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