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 516c277..6c233b7 100644 (file)
--- 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;
+                       }
                }
        }