1 // SPDX-License-Identifier: GPL-2.0-only
3 * mac80211 debugfs for wireless PHYs
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
7 * Copyright (C) 2018 - 2019, 2021-2023 Intel Corporation
10 #include <linux/debugfs.h>
11 #include <linux/rtnetlink.h>
12 #include <linux/vmalloc.h>
13 #include "ieee80211_i.h"
14 #include "driver-ops.h"
18 #define DEBUGFS_FORMAT_BUFFER_SIZE 100
20 int mac80211_format_buffer(char __user *userbuf, size_t count,
21 loff_t *ppos, char *fmt, ...)
24 char buf[DEBUGFS_FORMAT_BUFFER_SIZE];
28 res = vscnprintf(buf, sizeof(buf), fmt, args);
31 return simple_read_from_buffer(userbuf, count, ppos, buf, res);
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) \
38 struct ieee80211_local *local = file->private_data; \
40 return mac80211_format_buffer(userbuf, count, ppos, \
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, \
51 #define DEBUGFS_READONLY_FILE(name, fmt, value...) \
52 DEBUGFS_READONLY_FILE_FN(name, fmt, value) \
53 DEBUGFS_READONLY_FILE_OPS(name)
55 #define DEBUGFS_ADD(name) \
56 debugfs_create_file(#name, 0400, phyd, local, &name## _ops)
58 #define DEBUGFS_ADD_MODE(name, mode) \
59 debugfs_create_file(#name, mode, phyd, local, &name## _ops);
62 DEBUGFS_READONLY_FILE(hw_conf, "%x",
63 local->hw.conf.flags);
64 DEBUGFS_READONLY_FILE(user_power, "%d",
65 local->user_power_level);
66 DEBUGFS_READONLY_FILE(power, "%d",
67 local->hw.conf.power_level);
68 DEBUGFS_READONLY_FILE(total_ps_buffered, "%d",
69 local->total_ps_buffered);
70 DEBUGFS_READONLY_FILE(wep_iv, "%#08x",
71 local->wep_iv & 0xffffff);
72 DEBUGFS_READONLY_FILE(rate_ctrl_alg, "%s",
73 local->rate_ctrl ? local->rate_ctrl->ops->name : "hw/driver");
75 static ssize_t aqm_read(struct file *file,
76 char __user *user_buf,
80 struct ieee80211_local *local = file->private_data;
81 struct fq *fq = &local->fq;
85 spin_lock_bh(&local->fq.lock);
88 len = scnprintf(buf, sizeof(buf),
93 "R fq_overmemory %u\n"
94 "R fq_collisions %u\n"
95 "R fq_memory_usage %u\n"
96 "RW fq_memory_limit %u\n"
110 spin_unlock_bh(&local->fq.lock);
112 return simple_read_from_buffer(user_buf, count, ppos,
116 static ssize_t aqm_write(struct file *file,
117 const char __user *user_buf,
121 struct ieee80211_local *local = file->private_data;
124 if (count >= sizeof(buf))
127 if (copy_from_user(buf, user_buf, count))
130 if (count && buf[count - 1] == '\n')
131 buf[count - 1] = '\0';
135 if (sscanf(buf, "fq_limit %u", &local->fq.limit) == 1)
137 else if (sscanf(buf, "fq_memory_limit %u", &local->fq.memory_limit) == 1)
139 else if (sscanf(buf, "fq_quantum %u", &local->fq.quantum) == 1)
145 static const struct file_operations aqm_ops = {
149 .llseek = default_llseek,
152 static ssize_t airtime_flags_read(struct file *file,
153 char __user *user_buf,
154 size_t count, loff_t *ppos)
156 struct ieee80211_local *local = file->private_data;
157 char buf[128] = {}, *pos, *end;
160 end = pos + sizeof(buf) - 1;
162 if (local->airtime_flags & AIRTIME_USE_TX)
163 pos += scnprintf(pos, end - pos, "AIRTIME_TX\t(%lx)\n",
165 if (local->airtime_flags & AIRTIME_USE_RX)
166 pos += scnprintf(pos, end - pos, "AIRTIME_RX\t(%lx)\n",
