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Commit 84e3196f authored by Ivo van Doorn's avatar Ivo van Doorn Committed by John W. Linville
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rt2x00: Move link tuning into seperate file 

Move link and antenna tuning into a seperate file named rt2x00link.c,
this makes the interface to the link tuner a lot cleaner.
Signed-off-by: default avatarIvo van Doorn <IvDoorn@gmail.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 7d7f19cc
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Showing with 494 additions and 331 deletions
drivers/net/wireless/rt2x00/Makefile
View file @ 84e3196f
......@@ -2,6 +2,7 @@ rt2x00lib-y += rt2x00dev.o
rt2x00lib-y += rt2x00mac.o
rt2x00lib-y += rt2x00config.o
rt2x00lib-y += rt2x00queue.o
rt2x00lib-y += rt2x00link.o
rt2x00lib-$(CONFIG_RT2X00_LIB_DEBUGFS) += rt2x00debug.o
rt2x00lib-$(CONFIG_RT2X00_LIB_CRYPTO) += rt2x00crypto.o
rt2x00lib-$(CONFIG_RT2X00_LIB_RFKILL) += rt2x00rfkill.o
......
drivers/net/wireless/rt2x00/rt2x00.h
View file @ 84e3196f
......@@ -212,7 +212,7 @@ struct link_qual {
* (WEIGHT_TX * tx_percentage) +
* (WEIGHT_RX * rx_percentage)) / 100
*
* This value should then be checked to not be greated then 100.
* This value should then be checked to not be greater then 100.
*/
int rx_percentage;
int rx_success;
......@@ -318,33 +318,6 @@ static inline int rt2x00_get_link_rssi(struct link *link)
return DEFAULT_RSSI;
}
static inline int rt2x00_get_link_ant_rssi(struct link *link)
{
if (link->ant.rssi_ant && link->qual.rx_success)
return link->ant.rssi_ant;
return DEFAULT_RSSI;
}
static inline void rt2x00_reset_link_ant_rssi(struct link *link)
{
link->ant.rssi_ant = 0;
}
static inline int rt2x00_get_link_ant_rssi_history(struct link *link,
enum antenna ant)
{
if (link->ant.rssi_history[ant - ANTENNA_A])
return link->ant.rssi_history[ant - ANTENNA_A];
return DEFAULT_RSSI;
}
static inline int rt2x00_update_ant_rssi(struct link *link, int rssi)
{
int old_rssi = link->ant.rssi_history[link->ant.active.rx - ANTENNA_A];
link->ant.rssi_history[link->ant.active.rx - ANTENNA_A] = rssi;
return old_rssi;
}
/*
* Interface structure
* Per interface configuration details, this structure
......
drivers/net/wireless/rt2x00/rt2x00config.c
View file @ 84e3196f
......@@ -152,8 +152,7 @@ void rt2x00lib_config_antenna(struct rt2x00_dev *rt2x00dev,
*/
rt2x00dev->ops->lib->config_ant(rt2x00dev, ant);
rt2x00lib_reset_link_tuner(rt2x00dev);
rt2x00_reset_link_ant_rssi(&rt2x00dev->link);
rt2x00link_reset_tuner(rt2x00dev, true);
memcpy(active, ant, sizeof(*ant));
......@@ -191,7 +190,7 @@ void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
* which means we need to reset the link tuner.
*/
if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL)
rt2x00lib_reset_link_tuner(rt2x00dev);
rt2x00link_reset_tuner(rt2x00dev, false);
rt2x00dev->curr_band = conf->channel->band;
rt2x00dev->tx_power = conf->power_level;
......
drivers/net/wireless/rt2x00/rt2x00debug.c
View file @ 84e3196f
......@@ -130,9 +130,11 @@ struct rt2x00debug_intf {
};
void rt2x00debug_update_crypto(struct rt2x00_dev *rt2x00dev,
enum cipher cipher, enum rx_crypto status)
struct rxdone_entry_desc *rxdesc)
{
struct rt2x00debug_intf *intf = rt2x00dev->debugfs_intf;
enum cipher cipher = rxdesc->cipher;
enum rx_crypto status = rxdesc->cipher_status;
if (cipher == CIPHER_TKIP_NO_MIC)
cipher = CIPHER_TKIP;
......
drivers/net/wireless/rt2x00/rt2x00dev.c
View file @ 84e3196f
......@@ -29,60 +29,6 @@
#include "rt2x00.h"
#include "rt2x00lib.h"
/*
* Link tuning handlers
*/
void rt2x00lib_reset_link_tuner(struct rt2x00_dev *rt2x00dev)
{
if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
return;
/*
* Reset link information.
