[v4,16/17] net: add checks for max SIMD bitwidth

Message ID 20201013103817.305423-17-ciara.power@intel.com (mailing list archive)
State Superseded, archived
Headers
Series add max SIMD bitwidth to EAL |

Checks

Context Check Description
ci/checkpatch success coding style OK

Commit Message

Power, Ciara Oct. 13, 2020, 10:38 a.m. UTC
  When choosing a vector path to take, an extra condition must be
satisfied to ensure the max SIMD bitwidth allows for the CPU enabled
path.

The vector path was initially chosen in RTE_INIT, however this is no
longer suitable as we cannot check the max SIMD bitwidth at that time.
Default handlers are now chosen in RTE_INIT, these default handlers
are used the first time the crc calc is called, and they set the suitable
handlers to be used going forward.

Suggested-by: Jasvinder Singh <jasvinder.singh@intel.com>
Suggested-by: Olivier Matz <olivier.matz@6wind.com>

Signed-off-by: Ciara Power <ciara.power@intel.com>

---
v4:
  - Added default handlers to be set at RTE_INIT time, rather than
    choosing scalar handlers.
  - Modified logging.
  - Updated enum name.
v3:
  - Moved choosing vector paths out of RTE_INIT.
  - Moved checking max_simd_bitwidth into the set_alg function.
---
 lib/librte_net/rte_net_crc.c | 75 ++++++++++++++++++++++++++++++------
 lib/librte_net/rte_net_crc.h |  8 ++++
 2 files changed, 72 insertions(+), 11 deletions(-)
  

Patch

diff --git a/lib/librte_net/rte_net_crc.c b/lib/librte_net/rte_net_crc.c
index 4f5b9e8286..11d0161a32 100644
--- a/lib/librte_net/rte_net_crc.c
+++ b/lib/librte_net/rte_net_crc.c
@@ -9,6 +9,7 @@ 
 #include <rte_cpuflags.h>
 #include <rte_common.h>
 #include <rte_net_crc.h>
+#include <rte_eal.h>
 
 #if defined(RTE_ARCH_X86_64) && defined(__PCLMUL__)
 #define X86_64_SSE42_PCLMULQDQ     1
@@ -32,6 +33,12 @@ 
 static uint32_t crc32_eth_lut[CRC_LUT_SIZE];
 static uint32_t crc16_ccitt_lut[CRC_LUT_SIZE];
 
+static uint32_t
+rte_crc16_ccitt_default_handler(const uint8_t *data, uint32_t data_len);
+
+static uint32_t
+rte_crc32_eth_default_handler(const uint8_t *data, uint32_t data_len);
+
 static uint32_t
 rte_crc16_ccitt_handler(const uint8_t *data, uint32_t data_len);
 
@@ -41,7 +48,12 @@  rte_crc32_eth_handler(const uint8_t *data, uint32_t data_len);
 typedef uint32_t
 (*rte_net_crc_handler)(const uint8_t *data, uint32_t data_len);
 
-static rte_net_crc_handler *handlers;
+static rte_net_crc_handler handlers_default[] = {
+	[RTE_NET_CRC16_CCITT] = rte_crc16_ccitt_default_handler,
+	[RTE_NET_CRC32_ETH] = rte_crc32_eth_default_handler,
+};
+
+static rte_net_crc_handler *handlers = handlers_default;
 
 static rte_net_crc_handler handlers_scalar[] = {
 	[RTE_NET_CRC16_CCITT] = rte_crc16_ccitt_handler,
@@ -60,6 +72,9 @@  static rte_net_crc_handler handlers_neon[] = {
 };
 #endif
 
+static uint16_t max_simd_bitwidth;
+RTE_LOG_REGISTER(libnet_logtype, lib.net, INFO);
+
 /**
  * Reflect the bits about the middle
  *
@@ -112,6 +127,42 @@  crc32_eth_calc_lut(const uint8_t *data,
 	return crc;
 }
 
