mac80211: add rate control support for 4 spatial streams, improve precision

Signed-off-by: Felix Fietkau <[email protected]>

package/kernel/mac80211/patches/subsys/361-mac80211-minstrel_ht-add-support-for-rates-with-4-sp.patch

@@ -0,0 +1,78 @@
+From: Felix Fietkau <[email protected]>
+Date: Mon, 25 Mar 2019 09:02:13 +0100
+Subject: [PATCH] mac80211: minstrel_ht: add support for rates with 4
+ spatial streams
+
+This is needed for the upcoming driver for MT7615 4x4 802.11ac chipsets
+
+Signed-off-by: Felix Fietkau <[email protected]>
+---
+
+--- a/net/mac80211/rc80211_minstrel_ht.c
++++ b/net/mac80211/rc80211_minstrel_ht.c
+@@ -157,44 +157,54 @@ const struct mcs_group minstrel_mcs_grou
+ 	MCS_GROUP(1, 0, BW_20, 5),
+ 	MCS_GROUP(2, 0, BW_20, 4),
+ 	MCS_GROUP(3, 0, BW_20, 4),
++	MCS_GROUP(4, 0, BW_20, 4),
+ 
+ 	MCS_GROUP(1, 1, BW_20, 5),
+ 	MCS_GROUP(2, 1, BW_20, 4),
+ 	MCS_GROUP(3, 1, BW_20, 4),
++	MCS_GROUP(4, 1, BW_20, 4),
+ 
+ 	MCS_GROUP(1, 0, BW_40, 4),
+ 	MCS_GROUP(2, 0, BW_40, 4),
+ 	MCS_GROUP(3, 0, BW_40, 4),
++	MCS_GROUP(4, 0, BW_40, 4),
+ 
+ 	MCS_GROUP(1, 1, BW_40, 4),
+ 	MCS_GROUP(2, 1, BW_40, 4),
+ 	MCS_GROUP(3, 1, BW_40, 4),
++	MCS_GROUP(4, 1, BW_40, 4),
+ 
+ 	CCK_GROUP(8),
+ 
+ 	VHT_GROUP(1, 0, BW_20, 5),
+ 	VHT_GROUP(2, 0, BW_20, 4),
+ 	VHT_GROUP(3, 0, BW_20, 4),
++	VHT_GROUP(4, 0, BW_20, 4),
+ 
+ 	VHT_GROUP(1, 1, BW_20, 5),
+ 	VHT_GROUP(2, 1, BW_20, 4),
+ 	VHT_GROUP(3, 1, BW_20, 4),
++	VHT_GROUP(4, 1, BW_20, 4),
+ 
+ 	VHT_GROUP(1, 0, BW_40, 4),
+ 	VHT_GROUP(2, 0, BW_40, 4),
+ 	VHT_GROUP(3, 0, BW_40, 4),
++	VHT_GROUP(4, 0, BW_40, 3),
+ 
+ 	VHT_GROUP(1, 1, BW_40, 4),
+ 	VHT_GROUP(2, 1, BW_40, 4),
+ 	VHT_GROUP(3, 1, BW_40, 4),
++	VHT_GROUP(4, 1, BW_40, 3),
+ 
+ 	VHT_GROUP(1, 0, BW_80, 4),
+ 	VHT_GROUP(2, 0, BW_80, 4),
+ 	VHT_GROUP(3, 0, BW_80, 4),
++	VHT_GROUP(4, 0, BW_80, 2),
+ 
+ 	VHT_GROUP(1, 1, BW_80, 4),
+ 	VHT_GROUP(2, 1, BW_80, 4),
+ 	VHT_GROUP(3, 1, BW_80, 4),
++	VHT_GROUP(4, 1, BW_80, 2),
+ };
+ 
+ static u8 sample_table[SAMPLE_COLUMNS][MCS_GROUP_RATES] __read_mostly;
+--- a/net/mac80211/rc80211_minstrel_ht.h
++++ b/net/mac80211/rc80211_minstrel_ht.h
+@@ -13,7 +13,7 @@
+  * The number of streams can be changed to 2 to reduce code
+  * size and memory footprint.
+  */
+-#define MINSTREL_MAX_STREAMS		3
++#define MINSTREL_MAX_STREAMS		4
+ #define MINSTREL_HT_STREAM_GROUPS	4 /* BW(=2) * SGI(=2) */
+ #define MINSTREL_VHT_STREAM_GROUPS	6 /* BW(=3) * SGI(=2) */
+ 

package/kernel/mac80211/patches/subsys/362-mac80211-minstrel_ht-automatically-calculate-rate-du.patch

