ca15c8ecd5
TBD: do_csum still needs to be written in asm Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
101 lines
2.5 KiB
C
101 lines
2.5 KiB
C
/*
|
|
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* Joern Rennecke <joern.rennecke@embecosm.com>: Jan 2012
|
|
* -Insn Scheduling improvements to csum core routines.
|
|
* = csum_fold( ) largely derived from ARM version.
|
|
* = ip_fast_cum( ) to have module scheduling
|
|
* -gcc 4.4.x broke networking. Alias analysis needed to be primed.
|
|
* worked around by adding memory clobber to ip_fast_csum( )
|
|
*
|
|
* vineetg: May 2010
|
|
* -Rewrote ip_fast_cscum( ) and csum_fold( ) with fast inline asm
|
|
*/
|
|
|
|
#ifndef _ASM_ARC_CHECKSUM_H
|
|
#define _ASM_ARC_CHECKSUM_H
|
|
|
|
/*
|
|
* Fold a partial checksum
|
|
*
|
|
* The 2 swords comprising the 32bit sum are added, any carry to 16th bit
|
|
* added back and final sword result inverted.
|
|
*/
|
|
static inline __sum16 csum_fold(__wsum s)
|
|
{
|
|
unsigned r = s << 16 | s >> 16; /* ror */
|
|
s = ~s;
|
|
s -= r;
|
|
return s >> 16;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
const void *ptr = iph;
|
|
unsigned int tmp, tmp2, sum;
|
|
|
|
__asm__(
|
|
" ld.ab %0, [%3, 4] \n"
|
|
" ld.ab %2, [%3, 4] \n"
|
|
" sub %1, %4, 2 \n"
|
|
" lsr.f lp_count, %1, 1 \n"
|
|
" bcc 0f \n"
|
|
" add.f %0, %0, %2 \n"
|
|
" ld.ab %2, [%3, 4] \n"
|
|
"0: lp 1f \n"
|
|
" ld.ab %1, [%3, 4] \n"
|
|
" adc.f %0, %0, %2 \n"
|
|
" ld.ab %2, [%3, 4] \n"
|
|
" adc.f %0, %0, %1 \n"
|
|
"1: adc.f %0, %0, %2 \n"
|
|
" add.cs %0,%0,1 \n"
|
|
: "=&r"(sum), "=r"(tmp), "=&r"(tmp2), "+&r" (ptr)
|
|
: "r"(ihl)
|
|
: "cc", "lp_count", "memory");
|
|
|
|
return csum_fold(sum);
|
|
}
|
|
|
|
/*
|
|
* TCP pseudo Header is 12 bytes:
|
|
* SA [4], DA [4], zeroes [1], Proto[1], TCP Seg(hdr+data) Len [2]
|
|
*/
|
|
static inline __wsum
|
|
csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
|
|
unsigned short proto, __wsum sum)
|
|
{
|
|
__asm__ __volatile__(
|
|
" add.f %0, %0, %1 \n"
|
|
" adc.f %0, %0, %2 \n"
|
|
" adc.f %0, %0, %3 \n"
|
|
" adc.f %0, %0, %4 \n"
|
|
" adc %0, %0, 0 \n"
|
|
: "+&r"(sum)
|
|
: "r"(saddr), "r"(daddr),
|
|
#ifdef CONFIG_CPU_BIG_ENDIAN
|
|
"r"(len),
|
|
#else
|
|
"r"(len << 8),
|
|
#endif
|
|
"r"(htons(proto))
|
|
: "cc");
|
|
|
|
return sum;
|
|
}
|
|
|
|
#define csum_fold csum_fold
|
|
#define ip_fast_csum ip_fast_csum
|
|
#define csum_tcpudp_nofold csum_tcpudp_nofold
|
|
|
|
#include <asm-generic/checksum.h>
|
|
|
|
#endif /* _ASM_ARC_CHECKSUM_H */
|