/******************************************************************************
*
* Copyright(c) 2005 - 2007 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
*
* The full GNU General Public License is included in this distribution in the
* file called LICENSE.
*
* Contact Information:
* James P. Ketrenos <ipw2100-admin@linux.intel.com>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*
*****************************************************************************/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/wireless.h>
#include <net/mac80211.h>
#include <net/ieee80211.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#define IWL 3945
#include "../net/mac80211/ieee80211_rate.h"
#include "iwlwifi.h"
#define RS_NAME "iwl-3945-rs"
struct iwl_rate_scale_data {
u64 data;
s32 success_counter;
s32 success_ratio;
s32 counter;
s32 average_tpt;
unsigned long stamp;
};
struct iwl_rate_scale_priv {
spinlock_t lock;
s32 *expected_tpt;
unsigned long last_partial_flush;
unsigned long last_flush;
u32 flush_time;
u32 last_tx_packets;
u32 tx_packets;
u8 tgg;
u8 flush_pending;
u8 start_rate;
u8 ibss_sta_added;
struct timer_list rate_scale_flush;
struct iwl_rate_scale_data win[IWL_RATE_COUNT];
};
static s32 iwl_expected_tpt_g[IWL_RATE_COUNT] = {
7, 13, 35, 58, 0, 0, 76, 104, 130, 168, 191, 202
};
static s32 iwl_expected_tpt_g_prot[IWL_RATE_COUNT] = {
7, 13, 35, 58, 0, 0, 0, 80, 93, 113, 123, 125
};
static s32 iwl_expected_tpt_a[IWL_RATE_COUNT] = {
0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186
};
static s32 iwl_expected_tpt_b[IWL_RATE_COUNT] = {
7, 13, 35, 58, 0, 0, 0, 0, 0, 0, 0, 0
};
struct iwl_tpt_entry {
s8 min_rssi;
u8 index;
};
static struct iwl_tpt_entry iwl_tpt_table_a[] = {
{-60, IWL_RATE_54M_INDEX},
{-64, IWL_RATE_48M_INDEX},
{-72, IWL_RATE_36M_INDEX},
{-80, IWL_RATE_24M_INDEX},
{-84, IWL_RATE_18M_INDEX},
{-85, IWL_RATE_12M_INDEX},
{-87, IWL_RATE_9M_INDEX},
{-89, IWL_RATE_6M_INDEX}
};
static struct iwl_tpt_entry iwl_tpt_table_b[] = {
{-86, IWL_RATE_11M_INDEX},
{-88, IWL_RATE_5M_INDEX},
{-90, IWL_RATE_2M_INDEX},
{-92, IWL_RATE_1M_INDEX}
};
static struct iwl_tpt_entry iwl_tpt_table_g[] = {
{-60, IWL_RATE_54M_INDEX},
{-64, IWL_RATE_48M_INDEX},
{-68, IWL_RATE_36M_INDEX},
{-80, IWL_RATE_24M_INDEX},
{-84, IWL_RATE_18M_INDEX},
{-85, IWL_RATE_12M_INDEX},
{-86, IWL_RATE_11M_INDEX},
{-88, IWL_RATE_5M_INDEX},
{-90, IWL_RATE_2M_INDEX},
{-92, IWL_RATE_1M_INDEX}
};
#define IWL_RATE_MAX_WINDOW 62
#define IWL_RATE_FLUSH (3*HZ/10)
#define IWL_RATE_WIN_FLUSH (HZ/2)
#define IWL_RATE_HIGH_TH 11520
#define IWL_RATE_MIN_FAILURE_TH 8
#define IWL_RATE_MIN_SUCCESS_TH 8
#define IWL_RATE_DECREASE_TH 1920
static u8 iwl_get_rate_index_by_rssi(s32 rssi, u8 mode)
{
u32 index = 0;
u32 table_size = 0;
struct iwl_tpt_entry *tpt_table = NULL;
if ((rssi < IWL_MIN_RSSI_VAL) || (rssi > IWL_MAX_RSSI_VAL))
rssi = IWL_MIN_RSSI_VAL;
switch (mode) {
case MODE_IEEE80211G:
tpt_table = iwl_tpt_table_g;
table_size = ARRAY_SIZE(iwl_tpt_table_g);
break;
case MODE_IEEE80211A:
tpt_table = iwl_tpt_table_a;
table_size = ARRAY_SIZE(iwl_tpt_table_a);
break;
default:
case MODE_IEEE80211B:
tpt_table = iwl_tpt_table_b;
table_size = ARRAY_SIZE(iwl_tpt_table_b);
break;
}
while ((index < table_size) && (rssi < tpt_table[index].min_rssi))
index++;
index = min(index, (table_size - 1));
return tpt_table[index].index;
}
static void iwl_clear_window(struct iwl_rate_scale_data *window)
{
window->data = 0;
window->success_counter = 0;
window->success_ratio = IWL_INVALID_VALUE;
window->counter = 0;
window->average_tpt = IWL_INVALID_VALUE;
window->stamp = 0;
}
/**
* iwl_rate_scale_flush_windows - flush out the rate scale windows
*
* Returns the number of windows that have gathered data but were
* not flushed. If there were any that were not flushed, then
* reschedule the rate flushing routine.
