[PATCH v5 00/22] virtio pci support VIRTIO_F_RING_RESET

[Xuan Zhuo <xuanzhuo@linux.alibaba.com>]

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.

Performing reset on a queue is divided into four steps:
    1. reset_vq: reset one vq
    2. recycle the buffer from vq by virtqueue_detach_unused_buf()
    3. release the ring of the vq by vring_release_virtqueue()
    4. enable_reset_vq: re-enable the reset queue

#2-#8  : virtio ring support re-enable reset queue and release vring
#9-#14 : virtio PCI support reset queue and re-enable
#15    : add queue reset helper
#16-#17: virtio-net support rx, tx reset
#18-#22: virtio-net support set ringparam

Please review. Thanks.

v5:
  1. add virtio-net support set_ringparam

v4:
  1. just the code of virtio, without virtio-net
  2. Performing reset on a queue is divided into these steps:
    1. reset_vq: reset one vq
    2. recycle the buffer from vq by virtqueue_detach_unused_buf()
    3. release the ring of the vq by vring_release_virtqueue()
    4. enable_reset_vq: re-enable the reset queue
  3. Simplify the parameters of enable_reset_vq()
  4. add container structures for virtio_pci_common_cfg

v3:
  1. keep vq, irq unreleased

Xuan Zhuo (22):
  virtio_pci: struct virtio_pci_common_cfg add queue_notify_data
  virtio: queue_reset: add VIRTIO_F_RING_RESET
  virtio_ring: queue_reset: add function vring_setup_virtqueue()
  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: extract the release function of the vq ring
  virtio_ring: queue_reset: add vring_release_virtqueue()
  virtio: queue_reset: struct virtio_config_ops add callbacks for
    queue_reset
  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() support vring_setup_virtqueue()
  virtio_pci: queue_reset: reserve vq->priv for re-enable queue
  virtio_pci: queue_reset: support VIRTIO_F_RING_RESET
  virtio: queue_reset: add helper
  virtio_net: split free_unused_bufs()
  virtio_net: support rx/tx queue reset
  virtio: add helper virtqueue_get_vring_max_size()
  virtio: add helper virtio_set_max_ring_num()
  virtio_net: set the default max ring num
  virtio_net: get max ring size by virtqueue_get_vring_max_size()
  virtio_net: support set_ringparam

 drivers/net/virtio_net.c               | 238 ++++++++++++++++++++++---
 drivers/virtio/virtio_mmio.c           |   2 +
 drivers/virtio/virtio_pci_common.c     |  61 +++++--
 drivers/virtio/virtio_pci_common.h     |  10 +-
 drivers/virtio/virtio_pci_legacy.c     |   6 +-
 drivers/virtio/virtio_pci_modern.c     |  82 ++++++++-
 drivers/virtio/virtio_pci_modern_dev.c |  36 ++++
 drivers/virtio/virtio_ring.c           | 193 +++++++++++++++-----
 include/linux/virtio.h                 |  15 ++
 include/linux/virtio_config.h          |  82 +++++++++
 include/linux/virtio_pci_modern.h      |   2 +
 include/linux/virtio_ring.h            |  37 ++--
 include/uapi/linux/virtio_config.h     |   7 +-
 include/uapi/linux/virtio_pci.h        |  14 ++
 14 files changed, 668 insertions(+), 117 deletions(-)

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2.31.0