Re: rdma-core build environment enabling out-of-core providers

[Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>]

On Wed, Aug 02, 2017 at 03:05:31PM -0500, Steve Wise wrote:

> > Just be careful that all the cmake magic is working properly in your
> > other environment, for all the distros you want to target..
> 
> Well definitely no magic is happening in my specific experiment, since I just
> copied the headers from the built rdma-core tree which means they were
> customized for RHEL7.2, which is what was installed.  But I just wanted to get a
> feel for what files exactly were needed to build a provider.  I suppose I could
> take that cmake magic into my bldenv and just the src files needed to produce
> the auto-generated files.  Is it just the stdatomic.h file that is tweaked?

valgrind, stdatomic and some of the kernel are currently shimed, plus
some definitions in config.h that control a few things in compiler.h
and some of the ccan headers. The trick is this can change, and
future failure might be silent..

> > This could be automated, so you can develope against upstream, and
> > then using a script create a rdma-core with the classic private ABI,
> > and copy the provider from the upstream to build it.
> > 
> > Alternatively, just have your customers use a new libibverbs on
> > RHEL. That reduces your QA burden and development workload...
> 
> If my package installs libibverbs along with my provider, then
> potentially I break any existing providers installed with whatever
> rdma-core, ofed, or inboxed libibverbs that was installed.  I'm not
> sure if this is acceptable, but I agree it simplifies the QA matrix.

In this case install upstream rdma-core providers along side yours..

Also, I just looked for you, and found this:

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7-Beta/html/7.4_Release_Notes/new_features_networking.html#BZ1404035

So RHEL 7.4 is shipping rdma-core 13 apparently ?

So replacing RHEL 7.4's rdma-core 13 with 15+your stuff is pretty
straightforward, IHMO.

Jason
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