* Copyright 2002-2005, Instant802 Networks, Inc.
* Copyright 2005, Devicescape Software, Inc.
* Copyright 2007, Mattias Nissler <mattias.nissler@gmx.de>
- * Copyright 2007, Stefano Brivio <stefano.brivio@polimi.it>
+ * Copyright 2007-2008, Stefano Brivio <stefano.brivio@polimi.it>
*
* 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
#include <linux/skbuff.h>
#include <linux/debugfs.h>
#include <net/mac80211.h>
-#include "ieee80211_rate.h"
-
+#include "rate.h"
+#include "mesh.h"
#include "rc80211_pid.h"
*/
-/* Shift the adjustment so that we won't switch to a lower rate if it exhibited
- * a worse failed frames behaviour and we'll choose the highest rate whose
- * failed frames behaviour is not worse than the one of the original rate
- * target. While at it, check that the adjustment is within the ranges. Then,
- * provide the new rate index. */
-static int rate_control_pid_shift_adjust(struct rc_pid_rateinfo *r,
- int adj, int cur, int l)
-{
- int i, j, k, tmp;
-
- j = r[cur].rev_index;
- i = j + adj;
-
- if (i < 0)
- return r[0].index;
- if (i >= l - 1)
- return r[l - 1].index;
-
- tmp = i;
-
- if (adj < 0) {
- for (k = j; k >= i; k--)
- if (r[k].diff <= r[j].diff)
- tmp = k;
- } else {
- for (k = i + 1; k + i < l; k++)
- if (r[k].diff <= r[i].diff)
- tmp = k;
- }
-
- return r[tmp].index;
-}
-
+/* Adjust the rate while ensuring that we won't switch to a lower rate if it
+ * exhibited a worse failed frames behaviour and we'll choose the highest rate
+ * whose failed frames behaviour is not worse than the one of the original rate
+ * target. While at it, check that the new rate is valid. */
static void rate_control_pid_adjust_rate(struct ieee80211_local *local,
struct sta_info *sta, int adj,
struct rc_pid_rateinfo *rinfo)
{
struct ieee80211_sub_if_data *sdata;
- struct ieee80211_hw_mode *mode;
- int newidx;
- int maxrate;
- int back = (adj > 0) ? 1 : -1;
+ struct ieee80211_supported_band *sband;
+ int cur_sorted, new_sorted, probe, tmp, n_bitrates, band;
+ int cur = sta->txrate_idx;
- sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
+ sdata = sta->sdata;
+ sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
+ band = sband->band;
+ n_bitrates = sband->n_bitrates;
- mode = local->oper_hw_mode;
- maxrate = sdata->bss ? sdata->bss->max_ratectrl_rateidx : -1;
+ /* Map passed arguments to sorted values. */
+ cur_sorted = rinfo[cur].rev_index;
+ new_sorted = cur_sorted + adj;
- newidx = rate_control_pid_shift_adjust(rinfo, adj, sta->txrate,
- mode->num_rates);
+ /* Check limits. */
+ if (new_sorted < 0)
+ new_sorted = rinfo[0].rev_index;
+ else if (new_sorted >= n_bitrates)
+ new_sorted = rinfo[n_bitrates - 1].rev_index;
- while (newidx != sta->txrate) {
- if (rate_supported(sta, mode, newidx) &&
- (maxrate < 0 || newidx <= maxrate)) {
- sta->txrate = newidx;
- break;
- }
+ tmp = new_sorted;
- newidx += back;
+ if (adj < 0) {
+ /* Ensure that the rate decrease isn't disadvantageous. */
+ for (probe = cur_sorted; probe >= new_sorted; probe--)
+ if (rinfo[probe].diff <= rinfo[cur_sorted].diff &&
+ rate_supported(sta, band, rinfo[probe].index))
+ tmp = probe;
+ } else {
+ /* Look for rate increase with zero (or below) cost. */
+ for (probe = new_sorted + 1; probe < n_bitrates; probe++)
+ if (rinfo[probe].diff <= rinfo[new_sorted].diff &&
+ rate_supported(sta, band, rinfo[probe].index))
+ tmp = probe;
}
+ /* Fit the rate found to the nearest supported rate. */
+ do {
+ if (rate_supported(sta, band, rinfo[tmp].index)) {
+ sta->txrate_idx = rinfo[tmp].index;
+ break;
+ }
+ if (adj < 0)
+ tmp--;
+ else
+ tmp++;
+ } while (tmp < n_bitrates && tmp >= 0);
+
#ifdef CONFIG_MAC80211_DEBUGFS
rate_control_pid_event_rate_change(
&((struct rc_pid_sta_info *)sta->rate_ctrl_priv)->events,
- newidx, mode->rates[newidx].rate);
+ sta->txrate_idx, sband->bitrates[sta->txrate_idx].bitrate);
#endif
}
struct ieee80211_local *local,
struct sta_info *sta)
{
+#ifdef CONFIG_MAC80211_MESH
+ struct ieee80211_sub_if_data *sdata = sta->sdata;
+#endif
struct rc_pid_sta_info *spinfo = sta->rate_ctrl_priv;
struct rc_pid_rateinfo *rinfo = pinfo->rinfo;
- struct ieee80211_hw_mode *mode;
+ struct ieee80211_supported_band *sband;
u32 pf;
s32 err_avg;
u32 err_prop;
int adj, i, j, tmp;