* Both the currently active vgc level as well as
* the link tuner counter should be reset. Resetting
* the counter is important for devices where the
* device should only perform link tuning during the
* first minute after being enabled.
*/
rt2x00dev->link.count = 0;
rt2x00dev->link.vgc_level = 0;
/*
* Reset the link tuner.
*/
rt2x00dev->ops->lib->reset_tuner(rt2x00dev);
}
static void rt2x00lib_start_link_tuner(struct rt2x00_dev *rt2x00dev)
{
/*
* Clear all (possibly) pre-existing quality statistics.
*/
memset(&rt2x00dev->link.qual, 0, sizeof(rt2x00dev->link.qual));
/*
* The RX and TX percentage should start at 50%
* this will assure we will get at least get some
* decent value when the link tuner starts.
* The value will be dropped and overwritten with
* the correct (measured )value anyway during the
* first run of the link tuner.
*/
rt2x00dev->link.qual.rx_percentage = 50;
rt2x00dev->link.qual.tx_percentage = 50;
rt2x00lib_reset_link_tuner(rt2x00dev);
queue_delayed_work(rt2x00dev->hw->workqueue,
&rt2x00dev->link.work, LINK_TUNE_INTERVAL);
}
static void rt2x00lib_stop_link_tuner(struct rt2x00_dev *rt2x00dev)
{
cancel_delayed_work_sync(&rt2x00dev->link.work);
}
/*
* Radio control handlers.
*/
......@@ -161,238 +107,15 @@ void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
* When we are disabling the RX, we should also stop the link tuner.
*/
if (state == STATE_RADIO_RX_OFF)
rt2x00lib_stop_link_tuner(rt2x00dev);
rt2x00link_stop_tuner(rt2x00dev);
rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
/*
* When we are enabling the RX, we should also start the link tuner.
*/
if (state == STATE_RADIO_RX_ON &&
(rt2x00dev->intf_ap_count || rt2x00dev->intf_sta_count))
rt2x00lib_start_link_tuner(rt2x00dev);
}
static void rt2x00lib_evaluate_antenna_sample(struct rt2x00_dev *rt2x00dev)
{
struct antenna_setup ant;
int sample_a =
rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_A);
int sample_b =
rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_B);
memcpy(&ant, &rt2x00dev->link.ant.active, sizeof(ant));
/*
* We are done sampling. Now we should evaluate the results.
*/
rt2x00dev->link.ant.flags &= ~ANTENNA_MODE_SAMPLE;
/*
* During the last period we have sampled the RSSI
* from both antenna's. It now is time to determine
* which antenna demonstrated the best performance.
* When we are already on the antenna with the best
* performance, then there really is nothing for us
* left to do.
*/
if (sample_a == sample_b)
return;
if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
ant.rx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
ant.tx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
rt2x00lib_config_antenna(rt2x00dev, &ant);
}
static void rt2x00lib_evaluate_antenna_eval(struct rt2x00_dev *rt2x00dev)
{
struct antenna_setup ant;
int rssi_curr = rt2x00_get_link_ant_rssi(&rt2x00dev->link);
int rssi_old = rt2x00_update_ant_rssi(&rt2x00dev->link, rssi_curr);
memcpy(&ant, &rt2x00dev->link.ant.active, sizeof(ant));
/*
* Legacy driver indicates that we should swap antenna's
* when the difference in RSSI is greater that 5. This
* also should be done when the RSSI was actually better
* then the previous sample.
* When the difference exceeds the threshold we should
* sample the rssi from the other antenna to make a valid
* comparison between the 2 antennas.
*/
if (abs(rssi_curr - rssi_old) < 5)
return;
rt2x00dev->link.ant.flags |= ANTENNA_MODE_SAMPLE;
if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
ant.rx = (ant.rx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
ant.tx = (ant.tx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
rt2x00lib_config_antenna(rt2x00dev, &ant);
}
static void rt2x00lib_evaluate_antenna(struct rt2x00_dev *rt2x00dev)
{
/*
* Determine if software diversity is enabled for
* either the TX or RX antenna (or both).
* Always perform this check since within the link
* tuner interval the configuration might have changed.
*/
rt2x00dev->link.ant.flags &= ~ANTENNA_RX_DIVERSITY;
rt2x00dev->link.ant.flags &= ~ANTENNA_TX_DIVERSITY;
if (rt2x00dev->default_ant.rx == ANTENNA_SW_DIVERSITY)
rt2x00dev->link.ant.flags |= ANTENNA_RX_DIVERSITY;
if (rt2x00dev->default_ant.tx == ANTENNA_SW_DIVERSITY)
rt2x00dev->link.ant.flags |= ANTENNA_TX_DIVERSITY;
if (!(rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY) &&
!(rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)) {
rt2x00dev->link.ant.flags = 0;
return;
}
/*
* If we have only sampled the data over the last period
* we should now harvest the data. Otherwise just evaluate
* the data. The latter should only be performed once
* every 2 seconds.
*/
if (rt2x00dev->link.ant.flags & ANTENNA_MODE_SAMPLE)
rt2x00lib_evaluate_antenna_sample(rt2x00dev);
else if (rt2x00dev->link.count & 1)
rt2x00lib_evaluate_antenna_eval(rt2x00dev);
}
static void rt2x00lib_update_link_stats(struct link *link, int rssi)
{
int avg_rssi = rssi;
/*
* Update global RSSI
*/
if (link->qual.avg_rssi)
avg_rssi = MOVING_AVERAGE(link->qual.avg_rssi, rssi, 8);
link->qual.avg_rssi = avg_rssi;
/*
* Update antenna RSSI
*/
if (link->ant.rssi_ant)
rssi = MOVING_AVERAGE(link->ant.rssi_ant, rssi, 8);
link->ant.rssi_ant = rssi;
}
static void rt2x00lib_precalculate_link_signal(struct link_qual *qual)
{
if (qual->rx_failed || qual->rx_success)
qual->rx_percentage =
(qual->rx_success * 100) /
(qual->rx_failed + qual->rx_success);
else
qual->rx_percentage = 50;
if (qual->tx_failed || qual->tx_success)
qual->tx_percentage =
(qual->tx_success * 100) /
(qual->tx_failed + qual->tx_success);
else
qual->tx_percentage = 50;
qual->rx_success = 0;
qual->rx_failed = 0;
qual->tx_success = 0;
qual->tx_failed = 0;
}
static int rt2x00lib_calculate_link_signal(struct rt2x00_dev *rt2x00dev,
int rssi)
{
int rssi_percentage = 0;
int signal;
/*
* We need a positive value for the RSSI.
*/
if (rssi < 0)
rssi += rt2x00dev->rssi_offset;
/*
* Calculate the different percentages,
* which will be used for the signal.
*/
if (rt2x00dev->rssi_offset)
rssi_percentage = (rssi * 100) / rt2x00dev->rssi_offset;
/*
* Add the individual percentages and use the WEIGHT
* defines to calculate the current link signal.
*/
signal = ((WEIGHT_RSSI * rssi_percentage) +
(WEIGHT_TX * rt2x00dev->link.qual.tx_percentage) +
(WEIGHT_RX * rt2x00dev->link.qual.rx_percentage)) / 100;
return (signal > 100) ? 100 : signal;
}
static void rt2x00lib_link_tuner(struct work_struct *work)
{
struct rt2x00_dev *rt2x00dev =
container_of(work, struct rt2x00_dev, link.work.work);
/*
* When the radio is shutting down we should
* immediately cease all link tuning.
