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358 lines
11 KiB
358 lines
11 KiB
From: Felix Fietkau <nbd@nbd.name>
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Date: Sat, 10 Feb 2018 12:45:47 +0100
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Subject: [PATCH] mac80211: minstrel: reduce minstrel_mcs_groups size
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By storing a shift value for all duration values of a group, we can
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reduce precision by a neglegible amount to make it fit into a u16 value.
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This improves cache footprint and reduces size:
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Before:
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text data bss dec hex filename
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10024 116 0 10140 279c rc80211_minstrel_ht.o
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After:
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text data bss dec hex filename
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9368 116 0 9484 250c rc80211_minstrel_ht.o
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/net/mac80211/rc80211_minstrel_ht.c
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+++ b/net/mac80211/rc80211_minstrel_ht.c
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@@ -52,22 +52,23 @@
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_streams - 1
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/* MCS rate information for an MCS group */
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-#define MCS_GROUP(_streams, _sgi, _ht40) \
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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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.flags = \
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IEEE80211_TX_RC_MCS | \
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(_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) | \
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(_ht40 ? IEEE80211_TX_RC_40_MHZ_WIDTH : 0), \
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.duration = { \
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- MCS_DURATION(_streams, _sgi, _ht40 ? 54 : 26), \
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- MCS_DURATION(_streams, _sgi, _ht40 ? 108 : 52), \
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- MCS_DURATION(_streams, _sgi, _ht40 ? 162 : 78), \
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- MCS_DURATION(_streams, _sgi, _ht40 ? 216 : 104), \
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- MCS_DURATION(_streams, _sgi, _ht40 ? 324 : 156), \
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- MCS_DURATION(_streams, _sgi, _ht40 ? 432 : 208), \
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- MCS_DURATION(_streams, _sgi, _ht40 ? 486 : 234), \
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- MCS_DURATION(_streams, _sgi, _ht40 ? 540 : 260) \
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+ MCS_DURATION(_streams, _sgi, _ht40 ? 54 : 26) >> _s, \
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+ MCS_DURATION(_streams, _sgi, _ht40 ? 108 : 52) >> _s, \
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+ MCS_DURATION(_streams, _sgi, _ht40 ? 162 : 78) >> _s, \
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+ MCS_DURATION(_streams, _sgi, _ht40 ? 216 : 104) >> _s, \
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+ MCS_DURATION(_streams, _sgi, _ht40 ? 324 : 156) >> _s, \
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+ MCS_DURATION(_streams, _sgi, _ht40 ? 432 : 208) >> _s, \
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+ MCS_DURATION(_streams, _sgi, _ht40 ? 486 : 234) >> _s, \
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+ MCS_DURATION(_streams, _sgi, _ht40 ? 540 : 260) >> _s \
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} \
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}
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@@ -80,9 +81,10 @@
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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) \
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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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.flags = \
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IEEE80211_TX_RC_VHT_MCS | \
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(_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) | \
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@@ -90,25 +92,25 @@
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_bw == BW_40 ? IEEE80211_TX_RC_40_MHZ_WIDTH : 0), \
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.duration = { \
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MCS_DURATION(_streams, _sgi, \
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- BW2VBPS(_bw, 117, 54, 26)), \
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+ BW2VBPS(_bw, 117, 54, 26)) >> _s, \
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MCS_DURATION(_streams, _sgi, \
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- BW2VBPS(_bw, 234, 108, 52)), \
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+ BW2VBPS(_bw, 234, 108, 52)) >> _s, \
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MCS_DURATION(_streams, _sgi, \
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- BW2VBPS(_bw, 351, 162, 78)), \
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+ BW2VBPS(_bw, 351, 162, 78)) >> _s, \
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MCS_DURATION(_streams, _sgi, \
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- BW2VBPS(_bw, 468, 216, 104)), \
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+ BW2VBPS(_bw, 468, 216, 104)) >> _s, \
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MCS_DURATION(_streams, _sgi, \
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- BW2VBPS(_bw, 702, 324, 156)), \
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+ BW2VBPS(_bw, 702, 324, 156)) >> _s, \
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MCS_DURATION(_streams, _sgi, \
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- BW2VBPS(_bw, 936, 432, 208)), \
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+ BW2VBPS(_bw, 936, 432, 208)) >> _s, \
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MCS_DURATION(_streams, _sgi, \
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- BW2VBPS(_bw, 1053, 486, 234)), \
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+ BW2VBPS(_bw, 1053, 486, 234)) >> _s, \
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MCS_DURATION(_streams, _sgi, \
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- BW2VBPS(_bw, 1170, 540, 260)), \
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+ BW2VBPS(_bw, 1170, 540, 260)) >> _s, \
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MCS_DURATION(_streams, _sgi, \
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- BW2VBPS(_bw, 1404, 648, 312)), \
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+ BW2VBPS(_bw, 1404, 648, 312)) >> _s, \
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MCS_DURATION(_streams, _sgi, \
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- BW2VBPS(_bw, 1560, 720, 346)) \
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+ BW2VBPS(_bw, 1560, 720, 346)) >> _s \
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} \
