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![Johannes Berg](/assets/img/avatar_default.png)
These things aren't used and the only possible use is within rate control algorithms, however those can, if they need it, keep track of it in their private data. last_ack_ms isn't even updated so completely useless. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
547 lines
17 KiB
C
547 lines
17 KiB
C
/*
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* Copyright 2002-2005, Instant802 Networks, Inc.
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* Copyright 2005, Devicescape Software, Inc.
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* Copyright 2007, Mattias Nissler <mattias.nissler@gmx.de>
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* Copyright 2007-2008, Stefano Brivio <stefano.brivio@polimi.it>
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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 <net/mac80211.h>
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#include "ieee80211_rate.h"
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#include "rc80211_pid.h"
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/* This is an implementation of a TX rate control algorithm that uses a PID
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* controller. Given a target failed frames rate, the controller decides about
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* TX rate changes to meet the target failed frames rate.
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*
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* The controller basically computes the following:
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*
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* adj = CP * err + CI * err_avg + CD * (err - last_err) * (1 + sharpening)
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*
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* where
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* adj adjustment value that is used to switch TX rate (see below)
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* err current error: target vs. current failed frames percentage
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* last_err last error
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* err_avg average (i.e. poor man's integral) of recent errors
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* sharpening non-zero when fast response is needed (i.e. right after
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* association or no frames sent for a long time), heading
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* to zero over time
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* CP Proportional coefficient
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* CI Integral coefficient
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* CD Derivative coefficient
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*
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* CP, CI, CD are subject to careful tuning.
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*
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* The integral component uses a exponential moving average approach instead of
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* an actual sliding window. The advantage is that we don't need to keep an
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* array of the last N error values and computation is easier.
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*
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* Once we have the adj value, we map it to a rate by means of a learning
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* algorithm. This algorithm keeps the state of the percentual failed frames
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* difference between rates. The behaviour of the lowest available rate is kept
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* as a reference value, and every time we switch between two rates, we compute
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* the difference between the failed frames each rate exhibited. By doing so,
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* we compare behaviours which different rates exhibited in adjacent timeslices,
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* thus the comparison is minimally affected by external conditions. This
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* difference gets propagated to the whole set of measurements, so that the
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* reference is always the same. Periodically, we normalize this set so that
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* recent events weigh the most. By comparing the adj value with this set, we
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* avoid pejorative switches to lower rates and allow for switches to higher
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* rates if they behaved well.
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*
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* Note that for the computations we use a fixed-point representation to avoid
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* floating point arithmetic. Hence, all values are shifted left by
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* RC_PID_ARITH_SHIFT.
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*/
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/* Adjust the rate while ensuring that we won't switch to a lower rate if it
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* exhibited a worse failed frames behaviour and we'll choose the highest rate
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* whose failed frames behaviour is not worse than the one of the original rate
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* target. While at it, check that the new rate is valid. */
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static void rate_control_pid_adjust_rate(struct ieee80211_local *local,
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struct sta_info *sta, int adj,
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struct rc_pid_rateinfo *rinfo)
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{
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struct ieee80211_sub_if_data *sdata;
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struct ieee80211_supported_band *sband;
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int cur_sorted, new_sorted, probe, tmp, n_bitrates, band;
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int cur = sta->txrate_idx;
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sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
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sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
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band = sband->band;
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n_bitrates = sband->n_bitrates;
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/* Map passed arguments to sorted values. */
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cur_sorted = rinfo[cur].rev_index;
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new_sorted = cur_sorted + adj;
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/* Check limits. */
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if (new_sorted < 0)
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new_sorted = rinfo[0].rev_index;
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else if (new_sorted >= n_bitrates)
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new_sorted = rinfo[n_bitrates - 1].rev_index;
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tmp = new_sorted;
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if (adj < 0) {
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/* Ensure that the rate decrease isn't disadvantageous. */
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for (probe = cur_sorted; probe >= new_sorted; probe--)
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if (rinfo[probe].diff <= rinfo[cur_sorted].diff &&
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rate_supported(sta, band, rinfo[probe].index))
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tmp = probe;
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} else {
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/* Look for rate increase with zero (or below) cost. */
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for (probe = new_sorted + 1; probe < n_bitrates; probe++)