*/
if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
return;
/*
* Update statistics.
*/
rt2x00dev->ops->lib->link_stats(rt2x00dev, &rt2x00dev->link.qual);
rt2x00dev->low_level_stats.dot11FCSErrorCount +=
rt2x00dev->link.qual.rx_failed;
/*
* Only perform the link tuning when Link tuning
* has been enabled (This could have been disabled from the EEPROM).
*/
if (!test_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags))
rt2x00dev->ops->lib->link_tuner(rt2x00dev);
/*
* Precalculate a portion of the link signal which is
* in based on the tx/rx success/failure counters.
*/
rt2x00lib_precalculate_link_signal(&rt2x00dev->link.qual);
/*
* Send a signal to the led to update the led signal strength.
*/
rt2x00leds_led_quality(rt2x00dev, rt2x00dev->link.qual.avg_rssi);
/*
* Evaluate antenna setup, make this the last step since this could
* possibly reset some statistics.
*/
rt2x00lib_evaluate_antenna(rt2x00dev);
/*
* Increase tuner counter, and reschedule the next link tuner run.
*/
rt2x00dev->link.count++;
queue_delayed_work(rt2x00dev->hw->workqueue,
&rt2x00dev->link.work, LINK_TUNE_INTERVAL);
if (state == STATE_RADIO_RX_ON)
rt2x00link_start_tuner(rt2x00dev);
}
static void rt2x00lib_packetfilter_scheduled(struct work_struct *work)
......@@ -597,7 +320,6 @@ void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
struct sk_buff *skb;
struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
struct ieee80211_supported_band *sband;
struct ieee80211_hdr *hdr;
const struct rt2x00_rate *rate;
unsigned int header_length;
unsigned int align;
......@@ -674,23 +396,14 @@ void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
}
/*
* Only update link status if this is a beacon frame carrying our bssid.
* Update extra components
*/
hdr = (struct ieee80211_hdr *)entry->skb->data;
if (ieee80211_is_beacon(hdr->frame_control) &&
(rxdesc.dev_flags & RXDONE_MY_BSS))
rt2x00lib_update_link_stats(&rt2x00dev->link, rxdesc.rssi);
rt2x00debug_update_crypto(rt2x00dev,
rxdesc.cipher,
rxdesc.cipher_status);
rt2x00dev->link.qual.rx_success++;
rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
rx_status->mactime = rxdesc.timestamp;
rx_status->rate_idx = idx;
rx_status->qual =
rt2x00lib_calculate_link_signal(rt2x00dev, rxdesc.rssi);
rx_status->qual = rt2x00link_calculate_signal(rt2x00dev, rxdesc.rssi);
rx_status->signal = rxdesc.rssi;
rx_status->flag = rxdesc.flags;
rx_status->antenna = rt2x00dev->link.ant.active.rx;
......@@ -1083,7 +796,6 @@ int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
*/
INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
INIT_WORK(&rt2x00dev->filter_work, rt2x00lib_packetfilter_scheduled);
INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00lib_link_tuner);
/*
* Allocate queue array.
......@@ -1104,6 +816,7 @@ int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
/*
* Register extra components.
*/
rt2x00link_register(rt2x00dev);
rt2x00leds_register(rt2x00dev);
rt2x00rfkill_allocate(rt2x00dev);
rt2x00debug_register(rt2x00dev);
......
drivers/net/wireless/rt2x00/rt2x00lib.h
View file @ 84e3196f
......@@ -63,7 +63,6 @@ static inline const struct rt2x00_rate *rt2x00_get_rate(const u16 hw_value)
int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev);
void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev);
void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state);
void rt2x00lib_reset_link_tuner(struct rt2x00_dev *rt2x00dev);
/*
* Initialization handlers.
......@@ -154,6 +153,81 @@ void rt2x00queue_uninitialize(struct rt2x00_dev *rt2x00dev);
int rt2x00queue_allocate(struct rt2x00_dev *rt2x00dev);
void rt2x00queue_free(struct rt2x00_dev *rt2x00dev);
/**
* rt2x00link_update_stats - Update link statistics from RX frame
* @rt2x00dev: Pointer to &struct rt2x00_dev.
