[RFC,v2] hash: unify crc32 API header for x86 and ARM

From: Pavan Nikhilesh <pbhagavatula@marvell.com>

Merge crc32 hash calculation public API headers for x86 and ARM.
Select the best available CRC32 algorithm when unsupported algorithm
on a given CPU architecture is requested by an application.

Previously, if an application directly includes `rte_crc_arm64.h` without
including `rte_hash_crc.h` it will fail to compile.
Although, `rte_crc_arm64.h` is no longer needed make it a dummy file for
ABI purposes.

Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
---
 v2 Changes:
 - Don't remove `rte_crc_arm64.h` for ABI purposes.
 - Revert function pointer approach for performance reasons.
 - Select the best available algorithm based on the arch when user passes an
 unsupported crc32 algorithm.

 app/test/test_hash.c            |   6 ++
 lib/librte_hash/meson.build     |   6 +-
 lib/librte_hash/rte_crc_arm64.h | 175 +-------------------------------
 lib/librte_hash/rte_hash_crc.h  | 153 ++++++++++++++++++++--------
 4 files changed, 122 insertions(+), 218 deletions(-)

--
2.17.1

> -----Original Message-----
> From: pbhagavatula@marvell.com <pbhagavatula@marvell.com>
> Sent: Wednesday, May 13, 2020 4:40 AM
> To: jerinj@marvell.com; konstantin.ananyev@intel.com;
> harry.van.haaren@intel.com; Yipeng Wang <yipeng1.wang@intel.com>;
> Sameh Gobriel <sameh.gobriel@intel.com>; Bruce Richardson
> <bruce.richardson@intel.com>; Ruifeng Wang <Ruifeng.Wang@arm.com>
> Cc: dev@dpdk.org; Pavan Nikhilesh <pbhagavatula@marvell.com>
> Subject: [dpdk-dev] [RFC v2] hash: unify crc32 API header for x86 and ARM
> 
> From: Pavan Nikhilesh <pbhagavatula@marvell.com>
> 
> Merge crc32 hash calculation public API headers for x86 and ARM.
> Select the best available CRC32 algorithm when unsupported algorithm on a
> given CPU architecture is requested by an application.
> 
> Previously, if an application directly includes `rte_crc_arm64.h` without
> including `rte_hash_crc.h` it will fail to compile.
> Although, `rte_crc_arm64.h` is no longer needed make it a dummy file for
> ABI purposes.
> 
> Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
> ---
>  v2 Changes:
>  - Don't remove `rte_crc_arm64.h` for ABI purposes.
>  - Revert function pointer approach for performance reasons.
>  - Select the best available algorithm based on the arch when user passes an
> unsupported crc32 algorithm.
> 
Maybe split the patch? Changes to select the best available algorithm can be a separate one.

More ifdefs are added. Is it possible to have arch specific rte_hash_crc_xx implementations
like what was done in rte_crc_arm64.h, and include specific headers according to arch in rte_hash.crc.h?
For ABI purpose, rte_crc_arm64.h can be kept and it only includes the new arm64 specific header.

>  app/test/test_hash.c            |   6 ++
>  lib/librte_hash/meson.build     |   6 +-
>  lib/librte_hash/rte_crc_arm64.h | 175 +-------------------------------
> lib/librte_hash/rte_hash_crc.h  | 153 ++++++++++++++++++++--------
>  4 files changed, 122 insertions(+), 218 deletions(-)
> 
> diff --git a/app/test/test_hash.c b/app/test/test_hash.c index
> afa3a1a3c..7bd457dac 100644
> --- a/app/test/test_hash.c
> +++ b/app/test/test_hash.c
> @@ -195,7 +195,13 @@ test_crc32_hash_alg_equiv(void)
>  	}
> 
>  	/* Resetting to best available algorithm */
> +#if defined RTE_ARCH_X86
>  	rte_hash_crc_set_alg(CRC32_SSE42_x64);
> +#elif defined RTE_ARCH_ARM64
> +	rte_hash_crc_set_alg(CRC32_ARM64);
> +#else
> +	rte_hash_crc_set_alg(CRC32_SW);
> +#endif
> 
>  	if (i == CRC32_ITERATIONS)
>  		return 0;
> diff --git a/lib/librte_hash/meson.build b/lib/librte_hash/meson.build index
> 6ab46ae9d..8a3cf2f64 100644
> --- a/lib/librte_hash/meson.build
> +++ b/lib/librte_hash/meson.build
> @@ -1,12 +1,14 @@
>  # SPDX-License-Identifier: BSD-3-Clause  # Copyright(c) 2017 Intel
> Corporation
> 
> -headers = files('rte_crc_arm64.h',
> -	'rte_fbk_hash.h',
> +headers = files('rte_fbk_hash.h',
>  	'rte_hash_crc.h',
>  	'rte_hash.h',
>  	'rte_jhash.h',
>  	'rte_thash.h')
> +if dpdk_conf.has('RTE_ARCH_ARM64')
> +	headers += files('rte_crc_arm64.h')
> +endif
> 
>  sources = files('rte_cuckoo_hash.c', 'rte_fbk_hash.c')  deps += ['ring'] diff --
