在 2022/3/14 下午5:34, Xuan Zhuo 写道:
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)
It would be better if you can post Qemu code for review as well.
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.
Looks good overall, see comments in individual patch.
I think the code is structured in a way that is not friendly to the
reviewers. For next version, we can bring back the ethtool -G for
virtio-net.
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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