netdev - Re: [PATCH v12 24/40] virtio: allow to unbreak/break virtqueue individually

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Message-ID: <da5ddf3b-3db7-7f25-a0f6-63a39e6af2a2@redhat.com>
Date:   Thu, 21 Jul 2022 17:14:10 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        virtualization@...ts.linux-foundation.org
Cc:     Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        Vadim Pasternak <vadimp@...dia.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Cornelia Huck <cohuck@...hat.com>,
        Halil Pasic <pasic@...ux.ibm.com>,
        Eric Farman <farman@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        linux-um@...ts.infradead.org, netdev@...r.kernel.org,
        platform-driver-x86@...r.kernel.org,
        linux-remoteproc@...r.kernel.org, linux-s390@...r.kernel.org,
        kvm@...r.kernel.org, bpf@...r.kernel.org,
        kangjie.xu@...ux.alibaba.com
Subject: Re: [PATCH v12 24/40] virtio: allow to unbreak/break virtqueue
 individually


在 2022/7/20 11:04, Xuan Zhuo 写道:
> This patch allows the new introduced
> __virtqueue_break()/__virtqueue_unbreak() to break/unbreak the
> virtqueue.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>


Acked-by: Jason Wang <jasowang@...hat.com>


> ---
>   drivers/virtio/virtio_ring.c | 24 ++++++++++++++++++++++++
>   include/linux/virtio.h       |  3 +++
>   2 files changed, 27 insertions(+)
>
> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> index cf4379175163..bf666dad9904 100644
> --- a/drivers/virtio/virtio_ring.c
> +++ b/drivers/virtio/virtio_ring.c
> @@ -2730,6 +2730,30 @@ unsigned int virtqueue_get_vring_size(struct virtqueue *_vq)
>   }
>   EXPORT_SYMBOL_GPL(virtqueue_get_vring_size);
>   
> +/*
> + * This function should only be called by the core, not directly by the driver.
> + */
> +void __virtqueue_break(struct virtqueue *_vq)
> +{
> +	struct vring_virtqueue *vq = to_vvq(_vq);
> +
> +	/* Pairs with READ_ONCE() in virtqueue_is_broken(). */
> +	WRITE_ONCE(vq->broken, true);
> +}
> +EXPORT_SYMBOL_GPL(__virtqueue_break);
> +
> +/*
> + * This function should only be called by the core, not directly by the driver.
> + */
> +void __virtqueue_unbreak(struct virtqueue *_vq)
> +{
> +	struct vring_virtqueue *vq = to_vvq(_vq);
> +
> +	/* Pairs with READ_ONCE() in virtqueue_is_broken(). */
> +	WRITE_ONCE(vq->broken, false);
> +}
> +EXPORT_SYMBOL_GPL(__virtqueue_unbreak);
> +
>   bool virtqueue_is_broken(struct virtqueue *_vq)
>   {
>   	struct vring_virtqueue *vq = to_vvq(_vq);
> diff --git a/include/linux/virtio.h b/include/linux/virtio.h
> index 62e31bca5602..d45ee82a4470 100644
> --- a/include/linux/virtio.h
> +++ b/include/linux/virtio.h
> @@ -138,6 +138,9 @@ bool is_virtio_device(struct device *dev);
>   void virtio_break_device(struct virtio_device *dev);
>   void __virtio_unbreak_device(struct virtio_device *dev);
>   
> +void __virtqueue_break(struct virtqueue *_vq);
> +void __virtqueue_unbreak(struct virtqueue *_vq);
> +
>   void virtio_config_changed(struct virtio_device *dev);
>   #ifdef CONFIG_PM_SLEEP
>   int virtio_device_freeze(struct virtio_device *dev);