Re: [PATCH v5 00/25] RTRS (former IBTRS) rdma transport library and the corresponding RNBD (former IBNBD) rdma network block device

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On Fri, Dec 20, 2019 at 04:50:44PM +0100, Jack Wang wrote:
> Hi all,
> 
> here is V5 of the RTRS (former IBTRS) rdma transport library and the 
> corresponding RNBD (former IBNBD) rdma network block device.
> 
> Main changes are the following:
> 1. Fix the security problem pointed out by Jason
> 2. Implement code-style/readability/API/etc suggestions by Bart van Assche
> 3. Rename IBTRS and IBNBD to RTRS and RNBD accordingly
> 4. Fileio mode support in rnbd-srv has been removed.
> 
> The main functional change is a fix for the security problem pointed out by 
> Jason and discussed both on the mailing list and during the last LPC RDMA MC 2019.
> On the server side we now invalidate in RTRS each rdma buffer before we hand it
> over to RNBD server and in turn to the block layer. A new rkey is generated and
> registered for the buffer after it returns back from the block layer and RNBD
> server. The new rkey is sent back to the client along with the IO result.
> The procedure is the default behaviour of the driver. This invalidation and
> registration on each IO causes performance drop of up to 20%. A user of the
> driver may choose to load the modules with this mechanism switched
> off

So, how does this compare now to nvme over fabrics?

I recall there were questiosn why we needed yet another RDMA block
transport?

Jason



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