[PATCH v8 2/2] hash: unify crc32 selection for x86 and Arm

[Pavan Nikhilesh <pbhagavatula@marvell.com>]

Merge crc32 hash calculation public API implementation 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.

Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
---
 lib/hash/meson.build       |   1 +
 lib/hash/rte_crc_arm64.h   |  69 +++---------------
 lib/hash/rte_crc_generic.h |  72 ++++++++++++++++++
 lib/hash/rte_crc_x86.h     |  89 +++++++++++++++++++++++
 lib/hash/rte_hash_crc.h    | 145 ++++++++++---------------------------
 5 files changed, 210 insertions(+), 166 deletions(-)
 create mode 100644 lib/hash/rte_crc_generic.h

diff --git a/lib/hash/meson.build b/lib/hash/meson.build
index ff13e2c7f9..b36c8b0c01 100644
--- a/lib/hash/meson.build
+++ b/lib/hash/meson.build
@@ -13,6 +13,7 @@ indirect_headers += files(
         'rte_crc_sw.h',
         'rte_crc_x86.h',
         'rte_crc_arm64.h',
+        'rte_crc_generic.h',
         'rte_thash_x86_gfni.h',
 )
 
diff --git a/lib/hash/rte_crc_arm64.h b/lib/hash/rte_crc_arm64.h
index b4628cfc09..172894335f 100644
--- a/lib/hash/rte_crc_arm64.h
+++ b/lib/hash/rte_crc_arm64.h
@@ -2,23 +2,8 @@
  * Copyright(c) 2015 Cavium, Inc
  */
 
-#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>
+#ifndef _HASH_CRC_ARM64_H_
+#define _HASH_CRC_ARM64_H_
 
 static inline uint32_t
 crc32c_arm64_u8(uint8_t data, uint32_t init_val)
@@ -61,40 +46,8 @@ crc32c_arm64_u64(uint64_t data, uint32_t 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
+ * Use single crc32 instruction to perform a hash on a byte value.
+ * Fall back to software crc32 implementation in case ARM CRC is
  * not supported
  *
  * @param data
@@ -115,7 +68,7 @@ rte_hash_crc_1byte(uint8_t data, uint32_t 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
+ * Fall back to software crc32 implementation in case ARM CRC is
  * not supported
  *
  * @param data
@@ -136,7 +89,7 @@ rte_hash_crc_2byte(uint16_t data, uint32_t 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
+ * Fall back to software crc32 implementation in case ARM CRC is
  * not supported
  *
  * @param data
@@ -157,7 +110,7 @@ rte_hash_crc_4byte(uint32_t data, uint32_t 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
+ * Fall back to software crc32 implementation in case ARM CRC is
  * not supported
  *
  * @param data
@@ -170,14 +123,10 @@ 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)
 {
-	if (likely(crc32_alg == CRC32_ARM64))
+	if (likely(crc32_alg & CRC32_ARM64))
 		return crc32c_arm64_u64(data, init_val);
 
 	return crc32c_2words(data, init_val);
 }
 
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* _RTE_CRC_ARM64_H_ */
+#endif /* _HASH_CRC_ARM64_H_ */
diff --git a/lib/hash/rte_crc_generic.h b/lib/hash/rte_crc_generic.h
new file mode 100644
index 0000000000..0c55947896
--- /dev/null
+++ b/lib/hash/rte_crc_generic.h
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2022 Marvell.
+ */
+
+#ifndef _HASH_CRC_GENERIC_H_
+#define _HASH_CRC_GENERIC_H_
+
+/**
+ * Software crc32 implementation for 1 byte value.
+ *
+ * @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)
+{
+	return crc32c_1byte(data, init_val);
+}
+
+/**
+ * Software crc32 implementation for 2 byte value.
+ *
+ * @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)
+{
+	return crc32c_2bytes(data, init_val);
+}
+
+/**
+ * Software crc32 implementation for 4 byte value.
+ *
+ * @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)
+{
+	return crc32c_1word(data, init_val);
+}
+
+/**
+ * Software crc32 implementation for 8 byte value.
+ *
+ * @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)
+{
+	return crc32c_2words(data, init_val);
+}
+
+#endif
diff --git a/lib/hash/rte_crc_x86.h b/lib/hash/rte_crc_x86.h
index b80a742afa..19eb3584e7 100644
--- a/lib/hash/rte_crc_x86.h
+++ b/lib/hash/rte_crc_x86.h
@@ -59,4 +59,93 @@ crc32c_sse42_u64(uint64_t data, uint64_t init_val)
 	return (uint32_t)init_val;
 }
 
