Re: [PATCH rdma-next V2 6/6] RDMA/core: Unify style of IOCTL commands

On Wed, Sep 07, 2016 at 07:55:09PM -0400, ira.weiny wrote:

quoted

2. In new ABI, you will define your special objects, mark them as a
vendor specific and the driver will be called immediately. IMHO, there
is no need in special ioctl.

Well I'm still trying to get time to comment on that series.  One thing which
we are a bit worried about are the number of objects which may be tracked by
for a device and the performance to get to a special driver object (like a PSM
context).  Right now PSM opens a FD and associates a single context with that
FD so the access of that context is O(1).  The addition of special objects and
looking them up adds overhead which _MAY_ be ok but until we get a chance to
evaluate better I can't commit that what you say here is true.

Good to know.