[PATCH 5/9] staging/rdma/hfi1: Add function stubs for TID caching

[Or Gerlitz]

On Sat, Oct 31, 2015 at 12:41 AM,  <ira.weiny at intel.com> wrote:
> From: Mitko Haralanov <mitko.haralanov at intel.com>
>
> Add mmu notify helper functions and TID caching function stubs in preparation
> for the TID caching implementation.
>
> TID caching makes use of the MMU notifier to allow the driver to respond to the
> user freeing memory which is allocated to the HFI.
>
> This patch implements the basic MMU notifier functions to insert, find and
> remove buffer pages from memory based on the mmu_notifier being invoked.
>
> In addition it places stubs in place for the main entry points by follow on
> code.
>
> Follow up patches will complete the implementation of the interaction with user
> space and makes use of these functions.

So this is an wholy orthogonal mechanism for memory registrations or
de-registrations vs
what's supported by the upstream RDMA stack to which this driver
attempts to be a HW provider, right?

Ira, Mike - why do that?

2. Greg - I read an earlier comment you made that a driver in staging
need to be 1st
and most **fixed** with patches such that the TODO items to get it out
of staging are
addressed. I see here every day long train of features going into this
driver, should the
focus need to be elsewhere, according to the staging guidelines?

Or.


>  drivers/staging/rdma/hfi1/Kconfig        |   1 +
>  drivers/staging/rdma/hfi1/Makefile       |   2 +-
>  drivers/staging/rdma/hfi1/user_exp_rcv.c | 314 +++++++++++++++++++++++++++++++
>  drivers/staging/rdma/hfi1/user_exp_rcv.h |   8 +
>  4 files changed, 324 insertions(+), 1 deletion(-)