/* * Copyright (c) 2004 Topspin Corporation. All rights reserved. * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU * General Public License (GPL) Version 2, available from the file * COPYING in the main directory of this source tree, or the * OpenIB.org BSD license below: * * 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. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. * * $Id: packer.c 1349 2004-12-16 21:09:43Z roland $ */ #include <linux/string.h> #include <rdma/ib_pack.h> static u64 value_read(int offset, int size, void *structure) { switch (size) { case 1: return *(u8 *) (structure + offset); case 2: return be16_to_cpup((__be16 *) (structure + offset)); case 4: return be32_to_cpup((__be32 *) (structure + offset)); case 8: return be64_to_cpup((__be64 *) (structure + offset)); default: printk(KERN_WARNING "Field size %d bits not handled\n", size * 8); return 0; } } /** * ib_pack - Pack a structure into a buffer * @desc:Array of structure field descriptions * @desc_len:Number of entries in @desc * @structure:Structure to pack from * @buf:Buffer to pack into * * ib_pack() packs a list of structure fields into a buffer, * controlled by the array of fields in @desc. */ void ib_pack(const struct ib_field *desc, int desc_len, void *structure, void *buf) { int i; for (i = 0; i < desc_len; ++i) { if (desc[i].size_bits <= 32) { int shift; u32 val; __be32 mask; __be32 *addr; shift = 32 - desc[i].offset_bits - desc[i].size_bits; if (desc[i].struct_size_bytes) val = value_read(desc[i].struct_offset_bytes, desc[i].struct_size_bytes, structure) << shift; else val = 0; mask = cpu_to_be32(((1ull << desc[i].size_bits) - 1) << shift); addr = (__be32 *) buf + desc[i].offset_words; *addr = (*addr & ~mask) | (cpu_to_be32(val) & mask); } else if (desc[i].size_bits <= 64) { int shift; u64 val; __be64 mask; __be64 *addr; shift = 64 - desc[i].offset_bits - desc[i].size_bits; if (desc[i].struct_size_bytes) val = value_read(desc[i].struct_offset_bytes, desc[i].struct_size_bytes, structure) << shift; else val = 0; mask = cpu_to_be64((~0ull >> (64 - desc[i].size_bits)) << shift); addr = (__be64 *) ((__be32 *) buf + desc[i].offset_words); *addr = (*addr & ~mask) | (cpu_to_be64(val) & mask); } else { if (desc[i].offset_bits % 8 || desc[i].size_bits % 8) { printk(KERN_WARNING "Structure field %s of size %d " "bits is not byte-aligned\n", desc[i].field_name, desc[i].size_bits); } if (desc[i].struct_size_bytes) memcpy(buf + desc[i].offset_words * 4 + desc[i].offset_bits / 8, structure + desc[i].struct_offset_bytes, desc[i].size_bits / 8); else memset(buf + desc[i].offset_words * 4 + desc[i].offset_bits / 8, 0, desc[i].size_bits / 8); } } } EXPORT_SYMBOL(ib_pack); static void value_write(int offset, int size, u64 val, void *structure) { switch (size * 8) { case 8: *( u8 *) (structure + offset) = val; break; case 16: *(__be16 *) (structure + offset) = cpu_to_be16(val); break; case 32: *(__be32 *) (structure + offset) = cpu_to_be32(val); break; case 64: *(__be64 *) (structure + offset) = cpu_to_be64(val); break; default: printk(KERN_WARNING "Field size %d bits not handled\n", size * 8); } } /** * ib_unpack - Unpack a buffer into a structure * @desc:Array of structure field descriptions * @desc_len:Number of entries in @desc * @buf:Buffer to unpack from * @structure:Structure to unpack into * * ib_pack() unpacks a list of structure fields from a buffer, * controlled by the array of fields in @desc. */ void ib_unpack(const struct ib_field *desc, int desc_len, void *buf, void *structure) { int i; for (i = 0; i < desc_len; ++i) { if (!desc[i].struct_size_bytes) continue; if (desc[i].size_bits <= 32) { int shift; u32 val; u32 mask; __be32 *addr; shift = 32 - desc[i].offset_bits - desc[i].size_bits; mask = ((1ull << desc[i].size_bits) - 1) << shift; addr = (__be32 *) buf + desc[i].offset_words; val = (be32_to_cpup(addr) & mask) >> shift; value_write(desc[i].struct_offset_bytes, desc[i].struct_size_bytes, val, structure); } else if (desc[i].size_bits <= 64) { int shift; u64 val; u64 mask; __be64 *addr; shift = 64 - desc[i].offset_bits - desc[i].size_bits; mask = (~0ull >> (64 - desc[i].size_bits)) << shift; addr = (__be64 *) buf + desc[i].offset_words; val = (be64_to_cpup(addr) & mask) >> shift; value_write(desc[i].struct_offset_bytes, desc[i].struct_size_bytes, val, structure); } else { if (desc[i].offset_bits % 8 || desc[i].size_bits % 8) { printk(KERN_WARNING "Structure field %s of size %d " "bits is not byte-aligned\n", desc[i].field_name, desc[i].size_bits); } memcpy(structure + desc[i].struct_offset_bytes, buf + desc[i].offset_words * 4 + desc[i].offset_bits / 8, desc[i].size_bits / 8); } } } EXPORT_SYMBOL(ib_unpack);