Release 4.14 arch/parisc/lib/checksum.c
/*
* INET An implementation of the TCP/IP protocol suite for the LINUX
* operating system. INET is implemented using the BSD Socket
* interface as the means of communication with the user level.
*
* MIPS specific IP/TCP/UDP checksumming routines
*
* Authors: Ralf Baechle, <ralf@waldorf-gmbh.de>
* Lots of code moved from tcp.c and ip.c; see those files
* for more names.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/module.h>
#include <linux/types.h>
#include <net/checksum.h>
#include <asm/byteorder.h>
#include <asm/string.h>
#include <linux/uaccess.h>
#define addc(_t,_r) \
__asm__ __volatile__ ( \
" add %0, %1, %0\n" \
" addc %0, %%r0, %0\n" \
: "=r"(_t) \
: "r"(_r), "0"(_t));
static inline unsigned short from32to16(unsigned int x)
{
/* 32 bits --> 16 bits + carry */
x = (x & 0xffff) + (x >> 16);
/* 16 bits + carry --> 16 bits including carry */
x = (x & 0xffff) + (x >> 16);
return (unsigned short)x;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 49 | 100.00% | 1 | 100.00% |
| Total | 49 | 100.00% | 1 | 100.00% |
static inline unsigned int do_csum(const unsigned char * buff, int len)
{
int odd, count;
unsigned int result = 0;
if (len <= 0)
goto out;
odd = 1 & (unsigned long) buff;
if (odd) {
result = be16_to_cpu(*buff);
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) {
while (count >= 4) {
unsigned int r1, r2, r3, r4;
r1 = *(unsigned int *)(buff + 0);
r2 = *(unsigned int *)(buff + 4);
r3 = *(unsigned int *)(buff + 8);
r4 = *(unsigned int *)(buff + 12);
addc(result, r1);
addc(result, r2);
addc(result, r3);
addc(result, r4);
count -= 4;
buff += 16;
}
while (count) {
unsigned int w = *(unsigned int *) buff;
count--;
buff += 4;
addc(result, w);
}
result = (result & 0xffff) + (result >> 16);
}
if (len & 2) {
result += *(unsigned short *) buff;
buff += 2;
}
}
if (len & 1)
result += le16_to_cpu(*buff);
result = from32to16(result);
if (odd)
result = swab16(result);
out:
return result;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 221 | 65.19% | 1 | 50.00% |
| Matthew Wilcox | 118 | 34.81% | 1 | 50.00% |
| Total | 339 | 100.00% | 2 | 100.00% |
/*
* computes a partial checksum, e.g. for TCP/UDP fragments
*/
/*
* why bother folding?
*/
__wsum csum_partial(const void *buff, int len, __wsum sum)
{
unsigned int result = do_csum(buff, len);
addc(result, sum);
return (__force __wsum)from32to16(result);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 30 | 68.18% | 1 | 33.33% |
| Matthew Wilcox | 7 | 15.91% | 1 | 33.33% |
| Al Viro | 7 | 15.91% | 1 | 33.33% |
| Total | 44 | 100.00% | 3 | 100.00% |
EXPORT_SYMBOL(csum_partial);
/*
* copy while checksumming, otherwise like csum_partial
*/
__wsum csum_partial_copy_nocheck(const void *src, void *dst,
int len, __wsum sum)
{
/*
* It's 2:30 am and I don't feel like doing it real ...
* This is lots slower than the real thing (tm)
*/
sum = csum_partial(src, len, sum);
memcpy(dst, src, len);
return sum;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 39 | 88.64% | 1 | 33.33% |
| Al Viro | 4 | 9.09% | 1 | 33.33% |
| David S. Miller | 1 | 2.27% | 1 | 33.33% |
| Total | 44 | 100.00% | 3 | 100.00% |
EXPORT_SYMBOL(csum_partial_copy_nocheck);
/*
* 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;
missing = copy_from_user(dst, src, len);
if (missing) {
memset(dst + len - missing, 0, missing);
*err_ptr = -EFAULT;
}
return csum_partial(dst, len, sum);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 69 | 93.24% | 1 | 33.33% |
| Al Viro | 4 | 5.41% | 1 | 33.33% |
| Matthew Wilcox | 1 | 1.35% | 1 | 33.33% |
| Total | 74 | 100.00% | 3 | 100.00% |
EXPORT_SYMBOL(csum_partial_copy_from_user);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Linus Torvalds (pre-git) | 424 | 70.90% | 1 | 11.11% |
| Matthew Wilcox | 150 | 25.08% | 3 | 33.33% |
| Al Viro | 16 | 2.68% | 1 | 11.11% |
| Arnaldo Carvalho de Melo | 5 | 0.84% | 1 | 11.11% |
| Linus Torvalds | 1 | 0.17% | 1 | 11.11% |
| David S. Miller | 1 | 0.17% | 1 | 11.11% |
| Alexander Beregalov | 1 | 0.17% | 1 | 11.11% |
| Total | 598 | 100.00% | 9 | 100.00% |
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