* @skb: Received frame
* @rxdesc: Received frame descriptor
*
* Update link statistics based on the information from the
* received frame descriptor.
*/
void rt2x00link_update_stats(struct rt2x00_dev *rt2x00dev,
struct sk_buff *skb,
struct rxdone_entry_desc *rxdesc);
/**
* rt2x00link_calculate_signal - Calculate signal quality
* @rt2x00dev: Pointer to &struct rt2x00_dev.
* @rssi: RX Frame RSSI
*
* Calculate the signal quality of a frame based on the rssi
* measured during the receiving of the frame and the global
* link quality statistics measured since the start of the
* link tuning. The result is a value between 0 and 100 which
* is an indication of the signal quality.
*/
int rt2x00link_calculate_signal(struct rt2x00_dev *rt2x00dev, int rssi);
/**
* rt2x00link_start_tuner - Start periodic link tuner work
* @rt2x00dev: Pointer to &struct rt2x00_dev.
*
* This start the link tuner periodic work, this work will
* be executed periodically until &rt2x00link_stop_tuner has
* been called.
*/
void rt2x00link_start_tuner(struct rt2x00_dev *rt2x00dev);
/**
* rt2x00link_stop_tuner - Stop periodic link tuner work
* @rt2x00dev: Pointer to &struct rt2x00_dev.
*
* After this function completed the link tuner will not
* be running until &rt2x00link_start_tuner is called.
*/
void rt2x00link_stop_tuner(struct rt2x00_dev *rt2x00dev);
/**
* rt2x00link_reset_tuner - Reset periodic link tuner work
* @rt2x00dev: Pointer to &struct rt2x00_dev.
* @antenna: Should the antenna tuning also be reset
*
* The VGC limit configured in the hardware will be reset to 0
* which forces the driver to rediscover the correct value for
* the current association. This is needed when configuration
* options have changed which could drastically change the
* SNR level or link quality (i.e. changing the antenna setting).
*
* Resetting the link tuner will also cause the periodic work counter
* to be reset. Any driver which has a fixed limit on the number
* of rounds the link tuner is supposed to work will accept the
* tuner actions again if this limit was previously reached.
*
* If @antenna is set to true a the software antenna diversity
* tuning will also be reset.
*/
void rt2x00link_reset_tuner(struct rt2x00_dev *rt2x00dev, bool antenna);
/**
* rt2x00link_register - Initialize link tuning functionality
* @rt2x00dev: Pointer to &struct rt2x00_dev.
*
* Initialize work structure and all link tuning related
* paramters. This will not start the link tuning process itself.
*/
void rt2x00link_register(struct rt2x00_dev *rt2x00dev);
/*
* Firmware handlers.
*/
......@@ -179,7 +253,7 @@ void rt2x00debug_deregister(struct rt2x00_dev *rt2x00dev);
void rt2x00debug_dump_frame(struct rt2x00_dev *rt2x00dev,
enum rt2x00_dump_type type, struct sk_buff *skb);
void rt2x00debug_update_crypto(struct rt2x00_dev *rt2x00dev,
enum cipher cipher, enum rx_crypto status);
struct rxdone_entry_desc *rxdesc);
#else
static inline void rt2x00debug_register(struct rt2x00_dev *rt2x00dev)
{
......@@ -196,8 +270,7 @@ static inline void rt2x00debug_dump_frame(struct rt2x00_dev *rt2x00dev,
}
static inline void rt2x00debug_update_crypto(struct rt2x00_dev *rt2x00dev,
enum cipher cipher,
enum rx_crypto status)
struct rxdone_entry_desc *rxdesc)
{
}
#endif /* CONFIG_RT2X00_LIB_DEBUGFS */
......