unsigned long period;
- mode = local->oper_hw_mode;
+ sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
spinfo = sta->rate_ctrl_priv;
/* In case nothing happened during the previous control interval, turn
pf = spinfo->last_pf;
else {
pf = spinfo->tx_num_failed * 100 / spinfo->tx_num_xmit;
+#ifdef CONFIG_MAC80211_MESH
+ if (pf == 100 &&
+ sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT)
+ mesh_plink_broken(sta);
+#endif
pf <<= RC_PID_ARITH_SHIFT;
+ sta->fail_avg = ((pf + (spinfo->last_pf << 3)) / 9)
+ >> RC_PID_ARITH_SHIFT;
}
spinfo->tx_num_xmit = 0;
spinfo->tx_num_failed = 0;
/* If we just switched rate, update the rate behaviour info. */
- if (pinfo->oldrate != sta->txrate) {
+ if (pinfo->oldrate != sta->txrate_idx) {
i = rinfo[pinfo->oldrate].rev_index;
- j = rinfo[sta->txrate].rev_index;
+ j = rinfo[sta->txrate_idx].rev_index;
tmp = (pf - spinfo->last_pf);
tmp = RC_PID_DO_ARITH_RIGHT_SHIFT(tmp, RC_PID_ARITH_SHIFT);
rinfo[j].diff = rinfo[i].diff + tmp;
- pinfo->oldrate = sta->txrate;
+ pinfo->oldrate = sta->txrate_idx;
}
- rate_control_pid_normalize(pinfo, mode->num_rates);
+ rate_control_pid_normalize(pinfo, sband->n_bitrates);
/* Compute the proportional, integral and derivative errors. */
err_prop = (pinfo->target << RC_PID_ARITH_SHIFT) - pf;
struct sta_info *sta;
struct rc_pid_sta_info *spinfo;
unsigned long period;
+ struct ieee80211_supported_band *sband;
+
+ rcu_read_lock();
sta = sta_info_get(local, hdr->addr1);
+ sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
if (!sta)
- return;
+ goto unlock;
/* Don't update the state if we're not controlling the rate. */
- sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
+ sdata = sta->sdata;
if (sdata->bss && sdata->bss->force_unicast_rateidx > -1) {
- sta->txrate = sdata->bss->max_ratectrl_rateidx;
- return;
+ sta->txrate_idx = sdata->bss->max_ratectrl_rateidx;
+ goto unlock;
}
/* Ignore all frames that were sent with a different rate than the rate
* we currently advise mac80211 to use. */
- if (status->control.rate != &local->oper_hw_mode->rates[sta->txrate])
- goto ignore;
+ if (status->control.tx_rate != &sband->bitrates[sta->txrate_idx])
+ goto unlock;
spinfo = sta->rate_ctrl_priv;
spinfo->tx_num_xmit++;
sta->tx_num_consecutive_failures++;
sta->tx_num_mpdu_fail++;
} else {
- sta->last_ack_rssi[0] = sta->last_ack_rssi[1];
- sta->last_ack_rssi[1] = sta->last_ack_rssi[2];
- sta->last_ack_rssi[2] = status->ack_signal;
sta->tx_num_consecutive_failures = 0;
sta->tx_num_mpdu_ok++;
}
if (time_after(jiffies, spinfo->last_sample + period))
rate_control_pid_sample(pinfo, local, sta);
-ignore:
- sta_info_put(sta);
+ unlock:
+ rcu_read_unlock();
}
static void rate_control_pid_get_rate(void *priv, struct net_device *dev,
- struct ieee80211_hw_mode *mode,
+ struct ieee80211_supported_band *sband,
struct sk_buff *skb,
struct rate_selection *sel)
{
int rateidx;
u16 fc;
+ rcu_read_lock();
+
sta = sta_info_get(local, hdr->addr1);
/* Send management frames and broadcast/multicast data using lowest
fc = le16_to_cpu(hdr->frame_control);
if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
is_multicast_ether_addr(hdr->addr1) || !sta) {
- sel->rate = rate_lowest(local, mode, sta);
- if (sta)
- sta_info_put(sta);
+ sel->rate = rate_lowest(local, sband, sta);
+ rcu_read_unlock();
return;
}
/* If a forced rate is in effect, select it. */
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
if (sdata->bss && sdata->bss->force_unicast_rateidx > -1)
- sta->txrate = sdata->bss->force_unicast_rateidx;
+ sta->txrate_idx = sdata->bss->force_unicast_rateidx;
- rateidx = sta->txrate;
+ rateidx = sta->txrate_idx;
- if (rateidx >= mode->num_rates)
- rateidx = mode->num_rates - 1;
+ if (rateidx >= sband->n_bitrates)
+ rateidx = sband->n_bitrates - 1;
- sta->last_txrate = rateidx;
+ sta->last_txrate_idx = rateidx;
- sta_info_put(sta);
+ rcu_read_unlock();
- sel->rate = &mode->rates[rateidx];
+ sel->rate = &sband->bitrates[rateidx];
#ifdef CONFIG_MAC80211_DEBUGFS
rate_control_pid_event_tx_rate(
&((struct rc_pid_sta_info *) sta->rate_ctrl_priv)->events,
- rateidx, mode->rates[rateidx].rate);
+ rateidx, sband->bitrates[rateidx].bitrate);
#endif
}
* as we need to have IEEE 802.1X auth succeed immediately after assoc..