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if (rinfo[probe].diff <= rinfo[new_sorted].diff &&
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rate_supported(sta, band, rinfo[probe].index))
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tmp = probe;
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}
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/* Fit the rate found to the nearest supported rate. */
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do {
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if (rate_supported(sta, band, rinfo[tmp].index)) {
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sta->txrate_idx = rinfo[tmp].index;
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break;
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}
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if (adj < 0)
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tmp--;
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else
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tmp++;
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} while (tmp < n_bitrates && tmp >= 0);
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#ifdef CONFIG_MAC80211_DEBUGFS
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rate_control_pid_event_rate_change(
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&((struct rc_pid_sta_info *)sta->rate_ctrl_priv)->events,
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sta->txrate_idx, sband->bitrates[sta->txrate_idx].bitrate);
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#endif
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}
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/* Normalize the failed frames per-rate differences. */
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static void rate_control_pid_normalize(struct rc_pid_info *pinfo, int l)
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{
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int i, norm_offset = pinfo->norm_offset;
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struct rc_pid_rateinfo *r = pinfo->rinfo;
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if (r[0].diff > norm_offset)
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r[0].diff -= norm_offset;
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else if (r[0].diff < -norm_offset)
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r[0].diff += norm_offset;
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for (i = 0; i < l - 1; i++)
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if (r[i + 1].diff > r[i].diff + norm_offset)
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r[i + 1].diff -= norm_offset;
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else if (r[i + 1].diff <= r[i].diff)
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r[i + 1].diff += norm_offset;
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}
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static void rate_control_pid_sample(struct rc_pid_info *pinfo,
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struct ieee80211_local *local,
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struct sta_info *sta)
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{
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struct rc_pid_sta_info *spinfo = sta->rate_ctrl_priv;
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struct rc_pid_rateinfo *rinfo = pinfo->rinfo;
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struct ieee80211_supported_band *sband;
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u32 pf;
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s32 err_avg;
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u32 err_prop;
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u32 err_int;
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u32 err_der;
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int adj, i, j, tmp;
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unsigned long period;
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sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
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spinfo = sta->rate_ctrl_priv;
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/* In case nothing happened during the previous control interval, turn
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* the sharpening factor on. */
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period = (HZ * pinfo->sampling_period + 500) / 1000;
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if (!period)
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period = 1;
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if (jiffies - spinfo->last_sample > 2 * period)
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spinfo->sharp_cnt = pinfo->sharpen_duration;
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spinfo->last_sample = jiffies;
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/* This should never happen, but in case, we assume the old sample is
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* still a good measurement and copy it. */
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if (unlikely(spinfo->tx_num_xmit == 0))
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pf = spinfo->last_pf;
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else {
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pf = spinfo->tx_num_failed * 100 / spinfo->tx_num_xmit;
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pf <<= RC_PID_ARITH_SHIFT;
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}
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spinfo->tx_num_xmit = 0;
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spinfo->tx_num_failed = 0;
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/* If we just switched rate, update the rate behaviour info. */
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if (pinfo->oldrate != sta->txrate_idx) {
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i = rinfo[pinfo->oldrate].rev_index;
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j = rinfo[sta->txrate_idx].rev_index;
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tmp = (pf - spinfo->last_pf);
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tmp = RC_PID_DO_ARITH_RIGHT_SHIFT(tmp, RC_PID_ARITH_SHIFT);
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rinfo[j].diff = rinfo[i].diff + tmp;
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pinfo->oldrate = sta->txrate_idx;
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}
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rate_control_pid_normalize(pinfo, sband->n_bitrates);
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/* Compute the proportional, integral and derivative errors. */
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err_prop = (pinfo->target << RC_PID_ARITH_SHIFT) - pf;
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err_avg = spinfo->err_avg_sc >> pinfo->smoothing_shift;
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spinfo->err_avg_sc = spinfo->err_avg_sc - err_avg + err_prop;
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err_int = spinfo->err_avg_sc >> pinfo->smoothing_shift;
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err_der = (pf - spinfo->last_pf) *
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(1 + pinfo->sharpen_factor * spinfo->sharp_cnt);
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spinfo->last_pf = pf;
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if (spinfo->sharp_cnt)
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spinfo->sharp_cnt--;
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#ifdef CONFIG_MAC80211_DEBUGFS
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rate_control_pid_event_pf_sample(&spinfo->events, pf, err_prop, err_int,
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err_der);
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#endif
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/* Compute the controller output. */
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adj = (err_prop * pinfo->coeff_p + err_int * pinfo->coeff_i
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+ err_der * pinfo->coeff_d);
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adj = RC_PID_DO_ARITH_RIGHT_SHIFT(adj, 2 * RC_PID_ARITH_SHIFT);
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/* Change rate. */
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if (adj)
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rate_control_pid_adjust_rate(local, sta, adj, rinfo);
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}
