net/mac80211/debugfs.c

   1
   2 /*
   3  * mac80211 debugfs for wireless PHYs
   4  *
   5  * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
   6  * Copyright 2013-2014  Intel Mobile Communications GmbH
   7  *
   8  * GPLv2
   9  *
  10  */
  11
  12 #include <linux/debugfs.h>
  13 #include <linux/rtnetlink.h>
  14 #include "ieee80211_i.h"
  15 #include "driver-ops.h"
  16 #include "rate.h"
  17 #include "debugfs.h"
  18
  19 #define DEBUGFS_FORMAT_BUFFER_SIZE 100
  20
  21 #define TX_LATENCY_BIN_DELIMTER_C ','
  22 #define TX_LATENCY_BIN_DELIMTER_S ","
  23 #define TX_LATENCY_BINS_DISABLED "enable(bins disabled)\n"
  24 #define TX_LATENCY_DISABLED "disable\n"
  25
  26
  27 /*
  28  * Display if Tx latency statistics & bins are enabled/disabled
  29  */
  30 static ssize_t sta_tx_latency_stat_read(struct file *file,
  31                                         char __user *userbuf,
  32                                         size_t count, loff_t *ppos)
  33 {
  34         struct ieee80211_local *local = file->private_data;
  35         struct ieee80211_tx_latency_bin_ranges  *tx_latency;
  36         char *buf;
  37         int bufsz, i, ret;
  38         int pos = 0;
  39
  40         rcu_read_lock();
  41
  42         tx_latency = rcu_dereference(local->tx_latency);
  43
  44         if (tx_latency && tx_latency->n_ranges) {
  45                 bufsz = tx_latency->n_ranges * 15;
  46                 buf = kzalloc(bufsz, GFP_ATOMIC);
  47                 if (!buf)
  48                         goto err;
  49
  50                 for (i = 0; i < tx_latency->n_ranges; i++)
  51                         pos += scnprintf(buf + pos, bufsz - pos, "%d,",
  52                                          tx_latency->ranges[i]);
  53                 pos += scnprintf(buf + pos, bufsz - pos, "\n");
  54         } else if (tx_latency) {
  55                 bufsz = sizeof(TX_LATENCY_BINS_DISABLED) + 1;
  56                 buf = kzalloc(bufsz, GFP_ATOMIC);
  57                 if (!buf)
  58                         goto err;
  59
  60                 pos += scnprintf(buf + pos, bufsz - pos, "%s\n",
  61                                  TX_LATENCY_BINS_DISABLED);
  62         } else {
  63                 bufsz = sizeof(TX_LATENCY_DISABLED) + 1;
  64                 buf = kzalloc(bufsz, GFP_ATOMIC);
  65                 if (!buf)
  66                         goto err;
  67
  68                 pos += scnprintf(buf + pos, bufsz - pos, "%s\n",
  69                                  TX_LATENCY_DISABLED);
  70         }
  71
  72         rcu_read_unlock();
  73
  74         ret = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
  75         kfree(buf);
  76
  77         return ret;
  78 err:
  79         rcu_read_unlock();
  80         return -ENOMEM;
  81 }
  82
  83 /*
  84  * Receive input from user regarding Tx latency statistics
  85  * The input should indicate if Tx latency statistics and bins are
  86  * enabled/disabled.
  87  * If bins are enabled input should indicate the amount of different bins and
  88  * their ranges. Each bin will count how many Tx frames transmitted within the
  89  * appropriate latency.
  90  * Legal input is:
  91  * a) "enable(bins disabled)" - to enable only general statistics
  92  * b) "a,b,c,d,...z" - to enable general statistics and bins, where all are
  93  * numbers and a < b < c < d.. < z
  94  * c) "disable" - disable all statistics
  95  * NOTE: must configure Tx latency statistics bins before stations connected.
