28 struct loopif {  struct
29 	struct ifdev loopif_ifdev;	/* interface device, MUST be first */  argument
30 	struct pbuf *loopif_head;	/* head of pending loopback packets */  argument
31 	struct pbuf **loopif_tailp;	/* tail ptr-ptr of pending packets */  argument
38 #define loopif_get_netif(loopif) (ifdev_get_netif(&(loopif)->loopif_ifdev))  argument
85 	struct loopif *loopif = (struct loopif *)ifdev;  in loopif_poll()  local
154 	struct loopif *loopif = (struct loopif *)ifdev;  in loopif_output()  local
242 	struct loopif *loopif;  in loopif_create()  local
277 	struct loopif *loopif = (struct loopif *)ifdev;  in loopif_destroy()  local
315 	struct loopif *loopif = (struct loopif *)ifdev;  in loopif_set_ifflags()  local
365 	struct loopif *loopif;  in loopif_cksum()  local