> git a/lib/librte_hash/rte_crc_arm64.h b/lib/librte_hash/rte_crc_arm64.h
> index b4628cfc0..adfcafc7d 100644
> --- a/lib/librte_hash/rte_crc_arm64.h
> +++ b/lib/librte_hash/rte_crc_arm64.h
> @@ -5,179 +5,6 @@
>  #ifndef _RTE_CRC_ARM64_H_
>  #define _RTE_CRC_ARM64_H_
> 
> -/**
> - * @file
> - *
> - * RTE CRC arm64 Hash
> - */
> -
> -#ifdef __cplusplus
> -extern "C" {
> -#endif
> -
> -#include <stdint.h>
> -#include <rte_cpuflags.h>
> -#include <rte_branch_prediction.h>
> -#include <rte_common.h>
> -
> -static inline uint32_t
> -crc32c_arm64_u8(uint8_t data, uint32_t init_val) -{
> -	__asm__ volatile(
> -			"crc32cb %w[crc], %w[crc], %w[value]"
> -			: [crc] "+r" (init_val)
> -			: [value] "r" (data));
> -	return init_val;
> -}
> -
> -static inline uint32_t
> -crc32c_arm64_u16(uint16_t data, uint32_t init_val) -{
> -	__asm__ volatile(
> -			"crc32ch %w[crc], %w[crc], %w[value]"
> -			: [crc] "+r" (init_val)
> -			: [value] "r" (data));
> -	return init_val;
> -}
> -
> -static inline uint32_t
> -crc32c_arm64_u32(uint32_t data, uint32_t init_val) -{
> -	__asm__ volatile(
> -			"crc32cw %w[crc], %w[crc], %w[value]"
> -			: [crc] "+r" (init_val)
> -			: [value] "r" (data));
> -	return init_val;
> -}
> -
> -static inline uint32_t
> -crc32c_arm64_u64(uint64_t data, uint32_t init_val) -{
> -	__asm__ volatile(
> -			"crc32cx %w[crc], %w[crc], %x[value]"
> -			: [crc] "+r" (init_val)
> -			: [value] "r" (data));
> -	return init_val;
> -}
> -
> -/**
> - * Allow or disallow use of arm64 SIMD instrinsics for CRC32 hash
> - * calculation.
> - *
> - * @param alg
> - *   An OR of following flags:
> - *   - (CRC32_SW) Don't use arm64 crc intrinsics
> - *   - (CRC32_ARM64) Use ARMv8 CRC intrinsic if available
> - *
> - */
> -static inline void
> -rte_hash_crc_set_alg(uint8_t alg)
> -{
> -	switch (alg) {
> -	case CRC32_ARM64:
> -		if (!rte_cpu_get_flag_enabled(RTE_CPUFLAG_CRC32))
> -			alg = CRC32_SW;
> -		/* fall-through */
> -	case CRC32_SW:
> -		crc32_alg = alg;
> -		/* fall-through */
> -	default:
> -		break;
> -	}
> -}
> -
> -/* Setting the best available algorithm */
> -RTE_INIT(rte_hash_crc_init_alg)
> -{
> -	rte_hash_crc_set_alg(CRC32_ARM64);
> -}
> -
> -/**
> - * Use single crc32 instruction to perform a hash on a 1 byte value.
> - * Fall back to software crc32 implementation in case arm64 crc intrinsics is
> - * not supported
> - *
> - * @param data
> - *   Data to perform hash on.
> - * @param init_val
> - *   Value to initialise hash generator.
> - * @return
> - *   32bit calculated hash value.
> - */
> -static inline uint32_t
> -rte_hash_crc_1byte(uint8_t data, uint32_t init_val) -{
> -	if (likely(crc32_alg & CRC32_ARM64))
> -		return crc32c_arm64_u8(data, init_val);
> -
> -	return crc32c_1byte(data, init_val);
> -}
> -
> -/**
> - * Use single crc32 instruction to perform a hash on a 2 bytes value.
> - * Fall back to software crc32 implementation in case arm64 crc intrinsics is
> - * not supported
> - *
> - * @param data
> - *   Data to perform hash on.
> - * @param init_val
> - *   Value to initialise hash generator.
> - * @return
> - *   32bit calculated hash value.
> - */
> -static inline uint32_t
> -rte_hash_crc_2byte(uint16_t data, uint32_t init_val) -{
> -	if (likely(crc32_alg & CRC32_ARM64))
> -		return crc32c_arm64_u16(data, init_val);
> -
> -	return crc32c_2bytes(data, init_val);
> -}
> -
> -/**
> - * Use single crc32 instruction to perform a hash on a 4 byte value.
> - * Fall back to software crc32 implementation in case arm64 crc intrinsics is
> - * not supported
> - *
> - * @param data
> - *   Data to perform hash on.
> - * @param init_val
> - *   Value to initialise hash generator.
> - * @return
> - *   32bit calculated hash value.
> - */
> -static inline uint32_t
> -rte_hash_crc_4byte(uint32_t data, uint32_t init_val) -{
> -	if (likely(crc32_alg & CRC32_ARM64))
> -		return crc32c_arm64_u32(data, init_val);
> -
> -	return crc32c_1word(data, init_val);
> -}
> -
> -/**
> - * Use single crc32 instruction to perform a hash on a 8 byte value.
> - * Fall back to software crc32 implementation in case arm64 crc intrinsics is
> - * not supported
> - *
> - * @param data
> - *   Data to perform hash on.
> - * @param init_val
> - *   Value to initialise hash generator.
> - * @return
> - *   32bit calculated hash value.
