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1 | /* SPDX-License-Identifier: BSD-3-Clause |
2 | * Copyright(c) 2010-2014 Intel Corporation | |
7c673cae FG |
3 | */ |
4 | ||
5 | #include <errno.h> | |
6 | #include <stdio.h> | |
7 | #include <stdlib.h> | |
8 | #include <stdint.h> | |
9 | #include <unistd.h> | |
10 | #include <sched.h> | |
11 | #include <pthread_np.h> | |
12 | #include <sys/queue.h> | |
13 | #include <sys/thr.h> | |
14 | ||
15 | #include <rte_debug.h> | |
16 | #include <rte_atomic.h> | |
17 | #include <rte_launch.h> | |
18 | #include <rte_log.h> | |
19 | #include <rte_memory.h> | |
7c673cae FG |
20 | #include <rte_per_lcore.h> |
21 | #include <rte_eal.h> | |
7c673cae FG |
22 | #include <rte_lcore.h> |
23 | ||
24 | #include "eal_private.h" | |
25 | #include "eal_thread.h" | |
26 | ||
27 | RTE_DEFINE_PER_LCORE(unsigned, _lcore_id) = LCORE_ID_ANY; | |
28 | RTE_DEFINE_PER_LCORE(unsigned, _socket_id) = (unsigned)SOCKET_ID_ANY; | |
29 | RTE_DEFINE_PER_LCORE(rte_cpuset_t, _cpuset); | |
30 | ||
31 | /* | |
32 | * Send a message to a slave lcore identified by slave_id to call a | |
33 | * function f with argument arg. Once the execution is done, the | |
34 | * remote lcore switch in FINISHED state. | |
35 | */ | |
36 | int | |
37 | rte_eal_remote_launch(int (*f)(void *), void *arg, unsigned slave_id) | |
38 | { | |
39 | int n; | |
40 | char c = 0; | |
41 | int m2s = lcore_config[slave_id].pipe_master2slave[1]; | |
42 | int s2m = lcore_config[slave_id].pipe_slave2master[0]; | |
43 | ||
44 | if (lcore_config[slave_id].state != WAIT) | |
45 | return -EBUSY; | |
46 | ||
47 | lcore_config[slave_id].f = f; | |
48 | lcore_config[slave_id].arg = arg; | |
49 | ||
50 | /* send message */ | |
51 | n = 0; | |
52 | while (n == 0 || (n < 0 && errno == EINTR)) | |
53 | n = write(m2s, &c, 1); | |
54 | if (n < 0) | |
55 | rte_panic("cannot write on configuration pipe\n"); | |
56 | ||
57 | /* wait ack */ | |
58 | do { | |
59 | n = read(s2m, &c, 1); | |
60 | } while (n < 0 && errno == EINTR); | |
61 | ||
62 | if (n <= 0) | |
63 | rte_panic("cannot read on configuration pipe\n"); | |
64 | ||
65 | return 0; | |
66 | } | |
67 | ||
68 | /* set affinity for current thread */ | |
69 | static int | |
70 | eal_thread_set_affinity(void) | |
71 | { | |
72 | unsigned lcore_id = rte_lcore_id(); | |
73 | ||
74 | /* acquire system unique id */ | |
75 | rte_gettid(); | |
76 | ||
77 | /* update EAL thread core affinity */ | |
78 | return rte_thread_set_affinity(&lcore_config[lcore_id].cpuset); | |
79 | } | |
80 | ||
81 | void eal_thread_init_master(unsigned lcore_id) | |
82 | { | |
83 | /* set the lcore ID in per-lcore memory area */ | |
84 | RTE_PER_LCORE(_lcore_id) = lcore_id; | |
85 | ||
86 | /* set CPU affinity */ | |
87 | if (eal_thread_set_affinity() < 0) | |
88 | rte_panic("cannot set affinity\n"); | |
89 | } | |
90 | ||
91 | /* main loop of threads */ | |
92 | __attribute__((noreturn)) void * | |
93 | eal_thread_loop(__attribute__((unused)) void *arg) | |
94 | { | |
95 | char c; | |
96 | int n, ret; | |
97 | unsigned lcore_id; | |
98 | pthread_t thread_id; | |
99 | int m2s, s2m; | |
100 | char cpuset[RTE_CPU_AFFINITY_STR_LEN]; | |
101 | ||
102 | thread_id = pthread_self(); | |
103 | ||
104 | /* retrieve our lcore_id from the configuration structure */ | |
105 | RTE_LCORE_FOREACH_SLAVE(lcore_id) { | |
106 | if (thread_id == lcore_config[lcore_id].thread_id) | |
107 | break; | |
108 | } | |
109 | if (lcore_id == RTE_MAX_LCORE) | |
110 | rte_panic("cannot retrieve lcore id\n"); | |
111 | ||
112 | m2s = lcore_config[lcore_id].pipe_master2slave[0]; | |
113 | s2m = lcore_config[lcore_id].pipe_slave2master[1]; | |
114 | ||
115 | /* set the lcore ID in per-lcore memory area */ | |
116 | RTE_PER_LCORE(_lcore_id) = lcore_id; | |
117 | ||
118 | /* set CPU affinity */ | |
119 | if (eal_thread_set_affinity() < 0) | |
120 | rte_panic("cannot set affinity\n"); | |
121 | ||
11fdf7f2 | 122 | ret = eal_thread_dump_affinity(cpuset, sizeof(cpuset)); |
7c673cae FG |
123 | |
124 | RTE_LOG(DEBUG, EAL, "lcore %u is ready (tid=%p;cpuset=[%s%s])\n", | |
125 | lcore_id, thread_id, cpuset, ret == 0 ? "" : "..."); | |
126 | ||
127 | /* read on our pipe to get commands */ | |
128 | while (1) { | |
129 | void *fct_arg; | |
130 | ||
131 | /* wait command */ | |
132 | do { | |
133 | n = read(m2s, &c, 1); | |
134 | } while (n < 0 && errno == EINTR); | |
135 | ||
136 | if (n <= 0) | |
137 | rte_panic("cannot read on configuration pipe\n"); | |
138 | ||
139 | lcore_config[lcore_id].state = RUNNING; | |
140 | ||
141 | /* send ack */ | |
142 | n = 0; | |
143 | while (n == 0 || (n < 0 && errno == EINTR)) | |
144 | n = write(s2m, &c, 1); | |
145 | if (n < 0) | |
146 | rte_panic("cannot write on configuration pipe\n"); | |
147 | ||
148 | if (lcore_config[lcore_id].f == NULL) | |
149 | rte_panic("NULL function pointer\n"); | |
150 | ||
151 | /* call the function and store the return value */ | |
152 | fct_arg = lcore_config[lcore_id].arg; | |
153 | ret = lcore_config[lcore_id].f(fct_arg); | |
154 | lcore_config[lcore_id].ret = ret; | |
155 | rte_wmb(); | |
156 | lcore_config[lcore_id].state = FINISHED; | |
157 | } | |
158 | ||
159 | /* never reached */ | |
160 | /* pthread_exit(NULL); */ | |
161 | /* return NULL; */ | |
162 | } | |
163 | ||
164 | /* require calling thread tid by gettid() */ | |
165 | int rte_sys_gettid(void) | |
166 | { | |
167 | long lwpid; | |
168 | thr_self(&lwpid); | |
169 | return (int)lwpid; | |
170 | } | |
171 | ||
172 | int rte_thread_setname(pthread_t id, const char *name) | |
173 | { | |
174 | /* this BSD function returns no error */ | |
175 | pthread_set_name_np(id, name); | |
176 | return 0; | |
177 | } |