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Implement the IPv6 RSS software hash function.

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This isn't yet linked into the receive/transmit paths anywhere just yet.

This is part of a GSoC 2015 project.

Submitted by:	Tiwei Bie <btw@mail.ustc.edu.cn>
Reviewed by:	hiren, gnn
Differential Revision:	https://reviews.freebsd.org/D3423
This commit is contained in:
Adrian Chadd 2015-08-24 05:36:08 +00:00
parent f34065a7fd
commit 20dbdf88a5
2 changed files with 57 additions and 0 deletions
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49
sys/netinet6/in6_rss.c
View File

@ -101,3 +101,52 @@ rss_hash_ip6_4tuple(const struct in6_addr *src, u_short srcport,
datalen += sizeof(dstport);
return (rss_hash(datalen, data));
}
/*
* 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.
*
* 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_v6(const struct in6_addr *s, const struct in6_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_IPV6)) {
hash = rss_hash_ip6_4tuple(s, sp, d, dp);
*hashval = hash;
*hashtype = M_HASHTYPE_RSS_TCP_IPV6;
return (0);
} else if ((proto == IPPROTO_UDP) &&
(rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6)) {
hash = rss_hash_ip6_4tuple(s, sp, d, dp);
*hashval = hash;
*hashtype = M_HASHTYPE_RSS_UDP_IPV6;
return (0);
} 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(s, d);
*hashval = hash;
*hashtype = M_HASHTYPE_RSS_IPV6;
return (0);
}
/* No configured available hashtypes! */
printf("%s: no available hashtypes!\n", __func__);
return (-1);
}

8
sys/netinet6/in6_rss.h
View File

@ -42,4 +42,12 @@ uint32_t rss_hash_ip6_4tuple(const struct in6_addr *src, u_short srcport,
uint32_t rss_hash_ip6_2tuple(const struct in6_addr *src,
const struct in6_addr *dst);
/*
* Functions to calculate a software RSS hash for a given mbuf or
* packet detail.
*/
int rss_proto_software_hash_v6(const struct in6_addr *src,
const struct in6_addr *dst, u_short src_port,
u_short dst_port, int proto, uint32_t *hashval,
uint32_t *hashtype);
#endif /* !_NETINET6_IN6_RSS_H_ */