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MFp4 bz_ipv6_fast:

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Defer checksum calulations on UDP6 output and respect the mbuf
  flags set by NICs having done checksum validation for us already,
  thus saving the computing time in the input path as well.

  Sponsored by:	The FreeBSD Foundation
  Sponsored by:	iXsystems

Reviewed by:	gnn (as part of the whole)
MFC After:	3 days
This commit is contained in:
Bjoern A. Zeeb 2012-05-25 02:19:17 +00:00
parent e7b92e2769
commit 5aa624a803
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=235959
1 changed files with 16 additions and 5 deletions
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21
sys/netinet6/udp6_usrreq.c
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@ -185,6 +185,7 @@ udp6_input(struct mbuf **mp, int *offp, int proto)
#ifdef IPFIREWALL_FORWARD
struct m_tag *fwd_tag;
#endif
uint16_t uh_sum;
ifp = m->m_pkthdr.rcvif;
ip6 = mtod(m, struct ip6_hdr *);
@ -228,7 +229,18 @@ udp6_input(struct mbuf **mp, int *offp, int proto)
UDPSTAT_INC(udps_nosum);
goto badunlocked;
}
if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
uh_sum = m->m_pkthdr.csum_data;
else
uh_sum = in6_cksum_pseudo(ip6, ulen,
IPPROTO_UDP, m->m_pkthdr.csum_data);
uh_sum ^= 0xffff;
} else
uh_sum = in6_cksum(m, IPPROTO_UDP, off, ulen);
if (uh_sum != 0) {
UDPSTAT_INC(udps_badsum);
goto badunlocked;
}
@ -771,10 +783,9 @@ udp6_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr6,
ip6->ip6_src = *laddr;
ip6->ip6_dst = *faddr;
if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP,
sizeof(struct ip6_hdr), plen)) == 0) {
udp6->uh_sum = 0xffff;
}
udp6->uh_sum = in6_cksum_pseudo(ip6, plen, IPPROTO_UDP, 0);
m->m_pkthdr.csum_flags = CSUM_UDP;
m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
flags = 0;