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Kbuild
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airq.h
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alternative-asm.h
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linkage.h
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livepatch.h
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lowcore.h
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mmu.h
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mmu_context.h
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pci.h
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pci_dma.h
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perf_event.h
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uaccess.h
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Editing: checksum.h
Close
/* SPDX-License-Identifier: GPL-2.0 */ /* * S390 fast network checksum routines * * S390 version * Copyright IBM Corp. 1999 * Author(s): Ulrich Hild (first version) * Martin Schwidefsky (heavily optimized CKSM version) * D.J. Barrow (third attempt) */ #ifndef _S390_CHECKSUM_H #define _S390_CHECKSUM_H #include <linux/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. */ static inline __wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len, __wsum sum, int *err_ptr) { if (unlikely(copy_from_user(dst, src, len))) *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) { u32 csum = (__force u32) sum; csum += (csum >> 16) + (csum << 16); csum >>= 16; return (__force __sum16) ~csum; } /* * 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, __u32 len, __u8 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, __u32 len, __u8 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 */