* Until that method is implemented, we will use the lowest supported
* rate as a workaround. */
- sta->txrate = rate_lowest_index(local, local->oper_hw_mode, sta);
+ struct ieee80211_supported_band *sband;
+
+ sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
+ sta->txrate_idx = rate_lowest_index(local, sband, sta);
+ sta->fail_avg = 0;
}
static void *rate_control_pid_alloc(struct ieee80211_local *local)
{
struct rc_pid_info *pinfo;
struct rc_pid_rateinfo *rinfo;
- struct ieee80211_hw_mode *mode;
+ struct ieee80211_supported_band *sband;
int i, j, tmp;
bool s;
#ifdef CONFIG_MAC80211_DEBUGFS
struct rc_pid_debugfs_entries *de;
#endif
+ sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
+
pinfo = kmalloc(sizeof(*pinfo), GFP_ATOMIC);
if (!pinfo)
return NULL;
- /* We can safely assume that oper_hw_mode won't change unless we get
+ /* We can safely assume that sband won't change unless we get
* reinitialized. */
- mode = local->oper_hw_mode;
- rinfo = kmalloc(sizeof(*rinfo) * mode->num_rates, GFP_ATOMIC);
+ rinfo = kmalloc(sizeof(*rinfo) * sband->n_bitrates, GFP_ATOMIC);
if (!rinfo) {
kfree(pinfo);
return NULL;
}
+ pinfo->target = RC_PID_TARGET_PF;
+ pinfo->sampling_period = RC_PID_INTERVAL;
+ pinfo->coeff_p = RC_PID_COEFF_P;
+ pinfo->coeff_i = RC_PID_COEFF_I;
+ pinfo->coeff_d = RC_PID_COEFF_D;
+ pinfo->smoothing_shift = RC_PID_SMOOTHING_SHIFT;
+ pinfo->sharpen_factor = RC_PID_SHARPENING_FACTOR;
+ pinfo->sharpen_duration = RC_PID_SHARPENING_DURATION;
+ pinfo->norm_offset = RC_PID_NORM_OFFSET;
+ pinfo->rinfo = rinfo;
+ pinfo->oldrate = 0;
+
/* Sort the rates. This is optimized for the most common case (i.e.
* almost-sorted CCK+OFDM rates). Kind of bubble-sort with reversed
* mapping too. */
- for (i = 0; i < mode->num_rates; i++) {
+ for (i = 0; i < sband->n_bitrates; i++) {
rinfo[i].index = i;
rinfo[i].rev_index = i;
- if (pinfo->fast_start)
+ if (RC_PID_FAST_START)
rinfo[i].diff = 0;
else
rinfo[i].diff = i * pinfo->norm_offset;
}
- for (i = 1; i < mode->num_rates; i++) {
+ for (i = 1; i < sband->n_bitrates; i++) {
s = 0;
- for (j = 0; j < mode->num_rates - i; j++)
- if (unlikely(mode->rates[rinfo[j].index].rate >
- mode->rates[rinfo[j + 1].index].rate)) {
+ for (j = 0; j < sband->n_bitrates - i; j++)
+ if (unlikely(sband->bitrates[rinfo[j].index].bitrate >
+ sband->bitrates[rinfo[j + 1].index].bitrate)) {
tmp = rinfo[j].index;
rinfo[j].index = rinfo[j + 1].index;
rinfo[j + 1].index = tmp;
break;
}
- pinfo->target = RC_PID_TARGET_PF;
- pinfo->sampling_period = RC_PID_INTERVAL;
- pinfo->coeff_p = RC_PID_COEFF_P;
- pinfo->coeff_i = RC_PID_COEFF_I;
- pinfo->coeff_d = RC_PID_COEFF_D;
- pinfo->smoothing_shift = RC_PID_SMOOTHING_SHIFT;
- pinfo->sharpen_factor = RC_PID_SHARPENING_FACTOR;
- pinfo->sharpen_duration = RC_PID_SHARPENING_DURATION;
- pinfo->norm_offset = RC_PID_NORM_OFFSET;
- pinfo->fast_start = RC_PID_FAST_START;
- pinfo->rinfo = rinfo;
- pinfo->oldrate = 0;
-
#ifdef CONFIG_MAC80211_DEBUGFS
de = &pinfo->dentries;
de->dir = debugfs_create_dir("rc80211_pid",
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;
#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);
return ieee80211_rate_control_register(&mac80211_rcpid);
}
-void __exit rc80211_pid_exit(void)
+void rc80211_pid_exit(void)
{
ieee80211_rate_control_unregister(&mac80211_rcpid);
}