1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2014 Intel Corporation
11 * API for lcore and socket manipulation
14 #include <rte_config.h>
15 #include <rte_per_lcore.h>
17 #include <rte_launch.h>
23 #define LCORE_ID_ANY UINT32_MAX /**< Any lcore. */
25 RTE_DECLARE_PER_LCORE(unsigned, _lcore_id); /**< Per thread "lcore id". */
26 RTE_DECLARE_PER_LCORE(rte_cpuset_t, _cpuset); /**< Per thread "cpuset". */
29 * Return the Application thread ID of the execution unit.
31 * Note: in most cases the lcore id returned here will also correspond
32 * to the processor id of the CPU on which the thread is pinned, this
33 * will not be the case if the user has explicitly changed the thread to
34 * core affinities using --lcores EAL argument e.g. --lcores '(0-3)@10'
35 * to run threads with lcore IDs 0, 1, 2 and 3 on physical core 10..
38 * Logical core ID (in EAL thread) or LCORE_ID_ANY (in non-EAL thread)
40 static inline unsigned
43 return RTE_PER_LCORE(_lcore_id);
47 * Get the id of the master lcore
50 * the id of the master lcore
52 unsigned int rte_get_master_lcore(void);
55 * Return the number of execution units (lcores) on the system.
58 * the number of execution units (lcores) on the system.
60 unsigned int rte_lcore_count(void);
63 * Return the index of the lcore starting from zero.
65 * When option -c or -l is given, the index corresponds
66 * to the order in the list.
68 * -c 0x30, lcore 4 has index 0, and 5 has index 1.
69 * -l 22,18 lcore 22 has index 0, and 18 has index 1.
72 * The targeted lcore, or -1 for the current one.
74 * The relative index, or -1 if not enabled.
76 int rte_lcore_index(int lcore_id);
79 * Return the ID of the physical socket of the logical core we are
82 * the ID of current lcoreid's physical socket
84 unsigned int rte_socket_id(void);
87 * Return number of physical sockets detected on the system.
89 * Note that number of nodes may not be correspondent to their physical id's:
90 * for example, a system may report two socket id's, but the actual socket id's
94 * the number of physical sockets as recognized by EAL
97 rte_socket_count(void);
100 * Return socket id with a particular index.
102 * This will return socket id at a particular position in list of all detected
103 * physical socket id's. For example, on a machine with sockets [0, 8], passing
104 * 1 as a parameter will return 8.
107 * index of physical socket id to return
110 * - physical socket id as recognized by EAL
111 * - -1 on error, with errno set to EINVAL
114 rte_socket_id_by_idx(unsigned int idx);
117 * Get the ID of the physical socket of the specified lcore
120 * the targeted lcore, which MUST be between 0 and RTE_MAX_LCORE-1.
122 * the ID of lcoreid's physical socket
125 rte_lcore_to_socket_id(unsigned int lcore_id);
129 * @b EXPERIMENTAL: this API may change without prior notice.
131 * Return the id of the lcore on a socket starting from zero.
134 * The targeted lcore, or -1 for the current one.
136 * The relative index, or -1 if not enabled.
140 rte_lcore_to_cpu_id(int lcore_id);
144 * @b EXPERIMENTAL: this API may change without prior notice.
146 * Return the cpuset for a given lcore.
148 * the targeted lcore, which MUST be between 0 and RTE_MAX_LCORE-1.
150 * The cpuset of that lcore
154 rte_lcore_cpuset(unsigned int lcore_id);
157 * Test if an lcore is enabled.
160 * The identifier of the lcore, which MUST be between 0 and
163 * True if the given lcore is enabled; false otherwise.
165 int rte_lcore_is_enabled(unsigned int lcore_id);
168 * Get the next enabled lcore ID.
171 * The current lcore (reference).
173 * If true, do not return the ID of the master lcore.
175 * If true, go back to 0 when RTE_MAX_LCORE is reached; otherwise,
176 * return RTE_MAX_LCORE.
178 * The next lcore_id or RTE_MAX_LCORE if not found.
180 unsigned int rte_get_next_lcore(unsigned int i, int skip_master, int wrap);
183 * Macro to browse all running lcores.
185 #define RTE_LCORE_FOREACH(i) \
186 for (i = rte_get_next_lcore(-1, 0, 0); \
188 i = rte_get_next_lcore(i, 0, 0))
191 * Macro to browse all running lcores except the master lcore.
193 #define RTE_LCORE_FOREACH_SLAVE(i) \
194 for (i = rte_get_next_lcore(-1, 1, 0); \
196 i = rte_get_next_lcore(i, 1, 0))
199 * Set core affinity of the current thread.
200 * Support both EAL and non-EAL thread and update TLS.
203 * Point to cpu_set_t for setting current thread affinity.
205 * On success, return 0; otherwise return -1;
207 int rte_thread_set_affinity(rte_cpuset_t *cpusetp);
210 * Get core affinity of the current thread.
213 * Point to cpu_set_t for getting current thread cpu affinity.
214 * It presumes input is not NULL, otherwise it causes panic.
217 void rte_thread_get_affinity(rte_cpuset_t *cpusetp);
222 * @note It fails with glibc < 2.12.
227 * Thread name to set.
229 * On success, return 0; otherwise return a negative value.
231 int rte_thread_setname(pthread_t id, const char *name);
234 * Create a control thread.
236 * Wrapper to pthread_create(), pthread_setname_np() and
237 * pthread_setaffinity_np(). The affinity of the new thread is based
238 * on the CPU affinity retrieved at the time rte_eal_init() was called,
239 * the dataplane and service lcores are then excluded.
242 * Filled with the thread id of the new created thread.
244 * The name of the control thread (max 16 characters including '\0').
246 * Attributes for the new thread.
247 * @param start_routine
248 * Function to be executed by the new thread.
250 * Argument passed to start_routine.
252 * On success, returns 0; on error, it returns a negative value
253 * corresponding to the error number.
256 rte_ctrl_thread_create(pthread_t *thread, const char *name,
257 const pthread_attr_t *attr,
258 void *(*start_routine)(void *), void *arg);
261 * Test if the core supplied has a specific role
264 * The identifier of the lcore, which MUST be between 0 and
267 * The role to be checked against.
269 * Boolean value: positive if test is true; otherwise returns 0.
272 rte_lcore_has_role(unsigned int lcore_id, enum rte_lcore_role_t role);
279 #endif /* _RTE_LCORE_H_ */