mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-12-25 18:55:13 +02:00
de79b64c19
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@20497 3c298f89-4303-0410-b956-a3cf2f4a3e73
1138 lines
30 KiB
Diff
1138 lines
30 KiB
Diff
--- a/net/mac80211/Makefile
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+++ b/net/mac80211/Makefile
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@@ -47,8 +47,8 @@ CFLAGS_driver-trace.o := -I$(src)
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rc80211_pid-y := rc80211_pid_algo.o
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rc80211_pid-$(CONFIG_MAC80211_DEBUGFS) += rc80211_pid_debugfs.o
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-rc80211_minstrel-y := rc80211_minstrel.o
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-rc80211_minstrel-$(CONFIG_MAC80211_DEBUGFS) += rc80211_minstrel_debugfs.o
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+rc80211_minstrel-y := rc80211_minstrel.o rc80211_minstrel_ht.o
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+rc80211_minstrel-$(CONFIG_MAC80211_DEBUGFS) += rc80211_minstrel_debugfs.o rc80211_minstrel_ht_debugfs.o
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mac80211-$(CONFIG_MAC80211_RC_PID) += $(rc80211_pid-y)
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mac80211-$(CONFIG_MAC80211_RC_MINSTREL) += $(rc80211_minstrel-y)
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--- a/net/mac80211/main.c
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+++ b/net/mac80211/main.c
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@@ -714,6 +714,10 @@ static int __init ieee80211_init(void)
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if (ret)
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return ret;
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+ ret = rc80211_minstrel_ht_init();
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+ if (ret)
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+ goto err_minstrel;
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+
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ret = rc80211_pid_init();
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if (ret)
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goto err_pid;
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@@ -726,6 +730,8 @@ static int __init ieee80211_init(void)
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err_netdev:
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rc80211_pid_exit();
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err_pid:
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+ rc80211_minstrel_ht_exit();
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+ err_minstrel:
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rc80211_minstrel_exit();
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return ret;
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@@ -734,6 +740,7 @@ static int __init ieee80211_init(void)
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static void __exit ieee80211_exit(void)
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{
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rc80211_pid_exit();
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+ rc80211_minstrel_ht_exit();
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rc80211_minstrel_exit();
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/*
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--- a/net/mac80211/rate.h
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+++ b/net/mac80211/rate.h
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@@ -137,6 +137,8 @@ static inline void rc80211_pid_exit(void
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#ifdef CONFIG_MAC80211_RC_MINSTREL
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extern int rc80211_minstrel_init(void);
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extern void rc80211_minstrel_exit(void);
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+extern int rc80211_minstrel_ht_init(void);
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+extern void rc80211_minstrel_ht_exit(void);
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#else
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static inline int rc80211_minstrel_init(void)
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{
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@@ -145,6 +147,13 @@ static inline int rc80211_minstrel_init(
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static inline void rc80211_minstrel_exit(void)
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{
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}
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+static inline int rc80211_minstrel_ht_init(void)
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+{
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+ return 0;
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+}
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+static inline void rc80211_minstrel_ht_exit(void)
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+{
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+}
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#endif
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--- /dev/null
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+++ b/net/mac80211/rc80211_minstrel_ht.c
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@@ -0,0 +1,815 @@
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+/*
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+ * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ */
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+#include <linux/netdevice.h>
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+#include <linux/types.h>
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+#include <linux/skbuff.h>
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+#include <linux/debugfs.h>
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+#include <linux/random.h>
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+#include <linux/ieee80211.h>
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+#include <net/mac80211.h>
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+#include "rate.h"
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+#include "rc80211_minstrel.h"
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+#include "rc80211_minstrel_ht.h"
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+
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+#define AVG_PKT_SIZE 1200
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+#define SAMPLE_COLUMNS 10
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+#define EWMA_LEVEL 75
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+
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+/* Number of bits for an average sized packet */
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+#define MCS_NBITS (AVG_PKT_SIZE << 3)
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+
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+/* Number of symbols for a packet with (bps) bits per symbol */
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+#define MCS_NSYMS(bps) ((MCS_NBITS + (bps) - 1) / (bps))
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+
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+/* Transmission time for a packet containing (syms) symbols */
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+#define MCS_SYMBOL_TIME(sgi, syms) \
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+ (sgi ? \
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+ ((syms) * 18 + 4) / 5 : /* syms * 3.6 us */ \
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+ (syms) << 2 /* syms * 4 us */ \
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+ )
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+
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+/* Transmit duration for the raw data part of an average sized packet */
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+#define MCS_DURATION(streams, sgi, bps) MCS_SYMBOL_TIME(sgi, MCS_NSYMS((streams) * (bps)))
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+
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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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+ .streams = _streams, \
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+ .flags = \
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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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+ } \
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+}
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+
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+/*
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+ * To enable sufficiently targeted rate sampling, MCS rates are divided into
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+ * groups, based on the number of streams and flags (HT40, SGI) that they
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+ * use.
