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22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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33 * version: DPDK.L.1.2.3-3
43 #include <sys/queue.h>
45 #include <rte_debug.h>
46 #include <rte_atomic.h>
47 #include <rte_launch.h>
49 #include <rte_memory.h>
50 #include <rte_memzone.h>
51 #include <rte_per_lcore.h>
52 #include <rte_tailq.h>
54 #include <rte_per_lcore.h>
55 #include <rte_lcore.h>
57 #include "eal_private.h"
58 #include "eal_thread.h"
60 RTE_DEFINE_PER_LCORE(unsigned, _lcore_id);
63 * Send a message to a slave lcore identified by slave_id to call a
64 * function f with argument arg. Once the execution is done, the
65 * remote lcore switch in FINISHED state.
68 rte_eal_remote_launch(int (*f)(void *), void *arg, unsigned slave_id)
72 int m2s = lcore_config[slave_id].pipe_master2slave[1];
73 int s2m = lcore_config[slave_id].pipe_slave2master[0];
75 if (lcore_config[slave_id].state != WAIT)
78 lcore_config[slave_id].f = f;
79 lcore_config[slave_id].arg = arg;
83 while (n == 0 || (n < 0 && errno == EINTR))
84 n = write(m2s, &c, 1);
86 rte_panic("cannot write on configuration pipe\n");
92 } while (n < 0 && errno == EINTR);
95 rte_panic("cannot read on configuration pipe\n");
100 /* set affinity for current thread */
102 eal_thread_set_affinity(void)
108 * According to the section VERSIONS of the CPU_ALLOC man page:
110 * The CPU_ZERO(), CPU_SET(), CPU_CLR(), and CPU_ISSET() macros were added
113 * CPU_COUNT() first appeared in glibc 2.6.
115 * CPU_AND(), CPU_OR(), CPU_XOR(), CPU_EQUAL(), CPU_ALLOC(),
116 * CPU_ALLOC_SIZE(), CPU_FREE(), CPU_ZERO_S(), CPU_SET_S(), CPU_CLR_S(),
117 * CPU_ISSET_S(), CPU_AND_S(), CPU_OR_S(), CPU_XOR_S(), and CPU_EQUAL_S()
118 * first appeared in glibc 2.7.
120 #if defined(CPU_ALLOC)
124 cpusetp = CPU_ALLOC(RTE_MAX_LCORE);
125 if (cpusetp == NULL) {
126 RTE_LOG(ERR, EAL, "CPU_ALLOC failed\n");
130 size = CPU_ALLOC_SIZE(RTE_MAX_LCORE);
131 CPU_ZERO_S(size, cpusetp);
132 CPU_SET_S(rte_lcore_id(), size, cpusetp);
134 thread = pthread_self();
135 s = pthread_setaffinity_np(thread, size, cpusetp);
137 RTE_LOG(ERR, EAL, "pthread_setaffinity_np failed\n");
143 #else /* CPU_ALLOC */
146 CPU_SET( rte_lcore_id(), &cpuset );
148 thread = pthread_self();
149 s = pthread_setaffinity_np(thread, sizeof( cpuset ), &cpuset);
151 RTE_LOG(ERR, EAL, "pthread_setaffinity_np failed\n");
158 void eal_thread_init_master(unsigned lcore_id)
160 /* set the lcore ID in per-lcore memory area */
161 RTE_PER_LCORE(_lcore_id) = lcore_id;
163 /* set CPU affinity */
164 if (eal_thread_set_affinity() < 0)
165 rte_panic("cannot set affinity\n");
168 /* main loop of threads */
169 __attribute__((noreturn)) void *
170 eal_thread_loop(__attribute__((unused)) void *arg)
178 thread_id = pthread_self();
180 /* retrieve our lcore_id from the configuration structure */
181 RTE_LCORE_FOREACH_SLAVE(lcore_id) {
182 if (thread_id == lcore_config[lcore_id].thread_id)
185 if (lcore_id == RTE_MAX_LCORE)
186 rte_panic("cannot retrieve lcore id\n");
188 RTE_LOG(DEBUG, EAL, "Core %u is ready (tid=%x)\n",
189 lcore_id, (int)thread_id);
191 m2s = lcore_config[lcore_id].pipe_master2slave[0];
192 s2m = lcore_config[lcore_id].pipe_slave2master[1];
194 /* set the lcore ID in per-lcore memory area */
195 RTE_PER_LCORE(_lcore_id) = lcore_id;
197 /* set CPU affinity */
198 if (eal_thread_set_affinity() < 0)
199 rte_panic("cannot set affinity\n");
201 /* read on our pipe to get commands */
208 n = read(m2s, &c, 1);
209 } while (n < 0 && errno == EINTR);
212 rte_panic("cannot read on configuration pipe\n");
214 lcore_config[lcore_id].state = RUNNING;
218 while (n == 0 || (n < 0 && errno == EINTR))
219 n = write(s2m, &c, 1);
221 rte_panic("cannot write on configuration pipe\n");
223 if (lcore_config[lcore_id].f == NULL)
224 rte_panic("NULL function pointer\n");
226 /* call the function and store the return value */
227 fct_arg = lcore_config[lcore_id].arg;
228 ret = lcore_config[lcore_id].f(fct_arg);
229 lcore_config[lcore_id].ret = ret;
231 lcore_config[lcore_id].state = FINISHED;
235 /* pthread_exit(NULL); */