netdev - Re: [PATCH v7 14/26] virtio: add helper for queue reset

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Date:   Wed, 9 Mar 2022 16:48:28 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Cc:     Jeff Dike <jdike@...toit.com>, Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        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>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...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>,
        Johannes Berg <johannes.berg@...el.com>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        linux-um@...ts.infradead.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
Subject: Re: [PATCH v7 14/26] virtio: add helper for queue reset


在 2022/3/8 下午8:35, Xuan Zhuo 写道:
> Add helper for virtio queue reset.
>
> * virtio_reset_vq(): reset a queue individually
> * virtio_enable_resetq(): enable a reset queue
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
> ---
>   include/linux/virtio_config.h | 40 +++++++++++++++++++++++++++++++++++
>   1 file changed, 40 insertions(+)
>
> diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
> index d51906b1389f..0b81fbe17c85 100644
> --- a/include/linux/virtio_config.h
> +++ b/include/linux/virtio_config.h
> @@ -230,6 +230,46 @@ int virtio_find_vqs_ctx(struct virtio_device *vdev, unsigned nvqs,
>   				      desc);
>   }
>   
> +/**
> + * virtio_reset_vq - reset a queue individually
> + * @vq: the virtqueue
> + *
> + * returns 0 on success or error status
> + *
> + * The api process of reset under normal circumstances:
> + *	1. virtio_reset_vq()              - notify the device to reset the queue
> + *	2. virtqueue_detach_unused_buf()  - recycle the buffer submitted
> + *	3. virtqueue_reset_vring()        - reset the vring (may re-alloc)
> + *	4. virtio_enable_resetq()         - mmap vring to device, and enable the queue
> + *
> + * Caller should guarantee that the vring is not accessed by any functions
> + * of virtqueue.
> + */
> +static inline
> +int virtio_reset_vq(struct virtqueue *vq)
> +{


It looks to me the prefix "virtio" is used for the device specific 
operations.

I wonder if it's better to rename this as virtqueue_reste() and move it 
to virtio_ring.c?

Thanks


> +	if (!vq->vdev->config->reset_vq)
> +		return -ENOENT;
> +
> +	return vq->vdev->config->reset_vq(vq);
> +}
> +
> +/**
> + * virtio_enable_resetq - enable a reset queue
> + * @vq: the virtqueue
> + *
> + * returns 0 on success or error status
> + *
> + */
> +static inline
> +int virtio_enable_resetq(struct virtqueue *vq)
> +{
> +	if (!vq->vdev->config->enable_reset_vq)
> +		return -ENOENT;
> +
> +	return vq->vdev->config->enable_reset_vq(vq);
> +}
> +
>   /**
>    * virtio_device_ready - enable vq use in probe function
>    * @vdev: the device