ethdev: add internal reset function

This is a helper for DPDK internal users to force a reconfiguration of a
device.

Signed-off-by: Jan Blunck <jblunck@infradead.org>

lib/librte_ether/rte_ethdev.c

@@ -856,6 +856,22 @@ rte_eth_dev_configure(uint8_t port_id, uint16_t nb_rx_q, uint16_t nb_tx_q,
 	return 0;
 }
 
+void
+_rte_eth_dev_reset(struct rte_eth_dev *dev)
+{
+	if (dev->data->dev_started) {
+		RTE_PMD_DEBUG_TRACE(
+			"port %d must be stopped to allow reset\n",
+			dev->data->port_id);
+		return;
+	}
+
+	rte_eth_dev_rx_queue_config(dev, 0);
+	rte_eth_dev_tx_queue_config(dev, 0);
+
+	memset(&dev->data->dev_conf, 0, sizeof(dev->data->dev_conf));
+}
+
 static void
 rte_eth_dev_config_restore(uint8_t port_id)
 {

lib/librte_ether/rte_ethdev.h

@@ -1913,6 +1913,19 @@ uint32_t rte_eth_speed_bitflag(uint32_t speed, int duplex);
 int rte_eth_dev_configure(uint8_t port_id, uint16_t nb_rx_queue,
 		uint16_t nb_tx_queue, const struct rte_eth_conf *eth_conf);
 
+/**
+ * @internal
+ * Release device queues and clear its configuration to force the user
+ * application to reconfigure it. It is for internal use only.
+ *
+ * @param dev
+ *  Pointer to struct rte_eth_dev.
+ *
+ * @return
+ *  void
+ */
+void _rte_eth_dev_reset(struct rte_eth_dev *dev);
+
 /**
  * Allocate and set up a receive queue for an Ethernet device.
  *

lib/librte_ether/rte_ether_version.map

@@ -147,3 +147,10 @@ DPDK_16.11 {
 	rte_eth_dev_pci_remove;
 
 } DPDK_16.07;
+
+DPDK_17.02 {
+	global:
+
+	_rte_eth_dev_reset;
+
+} DPDK_16.11;