*/
static int iwl_rate_scale_flush_windows(struct iwl_rate_scale_priv *rs_priv)
{
int unflushed = 0;
int i;
unsigned long flags;
/*
* For each rate, if we have collected data on that rate
* and it has been more than IWL_RATE_WIN_FLUSH
* since we flushed, clear out the gathered statistics
*/
for (i = 0; i < IWL_RATE_COUNT; i++) {
if (!rs_priv->win[i].counter)
continue;
spin_lock_irqsave(&rs_priv->lock, flags);
if (time_after(jiffies, rs_priv->win[i].stamp +
IWL_RATE_WIN_FLUSH)) {
IWL_DEBUG_RATE("flushing %d samples of rate "
"index %d\n",
rs_priv->win[i].counter, i);
iwl_clear_window(&rs_priv->win[i]);
} else
unflushed++;
spin_unlock_irqrestore(&rs_priv->lock, flags);
}
return unflushed;
}
#define IWL_RATE_FLUSH_MAX 5000 /* msec */
#define IWL_RATE_FLUSH_MIN 50 /* msec */
static void iwl_bg_rate_scale_flush(unsigned long data)
{
struct iwl_rate_scale_priv *rs_priv = (void *)data;
int unflushed = 0;
unsigned long flags;
u32 packet_count, duration, pps;
IWL_DEBUG_RATE("enter\n");
unflushed = iwl_rate_scale_flush_windows(rs_priv);
spin_lock_irqsave(&rs_priv->lock, flags);
rs_priv->flush_pending = 0;
/* Number of packets Rx'd since last time this timer ran */
packet_count = (rs_priv->tx_packets - rs_priv->last_tx_packets) + 1;
rs_priv->last_tx_packets = rs_priv->tx_packets + 1;
if (unflushed) {
duration =
jiffies_to_msecs(jiffies - rs_priv->last_partial_flush);
/* duration = jiffies_to_msecs(rs_priv->flush_time); */
IWL_DEBUG_RATE("Tx'd %d packets in %dms\n",
packet_count, duration);
/* Determine packets per second */
if (duration)
pps = (packet_count * 1000) / duration;
else
pps = 0;
if (pps) {
duration = IWL_RATE_FLUSH_MAX / pps;
if (duration < IWL_RATE_FLUSH_MIN)
duration = IWL_RATE_FLUSH_MIN;
} else
duration = IWL_RATE_FLUSH_MAX;
rs_priv->flush_time = msecs_to_jiffies(duration);
IWL_DEBUG_RATE("new flush period: %d msec ave %d\n",
duration, packet_count);
mod_timer(&rs_priv->rate_scale_flush, jiffies +
rs_priv->flush_time);
rs_priv->last_partial_flush = jiffies;
}
/* If there weren't any unflushed entries, we don't schedule the timer
* to run again */
rs_priv->last_flush = jiffies;
spin_unlock_irqrestore(&rs_priv->lock, flags);
IWL_DEBUG_RATE("leave\n");
}
/**
* iwl_collect_tx_data - Update the success/failure sliding window
*
* We keep a sliding window of the last 64 packets transmitted
* at this rate. window->data contains the bitmask of successful
* packets.
