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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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