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