summaryrefslogtreecommitdiff
path: root/lib/librte_eal/common/include/rte_bus.h
blob: b01930af5dbf4f1427aeb879d9f6c6bf26c5e3ac (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
/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2016 NXP
 *   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 NXP 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_BUS_H_
#define _RTE_BUS_H_

/**
 * @file
 *
 * DPDK device bus interface
 *
 * This file exposes API and interfaces for bus abstraction
 * over the devices and drivers in EAL.
 */

#ifdef __cplusplus
extern "C" {
#endif

#include <stdio.h>
#include <sys/queue.h>

#include <rte_log.h>
#include <rte_dev.h>

/** Double linked list of buses */
TAILQ_HEAD(rte_bus_list, rte_bus);

/**
 * Bus specific scan for devices attached on the bus.
 * For each bus object, the scan would be reponsible for finding devices and
 * adding them to its private device list.
 *
 * A bus should mandatorily implement this method.
 *
 * @return
 *	0 for successful scan
 *	<0 for unsuccessful scan with error value
 */
typedef int (*rte_bus_scan_t)(void);

/**
 * A structure describing a generic bus.
 */
struct rte_bus {
	TAILQ_ENTRY(rte_bus) next;   /**< Next bus object in linked list */
	const char *name;            /**< Name of the bus */
	rte_bus_scan_t scan;         /**< Scan for devices attached to bus */
};

/**
 * Register a Bus handler.
 *
 * @param bus
 *   A pointer to a rte_bus structure describing the bus
 *   to be registered.
 */
void rte_bus_register(struct rte_bus *bus);

/**
 * Unregister a Bus handler.
 *
 * @param bus
 *   A pointer to a rte_bus structure describing the bus
 *   to be unregistered.
 */
void rte_bus_unregister(struct rte_bus *bus);

/**
 * Scan all the buses.
 *
 * @return
 *   0 in case of success in scanning all buses
 *  !0 in case of failure to scan
 */
int rte_bus_scan(void);

/**
 * Dump information of all the buses registered with EAL.
 *
 * @param f
 *	 A valid and open output stream handle
 *
 * @return
 *	 0 in case of success
 *	!0 in case there is error in opening the output stream
 */
void rte_bus_dump(FILE *f);

/**
 * Helper for Bus registration.
 * The constructor has higher priority than PMD constructors.
 */
#define RTE_REGISTER_BUS(nm, bus) \
static void __attribute__((constructor(101), used)) businitfn_ ##nm(void) \
{\
	(bus).name = RTE_STR(nm);\
	rte_bus_register(&bus); \
}

#ifdef __cplusplus
}
#endif

#endif /* _RTE_BUS_H */