1219820Sjeff/*
2219820Sjeff * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
3219820Sjeff * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
4219820Sjeff *
5219820Sjeff * This software is available to you under a choice of one of two
6219820Sjeff * licenses.  You may choose to be licensed under the terms of the GNU
7219820Sjeff * General Public License (GPL) Version 2, available from the file
8219820Sjeff * COPYING in the main directory of this source tree, or the
9219820Sjeff * OpenIB.org BSD license below:
10219820Sjeff *
11219820Sjeff *     Redistribution and use in source and binary forms, with or
12219820Sjeff *     without modification, are permitted provided that the following
13219820Sjeff *     conditions are met:
14219820Sjeff *
15219820Sjeff *      - Redistributions of source code must retain the above
16219820Sjeff *        copyright notice, this list of conditions and the following
17219820Sjeff *        disclaimer.
18219820Sjeff *
19219820Sjeff *      - Redistributions in binary form must reproduce the above
20219820Sjeff *        copyright notice, this list of conditions and the following
21219820Sjeff *        disclaimer in the documentation and/or other materials
22219820Sjeff *        provided with the distribution.
23219820Sjeff *
24219820Sjeff * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25219820Sjeff * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26219820Sjeff * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27219820Sjeff * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28219820Sjeff * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29219820Sjeff * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30219820Sjeff * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31219820Sjeff * SOFTWARE.
32219820Sjeff */
33219820Sjeff
34219820Sjeff#include <linux/string.h>
35219820Sjeff
36219820Sjeff#include <rdma/ib_pack.h>
37219820Sjeff
38219820Sjeffstatic u64 value_read(int offset, int size, void *structure)
39219820Sjeff{
40219820Sjeff	switch (size) {
41219820Sjeff	case 1: return                *(u8  *) (structure + offset);
42219820Sjeff	case 2: return be16_to_cpup((__be16 *) (structure + offset));
43219820Sjeff	case 4: return be32_to_cpup((__be32 *) (structure + offset));
44219820Sjeff	case 8: return be64_to_cpup((__be64 *) (structure + offset));
45219820Sjeff	default:
46219820Sjeff		printk(KERN_WARNING "Field size %d bits not handled\n", size * 8);
47219820Sjeff		return 0;
48219820Sjeff	}
49219820Sjeff}
50219820Sjeff
51219820Sjeff/**
52219820Sjeff * ib_pack - Pack a structure into a buffer
53219820Sjeff * @desc:Array of structure field descriptions
54219820Sjeff * @desc_len:Number of entries in @desc
55219820Sjeff * @structure:Structure to pack from
56219820Sjeff * @buf:Buffer to pack into
57219820Sjeff *
58219820Sjeff * ib_pack() packs a list of structure fields into a buffer,
59219820Sjeff * controlled by the array of fields in @desc.
60219820Sjeff */
61219820Sjeffvoid ib_pack(const struct ib_field        *desc,
62219820Sjeff	     int                           desc_len,
63219820Sjeff	     void                         *structure,
64219820Sjeff	     void                         *buf)
65219820Sjeff{
66219820Sjeff	int i;
67219820Sjeff
68219820Sjeff	for (i = 0; i < desc_len; ++i) {
69219820Sjeff		if (desc[i].size_bits <= 32) {
70219820Sjeff			int shift;
71219820Sjeff			u32 val;
72219820Sjeff			__be32 mask;
73219820Sjeff			__be32 *addr;
74219820Sjeff
75219820Sjeff			shift = 32 - desc[i].offset_bits - desc[i].size_bits;
76219820Sjeff			if (desc[i].struct_size_bytes)
77219820Sjeff				val = value_read(desc[i].struct_offset_bytes,
78219820Sjeff						 desc[i].struct_size_bytes,
79219820Sjeff						 structure) << shift;
80219820Sjeff			else
81219820Sjeff				val = 0;
82219820Sjeff
83219820Sjeff			mask = cpu_to_be32(((1ull << desc[i].size_bits) - 1) << shift);
84219820Sjeff			addr = (__be32 *) buf + desc[i].offset_words;
85219820Sjeff			*addr = (*addr & ~mask) | (cpu_to_be32(val) & mask);
86219820Sjeff		} else if (desc[i].size_bits <= 64) {
87219820Sjeff			int shift;
88219820Sjeff			u64 val;
89219820Sjeff			__be64 mask;
90219820Sjeff			__be64 *addr;
91219820Sjeff
92219820Sjeff			shift = 64 - desc[i].offset_bits - desc[i].size_bits;
93219820Sjeff			if (desc[i].struct_size_bytes)
94219820Sjeff				val = value_read(desc[i].struct_offset_bytes,
95219820Sjeff						 desc[i].struct_size_bytes,
96219820Sjeff						 structure) << shift;
97219820Sjeff			else
98219820Sjeff				val = 0;
99219820Sjeff