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+ */
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+const struct mcs_group minstrel_mcs_groups[] = {
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+ MCS_GROUP(1, 0, 0),
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+ MCS_GROUP(2, 0, 0),
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+#if MINSTREL_MAX_STREAMS >= 3
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+ MCS_GROUP(3, 0, 0),
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+#endif
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+
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+ MCS_GROUP(1, 1, 0),
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+ MCS_GROUP(2, 1, 0),
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+#if MINSTREL_MAX_STREAMS >= 3
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+ MCS_GROUP(3, 1, 0),
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+#endif
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+
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+ MCS_GROUP(1, 0, 1),
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+ MCS_GROUP(2, 0, 1),
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+#if MINSTREL_MAX_STREAMS >= 3
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+ MCS_GROUP(3, 0, 1),
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+#endif
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+
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+ MCS_GROUP(1, 1, 1),
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+ MCS_GROUP(2, 1, 1),
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+#if MINSTREL_MAX_STREAMS >= 3
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+ MCS_GROUP(3, 1, 1),
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+#endif
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+};
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+
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+static u8 sample_table[SAMPLE_COLUMNS][MCS_GROUP_RATES];
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+
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+/*
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+ * Perform EWMA (Exponentially Weighted Moving Average) calculation
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+ */
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+static int
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+minstrel_ewma(int old, int new, int weight)
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+{
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+ return (new * (100 - weight) + old * weight) / 100;
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+}
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+
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+/*
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+ * Look up an MCS group index based on mac80211 rate information
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+ */
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+static int
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+minstrel_ht_get_group_idx(struct ieee80211_tx_rate *rate)
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+{
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+ int streams = (rate->idx / MCS_GROUP_RATES) + 1;
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+ u32 flags = IEEE80211_TX_RC_SHORT_GI | IEEE80211_TX_RC_40_MHZ_WIDTH;
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+ int i;
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+
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+ for (i = 0; i < ARRAY_SIZE(minstrel_mcs_groups); i++) {
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+ if (minstrel_mcs_groups[i].streams != streams)
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+ continue;
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+ if (minstrel_mcs_groups[i].flags != (rate->flags & flags))
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+ continue;
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+
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+ return i;
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+ }
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+
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+ WARN_ON(1);
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+ return 0;
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+}
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+
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+static inline struct minstrel_rate_stats *
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+minstrel_get_ratestats(struct minstrel_ht_sta *mi, int index)
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+{
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+ return &mi->groups[index / MCS_GROUP_RATES].rates[index % MCS_GROUP_RATES];
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+}
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+
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+
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+/*
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+ * Recalculate success probabilities and counters for a rate using EWMA
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+ */
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+static void
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+minstrel_calc_rate_ewma(struct minstrel_priv *mp, struct minstrel_rate_stats *mr)
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+{
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+ if (unlikely(mr->attempts > 0)) {
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+ mr->sample_skipped = 0;
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+ mr->cur_prob = MINSTREL_FRAC(mr->success, mr->attempts);
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+ if (!mr->att_hist)
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+ mr->probability = mr->cur_prob;
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+ else
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+ mr->probability = minstrel_ewma(mr->probability,
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+ mr->cur_prob, EWMA_LEVEL);
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+ mr->att_hist += mr->attempts;
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+ mr->succ_hist += mr->success;
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+ } else {
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+ mr->sample_skipped++;
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+ }
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+ mr->last_success = mr->success;
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+ mr->last_attempts = mr->attempts;
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+ mr->success = 0;
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+ mr->attempts = 0;
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+}
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+
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+/*
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+ * Calculate throughput based on the average A-MPDU length, taking into account
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+ * the expected number of retransmissions and their expected length
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+ */
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+static void
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+minstrel_ht_calc_tp(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
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+ int group, int rate)
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+{
