ceph/src/seastar/dpdk/examples/l2fwd-keepalive/shm.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2016 Intel Corporation
   3  */
   4
   5 #define RTE_KEEPALIVE_SHM_NAME "/dpdk_keepalive_shm_name"
   6
   7 #define RTE_KEEPALIVE_SHM_ALIVE 1
   8 #define RTE_KEEPALIVE_SHM_DEAD 2
   9
  10 #include <fcntl.h>
  11 #include <string.h>
  12 #include <unistd.h>
  13 #include <sys/mman.h>
  14 #include <sys/stat.h>
  15 #include <semaphore.h>
  16 #include <rte_keepalive.h>
  17
  18 /**
  19  * Keepalive SHM structure.
  20  *
  21  * The shared memory allocated by the primary is this size, and contains the
  22  * information as contained within this struct. A secondary may open the SHM,
  23  * and read the contents.
  24  */
  25 struct rte_keepalive_shm {
  26         /** IPC semaphore. Posted when a core dies */
  27         sem_t core_died;
  28
  29         /**
  30          * Relayed status of each core.
  31          */
  32         enum rte_keepalive_state core_state[RTE_KEEPALIVE_MAXCORES];
  33
  34         /**
  35          * Last-seen-alive timestamps for the cores
  36          */
  37         uint64_t core_last_seen_times[RTE_KEEPALIVE_MAXCORES];
  38 };
  39
  40 /**
  41  * Create shared host memory keepalive object.
  42  * @return
  43  *  Pointer to SHM keepalive structure, or NULL on failure.
  44  */
  45 struct rte_keepalive_shm *rte_keepalive_shm_create(void);
  46
  47 /**
  48  * Relays state for given core
  49  * @param *shm
  50  *  Pointer to SHM keepalive structure.
  51  * @param id_core
  52  *  Id of core
  53  * @param core_state
  54  *  State of core
  55  * @param last_alive
  56  *  Last seen timestamp for core
  57  */
  58 void rte_keepalive_relayed_state(struct rte_keepalive_shm *shm,
  59         const int id_core, const enum rte_keepalive_state core_state,
  60         uint64_t last_alive);
  61
  62 /** Shutdown cleanup of shared host memory keepalive object.
  63  * @param *shm
  64  *  Pointer to SHM keepalive structure. May be NULL.
  65  *
  66  *  If *shm is NULL, this function will only attempt to remove the
  67  *  shared host memory handle and not unmap the underlying memory.
  68  */
  69 void rte_keepalive_shm_cleanup(struct rte_keepalive_shm *ka_shm);