Release 4.14 arch/cris/include/asm/checksum.h
/* SPDX-License-Identifier: GPL-2.0 */
/* TODO: csum_tcpudp_magic could be speeded up, and csum_fold as well */
#ifndef _CRIS_CHECKSUM_H
#define _CRIS_CHECKSUM_H
#include <arch/checksum.h>
/*
* 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
*/
__wsum csum_partial(const void *buff, int len, __wsum sum);
/*
* the same as csum_partial, but copies from src while it
* checksums
*
* here even more important to align src and dst on a 32-bit (or even
* better 64-bit) boundary
*/
__wsum csum_partial_copy_nocheck(const void *src, void *dst,
int len, __wsum sum);
/*
* Fold a partial checksum into a word
*/
static inline __sum16 csum_fold(__wsum csum)
{
u32 sum = (__force u32)csum;
sum = (sum & 0xffff) + (sum >> 16); /* add in end-around carry */
sum = (sum & 0xffff) + (sum >> 16); /* add in end-around carry */
return (__force __sum16)~sum;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Al Viro | 28 | 49.12% | 1 | 33.33% |
Linus Torvalds | 28 | 49.12% | 1 | 33.33% |
Adrian Bunk | 1 | 1.75% | 1 | 33.33% |
Total | 57 | 100.00% | 3 | 100.00% |
extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
int len, __wsum sum,
int *errptr);
/*
* This is a version of ip_compute_csum() optimized for IP headers,
* which always checksum on 4 octet boundaries.
*
*/
static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
{
return csum_fold(csum_partial(iph, ihl * 4, 0));
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Linus Torvalds | 27 | 87.10% | 1 | 33.33% |
Al Viro | 3 | 9.68% | 1 | 33.33% |
Adrian Bunk | 1 | 3.23% | 1 | 33.33% |
Total | 31 | 100.00% | 3 | 100.00% |
/*
* 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,
__u32 len, __u8 proto,
__wsum sum)
{
return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Linus Torvalds | 32 | 82.05% | 1 | 25.00% |
Al Viro | 4 | 10.26% | 1 | 25.00% |
Alexander Duyck | 2 | 5.13% | 1 | 25.00% |
Adrian Bunk | 1 | 2.56% | 1 | 25.00% |
Total | 39 | 100.00% | 4 | 100.00% |
/*
* 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));
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Linus Torvalds | 24 | 85.71% | 1 | 33.33% |
Al Viro | 3 | 10.71% | 1 | 33.33% |
Adrian Bunk | 1 | 3.57% | 1 | 33.33% |
Total | 28 | 100.00% | 3 | 100.00% |
#endif
Overall Contributors
Person | Tokens | Prop | Commits | CommitProp |
Linus Torvalds | 173 | 74.25% | 2 | 25.00% |
Al Viro | 50 | 21.46% | 1 | 12.50% |
Adrian Bunk | 4 | 1.72% | 1 | 12.50% |
Mikael Starvik | 2 | 0.86% | 1 | 12.50% |
Alexander Duyck | 2 | 0.86% | 1 | 12.50% |
Greg Kroah-Hartman | 1 | 0.43% | 1 | 12.50% |
Jesper Nilsson | 1 | 0.43% | 1 | 12.50% |
Total | 233 | 100.00% | 8 | 100.00% |
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