netdev-dpdk: Fix RSS configuration for virtio.

In the future, virtio may support RSS.
In any case, it is safer to rely on exposed capabilities rather than
matching on driver names.

Signed-off-by: David Marchand <[email protected]>
Acked-by: Michael Santana <[email protected]>
Reviewed-by: Maxime Coquelin <[email protected]>
Signed-off-by: Ilya Maximets <[email protected]>

lib/netdev-dpdk.c

@@ -961,14 +961,6 @@ dpdk_eth_dev_port_config(struct netdev_dpdk *dev, int n_rxq, int n_txq)
 
     rte_eth_dev_info_get(dev->port_id, &info);
 
-    /* As of DPDK 19.11, it is not allowed to set a mq_mode for
-     * virtio PMD driver. */
-    if (!strcmp(info.driver_name, "net_virtio")) {
-        conf.rxmode.mq_mode = ETH_MQ_RX_NONE;
-    } else {
-        conf.rxmode.mq_mode = ETH_MQ_RX_RSS;
-    }
-
     /* As of DPDK 17.11.1 a few PMDs require to explicitly enable
      * scatter to support jumbo RX.
      * Setting scatter for the device is done after checking for
@@ -1000,6 +992,11 @@ dpdk_eth_dev_port_config(struct netdev_dpdk *dev, int n_rxq, int n_txq)
     /* Limit configured rss hash functions to only those supported
      * by the eth device. */
     conf.rx_adv_conf.rss_conf.rss_hf &= info.flow_type_rss_offloads;
+    if (conf.rx_adv_conf.rss_conf.rss_hf == 0) {
+        conf.rxmode.mq_mode = ETH_MQ_RX_NONE;
+    } else {
+        conf.rxmode.mq_mode = ETH_MQ_RX_RSS;
+    }
 
     /* A device may report more queues than it makes available (this has
      * been observed for Intel xl710, which reserves some of them for