Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / mac80211 / rc80211_minstrel.h

diff --git a/kernel/net/mac80211/rc80211_minstrel.h b/kernel/net/mac80211/rc80211_minstrel.h
new file mode 100644 (file)
index 0000000..c230bbe
--- /dev/null
+++ b/kernel/net/mac80211/rc80211_minstrel.h
@@ -0,0 +1,170 @@
+/*
+ * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __RC_MINSTREL_H
+#define __RC_MINSTREL_H
+
+#define EWMA_LEVEL     96      /* ewma weighting factor [/EWMA_DIV] */
+#define EWMA_DIV       128
+#define SAMPLE_COLUMNS 10      /* number of columns in sample table */
+
+/* scaled fraction values */
+#define MINSTREL_SCALE  16
+#define MINSTREL_FRAC(val, div) (((val) << MINSTREL_SCALE) / div)
+#define MINSTREL_TRUNC(val) ((val) >> MINSTREL_SCALE)
+
+/* number of highest throughput rates to consider*/
+#define MAX_THR_RATES 4
+
+/*
+ * Perform EWMA (Exponentially Weighted Moving Average) calculation
+ */
+static inline int
+minstrel_ewma(int old, int new, int weight)
+{
+       int diff, incr;
+
+       diff = new - old;
+       incr = (EWMA_DIV - weight) * diff / EWMA_DIV;
+
+       return old + incr;
+}
+
+/*
+ * Perform EWMSD (Exponentially Weighted Moving Standard Deviation) calculation
+ */
+static inline int
+minstrel_ewmsd(int old_ewmsd, int cur_prob, int prob_ewma, int weight)
+{
+       int diff, incr, tmp_var;
+
+       /* calculate exponential weighted moving variance */
+       diff = MINSTREL_TRUNC((cur_prob - prob_ewma) * 1000000);
+       incr = (EWMA_DIV - weight) * diff / EWMA_DIV;
+       tmp_var = old_ewmsd * old_ewmsd;
+       tmp_var = weight * (tmp_var + diff * incr / 1000000) / EWMA_DIV;
+
+       /* return standard deviation */
+       return (u16) int_sqrt(tmp_var);
+}
+
+struct minstrel_rate_stats {
+       /* current / last sampling period attempts/success counters */
+       u16 attempts, last_attempts;
+       u16 success, last_success;
+
+       /* total attempts/success counters */
+       u64 att_hist, succ_hist;
+
+       /* statistis of packet delivery probability
+        *  cur_prob  - current prob within last update intervall
+        *  prob_ewma - exponential weighted moving average of prob
+        *  prob_ewmsd - exp. weighted moving standard deviation of prob */
+       unsigned int cur_prob;
+       unsigned int prob_ewma;
+       u16 prob_ewmsd;
+
+       /* maximum retry counts */
+       u8 retry_count;
+       u8 retry_count_rtscts;
+
+       u8 sample_skipped;
+       bool retry_updated;
+};
+
+struct minstrel_rate {
+       int bitrate;
+
+       s8 rix;
+       u8 retry_count_cts;
+       u8 adjusted_retry_count;
+
+       unsigned int perfect_tx_time;
+       unsigned int ack_time;
+
+       int sample_limit;
+
+       struct minstrel_rate_stats stats;
+};
+
+struct minstrel_sta_info {
+       struct ieee80211_sta *sta;
+
+       unsigned long last_stats_update;
+       unsigned int sp_ack_dur;
+       unsigned int rate_avg;
+
+       unsigned int lowest_rix;
+
+       u8 max_tp_rate[MAX_THR_RATES];
+       u8 max_prob_rate;
+       unsigned int total_packets;
+       unsigned int sample_packets;
+       int sample_deferred;
+
+       unsigned int sample_row;
+       unsigned int sample_column;
+
+       int n_rates;
+       struct minstrel_rate *r;
+       bool prev_sample;
+
+       /* sampling table */
+       u8 *sample_table;
+
+#ifdef CONFIG_MAC80211_DEBUGFS
+       struct dentry *dbg_stats;
+       struct dentry *dbg_stats_csv;
+#endif
+};
+
+struct minstrel_priv {
+       struct ieee80211_hw *hw;
+       bool has_mrr;
+       unsigned int cw_min;
+       unsigned int cw_max;
+       unsigned int max_retry;
+       unsigned int segment_size;
+       unsigned int update_interval;
+       unsigned int lookaround_rate;
+       unsigned int lookaround_rate_mrr;
+
+       u8 cck_rates[4];
+
+#ifdef CONFIG_MAC80211_DEBUGFS
+       /*
+        * enable fixed rate processing per RC
+        *   - write static index to debugfs:ieee80211/phyX/rc/fixed_rate_idx
+        *   - write -1 to enable RC processing again
+        *   - setting will be applied on next update
+        */
+       u32 fixed_rate_idx;
+       struct dentry *dbg_fixed_rate;
+#endif
+};
+
+struct minstrel_debugfs_info {
+       size_t len;
+       char buf[];
+};
+
+extern const struct rate_control_ops mac80211_minstrel;
+void minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir);
+void minstrel_remove_sta_debugfs(void *priv, void *priv_sta);
+
+/* Recalculate success probabilities and counters for a given rate using EWMA */
+void minstrel_calc_rate_stats(struct minstrel_rate_stats *mrs);
+int minstrel_get_tp_avg(struct minstrel_rate *mr, int prob_ewma);
+
+/* debugfs */
+int minstrel_stats_open(struct inode *inode, struct file *file);
+int minstrel_stats_csv_open(struct inode *inode, struct file *file);
+ssize_t minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos);
+int minstrel_stats_release(struct inode *inode, struct file *file);
+
+#endif