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

[Cindy Lu]

On Fri, Feb 23, 2024 at 3:18 AM Michael S. Tsirkin <mst@xxxxxxxxxx> 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
> > 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
>