  96  */
  97
  98 static ssize_t sta_tx_latency_stat_write(struct file *file,
  99                                          const char __user *userbuf,
 100                                          size_t count, loff_t *ppos)
 101 {
 102         struct ieee80211_local *local = file->private_data;
 103         char buf[128] = {};
 104         char *bins = buf;
 105         char *token;
 106         int buf_size, i, alloc_size;
 107         int prev_bin = 0;
 108         int n_ranges = 0;
 109         int ret = count;
 110         struct ieee80211_tx_latency_bin_ranges  *tx_latency;
 111
 112         if (sizeof(buf) <= count)
 113                 return -EINVAL;
 114         buf_size = count;
 115         if (copy_from_user(buf, userbuf, buf_size))
 116                 return -EFAULT;
 117
 118         mutex_lock(&local->sta_mtx);
 119
 120         /* cannot change config once we have stations */
 121         if (local->num_sta)
 122                 goto unlock;
 123
 124         tx_latency =
 125                 rcu_dereference_protected(local->tx_latency,
 126                                           lockdep_is_held(&local->sta_mtx));
 127
 128         /* disable Tx statistics */
 129         if (!strcmp(buf, TX_LATENCY_DISABLED)) {
 130                 if (!tx_latency)
 131                         goto unlock;
 132                 RCU_INIT_POINTER(local->tx_latency, NULL);
 133                 synchronize_rcu();
 134                 kfree(tx_latency);
 135                 goto unlock;
 136         }
 137
 138         /* Tx latency already enabled */
 139         if (tx_latency)
 140                 goto unlock;
 141
 142         if (strcmp(TX_LATENCY_BINS_DISABLED, buf)) {
 143                 /* check how many bins and between what ranges user requested */
 144                 token = buf;
 145                 while (*token != '\0') {
 146                         if (*token == TX_LATENCY_BIN_DELIMTER_C)
 147                                 n_ranges++;
 148                         token++;
 149                 }
 150                 n_ranges++;
 151         }
 152
 153         alloc_size = sizeof(struct ieee80211_tx_latency_bin_ranges) +
 154                      n_ranges * sizeof(u32);
 155         tx_latency = kzalloc(alloc_size, GFP_ATOMIC);
 156         if (!tx_latency) {
 157                 ret = -ENOMEM;
 158                 goto unlock;
 159         }
 160         tx_latency->n_ranges = n_ranges;
 161         for (i = 0; i < n_ranges; i++) { /* setting bin ranges */
 162                 token = strsep(&bins, TX_LATENCY_BIN_DELIMTER_S);
 163                 sscanf(token, "%d", &tx_latency->ranges[i]);
 164                 /* bins values should be in ascending order */
 165                 if (prev_bin >= tx_latency->ranges[i]) {
 166                         ret = -EINVAL;
 167                         kfree(tx_latency);
 168                         goto unlock;
 169                 }
 170                 prev_bin = tx_latency->ranges[i];
 171         }
 172         rcu_assign_pointer(local->tx_latency, tx_latency);
 173
 174 unlock:
 175         mutex_unlock(&local->sta_mtx);
 176
 177         return ret;
 178 }
 179
 180 static const struct file_operations stats_tx_latency_ops = {
 181         .write = sta_tx_latency_stat_write,
 182         .read = sta_tx_latency_stat_read,
 183         .open = simple_open,
 184         .llseek = generic_file_llseek,
 185 };
 186
 187 int mac80211_format_buffer(char __user *userbuf, size_t count,
 188                                   loff_t *ppos, char *fmt, ...)
 189 {
 190         va_list args;
 191         char buf[DEBUGFS_FORMAT_BUFFER_SIZE];
 192         int res;
 193
 194         va_start(args, fmt);
 195         res = vscnprintf(buf, sizeof(buf), fmt, args);
 196         va_end(args);
 197
 198         return simple_read_from_buffer(userbuf, count, ppos, buf, res);
 199 }
 200
 201 #define DEBUGFS_READONLY_FILE_FN(name, fmt, value...)                   \
 202 static ssize_t name## _read(struct file *file, char __user *userbuf,    \
 203                             size_t count, loff_t *ppos)                 \
 204 {                                                                       \
 205         struct ieee80211_local *local = file->private_data;             \
 206                                                                         \
 207         return mac80211_format_buffer(userbuf, count, ppos,             \
 208                                       fmt "\n", ##value);               \
 209 }
 210
