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1/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */2/*3 * Copyright (c) 2020, Mellanox Technologies inc. All rights reserved.4 */5#ifndef _IBA_DEFS_H_6#define _IBA_DEFS_H_7 8#include <linux/kernel.h>9#include <linux/bitfield.h>10#include <linux/unaligned.h>11 12static inline u32 _iba_get8(const u8 *ptr)13{14 return *ptr;15}16 17static inline void _iba_set8(u8 *ptr, u32 mask, u32 prep_value)18{19 *ptr = (*ptr & ~mask) | prep_value;20}21 22static inline u16 _iba_get16(const __be16 *ptr)23{24 return be16_to_cpu(*ptr);25}26 27static inline void _iba_set16(__be16 *ptr, u16 mask, u16 prep_value)28{29 *ptr = cpu_to_be16((be16_to_cpu(*ptr) & ~mask) | prep_value);30}31 32static inline u32 _iba_get32(const __be32 *ptr)33{34 return be32_to_cpu(*ptr);35}36 37static inline void _iba_set32(__be32 *ptr, u32 mask, u32 prep_value)38{39 *ptr = cpu_to_be32((be32_to_cpu(*ptr) & ~mask) | prep_value);40}41 42static inline u64 _iba_get64(const __be64 *ptr)43{44 /*45 * The mads are constructed so that 32 bit and smaller are naturally46 * aligned, everything larger has a max alignment of 4 bytes.47 */48 return be64_to_cpu(get_unaligned(ptr));49}50 51static inline void _iba_set64(__be64 *ptr, u64 mask, u64 prep_value)52{53 put_unaligned(cpu_to_be64((_iba_get64(ptr) & ~mask) | prep_value), ptr);54}55 56#define _IBA_SET(field_struct, field_offset, field_mask, num_bits, ptr, value) \57 ({ \58 field_struct *_ptr = ptr; \59 _iba_set##num_bits((void *)_ptr + (field_offset), field_mask, \60 FIELD_PREP(field_mask, value)); \61 })62#define IBA_SET(field, ptr, value) _IBA_SET(field, ptr, value)63 64#define _IBA_GET_MEM_PTR(field_struct, field_offset, type, num_bits, ptr) \65 ({ \66 field_struct *_ptr = ptr; \67 (type *)((void *)_ptr + (field_offset)); \68 })69#define IBA_GET_MEM_PTR(field, ptr) _IBA_GET_MEM_PTR(field, ptr)70 71/* FIXME: A set should always set the entire field, meaning we should zero the trailing bytes */72#define _IBA_SET_MEM(field_struct, field_offset, type, num_bits, ptr, in, \73 bytes) \74 ({ \75 const type *_in_ptr = in; \76 WARN_ON(bytes * 8 > num_bits); \77 if (in && bytes) \78 memcpy(_IBA_GET_MEM_PTR(field_struct, field_offset, \79 type, num_bits, ptr), \80 _in_ptr, bytes); \81 })82#define IBA_SET_MEM(field, ptr, in, bytes) _IBA_SET_MEM(field, ptr, in, bytes)83 84#define _IBA_GET(field_struct, field_offset, field_mask, num_bits, ptr) \85 ({ \86 const field_struct *_ptr = ptr; \87 (u##num_bits) FIELD_GET( \88 field_mask, _iba_get##num_bits((const void *)_ptr + \89 (field_offset))); \90 })91#define IBA_GET(field, ptr) _IBA_GET(field, ptr)92 93#define _IBA_GET_MEM(field_struct, field_offset, type, num_bits, ptr, out, \94 bytes) \95 ({ \96 type *_out_ptr = out; \97 WARN_ON(bytes * 8 > num_bits); \98 if (out && bytes) \99 memcpy(_out_ptr, \100 _IBA_GET_MEM_PTR(field_struct, field_offset, \101 type, num_bits, ptr), \102 bytes); \103 })104#define IBA_GET_MEM(field, ptr, out, bytes) _IBA_GET_MEM(field, ptr, out, bytes)105 106/*107 * The generated list becomes the parameters to the macros, the order is:108 * - struct this applies to109 * - starting offset of the max110 * - GENMASK or GENMASK_ULL in CPU order111 * - The width of data the mask operations should work on, in bits112 */113 114/*115 * Extraction using a tabular description like table 106. bit_offset is from116 * the Byte[Bit] notation.117 */118#define IBA_FIELD_BLOC(field_struct, byte_offset, bit_offset, num_bits) \119 field_struct, byte_offset, \120 GENMASK(7 - (bit_offset), 7 - (bit_offset) - (num_bits - 1)), \121 8122#define IBA_FIELD8_LOC(field_struct, byte_offset, num_bits) \123 IBA_FIELD_BLOC(field_struct, byte_offset, 0, num_bits)124 125#define IBA_FIELD16_LOC(field_struct, byte_offset, num_bits) \126 field_struct, (byte_offset)&0xFFFE, \127 GENMASK(15 - (((byte_offset) % 2) * 8), \128 15 - (((byte_offset) % 2) * 8) - (num_bits - 1)), \129 16130 131#define IBA_FIELD32_LOC(field_struct, byte_offset, num_bits) \132 field_struct, (byte_offset)&0xFFFC, \133 GENMASK(31 - (((byte_offset) % 4) * 8), \134 31 - (((byte_offset) % 4) * 8) - (num_bits - 1)), \135 32136 137#define IBA_FIELD64_LOC(field_struct, byte_offset) \138 field_struct, byte_offset, GENMASK_ULL(63, 0), 64139/*140 * In IBTA spec, everything that is more than 64bits is multiple141 * of bytes without leftover bits.142 */143#define IBA_FIELD_MLOC(field_struct, byte_offset, num_bits, type) \144 field_struct, byte_offset, type, num_bits145 146#endif /* _IBA_DEFS_H_ */147