+static uint32_t
+rte_crc16_ccitt_default_handler(const uint8_t *data, uint32_t data_len)
+{
+	if (max_simd_bitwidth == 0)
+		max_simd_bitwidth = rte_get_max_simd_bitwidth();
+	handlers = handlers_scalar;
+#ifdef X86_64_SSE42_PCLMULQDQ
+	if (max_simd_bitwidth >= RTE_SIMD_128)
+		handlers = handlers_sse42;
+#endif
+#ifdef ARM64_NEON_PMULL
+	if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_PMULL) &&
+			max_simd_bitwidth >= RTE_SIMD_128) {
+		handlers = handlers_neon;
+#endif
+	return handlers[RTE_NET_CRC16_CCITT](data, data_len);
+}
+
+static uint32_t
+rte_crc32_eth_default_handler(const uint8_t *data, uint32_t data_len)
+{
+	if (max_simd_bitwidth == 0)
+		max_simd_bitwidth = rte_get_max_simd_bitwidth();
+	handlers = handlers_scalar;
+#ifdef X86_64_SSE42_PCLMULQDQ
+	if (max_simd_bitwidth >= RTE_SIMD_128)
+		handlers = handlers_sse42;
+#endif
+#ifdef ARM64_NEON_PMULL
+	if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_PMULL) &&
+			max_simd_bitwidth >= RTE_SIMD_128) {
+		handlers = handlers_neon;
+#endif
+	return handlers[RTE_NET_CRC32_ETH](data, data_len);
+}
+
 static void
 rte_net_crc_scalar_init(void)
 {
@@ -145,18 +196,26 @@  rte_crc32_eth_handler(const uint8_t *data, uint32_t data_len)
 void
 rte_net_crc_set_alg(enum rte_net_crc_alg alg)
 {
+	if (max_simd_bitwidth == 0)
+		max_simd_bitwidth = rte_get_max_simd_bitwidth();
+
 	switch (alg) {
 #ifdef X86_64_SSE42_PCLMULQDQ
 	case RTE_NET_CRC_SSE42:
-		handlers = handlers_sse42;
-		break;
+		if (max_simd_bitwidth >= RTE_SIMD_128) {
+			handlers = handlers_sse42;
+			return;
+		}
+		NET_LOG(INFO, "Max SIMD Bitwidth too low, can't use SSE\n");
 #elif defined ARM64_NEON_PMULL
 		/* fall-through */
 	case RTE_NET_CRC_NEON:
-		if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_PMULL)) {
+		if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_PMULL) &&
+				max_simd_bitwidth >= RTE_SIMD_128) {
 			handlers = handlers_neon;
-			break;
+			return;
 		}
+		NET_LOG(INFO, "Max SIMD Bitwidth too low or CPU flag not enabled, can't use NEON\n");
 #endif
 		/* fall-through */
 	case RTE_NET_CRC_SCALAR:
@@ -184,19 +243,13 @@  rte_net_crc_calc(const void *data,
 /* Select highest available crc algorithm as default one */
 RTE_INIT(rte_net_crc_init)
 {
-	enum rte_net_crc_alg alg = RTE_NET_CRC_SCALAR;
-
 	rte_net_crc_scalar_init();
 
 #ifdef X86_64_SSE42_PCLMULQDQ
-	alg = RTE_NET_CRC_SSE42;
 	rte_net_crc_sse42_init();
 #elif defined ARM64_NEON_PMULL
 	if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_PMULL)) {
-		alg = RTE_NET_CRC_NEON;
 		rte_net_crc_neon_init();
 	}
 #endif
-
-	rte_net_crc_set_alg(alg);
 }
diff --git a/lib/librte_net/rte_net_crc.h b/lib/librte_net/rte_net_crc.h
index 16e85ca970..c942865ecf 100644
--- a/lib/librte_net/rte_net_crc.h
+++ b/lib/librte_net/rte_net_crc.h
@@ -7,6 +7,8 @@ 
 
 #include <stdint.h>
 
+#include <rte_log.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -25,6 +27,12 @@  enum rte_net_crc_alg {
 	RTE_NET_CRC_NEON,
 };
 
+extern int libnet_logtype;
+
+#define NET_LOG(level, fmt, args...)					\
+	rte_log(RTE_LOG_ ## level, libnet_logtype, "%s(): " fmt "\n",	\
+		__func__, ## args)
+
 /**
  * This API set the CRC computation algorithm (i.e. scalar version,
  * x86 64-bit sse4.2 intrinsic version, etc.) and internal data