On Wed, Mar 18, 2009 at 08:46:27AM -0400, Mihir Daftari wrote:
> > Hi.. 
> > We have developed a devn driver which can be mounted into io-net.  The 
> > interface shows up fine (dpd0) and generally things seem to work.  But when I 
> > do a netstat -rn I see that a route to lo0 has been added.  
> > 
> > If I assign address 192.168.0.1 to the interface I created..  then the 
> > following line appears in the routing table.  
> > 
> > Destination:         Gateway            Flags       Refs   Use   MTU  
> > Interface
> > 192.168.0.1        192.168.0.1        UH          0        0      -      lo0
> > 
> > 
> > Also, I see my tx_done function (the third function in the 
> > io_net_registrant_funcs_t) gets called when I do ifconfig dpd0 192.168.0.1 
> > 
> > Here is the entire routing table and output of the ifconfig (We also have an 
> > ethernet en1 interface running).  
> > 
> > Destination        Gateway                 Flags     Refs     Use    Mtu  
> > Interface
> > default              77.177.39.1              UG         1        9      -    
> >      en1
> > 127.0.0.1          127.0.0.1                 UH         0        0  33212     
> >  lo0
> > 77.177.39/24      link#3                    UC         1        0      -      
> >     en1
> > 77.177.39.1       00:00:5e:00:01:01   UHLc      1        0      -          en1
> > 
> > 192.168            192.168.0.1             U           0        0      -      
> >     dpd0
> > 192.168.0.1        192.168.0.1            UH        0        0      -         
> >   lo0
> > 
> > lo0: flags=8009<UP,LOOPBACK,MULTICAST> mtu 33212
> >         capabilities=7<IP4CSUM,TCP4CSUM,UDP4CSUM>
> >         enabled=0<>
> >         inet 127.0.0.1 netmask 0xff000000
> > dpd0: flags=c43<UP,BROADCAST,RUNNING,OACTIVE,SIMPLEX> mtu 1500
> >         inet 192.168.0.1 netmask 0xffffff00 broadcast 192.168.0.255
> > en1: flags=8a43<UP,BROADCAST,RUNNING,ALLMULTI,SIMPLEX,MULTICAST> mtu 1500
> >         address: 00:80:c8:3a:96:a2
> >         inet 77.177.39.101 netmask 0xffffff00 broadcast 77.177.39.25
> > 
> 
> 
> I guess I never really put what my question was..   I have two..  
> 1) Why does it add that route?

Are you sure it's happening on ifconfig.  The subnet route
will be created which is this one in your out put above:

192.168    192.168.0.1    U     0    0    - dp0

Is the lo0 one being made on first access? eg when you
ping yourself?

> 2) Why does my tx_done function (the third function in the 
> > io_net_registrant_funcs_t) get called when I do ifconfig ?

Someone must be returning a packet you sent up or you're
calling it yourself (sending up a packet that no one took).

-seanb