netdev - Re: [PATCH v3 00/17] virtio pci support VIRTIO_F_RING

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Date:   Tue, 8 Feb 2022 10:59:48 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Cc:     virtualization <virtualization@...ts.linux-foundation.org>,
        netdev <netdev@...r.kernel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>, bpf@...r.kernel.org
Subject: Re: [PATCH v3 00/17] virtio pci support VIRTIO_F_RING_RESET


在 2022/2/7 下午2:02, Xuan Zhuo 写道:
> On Mon, 7 Feb 2022 11:39:36 +0800, Jason Wang <jasowang@...hat.com> wrote:
>> On Wed, Jan 26, 2022 at 3:35 PM Xuan Zhuo <xuanzhuo@...ux.alibaba.com> wrote:
>>> ================================================================================
>>> 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?
> Yes, we should reselect a queue.
>
> Thanks.


Maybe a spec patch for that?

Thanks


>
>> 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(-)
>>>
>>> --
>>> 2.31.0
>>>