+/**
+ * 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
+ *
+ * @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_SSE42))
+		return crc32c_sse42_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 SSE4.2 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_SSE42))
+		return crc32c_sse42_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 SSE4.2 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_SSE42))
+		return crc32c_sse42_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 SSE4.2 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)
+{
+#ifdef RTE_ARCH_X86_64
+	if (likely(crc32_alg == CRC32_SSE42_x64))
+		return crc32c_sse42_u64(data, init_val);
+#endif
+
+	if (likely(crc32_alg & CRC32_SSE42))
+		return crc32c_sse42_u64_mimic(data, init_val);
+
+	return crc32c_2words(data, init_val);
+}
+
 #endif
diff --git a/lib/hash/rte_hash_crc.h b/lib/hash/rte_hash_crc.h
index 308fdde414..cd9ec17082 100644
--- a/lib/hash/rte_hash_crc.h
+++ b/lib/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>
 
 #include "rte_crc_sw.h"
 
@@ -33,136 +35,67 @@ static uint8_t crc32_alg = CRC32_SW;
 
 #if defined(RTE_ARCH_ARM64) && defined(__ARM_FEATURE_CRC32)
 #include "rte_crc_arm64.h"
-#else
+#elif defined(RTE_ARCH_X86)
 #include "rte_crc_x86.h"
+#else
+#include "rte_crc_generic.h"
+#endif
 
 /**
- * Allow or disallow use of SSE4.2 instrinsics for CRC32 hash
+ * Allow or disallow use of SSE4.2/ARMv8 intrinsics 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/ARMv8 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 (default ARMv8)
  *
  */
 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;
-#endif
-	crc32_alg = alg;
-}
+	crc32_alg = CRC32_SW;
 
-/* Setting the best available algorithm */
-RTE_INIT(rte_hash_crc_init_alg)
-{
-	rte_hash_crc_set_alg(CRC32_SSE42_x64);
-}
+	if (alg == CRC32_SW)
+		return;
 
-/**
- * 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
- *
- * @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 defined RTE_ARCH_X86
-	if (likely(crc32_alg & CRC32_SSE42))
-		return crc32c_sse42_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
- *
- * @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 defined RTE_ARCH_X86
-	if (likely(crc32_alg & CRC32_SSE42))
-		return crc32c_sse42_u16(data, init_val);
+	if (!(alg & CRC32_SSE42_x64))
+		RTE_LOG(WARNING, HASH,
+			"Unsupported CRC32 algorithm requested using CRC32_x64/CRC32_SSE42\n");
+	if (!rte_cpu_get_flag_enabled(RTE_CPUFLAG_EM64T))
+		crc32_alg = CRC32_SSE42;
+	else
+		crc32_alg = CRC32_SSE42_x64;
 #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
- *
- * @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 defined RTE_ARCH_X86
-	if (likely(crc32_alg & CRC32_SSE42))
-		return crc32c_sse42_u32(data, init_val);
+#if defined RTE_ARCH_ARM64
+	if (!(alg & CRC32_ARM64))
+		RTE_LOG(WARNING, HASH,
+			"Unsupported CRC32 algorithm requested using CRC32_ARM64\n");
+	if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_CRC32))
+		crc32_alg = CRC32_ARM64;
 #endif
 
-	return crc32c_1word(data, init_val);
+	if (crc32_alg == CRC32_SW)
+		RTE_LOG(WARNING, HASH,
+			"Unsupported CRC32 algorithm requested using CRC32_SW\n");
 }
 
-/**
- * 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
- *
- * @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)
+/* Setting the best available algorithm */
+RTE_INIT(rte_hash_crc_init_alg)
 {
-#ifdef RTE_ARCH_X86_64
-	if (likely(crc32_alg == CRC32_SSE42_x64))
-		return crc32c_sse42_u64(data, init_val);
-#endif
-
-#if defined RTE_ARCH_X86
-	if (likely(crc32_alg & CRC32_SSE42))
-		return crc32c_sse42_u64_mimic(data, init_val);
+#if defined(RTE_ARCH_X86)
+	rte_hash_crc_set_alg(CRC32_SSE42_x64);
+#elif defined(RTE_ARCH_ARM64) && defined(__ARM_FEATURE_CRC32)
+	rte_hash_crc_set_alg(CRC32_ARM64);
+#else
+	rte_hash_crc_set_alg(CRC32_SW);
 #endif
-
-	return crc32c_2words(data, init_val);
 }
 
-#endif
-
 /**
  * Calculate CRC32 hash on user-supplied byte array.
  *
-- 
2.25.1