drivers/net/wireless/rt2x00/rt2x00link.c 0 → 100644
View file @ 84e3196f
/*
Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
<http://rt2x00.serialmonkey.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
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.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*
Module: rt2x00lib
Abstract: rt2x00 generic link tuning routines.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include "rt2x00.h"
#include "rt2x00lib.h"
static int rt2x00link_antenna_get_link_rssi(struct rt2x00_dev *rt2x00dev)
{
struct link_ant *ant = &rt2x00dev->link.ant;
if (ant->rssi_ant && rt2x00dev->link.qual.rx_success)
return ant->rssi_ant;
return DEFAULT_RSSI;
}
static int rt2x00link_antenna_get_rssi_history(struct rt2x00_dev *rt2x00dev,
enum antenna antenna)
{
struct link_ant *ant = &rt2x00dev->link.ant;
if (ant->rssi_history[antenna - ANTENNA_A])
return ant->rssi_history[antenna - ANTENNA_A];
return DEFAULT_RSSI;
}
/* Small wrapper for rt2x00link_antenna_get_rssi_history() */
#define rt2x00link_antenna_get_rssi_rx_history(__dev) \
rt2x00link_antenna_get_rssi_history((__dev), \
(__dev)->link.ant.active.rx)
#define rt2x00link_antenna_get_rssi_tx_history(__dev) \
rt2x00link_antenna_get_rssi_history((__dev), \
(__dev)->link.ant.active.tx)
static void rt2x00link_antenna_update_rssi_history(struct rt2x00_dev *rt2x00dev,
enum antenna antenna,
int rssi)
{
struct link_ant *ant = &rt2x00dev->link.ant;
ant->rssi_history[ant->active.rx - ANTENNA_A] = rssi;
}
/* Small wrapper for rt2x00link_antenna_get_rssi_history() */
#define rt2x00link_antenna_update_rssi_rx_history(__dev, __rssi) \
rt2x00link_antenna_update_rssi_history((__dev), \
(__dev)->link.ant.active.rx, \
(__rssi))
#define rt2x00link_antenna_update_rssi_tx_history(__dev, __rssi) \
rt2x00link_antenna_update_rssi_history((__dev), \
(__dev)->link.ant.active.tx, \
(__rssi))
static void rt2x00link_antenna_reset(struct rt2x00_dev *rt2x00dev)
{
rt2x00dev->link.ant.rssi_ant = 0;
}
static void rt2x00lib_antenna_diversity_sample(struct rt2x00_dev *rt2x00dev)
{
struct link_ant *ant = &rt2x00dev->link.ant;
struct antenna_setup new_ant;
int sample_a = rt2x00link_antenna_get_rssi_history(rt2x00dev, ANTENNA_A);
int sample_b = rt2x00link_antenna_get_rssi_history(rt2x00dev, ANTENNA_B);
memcpy(&new_ant, &ant->active, sizeof(new_ant));
/*
* We are done sampling. Now we should evaluate the results.
*/
ant->flags &= ~ANTENNA_MODE_SAMPLE;
/*
* During the last period we have sampled the RSSI
* from both antenna's. It now is time to determine
* which antenna demonstrated the best performance.
* When we are already on the antenna with the best
* performance, then there really is nothing for us
* left to do.
*/
if (sample_a == sample_b)
return;
if (ant->flags & ANTENNA_RX_DIVERSITY)
new_ant.rx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
if (ant->flags & ANTENNA_TX_DIVERSITY)
new_ant.tx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
rt2x00lib_config_antenna(rt2x00dev, &new_ant);
}
static void rt2x00lib_antenna_diversity_eval(struct rt2x00_dev *rt2x00dev)
{
struct link_ant *ant = &rt2x00dev->link.ant;
struct antenna_setup new_ant;
int rssi_curr;
int rssi_old;
memcpy(&new_ant, &ant->active, sizeof(new_ant));
/*
* Get current RSSI value along with the historical value,
* after that update the history with the current value.
*/
rssi_curr = rt2x00link_antenna_get_link_rssi(rt2x00dev);
rssi_old = rt2x00link_antenna_get_rssi_rx_history(rt2x00dev);
rt2x00link_antenna_update_rssi_rx_history(rt2x00dev, rssi_curr);
/*
* Legacy driver indicates that we should swap antenna's
* when the difference in RSSI is greater that 5. This
* also should be done when the RSSI was actually better
* then the previous sample.
