batman-adv: change VID semantic in the BLA code

In order to make batman-adv fully vlan aware later, the
semantic used for variables storing the VLAN ID values has
to be changed in order to be adapted to the new one which
will be used batman-adv wide.

In particular, the VID has to be an "_unsigned_ short int"
and its 4 MSB will be used as a flag bitfield, while the
remaining 12 bits are used to store the real VID value

Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Acked-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>

1 files changed, 11 insertions, 0 deletions

diff --git a/net/batman-adv/main.h b/net/batman-adv/main.h
index ea1a3bafe9c3..6f25ef29f305 100644
--- a/net/batman-adv/main.h
+++ b/net/batman-adv/main.h
@@ -162,6 +162,17 @@ enum batadv_uev_type {
 #include <linux/seq_file.h>
 #include "types.h"
 
+/**
+ * batadv_vlan_flags - flags for the four MSB of any vlan ID field
+ * @BATADV_VLAN_HAS_TAG: whether the field contains a valid vlan tag or not
+ */
+enum batadv_vlan_flags {
+	BATADV_VLAN_HAS_TAG	= BIT(15),
+};
+
+#define BATADV_PRINT_VID(vid) (vid & BATADV_VLAN_HAS_TAG ? \
+			       (int)(vid & VLAN_VID_MASK) : -1)
+
 extern char batadv_routing_algo[];
 extern struct list_head batadv_hardif_list;