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/*
* drivers/net/ethernet/mellanox/mlxsw/item.h
* Copyright (c) 2015 Mellanox Technologies. All rights reserved.
* Copyright (c) 2015 Jiri Pirko <jiri@mellanox.com>
* Copyright (c) 2015 Ido Schimmel <idosch@mellanox.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the names of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _MLXSW_ITEM_H
#define _MLXSW_ITEM_H
#include <linux/types.h>
#include <linux/string.h>
#include <linux/bitops.h>
struct mlxsw_item {
unsigned short offset; /* bytes in container */
unsigned short step; /* step in bytes for indexed items */
unsigned short in_step_offset; /* offset within one step */
unsigned char shift; /* shift in bits */
unsigned char element_size; /* size of element in bit array */
bool no_real_shift;
union {
unsigned char bits;
unsigned short bytes;
} size;
const char *name;
};
static inline unsigned int
__mlxsw_item_offset(struct mlxsw_item *item, unsigned short index,
size_t typesize)
{
BUG_ON(index && !item->step);
if (item->offset % typesize != 0 ||
item->step % typesize != 0 ||
item->in_step_offset % typesize != 0) {
pr_err("mlxsw: item bug (name=%s,offset=%x,step=%x,in_step_offset=%x,typesize=%zx)\n",
item->name, item->offset, item->step,
item->in_step_offset, typesize);
BUG();
}
return ((item->offset + item->step * index + item->in_step_offset) /
typesize);
}
static inline u16 __mlxsw_item_get16(char *buf, struct mlxsw_item *item,
unsigned short index)
{
unsigned int offset = __mlxsw_item_offset(item, index, sizeof(u16));
__be16 *b = (__be16 *) buf;
u16 tmp;
tmp = be16_to_cpu(b[offset]);
tmp >>= item->shift;
tmp &= GENMASK(item->size.bits - 1, 0);
if (item->no_real_shift)
tmp <<= item->shift;
return tmp;
}
static inline void __mlxsw_item_set16(char *buf, struct mlxsw_item *item,
unsigned short index, u16 val)
{
unsigned int offset = __mlxsw_item_offset(item, index,
sizeof(u16));
__be16 *b = (__be16 *) buf;
u16 mask = GENMASK(item->size.bits - 1, 0) << item->shift;
u16 tmp;
if (!item->no_real_shift)
val <<= item->shift;
val &= mask;
tmp = be16_to_cpu(b[offset]);
tmp &= ~mask;
tmp |= val;
b[offset] = cpu_to_be16(tmp);
}
static inline u32 __mlxsw_item_get32(char *buf, struct mlxsw_item *item,
unsigned short index)
{
unsigned int offset = __mlxsw_item_offset(item, index, sizeof(u32));
__be32 *b = (__be32 *) buf;
u32 tmp;
tmp = be32_to_cpu(b[offset]);
tmp >>= item->shift;
tmp &= GENMASK(item->size.bits - 1, 0);
if (item->no_real_shift)
tmp <<= item->shift;
return tmp;
}
static inline void __mlxsw_item_set32(char *buf, struct mlxsw_item *item,
unsigned short index, u32 val)
{
unsigned int offset = __mlxsw_item_offset(item, index,
sizeof(u32));
__be32 *b = (__be32 *) buf;
u32 mask = GENMASK(item->size.bits - 1, 0) << item->shift;
u32 tmp;
if (!item->no_real_shift)
val <<= item->shift;
val &= mask;
tmp = be32_to_cpu(b[offset]);
tmp &= ~mask;
tmp |= val;
b[offset] = cpu_to_be32(tmp);
}
static inline u64 __mlxsw_item_get64(char *buf, struct mlxsw_item *item,
unsigned short index)
{
unsigned int offset = __mlxsw_item_offset(item, index, sizeof(u64));
__be64 *b = (__be64 *) buf;
u64 tmp;
tmp = be64_to_cpu(b[offset]);
tmp >>= item->shift;
tmp &= GENMASK_ULL(item->size.bits - 1, 0);
if (item->no_real_shift)
tmp <<= item->shift;
return tmp;
}
static inline void __mlxsw_item_set64(char *buf, struct mlxsw_item *item,
unsigned short index, u64 val)
{
unsigned int offset = __mlxsw_item_offset(item, index, sizeof(u64));
__be64 *b = (__be64 *) buf;
u64 mask = GENMASK_ULL(item->size.bits - 1, 0) << item->shift;
u64 tmp;
if (!item->no_real_shift)
