+ /*
+ * Kernel creates the VXLAN devices and registers UDP ports to
+ * be hardware offloaded within the NIC kernel drivers. The
+ * registration process is being performed into context of
+ * working kernel thread and the race conditions might happen.
+ * The VXLAN device is created and success is returned to
+ * calling application, but the UDP port registration process
+ * is not completed yet. The next applied rule may be rejected
+ * by the driver with ENOSUP code. We are going to wait a bit,
+ * allowing registration process to be completed. The waiting
+ * is performed once after device been created.
+ */
+ do {
+ struct timespec onems;
+
+ ret = flow_tcf_nl_ack(ctx, nlh,
+ flow_tcf_collect_apply_cb, nlh);
+ if (!ret || ret != -ENOTSUP || !twait)
+ break;
+ /* Wait one millisecond and try again till timeout. */
+ onems.tv_sec = 0;
+ onems.tv_nsec = NS_PER_S / MS_PER_S;
+ nanosleep(&onems, 0);
+ if ((rte_get_timer_cycles() - start) > twait) {
+ /* Timeout elapsed, try once more and exit. */
+ twait = 0;
+ }
+ } while (true);
+ if (!ret) {
+ if (!tcm->tcm_handle) {
+ flow_tcf_remove(dev, flow);
+ return rte_flow_error_set
+ (error, ENOENT,
+ RTE_FLOW_ERROR_TYPE_UNSPECIFIED, NULL,
+ "netlink: rule zero handle returned");
+ }