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| 2 | |
| 3 | * Copyright (c) 2020, Mellanox Technologies inc. All rights reserved.
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| 4 |
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| 5 | #ifndef _IBA_DEFS_H_
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| 6 | #define _IBA_DEFS_H_
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| 7 |
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| 8 | #include <linux/kernel.h>
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| 9 | #include <linux/bitfield.h>
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| 10 | #include <linux/unaligned.h>
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| 11 |
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| 12 | static inline u32 _iba_get8(const u8 *ptr)
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| 13 | {
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| 14 | return *ptr;
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| 15 | }
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| 16 |
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| 17 | static inline void _iba_set8(u8 *ptr, u32 mask, u32 prep_value)
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| 18 | {
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| 19 | *ptr = (*ptr & ~mask) | prep_value;
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| 20 | }
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| 21 |
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| 22 | static inline u16 _iba_get16(const __be16 *ptr)
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| 23 | {
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| 24 | return be16_to_cpu(*ptr);
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| 25 | }
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| 26 |
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| 27 | static inline void _iba_set16(__be16 *ptr, u16 mask, u16 prep_value)
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| 28 | {
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| 29 | *ptr = cpu_to_be16((be16_to_cpu(*ptr) & ~mask) | prep_value);
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| 30 | }
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| 31 |
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| 32 | static inline u32 _iba_get32(const __be32 *ptr)
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| 33 | {
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| 34 | return be32_to_cpu(*ptr);
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| 35 | }
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| 36 |
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| 37 | static inline void _iba_set32(__be32 *ptr, u32 mask, u32 prep_value)
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| 38 | {
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| 39 | *ptr = cpu_to_be32((be32_to_cpu(*ptr) & ~mask) | prep_value);
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| 40 | }
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| 41 |
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| 42 | static inline u64 _iba_get64(const __be64 *ptr)
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| 43 | {
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| 44 | |
| 45 | * The mads are constructed so that 32 bit and smaller are naturally
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| 46 | * aligned, everything larger has a max alignment of 4 bytes.
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| 47 |
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| 48 | return be64_to_cpu(get_unaligned(ptr));
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| 49 | }
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| 50 |
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| 51 | static inline void _iba_set64(__be64 *ptr, u64 mask, u64 prep_value)
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| 52 | {
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| 53 | put_unaligned(cpu_to_be64((_iba_get64(ptr) & ~mask) | prep_value), ptr);
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| 54 | }
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| 55 |
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| 56 | #define _IBA_SET(field_struct, field_offset, field_mask, num_bits, ptr, value) \
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| 57 | ({ \
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| 58 | field_struct *_ptr = ptr; \
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| 59 | _iba_set##num_bits((void *)_ptr + (field_offset), field_mask, \
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| 60 | FIELD_PREP(field_mask, value)); \
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| 61 | })
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| 62 | #define IBA_SET(field, ptr, value) _IBA_SET(field, ptr, value)
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| 63 |
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| 64 | #define _IBA_GET_MEM_PTR(field_struct, field_offset, type, num_bits, ptr) \
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| 65 | ({ \
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| 66 | field_struct *_ptr = ptr; \
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| 67 | (type *)((void *)_ptr + (field_offset)); \
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| 68 | })
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| 69 | #define IBA_GET_MEM_PTR(field, ptr) _IBA_GET_MEM_PTR(field, ptr)
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| 70 |
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| 71 |
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| 72 | #define _IBA_SET_MEM(field_struct, field_offset, type, num_bits, ptr, in, \
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| 73 | bytes) \
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| 74 | ({ \
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| 75 | const type *_in_ptr = in; \
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| 76 | WARN_ON(bytes * 8 > num_bits); \
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| 77 | if (in && bytes) \
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| 78 | memcpy(_IBA_GET_MEM_PTR(field_struct, field_offset, \
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| 79 | type, num_bits, ptr), \
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| 80 | _in_ptr, bytes); \
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| 81 | })
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| 82 | #define IBA_SET_MEM(field, ptr, in, bytes) _IBA_SET_MEM(field, ptr, in, bytes)
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| 83 |
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| 84 | #define _IBA_GET(field_struct, field_offset, field_mask, num_bits, ptr) \
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| 85 | ({ \
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| 86 | const field_struct *_ptr = ptr; \
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| 87 | (u##num_bits) FIELD_GET( \
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| 88 | field_mask, _iba_get##num_bits((const void *)_ptr + \
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| 89 | (field_offset))); \
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| 90 | })
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| 91 | #define IBA_GET(field, ptr) _IBA_GET(field, ptr)
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| 92 |
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| 93 | #define _IBA_GET_MEM(field_struct, field_offset, type, num_bits, ptr, out, \
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| 94 | bytes) \
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| 95 | ({ \
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| 96 | type *_out_ptr = out; \
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| 97 | WARN_ON(bytes * 8 > num_bits); \
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| 98 | if (out && bytes) \
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| 99 | memcpy(_out_ptr, \
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| 100 | _IBA_GET_MEM_PTR(field_struct, field_offset, \
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| 101 | type, num_bits, ptr), \
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| 102 | bytes); \
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| 103 | })
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| 104 | #define IBA_GET_MEM(field, ptr, out, bytes) _IBA_GET_MEM(field, ptr, out, bytes)
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| 105 |
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| 106 | |
| 107 | * The generated list becomes the parameters to the macros, the order is:
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| 108 | * - struct this applies to
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| 109 | * - starting offset of the max
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| 110 | * - GENMASK or GENMASK_ULL in CPU order
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| 111 | * - The width of data the mask operations should work on, in bits
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| 112 |
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| 113 |
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| 114 | |
| 115 | * Extraction using a tabular description like table 106. bit_offset is from
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| 116 | * the Byte[Bit] notation.
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| 117 |
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| 118 | #define IBA_FIELD_BLOC(field_struct, byte_offset, bit_offset, num_bits) \
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| 119 | field_struct, byte_offset, \
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| 120 | GENMASK(7 - (bit_offset), 7 - (bit_offset) - (num_bits - 1)), \
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| 121 | 8
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| 122 | #define IBA_FIELD8_LOC(field_struct, byte_offset, num_bits) \
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| 123 | IBA_FIELD_BLOC(field_struct, byte_offset, 0, num_bits)
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| 124 |
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| 125 | #define IBA_FIELD16_LOC(field_struct, byte_offset, num_bits) \
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| 126 | field_struct, (byte_offset)&0xFFFE, \
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| 127 | GENMASK(15 - (((byte_offset) % 2) * 8), \
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| 128 | 15 - (((byte_offset) % 2) * 8) - (num_bits - 1)), \
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| 129 | 16
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| 130 |
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| 131 | #define IBA_FIELD32_LOC(field_struct, byte_offset, num_bits) \
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| 132 | field_struct, (byte_offset)&0xFFFC, \
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| 133 | GENMASK(31 - (((byte_offset) % 4) * 8), \
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| 134 | 31 - (((byte_offset) % 4) * 8) - (num_bits - 1)), \
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| 135 | 32
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| 136 |
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| 137 | #define IBA_FIELD64_LOC(field_struct, byte_offset) \
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| 138 | field_struct, byte_offset, GENMASK_ULL(63, 0), 64
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| 139 | |
| 140 | * In IBTA spec, everything that is more than 64bits is multiple
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| 141 | * of bytes without leftover bits.
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| 142 |
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| 143 | #define IBA_FIELD_MLOC(field_struct, byte_offset, num_bits, type) \
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| 144 | field_struct, byte_offset, type, num_bits
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| 145 |
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| 146 | #endif
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