Re: [dpdk-dev] [PATCH v8 2/2] examples/vdpa: introduce a new sample for vDPA

[Shahaf Shuler <shahafs@mellanox.com>]

Thursday, January 17, 2019 5:13 PM, Ye Xiaolong:
> Subject: Re: [dpdk-dev] [PATCH v8 2/2] examples/vdpa: introduce a new
> sample for vDPA
> 
> Hi,
> 
> On 01/17, Shahaf Shuler wrote:
> >Hi,
> >
> >Going back to this merged commit,
> >
> >Saturday, September 29, 2018 12:48 AM, Xiaolong Ye:
> >> Subject: [dpdk-dev] [PATCH v8 2/2] examples/vdpa: introduce a new
> >> sample for vDPA
> >>
> >> The vdpa sample application creates vhost-user sockets by using the
> >> vDPA backend. vDPA stands for vhost Data Path Acceleration which
> >> utilizes virtio ring compatible devices to serve virtio driver
> >> directly to enable datapath acceleration. As vDPA driver can help to
> >> set up vhost datapath, this application doesn't need to launch
> >> dedicated worker threads for vhost enqueue/dequeue operations.
> >>
> >> Signed-off-by: Xiaolong Ye <xiaolong.ye@intel.com>
> >> Acked-by: Xiao Wang <xiao.w.wang@intel.com>
> >> Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> >> ---
> >
> >[...]
> >
> >> +
> >> +Start the VMs
> >> +~~~~~~~~~~~~~
> >> +
> >> +.. code-block:: console
> >> +
> >> +       qemu-system-x86_64 -cpu host -enable-kvm \
> >> +       <snip>
> >> +       -mem-prealloc \
> >> +       -chardev socket,id=char0,path=<socket_file created in above steps>
> \
> >> +       -netdev type=vhost-user,id=vdpa,chardev=char0 \
> >> +       -device
> >> + virtio-net-pci,netdev=vdpa,mac=00:aa:bb:cc:dd:ee,page-per-vq=on \
> >
> >
> >It doesn't seems like qemu has the id=vdpa and netdev=vdpa options.
> >Grepping vdpa on qemu returns empty.
> >
> >Am using QEMU v3.1.0-513-gfb177a0. Commit head is fb177a036f2e
> ("MAINTAINERS: Mark RISC-V as Supported").
> >
> >Did I missed anything?
> >
> 
> Not quite sure about your question here, the vdpa used in above qemu
> cmdline is just a normal string, you can replace it with other string like
> 
> -netdev type=vhost-user,id=mynet,chardev=char0 \ -device virtio-net-
> pci,netdev=mynet,...
> 
> The major support for vdpa is done in dpdk side as the vhost user backend,
> qemu will use normal vhost user protocol to communicate with it.

Thanks. I mis-interpreted the option fields.

> 
> Thanks,
> Xiaolong