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}
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@@ -121,19 +123,20 @@
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(CCK_DURATION((_bitrate > 10 ? 20 : 10), false, 60) + \
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CCK_DURATION(_bitrate, _short, AVG_PKT_SIZE))
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-#define CCK_DURATION_LIST(_short) \
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- CCK_ACK_DURATION(10, _short), \
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- CCK_ACK_DURATION(20, _short), \
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- CCK_ACK_DURATION(55, _short), \
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- CCK_ACK_DURATION(110, _short)
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+#define CCK_DURATION_LIST(_short, _s) \
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+ CCK_ACK_DURATION(10, _short) >> _s, \
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+ CCK_ACK_DURATION(20, _short) >> _s, \
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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 \
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+#define CCK_GROUP(_s) \
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[MINSTREL_CCK_GROUP] = { \
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.streams = 0, \
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.flags = 0, \
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+ .shift = _s, \
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.duration = { \
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- CCK_DURATION_LIST(false), \
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- CCK_DURATION_LIST(true) \
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+ CCK_DURATION_LIST(false, _s), \
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+ CCK_DURATION_LIST(true, _s) \
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} \
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}
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@@ -151,47 +154,47 @@ 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),
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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(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(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(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(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(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(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(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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- CCK_GROUP,
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+ CCK_GROUP(8),
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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(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(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(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(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(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(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(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(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(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(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(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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};
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static u8 sample_table[SAMPLE_COLUMNS][MCS_GROUP_RATES] __read_mostly;
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@@ -307,7 +310,8 @@ minstrel_ht_get_tp_avg(struct minstrel_h
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if (group != MINSTREL_CCK_GROUP)
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nsecs = 1000 * mi->overhead / MINSTREL_TRUNC(mi->avg_ampdu_len);
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- nsecs += minstrel_mcs_groups[group].duration[rate];
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+ nsecs += minstrel_mcs_groups[group].duration[rate] <<
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+ minstrel_mcs_groups[group].shift;
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/*
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* For the throughput calculation, limit the probability value to 90% to
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@@ -755,12 +759,19 @@ minstrel_ht_tx_status(void *priv, struct
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minstrel_ht_update_rates(mp, mi);
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}
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+static inline int
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+minstrel_get_duration(int index)
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+{
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+ const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES];
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+ unsigned int duration = group->duration[index % MCS_GROUP_RATES];
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+ return duration << group->shift;
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+}
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+
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static void
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minstrel_calc_retransmit(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
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int index)
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{
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struct minstrel_rate_stats *mrs;
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- const struct mcs_group *group;
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unsigned int tx_time, tx_time_rtscts, tx_time_data;
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unsigned int cw = mp->cw_min;
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unsigned int ctime = 0;
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@@ -779,8 +790,7 @@ minstrel_calc_retransmit(struct minstrel
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mrs->retry_count_rtscts = 2;
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mrs->retry_updated = true;
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- group = &minstrel_mcs_groups[index / MCS_GROUP_RATES];
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- tx_time_data = group->duration[index % MCS_GROUP_RATES] * ampdu_len / 1000;
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+ tx_time_data = minstrel_get_duration(index) * ampdu_len / 1000;
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/* Contention time for first 2 tries */
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ctime = (t_slot * cw) >> 1;
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@@ -874,20 +884,24 @@ minstrel_ht_get_max_amsdu_len(struct min
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int group = mi->max_prob_rate / MCS_GROUP_RATES;
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const struct mcs_group *g = &minstrel_mcs_groups[group];
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int rate = mi->max_prob_rate % MCS_GROUP_RATES;
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+ unsigned int duration;
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/* Disable A-MSDU if max_prob_rate is bad */
