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214 lines
5.6 KiB
214 lines
5.6 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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#ifndef _ASM_POWERPC_CHECKSUM_H |
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#define _ASM_POWERPC_CHECKSUM_H |
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#ifdef __KERNEL__ |
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/* |
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*/ |
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#include <linux/bitops.h> |
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#include <linux/in6.h> |
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/* |
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* Computes the checksum of a memory block at src, length len, |
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* and adds in "sum" (32-bit), while copying the block to dst. |
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* If an access exception occurs on src or dst, it stores -EFAULT |
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* to *src_err or *dst_err respectively (if that pointer is not |
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* NULL), and, for an error on src, zeroes the rest of dst. |
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* |
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* Like csum_partial, this must be called with even lengths, |
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* except for the last fragment. |
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*/ |
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extern __wsum csum_partial_copy_generic(const void *src, void *dst, int len); |
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#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER |
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extern __wsum csum_and_copy_from_user(const void __user *src, void *dst, |
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int len); |
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#define HAVE_CSUM_COPY_USER |
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extern __wsum csum_and_copy_to_user(const void *src, void __user *dst, |
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int len); |
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#define _HAVE_ARCH_CSUM_AND_COPY |
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#define csum_partial_copy_nocheck(src, dst, len) \ |
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csum_partial_copy_generic((src), (dst), (len)) |
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/* |
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* turns a 32-bit partial checksum (e.g. from csum_partial) into a |
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* 1's complement 16-bit checksum. |
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*/ |
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static inline __sum16 csum_fold(__wsum sum) |
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{ |
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unsigned int tmp; |
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/* swap the two 16-bit halves of sum */ |
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__asm__("rlwinm %0,%1,16,0,31" : "=r" (tmp) : "r" (sum)); |
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/* if there is a carry from adding the two 16-bit halves, |
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it will carry from the lower half into the upper half, |
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giving us the correct sum in the upper half. */ |
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return (__force __sum16)(~((__force u32)sum + tmp) >> 16); |
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} |
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static inline u32 from64to32(u64 x) |
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{ |
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return (x + ror64(x, 32)) >> 32; |
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} |
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static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len, |
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__u8 proto, __wsum sum) |
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{ |
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#ifdef __powerpc64__ |
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u64 s = (__force u32)sum; |
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s += (__force u32)saddr; |
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s += (__force u32)daddr; |
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#ifdef __BIG_ENDIAN__ |
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s += proto + len; |
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#else |
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s += (proto + len) << 8; |
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#endif |
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return (__force __wsum) from64to32(s); |
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#else |
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__asm__("\n\ |
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addc %0,%0,%1 \n\ |
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adde %0,%0,%2 \n\ |
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adde %0,%0,%3 \n\ |
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addze %0,%0 \n\ |
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" |
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: "=r" (sum) |
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: "r" (daddr), "r"(saddr), "r"(proto + len), "0"(sum)); |
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return sum; |
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#endif |
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} |
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/* |
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* computes the checksum of the TCP/UDP pseudo-header |
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* returns a 16-bit checksum, already complemented |
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*/ |
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static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, __u32 len, |
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__u8 proto, __wsum sum) |
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{ |
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return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum)); |
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} |
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#define HAVE_ARCH_CSUM_ADD |
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static __always_inline __wsum csum_add(__wsum csum, __wsum addend) |
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{ |
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#ifdef __powerpc64__ |
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u64 res = (__force u64)csum; |
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#endif |
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if (__builtin_constant_p(csum) && csum == 0) |
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return addend; |
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if (__builtin_constant_p(addend) && addend == 0) |
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return csum; |
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#ifdef __powerpc64__ |
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res += (__force u64)addend; |
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return (__force __wsum)((u32)res + (res >> 32)); |
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#else |
