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: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ivo van Doorn
John W. Linville
parent
7d7f19ccb7
commit
84e3196ff8
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@ -2,6 +2,7 @@ rt2x00lib-y += rt2x00dev.o
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rt2x00lib-y += rt2x00mac.o
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rt2x00lib-y += rt2x00config.o
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rt2x00lib-y += rt2x00queue.o
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rt2x00lib-y += rt2x00link.o
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rt2x00lib-$(CONFIG_RT2X00_LIB_DEBUGFS) += rt2x00debug.o
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rt2x00lib-$(CONFIG_RT2X00_LIB_CRYPTO) += rt2x00crypto.o
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rt2x00lib-$(CONFIG_RT2X00_LIB_RFKILL) += rt2x00rfkill.o
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@ -212,7 +212,7 @@ struct link_qual {
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* (WEIGHT_TX * tx_percentage) +
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* (WEIGHT_RX * rx_percentage)) / 100
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*
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* This value should then be checked to not be greated then 100.
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* This value should then be checked to not be greater then 100.
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*/
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int rx_percentage;
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int rx_success;
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@ -318,33 +318,6 @@ static inline int rt2x00_get_link_rssi(struct link *link)
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return DEFAULT_RSSI;
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}
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static inline int rt2x00_get_link_ant_rssi(struct link *link)
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{
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if (link->ant.rssi_ant && link->qual.rx_success)
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return link->ant.rssi_ant;
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return DEFAULT_RSSI;
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}
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static inline void rt2x00_reset_link_ant_rssi(struct link *link)
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{
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link->ant.rssi_ant = 0;
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}
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static inline int rt2x00_get_link_ant_rssi_history(struct link *link,
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enum antenna ant)
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{
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if (link->ant.rssi_history[ant - ANTENNA_A])
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return link->ant.rssi_history[ant - ANTENNA_A];
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return DEFAULT_RSSI;
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}
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static inline int rt2x00_update_ant_rssi(struct link *link, int rssi)
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{
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int old_rssi = link->ant.rssi_history[link->ant.active.rx - ANTENNA_A];
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link->ant.rssi_history[link->ant.active.rx - ANTENNA_A] = rssi;
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return old_rssi;
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}
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/*
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* Interface structure
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* Per interface configuration details, this structure
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@ -152,8 +152,7 @@ void rt2x00lib_config_antenna(struct rt2x00_dev *rt2x00dev,
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*/
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rt2x00dev->ops->lib->config_ant(rt2x00dev, ant);
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rt2x00lib_reset_link_tuner(rt2x00dev);
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rt2x00_reset_link_ant_rssi(&rt2x00dev->link);
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rt2x00link_reset_tuner(rt2x00dev, true);
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memcpy(active, ant, sizeof(*ant));
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@ -191,7 +190,7 @@ void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
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* which means we need to reset the link tuner.
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*/
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if (ieee80211_flags & IEEE80211_CONF_CHANGE_CHANNEL)
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rt2x00lib_reset_link_tuner(rt2x00dev);
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rt2x00link_reset_tuner(rt2x00dev, false);
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rt2x00dev->curr_band = conf->channel->band;
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rt2x00dev->tx_power = conf->power_level;
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@ -130,9 +130,11 @@ struct rt2x00debug_intf {
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};
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void rt2x00debug_update_crypto(struct rt2x00_dev *rt2x00dev,
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enum cipher cipher, enum rx_crypto status)
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struct rxdone_entry_desc *rxdesc)
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{
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struct rt2x00debug_intf *intf = rt2x00dev->debugfs_intf;
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enum cipher cipher = rxdesc->cipher;
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enum rx_crypto status = rxdesc->cipher_status;
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if (cipher == CIPHER_TKIP_NO_MIC)
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cipher = CIPHER_TKIP;
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@ -29,60 +29,6 @@
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#include "rt2x00.h"
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#include "rt2x00lib.h"
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/*
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* Link tuning handlers
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*/
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void rt2x00lib_reset_link_tuner(struct rt2x00_dev *rt2x00dev)
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{
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if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
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return;
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/*
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* Reset link information.
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* Both the currently active vgc level as well as
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* the link tuner counter should be reset. Resetting
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* the counter is important for devices where the
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* device should only perform link tuning during the
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* first minute after being enabled.
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*/
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rt2x00dev->link.count = 0;
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rt2x00dev->link.vgc_level = 0;
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/*
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* Reset the link tuner.
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*/
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rt2x00dev->ops->lib->reset_tuner(rt2x00dev);
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}
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static void rt2x00lib_start_link_tuner(struct rt2x00_dev *rt2x00dev)
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{
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/*
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* Clear all (possibly) pre-existing quality statistics.
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*/
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memset(&rt2x00dev->link.qual, 0, sizeof(rt2x00dev->link.qual));
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/*
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* The RX and TX percentage should start at 50%
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* this will assure we will get at least get some
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* decent value when the link tuner starts.
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* The value will be dropped and overwritten with
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* the correct (measured )value anyway during the
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* first run of the link tuner.