@@ -0,0 +1,189 @@
+From: Felix Fietkau <[email protected]>
+Date: Mon, 25 Mar 2019 09:02:52 +0100
+Subject: [PATCH] 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 <[email protected]>
+---
+
+--- a/net/mac80211/rc80211_minstrel_ht.c
++++ b/net/mac80211/rc80211_minstrel_ht.c
+@@ -51,8 +51,11 @@
+ 	MINSTREL_MAX_STREAMS * _sgi +	\
+ 	_streams - 1
+ 
++#define GROUP_SHIFT(duration)						\
++	(16 - __builtin_clz(duration))
++
+ /* MCS rate information for an MCS group */
+-#define MCS_GROUP(_streams, _sgi, _ht40, _s)				\
++#define __MCS_GROUP(_streams, _sgi, _ht40, _s)				\
+ 	[GROUP_IDX(_streams, _sgi, _ht40)] = {				\
+ 	.streams = _streams,						\
+ 	.shift = _s,							\
+@@ -72,6 +75,13 @@
+ 	}								\
+ }
+ 
++#define MCS_GROUP_SHIFT(_streams, _sgi, _ht40)				\
++	GROUP_SHIFT(MCS_DURATION(_streams, _sgi, _ht40 ? 54 : 26))
++
++#define MCS_GROUP(_streams, _sgi, _ht40)				\
++	__MCS_GROUP(_streams, _sgi, _ht40,				\
++		    MCS_GROUP_SHIFT(_streams, _sgi, _ht40))
++
+ #define VHT_GROUP_IDX(_streams, _sgi, _bw)				\
+ 	(MINSTREL_VHT_GROUP_0 +						\
+ 	 MINSTREL_MAX_STREAMS * 2 * (_bw) +				\
+@@ -81,7 +91,7 @@
+ #define BW2VBPS(_bw, r3, r2, r1)					\
+ 	(_bw == BW_80 ? r3 : _bw == BW_40 ? r2 : r1)
+ 
+-#define VHT_GROUP(_streams, _sgi, _bw, _s)				\
++#define __VHT_GROUP(_streams, _sgi, _bw, _s)				\
+ 	[VHT_GROUP_IDX(_streams, _sgi, _bw)] = {			\
+ 	.streams = _streams,						\
+ 	.shift = _s,							\
+@@ -114,6 +124,14 @@
+ 	}								\
+ }
+ 
++#define VHT_GROUP_SHIFT(_streams, _sgi, _bw)				\
++	GROUP_SHIFT(MCS_DURATION(_streams, _sgi,			\
++				 BW2VBPS(_bw,  117,  54,  26)))
++
++#define VHT_GROUP(_streams, _sgi, _bw)					\
++	__VHT_GROUP(_streams, _sgi, _bw,				\
++		    VHT_GROUP_SHIFT(_streams, _sgi, _bw))
++
+ #define CCK_DURATION(_bitrate, _short, _len)		\
+ 	(1000 * (10 /* SIFS */ +			\
+ 	 (_short ? 72 + 24 : 144 + 48) +		\
+@@ -129,7 +147,7 @@
+ 	CCK_ACK_DURATION(55, _short) >> _s,		\
+ 	CCK_ACK_DURATION(110, _short) >> _s
+ 
+-#define CCK_GROUP(_s)					\
++#define __CCK_GROUP(_s)					\
+ 	[MINSTREL_CCK_GROUP] = {			\
+ 		.streams = 1,				\
+ 		.flags = 0,				\
+@@ -140,6 +158,12 @@
+ 		}					\
+ 	}
+ 
++#define CCK_GROUP_SHIFT					\
++	GROUP_SHIFT(CCK_ACK_DURATION(10, false))
++
++#define CCK_GROUP __CCK_GROUP(CCK_GROUP_SHIFT)
++
++
+ static bool minstrel_vht_only = true;
+ module_param(minstrel_vht_only, bool, 0644);
+ MODULE_PARM_DESC(minstrel_vht_only,
+@@ -154,57 +178,57 @@ MODULE_PARM_DESC(minstrel_vht_only,
+  * BW -> SGI -> #streams