*/
static void iwl_collect_tx_data(struct iwl_rate_scale_priv *rs_priv,
struct iwl_rate_scale_data *window,
int success, int retries)
{
unsigned long flags;
if (!retries) {
IWL_DEBUG_RATE("leave: retries == 0 -- should be at least 1\n");
return;
}
while (retries--) {
spin_lock_irqsave(&rs_priv->lock, flags);
/* If we have filled up the window then subtract one from the
* success counter if the high-bit is counting toward
* success */
if (window->counter == IWL_RATE_MAX_WINDOW) {
if (window->data & (1ULL << (IWL_RATE_MAX_WINDOW - 1)))
window->success_counter--;
} else
window->counter++;
/* Slide the window to the left one bit */
window->data = (window->data << 1);
/* If this packet was a success then set the low bit high */
if (success) {
window->success_counter++;
window->data |= 1;
}
/* window->counter can't be 0 -- it is either >0 or
* IWL_RATE_MAX_WINDOW */
window->success_ratio = 12800 * window->success_counter /
window->counter;
/* Tag this window as having been updated */
window->stamp = jiffies;
spin_unlock_irqrestore(&rs_priv->lock, flags);
}
}
static void rs_rate_init(void *priv_rate, void *priv_sta,
struct ieee80211_local *local, struct sta_info *sta)
{
int i;
IWL_DEBUG_RATE("enter\n");
/* TODO: what is a good starting rate for STA? About middle? Maybe not
* the lowest or the highest rate.. Could consider using RSSI from
* previous packets? Need to have IEEE 802.1X auth succeed immediately
* after assoc.. */
for (i = IWL_RATE_COUNT - 1; i >= 0; i--) {
if (sta->supp_rates & (1 << i)) {
sta->txrate = i;
break;
}
}
sta->last_txrate = sta->txrate;
/* For MODE_IEEE80211A mode it start at IWL_FIRST_OFDM_RATE */
if (local->hw.conf.phymode == MODE_IEEE80211A)
sta->last_txrate += IWL_FIRST_OFDM_RATE;
IWL_DEBUG_RATE("leave\n");
}
static void *rs_alloc(struct ieee80211_local *local)
{
return local->hw.priv;
}
/* rate scale requires free function to be implmented */
static void rs_free(void *priv)
{
return;
}
static void rs_clear(void *priv)
{
return;
}
static void *rs_alloc_sta(void *priv, gfp_t gfp)
{
struct iwl_rate_scale_priv *rs_priv;
int i;
IWL_DEBUG_RATE("enter\n");
rs_priv = kzalloc(sizeof(struct iwl_rate_scale_priv), gfp);
if (!rs_priv) {
IWL_DEBUG_RATE("leave: ENOMEM\n");
return NULL;
}
spin_lock_init(&rs_priv->lock);
rs_priv->start_rate = IWL_RATE_INVALID;
/* default to just 802.11b */
rs_priv->expected_tpt = iwl_expected_tpt_b;
rs_priv->last_partial_flush = jiffies;
rs_priv->last_flush = jiffies;
rs_priv->flush_time = IWL_RATE_FLUSH;
rs_priv->last_tx_packets = 0;
rs_priv->ibss_sta_added = 0;
init_timer(&rs_priv->rate_scale_flush);
rs_priv->rate_scale_flush.data = (unsigned long)rs_priv;
rs_priv->rate_scale_flush.function = &iwl_bg_rate_scale_flush;
for (i = 0; i < IWL_RATE_COUNT; i++)
iwl_clear_window(&rs_priv->win[i]);
IWL_DEBUG_RATE("leave\n");
return rs_priv;
}
static void rs_free_sta(void *priv, void *priv_sta)
{
struct iwl_rate_scale_priv *rs_priv = priv_sta;
IWL_DEBUG_RATE("enter\n");
del_timer_sync(&rs_priv->rate_scale_flush);
kfree(rs_priv);
IWL_DEBUG_RATE("leave\n");
}
/*
* get ieee prev rate from rate scale table.
* for A and B mode we need to overright prev
* value
*/
static int rs_adjust_next_rate(struct iwl_priv *priv, int rate)
{
int next_rate = iwl_get_prev_ieee_rate(rate);
switch (priv->phymode) {
case MODE_IEEE80211A:
if (rate == IWL_RATE_12M_INDEX)
next_rate = IWL_RATE_9M_INDEX;
else if (rate == IWL_RATE_6M_INDEX)
next_rate = IWL_RATE_6M_INDEX;
break;
case MODE_IEEE80211B:
if (rate == IWL_RATE_11M_INDEX_TABLE)
next_rate = IWL_RATE_5M_INDEX_TABLE;
break;
default:
break;
}
return next_rate;
}
/**
* rs_tx_status - Update rate control values based on Tx results
*
* NOTE: Uses iwl_priv->retry_rate for the # of retries attempted by
* the hardware for each rate.
