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Implement flowid calculation for outbound connections to balance

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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
This commit is contained in:
Alexander V. Chernikov 2020-10-18 17:15:47 +00:00
parent 186bcdaac7
commit 0c325f53f1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=366813
20 changed files with 311 additions and 76 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
sys/conf/files
View File

@ -4180,7 +4180,7 @@ net/rss_config.c optional inet rss | inet6 rss
net/rtsock.c standard
net/slcompress.c optional netgraph_vjc | sppp | \
netgraph_sppp
net/toeplitz.c optional inet rss | inet6 rss
net/toeplitz.c optional inet rss | inet6 rss | route_mpath
net/vnet.c optional vimage
net80211/ieee80211.c optional wlan
net80211/ieee80211_acl.c optional wlan wlan_acl

17
sys/net/radix.c
View File

@ -624,21 +624,6 @@ rn_addroute(void *v_arg, void *n_arg, struct radix_head *head,
saved_tt = tt = rn_insert(v, head, &keyduplicated, treenodes);
if (keyduplicated) {
for (t = tt; tt; t = tt, tt = tt->rn_dupedkey) {
#ifdef RADIX_MPATH
/* permit multipath, if enabled for the family */
if (rn_mpath_capable(head) && netmask == tt->rn_mask) {
/*
* go down to the end of multipaths, so that
* new entry goes into the end of rn_dupedkey
* chain.
*/
do {
t = tt;
tt = tt->rn_dupedkey;
} while (tt && t->rn_mask == tt->rn_mask);
break;
}
#endif
if (tt->rn_mask == netmask)
return (0);
if (netmask == 0 ||
@ -744,10 +729,8 @@ on2:
if (m->rm_flags & RNF_NORMAL) {
mmask = m->rm_leaf->rn_mask;
if (tt->rn_flags & RNF_NORMAL) {
#if !defined(RADIX_MPATH)
log(LOG_ERR,
"Non-unique normal route, mask not entered\n");
#endif
return (tt);
}
} else

34
sys/net/route.h
View File

@ -125,8 +125,42 @@ VNET_DECLARE(uint32_t, _rt_numfibs); /* number of existing route tables */
#define rt_numfibs V_rt_numfibs
VNET_DECLARE(u_int, rt_add_addr_allfibs); /* Announce interfaces to all fibs */
#define V_rt_add_addr_allfibs VNET(rt_add_addr_allfibs)
/* Calculate flowid for locally-originated packets */
#define V_fib_hash_outbound VNET(fib_hash_outbound)
VNET_DECLARE(u_int, fib_hash_outbound);
/* Outbound flowid generation rules */
#ifdef RSS
#define fib4_calc_packet_hash xps_proto_software_hash_v4
#define fib6_calc_packet_hash xps_proto_software_hash_v6
#define CALC_FLOWID_OUTBOUND_SENDTO true
#ifdef ROUTE_MPATH
#define CALC_FLOWID_OUTBOUND V_fib_hash_outbound
#else
#define CALC_FLOWID_OUTBOUND false
#endif
#else /* !RSS */
#define fib4_calc_packet_hash fib4_calc_software_hash
#define fib6_calc_packet_hash fib6_calc_software_hash
#ifdef ROUTE_MPATH
#define CALC_FLOWID_OUTBOUND_SENDTO V_fib_hash_outbound
#define CALC_FLOWID_OUTBOUND V_fib_hash_outbound
#else
#define CALC_FLOWID_OUTBOUND_SENDTO false
#define CALC_FLOWID_OUTBOUND false
#endif
#endif /* RSS */
#endif /* _KERNEL */
/*
* We distinguish between routes to hosts and routes to networks,
* preferring the former if available. For each route we infer