+  */
+ const struct mcs_group minstrel_mcs_groups[] = {
+-	MCS_GROUP(1, 0, BW_20, 5),
+-	MCS_GROUP(2, 0, BW_20, 4),
+-	MCS_GROUP(3, 0, BW_20, 4),
+-	MCS_GROUP(4, 0, BW_20, 4),
++	MCS_GROUP(1, 0, BW_20),
++	MCS_GROUP(2, 0, BW_20),
++	MCS_GROUP(3, 0, BW_20),
++	MCS_GROUP(4, 0, BW_20),
+ 
+-	MCS_GROUP(1, 1, BW_20, 5),
+-	MCS_GROUP(2, 1, BW_20, 4),
+-	MCS_GROUP(3, 1, BW_20, 4),
+-	MCS_GROUP(4, 1, BW_20, 4),
++	MCS_GROUP(1, 1, BW_20),
++	MCS_GROUP(2, 1, BW_20),
++	MCS_GROUP(3, 1, BW_20),
++	MCS_GROUP(4, 1, BW_20),
+ 
+-	MCS_GROUP(1, 0, BW_40, 4),
+-	MCS_GROUP(2, 0, BW_40, 4),
+-	MCS_GROUP(3, 0, BW_40, 4),
+-	MCS_GROUP(4, 0, BW_40, 4),
++	MCS_GROUP(1, 0, BW_40),
++	MCS_GROUP(2, 0, BW_40),
++	MCS_GROUP(3, 0, BW_40),
++	MCS_GROUP(4, 0, BW_40),
+ 
+-	MCS_GROUP(1, 1, BW_40, 4),
+-	MCS_GROUP(2, 1, BW_40, 4),
+-	MCS_GROUP(3, 1, BW_40, 4),
+-	MCS_GROUP(4, 1, BW_40, 4),
++	MCS_GROUP(1, 1, BW_40),
++	MCS_GROUP(2, 1, BW_40),
++	MCS_GROUP(3, 1, BW_40),
++	MCS_GROUP(4, 1, BW_40),
+ 
+-	CCK_GROUP(8),
++	CCK_GROUP,
+ 
+-	VHT_GROUP(1, 0, BW_20, 5),
+-	VHT_GROUP(2, 0, BW_20, 4),
+-	VHT_GROUP(3, 0, BW_20, 4),
+-	VHT_GROUP(4, 0, BW_20, 4),
++	VHT_GROUP(1, 0, BW_20),
++	VHT_GROUP(2, 0, BW_20),
++	VHT_GROUP(3, 0, BW_20),
++	VHT_GROUP(4, 0, BW_20),
+ 
+-	VHT_GROUP(1, 1, BW_20, 5),
+-	VHT_GROUP(2, 1, BW_20, 4),
+-	VHT_GROUP(3, 1, BW_20, 4),
+-	VHT_GROUP(4, 1, BW_20, 4),
++	VHT_GROUP(1, 1, BW_20),
++	VHT_GROUP(2, 1, BW_20),
++	VHT_GROUP(3, 1, BW_20),
++	VHT_GROUP(4, 1, BW_20),
+ 
+-	VHT_GROUP(1, 0, BW_40, 4),
+-	VHT_GROUP(2, 0, BW_40, 4),
+-	VHT_GROUP(3, 0, BW_40, 4),
+-	VHT_GROUP(4, 0, BW_40, 3),
++	VHT_GROUP(1, 0, BW_40),
++	VHT_GROUP(2, 0, BW_40),
++	VHT_GROUP(3, 0, BW_40),
++	VHT_GROUP(4, 0, BW_40),
+ 
+-	VHT_GROUP(1, 1, BW_40, 4),
+-	VHT_GROUP(2, 1, BW_40, 4),
+-	VHT_GROUP(3, 1, BW_40, 4),
+-	VHT_GROUP(4, 1, BW_40, 3),
++	VHT_GROUP(1, 1, BW_40),
++	VHT_GROUP(2, 1, BW_40),
++	VHT_GROUP(3, 1, BW_40),
++	VHT_GROUP(4, 1, BW_40),
+ 
+-	VHT_GROUP(1, 0, BW_80, 4),
+-	VHT_GROUP(2, 0, BW_80, 4),
+-	VHT_GROUP(3, 0, BW_80, 4),
+-	VHT_GROUP(4, 0, BW_80, 2),
++	VHT_GROUP(1, 0, BW_80),
++	VHT_GROUP(2, 0, BW_80),
++	VHT_GROUP(3, 0, BW_80),
++	VHT_GROUP(4, 0, BW_80),
+ 
+-	VHT_GROUP(1, 1, BW_80, 4),
+-	VHT_GROUP(2, 1, BW_80, 4),
+-	VHT_GROUP(3, 1, BW_80, 4),
+-	VHT_GROUP(4, 1, BW_80, 2),
++	VHT_GROUP(1, 1, BW_80),
++	VHT_GROUP(2, 1, BW_80),
++	VHT_GROUP(3, 1, BW_80),
++	VHT_GROUP(4, 1, BW_80),
+ };
+ 
+ static u8 sample_table[SAMPLE_COLUMNS][MCS_GROUP_RATES] __read_mostly;