Differential D2199 Diff 4721 sys/arm64/arm64/in_cksum.c

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sys/arm64/arm64/in_cksum.c

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				/* $NetBSD: in_cksum.c,v 1.7 1997/09/02 13:18:15 thorpej Exp $ */

				emasteUnsubmitted Not Done Inline Actions This one's on the list for de-duplication emaste: This one's on the list for de-duplication
				/*-
				* 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/cdefs.h> /* RCS ID & Copyright macro defns */
				__FBSDID("$FreeBSD$");

				#include <sys/param.h>
				#include <sys/mbuf.h>
				#include <sys/systm.h>
				#include <netinet/in_systm.h>
				#include <netinet/in.h>
				#include <netinet/ip.h>
				#include <machine/in_cksum.h>

				/*
				* Checksum routine for Internet Protocol family headers
				* (Portable Alpha version).
				*
				* 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.s[0] + q_util.s[1] + q_util.s[2] + q_util.s[3]; \
				}
				#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 byte/ /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;
				};

				static u_int64_t
				in_cksumdata(const void *buf, int len)
				{
				const u_int32_t lw = (const u_int32_t ) buf;
				u_int64_t sum = 0;
				u_int64_t prefilled;
				int offset;
				union q_util q_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;
				}

				u_short
				in_addword(u_short a, u_short b)
				{
				u_int64_t sum = a + b;

				ADDCARRY(sum);
				return (sum);
				}

				u_short
				in_pseudo(u_int32_t a, u_int32_t b, u_int32_t c)
				{
				u_int64_t sum;
				union q_util q_util;
				union l_util l_util;

				sum = (u_int64_t) a + b + c;
				REDUCE16;
				return (sum);
				}

				u_short
				in_cksum_skip(struct mbuf *m, int len, int skip)
				{
				u_int64_t sum = 0;
				int mlen = 0;
				int clen = 0;
				caddr_t addr;
				union q_util q_util;
				union l_util l_util;

				len -= skip;
				for (; skip && m; m = m->m_next) {
				if (m->m_len > skip) {
				mlen = m->m_len - skip;
				addr = mtod(m, caddr_t) + skip;
				goto skip_start;
				} else {
				skip -= m->m_len;
				}
				}

				for (; m && len; m = m->m_next) {
				if (m->m_len == 0)
				continue;
				mlen = m->m_len;
				addr = mtod(m, caddr_t);
				skip_start:
				if (len < mlen)
				mlen = len;
				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);
				}

				u_int in_cksum_hdr(const struct ip *ip)
				{
				u_int64_t sum = in_cksumdata(ip, sizeof(struct ip));
				union q_util q_util;
				union l_util l_util;
				REDUCE16;
				return (~sum & 0xffff);
				}