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ed4bc981d5
Move the x86 CRC-T10DIF assembly code into the lib directory and wire it up to the library interface. This allows it to be used without going through the crypto API. It remains usable via the crypto API too via the shash algorithms that use the library interface. Thus all the arch-specific "shash" code becomes unnecessary and is removed. Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Link: https://lore.kernel.org/r/20241202012056.209768-5-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@google.com>
51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* CRC-T10DIF using PCLMULQDQ instructions
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*
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* Copyright 2024 Google LLC
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*/
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#include <asm/cpufeatures.h>
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#include <asm/simd.h>
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#include <crypto/internal/simd.h>
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#include <linux/crc-t10dif.h>
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#include <linux/module.h>
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static DEFINE_STATIC_KEY_FALSE(have_pclmulqdq);
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asmlinkage u16 crc_t10dif_pcl(u16 init_crc, const u8 *buf, size_t len);
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u16 crc_t10dif_arch(u16 crc, const u8 *p, size_t len)
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{
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if (len >= 16 &&
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static_key_enabled(&have_pclmulqdq) && crypto_simd_usable()) {
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kernel_fpu_begin();
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crc = crc_t10dif_pcl(crc, p, len);
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kernel_fpu_end();
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return crc;
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}
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return crc_t10dif_generic(crc, p, len);
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}
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EXPORT_SYMBOL(crc_t10dif_arch);
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static int __init crc_t10dif_x86_init(void)
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{
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if (boot_cpu_has(X86_FEATURE_PCLMULQDQ))
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static_branch_enable(&have_pclmulqdq);
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return 0;
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}
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arch_initcall(crc_t10dif_x86_init);
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static void __exit crc_t10dif_x86_exit(void)
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{
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}
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module_exit(crc_t10dif_x86_exit);
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bool crc_t10dif_is_optimized(void)
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{
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return static_key_enabled(&have_pclmulqdq);
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}
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EXPORT_SYMBOL(crc_t10dif_is_optimized);
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MODULE_DESCRIPTION("CRC-T10DIF using PCLMULQDQ instructions");
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MODULE_LICENSE("GPL");
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