From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/arch/mips/include/asm/checksum.h | 285 ++++++++++++++++++++++++++++++++ 1 file changed, 285 insertions(+) create mode 100644 kernel/arch/mips/include/asm/checksum.h (limited to 'kernel/arch/mips/include/asm/checksum.h') diff --git a/kernel/arch/mips/include/asm/checksum.h b/kernel/arch/mips/include/asm/checksum.h new file mode 100644 index 000000000..3ceacde5e --- /dev/null +++ b/kernel/arch/mips/include/asm/checksum.h @@ -0,0 +1,285 @@ +/* + * 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. + * + * Copyright (C) 1995, 96, 97, 98, 99, 2001 by Ralf Baechle + * Copyright (C) 1999 Silicon Graphics, Inc. + * Copyright (C) 2001 Thiemo Seufer. + * Copyright (C) 2002 Maciej W. Rozycki + * Copyright (C) 2014 Imagination Technologies Ltd. + */ +#ifndef _ASM_CHECKSUM_H +#define _ASM_CHECKSUM_H + +#ifdef CONFIG_GENERIC_CSUM +#include +#else + +#include + +#include + +/* + * 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); + +__wsum __csum_partial_copy_kernel(const void *src, void *dst, + int len, __wsum sum, int *err_ptr); + +__wsum __csum_partial_copy_from_user(const void *src, void *dst, + int len, __wsum sum, int *err_ptr); +__wsum __csum_partial_copy_to_user(const void *src, void *dst, + int len, __wsum sum, int *err_ptr); +/* + * this is a new version of the above that records errors it finds in *errp, + * but continues and zeros the rest of the buffer. + */ +static inline +__wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len, + __wsum sum, int *err_ptr) +{ + might_fault(); + if (segment_eq(get_fs(), get_ds())) + return __csum_partial_copy_kernel((__force void *)src, dst, + len, sum, err_ptr); + else + return __csum_partial_copy_from_user((__force void *)src, dst, + len, sum, err_ptr); +} + +#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER +static inline +__wsum csum_and_copy_from_user(const void __user *src, void *dst, + int len, __wsum sum, int *err_ptr) +{ + if (access_ok(VERIFY_READ, src, len)) + return csum_partial_copy_from_user(src, dst, len, sum, + err_ptr); + if (len) + *err_ptr = -EFAULT; + + return sum; +} + +/* + * Copy and checksum to user + */ +#define HAVE_CSUM_COPY_USER +static inline +__wsum csum_and_copy_to_user(const void *src, void __user *dst, int len, + __wsum sum, int *err_ptr) +{ + might_fault(); + if (access_ok(VERIFY_WRITE, dst, len)) { + if (segment_eq(get_fs(), get_ds())) + return __csum_partial_copy_kernel(src, + (__force void *)dst, + len, sum, err_ptr); + else + return __csum_partial_copy_to_user(src, + (__force void *)dst, + len, sum, err_ptr); + } + if (len) + *err_ptr = -EFAULT; + + return (__force __wsum)-1; /* invalid checksum */ +} + +/* + * the same as csum_partial, but copies from user space (but on MIPS + * we have just one address space, so this is identical to the above) + */ +__wsum csum_partial_copy_nocheck(const void *src, void *dst, + int len, __wsum sum); +#define csum_partial_copy_nocheck csum_partial_copy_nocheck + +/* + * Fold a partial checksum without adding pseudo headers + */ +static inline __sum16 csum_fold(__wsum csum) +{ + u32 sum = (__force u32)csum;; + + sum += (sum << 16); + csum = (sum < csum); + sum >>= 16; + sum += csum; + + return (__force __sum16)~sum; +} +#define csum_fold csum_fold + +/* + * This is a version of ip_compute_csum() optimized for IP headers, + * which always checksum on 4 octet boundaries. + * + * By Jorge Cwik , adapted for linux by + * Arnt Gulbrandsen. + */ +static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) +{ + const unsigned int *word = iph; + const unsigned int *stop = word + ihl; + unsigned int csum; + int carry; + + csum = word[0]; + csum += word[1]; + carry = (csum < word[1]); + csum += carry; + + csum += word[2]; + carry = (csum < word[2]); + csum += carry; + + csum += word[3]; + carry = (csum < word[3]); + csum += carry; + + word += 4; + do { + csum += *word; + carry = (csum < *word); + csum += carry; + word++; + } while (word != stop); + + return csum_fold(csum); +} +#define ip_fast_csum ip_fast_csum + +static inline __wsum csum_tcpudp_nofold(__be32 saddr, + __be32 daddr, unsigned short len, unsigned short proto, + __wsum sum) +{ + __asm__( + " .set push # csum_tcpudp_nofold\n" + " .set noat \n" +#ifdef CONFIG_32BIT + " addu %0, %2 \n" + " sltu $1, %0, %2 \n" + " addu %0, $1 \n" + + " addu %0, %3 \n" + " sltu $1, %0, %3 \n" + " addu %0, $1 \n" + + " addu %0, %4 \n" + " sltu $1, %0, %4 \n" + " addu %0, $1 \n" +#endif +#ifdef CONFIG_64BIT + " daddu %0, %2 \n" + " daddu %0, %3 \n" + " daddu %0, %4 \n" + " dsll32 $1, %0, 0 \n" + " daddu %0, $1 \n" + " dsra32 %0, %0, 0 \n" +#endif + " .set pop" + : "=r" (sum) + : "0" ((__force unsigned long)daddr), + "r" ((__force unsigned long)saddr), +#ifdef __MIPSEL__ + "r" ((proto + len) << 8), +#else + "r" (proto + len), +#endif + "r" ((__force unsigned long)sum)); + + return sum; +} +#define csum_tcpudp_nofold csum_tcpudp_nofold + +/* + * 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)); +} + +#define _HAVE_ARCH_IPV6_CSUM +static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr, + const struct in6_addr *daddr, + __u32 len, unsigned short proto, + __wsum sum) +{ + __wsum tmp; + + __asm__( + " .set push # csum_ipv6_magic\n" + " .set noreorder \n" + " .set noat \n" + " addu %0, %5 # proto (long in network byte order)\n" + " sltu $1, %0, %5 \n" + " addu %0, $1 \n" + + " addu %0, %6 # csum\n" + " sltu $1, %0, %6 \n" + " lw %1, 0(%2) # four words source address\n" + " addu %0, $1 \n" + " addu %0, %1 \n" + " sltu $1, %0, %1 \n" + + " lw %1, 4(%2) \n" + " addu %0, $1 \n" + " addu %0, %1 \n" + " sltu $1, %0, %1 \n" + + " lw %1, 8(%2) \n" + " addu %0, $1 \n" + " addu %0, %1 \n" + " sltu $1, %0, %1 \n" + + " lw %1, 12(%2) \n" + " addu %0, $1 \n" + " addu %0, %1 \n" + " sltu $1, %0, %1 \n" + + " lw %1, 0(%3) \n" + " addu %0, $1 \n" + " addu %0, %1 \n" + " sltu $1, %0, %1 \n" + + " lw %1, 4(%3) \n" + " addu %0, $1 \n" + " addu %0, %1 \n" + " sltu $1, %0, %1 \n" + + " lw %1, 8(%3) \n" + " addu %0, $1 \n" + " addu %0, %1 \n" + " sltu $1, %0, %1 \n" + + " lw %1, 12(%3) \n" + " addu %0, $1 \n" + " addu %0, %1 \n" + " sltu $1, %0, %1 \n" + + " addu %0, $1 # Add final carry\n" + " .set pop" + : "=&r" (sum), "=&r" (tmp) + : "r" (saddr), "r" (daddr), + "0" (htonl(len)), "r" (htonl(proto)), "r" (sum)); + + return csum_fold(sum); +} + +#include +#endif /* CONFIG_GENERIC_CSUM */ + +#endif /* _ASM_CHECKSUM_H */ -- cgit 1.2.3-korg