+ rename and document an unused field in struct arpcom (field is still

  there so there are no ABI changes);
+ replace 5 redefinitions of the IPF2AC macro with one in if_arp.h

Eventually (but before freezing the ABI) we need to get rid of
struct arpcom (initially with the help of some smart #defines
to avoid having to touch each and every driver, see below).

Apart from the struct ifnet, struct arpcom now only stores a copy
of the MAC address (ac_enaddr, but we already have another copy in
the struct ifnet -- if_addrhead), and a netgraph-specific field
which is _always_ accessed through the ifp, so it might well go
into the struct ifnet too (where, besides, there is already an entry
for AF_NETGRAPH data...)

Too bad ac_enaddr is widely referenced by all drivers. But
this can be fixed as follows:

#define ac_enaddr       ac_if.the_original_ac_enaddr_in_struct_ifnet

(note that the right hand side would likely be a pointer rather than
the base address of an array.)

1 files changed, 0 insertions, 1 deletions

diff --git a/sys/net/if_fddisubr.c b/sys/net/if_fddisubr.c
index 1003208..2e89840 100644
--- a/sys/net/if_fddisubr.c
+++ b/sys/net/if_fddisubr.c
@@ -98,7 +98,6 @@ static int fddi_output(struct ifnet *, struct mbuf *, struct sockaddr *,
 		       struct rtentry *); 
 static void fddi_input(struct ifnet *ifp, struct mbuf *m);
 
-#define	IFP2AC(IFP)	((struct arpcom *)IFP)
 #define	senderr(e)	do { error = (e); goto bad; } while (0)
 
 /*