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Diffstat (limited to 'include/asm-s390/checksum.h')
| -rw-r--r-- | include/asm-s390/checksum.h | 166 |
1 files changed, 0 insertions, 166 deletions
diff --git a/include/asm-s390/checksum.h b/include/asm-s390/checksum.h deleted file mode 100644 index d5a8e7c1477..00000000000 --- a/include/asm-s390/checksum.h +++ /dev/null @@ -1,166 +0,0 @@ -#ifndef _S390_CHECKSUM_H -#define _S390_CHECKSUM_H - -/* - * include/asm-s390/checksum.h - * S390 fast network checksum routines - * see also arch/S390/lib/checksum.c - * - * S390 version - * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation - * Author(s): Ulrich Hild (first version) - * Martin Schwidefsky (heavily optimized CKSM version) - * D.J. Barrow (third attempt) - */ - -#include <asm/uaccess.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 - */ -static inline __wsum -csum_partial(const void *buff, int len, __wsum sum) -{ - register unsigned long reg2 asm("2") = (unsigned long) buff; - register unsigned long reg3 asm("3") = (unsigned long) len; - - asm volatile( - "0: cksm %0,%1\n" /* do checksum on longs */ - " jo 0b\n" - : "+d" (sum), "+d" (reg2), "+d" (reg3) : : "cc", "memory"); - return sum; -} - -/* - * the same as csum_partial_copy, but copies from user space. - * - * here even more important to align src and dst on a 32-bit (or even - * better 64-bit) boundary - * - * Copy from userspace and compute checksum. If we catch an exception - * then zero 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) -{ - 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); -} - - -static inline __wsum -csum_partial_copy_nocheck (const void *src, void *dst, int len, __wsum sum) -{ - memcpy(dst,src,len); - return csum_partial(dst, len, sum); -} - -/* - * Fold a partial checksum without adding pseudo headers - */ -static inline __sum16 csum_fold(__wsum sum) -{ -#ifndef __s390x__ - register_pair rp; - - asm volatile( - " slr %N1,%N1\n" /* %0 = H L */ - " lr %1,%0\n" /* %0 = H L, %1 = H L 0 0 */ - " srdl %1,16\n" /* %0 = H L, %1 = 0 H L 0 */ - " alr %1,%N1\n" /* %0 = H L, %1 = L H L 0 */ - " alr %0,%1\n" /* %0 = H+L+C L+H */ - " srl %0,16\n" /* %0 = H+L+C */ - : "+&d" (sum), "=d" (rp) : : "cc"); -#else /* __s390x__ */ - asm volatile( - " sr 3,3\n" /* %0 = H*65536 + L */ - " lr 2,%0\n" /* %0 = H L, 2/3 = H L / 0 0 */ - " srdl 2,16\n" /* %0 = H L, 2/3 = 0 H / L 0 */ - " alr 2,3\n" /* %0 = H L, 2/3 = L H / L 0 */ - " alr %0,2\n" /* %0 = H+L+C L+H */ - " srl %0,16\n" /* %0 = H+L+C */ - : "+&d" (sum) : : "cc", "2", "3"); -#endif /* __s390x__ */ - return (__force __sum16) ~sum; -} - -/* - * 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)); -} - -/* - * computes the checksum of the TCP/UDP pseudo-header - * returns a 32-bit checksum - */ -static inline __wsum -csum_tcpudp_nofold(__be32 saddr, __be32 daddr, - unsigned short len, unsigned short proto, - __wsum sum) -{ - __u32 csum = (__force __u32)sum; - - csum += (__force __u32)saddr; - if (csum < (__force __u32)saddr) - csum++; - - csum += (__force __u32)daddr; - if (csum < (__force __u32)daddr) - csum++; - - csum += len + proto; - if (csum < len + proto) - csum++; - - return (__force __wsum)csum; -} - -/* - * 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, - unsigned short len, unsigned short proto, - __wsum sum) -{ - return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); -} - -/* - * 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)); -} - -#endif /* _S390_CHECKSUM_H */ - - |