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 #define RTE_CPU_AND(dst, src1, src2) CPU_AND(dst, src1, src2)
  28 #elif defined(__FreeBSD__)
  29 #include <pthread_np.h>
  30 typedef cpuset_t rte_cpuset_t;
  31 #define RTE_CPU_AND(dst, src1, src2) do \
  32 { \
  33         cpuset_t tmp; \
  34         CPU_COPY(src1, &tmp); \
  35         CPU_AND(&tmp, src2); \
  36         CPU_COPY(&tmp, dst); \
  37 } while (0)
  38 #endif
  39
  40 /**
  41  * Structure storing internal configuration (per-lcore)
  42  */
  43 struct lcore_config {
  44         unsigned detected;         /**< true if lcore was detected */
  45         pthread_t thread_id;       /**< pthread identifier */
  46         int pipe_master2slave[2];  /**< communication pipe with master */
  47         int pipe_slave2master[2];  /**< communication pipe with master */
  48         lcore_function_t * volatile f;         /**< function to call */
  49         void * volatile arg;       /**< argument of function */
  50         volatile int ret;          /**< return value of function */
  51         volatile enum rte_lcore_state_t state; /**< lcore state */
  52         unsigned socket_id;        /**< physical socket id for this lcore */
  53         unsigned core_id;          /**< core number on socket for this lcore */
  54         int core_index;            /**< relative index, starting from 0 */
  55         rte_cpuset_t cpuset;       /**< cpu set which the lcore affinity to */
  56         uint8_t core_role;         /**< role of core eg: OFF, RTE, SERVICE */
  57 };
  58
  59 /**
  60  * Internal configuration (per-lcore)
  61  */
  62 extern struct lcore_config lcore_config[RTE_MAX_LCORE];
  63
  64 RTE_DECLARE_PER_LCORE(unsigned, _lcore_id);  /**< Per thread "lcore id". */
  65 RTE_DECLARE_PER_LCORE(rte_cpuset_t, _cpuset); /**< Per thread "cpuset". */
  66
  67 /**
  68  * Return the Application thread ID of the execution unit.
  69  *
  70  * Note: in most cases the lcore id returned here will also correspond
  71  *   to the processor id of the CPU on which the thread is pinned, this
  72  *   will not be the case if the user has explicitly changed the thread to
  73  *   core affinities using --lcores EAL argument e.g. --lcores '(0-3)@10'
  74  *   to run threads with lcore IDs 0, 1, 2 and 3 on physical core 10..
  75  *
  76  * @return
  77  *  Logical core ID (in EAL thread) or LCORE_ID_ANY (in non-EAL thread)
  78  */
  79 static inline unsigned
  80 rte_lcore_id(void)
  81 {
  82         return RTE_PER_LCORE(_lcore_id);
  83 }
  84
  85 /**
  86  * Get the id of the master lcore
  87  *
  88  * @return
  89  *   the id of the master lcore
  90  */
  91 static inline unsigned
  92 rte_get_master_lcore(void)
  93 {
  94         return rte_eal_get_configuration()->master_lcore;
  95 }
  96
  97 /**
  98  * Return the number of execution units (lcores) on the system.
  99  *
 100  * @return
 101  *   the number of execution units (lcores) on the system.
 102  */
 103 static inline unsigned
 104 rte_lcore_count(void)
 105 {
 106         const struct rte_config *cfg = rte_eal_get_configuration();
 107         return cfg->lcore_count;
 108 }
 109
 110 /**
 111  * Return the index of the lcore starting from zero.
 112  *
 113  * When option -c or -l is given, the index corresponds
 114  * to the order in the list.
 115  * For example:
 116  * -c 0x30, lcore 4 has index 0, and 5 has index 1.
 117  * -l 22,18 lcore 22 has index 0, and 18 has index 1.
 118  *
 119  * @param lcore_id
 120  *   The targeted lcore, or -1 for the current one.
 121  * @return
 122  *   The relative index, or -1 if not enabled.
 123  */
 124 static inline int
 125 rte_lcore_index(int lcore_id)
 126 {
 127         if (lcore_id >= RTE_MAX_LCORE)
 128                 return -1;
 129         if (lcore_id < 0)
 130                 lcore_id = (int)rte_lcore_id();
 131         return lcore_config[lcore_id].core_index;
 132 }
 133
 134 /**
 135  * Return the ID of the physical socket of the logical core we are
 136  * running on.
 137  * @return
 138  *   the ID of current lcoreid's physical socket
 139  */
 140 unsigned rte_socket_id(void);
 141
 142 /**
 143  * Return number of physical sockets detected on the system.
 144  *
 145  * Note that number of nodes may not be correspondent to their physical id's:
 146  * for example, a system may report two socket id's, but the actual socket id's
 147  * may be 0 and 8.
 148  *
 149  * @return
 150  *   the number of physical sockets as recognized by EAL
 151  */
 152 unsigned int
 153 rte_socket_count(void);
 154
 155 /**
 156  * Return socket id with a particular index.
 157  *
 158  * This will return socket id at a particular position in list of all detected
 159  * physical socket id's. For example, on a machine with sockets [0, 8], passing
 160  * 1 as a parameter will return 8.
 161  *
 162  * @param idx
 163  *   index of physical socket id to return
 164  *
 165  * @return
 166  *   - physical socket id as recognized by EAL
 167  *   - -1 on error, with errno set to EINVAL
 168  */
 169 int
 170 rte_socket_id_by_idx(unsigned int idx);
 171
 172 /**
 173  * Get the ID of the physical socket of the specified lcore
 174  *
 175  * @param lcore_id
 176  *   the targeted lcore, which MUST be between 0 and RTE_MAX_LCORE-1.
