1/* 2 * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved. 3 * Copyright (c) 2002-2005 Mellanox Technologies LTD. All rights reserved. 4 * Copyright (c) 1996-2003 Intel Corporation. All rights reserved. 5 * 6 * This software is available to you under a choice of one of two 7 * licenses. You may choose to be licensed under the terms of the GNU 8 * General Public License (GPL) Version 2, available from the file 9 * COPYING in the main directory of this source tree, or the 10 * OpenIB.org BSD license below: 11 * 12 * Redistribution and use in source and binary forms, with or 13 * without modification, are permitted provided that the following 14 * conditions are met: 15 * 16 * - Redistributions of source code must retain the above 17 * copyright notice, this list of conditions and the following 18 * disclaimer. 19 * 20 * - Redistributions in binary form must reproduce the above 21 * copyright notice, this list of conditions and the following 22 * disclaimer in the documentation and/or other materials 23 * provided with the distribution. 24 * 25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 32 * SOFTWARE. 33 * 34 */ 35 36/* 37 * Abstract: 38 * Turns on byte packing, which is necessary for passing information from 39 * system to system over a network to ensure no padding by the compiler has 40 * taken place. 41 */ 42 43/****h* Component Library/Structure Packing 44* NAME 45* Structure Packing 46* 47* DESCRIPTION 48* The structure packing header files allow packing structures on byte 49* boundaries. 50* 51* Structure packing should be used whenever a structure is transmitted 52* between systems, as different platforms pad structures differently if 53* they are not packed. Packing a structure that is not transmitted between 54* systems can be detrimental to performance, as fields in the structure may 55* not align properly for some platforms. Care must be taken when creating 56* packed structures that the alignment rules for all platforms are followed. 57* 58* To pack a structure, include cl_packon.h before defining the structure, and 59* include cl_packoff.h after the structure definition. Multiple structures 60* can be packed between the two include statements if desired. 61* 62* The structure definition itself must use the PACK_SUFFIX keyword. 63* 64* EXAMPLE 65* #include <complib/cl_packon.h> 66* 67* typedef _my_struct_t 68* { 69* uint64 large; 70* uint32 medium; 71* uint16 small; 72* 73* } PACK_SUFFIX my_struct_t; 74* #include <complib/cl_packoff.h> 75*********/ 76 77#ifndef PACK_SUFFIX 78#define PACK_SUFFIX __attribute__((packed)) 79#endif 80 81#ifdef _MSC_VER 82#pragma pack (push, 1) 83#endif 84