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+ struct minstrel_rate_stats *mr;
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+ unsigned int usecs;
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+
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+ mr = &mi->groups[group].rates[rate];
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+
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+ if (mr->probability < MINSTREL_FRAC(1, 10)) {
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+ mr->cur_tp = 0;
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+ return;
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+ }
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+
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+ usecs = mi->overhead / MINSTREL_TRUNC(mi->avg_ampdu_len);
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+ usecs += minstrel_mcs_groups[group].duration[rate];
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+ mr->cur_tp = MINSTREL_TRUNC((1000000 / usecs) * mr->probability);
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+}
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+
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+/*
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+ * Update rate statistics and select new primary rates
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+ *
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+ * Rules for rate selection:
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+ * - max_prob_rate must use only one stream, as a tradeoff between delivery
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+ * probability and throughput during strong fluctuations
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+ * - as long as the max prob rate has a probability of more than 3/4, pick
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+ * higher throughput rates, even if the probablity is a bit lower
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+ */
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+static void
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+minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
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+{
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+ struct minstrel_mcs_group_data *mg;
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+ struct minstrel_rate_stats *mr;
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+ int cur_prob, cur_prob_tp, cur_tp, cur_tp2;
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+ int group, i, index;
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+
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+ if (mi->ampdu_packets > 0) {
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+ mi->avg_ampdu_len = minstrel_ewma(mi->avg_ampdu_len,
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+ MINSTREL_FRAC(mi->ampdu_len, mi->ampdu_packets), EWMA_LEVEL);
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+ mi->ampdu_len = 0;
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+ mi->ampdu_packets = 0;
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+ }
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+
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+ mi->sample_slow = 0;
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+ mi->sample_count = 0;
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+ mi->max_tp_rate = 0;
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+ mi->max_tp_rate2 = 0;
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+ mi->max_prob_rate = 0;
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+
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+ for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) {
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+ cur_prob = 0;
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+ cur_prob_tp = 0;
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+ cur_tp = 0;
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+ cur_tp2 = 0;
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+
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+ mg = &mi->groups[group];
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+ if (!mg->supported)
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+ continue;
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+
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+ mg->max_tp_rate = 0;
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+ mg->max_tp_rate2 = 0;
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+ mg->max_prob_rate = 0;
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+ mi->sample_count++;
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+
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+ for (i = 0; i < MCS_GROUP_RATES; i++) {
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+ if (!(mg->supported & BIT(i)))
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+ continue;
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+
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+ mr = &mg->rates[i];
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+ mr->retry_updated = false;
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+ index = MCS_GROUP_RATES * group + i;
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+ minstrel_calc_rate_ewma(mp, mr);
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+ minstrel_ht_calc_tp(mp, mi, group, i);
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+
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+ if (!mr->cur_tp)
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+ continue;
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+
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+ /* ignore the lowest rate of each single-stream group */
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+ if (!i && minstrel_mcs_groups[group].streams == 1)
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+ continue;
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+
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+ if ((mr->cur_tp > cur_prob_tp && mr->probability >
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+ MINSTREL_FRAC(3, 4)) || mr->probability > cur_prob) {
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+ mg->max_prob_rate = index;
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+ cur_prob = mr->probability;
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+ }
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+
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+ if (mr->cur_tp > cur_tp) {
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+ swap(index, mg->max_tp_rate);
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+ cur_tp = mr->cur_tp;
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+ mr = minstrel_get_ratestats(mi, index);
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+ }
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+
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+ if (index >= mg->max_tp_rate)
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+ continue;
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+
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+ if (mr->cur_tp > cur_tp2) {
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+ mg->max_tp_rate2 = index;
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+ cur_tp2 = mr->cur_tp;
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+ }
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+ }
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+ }
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+
