[dpdk-dev] [PATCH 20.11 12/12] net/virtio: add checks for max SIMD bitwidth

[Ciara Power]

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.

Cc: Maxime Coquelin <maxime.coque...@redhat.com>
Cc: Chenbo Xia <chenbo....@intel.com>
Cc: Zhihong Wang <zhihong.w...@intel.com>

Signed-off-by: Ciara Power <ciara.po...@intel.com>
---
 drivers/net/virtio/virtio_ethdev.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/net/virtio/virtio_ethdev.c 
b/drivers/net/virtio/virtio_ethdev.c
index dc0093bdf0..f779ce8396 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -1517,9 +1517,11 @@ set_rxtx_funcs(struct rte_eth_dev *eth_dev)
        if (vtpci_packed_queue(hw)) {
                PMD_INIT_LOG(INFO,
                        "virtio: using packed ring %s Tx path on port %u",
-                       hw->use_vec_tx ? "vectorized" : "standard",
+                       (hw->use_vec_tx && rte_get_max_simd_bitwidth()
+                       > RTE_MAX_256_SIMD) ? "vectorized" : "standard",
                        eth_dev->data->port_id);
-               if (hw->use_vec_tx)
+               if (hw->use_vec_tx && rte_get_max_simd_bitwidth()
+                               > RTE_MAX_256_SIMD)
                        eth_dev->tx_pkt_burst = virtio_xmit_pkts_packed_vec;
                else
                        eth_dev->tx_pkt_burst = virtio_xmit_pkts_packed;
@@ -1536,7 +1538,8 @@ set_rxtx_funcs(struct rte_eth_dev *eth_dev)
        }
 
        if (vtpci_packed_queue(hw)) {
-               if (hw->use_vec_rx) {
+               if (hw->use_vec_rx && rte_get_max_simd_bitwidth()
+                               > RTE_MAX_256_SIMD) {
                        PMD_INIT_LOG(INFO,
                                "virtio: using packed ring vectorized Rx path 
on port %u",
                                eth_dev->data->port_id);
@@ -1555,7 +1558,8 @@ set_rxtx_funcs(struct rte_eth_dev *eth_dev)
                        eth_dev->rx_pkt_burst = &virtio_recv_pkts_packed;
                }
        } else {
-               if (hw->use_vec_rx) {
+               if (hw->use_vec_rx && rte_get_max_simd_bitwidth()
+                               >= RTE_MAX_128_SIMD) {
                        PMD_INIT_LOG(INFO, "virtio: using vectorized Rx path on 
port %u",
                                eth_dev->data->port_id);
                        eth_dev->rx_pkt_burst = virtio_recv_pkts_vec;
-- 
2.17.1