2 * Copyright (c) 2010, 2011, 2013, 2014 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #ifndef OPENVSWITCH_TYPES_H
18 #define OPENVSWITCH_TYPES_H 1
20 #include <sys/types.h>
22 #include "openvswitch/compiler.h"
25 #define OVS_BITWISE __attribute__((bitwise))
26 #define OVS_FORCE __attribute__((force))
32 /* The ovs_be<N> types indicate that an object is in big-endian, not
33 * native-endian, byte order. They are otherwise equivalent to uint<N>_t. */
34 typedef uint16_t OVS_BITWISE ovs_be16;
35 typedef uint32_t OVS_BITWISE ovs_be32;
36 typedef uint64_t OVS_BITWISE ovs_be64;
38 #define OVS_BE16_MAX ((OVS_FORCE ovs_be16) 0xffff)
39 #define OVS_BE32_MAX ((OVS_FORCE ovs_be32) 0xffffffff)
40 #define OVS_BE64_MAX ((OVS_FORCE ovs_be64) 0xffffffffffffffffULL)
42 /* These types help with a few funny situations:
44 * - The Ethernet header is 14 bytes long, which misaligns everything after
45 * that. One can put 2 "shim" bytes before the Ethernet header, but this
46 * helps only if there is exactly one Ethernet header. If there are two,
47 * as with GRE and VXLAN (and if the inner header doesn't use this
48 * trick--GRE and VXLAN don't) then you have the choice of aligning the
49 * inner data or the outer data. So it seems better to treat 32-bit fields
50 * in protocol headers as aligned only on 16-bit boundaries.
52 * - ARP headers contain misaligned 32-bit fields.
54 * - Netlink and OpenFlow contain 64-bit values that are only guaranteed to
55 * be aligned on 32-bit boundaries.
57 * lib/unaligned.h has helper functions for accessing these. */
59 /* A 32-bit value, in host byte order, that is only aligned on a 16-bit
62 #ifdef WORDS_BIGENDIAN
69 /* A 32-bit value, in network byte order, that is only aligned on a 16-bit
75 /* A 64-bit value, in host byte order, that is only aligned on a 32-bit
78 #ifdef WORDS_BIGENDIAN
88 #ifdef WORDS_BIGENDIAN
103 /* MSVC2015 doesn't support designated initializers when compiling C++,
104 * and doesn't support ternary operators with non-designated initializers.
105 * So we use these static definitions rather than using initializer macros. */
106 static const ovs_u128 OVS_U128_MAX = { { UINT32_MAX, UINT32_MAX,
107 UINT32_MAX, UINT32_MAX } };
108 static const ovs_be128 OVS_BE128_MAX OVS_UNUSED = { { OVS_BE32_MAX, OVS_BE32_MAX,
109 OVS_BE32_MAX, OVS_BE32_MAX } };
111 /* A 64-bit value, in network byte order, that is only aligned on a 32-bit
115 } ovs_32aligned_be64;
117 /* ofp_port_t represents the port number of a OpenFlow switch.
118 * odp_port_t represents the port number on the datapath.
119 * ofp11_port_t represents the OpenFlow-1.1 port number. */
120 typedef uint16_t OVS_BITWISE ofp_port_t;
121 typedef uint32_t OVS_BITWISE odp_port_t;
122 typedef uint32_t OVS_BITWISE ofp11_port_t;
124 /* Macro functions that cast int types to ofp/odp/ofp11 types. */
125 #define OFP_PORT_C(X) ((OVS_FORCE ofp_port_t) (X))
126 #define ODP_PORT_C(X) ((OVS_FORCE odp_port_t) (X))
127 #define OFP11_PORT_C(X) ((OVS_FORCE ofp11_port_t) (X))
129 /* Using this struct instead of a bare array makes an ethernet address field
130 * assignable. The size of the array is also part of the type, so it is easier
139 #endif /* openvswitch/types.h */