| /* |
| * Copyright (c) 2017 Cisco and/or its affiliates. |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at: |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <vnet/vnet.h> |
| #include <vnet/devices/dpdk/dpdk.h> |
| |
| |
| /* |
| * Called by the dpdk driver's rte_delay_us() function. |
| * Return 0 to have the dpdk do a regular delay loop. |
| * Return 1 if to skip the delay loop because we are suspending |
| * the calling vlib process instead. |
| */ |
| int |
| rte_delay_us_override (unsigned us) |
| { |
| vlib_main_t *vm; |
| |
| /* Don't bother intercepting for short delays */ |
| if (us < 10) |
| return 0; |
| |
| /* |
| * Only intercept if we are in a vlib process. |
| * If we are called from a vlib worker thread or the vlib main |
| * thread then do not intercept. (Must not be called from an |
| * independent pthread). |
| */ |
| if (os_get_cpu_number () == 0) |
| { |
| /* |
| * We're in the vlib main thread or a vlib process. Make sure |
| * the process is running and we're not still initializing. |
| */ |
| vm = vlib_get_main (); |
| if (vlib_in_process_context (vm)) |
| { |
| /* Only suspend for the admin_down_process */ |
| vlib_process_t *proc = vlib_get_current_process (vm); |
| if (!(proc->flags & VLIB_PROCESS_IS_RUNNING) || |
| (proc->node_runtime.function != admin_up_down_process)) |
| return 0; |
| |
| f64 delay = 1e-6 * us; |
| vlib_process_suspend (vm, delay); |
| return 1; |
| } |
| } |
| return 0; // no override |
| } |
| |
| static void |
| rte_delay_us_override_cb (unsigned us) |
| { |
| if (rte_delay_us_override (us) == 0) |
| rte_delay_us_block (us); |
| } |
| |
| static clib_error_t * dpdk_main_init (vlib_main_t * vm) |
| { |
| clib_error_t * error = 0; |
| |
| if ((error = vlib_call_init_function (vm, dpdk_init))) |
| return error; |
| |
| /* register custom delay function */ |
| rte_delay_us_callback_register (rte_delay_us_override_cb); |
| |
| return error; |
| } |
| |
| VLIB_INIT_FUNCTION (dpdk_main_init); |
| |