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00009 #include <linux/sched.h>
00010 #include <linux/spinlock.h>
00011 #include <linux/poll.h>
00012 #include <linux/netdevice.h>
00013 #include <linux/types.h>
00014 #include <linux/skbuff.h>
00015 #include <linux/slab.h>
00016 #include <linux/export.h>
00017
00018 #include <net/mac80211.h>
00019 #include "rate.h"
00020
00021 #include "rc80211_pid.h"
00022
00023 static void rate_control_pid_event(struct rc_pid_event_buffer *buf,
00024 enum rc_pid_event_type type,
00025 union rc_pid_event_data *data)
00026 {
00027 struct rc_pid_event *ev;
00028 unsigned long status;
00029
00030 spin_lock_irqsave(&buf->lock, status);
00031 ev = &(buf->ring[buf->next_entry]);
00032 buf->next_entry = (buf->next_entry + 1) % RC_PID_EVENT_RING_SIZE;
00033
00034 ev->timestamp = jiffies;
00035 ev->id = buf->ev_count++;
00036 ev->type = type;
00037 ev->data = *data;
00038
00039 spin_unlock_irqrestore(&buf->lock, status);
00040
00041 wake_up_all(&buf->waitqueue);
00042 }
00043
00044 void rate_control_pid_event_tx_status(struct rc_pid_event_buffer *buf,
00045 struct ieee80211_tx_info *stat)
00046 {
00047 union rc_pid_event_data evd;
00048
00049 evd.flags = stat->flags;
00050 memcpy(&evd.tx_status, stat, sizeof(struct ieee80211_tx_info));
00051 rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_STATUS, &evd);
00052 }
00053
00054 void rate_control_pid_event_rate_change(struct rc_pid_event_buffer *buf,
00055 int index, int rate)
00056 {
00057 union rc_pid_event_data evd;
00058
00059 evd.index = index;
00060 evd.rate = rate;
00061 rate_control_pid_event(buf, RC_PID_EVENT_TYPE_RATE_CHANGE, &evd);
00062 }
00063
00064 void rate_control_pid_event_tx_rate(struct rc_pid_event_buffer *buf,
00065 int index, int rate)
00066 {
00067 union rc_pid_event_data evd;
00068
00069 evd.index = index;
00070 evd.rate = rate;
00071 rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_RATE, &evd);
00072 }
00073
00074 void rate_control_pid_event_pf_sample(struct rc_pid_event_buffer *buf,
00075 s32 pf_sample, s32 prop_err,
00076 s32 int_err, s32 der_err)
00077 {
00078 union rc_pid_event_data evd;
00079
00080 evd.pf_sample = pf_sample;
00081 evd.prop_err = prop_err;
00082 evd.int_err = int_err;
00083 evd.der_err = der_err;
00084 rate_control_pid_event(buf, RC_PID_EVENT_TYPE_PF_SAMPLE, &evd);
00085 }
00086
00087 static int rate_control_pid_events_open(struct inode *inode, struct file *file)
00088 {
00089 struct rc_pid_sta_info *sinfo = inode->i_private;
00090 struct rc_pid_event_buffer *events = &sinfo->events;
00091 struct rc_pid_events_file_info *file_info;
00092 unsigned long status;
00093
00094
00095 file_info = kmalloc(sizeof(*file_info), GFP_KERNEL);
00096 if (file_info == NULL)
00097 return -ENOMEM;
00098
00099 spin_lock_irqsave(&events->lock, status);
00100
00101 file_info->next_entry = events->next_entry;
00102 file_info->events = events;
00103
00104 spin_unlock_irqrestore(&events->lock, status);
00105
00106 file->private_data = file_info;
00107
00108 return 0;
00109 }
00110
00111 static int rate_control_pid_events_release(struct inode *inode,
00112 struct file *file)
00113 {
00114 struct rc_pid_events_file_info *file_info = file->private_data;
00115
00116 kfree(file_info);
00117