25
sys/net/route/mpath_ctl.c
View File

@ -64,6 +64,20 @@
*/
SYSCTL_DECL(_net_route);
VNET_DEFINE(u_int, fib_hash_outbound) = 0;
SYSCTL_UINT(_net_route, OID_AUTO, hash_outbound, CTLFLAG_RD | CTLFLAG_VNET,
&VNET_NAME(fib_hash_outbound), 0,
"Compute flowid for locally-originated packets");
/* Default entropy to add to the hash calculation for the outbound connections*/
uint8_t mpath_entropy_key[MPATH_ENTROPY_KEY_LEN] = {
0x6d, 0x5a, 0x56, 0xda, 0x25, 0x5b, 0x0e, 0xc2,
0x41, 0x67, 0x25, 0x3d, 0x43, 0xa3, 0x8f, 0xb0,
0xd0, 0xca, 0x2b, 0xcb, 0xae, 0x7b, 0x30, 0xb4,
0x77, 0xcb, 0x2d, 0xa3, 0x80, 0x30, 0xf2, 0x0c,
0x6a, 0x42, 0xb7, 0x3b, 0xbe, 0xac, 0x01, 0xfa,
};
/*
* Tries to add @rnd_add nhop to the existing set of nhops (@nh_orig) for the
@ -115,6 +129,17 @@ add_route_mpath(struct rib_head *rnh, struct rt_addrinfo *info,
RTSTAT_INC(rts_add_retry);
}
if (V_fib_hash_outbound == 0 && error == 0 &&
NH_IS_NHGRP(rc->rc_nh_new)) {
/*
* First multipath route got installed. Enable local
* outbound connections hashing.
*/
if (bootverbose)
printf("FIB: enabled flowid calculation for locally-originated packets\n");
V_fib_hash_outbound = 1;
}
return (error);
}

4
sys/net/route/route_var.h
View File

@ -307,4 +307,8 @@ int nhgrp_get_addition_group(struct rib_head *rnh,
void nhgrp_free(struct nhgrp_object *nhg);
/* Entropy data used for outbound hashing */
#define MPATH_ENTROPY_KEY_LEN 40
extern uint8_t mpath_entropy_key[MPATH_ENTROPY_KEY_LEN];
#endif

35
sys/netinet/in_fib.c
View File

@ -50,6 +50,7 @@ __FBSDID("$FreeBSD$");
#include <net/route/route_ctl.h>
#include <net/route/route_var.h>
#include <net/route/nhop.h>
#include <net/toeplitz.h>
#include <net/vnet.h>
#include <netinet/in.h>
@ -62,6 +63,40 @@ __FBSDID("$FreeBSD$");
/* Assert 'struct route_in' is compatible with 'struct route' */
CHK_STRUCT_ROUTE_COMPAT(struct route_in, ro_dst4);
#ifdef ROUTE_MPATH
struct _hash_5tuple_ipv4 {
struct in_addr src;
struct in_addr dst;
unsigned short src_port;
unsigned short dst_port;
char proto;
char spare[3];
};
_Static_assert(sizeof(struct _hash_5tuple_ipv4) == 16,
"_hash_5tuple_ipv4 size is wrong");
uint32_t
fib4_calc_software_hash(struct in_addr src, struct in_addr dst,
unsigned short src_port, unsigned short dst_port, char proto,
uint32_t *phashtype)
{
struct _hash_5tuple_ipv4 data;
data.src = src;
data.dst = dst;
data.src_port = src_port;
data.dst_port = dst_port;
data.proto = proto;
data.spare[0] = data.spare[1] = data.spare[2] = 0;
*phashtype = M_HASHTYPE_OPAQUE;
return (toeplitz_hash(MPATH_ENTROPY_KEY_LEN, mpath_entropy_key,
sizeof(data), (uint8_t *)&data));
}
#endif
/*
* Looks up path in fib @fibnum specified by @dst.
* Returns path nexthop on success. Nexthop is safe to use

3
sys/netinet/in_fib.h
View File

@ -51,4 +51,7 @@ int fib4_check_urpf(uint32_t fibnum, struct in_addr dst, uint32_t scopeid,
uint32_t flags, const struct ifnet *src_if);
struct nhop_object *fib4_lookup_debugnet(uint32_t fibnum, struct in_addr dst,
uint32_t scopeid, uint32_t flags);
uint32_t fib4_calc_software_hash(struct in_addr src, struct in_addr dst,
unsigned short src_port, unsigned short dst_port, char proto,
uint32_t *phashtype);
#endif

11
sys/netinet/in_pcb.c
View File

@ -46,6 +46,7 @@ __FBSDID("$FreeBSD$");
#include "opt_inet6.h"
#include "opt_ratelimit.h"
#include "opt_pcbgroup.h"
#include "opt_route.h"
#include "opt_rss.h"
#include <sys/param.h>
@ -1327,7 +1328,17 @@ in_pcbconnect_setup(struct inpcb *inp, struct sockaddr *nam,
lport = *lportp;
faddr = sin->sin_addr;
fport = sin->sin_port;
#ifdef ROUTE_MPATH
if (CALC_FLOWID_OUTBOUND) {
uint32_t hash_val, hash_type;
hash_val = fib4_calc_software_hash(laddr, faddr, 0, fport,
inp->inp_socket->so_proto->pr_protocol, &hash_type);
inp->inp_flowid = hash_val;
inp->inp_flowtype = hash_type;
}
#endif
if (!CK_STAILQ_EMPTY(&V_in_ifaddrhead)) {
/*
* If the destination address is INADDR_ANY,

