mos(4) port

[Juraj Hercek <nbsd%hck.sk@localhost>]

Hello,

I'm trying to port mos(4), USB to Ethernet adapter, driver from OpenBSD 
to NetBSD. I have following issues:

1) Sometimes the whole machine freezes completely when I do "ifconfig 
mos0 up". I compile kernel with LOCKDEBUG and DIAGNOSTIC, but there's no 
message on console... I've found out that when I put/enable some 
DPRINTFN() outputs, the lock up does not occur. I verified all 
spl{net,usb,...}() calls have their splx(s) counterparts... This occurs 
on i386 (single core) as well as amd64 (dual core). Do you have any tips 
what might be the cause of these freezes?

2) If I overcome trouble mentioned in point  (1) above (with couple of 
DPRINTFNs), I have issues with IPv4. After setting an ip address with 
"ifconfig mos0 <ip-address>" (where <ip-address> is any valid IPv4 
address), I'm getting this as a response to "ping <ip-address>" command 
(on i386):
arplookup1: unable to enter address for <ip-address>@40 on null (could 
not allocate llinfo)
arpresolve: can't allocate llinfo on mos0 for <ip-address>

I think the arplookup1 line above is replaced with following line on 
amd64 platform:
arplookup: unable to enter address for <ip-address>@ff on null (could 
not allocate llinfo)

I've seen that "route show" displays <ip-address> instead of "link#<N>" 
in 'Gateway' field. Maybe it's related.

Do you know what might be wrong regarding point (2)?

The IPv6 seems to work fine, ping works, small ssh session over mos0 
device, also  ~ 13MB file transfer worked fine. No stress/extended tests 
were done, however.

Any help in any form is welcome.

-- Juraj