00118 return 0;
00119 }
00120
00121 static unsigned int rate_control_pid_events_poll(struct file *file,
00122 poll_table *wait)
00123 {
00124 struct rc_pid_events_file_info *file_info = file->private_data;
00125
00126 poll_wait(file, &file_info->events->waitqueue, wait);
00127
00128 return POLLIN | POLLRDNORM;
00129 }
00130
00131 #define RC_PID_PRINT_BUF_SIZE 64
00132
00133 static ssize_t rate_control_pid_events_read(struct file *file, char __user *buf,
00134 size_t length, loff_t *offset)
00135 {
00136 struct rc_pid_events_file_info *file_info = file->private_data;
00137 struct rc_pid_event_buffer *events = file_info->events;
00138 struct rc_pid_event *ev;
00139 char pb[RC_PID_PRINT_BUF_SIZE];
00140 int ret;
00141 int p;
00142 unsigned long status;
00143
00144
00145 if (events->next_entry == file_info->next_entry) {
00146 if (file->f_flags & O_NONBLOCK)
00147 return -EAGAIN;
00148
00149
00150 ret = wait_event_interruptible(events->waitqueue,
00151 events->next_entry != file_info->next_entry);
00152
00153 if (ret)
00154 return ret;
00155 }
00156
00157
00158
00159 spin_lock_irqsave(&events->lock, status);
00160
00161
00162 ev = &(events->ring[file_info->next_entry]);
00163 file_info->next_entry = (file_info->next_entry + 1) %
00164 RC_PID_EVENT_RING_SIZE;
00165
00166
00167
00168 length = length < RC_PID_PRINT_BUF_SIZE ?
00169 length : RC_PID_PRINT_BUF_SIZE;
00170 p = snprintf(pb, length, "%u %lu ", ev->id, ev->timestamp);
00171 switch (ev->type) {
00172 case RC_PID_EVENT_TYPE_TX_STATUS:
00173 p += snprintf(pb + p, length - p, "tx_status %u %u",
00174 !(ev->data.flags & IEEE80211_TX_STAT_ACK),
00175 ev->data.tx_status.status.rates[0].idx);
00176 break;
00177 case RC_PID_EVENT_TYPE_RATE_CHANGE:
00178 p += snprintf(pb + p, length - p, "rate_change %d %d",
00179 ev->data.index, ev->data.rate);
00180 break;
00181 case RC_PID_EVENT_TYPE_TX_RATE:
00182 p += snprintf(pb + p, length - p, "tx_rate %d %d",
00183 ev->data.index, ev->data.rate);
00184 break;
00185 case RC_PID_EVENT_TYPE_PF_SAMPLE:
00186 p += snprintf(pb + p, length - p,
00187 "pf_sample %d %d %d %d",
00188 ev->data.pf_sample, ev->data.prop_err,
00189 ev->data.int_err, ev->data.der_err);
00190 break;
00191 }
00192 p += snprintf(pb + p, length - p, "\n");
00193
00194 spin_unlock_irqrestore(&events->lock, status);
00195
00196 if (copy_to_user(buf, pb, p))
00197 return -EFAULT;
00198
00199 return p;
00200 }
00201
00202 #undef RC_PID_PRINT_BUF_SIZE
00203
00204 static const struct file_operations rc_pid_fop_events = {
00205 .owner = THIS_MODULE,
00206 .read = rate_control_pid_events_read,
00207 .poll = rate_control_pid_events_poll,
00208 .open = rate_control_pid_events_open,
00209 .release = rate_control_pid_events_release,
00210 .llseek = noop_llseek,
00211 };
00212
00213 void rate_control_pid_add_sta_debugfs(void *priv, void *priv_sta,
00214 struct dentry *dir)
00215 {
00216 struct rc_pid_sta_info *spinfo = priv_sta;
00217
00218 spinfo->events_entry = debugfs_create_file("rc_pid_events", S_IRUGO,
00219 dir, spinfo,
00220 &rc_pid_fop_events);
00221 }
00222
00223 void rate_control_pid_remove_sta_debugfs(void *priv, void *priv_sta)
00224 {
00225 struct rc_pid_sta_info *spinfo = priv_sta;
00226
00227 debugfs_remove(spinfo->events_entry);
00228 }