92 lines
2.0 KiB
C
92 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/export.h>
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#include <asm/checksum.h>
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#include <asm/fpu.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). If copy is true copies to dst.
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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 src and dst aligned on a 64-bit boundary.
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*/
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static __always_inline __wsum csum_copy(void *dst, const void *src, int len, __wsum sum, bool copy)
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{
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DECLARE_KERNEL_FPU_ONSTACK8(vxstate);
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if (!cpu_has_vx()) {
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if (copy)
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memcpy(dst, src, len);
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return cksm(dst, len, sum);
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}
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kernel_fpu_begin(&vxstate, KERNEL_VXR_V16V23);
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fpu_vlvgf(16, (__force u32)sum, 1);
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fpu_vzero(17);
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fpu_vzero(18);
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fpu_vzero(19);
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while (len >= 64) {
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fpu_vlm(20, 23, src);
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if (copy) {
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fpu_vstm(20, 23, dst);
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dst += 64;
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}
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fpu_vcksm(16, 20, 16);
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fpu_vcksm(17, 21, 17);
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fpu_vcksm(18, 22, 18);
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fpu_vcksm(19, 23, 19);
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src += 64;
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len -= 64;
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}
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while (len >= 32) {
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fpu_vlm(20, 21, src);
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if (copy) {
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fpu_vstm(20, 21, dst);
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dst += 32;
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}
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fpu_vcksm(16, 20, 16);
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fpu_vcksm(17, 21, 17);
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src += 32;
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len -= 32;
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}
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while (len >= 16) {
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fpu_vl(20, src);
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if (copy) {
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fpu_vst(20, dst);
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dst += 16;
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}
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fpu_vcksm(16, 20, 16);
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src += 16;
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len -= 16;
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}
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if (len) {
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fpu_vll(20, len - 1, src);
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if (copy)
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fpu_vstl(20, len - 1, dst);
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fpu_vcksm(16, 20, 16);
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}
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fpu_vcksm(18, 19, 18);
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fpu_vcksm(16, 17, 16);
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fpu_vcksm(16, 18, 16);
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sum = (__force __wsum)fpu_vlgvf(16, 1);
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kernel_fpu_end(&vxstate, KERNEL_VXR_V16V23);
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return sum;
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}
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__wsum csum_partial(const void *buff, int len, __wsum sum)
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{
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return csum_copy(NULL, buff, len, sum, false);
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}
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EXPORT_SYMBOL(csum_partial);
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__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len)
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{
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return csum_copy(dst, src, len, 0, true);
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}
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EXPORT_SYMBOL(csum_partial_copy_nocheck);
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