DPDK
/usr/bin/make-f/build/dpdk-zboOyB/dpdk-16.07/mk/rte.sdkconfig.mkshowversion
Main Page
Related Pages
Data Structures
Files
Examples
File List
Globals
lib
librte_compat
rte_compat.h
1
/*-
2
* BSD LICENSE
3
*
4
* Copyright(c) 2015 Neil Horman <nhorman@tuxdriver.com>.
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
*
18
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29
*/
30
31
#ifndef _RTE_COMPAT_H_
32
#define _RTE_COMPAT_H_
33
#include <
rte_common.h
>
34
35
#ifdef RTE_BUILD_SHARED_LIB
36
37
/*
38
* Provides backwards compatibility when updating exported functions.
39
* When a symol is exported from a library to provide an API, it also provides a
40
* calling convention (ABI) that is embodied in its name, return type,
41
* arguments, etc. On occasion that function may need to change to accommodate
42
* new functionality, behavior, etc. When that occurs, it is desireable to
43
* allow for backwards compatibility for a time with older binaries that are
44
* dynamically linked to the dpdk. To support that, the __vsym and
45
* VERSION_SYMBOL macros are created. They, in conjunction with the
46
* <library>_version.map file for a given library allow for multiple versions of
47
* a symbol to exist in a shared library so that older binaries need not be
48
* immediately recompiled.
49
*
50
* Refer to the guidelines document in the docs subdirectory for details on the
51
* use of these macros
52
*/
53
54
/*
55
* Macro Parameters:
56
* b - function base name
57
* e - function version extension, to be concatenated with base name
58
* n - function symbol version string to be applied
59
* f - function prototype
60
* p - full function symbol name
61
*/
62
63
/*
64
* VERSION_SYMBOL
65
* Creates a symbol version table entry binding symbol <b>@DPDK_<n> to the internal
66
* function name <b>_<e>
67
*/
68
#define VERSION_SYMBOL(b, e, n) __asm__(".symver " RTE_STR(b) RTE_STR(e) ", " RTE_STR(b) "@DPDK_" RTE_STR(n))
69
70
/*
71
* BIND_DEFAULT_SYMBOL
72
* Creates a symbol version entry instructing the linker to bind references to
73
* symbol <b> to the internal symbol <b>_<e>
74
*/
75
#define BIND_DEFAULT_SYMBOL(b, e, n) __asm__(".symver " RTE_STR(b) RTE_STR(e) ", " RTE_STR(b) "@@DPDK_" RTE_STR(n))
76
#define __vsym __attribute__((used))
77
78
/*
79
* MAP_STATIC_SYMBOL
80
* If a function has been bifurcated into multiple versions, none of which
81
* are defined as the exported symbol name in the map file, this macro can be
82
* used to alias a specific version of the symbol to its exported name. For
83
* example, if you have 2 versions of a function foo_v1 and foo_v2, where the
84
* former is mapped to foo@DPDK_1 and the latter is mapped to foo@DPDK_2 when
85
* building a shared library, this macro can be used to map either foo_v1 or
86
* foo_v2 to the symbol foo when building a static library, e.g.:
87
* MAP_STATIC_SYMBOL(void foo(), foo_v2);
88
*/
89
#define MAP_STATIC_SYMBOL(f, p)
90
91
#else
92
/*
93
* No symbol versioning in use
94
*/
95
#define VERSION_SYMBOL(b, e, n)
96
#define __vsym
97
#define BIND_DEFAULT_SYMBOL(b, e, n)
98
#define MAP_STATIC_SYMBOL(f, p) f __attribute__((alias(RTE_STR(p))))
99
/*
100
* RTE_BUILD_SHARED_LIB=n
101
*/
102
#endif
103
104
105
#endif
/* _RTE_COMPAT_H_ */
rte_common.h
Generated by
1.8.11