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/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
/*
* Copyright (c) 2020, Mellanox Technologies inc. All rights reserved.
*/
#ifndef _IBA_DEFS_H_
#define _IBA_DEFS_H_
#include <linux/kernel.h>
#include <linux/bitfield.h>
#include <asm/unaligned.h>
static inline u32 _iba_get8(const u8 *ptr)
{
return *ptr;
}
static inline void _iba_set8(u8 *ptr, u32 mask, u32 prep_value)
{
*ptr = (*ptr & ~mask) | prep_value;
}
static inline u16 _iba_get16(const __be16 *ptr)
{
return be16_to_cpu(*ptr);
}
static inline void _iba_set16(__be16 *ptr, u16 mask, u16 prep_value)
{
*ptr = cpu_to_be16((be16_to_cpu(*ptr) & ~mask) | prep_value);
}
static inline u32 _iba_get32(const __be32 *ptr)
{
return be32_to_cpu(*ptr);
}
static inline void _iba_set32(__be32 *ptr, u32 mask, u32 prep_value)
{
*ptr = cpu_to_be32((be32_to_cpu(*ptr) & ~mask) | prep_value);
}
static inline u64 _iba_get64(const __be64 *ptr)
{
/*
* The mads are constructed so that 32 bit and smaller are naturally
* aligned, everything larger has a max alignment of 4 bytes.
*/
return be64_to_cpu(get_unaligned(ptr));
}
static inline void _iba_set64(__be64 *ptr, u64 mask, u64 prep_value)
{
put_unaligned(cpu_to_be64((_iba_get64(ptr) & ~mask) | prep_value), ptr);
}
#define _IBA_SET(field_struct, field_offset, field_mask, num_bits, ptr, value) \
({ \
field_struct *_ptr = ptr; \
_iba_set##num_bits((void *)_ptr + (field_offset), field_mask, \
FIELD_PREP(field_mask, value)); \
})
#define IBA_SET(field, ptr, value) _IBA_SET(field, ptr, value)
#define _IBA_GET_MEM_PTR(field_struct, field_offset, type, num_bits, ptr) \
({ \
field_struct *_ptr = ptr; \
(type *)((void *)_ptr + (field_offset)); \
})
#define IBA_GET_MEM_PTR(field, ptr) _IBA_GET_MEM_PTR(field, ptr)
/* FIXME: A set should always set the entire field, meaning we should zero the trailing bytes */
#define _IBA_SET_MEM(field_struct, field_offset, type, num_bits, ptr, in, \
bytes) \
({ \
const type *_in_ptr = in; \
WARN_ON(bytes * 8 > num_bits); \
if (in && bytes) \
memcpy(_IBA_GET_MEM_PTR(field_struct, field_offset, \
type, num_bits, ptr), \
_in_ptr, bytes); \
})
#define IBA_SET_MEM(field, ptr, in, bytes) _IBA_SET_MEM(field, ptr, in, bytes)
#define _IBA_GET(field_struct, field_offset, field_mask, num_bits, ptr) \
({ \
const field_struct *_ptr = ptr; \
(u##num_bits) FIELD_GET( \
field_mask, _iba_get##num_bits((const void *)_ptr + \
(field_offset))); \
})
#define IBA_GET(field, ptr) _IBA_GET(field, ptr)
#define _IBA_GET_MEM(field_struct, field_offset, type, num_bits, ptr, out, \
bytes) \
({ \
type *_out_ptr = out; \
WARN_ON(bytes * 8 > num_bits); \
if (out && bytes) \
memcpy(_out_ptr, \
_IBA_GET_MEM_PTR(field_struct, field_offset, \
type, num_bits, ptr), \
bytes); \
})
#define IBA_GET_MEM(field, ptr, out, bytes) _IBA_GET_MEM(field, ptr, out, bytes)
/*
* The generated list becomes the parameters to the macros, the order is:
* - struct this applies to
* - starting offset of the max
* - GENMASK or GENMASK_ULL in CPU order
* - The width of data the mask operations should work on, in bits
*/
/*
* Extraction using a tabular description like table 106. bit_offset is from
* the Byte[Bit] notation.
*/
#define IBA_FIELD_BLOC(field_struct, byte_offset, bit_offset, num_bits) \
field_struct, byte_offset, \
GENMASK(7 - (bit_offset), 7 - (bit_offset) - (num_bits - 1)), \
8
#define IBA_FIELD8_LOC(field_struct, byte_offset, num_bits) \
IBA_FIELD_BLOC(field_struct, byte_offset, 0, num_bits)
#define IBA_FIELD16_LOC(field_struct, byte_offset, num_bits) \
field_struct, (byte_offset)&0xFFFE, \
GENMASK(15 - (((byte_offset) % 2) * 8), \
15 - (((byte_offset) % 2) * 8) - (num_bits - 1)), \
16
#define IBA_FIELD32_LOC(field_struct, byte_offset, num_bits) \
field_struct, (byte_offset)&0xFFFC, \
GENMASK(31 - (((byte_offset) % 4) * 8), \
31 - (((byte_offset) % 4) * 8) - (num_bits - 1)), \
32
#define IBA_FIELD64_LOC(field_struct, byte_offset) \
field_struct, byte_offset, GENMASK_ULL(63, 0), 64
/*
* In IBTA spec, everything that is more than 64bits is multiple
* of bytes without leftover bits.
*/
#define IBA_FIELD_MLOC(field_struct, byte_offset, num_bits, type) \
field_struct, byte_offset, type, num_bits
#endif /* _IBA_DEFS_H_ */
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