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+ /* try to sample up to half of the availble rates during each interval */
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+ mi->sample_count *= 4;
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+
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+ cur_prob = 0;
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+ cur_prob_tp = 0;
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+ cur_tp = 0;
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+ cur_tp2 = 0;
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+ for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) {
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+ mg = &mi->groups[group];
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+ if (!mg->supported)
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+ continue;
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+
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+ mr = minstrel_get_ratestats(mi, mg->max_prob_rate);
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+ if (cur_prob_tp < mr->cur_tp &&
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+ minstrel_mcs_groups[group].streams == 1) {
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+ mi->max_prob_rate = mg->max_prob_rate;
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+ cur_prob = mr->cur_prob;
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+ }
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+
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+ mr = minstrel_get_ratestats(mi, mg->max_tp_rate);
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+ if (cur_tp < mr->cur_tp) {
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+ mi->max_tp_rate = mg->max_tp_rate;
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+ cur_tp = mr->cur_tp;
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+ }
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+
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+ mr = minstrel_get_ratestats(mi, mg->max_tp_rate2);
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+ if (cur_tp2 < mr->cur_tp) {
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+ mi->max_tp_rate2 = mg->max_tp_rate2;
|
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+ cur_tp2 = mr->cur_tp;
|
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+ }
|
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+ }
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+
|
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+ mi->stats_update = jiffies;
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+}
|
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+
|
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+static bool
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+minstrel_ht_txstat_valid(struct ieee80211_tx_rate *rate)
|
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+{
|
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+ if (!rate->count)
|
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+ return false;
|
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+
|
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+ if (rate->idx < 0)
|
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+ return false;
|
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+
|
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+ return !!(rate->flags & IEEE80211_TX_RC_MCS);
|
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+}
|
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+
|
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+static void
|
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+minstrel_next_sample_idx(struct minstrel_ht_sta *mi)
|
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+{
|
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+ struct minstrel_mcs_group_data *mg;
|
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+
|
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+ for (;;) {
|
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+ mi->sample_group++;
|
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+ mi->sample_group %= ARRAY_SIZE(minstrel_mcs_groups);
|
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+ mg = &mi->groups[mi->sample_group];
|
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+
|
|
+ if (!mg->supported)
|
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+ continue;
|
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+
|
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+ if (++mg->index > MCS_GROUP_RATES) {
|
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+ mg->index = 0;
|
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+ if (++mg->column > ARRAY_SIZE(sample_table))
|
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+ mg->column = 0;
|
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+ }
|
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+ break;
|
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+ }
|
|
+}
|
|
+
|
|
+static void
|
|
+minstrel_downgrade_rate(struct minstrel_ht_sta *mi, int *idx, bool primary)
|
|
+{
|
|
+ int group, orig_group;
|
|
+
|
|
+ orig_group = group = *idx / MCS_GROUP_RATES;
|
|
+ while (group > 0) {
|
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+ group--;
|
|
+
|
|
+ if (!mi->groups[group].supported)
|
|
+ continue;
|
|
+
|
|
+ if (minstrel_mcs_groups[group].streams >
|
|
+ minstrel_mcs_groups[orig_group].streams)
|
|
+ continue;
|
|
+
|
|
+ if (primary)
|
|
+ *idx = mi->groups[group].max_tp_rate;
|
|
+ else
|
|
+ *idx = mi->groups[group].max_tp_rate2;
|
|
+ break;
|
|
+ }
|
|
+}
|
|
+
|
|
+static void
|
|
+minstrel_aggr_check(struct minstrel_priv *mp, struct ieee80211_sta *pubsta, struct sk_buff *skb)
|
|
+{
|
|
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
|
|
+ struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
|
|
+ u16 tid;
|
|
+
|
|
+ if (unlikely(!ieee80211_is_data_qos(hdr->frame_control)))
|
|
+ return;
|
|
+
|
|
+ if (unlikely(skb->protocol == cpu_to_be16(ETH_P_PAE)))
|
|
+ return;
|
|
+
|
|
+ tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
|
|
+ if (likely(sta->ampdu_mlme.tid_state_tx[tid] != HT_AGG_STATE_IDLE))
|
|
+ return;
|
|
+
|
|
+ ieee80211_start_tx_ba_session(pubsta, tid);
|
|
+}
|
|
+
|
|
+static void
|
|
+minstrel_ht_tx_status(void *priv, struct ieee80211_supported_band *sband,
|
|
+ struct ieee80211_sta *sta, void *priv_sta,
|
|
+ struct sk_buff *skb)
|
|
+{
|
|
+ struct minstrel_ht_sta_priv *msp = priv_sta;
|
|
+ struct minstrel_ht_sta *mi = &msp->ht;
|
|
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
|
|
+ struct ieee80211_tx_rate *ar = info->status.rates;
|
|
+ struct minstrel_rate_stats *rate, *rate2;
|
|
+ struct minstrel_priv *mp = priv;
|
|
+ bool last = false;
|
|
+ int group;
|
|
+ int i = 0;
|
|
+
|
|
+ if (!msp->is_ht)
|
|
+ return mac80211_minstrel.tx_status(priv, sband, sta, &msp->legacy, skb);
|
|
+
|
|
+ /* This packet was aggregated but doesn't carry status info */
|
|
+ if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
|
|
+ !(info->flags & IEEE80211_TX_STAT_AMPDU))
|
|
+ return;
|
|
+
|
|
+ if (!info->status.ampdu_len) {
|
|
+ info->status.ampdu_ack_len = 1;
|
|
+ info->status.ampdu_len = 1;
|
|
+ }
|
|
+
|
|
+ mi->ampdu_packets++;
|
|
+ mi->ampdu_len += info->status.ampdu_len;
|
|
+
|
|
+ if (!mi->sample_wait && !mi->sample_tries && mi->sample_count > 0) {
|
|
+ mi->sample_wait = 4 + MINSTREL_TRUNC(mi->avg_ampdu_len);
|
|
+ mi->sample_tries = 3;
|
|
+ mi->sample_count--;
|
|
+ }
|
|
+
|
|
+ if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) {
|
|
+ mi->sample_packets += info->status.ampdu_len;
|
|
+ minstrel_next_sample_idx(mi);
|
|
+ }
|
|
+
|
|
+ for (i = 0; !last; i++) {
|
|
+ last = (i == IEEE80211_TX_MAX_RATES - 1) ||
