Re: [Qemu-devel] [PATCH V2 4/5] pvrdma: initial implementation

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Dec 19, 2017 at 04:13:18PM -0300, Philippe Mathieu-Daudé wrote:
> Hi Marcel, Yuval,
> 
> On Sun, Dec 17, 2017 at 9:54 AM, Marcel Apfelbaum <marcel@redhat.com> wrote:
> > From: Yuval Shaia <yuval.shaia@oracle.com>
> >
> > PVRDMA is the QEMU implementation of VMware's paravirtualized RDMA device.
> > It works with its Linux Kernel driver AS IS, no need for any special guest
> > modifications.
> >
> > While it complies with the VMware device, it can also communicate with bare
> > metal RDMA-enabled machines and does not require an RDMA HCA in the host, it
> > can work with Soft-RoCE (rxe).
> >
> > It does not require the whole guest RAM to be pinned allowing memory
> > over-commit and, even if not implemented yet, migration support will be
> > possible with some HW assistance.
> >
> > Signed-off-by: Yuval Shaia <yuval.shaia@oracle.com>
> > Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
> > ---
> [...]
> >  28 files changed, 5132 insertions(+), 4 deletions(-)
> >  create mode 100644 hw/net/pvrdma/pvrdma.h
> >  create mode 100644 hw/net/pvrdma/pvrdma_backend.c
> >  create mode 100644 hw/net/pvrdma/pvrdma_backend.h
> >  create mode 100644 hw/net/pvrdma/pvrdma_backend_defs.h
> >  create mode 100644 hw/net/pvrdma/pvrdma_cmd.c
> >  create mode 100644 hw/net/pvrdma/pvrdma_defs.h
> >  create mode 100644 hw/net/pvrdma/pvrdma_dev_api.h
> >  create mode 100644 hw/net/pvrdma/pvrdma_dev_ring.c
> >  create mode 100644 hw/net/pvrdma/pvrdma_dev_ring.h
> >  create mode 100644 hw/net/pvrdma/pvrdma_ib_verbs.h
> >  create mode 100644 hw/net/pvrdma/pvrdma_main.c
> >  create mode 100644 hw/net/pvrdma/pvrdma_qp_ops.c
> >  create mode 100644 hw/net/pvrdma/pvrdma_qp_ops.h
> >  create mode 100644 hw/net/pvrdma/pvrdma_ring.h
> >  create mode 100644 hw/net/pvrdma/pvrdma_rm.c
> >  create mode 100644 hw/net/pvrdma/pvrdma_rm.h
> >  create mode 100644 hw/net/pvrdma/pvrdma_rm_defs.h
> >  create mode 100644 hw/net/pvrdma/pvrdma_types.h
> >  create mode 100644 hw/net/pvrdma/pvrdma_utils.c
> >  create mode 100644 hw/net/pvrdma/pvrdma_utils.h
> >  create mode 100644 hw/net/pvrdma/trace-events
> [...]
> 
> Since we already have a hw/xenpv/ directory,

But e.g. xen nic is under hw/net/

> can we place these files
> into hw/vmwarepv/ rather than hw/net/pvrdma/?
> 
> A smarter move might be to create a hw/pv/ dir and have hw/pv/{xen,vmware}.
> 
> Regards,
> 
> Phil.

That's not how we layout things. We group them by function not by
interface. Thus I think that hw/rdma/ is better.

-- 
MST