Re: [RFC 11/12] 6lowpan: add support for getting short address

In case of sending RA messages we need some way to get the short address
from an 802.15.4 6LoWPAN interface. This patch will add a temporary
debugfs entry for experimental userspace api.

Signed-off-by: Alexander Aring<redacted>
---
  net/6lowpan/debugfs.c | 35 +++++++++++++++++++++++++++++++++++
  1 file changed, 35 insertions(+)

diff --git a/net/6lowpan/debugfs.c b/net/6lowpan/debugfs.c
index acbaa3d..638ae59 100644
--- a/net/6lowpan/debugfs.c
+++ b/net/6lowpan/debugfs.c

@@ -245,6 +245,37 @@ static const struct file_operations lowpan_context_fops = {
  	.release	= single_release,
  };
  
+static int lowpan_short_addr_get(void *data, u64 *val)
+{
+	struct wpan_dev *wdev = data;
+
+	rtnl_lock();
+	*val = le16_to_cpu(wdev->short_addr);
+	rtnl_unlock();
+
+	return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(lowpan_short_addr_fops, lowpan_short_addr_get,
+			NULL, "0x%04llx\n");
+
+static int lowpan_dev_debugfs_802154_init(const struct net_device *dev,
+					  struct lowpan_dev *ldev)
+{
+	struct dentry *dentry;
+
+	if (!lowpan_is_ll(dev, LOWPAN_LLTYPE_IEEE802154))
+		return 0;
+
+	dentry = debugfs_create_file("short_addr", 0444, ldev->iface_debugfs,
+				     lowpan_802154_dev(dev)->wdev->ieee802154_ptr,
+				     &lowpan_short_addr_fops);
+	if (!dentry)
+		return -EINVAL;
+
+	return 0;
+}
+
  int lowpan_dev_debugfs_init(struct net_device *dev)
  {
  	struct lowpan_dev *ldev = lowpan_dev(dev);

@@ -272,6 +303,10 @@ int lowpan_dev_debugfs_init(struct net_device *dev)
  			goto remove_root;
  	}
  
+	ret = lowpan_dev_debugfs_802154_init(dev, ldev);
+	if (ret < 0)
+		goto remove_root;
+
  	return 0;
  
  remove_root: