![Thomas Huehn](/assets/img/avatar_default.png)
Minstrel and Mintrel_HT used there own structs to keep track of rate statistics. Unify those variables in struct minstrel_rate_states and move it to rc80211_minstrel.h for common usage. This is a clean-up patch to prepare Minstrel and Minstrel_HT codebase for upcoming TPC. Signed-off-by: Thomas Huehn <thomas@net.t-labs.tu-berlin.de> Acked-by: Felix Fietkau <nbd@openwrt.org> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
703 lines
20 KiB
C
703 lines
20 KiB
C
/*
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* Copyright (C) 2008 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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* Based on minstrel.c:
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* Copyright (C) 2005-2007 Derek Smithies <derek@indranet.co.nz>
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* Sponsored by Indranet Technologies Ltd
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*
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* Based on sample.c:
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* Copyright (c) 2005 John Bicket
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
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* redistribution must be conditioned upon including a substantially
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* similar Disclaimer requirement for further binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
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* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGES.
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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 <linux/slab.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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#define SAMPLE_TBL(_mi, _idx, _col) \
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_mi->sample_table[(_idx * SAMPLE_COLUMNS) + _col]
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/* convert mac80211 rate index to local array index */
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static inline int
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rix_to_ndx(struct minstrel_sta_info *mi, int rix)
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{
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int i = rix;
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for (i = rix; i >= 0; i--)
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if (mi->r[i].rix == rix)
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break;
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return i;
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}
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/* find & sort topmost throughput rates */
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static inline void
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minstrel_sort_best_tp_rates(struct minstrel_sta_info *mi, int i, u8 *tp_list)
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{
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int j = MAX_THR_RATES;
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while (j > 0 && mi->r[i].stats.cur_tp > mi->r[tp_list[j - 1]].stats.cur_tp)
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j--;
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if (j < MAX_THR_RATES - 1)
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memmove(&tp_list[j + 1], &tp_list[j], MAX_THR_RATES - (j + 1));
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if (j < MAX_THR_RATES)
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tp_list[j] = i;
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}
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static void
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minstrel_set_rate(struct minstrel_sta_info *mi, struct ieee80211_sta_rates *ratetbl,
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int offset, int idx)
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{
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struct minstrel_rate *r = &mi->r[idx];
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ratetbl->rate[offset].idx = r->rix;
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ratetbl->rate[offset].count = r->adjusted_retry_count;
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ratetbl->rate[offset].count_cts = r->retry_count_cts;
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ratetbl->rate[offset].count_rts = r->stats.retry_count_rtscts;
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}
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static void
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minstrel_update_rates(struct minstrel_priv *mp, struct minstrel_sta_info *mi)
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{
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struct ieee80211_sta_rates *ratetbl;
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int i = 0;
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ratetbl = kzalloc(sizeof(*ratetbl), GFP_ATOMIC);
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if (!ratetbl)
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return;
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/* Start with max_tp_rate */
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minstrel_set_rate(mi, ratetbl, i++, mi->max_tp_rate[0]);
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if (mp->hw->max_rates >= 3) {
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/* At least 3 tx rates supported, use max_tp_rate2 next */
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minstrel_set_rate(mi, ratetbl, i++, mi->max_tp_rate[1]);
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}
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if (mp->hw->max_rates >= 2) {
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/* At least 2 tx rates supported, use max_prob_rate next */
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minstrel_set_rate(mi, ratetbl, i++, mi->max_prob_rate);
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}
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/* Use lowest rate last */
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ratetbl->rate[i].idx = mi->lowest_rix;
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ratetbl->rate[i].count = mp->max_retry;
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ratetbl->rate[i].count_cts = mp->max_retry;
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ratetbl->rate[i].count_rts = mp->max_retry;
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rate_control_set_rates(mp->hw, mi->sta, ratetbl);
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}
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static void
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minstrel_update_stats(struct minstrel_priv *mp, struct minstrel_sta_info *mi)
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{
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u8 tmp_tp_rate[MAX_THR_RATES];
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u8 tmp_prob_rate = 0;
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u32 usecs;
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int i;
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for (i = 0; i < MAX_THR_RATES; i++)
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tmp_tp_rate[i] = 0;
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for (i = 0; i < mi->n_rates; i++) {
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struct minstrel_rate *mr = &mi->r[i];
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struct minstrel_rate_stats *mrs = &mi->r[i].stats;
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usecs = mr->perfect_tx_time;
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if (!usecs)
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usecs = 1000000;
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if (unlikely(mrs->attempts > 0)) {
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mrs->sample_skipped = 0;
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mrs->cur_prob = MINSTREL_FRAC(mrs->success,
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mrs->attempts);
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mrs->succ_hist += mrs->success;
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mrs->att_hist += mrs->attempts;
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mrs->probability = minstrel_ewma(mrs->probability,
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mrs->cur_prob,
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EWMA_LEVEL);
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} else
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mrs->sample_skipped++;
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mrs->last_success = mrs->success;
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mrs->last_attempts = mrs->attempts;
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mrs->success = 0;
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mrs->attempts = 0;
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/* Update throughput per rate, reset thr. below 10% success */
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if (mrs->probability < MINSTREL_FRAC(10, 100))
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mrs->cur_tp = 0;
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else
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mrs->cur_tp = mrs->probability * (1000000 / usecs);
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/* Sample less often below the 10% chance of success.
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* Sample less often above the 95% chance of success. */
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if (mrs->probability > MINSTREL_FRAC(95, 100) ||
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mrs->probability < MINSTREL_FRAC(10, 100)) {
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mr->adjusted_retry_count = mrs->retry_count >> 1;
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if (mr->adjusted_retry_count > 2)
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mr->adjusted_retry_count = 2;
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mr->sample_limit = 4;
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} else {
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mr->sample_limit = -1;
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mr->adjusted_retry_count = mrs->retry_count;
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}
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if (!mr->adjusted_retry_count)
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mr->adjusted_retry_count = 2;
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minstrel_sort_best_tp_rates(mi, i, tmp_tp_rate);
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/* To determine the most robust rate (max_prob_rate) used at
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* 3rd mmr stage we distinct between two cases:
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* (1) if any success probabilitiy >= 95%, out of those rates
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* choose the maximum throughput rate as max_prob_rate
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* (2) if all success probabilities < 95%, the rate with
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* highest success probability is choosen as max_prob_rate */
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if (mrs->probability >= MINSTREL_FRAC(95, 100)) {
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if (mrs->cur_tp >= mi->r[tmp_prob_rate].stats.cur_tp)
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tmp_prob_rate = i;
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} else {
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if (mrs->probability >= mi->r[tmp_prob_rate].stats.probability)
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tmp_prob_rate = i;
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}
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}
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/* Assign the new rate set */
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memcpy(mi->max_tp_rate, tmp_tp_rate, sizeof(mi->max_tp_rate));
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mi->max_prob_rate = tmp_prob_rate;
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#ifdef CONFIG_MAC80211_DEBUGFS
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/* use fixed index if set */
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if (mp->fixed_rate_idx != -1) {
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mi->max_tp_rate[0] = mp->fixed_rate_idx;
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mi->max_tp_rate[1] = mp->fixed_rate_idx;
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mi->max_prob_rate = mp->fixed_rate_idx;
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}
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#endif
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/* Reset update timer */
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mi->stats_update = jiffies;
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minstrel_update_rates(mp, mi);
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}
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static void
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minstrel_tx_status(void *priv, struct ieee80211_supported_band *sband,
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struct ieee80211_sta *sta, void *priv_sta,
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struct sk_buff *skb)
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{
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struct minstrel_priv *mp = priv;
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struct minstrel_sta_info *mi = priv_sta;
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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struct ieee80211_tx_rate *ar = info->status.rates;
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int i, ndx;
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int success;
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success = !!(info->flags & IEEE80211_TX_STAT_ACK);
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for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
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if (ar[i].idx < 0)
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break;
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ndx = rix_to_ndx(mi, ar[i].idx);
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if (ndx < 0)
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continue;
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mi->r[ndx].stats.attempts += ar[i].count;
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if ((i != IEEE80211_TX_MAX_RATES - 1) && (ar[i + 1].idx < 0))
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mi->r[ndx].stats.success += success;
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}
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if ((info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) && (i >= 0))
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mi->sample_packets++;
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if (mi->sample_deferred > 0)
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mi->sample_deferred--;
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if (time_after(jiffies, mi->stats_update +
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(mp->update_interval * HZ) / 1000))
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minstrel_update_stats(mp, mi);
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}
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static inline unsigned int
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minstrel_get_retry_count(struct minstrel_rate *mr,
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struct ieee80211_tx_info *info)
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{
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unsigned int retry = mr->adjusted_retry_count;
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if (info->control.use_rts)
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retry = max(2U, min(mr->stats.retry_count_rtscts, retry));
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else if (info->control.use_cts_prot)
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retry = max(2U, min(mr->retry_count_cts, retry));
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return retry;
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}
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static int
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minstrel_get_next_sample(struct minstrel_sta_info *mi)
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{
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unsigned int sample_ndx;
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sample_ndx = SAMPLE_TBL(mi, mi->sample_row, mi->sample_column);
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mi->sample_row++;
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if ((int) mi->sample_row >= mi->n_rates) {
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mi->sample_row = 0;
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mi->sample_column++;
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if (mi->sample_column >= SAMPLE_COLUMNS)
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mi->sample_column = 0;
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}
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return sample_ndx;
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}
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static void
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minstrel_get_rate(void *priv, struct ieee80211_sta *sta,
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void *priv_sta, struct ieee80211_tx_rate_control *txrc)
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{
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struct sk_buff *skb = txrc->skb;
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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struct minstrel_sta_info *mi = priv_sta;
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struct minstrel_priv *mp = priv;
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struct ieee80211_tx_rate *rate = &info->control.rates[0];
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struct minstrel_rate *msr, *mr;
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unsigned int ndx;
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bool mrr_capable;
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bool prev_sample;
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int delta;
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int sampling_ratio;
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/* management/no-ack frames do not use rate control */
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if (rate_control_send_low(sta, priv_sta, txrc))
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return;
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/* check multi-rate-retry capabilities & adjust lookaround_rate */
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mrr_capable = mp->has_mrr &&
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!txrc->rts &&
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!txrc->bss_conf->use_cts_prot;
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if (mrr_capable)
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sampling_ratio = mp->lookaround_rate_mrr;
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else
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sampling_ratio = mp->lookaround_rate;
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/* increase sum packet counter */
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mi->total_packets++;
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#ifdef CONFIG_MAC80211_DEBUGFS
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if (mp->fixed_rate_idx != -1)
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return;
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#endif
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delta = (mi->total_packets * sampling_ratio / 100) -
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(mi->sample_packets + mi->sample_deferred / 2);
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/* delta < 0: no sampling required */
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prev_sample = mi->prev_sample;
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mi->prev_sample = false;
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if (delta < 0 || (!mrr_capable && prev_sample))
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return;
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if (mi->total_packets >= 10000) {
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mi->sample_deferred = 0;
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mi->sample_packets = 0;
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mi->total_packets = 0;
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} else if (delta > mi->n_rates * 2) {
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/* With multi-rate retry, not every planned sample
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* attempt actually gets used, due to the way the retry
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* chain is set up - [max_tp,sample,prob,lowest] for
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* sample_rate < max_tp.
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*
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* If there's too much sampling backlog and the link
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* starts getting worse, minstrel would start bursting
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* out lots of sampling frames, which would result
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* in a large throughput loss. */
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mi->sample_packets += (delta - mi->n_rates * 2);
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}
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/* get next random rate sample */
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ndx = minstrel_get_next_sample(mi);
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msr = &mi->r[ndx];
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mr = &mi->r[mi->max_tp_rate[0]];
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/* Decide if direct ( 1st mrr stage) or indirect (2nd mrr stage)
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* rate sampling method should be used.
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* Respect such rates that are not sampled for 20 interations.
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*/
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if (mrr_capable &&
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msr->perfect_tx_time > mr->perfect_tx_time &&
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msr->stats.sample_skipped < 20) {
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/* Only use IEEE80211_TX_CTL_RATE_CTRL_PROBE to mark
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* packets that have the sampling rate deferred to the
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* second MRR stage. Increase the sample counter only
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* if the deferred sample rate was actually used.
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* Use the sample_deferred counter to make sure that
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* the sampling is not done in large bursts */
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info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
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rate++;
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mi->sample_deferred++;
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} else {
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if (!msr->sample_limit != 0)
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return;
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mi->sample_packets++;
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if (msr->sample_limit > 0)
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msr->sample_limit--;
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}
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/* If we're not using MRR and the sampling rate already
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* has a probability of >95%, we shouldn't be attempting
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* to use it, as this only wastes precious airtime */
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if (!mrr_capable &&
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(mi->r[ndx].stats.probability > MINSTREL_FRAC(95, 100)))
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return;
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mi->prev_sample = true;
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rate->idx = mi->r[ndx].rix;
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rate->count = minstrel_get_retry_count(&mi->r[ndx], info);
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}
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static void
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calc_rate_durations(enum ieee80211_band band,
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struct minstrel_rate *d,
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struct ieee80211_rate *rate,
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struct cfg80211_chan_def *chandef)
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{
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int erp = !!(rate->flags & IEEE80211_RATE_ERP_G);
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int shift = ieee80211_chandef_get_shift(chandef);
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d->perfect_tx_time = ieee80211_frame_duration(band, 1200,
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DIV_ROUND_UP(rate->bitrate, 1 << shift), erp, 1,
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shift);
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d->ack_time = ieee80211_frame_duration(band, 10,
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DIV_ROUND_UP(rate->bitrate, 1 << shift), erp, 1,
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shift);
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}
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static void
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init_sample_table(struct minstrel_sta_info *mi)
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{
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unsigned int i, col, new_idx;
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u8 rnd[8];
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mi->sample_column = 0;
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mi->sample_row = 0;
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memset(mi->sample_table, 0xff, SAMPLE_COLUMNS * mi->n_rates);
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for (col = 0; col < SAMPLE_COLUMNS; col++) {
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prandom_bytes(rnd, sizeof(rnd));
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for (i = 0; i < mi->n_rates; i++) {
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new_idx = (i + rnd[i & 7]) % mi->n_rates;
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while (SAMPLE_TBL(mi, new_idx, col) != 0xff)
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new_idx = (new_idx + 1) % mi->n_rates;
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SAMPLE_TBL(mi, new_idx, col) = i;
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}
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}
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}
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static void
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minstrel_rate_init(void *priv, struct ieee80211_supported_band *sband,
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struct cfg80211_chan_def *chandef,
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struct ieee80211_sta *sta, void *priv_sta)
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{
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struct minstrel_sta_info *mi = priv_sta;
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struct minstrel_priv *mp = priv;
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struct ieee80211_rate *ctl_rate;
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unsigned int i, n = 0;
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unsigned int t_slot = 9; /* FIXME: get real slot time */
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u32 rate_flags;
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mi->sta = sta;
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mi->lowest_rix = rate_lowest_index(sband, sta);
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ctl_rate = &sband->bitrates[mi->lowest_rix];
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mi->sp_ack_dur = ieee80211_frame_duration(sband->band, 10,
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ctl_rate->bitrate,
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!!(ctl_rate->flags & IEEE80211_RATE_ERP_G), 1,
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ieee80211_chandef_get_shift(chandef));
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rate_flags = ieee80211_chandef_rate_flags(&mp->hw->conf.chandef);
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memset(mi->max_tp_rate, 0, sizeof(mi->max_tp_rate));
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mi->max_prob_rate = 0;
|
|
|
|
for (i = 0; i < sband->n_bitrates; i++) {
|
|
struct minstrel_rate *mr = &mi->r[n];
|
|
struct minstrel_rate_stats *mrs = &mi->r[n].stats;
|
|
unsigned int tx_time = 0, tx_time_cts = 0, tx_time_rtscts = 0;
|
|
unsigned int tx_time_single;
|
|
unsigned int cw = mp->cw_min;
|
|
int shift;
|
|
|
|
if (!rate_supported(sta, sband->band, i))
|
|
continue;
|
|
if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
|
|
continue;
|
|
|
|
n++;
|
|
memset(mr, 0, sizeof(*mr));
|
|
memset(mrs, 0, sizeof(*mrs));
|
|
|
|
mr->rix = i;
|
|
shift = ieee80211_chandef_get_shift(chandef);
|
|
mr->bitrate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
|
|
(1 << shift) * 5);
|
|
calc_rate_durations(sband->band, mr, &sband->bitrates[i],
|
|
chandef);
|
|
|
|
/* calculate maximum number of retransmissions before
|
|
* fallback (based on maximum segment size) */
|
|
mr->sample_limit = -1;
|
|
mrs->retry_count = 1;
|
|
mr->retry_count_cts = 1;
|
|
mrs->retry_count_rtscts = 1;
|
|
tx_time = mr->perfect_tx_time + mi->sp_ack_dur;
|
|
do {
|
|
/* add one retransmission */
|
|
tx_time_single = mr->ack_time + mr->perfect_tx_time;
|
|
|
|
/* contention window */
|
|
tx_time_single += (t_slot * cw) >> 1;
|
|
cw = min((cw << 1) | 1, mp->cw_max);
|
|
|
|
tx_time += tx_time_single;
|
|
tx_time_cts += tx_time_single + mi->sp_ack_dur;
|
|
tx_time_rtscts += tx_time_single + 2 * mi->sp_ack_dur;
|
|
if ((tx_time_cts < mp->segment_size) &&
|
|
(mr->retry_count_cts < mp->max_retry))
|
|
mr->retry_count_cts++;
|
|
if ((tx_time_rtscts < mp->segment_size) &&
|
|
(mrs->retry_count_rtscts < mp->max_retry))
|
|
mrs->retry_count_rtscts++;
|
|
} while ((tx_time < mp->segment_size) &&
|
|
(++mr->stats.retry_count < mp->max_retry));
|
|
mr->adjusted_retry_count = mrs->retry_count;
|
|
if (!(sband->bitrates[i].flags & IEEE80211_RATE_ERP_G))
|
|
mr->retry_count_cts = mrs->retry_count;
|
|
}
|
|
|
|
for (i = n; i < sband->n_bitrates; i++) {
|
|
struct minstrel_rate *mr = &mi->r[i];
|
|
mr->rix = -1;
|
|
}
|
|
|
|
mi->n_rates = n;
|
|
mi->stats_update = jiffies;
|
|
|
|
init_sample_table(mi);
|
|
minstrel_update_rates(mp, mi);
|
|
}
|
|
|
|
static void *
|
|
minstrel_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp)
|
|
{
|
|
