Commit 1946b74c authored by Mattias Nissler's avatar Mattias Nissler Committed by David S. Miller
Browse files

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: default avatarMattias Nissler <mattias.nissler@gmx.de>
Signed-off-by: default avatarStefano Brivio <stefano.brivio@polimi.it>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 12446c67
......@@ -119,6 +119,20 @@ struct rc_pid_events_file_info {
unsigned int next_entry;
};
struct rc_pid_debugfs_entries {
struct dentry *dir;
struct dentry *target;
struct dentry *sampling_period;
struct dentry *coeff_p;
struct dentry *coeff_i;
struct dentry *coeff_d;
struct dentry *smoothing_shift;
struct dentry *sharpen_factor;
struct dentry *sharpen_duration;
struct dentry *norm_offset;
struct dentry *fast_start;
};
void rate_control_pid_event_tx_status(struct rc_pid_event_buffer *buf,
struct ieee80211_tx_status *stat);
......@@ -222,8 +236,8 @@ struct rc_pid_info {
/* Exponential averaging shift. */
unsigned int smoothing_shift;
/* Sharpening shift and duration. */
unsigned int sharpen_shift;
/* Sharpening factor and duration. */
unsigned int sharpen_factor;
unsigned int sharpen_duration;
/* Normalization offset. */
......@@ -237,6 +251,11 @@ struct rc_pid_info {
/* Index of the last used rate. */
int oldrate;
#ifdef CONFIG_MAC80211_DEBUGFS
/* Debugfs entries created for the parameters above. */
struct rc_pid_debugfs_entries dentries;
#endif
};
#endif /* RC80211_PID_H */
......@@ -139,19 +139,20 @@ static void rate_control_pid_adjust_rate(struct ieee80211_local *local,
}
/* Normalize the failed frames per-rate differences. */
static void rate_control_pid_normalize(struct rc_pid_rateinfo *r, int l)
static void rate_control_pid_normalize(struct rc_pid_info *pinfo, int l)
{
int i;
int i, norm_offset = pinfo->norm_offset;
struct rc_pid_rateinfo *r = pinfo->rinfo;
if (r[0].diff > RC_PID_NORM_OFFSET)
r[0].diff -= RC_PID_NORM_OFFSET;
else if (r[0].diff < -RC_PID_NORM_OFFSET)
r[0].diff += RC_PID_NORM_OFFSET;
if (r[0].diff > norm_offset)
r[0].diff -= norm_offset;
else if (r[0].diff < -norm_offset)
r[0].diff += norm_offset;
for (i = 0; i < l - 1; i++)
if (r[i + 1].diff > r[i].diff + RC_PID_NORM_OFFSET)
r[i + 1].diff -= RC_PID_NORM_OFFSET;
if (r[i + 1].diff > r[i].diff + norm_offset)
r[i + 1].diff -= norm_offset;
else if (r[i + 1].diff <= r[i].diff)
r[i + 1].diff += RC_PID_NORM_OFFSET;
r[i + 1].diff += norm_offset;
}
static void rate_control_pid_sample(struct rc_pid_info *pinfo,
......@@ -163,18 +164,22 @@ static void rate_control_pid_sample(struct rc_pid_info *pinfo,
struct ieee80211_hw_mode *mode;
u32 pf;
s32 err_avg;
s32 err_prop;
s32 err_int;
s32 err_der;
u32 err_prop;
u32 err_int;
u32 err_der;
int adj, i, j, tmp;
unsigned long period;
mode = local->oper_hw_mode;
spinfo = sta->rate_ctrl_priv;
/* In case nothing happened during the previous control interval, turn
* the sharpening factor on. */
if (jiffies - spinfo->last_sample > 2 * RC_PID_INTERVAL)
spinfo->sharp_cnt = RC_PID_SHARPENING_DURATION;
period = (HZ * pinfo->sampling_period + 500) / 1000;
if (!period)
period = 1;
if (jiffies - spinfo->last_sample > 2 * period)
spinfo->sharp_cnt = pinfo->sharpen_duration;
spinfo->last_sample = jiffies;
......@@ -202,17 +207,17 @@ static void rate_control_pid_sample(struct rc_pid_info *pinfo,
rinfo[j].diff = rinfo[i].diff + tmp;
pinfo->oldrate = sta->txrate;
}
rate_control_pid_normalize(rinfo, mode->num_rates);
rate_control_pid_normalize(pinfo, mode->num_rates);
/* Compute the proportional, integral and derivative errors. */
err_prop = RC_PID_TARGET_PF - pf;
err_prop = pinfo->target - pf;
err_avg = spinfo->err_avg_sc >> RC_PID_SMOOTHING_SHIFT;
err_avg = spinfo->err_avg_sc >> pinfo->smoothing_shift;
spinfo->err_avg_sc = spinfo->err_avg_sc - err_avg + err_prop;
err_int = spinfo->err_avg_sc >> RC_PID_SMOOTHING_SHIFT;
err_int = spinfo->err_avg_sc >> pinfo->smoothing_shift;
err_der = pf - spinfo->last_pf
