ceph/src/spdk/dpdk/lib/librte_eal/common/include/rte_lcore.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4
   5 #ifndef _RTE_LCORE_H_
   6 #define _RTE_LCORE_H_
   7
   8 /**
   9  * @file
  10  *
  11  * API for lcore and socket manipulation
  12  *
  13  */
  14 #include <rte_config.h>
  15 #include <rte_per_lcore.h>
  16 #include <rte_eal.h>
  17 #include <rte_launch.h>
  18
  19 #ifdef __cplusplus
  20 extern "C" {
  21 #endif
  22
  23 #define LCORE_ID_ANY     UINT32_MAX       /**< Any lcore. */
  24
  25 #if defined(__linux__)
  26         typedef cpu_set_t rte_cpuset_t;
  27 #elif defined(__FreeBSD__)
  28 #include <pthread_np.h>
  29         typedef cpuset_t rte_cpuset_t;
  30 #endif
  31
  32 /**
  33  * Structure storing internal configuration (per-lcore)
  34  */
  35 struct lcore_config {
  36         unsigned detected;         /**< true if lcore was detected */
  37         pthread_t thread_id;       /**< pthread identifier */
  38         int pipe_master2slave[2];  /**< communication pipe with master */
  39         int pipe_slave2master[2];  /**< communication pipe with master */
  40         lcore_function_t * volatile f;         /**< function to call */
  41         void * volatile arg;       /**< argument of function */
  42         volatile int ret;          /**< return value of function */
  43         volatile enum rte_lcore_state_t state; /**< lcore state */
  44         unsigned socket_id;        /**< physical socket id for this lcore */
  45         unsigned core_id;          /**< core number on socket for this lcore */
  46         int core_index;            /**< relative index, starting from 0 */
  47         rte_cpuset_t cpuset;       /**< cpu set which the lcore affinity to */
  48         uint8_t core_role;         /**< role of core eg: OFF, RTE, SERVICE */
  49 };
  50
  51 /**
  52  * Internal configuration (per-lcore)
  53  */
  54 extern struct lcore_config lcore_config[RTE_MAX_LCORE];
  55
  56 RTE_DECLARE_PER_LCORE(unsigned, _lcore_id);  /**< Per thread "lcore id". */
  57 RTE_DECLARE_PER_LCORE(rte_cpuset_t, _cpuset); /**< Per thread "cpuset". */
  58
  59 /**
  60  * Return the Application thread ID of the execution unit.
  61  *
  62  * Note: in most cases the lcore id returned here will also correspond
  63  *   to the processor id of the CPU on which the thread is pinned, this
  64  *   will not be the case if the user has explicitly changed the thread to
  65  *   core affinities using --lcores EAL argument e.g. --lcores '(0-3)@10'
  66  *   to run threads with lcore IDs 0, 1, 2 and 3 on physical core 10..
  67  *
  68  * @return
  69  *  Logical core ID (in EAL thread) or LCORE_ID_ANY (in non-EAL thread)
  70  */
  71 static inline unsigned
  72 rte_lcore_id(void)
  73 {
  74         return RTE_PER_LCORE(_lcore_id);
  75 }
  76
  77 /**
  78  * Get the id of the master lcore
  79  *
  80  * @return
  81  *   the id of the master lcore
  82  */
  83 static inline unsigned
  84 rte_get_master_lcore(void)
  85 {
  86         return rte_eal_get_configuration()->master_lcore;
  87 }
  88
  89 /**
  90  * Return the number of execution units (lcores) on the system.
  91  *
  92  * @return
  93  *   the number of execution units (lcores) on the system.
  94  */
  95 static inline unsigned
  96 rte_lcore_count(void)
  97 {
  98         const struct rte_config *cfg = rte_eal_get_configuration();
  99         return cfg->lcore_count;
 100 }
 101
 102 /**
 103  * Return the index of the lcore starting from zero.
