Re: [PATCH net-next v6 0/6] Remove RTNL lock protection of CVQ

[Heng Qi <hengqi@linux.alibaba.com>]

On Fri, 3 May 2024 23:24:39 +0300, Daniel Jurgens <danielj@nvidia.com> wrote:
> Currently the buffer used for control VQ commands is protected by the
> RTNL lock. Previously this wasn't a major concern because the control VQ
> was only used during device setup and user interaction. With the recent
> addition of dynamic interrupt moderation the control VQ may be used
> frequently during normal operation.
> 
> This series removes the RNTL lock dependency by introducing a mutex
> to protect the control buffer and writing SGs to the control VQ.
> 

For the series, keep tags:

Reviewed-by: Heng Qi <hengqi@linux.alibaba.com>
Tested-by: Heng Qi <hengqi@linux.alibaba.com>


> v6:
> 	- Rebased over new stats code.
> 	- Added comment to cvq_lock, init the mutex unconditionally,
> 	  and replaced some duplicate code with a goto.
> 	- Fixed minor grammer errors, checkpatch warnings, and clarified
> 	  a comment.
> v5:
> 	- Changed cvq_lock to a mutex.
> 	- Changed dim_lock to mutex, because it's held taking
> 	  the cvq_lock.
> 	- Use spin/mutex_lock/unlock vs guard macros.
> v4:
> 	- Protect dim_enabled with same lock as well intr_coal.
> 	- Rename intr_coal_lock to dim_lock.
> 	- Remove some scoped_guard where the error path doesn't
> 	  have to be in the lock.
> v3:
> 	- Changed type of _offloads to __virtio16 to fix static
> 	  analysis warning.
> 	- Moved a misplaced hunk to the correct patch.
> v2:
> 	- New patch to only process the provided queue in
> 	  virtnet_dim_work
> 	- New patch to lock per queue rx coalescing structure.
> 
> Daniel Jurgens (6):
>   virtio_net: Store RSS setting in virtnet_info
>   virtio_net: Remove command data from control_buf
>   virtio_net: Add a lock for the command VQ.
>   virtio_net: Do DIM update for specified queue only
>   virtio_net: Add a lock for per queue RX coalesce
>   virtio_net: Remove rtnl lock protection of command buffers
> 
>  drivers/net/virtio_net.c | 288 +++++++++++++++++++++++----------------
>  1 file changed, 173 insertions(+), 115 deletions(-)
> 
> -- 
> 2.44.0
> 
>