port: force equal queue counts for net_tap and net_virtio

The net_tap and net_virtio drivers require equal RX and TX queue counts.
Set TX queue count to match RX queues for these drivers. This may result
in fewer TX queues than workers, which is now handled by the TX queue
sharing support.

Signed-off-by: Robin Jarry <rjarry@redhat.com>

Author: rjarry

modules/infra/control/port.c

@@ -103,9 +103,12 @@ int port_configure(struct iface_info_port *p, uint16_t n_txq_min) {
 	// cap number of queues to device maximum
 	p->n_txq = RTE_MIN(n_txq_min, info.max_tx_queues);
 
-	if (strcmp(info.driver_name, "net_tap") == 0) {
-		p->n_txq = RTE_MAX(p->n_txq, p->n_rxq);
-		p->n_rxq = p->n_txq;
+	if (strcmp(info.driver_name, "net_tap") == 0
+	    || strcmp(info.driver_name, "net_virtio") == 0) {
+		// force number of TX queues equal to requested RX queues
+		p->n_txq = p->n_rxq;
+		if (p->n_txq > info.max_tx_queues)
+			return errno_set(EOVERFLOW);
 	}
 
 	if (p->n_txq < n_txq_min)