42
sys/netinet/in_rss.c
View File

@ -151,6 +151,48 @@ rss_proto_software_hash_v4(struct in_addr s, struct in_addr d,
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.
*

2
sys/netinet/in_rss.h
View File

@ -53,5 +53,7 @@ int rss_proto_software_hash_v4(struct in_addr src,
uint32_t *hashtype);
struct mbuf * rss_soft_m2cpuid_v4(struct mbuf *m, uintptr_t source,
u_int *cpuid);
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);
#endif /* !_NETINET_IN_RSS_H_ */

23
sys/netinet/raw_ip.c
View File

@ -38,6 +38,7 @@ __FBSDID("$FreeBSD$");
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include "opt_route.h"
#include <sys/param.h>
#include <sys/jail.h>
@ -67,6 +68,7 @@ __FBSDID("$FreeBSD$");
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_fib.h>
#include <netinet/in_pcb.h>
#include <netinet/in_var.h>
#include <netinet/if_ether.h>
@ -484,6 +486,17 @@ rip_output(struct mbuf *m, struct socket *so, ...)
ip->ip_len = htons(m->m_pkthdr.len);
ip->ip_src = inp->inp_laddr;
ip->ip_dst.s_addr = dst;
#ifdef ROUTE_MPATH
if (CALC_FLOWID_OUTBOUND) {
uint32_t hash_type, hash_val;
hash_val = fib4_calc_software_hash(ip->ip_src,
ip->ip_dst, 0, 0, ip->ip_p, &hash_type);
m->m_pkthdr.flowid = hash_val;
M_HASHTYPE_SET(m, hash_type);
flags |= IP_NODEFAULTFLOWID;
}
#endif
if (jailed(inp->inp_cred)) {
/*
* prison_local_ip4() would be good enough but would
@ -519,7 +532,17 @@ rip_output(struct mbuf *m, struct socket *so, ...)
return (EINVAL);
ip = mtod(m, struct ip *);
}
#ifdef ROUTE_MPATH
if (CALC_FLOWID_OUTBOUND) {
uint32_t hash_type, hash_val;
hash_val = fib4_calc_software_hash(ip->ip_dst,
ip->ip_src, 0, 0, ip->ip_p, &hash_type);
m->m_pkthdr.flowid = hash_val;
M_HASHTYPE_SET(m, hash_type);
flags |= IP_NODEFAULTFLOWID;
}
#endif
INP_RLOCK(inp);
/*
* Don't allow both user specified and setsockopt options,

28
sys/netinet/udp_usrreq.c
View File

@ -44,6 +44,7 @@ __FBSDID("$FreeBSD$");
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include "opt_route.h"
#include "opt_rss.h"
#include <sys/param.h>
@ -76,6 +77,7 @@ __FBSDID("$FreeBSD$");
#include <netinet/in.h>
#include <netinet/in_kdtrace.h>
#include <netinet/in_fib.h>
#include <netinet/in_pcb.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
@ -1483,31 +1485,15 @@ udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr,
m->m_pkthdr.flowid = flowid;
M_HASHTYPE_SET(m, flowtype);
}
#ifdef RSS
else {
#if defined(ROUTE_MPATH) || defined(RSS)
else if (CALC_FLOWID_OUTBOUND_SENDTO) {
uint32_t hash_val, hash_type;
/*
* Calculate an appropriate RSS hash for UDP and
* UDP Lite.
*
* The called function will take care of figuring out
* whether a 2-tuple or 4-tuple hash is required based
* on the currently configured scheme.
*
* Later later on connected socket values should be
* cached in the inpcb and reused, rather than constantly
* re-calculating it.
*
* UDP Lite is a different protocol number and will
* likely end up being hashed as a 2-tuple until
* RSS / NICs grow UDP Lite protocol awareness.
*/
if (rss_proto_software_hash_v4(faddr, laddr, fport, lport,
pr, &hash_val, &hash_type) == 0) {
hash_val = fib4_calc_packet_hash(laddr, faddr,
lport, fport, pr, &hash_type);
m->m_pkthdr.flowid = hash_val;
M_HASHTYPE_SET(m, hash_type);
}
}
/*
* Don't override with the inp cached flowid value.

