mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-22 18:32:14 +07:00
b1bdb691c3
Fixes for various arch compilation problems:
(*) Missing module exports.
(*) Variable name collision when rxkad and af_rxrpc both built in
(rxrpc_debug).
(*) Large constant representation problem (AFS_UUID_TO_UNIX_TIME).
(*) Configuration dependencies.
(*) printk() format warnings.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
141 lines
3.0 KiB
C
141 lines
3.0 KiB
C
/*
|
|
* Network Checksum & Copy routine
|
|
*
|
|
* Copyright (C) 1999, 2003-2004 Hewlett-Packard Co
|
|
* Stephane Eranian <eranian@hpl.hp.com>
|
|
*
|
|
* Most of the code has been imported from Linux/Alpha
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/string.h>
|
|
|
|
#include <asm/uaccess.h>
|
|
|
|
/*
|
|
* XXX Fixme: those 2 inlines are meant for debugging and will go away
|
|
*/
|
|
static inline unsigned
|
|
short from64to16(unsigned 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 long do_csum_c(const unsigned char * buff, int len, unsigned int psum)
|
|
{
|
|
int odd, count;
|
|
unsigned long result = (unsigned long)psum;
|
|
|
|
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) {
|
|
if (4 & (unsigned long) buff) {
|
|
result += *(unsigned int *) buff;
|
|
count--;
|
|
len -= 4;
|
|
buff += 4;
|
|
}
|
|
count >>= 1; /* nr of 64-bit words.. */
|
|
if (count) {
|
|
unsigned long carry = 0;
|
|
do {
|
|
unsigned long w = *(unsigned long *) buff;
|
|
count--;
|
|
buff += 8;
|
|
result += carry;
|
|
result += w;
|
|
carry = (w > result);
|
|
} while (count);
|
|
result += carry;
|
|
result = (result & 0xffffffff) + (result >> 32);
|
|
}
|
|
if (len & 4) {
|
|
result += *(unsigned int *) buff;
|
|
buff += 4;
|
|
}
|
|
}
|
|
if (len & 2) {
|
|
result += *(unsigned short *) buff;
|
|
buff += 2;
|
|
}
|
|
}
|
|
if (len & 1)
|
|
result += *buff;
|
|
|
|
result = from64to16(result);
|
|
|
|
if (odd)
|
|
result = ((result >> 8) & 0xff) | ((result & 0xff) << 8);
|
|
|
|
out:
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* XXX Fixme
|
|
*
|
|
* This is very ugly but temporary. THIS NEEDS SERIOUS ENHANCEMENTS.
|
|
* But it's very tricky to get right even in C.
|
|
*/
|
|
extern unsigned long do_csum(const unsigned char *, long);
|
|
|
|
__wsum
|
|
csum_partial_copy_from_user(const void __user *src, void *dst,
|
|
int len, __wsum psum, int *errp)
|
|
{
|
|
unsigned long result;
|
|
|
|
/* XXX Fixme
|
|
* for now we separate the copy from checksum for obvious
|
|
* alignment difficulties. Look at the Alpha code and you'll be
|
|
* scared.
|
|
*/
|
|
|
|
if (__copy_from_user(dst, src, len) != 0 && errp)
|
|
*errp = -EFAULT;
|
|
|
|
result = do_csum(dst, len);
|
|
|
|
/* add in old sum, and carry.. */
|
|
result += (__force u32)psum;
|
|
/* 32+c bits -> 32 bits */
|
|
result = (result & 0xffffffff) + (result >> 32);
|
|
return (__force __wsum)result;
|
|
}
|
|
|
|
EXPORT_SYMBOL(csum_partial_copy_from_user);
|
|
|
|
__wsum
|
|
csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum)
|
|
{
|
|
return csum_partial_copy_from_user((__force const void __user *)src,
|
|
dst, len, sum, NULL);
|
|
}
|
|
|
|
EXPORT_SYMBOL(csum_partial_copy_nocheck);
|