2 * Copyright (c) 2017 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #include <vnet/vnet.h>
17 #include <vnet/devices/dpdk/dpdk.h>
21 * Called by the dpdk driver's rte_delay_us() function.
22 * Return 0 to have the dpdk do a regular delay loop.
23 * Return 1 if to skip the delay loop because we are suspending
24 * the calling vlib process instead.
27 rte_delay_us_override (unsigned us)
31 /* Don't bother intercepting for short delays */
36 * Only intercept if we are in a vlib process.
37 * If we are called from a vlib worker thread or the vlib main
38 * thread then do not intercept. (Must not be called from an
39 * independent pthread).
41 if (os_get_cpu_number () == 0)
44 * We're in the vlib main thread or a vlib process. Make sure
45 * the process is running and we're not still initializing.
47 vm = vlib_get_main ();
48 if (vlib_in_process_context (vm))
50 /* Only suspend for the admin_down_process */
51 vlib_process_t *proc = vlib_get_current_process (vm);
52 if (!(proc->flags & VLIB_PROCESS_IS_RUNNING) ||
53 (proc->node_runtime.function != admin_up_down_process))
56 f64 delay = 1e-6 * us;
57 vlib_process_suspend (vm, delay);
61 return 0; // no override
65 rte_delay_us_override_cb (unsigned us)
67 if (rte_delay_us_override (us) == 0)
68 rte_delay_us_block (us);
71 static clib_error_t * dpdk_main_init (vlib_main_t * vm)
73 clib_error_t * error = 0;
75 if ((error = vlib_call_init_function (vm, dpdk_init)))
78 /* register custom delay function */
79 rte_delay_us_callback_register (rte_delay_us_override_cb);
84 VLIB_INIT_FUNCTION (dpdk_main_init);