*/
static void rs_tx_status(void *priv_rate,
struct net_device *dev,
struct sk_buff *skb,
struct ieee80211_tx_status *tx_resp)
{
u8 retries, current_count;
int scale_rate_index, first_index, last_index;
unsigned long flags;
struct sta_info *sta;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct iwl_rate_scale_priv *rs_priv;
IWL_DEBUG_RATE("enter\n");
retries = tx_resp->retry_count;
first_index = tx_resp->control.tx_rate;
if ((first_index < 0) || (first_index >= IWL_RATE_COUNT)) {
IWL_DEBUG_RATE("leave: Rate out of bounds: %0x for %d\n",
tx_resp->control.tx_rate, first_index);
return;
}
sta = sta_info_get(local, hdr->addr1);
if (!sta || !sta->rate_ctrl_priv) {
if (sta)
sta_info_put(sta);
IWL_DEBUG_RATE("leave: No STA priv data to update!\n");
return;
}
rs_priv = (void *)sta->rate_ctrl_priv;
rs_priv->tx_packets++;
scale_rate_index = first_index;
last_index = first_index;
/*
* Update the window for each rate. We determine which rates
* were Tx'd based on the total number of retries vs. the number
* of retries configured for each rate -- currently set to the
* priv value 'retry_rate' vs. rate specific
*
* On exit from this while loop last_index indicates the rate
* at which the frame was finally transmitted (or failed if no
* ACK)
*/
while (retries > 0) {
if (retries < priv->retry_rate) {
current_count = retries;
last_index = scale_rate_index;
} else {
current_count = priv->retry_rate;
last_index = rs_adjust_next_rate(priv,
scale_rate_index);
}
/* Update this rate accounting for as many retries
* as was used for it (per current_count) */
iwl_collect_tx_data(rs_priv,
&rs_priv->win[scale_rate_index],
0, current_count);
IWL_DEBUG_RATE("Update rate %d for %d retries.\n",
scale_rate_index, current_count);
retries -= current_count;
if (retries)
scale_rate_index =
rs_adjust_next_rate(priv, scale_rate_index);
}
/* Update the last index window with success/failure based on ACK */
IWL_DEBUG_RATE("Update rate %d with %s.\n",
last_index,
(tx_resp->flags & IEEE80211_TX_STATUS_ACK) ?
"success" : "failure");
iwl_collect_tx_data(rs_priv,
&rs_priv->win[last_index],
tx_resp->flags & IEEE80211_TX_STATUS_ACK, 1);
/* We updated the rate scale window -- if its been more than
* flush_time since the last run, schedule the flush
* again */
spin_lock_irqsave(&rs_priv->lock, flags);
if (!rs_priv->flush_pending &&
time_after(jiffies, rs_priv->last_partial_flush +
rs_priv->flush_time)) {
rs_priv->flush_pending = 1;
mod_timer(&rs_priv->rate_scale_flush,
jiffies + rs_priv->flush_time);
}
spin_unlock_irqrestore(&rs_priv->lock, flags);
sta_info_put(sta);
IWL_DEBUG_RATE("leave\n");
return;
}
static struct ieee80211_rate *iwl_get_lowest_rate(struct ieee80211_local
*local)
{
struct ieee80211_hw_mode *mode = local->oper_hw_mode;
int i;
for (i = 0; i < mode->num_rates; i++) {
struct ieee80211_rate *rate = &mode->rates[i];
if (rate->flags & IEEE80211_RATE_SUPPORTED)
return rate;
}
return &mode->rates[0];
}
static u16 iwl_get_adjacent_rate(struct iwl_rate_scale_priv *rs_priv,
u8 index, u16 rate_mask, int phymode)
{
u8 high = IWL_RATE_INVALID;
u8 low = IWL_RATE_INVALID;
/* 802.11A walks to the next literal adjascent rate in
* the rate table */
if (unlikely(phymode == MODE_IEEE80211A)) {
int i;
u32 mask;
/* Find the previous rate that is in the rate mask */
i = index - 1;
for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
if (rate_mask & mask) {
low = i;
break;
}
}
/* Find the next rate that is in the rate mask */
i = index + 1;
for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
if (rate_mask & mask) {
high = i;
break;
}
}
return (high << 8) | low;
}
low = index;
while (low != IWL_RATE_INVALID) {
if (rs_priv->tgg)
low = iwl_rates[low].prev_rs_tgg;
else
low = iwl_rates[low].prev_rs;
if (low == IWL_RATE_INVALID)
break;
if (rate_mask & (1 << low))
break;
IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
}
high = index;
while (high != IWL_RATE_INVALID) {
if (rs_priv->tgg)
high = iwl_rates[high].next_rs_tgg;
else
high = iwl_rates[high].next_rs;
if (high == IWL_RATE_INVALID)
break;
if (rate_mask & (1 << high))
break;
IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
}
return (high << 8) | low;
}
/**
* rs_get_rate - find the rate for the requested packet
*
* Returns the ieee80211_rate structure allocated by the driver.
