ceph/src/dpdk/examples/multi_process/l2fwd_fork/flib.h

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #ifndef __FLIB_H
  35 #define __FLIB_H
  36
  37 /* callback function pointer when specific slave leaves */
  38 typedef void (slave_exit_notify)(unsigned slaveid, int stat);
  39
  40 enum slave_stat{
  41         ST_FREEZE = 1,
  42         ST_IDLE,
  43         ST_RUN,
  44         ST_ZOMBIE,      /* Not implemented yet */
  45 };
  46
  47 /**
  48  * Initialize the fork lib.
  49  *
  50  * @return
  51  *    - 0 : fork lib initialized successfully
  52  *    - -1 : fork lib initialized failed
  53  */
  54 int flib_init(void);
  55
  56 /**
  57  * Check that every SLAVE lcores are in WAIT state, then call
  58  * flib_remote_launch() for all of them. If call_master is true
  59  * (set to CALL_MASTER), also call the function on the master lcore.
  60  *
  61  * @param f:
  62  *      function pointer need to run
  63  * @param arg:
  64  *      argument for f to carry
  65  * @param call_master
  66  *      - SKIP_MASTER : only launch function on slave lcores
  67  *      - CALL_MASTER : launch function on master and slave lcores
  68  * @return
  69  *    - 0 : function  execute successfully
  70  *    - -1 :  function  execute  failed
  71  */
  72 int flib_mp_remote_launch(lcore_function_t *f,
  73                 void *arg, enum rte_rmt_call_master_t call_master);
  74
  75 /**
  76  * Send a message to a slave lcore identified by slave_id to call a
  77  * function f with argument arg.
  78  *
  79  * @param f:
  80  *      function pointer need to run
  81  * @param arg:
  82  *      argument for f to carry
  83  * @param slave_id
  84  *      slave lcore id to run on
  85  * @return
  86  *    - 0 : function  execute successfully
  87  *    - -1 :  function  execute  failed
  88  */
  89 int flib_remote_launch(lcore_function_t *f,
  90                                         void *arg, unsigned slave_id);
  91
  92 /**
  93  * Query the running stat for specific slave, wont' work in with master id
  94  *
  95  * @param slave_id:
  96  *      lcore id which should not be master id
  97  * @return
  98  *    - ST_FREEZE : lcore is not in enabled core mask
  99  *       - ST_IDLE     : lcore is idle
 100  *    -  ST_RUN     : lcore is running something
 101  */
 102 enum slave_stat
 103 flib_query_slave_status(unsigned slave_id);
 104
 105 /**
 106  * Register a callback function to be notified in case specific slave exit.
 107  *
 108  * @param slave_id:
 109  *      lcore id which should not be master id
 110  * @param cb:
 111  *      callback pointer to register
 112  * @return
 113  *    - 0            :  function  execute successfully
 114  *    - -EFAULT  :  argument error
 115  *    - -ENOENT :  slave_id not correct
 116  */
 117 int flib_register_slave_exit_notify(unsigned slave_id,
 118         slave_exit_notify *cb);
 119
 120 /**
 121  * Assign a lcore ID to non-slave thread.  Non-slave thread refers to thread that
 122  * not created by function rte_eal_remote_launch or rte_eal_mp_remote_launch.
 123  * These threads can either bind lcore or float among differnt lcores.
 124  * This lcore ID will be unique in multi-thread or multi-process DPDK running
 125  * environment, then it can benefit from using the cache mechanism provided in
 126  * mempool library.
 127  * After calling successfully, use rte_lcore_id() to get the assigned lcore ID, but
 128  * other lcore funtions can't guarantee to work correctly.
 129  *
 130  * @return
 131  *   -    -1  : can't assign a lcore id with 3 possibilities.
 132  *                 - it's not non-slave thread.
 133  *                 - it had assign a lcore id previously
 134  *                 - the lcore id is running out.
 135  *   -  > 0 :  the assigned lcore id.
 136  */
 137 int flib_assign_lcore_id(void);
 138
 139 /**
 140  * Free the lcore_id that assigned in flib_assign_lcore_id().
 141  * call it in case non-slave thread is leaving or left.
 142  *
 143  * @param lcore_id
 144  * The identifier of the lcore, which MUST be between 1 and
 145  *   RTE_MAX_LCORE-1.
 146  */
 147 void flib_free_lcore_id(unsigned lcore_id);
 148
 149 #endif /* __FLIB_H  */