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Implement mbuf hashing routines for IP over infiniband, IPoIB.

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No functional change intended.

Differential Revision:	https://reviews.freebsd.org/D26254
Reviewed by:		melifaro@
MFC after:		1 week
Sponsored by:		Mellanox Technologies // NVIDIA Networking
This commit is contained in:
Hans Petter Selasky 2020-10-22 09:17:56 +00:00
parent 9d40cf60d6
commit 2ae634c6db
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=366931
2 changed files with 79 additions and 40 deletions
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113
sys/kern/uipc_mbufhash.c
View File

@ -28,6 +28,7 @@ __FBSDID("$FreeBSD$");
#include <sys/fnv_hash.h>
#include <net/ethernet.h>
#include <net/infiniband.h>
#if defined(INET) || defined(INET6)
#include <netinet/in.h>
@ -42,7 +43,7 @@ __FBSDID("$FreeBSD$");
#endif
static const void *
m_ether_tcpip_hash_gethdr(const struct mbuf *m, const u_int off,
m_common_hash_gethdr(const struct mbuf *m, const u_int off,
const u_int len, void *buf)
{
@ -65,9 +66,19 @@ m_ether_tcpip_hash_init(void)
}
uint32_t
m_ether_tcpip_hash(const uint32_t flags, const struct mbuf *m,
const uint32_t key)
m_infiniband_tcpip_hash_init(void)
{
uint32_t seed;
seed = arc4random();
return (fnv_32_buf(&seed, sizeof(seed), FNV1_32_INIT));
}
static inline uint32_t
m_tcpip_hash(const uint32_t flags, const struct mbuf *m,
uint32_t p, int off, const uint16_t etype)
{
#if defined(INET) || defined(INET6)
union {
#ifdef INET
struct ip ip;
@ -75,49 +86,19 @@ m_ether_tcpip_hash(const uint32_t flags, const struct mbuf *m,
#ifdef INET6
struct ip6_hdr ip6;
#endif
struct ether_vlan_header vlan;
uint32_t port;
} buf;
const struct ether_header *eh;
const struct ether_vlan_header *vlan;
#ifdef INET
const struct ip *ip;
#endif
#ifdef INET6
const struct ip6_hdr *ip6;
#endif
uint32_t p;
int off;
uint16_t etype;
p = key;
off = sizeof(*eh);
if (m->m_len < off)
goto done;
eh = mtod(m, struct ether_header *);
etype = ntohs(eh->ether_type);
if (flags & MBUF_HASHFLAG_L2) {
p = fnv_32_buf(&eh->ether_shost, ETHER_ADDR_LEN, p);
p = fnv_32_buf(&eh->ether_dhost, ETHER_ADDR_LEN, p);
}
/* Special handling for encapsulating VLAN frames */
if ((m->m_flags & M_VLANTAG) && (flags & MBUF_HASHFLAG_L2)) {
p = fnv_32_buf(&m->m_pkthdr.ether_vtag,
sizeof(m->m_pkthdr.ether_vtag), p);
} else if (etype == ETHERTYPE_VLAN) {
vlan = m_ether_tcpip_hash_gethdr(m, off, sizeof(*vlan), &buf);
if (vlan == NULL)
goto done;
if (flags & MBUF_HASHFLAG_L2)
p = fnv_32_buf(&vlan->evl_tag, sizeof(vlan->evl_tag), p);
etype = ntohs(vlan->evl_proto);
off += sizeof(*vlan) - sizeof(*eh);
}
#endif
switch (etype) {
#ifdef INET
case ETHERTYPE_IP:
ip = m_ether_tcpip_hash_gethdr(m, off, sizeof(*ip), &buf);
ip = m_common_hash_gethdr(m, off, sizeof(*ip), &buf);
if (ip == NULL)
break;
if (flags & MBUF_HASHFLAG_L3) {