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static void rate_control_pid_tx_status(void *priv, struct net_device *dev,
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struct sk_buff *skb,
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struct ieee80211_tx_status *status)
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{
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struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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struct ieee80211_sub_if_data *sdata;
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struct rc_pid_info *pinfo = priv;
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struct sta_info *sta;
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struct rc_pid_sta_info *spinfo;
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unsigned long period;
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struct ieee80211_supported_band *sband;
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sta = sta_info_get(local, hdr->addr1);
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sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
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if (!sta)
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return;
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/* Don't update the state if we're not controlling the rate. */
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sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
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if (sdata->bss && sdata->bss->force_unicast_rateidx > -1) {
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sta->txrate_idx = sdata->bss->max_ratectrl_rateidx;
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return;
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}
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/* Ignore all frames that were sent with a different rate than the rate
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* we currently advise mac80211 to use. */
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if (status->control.tx_rate != &sband->bitrates[sta->txrate_idx])
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goto ignore;
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spinfo = sta->rate_ctrl_priv;
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spinfo->tx_num_xmit++;
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#ifdef CONFIG_MAC80211_DEBUGFS
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rate_control_pid_event_tx_status(&spinfo->events, status);
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#endif
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/* We count frames that totally failed to be transmitted as two bad
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* frames, those that made it out but had some retries as one good and
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* one bad frame. */
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if (status->excessive_retries) {
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spinfo->tx_num_failed += 2;
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spinfo->tx_num_xmit++;
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} else if (status->retry_count) {
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spinfo->tx_num_failed++;
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spinfo->tx_num_xmit++;
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}
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if (status->excessive_retries) {
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sta->tx_retry_failed++;
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sta->tx_num_consecutive_failures++;
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sta->tx_num_mpdu_fail++;
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} else {
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sta->tx_num_consecutive_failures = 0;
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sta->tx_num_mpdu_ok++;
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}
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sta->tx_retry_count += status->retry_count;
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sta->tx_num_mpdu_fail += status->retry_count;
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/* Update PID controller state. */
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period = (HZ * pinfo->sampling_period + 500) / 1000;
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if (!period)
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period = 1;
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if (time_after(jiffies, spinfo->last_sample + period))
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rate_control_pid_sample(pinfo, local, sta);
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ignore:
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sta_info_put(sta);
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}
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static void rate_control_pid_get_rate(void *priv, struct net_device *dev,
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struct ieee80211_supported_band *sband,
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struct sk_buff *skb,
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struct rate_selection *sel)
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{
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struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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struct ieee80211_sub_if_data *sdata;
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struct sta_info *sta;
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int rateidx;
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u16 fc;
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sta = sta_info_get(local, hdr->addr1);
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/* Send management frames and broadcast/multicast data using lowest
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* rate. */
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fc = le16_to_cpu(hdr->frame_control);
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if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
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is_multicast_ether_addr(hdr->addr1) || !sta) {
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sel->rate = rate_lowest(local, sband, sta);
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if (sta)
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sta_info_put(sta);
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return;
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}
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/* If a forced rate is in effect, select it. */
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sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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if (sdata->bss && sdata->bss->force_unicast_rateidx > -1)
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sta->txrate_idx = sdata->bss->force_unicast_rateidx;
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rateidx = sta->txrate_idx;
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if (rateidx >= sband->n_bitrates)
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rateidx = sband->n_bitrates - 1;
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sta->last_txrate_idx = rateidx;
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sta_info_put(sta);
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sel->rate = &sband->bitrates[rateidx];
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#ifdef CONFIG_MAC80211_DEBUGFS
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rate_control_pid_event_tx_rate(
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&((struct rc_pid_sta_info *) sta->rate_ctrl_priv)->events,
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rateidx, sband->bitrates[rateidx].bitrate);
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#endif
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}
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static void rate_control_pid_rate_init(void *priv, void *priv_sta,
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struct ieee80211_local *local,
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struct sta_info *sta)
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{
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/* TODO: This routine should consider using RSSI from previous packets
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* as we need to have IEEE 802.1X auth succeed immediately after assoc..
