netdev - Re: [PATCH v13 19/42] virtio_ring: packed: extract the logic of alloc state and extra

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Date:   Wed, 27 Jul 2022 12:33:03 +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 19/42] virtio_ring: packed: extract the logic of alloc
 state and extra


在 2022/7/26 15:22, Xuan Zhuo 写道:
> Separate the logic for alloc desc_state and desc_extra, which will
> be called separately by subsequent patches.
>
> Use struct vring_packed to pass desc_state, desc_extra.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>


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


> ---
>   drivers/virtio/virtio_ring.c | 48 +++++++++++++++++++++++++-----------
>   1 file changed, 34 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> index 10cc2b7e3588..32590d763c3b 100644
> --- a/drivers/virtio/virtio_ring.c
> +++ b/drivers/virtio/virtio_ring.c
> @@ -1908,6 +1908,33 @@ static int vring_alloc_queue_packed(struct vring_virtqueue_packed *vring_packed,
>   	return -ENOMEM;
>   }
>   
> +static int vring_alloc_state_extra_packed(struct vring_virtqueue_packed *vring_packed)
> +{
> +	struct vring_desc_state_packed *state;
> +	struct vring_desc_extra *extra;
> +	u32 num = vring_packed->vring.num;
> +
> +	state = kmalloc_array(num, sizeof(struct vring_desc_state_packed), GFP_KERNEL);
> +	if (!state)
> +		goto err_desc_state;
> +
> +	memset(state, 0, num * sizeof(struct vring_desc_state_packed));
> +
> +	extra = vring_alloc_desc_extra(num);
> +	if (!extra)
> +		goto err_desc_extra;
> +
> +	vring_packed->desc_state = state;
> +	vring_packed->desc_extra = extra;
> +
> +	return 0;
> +
> +err_desc_extra:
> +	kfree(state);
> +err_desc_state:
> +	return -ENOMEM;
> +}
> +
>   static struct virtqueue *vring_create_virtqueue_packed(
>   	unsigned int index,
>   	unsigned int num,
> @@ -1922,6 +1949,7 @@ static struct virtqueue *vring_create_virtqueue_packed(
>   {
>   	struct vring_virtqueue_packed vring_packed = {};
>   	struct vring_virtqueue *vq;
> +	int err;
>   
>   	if (vring_alloc_queue_packed(&vring_packed, vdev, num))
>   		goto err_ring;
> @@ -1961,18 +1989,12 @@ static struct virtqueue *vring_create_virtqueue_packed(
>   	vq->packed.event_flags_shadow = 0;
>   	vq->packed.avail_used_flags = 1 << VRING_PACKED_DESC_F_AVAIL;
>   
> -	vq->packed.desc_state = kmalloc_array(num,
> -			sizeof(struct vring_desc_state_packed),
> -			GFP_KERNEL);
> -	if (!vq->packed.desc_state)
> -		goto err_desc_state;
> -
> -	memset(vq->packed.desc_state, 0,
> -		num * sizeof(struct vring_desc_state_packed));
> +	err = vring_alloc_state_extra_packed(&vring_packed);
> +	if (err)
> +		goto err_state_extra;
>   
> -	vq->packed.desc_extra = vring_alloc_desc_extra(num);
> -	if (!vq->packed.desc_extra)
> -		goto err_desc_extra;
> +	vq->packed.desc_state = vring_packed.desc_state;
> +	vq->packed.desc_extra = vring_packed.desc_extra;
>   
>   	/* No callback?  Tell other side not to bother us. */
>   	if (!callback) {
> @@ -1988,9 +2010,7 @@ static struct virtqueue *vring_create_virtqueue_packed(
>   	spin_unlock(&vdev->vqs_list_lock);
>   	return &vq->vq;
>   
> -err_desc_extra:
> -	kfree(vq->packed.desc_state);
> -err_desc_state:
> +err_state_extra:
>   	kfree(vq);
>   err_vq:
>   	vring_free_packed(&vring_packed, vdev);