[V5,net-next,0/3] virtio-net: synchronize op/admin state

Message

Jason Wang Aug. 5, 2024, 3:02 a.m. UTC

Hi All:

This series tries to synchronize the operstate with the admin state
which allows the lower virtio-net to propagate the link status to the
upper devices like macvlan.

This is done by toggling carrier during ndo_open/stop while doing
other necessary serialization about the carrier settings during probe.

Changes since V4:
- do not update settings during ndo_open()
- do not try to canel config noticiation during probe() as core make
  sure the config notificaiton won't be triggered before probe is
  done.
- Tweak sevreal comments.

Changes since V3:

- when driver tries to enable config interrupt, check pending
  interrupt and execute the nofitication change callback if necessary
- do not unconditonally trigger the config space read
- do not set LINK_UP flag in ndo_open/close but depends on the
  notification change
- disable config change notification until ndo_open()
- read the link status under the rtnl_lock() to prevent a race with
  ndo_open()

Changes since V2:

- introduce config_driver_disabled and helpers
- schedule config change work unconditionally

Jason Wang (3):
  virtio: rename virtio_config_enabled to virtio_config_core_enabled
  virtio: allow driver to disable the configure change notification
  virtio-net: synchronize operstate with admin state on up/down

 drivers/net/virtio_net.c | 78 +++++++++++++++++++++++++---------------
 drivers/virtio/virtio.c  | 59 +++++++++++++++++++++++-------
 include/linux/virtio.h   | 11 ++++--
 3 files changed, 105 insertions(+), 43 deletions(-)