(__UNCONST(m), hlen + offsetof(struct udphdr, uh_sport),
+ sizeof(ports), ports);
+ return toeplitz_vhash(key, sizeof(key),
+ &ip->ip_src, sizeof(ip->ip_src) * 2,
+ ports, sizeof(ports),
+ NULL);
+ }
+ }
+ /*
+ * Treat as raw packet.
+ */
+ return toeplitz_vhash(key, sizeof(key),
+ /* ditto */
+ &ip->ip_src, sizeof(ip->ip_src) * 2,
+ NULL);
+ }
+ /*
+ * Other protocols are treated as raw packets to apply RPS.
+ */
+ default:
+ return toeplitz_vhash(key, sizeof(key),
+ /* ditto */
+ &ip->ip_src, sizeof(ip->ip_src) * 2,
+ NULL);
+ }
+}
+
+/*
+ * Calculate rss hash value from IPv6 mbuf.
+ * This function should be called before ip6_input().
+ */
+uint32_t
+rss_toeplitz_hash_from_mbuf_ipv6(const struct mbuf *m, u_int flag)
+{
+ struct ip6_hdr *ip6;
+ int hlen;
+ uint8_t key[RSS_KEYSIZE];
+
+ KASSERT((m->m_flags & M_PKTHDR) != 0);
+ KASSERT(m->m_len >= sizeof (struct ip6_hdr));
+
+ ip6 = mtod(m, struct ip6_hdr *);
+ KASSERT((ip6->ip6_vfc & IPV6_VERSION_MASK) == IPV6_VERSION);
+
+ hlen = sizeof(struct ip6_hdr);
+ rss_getkey(key);
+
+ switch (ip6->ip6_nxt) {
+ case IPPROTO_TCP:
+ {
+ if ((flag & RSS_TOEPLITZ_USE_TCP_PORT) != 0) {
+ if (m->m_len >= hlen + sizeof(struct tcphdr)) {
+ struct tcphdr *th;
+
+ th = (struct tcphdr *)(mtod(m, char *) + hlen);
+ return toeplitz_vhash(key, sizeof(key),
+ /* ip6_src and ip6_dst in ip6_hdr must be sequential */
+ &ip6->ip6_src, sizeof(ip6->ip6_src) * 2,
+ /* th_sport and th_dport in tcphdr must be sequential */
+ &th->th_sport, sizeof(th->th_sport) * 2,
+ NULL);
+ } else if (m->m_pkthdr.len >= hlen + sizeof(struct tcphdr)) {
+ uint16_t ports[2];
+
+ /* ditto */
+ m_copydata(__UNCONST(m), hlen + offsetof(struct tcphdr, th_sport),
+ sizeof(ports), ports);
+ return toeplitz_vhash(key, sizeof(key),
+ &ip6->ip6_src, sizeof(ip6->ip6_src) * 2,
+ ports, sizeof(ports),
+ NULL);
+ }
+ }
+ /*
+ * Treat as raw packet.
+ */
+ return toeplitz_vhash(key, sizeof(key),
+ &ip6->ip6_src, sizeof(ip6->ip6_src) * 2,
+ NULL);
+ }
+ case IPPROTO_UDP:
+ {
+ if ((flag & RSS_TOEPLITZ_USE_UDP_PORT) != 0) {
+ if (m->m_len >= hlen + sizeof(struct udphdr)) {
+ struct udphdr *uh;
+
+ uh = (struct udphdr *)(mtod(m, char *) + hlen);
+ return toeplitz_vhash(key, sizeof(key),
+ /* ip6_src and ip6_dst in ip6_hdr must sequential */
+ &ip6->ip6_src, sizeof(ip6->ip6_src) * 2,
+ /* uh_sport and uh_dport in udphdr must be sequential */
+ &uh->uh_sport, sizeof(uh->uh_sport) * 2,
+ NULL);
+ } else if (m->m_pkthdr.len >= hlen + sizeof(struct udphdr)) {
+ uint16_t ports[2];
+
+ /* ditto */
+ m_copydata(__UNCONST(m), hlen + offsetof(struct udphdr, uh_sport),
+ sizeof(ports), ports);
+ return toeplitz_vhash(key, sizeof(key),
+ &ip6->ip6_src, sizeof(ip6->ip6_src) * 2,
+ &ports, sizeof(ports),
+ NULL);
+ }
+ }
+ /*
+ * Treat as raw packet.
+ */
+ return toeplitz_vhash(key, sizeof(key),
+ &ip6->ip6_src, sizeof(ip6->ip6_src) * 2,
+ NULL);
+ }
+ /*
+ * Other protocols are treated as raw packets to apply RPS.
+ */
+ default:
+ return toeplitz_vhash(key, sizeof(key),
+ &ip6->ip6_src, sizeof(ip6->ip6_src) * 2,
+ NULL);
+ }
+
+ return 0;
+}
diff -r 377a0705724f -r b59b253a0063 sys/net/rss_config.h
--- a/sys/net/rss_config.h Fri Sep 24 04:09:32 2021 +0000
+++ b/sys/net/rss_config.h Fri Sep 24 04:11:02 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: rss_config.h,v 1.1 2018/02/16 04:48:32 knakahara Exp $ */
+/* $NetBSD: rss_config.h,v 1.2 2021/09/24 04:11:02 knakahara Exp $ */
/*
* Copyright (c) 2018 Internet Initiative Japan Inc.
@@ -31,6 +31,12 @@
#define RSS_KEYSIZE 40
+#define RSS_TOEPLITZ_USE_TCP_PORT __BIT(0)
+#define RSS_TOEPLITZ_USE_UDP_PORT __BIT(1)
+
void rss_getkey(uint8_t *);
+uint32_t rss_toeplitz_hash_from_mbuf_ipv4(const struct mbuf *, u_int);
+uint32_t rss_toeplitz_hash_from_mbuf_ipv6(const struct mbuf *, u_int);
+
#endif /* _NET_RSS_CONFIG_H_ */
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