X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=lib%2Flibrte_hash%2Frte_hash_crc.h;h=63e74aa4742201b85b8f24c8a553bf18ac55926d;hb=fed622dfd90ffc754808ecb464d7e62e77f0da58;hp=1cd626cb4abe2a47a05ab864163760e7238e0bb4;hpb=42a03256321858a576cef1d2c351b1015b3b4bf4;p=dpdk.git

diff --git a/lib/librte_hash/rte_hash_crc.h b/lib/librte_hash/rte_hash_crc.h
index 1cd626cb4a..63e74aa474 100644
--- a/lib/librte_hash/rte_hash_crc.h
+++ b/lib/librte_hash/rte_hash_crc.h
@@ -327,6 +327,28 @@ static const uint32_t crc32c_tables[8][256] = {{
 	(crc32c_tables[(n)][(crc) & 0xFF] ^ \
 	 crc32c_tables[(n)-1][((crc) >> 8) & 0xFF])
 
+static inline uint32_t
+crc32c_1byte(uint8_t data, uint32_t init_val)
+{
+	uint32_t crc;
+	crc = init_val;
+	crc ^= data;
+
+	return crc32c_tables[0][crc & 0xff] ^ (crc >> 8);
+}
+
+static inline uint32_t
+crc32c_2bytes(uint16_t data, uint32_t init_val)
+{
+	uint32_t crc;
+	crc = init_val;
+	crc ^= data;
+
+	crc = CRC32_UPD(crc, 1) ^ (crc >> 16);
+
+	return crc;
+}
+
 static inline uint32_t
 crc32c_1word(uint32_t data, uint32_t init_val)
 {
@@ -366,6 +388,26 @@ crc32c_2words(uint64_t data, uint32_t init_val)
 }
 
 #if defined(RTE_ARCH_I686) || defined(RTE_ARCH_X86_64)
+static inline uint32_t
+crc32c_sse42_u8(uint8_t data, uint32_t init_val)
+{
+	__asm__ volatile(
+			"crc32b %[data], %[init_val];"
+			: [init_val] "+r" (init_val)
+			: [data] "rm" (data));
+	return init_val;
+}
+
+static inline uint32_t
+crc32c_sse42_u16(uint16_t data, uint32_t init_val)
+{
+	__asm__ volatile(
+			"crc32w %[data], %[init_val];"
+			: [init_val] "+r" (init_val)
+			: [data] "rm" (data));
+	return init_val;
+}
+
 static inline uint32_t
 crc32c_sse42_u32(uint32_t data, uint32_t init_val)
 {
@@ -407,9 +449,14 @@ crc32c_sse42_u64(uint64_t data, uint64_t init_val)
 #define CRC32_SSE42         (1U << 1)
 #define CRC32_x64           (1U << 2)
 #define CRC32_SSE42_x64     (CRC32_x64|CRC32_SSE42)
+#define CRC32_ARM64         (1U << 3)
 
 static uint8_t crc32_alg = CRC32_SW;
 
+#if defined(RTE_ARCH_ARM64)
+#include "rte_crc_arm64.h"
+#else
+
 /**
  * Allow or disallow use of SSE4.2 instrinsics for CRC32 hash
  * calculation.
@@ -425,12 +472,14 @@ static inline void
 rte_hash_crc_set_alg(uint8_t alg)
 {
 	switch (alg) {
+#if defined(RTE_ARCH_I686) || defined(RTE_ARCH_X86_64)
 	case CRC32_SSE42_x64:
 		if (! rte_cpu_get_flag_enabled(RTE_CPUFLAG_EM64T))
 			alg = CRC32_SSE42;
 	case CRC32_SSE42:
 		if (! rte_cpu_get_flag_enabled(RTE_CPUFLAG_SSE4_2))
 			alg = CRC32_SW;
+#endif
 	case CRC32_SW:
 		crc32_alg = alg;
 	default:
@@ -445,6 +494,52 @@ rte_hash_crc_init_alg(void)
 	rte_hash_crc_set_alg(CRC32_SSE42_x64);
 }
 
+/**
+ * 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_I686 || defined RTE_ARCH_X86_64
+	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_I686 || defined RTE_ARCH_X86_64
+	if (likely(crc32_alg & CRC32_SSE42))
+		return crc32c_sse42_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
@@ -496,6 +591,8 @@ rte_hash_crc_8byte(uint64_t data, uint32_t init_val)
 	return crc32c_2words(data, init_val);
 }
 
+#endif
+
 /**
  * Calculate CRC32 hash on user-supplied byte array.
  *
@@ -512,42 +609,26 @@ static inline uint32_t
 rte_hash_crc(const void *data, uint32_t data_len, uint32_t init_val)
 {
 	unsigned i;
-	uint64_t temp = 0;
-	const uint64_t *p64 = (const uint64_t *)data;
+	uintptr_t pd = (uintptr_t) data;
 
 	for (i = 0; i < data_len / 8; i++) {
-		init_val = rte_hash_crc_8byte(*p64++, init_val);
+		init_val = rte_hash_crc_8byte(*(const uint64_t *)pd, init_val);
+		pd += 8;
 	}
 
-	switch (7 - (data_len & 0x07)) {
-	case 0:
-		temp |= (uint64_t) *((const uint8_t *)p64 + 6) << 48;
-		/* Fallthrough */
-	case 1:
-		temp |= (uint64_t) *((const uint8_t *)p64 + 5) << 40;
-		/* Fallthrough */
-	case 2:
-		temp |= (uint64_t) *((const uint8_t *)p64 + 4) << 32;
-		temp |= *((const uint32_t *)p64);
-		init_val = rte_hash_crc_8byte(temp, init_val);
-		break;
-	case 3:
-		init_val = rte_hash_crc_4byte(*(const uint32_t *)p64, init_val);
-		break;
-	case 4:
-		temp |= *((const uint8_t *)p64 + 2) << 16;
-		/* Fallthrough */
-	case 5:
-		temp |= *((const uint8_t *)p64 + 1) << 8;
-		/* Fallthrough */
-	case 6:
-		temp |= *((const uint8_t *)p64);
-		init_val = rte_hash_crc_4byte(temp, init_val);
-		/* Fallthrough */
-	default:
-		break;
+	if (data_len & 0x4) {
+		init_val = rte_hash_crc_4byte(*(const uint32_t *)pd, init_val);
+		pd += 4;
 	}
 
+	if (data_len & 0x2) {
+		init_val = rte_hash_crc_2byte(*(const uint16_t *)pd, init_val);
+		pd += 2;
+	}
+
+	if (data_len & 0x1)
+		init_val = rte_hash_crc_1byte(*(const uint8_t *)pd, init_val);
+
 	return init_val;
 }