169 return simple_read_from_buffer(user_buf, count, ppos, buf,
173 static ssize_t airtime_flags_write(struct file *file,
174 const char __user *user_buf,
175 size_t count, loff_t *ppos)
177 struct ieee80211_local *local = file->private_data;
180 if (count >= sizeof(buf))
183 if (copy_from_user(buf, user_buf, count))
186 if (count && buf[count - 1] == '\n')
187 buf[count - 1] = '\0';
191 if (kstrtou16(buf, 0, &local->airtime_flags))
197 static const struct file_operations airtime_flags_ops = {
198 .write = airtime_flags_write,
199 .read = airtime_flags_read,
201 .llseek = default_llseek,
204 static ssize_t aql_pending_read(struct file *file,
205 char __user *user_buf,
206 size_t count, loff_t *ppos)
208 struct ieee80211_local *local = file->private_data;
212 len = scnprintf(buf, sizeof(buf),
219 atomic_read(&local->aql_ac_pending_airtime[IEEE80211_AC_VO]),
220 atomic_read(&local->aql_ac_pending_airtime[IEEE80211_AC_VI]),
221 atomic_read(&local->aql_ac_pending_airtime[IEEE80211_AC_BE]),
222 atomic_read(&local->aql_ac_pending_airtime[IEEE80211_AC_BK]),
223 atomic_read(&local->aql_total_pending_airtime));
224 return simple_read_from_buffer(user_buf, count, ppos,
228 static const struct file_operations aql_pending_ops = {
229 .read = aql_pending_read,
231 .llseek = default_llseek,
234 static ssize_t aql_txq_limit_read(struct file *file,
235 char __user *user_buf,
239 struct ieee80211_local *local = file->private_data;
243 len = scnprintf(buf, sizeof(buf),
244 "AC AQL limit low AQL limit high\n"
249 local->aql_txq_limit_low[IEEE80211_AC_VO],
250 local->aql_txq_limit_high[IEEE80211_AC_VO],
251 local->aql_txq_limit_low[IEEE80211_AC_VI],
252 local->aql_txq_limit_high[IEEE80211_AC_VI],
253 local->aql_txq_limit_low[IEEE80211_AC_BE],
254 local->aql_txq_limit_high[IEEE80211_AC_BE],
255 local->aql_txq_limit_low[IEEE80211_AC_BK],
256 local->aql_txq_limit_high[IEEE80211_AC_BK]);
257 return simple_read_from_buffer(user_buf, count, ppos,
261 static ssize_t aql_txq_limit_write(struct file *file,
262 const char __user *user_buf,
266 struct ieee80211_local *local = file->private_data;
268 u32 ac, q_limit_low, q_limit_high, q_limit_low_old, q_limit_high_old;
269 struct sta_info *sta;
271 if (count >= sizeof(buf))
274 if (copy_from_user(buf, user_buf, count))
277 if (count && buf[count - 1] == '\n')
278 buf[count - 1] = '\0';
282 if (sscanf(buf, "%u %u %u", &ac, &q_limit_low, &q_limit_high) != 3)
285 if (ac >= IEEE80211_NUM_ACS)
288 q_limit_low_old = local->aql_txq_limit_low[ac];
289 q_limit_high_old = local->aql_txq_limit_high[ac];
291 wiphy_lock(local->hw.wiphy);
292 local->aql_txq_limit_low[ac] = q_limit_low;
293 local->aql_txq_limit_high[ac] = q_limit_high;
295 list_for_each_entry(sta, &local->sta_list, list) {
296 /* If a sta has customized queue limits, keep it */
297 if (sta->airtime[ac].aql_limit_low == q_limit_low_old &&
298 sta->airtime[ac].aql_limit_high == q_limit_high_old) {
299 sta->airtime[ac].aql_limit_low = q_limit_low;
300 sta->airtime[ac].aql_limit_high = q_limit_high;
303 wiphy_unlock(local->hw.wiphy);
308 static const struct file_operations aql_txq_limit_ops = {
