[RFC netifd 2/3] vlan: add pass-through hotplug ops that pass the VLAN info to the bridge

[Felix Fietkau]

Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 vlan.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)

diff --git a/vlan.c b/vlan.c
index 6270d95d755d..7d37fef33e2f 100644
--- a/vlan.c
+++ b/vlan.c
@@ -18,6 +18,8 @@
 #include "netifd.h"
 #include "system.h"
 
+static struct blob_buf b;
+
 struct vlan_device {
 	struct device dev;
 	struct device_user dep;
@@ -36,6 +38,66 @@ static void free_vlan_if(struct device *iface)
 	free(vldev);
 }
 
+static int
+vlan_hotplug_add(struct device *dev, struct device *member, struct blob_attr *vlan)
+{
+	struct vlan_device *vldev = container_of(dev, struct vlan_device, dev);
+	void *a;
+
+	dev = vldev->dep.dev;
+	if (!dev || !dev->hotplug_ops)
+		return UBUS_STATUS_NOT_SUPPORTED;
+
+	blob_buf_init(&b, 0);
+	a = blobmsg_open_array(&b, "vlans");
+	blobmsg_printf(&b, NULL, "%d", vldev->id);
+	blobmsg_close_array(&b, a);
+
+	return dev->hotplug_ops->add(dev, member, blobmsg_data(b.head));
+}
+
+static int
+vlan_hotplug_del(struct device *dev, struct device *member)
+{
+	struct vlan_device *vldev = container_of(dev, struct vlan_device, dev);
+
+	dev = vldev->dep.dev;
+	if (!dev || !dev->hotplug_ops)
+		return UBUS_STATUS_NOT_SUPPORTED;
+
+	return dev->hotplug_ops->del(dev, member);
+}
+
+static int
+vlan_hotplug_prepare(struct device *dev)
+{
+	struct vlan_device *vldev = container_of(dev, struct vlan_device, dev);
+
+	dev = vldev->dep.dev;
+	if (!dev || !dev->hotplug_ops)
+		return UBUS_STATUS_NOT_SUPPORTED;
+
+	return dev->hotplug_ops->prepare(dev);
+}
+
+static void vlan_hotplug_check(struct vlan_device *vldev)
+{
+	static const struct device_hotplug_ops hotplug_ops = {
+		.prepare = vlan_hotplug_prepare,
+		.add = vlan_hotplug_add,
+		.del = vlan_hotplug_del
+	};
+	struct device *dev = vldev->dep.dev;
+
+	if (!dev || !dev->hotplug_ops || avl_is_empty(&dev->vlans.avl)) {
+		vldev->dev.hotplug_ops = NULL;
+		return;
+	}
+
+	vldev->dev.hotplug_ops = &hotplug_ops;
+}
+
+
 static int vlan_set_device_state(struct device *dev, bool up)
 {
 	struct vlan_device *vldev;
@@ -75,6 +137,7 @@ static void vlan_dev_cb(struct device_user *dep, enum device_event ev)
 		device_set_present(&vldev->dev, false);
 		break;
 	case DEV_EVENT_UPDATE_IFNAME:
+		vlan_hotplug_check(vldev);
 		vldev->dev.hidden = dep->dev->hidden;
 		if (snprintf(name, sizeof(name), "%s.%d", dep->dev->ifname,
 			     vldev->id) >= sizeof(name) - 1 ||
@@ -139,6 +202,7 @@ static struct device *get_vlan_device(struct device *dev, int id, bool create)
 
 	vldev->dep.cb = vlan_dev_cb;
 	device_add_user(&vldev->dep, dev);
+	vlan_hotplug_check(vldev);
 
 	return &vldev->dev;
 
-- 
2.28.0