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*/
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rt2x00dev->link.qual.rx_percentage = 50;
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rt2x00dev->link.qual.tx_percentage = 50;
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rt2x00lib_reset_link_tuner(rt2x00dev);
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queue_delayed_work(rt2x00dev->hw->workqueue,
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&rt2x00dev->link.work, LINK_TUNE_INTERVAL);
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}
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static void rt2x00lib_stop_link_tuner(struct rt2x00_dev *rt2x00dev)
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{
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cancel_delayed_work_sync(&rt2x00dev->link.work);
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}
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/*
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* Radio control handlers.
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*/
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@ -161,238 +107,15 @@ void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
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* When we are disabling the RX, we should also stop the link tuner.
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*/
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if (state == STATE_RADIO_RX_OFF)
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rt2x00lib_stop_link_tuner(rt2x00dev);
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rt2x00link_stop_tuner(rt2x00dev);
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rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);
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/*
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* When we are enabling the RX, we should also start the link tuner.
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*/
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if (state == STATE_RADIO_RX_ON &&
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(rt2x00dev->intf_ap_count || rt2x00dev->intf_sta_count))
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rt2x00lib_start_link_tuner(rt2x00dev);
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}
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static void rt2x00lib_evaluate_antenna_sample(struct rt2x00_dev *rt2x00dev)
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{
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struct antenna_setup ant;
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int sample_a =
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rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_A);
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int sample_b =
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rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_B);
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memcpy(&ant, &rt2x00dev->link.ant.active, sizeof(ant));
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/*
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* We are done sampling. Now we should evaluate the results.
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*/
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rt2x00dev->link.ant.flags &= ~ANTENNA_MODE_SAMPLE;
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/*
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* During the last period we have sampled the RSSI
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* from both antenna's. It now is time to determine
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* which antenna demonstrated the best performance.
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* When we are already on the antenna with the best
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* performance, then there really is nothing for us
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* left to do.
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*/
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if (sample_a == sample_b)
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return;
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if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
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ant.rx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
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if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
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ant.tx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
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rt2x00lib_config_antenna(rt2x00dev, &ant);
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}
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static void rt2x00lib_evaluate_antenna_eval(struct rt2x00_dev *rt2x00dev)
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{
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struct antenna_setup ant;
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int rssi_curr = rt2x00_get_link_ant_rssi(&rt2x00dev->link);
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int rssi_old = rt2x00_update_ant_rssi(&rt2x00dev->link, rssi_curr);
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memcpy(&ant, &rt2x00dev->link.ant.active, sizeof(ant));
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/*
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* Legacy driver indicates that we should swap antenna's
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* when the difference in RSSI is greater that 5. This
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* also should be done when the RSSI was actually better
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* then the previous sample.
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* When the difference exceeds the threshold we should
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* sample the rssi from the other antenna to make a valid
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* comparison between the 2 antennas.
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*/
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if (abs(rssi_curr - rssi_old) < 5)
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return;
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rt2x00dev->link.ant.flags |= ANTENNA_MODE_SAMPLE;
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if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
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ant.rx = (ant.rx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
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if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
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ant.tx = (ant.tx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
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rt2x00lib_config_antenna(rt2x00dev, &ant);
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}
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static void rt2x00lib_evaluate_antenna(struct rt2x00_dev *rt2x00dev)
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{
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/*
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* Determine if software diversity is enabled for
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* either the TX or RX antenna (or both).
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* Always perform this check since within the link
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* tuner interval the configuration might have changed.
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*/
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rt2x00dev->link.ant.flags &= ~ANTENNA_RX_DIVERSITY;
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rt2x00dev->link.ant.flags &= ~ANTENNA_TX_DIVERSITY;
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if (rt2x00dev->default_ant.rx == ANTENNA_SW_DIVERSITY)
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rt2x00dev->link.ant.flags |= ANTENNA_RX_DIVERSITY;
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if (rt2x00dev->default_ant.tx == ANTENNA_SW_DIVERSITY)
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rt2x00dev->link.ant.flags |= ANTENNA_TX_DIVERSITY;
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if (!(rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY) &&
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!(rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)) {
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rt2x00dev->link.ant.flags = 0;
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return;
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}
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/*
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* If we have only sampled the data over the last period
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* we should now harvest the data. Otherwise just evaluate
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* the data. The latter should only be performed once
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* every 2 seconds.
