// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2007-2012 Nicira, Inc.
 */

#include <linux/netdevice.h>
#include <net/genetlink.h>
#include <net/netns/generic.h>

#include "datapath.h"
#include "vport-internal_dev.h"
#include "vport-netdev.h"

static void dp_detach_port_notify(struct vport *vport)
{
        struct sk_buff *notify;
        struct datapath *dp;

        dp = vport->dp;
        notify = ovs_vport_cmd_build_info(vport, ovs_dp_get_net(dp),
                                          0, 0, OVS_VPORT_CMD_DEL);
        ovs_dp_detach_port(vport);
        if (IS_ERR(notify)) {
                genl_set_err(&dp_vport_genl_family, ovs_dp_get_net(dp), 0,
                             0, PTR_ERR(notify));
                return;
        }

        genlmsg_multicast_netns(&dp_vport_genl_family,
                                ovs_dp_get_net(dp), notify, 0,
                                0, GFP_KERNEL);
}

void ovs_dp_notify_wq(struct work_struct *work)
{
        struct ovs_net *ovs_net = container_of(work, struct ovs_net, dp_notify_work);
        struct datapath *dp;

        ovs_lock();
        list_for_each_entry(dp, &ovs_net->dps, list_node) {
                int i;

                for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
                        struct vport *vport;
                        struct hlist_node *n;

                        hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) {
                                if (vport->ops->type == OVS_VPORT_TYPE_INTERNAL)
                                        continue;

                                if (!(netif_is_ovs_port(vport->dev)))
                                        dp_detach_port_notify(vport);
                        }
                }
        }
        ovs_unlock();
}

static int dp_device_event(struct notifier_block *unused, unsigned long event,
                           void *ptr)
{
        struct ovs_net *ovs_net;
        struct net_device *dev = netdev_notifier_info_to_dev(ptr);
        struct vport *vport = NULL;

        if (!ovs_is_internal_dev(dev))
                vport = ovs_netdev_get_vport(dev);

        if (!vport)
                return NOTIFY_DONE;

        if (event == NETDEV_UNREGISTER) {
                /* upper_dev_unlink and decrement promisc immediately */
                ovs_netdev_detach_dev(vport);

                /* schedule vport destroy, dev_put and genl notification */
                ovs_net = net_generic(dev_net(dev), ovs_net_id);
                queue_work(system_percpu_wq, &ovs_net->dp_notify_work);
        }

        return NOTIFY_DONE;
}

struct notifier_block ovs_dp_device_notifier = {
        .notifier_call = dp_device_event
};