mac802154: add mac802154_dev_get_dsn()

Bring-over mac802154_dev_get_dsn() function that was present in the
Linux ZigBee kernel. This function is called by the 6LoWPAN code in
order to properly set the DSN (Data Sequence Number) value in the IEEE
802.15.4 frame.

Signed-off-by: Tony Cheneau <tony.cheneau@amnesiak.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 11 insertions, 0 deletions

diff --git a/net/mac802154/mac802154.h b/net/mac802154/mac802154.h
index a4dcaf1dd4b6..21fa386f4675 100644
--- a/net/mac802154/mac802154.h
+++ b/net/mac802154/mac802154.h
@@ -114,5 +114,6 @@ void mac802154_dev_set_ieee_addr(struct net_device *dev);
 u16 mac802154_dev_get_pan_id(const struct net_device *dev);
 void mac802154_dev_set_pan_id(struct net_device *dev, u16 val);
 void mac802154_dev_set_page_channel(struct net_device *dev, u8 page, u8 chan);
+u8 mac802154_dev_get_dsn(const struct net_device *dev);
 
 #endif /* MAC802154_H */
diff --git a/net/mac802154/mac_cmd.c b/net/mac802154/mac_cmd.c
index d8d277006089..a99910d4d52f 100644
--- a/net/mac802154/mac_cmd.c
+++ b/net/mac802154/mac_cmd.c
@@ -73,4 +73,5 @@ struct ieee802154_mlme_ops mac802154_mlme_wpan = {
         .start_req = mac802154_mlme_start_req,
         .get_pan_id = mac802154_dev_get_pan_id,
         .get_short_addr = mac802154_dev_get_short_addr,
+        .get_dsn = mac802154_dev_get_dsn,
 };
diff --git a/net/mac802154/mib.c b/net/mac802154/mib.c
index f47781ab0ccc..f03e55f2ebf0 100644
--- a/net/mac802154/mib.c
+++ b/net/mac802154/mib.c
@@ -159,6 +159,15 @@ void mac802154_dev_set_pan_id(struct net_device *dev, u16 val)
         }
 }
 
+u8 mac802154_dev_get_dsn(const struct net_device *dev)
+{
+        struct mac802154_sub_if_data *priv = netdev_priv(dev);
+
+        BUG_ON(dev->type != ARPHRD_IEEE802154);
+
+        return priv->dsn++;
+}
+
 static void phy_chan_notify(struct work_struct *work)
 {
         struct phy_chan_notify_work *nw = container_of(work,