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SubjectRe: [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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