![Felix Fietkau](/assets/img/avatar_default.png)
When MCS rates start to get bad in 2.4 GHz because of long range or strong interference, CCK rates can be a lot more robust. This patch adds a pseudo MCS group containing CCK rates (long preamble in the lower 4 slots, short preamble in the upper slots). Signed-off-by: Felix Fietkau <nbd@openwrt.org> [make minstrel_ht_get_stats static] Signed-off-by: Johannes Berg <johannes.berg@intel.com>
610 lines
16 KiB
C
610 lines
16 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* Based on minstrel.c:
|
|
* Copyright (C) 2005-2007 Derek Smithies <derek@indranet.co.nz>
|
|
* Sponsored by Indranet Technologies Ltd
|
|
*
|
|
* Based on sample.c:
|
|
* Copyright (c) 2005 John Bicket
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer,
|
|
* without modification.
|
|
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
|
|
* similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
|
|
* redistribution must be conditioned upon including a substantially
|
|
* similar Disclaimer requirement for further binary redistribution.
|
|
* 3. Neither the names of the above-listed copyright holders nor the names
|
|
* of any contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* Alternatively, this software may be distributed under the terms of the
|
|
* GNU General Public License ("GPL") version 2 as published by the Free
|
|
* Software Foundation.
|
|
*
|
|
* NO WARRANTY
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
|
|
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
|
|
* THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
|
|
* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
|
|
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
|
|
* THE POSSIBILITY OF SUCH DAMAGES.
|
|
*/
|
|
#include <linux/netdevice.h>
|
|
#include <linux/types.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/debugfs.h>
|
|
#include <linux/random.h>
|
|
#include <linux/ieee80211.h>
|
|
#include <linux/slab.h>
|
|
#include <net/mac80211.h>
|
|
#include "rate.h"
|
|
#include "rc80211_minstrel.h"
|
|
|
|
#define SAMPLE_COLUMNS 10
|
|
#define SAMPLE_TBL(_mi, _idx, _col) \
|
|
_mi->sample_table[(_idx * SAMPLE_COLUMNS) + _col]
|
|
|
|
/* convert mac80211 rate index to local array index */
|
|
static inline int
|
|
rix_to_ndx(struct minstrel_sta_info *mi, int rix)
|
|
{
|
|
int i = rix;
|
|
for (i = rix; i >= 0; i--)
|
|
if (mi->r[i].rix == rix)
|
|
break;
|
|
return i;
|
|
}
|
|
|
|
static void
|
|
minstrel_update_stats(struct minstrel_priv *mp, struct minstrel_sta_info *mi)
|
|
{
|
|
u32 max_tp = 0, index_max_tp = 0, index_max_tp2 = 0;
|
|
u32 max_prob = 0, index_max_prob = 0;
|
|
u32 usecs;
|
|
u32 p;
|
|
int i;
|
|
|
|
mi->stats_update = jiffies;
|
|
for (i = 0; i < mi->n_rates; i++) {
|
|
struct minstrel_rate *mr = &mi->r[i];
|
|
|
|
usecs = mr->perfect_tx_time;
|
|
if (!usecs)
|
|
usecs = 1000000;
|
|
|
|
/* To avoid rounding issues, probabilities scale from 0 (0%)
|
|
* to 18000 (100%) */
|
|
if (mr->attempts) {
|
|
p = (mr->success * 18000) / mr->attempts;
|
|
mr->succ_hist += mr->success;
|
|
mr->att_hist += mr->attempts;
|
|
mr->cur_prob = p;
|
|
p = ((p * (100 - mp->ewma_level)) + (mr->probability *
|
|
mp->ewma_level)) / 100;
|
|
mr->probability = p;
|
|
mr->cur_tp = p * (1000000 / usecs);
|
|
}
|
|
|
|
mr->last_success = mr->success;
|
|
mr->last_attempts = mr->attempts;
|
|
mr->success = 0;
|
|
mr->attempts = 0;
|
|
|
|
/* Sample less often below the 10% chance of success.
