+/* Pass the DL packet to the netif layer. */
+static int mux_net_receive(struct iosm_mux *ipc_mux, int if_id,
+			   struct iosm_wwan *wwan, u32 offset, u8 service_class,
+			   struct sk_buff *skb)
+{
+	/* for "zero copy" use clone */
+	struct sk_buff *dest_skb = skb_clone(skb, GFP_ATOMIC);
+
+	if (!dest_skb)
+		return -1;
+
+	skb_pull(dest_skb, offset);
+
+	skb_set_tail_pointer(dest_skb, dest_skb->len);
+
+	/* Goto the start of the Ethernet header. */
+	skb_push(dest_skb, ETH_HLEN);
+
+	/* map session to vlan */
+	__vlan_hwaccel_put_tag(dest_skb, htons(ETH_P_8021Q), if_id + 1);

Well, that explains a bit, my comments on the netdev patch. So there
is no Ethernet header on the 'wire'. This is not an Ethernet device at
all.

More in the documentation patch...

	Andrew