net: vlan: prepare for 802.1ad support

Make the encapsulation protocol value a property of VLAN devices and change
the device lookup functions to take the protocol value into account.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 45 insertions, 9 deletions

diff --git a/net/8021q/vlan.h b/net/8021q/vlan.h
index 670f1e8cfc0f..245de9653db0 100644
--- a/net/8021q/vlan.h
+++ b/net/8021q/vlan.h
@@ -49,6 +49,7 @@ struct netpoll;
  *      @ingress_priority_map: ingress priority mappings
  *      @nr_egress_mappings: number of egress priority mappings
  *      @egress_priority_map: hash of egress priority mappings
+ *      @vlan_proto: VLAN encapsulation protocol
  *      @vlan_id: VLAN identifier
  *      @flags: device flags
  *      @real_dev: underlying netdevice
@@ -62,6 +63,7 @@ struct vlan_dev_priv {
         unsigned int                            nr_egress_mappings;
         struct vlan_priority_tci_mapping        *egress_priority_map[16];
 
+        __be16                                  vlan_proto;
         u16                                     vlan_id;
         u16                                     flags;
 
@@ -87,10 +89,16 @@ static inline struct vlan_dev_priv *vlan_dev_priv(const struct net_device *dev)
 #define VLAN_GROUP_ARRAY_SPLIT_PARTS  8
 #define VLAN_GROUP_ARRAY_PART_LEN     (VLAN_N_VID/VLAN_GROUP_ARRAY_SPLIT_PARTS)
 
+enum vlan_protos {
+        VLAN_PROTO_8021Q        = 0,
+        VLAN_PROTO_NUM,
+};
+
 struct vlan_group {
         unsigned int            nr_vlan_devs;
         struct hlist_node       hlist;  /* linked list */
-        struct net_device **vlan_devices_arrays[VLAN_GROUP_ARRAY_SPLIT_PARTS];
+        struct net_device **vlan_devices_arrays[VLAN_PROTO_NUM]
+                                               [VLAN_GROUP_ARRAY_SPLIT_PARTS];
 };
 
 struct vlan_info {
@@ -103,37 +111,64 @@ struct vlan_info {
         struct rcu_head         rcu;
 };
 
-static inline struct net_device *vlan_group_get_device(struct vlan_group *vg,
-                                                       u16 vlan_id)
+static inline unsigned int vlan_proto_idx(__be16 proto)
+{
+        switch (proto) {
+        case __constant_htons(ETH_P_8021Q):
+                return VLAN_PROTO_8021Q;
+        default:
+                BUG();
+        }
+}
+
+static inline struct net_device *__vlan_group_get_device(struct vlan_group *vg,
+                                                         unsigned int pidx,
+                                                         u16 vlan_id)
 {
         struct net_device **array;
-        array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
+
+        array = vg->vlan_devices_arrays[pidx]
+                                       [vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
         return array ? array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] : NULL;
 }
 
+static inline struct net_device *vlan_group_get_device(struct vlan_group *vg,
+                                                       __be16 vlan_proto,
+                                                       u16 vlan_id)
+{
+        return __vlan_group_get_device(vg, vlan_proto_idx(vlan_proto), vlan_id);
+}
+
 static inline void vlan_group_set_device(struct vlan_group *vg,
-                                         u16 vlan_id,
+                                         __be16 vlan_proto, u16 vlan_id,
                                          struct net_device *dev)
 {
         struct net_device **array;
         if (!vg)
                 return;
-        array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
+        array = vg->vlan_devices_arrays[vlan_proto_idx(vlan_proto)]
+                                       [vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
         array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] = dev;
 }
 
 /* Must be invoked with rcu_read_lock or with RTNL. */
 static inline struct net_device *vlan_find_dev(struct net_device *real_dev,
-                                               u16 vlan_id)
+                                               __be16 vlan_proto, u16 vlan_id)
 {
         struct vlan_info *vlan_info = rcu_dereference_rtnl(real_dev->vlan_info);
 
         if (vlan_info)
-                return vlan_group_get_device(&vlan_info->grp, vlan_id);
+                return vlan_group_get_device(&vlan_info->grp,
+                                             vlan_proto, vlan_id);
 
         return NULL;
 }
 
+#define vlan_group_for_each_dev(grp, i, dev) \
+        for ((i) = 0; i < VLAN_PROTO_NUM * VLAN_N_VID; i++) \
+                if (((dev) = __vlan_group_get_device((grp), (i) / VLAN_N_VID, \
+                                                            (i) % VLAN_N_VID)))
+
 /* found in vlan_dev.c */
 void vlan_dev_set_ingress_priority(const struct net_device *dev,
                                    u32 skb_prio, u16 vlan_prio);
@@ -142,7 +177,8 @@ int vlan_dev_set_egress_priority(const struct net_device *dev,
 int vlan_dev_change_flags(const struct net_device *dev, u32 flag, u32 mask);
 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result);
 
-int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id);
+int vlan_check_real_dev(struct net_device *real_dev,
+                        __be16 protocol, u16 vlan_id);
 void vlan_setup(struct net_device *dev);
 int register_vlan_dev(struct net_device *dev);
 void unregister_vlan_dev(struct net_device *dev, struct list_head *head);