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*/
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if (rt2x00dev->link.ant.flags & ANTENNA_MODE_SAMPLE)
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rt2x00lib_evaluate_antenna_sample(rt2x00dev);
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else if (rt2x00dev->link.count & 1)
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rt2x00lib_evaluate_antenna_eval(rt2x00dev);
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}
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static void rt2x00lib_update_link_stats(struct link *link, int rssi)
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{
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int avg_rssi = rssi;
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/*
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* Update global RSSI
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*/
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if (link->qual.avg_rssi)
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avg_rssi = MOVING_AVERAGE(link->qual.avg_rssi, rssi, 8);
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link->qual.avg_rssi = avg_rssi;
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/*
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* Update antenna RSSI
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*/
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if (link->ant.rssi_ant)
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rssi = MOVING_AVERAGE(link->ant.rssi_ant, rssi, 8);
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link->ant.rssi_ant = rssi;
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}
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static void rt2x00lib_precalculate_link_signal(struct link_qual *qual)
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{
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if (qual->rx_failed || qual->rx_success)
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qual->rx_percentage =
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(qual->rx_success * 100) /
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(qual->rx_failed + qual->rx_success);
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else
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qual->rx_percentage = 50;
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if (qual->tx_failed || qual->tx_success)
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qual->tx_percentage =
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(qual->tx_success * 100) /
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(qual->tx_failed + qual->tx_success);
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else
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qual->tx_percentage = 50;
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qual->rx_success = 0;
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qual->rx_failed = 0;
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qual->tx_success = 0;
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qual->tx_failed = 0;
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}
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static int rt2x00lib_calculate_link_signal(struct rt2x00_dev *rt2x00dev,
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int rssi)
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{
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int rssi_percentage = 0;
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int signal;
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/*
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* We need a positive value for the RSSI.
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*/
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if (rssi < 0)
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rssi += rt2x00dev->rssi_offset;
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/*
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* Calculate the different percentages,
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* which will be used for the signal.
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*/
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if (rt2x00dev->rssi_offset)
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rssi_percentage = (rssi * 100) / rt2x00dev->rssi_offset;
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/*
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* Add the individual percentages and use the WEIGHT
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* defines to calculate the current link signal.
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*/
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signal = ((WEIGHT_RSSI * rssi_percentage) +
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(WEIGHT_TX * rt2x00dev->link.qual.tx_percentage) +
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(WEIGHT_RX * rt2x00dev->link.qual.rx_percentage)) / 100;
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return (signal > 100) ? 100 : signal;
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}
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static void rt2x00lib_link_tuner(struct work_struct *work)
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{
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struct rt2x00_dev *rt2x00dev =
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container_of(work, struct rt2x00_dev, link.work.work);
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/*
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* When the radio is shutting down we should
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* immediately cease all link tuning.
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*/
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if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
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return;
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/*
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* Update statistics.
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*/
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rt2x00dev->ops->lib->link_stats(rt2x00dev, &rt2x00dev->link.qual);
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rt2x00dev->low_level_stats.dot11FCSErrorCount +=
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rt2x00dev->link.qual.rx_failed;
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/*
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* Only perform the link tuning when Link tuning
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* has been enabled (This could have been disabled from the EEPROM).
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*/
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if (!test_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags))
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rt2x00dev->ops->lib->link_tuner(rt2x00dev);
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/*
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* Precalculate a portion of the link signal which is
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* in based on the tx/rx success/failure counters.
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*/
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rt2x00lib_precalculate_link_signal(&rt2x00dev->link.qual);
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/*
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* Send a signal to the led to update the led signal strength.
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*/
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rt2x00leds_led_quality(rt2x00dev, rt2x00dev->link.qual.avg_rssi);
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/*
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* Evaluate antenna setup, make this the last step since this could
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* possibly reset some statistics.
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*/
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rt2x00lib_evaluate_antenna(rt2x00dev);
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/*
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* Increase tuner counter, and reschedule the next link tuner run.
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*/
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rt2x00dev->link.count++;
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queue_delayed_work(rt2x00dev->hw->workqueue,
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&rt2x00dev->link.work, LINK_TUNE_INTERVAL);
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if (state == STATE_RADIO_RX_ON)
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rt2x00link_start_tuner(rt2x00dev);
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}
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static void rt2x00lib_packetfilter_scheduled(struct work_struct *work)
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@ -597,7 +320,6 @@ void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
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struct sk_buff *skb;
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struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
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struct ieee80211_supported_band *sband;
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struct ieee80211_hdr *hdr;
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const struct rt2x00_rate *rate;
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unsigned int header_length;
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unsigned int align;
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@ -674,23 +396,14 @@ void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
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}
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/*
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* Only update link status if this is a beacon frame carrying our bssid.
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* Update extra components
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*/
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hdr = (struct ieee80211_hdr *)entry->skb->data;
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if (ieee80211_is_beacon(hdr->frame_control) &&
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(rxdesc.dev_flags & RXDONE_MY_BSS))
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rt2x00lib_update_link_stats(&rt2x00dev->link, rxdesc.rssi);
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rt2x00debug_update_crypto(rt2x00dev,
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rxdesc.cipher,
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rxdesc.cipher_status);
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rt2x00dev->link.qual.rx_success++;
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rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
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rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
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rx_status->mactime = rxdesc.timestamp;
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rx_status->rate_idx = idx;
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rx_status->qual =
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rt2x00lib_calculate_link_signal(rt2x00dev, rxdesc.rssi);
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rx_status->qual = rt2x00link_calculate_signal(rt2x00dev, rxdesc.rssi);
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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);
|
||||
|
|
|
|||
|
|
@ -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 */
|
||||
|
|
|
|||
|
|
@ -0,0 +1,402 @@
|
|||
/*
|
||||
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);
|
||||
}
|
||||
Reference in New Issue