 104  *
 105  * When option -c or -l is given, the index corresponds
 106  * to the order in the list.
 107  * For example:
 108  * -c 0x30, lcore 4 has index 0, and 5 has index 1.
 109  * -l 22,18 lcore 22 has index 0, and 18 has index 1.
 110  *
 111  * @param lcore_id
 112  *   The targeted lcore, or -1 for the current one.
 113  * @return
 114  *   The relative index, or -1 if not enabled.
 115  */
 116 static inline int
 117 rte_lcore_index(int lcore_id)
 118 {
 119         if (lcore_id >= RTE_MAX_LCORE)
 120                 return -1;
 121         if (lcore_id < 0)
 122                 lcore_id = (int)rte_lcore_id();
 123         return lcore_config[lcore_id].core_index;
 124 }
 125
 126 /**
 127  * Return the ID of the physical socket of the logical core we are
 128  * running on.
 129  * @return
 130  *   the ID of current lcoreid's physical socket
 131  */
 132 unsigned rte_socket_id(void);
 133
 134 /**
 135  * Return number of physical sockets detected on the system.
 136  *
 137  * Note that number of nodes may not be correspondent to their physical id's:
 138  * for example, a system may report two socket id's, but the actual socket id's
 139  * may be 0 and 8.
 140  *
 141  * @return
 142  *   the number of physical sockets as recognized by EAL
 143  */
 144 unsigned int __rte_experimental
 145 rte_socket_count(void);
 146
 147 /**
 148  * Return socket id with a particular index.
 149  *
 150  * This will return socket id at a particular position in list of all detected
 151  * physical socket id's. For example, on a machine with sockets [0, 8], passing
 152  * 1 as a parameter will return 8.
 153  *
 154  * @param idx
 155  *   index of physical socket id to return
 156  *
 157  * @return
 158  *   - physical socket id as recognized by EAL
 159  *   - -1 on error, with errno set to EINVAL
 160  */
 161 int __rte_experimental
 162 rte_socket_id_by_idx(unsigned int idx);
 163
 164 /**
 165  * Get the ID of the physical socket of the specified lcore
 166  *
 167  * @param lcore_id
 168  *   the targeted lcore, which MUST be between 0 and RTE_MAX_LCORE-1.
 169  * @return
 170  *   the ID of lcoreid's physical socket
 171  */
 172 static inline unsigned
 173 rte_lcore_to_socket_id(unsigned lcore_id)
 174 {
 175         return lcore_config[lcore_id].socket_id;
 176 }
 177
 178 /**
 179  * Test if an lcore is enabled.
 180  *
 181  * @param lcore_id
 182  *   The identifier of the lcore, which MUST be between 0 and
 183  *   RTE_MAX_LCORE-1.
 184  * @return
 185  *   True if the given lcore is enabled; false otherwise.
 186  */
 187 static inline int
 188 rte_lcore_is_enabled(unsigned lcore_id)
 189 {
 190         struct rte_config *cfg = rte_eal_get_configuration();
 191         if (lcore_id >= RTE_MAX_LCORE)
 192                 return 0;
 193         return cfg->lcore_role[lcore_id] == ROLE_RTE;
 194 }
 195
 196 /**
 197  * Get the next enabled lcore ID.
 198  *
 199  * @param i
 200  *   The current lcore (reference).
 201  * @param skip_master
 202  *   If true, do not return the ID of the master lcore.
 203  * @param wrap
 204  *   If true, go back to 0 when RTE_MAX_LCORE is reached; otherwise,
 205  *   return RTE_MAX_LCORE.
 206  * @return
 207  *   The next lcore_id or RTE_MAX_LCORE if not found.
