RDMA/core: Implement RoCE GID port rescan and export delete function

rdma_roce_rescan_port() scans all network devices in
the system and adds the gids if relevant to the RoCE device
port. When not in bonding mode it adds the GIDs of the
netdevice in this port. When in bonding mode it adds the
GIDs of both the port's netdevice and the bond master
netdevice.

Export roce_del_all_netdev_gids(), which removes all GIDs
associated with a specific netdevice for a given port.

Signed-off-by: Chiara Meiohas <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Leon Romanovsky <[e-mail]>

drivers/infiniband/core/roce_gid_mgmt.c

···
 }
 EXPORT_SYMBOL(rdma_roce_rescan_device);
 
+/**
+ * rdma_roce_rescan_port - Rescan all of the network devices in the system
+ * and add their gids if relevant to the port of the RoCE device.
+ *
+ * @ib_dev: IB device
+ * @port: Port number
+ */
+void rdma_roce_rescan_port(struct ib_device *ib_dev, u32 port)
+{
+	struct net_device *ndev = NULL;
+
+	if (rdma_protocol_roce(ib_dev, port)) {
+		ndev = ib_device_get_netdev(ib_dev, port);
+		if (!ndev)
+			return;
+		enum_all_gids_of_dev_cb(ib_dev, port, ndev, ndev);
+		dev_put(ndev);
+	}
+}
+EXPORT_SYMBOL(rdma_roce_rescan_port);
+
 static void callback_for_addr_gid_device_scan(struct ib_device *device,
 					      u32 port,
 					      struct net_device *rdma_ndev,
···
 	}
 }
 
-static void _roce_del_all_netdev_gids(struct ib_device *ib_dev, u32 port,
-				      struct net_device *event_ndev)
+void roce_del_all_netdev_gids(struct ib_device *ib_dev,
+			      u32 port, struct net_device *ndev)
 {
-	ib_cache_gid_del_all_netdev_gids(ib_dev, port, event_ndev);
+	ib_cache_gid_del_all_netdev_gids(ib_dev, port, ndev);
 }
+EXPORT_SYMBOL(roce_del_all_netdev_gids);
 
 static void del_netdev_upper_ips(struct ib_device *ib_dev, u32 port,
 				 struct net_device *rdma_ndev, void *cookie)
 {
-	handle_netdev_upper(ib_dev, port, cookie, _roce_del_all_netdev_gids);
+	handle_netdev_upper(ib_dev, port, cookie, roce_del_all_netdev_gids);
 }
 
 static void add_netdev_upper_ips(struct ib_device *ib_dev, u32 port,

include/rdma/ib_verbs.h

···
  * @device:         the rdma device
  */
 void rdma_roce_rescan_device(struct ib_device *ibdev);
+void rdma_roce_rescan_port(struct ib_device *ib_dev, u32 port);
+void roce_del_all_netdev_gids(struct ib_device *ib_dev,
+			      u32 port, struct net_device *ndev);
 
 struct ib_ucontext *ib_uverbs_get_ucontext_file(struct ib_uverbs_file *ufile);