> - */
> -static inline uint32_t
> -rte_hash_crc_8byte(uint64_t data, uint32_t init_val) -{
> -	if (likely(crc32_alg == CRC32_ARM64))
> -		return crc32c_arm64_u64(data, init_val);
> -
> -	return crc32c_2words(data, init_val);
> -}
> -
> -#ifdef __cplusplus
> -}
> -#endif
> +#include "rte_hash_crc.h"
> 
>  #endif /* _RTE_CRC_ARM64_H_ */
> diff --git a/lib/librte_hash/rte_hash_crc.h b/lib/librte_hash/rte_hash_crc.h
> index cf28031b3..eaba70c12 100644
> --- a/lib/librte_hash/rte_hash_crc.h
> +++ b/lib/librte_hash/rte_hash_crc.h
> @@ -16,10 +16,12 @@ extern "C" {
>  #endif
> 
>  #include <stdint.h>
> -#include <rte_config.h>
> -#include <rte_cpuflags.h>
> +
>  #include <rte_branch_prediction.h>
>  #include <rte_common.h>
> +#include <rte_config.h>
> +#include <rte_cpuflags.h>
> +#include <rte_log.h>
> 
>  /* Lookup tables for software implementation of CRC32C */  static const
> uint32_t crc32c_tables[8][256] = {{ @@ -322,7 +324,7 @@
> crc32c_2bytes(uint16_t data, uint32_t init_val)  }
> 
>  static inline uint32_t
> -crc32c_1word(uint32_t data, uint32_t init_val)
> +crc32c_4bytes(uint32_t data, uint32_t init_val)
>  {
>  	uint32_t crc, term1, term2;
>  	crc = init_val;
> @@ -336,7 +338,7 @@ crc32c_1word(uint32_t data, uint32_t init_val)  }
> 
>  static inline uint32_t
> -crc32c_2words(uint64_t data, uint32_t init_val)
> +crc32c_8bytes(uint64_t data, uint32_t init_val)
>  {
>  	uint32_t crc, term1, term2;
>  	union {
> @@ -358,6 +360,48 @@ crc32c_2words(uint64_t data, uint32_t init_val)
>  	return crc;
>  }
> 
> +#if defined(RTE_ARCH_ARM64) &&
> defined(RTE_MACHINE_CPUFLAG_CRC32)
> +static inline uint32_t
> +crc32c_arm64_u8(uint8_t data, uint32_t init_val) {
> +	__asm__ volatile(
> +			"crc32cb %w[crc], %w[crc], %w[value]"
> +			: [crc] "+r" (init_val)
> +			: [value] "r" (data));
> +	return init_val;
> +}
> +
> +static inline uint32_t
> +crc32c_arm64_u16(uint16_t data, uint32_t init_val) {
> +	__asm__ volatile(
> +			"crc32ch %w[crc], %w[crc], %w[value]"
> +			: [crc] "+r" (init_val)
> +			: [value] "r" (data));
> +	return init_val;
> +}
> +
> +static inline uint32_t
> +crc32c_arm64_u32(uint32_t data, uint32_t init_val) {
> +	__asm__ volatile(
> +			"crc32cw %w[crc], %w[crc], %w[value]"
> +			: [crc] "+r" (init_val)
> +			: [value] "r" (data));
> +	return init_val;
> +}
> +
> +static inline uint32_t
> +crc32c_arm64_u64(uint64_t data, uint32_t init_val) {
> +	__asm__ volatile(
> +			"crc32cx %w[crc], %w[crc], %x[value]"
> +			: [crc] "+r" (init_val)
> +			: [value] "r" (data));
> +	return init_val;
> +}
> +#endif
> +
>  #if defined(RTE_ARCH_X86)
>  static inline uint32_t
>  crc32c_sse42_u8(uint8_t data, uint32_t init_val) @@ -424,42 +468,69 @@
> crc32c_sse42_u64(uint64_t data, uint64_t init_val)
> 
>  static uint8_t crc32_alg = CRC32_SW;
> 
> -#if defined(RTE_ARCH_ARM64) &&
> defined(RTE_MACHINE_CPUFLAG_CRC32)
> -#include "rte_crc_arm64.h"
> -#else
> -
>  /**
> - * Allow or disallow use of SSE4.2 instrinsics for CRC32 hash
> + * Allow or disallow use of SSE4.2/ARMv8 instrinsics for CRC32 hash
>   * calculation.
