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-rw-r--r--drivers/xen/pvcalls-back.c75
1 files changed, 74 insertions, 1 deletions
diff --git a/drivers/xen/pvcalls-back.c b/drivers/xen/pvcalls-back.c
index 9a4bdc5e5d34..06bd95d4d552 100644
--- a/drivers/xen/pvcalls-back.c
+++ b/drivers/xen/pvcalls-back.c
@@ -355,11 +355,34 @@ out_error:
static void pvcalls_pass_sk_data_ready(struct sock *sock)
{
struct sockpass_mapping *mappass = sock->sk_user_data;
+ struct pvcalls_fedata *fedata;
+ struct xen_pvcalls_response *rsp;
+ unsigned long flags;
+ int notify;
if (mappass == NULL)
return;
- queue_work(mappass->wq, &mappass->register_work);
+ fedata = mappass->fedata;
+ spin_lock_irqsave(&mappass->copy_lock, flags);
+ if (mappass->reqcopy.cmd == PVCALLS_POLL) {
+ rsp = RING_GET_RESPONSE(&fedata->ring,
+ fedata->ring.rsp_prod_pvt++);
+ rsp->req_id = mappass->reqcopy.req_id;
+ rsp->u.poll.id = mappass->reqcopy.u.poll.id;
+ rsp->cmd = mappass->reqcopy.cmd;
+ rsp->ret = 0;
+
+ mappass->reqcopy.cmd = 0;
+ spin_unlock_irqrestore(&mappass->copy_lock, flags);
+
+ RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&fedata->ring, notify);
+ if (notify)
+ notify_remote_via_irq(mappass->fedata->irq);
+ } else {
+ spin_unlock_irqrestore(&mappass->copy_lock, flags);
+ queue_work(mappass->wq, &mappass->register_work);
+ }
}
static int pvcalls_back_bind(struct xenbus_device *dev,
@@ -502,6 +525,56 @@ out_error:
static int pvcalls_back_poll(struct xenbus_device *dev,
struct xen_pvcalls_request *req)
{
+ struct pvcalls_fedata *fedata;
+ struct sockpass_mapping *mappass;
+ struct xen_pvcalls_response *rsp;
+ struct inet_connection_sock *icsk;
+ struct request_sock_queue *queue;
+ unsigned long flags;
+ int ret;
+ bool data;
+
+ fedata = dev_get_drvdata(&dev->dev);
+
+ down(&fedata->socket_lock);
+ mappass = radix_tree_lookup(&fedata->socketpass_mappings,
+ req->u.poll.id);
+ up(&fedata->socket_lock);
+ if (mappass == NULL)
+ return -EINVAL;
+
+ /*
+ * Limitation of the current implementation: only support one
+ * concurrent accept or poll call on one socket.
+ */
+ spin_lock_irqsave(&mappass->copy_lock, flags);
+ if (mappass->reqcopy.cmd != 0) {
+ ret = -EINTR;
+ goto out;
+ }
+
+ mappass->reqcopy = *req;
+ icsk = inet_csk(mappass->sock->sk);
+ queue = &icsk->icsk_accept_queue;
+ data = queue->rskq_accept_head != NULL;
+ if (data) {
+ mappass->reqcopy.cmd = 0;
+ ret = 0;
+ goto out;
+ }
+ spin_unlock_irqrestore(&mappass->copy_lock, flags);
+
+ /* Tell the caller we don't need to send back a notification yet */
+ return -1;
+
+out:
+ spin_unlock_irqrestore(&mappass->copy_lock, flags);
+
+ rsp = RING_GET_RESPONSE(&fedata->ring, fedata->ring.rsp_prod_pvt++);
+ rsp->req_id = req->req_id;
+ rsp->cmd = req->cmd;
+ rsp->u.poll.id = req->u.poll.id;
+ rsp->ret = ret;
return 0;
}