From: Ciara Power <ciara.power@intel.com>
Date: Mon, 19 Oct 2020 13:48:52 +0000 (+0200)
Subject: net/virtio: check max SIMD bitwidth
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=7566f28ab09bc5d38f7d0049bd017c2cc44a9629;p=dpdk.git

net/virtio: check max SIMD bitwidth

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@intel.com>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>
Acked-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index 516c277f9c..6c233b75ba 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -23,6 +23,7 @@
 #include <rte_common.h>
 #include <rte_errno.h>
 #include <rte_cpuflags.h>
+#include <rte_vect.h>
 
 #include <rte_memory.h>
 #include <rte_eal.h>
@@ -2312,7 +2313,8 @@ virtio_dev_configure(struct rte_eth_dev *dev)
 		if ((hw->use_vec_rx || hw->use_vec_tx) &&
 		    (!rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX512F) ||
 		     !vtpci_with_feature(hw, VIRTIO_F_IN_ORDER) ||
-		     !vtpci_with_feature(hw, VIRTIO_F_VERSION_1))) {
+		     !vtpci_with_feature(hw, VIRTIO_F_VERSION_1) ||
+		     rte_vect_get_max_simd_bitwidth() < RTE_VECT_SIMD_512)) {
 			PMD_DRV_LOG(INFO,
 				"disabled packed ring vectorized path for requirements not met");
 			hw->use_vec_rx = 0;
@@ -2365,6 +2367,12 @@ virtio_dev_configure(struct rte_eth_dev *dev)
 					"disabled split ring vectorized rx for offloading enabled");
 				hw->use_vec_rx = 0;
 			}
+
+			if (rte_vect_get_max_simd_bitwidth() < RTE_VECT_SIMD_128) {
+				PMD_DRV_LOG(INFO,
+					"disabled split ring vectorized rx, max SIMD bitwidth too low");
+				hw->use_vec_rx = 0;
+			}
 		}
 	}