int llc_rcv (struct sk_buff * skb, struct net_device * dev, struct packet_type * pt);
When the system receives a 802.2 frame this function is called. It checks SAP and connection of received pdu and passes frame to llc_{station,sap,conn}_rcv for sending to proper state machine. If the frame is related to a busy connection (a connection is sending data now), it queues this frame in the connection's backlog.