>   *
>   * @param alg
>   *   An OR of following flags:
> - *   - (CRC32_SW) Don't use SSE4.2 intrinsics
> + *   - (CRC32_SW) Don't use SSE4.2 intrinsics (default non-[x86/ARMv8])
>   *   - (CRC32_SSE42) Use SSE4.2 intrinsics if available
> - *   - (CRC32_SSE42_x64) Use 64-bit SSE4.2 intrinsic if available (default)
> - *
> + *   - (CRC32_SSE42_x64) Use 64-bit SSE4.2 intrinsic if available (default x86)
> + *   - (CRC32_ARM64) Use ARMv8 CRC intrinsic if available
>   */
>  static inline void
>  rte_hash_crc_set_alg(uint8_t alg)
>  {
> -#if defined(RTE_ARCH_X86)
> -	if (alg == CRC32_SSE42_x64 &&
> -			!rte_cpu_get_flag_enabled(RTE_CPUFLAG_EM64T))
> -		alg = CRC32_SSE42;
> +	switch (alg) {
> +	case CRC32_SSE42_x64:
> +	case CRC32_SSE42:
> +#if defined RTE_ARCH_X86
> +		if (!rte_cpu_get_flag_enabled(RTE_CPUFLAG_EM64T))
> +			crc32_alg = CRC32_SSE42;
> +		else
> +			crc32_alg = alg;
> +#endif
> +#if defined RTE_ARCH_ARM64
> +		RTE_LOG(WARNING, HASH,
> +			"Incorrect CRC32 algorithm requested setting best"
> +			"available algorithm on the architecture\n");
> +		rte_hash_crc_set_alg(CRC32_ARM64);
> +#endif
> +		break;
> +	case CRC32_ARM64:
> +#if defined RTE_ARCH_ARM64
> +		if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_CRC32))
> +			crc32_alg = CRC32_ARM64;
>  #endif
> -	crc32_alg = alg;
> +#if defined RTE_ARCH_X86
> +		RTE_LOG(WARNING, HASH,
> +			"Incorrect CRC32 algorithm requested setting best"
> +			"available algorithm on the architecture\n");
> +		rte_hash_crc_set_alg(CRC32_SSE42_x64);
> +#endif
> +		break;
> +	case CRC32_SW:
> +	default:
> +		crc32_alg = CRC32_SW;
> +	break;
> +	}
>  }
> 
>  /* Setting the best available algorithm */
>  RTE_INIT(rte_hash_crc_init_alg)
>  {
> +#if defined RTE_ARCH_X86
>  	rte_hash_crc_set_alg(CRC32_SSE42_x64);
> +#elif defined RTE_ARCH_ARM64
> +	rte_hash_crc_set_alg(CRC32_ARM64);
> +#else
> +	rte_hash_crc_set_alg(CRC32_SW);
> +#endif
>  }
> 
>  /**
> - * Use single crc32 instruction to perform a hash on a byte value.
> - * Fall back to software crc32 implementation in case SSE4.2 is
> - * not supported
> + * Calculate crc32 hash value of 1bytes.
>   *
>   * @param data
>   *   Data to perform hash on.
> @@ -474,15 +545,15 @@ rte_hash_crc_1byte(uint8_t data, uint32_t init_val)
> #if defined RTE_ARCH_X86
>  	if (likely(crc32_alg & CRC32_SSE42))
>  		return crc32c_sse42_u8(data, init_val);
> +#elif defined RTE_ARCH_ARM64
> +	if (likely(crc32_alg & CRC32_ARM64))
> +		return crc32c_arm64_u8(data, init_val);
>  #endif
> -
>  	return crc32c_1byte(data, init_val);
>  }
> 
>  /**
> - * Use single crc32 instruction to perform a hash on a 2 bytes value.
> - * Fall back to software crc32 implementation in case SSE4.2 is
> - * not supported
> + * Calculate crc32 hash value of 2bytes.
>   *
>   * @param data
>   *   Data to perform hash on.
> @@ -497,15 +568,15 @@ rte_hash_crc_2byte(uint16_t data, uint32_t init_val)
> #if defined RTE_ARCH_X86
>  	if (likely(crc32_alg & CRC32_SSE42))
>  		return crc32c_sse42_u16(data, init_val);
> +#elif defined RTE_ARCH_ARM64
> +	if (likely(crc32_alg & CRC32_ARM64))
> +		return crc32c_arm64_u16(data, init_val);
>  #endif
> -
>  	return crc32c_2bytes(data, init_val);
>  }
> 
>  /**
> - * Use single crc32 instruction to perform a hash on a 4 byte value.
> - * Fall back to software crc32 implementation in case SSE4.2 is
> - * not supported
> + * Calculate crc32 hash value of 4bytes.
>   *
>   * @param data
>   *   Data to perform hash on.
> @@ -520,15 +591,15 @@ rte_hash_crc_4byte(uint32_t data, uint32_t init_val)
> #if defined RTE_ARCH_X86
>  	if (likely(crc32_alg & CRC32_SSE42))
>  		return crc32c_sse42_u32(data, init_val);
> +#elif defined RTE_ARCH_ARM64
> +	if (likely(crc32_alg & CRC32_ARM64))
> +		return crc32c_arm64_u32(data, init_val);
>  #endif
> -
> -	return crc32c_1word(data, init_val);
> +	return crc32c_4bytes(data, init_val);
>  }
> 
>  /**
> - * Use single crc32 instruction to perform a hash on a 8 byte value.
> - * Fall back to software crc32 implementation in case SSE4.2 is
> - * not supported
> + * Calculate crc32 hash value of 8bytes.
>   *
>   * @param data
>   *   Data to perform hash on.
> @@ -540,21 +611,19 @@ rte_hash_crc_4byte(uint32_t data, uint32_t init_val)
> static inline uint32_t  rte_hash_crc_8byte(uint64_t data, uint32_t init_val)  { -
> #ifdef RTE_ARCH_X86_64
> -	if (likely(crc32_alg == CRC32_SSE42_x64))
> +#if defined RTE_ARCH_X86_64
> +	if (likely(crc32_alg & CRC32_SSE42_x64))
>  		return crc32c_sse42_u64(data, init_val); -#endif
> -
> -#if defined RTE_ARCH_X86
> +#elif defined RTE_ARCH_X86
>  	if (likely(crc32_alg & CRC32_SSE42))
>  		return crc32c_sse42_u64_mimic(data, init_val);
> +#elif defined RTE_ARCH_ARM64
> +	if (likely(crc32_alg & CRC32_ARM64))
> +		return crc32c_arm64_u64(data, init_val);
>  #endif
> -
> -	return crc32c_2words(data, init_val);
> +	return crc32c_8bytes(data, init_val);
>  }
> 
> -#endif
> -
>  /**
>   * Calculate CRC32 hash on user-supplied byte array.
