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authorRusty Russell <rusty@rustcorp.com.au>2009-09-24 08:26:31 +0400
committerRusty Russell <rusty@rustcorp.com.au>2009-09-23 16:56:31 +0400
commit3c1b27d5043086a485f8526353ae9fe37bfa1065 (patch)
treee3b6eda3c66bcd1fc3af6e7fa6e4e3af77459474 /drivers/virtio
parentf68d24082e22ccee3077d11aeb6dc5354f0ca7f1 (diff)
downloadlinux-3c1b27d5043086a485f8526353ae9fe37bfa1065.tar.xz
virtio: make add_buf return capacity remaining
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>
Diffstat (limited to 'drivers/virtio')
-rw-r--r--drivers/virtio/virtio_balloon.c2
-rw-r--r--drivers/virtio/virtio_ring.c6
2 files changed, 6 insertions, 2 deletions
diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index 26b278264796..39789232646d 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -84,7 +84,7 @@ static void tell_host(struct virtio_balloon *vb, struct virtqueue *vq)
init_completion(&vb->acked);
/* We should always be able to add one buffer to an empty queue. */
- if (vq->vq_ops->add_buf(vq, &sg, 1, 0, vb) != 0)
+ if (vq->vq_ops->add_buf(vq, &sg, 1, 0, vb) < 0)
BUG();
vq->vq_ops->kick(vq);
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index a882f2606515..f53600580726 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -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)