microblaze_v8: checksum support
Reviewed-by: Ingo Molnar <mingo@elte.hu> Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com> Acked-by: John Linn <john.linn@xilinx.com> Acked-by: John Williams <john.williams@petalogix.com> Signed-off-by: Michal Simek <monstr@monstr.eu>
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Michal Simek
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/*
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* Copyright (C) 2008 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2006 Atmark Techno, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef _ASM_MICROBLAZE_CHECKSUM_H
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#define _ASM_MICROBLAZE_CHECKSUM_H
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#include <linux/in6.h>
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/*
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* computes the checksum of the TCP/UDP pseudo-header
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* returns a 16-bit checksum, already complemented
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*/
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static inline __wsum
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csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
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unsigned short proto, __wsum sum)
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{
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__asm__("add %0, %0, %1\n\t"
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"addc %0, %0, %2\n\t"
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"addc %0, %0, %3\n\t"
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"addc %0, %0, r0\n\t"
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: "+&d" (sum)
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: "d" (saddr), "d" (daddr), "d" (len + proto));
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return sum;
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}
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/*
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* computes the checksum of a memory block at buff, length len,
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* and adds in "sum" (32-bit)
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*
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* returns a 32-bit number suitable for feeding into itself
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* or csum_tcpudp_magic
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*
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* this function must be called with even lengths, except
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* for the last fragment, which may be odd
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*
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* it's best to have buff aligned on a 32-bit boundary
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*/
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extern __wsum csum_partial(const void *buff, int len, __wsum sum);
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/*
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* the same as csum_partial, but copies from src while it
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* checksums
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*
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* here even more important to align src and dst on a 32-bit (or even
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* better 64-bit) boundary
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*/
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extern __wsum csum_partial_copy(const char *src, char *dst, int len, int sum);
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/*
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* the same as csum_partial_copy, but copies from user space.
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*
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* here even more important to align src and dst on a 32-bit (or even
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* better 64-bit) boundary
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*/
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extern __wsum csum_partial_copy_from_user(const char *src, char *dst,
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int len, int sum, int *csum_err);
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#define csum_partial_copy_nocheck(src, dst, len, sum) \
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csum_partial_copy((src), (dst), (len), (sum))
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/*
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* This is a version of ip_compute_csum() optimized for IP headers,
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* which always checksum on 4 octet boundaries.
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*
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*/
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extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
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/*
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* Fold a partial checksum
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*/
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static inline __sum16 csum_fold(unsigned int sum)
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{
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sum = (sum & 0xffff) + (sum >> 16);
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sum = (sum & 0xffff) + (sum >> 16);
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return ~sum;
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}
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static inline __sum16
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csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len,
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unsigned short proto, __wsum sum)
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{
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return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
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}
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/*
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* this routine is used for miscellaneous IP-like checksums, mainly
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* in icmp.c
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*/
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extern __sum16 ip_compute_csum(const unsigned char *buff, int len);
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#endif /* _ASM_MICROBLAZE_CHECKSUM_H */
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@ -0,0 +1,163 @@
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/*
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*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* IP/TCP/UDP checksumming routines
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*
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* Authors: Jorge Cwik, <jorge@laser.satlink.net>
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* Arnt Gulbrandsen, <agulbra@nvg.unit.no>
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* Tom May, <ftom@netcom.com>
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* Andreas Schwab, <schwab@issan.informatik.uni-dortmund.de>
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* Lots of code moved from tcp.c and ip.c; see those files
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* for more names.
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*
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* 03/02/96 Jes Sorensen, Andreas Schwab, Roman Hodek:
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* Fixed some nasty bugs, causing some horrible crashes.
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* A: At some points, the sum (%0) was used as
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* length-counter instead of the length counter
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* (%1). Thanks to Roman Hodek for pointing this out.
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* B: GCC seems to mess up if one uses too many
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* data-registers to hold input values and one tries to
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* specify d0 and d1 as scratch registers. Letting gcc
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* choose these registers itself solves the problem.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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/* Revised by Kenneth Albanowski for m68knommu. Basic problem: unaligned access
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kills, so most of the assembly has to go. */
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#include <net/checksum.h>
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#include <asm/checksum.h>
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#include <linux/module.h>
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static inline unsigned short from32to16(unsigned long x)
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{
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/* add up 16-bit and 16-bit for 16+c bit */
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x = (x & 0xffff) + (x >> 16);
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/* add up carry.. */
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x = (x & 0xffff) + (x >> 16);
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return x;
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}
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static unsigned int do_csum(const unsigned char *buff, int len)
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{
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int odd, count;
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unsigned long result = 0;
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if (len <= 0)
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goto out;
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odd = 1 & (unsigned long) buff;
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if (odd) {
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result = *buff;
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len--;
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buff++;
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}
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count = len >> 1; /* nr of 16-bit words.. */
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if (count) {
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if (2 & (unsigned long) buff) {
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result += *(unsigned short *) buff;
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count--;
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len -= 2;
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buff += 2;
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}
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count >>= 1; /* nr of 32-bit words.. */
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if (count) {
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unsigned long carry = 0;
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do {
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unsigned long w = *(unsigned long *) buff;
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count--;
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buff += 4;
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result += carry;
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result += w;
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carry = (w > result);
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} while (count);
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result += carry;
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result = (result & 0xffff) + (result >> 16);
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}
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if (len & 2) {
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result += *(unsigned short *) buff;
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buff += 2;
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}
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}
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if (len & 1)
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result += (*buff << 8);
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result = from32to16(result);
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if (odd)
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result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
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out:
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return result;
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}
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/*
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* This is a version of ip_compute_csum() optimized for IP headers,
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* which always checksum on 4 octet boundaries.
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*/
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__sum16 ip_fast_csum(const void *iph, unsigned int ihl)
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{
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return (__force __sum16)~do_csum(iph, ihl*4);
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}
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/*
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* computes the checksum of a memory block at buff, length len,
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* and adds in "sum" (32-bit)
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*
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* returns a 32-bit number suitable for feeding into itself
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* or csum_tcpudp_magic
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*
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* this function must be called with even lengths, except
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* for the last fragment, which may be odd
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*
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* it's best to have buff aligned on a 32-bit boundary
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*/
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__wsum csum_partial(const void *buff, int len, __wsum sum)
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{
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unsigned int result = do_csum(buff, len);
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/* add in old sum, and carry.. */
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result += sum;
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if (sum > result)
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result += 1;
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return result;
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}
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EXPORT_SYMBOL(csum_partial);
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/*
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* this routine is used for miscellaneous IP-like checksums, mainly
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* in icmp.c
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*/
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__sum16 ip_compute_csum(const unsigned char *buff, int len)
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{
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return ~do_csum(buff, len);
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}
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EXPORT_SYMBOL(ip_compute_csum);
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/*
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* copy from fs while checksumming, otherwise like csum_partial
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*/
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__wsum
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csum_partial_copy_from_user(const char __user *src, char *dst, int len,
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int sum, int *csum_err)
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{
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if (csum_err)
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*csum_err = 0;
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memcpy(dst, src, len);
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return csum_partial(dst, len, sum);
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}
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EXPORT_SYMBOL(csum_partial_copy_from_user);
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/*
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* copy from ds while checksumming, otherwise like csum_partial
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*/
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__wsum
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csum_partial_copy(const char *src, char *dst, int len, int sum)
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{
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memcpy(dst, src, len);
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return csum_partial(dst, len, sum);
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}
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EXPORT_SYMBOL(csum_partial_copy);
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