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* Until that method is implemented, we will use the lowest supported
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* rate as a workaround. */
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struct ieee80211_supported_band *sband;
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sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
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sta->txrate_idx = rate_lowest_index(local, sband, sta);
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}
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static void *rate_control_pid_alloc(struct ieee80211_local *local)
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{
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struct rc_pid_info *pinfo;
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struct rc_pid_rateinfo *rinfo;
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struct ieee80211_supported_band *sband;
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int i, j, tmp;
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bool s;
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#ifdef CONFIG_MAC80211_DEBUGFS
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struct rc_pid_debugfs_entries *de;
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#endif
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sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
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pinfo = kmalloc(sizeof(*pinfo), GFP_ATOMIC);
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if (!pinfo)
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return NULL;
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/* We can safely assume that sband won't change unless we get
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* reinitialized. */
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rinfo = kmalloc(sizeof(*rinfo) * sband->n_bitrates, GFP_ATOMIC);
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if (!rinfo) {
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kfree(pinfo);
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return NULL;
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}
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/* Sort the rates. This is optimized for the most common case (i.e.
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* almost-sorted CCK+OFDM rates). Kind of bubble-sort with reversed
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* mapping too. */
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for (i = 0; i < sband->n_bitrates; i++) {
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rinfo[i].index = i;
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rinfo[i].rev_index = i;
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if (pinfo->fast_start)
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rinfo[i].diff = 0;
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else
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rinfo[i].diff = i * pinfo->norm_offset;
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}
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for (i = 1; i < sband->n_bitrates; i++) {
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s = 0;
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for (j = 0; j < sband->n_bitrates - i; j++)
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if (unlikely(sband->bitrates[rinfo[j].index].bitrate >
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sband->bitrates[rinfo[j + 1].index].bitrate)) {
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tmp = rinfo[j].index;
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rinfo[j].index = rinfo[j + 1].index;
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rinfo[j + 1].index = tmp;
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rinfo[rinfo[j].index].rev_index = j;
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rinfo[rinfo[j + 1].index].rev_index = j + 1;
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s = 1;
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}
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if (!s)
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break;
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}
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pinfo->target = RC_PID_TARGET_PF;
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pinfo->sampling_period = RC_PID_INTERVAL;
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pinfo->coeff_p = RC_PID_COEFF_P;
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pinfo->coeff_i = RC_PID_COEFF_I;
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pinfo->coeff_d = RC_PID_COEFF_D;
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pinfo->smoothing_shift = RC_PID_SMOOTHING_SHIFT;
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pinfo->sharpen_factor = RC_PID_SHARPENING_FACTOR;
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pinfo->sharpen_duration = RC_PID_SHARPENING_DURATION;