 211 #define DEBUGFS_READONLY_FILE_OPS(name)                 \
 212 static const struct file_operations name## _ops = {                     \
 213         .read = name## _read,                                           \
 214         .open = simple_open,                                            \
 215         .llseek = generic_file_llseek,                                  \
 216 };
 217
 218 #define DEBUGFS_READONLY_FILE(name, fmt, value...)              \
 219         DEBUGFS_READONLY_FILE_FN(name, fmt, value)              \
 220         DEBUGFS_READONLY_FILE_OPS(name)
 221
 222 #define DEBUGFS_ADD(name)                                               \
 223         debugfs_create_file(#name, 0400, phyd, local, &name## _ops);
 224
 225 #define DEBUGFS_ADD_MODE(name, mode)                                    \
 226         debugfs_create_file(#name, mode, phyd, local, &name## _ops);
 227
 228
 229 DEBUGFS_READONLY_FILE(user_power, "%d",
 230                       local->user_power_level);
 231 DEBUGFS_READONLY_FILE(power, "%d",
 232                       local->hw.conf.power_level);
 233 DEBUGFS_READONLY_FILE(total_ps_buffered, "%d",
 234                       local->total_ps_buffered);
 235 DEBUGFS_READONLY_FILE(wep_iv, "%#08x",
 236                       local->wep_iv & 0xffffff);
 237 DEBUGFS_READONLY_FILE(rate_ctrl_alg, "%s",
 238         local->rate_ctrl ? local->rate_ctrl->ops->name : "hw/driver");
 239
 240 #ifdef CONFIG_PM
 241 static ssize_t reset_write(struct file *file, const char __user *user_buf,
 242                            size_t count, loff_t *ppos)
 243 {
 244         struct ieee80211_local *local = file->private_data;
 245
 246         rtnl_lock();
 247         __ieee80211_suspend(&local->hw, NULL);
 248         __ieee80211_resume(&local->hw);
 249         rtnl_unlock();
 250
 251         return count;
 252 }
 253
 254 static const struct file_operations reset_ops = {
 255         .write = reset_write,
 256         .open = simple_open,
 257         .llseek = noop_llseek,
 258 };
 259 #endif
 260
 261 static ssize_t hwflags_read(struct file *file, char __user *user_buf,
 262                             size_t count, loff_t *ppos)
 263 {
 264         struct ieee80211_local *local = file->private_data;
 265         int mxln = 500;
 266         ssize_t rv;
 267         char *buf = kzalloc(mxln, GFP_KERNEL);
 268         int sf = 0; /* how many written so far */
 269
 270         if (!buf)
 271                 return 0;
 272
 273         sf += scnprintf(buf, mxln - sf, "0x%x\n", local->hw.flags);
 274         if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
 275                 sf += scnprintf(buf + sf, mxln - sf, "HAS_RATE_CONTROL\n");
 276         if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
 277                 sf += scnprintf(buf + sf, mxln - sf, "RX_INCLUDES_FCS\n");
 278         if (local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)
 279                 sf += scnprintf(buf + sf, mxln - sf,
 280                                 "HOST_BCAST_PS_BUFFERING\n");
 281         if (local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE)
 282                 sf += scnprintf(buf + sf, mxln - sf,
 283                                 "2GHZ_SHORT_SLOT_INCAPABLE\n");
 284         if (local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE)
 285                 sf += scnprintf(buf + sf, mxln - sf,
 286                                 "2GHZ_SHORT_PREAMBLE_INCAPABLE\n");
 287         if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 288                 sf += scnprintf(buf + sf, mxln - sf, "SIGNAL_UNSPEC\n");
 289         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 290                 sf += scnprintf(buf + sf, mxln - sf, "SIGNAL_DBM\n");
 291         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC)
 292                 sf += scnprintf(buf + sf, mxln - sf,
 293                                 "NEED_DTIM_BEFORE_ASSOC\n");
 294         if (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT)
 295                 sf += scnprintf(buf + sf, mxln - sf, "SPECTRUM_MGMT\n");
 296         if (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)
 297                 sf += scnprintf(buf + sf, mxln - sf, "AMPDU_AGGREGATION\n");
 298         if (local->hw.flags & IEEE80211_HW_SUPPORTS_PS)
 299                 sf += scnprintf(buf + sf, mxln - sf, "SUPPORTS_PS\n");
 300         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
 301                 sf += scnprintf(buf + sf, mxln - sf, "PS_NULLFUNC_STACK\n");
