linux-kernel - Re: [net-next RFC V5 4/5] virtio

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Date:	Sun, 29 Jul 2012 12:50:21 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Jason Wang <jasowang@...hat.com>
Cc:	mashirle@...ibm.com, krkumar2@...ibm.com,
	habanero@...ux.vnet.ibm.com, rusty@...tcorp.com.au,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, edumazet@...gle.com,
	tahm@...ux.vnet.ibm.com, jwhan@...ewood.snu.ac.kr,
	davem@...emloft.net, akong@...hat.com, kvm@...r.kernel.org,
	sri@...ibm.com
Subject: Re: [net-next RFC V5 4/5] virtio_net: multiqueue support

On Mon, Jul 23, 2012 at 01:48:35PM +0800, Jason Wang wrote:
> >>+	}
> >>
> >>-	if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) {
> >>+	ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
> >>+					 (const char **)names);
> >>+	if (ret)
> >>+		goto err;
> >>+
> >>+	if (vi->has_cvq)
> >>  		vi->cvq = vqs[2];
> >>
> >>-		if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
> >>-			vi->dev->features |= NETIF_F_HW_VLAN_FILTER;
> >>+	for (i = 0; i<  vi->num_queue_pairs * 2; i += 2) {
> >>+		int j = i == 0 ? i : i + vi->has_cvq;
> >>+		vi->rq[i / 2]->vq = vqs[j];
> >>+		vi->sq[i / 2]->vq = vqs[j + 1];
> >Same here.
> 
> Consider the code is really simple, seem no need to use helpers.

Well it was not simple to at least one reader :)
The problem is not this logic is complex,
it is that it is spread all over the code.

If we had e.g. vnet_tx_vqn_to_queuenum vnet_tx_queuenum_to_vqn
and same for rx, then the logic would all be
in one place, and have a tidy comment on top explaining
the VQ numbering scheme.

-- 
MST
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