RE: rdma-core in Dabian

["Steve Wise" <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>]

> From: Jason Gunthorpe [mailto:jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org]
> 
> On Wed, May 10, 2017 at 07:02:01PM +0300, Leon Romanovsky wrote:
> 
> > > I've been thinking we should patch the kernel to solve this problem
> > > instead of using this ugly userspace solution.
> >
> > Can it be related to the fact that mlx5 core calls to
> > request_module_nowait for mlx5_ib and chelsio doesn't do it?
> 
> Yeah, maybe we should update chelsio kernel drivers instead of using
> these strange modprobe files...
> 
> Steve?

Under what criteria would cxgb4 want to request its Upper Layer Drivers (ULDs)
to be loaded?  You wouldn't want to load the iwarp and iscsi drivers if they
aren't going to be used, would you?



> 
> > > Maybe Leon's team will try to tackle some of this? It is complicated,
> > > the RH scripts do quite a bit stuff :\
> >
> > I would be happy to help, but I'm not sure that I understand what should
> > be done :(
> 
> I'm not totally clear either, TBH. The overall topic is to move files
> out of redhat/ and into the common directory. This requires removing
> the redhat-isms and making sure the redhat solution is what we really
> want upstream.
> 
> eg it seems rdma.cxgb[3]4.sys.modprobe is probably best done by patching
> the kernel instead, not copying the modprobe files.
> 
> rdma.kernel-init does:
>  - Load extra ULP modules
>     * /etc/rdma/rdma.conf is not appropriate for Debian
>     * 'TECH_PREVIEW' is a RedHat concept
>  - Obsolete mttr/errata stuff. This is in the kernel now (delete it)
>  - Yet another go at loading extra driver kernel modules (move to
>    kernel)
>  - Something about SRIOV (?)
> 
> For ULP modules, I think we are loading too many by hand, again, the
> kernel really needs fixing to autoload our stuff on first use. So, I
> suggest a quick pass over that idea to see how much kernel code can be
> fixed up.
> 
> So the stuff to move to common user space code might just be the port
> configuration and sriov? But someone needs to study this entire topic
> with a broad view including the kernel.
> 
> Jason

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