* (1 + RC_PID_SHARPENING_FACTOR * spinfo->sharp_cnt);
err_der = (pf - spinfo->last_pf) *
(1 + pinfo->sharpen_factor * spinfo->sharp_cnt);
spinfo->last_pf = pf;
if (spinfo->sharp_cnt)
spinfo->sharp_cnt--;
......@@ -241,6 +246,7 @@ static void rate_control_pid_tx_status(void *priv, struct net_device *dev,
struct rc_pid_info *pinfo = priv;
struct sta_info *sta;
struct rc_pid_sta_info *spinfo;
unsigned long period;
sta = sta_info_get(local, hdr->addr1);
......@@ -285,7 +291,10 @@ static void rate_control_pid_tx_status(void *priv, struct net_device *dev,
sta->tx_num_mpdu_fail += status->retry_count;
/* Update PID controller state. */
if (time_after(jiffies, spinfo->last_sample + RC_PID_INTERVAL))
period = (HZ * pinfo->sampling_period + 500) / 1000;
if (!period)
period = 1;
if (time_after(jiffies, spinfo->last_sample + period))
rate_control_pid_sample(pinfo, local, sta);
sta_info_put(sta);
......@@ -343,6 +352,9 @@ static void *rate_control_pid_alloc(struct ieee80211_local *local)
struct ieee80211_hw_mode *mode;
int i, j, tmp;
bool s;
#ifdef CONFIG_MAC80211_DEBUGFS
struct rc_pid_debugfs_entries *de;
#endif
pinfo = kmalloc(sizeof(*pinfo), GFP_ATOMIC);
if (!pinfo)
......@@ -363,10 +375,10 @@ static void *rate_control_pid_alloc(struct ieee80211_local *local)
for (i = 0; i < mode->num_rates; i++) {
rinfo[i].index = i;
rinfo[i].rev_index = i;
if (RC_PID_FAST_START)
if (pinfo->fast_start)
rinfo[i].diff = 0;
else
rinfo[i].diff = i * RC_PID_NORM_OFFSET;
rinfo[i].diff = i * pinfo->norm_offset;
}
for (i = 1; i < mode->num_rates; i++) {
s = 0;
......@@ -385,18 +397,72 @@ static void *rate_control_pid_alloc(struct ieee80211_local *local)
}
pinfo->target = RC_PID_TARGET_PF;
pinfo->sampling_period = RC_PID_INTERVAL;
pinfo->coeff_p = RC_PID_COEFF_P;
pinfo->coeff_i = RC_PID_COEFF_I;
pinfo->coeff_d = RC_PID_COEFF_D;
pinfo->smoothing_shift = RC_PID_SMOOTHING_SHIFT;
pinfo->sharpen_factor = RC_PID_SHARPENING_FACTOR;
pinfo->sharpen_duration = RC_PID_SHARPENING_DURATION;
pinfo->norm_offset = RC_PID_NORM_OFFSET;
pinfo->fast_start = RC_PID_FAST_START;
pinfo->rinfo = rinfo;
pinfo->oldrate = 0;
#ifdef CONFIG_MAC80211_DEBUGFS
de = &pinfo->dentries;
de->dir = debugfs_create_dir("rc80211_pid",
local->hw.wiphy->debugfsdir);
de->target = debugfs_create_u32("target_pf", S_IRUSR | S_IWUSR,
de->dir, &pinfo->target);
de->sampling_period = debugfs_create_u32("sampling_period",
S_IRUSR | S_IWUSR, de->dir,
&pinfo->sampling_period);
de->coeff_p = debugfs_create_u32("coeff_p", S_IRUSR | S_IWUSR,
de->dir, &pinfo->coeff_p);
de->coeff_i = debugfs_create_u32("coeff_i", S_IRUSR | S_IWUSR,
de->dir, &pinfo->coeff_i);
de->coeff_d = debugfs_create_u32("coeff_d", S_IRUSR | S_IWUSR,
de->dir, &pinfo->coeff_d);
de->smoothing_shift = debugfs_create_u32("smoothing_shift",
S_IRUSR | S_IWUSR, de->dir,
&pinfo->smoothing_shift);
de->sharpen_factor = debugfs_create_u32("sharpen_factor",
S_IRUSR | S_IWUSR, de->dir,
&pinfo->sharpen_factor);
de->sharpen_duration = debugfs_create_u32("sharpen_duration",
S_IRUSR | S_IWUSR, de->dir,
&pinfo->sharpen_duration);
de->norm_offset = debugfs_create_u32("norm_offset",
S_IRUSR | S_IWUSR, de->dir,
&pinfo->norm_offset);
de->fast_start = debugfs_create_bool("fast_start",
S_IRUSR | S_IWUSR, de->dir,
&pinfo->fast_start);
#endif
return pinfo;
}
static void rate_control_pid_free(void *priv)
{
struct rc_pid_info *pinfo = priv;
#ifdef CONFIG_MAC80211_DEBUGFS
struct rc_pid_debugfs_entries *de = &pinfo->dentries;
debugfs_remove(de->fast_start);
debugfs_remove(de->norm_offset);
debugfs_remove(de->sharpen_duration);
debugfs_remove(de->sharpen_factor);
debugfs_remove(de->smoothing_shift);
debugfs_remove(de->coeff_d);
debugfs_remove(de->coeff_i);
debugfs_remove(de->coeff_p);
debugfs_remove(de->sampling_period);
debugfs_remove(de->target);
debugfs_remove(de->dir);
#endif
kfree(pinfo->rinfo);
kfree(pinfo);
}
......
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