[dpdk-dev] [PATCH v10 15/18] efd: check max SIMD bitwidth
David Marchand
david.marchand at redhat.com
Mon Oct 19 15:48:55 CEST 2020
From: Ciara Power <ciara.power at intel.com>
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.
Signed-off-by: Ciara Power <ciara.power at intel.com>
Acked-by: Yipeng Wang <yipeng1.wang at intel.com>
---
v4: Updated enum name.
---
lib/librte_efd/rte_efd.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/lib/librte_efd/rte_efd.c b/lib/librte_efd/rte_efd.c
index 6a799556d4..ec3a4cd58e 100644
--- a/lib/librte_efd/rte_efd.c
+++ b/lib/librte_efd/rte_efd.c
@@ -21,6 +21,7 @@
#include <rte_jhash.h>
#include <rte_hash_crc.h>
#include <rte_tailq.h>
+#include <rte_vect.h>
#include "rte_efd.h"
#if defined(RTE_ARCH_X86)
@@ -645,7 +646,9 @@ rte_efd_create(const char *name, uint32_t max_num_rules, uint32_t key_len,
* For less than 4 bits, scalar function performs better
* than vectorised version
*/
- if (RTE_EFD_VALUE_NUM_BITS > 3 && rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX2))
+ if (RTE_EFD_VALUE_NUM_BITS > 3
+ && rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX2)
+ && rte_vect_get_max_simd_bitwidth() >= RTE_VECT_SIMD_256)
table->lookup_fn = EFD_LOOKUP_AVX2;
else
#endif
@@ -655,7 +658,8 @@ rte_efd_create(const char *name, uint32_t max_num_rules, uint32_t key_len,
* than vectorised version
*/
if (RTE_EFD_VALUE_NUM_BITS > 16 &&
- rte_cpu_get_flag_enabled(RTE_CPUFLAG_NEON))
+ rte_cpu_get_flag_enabled(RTE_CPUFLAG_NEON) &&
+ rte_vect_get_max_simd_bitwidth() >= RTE_VECT_SIMD_128)
table->lookup_fn = EFD_LOOKUP_NEON;
else
#endif
--
2.23.0
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