309 .write = aql_txq_limit_write,
310 .read = aql_txq_limit_read,
312 .llseek = default_llseek,
315 static ssize_t aql_enable_read(struct file *file, char __user *user_buf,
316 size_t count, loff_t *ppos)
321 len = scnprintf(buf, sizeof(buf), "%d\n",
322 !static_key_false(&aql_disable.key));
324 return simple_read_from_buffer(user_buf, count, ppos, buf, len);
327 static ssize_t aql_enable_write(struct file *file, const char __user *user_buf,
328 size_t count, loff_t *ppos)
330 bool aql_disabled = static_key_false(&aql_disable.key);
334 if (count > sizeof(buf))
337 if (copy_from_user(buf, user_buf, count))
340 buf[sizeof(buf) - 1] = '\0';
342 if (len > 0 && buf[len - 1] == '\n')
345 if (buf[0] == '0' && buf[1] == '\0') {
347 static_branch_inc(&aql_disable);
348 } else if (buf[0] == '1' && buf[1] == '\0') {
350 static_branch_dec(&aql_disable);
358 static const struct file_operations aql_enable_ops = {
359 .write = aql_enable_write,
360 .read = aql_enable_read,
362 .llseek = default_llseek,
365 static ssize_t force_tx_status_read(struct file *file,
366 char __user *user_buf,
370 struct ieee80211_local *local = file->private_data;
374 len = scnprintf(buf, sizeof(buf), "%d\n", (int)local->force_tx_status);
376 return simple_read_from_buffer(user_buf, count, ppos,
380 static ssize_t force_tx_status_write(struct file *file,
381 const char __user *user_buf,
385 struct ieee80211_local *local = file->private_data;
388 if (count >= sizeof(buf))
391 if (copy_from_user(buf, user_buf, count))
394 if (count && buf[count - 1] == '\n')
395 buf[count - 1] = '\0';
399 if (buf[0] == '0' && buf[1] == '\0')
400 local->force_tx_status = 0;
401 else if (buf[0] == '1' && buf[1] == '\0')
402 local->force_tx_status = 1;
409 static const struct file_operations force_tx_status_ops = {
410 .write = force_tx_status_write,
411 .read = force_tx_status_read,
413 .llseek = default_llseek,
417 static ssize_t reset_write(struct file *file, const char __user *user_buf,
418 size_t count, loff_t *ppos)
420 struct ieee80211_local *local = file->private_data;
424 wiphy_lock(local->hw.wiphy);
425 __ieee80211_suspend(&local->hw, NULL);
426 ret = __ieee80211_resume(&local->hw);
427 wiphy_unlock(local->hw.wiphy);
430 cfg80211_shutdown_all_interfaces(local->hw.wiphy);
437 static const struct file_operations reset_ops = {
438 .write = reset_write,
440 .llseek = noop_llseek,
444 static const char *hw_flag_names[] = {
445 #define FLAG(F) [IEEE80211_HW_##F] = #F
446 FLAG(HAS_RATE_CONTROL),
447 FLAG(RX_INCLUDES_FCS),
448 FLAG(HOST_BROADCAST_PS_BUFFERING),
451 FLAG(NEED_DTIM_BEFORE_ASSOC),
453 FLAG(AMPDU_AGGREGATION),
455 FLAG(PS_NULLFUNC_STACK),
456 FLAG(SUPPORTS_DYNAMIC_PS),
458 FLAG(WANT_MONITOR_VIF),
460 FLAG(SW_CRYPTO_CONTROL),
461 FLAG(SUPPORT_FAST_XMIT),
462 FLAG(REPORTS_TX_ACK_STATUS),
463 FLAG(CONNECTION_MONITOR),
465 FLAG(SUPPORTS_PER_STA_GTK),
467 FLAG(TX_AMPDU_SETUP_IN_HW),
468 FLAG(SUPPORTS_RC_TABLE),
469 FLAG(P2P_DEV_ADDR_FOR_INTF),
470 FLAG(TIMING_BEACON_ONLY),
471 FLAG(SUPPORTS_HT_CCK_RATES),
472 FLAG(CHANCTX_STA_CSA),
473 FLAG(SUPPORTS_CLONED_SKBS),
474 FLAG(SINGLE_SCAN_ON_ALL_BANDS),
