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Date:   Wed, 22 Sep 2021 16:59:35 +0300
From:   Leon Romanovsky <leon@kernel.org>
To:     =?utf-8?B?6a2P5L+K5ZCJ?= <weijunji@bytedance.com>
Cc:     Jason Gunthorpe <jgg@nvidia.com>,
        Doug Ledford <dledford@redhat.com>, mst <mst@redhat.com>,
        Jason Wang <jasowang@redhat.com>, yuval.shaia.ml@gmail.com,
        marcel.apfelbaum@gmail.com, Cornelia Huck <cohuck@redhat.com>,
        Hannes Reinecke <hare@suse.de>,
        Yongji Xie <xieyongji@bytedance.com>,
        =?utf-8?B?5p+056iz?= <chaiwen.cc@bytedance.com>,
        RDMA mailing list <linux-rdma@vger.kernel.org>,
        virtualization <virtualization@lists.linux-foundation.org>,
        qemu-devel <qemu-devel@nongnu.org>
Subject: Re: Re: [RFC 0/5] VirtIO RDMA
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On Wed, Sep 22, 2021 at 09:37:37PM +0800, 魏俊吉 wrote:
> On Wed, Sep 22, 2021 at 9:06 PM Leon Romanovsky <leon@kernel.org> wrote:
> >
> > On Wed, Sep 22, 2021 at 08:08:44PM +0800, Junji Wei wrote:
> > > > On Sep 15, 2021, at 9:43 PM, Jason Gunthorpe <jgg@nvidia.com> wrote:
> >
> > <...>
> >
> > > >> 4. The FRMR api need to set key of MR through IB_WR_REG_MR.
> > > >>   But it is impossible to change a key of mr using uverbs.
> > > >
> > > > FRMR is more like memory windows in user space, you can't support it
> > > > using just regular MRs.
> > >
> > > It is hard to support this using uverbs, but it is easy to support
> > > with uRDMA that we can get full control of mrs.
> >
> > What is uRDMA?
> 
> uRDMA is a software implementation of the RoCEv2 protocol like rxe.
> We will implement it in QEMU with VFIO or DPDK.

ok, thanks

> 
> Thanks.
> Junji