|
|
+ !minstrel_ht_txstat_valid(&ar[i + 1]);
|
|
+
|
|
+ if (!minstrel_ht_txstat_valid(&ar[i]))
|
|
+ break;
|
|
+
|
|
+ group = minstrel_ht_get_group_idx(&ar[i]);
|
|
+ rate = &mi->groups[group].rates[ar[i].idx % 8];
|
|
+
|
|
+ if (last && (info->flags & IEEE80211_TX_STAT_ACK))
|
|
+ rate->success += info->status.ampdu_ack_len;
|
|
+
|
|
+ rate->attempts += ar[i].count * info->status.ampdu_len;
|
|
+ }
|
|
+
|
|
+ /*
|
|
+ * check for sudden death of spatial multiplexing,
|
|
+ * downgrade to a lower number of streams if necessary.
|
|
+ */
|
|
+ rate = minstrel_get_ratestats(mi, mi->max_tp_rate);
|
|
+ if (rate->attempts > 30 &&
|
|
+ MINSTREL_FRAC(rate->success, rate->attempts) <
|
|
+ MINSTREL_FRAC(20, 100))
|
|
+ minstrel_downgrade_rate(mi, &mi->max_tp_rate, true);
|
|
+
|
|
+ rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate2);
|
|
+ if (rate->attempts > 30 &&
|
|
+ MINSTREL_FRAC(rate->success, rate->attempts) <
|
|
+ MINSTREL_FRAC(20, 100))
|
|
+ minstrel_downgrade_rate(mi, &mi->max_tp_rate2, false);
|
|
+
|
|
+ if (time_after(jiffies, mi->stats_update + (mp->update_interval / 2 * HZ) / 1000)) {
|
|
+ minstrel_ht_update_stats(mp, mi);
|
|
+ minstrel_aggr_check(mp, sta, skb);
|
|
+ }
|
|
+}
|
|
+
|
|
+static void
|
|
+minstrel_calc_retransmit(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
|
|
+ int index)
|
|
+{
|
|
+ struct minstrel_rate_stats *mr;
|
|
+ const struct mcs_group *group;
|
|
+ unsigned int tx_time, tx_time_rtscts, tx_time_data;
|
|
+ unsigned int cw = mp->cw_min;
|
|
+ unsigned int t_slot = 9; /* FIXME */
|
|
+ unsigned int ampdu_len = MINSTREL_TRUNC(mi->avg_ampdu_len);
|
|
+
|
|
+ mr = minstrel_get_ratestats(mi, index);
|
|
+ if (mr->probability < MINSTREL_FRAC(1, 10)) {
|
|
+ mr->retry_count = 1;
|
|
+ mr->retry_count_rtscts = 1;
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ mr->retry_count = 2;
|
|
+ mr->retry_count_rtscts = 2;
|
|
+ mr->retry_updated = true;
|
|
+
|
|
+ group = &minstrel_mcs_groups[index / MCS_GROUP_RATES];
|
|
+ tx_time_data = group->duration[index % MCS_GROUP_RATES] * ampdu_len;
|
|
+ tx_time = 2 * (t_slot + mi->overhead + tx_time_data);
|
|
+ tx_time_rtscts = 2 * (t_slot + mi->overhead_rtscts + tx_time_data);
|
|
+ do {
|
|
+ cw = (cw << 1) | 1;
|
|
+ cw = min(cw, mp->cw_max);
|
|
+ tx_time += cw + t_slot + mi->overhead;
|
|
+ tx_time_rtscts += cw + t_slot + mi->overhead_rtscts;
|
|
+ if (tx_time_rtscts < mp->segment_size)
|
|
+ mr->retry_count_rtscts++;
|
|
+ } while ((tx_time < mp->segment_size) &&
|
|
+ (++mr->retry_count < mp->max_retry));
|
|
+}
|
|
+
|
|
+
|
|
+static void
|
|
+minstrel_ht_set_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
|
|
+ struct ieee80211_tx_rate *rate, int index,
|
|
+ struct ieee80211_tx_rate_control *txrc,
|
|
+ bool sample, bool rtscts)
|
|
+{
|
|
+ const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES];
|
|
+ struct minstrel_rate_stats *mr;
|
|
+
|
|
+ mr = minstrel_get_ratestats(mi, index);
|
|
+ if (!mr->retry_updated)
|
|
+ minstrel_calc_retransmit(mp, mi, index);
|
|
+
|
|
+ if (mr->probability < MINSTREL_FRAC(20, 100))
|
|
+ rate->count = 2;
|
|
+ else if (rtscts)
|
|
+ rate->count = mr->retry_count_rtscts;
|
|
+ else
|
|
+ rate->count = mr->retry_count;
|
|
+
|
|
+ rate->flags = IEEE80211_TX_RC_MCS | group->flags;
|
|
+ if (txrc->short_preamble)
|
|
+ rate->flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
|
|
+ if (txrc->rts || rtscts)
|
|
+ rate->flags |= IEEE80211_TX_RC_USE_RTS_CTS;
|
|
+ rate->idx = index % MCS_GROUP_RATES + (group->streams - 1) * MCS_GROUP_RATES;
|
|
+}
|
|
+
|
|
+static inline int
|
|
+minstrel_get_duration(int index)
|
|
+{
|
|
+ const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES];
|
|
+ return group->duration[index % MCS_GROUP_RATES];
|
|
+}
|
|
+
|
|
+static int
|
|
+minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
|
|
+{
|
|
+ struct minstrel_rate_stats *mr;
|
|
+ struct minstrel_mcs_group_data *mg;
|
|
+ int sample_idx = 0;
|
|
+
|
|
+ if (mi->sample_wait > 0) {
|
|
+ mi->sample_wait--;
|
|
+ return -1;
|
|
+ }
|
|
+
|
|
+ if (!mi->sample_tries)
|
|
+ return -1;
|
|
+
|
|
+ mi->sample_tries--;
|
|
+ mg = &mi->groups[mi->sample_group];
|
|
+ sample_idx = sample_table[mg->column][mg->index];
|
|
+ mr = &mg->rates[sample_idx];
|
|
+ sample_idx += mi->sample_group * MCS_GROUP_RATES;
|
|
+
|
|
+ /*
|
|
+ * When not using MRR, do not sample if the probability is already
|
|
+ * higher than 95% to avoid wasting airtime
|
|
+ */
|
|
+ if (!mp->has_mrr && (mr->probability > MINSTREL_FRAC(95, 100)))
|
|
+ goto next;
|
|
+
|
|
+ /*
|
|
+ * Make sure that lower rates get sampled only occasionally,
|
|
+ * if the link is working perfectly.
|
|
+ */
|
|
+ if (minstrel_get_duration(sample_idx) >
|
|
+ minstrel_get_duration(mi->max_tp_rate)) {
|
|
+ if (mr->sample_skipped < 10)
|
|
+ goto next;
|
|
+
|
|
+ if (mi->sample_slow++ > 2)
|
|
+ goto next;
|
|
+ }
|
|
+
|
|
+ return sample_idx;
|
|
+
|
|
+next:
|
|
+ minstrel_next_sample_idx(mi);
|
|
+ return -1;
|
|
+}
|
|
+
|
|
+static void
|
|
+minstrel_ht_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta,
|
|
+ struct ieee80211_tx_rate_control *txrc)
|
|
+{
|
|
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
|
|
+ struct ieee80211_tx_rate *ar = info->status.rates;
|
|
+ struct minstrel_ht_sta_priv *msp = priv_sta;
|
|
+ struct minstrel_ht_sta *mi = &msp->ht;
|
|
+ struct minstrel_priv *mp = priv;
|
|
+ int sample_idx;
|
|
+
|
|
+ if (rate_control_send_low(sta, priv_sta, txrc))
|
|
+ return;
|
|
+
|
|
+ if (!msp->is_ht)
|
|
+ return mac80211_minstrel.get_rate(priv, sta, &msp->legacy, txrc);
|
|
+
|
|
+ sample_idx = minstrel_get_sample_rate(mp, mi);
|
|
+ if (sample_idx >= 0) {
|
|
+ minstrel_ht_set_rate(mp, mi, &ar[0], sample_idx,
|
|
+ txrc, true, false);
|
|
+ minstrel_ht_set_rate(mp, mi, &ar[1], mi->max_tp_rate,
|
|
+ txrc, false, true);
|
|
+ info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
|
|
+ } else {
|
|
+ minstrel_ht_set_rate(mp, mi, &ar[0], mi->max_tp_rate,
|
|
+ txrc, false, false);
|
|
+ minstrel_ht_set_rate(mp, mi, &ar[1], mi->max_tp_rate2,
|
|
+ txrc, false, true);
|
|
+ }
|
|
+ minstrel_ht_set_rate(mp, mi, &ar[2], mi->max_prob_rate, txrc, false, true);
|
|
+
|
|
+ ar[3].count = 0;
|
|
+ ar[3].idx = -1;
|
|
+
|
|
+ mi->total_packets++;
|
|
+
|
|
+ /* wraparound */
|
|
+ if (mi->total_packets == ~0) {
|
|
+ mi->total_packets = 0;
|
|
+ mi->sample_packets = 0;
|
|
+ }
|
|
+}
|
|
+
|
|
+static void
|
|
+minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband,
|
|
+ struct ieee80211_sta *sta, void *priv_sta,
|
|
+ enum nl80211_channel_type oper_chan_type)
|
|
+{
|
|
+ struct minstrel_priv *mp = priv;
|
|
+ struct minstrel_ht_sta_priv *msp = priv_sta;
|
|
+ struct minstrel_ht_sta *mi = &msp->ht;
|
|
+ struct ieee80211_mcs_info *mcs = &sta->ht_cap.mcs;
|
|
+ struct ieee80211_local *local = hw_to_local(mp->hw);
|
|
+ u16 sta_cap = sta->ht_cap.cap;
|
|
+ int ack_dur;
|
|
+ int i;
|
|
+
|
|
+ /* fall back to the old minstrel for legacy stations */
|
|
+ if (sta && !sta->ht_cap.ht_supported) {
|
|
+ msp->is_ht = false;
|
|
+ memset(&msp->legacy, 0, sizeof(msp->legacy));
|
|
+ msp->legacy.r = msp->ratelist;
|
|
+ msp->legacy.sample_table = msp->sample_table;
|
|
+ return mac80211_minstrel.rate_init(priv, sband, sta, &msp->legacy);
|
|
+ }
|
|
+
|
|
+ BUILD_BUG_ON(ARRAY_SIZE(minstrel_mcs_groups) !=
|
|
+ MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS);
|
|
+
|
|
+ msp->is_ht = true;
|
|
+ memset(mi, 0, sizeof(*mi));
|
|
+ mi->stats_update = jiffies;
|
|
+
|
|
+ ack_dur = ieee80211_frame_duration(local, 10, 60, 1, 1);
|
|
+ mi->overhead = ieee80211_frame_duration(local, 0, 60, 1, 1) + ack_dur;
|
|
+ mi->overhead_rtscts = mi->overhead + 2 * ack_dur;
|
|