476 FLAG(SUPPORTS_AMSDU_IN_AMPDU),
477 FLAG(BEACON_TX_STATUS),
478 FLAG(NEEDS_UNIQUE_STA_ADDR),
479 FLAG(SUPPORTS_REORDERING_BUFFER),
483 FLAG(REPORTS_LOW_ACK),
484 FLAG(SUPPORTS_TX_FRAG),
485 FLAG(SUPPORTS_TDLS_BUFFER_STA),
486 FLAG(DEAUTH_NEED_MGD_TX_PREP),
487 FLAG(DOESNT_SUPPORT_QOS_NDP),
488 FLAG(BUFF_MMPDU_TXQ),
489 FLAG(SUPPORTS_VHT_EXT_NSS_BW),
491 FLAG(TX_STATUS_NO_AMPDU_LEN),
492 FLAG(SUPPORTS_MULTI_BSSID),
493 FLAG(SUPPORTS_ONLY_HE_MULTI_BSSID),
494 FLAG(AMPDU_KEYBORDER_SUPPORT),
495 FLAG(SUPPORTS_TX_ENCAP_OFFLOAD),
496 FLAG(SUPPORTS_RX_DECAP_OFFLOAD),
497 FLAG(SUPPORTS_CONC_MON_RX_DECAP),
498 FLAG(DETECTS_COLOR_COLLISION),
499 FLAG(MLO_MCAST_MULTI_LINK_TX),
503 static ssize_t hwflags_read(struct file *file, char __user *user_buf,
504 size_t count, loff_t *ppos)
506 struct ieee80211_local *local = file->private_data;
507 size_t bufsz = 30 * NUM_IEEE80211_HW_FLAGS;
508 char *buf = kzalloc(bufsz, GFP_KERNEL);
509 char *pos = buf, *end = buf + bufsz - 1;
516 /* fail compilation if somebody adds or removes
517 * a flag without updating the name array above
519 BUILD_BUG_ON(ARRAY_SIZE(hw_flag_names) != NUM_IEEE80211_HW_FLAGS);
521 for (i = 0; i < NUM_IEEE80211_HW_FLAGS; i++) {
522 if (test_bit(i, local->hw.flags))
523 pos += scnprintf(pos, end - pos, "%s\n",
527 rv = simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
532 static ssize_t misc_read(struct file *file, char __user *user_buf,
533 size_t count, loff_t *ppos)
535 struct ieee80211_local *local = file->private_data;
536 /* Max len of each line is 16 characters, plus 9 for 'pending:\n' */
537 size_t bufsz = IEEE80211_MAX_QUEUES * 16 + 9;
544 buf = kzalloc(bufsz, GFP_KERNEL);
549 end = buf + bufsz - 1;
551 pos += scnprintf(pos, end - pos, "pending:\n");
553 for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
554 ln = skb_queue_len(&local->pending[i]);
555 pos += scnprintf(pos, end - pos, "[%i] %d\n",
559 rv = simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
564 static ssize_t queues_read(struct file *file, char __user *user_buf,
565 size_t count, loff_t *ppos)
567 struct ieee80211_local *local = file->private_data;
569 char buf[IEEE80211_MAX_QUEUES * 20];
572 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
573 for (q = 0; q < local->hw.queues; q++)
574 res += sprintf(buf + res, "%02d: %#.8lx/%d\n", q,
575 local->queue_stop_reasons[q],
576 skb_queue_len(&local->pending[q]));
577 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
579 return simple_read_from_buffer(user_buf, count, ppos, buf, res);
582 DEBUGFS_READONLY_FILE_OPS(hwflags);
583 DEBUGFS_READONLY_FILE_OPS(queues);
584 DEBUGFS_READONLY_FILE_OPS(misc);
586 /* statistics stuff */
588 static ssize_t format_devstat_counter(struct ieee80211_local *local,
589 char __user *userbuf,
590 size_t count, loff_t *ppos,
591 int (*printvalue)(struct ieee80211_low_level_stats *stats, char *buf,
594 struct ieee80211_low_level_stats stats;
598 wiphy_lock(local->hw.wiphy);
599 res = drv_get_stats(local, &stats);
600 wiphy_unlock(local->hw.wiphy);
603 res = printvalue(&stats, buf, sizeof(buf));
604 return simple_read_from_buffer(userbuf, count, ppos, buf, res);
