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40 #include <pthread_np.h>
41 #include <sys/queue.h>
44 #include <rte_debug.h>
45 #include <rte_atomic.h>
46 #include <rte_launch.h>
48 #include <rte_memory.h>
49 #include <rte_memzone.h>
50 #include <rte_per_lcore.h>
51 #include <rte_tailq.h>
53 #include <rte_per_lcore.h>
54 #include <rte_lcore.h>
56 #include "eal_private.h"
57 #include "eal_thread.h"
59 RTE_DEFINE_PER_LCORE(unsigned, _lcore_id);
62 * Send a message to a slave lcore identified by slave_id to call a
63 * function f with argument arg. Once the execution is done, the
64 * remote lcore switch in FINISHED state.
67 rte_eal_remote_launch(int (*f)(void *), void *arg, unsigned slave_id)
71 int m2s = lcore_config[slave_id].pipe_master2slave[1];
72 int s2m = lcore_config[slave_id].pipe_slave2master[0];
74 if (lcore_config[slave_id].state != WAIT)
77 lcore_config[slave_id].f = f;
78 lcore_config[slave_id].arg = arg;
82 while (n == 0 || (n < 0 && errno == EINTR))
83 n = write(m2s, &c, 1);
85 rte_panic("cannot write on configuration pipe\n");
90 } while (n < 0 && errno == EINTR);
93 rte_panic("cannot read on configuration pipe\n");
98 /* set affinity for current thread */
100 eal_thread_set_affinity(void)
106 * According to the section VERSIONS of the CPU_ALLOC man page:
108 * The CPU_ZERO(), CPU_SET(), CPU_CLR(), and CPU_ISSET() macros were added
111 * CPU_COUNT() first appeared in glibc 2.6.
113 * CPU_AND(), CPU_OR(), CPU_XOR(), CPU_EQUAL(), CPU_ALLOC(),
114 * CPU_ALLOC_SIZE(), CPU_FREE(), CPU_ZERO_S(), CPU_SET_S(), CPU_CLR_S(),
115 * CPU_ISSET_S(), CPU_AND_S(), CPU_OR_S(), CPU_XOR_S(), and CPU_EQUAL_S()
116 * first appeared in glibc 2.7.
118 #if defined(CPU_ALLOC)
122 cpusetp = CPU_ALLOC(RTE_MAX_LCORE);
123 if (cpusetp == NULL) {
124 RTE_LOG(ERR, EAL, "CPU_ALLOC failed\n");
128 size = CPU_ALLOC_SIZE(RTE_MAX_LCORE);
129 CPU_ZERO_S(size, cpusetp);
130 CPU_SET_S(rte_lcore_id(), size, cpusetp);
132 thread = pthread_self();
133 s = pthread_setaffinity_np(thread, size, cpusetp);
135 RTE_LOG(ERR, EAL, "pthread_setaffinity_np failed\n");
141 #else /* CPU_ALLOC */
144 CPU_SET( rte_lcore_id(), &cpuset );
146 thread = pthread_self();
147 s = pthread_setaffinity_np(thread, sizeof( cpuset ), &cpuset);
149 RTE_LOG(ERR, EAL, "pthread_setaffinity_np failed\n");
156 void eal_thread_init_master(unsigned lcore_id)
158 /* set the lcore ID in per-lcore memory area */
159 RTE_PER_LCORE(_lcore_id) = lcore_id;
161 /* set CPU affinity */
162 if (eal_thread_set_affinity() < 0)
163 rte_panic("cannot set affinity\n");
166 /* main loop of threads */
167 __attribute__((noreturn)) void *
168 eal_thread_loop(__attribute__((unused)) void *arg)
176 thread_id = pthread_self();
178 /* retrieve our lcore_id from the configuration structure */
179 RTE_LCORE_FOREACH_SLAVE(lcore_id) {
180 if (thread_id == lcore_config[lcore_id].thread_id)
183 if (lcore_id == RTE_MAX_LCORE)
184 rte_panic("cannot retrieve lcore id\n");
186 RTE_LOG(DEBUG, EAL, "Core %u is ready (tid=%p)\n",
187 lcore_id, thread_id);
189 m2s = lcore_config[lcore_id].pipe_master2slave[0];
190 s2m = lcore_config[lcore_id].pipe_slave2master[1];
192 /* set the lcore ID in per-lcore memory area */
193 RTE_PER_LCORE(_lcore_id) = lcore_id;
195 /* set CPU affinity */
196 if (eal_thread_set_affinity() < 0)
197 rte_panic("cannot set affinity\n");
199 /* read on our pipe to get commands */
205 n = read(m2s, &c, 1);
206 } while (n < 0 && errno == EINTR);
209 rte_panic("cannot read on configuration pipe\n");
211 lcore_config[lcore_id].state = RUNNING;
215 while (n == 0 || (n < 0 && errno == EINTR))
216 n = write(s2m, &c, 1);
218 rte_panic("cannot write on configuration pipe\n");
220 if (lcore_config[lcore_id].f == NULL)
221 rte_panic("NULL function pointer\n");
223 /* call the function and store the return value */
224 fct_arg = lcore_config[lcore_id].arg;
225 ret = lcore_config[lcore_id].f(fct_arg);
226 lcore_config[lcore_id].ret = ret;
228 lcore_config[lcore_id].state = FINISHED;
232 /* pthread_exit(NULL); */
236 /* require calling thread tid by gettid() */
237 int rte_sys_gettid(void)