mac802154: slaves management support

This patch adds functionality for registration and removing slaves
in the stack.

Signed-off-by: Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 145 insertions, 0 deletions

diff --git a/net/mac802154/ieee802154_dev.c b/net/mac802154/ieee802154_dev.c
index d130271eb528..9f36760b6c3a 100644
--- a/net/mac802154/ieee802154_dev.c
+++ b/net/mac802154/ieee802154_dev.c
@@ -24,12 +24,140 @@
 #include <linux/module.h>
 #include <linux/netdevice.h>
 
+#include <net/netlink.h>
+#include <linux/nl802154.h>
 #include <net/mac802154.h>
 #include <net/route.h>
 #include <net/wpan-phy.h>
 
 #include "mac802154.h"
 
+int mac802154_slave_open(struct net_device *dev)
+{
+        struct mac802154_sub_if_data *priv = netdev_priv(dev);
+        struct mac802154_priv *ipriv = priv->hw;
+        int res = 0;
+
+        if (ipriv->open_count++ == 0) {
+                res = ipriv->ops->start(&ipriv->hw);
+                WARN_ON(res);
+                if (res)
+                        goto err;
+        }
+
+        if (ipriv->ops->ieee_addr) {
+                res = ipriv->ops->ieee_addr(&ipriv->hw, dev->dev_addr);
+                WARN_ON(res);
+                if (res)
+                        goto err;
+                mac802154_dev_set_ieee_addr(dev);
+        }
+
+        netif_start_queue(dev);
+        return 0;
+err:
+        priv->hw->open_count--;
+
+        return res;
+}
+
+int mac802154_slave_close(struct net_device *dev)
+{
+        struct mac802154_sub_if_data *priv = netdev_priv(dev);
+        struct mac802154_priv *ipriv = priv->hw;
+
+        netif_stop_queue(dev);
+
+        if (!--ipriv->open_count)
+                ipriv->ops->stop(&ipriv->hw);
+
+        return 0;
+}
+
+static int
+mac802154_netdev_register(struct wpan_phy *phy, struct net_device *dev)
+{
+        struct mac802154_sub_if_data *priv;
+        struct mac802154_priv *ipriv;
+        int err;
+
+        ipriv = wpan_phy_priv(phy);
+
+        priv = netdev_priv(dev);
+        priv->dev = dev;
+        priv->hw = ipriv;
+
+        dev->needed_headroom = ipriv->hw.extra_tx_headroom;
+
+        SET_NETDEV_DEV(dev, &ipriv->phy->dev);
+
+        mutex_lock(&ipriv->slaves_mtx);
+        if (!ipriv->running) {
+                mutex_unlock(&ipriv->slaves_mtx);
+                return -ENODEV;
+        }
+        mutex_unlock(&ipriv->slaves_mtx);
+
+        err = register_netdev(dev);
+        if (err < 0)
+                return err;
+
+        rtnl_lock();
+        mutex_lock(&ipriv->slaves_mtx);
+        list_add_tail_rcu(&priv->list, &ipriv->slaves);
+        mutex_unlock(&ipriv->slaves_mtx);
+        rtnl_unlock();
+
+        return 0;
+}
+
+static void
+mac802154_del_iface(struct wpan_phy *phy, struct net_device *dev)
+{
+        struct mac802154_sub_if_data *sdata;
+        ASSERT_RTNL();
+
+        sdata = netdev_priv(dev);
+
+        BUG_ON(sdata->hw->phy != phy);
+
+        mutex_lock(&sdata->hw->slaves_mtx);
+        list_del_rcu(&sdata->list);
+        mutex_unlock(&sdata->hw->slaves_mtx);
+
+        synchronize_rcu();
+        unregister_netdevice(sdata->dev);
+}
+
+static struct net_device *
+mac802154_add_iface(struct wpan_phy *phy, const char *name, int type)
+{
+        struct net_device *dev;
+        int err = -ENOMEM;
+
+        /* No devices is currently added */
+        switch (type) {
+        default:
+                dev = NULL;
+                err = -EINVAL;
+                break;
+        }
+        if (!dev)
+                goto err;
+
+        err = mac802154_netdev_register(phy, dev);
+        if (err)
+                goto err_free;
+
+        dev_hold(dev); /* we return an incremented device refcount */
+        return dev;
+
+err_free:
+        free_netdev(dev);
+err:
+        return ERR_PTR(err);
+}
+
 struct ieee802154_dev *
 ieee802154_alloc_device(size_t priv_data_len, struct ieee802154_ops *ops)
 {
@@ -87,6 +215,8 @@ void ieee802154_free_device(struct ieee802154_dev *hw)
 {
         struct mac802154_priv *priv = mac802154_to_priv(hw);
 
+        BUG_ON(!list_empty(&priv->slaves));
+
         wpan_phy_free(priv->phy);
 
         mutex_destroy(&priv->slaves_mtx);
@@ -105,6 +235,9 @@ int ieee802154_register_device(struct ieee802154_dev *dev)
 
         wpan_phy_set_dev(priv->phy, priv->hw.parent);
 
+        priv->phy->add_iface = mac802154_add_iface;
+        priv->phy->del_iface = mac802154_del_iface;
+
         rc = wpan_phy_register(priv->phy);
         if (rc < 0)
                 goto out_wq;
@@ -129,6 +262,7 @@ EXPORT_SYMBOL(ieee802154_register_device);
 void ieee802154_unregister_device(struct ieee802154_dev *dev)
 {
         struct mac802154_priv *priv = mac802154_to_priv(dev);
+        struct mac802154_sub_if_data *sdata, *next;
 
         flush_workqueue(priv->dev_workqueue);
         destroy_workqueue(priv->dev_workqueue);
@@ -139,6 +273,14 @@ void ieee802154_unregister_device(struct ieee802154_dev *dev)
         priv->running = MAC802154_DEVICE_STOPPED;
         mutex_unlock(&priv->slaves_mtx);
 
+        list_for_each_entry_safe(sdata, next, &priv->slaves, list) {
+                mutex_lock(&sdata->hw->slaves_mtx);
+                list_del(&sdata->list);
+                mutex_unlock(&sdata->hw->slaves_mtx);
+
+                unregister_netdevice(sdata->dev);
+        }
+
         rtnl_unlock();
 
         wpan_phy_unregister(priv->phy);
diff --git a/net/mac802154/mac802154.h b/net/mac802154/mac802154.h
index 7d9a0d4a99fd..622752622c87 100644
--- a/net/mac802154/mac802154.h
+++ b/net/mac802154/mac802154.h
@@ -92,6 +92,9 @@ struct mac802154_sub_if_data {
 
 extern struct ieee802154_reduced_mlme_ops mac802154_mlme_reduced;
 
+int mac802154_slave_open(struct net_device *dev);
+int mac802154_slave_close(struct net_device *dev);
+
 netdev_tx_t mac802154_tx(struct mac802154_priv *priv, struct sk_buff *skb,
                          u8 page, u8 chan);