mac80211: minstrel_ht: automatically calculate rate duration shift
A per-group shift was added to reduce the size of the per-rate transmit duration field to u16 without sacrificing a lot of precision This patch changes the macros to automatically calculate the best value for this shift based on the lowest rate within the group. This simplifies adding more groups and slightly improves accuracy for some of the existing groups. Signed-off-by: Felix Fietkau <nbd@nbd.name> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Felix Fietkau
Johannes Berg
parent
7f2e12e1bf
commit
c2b17948fc
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@ -51,8 +51,13 @@
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MINSTREL_MAX_STREAMS * _sgi + \
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_streams - 1
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#define _MAX(a, b) (((a)>(b))?(a):(b))
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#define GROUP_SHIFT(duration) \
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_MAX(0, 16 - __builtin_clz(duration))
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/* MCS rate information for an MCS group */
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#define MCS_GROUP(_streams, _sgi, _ht40, _s) \
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#define __MCS_GROUP(_streams, _sgi, _ht40, _s) \
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[GROUP_IDX(_streams, _sgi, _ht40)] = { \
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.streams = _streams, \
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.shift = _s, \
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@ -72,6 +77,13 @@
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} \
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}
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#define MCS_GROUP_SHIFT(_streams, _sgi, _ht40) \
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GROUP_SHIFT(MCS_DURATION(_streams, _sgi, _ht40 ? 54 : 26))
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#define MCS_GROUP(_streams, _sgi, _ht40) \
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__MCS_GROUP(_streams, _sgi, _ht40, \
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MCS_GROUP_SHIFT(_streams, _sgi, _ht40))
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#define VHT_GROUP_IDX(_streams, _sgi, _bw) \
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(MINSTREL_VHT_GROUP_0 + \
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MINSTREL_MAX_STREAMS * 2 * (_bw) + \
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@ -81,7 +93,7 @@
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#define BW2VBPS(_bw, r3, r2, r1) \
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(_bw == BW_80 ? r3 : _bw == BW_40 ? r2 : r1)
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#define VHT_GROUP(_streams, _sgi, _bw, _s) \
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#define __VHT_GROUP(_streams, _sgi, _bw, _s) \
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[VHT_GROUP_IDX(_streams, _sgi, _bw)] = { \
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.streams = _streams, \
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.shift = _s, \
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@ -114,6 +126,14 @@
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} \
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}
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#define VHT_GROUP_SHIFT(_streams, _sgi, _bw) \
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GROUP_SHIFT(MCS_DURATION(_streams, _sgi, \
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BW2VBPS(_bw, 117, 54, 26)))
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#define VHT_GROUP(_streams, _sgi, _bw) \
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__VHT_GROUP(_streams, _sgi, _bw, \
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VHT_GROUP_SHIFT(_streams, _sgi, _bw))
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#define CCK_DURATION(_bitrate, _short, _len) \
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(1000 * (10 /* SIFS */ + \
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(_short ? 72 + 24 : 144 + 48) + \
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@ -129,7 +149,7 @@
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CCK_ACK_DURATION(55, _short) >> _s, \
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CCK_ACK_DURATION(110, _short) >> _s
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#define CCK_GROUP(_s) \
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#define __CCK_GROUP(_s) \
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[MINSTREL_CCK_GROUP] = { \
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.streams = 1, \
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.flags = 0, \
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@ -140,6 +160,12 @@
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} \
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}
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#define CCK_GROUP_SHIFT \
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GROUP_SHIFT(CCK_ACK_DURATION(10, false))
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#define CCK_GROUP __CCK_GROUP(CCK_GROUP_SHIFT)
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static bool minstrel_vht_only = true;
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module_param(minstrel_vht_only, bool, 0644);
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MODULE_PARM_DESC(minstrel_vht_only,
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@ -154,57 +180,57 @@ MODULE_PARM_DESC(minstrel_vht_only,
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* BW -> SGI -> #streams
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*/
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const struct mcs_group minstrel_mcs_groups[] = {
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MCS_GROUP(1, 0, BW_20, 5),
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MCS_GROUP(2, 0, BW_20, 4),
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MCS_GROUP(3, 0, BW_20, 4),
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MCS_GROUP(4, 0, BW_20, 4),
