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Separated out to a clean new drivers/infiniband directory.
This commit is contained in:
Michael Brown
209
src/drivers/infiniband/mlx_bitops.h
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209
src/drivers/infiniband/mlx_bitops.h
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#ifndef _MLX_BITOPS_H
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#define _MLX_BITOPS_H
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/*
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* Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/**
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* @file
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*
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* Mellanox bit operations
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*
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*/
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/* Datatype used to represent a bit in the Mellanox autogenerated headers */
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typedef unsigned char pseudo_bit_t;
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/**
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* Wrapper structure for pseudo_bit_t structures
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*
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* This structure provides a wrapper around the autogenerated
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* pseudo_bit_t structures. It has the correct size, and also
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* encapsulates type information about the underlying pseudo_bit_t
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* structure, which allows the MLX_FILL etc. macros to work without
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* requiring explicit type information.
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*/
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#define MLX_DECLARE_STRUCT( _structure ) \
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_structure { \
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union { \
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uint8_t bytes[ sizeof ( struct _structure ## _st ) / 8 ]; \
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uint32_t dwords[ sizeof ( struct _structure ## _st ) / 32 ]; \
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struct _structure ## _st *dummy[0]; \
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} u; \
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}
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/** Get pseudo_bit_t structure type from wrapper structure pointer */
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#define MLX_PSEUDO_STRUCT( _ptr ) \
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typeof ( *((_ptr)->u.dummy[0]) )
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/** Bit offset of a field within a pseudo_bit_t structure */
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#define MLX_BIT_OFFSET( _structure_st, _field ) \
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offsetof ( _structure_st, _field )
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/** Dword offset of a field within a pseudo_bit_t structure */
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#define MLX_DWORD_OFFSET( _structure_st, _field ) \
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( MLX_BIT_OFFSET ( _structure_st, _field ) / 32 )
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/** Dword bit offset of a field within a pseudo_bit_t structure
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*
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* Yes, using mod-32 would work, but would lose the check for the
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* error of specifying a mismatched field name and dword index.
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*/
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#define MLX_DWORD_BIT_OFFSET( _structure_st, _index, _field ) \
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( MLX_BIT_OFFSET ( _structure_st, _field ) - ( 32 * (_index) ) )
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/** Bit width of a field within a pseudo_bit_t structure */
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#define MLX_BIT_WIDTH( _structure_st, _field ) \
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sizeof ( ( ( _structure_st * ) NULL )->_field )
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/** Bit mask for a field within a pseudo_bit_t structure */
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#define MLX_BIT_MASK( _structure_st, _field ) \
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( ( ~( ( uint32_t ) 0 ) ) >> \
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( 32 - MLX_BIT_WIDTH ( _structure_st, _field ) ) )
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/*
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* Assemble native-endian dword from named fields and values
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*
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*/
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#define MLX_ASSEMBLE_1( _structure_st, _index, _field, _value ) \
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( (_value) << MLX_DWORD_BIT_OFFSET ( _structure_st, _index, _field ) )
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#define MLX_ASSEMBLE_2( _structure_st, _index, _field, _value, ... ) \
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( MLX_ASSEMBLE_1 ( _structure_st, _index, _field, _value ) | \
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MLX_ASSEMBLE_1 ( _structure_st, _index, __VA_ARGS__ ) )
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#define MLX_ASSEMBLE_3( _structure_st, _index, _field, _value, ... ) \
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( MLX_ASSEMBLE_1 ( _structure_st, _index, _field, _value ) | \
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MLX_ASSEMBLE_2 ( _structure_st, _index, __VA_ARGS__ ) )
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#define MLX_ASSEMBLE_4( _structure_st, _index, _field, _value, ... ) \
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( MLX_ASSEMBLE_1 ( _structure_st, _index, _field, _value ) | \
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MLX_ASSEMBLE_3 ( _structure_st, _index, __VA_ARGS__ ) )
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#define MLX_ASSEMBLE_5( _structure_st, _index, _field, _value, ... ) \
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( MLX_ASSEMBLE_1 ( _structure_st, _index, _field, _value ) | \
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MLX_ASSEMBLE_4 ( _structure_st, _index, __VA_ARGS__ ) )
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#define MLX_ASSEMBLE_6( _structure_st, _index, _field, _value, ... ) \
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( MLX_ASSEMBLE_1 ( _structure_st, _index, _field, _value ) | \
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MLX_ASSEMBLE_5 ( _structure_st, _index, __VA_ARGS__ ) )
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/*
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* Build native-endian (positive) dword bitmasks from named fields