607 #define DEBUGFS_DEVSTATS_FILE(name) \
608 static int print_devstats_##name(struct ieee80211_low_level_stats *stats,\
609 char *buf, int buflen) \
611 return scnprintf(buf, buflen, "%u\n", stats->name); \
613 static ssize_t stats_ ##name## _read(struct file *file, \
614 char __user *userbuf, \
615 size_t count, loff_t *ppos) \
617 return format_devstat_counter(file->private_data, \
621 print_devstats_##name); \
624 static const struct file_operations stats_ ##name## _ops = { \
625 .read = stats_ ##name## _read, \
626 .open = simple_open, \
627 .llseek = generic_file_llseek, \
630 #ifdef CONFIG_MAC80211_DEBUG_COUNTERS
631 #define DEBUGFS_STATS_ADD(name) \
632 debugfs_create_u32(#name, 0400, statsd, &local->name);
634 #define DEBUGFS_DEVSTATS_ADD(name) \
635 debugfs_create_file(#name, 0400, statsd, local, &stats_ ##name## _ops);
637 DEBUGFS_DEVSTATS_FILE(dot11ACKFailureCount);
638 DEBUGFS_DEVSTATS_FILE(dot11RTSFailureCount);
639 DEBUGFS_DEVSTATS_FILE(dot11FCSErrorCount);
640 DEBUGFS_DEVSTATS_FILE(dot11RTSSuccessCount);
642 void debugfs_hw_add(struct ieee80211_local *local)
644 struct dentry *phyd = local->hw.wiphy->debugfsdir;
645 struct dentry *statsd;
650 local->debugfs.keys = debugfs_create_dir("keys", phyd);
652 DEBUGFS_ADD(total_ps_buffered);
654 DEBUGFS_ADD(rate_ctrl_alg);
658 DEBUGFS_ADD_MODE(reset, 0200);
660 DEBUGFS_ADD(hwflags);
661 DEBUGFS_ADD(user_power);
663 DEBUGFS_ADD(hw_conf);
664 DEBUGFS_ADD_MODE(force_tx_status, 0600);
665 DEBUGFS_ADD_MODE(aql_enable, 0600);
666 DEBUGFS_ADD(aql_pending);
667 DEBUGFS_ADD_MODE(aqm, 0600);
669 DEBUGFS_ADD_MODE(airtime_flags, 0600);
671 DEBUGFS_ADD(aql_txq_limit);
672 debugfs_create_u32("aql_threshold", 0600,
673 phyd, &local->aql_threshold);
675 statsd = debugfs_create_dir("statistics", phyd);
677 #ifdef CONFIG_MAC80211_DEBUG_COUNTERS
678 DEBUGFS_STATS_ADD(dot11TransmittedFragmentCount);
679 DEBUGFS_STATS_ADD(dot11MulticastTransmittedFrameCount);
680 DEBUGFS_STATS_ADD(dot11FailedCount);
681 DEBUGFS_STATS_ADD(dot11RetryCount);
682 DEBUGFS_STATS_ADD(dot11MultipleRetryCount);
683 DEBUGFS_STATS_ADD(dot11FrameDuplicateCount);
684 DEBUGFS_STATS_ADD(dot11ReceivedFragmentCount);
685 DEBUGFS_STATS_ADD(dot11MulticastReceivedFrameCount);
686 DEBUGFS_STATS_ADD(dot11TransmittedFrameCount);
687 DEBUGFS_STATS_ADD(tx_handlers_drop);
688 DEBUGFS_STATS_ADD(tx_handlers_queued);
689 DEBUGFS_STATS_ADD(tx_handlers_drop_wep);
690 DEBUGFS_STATS_ADD(tx_handlers_drop_not_assoc);
691 DEBUGFS_STATS_ADD(tx_handlers_drop_unauth_port);
692 DEBUGFS_STATS_ADD(rx_handlers_drop);
693 DEBUGFS_STATS_ADD(rx_handlers_queued);
694 DEBUGFS_STATS_ADD(rx_handlers_drop_nullfunc);
695 DEBUGFS_STATS_ADD(rx_handlers_drop_defrag);
696 DEBUGFS_STATS_ADD(tx_expand_skb_head);
697 DEBUGFS_STATS_ADD(tx_expand_skb_head_cloned);
698 DEBUGFS_STATS_ADD(rx_expand_skb_head_defrag);
699 DEBUGFS_STATS_ADD(rx_handlers_fragments);
700 DEBUGFS_STATS_ADD(tx_status_drop);
702 DEBUGFS_DEVSTATS_ADD(dot11ACKFailureCount);
703 DEBUGFS_DEVSTATS_ADD(dot11RTSFailureCount);
704 DEBUGFS_DEVSTATS_ADD(dot11FCSErrorCount);
705 DEBUGFS_DEVSTATS_ADD(dot11RTSSuccessCount);