+
|
|
+ mi->avg_ampdu_len = MINSTREL_FRAC(1, 1);
|
|
+
|
|
+ /* When using MRR, sample more on the first attempt, without delay */
|
|
+ if (mp->has_mrr) {
|
|
+ mi->sample_count = 16;
|
|
+ mi->sample_wait = 0;
|
|
+ } else {
|
|
+ mi->sample_count = 8;
|
|
+ mi->sample_wait = 8;
|
|
+ }
|
|
+ mi->sample_tries = 4;
|
|
+
|
|
+ if (oper_chan_type != NL80211_CHAN_HT40MINUS &&
|
|
+ oper_chan_type != NL80211_CHAN_HT40PLUS)
|
|
+ sta_cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
|
|
+
|
|
+ for (i = 0; i < ARRAY_SIZE(mi->groups); i++) {
|
|
+ u16 req = 0;
|
|
+
|
|
+ mi->groups[i].supported = 0;
|
|
+ if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_SHORT_GI) {
|
|
+ if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
|
|
+ req |= IEEE80211_HT_CAP_SGI_40;
|
|
+ else
|
|
+ req |= IEEE80211_HT_CAP_SGI_20;
|
|
+ }
|
|
+
|
|
+ if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
|
|
+ req |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
|
|
+
|
|
+ if ((sta_cap & req) != req)
|
|
+ continue;
|
|
+
|
|
+ mi->groups[i].supported =
|
|
+ mcs->rx_mask[minstrel_mcs_groups[i].streams - 1];
|
|
+ }
|
|
+}
|
|
+
|
|
+static void
|
|
+minstrel_ht_rate_init(void *priv, struct ieee80211_supported_band *sband,
|
|
+ struct ieee80211_sta *sta, void *priv_sta)
|
|
+{
|
|
+ struct minstrel_priv *mp = priv;
|
|
+
|
|
+ minstrel_ht_update_caps(priv, sband, sta, priv_sta, mp->hw->conf.channel_type);
|
|
+}
|
|
+
|
|
+static void
|
|
+minstrel_ht_rate_update(void *priv, struct ieee80211_supported_band *sband,
|
|
+ struct ieee80211_sta *sta, void *priv_sta,
|
|
+ u32 changed, enum nl80211_channel_type oper_chan_type)
|
|
+{
|
|
+ minstrel_ht_update_caps(priv, sband, sta, priv_sta, oper_chan_type);
|
|
+}
|
|
+
|
|
+static void *
|
|
+minstrel_ht_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp)
|
|
+{
|
|
+ struct ieee80211_supported_band *sband;
|
|
+ struct minstrel_ht_sta_priv *msp;
|
|
+ struct minstrel_priv *mp = priv;
|
|
+ struct ieee80211_hw *hw = mp->hw;
|
|
+ int max_rates = 0;
|
|
+ int i;
|
|
+
|
|
+ for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
|
|
+ sband = hw->wiphy->bands[i];
|
|
+ if (sband && sband->n_bitrates > max_rates)
|
|
+ max_rates = sband->n_bitrates;
|
|
+ }
|
|
+
|
|
+ msp = kzalloc(sizeof(struct minstrel_ht_sta), gfp);
|
|
+ if (!msp)
|
|
+ return NULL;
|
|
+
|
|
+ msp->ratelist = kzalloc(sizeof(struct minstrel_rate) * max_rates, gfp);
|
|
+ if (!msp->ratelist)
|
|
+ goto error;
|
|
+
|
|
+ msp->sample_table = kmalloc(SAMPLE_COLUMNS * max_rates, gfp);
|
|
+ if (!msp->sample_table)
|
|
+ goto error1;
|
|
+
|
|
+ return msp;
|
|
+
|
|
+error1:
|
|
+ kfree(msp->sample_table);
|
|
+error:
|
|
+ kfree(msp);
|
|
+ return NULL;
|
|
+}
|
|
+
|
|
+static void
|
|
+minstrel_ht_free_sta(void *priv, struct ieee80211_sta *sta, void *priv_sta)
|
|
+{
|
|
+ struct minstrel_ht_sta_priv *msp = priv_sta;
|
|
+
|
|
+ kfree(msp->sample_table);
|
|
+ kfree(msp->ratelist);
|
|
+ kfree(msp);
|
|
+}
|
|
+
|
|
+static void *
|
|
+minstrel_ht_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
|
|
+{
|
|
+ return mac80211_minstrel.alloc(hw, debugfsdir);
|
|
+}
|
|
+
|
|
+static void
|
|
+minstrel_ht_free(void *priv)
|
|
+{
|
|
+ mac80211_minstrel.free(priv);
|
|
+}
|
|
+
|
|
+static struct rate_control_ops mac80211_minstrel_ht = {
|
|
+ .name = "minstrel_ht",
|
|
+ .tx_status = minstrel_ht_tx_status,
|
|
+ .get_rate = minstrel_ht_get_rate,
|
|
+ .rate_init = minstrel_ht_rate_init,
|
|
+ .rate_update = minstrel_ht_rate_update,
|
|
+ .alloc_sta = minstrel_ht_alloc_sta,
|
|
+ .free_sta = minstrel_ht_free_sta,
|
|
+ .alloc = minstrel_ht_alloc,
|
|
+ .free = minstrel_ht_free,
|
|
+#ifdef CONFIG_MAC80211_DEBUGFS
|
|
+ .add_sta_debugfs = minstrel_ht_add_sta_debugfs,
|
|
+ .remove_sta_debugfs = minstrel_ht_remove_sta_debugfs,
|
|
+#endif
|
|
+};
|
|
+
|
|
+
|
|
+static void
|
|
+init_sample_table(void)
|
|
+{
|
|
+ int col, i, new_idx;
|
|
+ u8 rnd[MCS_GROUP_RATES];
|
|
+
|
|
+ memset(sample_table, 0xff, sizeof(sample_table));
|
|
+ for (col = 0; col < SAMPLE_COLUMNS; col++) {
|
|
+ for (i = 0; i < MCS_GROUP_RATES; i++) {
|
|
+ get_random_bytes(rnd, sizeof(rnd));
|
|
+ new_idx = (i + rnd[i]) % MCS_GROUP_RATES;
|
|
+
|
|
+ while (sample_table[col][new_idx] != 0xff)
|
|
+ new_idx = (new_idx + 1) % MCS_GROUP_RATES;
|
|
+
|
|
+ sample_table[col][new_idx] = i;
|
|
+ }
|
|
+ }
|
|
+}
|
|
+
|
|
+int __init
|
|
+rc80211_minstrel_ht_init(void)
|
|
+{
|
|
+ init_sample_table();
|
|
+ return ieee80211_rate_control_register(&mac80211_minstrel_ht);
|
|
+}
|
|
+
|
|
+void
|
|
+rc80211_minstrel_ht_exit(void)
|
|
+{
|
|
+ ieee80211_rate_control_unregister(&mac80211_minstrel_ht);
|
|
+}
|
|
--- /dev/null
|
|
+++ b/net/mac80211/rc80211_minstrel_ht.h
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@@ -0,0 +1,125 @@
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+/*
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+ * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ */
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+
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+#ifndef __RC_MINSTREL_HT_H
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+#define __RC_MINSTREL_HT_H
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+
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+/*
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+ * maximum number of spatial streams to make use of
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+ * set this value to 3 once we have drivers that support it
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+ */
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+#define MINSTREL_MAX_STREAMS 2
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+#define MINSTREL_STREAM_GROUPS 4
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+
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+/* scaled fraction values */
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+#define MINSTREL_SCALE 16
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+#define MINSTREL_FRAC(val, div) (((val) << MINSTREL_SCALE) / div)
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+#define MINSTREL_TRUNC(val) ((val) >> MINSTREL_SCALE)
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+
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+#define MCS_GROUP_RATES 8
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+
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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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+};
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+
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+struct minstrel_rate_stats {
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+ /* current / last sampling period attempts/success counters */
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+ unsigned int attempts, last_attempts;
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+ unsigned int success, last_success;
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+
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+ /* total attempts/success counters */
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+ u64 att_hist, succ_hist;
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+
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+ /* current throughput */
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+ unsigned int cur_tp;
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+
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+ /* packet delivery probabilities */
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+ unsigned int cur_prob, probability;
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+