>   *
> --
> 2.17.1

> 
> > -----Original Message-----
> > From: pbhagavatula@marvell.com <pbhagavatula@marvell.com>
> > Sent: Wednesday, May 13, 2020 4:40 AM
> > To: jerinj@marvell.com; konstantin.ananyev@intel.com;
> > harry.van.haaren@intel.com; Yipeng Wang <yipeng1.wang@intel.com>;
> > Sameh Gobriel <sameh.gobriel@intel.com>; Bruce Richardson
> > <bruce.richardson@intel.com>; Ruifeng Wang <Ruifeng.Wang@arm.com>
> > Cc: dev@dpdk.org; Pavan Nikhilesh <pbhagavatula@marvell.com>
> > Subject: [dpdk-dev] [RFC v2] hash: unify crc32 API header for x86 and ARM
> >
> > From: Pavan Nikhilesh <pbhagavatula@marvell.com>
> >
> > Merge crc32 hash calculation public API headers for x86 and ARM.
> > Select the best available CRC32 algorithm when unsupported algorithm on a
> > given CPU architecture is requested by an application.
> >
> > Previously, if an application directly includes `rte_crc_arm64.h` without
> > including `rte_hash_crc.h` it will fail to compile.
> > Although, `rte_crc_arm64.h` is no longer needed make it a dummy file for
> > ABI purposes.
> >
> > Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
> > ---
> >  v2 Changes:
> >  - Don't remove `rte_crc_arm64.h` for ABI purposes.
> >  - Revert function pointer approach for performance reasons.
> >  - Select the best available algorithm based on the arch when user passes an
> > unsupported crc32 algorithm.
> >
> Maybe split the patch? Changes to select the best available algorithm can be a separate one.
> 
> More ifdefs are added. Is it possible to have arch specific rte_hash_crc_xx implementations
> like what was done in rte_crc_arm64.h, and include specific headers according to arch in rte_hash.crc.h?

Same thought.

> For ABI purpose, rte_crc_arm64.h can be kept and it only includes the new arm64 specific header.
> 
> >  app/test/test_hash.c            |   6 ++
> >  lib/librte_hash/meson.build     |   6 +-
> >  lib/librte_hash/rte_crc_arm64.h | 175 +-------------------------------
> > lib/librte_hash/rte_hash_crc.h  | 153 ++++++++++++++++++++--------
> >  4 files changed, 122 insertions(+), 218 deletions(-)
> >
> > diff --git a/app/test/test_hash.c b/app/test/test_hash.c index
> > afa3a1a3c..7bd457dac 100644
> > --- a/app/test/test_hash.c
> > +++ b/app/test/test_hash.c
> > @@ -195,7 +195,13 @@ test_crc32_hash_alg_equiv(void)
> >  	}
> >
> >  	/* Resetting to best available algorithm */
> > +#if defined RTE_ARCH_X86
> >  	rte_hash_crc_set_alg(CRC32_SSE42_x64);
> > +#elif defined RTE_ARCH_ARM64
> > +	rte_hash_crc_set_alg(CRC32_ARM64);
> > +#else
> > +	rte_hash_crc_set_alg(CRC32_SW);
> > +#endif
> >
> >  	if (i == CRC32_ITERATIONS)
> >  		return 0;
> > diff --git a/lib/librte_hash/meson.build b/lib/librte_hash/meson.build index
> > 6ab46ae9d..8a3cf2f64 100644
> > --- a/lib/librte_hash/meson.build
> > +++ b/lib/librte_hash/meson.build
> > @@ -1,12 +1,14 @@
> >  # SPDX-License-Identifier: BSD-3-Clause  # Copyright(c) 2017 Intel
> > Corporation
> >
> > -headers = files('rte_crc_arm64.h',
> > -	'rte_fbk_hash.h',
> > +headers = files('rte_fbk_hash.h',
> >  	'rte_hash_crc.h',
> >  	'rte_hash.h',
> >  	'rte_jhash.h',
> >  	'rte_thash.h')
> > +if dpdk_conf.has('RTE_ARCH_ARM64')
> > +	headers += files('rte_crc_arm64.h')
> > +endif
> >
> >  sources = files('rte_cuckoo_hash.c', 'rte_fbk_hash.c')  deps += ['ring'] diff --
> > git a/lib/librte_hash/rte_crc_arm64.h b/lib/librte_hash/rte_crc_arm64.h
> > index b4628cfc0..adfcafc7d 100644
> > --- a/lib/librte_hash/rte_crc_arm64.h
> > +++ b/lib/librte_hash/rte_crc_arm64.h
> > @@ -5,179 +5,6 @@
> >  #ifndef _RTE_CRC_ARM64_H_
> >  #define _RTE_CRC_ARM64_H_
> >
> > -/**
> > - * @file
> > - *
> > - * RTE CRC arm64 Hash
> > - */
> > -
> > -#ifdef __cplusplus
> > -extern "C" {
> > -#endif
> > -
> > -#include <stdint.h>
> > -#include <rte_cpuflags.h>
> > -#include <rte_branch_prediction.h>
> > -#include <rte_common.h>
> > -
> > -static inline uint32_t
> > -crc32c_arm64_u8(uint8_t data, uint32_t init_val) -{
> > -	__asm__ volatile(
> > -			"crc32cb %w[crc], %w[crc], %w[value]"
> > -			: [crc] "+r" (init_val)
> > -			: [value] "r" (data));
> > -	return init_val;
> > -}
> > -
> > -static inline uint32_t
> > -crc32c_arm64_u16(uint16_t data, uint32_t init_val) -{
> > -	__asm__ volatile(
> > -			"crc32ch %w[crc], %w[crc], %w[value]"
> > -			: [crc] "+r" (init_val)
> > -			: [value] "r" (data));
> > -	return init_val;
> > -}
> > -
> > -static inline uint32_t
> > -crc32c_arm64_u32(uint32_t data, uint32_t init_val) -{
> > -	__asm__ volatile(
> > -			"crc32cw %w[crc], %w[crc], %w[value]"
> > -			: [crc] "+r" (init_val)
> > -			: [value] "r" (data));
> > -	return init_val;
> > -}
> > -
> > -static inline uint32_t
> > -crc32c_arm64_u64(uint64_t data, uint32_t init_val) -{
> > -	__asm__ volatile(
> > -			"crc32cx %w[crc], %w[crc], %x[value]"
> > -			: [crc] "+r" (init_val)
> > -			: [value] "r" (data));
> > -	return init_val;
> > -}
> > -
> > -/**
> > - * Allow or disallow use of arm64 SIMD instrinsics for CRC32 hash
> > - * calculation.
