[ofw] RE: more info on kernel winverbs interface

[Leonid Keller]

The long term goal IMO is to replace IBAL by more effective and
maintainable code.
Of course, WinVerbs kernel interface should be defined so as to decrease
the pain of porting of ULPs (IPoIB, IOU, SRP, SDP, ?WSD, netvnic et al).
A suboptimal, but first solution here would be a filter driver that
converts IBAL i/f to Winverbs one.


> -----Original Message-----
> From: ofw-bounces at lists.openfabrics.org 
> [mailto:ofw-bounces at lists.openfabrics.org] On Behalf Of Sean Hefty
> Sent: Thursday, April 30, 2009 2:50 AM
> To: ofw at lists.openfabrics.org
> Subject: [ofw] RE: more info on kernel winverbs interface
> 
> >The idea of having a winverbs kernel interface was brought up at the 
> >last WWG call.  I just wanted to get more information on the request.
> 
> I haven't seen any feedback on the mail list for this, and 
> I'd like to understand the long term goal and users better 
> before spending too much time on this.
> 
> It should be possible to provide a kernel level winverbs 
> interface.  Such an interface would be derived from the 
> userspace winverbs interface, but using the winsock kernel 
> interface as a guide.  Support for 'verbs' only calls is 
> probably doable within a WinOF 2.2 timeframe.  Support for CM 
> related calls would take longer.
> 
> I'm not sure, but I think the IWVProvider interfaces would be 
> eliminated in the kernel.  All calls would be bound to a 
> specific device.  This means that kernel level RDMA CM 
> support would differ from userspace or Linux in that wildcard 
> listens would not be directly supported.
> 
> - Sean
> 
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