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+ /* maximum retry counts */
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+ unsigned int retry_count;
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+ unsigned int retry_count_rtscts;
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+
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+ bool retry_updated;
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+ u8 sample_skipped;
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+};
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+
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+struct minstrel_mcs_group_data {
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+ u8 index;
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+ u8 column;
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+
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+ /* bitfield of supported MCS rates of this group */
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+ u8 supported;
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+
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+ /* selected primary rates */
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+ unsigned int max_tp_rate;
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+ unsigned int max_tp_rate2;
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+ unsigned int max_prob_rate;
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+
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+ /* MCS rate statistics */
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+ struct minstrel_rate_stats rates[MCS_GROUP_RATES];
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+};
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+
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+struct minstrel_ht_sta {
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+ /* ampdu length (average, per sampling interval) */
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+ unsigned int ampdu_len;
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+ unsigned int ampdu_packets;
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+
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+ /* ampdu length (EWMA) */
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+ unsigned int avg_ampdu_len;
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+
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+ /* best throughput rate */
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+ unsigned int max_tp_rate;
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+
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+ /* second best throughput rate */
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+ unsigned int max_tp_rate2;
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+
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+ /* best probability rate */
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+ unsigned int max_prob_rate;
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+
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+ /* time of last status update */
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+ unsigned long stats_update;
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+
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+ /* overhead time in usec for each frame */
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+ unsigned int overhead;
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+ unsigned int overhead_rtscts;
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+
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+ unsigned int total_packets;
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+ unsigned int sample_packets;
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+
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+ u8 sample_wait;
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+ u8 sample_tries;
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+ u8 sample_count;
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+ u8 sample_slow;
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+
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+ /* current MCS group to be sampled */
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+ u8 sample_group;
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+
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+ /* MCS rate group info and statistics */
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+ struct minstrel_mcs_group_data groups[MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS];
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+};
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+
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+struct minstrel_ht_sta_priv {
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+ union {
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+ struct minstrel_ht_sta ht;
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+ struct minstrel_sta_info legacy;
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+ };
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+#ifdef CONFIG_MAC80211_DEBUGFS
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+ struct dentry *dbg_stats;
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+#endif
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+ void *ratelist;
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+ void *sample_table;
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+ bool is_ht;
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+};
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+
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+void minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir);
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+void minstrel_ht_remove_sta_debugfs(void *priv, void *priv_sta);
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+
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+#endif
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--- /dev/null
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+++ b/net/mac80211/rc80211_minstrel_ht_debugfs.c
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@@ -0,0 +1,120 @@
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+/*
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+ * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ */
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+#include <linux/netdevice.h>
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+#include <linux/types.h>
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+#include <linux/skbuff.h>
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+#include <linux/debugfs.h>
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+#include <linux/ieee80211.h>
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+#include <net/mac80211.h>
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+#include "rc80211_minstrel.h"
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+#include "rc80211_minstrel_ht.h"
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+
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+extern const struct mcs_group minstrel_mcs_groups[];
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+
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+static int
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+minstrel_ht_stats_open(struct inode *inode, struct file *file)
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+{
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+ struct minstrel_ht_sta_priv *msp = inode->i_private;
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+ struct minstrel_ht_sta *mi = &msp->ht;
