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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 <[email protected]>
Cc: Dinesh Subhraveti <[email protected]>
This commit is contained in:
Rusty Russell 2009-09-23 22:26:31 -06:00
commit 3c1b27d504
8 changed files with 19 additions and 15 deletions
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2
net/9p/trans_virtio.c
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@ -200,7 +200,7 @@ p9_virtio_request(struct p9_client *client, struct p9_req_t *req)
req->status = REQ_STATUS_SENT;
if (chan->vq->vq_ops->add_buf(chan->vq, chan->sg, out, in, req->tc)) {
if (chan->vq->vq_ops->add_buf(chan->vq, chan->sg, out, in, req->tc) < 0) {
P9_DPRINTK(P9_DEBUG_TRANS,
"9p debug: virtio rpc add_buf returned failure");
return -EIO;