|
|
* Sample less often above the 95% chance of success. */
|
|
if ((mr->probability > 17100) || (mr->probability < 1800)) {
|
|
mr->adjusted_retry_count = mr->retry_count >> 1;
|
|
if (mr->adjusted_retry_count > 2)
|
|
mr->adjusted_retry_count = 2;
|
|
mr->sample_limit = 4;
|
|
} else {
|
|
mr->sample_limit = -1;
|
|
mr->adjusted_retry_count = mr->retry_count;
|
|
}
|
|
if (!mr->adjusted_retry_count)
|
|
mr->adjusted_retry_count = 2;
|
|
}
|
|
|
|
for (i = 0; i < mi->n_rates; i++) {
|
|
struct minstrel_rate *mr = &mi->r[i];
|
|
if (max_tp < mr->cur_tp) {
|
|
index_max_tp = i;
|
|
max_tp = mr->cur_tp;
|
|
}
|
|
if (max_prob < mr->probability) {
|
|
index_max_prob = i;
|
|
max_prob = mr->probability;
|
|
}
|
|
}
|
|
|
|
max_tp = 0;
|
|
for (i = 0; i < mi->n_rates; i++) {
|
|
struct minstrel_rate *mr = &mi->r[i];
|
|
|
|
if (i == index_max_tp)
|
|
continue;
|
|
|
|
if (max_tp < mr->cur_tp) {
|
|
index_max_tp2 = i;
|
|
max_tp = mr->cur_tp;
|
|
}
|
|
}
|
|
mi->max_tp_rate = index_max_tp;
|
|
mi->max_tp_rate2 = index_max_tp2;
|
|
mi->max_prob_rate = index_max_prob;
|
|
}
|
|
|
|
static void
|
|
minstrel_tx_status(void *priv, struct ieee80211_supported_band *sband,
|
|
struct ieee80211_sta *sta, void *priv_sta,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct minstrel_priv *mp = priv;
|
|
struct minstrel_sta_info *mi = priv_sta;
|
|
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
|
|
struct ieee80211_tx_rate *ar = info->status.rates;
|
|
int i, ndx;
|
|
int success;
|
|
|
|
success = !!(info->flags & IEEE80211_TX_STAT_ACK);
|
|
|
|
for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
|
|
if (ar[i].idx < 0)
|
|
break;
|
|
|
|
ndx = rix_to_ndx(mi, ar[i].idx);
|
|
if (ndx < 0)
|
|
continue;
|
|
|
|
mi->r[ndx].attempts += ar[i].count;
|
|
|
|
if ((i != IEEE80211_TX_MAX_RATES - 1) && (ar[i + 1].idx < 0))
|
|
mi->r[ndx].success += success;
|
|
}
|
|
|
|
if ((info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) && (i >= 0))
|
|
mi->sample_count++;
|
|
|
|
if (mi->sample_deferred > 0)
|
|
mi->sample_deferred--;
|
|
|
|
if (time_after(jiffies, mi->stats_update +
|
|
(mp->update_interval * HZ) / 1000))
|
|
minstrel_update_stats(mp, mi);
|
|
}
|
|
|
|
|
|
static inline unsigned int
|
|
minstrel_get_retry_count(struct minstrel_rate *mr,
|
|
struct ieee80211_tx_info *info)
|
|
{
|
|
unsigned int retry = mr->adjusted_retry_count;
|
|
|
|
if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
|
|
retry = max(2U, min(mr->retry_count_rtscts, retry));
|
|
else if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
|
|
retry = max(2U, min(mr->retry_count_cts, retry));
|
|
return retry;
|
|
}
|
|
|
|
|
|
static int
|
|
minstrel_get_next_sample(struct minstrel_sta_info *mi)
|
|
{
|
|
unsigned int sample_ndx;
|
|
sample_ndx = SAMPLE_TBL(mi, mi->sample_idx, mi->sample_column);
|
|
mi->sample_idx++;
|
|
if ((int) mi->sample_idx > (mi->n_rates - 2)) {
|
|
mi->sample_idx = 0;
|
|
mi->sample_column++;
|
|
if (mi->sample_column >= SAMPLE_COLUMNS)
|
|
mi->sample_column = 0;
|
|
}
|
|
return sample_ndx;
|
|
}
|
|
|
|
static void
|
|
minstrel_get_rate(void *priv, struct ieee80211_sta *sta,
|
|
void *priv_sta, struct ieee80211_tx_rate_control *txrc)
|
|
{
|
|
struct sk_buff *skb = txrc->skb;
|
|
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
|
|
struct minstrel_sta_info *mi = priv_sta;
|
|
struct minstrel_priv *mp = priv;
|
|
struct ieee80211_tx_rate *ar = info->control.rates;
|
|
unsigned int ndx, sample_ndx = 0;
|
|
bool mrr;
|
|
bool sample_slower = false;
|
|
bool sample = false;
|
|
int i, delta;
|
|
int mrr_ndx[3];
|
|
int sample_rate;
|
|
|
|
if (rate_control_send_low(sta, priv_sta, txrc))
|
|
return;
|
|
|
|
mrr = mp->has_mrr && !txrc->rts && !txrc->bss_conf->use_cts_prot;
|
|
|
|
ndx = mi->max_tp_rate;
|
|
|
|
if (mrr)
|
|
sample_rate = mp->lookaround_rate_mrr;
|
|
else
|
|
sample_rate = mp->lookaround_rate;
|
|
|
|
mi->packet_count++;
|
|
delta = (mi->packet_count * sample_rate / 100) -
|
|
(mi->sample_count + mi->sample_deferred / 2);
|
|
|
|
/* delta > 0: sampling required */
|
|
if ((delta > 0) && (mrr || !mi->prev_sample)) {
|
|
struct minstrel_rate *msr;
|
|
if (mi->packet_count >= 10000) {
|
|
mi->sample_deferred = 0;
|
|
mi->sample_count = 0;
|
|
mi->packet_count = 0;
|
|
} else if (delta > mi->n_rates * 2) {
|
|
/* With multi-rate retry, not every planned sample
|
|
* attempt actually gets used, due to the way the retry
|
|
* chain is set up - [max_tp,sample,prob,lowest] for
|
|
* sample_rate < max_tp.
|
|
*
|
|
* If there's too much sampling backlog and the link
|
|
* starts getting worse, minstrel would start bursting
|
|
* out lots of sampling frames, which would result
|
|
* in a large throughput loss. */
|
|
mi->sample_count += (delta - mi->n_rates * 2);
|
|
}
|
|
|
|
sample_ndx = minstrel_get_next_sample(mi);
|
|
msr = &mi->r[sample_ndx];
|
|
sample = true;
|
|
sample_slower = mrr && (msr->perfect_tx_time >
|
|
mi->r[ndx].perfect_tx_time);
|
|
|
|
if (!sample_slower) {
|
|
if (msr->sample_limit != 0) {
|
|
ndx = sample_ndx;
|
|
mi->sample_count++;
|
|
if (msr->sample_limit > 0)
|
|
msr->sample_limit--;
|
|
} else {
|
|
sample = false;
|
|
}
|
|
} else {
|
|
/* Only use IEEE80211_TX_CTL_RATE_CTRL_PROBE to mark
|
|
* packets that have the sampling rate deferred to the
|
|
* second MRR stage. Increase the sample counter only
|
|
* if the deferred sample rate was actually used.
|
|
* Use the sample_deferred counter to make sure that
|
|
* the sampling is not done in large bursts */
|
|
info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
|
|
mi->sample_deferred++;
|
|
}
|
|
}
|
|
mi->prev_sample = sample;
|
|
|
|
/* If we're not using MRR and the sampling rate already
|
|
* has a probability of >95%, we shouldn't be attempting
|
|
* to use it, as this only wastes precious airtime */
|
|
if (!mrr && sample && (mi->r[ndx].probability > 17100))
|
|
ndx = mi->max_tp_rate;
|
|
|
|
ar[0].idx = mi->r[ndx].rix;
|
|
ar[0].count = minstrel_get_retry_count(&mi->r[ndx], info);
|
|
|
|
if (!mrr) {
|
|
if (!sample)
|
|
ar[0].count = mp->max_retry;
|
|
ar[1].idx = mi->lowest_rix;
|
|
ar[1].count = mp->max_retry;
|
|
return;
|
|
}
|
|
|
|
/* MRR setup */
|
|
if (sample) {
|
|
if (sample_slower)
|
|
mrr_ndx[0] = sample_ndx;
|
|
else
|
|
mrr_ndx[0] = mi->max_tp_rate;
|
|
} else {
|
|
mrr_ndx[0] = mi->max_tp_rate2;
|
|
}
|
|
mrr_ndx[1] = mi->max_prob_rate;
|
|
mrr_ndx[2] = 0;
|
|
for (i = 1; i < 4; i++) {
|
|
ar[i].idx = mi->r[mrr_ndx[i - 1]].rix;
|
|
ar[i].count = mi->r[mrr_ndx[i - 1]].adjusted_retry_count;
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
calc_rate_durations(enum ieee80211_band band,
|
|
struct minstrel_rate *d,
|
|