* When the difference exceeds the threshold we should
* sample the rssi from the other antenna to make a valid
* comparison between the 2 antennas.
*/
if (abs(rssi_curr - rssi_old) < 5)
return;
ant->flags |= ANTENNA_MODE_SAMPLE;
if (ant->flags & ANTENNA_RX_DIVERSITY)
new_ant.rx = (new_ant.rx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
if (ant->flags & ANTENNA_TX_DIVERSITY)
new_ant.tx = (new_ant.tx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
rt2x00lib_config_antenna(rt2x00dev, &new_ant);
}
static void rt2x00lib_antenna_diversity(struct rt2x00_dev *rt2x00dev)
{
struct link_ant *ant = &rt2x00dev->link.ant;
/*
* Determine if software diversity is enabled for
* either the TX or RX antenna (or both).
* Always perform this check since within the link
* tuner interval the configuration might have changed.
*/
ant->flags &= ~ANTENNA_RX_DIVERSITY;
ant->flags &= ~ANTENNA_TX_DIVERSITY;
if (rt2x00dev->default_ant.rx == ANTENNA_SW_DIVERSITY)
ant->flags |= ANTENNA_RX_DIVERSITY;
if (rt2x00dev->default_ant.tx == ANTENNA_SW_DIVERSITY)
ant->flags |= ANTENNA_TX_DIVERSITY;
if (!(ant->flags & ANTENNA_RX_DIVERSITY) &&
!(ant->flags & ANTENNA_TX_DIVERSITY)) {
ant->flags = 0;
return;
}
/*
* If we have only sampled the data over the last period
* we should now harvest the data. Otherwise just evaluate
* the data. The latter should only be performed once
* every 2 seconds.
*/
if (ant->flags & ANTENNA_MODE_SAMPLE)
rt2x00lib_antenna_diversity_sample(rt2x00dev);
else if (rt2x00dev->link.count & 1)
rt2x00lib_antenna_diversity_eval(rt2x00dev);
}
void rt2x00link_update_stats(struct rt2x00_dev *rt2x00dev,
struct sk_buff *skb,
struct rxdone_entry_desc *rxdesc)
{
struct link_qual *qual = &rt2x00dev->link.qual;
struct link_ant *ant = &rt2x00dev->link.ant;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
int avg_rssi = rxdesc->rssi;
int ant_rssi = rxdesc->rssi;
/*
* Frame was received successfully since non-succesfull
* frames would have been dropped by the hardware.
*/
qual->rx_success++;
/*
* We are only interested in quality statistics from
* beacons which came from the BSS which we are
* associated with.
*/
if (!ieee80211_is_beacon(hdr->frame_control) ||
!(rxdesc->dev_flags & RXDONE_MY_BSS))
return;
/*
* Update global RSSI
*/
if (qual->avg_rssi)
avg_rssi = MOVING_AVERAGE(qual->avg_rssi, rxdesc->rssi, 8);
qual->avg_rssi = avg_rssi;
/*
* Update antenna RSSI
*/
if (ant->rssi_ant)
ant_rssi = MOVING_AVERAGE(ant->rssi_ant, rxdesc->rssi, 8);
ant->rssi_ant = ant_rssi;
}
static void rt2x00link_precalculate_signal(struct rt2x00_dev *rt2x00dev)
{
struct link_qual *qual = &rt2x00dev->link.qual;
if (qual->rx_failed || qual->rx_success)
qual->rx_percentage =
(qual->rx_success * 100) /
(qual->rx_failed + qual->rx_success);
else
qual->rx_percentage = 50;
if (qual->tx_failed || qual->tx_success)
qual->tx_percentage =
(qual->tx_success * 100) /
(qual->tx_failed + qual->tx_success);
else
qual->tx_percentage = 50;
qual->rx_success = 0;
qual->rx_failed = 0;
qual->tx_success = 0;
qual->tx_failed = 0;
}
int rt2x00link_calculate_signal(struct rt2x00_dev *rt2x00dev, int rssi)
{
struct link_qual *qual = &rt2x00dev->link.qual;
int rssi_percentage = 0;
int signal;
/*
* We need a positive value for the RSSI.
