[dpdk-dev] [PATCH] net/virtio: fix AVX512 datapath selection

[Maxime Coquelin <maxime.coquelin@redhat.com>]

The AVX512 packed ring datapath selection was only done
at build time, but it should also be checked at runtime
that the CPU supports it.

This patch add a CPU flags check so that non-vectorized
path is selected at runtime if AVX512 is not supported.

Fixes: ccb10995c2ad ("net/virtio: add election for vectorized path")

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
 drivers/net/virtio/virtio_ethdev.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index 312871cb48..49ccef12c7 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -1965,8 +1965,10 @@ eth_virtio_dev_init(struct rte_eth_dev *eth_dev)
 			PMD_DRV_LOG(INFO,
 				"building environment do not support packed ring vectorized");
 #else
-			hw->use_vec_rx = 1;
-			hw->use_vec_tx = 1;
+			if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX512F)) {
+				hw->use_vec_rx = 1;
+				hw->use_vec_tx = 1;
+			}
 #endif
 		}
 	}
-- 
2.25.4