> > - *
> > - * @param alg
> > - *   An OR of following flags:
> > - *   - (CRC32_SW) Don't use arm64 crc intrinsics
> > - *   - (CRC32_ARM64) Use ARMv8 CRC intrinsic if available
> > - *
> > - */
> > -static inline void
> > -rte_hash_crc_set_alg(uint8_t alg)
> > -{
> > -	switch (alg) {
> > -	case CRC32_ARM64:
> > -		if (!rte_cpu_get_flag_enabled(RTE_CPUFLAG_CRC32))
> > -			alg = CRC32_SW;
> > -		/* fall-through */
> > -	case CRC32_SW:
> > -		crc32_alg = alg;
> > -		/* fall-through */
> > -	default:
> > -		break;
> > -	}
> > -}
> > -
> > -/* Setting the best available algorithm */
> > -RTE_INIT(rte_hash_crc_init_alg)
> > -{
> > -	rte_hash_crc_set_alg(CRC32_ARM64);
> > -}
> > -
> > -/**
> > - * Use single crc32 instruction to perform a hash on a 1 byte value.
> > - * Fall back to software crc32 implementation in case arm64 crc intrinsics is
> > - * not supported
> > - *
> > - * @param data
> > - *   Data to perform hash on.
> > - * @param init_val
> > - *   Value to initialise hash generator.
> > - * @return
> > - *   32bit calculated hash value.
> > - */
> > -static inline uint32_t
> > -rte_hash_crc_1byte(uint8_t data, uint32_t init_val) -{
> > -	if (likely(crc32_alg & CRC32_ARM64))
> > -		return crc32c_arm64_u8(data, init_val);
> > -
> > -	return crc32c_1byte(data, init_val);
> > -}
> > -
> > -/**
> > - * Use single crc32 instruction to perform a hash on a 2 bytes value.
> > - * Fall back to software crc32 implementation in case arm64 crc intrinsics is
> > - * not supported
> > - *
> > - * @param data
> > - *   Data to perform hash on.
> > - * @param init_val
> > - *   Value to initialise hash generator.
> > - * @return
> > - *   32bit calculated hash value.
> > - */
> > -static inline uint32_t
> > -rte_hash_crc_2byte(uint16_t data, uint32_t init_val) -{
> > -	if (likely(crc32_alg & CRC32_ARM64))
> > -		return crc32c_arm64_u16(data, init_val);
> > -
> > -	return crc32c_2bytes(data, init_val);
> > -}
> > -
> > -/**
> > - * Use single crc32 instruction to perform a hash on a 4 byte value.
> > - * Fall back to software crc32 implementation in case arm64 crc intrinsics is
> > - * not supported
> > - *
> > - * @param data
> > - *   Data to perform hash on.
> > - * @param init_val
> > - *   Value to initialise hash generator.
> > - * @return
> > - *   32bit calculated hash value.
> > - */
> > -static inline uint32_t
> > -rte_hash_crc_4byte(uint32_t data, uint32_t init_val) -{
> > -	if (likely(crc32_alg & CRC32_ARM64))
> > -		return crc32c_arm64_u32(data, init_val);
> > -
> > -	return crc32c_1word(data, init_val);
> > -}
> > -
> > -/**
> > - * Use single crc32 instruction to perform a hash on a 8 byte value.
> > - * Fall back to software crc32 implementation in case arm64 crc intrinsics is
> > - * not supported
> > - *
> > - * @param data
> > - *   Data to perform hash on.
> > - * @param init_val
> > - *   Value to initialise hash generator.
> > - * @return
> > - *   32bit calculated hash value.
