Re: [PATCH v1 1/4] xprtrdma: Remove support for FMR memory registration

[Bart Van Assche <bvanassche@acm.org>]

On Mon, 2018-11-19 at 10:45 -0500, Chuck Lever wrote:
> FMR is not supported on most recent RDMA devices. It is also slower
> and less secure than FRWR. As discussed during the RDMA BoF at LPC
> 2018, it is time to remove support for FMR in the NFS/RDMA client
> stack. NFS/RDMA server-side uses either local memory registration or
> FRWR.  There is no change required there to deprecate FMR.
> 
> There are a few Infiniband/RoCE devices in the kernel tree that do
> not support MEM_MGT_EXTENSIONS, and therefore will no longer support
> client-side NFS/RDMA. These are:
> 
>  - mthca
>  - qib
>  - usnic
>  - hns (RoCE)

Can someone from Intel comment on how many of their customers rely on the qib
driver?

Can someone from Cisco comment on how many of their customers rely on the usnic
driver?

Can someone from Huawei comment on how many of their customers rely on the hns
driver?

I'm wondering whether I can remove FMR support from the SRP initiator driver.

Thanks,

Bart.