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[phantom] Add support for NetXen Phantom NICs
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Michael Brown
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Jul 5, 2008
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#ifndef _NX_BITOPS_H | ||
#define _NX_BITOPS_H | ||
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/* | ||
* Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>. | ||
* | ||
* This program is free software; you can redistribute it and/or | ||
* modify it under the terms of the GNU General Public License as | ||
* published by the Free Software Foundation; either version 2 of the | ||
* License, or any later version. | ||
* | ||
* This program is distributed in the hope that it will be useful, but | ||
* WITHOUT ANY WARRANTY; without even the implied warranty of | ||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
* General Public License for more details. | ||
* | ||
* You should have received a copy of the GNU General Public License | ||
* along with this program; if not, write to the Free Software | ||
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | ||
*/ | ||
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/** | ||
* @file | ||
* | ||
* NetXen bit operations | ||
* | ||
*/ | ||
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/** Datatype used to represent a bit in the pseudo-structures */ | ||
typedef unsigned char pseudo_bit_t; | ||
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/** | ||
* Wrapper structure for pseudo_bit_t structures | ||
* | ||
* This structure provides a wrapper around pseudo_bit_t structures. | ||
* It has the correct size, and also encapsulates type information | ||
* about the underlying pseudo_bit_t-based structure, which allows the | ||
* NX_FILL etc. macros to work without requiring explicit type | ||
* information. | ||
*/ | ||
#define NX_PSEUDO_BIT_STRUCT( _structure ) \ | ||
union { \ | ||
uint8_t bytes[ sizeof ( _structure ) / 8 ]; \ | ||
uint64_t qwords[ sizeof ( _structure ) / 64 ]; \ | ||
_structure *dummy[0]; \ | ||
} u; | ||
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/** Get pseudo_bit_t structure type from wrapper structure pointer */ | ||
#define NX_PSEUDO_STRUCT( _ptr ) \ | ||
typeof ( *((_ptr)->u.dummy[0]) ) | ||
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/** Bit offset of a field within a pseudo_bit_t structure */ | ||
#define NX_BIT_OFFSET( _ptr, _field ) \ | ||
offsetof ( NX_PSEUDO_STRUCT ( _ptr ), _field ) | ||
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/** Bit width of a field within a pseudo_bit_t structure */ | ||
#define NX_BIT_WIDTH( _ptr, _field ) \ | ||
sizeof ( ( ( NX_PSEUDO_STRUCT ( _ptr ) * ) NULL )->_field ) | ||
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/** Qword offset of a field within a pseudo_bit_t structure */ | ||
#define NX_QWORD_OFFSET( _ptr, _field ) \ | ||
( NX_BIT_OFFSET ( _ptr, _field ) / 64 ) | ||
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/** Qword bit offset of a field within a pseudo_bit_t structure | ||
* | ||
* Yes, using mod-64 would work, but would lose the check for the | ||
* error of specifying a mismatched field name and qword index. | ||
*/ | ||
#define NX_QWORD_BIT_OFFSET( _ptr, _index, _field ) \ | ||
( NX_BIT_OFFSET ( _ptr, _field ) - ( 64 * (_index) ) ) | ||
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/** Bit mask for a field within a pseudo_bit_t structure */ | ||
#define NX_BIT_MASK( _ptr, _field ) \ | ||
( ( ~( ( uint64_t ) 0 ) ) >> \ | ||
( 64 - NX_BIT_WIDTH ( _ptr, _field ) ) ) | ||
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/* | ||
* Assemble native-endian qword from named fields and values | ||
* | ||
*/ | ||
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#define NX_ASSEMBLE_1( _ptr, _index, _field, _value ) \ | ||
( ( ( uint64_t) (_value) ) << \ | ||
NX_QWORD_BIT_OFFSET ( _ptr, _index, _field ) ) | ||
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#define NX_ASSEMBLE_2( _ptr, _index, _field, _value, ... ) \ | ||
( NX_ASSEMBLE_1 ( _ptr, _index, _field, _value ) | \ | ||
NX_ASSEMBLE_1 ( _ptr, _index, __VA_ARGS__ ) ) | ||
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#define NX_ASSEMBLE_3( _ptr, _index, _field, _value, ... ) \ | ||
( NX_ASSEMBLE_1 ( _ptr, _index, _field, _value ) | \ | ||
NX_ASSEMBLE_2 ( _ptr, _index, __VA_ARGS__ ) ) | ||
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#define NX_ASSEMBLE_4( _ptr, _index, _field, _value, ... ) \ | ||
( NX_ASSEMBLE_1 ( _ptr, _index, _field, _value ) | \ | ||
NX_ASSEMBLE_3 ( _ptr, _index, __VA_ARGS__ ) ) | ||