val <<= item->shift;
val &= mask;
tmp = be64_to_cpu(b[offset]);
tmp &= ~mask;
tmp |= val;
b[offset] = cpu_to_be64(tmp);
}
static inline void __mlxsw_item_memcpy_from(char *buf, char *dst,
struct mlxsw_item *item)
{
memcpy(dst, &buf[item->offset], item->size.bytes);
}
static inline void __mlxsw_item_memcpy_to(char *buf, char *src,
struct mlxsw_item *item)
{
memcpy(&buf[item->offset], src, item->size.bytes);
}
static inline u16
__mlxsw_item_bit_array_offset(struct mlxsw_item *item, u16 index, u8 *shift)
{
u16 max_index, be_index;
u16 offset; /* byte offset inside the array */
BUG_ON(index && !item->element_size);
if (item->offset % sizeof(u32) != 0 ||
BITS_PER_BYTE % item->element_size != 0) {
pr_err("mlxsw: item bug (name=%s,offset=%x,element_size=%x)\n",
item->name, item->offset, item->element_size);
BUG();
}
max_index = (item->size.bytes << 3) / item->element_size - 1;
be_index = max_index - index;
offset = be_index * item->element_size >> 3;
*shift = index % (BITS_PER_BYTE / item->element_size) << 1;
return item->offset + offset;
}
static inline u8 __mlxsw_item_bit_array_get(char *buf, struct mlxsw_item *item,
u16 index)
{
u8 shift, tmp;
u16 offset = __mlxsw_item_bit_array_offset(item, index, &shift);
tmp = buf[offset];
tmp >>= shift;
tmp &= GENMASK(item->element_size - 1, 0);
return tmp;
}
static inline void __mlxsw_item_bit_array_set(char *buf, struct mlxsw_item *item,
u16 index, u8 val)
{
u8 shift, tmp;
u16 offset = __mlxsw_item_bit_array_offset(item, index, &shift);
u8 mask = GENMASK(item->element_size - 1, 0) << shift;
val <<= shift;
val &= mask;
tmp = buf[offset];
tmp &= ~mask;
tmp |= val;
buf[offset] = tmp;
}
#define __ITEM_NAME(_type, _cname, _iname) \
mlxsw_##_type##_##_cname##_##_iname##_item
/* _type: cmd_mbox, reg, etc.
* _cname: containter name (e.g. command name, register name)
* _iname: item name within the container
*/
#define MLXSW_ITEM16(_type, _cname, _iname, _offset, _shift, _sizebits) \
static struct mlxsw_item __ITEM_NAME(_type, _cname, _iname) = { \
.offset = _offset, \
.shift = _shift, \
.size = {.bits = _sizebits,}, \
.name = #_type "_" #_cname "_" #_iname, \
}; \
static inline u16 mlxsw_##_type##_##_cname##_##_iname##_get(char *buf) \
{ \
return __mlxsw_item_get16(buf, &__ITEM_NAME(_type, _cname, _iname), 0); \
} \
static inline void mlxsw_##_type##_##_cname##_##_iname##_set(char *buf, u16 val)\
{ \
__mlxsw_item_set16(buf, &__ITEM_NAME(_type, _cname, _iname), 0, val); \
}
#define MLXSW_ITEM16_INDEXED(_type, _cname, _iname, _offset, _shift, _sizebits, \
_step, _instepoffset, _norealshift) \
static struct mlxsw_item __ITEM_NAME(_type, _cname, _iname) = { \
.offset = _offset, \
.step = _step, \
.in_step_offset = _instepoffset, \
.shift = _shift, \
.no_real_shift = _norealshift, \
.size = {.bits = _sizebits,}, \
.name = #_type "_" #_cname "_" #_iname, \
}; \
static inline u16 \
mlxsw_##_type##_##_cname##_##_iname##_get(char *buf, unsigned short index) \
{ \
return __mlxsw_item_get16(buf, &__ITEM_NAME(_type, _cname, _iname), \
index); \
} \
static inline void \
mlxsw_##_type##_##_cname##_##_iname##_set(char *buf, unsigned short index, \
u16 val) \
{ \
__mlxsw_item_set16(buf, &__ITEM_NAME(_type, _cname, _iname), \
index, val); \
}
#define MLXSW_ITEM32(_type, _cname, _iname, _offset, _shift, _sizebits) \
static struct mlxsw_item __ITEM_NAME(_type, _cname, _iname) = { \
.offset = _offset, \
.shift = _shift, \
.size = {.bits = _sizebits,}, \
.name = #_type "_" #_cname "_" #_iname, \
}; \
static inline u32 mlxsw_##_type##_##_cname##_##_iname##_get(char *buf) \
{ \
return __mlxsw_item_get32(buf, &__ITEM_NAME(_type, _cname, _iname), 0); \
