Tuned in_cksum() from Matt Thomas <matt@3am-software.com>. According
to him, this implementation is approximately 50% faster than the machine-independent portable version.
This commit is contained in:
cgd
parent
6f5bee3001
commit
260dba439d
|
|
@ -0,0 +1,184 @@
|
|||
/* $NetBSD: in_cksum.c,v 1.1 1996/05/19 21:24:14 cgd Exp $ */
|
||||
|
||||
/*
|
||||
* Copyright (c) 1988, 1992, 1993
|
||||
* The Regents of the University of California. All rights reserved.
|
||||
* Copyright (c) 1996
|
||||
* Matt Thomas <matt@3am-software.com>
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* 3. All advertising materials mentioning features or use of this software
|
||||
* must display the following acknowledgement:
|
||||
* This product includes software developed by the University of
|
||||
* California, Berkeley and its contributors.
|
||||
* 4. Neither the name of the University nor the names of its contributors
|
||||
* may be used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* @(#)in_cksum.c 8.1 (Berkeley) 6/10/93
|
||||
*/
|
||||
|
||||
#include <sys/param.h>
|
||||
#include <sys/mbuf.h>
|
||||
#include <sys/systm.h>
|
||||
#include <netinet/in.h>
|
||||
|
||||
/*
|
||||
* Checksum routine for Internet Protocol family headers
|
||||
* (Portable Alpha ersion).
|
||||
*
|
||||
* This routine is very heavily used in the network
|
||||
* code and should be modified for each CPU to be as fast as possible.
|
||||
*/
|
||||
|
||||
#define ADDCARRY(x) (x > 65535 ? x -= 65535 : x)
|
||||
#define REDUCE32 {q_util.q = sum; sum = q_util.l[0] + q_util.l[1];}
|
||||
#define REDUCE16 {q_util.q = sum; l_util.l = q_util.s[0] + q_util.s[1] + q_util.s[2] + q_util.s[3]; \
|
||||
sum = l_util.s[0] + l_util.s[1]; \
|
||||
ADDCARRY(sum);}
|
||||
|
||||
static const u_int32_t in_masks[] = {
|
||||
/* 0 bytes */ /* 1 bytes */ /* 2 bytes */ /* 3 bytes */
|
||||
0x00000000, 0x000000FF, 0x0000FFFF, 0x00FFFFFF, /* offset 0 */
|
||||
0x00000000, 0x0000FF00, 0x00FFFF00, 0xFFFFFF00, /* offset 1 */
|
||||
0x00000000, 0x00FF0000, 0xFFFF0000, 0xFFFF0000, /* offset 2 */
|
||||
0x00000000, 0xFF000000, 0xFF000000, 0xFF000000, /* offset 3 */
|
||||
};
|
||||
|
||||
union l_util {
|
||||
u_int16_t s[2];
|
||||
u_int32_t l;
|
||||
};
|
||||
union q_util {
|
||||
u_int16_t s[4];
|
||||
u_int32_t l[2];
|
||||
u_int64_t q;
|
||||
};
|
||||
|
||||
u_int64_t
|
||||
in_cksumdata(buf, len)
|
||||
register caddr_t buf;
|
||||
register int len;
|
||||
{
|
||||
const u_int32_t *lw = (u_int32_t *) buf;
|
||||
u_int64_t sum = 0;
|
||||
u_int64_t prefilled;
|
||||
int offset;
|
||||
union q_util q_util;
|
||||
union l_util l_util;
|
||||
|
||||
if ((3 & (long) lw) == 0 && len == 20) {
|
||||
sum = (u_int64_t) lw[0] + lw[1] + lw[2] + lw[3] + lw[4];
|
||||
REDUCE32;
|
||||
return sum;
|
||||
}
|
||||
|
||||
if ((offset = 3 & (long) lw) != 0) {
|
||||
const u_int32_t *masks = in_masks + (offset << 2);
|
||||
lw = (u_int32_t *) (((long) lw) - offset);
|
||||
sum = *lw++ & masks[len >= 3 ? 3 : len];
|
||||
len -= 4 - offset;
|
||||
if (len <= 0) {
|
||||
REDUCE32;
|
||||
return sum;
|
||||
}
|
||||
}
|
||||
#if 0
|
||||
/*
|
||||
* Force to cache line boundary.