34
sys/netinet6/in6_fib.c
View File

@ -51,6 +51,7 @@ __FBSDID("$FreeBSD$");
#include <net/route/route_ctl.h>
#include <net/route/route_var.h>
#include <net/route/nhop.h>
#include <net/toeplitz.h>
#include <net/vnet.h>
#include <netinet/in.h>
@ -68,6 +69,39 @@ __FBSDID("$FreeBSD$");
CHK_STRUCT_ROUTE_COMPAT(struct route_in6, ro_dst);
#ifdef ROUTE_MPATH
struct _hash_5tuple_ipv6 {
struct in6_addr src;
struct in6_addr dst;
unsigned short src_port;
unsigned short dst_port;
char proto;
char spare[3];
};
_Static_assert(sizeof(struct _hash_5tuple_ipv6) == 40,
"_hash_5tuple_ipv6 size is wrong");
uint32_t
fib6_calc_software_hash(const struct in6_addr *src, const struct in6_addr *dst,
unsigned short src_port, unsigned short dst_port, char proto,
uint32_t *phashtype)
{
struct _hash_5tuple_ipv6 data;
data.src = *src;
data.dst = *dst;
data.src_port = src_port;
data.dst_port = dst_port;
data.proto = proto;
data.spare[0] = data.spare[1] = data.spare[2] = 0;
*phashtype = M_HASHTYPE_OPAQUE_HASH;
return (toeplitz_hash(MPATH_ENTROPY_KEY_LEN, mpath_entropy_key,
sizeof(data), (uint8_t *)&data));
}
#endif
/*
* Looks up path in fib @fibnum specified by @dst.
* Assumes scope is deembedded and provided in @scopeid.

3
sys/netinet6/in6_fib.h
View File

@ -39,4 +39,7 @@ int fib6_check_urpf(uint32_t fibnum, const struct in6_addr *dst6,
uint32_t scopeid, uint32_t flags, const struct ifnet *src_if);
struct nhop_object *fib6_lookup_debugnet(uint32_t fibnum,
const struct in6_addr *dst6, uint32_t scopeid, uint32_t flags);
uint32_t fib6_calc_software_hash(const struct in6_addr *src,
const struct in6_addr *dst, unsigned short src_port, unsigned short dst_port,
char proto, uint32_t *phashtype);
#endif

12
sys/netinet6/in6_pcb.c
View File

@ -73,6 +73,7 @@ __FBSDID("$FreeBSD$");
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include "opt_pcbgroup.h"
#include "opt_route.h"
#include "opt_rss.h"
#include <sys/param.h>
@ -423,6 +424,17 @@ in6_pcbconnect_mbuf(struct inpcb *inp, struct sockaddr *nam,
INP_WLOCK_ASSERT(inp);
INP_HASH_WLOCK_ASSERT(pcbinfo);
#ifdef ROUTE_MPATH
if (CALC_FLOWID_OUTBOUND) {
uint32_t hash_type, hash_val;
hash_val = fib6_calc_software_hash(&inp->in6p_laddr,
&sin6->sin6_addr, 0, sin6->sin6_port,
inp->inp_socket->so_proto->pr_protocol, &hash_type);
inp->inp_flowid = hash_val;
inp->inp_flowtype = hash_type;
}
#endif
/*
* Call inner routine, to assign local interface address.
* in6_pcbladdr() may automatically fill in sin6_scope_id.

44
sys/netinet6/in6_rss.c
View File

@ -152,6 +152,50 @@ rss_proto_software_hash_v6(const struct in6_addr *s, const struct in6_addr *d,
return (-1);
}
/*
* Calculate an appropriate ipv6 2-tuple or 4-tuple given the given
* IPv6 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 "outgoin" packet order (ie, destination is "far" address.)
*/
uint32_t
xps_proto_software_hash_v6(const struct in6_addr *s, const struct in6_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_IPV6)) {
hash = rss_hash_ip6_4tuple(d, dp, s, sp);
*hashtype = M_HASHTYPE_RSS_TCP_IPV6;
return (hash);
} else if ((proto == IPPROTO_UDP) &&
(rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6)) {
hash = rss_hash_ip6_4tuple(d, dp, s, sp);
*hashtype = M_HASHTYPE_RSS_UDP_IPV6;
return (hash);
} else if (rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) {
/* RSS doesn't hash on other protocols like SCTP; so 2-tuple */
hash = rss_hash_ip6_2tuple(d, s);
*hashtype = M_HASHTYPE_RSS_IPV6;
return (hash);
}
*hashtype = M_HASHTYPE_NONE;
return (0);
}
/*
* Do a software calculation of the RSS for the given mbuf.
*

