Re: [PATCH v3] [RFC] rdma/cm: support option to allow manually setting IB path

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

On Wed, Oct 28, 2009 at 11:11:22AM -0700, Roland Dreier wrote:
> This looks fine to me... the only thing I could wonder about is:
> 
>  > +	RDMA_OPTION_ID_TOS	= 0,
>  > +
>  > +	RDMA_OPTION_IB_PATH	= 1
> 
> why a blank line here? ;)
 
> Jason and Or, does this seem ready to queue for 2.6.33?

I like the API as far as passing IB PRs between kernel and userspace,
I'm glad we came up with this. (Sean: I was going to suggest that the
second EINVAL should maybe be ENOSUPPORTED or something - so userspace
can tell the kernel supports the API but did not accept any of the flags
combinations)

But, I still think this API should return EINVAL if the cm_id is in
AF_INET/AF_INET6 mode. That is to say, this API only works with the
AF_IB idea we have been discussing.

I suggest this because using this API really does override the
capabilities of the AF_INET/6 in unexpected ways, as the discussion
drifted through it seemed like at least bonding, routing
and ND operations would/could be overridden.

If so then I'd say it should be part of an AF_IB patch.

Sean, what are your thoughts on applying it to AF_INET/6?

Jason
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