Re: [PATCH v1 1/4] RDMA/core: add bio_vec based RDMA read/write API

[Leon Romanovsky <leon@kernel.org>]

On Mon, Jan 19, 2026 at 01:03:11PM +0100, Christoph Hellwig wrote:
> On Mon, Jan 19, 2026 at 12:28:57PM +0200, Leon Romanovsky wrote:
> > > > I can add some code to this series to do that, but I don't believe
> > > > I have facilities to test it.
> > > 
> > > Please don't add untested code.  If Leon wants the P2P support and
> > > volunteers to test it, sure.
> > 
> > I can do it with the help of how to setup the system.
> > 
> > > But let's not merge it without being tested.  And at least for NFS I don't
> > > really see how P2P would easily fit in anyway.
> > 
> > Chuck is proposing a new IB/core API that will also be used by NVMe too.
> 
> Hopefully eventually, yes.  Not in this series, though.

Fair enough.

> 
> > Wouldn't p2p be useful in the general case
> 
> Well, P2P into a CMB might work in nfsd in theory now that there is
> direct I/O support, but it'll require a lot of work.
> 
> So if you want to help to convert nvmet, the series to do that would
> be the right place to add P2P support, as with that we can actually
> test it.

If both of you plan to attend LSF/MM this year, and I receive an
invitation as well, we can discuss the future p2p roadmap in person
and how we want to move forward.

Most of the items from our discussion last year [1] have already been
completed or are on track for this or the next development cycle. The
remaining big item which is left is removing SG from RDMA.

Thanks

[1] https://lore.kernel.org/all/20250122071600.GC10702@unreal/


>