b4335e04e73caa7762cb7b2648b9973381993e40
[dpdk.git] / lib / librte_eal / common / eal_common_thread.c
1 /*-
2  *   BSD LICENSE
3  *
4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
5  *   All rights reserved.
6  *
7  *   Redistribution and use in source and binary forms, with or without
8  *   modification, are permitted provided that the following conditions
9  *   are met:
10  *
11  *     * Redistributions of source code must retain the above copyright
12  *       notice, this list of conditions and the following disclaimer.
13  *     * Redistributions in binary form must reproduce the above copyright
14  *       notice, this list of conditions and the following disclaimer in
15  *       the documentation and/or other materials provided with the
16  *       distribution.
17  *     * Neither the name of Intel Corporation nor the names of its
18  *       contributors may be used to endorse or promote products derived
19  *       from this software without specific prior written permission.
20  *
21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32  */
33
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <stdint.h>
37 #include <unistd.h>
38 #include <pthread.h>
39 #include <signal.h>
40 #include <sched.h>
41 #include <assert.h>
42 #include <string.h>
43
44 #include <rte_lcore.h>
45 #include <rte_memory.h>
46 #include <rte_log.h>
47
48 #include "eal_thread.h"
49
50 RTE_DECLARE_PER_LCORE(unsigned , _socket_id);
51
52 unsigned rte_socket_id(void)
53 {
54         return RTE_PER_LCORE(_socket_id);
55 }
56
57 int
58 rte_lcore_has_role(unsigned int lcore_id, enum rte_lcore_role_t role)
59 {
60         struct rte_config *cfg = rte_eal_get_configuration();
61
62         if (lcore_id >= RTE_MAX_LCORE)
63                 return -EINVAL;
64
65         if (cfg->lcore_role[lcore_id] == role)
66                 return 0;
67
68         return -EINVAL;
69 }
70
71 int eal_cpuset_socket_id(rte_cpuset_t *cpusetp)
72 {
73         unsigned cpu = 0;
74         int socket_id = SOCKET_ID_ANY;
75         int sid;
76
77         if (cpusetp == NULL)
78                 return SOCKET_ID_ANY;
79
80         do {
81                 if (!CPU_ISSET(cpu, cpusetp))
82                         continue;
83
84                 if (socket_id == SOCKET_ID_ANY)
85                         socket_id = eal_cpu_socket_id(cpu);
86
87                 sid = eal_cpu_socket_id(cpu);
88                 if (socket_id != sid) {
89                         socket_id = SOCKET_ID_ANY;
90                         break;
91                 }
92
93         } while (++cpu < RTE_MAX_LCORE);
94
95         return socket_id;
96 }
97
98 int
99 rte_thread_set_affinity(rte_cpuset_t *cpusetp)
100 {
101         int s;
102         unsigned lcore_id;
103         pthread_t tid;
104
105         tid = pthread_self();
106
107         s = pthread_setaffinity_np(tid, sizeof(rte_cpuset_t), cpusetp);
108         if (s != 0) {
109                 RTE_LOG(ERR, EAL, "pthread_setaffinity_np failed\n");
110                 return -1;
111         }
112
113         /* store socket_id in TLS for quick access */
114         RTE_PER_LCORE(_socket_id) =
115                 eal_cpuset_socket_id(cpusetp);
116
117         /* store cpuset in TLS for quick access */
118         memmove(&RTE_PER_LCORE(_cpuset), cpusetp,
119                 sizeof(rte_cpuset_t));
120
121         lcore_id = rte_lcore_id();
122         if (lcore_id != (unsigned)LCORE_ID_ANY) {
123                 /* EAL thread will update lcore_config */
124                 lcore_config[lcore_id].socket_id = RTE_PER_LCORE(_socket_id);
125                 memmove(&lcore_config[lcore_id].cpuset, cpusetp,
126                         sizeof(rte_cpuset_t));
127         }
128
129         return 0;
130 }
131
132 void
133 rte_thread_get_affinity(rte_cpuset_t *cpusetp)
134 {
135         assert(cpusetp);
136         memmove(cpusetp, &RTE_PER_LCORE(_cpuset),
137                 sizeof(rte_cpuset_t));
138 }
139
140 int
141 eal_thread_dump_affinity(char *str, unsigned size)
142 {
143         rte_cpuset_t cpuset;
144         unsigned cpu;
145         int ret;
146         unsigned int out = 0;
147
148         rte_thread_get_affinity(&cpuset);
149
150         for (cpu = 0; cpu < RTE_MAX_LCORE; cpu++) {
151                 if (!CPU_ISSET(cpu, &cpuset))
152                         continue;
153
154                 ret = snprintf(str + out,
155                                size - out, "%u,", cpu);
156                 if (ret < 0 || (unsigned)ret >= size - out) {
157                         /* string will be truncated */
158                         ret = -1;
159                         goto exit;
160                 }
161
162                 out += ret;
163         }
164
165         ret = 0;
166 exit:
167         /* remove the last separator */
168         if (out > 0)
169                 str[out - 1] = '\0';
170
171         return ret;
172 }
173
174
175 struct rte_thread_ctrl_params {
176         void *(*start_routine)(void *);
177         void *arg;
178         pthread_barrier_t launched;
179         pthread_barrier_t configured;
180 };
181
182 static void *rte_thread_init(void *arg)
183 {
184         struct rte_thread_ctrl_params *params = arg;
185         void *(*start_routine)(void *) = params->start_routine;
186         void *routine_arg = params->arg;
187
188         pthread_barrier_wait(&params->launched);
189         pthread_barrier_wait(&params->configured);
190
191         return start_routine(routine_arg);
192 }
193
194 int rte_ctrl_thread_create(pthread_t *thread, const char *name,
195                         const pthread_attr_t *attr,
196                         void *(*start_routine)(void *), void *arg)
197 {
198         struct rte_thread_ctrl_params params = {
199                 .start_routine = start_routine,
200                 .arg = arg,
201         };
202         int ret;
203
204         pthread_barrier_init(&params.launched, NULL, 2);
205         pthread_barrier_init(&params.configured, NULL, 2);
206
207         ret = pthread_create(thread, attr, rte_thread_init, (void *)&params);
208         if (ret != 0)
209                 return ret;
210
211         pthread_barrier_wait(&params.launched);
212
213         if (name != NULL) {
214                 ret = rte_thread_setname(*thread, name);
215                 if (ret < 0)
216                         goto fail;
217         }
218
219         pthread_barrier_wait(&params.configured);
220
221         return 0;
222
223 fail:
224         pthread_kill(*thread, SIGTERM);
225         pthread_join(*thread, NULL);
226         return ret;
227 }