> > - */
> > -static inline uint32_t
> > -rte_hash_crc_8byte(uint64_t data, uint32_t init_val) -{
> > -	if (likely(crc32_alg == CRC32_ARM64))
> > -		return crc32c_arm64_u64(data, init_val);
> > -
> > -	return crc32c_2words(data, init_val);
> > -}
> > -
> > -#ifdef __cplusplus
> > -}
> > -#endif
> > +#include "rte_hash_crc.h"
> >
> >  #endif /* _RTE_CRC_ARM64_H_ */
> > diff --git a/lib/librte_hash/rte_hash_crc.h b/lib/librte_hash/rte_hash_crc.h
> > index cf28031b3..eaba70c12 100644
> > --- a/lib/librte_hash/rte_hash_crc.h
> > +++ b/lib/librte_hash/rte_hash_crc.h
> > @@ -16,10 +16,12 @@ extern "C" {
> >  #endif
> >
> >  #include <stdint.h>
> > -#include <rte_config.h>
> > -#include <rte_cpuflags.h>
> > +
> >  #include <rte_branch_prediction.h>
> >  #include <rte_common.h>
> > +#include <rte_config.h>
> > +#include <rte_cpuflags.h>
> > +#include <rte_log.h>
> >
> >  /* Lookup tables for software implementation of CRC32C */  static const
> > uint32_t crc32c_tables[8][256] = {{ @@ -322,7 +324,7 @@
> > crc32c_2bytes(uint16_t data, uint32_t init_val)  }
> >
> >  static inline uint32_t
> > -crc32c_1word(uint32_t data, uint32_t init_val)
> > +crc32c_4bytes(uint32_t data, uint32_t init_val)
> >  {
> >  	uint32_t crc, term1, term2;
> >  	crc = init_val;
> > @@ -336,7 +338,7 @@ crc32c_1word(uint32_t data, uint32_t init_val)  }
> >
> >  static inline uint32_t
> > -crc32c_2words(uint64_t data, uint32_t init_val)
> > +crc32c_8bytes(uint64_t data, uint32_t init_val)
> >  {
> >  	uint32_t crc, term1, term2;
> >  	union {
> > @@ -358,6 +360,48 @@ crc32c_2words(uint64_t data, uint32_t init_val)
> >  	return crc;
> >  }
> >
> > +#if defined(RTE_ARCH_ARM64) &&
> > defined(RTE_MACHINE_CPUFLAG_CRC32)
> > +static inline uint32_t
> > +crc32c_arm64_u8(uint8_t data, uint32_t init_val) {
> > +	__asm__ volatile(
> > +			"crc32cb %w[crc], %w[crc], %w[value]"
> > +			: [crc] "+r" (init_val)
> > +			: [value] "r" (data));
> > +	return init_val;
> > +}
> > +
> > +static inline uint32_t
> > +crc32c_arm64_u16(uint16_t data, uint32_t init_val) {
> > +	__asm__ volatile(
> > +			"crc32ch %w[crc], %w[crc], %w[value]"
> > +			: [crc] "+r" (init_val)
> > +			: [value] "r" (data));
> > +	return init_val;
> > +}
> > +
> > +static inline uint32_t
> > +crc32c_arm64_u32(uint32_t data, uint32_t init_val) {
> > +	__asm__ volatile(
> > +			"crc32cw %w[crc], %w[crc], %w[value]"
> > +			: [crc] "+r" (init_val)
> > +			: [value] "r" (data));
> > +	return init_val;
> > +}
> > +
> > +static inline uint32_t
> > +crc32c_arm64_u64(uint64_t data, uint32_t init_val) {
> > +	__asm__ volatile(
> > +			"crc32cx %w[crc], %w[crc], %x[value]"
> > +			: [crc] "+r" (init_val)
> > +			: [value] "r" (data));
> > +	return init_val;
> > +}
> > +#endif
> > +
> >  #if defined(RTE_ARCH_X86)
> >  static inline uint32_t
> >  crc32c_sse42_u8(uint8_t data, uint32_t init_val) @@ -424,42 +468,69 @@
> > crc32c_sse42_u64(uint64_t data, uint64_t init_val)
> >
> >  static uint8_t crc32_alg = CRC32_SW;
> >
> > -#if defined(RTE_ARCH_ARM64) &&
> > defined(RTE_MACHINE_CPUFLAG_CRC32)
> > -#include "rte_crc_arm64.h"
> > -#else
> > -
> >  /**
> > - * Allow or disallow use of SSE4.2 instrinsics for CRC32 hash
> > + * Allow or disallow use of SSE4.2/ARMv8 instrinsics for CRC32 hash
> >   * calculation.
> >   *
> >   * @param alg
> >   *   An OR of following flags:
> > - *   - (CRC32_SW) Don't use SSE4.2 intrinsics
> > + *   - (CRC32_SW) Don't use SSE4.2 intrinsics (default non-[x86/ARMv8])
> >   *   - (CRC32_SSE42) Use SSE4.2 intrinsics if available
> > - *   - (CRC32_SSE42_x64) Use 64-bit SSE4.2 intrinsic if available (default)
> > - *
> > + *   - (CRC32_SSE42_x64) Use 64-bit SSE4.2 intrinsic if available (default x86)
> > + *   - (CRC32_ARM64) Use ARMv8 CRC intrinsic if available
> >   */
> >  static inline void
> >  rte_hash_crc_set_alg(uint8_t alg)
> >  {
> > -#if defined(RTE_ARCH_X86)
> > -	if (alg == CRC32_SSE42_x64 &&
> > -			!rte_cpu_get_flag_enabled(RTE_CPUFLAG_EM64T))
> > -		alg = CRC32_SSE42;
> > +	switch (alg) {
> > +	case CRC32_SSE42_x64:
> > +	case CRC32_SSE42:
> > +#if defined RTE_ARCH_X86
> > +		if (!rte_cpu_get_flag_enabled(RTE_CPUFLAG_EM64T))
> > +			crc32_alg = CRC32_SSE42;
> > +		else
> > +			crc32_alg = alg;
> > +#endif
> > +#if defined RTE_ARCH_ARM64
> > +		RTE_LOG(WARNING, HASH,
> > +			"Incorrect CRC32 algorithm requested setting best"
> > +			"available algorithm on the architecture\n");
> > +		rte_hash_crc_set_alg(CRC32_ARM64);
> > +#endif
> > +		break;
> > +	case CRC32_ARM64:
> > +#if defined RTE_ARCH_ARM64
> > +		if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_CRC32))
> > +			crc32_alg = CRC32_ARM64;
> >  #endif
> > -	crc32_alg = alg;
> > +#if defined RTE_ARCH_X86
> > +		RTE_LOG(WARNING, HASH,
> > +			"Incorrect CRC32 algorithm requested setting best"
> > +			"available algorithm on the architecture\n");
> > +		rte_hash_crc_set_alg(CRC32_SSE42_x64);
> > +#endif
> > +		break;
> > +	case CRC32_SW:
> > +	default:
> > +		crc32_alg = CRC32_SW;
> > +	break;
> > +	}
> >  }
> >
> >  /* Setting the best available algorithm */
> >  RTE_INIT(rte_hash_crc_init_alg)
> >  {
> > +#if defined RTE_ARCH_X86
> >  	rte_hash_crc_set_alg(CRC32_SSE42_x64);
> > +#elif defined RTE_ARCH_ARM64
> > +	rte_hash_crc_set_alg(CRC32_ARM64);
> > +#else
> > +	rte_hash_crc_set_alg(CRC32_SW);
> > +#endif
> >  }
> >
> >  /**
> > - * Use single crc32 instruction to perform a hash on a byte value.
