sh: Convert sh64 to use the generic checksum code.

This plugs in GENERIC_CSUM support on sh64, and kills off all of the old
references.
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/Kconfig

@@ -50,6 +50,10 @@ config GENERIC_BUG
 	def_bool y
 	depends on BUG && SUPERH32
 
+config GENERIC_CSUM
+	def_bool y
+	depends on SUPERH64
+
 config GENERIC_FIND_NEXT_BIT
 	def_bool y
 

arch/sh/include/asm/checksum.h

 #ifdef CONFIG_SUPERH32
 # include "checksum_32.h"
 #else
-# include "checksum_64.h"
+# include <asm-generic/checksum.h>
 #endif

arch/sh/include/asm/checksum_64.h

-#ifndef __ASM_SH_CHECKSUM_64_H
-#define __ASM_SH_CHECKSUM_64_H
-
-/*
- * include/asm-sh/checksum_64.h
- *
- * Copyright (C) 2000, 2001  Paolo Alberelli
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- */
-
-/*
- * computes the checksum of a memory block at buff, length len,
- * and adds in "sum" (32-bit)
- *
- * returns a 32-bit number suitable for feeding into itself
- * or csum_tcpudp_magic
- *
- * this function must be called with even lengths, except
- * for the last fragment, which may be odd
- *
- * it's best to have buff aligned on a 32-bit boundary
- */
-asmlinkage __wsum csum_partial(const void *buff, int len, __wsum sum);
-
-/*
- *	Note: when you get a NULL pointer exception here this means someone
- *	passed in an incorrect kernel address to one of these functions.
- *
- *	If you use these functions directly please don't forget the
- *	access_ok().
- */
-
-
-__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len,
-				       __wsum sum);
-
-__wsum csum_partial_copy_from_user(const void __user *src, void *dst,
-					 int len, __wsum sum, int *err_ptr);
-
-static inline __sum16 csum_fold(__wsum csum)
-{
-	u32 sum = (__force u32)csum;
-        sum = (sum & 0xffff) + (sum >> 16);
-        sum = (sum & 0xffff) + (sum >> 16);
-        return (__force __sum16)~sum;
-}
-
-__sum16 ip_fast_csum(const void *iph, unsigned int ihl);
-
-__wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
-				 unsigned short len, unsigned short proto,
-				 __wsum sum);
-
-/*
- * computes the checksum of the TCP/UDP pseudo-header
- * returns a 16-bit checksum, already complemented
- */
-static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
-						   unsigned short len,
-						   unsigned short proto,
-						   __wsum sum)
-{
-	return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
-}
-
-/*
- * this routine is used for miscellaneous IP-like checksums, mainly
- * in icmp.c
- */
-static inline __sum16 ip_compute_csum(const void *buff, int len)
-{
-	return csum_fold(csum_partial(buff, len, 0));
-}
-
-#endif /* __ASM_SH_CHECKSUM_64_H */

arch/sh/kernel/sh_ksyms_64.c

@@ -38,13 +38,6 @@ EXPORT_SYMBOL(clear_user_page);
 EXPORT_SYMBOL(flush_dcache_page);
 #endif
 
-/* Networking helper routines. */
-EXPORT_SYMBOL(csum_partial);
-EXPORT_SYMBOL(csum_partial_copy_nocheck);
-#ifdef CONFIG_IPV6
-EXPORT_SYMBOL(csum_ipv6_magic);
-#endif
-
 #ifdef CONFIG_VT
 EXPORT_SYMBOL(screen_info);
 #endif

arch/sh/lib64/Makefile

@@ -10,7 +10,7 @@
 #
 
 # Panic should really be compiled as PIC
-lib-y  := udelay.o c-checksum.o dbg.o panic.o memcpy.o memset.o \
+lib-y  := udelay.o dbg.o panic.o memcpy.o memset.o \
 	  copy_user_memcpy.o copy_page.o clear_page.o strcpy.o strlen.o
 
