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Optimized in4_cksum().

This commit is contained in:
thorpej 2001-04-29 03:29:21 +00:00
parent acc17cc823
commit cee702b869
2 changed files with 64 additions and 15 deletions
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76
sys/arch/alpha/alpha/in_cksum.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: in_cksum.c,v 1.7 1997/09/02 13:18:15 thorpej Exp $ */
/* $NetBSD: in_cksum.c,v 1.8 2001/04/29 03:29:21 thorpej Exp $ */
/*
* Copyright (c) 1988, 1992, 1993
@ -39,12 +39,15 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: in_cksum.c,v 1.7 1997/09/02 13:18:15 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: in_cksum.c,v 1.8 2001/04/29 03:29:21 thorpej Exp $");
#include <sys/param.h>
#include <sys/mbuf.h>
#include <sys/systm.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
/*
* Checksum routine for Internet Protocol family headers
@ -86,12 +89,8 @@ union q_util {
u_int64_t q;
};
u_int64_t in_cksumdata __P((caddr_t buf, int len));
u_int64_t
in_cksumdata(buf, len)
register caddr_t buf;
register int len;
static u_int64_t
in_cksumdata(register caddr_t buf, register int len)
{
const u_int32_t *lw = (u_int32_t *) buf;
u_int64_t sum = 0;
@ -172,9 +171,7 @@ in_cksumdata(buf, len)
}
int
in_cksum(m, len)
register struct mbuf *m;
register int len;
in_cksum(register struct mbuf *m, register int len)
{
register u_int64_t sum = 0;
register int mlen = 0;
@ -191,9 +188,62 @@ in_cksum(m, len)
mlen = len;
addr = mtod(m, caddr_t);
if ((clen ^ (long) addr) & 1)
sum += in_cksumdata(addr, mlen) << 8;
sum += in_cksumdata(addr, mlen) << 8;
else
sum += in_cksumdata(addr, mlen);
sum += in_cksumdata(addr, mlen);
clen += mlen;
len -= mlen;
}
REDUCE16;
return (~sum & 0xffff);
}
int
in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len)
{
register u_int64_t sum = 0;
register int mlen = 0;
register int clen = 0;
register caddr_t addr;
union q_util q_util;
union l_util l_util;
struct ipovly ipov;
/* pseudo header */
if (off < sizeof(struct ipovly))
panic("in4_cksum: offset too short");
if (m->m_len < sizeof(struct ip))
panic("in4_cksum: bad mbuf chain");
memset(&ipov, 0, sizeof(ipov));
ipov.ih_len = htons(len);
ipov.ih_pr = nxt;
ipov.ih_src = mtod(m, struct ip *)->ip_src;
ipov.ih_dst = mtod(m, struct ip *)->ip_dst;
sum += in_cksumdata((caddr_t) &ipov, sizeof(ipov));
/* skip over unnecessary part */
while (m != NULL && off > 0) {
if (m->m_len > off)
break;
off -= m->m_len;
m = m->m_next;
}
for (; m && len; m = m->m_next, off = 0) {
if (m->m_len == 0)
continue;
mlen = m->m_len - off;
if (len < mlen)
mlen = len;
addr = mtod(m, caddr_t) + off;
if ((clen ^ (long) addr) & 1)
sum += in_cksumdata(addr, mlen) << 8;
else
sum += in_cksumdata(addr, mlen);
clen += mlen;
len -= mlen;

3
sys/arch/alpha/conf/files.alpha
View File

@ -1,4 +1,4 @@
# $NetBSD: files.alpha,v 1.137 2001/04/28 06:10:50 thorpej Exp $
# $NetBSD: files.alpha,v 1.138 2001/04/29 03:29:22 thorpej Exp $
#
# alpha-specific configuration info
@ -505,7 +505,6 @@ file dev/cons.c
# Network protocol checksum routines
file arch/alpha/alpha/in_cksum.c inet
file netinet/in4_cksum.c inet
file netns/ns_cksum.c ns
# PROM console support (for ports that don't have native console support)