crc64.h

 1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * CRC64 using [V]PCLMULQDQ instructions
 4 *
 5 * Copyright 2025 Google LLC
 6 */
 7
 8#include "crc-pclmul-template.h"
 9
10static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_pclmulqdq);
11
12DECLARE_CRC_PCLMUL_FUNCS(crc64_msb, u64);
13DECLARE_CRC_PCLMUL_FUNCS(crc64_lsb, u64);
14
15static inline u64 crc64_be_arch(u64 crc, const u8 *p, size_t len)
16{
17	CRC_PCLMUL(crc, p, len, crc64_msb, crc64_msb_0x42f0e1eba9ea3693_consts,
18		   have_pclmulqdq);
19	return crc64_be_generic(crc, p, len);
20}
21
22static inline u64 crc64_nvme_arch(u64 crc, const u8 *p, size_t len)
23{
24	CRC_PCLMUL(crc, p, len, crc64_lsb, crc64_lsb_0x9a6c9329ac4bc9b5_consts,
25		   have_pclmulqdq);
26	return crc64_nvme_generic(crc, p, len);
27}
28
29#define crc64_mod_init_arch crc64_mod_init_arch
30static void crc64_mod_init_arch(void)
31{
32	if (boot_cpu_has(X86_FEATURE_PCLMULQDQ)) {
33		static_branch_enable(&have_pclmulqdq);
34		if (have_vpclmul()) {
35			if (have_avx512()) {
36				static_call_update(crc64_msb_pclmul,
37						   crc64_msb_vpclmul_avx512);
38				static_call_update(crc64_lsb_pclmul,
39						   crc64_lsb_vpclmul_avx512);
40			} else {
41				static_call_update(crc64_msb_pclmul,
42						   crc64_msb_vpclmul_avx2);
43				static_call_update(crc64_lsb_pclmul,
44						   crc64_lsb_vpclmul_avx2);
45			}
46		}
47	}
48}