From: "Morten Brørup" <mb@smartsharesystems.com>
To: "Xia, Chenbo" <chenbo.xia@intel.com>,
"Maxime Coquelin" <maxime.coquelin@redhat.com>,
"Ferruh Yigit" <ferruh.yigit@amd.com>, <dev@dpdk.org>,
<david.marchand@redhat.com>, <mkp@redhat.com>, <fbl@redhat.com>,
<jasowang@redhat.com>, "Liang, Cunming" <cunming.liang@intel.com>,
"Xie, Yongji" <xieyongji@bytedance.com>, <echaudro@redhat.com>,
<eperezma@redhat.com>, <amorenoz@redhat.com>
Subject: RE: [RFC 00/27] Add VDUSE support to Vhost library
Date: Thu, 13 Apr 2023 09:58:52 +0200 [thread overview]
Message-ID: <98CBD80474FA8B44BF855DF32C47DC35D8786C@smartserver.smartshare.dk> (raw)
In-Reply-To: <SN6PR11MB3504827BB8CA631A082C8AC09C989@SN6PR11MB3504.namprd11.prod.outlook.com>
> From: Xia, Chenbo [mailto:chenbo.xia@intel.com]
> Sent: Thursday, 13 April 2023 09.08
>
> > From: Morten Brørup <mb@smartsharesystems.com>
> > Sent: Thursday, April 13, 2023 3:41 AM
> >
> > > From: Maxime Coquelin [mailto:maxime.coquelin@redhat.com]
> > > Sent: Wednesday, 12 April 2023 17.28
> > >
> > > Hi Ferruh,
> > >
> > > On 4/12/23 13:33, Ferruh Yigit wrote:
> > > > On 3/31/2023 4:42 PM, Maxime Coquelin wrote:
> > > >> This series introduces a new type of backend, VDUSE,
> > > >> to the Vhost library.
> > > >>
> > > >> VDUSE stands for vDPA device in Userspace, it enables
> > > >> implementing a Virtio device in userspace and have it
> > > >> attached to the Kernel vDPA bus.
> > > >>
> > > >> Once attached to the vDPA bus, it can be used either by
> > > >> Kernel Virtio drivers, like virtio-net in our case, via
> > > >> the virtio-vdpa driver. Doing that, the device is visible
> > > >> to the Kernel networking stack and is exposed to userspace
> > > >> as a regular netdev.
> > > >>
> > > >> It can also be exposed to userspace thanks to the
> > > >> vhost-vdpa driver, via a vhost-vdpa chardev that can be
> > > >> passed to QEMU or Virtio-user PMD.
> > > >>
> > > >> While VDUSE support is already available in upstream
> > > >> Kernel, a couple of patches are required to support
> > > >> network device type:
> > > >>
> > > >> https://gitlab.com/mcoquelin/linux/-/tree/vduse_networking_poc
> > > >>
> > > >> In order to attach the created VDUSE device to the vDPA
> > > >> bus, a recent iproute2 version containing the vdpa tool is
> > > >> required.
> > > >
> > > > Hi Maxime,
> > > >
> > > > Is this a replacement to the existing DPDK vDPA framework? What is the
> > > > plan for long term?
> > > >
> > >
> > > No, this is not a replacement for DPDK vDPA framework.
> > >
> > > We (Red Hat) don't have plans to support DPDK vDPA framework in our
> > > products, but there are still contribution to DPDK vDPA by several vDPA
> > > hardware vendors (Intel, Nvidia, Xilinx), so I don't think it is going
> > > to be deprecated soon.
> >
> > Ferruh's question made me curious...
> >
> > I don't know anything about VDUSE or vDPA, and don't use any of it, so
> > consider me ignorant in this area.
> >
> > Is VDUSE an alternative to the existing DPDK vDPA framework? What are the
> > differences, e.g. in which cases would an application developer (or user)
> > choose one or the other?
>
> Maxime should give better explanation.. but let me just explain a bit.
>
> Vendors have vDPA HW that support vDPA framework (most likely in their DPU/IPU
> products). This work is introducing a way to emulate a SW vDPA device in
> userspace (DPDK), and this SW vDPA device also supports vDPA framework.
>
> So it's not an alternative to existing DPDK vDPA framework :)
>
> Thanks,
> Chenbo
Not an alternative, then nothing further from me. :-)
>
> >
> > And if it is a better alternative, perhaps the documentation should
> > mention that it is recommended over DPDK vDPA. Just like we started
> > recommending alternatives to the KNI driver, so we could phase it out and
> > eventually get rid of it.