struct ieee80211_rate *rate)
|
|
{
|
|
int erp = !!(rate->flags & IEEE80211_RATE_ERP_G);
|
|
|
|
d->perfect_tx_time = ieee80211_frame_duration(band, 1200,
|
|
rate->bitrate, erp, 1);
|
|
d->ack_time = ieee80211_frame_duration(band, 10,
|
|
rate->bitrate, erp, 1);
|
|
}
|
|
|
|
static void
|
|
init_sample_table(struct minstrel_sta_info *mi)
|
|
{
|
|
unsigned int i, col, new_idx;
|
|
unsigned int n_srates = mi->n_rates - 1;
|
|
u8 rnd[8];
|
|
|
|
mi->sample_column = 0;
|
|
mi->sample_idx = 0;
|
|
memset(mi->sample_table, 0, SAMPLE_COLUMNS * mi->n_rates);
|
|
|
|
for (col = 0; col < SAMPLE_COLUMNS; col++) {
|
|
for (i = 0; i < n_srates; i++) {
|
|
get_random_bytes(rnd, sizeof(rnd));
|
|
new_idx = (i + rnd[i & 7]) % n_srates;
|
|
|
|
while (SAMPLE_TBL(mi, new_idx, col) != 0)
|
|
new_idx = (new_idx + 1) % n_srates;
|
|
|
|
/* Don't sample the slowest rate (i.e. slowest base
|
|
* rate). We must presume that the slowest rate works
|
|
* fine, or else other management frames will also be
|
|
* failing and the link will break */
|
|
SAMPLE_TBL(mi, new_idx, col) = i + 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
minstrel_rate_init(void *priv, struct ieee80211_supported_band *sband,
|
|
struct ieee80211_sta *sta, void *priv_sta)
|
|
{
|
|
struct minstrel_sta_info *mi = priv_sta;
|
|
struct minstrel_priv *mp = priv;
|
|
struct ieee80211_rate *ctl_rate;
|
|
unsigned int i, n = 0;
|
|
unsigned int t_slot = 9; /* FIXME: get real slot time */
|
|
|
|
mi->lowest_rix = rate_lowest_index(sband, sta);
|
|
ctl_rate = &sband->bitrates[mi->lowest_rix];
|
|
mi->sp_ack_dur = ieee80211_frame_duration(sband->band, 10,
|
|
ctl_rate->bitrate,
|
|
!!(ctl_rate->flags & IEEE80211_RATE_ERP_G), 1);
|
|
|
|
for (i = 0; i < sband->n_bitrates; i++) {
|
|
struct minstrel_rate *mr = &mi->r[n];
|
|
unsigned int tx_time = 0, tx_time_cts = 0, tx_time_rtscts = 0;
|
|
unsigned int tx_time_single;
|
|
unsigned int cw = mp->cw_min;
|
|
|
|
if (!rate_supported(sta, sband->band, i))
|
|
continue;
|
|
n++;
|
|
memset(mr, 0, sizeof(*mr));
|
|
|
|
mr->rix = i;
|
|
mr->bitrate = sband->bitrates[i].bitrate / 5;
|
|
calc_rate_durations(sband->band, mr, &sband->bitrates[i]);
|
|
|
|
/* calculate maximum number of retransmissions before
|
|
* fallback (based on maximum segment size) */
|
|
mr->sample_limit = -1;
|
|
mr->retry_count = 1;
|
|
mr->retry_count_cts = 1;
|
|
mr->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) &&
|
|
(mr->retry_count_rtscts < mp->max_retry))
|
|
mr->retry_count_rtscts++;
|
|
} while ((tx_time < mp->segment_size) &&
|
|
(++mr->retry_count < mp->max_retry));
|
|
mr->adjusted_retry_count = mr->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);
|
|
}
|
|
|
|
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;
|
|
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;
|
|
|
|
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;
|
|
|
|
/* moving average weight for EWMA */
|
|
mp->ewma_level = 75;
|
|
|
|
/* 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);
|
|
}
|
|
|
|
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
|
|
};
|
|
|
|
int __init
|
|
rc80211_minstrel_init(void)
|
|
{
|
|
return ieee80211_rate_control_register(&mac80211_minstrel);
|
|
}
|
|
|
|
void
|
|
rc80211_minstrel_exit(void)
|
|
{
|
|
ieee80211_rate_control_unregister(&mac80211_minstrel);
|
|
}
|
|
|