1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2019 Intel Corporation
3 */
4
5 #include <io.h>
6
7 #include <rte_atomic.h>
8 #include <rte_debug.h>
9 #include <rte_launch.h>
10 #include <rte_lcore.h>
11 #include <rte_per_lcore.h>
12 #include <rte_common.h>
13 #include <rte_memory.h>
14 #include <eal_thread.h>
15
16 #include "eal_private.h"
17 #include "eal_windows.h"
18
19 /*
20 * Send a message to a worker lcore identified by worker_id to call a
21 * function f with argument arg. Once the execution is done, the
22 * remote lcore switch in FINISHED state.
23 */
24 int
rte_eal_remote_launch(lcore_function_t * f,void * arg,unsigned int worker_id)25 rte_eal_remote_launch(lcore_function_t *f, void *arg, unsigned int worker_id)
26 {
27 int n;
28 char c = 0;
29 int m2w = lcore_config[worker_id].pipe_main2worker[1];
30 int w2m = lcore_config[worker_id].pipe_worker2main[0];
31
32 if (lcore_config[worker_id].state != WAIT)
33 return -EBUSY;
34
35 lcore_config[worker_id].f = f;
36 lcore_config[worker_id].arg = arg;
37
38 /* send message */
39 n = 0;
40 while (n == 0 || (n < 0 && errno == EINTR))
41 n = _write(m2w, &c, 1);
42 if (n < 0)
43 rte_panic("cannot write on configuration pipe\n");
44
45 /* wait ack */
46 do {
47 n = _read(w2m, &c, 1);
48 } while (n < 0 && errno == EINTR);
49
50 if (n <= 0)
51 rte_panic("cannot read on configuration pipe\n");
52
53 return 0;
54 }
55
56 /* main loop of threads */
57 void *
eal_thread_loop(void * arg __rte_unused)58 eal_thread_loop(void *arg __rte_unused)
59 {
60 char c;
61 int n, ret;
62 unsigned int lcore_id;
63 pthread_t thread_id;
64 int m2w, w2m;
65 char cpuset[RTE_CPU_AFFINITY_STR_LEN];
66
67 thread_id = pthread_self();
68
69 /* retrieve our lcore_id from the configuration structure */
70 RTE_LCORE_FOREACH_WORKER(lcore_id) {
71 if (thread_id == lcore_config[lcore_id].thread_id)
72 break;
73 }
74 if (lcore_id == RTE_MAX_LCORE)
75 rte_panic("cannot retrieve lcore id\n");
76
77 m2w = lcore_config[lcore_id].pipe_main2worker[0];
78 w2m = lcore_config[lcore_id].pipe_worker2main[1];
79
80 __rte_thread_init(lcore_id, &lcore_config[lcore_id].cpuset);
81
82 RTE_LOG(DEBUG, EAL, "lcore %u is ready (tid=%zx;cpuset=[%s])\n",
83 lcore_id, (uintptr_t)thread_id, cpuset);
84
85 /* read on our pipe to get commands */
86 while (1) {
87 void *fct_arg;
88
89 /* wait command */
90 do {
91 n = _read(m2w, &c, 1);
92 } while (n < 0 && errno == EINTR);
93
94 if (n <= 0)
95 rte_panic("cannot read on configuration pipe\n");
96
97 lcore_config[lcore_id].state = RUNNING;
98
99 /* send ack */
100 n = 0;
101 while (n == 0 || (n < 0 && errno == EINTR))
102 n = _write(w2m, &c, 1);
103 if (n < 0)
104 rte_panic("cannot write on configuration pipe\n");
105
106 if (lcore_config[lcore_id].f == NULL)
107 rte_panic("NULL function pointer\n");
108
109 /* call the function and store the return value */
110 fct_arg = lcore_config[lcore_id].arg;
111 ret = lcore_config[lcore_id].f(fct_arg);
112 lcore_config[lcore_id].ret = ret;
113 rte_wmb();
114
115 /* when a service core returns, it should go directly to WAIT
116 * state, because the application will not lcore_wait() for it.
117 */
118 if (lcore_config[lcore_id].core_role == ROLE_SERVICE)
119 lcore_config[lcore_id].state = WAIT;
120 else
121 lcore_config[lcore_id].state = FINISHED;
122 }
123 }
124
125 /* function to create threads */
126 int
eal_thread_create(pthread_t * thread)127 eal_thread_create(pthread_t *thread)
128 {
129 HANDLE th;
130
131 th = CreateThread(NULL, 0,
132 (LPTHREAD_START_ROUTINE)(ULONG_PTR)eal_thread_loop,
133 NULL, 0, (LPDWORD)thread);
134 if (!th)
135 return -1;
136
137 SetPriorityClass(GetCurrentProcess(), REALTIME_PRIORITY_CLASS);
138 SetThreadPriority(th, THREAD_PRIORITY_TIME_CRITICAL);
139
140 return 0;
141 }
142
143 /* get current thread ID */
144 int
rte_sys_gettid(void)145 rte_sys_gettid(void)
146 {
147 return GetCurrentThreadId();
148 }
149
150 int
rte_thread_setname(__rte_unused pthread_t id,__rte_unused const char * name)151 rte_thread_setname(__rte_unused pthread_t id, __rte_unused const char *name)
152 {
153 /* TODO */
154 /* This is a stub, not the expected result */
155 return 0;
156 }
157