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rc80211-pid: export tuning parameters through debugfs
This adds all the tunable parameters used by rc80211_pid to debugfs for easy testing and tuning. Signed-off-by: Mattias Nissler <mattias.nissler@gmx.de> Signed-off-by: Stefano Brivio <stefano.brivio@polimi.it> Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -119,6 +119,20 @@ struct rc_pid_events_file_info {
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unsigned int next_entry;
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};
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struct rc_pid_debugfs_entries {
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struct dentry *dir;
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struct dentry *target;
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struct dentry *sampling_period;
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struct dentry *coeff_p;
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struct dentry *coeff_i;
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struct dentry *coeff_d;
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struct dentry *smoothing_shift;
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struct dentry *sharpen_factor;
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struct dentry *sharpen_duration;
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struct dentry *norm_offset;
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struct dentry *fast_start;
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};
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void rate_control_pid_event_tx_status(struct rc_pid_event_buffer *buf,
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struct ieee80211_tx_status *stat);
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@ -222,8 +236,8 @@ struct rc_pid_info {
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/* Exponential averaging shift. */
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unsigned int smoothing_shift;
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/* Sharpening shift and duration. */
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unsigned int sharpen_shift;
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/* Sharpening factor and duration. */
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unsigned int sharpen_factor;
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unsigned int sharpen_duration;
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/* Normalization offset. */
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@ -237,6 +251,11 @@ struct rc_pid_info {
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/* Index of the last used rate. */
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int oldrate;
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#ifdef CONFIG_MAC80211_DEBUGFS
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/* Debugfs entries created for the parameters above. */
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struct rc_pid_debugfs_entries dentries;
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#endif
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};
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#endif /* RC80211_PID_H */
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@ -139,19 +139,20 @@ static void rate_control_pid_adjust_rate(struct ieee80211_local *local,
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}
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/* Normalize the failed frames per-rate differences. */
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static void rate_control_pid_normalize(struct rc_pid_rateinfo *r, int l)
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static void rate_control_pid_normalize(struct rc_pid_info *pinfo, int l)
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{
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int i;
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int i, norm_offset = pinfo->norm_offset;
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struct rc_pid_rateinfo *r = pinfo->rinfo;
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if (r[0].diff > RC_PID_NORM_OFFSET)
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r[0].diff -= RC_PID_NORM_OFFSET;
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else if (r[0].diff < -RC_PID_NORM_OFFSET)
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r[0].diff += RC_PID_NORM_OFFSET;
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if (r[0].diff > norm_offset)
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r[0].diff -= norm_offset;
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else if (r[0].diff < -norm_offset)
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r[0].diff += norm_offset;
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for (i = 0; i < l - 1; i++)
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if (r[i + 1].diff > r[i].diff + RC_PID_NORM_OFFSET)
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r[i + 1].diff -= RC_PID_NORM_OFFSET;
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if (r[i + 1].diff > r[i].diff + norm_offset)
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r[i + 1].diff -= norm_offset;
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else if (r[i + 1].diff <= r[i].diff)
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r[i + 1].diff += RC_PID_NORM_OFFSET;
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r[i + 1].diff += norm_offset;
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}
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static void rate_control_pid_sample(struct rc_pid_info *pinfo,
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@ -163,18 +164,22 @@ static void rate_control_pid_sample(struct rc_pid_info *pinfo,
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struct ieee80211_hw_mode *mode;
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u32 pf;
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s32 err_avg;
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s32 err_prop;
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s32 err_int;
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s32 err_der;
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u32 err_prop;
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u32 err_int;
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u32 err_der;
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int adj, i, j, tmp;
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unsigned long period;
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mode = local->oper_hw_mode;
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spinfo = sta->rate_ctrl_priv;
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/* In case nothing happened during the previous control interval, turn
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* the sharpening factor on. */
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if (jiffies - spinfo->last_sample > 2 * RC_PID_INTERVAL)
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spinfo->sharp_cnt = RC_PID_SHARPENING_DURATION;
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period = (HZ * pinfo->sampling_period + 500) / 1000;
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if (!period)
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period = 1;
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if (jiffies - spinfo->last_sample > 2 * period)
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spinfo->sharp_cnt = pinfo->sharpen_duration;
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spinfo->last_sample = jiffies;
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@ -202,17 +207,17 @@ static void rate_control_pid_sample(struct rc_pid_info *pinfo,
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rinfo[j].diff = rinfo[i].diff + tmp;
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pinfo->oldrate = sta->txrate;
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}
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rate_control_pid_normalize(rinfo, mode->num_rates);
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rate_control_pid_normalize(pinfo, mode->num_rates);
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/* Compute the proportional, integral and derivative errors. */
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err_prop = RC_PID_TARGET_PF - pf;
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err_prop = pinfo->target - pf;
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err_avg = spinfo->err_avg_sc >> RC_PID_SMOOTHING_SHIFT;
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err_avg = spinfo->err_avg_sc >> pinfo->smoothing_shift;
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spinfo->err_avg_sc = spinfo->err_avg_sc - err_avg + err_prop;
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err_int = spinfo->err_avg_sc >> RC_PID_SMOOTHING_SHIFT;
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err_int = spinfo->err_avg_sc >> pinfo->smoothing_shift;
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err_der = pf - spinfo->last_pf
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* (1 + RC_PID_SHARPENING_FACTOR * spinfo->sharp_cnt);
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err_der = (pf - spinfo->last_pf) *
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(1 + pinfo->sharpen_factor * spinfo->sharp_cnt);
