net/mac80211/debugfs.c

   1 /*
   2  * mac80211 debugfs for wireless PHYs
   3  *
   4  * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
   5  * Copyright 2013-2014  Intel Mobile Communications GmbH
   6  *
   7  * GPLv2
   8  *
   9  */
  10
  11 #include <linux/debugfs.h>
  12 #include <linux/rtnetlink.h>
  13 #include "ieee80211_i.h"
  14 #include "driver-ops.h"
  15 #include "rate.h"
  16 #include "debugfs.h"
  17
  18 #define DEBUGFS_FORMAT_BUFFER_SIZE 100
  19
  20 int mac80211_format_buffer(char __user *userbuf, size_t count,
  21                                   loff_t *ppos, char *fmt, ...)
  22 {
  23         va_list args;
  24         char buf[DEBUGFS_FORMAT_BUFFER_SIZE];
  25         int res;
  26
  27         va_start(args, fmt);
  28         res = vscnprintf(buf, sizeof(buf), fmt, args);
  29         va_end(args);
  30
  31         return simple_read_from_buffer(userbuf, count, ppos, buf, res);
  32 }
  33
  34 #define DEBUGFS_READONLY_FILE_FN(name, fmt, value...)                   \
  35 static ssize_t name## _read(struct file *file, char __user *userbuf,    \
  36                             size_t count, loff_t *ppos)                 \
  37 {                                                                       \
  38         struct ieee80211_local *local = file->private_data;             \
  39                                                                         \
  40         return mac80211_format_buffer(userbuf, count, ppos,             \
  41                                       fmt "\n", ##value);               \
  42 }
  43
  44 #define DEBUGFS_READONLY_FILE_OPS(name)                 \
  45 static const struct file_operations name## _ops = {                     \
  46         .read = name## _read,                                           \
  47         .open = simple_open,                                            \
  48         .llseek = generic_file_llseek,                                  \
  49 };
  50
  51 #define DEBUGFS_READONLY_FILE(name, fmt, value...)              \
  52         DEBUGFS_READONLY_FILE_FN(name, fmt, value)              \
  53         DEBUGFS_READONLY_FILE_OPS(name)
  54
  55 #define DEBUGFS_ADD(name)                                               \
  56         debugfs_create_file(#name, 0400, phyd, local, &name## _ops);
  57
  58 #define DEBUGFS_ADD_MODE(name, mode)                                    \
  59         debugfs_create_file(#name, mode, phyd, local, &name## _ops);
  60
  61
  62 DEBUGFS_READONLY_FILE(user_power, "%d",
  63                       local->user_power_level);
  64 DEBUGFS_READONLY_FILE(power, "%d",
  65                       local->hw.conf.power_level);
  66 DEBUGFS_READONLY_FILE(total_ps_buffered, "%d",
  67                       local->total_ps_buffered);
  68 DEBUGFS_READONLY_FILE(wep_iv, "%#08x",
  69                       local->wep_iv & 0xffffff);
  70 DEBUGFS_READONLY_FILE(rate_ctrl_alg, "%s",
  71         local->rate_ctrl ? local->rate_ctrl->ops->name : "hw/driver");
  72
  73 #ifdef CONFIG_PM
  74 static ssize_t reset_write(struct file *file, const char __user *user_buf,
  75                            size_t count, loff_t *ppos)
  76 {
  77         struct ieee80211_local *local = file->private_data;
  78
  79         rtnl_lock();
  80         __ieee80211_suspend(&local->hw, NULL);
  81         __ieee80211_resume(&local->hw);
  82         rtnl_unlock();
  83
  84         return count;
  85 }
  86
  87 static const struct file_operations reset_ops = {
  88         .write = reset_write,
  89         .open = simple_open,
  90         .llseek = noop_llseek,
  91 };
  92 #endif
  93
  94 static const char *hw_flag_names[NUM_IEEE80211_HW_FLAGS + 1] = {
  95 #define FLAG(F) [IEEE80211_HW_##F] = #F
  96         FLAG(HAS_RATE_CONTROL),
  97         FLAG(RX_INCLUDES_FCS),
  98         FLAG(HOST_BROADCAST_PS_BUFFERING),
  99         FLAG(SIGNAL_UNSPEC),
 100         FLAG(SIGNAL_DBM),
 101         FLAG(NEED_DTIM_BEFORE_ASSOC),
 102         FLAG(SPECTRUM_MGMT),
 103         FLAG(AMPDU_AGGREGATION),
 104         FLAG(SUPPORTS_PS),
 105         FLAG(PS_NULLFUNC_STACK),