*
* The rate control algorithm has no internal mapping between hw_mode's
* rate ordering and the rate ordering used by the rate control algorithm.
*
* The rate control algorithm uses a single table of rates that goes across
* the entire A/B/G spectrum vs. being limited to just one particular
* hw_mode.
*
* As such, we can't convert the index obtained below into the hw_mode's
* rate table and must reference the driver allocated rate table
*
*/
static struct ieee80211_rate *rs_get_rate(void *priv_rate,
struct net_device *dev,
struct sk_buff *skb,
struct rate_control_extra *extra)
{
u8 low = IWL_RATE_INVALID;
u8 high = IWL_RATE_INVALID;
u16 high_low;
int index;
struct iwl_rate_scale_priv *rs_priv;
struct iwl_rate_scale_data *window = NULL;
int current_tpt = IWL_INVALID_VALUE;
int low_tpt = IWL_INVALID_VALUE;
int high_tpt = IWL_INVALID_VALUE;
u32 fail_count;
s8 scale_action = 0;
unsigned long flags;
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
struct sta_info *sta;
u16 fc, rate_mask;
struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
DECLARE_MAC_BUF(mac);
IWL_DEBUG_RATE("enter\n");
memset(extra, 0, sizeof(*extra));
fc = le16_to_cpu(hdr->frame_control);
if (((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA) ||
(is_multicast_ether_addr(hdr->addr1))) {
/* Send management frames and broadcast/multicast data using
* lowest rate. */
/* TODO: this could probably be improved.. */
IWL_DEBUG_RATE("leave: lowest rate (not data or is "
"multicast)\n");
return iwl_get_lowest_rate(local);
}
sta = sta_info_get(local, hdr->addr1);
if (!sta || !sta->rate_ctrl_priv) {
IWL_DEBUG_RATE("leave: No STA priv data to update!\n");
if (sta)
sta_info_put(sta);
return NULL;
}
rate_mask = sta->supp_rates;
index = min(sta->last_txrate & 0xffff, IWL_RATE_COUNT - 1);
if (priv->phymode == (u8) MODE_IEEE80211A)
rate_mask = rate_mask << IWL_FIRST_OFDM_RATE;
rs_priv = (void *)sta->rate_ctrl_priv;
if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
!rs_priv->ibss_sta_added) {
u8 sta_id = iwl_hw_find_station(priv, hdr->addr1);
if (sta_id == IWL_INVALID_STATION) {
IWL_DEBUG_RATE("LQ: ADD station %s\n",
print_mac(mac, hdr->addr1));
sta_id = iwl_add_station(priv,
hdr->addr1, 0, CMD_ASYNC);
}
if (sta_id != IWL_INVALID_STATION)
rs_priv->ibss_sta_added = 1;
}
spin_lock_irqsave(&rs_priv->lock, flags);
if (rs_priv->start_rate != IWL_RATE_INVALID) {
index = rs_priv->start_rate;
rs_priv->start_rate = IWL_RATE_INVALID;
}
window = &(rs_priv->win[index]);
fail_count = window->counter - window->success_counter;
if (((fail_count <= IWL_RATE_MIN_FAILURE_TH) &&
(window->success_counter < IWL_RATE_MIN_SUCCESS_TH))) {
window->average_tpt = IWL_INVALID_VALUE;
spin_unlock_irqrestore(&rs_priv->lock, flags);
IWL_DEBUG_RATE("Invalid average_tpt on rate %d: "
"counter: %d, success_counter: %d, "
"expected_tpt is %sNULL\n",
index,
window->counter,
window->success_counter,
rs_priv->expected_tpt ? "not " : "");
goto out;
}
window->average_tpt = ((window->success_ratio *
rs_priv->expected_tpt[index] + 64) / 128);
current_tpt = window->average_tpt;
high_low = iwl_get_adjacent_rate(rs_priv, index, rate_mask,
local->hw.conf.phymode);
low = high_low & 0xff;
high = (high_low >> 8) & 0xff;
if (low != IWL_RATE_INVALID)
low_tpt = rs_priv->win[low].average_tpt;
if (high != IWL_RATE_INVALID)
high_tpt = rs_priv->win[high].average_tpt;
spin_unlock_irqrestore(&rs_priv->lock, flags);
