[PATCH v8 00/16] virtio pci support VIRTIO_F_RING_RESET (refactor vring)

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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.

This patch set implements the refactoring of vring. Finally, the
virtuque_resize() interface is provided based on the reset function of the
transport layer.

Test environment:
    Host: 4.19.91
    Qemu: QEMU emulator version 6.2.50 (with vq reset support)
    Test Cmd:  ethtool -G eth1 rx $1 tx $2; ethtool -g eth1

    The default is split mode, modify Qemu virtio-net to add PACKED feature to test
    packed mode.

Please review. Thanks.

v8:
  1. Provide a virtqueue_reset() interface directly
  2. Split the two patch sets, this is the first part
  3. Add independent allocation helper for allocating state, extra

v7:
  1. fix #6 subject typo
  2. fix #6 ring_size_in_bytes is uninitialized
  3. check by: make W=12

v6:
  1. virtio_pci: use synchronize_irq(irq) to sync the irq callbacks
  2. Introduce virtqueue_reset_vring() to implement the reset of vring during
     the reset process. May use the old vring if num of the vq not change.
  3. find_vqs() support sizes to special the max size of each vq

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 (16):
  virtio: add helper virtqueue_get_vring_max_size()
  virtio: struct virtio_config_ops add callbacks for queue_reset
  virtio_ring: update the document of the virtqueue_detach_unused_buf
    for queue reset
  virtio_ring: remove the arg vq of vring_alloc_desc_extra()
  virtio_ring: extract the logic of freeing vring
  virtio_ring: split: extract the logic of alloc queue
  virtio_ring: split: extract the logic of alloc state and extra
  virtio_ring: split: extract the logic of attach vring
  virtio_ring: split: extract the logic of vq init
  virtio_ring: split: implement virtqueue_resize_split()
  virtio_ring: packed: extract the logic of alloc queue
  virtio_ring: packed: extract the logic of alloc state and extra
  virtio_ring: packed: extract the logic of attach vring
  virtio_ring: packed: extract the logic of vq init
  virtio_ring: packed: implement virtqueue_resize_packed()
  virtio_ring: introduce virtqueue_resize()

 drivers/virtio/virtio_mmio.c       |   2 +
 drivers/virtio/virtio_pci_legacy.c |   2 +
 drivers/virtio/virtio_pci_modern.c |   2 +
 drivers/virtio/virtio_ring.c       | 604 ++++++++++++++++++++++-------
 include/linux/virtio.h             |   5 +
 include/linux/virtio_config.h      |  12 +
 6 files changed, 494 insertions(+), 133 deletions(-)

--
2.31.0

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