100219820Sjeff			mask = cpu_to_be64((~0ull >> (64 - desc[i].size_bits)) << shift);
101219820Sjeff			addr = (__be64 *) ((__be32 *) buf + desc[i].offset_words);
102219820Sjeff			*addr = (*addr & ~mask) | (cpu_to_be64(val) & mask);
103219820Sjeff		} else {
104219820Sjeff			if (desc[i].offset_bits % 8 ||
105219820Sjeff			    desc[i].size_bits   % 8) {
106219820Sjeff				printk(KERN_WARNING "Structure field %s of size %d "
107219820Sjeff				       "bits is not byte-aligned\n",
108219820Sjeff				       desc[i].field_name, desc[i].size_bits);
109219820Sjeff			}
110219820Sjeff
111219820Sjeff			if (desc[i].struct_size_bytes)
112219820Sjeff				memcpy(buf + desc[i].offset_words * 4 +
113219820Sjeff				       desc[i].offset_bits / 8,
114219820Sjeff				       structure + desc[i].struct_offset_bytes,
115219820Sjeff				       desc[i].size_bits / 8);
116219820Sjeff			else
117219820Sjeff				memset(buf + desc[i].offset_words * 4 +
118219820Sjeff				       desc[i].offset_bits / 8,
119219820Sjeff				       0,
120219820Sjeff				       desc[i].size_bits / 8);
121219820Sjeff		}
122219820Sjeff	}
123219820Sjeff}
124219820SjeffEXPORT_SYMBOL(ib_pack);
125219820Sjeff
126219820Sjeffstatic void value_write(int offset, int size, u64 val, void *structure)
127219820Sjeff{
128219820Sjeff	switch (size * 8) {
129219820Sjeff	case 8:  *(    u8 *) (structure + offset) = val; break;
130219820Sjeff	case 16: *(__be16 *) (structure + offset) = cpu_to_be16(val); break;
131219820Sjeff	case 32: *(__be32 *) (structure + offset) = cpu_to_be32(val); break;
132219820Sjeff	case 64: *(__be64 *) (structure + offset) = cpu_to_be64(val); break;
133219820Sjeff	default:
134219820Sjeff		printk(KERN_WARNING "Field size %d bits not handled\n", size * 8);
135219820Sjeff	}
136219820Sjeff}
137219820Sjeff
138219820Sjeff/**
139219820Sjeff * ib_unpack - Unpack a buffer into a structure
140219820Sjeff * @desc:Array of structure field descriptions
141219820Sjeff * @desc_len:Number of entries in @desc
142219820Sjeff * @buf:Buffer to unpack from
143219820Sjeff * @structure:Structure to unpack into
144219820Sjeff *
145219820Sjeff * ib_pack() unpacks a list of structure fields from a buffer,
146219820Sjeff * controlled by the array of fields in @desc.
147219820Sjeff */
148219820Sjeffvoid ib_unpack(const struct ib_field        *desc,
149219820Sjeff	       int                           desc_len,
150219820Sjeff	       void                         *buf,
151219820Sjeff	       void                         *structure)
152219820Sjeff{
153219820Sjeff	int i;
154219820Sjeff
155219820Sjeff	for (i = 0; i < desc_len; ++i) {
156219820Sjeff		if (!desc[i].struct_size_bytes)
157219820Sjeff			continue;
158219820Sjeff
159219820Sjeff		if (desc[i].size_bits <= 32) {
160219820Sjeff			int shift;
161219820Sjeff			u32  val;
162219820Sjeff			u32  mask;
163219820Sjeff			__be32 *addr;
164219820Sjeff
165219820Sjeff			shift = 32 - desc[i].offset_bits - desc[i].size_bits;
166219820Sjeff			mask = ((1ull << desc[i].size_bits) - 1) << shift;
167219820Sjeff			addr = (__be32 *) buf + desc[i].offset_words;
168219820Sjeff			val = (be32_to_cpup(addr) & mask) >> shift;
169219820Sjeff			value_write(desc[i].struct_offset_bytes,
170219820Sjeff				    desc[i].struct_size_bytes,
171219820Sjeff				    val,
172219820Sjeff				    structure);
173219820Sjeff		} else if (desc[i].size_bits <= 64) {
174219820Sjeff			int shift;
175219820Sjeff			u64  val;
176219820Sjeff			u64  mask;
177219820Sjeff			__be64 *addr;
178219820Sjeff
179219820Sjeff			shift = 64 - desc[i].offset_bits - desc[i].size_bits;
180219820Sjeff			mask = (~0ull >> (64 - desc[i].size_bits)) << shift;
181219820Sjeff			addr = (__be64 *) buf + desc[i].offset_words;
182219820Sjeff			val = (be64_to_cpup(addr) & mask) >> shift;
183219820Sjeff			value_write(desc[i].struct_offset_bytes,
184219820Sjeff				    desc[i].struct_size_bytes,
185219820Sjeff				    val,
186219820Sjeff				    structure);
187219820Sjeff		} else {
188219820Sjeff			if (desc[i].offset_bits % 8 ||
189219820Sjeff			    desc[i].size_bits   % 8) {
190219820Sjeff				printk(KERN_WARNING "Structure field %s of size %d "
191219820Sjeff				       "bits is not byte-aligned\n",
192219820Sjeff				       desc[i].field_name, desc[i].size_bits);
193219820Sjeff			}
194219820Sjeff
195219820Sjeff			memcpy(structure + desc[i].struct_offset_bytes,
196219820Sjeff			       buf + desc[i].offset_words * 4 +
197219820Sjeff			       desc[i].offset_bits / 8,
198219820Sjeff			       desc[i].size_bits / 8);
199219820Sjeff		}
200219820Sjeff	}
201219820Sjeff}
202219820SjeffEXPORT_SYMBOL(ib_unpack);
203