> >
> > >
> > > Regards,
> > > Maxime
next prev parent reply other threads:[~2023-04-13 7:58 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-31 15:42 Maxime Coquelin
2023-03-31 15:42 ` [RFC 01/27] vhost: fix missing guest notif stat increment Maxime Coquelin
2023-04-24 2:57 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 02/27] vhost: fix invalid call FD handling Maxime Coquelin
2023-04-24 2:58 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 03/27] vhost: fix IOTLB entries overlap check with previous entry Maxime Coquelin
2023-04-17 19:15 ` Mike Pattrick
2023-04-24 2:58 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 04/27] vhost: add helper of IOTLB entries coredump Maxime Coquelin
2023-04-24 2:59 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 05/27] vhost: add helper for IOTLB entries shared page check Maxime Coquelin
2023-04-17 19:39 ` Mike Pattrick
2023-04-19 9:35 ` Maxime Coquelin
2023-04-19 14:52 ` Mike Pattrick
2023-04-24 2:59 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 06/27] vhost: don't dump unneeded pages with IOTLB Maxime Coquelin
2023-04-20 17:11 ` Mike Pattrick
2023-04-24 3:00 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 07/27] vhost: change to single IOTLB cache per device Maxime Coquelin
2023-04-25 6:19 ` Xia, Chenbo
2023-05-03 13:47 ` Maxime Coquelin
2023-03-31 15:42 ` [RFC 08/27] vhost: add offset field to IOTLB entries Maxime Coquelin
2023-04-25 6:20 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 09/27] vhost: add page size info to IOTLB entry Maxime Coquelin
2023-04-25 6:20 ` Xia, Chenbo
2023-05-03 13:57 ` Maxime Coquelin
2023-03-31 15:42 ` [RFC 10/27] vhost: retry translating IOVA after IOTLB miss Maxime Coquelin
2023-05-05 5:07 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 11/27] vhost: introduce backend ops Maxime Coquelin
2023-05-05 5:07 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 12/27] vhost: add IOTLB cache entry removal callback Maxime Coquelin
2023-05-05 5:07 ` Xia, Chenbo
2023-05-25 11:20 ` Maxime Coquelin
2023-03-31 15:42 ` [RFC 13/27] vhost: add helper for IOTLB misses Maxime Coquelin
2023-03-31 15:42 ` [RFC 14/27] vhost: add helper for interrupt injection Maxime Coquelin
2023-05-05 5:07 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 15/27] vhost: add API to set max queue pairs Maxime Coquelin
2023-05-05 5:07 ` Xia, Chenbo
2023-05-25 11:23 ` Maxime Coquelin
2023-03-31 15:42 ` [RFC 16/27] net/vhost: use " Maxime Coquelin
2023-05-05 5:07 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 17/27] vhost: add control virtqueue support Maxime Coquelin
2023-05-09 5:29 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 18/27] vhost: add VDUSE device creation and destruction Maxime Coquelin
2023-05-09 5:31 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 19/27] vhost: add VDUSE callback for IOTLB miss Maxime Coquelin
2023-05-09 5:31 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 20/27] vhost: add VDUSE callback for IOTLB entry removal Maxime Coquelin
2023-05-09 5:32 ` Xia, Chenbo
2023-05-25 11:35 ` Maxime Coquelin
2023-03-31 15:42 ` [RFC 21/27] vhost: add VDUSE callback for IRQ injection Maxime Coquelin
2023-05-09 5:33 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 22/27] vhost: add VDUSE events handler Maxime Coquelin
2023-05-09 5:34 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 23/27] vhost: add support for virtqueue state get event Maxime Coquelin
2023-05-09 5:34 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 24/27] vhost: add support for VDUSE status set event Maxime Coquelin
2023-05-09 5:34 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 25/27] vhost: add support for VDUSE IOTLB update event Maxime Coquelin
2023-05-09 5:35 ` Xia, Chenbo
2023-05-25 11:43 ` Maxime Coquelin
2023-03-31 15:42 ` [RFC 26/27] vhost: add VDUSE device startup Maxime Coquelin
2023-05-09 5:35 ` Xia, Chenbo
2023-03-31 15:42 ` [RFC 27/27] vhost: add multiqueue support to VDUSE Maxime Coquelin
2023-05-09 5:35 ` Xia, Chenbo
2023-04-06 3:44 ` [RFC 00/27] Add VDUSE support to Vhost library Yongji Xie
2023-04-06 8:16 ` Maxime Coquelin
2023-04-06 11:04 ` Yongji Xie
2023-04-12 11:33 ` Ferruh Yigit
2023-04-12 15:28 ` Maxime Coquelin
2023-04-12 19:40 ` Morten Brørup
2023-04-13 7:08 ` Xia, Chenbo
2023-04-13 7:58 ` Morten Brørup [this message]
2023-04-13 7:59 ` Maxime Coquelin
2023-04-14 10:48 ` Ferruh Yigit
2023-04-14 12:06 ` Maxime Coquelin
2023-04-14 14:25 ` Ferruh Yigit
2023-04-17 3:10 ` Jason Wang
2023-05-05 5:53 ` Xia, Chenbo
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