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+ struct minstrel_debugfs_info *ms;
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+ unsigned int i, j, tp, prob, eprob;
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+ char *p;
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+ int ret;
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+
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+ if (!msp->is_ht) {
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+ inode->i_private = &msp->legacy;
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+ ret = minstrel_stats_open(inode, file);
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+ inode->i_private = msp;
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+ return ret;
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+ }
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+
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+ ms = kmalloc(sizeof(*ms) + 8192, GFP_KERNEL);
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+ if (!ms)
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+ return -ENOMEM;
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+
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+ file->private_data = ms;
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+ p = ms->buf;
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+ p += sprintf(p, "type rate throughput ewma prob this prob "
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+ "this succ/attempt success attempts\n");
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+ for (i = 0; i < MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS; i++) {
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+ char htmode = '2';
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+ char gimode = 'L';
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+
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+ if (!mi->groups[i].supported)
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+ continue;
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+
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+ if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
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+ htmode = '4';
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+ if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_SHORT_GI)
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+ gimode = 'S';
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+
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+ for (j = 0; j < MCS_GROUP_RATES; j++) {
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+ struct minstrel_rate_stats *mr = &mi->groups[i].rates[j];
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+ int idx = i * MCS_GROUP_RATES + j;
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+
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+ if (!(mi->groups[i].supported & BIT(j)))
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+ continue;
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+
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+ p += sprintf(p, "HT%c0/%cGI ", htmode, gimode);
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+
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+ *(p++) = (idx == mi->max_tp_rate) ? 'T' : ' ';
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+ *(p++) = (idx == mi->max_tp_rate2) ? 't' : ' ';
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+ *(p++) = (idx == mi->max_prob_rate) ? 'P' : ' ';
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+ p += sprintf(p, "MCS%-2u", (minstrel_mcs_groups[i].streams - 1) *
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+ MCS_GROUP_RATES + j);
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+
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+ tp = mr->cur_tp / 10;
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+ prob = MINSTREL_TRUNC(mr->cur_prob * 1000);
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+ eprob = MINSTREL_TRUNC(mr->probability * 1000);
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+
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+ p += sprintf(p, " %6u.%1u %6u.%1u %6u.%1u "
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+ "%3u(%3u) %8llu %8llu\n",
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+ tp / 10, tp % 10,
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+ eprob / 10, eprob % 10,
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+ prob / 10, prob % 10,
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+ mr->last_success,
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+ mr->last_attempts,
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+ (unsigned long long)mr->succ_hist,
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+ (unsigned long long)mr->att_hist);
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+ }
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+ }
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+ p += sprintf(p, "\nTotal packet count:: ideal %d "
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+ "lookaround %d\n",
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+ max(0, (int) mi->total_packets - (int) mi->sample_packets),
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+ mi->sample_packets);
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+ p += sprintf(p, "Average A-MPDU length: %d.%d\n",
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+ MINSTREL_TRUNC(mi->avg_ampdu_len),
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+ MINSTREL_TRUNC(mi->avg_ampdu_len * 10) % 10);
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+ ms->len = p - ms->buf;
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+
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+ return 0;
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+}
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+
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+static const struct file_operations minstrel_ht_stat_fops = {
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+ .owner = THIS_MODULE,
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+ .open = minstrel_ht_stats_open,
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+ .read = minstrel_stats_read,
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+ .release = minstrel_stats_release,
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+};
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+
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+void
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+minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
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+{
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+ struct minstrel_ht_sta_priv *msp = priv_sta;
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+
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+ msp->dbg_stats = debugfs_create_file("rc_stats", S_IRUGO, dir, msp,
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+ &minstrel_ht_stat_fops);
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+}
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+
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+void
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+minstrel_ht_remove_sta_debugfs(void *priv, void *priv_sta)
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+{
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+ struct minstrel_ht_sta_priv *msp = priv_sta;
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+
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+ debugfs_remove(msp->dbg_stats);
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+}
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