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41 #include <sys/queue.h>
43 #include <rte_debug.h>
44 #include <rte_atomic.h>
45 #include <rte_launch.h>
47 #include <rte_memory.h>
48 #include <rte_memzone.h>
49 #include <rte_per_lcore.h>
50 #include <rte_tailq.h>
52 #include <rte_per_lcore.h>
53 #include <rte_lcore.h>
55 #include "eal_private.h"
56 #include "eal_thread.h"
58 RTE_DEFINE_PER_LCORE(unsigned, _lcore_id);
61 * Send a message to a slave lcore identified by slave_id to call a
62 * function f with argument arg. Once the execution is done, the
63 * remote lcore switch in FINISHED state.
66 rte_eal_remote_launch(int (*f)(void *), void *arg, unsigned slave_id)
70 int m2s = lcore_config[slave_id].pipe_master2slave[1];
71 int s2m = lcore_config[slave_id].pipe_slave2master[0];
73 if (lcore_config[slave_id].state != WAIT)
76 lcore_config[slave_id].f = f;
77 lcore_config[slave_id].arg = arg;
81 while (n == 0 || (n < 0 && errno == EINTR))
82 n = write(m2s, &c, 1);
84 rte_panic("cannot write on configuration pipe\n");
89 } while (n < 0 && errno == EINTR);
92 rte_panic("cannot read on configuration pipe\n");
97 /* set affinity for current thread */
99 eal_thread_set_affinity(void)
105 * According to the section VERSIONS of the CPU_ALLOC man page:
107 * The CPU_ZERO(), CPU_SET(), CPU_CLR(), and CPU_ISSET() macros were added
110 * CPU_COUNT() first appeared in glibc 2.6.
112 * CPU_AND(), CPU_OR(), CPU_XOR(), CPU_EQUAL(), CPU_ALLOC(),
113 * CPU_ALLOC_SIZE(), CPU_FREE(), CPU_ZERO_S(), CPU_SET_S(), CPU_CLR_S(),
114 * CPU_ISSET_S(), CPU_AND_S(), CPU_OR_S(), CPU_XOR_S(), and CPU_EQUAL_S()
115 * first appeared in glibc 2.7.
117 #if defined(CPU_ALLOC)
121 cpusetp = CPU_ALLOC(RTE_MAX_LCORE);
122 if (cpusetp == NULL) {
123 RTE_LOG(ERR, EAL, "CPU_ALLOC failed\n");
127 size = CPU_ALLOC_SIZE(RTE_MAX_LCORE);
128 CPU_ZERO_S(size, cpusetp);
129 CPU_SET_S(rte_lcore_id(), size, cpusetp);
131 thread = pthread_self();
132 s = pthread_setaffinity_np(thread, size, cpusetp);
134 RTE_LOG(ERR, EAL, "pthread_setaffinity_np failed\n");
140 #else /* CPU_ALLOC */
143 CPU_SET( rte_lcore_id(), &cpuset );
145 thread = pthread_self();
146 s = pthread_setaffinity_np(thread, sizeof( cpuset ), &cpuset);
148 RTE_LOG(ERR, EAL, "pthread_setaffinity_np failed\n");
155 void eal_thread_init_master(unsigned lcore_id)
157 /* set the lcore ID in per-lcore memory area */
158 RTE_PER_LCORE(_lcore_id) = lcore_id;
160 /* set CPU affinity */
161 if (eal_thread_set_affinity() < 0)
162 rte_panic("cannot set affinity\n");
165 /* main loop of threads */
166 __attribute__((noreturn)) void *
167 eal_thread_loop(__attribute__((unused)) void *arg)
175 thread_id = pthread_self();
177 /* retrieve our lcore_id from the configuration structure */
178 RTE_LCORE_FOREACH_SLAVE(lcore_id) {
179 if (thread_id == lcore_config[lcore_id].thread_id)
182 if (lcore_id == RTE_MAX_LCORE)
183 rte_panic("cannot retrieve lcore id\n");
185 RTE_LOG(DEBUG, EAL, "Core %u is ready (tid=%x)\n",
186 lcore_id, (int)thread_id);
188 m2s = lcore_config[lcore_id].pipe_master2slave[0];
189 s2m = lcore_config[lcore_id].pipe_slave2master[1];
191 /* set the lcore ID in per-lcore memory area */
192 RTE_PER_LCORE(_lcore_id) = lcore_id;
194 /* set CPU affinity */
195 if (eal_thread_set_affinity() < 0)
196 rte_panic("cannot set affinity\n");
198 /* read on our pipe to get commands */
204 n = read(m2s, &c, 1);
205 } while (n < 0 && errno == EINTR);
208 rte_panic("cannot read on configuration pipe\n");
210 lcore_config[lcore_id].state = RUNNING;
214 while (n == 0 || (n < 0 && errno == EINTR))
215 n = write(s2m, &c, 1);
217 rte_panic("cannot write on configuration pipe\n");
219 if (lcore_config[lcore_id].f == NULL)
220 rte_panic("NULL function pointer\n");
222 /* call the function and store the return value */
223 fct_arg = lcore_config[lcore_id].arg;
224 ret = lcore_config[lcore_id].f(fct_arg);
225 lcore_config[lcore_id].ret = ret;
227 lcore_config[lcore_id].state = FINISHED;
231 /* pthread_exit(NULL); */