scale_action = 1;
if ((window->success_ratio < IWL_RATE_DECREASE_TH) || !current_tpt) {
IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
scale_action = -1;
} else if ((low_tpt == IWL_INVALID_VALUE) &&
(high_tpt == IWL_INVALID_VALUE))
scale_action = 1;
else if ((low_tpt != IWL_INVALID_VALUE) &&
(high_tpt != IWL_INVALID_VALUE)
&& (low_tpt < current_tpt)
&& (high_tpt < current_tpt)) {
IWL_DEBUG_RATE("No action -- low [%d] & high [%d] < "
"current_tpt [%d]\n",
low_tpt, high_tpt, current_tpt);
scale_action = 0;
} else {
if (high_tpt != IWL_INVALID_VALUE) {
if (high_tpt > current_tpt)
scale_action = 1;
else {
IWL_DEBUG_RATE
("decrease rate because of high tpt\n");
scale_action = -1;
}
} else if (low_tpt != IWL_INVALID_VALUE) {
if (low_tpt > current_tpt) {
IWL_DEBUG_RATE
("decrease rate because of low tpt\n");
scale_action = -1;
} else
scale_action = 1;
}
}
if ((window->success_ratio > IWL_RATE_HIGH_TH) ||
(current_tpt > window->average_tpt)) {
IWL_DEBUG_RATE("No action -- success_ratio [%d] > HIGH_TH or "
"current_tpt [%d] > average_tpt [%d]\n",
window->success_ratio,
current_tpt, window->average_tpt);
scale_action = 0;
}
switch (scale_action) {
case -1:
if (low != IWL_RATE_INVALID)
index = low;
break;
case 1:
if (high != IWL_RATE_INVALID)
index = high;
break;
case 0:
default:
break;
}
IWL_DEBUG_RATE("Selected %d (action %d) - low %d high %d\n",
index, scale_action, low, high);
out:
sta->last_txrate = index;
if (priv->phymode == (u8) MODE_IEEE80211A)
sta->txrate = sta->last_txrate - IWL_FIRST_OFDM_RATE;
else
sta->txrate = sta->last_txrate;
sta_info_put(sta);
IWL_DEBUG_RATE("leave: %d\n", index);
return &priv->ieee_rates[index];
}
static struct rate_control_ops rs_ops = {
.module = NULL,
.name = RS_NAME,
.tx_status = rs_tx_status,
.get_rate = rs_get_rate,
.rate_init = rs_rate_init,
.clear = rs_clear,
.alloc = rs_alloc,
.free = rs_free,
.alloc_sta = rs_alloc_sta,
.free_sta = rs_free_sta,
};
int iwl_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
{
struct ieee80211_local *local = hw_to_local(hw);
struct iwl_priv *priv = hw->priv;
struct iwl_rate_scale_priv *rs_priv;
struct sta_info *sta;
unsigned long flags;
int count = 0, i;
u32 samples = 0, success = 0, good = 0;
unsigned long now = jiffies;
u32 max_time = 0;
sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
if (!sta || !sta->rate_ctrl_priv) {
if (sta) {
sta_info_put(sta);
IWL_DEBUG_RATE("leave - no private rate data!\n");
} else
IWL_DEBUG_RATE("leave - no station!\n");
return sprintf(buf, "station %d not found\n", sta_id);
}
rs_priv = (void *)sta->rate_ctrl_priv;
spin_lock_irqsave(&rs_priv->lock, flags);
i = IWL_RATE_54M_INDEX;
while (1) {
u64 mask;
int j;
count +=
sprintf(&buf[count], " %2dMbs: ", iwl_rates[i].ieee / 2);
mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
buf[count++] =
(rs_priv->win[i].data & mask) ? '1' : '0';
samples += rs_priv->win[i].counter;
good += rs_priv->win[i].success_counter;
success += rs_priv->win[i].success_counter * iwl_rates[i].ieee;
if (rs_priv->win[i].stamp) {
int delta =
jiffies_to_msecs(now - rs_priv->win[i].stamp);
if (delta > max_time)
max_time = delta;
count += sprintf(&buf[count], "%5dms\n", delta);
} else
buf[count++] = '\n';
j = iwl_get_prev_ieee_rate(i);
if (j == i)
break;
i = j;
}
spin_unlock_irqrestore(&rs_priv->lock, flags);
sta_info_put(sta);
/* Display the average rate of all samples taken.
