netdev - Re: [PATCH v9 10/32] virtio_ring: split: introduce virtqueue_reinit

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Message-ID: <14ab2942-2141-cb1b-14be-35da1c9ee03d@redhat.com>
Date:   Tue, 12 Apr 2022 13:49:40 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        virtualization@...ts.linux-foundation.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, 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
Subject: Re: [PATCH v9 10/32] virtio_ring: split: introduce
 virtqueue_reinit_split()


在 2022/4/6 上午11:43, Xuan Zhuo 写道:
> Introduce a function to initialize vq without allocating new ring,
> desc_state, desc_extra.
>
> Subsequent patches will call this function after reset vq to
> reinitialize vq.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>


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


> ---
>   drivers/virtio/virtio_ring.c | 19 +++++++++++++++++++
>   1 file changed, 19 insertions(+)
>
> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> index 874f878087a3..3dc6ace2ba7a 100644
> --- a/drivers/virtio/virtio_ring.c
> +++ b/drivers/virtio/virtio_ring.c
> @@ -953,6 +953,25 @@ static void vring_virtqueue_init_split(struct vring_virtqueue *vq,
>   	vq->free_head = 0;
>   }
>   
> +static void virtqueue_reinit_split(struct vring_virtqueue *vq)
> +{
> +	struct virtio_device *vdev = vq->vq.vdev;
> +	int size, i;
> +
> +	memset(vq->split.vring.desc, 0, vq->split.queue_size_in_bytes);
> +
> +	size = sizeof(struct vring_desc_state_split) * vq->split.vring.num;
> +	memset(vq->split.desc_state, 0, size);
> +
> +	size = sizeof(struct vring_desc_extra) * vq->split.vring.num;
> +	memset(vq->split.desc_extra, 0, size);
> +
> +	for (i = 0; i < vq->split.vring.num - 1; i++)
> +		vq->split.desc_extra[i].next = i + 1;
> +
> +	vring_virtqueue_init_split(vq, vdev, true);
> +}
> +
>   static void vring_virtqueue_attach_split(struct vring_virtqueue *vq,
>   					 struct vring vring,
>   					 struct vring_desc_state_split *desc_state,