aboutsummaryrefslogtreecommitdiffstats
path: root/lib/librte_eal/common/include/rte_launch.h
blob: dd1946da0f0b42e093e0241d12237ca2cb3d2443 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of Intel Corporation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _RTE_LAUNCH_H_
#define _RTE_LAUNCH_H_

/**
 * @file
 *
 * Launch tasks on other lcores
 */

#ifdef __cplusplus
extern "C" {
#endif

/**
 * State of an lcore.
 */
enum rte_lcore_state_t {
	WAIT,       /**< waiting a new command */
	RUNNING,    /**< executing command */
	FINISHED,   /**< command executed */
};

/**
 * Definition of a remote launch function.
 */
typedef int (lcore_function_t)(void *);

/**
 * Launch a function on another lcore.
 *
 * To be executed on the MASTER lcore only.
 *
 * Sends a message to a slave lcore (identified by the slave_id) that
 * is in the WAIT state (this is true after the first call to
 * rte_eal_init()). This can be checked by first calling
 * rte_eal_wait_lcore(slave_id).
 *
 * When the remote lcore receives the message, it switches to
 * the RUNNING state, then calls the function f with argument arg. Once the
 * execution is done, the remote lcore switches to a FINISHED state and
 * the return value of f is stored in a local variable to be read using
 * rte_eal_wait_lcore().
 *
 * The MASTER lcore returns as soon as the message is sent and knows
 * nothing about the completion of f.
 *
 * Note: This function is not designed to offer optimum
 * performance. It is just a practical way to launch a function on
 * another lcore at initialization time.
 *
 * @param f
 *   The function to be called.
 * @param arg
 *   The argument for the function.
 * @param slave_id
 *   The identifier of the lcore on which the function should be executed.
 * @return
 *   - 0: Success. Execution of function f started on the remote lcore.
 *   - (-EBUSY): The remote lcore is not in a WAIT state.
 */
int rte_eal_remote_launch(lcore_function_t *f, void *arg, unsigned slave_id);

/**
 * This enum indicates whether the master core must execute the handler
 * launched on all logical cores.
 */
enum rte_rmt_call_master_t {
	SKIP_MASTER = 0, /**< lcore handler not executed by master core. */
	CALL_MASTER,     /**< lcore handler executed by master core. */
};

/**
 * Launch a function on all lcores.
 *
 * Check that each SLAVE lcore is in a WAIT state, then call
 * rte_eal_remote_launch() for each lcore.
 *
 * @param f
 *   The function to be called.
 * @param arg
 *   The argument for the function.
 * @param call_master
 *   If call_master set to SKIP_MASTER, the MASTER lcore does not call
 *   the function. If call_master is set to CALL_MASTER, the function
 *   is also called on master before returning. In any case, the master
 *   lcore returns as soon as it finished its job and knows nothing
 *   about the completion of f on the other lcores.
 * @return
 *   - 0: Success. Execution of function f started on all remote lcores.
 *   - (-EBUSY): At least one remote lcore is not in a WAIT state. In this
 *     case, no message is sent to any of the lcores.
 */
int rte_eal_mp_remote_launch(lcore_function_t *f, void *arg,
			     enum rte_rmt_call_master_t call_master);

/**
 * Get the state of the lcore identified by slave_id.
 *
 * To be executed on the MASTER lcore only.
 *
 * @param slave_id
 *   The identifier of the lcore.
 * @return
 *   The state of the lcore.
 */
enum rte_lcore_state_t rte_eal_get_lcore_state(unsigned slave_id);

/**
 * Wait until an lcore finishes its job.
 *
 * To be executed on the MASTER lcore only.
 *
 * If the slave lcore identified by the slave_id is in a FINISHED state,
 * switch to the WAIT state. If the lcore is in RUNNING state, wait until
 * the lcore finishes its job and moves to the FINISHED state.
 *
 * @param slave_id
 *   The identifier of the lcore.
 * @return
 *   - 0: If the lcore identified by the slave_id is in a WAIT state.
 *   - The value that was returned by the previous remote launch
 *     function call if the lcore identified by the slave_id was in a
 *     FINISHED or RUNNING state. In this case, it changes the state
 *     of the lcore to WAIT.
 */
int rte_eal_wait_lcore(unsigned slave_id);

/**
 * Wait until all lcores finish their jobs.
 *
 * To be executed on the MASTER lcore only. Issue an
 * rte_eal_wait_lcore() for every lcore. The return values are
 * ignored.
 *
 * After a call to rte_eal_mp_wait_lcore(), the caller can assume
 * that all slave lcores are in a WAIT state.
 */
void rte_eal_mp_wait_lcore(void);

#ifdef __cplusplus
}
#endif

#endif /* _RTE_LAUNCH_H_ */