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virtio: simplify config mechanism.

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Previously we used a type/len pair within the config space, but this
seems overkill.  We now simply define a structure which represents the
layout in the config space: the config space can now only be extended
at the end.

The main driver-visible changes:
1) We indicate what fields are present with an explicit feature bit.
2) Virtqueues are explicitly numbered, and not in the config space.

Signed-off-by: Rusty Russell <[email protected]>
This commit is contained in:
Rusty Russell 2008-02-04 23:49:56 -05:00
commit a586d4f601
11 changed files with 280 additions and 281 deletions
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4
net/9p/trans_virtio.c
View file

@ -236,13 +236,13 @@ static int p9_virtio_probe(struct virtio_device *dev)
/* Find the input queue. */
dev->priv = chan;
chan->in_vq = dev->config->find_vq(dev, p9_virtio_intr);
chan->in_vq = dev->config->find_vq(dev, 0, p9_virtio_intr);
if (IS_ERR(chan->in_vq)) {
err = PTR_ERR(chan->in_vq);
goto free;
}
chan->out_vq = dev->config->find_vq(dev, NULL);
chan->out_vq = dev->config->find_vq(dev, 1, NULL);
if (IS_ERR(chan->out_vq)) {
err = PTR_ERR(chan->out_vq);
goto free_in_vq;