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2111ac0d88
This is an Adaptive Noise Imunity (ANI) implementation for ath5k. I have looked at both ath9k and HAL sources (they are nearly the same), and even though i have implemented some things differently, the basic algorithm is practically the same, for now. I hope that this can serve as a clean start to improve the algorithm later. This also adds a possibility to manually control ANI settings, right now only thru a debugfs file: * set lowest sensitivity (=highest noise immunity): echo sens-low > /sys/kernel/debug/ath5k/phy0/ani * set highest sensitivity (=lowest noise immunity): echo sens-high > /sys/kernel/debug/ath5k/phy0/ani * automatically control immunity (default): echo ani-on > /sys/kernel/debug/ath5k/phy0/ani * to see the parameters in use and watch them change: cat /sys/kernel/debug/ath5k/phy0/ani Manually setting sensitivity will turn the automatic control off. You can also control each of the five immunity parameters (noise immunity, spur immunity, firstep, ofdm weak signal detection, cck weak signal detection) manually thru the debugfs file. This is tested on AR5414 and nearly doubles the thruput in a noisy 2GHz band. Signed-off-by: Bruno Randolf <br1@einfach.org> Signed-off-by: John W. Linville <linville@tuxdriver.com>
105 lines
3.4 KiB
C
105 lines
3.4 KiB
C
/*
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* Copyright (C) 2010 Bruno Randolf <br1@einfach.org>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef ANI_H
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#define ANI_H
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/* these thresholds are relative to the ATH5K_ANI_LISTEN_PERIOD */
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#define ATH5K_ANI_LISTEN_PERIOD 100
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#define ATH5K_ANI_OFDM_TRIG_HIGH 500
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#define ATH5K_ANI_OFDM_TRIG_LOW 200
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#define ATH5K_ANI_CCK_TRIG_HIGH 200
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#define ATH5K_ANI_CCK_TRIG_LOW 100
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/* average beacon RSSI thresholds */
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#define ATH5K_ANI_RSSI_THR_HIGH 40
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#define ATH5K_ANI_RSSI_THR_LOW 7
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/* maximum availabe levels */
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#define ATH5K_ANI_MAX_FIRSTEP_LVL 2
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#define ATH5K_ANI_MAX_NOISE_IMM_LVL 1
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/**
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* enum ath5k_ani_mode - mode for ANI / noise sensitivity
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*
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* @ATH5K_ANI_MODE_OFF: Turn ANI off. This can be useful to just stop the ANI
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* algorithm after it has been on auto mode.
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* ATH5K_ANI_MODE_MANUAL_LOW: Manually set all immunity parameters to low,
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* maximizing sensitivity. ANI will not run.
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* ATH5K_ANI_MODE_MANUAL_HIGH: Manually set all immunity parameters to high,
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* minimizing sensitivity. ANI will not run.
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* ATH5K_ANI_MODE_AUTO: Automatically control immunity parameters based on the
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* amount of OFDM and CCK frame errors (default).
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*/
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enum ath5k_ani_mode {
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ATH5K_ANI_MODE_OFF = 0,
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ATH5K_ANI_MODE_MANUAL_LOW = 1,
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ATH5K_ANI_MODE_MANUAL_HIGH = 2,
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ATH5K_ANI_MODE_AUTO = 3
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};
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/**
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* struct ath5k_ani_state - ANI state and associated counters
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*
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* @max_spur_level: the maximum spur level is chip dependent
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*/
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struct ath5k_ani_state {
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enum ath5k_ani_mode ani_mode;
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/* state */
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int noise_imm_level;
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int spur_level;
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int firstep_level;
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bool ofdm_weak_sig;
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bool cck_weak_sig;
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int max_spur_level;
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/* used by the algorithm */
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unsigned int listen_time;
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unsigned int ofdm_errors;
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unsigned int cck_errors;
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/* debug/statistics only: numbers from last ANI calibration */
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unsigned int pfc_tx;
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unsigned int pfc_rx;
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unsigned int pfc_busy;
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unsigned int pfc_cycles;
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unsigned int last_listen;
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unsigned int last_ofdm_errors;
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unsigned int last_cck_errors;
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unsigned int sum_ofdm_errors;
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unsigned int sum_cck_errors;
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};
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void ath5k_ani_init(struct ath5k_hw *ah, enum ath5k_ani_mode mode);
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void ath5k_ani_mib_intr(struct ath5k_hw *ah);
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void ath5k_ani_calibration(struct ath5k_hw *ah);
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void ath5k_ani_phy_error_report(struct ath5k_hw *ah,
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enum ath5k_phy_error_code phyerr);
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/* for manual control */
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void ath5k_ani_set_noise_immunity_level(struct ath5k_hw *ah, int level);
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void ath5k_ani_set_spur_immunity_level(struct ath5k_hw *ah, int level);
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void ath5k_ani_set_firstep_level(struct ath5k_hw *ah, int level);
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void ath5k_ani_set_ofdm_weak_signal_detection(struct ath5k_hw *ah, bool on);
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void ath5k_ani_set_cck_weak_signal_detection(struct ath5k_hw *ah, bool on);
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void ath5k_ani_print_counters(struct ath5k_hw *ah);
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#endif /* ANI_H */
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