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pinfo->norm_offset = RC_PID_NORM_OFFSET;
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pinfo->fast_start = RC_PID_FAST_START;
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pinfo->rinfo = rinfo;
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pinfo->oldrate = 0;
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#ifdef CONFIG_MAC80211_DEBUGFS
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de = &pinfo->dentries;
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de->dir = debugfs_create_dir("rc80211_pid",
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local->hw.wiphy->debugfsdir);
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de->target = debugfs_create_u32("target_pf", S_IRUSR | S_IWUSR,
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de->dir, &pinfo->target);
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de->sampling_period = debugfs_create_u32("sampling_period",
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S_IRUSR | S_IWUSR, de->dir,
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&pinfo->sampling_period);
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de->coeff_p = debugfs_create_u32("coeff_p", S_IRUSR | S_IWUSR,
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de->dir, &pinfo->coeff_p);
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de->coeff_i = debugfs_create_u32("coeff_i", S_IRUSR | S_IWUSR,
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de->dir, &pinfo->coeff_i);
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de->coeff_d = debugfs_create_u32("coeff_d", S_IRUSR | S_IWUSR,
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de->dir, &pinfo->coeff_d);
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de->smoothing_shift = debugfs_create_u32("smoothing_shift",
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S_IRUSR | S_IWUSR, de->dir,
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&pinfo->smoothing_shift);
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de->sharpen_factor = debugfs_create_u32("sharpen_factor",
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S_IRUSR | S_IWUSR, de->dir,
|
|
&pinfo->sharpen_factor);
|
|
de->sharpen_duration = debugfs_create_u32("sharpen_duration",
|
|
S_IRUSR | S_IWUSR, de->dir,
|
|
&pinfo->sharpen_duration);
|
|
de->norm_offset = debugfs_create_u32("norm_offset",
|
|
S_IRUSR | S_IWUSR, de->dir,
|
|
&pinfo->norm_offset);
|
|
de->fast_start = debugfs_create_bool("fast_start",
|
|
S_IRUSR | S_IWUSR, de->dir,
|
|
&pinfo->fast_start);
|
|
#endif
|
|
|
|
return pinfo;
|
|
}
|
|
|
|
static void rate_control_pid_free(void *priv)
|
|
{
|
|
struct rc_pid_info *pinfo = priv;
|
|
#ifdef CONFIG_MAC80211_DEBUGFS
|
|
struct rc_pid_debugfs_entries *de = &pinfo->dentries;
|
|
|
|
debugfs_remove(de->fast_start);
|
|
debugfs_remove(de->norm_offset);
|
|
debugfs_remove(de->sharpen_duration);
|
|
debugfs_remove(de->sharpen_factor);
|
|
debugfs_remove(de->smoothing_shift);
|
|
debugfs_remove(de->coeff_d);
|
|
debugfs_remove(de->coeff_i);
|
|
debugfs_remove(de->coeff_p);
|
|
debugfs_remove(de->sampling_period);
|
|
debugfs_remove(de->target);
|
|
debugfs_remove(de->dir);
|
|
#endif
|
|
|
|
kfree(pinfo->rinfo);
|
|
kfree(pinfo);
|
|
}
|
|
|
|
static void rate_control_pid_clear(void *priv)
|
|
{
|
|
}
|
|
|
|
static void *rate_control_pid_alloc_sta(void *priv, gfp_t gfp)
|
|
{
|
|
struct rc_pid_sta_info *spinfo;
|
|
|
|
spinfo = kzalloc(sizeof(*spinfo), gfp);
|
|
if (spinfo == NULL)
|
|
return NULL;
|
|
|
|
spinfo->last_sample = jiffies;
|
|
|
|
#ifdef CONFIG_MAC80211_DEBUGFS
|
|
spin_lock_init(&spinfo->events.lock);
|
|
init_waitqueue_head(&spinfo->events.waitqueue);
|
|
#endif
|
|
|
|
return spinfo;
|
|
}
|
|
|
|
static void rate_control_pid_free_sta(void *priv, void *priv_sta)
|
|
{
|
|
struct rc_pid_sta_info *spinfo = priv_sta;
|
|
kfree(spinfo);
|
|
}
|
|
|
|
static struct rate_control_ops mac80211_rcpid = {
|
|
.name = "pid",
|
|
.tx_status = rate_control_pid_tx_status,
|
|
.get_rate = rate_control_pid_get_rate,
|
|
.rate_init = rate_control_pid_rate_init,
|
|
.clear = rate_control_pid_clear,
|
|
.alloc = rate_control_pid_alloc,
|
|
.free = rate_control_pid_free,
|
|
.alloc_sta = rate_control_pid_alloc_sta,
|
|
.free_sta = rate_control_pid_free_sta,
|
|
#ifdef CONFIG_MAC80211_DEBUGFS
|
|
.add_sta_debugfs = rate_control_pid_add_sta_debugfs,
|
|
.remove_sta_debugfs = rate_control_pid_remove_sta_debugfs,
|
|
#endif
|
|
};
|
|
|
|
MODULE_DESCRIPTION("PID controller based rate control algorithm");
|
|
MODULE_AUTHOR("Stefano Brivio");
|
|
MODULE_AUTHOR("Mattias Nissler");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
int __init rc80211_pid_init(void)
|
|
{
|
|
return ieee80211_rate_control_register(&mac80211_rcpid);
|
|
}
|
|
|
|
void rc80211_pid_exit(void)
|
|
{
|
|
ieee80211_rate_control_unregister(&mac80211_rcpid);
|
|
}
|
|
|
|
#ifdef CONFIG_MAC80211_RC_PID_MODULE
|
|
module_init(rc80211_pid_init);
|
|
module_exit(rc80211_pid_exit);
|
|
#endif
|