Commit 0961c3bc authored by Eric Biggers's avatar Eric Biggers
Browse files

lib/crc-t10dif: add support for arch overrides 



Following what was done for CRC32, add support for architecture-specific
override of the CRC-T10DIF library.  This will allow the CRC-T10DIF
library functions to access architecture-optimized code directly.

Reviewed-by: default avatarArd Biesheuvel <ardb@kernel.org>
Reviewed-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20241202012056.209768-3-ebiggers@kernel.org


Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
parent be3c45b0

include/linux/crc-t10dif.h

+12 −0
Original line number Diff line number Diff line
@@ -7,10 +7,13 @@ 
#define CRC_T10DIF_DIGEST_SIZE 2

#define CRC_T10DIF_BLOCK_SIZE 1



u16 crc_t10dif_arch(u16 crc, const u8 *p, size_t len);

u16 crc_t10dif_generic(u16 crc, const u8 *p, size_t len);



static inline u16 crc_t10dif_update(u16 crc, const u8 *p, size_t len)

{

	if (IS_ENABLED(CONFIG_CRC_T10DIF_ARCH))

		return crc_t10dif_arch(crc, p, len);

	return crc_t10dif_generic(crc, p, len);

}
@@ -19,4 +22,13 @@ static inline u16 crc_t10dif(const u8 *p, size_t len) 
	return crc_t10dif_update(0, p, len);

}



#if IS_ENABLED(CONFIG_CRC_T10DIF_ARCH)

bool crc_t10dif_is_optimized(void);

#else

static inline bool crc_t10dif_is_optimized(void)

{

	return false;

}

#endif



#endif

lib/Kconfig

+32 −0
Original line number Diff line number Diff line
@@ -161,6 +161,38 @@ config CRC_T10DIF 
	  kernel tree needs to calculate CRC checks for use with the

	  SCSI data integrity subsystem.



config ARCH_HAS_CRC_T10DIF

	bool



choice

	prompt "CRC-T10DIF implementation"

	depends on CRC_T10DIF

	default CRC_T10DIF_IMPL_ARCH if ARCH_HAS_CRC_T10DIF

	default CRC_T10DIF_IMPL_GENERIC if !ARCH_HAS_CRC_T10DIF

	help

	  This option allows you to override the default choice of CRC-T10DIF

	  implementation.



config CRC_T10DIF_IMPL_ARCH

	bool "Architecture-optimized" if ARCH_HAS_CRC_T10DIF

	help

	  Use the optimized implementation of CRC-T10DIF for the selected

	  architecture.  It is recommended to keep this enabled, as it can

	  greatly improve CRC-T10DIF performance.



config CRC_T10DIF_IMPL_GENERIC

	bool "Generic implementation"

	help

	  Use the generic table-based implementation of CRC-T10DIF.  Selecting

	  this will reduce code size slightly but can greatly reduce CRC-T10DIF

	  performance.



endchoice



config CRC_T10DIF_ARCH

	tristate

	default CRC_T10DIF if CRC_T10DIF_IMPL_ARCH



config CRC64_ROCKSOFT

	tristate "CRC calculation for the Rocksoft model CRC64"

	select CRC64