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MCS_GROUP(1, 0, BW_20),
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MCS_GROUP(2, 0, BW_20),
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MCS_GROUP(3, 0, BW_20),
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MCS_GROUP(4, 0, BW_20),
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MCS_GROUP(1, 1, BW_20, 5),
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MCS_GROUP(2, 1, BW_20, 4),
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MCS_GROUP(3, 1, BW_20, 4),
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MCS_GROUP(4, 1, BW_20, 4),
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MCS_GROUP(1, 1, BW_20),
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MCS_GROUP(2, 1, BW_20),
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MCS_GROUP(3, 1, BW_20),
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MCS_GROUP(4, 1, BW_20),
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MCS_GROUP(1, 0, BW_40, 4),
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MCS_GROUP(2, 0, BW_40, 4),
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MCS_GROUP(3, 0, BW_40, 4),
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MCS_GROUP(4, 0, BW_40, 4),
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MCS_GROUP(1, 0, BW_40),
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MCS_GROUP(2, 0, BW_40),
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MCS_GROUP(3, 0, BW_40),
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MCS_GROUP(4, 0, BW_40),
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MCS_GROUP(1, 1, BW_40, 4),
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MCS_GROUP(2, 1, BW_40, 4),
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MCS_GROUP(3, 1, BW_40, 4),
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MCS_GROUP(4, 1, BW_40, 4),
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MCS_GROUP(1, 1, BW_40),
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MCS_GROUP(2, 1, BW_40),
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MCS_GROUP(3, 1, BW_40),
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MCS_GROUP(4, 1, BW_40),
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CCK_GROUP(8),
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CCK_GROUP,
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VHT_GROUP(1, 0, BW_20, 5),
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VHT_GROUP(2, 0, BW_20, 4),
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VHT_GROUP(3, 0, BW_20, 4),
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VHT_GROUP(4, 0, BW_20, 4),
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VHT_GROUP(1, 0, BW_20),
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VHT_GROUP(2, 0, BW_20),
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VHT_GROUP(3, 0, BW_20),
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VHT_GROUP(4, 0, BW_20),
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VHT_GROUP(1, 1, BW_20, 5),
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VHT_GROUP(2, 1, BW_20, 4),
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VHT_GROUP(3, 1, BW_20, 4),
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VHT_GROUP(4, 1, BW_20, 4),
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VHT_GROUP(1, 1, BW_20),
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VHT_GROUP(2, 1, BW_20),
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VHT_GROUP(3, 1, BW_20),
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VHT_GROUP(4, 1, BW_20),
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VHT_GROUP(1, 0, BW_40, 4),
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VHT_GROUP(2, 0, BW_40, 4),
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VHT_GROUP(3, 0, BW_40, 4),
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VHT_GROUP(4, 0, BW_40, 3),
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VHT_GROUP(1, 0, BW_40),
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VHT_GROUP(2, 0, BW_40),
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VHT_GROUP(3, 0, BW_40),
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VHT_GROUP(4, 0, BW_40),
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VHT_GROUP(1, 1, BW_40, 4),
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VHT_GROUP(2, 1, BW_40, 4),
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VHT_GROUP(3, 1, BW_40, 4),
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VHT_GROUP(4, 1, BW_40, 3),
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VHT_GROUP(1, 1, BW_40),
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VHT_GROUP(2, 1, BW_40),
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VHT_GROUP(3, 1, BW_40),
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VHT_GROUP(4, 1, BW_40),
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VHT_GROUP(1, 0, BW_80, 4),
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VHT_GROUP(2, 0, BW_80, 4),
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VHT_GROUP(3, 0, BW_80, 4),
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VHT_GROUP(4, 0, BW_80, 2),
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VHT_GROUP(1, 0, BW_80),
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VHT_GROUP(2, 0, BW_80),
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VHT_GROUP(3, 0, BW_80),
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VHT_GROUP(4, 0, BW_80),
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VHT_GROUP(1, 1, BW_80, 4),
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VHT_GROUP(2, 1, BW_80, 4),
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VHT_GROUP(3, 1, BW_80, 4),
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VHT_GROUP(4, 1, BW_80, 2),
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VHT_GROUP(1, 1, BW_80),
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VHT_GROUP(2, 1, BW_80),
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VHT_GROUP(3, 1, BW_80),
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VHT_GROUP(4, 1, BW_80),
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};
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static u8 sample_table[SAMPLE_COLUMNS][MCS_GROUP_RATES] __read_mostly;
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