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spinfo->last_pf = pf;
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if (spinfo->sharp_cnt)
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spinfo->sharp_cnt--;
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@ -241,6 +246,7 @@ static void rate_control_pid_tx_status(void *priv, struct net_device *dev,
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struct rc_pid_info *pinfo = priv;
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struct sta_info *sta;
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struct rc_pid_sta_info *spinfo;
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unsigned long period;
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sta = sta_info_get(local, hdr->addr1);
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@ -285,7 +291,10 @@ static void rate_control_pid_tx_status(void *priv, struct net_device *dev,
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sta->tx_num_mpdu_fail += status->retry_count;
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/* Update PID controller state. */
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if (time_after(jiffies, spinfo->last_sample + RC_PID_INTERVAL))
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period = (HZ * pinfo->sampling_period + 500) / 1000;
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if (!period)
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period = 1;
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if (time_after(jiffies, spinfo->last_sample + period))
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rate_control_pid_sample(pinfo, local, sta);
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sta_info_put(sta);
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@ -343,6 +352,9 @@ static void *rate_control_pid_alloc(struct ieee80211_local *local)
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struct ieee80211_hw_mode *mode;
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int i, j, tmp;
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bool s;
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#ifdef CONFIG_MAC80211_DEBUGFS
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struct rc_pid_debugfs_entries *de;
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#endif
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pinfo = kmalloc(sizeof(*pinfo), GFP_ATOMIC);
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if (!pinfo)
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@ -363,10 +375,10 @@ static void *rate_control_pid_alloc(struct ieee80211_local *local)
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for (i = 0; i < mode->num_rates; i++) {
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rinfo[i].index = i;
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rinfo[i].rev_index = i;
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if (RC_PID_FAST_START)
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if (pinfo->fast_start)
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rinfo[i].diff = 0;
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else
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rinfo[i].diff = i * RC_PID_NORM_OFFSET;
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rinfo[i].diff = i * pinfo->norm_offset;
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}
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for (i = 1; i < mode->num_rates; i++) {
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s = 0;
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@ -385,18 +397,72 @@ static void *rate_control_pid_alloc(struct ieee80211_local *local)
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}
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pinfo->target = RC_PID_TARGET_PF;
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pinfo->sampling_period = RC_PID_INTERVAL;
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pinfo->coeff_p = RC_PID_COEFF_P;
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pinfo->coeff_i = RC_PID_COEFF_I;
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pinfo->coeff_d = RC_PID_COEFF_D;
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pinfo->smoothing_shift = RC_PID_SMOOTHING_SHIFT;
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pinfo->sharpen_factor = RC_PID_SHARPENING_FACTOR;
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pinfo->sharpen_duration = RC_PID_SHARPENING_DURATION;
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pinfo->norm_offset = RC_PID_NORM_OFFSET;
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pinfo->fast_start = RC_PID_FAST_START;
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pinfo->rinfo = rinfo;
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pinfo->oldrate = 0;
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#ifdef CONFIG_MAC80211_DEBUGFS
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de = &pinfo->dentries;
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de->dir = debugfs_create_dir("rc80211_pid",
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local->hw.wiphy->debugfsdir);
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de->target = debugfs_create_u32("target_pf", S_IRUSR | S_IWUSR,
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de->dir, &pinfo->target);
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de->sampling_period = debugfs_create_u32("sampling_period",
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S_IRUSR | S_IWUSR, de->dir,
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&pinfo->sampling_period);
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de->coeff_p = debugfs_create_u32("coeff_p", S_IRUSR | S_IWUSR,
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de->dir, &pinfo->coeff_p);
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de->coeff_i = debugfs_create_u32("coeff_i", S_IRUSR | S_IWUSR,
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de->dir, &pinfo->coeff_i);
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de->coeff_d = debugfs_create_u32("coeff_d", S_IRUSR | S_IWUSR,
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de->dir, &pinfo->coeff_d);
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de->smoothing_shift = debugfs_create_u32("smoothing_shift",
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S_IRUSR | S_IWUSR, de->dir,
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&pinfo->smoothing_shift);
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de->sharpen_factor = debugfs_create_u32("sharpen_factor",
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S_IRUSR | S_IWUSR, de->dir,
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&pinfo->sharpen_factor);
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de->sharpen_duration = debugfs_create_u32("sharpen_duration",
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S_IRUSR | S_IWUSR, de->dir,
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&pinfo->sharpen_duration);
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de->norm_offset = debugfs_create_u32("norm_offset",
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S_IRUSR | S_IWUSR, de->dir,
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&pinfo->norm_offset);
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de->fast_start = debugfs_create_bool("fast_start",
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S_IRUSR | S_IWUSR, de->dir,
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&pinfo->fast_start);
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#endif
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return pinfo;
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}
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static void rate_control_pid_free(void *priv)
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{
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struct rc_pid_info *pinfo = priv;
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#ifdef CONFIG_MAC80211_DEBUGFS
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struct rc_pid_debugfs_entries *de = &pinfo->dentries;
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debugfs_remove(de->fast_start);
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debugfs_remove(de->norm_offset);
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debugfs_remove(de->sharpen_duration);
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debugfs_remove(de->sharpen_factor);
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debugfs_remove(de->smoothing_shift);
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debugfs_remove(de->coeff_d);
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debugfs_remove(de->coeff_i);
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debugfs_remove(de->coeff_p);
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debugfs_remove(de->sampling_period);
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debugfs_remove(de->target);
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debugfs_remove(de->dir);
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#endif
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kfree(pinfo->rinfo);
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kfree(pinfo);
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}
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