struct ieee80211_supported_band *sband;
|
|
struct minstrel_sta_info *mi;
|
|
struct minstrel_priv *mp = priv;
|
|
struct ieee80211_hw *hw = mp->hw;
|
|
int max_rates = 0;
|
|
int i;
|
|
|
|
mi = kzalloc(sizeof(struct minstrel_sta_info), gfp);
|
|
if (!mi)
|
|
return NULL;
|
|
|
|
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;
|
|
}
|
|
|
|
mi->r = kzalloc(sizeof(struct minstrel_rate) * max_rates, gfp);
|
|
if (!mi->r)
|
|
goto error;
|
|
|
|
mi->sample_table = kmalloc(SAMPLE_COLUMNS * max_rates, gfp);
|
|
if (!mi->sample_table)
|
|
goto error1;
|
|
|
|
mi->stats_update = jiffies;
|
|
return mi;
|
|
|
|
error1:
|
|
kfree(mi->r);
|
|
error:
|
|
kfree(mi);
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
minstrel_free_sta(void *priv, struct ieee80211_sta *sta, void *priv_sta)
|
|
{
|
|
struct minstrel_sta_info *mi = priv_sta;
|
|
|
|
kfree(mi->sample_table);
|
|
kfree(mi->r);
|
|
kfree(mi);
|
|
}
|
|
|
|
static void
|
|
minstrel_init_cck_rates(struct minstrel_priv *mp)
|
|
{
|
|
static const int bitrates[4] = { 10, 20, 55, 110 };
|
|
struct ieee80211_supported_band *sband;
|
|
u32 rate_flags = ieee80211_chandef_rate_flags(&mp->hw->conf.chandef);
|
|
int i, j;
|
|
|
|
sband = mp->hw->wiphy->bands[IEEE80211_BAND_2GHZ];
|
|
if (!sband)
|
|
return;
|
|
|
|
for (i = 0, j = 0; i < sband->n_bitrates; i++) {
|
|
struct ieee80211_rate *rate = &sband->bitrates[i];
|
|
|
|
if (rate->flags & IEEE80211_RATE_ERP_G)
|
|
continue;
|
|
|
|
if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
|
|
continue;
|
|
|
|
for (j = 0; j < ARRAY_SIZE(bitrates); j++) {
|
|
if (rate->bitrate != bitrates[j])
|
|
continue;
|
|
|
|
mp->cck_rates[j] = i;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void *
|
|
minstrel_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
|
|
{
|
|
struct minstrel_priv *mp;
|
|
|
|
mp = kzalloc(sizeof(struct minstrel_priv), GFP_ATOMIC);
|
|
if (!mp)
|
|
return NULL;
|
|
|
|
/* contention window settings
|
|
* Just an approximation. Using the per-queue values would complicate
|
|
* the calculations and is probably unnecessary */
|
|
mp->cw_min = 15;
|
|
mp->cw_max = 1023;
|
|
|
|
/* number of packets (in %) to use for sampling other rates
|
|
* sample less often for non-mrr packets, because the overhead
|
|
* is much higher than with mrr */
|
|
mp->lookaround_rate = 5;
|
|
mp->lookaround_rate_mrr = 10;
|
|
|
|
/* maximum time that the hw is allowed to stay in one MRR segment */
|
|
mp->segment_size = 6000;
|
|
|
|
if (hw->max_rate_tries > 0)
|
|
mp->max_retry = hw->max_rate_tries;
|
|
else
|
|
/* safe default, does not necessarily have to match hw properties */
|
|
mp->max_retry = 7;
|
|
|
|
if (hw->max_rates >= 4)
|
|
mp->has_mrr = true;
|
|
|
|
mp->hw = hw;
|
|
mp->update_interval = 100;
|
|
|
|
#ifdef CONFIG_MAC80211_DEBUGFS
|
|
mp->fixed_rate_idx = (u32) -1;
|
|
mp->dbg_fixed_rate = debugfs_create_u32("fixed_rate_idx",
|
|
S_IRUGO | S_IWUGO, debugfsdir, &mp->fixed_rate_idx);
|
|
#endif
|
|
|
|
minstrel_init_cck_rates(mp);
|
|
|
|
return mp;
|
|
}
|
|
|
|
static void
|
|
minstrel_free(void *priv)
|
|
{
|
|
#ifdef CONFIG_MAC80211_DEBUGFS
|
|
debugfs_remove(((struct minstrel_priv *)priv)->dbg_fixed_rate);
|
|
#endif
|
|
kfree(priv);
|
|
}
|
|
|
|
static u32 minstrel_get_expected_throughput(void *priv_sta)
|
|
{
|
|
struct minstrel_sta_info *mi = priv_sta;
|
|
int idx = mi->max_tp_rate[0];
|
|
|
|
/* convert pkt per sec in kbps (1200 is the average pkt size used for
|
|
* computing cur_tp
|
|
*/
|
|
return MINSTREL_TRUNC(mi->r[idx].stats.cur_tp) * 1200 * 8 / 1024;
|
|
}
|
|
|
|
const struct rate_control_ops mac80211_minstrel = {
|
|
.name = "minstrel",
|
|
.tx_status = minstrel_tx_status,
|
|
.get_rate = minstrel_get_rate,
|
|
.rate_init = minstrel_rate_init,
|
|
.alloc = minstrel_alloc,
|
|
.free = minstrel_free,
|
|
.alloc_sta = minstrel_alloc_sta,
|
|
.free_sta = minstrel_free_sta,
|
|
#ifdef CONFIG_MAC80211_DEBUGFS
|
|
.add_sta_debugfs = minstrel_add_sta_debugfs,
|
|
.remove_sta_debugfs = minstrel_remove_sta_debugfs,
|
|
#endif
|
|
.get_expected_throughput = minstrel_get_expected_throughput,
|
|
};
|
|
|
|
int __init
|
|
rc80211_minstrel_init(void)
|
|
{
|
|
return ieee80211_rate_control_register(&mac80211_minstrel);
|
|
}
|
|
|
|
void
|
|
rc80211_minstrel_exit(void)
|
|
{
|
|
ieee80211_rate_control_unregister(&mac80211_minstrel);
|
|
}
|
|
|