} \
static inline void mlxsw_##_type##_##_cname##_##_iname##_set(char *buf, u32 val)\
{ \
__mlxsw_item_set32(buf, &__ITEM_NAME(_type, _cname, _iname), 0, val); \
}
#define MLXSW_ITEM32_INDEXED(_type, _cname, _iname, _offset, _shift, _sizebits, \
_step, _instepoffset, _norealshift) \
static struct mlxsw_item __ITEM_NAME(_type, _cname, _iname) = { \
.offset = _offset, \
.step = _step, \
.in_step_offset = _instepoffset, \
.shift = _shift, \
.no_real_shift = _norealshift, \
.size = {.bits = _sizebits,}, \
.name = #_type "_" #_cname "_" #_iname, \
}; \
static inline u32 \
mlxsw_##_type##_##_cname##_##_iname##_get(char *buf, unsigned short index) \
{ \
return __mlxsw_item_get32(buf, &__ITEM_NAME(_type, _cname, _iname), \
index); \
} \
static inline void \
mlxsw_##_type##_##_cname##_##_iname##_set(char *buf, unsigned short index, \
u32 val) \
{ \
__mlxsw_item_set32(buf, &__ITEM_NAME(_type, _cname, _iname), \
index, val); \
}
#define MLXSW_ITEM64(_type, _cname, _iname, _offset, _shift, _sizebits) \
static struct mlxsw_item __ITEM_NAME(_type, _cname, _iname) = { \
.offset = _offset, \
.shift = _shift, \
.size = {.bits = _sizebits,}, \
.name = #_type "_" #_cname "_" #_iname, \
}; \
static inline u64 mlxsw_##_type##_##_cname##_##_iname##_get(char *buf) \
{ \
return __mlxsw_item_get64(buf, &__ITEM_NAME(_type, _cname, _iname), 0); \
} \
static inline void mlxsw_##_type##_##_cname##_##_iname##_set(char *buf, u64 val)\
{ \
__mlxsw_item_set64(buf, &__ITEM_NAME(_type, _cname, _iname), 0, val); \
}
#define MLXSW_ITEM64_INDEXED(_type, _cname, _iname, _offset, _shift, \
_sizebits, _step, _instepoffset, _norealshift) \
static struct mlxsw_item __ITEM_NAME(_type, _cname, _iname) = { \
.offset = _offset, \
.step = _step, \
.in_step_offset = _instepoffset, \
.shift = _shift, \
.no_real_shift = _norealshift, \
.size = {.bits = _sizebits,}, \
.name = #_type "_" #_cname "_" #_iname, \
}; \
static inline u64 \
mlxsw_##_type##_##_cname##_##_iname##_get(char *buf, unsigned short index) \
{ \
return __mlxsw_item_get64(buf, &__ITEM_NAME(_type, _cname, _iname), \
index); \
} \
static inline void \
mlxsw_##_type##_##_cname##_##_iname##_set(char *buf, unsigned short index, \
u64 val) \
{ \
__mlxsw_item_set64(buf, &__ITEM_NAME(_type, _cname, _iname), \
index, val); \
}
#define MLXSW_ITEM_BUF(_type, _cname, _iname, _offset, _sizebytes) \
static struct mlxsw_item __ITEM_NAME(_type, _cname, _iname) = { \
.offset = _offset, \
.size = {.bytes = _sizebytes,}, \
.name = #_type "_" #_cname "_" #_iname, \
}; \
static inline void \
mlxsw_##_type##_##_cname##_##_iname##_memcpy_from(char *buf, char *dst) \
{ \
__mlxsw_item_memcpy_from(buf, dst, &__ITEM_NAME(_type, _cname, _iname));\
} \
static inline void \
mlxsw_##_type##_##_cname##_##_iname##_memcpy_to(char *buf, char *src) \
{ \
__mlxsw_item_memcpy_to(buf, src, &__ITEM_NAME(_type, _cname, _iname)); \
}
#define MLXSW_ITEM_BIT_ARRAY(_type, _cname, _iname, _offset, _sizebytes, \
_element_size) \
static struct mlxsw_item __ITEM_NAME(_type, _cname, _iname) = { \
.offset = _offset, \
.element_size = _element_size, \
.size = {.bytes = _sizebytes,}, \
.name = #_type "_" #_cname "_" #_iname, \
}; \
static inline u8 \
mlxsw_##_type##_##_cname##_##_iname##_get(char *buf, u16 index) \
{ \
return __mlxsw_item_bit_array_get(buf, \
&__ITEM_NAME(_type, _cname, _iname), \
index); \
} \
static inline void \
mlxsw_##_type##_##_cname##_##_iname##_set(char *buf, u16 index, u8 val) \
{ \
return __mlxsw_item_bit_array_set(buf, \
&__ITEM_NAME(_type, _cname, _iname), \
index, val); \
} \
#endif
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