mirror of
https://github.com/openvswitch/ovs
synced 2025-08-28 21:07:47 +00:00
f25d0cf3c3
OpenFlow actions have always been somewhat awkward to handle. Moreover, over time we've started creating actions that require more complicated parsing. When we maintain those actions internally in their wire format, we end up parsing them multiple times, whenever we have to look at the set of actions. When we add support for OpenFlow 1.1 or later protocols, the situation will get worse, because these newer protocols support many of the same actions but with different representations. It becomes unrealistic to handle each protocol in its wire format. This commit adopts a new strategy, by converting OpenFlow actions into an internal form from the wire format when they are read, and converting them back to the wire format when flows are dumped. I believe that this will be more maintainable over time. Thanks to Simon Horman and Pravin Shelar for reviews. Signed-off-by: Ben Pfaff <blp@nicira.com>
59 lines
2.1 KiB
C
59 lines
2.1 KiB
C
/*
|
|
* Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at:
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#ifndef COMPILER_H
|
|
#define COMPILER_H 1
|
|
|
|
#if __GNUC__ && !__CHECKER__
|
|
#define NO_RETURN __attribute__((__noreturn__))
|
|
#define OVS_UNUSED __attribute__((__unused__))
|
|
#define PRINTF_FORMAT(FMT, ARG1) __attribute__((__format__(printf, FMT, ARG1)))
|
|
#define STRFTIME_FORMAT(FMT) __attribute__((__format__(__strftime__, FMT, 0)))
|
|
#define MALLOC_LIKE __attribute__((__malloc__))
|
|
#define ALWAYS_INLINE __attribute__((always_inline))
|
|
#define WARN_UNUSED_RESULT __attribute__((__warn_unused_result__))
|
|
#define SENTINEL(N) __attribute__((sentinel(N)))
|
|
#else
|
|
#define NO_RETURN
|
|
#define OVS_UNUSED
|
|
#define PRINTF_FORMAT(FMT, ARG1)
|
|
#define STRFTIME_FORMAT(FMT)
|
|
#define MALLOC_LIKE
|
|
#define ALWAYS_INLINE
|
|
#define WARN_UNUSED_RESULT
|
|
#define SENTINEL(N)
|
|
#endif
|
|
|
|
/* ISO C says that a C implementation may choose any integer type for an enum
|
|
* that is sufficient to hold all of its values. Common ABIs (such as the
|
|
* System V ABI used on i386 GNU/Linux) always use a full-sized "int", even
|
|
* when a smaller type would suffice.
|
|
*
|
|
* In GNU C, "enum __attribute__((packed)) name { ... }" defines 'name' as an
|
|
* enum compatible with a type that is no bigger than necessary. This is the
|
|
* intended use of OVS_PACKED_ENUM.
|
|
*
|
|
* OVS_PACKED_ENUM is intended for use only as a space optimization, since it
|
|
* only works with GCC. That means that it must not be used in wire protocols
|
|
* or otherwise exposed outside of a single process. */
|
|
#if __GNUC__ && !__CHECKER__
|
|
#define OVS_PACKED_ENUM __attribute__((__packed__))
|
|
#else
|
|
#define OVS_PACKED_ENUM
|
|
#endif
|
|
|
|
#endif /* compiler.h */
|