*/
if (rssi < 0)
rssi += rt2x00dev->rssi_offset;
/*
* Calculate the different percentages,
* which will be used for the signal.
*/
rssi_percentage = (rssi * 100) / rt2x00dev->rssi_offset;
/*
* Add the individual percentages and use the WEIGHT
* defines to calculate the current link signal.
*/
signal = ((WEIGHT_RSSI * rssi_percentage) +
(WEIGHT_TX * qual->tx_percentage) +
(WEIGHT_RX * qual->rx_percentage)) / 100;
return max_t(int, signal, 100);
}
void rt2x00link_start_tuner(struct rt2x00_dev *rt2x00dev)
{
struct link_qual *qual = &rt2x00dev->link.qual;
/*
* Link tuning should only be performed when
* an active sta or master interface exists.
* Single monitor mode interfaces should never have
* work with link tuners.
*/
if (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count)
return;
/*
* Clear all (possibly) pre-existing quality statistics.
*/
memset(qual, 0, sizeof(*qual));
/*
* The RX and TX percentage should start at 50%
* this will assure we will get at least get some
* decent value when the link tuner starts.
* The value will be dropped and overwritten with
* the correct (measured) value anyway during the
* first run of the link tuner.
*/
qual->rx_percentage = 50;
qual->tx_percentage = 50;
rt2x00link_reset_tuner(rt2x00dev, false);
queue_delayed_work(rt2x00dev->hw->workqueue,
&rt2x00dev->link.work, LINK_TUNE_INTERVAL);
}
void rt2x00link_stop_tuner(struct rt2x00_dev *rt2x00dev)
{
cancel_delayed_work_sync(&rt2x00dev->link.work);
}
void rt2x00link_reset_tuner(struct rt2x00_dev *rt2x00dev, bool antenna)
{
if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
return;
/*
* Reset link information.
* Both the currently active vgc level as well as
* the link tuner counter should be reset. Resetting
* the counter is important for devices where the
* device should only perform link tuning during the
* first minute after being enabled.
*/
rt2x00dev->link.count = 0;
rt2x00dev->link.vgc_level = 0;
/*
* Reset the link tuner.
*/
rt2x00dev->ops->lib->reset_tuner(rt2x00dev);
if (antenna)
rt2x00link_antenna_reset(rt2x00dev);
}
static void rt2x00link_tuner(struct work_struct *work)
{
struct rt2x00_dev *rt2x00dev =
container_of(work, struct rt2x00_dev, link.work.work);
struct link_qual *qual = &rt2x00dev->link.qual;
/*
* When the radio is shutting down we should
* immediately cease all link tuning.
*/
if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
return;
/*
* Update statistics.
*/
rt2x00dev->ops->lib->link_stats(rt2x00dev, qual);
rt2x00dev->low_level_stats.dot11FCSErrorCount += qual->rx_failed;
/*
* Only perform the link tuning when Link tuning
* has been enabled (This could have been disabled from the EEPROM).
*/
if (!test_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags))
rt2x00dev->ops->lib->link_tuner(rt2x00dev);
/*
* Precalculate a portion of the link signal which is
* in based on the tx/rx success/failure counters.
*/
rt2x00link_precalculate_signal(rt2x00dev);
/*
* Send a signal to the led to update the led signal strength.
*/
rt2x00leds_led_quality(rt2x00dev, qual->avg_rssi);
/*
* Evaluate antenna setup, make this the last step since this could
* possibly reset some statistics.
*/
rt2x00lib_antenna_diversity(rt2x00dev);
/*
* Increase tuner counter, and reschedule the next link tuner run.
*/
rt2x00dev->link.count++;
queue_delayed_work(rt2x00dev->hw->workqueue,
&rt2x00dev->link.work, LINK_TUNE_INTERVAL);
}
void rt2x00link_register(struct rt2x00_dev *rt2x00dev)
{
INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00link_tuner);
}
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