From: Eric Biggers <ebiggers@xxxxxxxxxx>
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: Ard Biesheuvel <ardb@xxxxxxxxxx>
Reviewed-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
---
include/linux/crc-t10dif.h | 12 ++++++++++++
lib/Kconfig | 32 ++++++++++++++++++++++++++++++++
2 files changed, 44 insertions(+)
diff --git a/include/linux/crc-t10dif.h b/include/linux/crc-t10dif.h
index 206ba2305483..16787c1cee21 100644
--- a/include/linux/crc-t10dif.h
+++ b/include/linux/crc-t10dif.h
@@ -5,18 +5,30 @@
#include <linux/types.h>
#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);
}
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
diff --git a/lib/Kconfig b/lib/Kconfig
index be59f7cdf448..e52a38d8d783 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -159,10 +159,42 @@ config CRC_T10DIF
help
This option is only needed if a module that's not in the
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
select CRYPTO
select CRYPTO_CRC64_ROCKSOFT
--
2.47.1
