On Wed, Jan 26, 2022 at 3:35 PM Xuan Zhuo [off-list ref] wrote:

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The virtio spec already supports the virtio queue reset function. This patch set
is to add this function to the kernel. The relevant virtio spec information is
here:

    https://github.com/oasis-tcs/virtio-spec/issues/124

Also regarding MMIO support for queue reset, I plan to support it after this
patch is passed.

#14-#17 is the disable/enable function of rx/tx pair implemented by virtio-net
using the new helper.

One thing that came to mind is the steering. E.g if we disable an RX,
should we stop steering packets to that queue?

Thanks

This function is not currently referenced by other
functions. It is more to show the usage of the new helper, I not sure if they
are going to be merged together.

Please review. Thanks.

v3:
  1. keep vq, irq unreleased

Xuan Zhuo (17):
  virtio_pci: struct virtio_pci_common_cfg add queue_notify_data
  virtio: queue_reset: add VIRTIO_F_RING_RESET
  virtio: queue_reset: struct virtio_config_ops add callbacks for
    queue_reset
  virtio: queue_reset: add helper
  vritio_ring: queue_reset: extract the release function of the vq ring
  virtio_ring: queue_reset: split: add __vring_init_virtqueue()
  virtio_ring: queue_reset: split: support enable reset queue
  virtio_ring: queue_reset: packed: support enable reset queue
  virtio_ring: queue_reset: add vring_reset_virtqueue()
  virtio_pci: queue_reset: update struct virtio_pci_common_cfg and
    option functions
  virtio_pci: queue_reset: release vq by vp_dev->vqs
  virtio_pci: queue_reset: setup_vq use vring_setup_virtqueue()
  virtio_pci: queue_reset: support VIRTIO_F_RING_RESET
  virtio_net: virtnet_tx_timeout() fix style
  virtio_net: virtnet_tx_timeout() stop ref sq->vq
  virtio_net: split free_unused_bufs()
  virtio_net: support pair disable/enable

 drivers/net/virtio_net.c               | 220 ++++++++++++++++++++++---
 drivers/virtio/virtio_pci_common.c     |  62 ++++---
 drivers/virtio/virtio_pci_common.h     |  11 +-
 drivers/virtio/virtio_pci_legacy.c     |   5 +-
 drivers/virtio/virtio_pci_modern.c     | 120 +++++++++++++-
 drivers/virtio/virtio_pci_modern_dev.c |  28 ++++
 drivers/virtio/virtio_ring.c           | 144 +++++++++++-----
 include/linux/virtio.h                 |   1 +
 include/linux/virtio_config.h          |  75 ++++++++-
 include/linux/virtio_pci_modern.h      |   2 +
 include/linux/virtio_ring.h            |  42 +++--
 include/uapi/linux/virtio_config.h     |   7 +-
 include/uapi/linux/virtio_pci.h        |   2 +
 13 files changed, 618 insertions(+), 101 deletions(-)

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2.31.0