linux-kernel - Re: [net-next rfc v7 1/3] virtio-net: separate fields of sending/receiving queue from virtnet

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Date:	Mon, 03 Dec 2012 12:25:42 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Jason Wang <jasowang@...hat.com>, mst@...hat.com,
	krkumar2@...ibm.com, virtualization@...ts.linux-foundation.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	kvm@...r.kernel.org, bhutchings@...arflare.com,
	jwhan@...ewood.snu.ac.kr, shiyer@...hat.com,
	Jason Wang <jasowang@...hat.com>
Subject: Re: [net-next rfc v7 1/3] virtio-net: separate fields of sending/receiving queue from virtnet_info

Jason Wang <jasowang@...hat.com> writes:
> To support multiqueue transmitq/receiveq, the first step is to separate queue
> related structure from virtnet_info. This patch introduce send_queue and
> receive_queue structure and use the pointer to them as the parameter in
> functions handling sending/receiving.

OK, seems like a straightforward xform: a few nit-picks:

> +/* Internal representation of a receive virtqueue */
> +struct receive_queue {
> +	/* Virtqueue associated with this receive_queue */
> +	struct virtqueue *vq;
> +
> +        struct napi_struct napi;
> +
> +        /* Number of input buffers, and max we've ever had. */
> +        unsigned int num, max;

Weird whitespace here.

> +
> +	/* Work struct for refilling if we run low on memory. */
> +	struct delayed_work refill;

I can't really see the justificaiton for a refill per queue.  Just have
one work iterate all the queues if it happens, unless it happens often
(in which case, we need to look harder at this anyway).

>  struct virtnet_info {
>  	struct virtio_device *vdev;
> -	struct virtqueue *rvq, *svq, *cvq;
> +	struct virtqueue *cvq;
>  	struct net_device *dev;
>  	struct napi_struct napi;

You leave napi here, and take it away in the next patch.  I think it's
supposed to go away now.

Cheers,
Rusty.
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