[ofw] udapl for windows

[Fab Tillier]

The SendArp function sends an ARP request every time it is invoked.  It doesn't actually lookup the system's ARP cache.  Using SendArp was tried with WSD and found to give significantly worse connection establishment rates (~50%) than doing the ATS query to the SA, which is why WSD still uses ATS.  I suppose the ATS query rate depends on the SM.

-Fab

-----Original Message-----
From: ofw-bounces at lists.openfabrics.org [mailto:ofw-bounces at lists.openfabrics.org] On Behalf Of Tzachi Dar
Sent: Monday, December 10, 2007 1:06 PM
To: Sean Hefty; Davis, Arlin R; Gabor Forgacs; ofw at lists.openfabrics.org
Subject: RE: [ofw] udapl for windows

Is there any reason why the windows implementation will not use Arp for
the
IP -> GID mapping?

This code looks trivial.

Thanks
Tzachi

> -----Original Message-----
> From: ofw-bounces at lists.openfabrics.org
> [mailto:ofw-bounces at lists.openfabrics.org] On Behalf Of Sean Hefty
> Sent: Monday, December 10, 2007 8:48 PM
> To: Davis, Arlin R; 'Gabor Forgacs'; ofw at lists.openfabrics.org
> Subject: RE: [ofw] udapl for windows
>
> >Well, without rdma_cm in WinOF I have few options. Does
> someone wish to
> >commit to rdma_cm in WinOF by next release? Are you volunteering?
>
> This is a question of how much proprietary protocol uDAPL
> needs to define.
>
> The RDMA CM provides IP -> GID mapping, path record lookup,
> and connection establishment.  There's not a strict
> requirement on how the IP -> GID mapping is obtained.  Linux
> uses ARP, but Windows could config files, ATS, or exchange
> that data using a service running over sockets.  (I've been
> thinking about the latter as a solution to working across IB
> routers.)  uDAPL could use the same PR lookup and IB CM
> mechanisms that it uses today.  The only requirement is that
> the private data and SID should match a specific format.



> I don't know if the Windows IB CM allows matching connections
> based on private data content or operates only on the SID, so
> there may be different restrictions between Linux and Windows
> trying to simulate listening on specific IP addresses.
>
> - Sean
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