[dpdk-dev] [dpdk-dev v2] crypto/aesni_gcm: fix performance issue

[Kai Ji]

This patch fixes the aesni_gcm performance issue on systems with AVX512
CPU flag presented but with VAES CPU flag missing, such as Skylake.

Fixes: 81fe96a0cece ("crypto/aesni_gcm: use architecture independent API")
Cc: pablo.de.lara.guarch at intel.com

Signed-off-by: Kai Ji <kai.ji at intel.com>
---
v2: Checkpatch fix

 drivers/crypto/aesni_gcm/aesni_gcm_pmd.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/aesni_gcm/aesni_gcm_pmd.c b/drivers/crypto/aesni_gcm/aesni_gcm_pmd.c
index bc87e44a9d..886e2a5aaa 100644
--- a/drivers/crypto/aesni_gcm/aesni_gcm_pmd.c
+++ b/drivers/crypto/aesni_gcm/aesni_gcm_pmd.c
@@ -842,8 +842,14 @@ aesni_gcm_create(const char *name,
 		init_mb_mgr_avx2(mb_mgr);
 		break;
 	case RTE_AESNI_GCM_AVX512:
-		dev->feature_flags |= RTE_CRYPTODEV_FF_CPU_AVX512;
-		init_mb_mgr_avx512(mb_mgr);
+		if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_VAES)) {
+			dev->feature_flags |= RTE_CRYPTODEV_FF_CPU_AVX512;
+			init_mb_mgr_avx512(mb_mgr);
+		} else {
+			dev->feature_flags |= RTE_CRYPTODEV_FF_CPU_AVX2;
+			init_mb_mgr_avx2(mb_mgr);
+			vector_mode = RTE_AESNI_GCM_AVX2;
+		}
 		break;
 	default:
 		AESNI_GCM_LOG(ERR, "Unsupported vector mode %u\n", vector_mode);
-- 
2.17.1