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![Christophe Leroy](/assets/img/avatar_default.png)
rol32(x, 16) will do the rotate using rlwinm. No need to open code using inline assembly. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/794337eff7bb803d2c4e67d9eee635390c4c48fe.1646812553.git.christophe.leroy@csgroup.eu
221 lines
5.7 KiB
C
221 lines
5.7 KiB
C
/* 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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u32 tmp = (__force u32)sum;
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/*
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* swap the two 16-bit halves of 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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*/
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return (__force __sum16)(~(tmp + rol32(tmp, 16)) >> 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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res += (__force u64)addend;
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return (__force __wsum)((u32)res + (res >> 32));
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#else
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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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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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#define HAVE_ARCH_CSUM_SHIFT
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static __always_inline __wsum csum_shift(__wsum sum, int offset)
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{
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/* rotate sum to align it with a 16b boundary */
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return (__force __wsum)rol32((__force u32)sum, (offset & 1) << 3);
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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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