3
sys/netinet6/in6_rss.h
View File

@ -54,5 +54,8 @@ int rss_proto_software_hash_v6(const struct in6_addr *src,
uint32_t *hashtype);
struct mbuf * rss_soft_m2cpuid_v6(struct mbuf *m, uintptr_t source,
u_int *cpuid);
uint32_t xps_proto_software_hash_v6(const struct in6_addr *s,
const struct in6_addr *d, u_short sp, u_short dp,
int proto, uint32_t *hashtype);
#endif /* !_NETINET6_IN6_RSS_H_ */

6
sys/netinet6/ip6_output.c
View File

@ -419,9 +419,6 @@ done:
*
* ifpp - XXX: just for statistics
*/
/*
* XXX TODO: no flowid is assigned for outbound flows?
*/
int
ip6_output(struct mbuf *m0, struct ip6_pktopts *opt,
struct route_in6 *ro, int flags, struct ip6_moptions *im6o,
@ -775,7 +772,8 @@ again:
}
}
nh = fib6_lookup(fibnum, &kdst, scopeid, NHR_NONE, 0);
nh = fib6_lookup(fibnum, &kdst, scopeid, NHR_NONE,
m->m_pkthdr.flowid);
if (nh == NULL) {
IP6STAT_INC(ip6s_noroute);
/* No ifp in6_ifstat_inc(ifp, ifs6_out_discard); */

13
sys/netinet6/raw_ip6.c
View File

@ -66,6 +66,7 @@ __FBSDID("$FreeBSD$");
#include "opt_ipsec.h"
#include "opt_inet6.h"
#include "opt_route.h"
#include <sys/param.h>
#include <sys/errno.h>
@ -103,6 +104,7 @@ __FBSDID("$FreeBSD$");
#include <netinet6/ip6_var.h>
#include <netinet6/nd6.h>
#include <netinet6/raw_ip6.h>
#include <netinet6/in6_fib.h>
#include <netinet6/scope6_var.h>
#include <netinet6/send.h>
@ -462,6 +464,17 @@ rip6_output(struct mbuf *m, struct socket *so, ...)
}
ip6 = mtod(m, struct ip6_hdr *);
#ifdef ROUTE_MPATH
if (CALC_FLOWID_OUTBOUND) {
uint32_t hash_type, hash_val;
hash_val = fib6_calc_software_hash(&inp->in6p_laddr,
&dstsock->sin6_addr, 0, 0, so->so_proto->pr_protocol,
&hash_type);
inp->inp_flowid = hash_val;
inp->inp_flowtype = hash_type;
}
#endif
/*
* Source address selection.
*/

38
sys/netinet6/udp6_usrreq.c
View File

@ -75,6 +75,7 @@ __FBSDID("$FreeBSD$");
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include "opt_route.h"
#include "opt_rss.h"
#include <sys/param.h>
@ -115,6 +116,7 @@ __FBSDID("$FreeBSD$");
#include <netinet6/ip6protosw.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_fib.h>
#include <netinet6/in6_pcb.h>
#include <netinet6/in6_rss.h>
#include <netinet6/udp6_var.h>
@ -954,42 +956,20 @@ udp6_output(struct socket *so, int flags_arg, struct mbuf *m,
}
flags = 0;
#ifdef RSS
{
uint32_t hash_val, hash_type;
#if defined(ROUTE_MPATH) || defined(RSS)
if (CALC_FLOWID_OUTBOUND_SENDTO) {
uint32_t hash_type, hash_val;
uint8_t pr;
pr = inp->inp_socket->so_proto->pr_protocol;
/*
* Calculate an appropriate RSS hash for UDP and
* UDP Lite.
*
* The called function will take care of figuring out
* whether a 2-tuple or 4-tuple hash is required based
* on the currently configured scheme.
*
* Later later on connected socket values should be
* cached in the inpcb and reused, rather than constantly
* re-calculating it.
*
* UDP Lite is a different protocol number and will
* likely end up being hashed as a 2-tuple until
* RSS / NICs grow UDP Lite protocol awareness.
*/
if (rss_proto_software_hash_v6(faddr, laddr, fport,
inp->inp_lport, pr, &hash_val, &hash_type) == 0) {
hash_val = fib6_calc_packet_hash(laddr, faddr,
inp->inp_lport, fport, pr, &hash_type);
m->m_pkthdr.flowid = hash_val;
M_HASHTYPE_SET(m, hash_type);
}
/*
* Don't override with the inp cached flowid.
*
* Until the whole UDP path is vetted, it may actually
* be incorrect.
*/
/* do not use inp flowid */
flags |= IP_NODEFAULTFLOWID;
}
#endif
UDPSTAT_INC(udps_opackets);