Re: [PATCH 0/6] refactor RDMA live migration based on rsocket API

[Leon Romanovsky <leon@kernel.org>]

On Wed, Jun 05, 2024 at 10:00:24AM +0000, Gonglei (Arei) wrote:
> 
> 
> > -----Original Message-----
> > From: Michael S. Tsirkin [mailto:mst@redhat.com]
> > Sent: Wednesday, June 5, 2024 3:57 PM
> > To: Gonglei (Arei) <arei.gonglei@huawei.com>
> > Cc: qemu-devel@nongnu.org; peterx@redhat.com; yu.zhang@ionos.com;
> > mgalaxy@akamai.com; elmar.gerdes@ionos.com; zhengchuan
> > <zhengchuan@huawei.com>; berrange@redhat.com; armbru@redhat.com;
> > lizhijian@fujitsu.com; pbonzini@redhat.com; Xiexiangyou
> > <xiexiangyou@huawei.com>; linux-rdma@vger.kernel.org; lixiao (H)
> > <lixiao91@huawei.com>; jinpu.wang@ionos.com; Wangjialin
> > <wangjialin23@huawei.com>
> > Subject: Re: [PATCH 0/6] refactor RDMA live migration based on rsocket API
> > 
> > On Tue, Jun 04, 2024 at 08:14:06PM +0800, Gonglei wrote:
> > > From: Jialin Wang <wangjialin23@huawei.com>
> > >
> > > Hi,
> > >
> > > This patch series attempts to refactor RDMA live migration by
> > > introducing a new QIOChannelRDMA class based on the rsocket API.
> > >
> > > The /usr/include/rdma/rsocket.h provides a higher level rsocket API
> > > that is a 1-1 match of the normal kernel 'sockets' API, which hides
> > > the detail of rdma protocol into rsocket and allows us to add support
> > > for some modern features like multifd more easily.
> > >
> > > Here is the previous discussion on refactoring RDMA live migration
> > > using the rsocket API:
> > >
> > > https://lore.kernel.org/qemu-devel/20240328130255.52257-1-philmd@linar
> > > o.org/
> > >
> > > We have encountered some bugs when using rsocket and plan to submit
> > > them to the rdma-core community.
> > >
> > > In addition, the use of rsocket makes our programming more convenient,
> > > but it must be noted that this method introduces multiple memory
> > > copies, which can be imagined that there will be a certain performance
> > > degradation, hoping that friends with RDMA network cards can help verify,
> > thank you!
> > 
> > So you didn't test it with an RDMA card?
> 
> Yep, we tested it by Soft-ROCE.

Does Soft-RoCE (RXE) support live migration?

Thanks