arp rewrite...

Julian Elischer julian at
Tue Dec 11 10:30:13 PST 2007

Julian Elischer wrote:
> Li, Qing wrote:
>>     Last time when I sent an email to net@ for comments, I
>>     received only limited feedback.
>>     The New ARP code in my home directory on FreeFall and was 
>>     lasted updated on June-8-2007. It was based on then     CURRENT 
>> (7.0) and was tested to be working fine at
>>     that time. A bit more work would be necessary in locking
>>     though. I asked for code review and folks to play     with it. 
>> Again, the feedback was really scant.
>>     The code is accessible at
>>     The question I asked then was "should I move forward?"
>>     I'd be more that happy to resume and be done with it.
> I think that breaking the arp code from the routing code
> need to proceed.
> I see no reason to not have reference counted links from the routes to 
> the arp code (for optimisation and compat reasons),
> but it should be self standing.
> I'll look at what you have..

it looks very good.

(could do with a few more comments :-)

What I'm trying to do in my current project is add limited support for multiple
routing tables into 6.x or at latest 7.x

I have a 'low impact' version that gives "limited" support.
    (userland utility not in p4 yet)
i.e. you can select from a small number (defined at compile time)
of tables for ipv4 only.. it will do for my purposes, but should have little
impact on the API/ABI. in -current the requirement for ABI compatibility
is not there so I can do proper rewrite. Which I think would include
a rewrite of the arp code. I like what I see in the code you have done..

It's a bit hard reading you code as patches, is it in P4?

>>     -- Qing
>>> -----Original Message-----
>>> From: owner-freebsd-net at 
>>> [mailto:owner-freebsd-net at] On Behalf Of Luigi Rizzo
>>> Sent: Tuesday, December 11, 2007 12:49 AM
>>> To: Julian Elischer; ales.cerri at
>>> Cc: FreeBSD Net
>>> Subject: Re: arp rewrite...
>>> On Tue, Dec 11, 2007 at 12:37:25AM -0800, Julian Elischer wrote:
>>>> I believe Qing-li (Sp?) did an arp rewrite..
>>> the story is a bit longer - Andre drafted the initial design, which i 
>>> subsequently took over and with a student, Alessandro Cerri, (I am 
>>> Cc-ing him) did a first implementation. This was probably around 2003.
>>> Then Qing-li (Sp?) took over development of that code - last i heard 
>>> of the code was around last summer.
>>> I think our code at least was based on 4.x so it probably did not 
>>> address locking very much (not sure how the routing code is locked 
>>> these days, anyways).
>>> Alessandro is actually around again playing with FreeBSD so he may 
>>> remember more details (it was his thesis, after all!)
>>> cheers
>>> luigi
>>> _______________________________________________
>>> freebsd-net at mailing list
>>> To unsubscribe, send any mail to "freebsd-net-unsubscribe at"
> _______________________________________________
> freebsd-net at mailing list
> To unsubscribe, send any mail to "freebsd-net-unsubscribe at"

More information about the freebsd-net mailing list