 302         if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
 303                 sf += scnprintf(buf + sf, mxln - sf, "SUPPORTS_DYNAMIC_PS\n");
 304         if (local->hw.flags & IEEE80211_HW_MFP_CAPABLE)
 305                 sf += scnprintf(buf + sf, mxln - sf, "MFP_CAPABLE\n");
 306         if (local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 307                 sf += scnprintf(buf + sf, mxln - sf, "SUPPORTS_UAPSD\n");
 308         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
 309                 sf += scnprintf(buf + sf, mxln - sf,
 310                                 "REPORTS_TX_ACK_STATUS\n");
 311         if (local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
 312                 sf += scnprintf(buf + sf, mxln - sf, "CONNECTION_MONITOR\n");
 313         if (local->hw.flags & IEEE80211_HW_SUPPORTS_PER_STA_GTK)
 314                 sf += scnprintf(buf + sf, mxln - sf, "SUPPORTS_PER_STA_GTK\n");
 315         if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
 316                 sf += scnprintf(buf + sf, mxln - sf, "AP_LINK_PS\n");
 317         if (local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)
 318                 sf += scnprintf(buf + sf, mxln - sf, "TX_AMPDU_SETUP_IN_HW\n");
 319
 320         rv = simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
 321         kfree(buf);
 322         return rv;
 323 }
 324
 325 static ssize_t queues_read(struct file *file, char __user *user_buf,
 326                            size_t count, loff_t *ppos)
 327 {
 328         struct ieee80211_local *local = file->private_data;
 329         unsigned long flags;
 330         char buf[IEEE80211_MAX_QUEUES * 20];
 331         int q, res = 0;
 332
 333         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 334         for (q = 0; q < local->hw.queues; q++)
 335                 res += sprintf(buf + res, "%02d: %#.8lx/%d\n", q,
 336                                 local->queue_stop_reasons[q],
 337                                 skb_queue_len(&local->pending[q]));
 338         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 339
 340         return simple_read_from_buffer(user_buf, count, ppos, buf, res);
 341 }
 342
 343 DEBUGFS_READONLY_FILE_OPS(hwflags);
 344 DEBUGFS_READONLY_FILE_OPS(queues);
 345
 346 /* statistics stuff */
 347
 348 static ssize_t format_devstat_counter(struct ieee80211_local *local,
 349         char __user *userbuf,
 350         size_t count, loff_t *ppos,
 351         int (*printvalue)(struct ieee80211_low_level_stats *stats, char *buf,
 352                           int buflen))
 353 {
 354         struct ieee80211_low_level_stats stats;
 355         char buf[20];
 356         int res;
 357
 358         rtnl_lock();
 359         res = drv_get_stats(local, &stats);
 360         rtnl_unlock();
 361         if (res)
 362                 return res;
 363         res = printvalue(&stats, buf, sizeof(buf));
 364         return simple_read_from_buffer(userbuf, count, ppos, buf, res);
 365 }
 366
 367 #define DEBUGFS_DEVSTATS_FILE(name)                                     \
 368 static int print_devstats_##name(struct ieee80211_low_level_stats *stats,\
 369                                  char *buf, int buflen)                 \
 370 {                                                                       \
 371         return scnprintf(buf, buflen, "%u\n", stats->name);             \
 372 }                                                                       \
 373 static ssize_t stats_ ##name## _read(struct file *file,                 \
 374                                      char __user *userbuf,              \
 375                                      size_t count, loff_t *ppos)        \
 376 {                                                                       \
 377         return format_devstat_counter(file->private_data,               \
 378                                       userbuf,                          \
 379                                       count,                            \
 380                                       ppos,                             \
 381                                       print_devstats_##name);           \
 382 }                                                                       \
 383                                                                         \
 384 static const struct file_operations stats_ ##name## _ops = {            \
 385         .read = stats_ ##name## _read,                                  \
 386         .open = simple_open,                                            \