 208  */
 209 static inline unsigned
 210 rte_get_next_lcore(unsigned i, int skip_master, int wrap)
 211 {
 212         i++;
 213         if (wrap)
 214                 i %= RTE_MAX_LCORE;
 215
 216         while (i < RTE_MAX_LCORE) {
 217                 if (!rte_lcore_is_enabled(i) ||
 218                     (skip_master && (i == rte_get_master_lcore()))) {
 219                         i++;
 220                         if (wrap)
 221                                 i %= RTE_MAX_LCORE;
 222                         continue;
 223                 }
 224                 break;
 225         }
 226         return i;
 227 }
 228 /**
 229  * Macro to browse all running lcores.
 230  */
 231 #define RTE_LCORE_FOREACH(i)                                            \
 232         for (i = rte_get_next_lcore(-1, 0, 0);                          \
 233              i<RTE_MAX_LCORE;                                           \
 234              i = rte_get_next_lcore(i, 0, 0))
 235
 236 /**
 237  * Macro to browse all running lcores except the master lcore.
 238  */
 239 #define RTE_LCORE_FOREACH_SLAVE(i)                                      \
 240         for (i = rte_get_next_lcore(-1, 1, 0);                          \
 241              i<RTE_MAX_LCORE;                                           \
 242              i = rte_get_next_lcore(i, 1, 0))
 243
 244 /**
 245  * Set core affinity of the current thread.
 246  * Support both EAL and non-EAL thread and update TLS.
 247  *
 248  * @param cpusetp
 249  *   Point to cpu_set_t for setting current thread affinity.
 250  * @return
 251  *   On success, return 0; otherwise return -1;
 252  */
 253 int rte_thread_set_affinity(rte_cpuset_t *cpusetp);
 254
 255 /**
 256  * Get core affinity of the current thread.
 257  *
 258  * @param cpusetp
 259  *   Point to cpu_set_t for getting current thread cpu affinity.
 260  *   It presumes input is not NULL, otherwise it causes panic.
 261  *
 262  */
 263 void rte_thread_get_affinity(rte_cpuset_t *cpusetp);
 264
 265 /**
 266  * Set thread names.
 267  *
 268  * @note It fails with glibc < 2.12.
 269  *
 270  * @param id
 271  *   Thread id.
 272  * @param name
 273  *   Thread name to set.
 274  * @return
 275  *   On success, return 0; otherwise return a negative value.
 276  */
 277 int rte_thread_setname(pthread_t id, const char *name);
 278
 279 /**
 280  * Create a control thread.
 281  *
 282  * Wrapper to pthread_create(), pthread_setname_np() and
 283  * pthread_setaffinity_np(). The dataplane and service lcores are
 284  * excluded from the affinity of the new thread.
 285  *
 286  * @param thread
 287  *   Filled with the thread id of the new created thread.
 288  * @param name
 289  *   The name of the control thread (max 16 characters including '\0').
 290  * @param attr
 291  *   Attributes for the new thread.
 292  * @param start_routine
 293  *   Function to be executed by the new thread.
 294  * @param arg
 295  *   Argument passed to start_routine.
 296  * @return
 297  *   On success, returns 0; on error, it returns a negative value
 298  *   corresponding to the error number.
 299  */
 300 __rte_experimental int
 301 rte_ctrl_thread_create(pthread_t *thread, const char *name,
 302                 const pthread_attr_t *attr,
 303                 void *(*start_routine)(void *), void *arg);
 304
 305 /**
 306  * Test if the core supplied has a specific role
 307  *
 308  * @param lcore_id
 309  *   The identifier of the lcore, which MUST be between 0 and
 310  *   RTE_MAX_LCORE-1.
 311  * @param role
 312  *   The role to be checked against.
 313  * @return
 314  *   Boolean value: positive if test is true; otherwise returns 0.
 315  */
 316 int
 317 rte_lcore_has_role(unsigned int lcore_id, enum rte_lcore_role_t role);
 318
 319 #ifdef __cplusplus
 320 }
 321 #endif
 322
 323
 324 #endif /* _RTE_LCORE_H_ */