@ -136,7 +117,7 @@ m_ether_tcpip_hash(const uint32_t flags, const struct mbuf *m,
if (iphlen < sizeof(*ip))
break;
off += iphlen;
ports = m_ether_tcpip_hash_gethdr(m,
ports = m_common_hash_gethdr(m,
off, sizeof(*ports), &buf);
if (ports == NULL)
break;
@ -150,7 +131,7 @@ m_ether_tcpip_hash(const uint32_t flags, const struct mbuf *m,
#endif
#ifdef INET6
case ETHERTYPE_IPV6:
ip6 = m_ether_tcpip_hash_gethdr(m, off, sizeof(*ip6), &buf);
ip6 = m_common_hash_gethdr(m, off, sizeof(*ip6), &buf);
if (ip6 == NULL)
break;
if (flags & MBUF_HASHFLAG_L3) {
@ -169,6 +150,62 @@ m_ether_tcpip_hash(const uint32_t flags, const struct mbuf *m,
default:
break;
}
done:
return (p);
}
uint32_t
m_ether_tcpip_hash(const uint32_t flags, const struct mbuf *m,
uint32_t p)
{
union {
struct ether_vlan_header vlan;
} buf;
const struct ether_header *eh;
const struct ether_vlan_header *vlan;
int off;
uint16_t etype;
off = sizeof(*eh);
if (m->m_len < off)
return (p);
eh = mtod(m, struct ether_header *);
etype = ntohs(eh->ether_type);
if (flags & MBUF_HASHFLAG_L2) {
p = fnv_32_buf(&eh->ether_shost, ETHER_ADDR_LEN, p);
p = fnv_32_buf(&eh->ether_dhost, ETHER_ADDR_LEN, p);
}
/* Special handling for encapsulating VLAN frames */
if ((m->m_flags & M_VLANTAG) && (flags & MBUF_HASHFLAG_L2)) {
p = fnv_32_buf(&m->m_pkthdr.ether_vtag,
sizeof(m->m_pkthdr.ether_vtag), p);
} else if (etype == ETHERTYPE_VLAN) {
vlan = m_common_hash_gethdr(m, off, sizeof(*vlan), &buf);
if (vlan == NULL)
return (p);
if (flags & MBUF_HASHFLAG_L2)
p = fnv_32_buf(&vlan->evl_tag, sizeof(vlan->evl_tag), p);
etype = ntohs(vlan->evl_proto);
off += sizeof(*vlan) - sizeof(*eh);
}
return (m_tcpip_hash(flags, m, p, off, etype));
}
uint32_t
m_infiniband_tcpip_hash(const uint32_t flags, const struct mbuf *m,
uint32_t p)
{
const struct infiniband_header *ibh;
int off;
uint16_t etype;
off = sizeof(*ibh);
if (m->m_len < off)
return (p);
ibh = mtod(m, struct infiniband_header *);
etype = ntohs(ibh->ib_protocol);
if (flags & MBUF_HASHFLAG_L2)
p = fnv_32_buf(&ibh->ib_hwaddr, INFINIBAND_ADDR_LEN, p);
return (m_tcpip_hash(flags, m, p, off, etype));
}

6
sys/sys/mbuf.h
View File

@ -1455,14 +1455,16 @@ rt_m_getfib(struct mbuf *m)
((_m)->m_pkthdr.fibnum) = (_fib); \
} while (0)
/* flags passed as first argument for "m_ether_tcpip_hash()" */
/* flags passed as first argument for "m_xxx_tcpip_hash()" */
#define MBUF_HASHFLAG_L2 (1 << 2)
#define MBUF_HASHFLAG_L3 (1 << 3)
#define MBUF_HASHFLAG_L4 (1 << 4)
/* mbuf hashing helper routines */
uint32_t m_ether_tcpip_hash_init(void);
uint32_t m_ether_tcpip_hash(const uint32_t, const struct mbuf *, const uint32_t);
uint32_t m_ether_tcpip_hash(const uint32_t, const struct mbuf *, uint32_t);
uint32_t m_infiniband_tcpip_hash_init(void);
uint32_t m_infiniband_tcpip_hash(const uint32_t, const struct mbuf *, uint32_t);
#ifdef MBUF_PROFILING
void m_profile(struct mbuf *m);