 177  * @return
 178  *   the ID of lcoreid's physical socket
 179  */
 180 static inline unsigned
 181 rte_lcore_to_socket_id(unsigned lcore_id)
 182 {
 183         return lcore_config[lcore_id].socket_id;
 184 }
 185
 186 /**
 187  * Test if an lcore is enabled.
 188  *
 189  * @param lcore_id
 190  *   The identifier of the lcore, which MUST be between 0 and
 191  *   RTE_MAX_LCORE-1.
 192  * @return
 193  *   True if the given lcore is enabled; false otherwise.
 194  */
 195 static inline int
 196 rte_lcore_is_enabled(unsigned lcore_id)
 197 {
 198         struct rte_config *cfg = rte_eal_get_configuration();
 199         if (lcore_id >= RTE_MAX_LCORE)
 200                 return 0;
 201         return cfg->lcore_role[lcore_id] == ROLE_RTE;
 202 }
 203
 204 /**
 205  * Get the next enabled lcore ID.
 206  *
 207  * @param i
 208  *   The current lcore (reference).
 209  * @param skip_master
 210  *   If true, do not return the ID of the master lcore.
 211  * @param wrap
 212  *   If true, go back to 0 when RTE_MAX_LCORE is reached; otherwise,
 213  *   return RTE_MAX_LCORE.
 214  * @return
 215  *   The next lcore_id or RTE_MAX_LCORE if not found.
 216  */
 217 static inline unsigned
 218 rte_get_next_lcore(unsigned i, int skip_master, int wrap)
 219 {
 220         i++;
 221         if (wrap)
 222                 i %= RTE_MAX_LCORE;
 223
 224         while (i < RTE_MAX_LCORE) {
 225                 if (!rte_lcore_is_enabled(i) ||
 226                     (skip_master && (i == rte_get_master_lcore()))) {
 227                         i++;
 228                         if (wrap)
 229                                 i %= RTE_MAX_LCORE;
 230                         continue;
 231                 }
 232                 break;
 233         }
 234         return i;
 235 }
 236 /**
 237  * Macro to browse all running lcores.
 238  */
 239 #define RTE_LCORE_FOREACH(i)                                            \
 240         for (i = rte_get_next_lcore(-1, 0, 0);                          \
 241              i<RTE_MAX_LCORE;                                           \
 242              i = rte_get_next_lcore(i, 0, 0))
 243
 244 /**
 245  * Macro to browse all running lcores except the master lcore.
 246  */
 247 #define RTE_LCORE_FOREACH_SLAVE(i)                                      \
 248         for (i = rte_get_next_lcore(-1, 1, 0);                          \
 249              i<RTE_MAX_LCORE;                                           \
 250              i = rte_get_next_lcore(i, 1, 0))
 251
 252 /**
 253  * Set core affinity of the current thread.
 254  * Support both EAL and non-EAL thread and update TLS.
 255  *
 256  * @param cpusetp
 257  *   Point to cpu_set_t for setting current thread affinity.
 258  * @return
 259  *   On success, return 0; otherwise return -1;
 260  */
 261 int rte_thread_set_affinity(rte_cpuset_t *cpusetp);
 262
 263 /**
 264  * Get core affinity of the current thread.
 265  *
 266  * @param cpusetp
 267  *   Point to cpu_set_t for getting current thread cpu affinity.
 268  *   It presumes input is not NULL, otherwise it causes panic.
 269  *
 270  */
 271 void rte_thread_get_affinity(rte_cpuset_t *cpusetp);
 272
 273 /**
 274  * Set thread names.
 275  *
 276  * @note It fails with glibc < 2.12.
 277  *
 278  * @param id
 279  *   Thread id.
 280  * @param name
 281  *   Thread name to set.
 282  * @return
 283  *   On success, return 0; otherwise return a negative value.
 284  */
 285 int rte_thread_setname(pthread_t id, const char *name);
 286
 287 /**
 288  * Create a control thread.
 289  *
 290  * Wrapper to pthread_create(), pthread_setname_np() and
 291  * pthread_setaffinity_np(). The affinity of the new thread is based
 292  * on the CPU affinity retrieved at the time rte_eal_init() was called,
 293  * the dataplane and service lcores are then excluded.
 294  *
 295  * @param thread
 296  *   Filled with the thread id of the new created thread.
 297  * @param name
 298  *   The name of the control thread (max 16 characters including '\0').
 299  * @param attr
 300  *   Attributes for the new thread.
 301  * @param start_routine
 302  *   Function to be executed by the new thread.
 303  * @param arg
 304  *   Argument passed to start_routine.
 305  * @return
 306  *   On success, returns 0; on error, it returns a negative value
 307  *   corresponding to the error number.
 308  */
 309 int
 310 rte_ctrl_thread_create(pthread_t *thread, const char *name,
 311                 const pthread_attr_t *attr,
 312                 void *(*start_routine)(void *), void *arg);
 313
 314 /**
 315  * Test if the core supplied has a specific role
 316  *
 317  * @param lcore_id
 318  *   The identifier of the lcore, which MUST be between 0 and
 319  *   RTE_MAX_LCORE-1.
 320  * @param role
 321  *   The role to be checked against.
 322  * @return
 323  *   Boolean value: positive if test is true; otherwise returns 0.
 324  */
 325 int
 326 rte_lcore_has_role(unsigned int lcore_id, enum rte_lcore_role_t role);
 327
 328 #ifdef __cplusplus
 329 }
 330 #endif
 331
 332
 333 #endif /* _RTE_LCORE_H_ */