 106         FLAG(SUPPORTS_DYNAMIC_PS),
 107         FLAG(MFP_CAPABLE),
 108         FLAG(WANT_MONITOR_VIF),
 109         FLAG(NO_AUTO_VIF),
 110         FLAG(SW_CRYPTO_CONTROL),
 111         FLAG(SUPPORT_FAST_XMIT),
 112         FLAG(REPORTS_TX_ACK_STATUS),
 113         FLAG(CONNECTION_MONITOR),
 114         FLAG(QUEUE_CONTROL),
 115         FLAG(SUPPORTS_PER_STA_GTK),
 116         FLAG(AP_LINK_PS),
 117         FLAG(TX_AMPDU_SETUP_IN_HW),
 118         FLAG(SUPPORTS_RC_TABLE),
 119         FLAG(P2P_DEV_ADDR_FOR_INTF),
 120         FLAG(TIMING_BEACON_ONLY),
 121         FLAG(SUPPORTS_HT_CCK_RATES),
 122         FLAG(CHANCTX_STA_CSA),
 123         FLAG(SUPPORTS_CLONED_SKBS),
 124         FLAG(SINGLE_SCAN_ON_ALL_BANDS),
 125         FLAG(TDLS_WIDER_BW),
 126
 127         /* keep last for the build bug below */
 128         (void *)0x1
 129 #undef FLAG
 130 };
 131
 132 static ssize_t hwflags_read(struct file *file, char __user *user_buf,
 133                             size_t count, loff_t *ppos)
 134 {
 135         struct ieee80211_local *local = file->private_data;
 136         size_t bufsz = 30 * NUM_IEEE80211_HW_FLAGS;
 137         char *buf = kzalloc(bufsz, GFP_KERNEL);
 138         char *pos = buf, *end = buf + bufsz - 1;
 139         ssize_t rv;
 140         int i;
 141
 142         if (!buf)
 143                 return -ENOMEM;
 144
 145         /* fail compilation if somebody adds or removes
 146          * a flag without updating the name array above
 147          */
 148         BUILD_BUG_ON(hw_flag_names[NUM_IEEE80211_HW_FLAGS] != (void *)0x1);
 149
 150         for (i = 0; i < NUM_IEEE80211_HW_FLAGS; i++) {
 151                 if (test_bit(i, local->hw.flags))
 152                         pos += scnprintf(pos, end - pos, "%s\n",
 153                                          hw_flag_names[i]);
 154         }
 155
 156         rv = simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
 157         kfree(buf);
 158         return rv;
 159 }
 160
 161 static ssize_t queues_read(struct file *file, char __user *user_buf,
 162                            size_t count, loff_t *ppos)
 163 {
 164         struct ieee80211_local *local = file->private_data;
 165         unsigned long flags;
 166         char buf[IEEE80211_MAX_QUEUES * 20];
 167         int q, res = 0;
 168
 169         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 170         for (q = 0; q < local->hw.queues; q++)
 171                 res += sprintf(buf + res, "%02d: %#.8lx/%d\n", q,
 172                                 local->queue_stop_reasons[q],
 173                                 skb_queue_len(&local->pending[q]));
 174         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 175
 176         return simple_read_from_buffer(user_buf, count, ppos, buf, res);
 177 }
 178
 179 DEBUGFS_READONLY_FILE_OPS(hwflags);
 180 DEBUGFS_READONLY_FILE_OPS(queues);
 181
 182 /* statistics stuff */
 183
 184 static ssize_t format_devstat_counter(struct ieee80211_local *local,
 185         char __user *userbuf,
 186         size_t count, loff_t *ppos,
 187         int (*printvalue)(struct ieee80211_low_level_stats *stats, char *buf,
 188                           int buflen))
 189 {
 190         struct ieee80211_low_level_stats stats;
 191         char buf[20];
 192         int res;
 193
 194         rtnl_lock();
 195         res = drv_get_stats(local, &stats);
 196         rtnl_unlock();
 197         if (res)
 198                 return res;
 199         res = printvalue(&stats, buf, sizeof(buf));
 200         return simple_read_from_buffer(userbuf, count, ppos, buf, res);
 201 }
 202
 203 #define DEBUGFS_DEVSTATS_FILE(name)                                     \
 204 static int print_devstats_##name(struct ieee80211_low_level_stats *stats,\
 205                                  char *buf, int buflen)                 \
 206 {                                                                       \
 207         return scnprintf(buf, buflen, "%u\n", stats->name);             \
 208 }                                                                       \