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asm("addc %0,%0,%1;" |
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"addze %0,%0;" |
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: "+r" (csum) : "r" (addend) : "xer"); |
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return csum; |
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#endif |
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} |
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/* |
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* This is a version of ip_compute_csum() optimized for IP headers, |
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* which always checksum on 4 octet boundaries. ihl is the number |
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* of 32-bit words and is always >= 5. |
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*/ |
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static inline __wsum ip_fast_csum_nofold(const void *iph, unsigned int ihl) |
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{ |
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const u32 *ptr = (const u32 *)iph + 1; |
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#ifdef __powerpc64__ |
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unsigned int i; |
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u64 s = *(const u32 *)iph; |
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for (i = 0; i < ihl - 1; i++, ptr++) |
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s += *ptr; |
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return (__force __wsum)from64to32(s); |
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#else |
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__wsum sum, tmp; |
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asm("mtctr %3;" |
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"addc %0,%4,%5;" |
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"1: lwzu %1, 4(%2);" |
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"adde %0,%0,%1;" |
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"bdnz 1b;" |
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"addze %0,%0;" |
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: "=r" (sum), "=r" (tmp), "+b" (ptr) |
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: "r" (ihl - 2), "r" (*(const u32 *)iph), "r" (*ptr) |
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: "ctr", "xer", "memory"); |
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return sum; |
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#endif |
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} |
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static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) |
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{ |
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return csum_fold(ip_fast_csum_nofold(iph, ihl)); |
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} |
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/* |
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* computes the checksum of a memory block at buff, length len, |
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* and adds in "sum" (32-bit) |
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* |
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* returns a 32-bit number suitable for feeding into itself |
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* or csum_tcpudp_magic |
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* |
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* this function must be called with even lengths, except |
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* for the last fragment, which may be odd |
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* |
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* it's best to have buff aligned on a 32-bit boundary |
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*/ |
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__wsum __csum_partial(const void *buff, int len, __wsum sum); |
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static __always_inline __wsum csum_partial(const void *buff, int len, __wsum sum) |
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{ |
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if (__builtin_constant_p(len) && len <= 16 && (len & 1) == 0) { |
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if (len == 2) |
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sum = csum_add(sum, (__force __wsum)*(const u16 *)buff); |
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if (len >= 4) |
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sum = csum_add(sum, (__force __wsum)*(const u32 *)buff); |
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if (len == 6) |
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sum = csum_add(sum, (__force __wsum) |
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*(const u16 *)(buff + 4)); |
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if (len >= 8) |
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sum = csum_add(sum, (__force __wsum) |
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*(const u32 *)(buff + 4)); |
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if (len == 10) |
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sum = csum_add(sum, (__force __wsum) |
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*(const u16 *)(buff + 8)); |
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if (len >= 12) |
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sum = csum_add(sum, (__force __wsum) |
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*(const u32 *)(buff + 8)); |
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if (len == 14) |
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sum = csum_add(sum, (__force __wsum) |
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*(const u16 *)(buff + 12)); |
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if (len >= 16) |
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sum = csum_add(sum, (__force __wsum) |
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*(const u32 *)(buff + 12)); |
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} else if (__builtin_constant_p(len) && (len & 3) == 0) { |
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sum = csum_add(sum, ip_fast_csum_nofold(buff, len >> 2)); |
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} else { |
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sum = __csum_partial(buff, len, sum); |
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} |
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return sum; |
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} |
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/* |
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* this routine is used for miscellaneous IP-like checksums, mainly |
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* in icmp.c |
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*/ |
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static inline __sum16 ip_compute_csum(const void *buff, int len) |
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{ |
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return csum_fold(csum_partial(buff, len, 0)); |
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} |
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#define _HAVE_ARCH_IPV6_CSUM |
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__sum16 csum_ipv6_magic(const struct in6_addr *saddr, |
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const struct in6_addr *daddr, |
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__u32 len, __u8 proto, __wsum sum); |
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#endif /* __KERNEL__ */ |
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#endif
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