|
||||
*/
|
||||
offset = 32 - (0x1f & (long) lw);
|
||||
if (offset < 32 && len > offset) {
|
||||
len -= offset;
|
||||
if (4 & offset)
|
||||
sum += (u_int64_t) lw[0], lw += 1;
|
||||
if (8 & offset)
|
||||
sum += (u_int64_t) lw[0] + lw[1], lw += 2;
|
||||
if (16 & offset)
|
||||
sum += (u_int64_t) lw[0] + lw[1] + lw[2] + lw[3], lw += 4;
|
||||
}
|
||||
#endif
|
||||
/*
|
||||
* access prefilling to start load of next cache line.
|
||||
* then add current cache line
|
||||
* save result of prefilling for loop iteration.
|
||||
*/
|
||||
prefilled = lw[0];
|
||||
while ((len -= 32) >= 4) {
|
||||
u_int64_t prefilling = lw[8];
|
||||
sum += prefilled + lw[1] + lw[2] + lw[3]
|
||||
+ lw[4] + lw[5] + lw[6] + lw[7];
|
||||
lw += 8;
|
||||
prefilled = prefilling;
|
||||
}
|
||||
if (len >= 0) {
|
||||
sum += prefilled + lw[1] + lw[2] + lw[3]
|
||||
+ lw[4] + lw[5] + lw[6] + lw[7];
|
||||
lw += 8;
|
||||
} else {
|
||||
len += 32;
|
||||
}
|
||||
while ((len -= 16) >= 0) {
|
||||
sum += (u_int64_t) lw[0] + lw[1] + lw[2] + lw[3];
|
||||
lw += 4;
|
||||
}
|
||||
len += 16;
|
||||
while ((len -= 4) >= 0) {
|
||||
sum += (u_int64_t) *lw++;
|
||||
}
|
||||
len += 4;
|
||||
if (len > 0)
|
||||
sum += (u_int64_t) (in_masks[len] & *lw);
|
||||
REDUCE32;
|
||||
return sum;
|
||||
}
|
||||
|
||||
int
|
||||
in_cksum(m, len)
|
||||
register struct mbuf *m;
|
||||
register 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;
|
||||
|
||||
for (;m && len; m = m->m_next) {
|
||||
if (m->m_len == 0)
|
||||
continue;
|
||||
mlen = m->m_len;
|
||||
if (len < mlen)
|
||||
mlen = len;
|
||||
addr = mtod(m, caddr_t);
|
||||
if ((clen ^ (long) addr) & 1)
|
||||
sum += in_cksumdata(addr, mlen) << 8;
|
||||
else
|
||||
sum += in_cksumdata(addr, mlen);
|
||||
|
||||
clen += mlen;
|
||||
len -= mlen;
|
||||
}
|
||||
REDUCE16;
|
||||
return (~sum & 0xffff);
|
||||
}
|
||||
|
|
@ -1,4 +1,4 @@
|
|||
# $NetBSD: files.alpha,v 1.18 1996/05/17 23:44:02 cgd Exp $
|
||||
# $NetBSD: files.alpha,v 1.19 1996/05/19 21:24:24 cgd Exp $
|
||||
#
|
||||
# alpha-specific configuration info
|
||||
|
||||
|
|
@ -227,14 +227,14 @@ file arch/alpha/alpha/trap.c
|
|||
file arch/alpha/alpha/vm_machdep.c
|
||||
file arch/alpha/alpha/disksubr.c
|
||||
file dev/cons.c
|
||||
file netinet/in_cksum.c
|
||||
|
||||
|
||||
#
|
||||
# Optional/miscellaneous files
|
||||
#
|
||||
|
||||
file netns/ns_cksum.c ns
|
||||
file arch/alpha/alpha/in_cksum.c inet
|
||||
file netns/ns_cksum.c ns
|
||||
|
||||
# XXX
|
||||
file arch/alpha/alpha/promcons.c
|
||||
|
|
|
|||
Loading…
Reference in New Issue