FD.io VPP  v21.01.1
Vector Packet Processing
main.c
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1 /*
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:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
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.
14  */
15 
16 #include <unistd.h>
17 #include <sys/types.h>
18 #include <sys/stat.h>
19 #include <fcntl.h>
20 #include <linux/vfio.h>
21 #include <sys/ioctl.h>
22 
23 #include <vnet/vnet.h>
24 #include <vnet/plugin/plugin.h>
25 #include <dpdk/device/dpdk.h>
26 #include <vpp/app/version.h>
27 
28 /*
29  * Called by the dpdk driver's rte_delay_us() function.
30  * Return 0 to have the dpdk do a regular delay loop.
31  * Return 1 if to skip the delay loop because we are suspending
32  * the calling vlib process instead.
33  */
34 static int
35 rte_delay_us_override (unsigned us)
36 {
37  vlib_main_t *vm;
38 
39  /* Don't bother intercepting for short delays */
40  if (us < 10)
41  return 0;
42 
43  /*
44  * Only intercept if we are in a vlib process.
45  * If we are called from a vlib worker thread or the vlib main
46  * thread then do not intercept. (Must not be called from an
47  * independent pthread).
48  */
49  if (vlib_get_thread_index () == 0)
50  {
51  /*
52  * We're in the vlib main thread or a vlib process. Make sure
53  * the process is running and we're not still initializing.
54  */
55  vm = vlib_get_main ();
56  if (vlib_in_process_context (vm))
57  {
58  /* Only suspend for the admin_down_process */
60  if (!(proc->flags & VLIB_PROCESS_IS_RUNNING) ||
61  (proc->node_runtime.node_index !=
63  return 0;
64 
65  f64 delay = 1e-6 * us;
66  vlib_process_suspend (vm, delay);
67  return 1;
68  }
69  }
70  return 0; // no override
71 }
72 
73 static void
75 {
76  if (rte_delay_us_override (us) == 0)
77  rte_delay_us_block (us);
78 }
79 
81 {
82  dpdk_main_t * dm = &dpdk_main;
83  clib_error_t * error = 0;
84 
85  dm->vlib_main = vm;
86  dm->vnet_main = vnet_get_main ();
87 
88  /* register custom delay function */
89  rte_delay_us_callback_register (rte_delay_us_override_cb);
90 
91  return error;
92 }
93 
94 /* *INDENT-OFF* */
96 {
97  .runs_after = VLIB_INITS("dpdk_init"),
98 };
99 
101  .version = VPP_BUILD_VER,
102  .description = "Data Plane Development Kit (DPDK)",
103 };
104 /* *INDENT-ON* */
vlib_node_runtime_t node_runtime
Definition: node.h:551
dpdk_main_t dpdk_main
Definition: init.c:47
VLIB_PLUGIN_REGISTER()
vnet_main_t * vnet_get_main(void)
Definition: misc.c:46
static clib_error_t * dpdk_main_init(vlib_main_t *vm)
Definition: main.c:80
vlib_main_t * vm
Definition: in2out_ed.c:1580
double f64
Definition: types.h:142
static uword vlib_process_suspend(vlib_main_t *vm, f64 dt)
Suspend a vlib cooperative multi-tasking thread for a period of time.
Definition: node_funcs.h:482
#define VLIB_INIT_FUNCTION(x)
Definition: init.h:173
vlib_node_registration_t admin_up_down_process_node
(constructor) VLIB_REGISTER_NODE (admin_up_down_process_node)
Definition: device.c:763
#define VLIB_PROCESS_IS_RUNNING
Definition: node.h:571
static void rte_delay_us_override_cb(unsigned us)
Definition: main.c:74
Definition: cJSON.c:84
u32 node_index
Node index.
Definition: node.h:488
static_always_inline uword vlib_get_thread_index(void)
Definition: threads.h:219
static vlib_process_t * vlib_get_current_process(vlib_main_t *vm)
Definition: node_funcs.h:444
static int rte_delay_us_override(unsigned us)
Definition: main.c:35
static vlib_main_t * vlib_get_main(void)
Definition: global_funcs.h:23
u16 flags
Definition: node.h:564
static uword vlib_in_process_context(vlib_main_t *vm)
Definition: node_funcs.h:438
vnet_main_t * vnet_main
Definition: dpdk.h:348
#define VLIB_INITS(...)
Definition: init.h:357
vlib_main_t * vlib_main
Definition: dpdk.h:347