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*
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*/
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#define MLX_MASK_1( _structure_st, _index, _field ) \
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( MLX_BIT_MASK ( _structure_st, _field ) << \
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MLX_DWORD_BIT_OFFSET ( _structure_st, _index, _field ) )
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#define MLX_MASK_2( _structure_st, _index, _field, ... ) \
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( MLX_MASK_1 ( _structure_st, _index, _field ) | \
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MLX_MASK_1 ( _structure_st, _index, __VA_ARGS__ ) )
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#define MLX_MASK_3( _structure_st, _index, _field, ... ) \
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( MLX_MASK_1 ( _structure_st, _index, _field ) | \
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MLX_MASK_2 ( _structure_st, _index, __VA_ARGS__ ) )
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#define MLX_MASK_4( _structure_st, _index, _field, ... ) \
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( MLX_MASK_1 ( _structure_st, _index, _field ) | \
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MLX_MASK_3 ( _structure_st, _index, __VA_ARGS__ ) )
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#define MLX_MASK_5( _structure_st, _index, _field, ... ) \
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( MLX_MASK_1 ( _structure_st, _index, _field ) | \
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MLX_MASK_4 ( _structure_st, _index, __VA_ARGS__ ) )
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#define MLX_MASK_6( _structure_st, _index, _field, ... ) \
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( MLX_MASK_1 ( _structure_st, _index, _field ) | \
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MLX_MASK_5 ( _structure_st, _index, __VA_ARGS__ ) )
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/*
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* Populate big-endian dwords from named fields and values
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*
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*/
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#define MLX_FILL( _ptr, _index, _assembled ) \
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do { \
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uint32_t *__ptr = &(_ptr)->u.dwords[(_index)]; \
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uint32_t __assembled = (_assembled); \
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*__ptr = cpu_to_be32 ( __assembled ); \
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} while ( 0 )
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#define MLX_FILL_1( _ptr, _index, ... ) \
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MLX_FILL ( _ptr, _index, MLX_ASSEMBLE_1 ( MLX_PSEUDO_STRUCT ( _ptr ),\
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_index, __VA_ARGS__ ) )
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#define MLX_FILL_2( _ptr, _index, ... ) \
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MLX_FILL ( _ptr, _index, MLX_ASSEMBLE_2 ( MLX_PSEUDO_STRUCT ( _ptr ),\
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_index, __VA_ARGS__ ) )
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#define MLX_FILL_3( _ptr, _index, ... ) \
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MLX_FILL ( _ptr, _index, MLX_ASSEMBLE_3 ( MLX_PSEUDO_STRUCT ( _ptr ),\
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_index, __VA_ARGS__ ) )
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#define MLX_FILL_4( _ptr, _index, ... ) \
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MLX_FILL ( _ptr, _index, MLX_ASSEMBLE_4 ( MLX_PSEUDO_STRUCT ( _ptr ),\
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_index, __VA_ARGS__ ) )
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#define MLX_FILL_5( _ptr, _index, ... ) \
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MLX_FILL ( _ptr, _index, MLX_ASSEMBLE_5 ( MLX_PSEUDO_STRUCT ( _ptr ),\
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_index, __VA_ARGS__ ) )
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#define MLX_FILL_6( _ptr, _index, ... ) \
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MLX_FILL ( _ptr, _index, MLX_ASSEMBLE_6 ( MLX_PSEUDO_STRUCT ( _ptr ),\
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_index, __VA_ARGS__ ) )
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/*
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* Modify big-endian dword using named field and value
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*
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*/
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#define MLX_SET( _ptr, _field, _value ) \
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do { \
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unsigned int __index = \
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MLX_DWORD_OFFSET ( MLX_PSEUDO_STRUCT ( _ptr ), _field ); \
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uint32_t *__ptr = &(_ptr)->u.dwords[__index]; \
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uint32_t __value = be32_to_cpu ( *__ptr ); \
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__value &= ~( MLX_MASK_1 ( MLX_PSEUDO_STRUCT ( _ptr ), \
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__index, _field ) ); \
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__value |= MLX_ASSEMBLE_1 ( MLX_PSEUDO_STRUCT ( _ptr ), \
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__index, _field, _value ); \
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*__ptr = cpu_to_be32 ( __value ); \
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} while ( 0 )
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/*
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* Extract value of named field
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*
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*/
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#define MLX_GET( _ptr, _field ) \
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( { \
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unsigned int __index = \
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MLX_DWORD_OFFSET ( MLX_PSEUDO_STRUCT ( _ptr ), _field ); \
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uint32_t *__ptr = &(_ptr)->u.dwords[__index]; \
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uint32_t __value = be32_to_cpu ( *__ptr ); \
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__value >>= \
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MLX_DWORD_BIT_OFFSET ( MLX_PSEUDO_STRUCT ( _ptr ), \
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__index, _field ); \
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__value &= \
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MLX_BIT_MASK ( MLX_PSEUDO_STRUCT ( _ptr ), _field ); \
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__value; \
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} )
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#endif /* _MLX_BITOPS_H */
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