Re: [PATCH rdma-next 00/13] Add RDMA inline crypto support

[Christoph Hellwig]

On Mon, Jan 23, 2023 at 02:57:18PM +0200, Israel Rukshin wrote:
>> - what happens with multipathing? when if not all devices are
>> capable. SW fallback?
> SW fallback happens every time the device doesn't support the specific 
> crypto request (which include data-unit-size, mode and dun_bytes).
> So with multipathing, one path uses the HW crypto offload and the other one 
> uses the SW fallback.

That's a big no-go.  The blk-crypto-fallback code is just a toy example
and not actually safe to use in prodution.  Most importantly it just
kmallocs a bio clone and pages for it without any mempool that guarantees
forward progress.