 209 static ssize_t stats_ ##name## _read(struct file *file,                 \
 210                                      char __user *userbuf,              \
 211                                      size_t count, loff_t *ppos)        \
 212 {                                                                       \
 213         return format_devstat_counter(file->private_data,               \
 214                                       userbuf,                          \
 215                                       count,                            \
 216                                       ppos,                             \
 217                                       print_devstats_##name);           \
 218 }                                                                       \
 219                                                                         \
 220 static const struct file_operations stats_ ##name## _ops = {            \
 221         .read = stats_ ##name## _read,                                  \
 222         .open = simple_open,                                            \
 223         .llseek = generic_file_llseek,                                  \
 224 };
 225
 226 #define DEBUGFS_STATS_ADD(name)                                 \
 227         debugfs_create_u32(#name, 0400, statsd, &local->name);
 228 #define DEBUGFS_DEVSTATS_ADD(name)                                      \
 229         debugfs_create_file(#name, 0400, statsd, local, &stats_ ##name## _ops);
 230
 231 DEBUGFS_DEVSTATS_FILE(dot11ACKFailureCount);
 232 DEBUGFS_DEVSTATS_FILE(dot11RTSFailureCount);
 233 DEBUGFS_DEVSTATS_FILE(dot11FCSErrorCount);
 234 DEBUGFS_DEVSTATS_FILE(dot11RTSSuccessCount);
 235
 236 void debugfs_hw_add(struct ieee80211_local *local)
 237 {
 238         struct dentry *phyd = local->hw.wiphy->debugfsdir;
 239         struct dentry *statsd;
 240
 241         if (!phyd)
 242                 return;
 243
 244         local->debugfs.keys = debugfs_create_dir("keys", phyd);
 245
 246         DEBUGFS_ADD(total_ps_buffered);
 247         DEBUGFS_ADD(wep_iv);
 248         DEBUGFS_ADD(queues);
 249 #ifdef CONFIG_PM
 250         DEBUGFS_ADD_MODE(reset, 0200);
 251 #endif
 252         DEBUGFS_ADD(hwflags);
 253         DEBUGFS_ADD(user_power);
 254         DEBUGFS_ADD(power);
 255
 256         statsd = debugfs_create_dir("statistics", phyd);
 257
 258         /* if the dir failed, don't put all the other things into the root! */
 259         if (!statsd)
 260                 return;
 261
 262 #ifdef CONFIG_MAC80211_DEBUG_COUNTERS
 263         DEBUGFS_STATS_ADD(dot11TransmittedFragmentCount);
 264         DEBUGFS_STATS_ADD(dot11MulticastTransmittedFrameCount);
 265         DEBUGFS_STATS_ADD(dot11FailedCount);
 266         DEBUGFS_STATS_ADD(dot11RetryCount);
 267         DEBUGFS_STATS_ADD(dot11MultipleRetryCount);
 268         DEBUGFS_STATS_ADD(dot11FrameDuplicateCount);
 269         DEBUGFS_STATS_ADD(dot11ReceivedFragmentCount);
 270         DEBUGFS_STATS_ADD(dot11MulticastReceivedFrameCount);
 271         DEBUGFS_STATS_ADD(dot11TransmittedFrameCount);
 272         DEBUGFS_STATS_ADD(tx_handlers_drop);
 273         DEBUGFS_STATS_ADD(tx_handlers_queued);
 274         DEBUGFS_STATS_ADD(tx_handlers_drop_wep);
 275         DEBUGFS_STATS_ADD(tx_handlers_drop_not_assoc);
 276         DEBUGFS_STATS_ADD(tx_handlers_drop_unauth_port);
 277         DEBUGFS_STATS_ADD(rx_handlers_drop);
 278         DEBUGFS_STATS_ADD(rx_handlers_queued);
 279         DEBUGFS_STATS_ADD(rx_handlers_drop_nullfunc);
 280         DEBUGFS_STATS_ADD(rx_handlers_drop_defrag);
 281         DEBUGFS_STATS_ADD(tx_expand_skb_head);
 282         DEBUGFS_STATS_ADD(tx_expand_skb_head_cloned);
 283         DEBUGFS_STATS_ADD(rx_expand_skb_head_defrag);
 284         DEBUGFS_STATS_ADD(rx_handlers_fragments);
 285         DEBUGFS_STATS_ADD(tx_status_drop);
 286 #endif
 287         DEBUGFS_DEVSTATS_ADD(dot11ACKFailureCount);
 288         DEBUGFS_DEVSTATS_ADD(dot11RTSFailureCount);
 289         DEBUGFS_DEVSTATS_ADD(dot11FCSErrorCount);
 290         DEBUGFS_DEVSTATS_ADD(dot11RTSSuccessCount);
 291 }