*
* NOTE: We multiple # of samples by 2 since the IEEE measurement
* added from iwl_rates is actually 2X the rate */
if (samples)
count += sprintf(
&buf[count],
"\nAverage rate is %3d.%02dMbs over last %4dms\n"
"%3d%% success (%d good packets over %d tries)\n",
success / (2 * samples), (success * 5 / samples) % 10,
max_time, good * 100 / samples, good, samples);
else
count += sprintf(&buf[count], "\nAverage rate: 0Mbs\n");
return count;
}
void iwl_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
{
struct iwl_priv *priv = hw->priv;
s32 rssi = 0;
unsigned long flags;
struct ieee80211_local *local = hw_to_local(hw);
struct iwl_rate_scale_priv *rs_priv;
struct sta_info *sta;
IWL_DEBUG_RATE("enter\n");
if (!local->rate_ctrl->ops->name ||
strcmp(local->rate_ctrl->ops->name, RS_NAME)) {
IWL_WARNING("iwl-3945-rs not selected as rate control algo!\n");
IWL_DEBUG_RATE("leave - mac80211 picked the wrong RC algo.\n");
return;
}
sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
if (!sta || !sta->rate_ctrl_priv) {
if (sta)
sta_info_put(sta);
IWL_DEBUG_RATE("leave - no private rate data!\n");
return;
}
rs_priv = (void *)sta->rate_ctrl_priv;
spin_lock_irqsave(&rs_priv->lock, flags);
rs_priv->tgg = 0;
switch (priv->phymode) {
case MODE_IEEE80211G:
if (priv->active_rxon.flags & RXON_FLG_TGG_PROTECT_MSK) {
rs_priv->tgg = 1;
rs_priv->expected_tpt = iwl_expected_tpt_g_prot;
} else
rs_priv->expected_tpt = iwl_expected_tpt_g;
break;
case MODE_IEEE80211A:
rs_priv->expected_tpt = iwl_expected_tpt_a;
break;
default:
IWL_WARNING("Invalid phymode. Defaulting to 802.11b\n");
case MODE_IEEE80211B:
rs_priv->expected_tpt = iwl_expected_tpt_b;
break;
}
sta_info_put(sta);
spin_unlock_irqrestore(&rs_priv->lock, flags);
rssi = priv->last_rx_rssi;
if (rssi == 0)
rssi = IWL_MIN_RSSI_VAL;
IWL_DEBUG(IWL_DL_INFO | IWL_DL_RATE, "Network RSSI: %d\n", rssi);
rs_priv->start_rate = iwl_get_rate_index_by_rssi(rssi, priv->phymode);
IWL_DEBUG_RATE("leave: rssi %d assign rate index: "
"%d (plcp 0x%x)\n", rssi, rs_priv->start_rate,
iwl_rates[rs_priv->start_rate].plcp);
}
void iwl_rate_control_register(struct ieee80211_hw *hw)
{
ieee80211_rate_control_register(&rs_ops);
}
void iwl_rate_control_unregister(struct ieee80211_hw *hw)
{
ieee80211_rate_control_unregister(&rs_ops);
}
