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authorStefano Stabellini <sstabellini@kernel.org>2017-10-30 15:40:57 -0700
committerBoris Ostrovsky <boris.ostrovsky@oracle.com>2017-10-31 09:05:53 -0400
commit1853f11d72ed46310ff3c5a60264b2f8a53f8c25 (patch)
treeac37f6945916ffe0b4d0bb5f967b29d9e5b9b5d8 /drivers/xen/pvcalls-front.c
parent67ea9893cbc2f892f491ec620d6bbab262b80770 (diff)
xen/pvcalls: implement listen command
Send PVCALLS_LISTEN to the backend. Signed-off-by: Stefano Stabellini <stefano@aporeto.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> CC: boris.ostrovsky@oracle.com CC: jgross@suse.com Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Diffstat (limited to 'drivers/xen/pvcalls-front.c')
-rw-r--r--drivers/xen/pvcalls-front.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/drivers/xen/pvcalls-front.c b/drivers/xen/pvcalls-front.c
index 6e70ec3ea796..09b2a64fef91 100644
--- a/drivers/xen/pvcalls-front.c
+++ b/drivers/xen/pvcalls-front.c
@@ -412,6 +412,63 @@ int pvcalls_front_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
return 0;
}
+int pvcalls_front_listen(struct socket *sock, int backlog)
+{
+ struct pvcalls_bedata *bedata;
+ struct sock_mapping *map;
+ struct xen_pvcalls_request *req;
+ int notify, req_id, ret;
+
+ pvcalls_enter();
+ if (!pvcalls_front_dev) {
+ pvcalls_exit();
+ return -ENOTCONN;
+ }
+ bedata = dev_get_drvdata(&pvcalls_front_dev->dev);
+
+ map = (struct sock_mapping *) sock->sk->sk_send_head;
+ if (!map) {
+ pvcalls_exit();
+ return -ENOTSOCK;
+ }
+
+ if (map->passive.status != PVCALLS_STATUS_BIND) {
+ pvcalls_exit();
+ return -EOPNOTSUPP;
+ }
+
+ spin_lock(&bedata->socket_lock);
+ ret = get_request(bedata, &req_id);
+ if (ret < 0) {
+ spin_unlock(&bedata->socket_lock);
+ pvcalls_exit();
+ return ret;
+ }
+ req = RING_GET_REQUEST(&bedata->ring, req_id);
+ req->req_id = req_id;
+ req->cmd = PVCALLS_LISTEN;
+ req->u.listen.id = (uintptr_t) map;
+ req->u.listen.backlog = backlog;
+
+ bedata->ring.req_prod_pvt++;
+ RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&bedata->ring, notify);
+ spin_unlock(&bedata->socket_lock);
+ if (notify)
+ notify_remote_via_irq(bedata->irq);
+
+ wait_event(bedata->inflight_req,
+ READ_ONCE(bedata->rsp[req_id].req_id) == req_id);
+
+ /* read req_id, then the content */
+ smp_rmb();
+ ret = bedata->rsp[req_id].ret;
+ bedata->rsp[req_id].req_id = PVCALLS_INVALID_ID;
+
+ map->passive.status = PVCALLS_STATUS_LISTEN;
+ pvcalls_exit();
+ return ret;
+}
+
static const struct xenbus_device_id pvcalls_front_ids[] = {
{ "pvcalls" },
{ "" }