 387         .llseek = generic_file_llseek,                                  \
 388 };
 389
 390 #define DEBUGFS_STATS_ADD(name, field)                                  \
 391         debugfs_create_u32(#name, 0400, statsd, (u32 *) &field);
 392 #define DEBUGFS_DEVSTATS_ADD(name)                                      \
 393         debugfs_create_file(#name, 0400, statsd, local, &stats_ ##name## _ops);
 394
 395 DEBUGFS_DEVSTATS_FILE(dot11ACKFailureCount);
 396 DEBUGFS_DEVSTATS_FILE(dot11RTSFailureCount);
 397 DEBUGFS_DEVSTATS_FILE(dot11FCSErrorCount);
 398 DEBUGFS_DEVSTATS_FILE(dot11RTSSuccessCount);
 399
 400 void debugfs_hw_add(struct ieee80211_local *local)
 401 {
 402         struct dentry *phyd = local->hw.wiphy->debugfsdir;
 403         struct dentry *statsd;
 404
 405         if (!phyd)
 406                 return;
 407
 408         local->debugfs.keys = debugfs_create_dir("keys", phyd);
 409
 410         DEBUGFS_ADD(total_ps_buffered);
 411         DEBUGFS_ADD(wep_iv);
 412         DEBUGFS_ADD(queues);
 413 #ifdef CONFIG_PM
 414         DEBUGFS_ADD_MODE(reset, 0200);
 415 #endif
 416         DEBUGFS_ADD(hwflags);
 417         DEBUGFS_ADD(user_power);
 418         DEBUGFS_ADD(power);
 419
 420         statsd = debugfs_create_dir("statistics", phyd);
 421
 422         /* if the dir failed, don't put all the other things into the root! */
 423         if (!statsd)
 424                 return;
 425
 426         DEBUGFS_STATS_ADD(transmitted_fragment_count,
 427                 local->dot11TransmittedFragmentCount);
 428         DEBUGFS_STATS_ADD(multicast_transmitted_frame_count,
 429                 local->dot11MulticastTransmittedFrameCount);
 430         DEBUGFS_STATS_ADD(failed_count, local->dot11FailedCount);
 431         DEBUGFS_STATS_ADD(retry_count, local->dot11RetryCount);
 432         DEBUGFS_STATS_ADD(multiple_retry_count,
 433                 local->dot11MultipleRetryCount);
 434         DEBUGFS_STATS_ADD(frame_duplicate_count,
 435                 local->dot11FrameDuplicateCount);
 436         DEBUGFS_STATS_ADD(received_fragment_count,
 437                 local->dot11ReceivedFragmentCount);
 438         DEBUGFS_STATS_ADD(multicast_received_frame_count,
 439                 local->dot11MulticastReceivedFrameCount);
 440         DEBUGFS_STATS_ADD(transmitted_frame_count,
 441                 local->dot11TransmittedFrameCount);
 442 #ifdef CONFIG_MAC80211_DEBUG_COUNTERS
 443         DEBUGFS_STATS_ADD(tx_handlers_drop, local->tx_handlers_drop);
 444         DEBUGFS_STATS_ADD(tx_handlers_queued, local->tx_handlers_queued);
 445         DEBUGFS_STATS_ADD(tx_handlers_drop_unencrypted,
 446                 local->tx_handlers_drop_unencrypted);
 447         DEBUGFS_STATS_ADD(tx_handlers_drop_fragment,
 448                 local->tx_handlers_drop_fragment);
 449         DEBUGFS_STATS_ADD(tx_handlers_drop_wep,
 450                 local->tx_handlers_drop_wep);
 451         DEBUGFS_STATS_ADD(tx_handlers_drop_not_assoc,
 452                 local->tx_handlers_drop_not_assoc);
 453         DEBUGFS_STATS_ADD(tx_handlers_drop_unauth_port,
 454                 local->tx_handlers_drop_unauth_port);
 455         DEBUGFS_STATS_ADD(rx_handlers_drop, local->rx_handlers_drop);
 456         DEBUGFS_STATS_ADD(rx_handlers_queued, local->rx_handlers_queued);
 457         DEBUGFS_STATS_ADD(rx_handlers_drop_nullfunc,
 458                 local->rx_handlers_drop_nullfunc);
 459         DEBUGFS_STATS_ADD(rx_handlers_drop_defrag,
 460                 local->rx_handlers_drop_defrag);
 461         DEBUGFS_STATS_ADD(rx_handlers_drop_short,
 462                 local->rx_handlers_drop_short);
 463         DEBUGFS_STATS_ADD(tx_expand_skb_head,
 464                 local->tx_expand_skb_head);
 465         DEBUGFS_STATS_ADD(tx_expand_skb_head_cloned,
 466                 local->tx_expand_skb_head_cloned);
 467         DEBUGFS_STATS_ADD(rx_expand_skb_head,
 468                 local->rx_expand_skb_head);
 469         DEBUGFS_STATS_ADD(rx_expand_skb_head2,
 470                 local->rx_expand_skb_head2);
 471         DEBUGFS_STATS_ADD(rx_handlers_fragments,
 472                 local->rx_handlers_fragments);
 473         DEBUGFS_STATS_ADD(tx_status_drop,
 474                 local->tx_status_drop);
 475 #endif
 476         DEBUGFS_DEVSTATS_ADD(dot11ACKFailureCount);
 477         DEBUGFS_DEVSTATS_ADD(dot11RTSFailureCount);
 478         DEBUGFS_DEVSTATS_ADD(dot11FCSErrorCount);
 479         DEBUGFS_DEVSTATS_ADD(dot11RTSSuccessCount);
 480
 481         DEBUGFS_DEVSTATS_ADD(tx_latency);
 482 }