linux/net/mac80211/rc80211_pid_debugfs.c
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   1/*
   2 * Copyright 2007, Mattias Nissler <mattias.nissler@gmx.de>
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License version 2 as
   6 * published by the Free Software Foundation.
   7 */
   8
   9#include <linux/spinlock.h>
  10#include <linux/poll.h>
  11#include <linux/netdevice.h>
  12#include <linux/types.h>
  13#include <linux/skbuff.h>
  14
  15#include <net/mac80211.h>
  16#include "rate.h"
  17
  18#include "rc80211_pid.h"
  19
  20static void rate_control_pid_event(struct rc_pid_event_buffer *buf,
  21                                   enum rc_pid_event_type type,
  22                                   union rc_pid_event_data *data)
  23{
  24        struct rc_pid_event *ev;
  25        unsigned long status;
  26
  27        spin_lock_irqsave(&buf->lock, status);
  28        ev = &(buf->ring[buf->next_entry]);
  29        buf->next_entry = (buf->next_entry + 1) % RC_PID_EVENT_RING_SIZE;
  30
  31        ev->timestamp = jiffies;
  32        ev->id = buf->ev_count++;
  33        ev->type = type;
  34        ev->data = *data;
  35
  36        spin_unlock_irqrestore(&buf->lock, status);
  37
  38        wake_up_all(&buf->waitqueue);
  39}
  40
  41void rate_control_pid_event_tx_status(struct rc_pid_event_buffer *buf,
  42                                      struct ieee80211_tx_info *stat)
  43{
  44        union rc_pid_event_data evd;
  45
  46        evd.flags = stat->flags;
  47        memcpy(&evd.tx_status, stat, sizeof(struct ieee80211_tx_info));
  48        rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_STATUS, &evd);
  49}
  50
  51void rate_control_pid_event_rate_change(struct rc_pid_event_buffer *buf,
  52                                               int index, int rate)
  53{
  54        union rc_pid_event_data evd;
  55
  56        evd.index = index;
  57        evd.rate = rate;
  58        rate_control_pid_event(buf, RC_PID_EVENT_TYPE_RATE_CHANGE, &evd);
  59}
  60
  61void rate_control_pid_event_tx_rate(struct rc_pid_event_buffer *buf,
  62                                           int index, int rate)
  63{
  64        union rc_pid_event_data evd;
  65
  66        evd.index = index;
  67        evd.rate = rate;
  68        rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_RATE, &evd);
  69}
  70
  71void rate_control_pid_event_pf_sample(struct rc_pid_event_buffer *buf,
  72                                             s32 pf_sample, s32 prop_err,
  73                                             s32 int_err, s32 der_err)
  74{
  75        union rc_pid_event_data evd;
  76
  77        evd.pf_sample = pf_sample;
  78        evd.prop_err = prop_err;
  79        evd.int_err = int_err;
  80        evd.der_err = der_err;
  81        rate_control_pid_event(buf, RC_PID_EVENT_TYPE_PF_SAMPLE, &evd);
  82}
  83
  84static int rate_control_pid_events_open(struct inode *inode, struct file *file)
  85{
  86        struct rc_pid_sta_info *sinfo = inode->i_private;
  87        struct rc_pid_event_buffer *events = &sinfo->events;
  88        struct rc_pid_events_file_info *file_info;
  89        unsigned long status;
  90
  91        /* Allocate a state struct */
  92        file_info = kmalloc(sizeof(*file_info), GFP_KERNEL);
  93        if (file_info == NULL)
  94                return -ENOMEM;
  95
  96        spin_lock_irqsave(&events->lock, status);
  97
  98        file_info->next_entry = events->next_entry;
  99        file_info->events = events;
 100
 101        spin_unlock_irqrestore(&events->lock, status);
 102
 103        file->private_data = file_info;
 104
 105        return 0;
 106}
 107
 108static int rate_control_pid_events_release(struct inode *inode,
 109                                           struct file *file)
 110{
 111        struct rc_pid_events_file_info *file_info = file->private_data;
 112
 113        kfree(file_info);
 114
 115        return 0;
 116}
 117
 118static unsigned int rate_control_pid_events_poll(struct file *file,
 119                                                 poll_table *wait)
 120{
 121        struct rc_pid_events_file_info *file_info = file->private_data;
