[net-next,v4,0/6] Remove RTNL lock protection of CVQ

Message

Dan Jurgens April 16, 2024, 7:30 p.m. UTC

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 spin lock
to protect the control buffer and writing SGs to the control VQ.

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 | 256 +++++++++++++++++++++++----------------
 1 file changed, 149 insertions(+), 107 deletions(-)