Kconfig

  1# SPDX-License-Identifier: GPL-2.0-only
  2
  3# Kconfig for the kernel's cyclic redundancy check (CRC) library code
  4
  5config CRC4
  6	tristate
  7	help
  8	  The CRC4 library functions.  Select this if your module uses any of
  9	  the functions from <linux/crc4.h>.
 10
 11config CRC7
 12	tristate
 13	help
 14	  The CRC7 library functions.  Select this if your module uses any of
 15	  the functions from <linux/crc7.h>.
 16
 17config CRC8
 18	tristate
 19	help
 20	  The CRC8 library functions.  Select this if your module uses any of
 21	  the functions from <linux/crc8.h>.
 22
 23config CRC16
 24	tristate
 25	help
 26	  The CRC16 library functions.  Select this if your module uses any of
 27	  the functions from <linux/crc16.h>.
 28
 29config CRC_CCITT
 30	tristate
 31	help
 32	  The CRC-CCITT library functions.  Select this if your module uses any
 33	  of the functions from <linux/crc-ccitt.h>.
 34
 35config CRC_ITU_T
 36	tristate
 37	help
 38	  The CRC-ITU-T library functions.  Select this if your module uses
 39	  any of the functions from <linux/crc-itu-t.h>.
 40
 41config CRC_T10DIF
 42	tristate
 43	help
 44	  The CRC-T10DIF library functions.  Select this if your module uses
 45	  any of the functions from <linux/crc-t10dif.h>.
 46
 47config CRC_T10DIF_ARCH
 48	bool
 49	depends on CRC_T10DIF && CRC_OPTIMIZATIONS
 50	default y if ARM && KERNEL_MODE_NEON
 51	default y if ARM64 && KERNEL_MODE_NEON
 52	default y if PPC64 && ALTIVEC
 53	default y if RISCV && RISCV_ISA_ZBC
 54	default y if X86
 55
 56config CRC32
 57	tristate
 58	select BITREVERSE
 59	help
 60	  The CRC32 library functions.  Select this if your module uses any of
 61	  the functions from <linux/crc32.h> or <linux/crc32c.h>.
 62
 63config CRC32_ARCH
 64	bool
 65	depends on CRC32 && CRC_OPTIMIZATIONS
 66	default y if ARM && KERNEL_MODE_NEON
 67	default y if ARM64
 68	default y if LOONGARCH
 69	default y if MIPS && CPU_MIPSR6
 70	default y if PPC64 && ALTIVEC
 71	default y if RISCV && RISCV_ISA_ZBC
 72	default y if S390
 73	default y if SPARC64
 74	default y if X86
 75
 76config CRC64
 77	tristate
 78	help
 79	  The CRC64 library functions.  Select this if your module uses any of
 80	  the functions from <linux/crc64.h>.
 81
 82config CRC64_ARCH
 83	bool
 84	depends on CRC64 && CRC_OPTIMIZATIONS
 85	default y if RISCV && RISCV_ISA_ZBC && 64BIT
 86	default y if X86_64
 87
 88config CRC_OPTIMIZATIONS
 89	bool "Enable optimized CRC implementations" if EXPERT
 90	depends on !UML
 91	default y
 92	help
 93	  Disabling this option reduces code size slightly by disabling the
 94	  architecture-optimized implementations of any CRC variants that are
 95	  enabled.  CRC checksumming performance may get much slower.
 96
 97	  Keep this enabled unless you're really trying to minimize the size of
 98	  the kernel.
 99
100config CRC_KUNIT_TEST
101	tristate "KUnit tests for CRC functions" if !KUNIT_ALL_TESTS
102	depends on KUNIT
103	default KUNIT_ALL_TESTS
104	select CRC7
105	select CRC16
106	select CRC_T10DIF
107	select CRC32
108	select CRC64
109	help
110	  Unit tests for the CRC library functions.
111
112	  This is intended to help people writing architecture-specific
113	  optimized versions.  If unsure, say N.
114
115config CRC_BENCHMARK
116	bool "Benchmark for the CRC functions"
117	depends on CRC_KUNIT_TEST
118	help
119	  Include benchmarks in the KUnit test suite for the CRC functions.