Re: [PATCH 1/5] IB/core: Introduce Fast Indirect Memory Registration verbs API

[Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>]

On Tue, Jun 30, 2015 at 03:59:58PM +0300, Sagi Grimberg wrote:
> Putting the generic API discussion aside for a moment. Indirect
> registration just a generalizes FRWR for SG-lists. The API I
> proposed is a completely symmetrical API for FRWR. So applications that
> implements FRWR can very easily use indirect registration. So I don't
> think it is "a giant nightmare".
> 
> A generic memory registration API would set as an abstraction layer
> that just make the registration operation easier for ULPs. It will be
> implemented above the core verbs layer (It wouldn't make sense to do
> this abstraction below the verbs) so it will need this API in the core
> verbs layer just as well.
> 
> Do you have another suggestion on how to expose this feature in the core
> layer?

Convert the FRWR API with one that takes SGLs, and expose a feature to tell
the client if it can take discontig SGLs.  Next trey to expand the FRWR
API to also cover other memory registration schemes.

> 
> Sagi.
---end quoted text---
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