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#define NX_ASSEMBLE_5( _ptr, _index, _field, _value, ... ) \ | ||
( NX_ASSEMBLE_1 ( _ptr, _index, _field, _value ) | \ | ||
NX_ASSEMBLE_4 ( _ptr, _index, __VA_ARGS__ ) ) | ||
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#define NX_ASSEMBLE_6( _ptr, _index, _field, _value, ... ) \ | ||
( NX_ASSEMBLE_1 ( _ptr, _index, _field, _value ) | \ | ||
NX_ASSEMBLE_5 ( _ptr, _index, __VA_ARGS__ ) ) | ||
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#define NX_ASSEMBLE_7( _ptr, _index, _field, _value, ... ) \ | ||
( NX_ASSEMBLE_1 ( _ptr, _index, _field, _value ) | \ | ||
NX_ASSEMBLE_6 ( _ptr, _index, __VA_ARGS__ ) ) | ||
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/* | ||
* Build native-endian (positive) qword bitmasks from named fields | ||
* | ||
*/ | ||
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#define NX_MASK_1( _ptr, _index, _field ) \ | ||
( NX_BIT_MASK ( _ptr, _field ) << \ | ||
NX_QWORD_BIT_OFFSET ( _ptr, _index, _field ) ) | ||
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#define NX_MASK_2( _ptr, _index, _field, ... ) \ | ||
( NX_MASK_1 ( _ptr, _index, _field ) | \ | ||
NX_MASK_1 ( _ptr, _index, __VA_ARGS__ ) ) | ||
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#define NX_MASK_3( _ptr, _index, _field, ... ) \ | ||
( NX_MASK_1 ( _ptr, _index, _field ) | \ | ||
NX_MASK_2 ( _ptr, _index, __VA_ARGS__ ) ) | ||
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#define NX_MASK_4( _ptr, _index, _field, ... ) \ | ||
( NX_MASK_1 ( _ptr, _index, _field ) | \ | ||
NX_MASK_3 ( _ptr, _index, __VA_ARGS__ ) ) | ||
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#define NX_MASK_5( _ptr, _index, _field, ... ) \ | ||
( NX_MASK_1 ( _ptr, _index, _field ) | \ | ||
NX_MASK_4 ( _ptr, _index, __VA_ARGS__ ) ) | ||
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#define NX_MASK_6( _ptr, _index, _field, ... ) \ | ||
( NX_MASK_1 ( _ptr, _index, _field ) | \ | ||
NX_MASK_5 ( _ptr, _index, __VA_ARGS__ ) ) | ||
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#define NX_MASK_7( _ptr, _index, _field, ... ) \ | ||
( NX_MASK_1 ( _ptr, _index, _field ) | \ | ||
NX_MASK_6 ( _ptr, _index, __VA_ARGS__ ) ) | ||
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/* | ||
* Populate big-endian qwords from named fields and values | ||
* | ||
*/ | ||
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#define NX_FILL( _ptr, _index, _assembled ) \ | ||
do { \ | ||
uint64_t *__ptr = &(_ptr)->u.qwords[(_index)]; \ | ||
uint64_t __assembled = (_assembled); \ | ||
*__ptr = cpu_to_le64 ( __assembled ); \ | ||
} while ( 0 ) | ||
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#define NX_FILL_1( _ptr, _index, ... ) \ | ||
NX_FILL ( _ptr, _index, NX_ASSEMBLE_1 ( _ptr, _index, __VA_ARGS__ ) ) | ||
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#define NX_FILL_2( _ptr, _index, ... ) \ | ||
NX_FILL ( _ptr, _index, NX_ASSEMBLE_2 ( _ptr, _index, __VA_ARGS__ ) ) | ||
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#define NX_FILL_3( _ptr, _index, ... ) \ | ||
NX_FILL ( _ptr, _index, NX_ASSEMBLE_3 ( _ptr, _index, __VA_ARGS__ ) ) | ||
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#define NX_FILL_4( _ptr, _index, ... ) \ | ||
NX_FILL ( _ptr, _index, NX_ASSEMBLE_4 ( _ptr, _index, __VA_ARGS__ ) ) | ||
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#define NX_FILL_5( _ptr, _index, ... ) \ | ||
NX_FILL ( _ptr, _index, NX_ASSEMBLE_5 ( _ptr, _index, __VA_ARGS__ ) ) | ||
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#define NX_FILL_6( _ptr, _index, ... ) \ | ||
NX_FILL ( _ptr, _index, NX_ASSEMBLE_6 ( _ptr, _index, __VA_ARGS__ ) ) | ||
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#define NX_FILL_7( _ptr, _index, ... ) \ | ||
NX_FILL ( _ptr, _index, NX_ASSEMBLE_7 ( _ptr, _index, __VA_ARGS__ ) ) | ||
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/** Extract value of named field */ | ||
#define NX_GET64( _ptr, _field ) \ | ||
( { \ | ||
unsigned int __index = NX_QWORD_OFFSET ( _ptr, _field ); \ | ||
uint64_t *__ptr = &(_ptr)->u.qwords[__index]; \ | ||
uint64_t __value = le64_to_cpu ( *__ptr ); \ | ||
__value >>= \ | ||
NX_QWORD_BIT_OFFSET ( _ptr, __index, _field ); \ | ||
__value &= NX_BIT_MASK ( _ptr, _field ); \ | ||
__value; \ | ||
} ) | ||
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/** Extract value of named field (for fields up to the size of a long) */ | ||
#define NX_GET( _ptr, _field ) \ | ||
( ( unsigned long ) NX_GET64 ( _ptr, _field ) ) | ||
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#endif /* _NX_BITOPS_H */ |
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