linux-kernel - Re: [PATCH v4 0/5] vduse: Add support for reconnection

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Date: Wed, 20 Mar 2024 13:47:41 +0800
From: Cindy Lu <lulu@...hat.com>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: jasowang@...hat.com, xieyongji@...edance.com, linux-kernel@...r.kernel.org, 
	maxime.coquelin@...hat.com
Subject: Re: [PATCH v4 0/5] vduse: Add support for reconnection

On Tue, Mar 19, 2024 at 2:37 PM Michael S. Tsirkin <mst@...hat.com> wrote:
>
> On Fri, Mar 08, 2024 at 03:29:50PM +0800, Cindy Lu wrote:
> > On Fri, Feb 23, 2024 at 3:18 AM Michael S. Tsirkin <mst@...hat.com> wrote:
> > >
> > > On Wed, Feb 07, 2024 at 01:43:27PM +0800, Cindy Lu wrote:
> > > > Here is the reconnect support in vduse,
> > > >
> > > > Kernel will allocate pages for reconnection.
> > > > Userspace needs to use mmap to map the memory to userspace and use these pages to
> > > > save the reconnect information.
> > >
> > > What is "reconnect"? Not really clear from documentation - it seems to
> > > be assumed that reader has an idea but most don't.
> > >
> > > Also what's with all the typos? reconnect with 3 nnn s, sutiable and so
> > > on. Can you pls run a speller?
> > >
> > Thanks a lot, Micheal. I will fix these and also update the speller
> > thanks
> > Cindy
>
> Didn't get an updated version, dropped the patch from the pull for this
> merge window.
>
Hi Micheal
Really apologize for the delay, I was working in an emergency bug, I
will provide the updated version soon
apologize again for this mistake
Thanks
Cindy
> > > > test passd in vduse+dpdk-testpmd
> > > >
> > > > change in V2
> > > > 1. Address the comments from v1
> > > > 2. Add the document for reconnect process
> > > >
> > > > change in V3
> > > > 1. Move the vdpa_vq_state to the uAPI.  vduse will use this to synchronize the vq info between the kernel and userspace app.
> > > > 2. Add a new ioctl VDUSE_DEV_GET_CONFIG. userspace app use this to get config space
> > > > 3. Rewrite the commit message.
> > > > 4. Only save the address for the page address and remove the index.
> > > > 5. remove the ioctl VDUSE_GET_RECONNECT_INFO, userspace app will use uAPI VDUSE_RECONNCT_MMAP_SIZE to mmap
> > > > 6. Rewrite the document for the reconnect process to make it clearer.
> > > >
> > > > change in v4
> > > > 1. Change the number of map pages to VQ numbers. UserSpace APP can define and maintain the structure for saving reconnection information in userspace. The kernel will not maintain this information.
> > > > 2. Rewrite the document for the reconnect process to make it clearer.
> > > > 3. add the new ioctl for VDUSE_DEV_GET_CONFIG/VDUSE_DEV_GET_STATUS
> > > >
> > > > Cindy Lu (5):
> > > >   vduse: Add new ioctl VDUSE_DEV_GET_CONFIG
> > > >   vduse: Add new ioctl VDUSE_DEV_GET_STATUS
> > > >   vduse: Add function to get/free the pages for reconnection
> > > >   vduse: Add file operation for mmap
> > > >   Documentation: Add reconnect process for VDUSE
> > > >
> > > >  Documentation/userspace-api/vduse.rst |  32 +++++++
> > > >  drivers/vdpa/vdpa_user/vduse_dev.c    | 125 ++++++++++++++++++++++++++
> > > >  include/uapi/linux/vduse.h            |   5 ++
> > > >  3 files changed, 162 insertions(+)
> > > >
> > > > --
> > > > 2.43.0
> > >
>