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virtio: make add_buf return capacity remaining

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This API change means that virtio_net can tell how much capacity
remains for buffers.  It's necessarily fuzzy, since
VIRTIO_RING_F_INDIRECT_DESC means we can fit any number of descriptors
in one, *if* we can kmalloc.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Dinesh Subhraveti <dineshs@us.ibm.com>
This commit is contained in:
Rusty Russell
2009-09-23 22:26:31 -06:00
parent f68d24082e
commit 3c1b27d504
8 changed files with 19 additions and 15 deletions
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6
drivers/virtio/virtio_ring.c
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@ -208,7 +208,11 @@ add_head:
pr_debug("Added buffer head %i to %p\n", head, vq);
END_USE(vq);
return 0;
/* If we're indirect, we can fit many (assuming not OOM). */
if (vq->indirect)
return vq->num_free ? vq->vring.num : 0;
return vq->num_free;
}
static void vring_kick(struct virtqueue *_vq)