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if (mi->groups[group].rates[rate].prob_ewma < MINSTREL_FRAC(50, 100))
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return 1;
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+ duration = g->duration[rate];
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+ duration <<= g->shift;
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+
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/* If the rate is slower than single-stream MCS1, make A-MSDU limit small */
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- if (g->duration[rate] > MCS_DURATION(1, 0, 52))
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+ if (duration > MCS_DURATION(1, 0, 52))
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return 500;
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/*
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* If the rate is slower than single-stream MCS4, limit A-MSDU to usual
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* data packet size
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*/
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- if (g->duration[rate] > MCS_DURATION(1, 0, 104))
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+ if (duration > MCS_DURATION(1, 0, 104))
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return 1600;
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/*
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@@ -895,7 +909,7 @@ minstrel_ht_get_max_amsdu_len(struct min
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* rate success probability is less than 75%, limit A-MSDU to twice the usual
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* data packet size
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*/
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- if (g->duration[rate] > MCS_DURATION(1, 0, 260) ||
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+ if (duration > MCS_DURATION(1, 0, 260) ||
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(minstrel_ht_get_prob_ewma(mi, mi->max_tp_rate[0]) <
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MINSTREL_FRAC(75, 100)))
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return 3200;
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@@ -942,13 +956,6 @@ minstrel_ht_update_rates(struct minstrel
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rate_control_set_rates(mp->hw, mi->sta, rates);
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}
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-static inline int
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-minstrel_get_duration(int index)
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-{
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- const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES];
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- return group->duration[index % MCS_GROUP_RATES];
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-}
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-
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static int
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minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
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{
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--- a/net/mac80211/rc80211_minstrel_ht.h
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+++ b/net/mac80211/rc80211_minstrel_ht.h
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@@ -33,9 +33,10 @@
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#define MCS_GROUP_RATES 10
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struct mcs_group {
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- u32 flags;
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- unsigned int streams;
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- unsigned int duration[MCS_GROUP_RATES];
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+ u16 flags;
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+ u8 streams;
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+ u8 shift;
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+ u16 duration[MCS_GROUP_RATES];
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};
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extern const struct mcs_group minstrel_mcs_groups[];
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--- a/net/mac80211/rc80211_minstrel_ht_debugfs.c
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+++ b/net/mac80211/rc80211_minstrel_ht_debugfs.c
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@@ -58,6 +58,7 @@ minstrel_ht_stats_dump(struct minstrel_h
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static const int bitrates[4] = { 10, 20, 55, 110 };
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int idx = i * MCS_GROUP_RATES + j;
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unsigned int prob_ewmsd;
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+ unsigned int duration;
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if (!(mi->supported[i] & BIT(j)))
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continue;
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@@ -95,7 +96,9 @@ minstrel_ht_stats_dump(struct minstrel_h
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p += sprintf(p, " %3u ", idx);
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/* tx_time[rate(i)] in usec */
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- tx_time = DIV_ROUND_CLOSEST(mg->duration[j], 1000);
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+ duration = mg->duration[j];
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+ duration <<= mg->shift;
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+ tx_time = DIV_ROUND_CLOSEST(duration, 1000);
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p += sprintf(p, "%6u ", tx_time);
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tp_max = minstrel_ht_get_tp_avg(mi, i, j, MINSTREL_FRAC(100, 100));
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@@ -204,6 +207,7 @@ minstrel_ht_stats_csv_dump(struct minstr
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static const int bitrates[4] = { 10, 20, 55, 110 };
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int idx = i * MCS_GROUP_RATES + j;
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unsigned int prob_ewmsd;
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+ unsigned int duration;
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if (!(mi->supported[i] & BIT(j)))
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continue;
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@@ -238,7 +242,10 @@ minstrel_ht_stats_csv_dump(struct minstr
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}
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p += sprintf(p, "%u,", idx);
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- tx_time = DIV_ROUND_CLOSEST(mg->duration[j], 1000);
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+
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+ duration = mg->duration[j];
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+ duration <<= mg->shift;
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+ tx_time = DIV_ROUND_CLOSEST(duration, 1000);
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p += sprintf(p, "%u,", tx_time);
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tp_max = minstrel_ht_get_tp_avg(mi, i, j, MINSTREL_FRAC(100, 100));
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