> > - * Fall back to software crc32 implementation in case SSE4.2 is
> > - * not supported
> > + * Calculate crc32 hash value of 1bytes.
> >   *
> >   * @param data
> >   *   Data to perform hash on.
> > @@ -474,15 +545,15 @@ rte_hash_crc_1byte(uint8_t data, uint32_t init_val)
> > #if defined RTE_ARCH_X86
> >  	if (likely(crc32_alg & CRC32_SSE42))
> >  		return crc32c_sse42_u8(data, init_val);
> > +#elif defined RTE_ARCH_ARM64
> > +	if (likely(crc32_alg & CRC32_ARM64))
> > +		return crc32c_arm64_u8(data, init_val);
> >  #endif
> > -
> >  	return crc32c_1byte(data, init_val);
> >  }
> >
> >  /**
> > - * Use single crc32 instruction to perform a hash on a 2 bytes value.
> > - * Fall back to software crc32 implementation in case SSE4.2 is
> > - * not supported
> > + * Calculate crc32 hash value of 2bytes.
> >   *
> >   * @param data
> >   *   Data to perform hash on.
> > @@ -497,15 +568,15 @@ rte_hash_crc_2byte(uint16_t data, uint32_t init_val)
> > #if defined RTE_ARCH_X86
> >  	if (likely(crc32_alg & CRC32_SSE42))
> >  		return crc32c_sse42_u16(data, init_val);
> > +#elif defined RTE_ARCH_ARM64
> > +	if (likely(crc32_alg & CRC32_ARM64))
> > +		return crc32c_arm64_u16(data, init_val);
> >  #endif
> > -
> >  	return crc32c_2bytes(data, init_val);
> >  }
> >
> >  /**
> > - * Use single crc32 instruction to perform a hash on a 4 byte value.
> > - * Fall back to software crc32 implementation in case SSE4.2 is
> > - * not supported
> > + * Calculate crc32 hash value of 4bytes.
> >   *
> >   * @param data
> >   *   Data to perform hash on.
> > @@ -520,15 +591,15 @@ rte_hash_crc_4byte(uint32_t data, uint32_t init_val)
> > #if defined RTE_ARCH_X86
> >  	if (likely(crc32_alg & CRC32_SSE42))
> >  		return crc32c_sse42_u32(data, init_val);
> > +#elif defined RTE_ARCH_ARM64
> > +	if (likely(crc32_alg & CRC32_ARM64))
> > +		return crc32c_arm64_u32(data, init_val);
> >  #endif
> > -
> > -	return crc32c_1word(data, init_val);
> > +	return crc32c_4bytes(data, init_val);
> >  }
> >
> >  /**
> > - * Use single crc32 instruction to perform a hash on a 8 byte value.
> > - * Fall back to software crc32 implementation in case SSE4.2 is
> > - * not supported
> > + * Calculate crc32 hash value of 8bytes.
> >   *
> >   * @param data
> >   *   Data to perform hash on.
> > @@ -540,21 +611,19 @@ rte_hash_crc_4byte(uint32_t data, uint32_t init_val)
> > static inline uint32_t  rte_hash_crc_8byte(uint64_t data, uint32_t init_val)  { -
> > #ifdef RTE_ARCH_X86_64
> > -	if (likely(crc32_alg == CRC32_SSE42_x64))
> > +#if defined RTE_ARCH_X86_64
> > +	if (likely(crc32_alg & CRC32_SSE42_x64))
> >  		return crc32c_sse42_u64(data, init_val); -#endif
> > -
> > -#if defined RTE_ARCH_X86
> > +#elif defined RTE_ARCH_X86
> >  	if (likely(crc32_alg & CRC32_SSE42))
> >  		return crc32c_sse42_u64_mimic(data, init_val);
> > +#elif defined RTE_ARCH_ARM64
> > +	if (likely(crc32_alg & CRC32_ARM64))
> > +		return crc32c_arm64_u64(data, init_val);
> >  #endif
> > -
> > -	return crc32c_2words(data, init_val);
> > +	return crc32c_8bytes(data, init_val);
> >  }
> >
> > -#endif
> > -
> >  /**
> >   * Calculate CRC32 hash on user-supplied byte array.
> >   *
> > --
> > 2.17.1