ieee802154: add wpan_dev_list

This patch adds a wpan_dev_list list into cfg802154_registered_device
struct. Also adding new wpan_dev into this list while
cfg802154_netdev_notifier_call. This behaviour is mostly grab from
wireless core.c implementation and is needed for preparing nl802154
framework.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/include/net/cfg802154.h b/include/net/cfg802154.h
index 7e1bc21..e5570e0 100644 (file)
--- a/include/net/cfg802154.h
+++ b/include/net/cfg802154.h
@@ -66,6 +66,12 @@ struct wpan_dev {
        struct wpan_phy *wpan_phy;
        int iftype;
 
+       /* the remainder of this struct should be private to cfg802154 */
+       struct list_head list;
+       struct net_device *netdev;
+
+       u32 identifier;
+
        /* MAC PIB */
        __le16 pan_id;
        __le16 short_addr;

diff --git a/net/ieee802154/core.c b/net/ieee802154/core.c
index 11a1d2e..3ee00bf 100644 (file)
--- a/net/ieee802154/core.c
+++ b/net/ieee802154/core.c
@@ -102,12 +102,15 @@ wpan_phy_new(const struct cfg802154_ops *ops, size_t priv_size)
 
        mutex_init(&rdev->wpan_phy.pib_lock);
 
+       INIT_LIST_HEAD(&rdev->wpan_dev_list);
        device_initialize(&rdev->wpan_phy.dev);
        dev_set_name(&rdev->wpan_phy.dev, "wpan-phy%d", rdev->wpan_phy_idx);
 
        rdev->wpan_phy.dev.class = &wpan_phy_class;
        rdev->wpan_phy.dev.platform_data = rdev;
 
+       init_waitqueue_head(&rdev->dev_wait);
+
        return &rdev->wpan_phy;
 }
 EXPORT_SYMBOL(wpan_phy_new);
@@ -140,13 +143,18 @@ void wpan_phy_unregister(struct wpan_phy *phy)
 {
        struct cfg802154_registered_device *rdev = wpan_phy_to_rdev(phy);
 
-       /* TODO open count */
+       wait_event(rdev->dev_wait, ({
+               int __count;
+               rtnl_lock();
+               __count = rdev->opencount;
+               rtnl_unlock();
+               __count == 0; }));
 
        rtnl_lock();
        /* TODO nl802154 phy notify */
        /* TODO phy registered lock */
 
-       /* TODO WARN_ON wpan_dev_list */
+       WARN_ON(!list_empty(&rdev->wpan_dev_list));
 
        /* First remove the hardware from everywhere, this makes
         * it impossible to find from userspace.
@@ -173,6 +181,79 @@ void cfg802154_dev_free(struct cfg802154_registered_device *rdev)
        kfree(rdev);
 }
 
+static void
+cfg802154_update_iface_num(struct cfg802154_registered_device *rdev,
+                          int iftype, int num)
+{
+       ASSERT_RTNL();
+
+       rdev->num_running_ifaces += num;
+}
+
+static int cfg802154_netdev_notifier_call(struct notifier_block *nb,
+                                         unsigned long state, void *ptr)
+{
+       struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+       struct wpan_dev *wpan_dev = dev->ieee802154_ptr;
+       struct cfg802154_registered_device *rdev;
+
+       if (!wpan_dev)
+               return NOTIFY_DONE;
+
+       rdev = wpan_phy_to_rdev(wpan_dev->wpan_phy);
+
+       /* TODO WARN_ON unspec type */
+
+       switch (state) {
+               /* TODO NETDEV_DEVTYPE */
+       case NETDEV_REGISTER:
+               wpan_dev->identifier = ++rdev->wpan_dev_id;
+               list_add_rcu(&wpan_dev->list, &rdev->wpan_dev_list);
+               rdev->devlist_generation++;
+
+               wpan_dev->netdev = dev;
+               break;
+       case NETDEV_DOWN:
+               cfg802154_update_iface_num(rdev, wpan_dev->iftype, -1);
+
+               rdev->opencount--;
+               wake_up(&rdev->dev_wait);
+               break;
+       case NETDEV_UP:
+               cfg802154_update_iface_num(rdev, wpan_dev->iftype, 1);
+
+               rdev->opencount++;
+               break;
+       case NETDEV_UNREGISTER:
+               /* It is possible to get NETDEV_UNREGISTER
+                * multiple times. To detect that, check
+                * that the interface is still on the list
+                * of registered interfaces, and only then
+                * remove and clean it up.
+                */
+               if (!list_empty(&wpan_dev->list)) {
+                       list_del_rcu(&wpan_dev->list);
+                       rdev->devlist_generation++;
+               }
+               /* synchronize (so that we won't find this netdev
+                * from other code any more) and then clear the list
+                * head so that the above code can safely check for
+                * !list_empty() to avoid double-cleanup.
+                */
+               synchronize_rcu();
+               INIT_LIST_HEAD(&wpan_dev->list);
+               break;
+       default:
+               return NOTIFY_DONE;
+       }
+
+       return NOTIFY_OK;
+}
+
+static struct notifier_block cfg802154_netdev_notifier = {
+       .notifier_call = cfg802154_netdev_notifier_call,
+};
+
 static int __init wpan_phy_class_init(void)
 {
        int rc;
@@ -181,11 +262,18 @@ static int __init wpan_phy_class_init(void)
        if (rc)
                goto err;
 
-       rc = ieee802154_nl_init();
+       rc = register_netdevice_notifier(&cfg802154_netdev_notifier);
        if (rc)
                goto err_nl;
 
+       rc = ieee802154_nl_init();
+       if (rc)
+               goto err_notifier;
+
        return 0;
+
+err_notifier:
+       unregister_netdevice_notifier(&cfg802154_netdev_notifier);
 err_nl:
        wpan_phy_sysfs_exit();
 err:
@@ -196,6 +284,7 @@ subsys_initcall(wpan_phy_class_init);
 static void __exit wpan_phy_class_exit(void)
 {
        ieee802154_nl_exit();
+       unregister_netdevice_notifier(&cfg802154_netdev_notifier);
        wpan_phy_sysfs_exit();
 }
 module_exit(wpan_phy_class_exit);

diff --git a/net/ieee802154/core.h b/net/ieee802154/core.h
index 38887cb..e708d9d 100644 (file)
--- a/net/ieee802154/core.h
+++ b/net/ieee802154/core.h
@@ -10,6 +10,17 @@ struct cfg802154_registered_device {
        /* wpan_phy index, internal only */
        int wpan_phy_idx;
 
+       /* also protected by devlist_mtx */
+       int opencount;
+       wait_queue_head_t dev_wait;
+
+       /* protected by RTNL only */
+       int num_running_ifaces;
+
+       /* associated wpan interfaces, protected by rtnl or RCU */
+       struct list_head wpan_dev_list;
+       int devlist_generation, wpan_dev_id;
+
        /* must be last because of the way we do wpan_phy_priv(),
         * and it should at least be aligned to NETDEV_ALIGN
         */