netdev - Re: [PATCH v13 22/42] virtio_ring: packed: introduce virtqueue_reinit

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Date:   Wed, 27 Jul 2022 12:35:12 +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 v13 22/42] virtio_ring: packed: introduce
 virtqueue_reinit_packed()


在 2022/7/26 15:22, 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 | 21 +++++++++++++++++++++
>   1 file changed, 21 insertions(+)
>
> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> index 00b18cf3b4d9..7d4c444b5a9d 100644
> --- a/drivers/virtio/virtio_ring.c
> +++ b/drivers/virtio/virtio_ring.c
> @@ -1957,6 +1957,27 @@ static void virtqueue_vring_attach_packed(struct vring_virtqueue *vq,
>   	vq->packed = *vring_packed;
>   }
>   
> +static void virtqueue_reinit_packed(struct vring_virtqueue *vq)
> +{
> +	int size, i;
> +
> +	memset(vq->packed.vring.device, 0, vq->packed.event_size_in_bytes);
> +	memset(vq->packed.vring.driver, 0, vq->packed.event_size_in_bytes);
> +	memset(vq->packed.vring.desc, 0, vq->packed.ring_size_in_bytes);
> +
> +	size = sizeof(struct vring_desc_state_packed) * vq->packed.vring.num;
> +	memset(vq->packed.desc_state, 0, size);
> +
> +	size = sizeof(struct vring_desc_extra) * vq->packed.vring.num;
> +	memset(vq->packed.desc_extra, 0, size);
> +
> +	for (i = 0; i < vq->packed.vring.num - 1; i++)
> +		vq->packed.desc_extra[i].next = i + 1;
> +
> +	virtqueue_init(vq, vq->packed.vring.num);
> +	virtqueue_vring_init_packed(&vq->packed, !!vq->vq.callback);
> +}
> +
>   static struct virtqueue *vring_create_virtqueue_packed(
>   	unsigned int index,
>   	unsigned int num,