 # Extracted from libgcc

arch/sh/lib64/c-checksum.c

-/*
- * arch/sh/lib64/c-checksum.c
- *
- * This file contains network checksum routines that are better done
- * in an architecture-specific manner due to speed..
- */
-#include <linux/string.h>
-#include <linux/errno.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <asm/byteorder.h>
-#include <asm/uaccess.h>
-
-static inline unsigned short from64to16(unsigned long long x)
-{
-	/* add up 32-bit words for 33 bits */
-	x = (x & 0xffffffff) + (x >> 32);
-	/* add up 16-bit and 17-bit words for 17+c bits */
-	x = (x & 0xffff) + (x >> 16);
-	/* add up 16-bit and 2-bit for 16+c bit */
-	x = (x & 0xffff) + (x >> 16);
-	/* add up carry.. */
-	x = (x & 0xffff) + (x >> 16);
-	return x;
-}
-
-static inline unsigned short foldto16(unsigned long x)
-{
-	/* add up 16-bit for 17 bits */
-	x = (x & 0xffff) + (x >> 16);
-	/* add up carry.. */
-	x = (x & 0xffff) + (x >> 16);
-	return x;
-}
-
-static inline unsigned short myfoldto16(unsigned long long x)
-{
-	/* Fold down to 32-bits so we don't lose in the typedef-less
-	   network stack.  */
-	/* 64 to 33 */
-	x = (x & 0xffffffff) + (x >> 32);
-	/* 33 to 32 */
-	x = (x & 0xffffffff) + (x >> 32);
-
-	/* add up 16-bit for 17 bits */
-	x = (x & 0xffff) + (x >> 16);
-	/* add up carry.. */
-	x = (x & 0xffff) + (x >> 16);
-	return x;
-}
-
-#define odd(x) ((x)&1)
-#define U16(x) ntohs(x)
-
-static unsigned long do_csum(const unsigned char *buff, int len)
-{
-	int odd, count;
-	unsigned long result = 0;
-
-	pr_debug("do_csum buff %p, len %d (0x%x)\n", buff, len, len);
-#ifdef DEBUG
-	for (i = 0; i < len; i++) {
-		if ((i % 26) == 0)
-			printk("\n");
-		printk("%02X ", buff[i]);
-	}
-#endif
-
-	if (len <= 0)
-		goto out;
-
-	odd = 1 & (unsigned long) buff;
-	if (odd) {
-		result = *buff << 8;
-		len--;
-		buff++;
-	}
-	count = len >> 1;	/* nr of 16-bit words.. */
-	if (count) {
-		if (2 & (unsigned long) buff) {
-			result += *(unsigned short *) buff;
-			count--;
-			len -= 2;
-			buff += 2;
-		}
-		count >>= 1;	/* nr of 32-bit words.. */
-		if (count) {
-			unsigned long carry = 0;
-			do {
-				unsigned long w = *(unsigned long *) buff;
-				buff += 4;
-				count--;
-				result += carry;
-				result += w;
-				carry = (w > result);
-			} while (count);
-			result += carry;
-			result = (result & 0xffff) + (result >> 16);
-		}
-		if (len & 2) {
-			result += *(unsigned short *) buff;
-			buff += 2;
-		}
-	}
-	if (len & 1)
-		result += *buff;
-	result = foldto16(result);
-	if (odd)
-		result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
-
-	pr_debug("\nCHECKSUM is 0x%lx\n", result);
-
-      out:
-	return result;
-}
-
-/* computes the checksum of a memory block at buff, length len,
-   and adds in "sum" (32-bit)  */
-__wsum csum_partial(const void *buff, int len, __wsum sum)
-{
-	unsigned long long result = do_csum(buff, len);
-
-	/* add in old sum, and carry.. */
-	result += (__force u32)sum;
-	/* 32+c bits -> 32 bits */
-	result = (result & 0xffffffff) + (result >> 32);
-
-	pr_debug("csum_partial, buff %p len %d sum 0x%x result=0x%016Lx\n",
-		buff, len, sum, result);
-
-	return (__force __wsum)result;
-}
-
-/* Copy while checksumming, otherwise like csum_partial.  */
-__wsum
-csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum)
-{
-	sum = csum_partial(src, len, sum);
-	memcpy(dst, src, len);
-
-	return sum;
-}
-
-/* Copy from userspace and compute checksum.  If we catch an exception
-   then zero the rest of the buffer.  */
-__wsum
-csum_partial_copy_from_user(const void __user *src, void *dst, int len,
-			    __wsum sum, int *err_ptr)
-{
-	int missing;
-
-	pr_debug
-	    ("csum_partial_copy_from_user src %p, dest %p, len %d, sum %08x, err_ptr %p\n",
-	     src, dst, len, sum, err_ptr);
-	missing = copy_from_user(dst, src, len);
-	pr_debug("  access_ok %d\n", __access_ok((unsigned long) src, len));
-	pr_debug("  missing %d\n", missing);
-	if (missing) {
-		memset(dst + len - missing, 0, missing);
-		*err_ptr = -EFAULT;
-	}
-
-	return csum_partial(dst, len, sum);
-}
-
-/* Copy to userspace and compute checksum.  */
-__wsum
-csum_partial_copy_to_user(const unsigned char *src, unsigned char *dst, int len,
-			  __wsum sum, int *err_ptr)
-{
-	sum = csum_partial(src, len, sum);
-
-	if (copy_to_user(dst, src, len))
-		*err_ptr = -EFAULT;
-
-	return sum;
-}
-
-/*
- *	This is a version of ip_compute_csum() optimized for IP headers,
- *	which always checksum on 4 octet boundaries.
- */
-__sum16 ip_fast_csum(const void *iph, unsigned int ihl)
-{
-	pr_debug("ip_fast_csum %p,%d\n", iph, ihl);
-
-	return (__force __sum16)~do_csum(iph, ihl * 4);
-}
-
-__wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
-				unsigned short len,
-				unsigned short proto, __wsum sum)
-{
-	unsigned long long result;
-
-	pr_debug("ntohs(0x%x)=0x%x\n", 0xdead, ntohs(0xdead));
-	pr_debug("htons(0x%x)=0x%x\n", 0xdead, htons(0xdead));
-
-	result = (__force u64) saddr + (__force u64) daddr +
-		 (__force u64) sum + ((len + proto) << 8);
-
-	/* Fold down to 32-bits so we don't lose in the typedef-less
-	   network stack.  */
-	/* 64 to 33 */
-	result = (result & 0xffffffff) + (result >> 32);
-	/* 33 to 32 */
-	result = (result & 0xffffffff) + (result >> 32);
-
-	pr_debug("%s saddr %x daddr %x len %x proto %x sum %x result %08Lx\n",
-		__func__, saddr, daddr, len, proto, sum, result);
-
-	return (__wsum)result;
-}
-EXPORT_SYMBOL(csum_tcpudp_nofold);