Add an API to reset the device.
It's for VF device in this scenario, kernel PF + DPDK VF.
When the PF port down/up, APP should call this API to
reset VF port. Most likely, APP should call it in its
management thread and guarantee the thread safe.

Signed-off-by: Wenzhuo Lu <wenzhuo.lu at intel.com>
---
 lib/librte_ether/rte_ethdev.c          | 17 +++++++++++++++++
 lib/librte_ether/rte_ethdev.h          | 14 ++++++++++++++
 lib/librte_ether/rte_ether_version.map |  7 +++++++
 3 files changed, 38 insertions(+)

diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
index e148028..e43dca9 100644
--- a/lib/librte_ether/rte_ethdev.c
+++ b/lib/librte_ether/rte_ethdev.c
@@ -3346,3 +3346,20 @@ rte_eth_dev_l2_tunnel_offload_set(uint8_t port_id,
                                -ENOTSUP);
        return (*dev->dev_ops->l2_tunnel_offload_set)(dev, l2_tunnel, mask, en);
 }
+
+int
+rte_eth_dev_reset(uint8_t port_id)
+{
+       struct rte_eth_dev *dev;
+       int diag;
+
+       RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -EINVAL);
+
+       dev = &rte_eth_devices[port_id];
+
+       RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->dev_reset, -ENOTSUP);
+
+       diag = (*dev->dev_ops->dev_reset)(dev);
+
+       return diag;
+}
diff --git a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h
index 2757510..74e895f 100644
--- a/lib/librte_ether/rte_ethdev.h
+++ b/lib/librte_ether/rte_ethdev.h
@@ -1318,6 +1318,9 @@ typedef int (*eth_l2_tunnel_offload_set_t)
         uint8_t en);
 /**< @internal enable/disable the l2 tunnel offload functions */

+typedef int  (*eth_dev_reset_t)(struct rte_eth_dev *dev);
+/**< @internal Function used to reset a configured Ethernet device. */
+
 #ifdef RTE_NIC_BYPASS

 enum {
@@ -1508,6 +1511,8 @@ struct eth_dev_ops {
        eth_l2_tunnel_eth_type_conf_t l2_tunnel_eth_type_conf;
        /** Enable/disable l2 tunnel offload functions */
        eth_l2_tunnel_offload_set_t l2_tunnel_offload_set;
+       /** Reset device. */
+       eth_dev_reset_t dev_reset;
 };

 /**
@@ -4253,6 +4258,15 @@ rte_eth_dev_l2_tunnel_offload_set(uint8_t port_id,
                                  uint32_t mask,
                                  uint8_t en);

+/**
+ * Reset an Ethernet device.
+ *
+ * @param port_id
+ *   The port identifier of the Ethernet device.
+ */
+int
+rte_eth_dev_reset(uint8_t port_id);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/librte_ether/rte_ether_version.map 
b/lib/librte_ether/rte_ether_version.map
index 214ecc7..c34207e 100644
--- a/lib/librte_ether/rte_ether_version.map
+++ b/lib/librte_ether/rte_ether_version.map
@@ -132,3 +132,10 @@ DPDK_16.04 {
        rte_eth_tx_buffer_set_err_callback;

 } DPDK_2.2;
+
+DPDK_16.07 {
+       global:
+
+       rte_eth_dev_reset;
+
+} DPDK_16.04;
-- 
2.1.4

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