 122
 123        poll_wait(file, &file_info->events->waitqueue, wait);
 124
 125        return POLLIN | POLLRDNORM;
 126}
 127
 128#define RC_PID_PRINT_BUF_SIZE 64
 129
 130static ssize_t rate_control_pid_events_read(struct file *file, char __user *buf,
 131                                            size_t length, loff_t *offset)
 132{
 133        struct rc_pid_events_file_info *file_info = file->private_data;
 134        struct rc_pid_event_buffer *events = file_info->events;
 135        struct rc_pid_event *ev;
 136        char pb[RC_PID_PRINT_BUF_SIZE];
 137        int ret;
 138        int p;
 139        unsigned long status;
 140
 141        /* Check if there is something to read. */
 142        if (events->next_entry == file_info->next_entry) {
 143                if (file->f_flags & O_NONBLOCK)
 144                        return -EAGAIN;
 145
 146                /* Wait */
 147                ret = wait_event_interruptible(events->waitqueue,
 148                                events->next_entry != file_info->next_entry);
 149
 150                if (ret)
 151                        return ret;
 152        }
 153
 154        /* Write out one event per call. I don't care whether it's a little
 155         * inefficient, this is debugging code anyway. */
 156        spin_lock_irqsave(&events->lock, status);
 157
 158        /* Get an event */
 159        ev = &(events->ring[file_info->next_entry]);
 160        file_info->next_entry = (file_info->next_entry + 1) %
 161                                RC_PID_EVENT_RING_SIZE;
 162
 163        /* Print information about the event. Note that userpace needs to
 164         * provide large enough buffers. */
 165        length = length < RC_PID_PRINT_BUF_SIZE ?
 166                 length : RC_PID_PRINT_BUF_SIZE;
 167        p = snprintf(pb, length, "%u %lu ", ev->id, ev->timestamp);
 168        switch (ev->type) {
 169        case RC_PID_EVENT_TYPE_TX_STATUS:
 170                p += snprintf(pb + p, length - p, "tx_status %u %u",
 171                              !(ev->data.flags & IEEE80211_TX_STAT_ACK),
 172                              ev->data.tx_status.status.rates[0].idx);
 173                break;
 174        case RC_PID_EVENT_TYPE_RATE_CHANGE:
 175                p += snprintf(pb + p, length - p, "rate_change %d %d",
 176                              ev->data.index, ev->data.rate);
 177                break;
 178        case RC_PID_EVENT_TYPE_TX_RATE:
 179                p += snprintf(pb + p, length - p, "tx_rate %d %d",
 180                              ev->data.index, ev->data.rate);
 181                break;
 182        case RC_PID_EVENT_TYPE_PF_SAMPLE:
 183                p += snprintf(pb + p, length - p,
 184                              "pf_sample %d %d %d %d",
 185                              ev->data.pf_sample, ev->data.prop_err,
 186                              ev->data.int_err, ev->data.der_err);
 187                break;
 188        }
 189        p += snprintf(pb + p, length - p, "\n");
 190
 191        spin_unlock_irqrestore(&events->lock, status);
 192
 193        if (copy_to_user(buf, pb, p))
 194                return -EFAULT;
 195
 196        return p;
 197}
 198
 199#undef RC_PID_PRINT_BUF_SIZE
 200
 201static struct file_operations rc_pid_fop_events = {
 202        .owner = THIS_MODULE,
 203        .read = rate_control_pid_events_read,
 204        .poll = rate_control_pid_events_poll,
 205        .open = rate_control_pid_events_open,
 206        .release = rate_control_pid_events_release,
 207};
 208
 209void rate_control_pid_add_sta_debugfs(void *priv, void *priv_sta,
 210                                             struct dentry *dir)
 211{
 212        struct rc_pid_sta_info *spinfo = priv_sta;
 213
 214        spinfo->events_entry = debugfs_create_file("rc_pid_events", S_IRUGO,
 215                                                   dir, spinfo,
 216                                                   &rc_pid_fop_events);
 217}
 218
 219void rate_control_pid_remove_sta_debugfs(void *priv, void *priv_sta)
 220{
 221        struct rc_pid_sta_info *spinfo = priv_sta;
 222
 223        debugfs_remove(spinfo->events_entry);
 224}
 225