ethdev: add missing C++ guards

Some public header files were missing 'extern "C"' C++ guards,
and couldn't be used by C++ applications. Add the missing guards.

Fixes: 7a3f27cbf5 ("ethdev: add access to specific device info")
Fixes: dcd5c8112b ("ethdev: add PCI driver helpers")
Fixes: 7f0a669e7b ("ethdev: add allocation helper for virtual drivers")
Fixes: 7a33572057 ("lib: remove C++ include guard from private headers")
Cc: stable@dpdk.org

Signed-off-by: Brian Dooley <brian.dooley@intel.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Tyler Retzlaff <roretzla@linux.microsoft.com>

lib/ethdev/ethdev_driver.h

@@ -5,6 +5,10 @@
 #ifndef _RTE_ETHDEV_DRIVER_H_
 #define _RTE_ETHDEV_DRIVER_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /**
  * @file
  *
@@ -1881,4 +1885,8 @@ struct rte_eth_tunnel_filter_conf {
 	uint16_t queue_id;      /**< Queue assigned to if match */
 };
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* _RTE_ETHDEV_DRIVER_H_ */

lib/ethdev/ethdev_pci.h

@@ -6,6 +6,10 @@
 #ifndef _RTE_ETHDEV_PCI_H_
 #define _RTE_ETHDEV_PCI_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #include <rte_malloc.h>
 #include <rte_pci.h>
 #include <rte_bus_pci.h>
@@ -171,4 +175,8 @@ rte_eth_dev_pci_generic_remove(struct rte_pci_device *pci_dev,
 	return 0;
 }
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* _RTE_ETHDEV_PCI_H_ */

lib/ethdev/ethdev_vdev.h

@@ -6,6 +6,10 @@
 #ifndef _RTE_ETHDEV_VDEV_H_
 #define _RTE_ETHDEV_VDEV_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #include <rte_config.h>
 #include <rte_malloc.h>
 #include <rte_bus_vdev.h>
@@ -52,4 +56,8 @@ rte_eth_vdev_allocate(struct rte_vdev_device *dev, size_t private_data_size)
 	return eth_dev;
 }
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* _RTE_ETHDEV_VDEV_H_ */

lib/ethdev/rte_dev_info.h

@@ -5,6 +5,10 @@
 #ifndef _RTE_DEV_INFO_H_
 #define _RTE_DEV_INFO_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #include <stdint.h>
 
 /*
@@ -48,4 +52,8 @@ struct rte_eth_dev_module_info {
 #define RTE_ETH_MODULE_SFF_8436_LEN         256
 #define RTE_ETH_MODULE_SFF_8436_MAX_LEN     640
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* _RTE_DEV_INFO_H_ */