1 
2 /*
3  * mac80211 debugfs for wireless PHYs
4  *
5  * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
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 
mac80211_format_buffer(char __user * userbuf,size_t count,loff_t * ppos,char * fmt,...)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(frequency, "%d",
67 		      local->hw.conf.channel->center_freq);
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");
74 
reset_write(struct file * file,const char __user * user_buf,size_t count,loff_t * ppos)75 static ssize_t reset_write(struct file *file, const char __user *user_buf,
76 			   size_t count, loff_t *ppos)
77 {
78 	struct ieee80211_local *local = file->private_data;
79 
80 	rtnl_lock();
81 	__ieee80211_suspend(&local->hw, NULL);
82 	__ieee80211_resume(&local->hw);
83 	rtnl_unlock();
84 
85 	return count;
86 }
87 
88 static const struct file_operations reset_ops = {
89 	.write = reset_write,
90 	.open = simple_open,
91 	.llseek = noop_llseek,
92 };
93 
channel_type_read(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)94 static ssize_t channel_type_read(struct file *file, char __user *user_buf,
95 		       size_t count, loff_t *ppos)
96 {
97 	struct ieee80211_local *local = file->private_data;
98 	const char *buf;
99 
100 	switch (local->hw.conf.channel_type) {
101 	case NL80211_CHAN_NO_HT:
102 		buf = "no ht\n";
103 		break;
104 	case NL80211_CHAN_HT20:
105 		buf = "ht20\n";
106 		break;
107 	case NL80211_CHAN_HT40MINUS:
108 		buf = "ht40-\n";
109 		break;
110 	case NL80211_CHAN_HT40PLUS:
111 		buf = "ht40+\n";
112 		break;
113 	default:
114 		buf = "???";
115 		break;
116 	}
117 
118 	return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
119 }
120 
hwflags_read(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)121 static ssize_t hwflags_read(struct file *file, char __user *user_buf,
122 			    size_t count, loff_t *ppos)
123 {
124 	struct ieee80211_local *local = file->private_data;
125 	int mxln = 500;
126 	ssize_t rv;
127 	char *buf = kzalloc(mxln, GFP_KERNEL);
128 	int sf = 0; /* how many written so far */
129 
130 	if (!buf)
131 		return 0;
132 
133 	sf += snprintf(buf, mxln - sf, "0x%x\n", local->hw.flags);
134 	if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
135 		sf += snprintf(buf + sf, mxln - sf, "HAS_RATE_CONTROL\n");
136 	if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
137 		sf += snprintf(buf + sf, mxln - sf, "RX_INCLUDES_FCS\n");
138 	if (local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)
139 		sf += snprintf(buf + sf, mxln - sf,
140 			       "HOST_BCAST_PS_BUFFERING\n");
141 	if (local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE)
142 		sf += snprintf(buf + sf, mxln - sf,
143 			       "2GHZ_SHORT_SLOT_INCAPABLE\n");
144 	if (local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE)
145 		sf += snprintf(buf + sf, mxln - sf,
146 			       "2GHZ_SHORT_PREAMBLE_INCAPABLE\n");
147 	if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
148 		sf += snprintf(buf + sf, mxln - sf, "SIGNAL_UNSPEC\n");
149 	if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
150 		sf += snprintf(buf + sf, mxln - sf, "SIGNAL_DBM\n");
151 	if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
152 		sf += snprintf(buf + sf, mxln - sf, "NEED_DTIM_PERIOD\n");
153 	if (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT)
154 		sf += snprintf(buf + sf, mxln - sf, "SPECTRUM_MGMT\n");
155 	if (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)
156 		sf += snprintf(buf + sf, mxln - sf, "AMPDU_AGGREGATION\n");
157 	if (local->hw.flags & IEEE80211_HW_SUPPORTS_PS)
158 		sf += snprintf(buf + sf, mxln - sf, "SUPPORTS_PS\n");
159 	if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
160 		sf += snprintf(buf + sf, mxln - sf, "PS_NULLFUNC_STACK\n");
161 	if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
162 		sf += snprintf(buf + sf, mxln - sf, "SUPPORTS_DYNAMIC_PS\n");
163 	if (local->hw.flags & IEEE80211_HW_MFP_CAPABLE)
164 		sf += snprintf(buf + sf, mxln - sf, "MFP_CAPABLE\n");
165 	if (local->hw.flags & IEEE80211_HW_SUPPORTS_STATIC_SMPS)
166 		sf += snprintf(buf + sf, mxln - sf, "SUPPORTS_STATIC_SMPS\n");
167 	if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
168 		sf += snprintf(buf + sf, mxln - sf, "SUPPORTS_DYNAMIC_SMPS\n");
169 	if (local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
170 		sf += snprintf(buf + sf, mxln - sf, "SUPPORTS_UAPSD\n");
171 	if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
172 		sf += snprintf(buf + sf, mxln - sf, "REPORTS_TX_ACK_STATUS\n");
173 	if (local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
174 		sf += snprintf(buf + sf, mxln - sf, "CONNECTION_MONITOR\n");
175 	if (local->hw.flags & IEEE80211_HW_SUPPORTS_PER_STA_GTK)
176 		sf += snprintf(buf + sf, mxln - sf, "SUPPORTS_PER_STA_GTK\n");
177 	if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
178 		sf += snprintf(buf + sf, mxln - sf, "AP_LINK_PS\n");
179 	if (local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)
180 		sf += snprintf(buf + sf, mxln - sf, "TX_AMPDU_SETUP_IN_HW\n");
181 	if (local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)
182 		sf += snprintf(buf + sf, mxln - sf, "SCAN_WHILE_IDLE\n");
183 
184 	rv = simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
185 	kfree(buf);
186 	return rv;
187 }
188 
queues_read(struct file * file,char __user * user_buf,size_t count,loff_t * ppos)189 static ssize_t queues_read(struct file *file, char __user *user_buf,
190 			   size_t count, loff_t *ppos)
191 {
192 	struct ieee80211_local *local = file->private_data;
193 	unsigned long flags;
194 	char buf[IEEE80211_MAX_QUEUES * 20];
195 	int q, res = 0;
196 
197 	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
198 	for (q = 0; q < local->hw.queues; q++)
199 		res += sprintf(buf + res, "%02d: %#.8lx/%d\n", q,
200 				local->queue_stop_reasons[q],
201 				skb_queue_len(&local->pending[q]));
202 	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
203 
204 	return simple_read_from_buffer(user_buf, count, ppos, buf, res);
205 }
206 
207 DEBUGFS_READONLY_FILE_OPS(hwflags);
208 DEBUGFS_READONLY_FILE_OPS(channel_type);
209 DEBUGFS_READONLY_FILE_OPS(queues);
210 
211 /* statistics stuff */
212 
format_devstat_counter(struct ieee80211_local * local,char __user * userbuf,size_t count,loff_t * ppos,int (* printvalue)(struct ieee80211_low_level_stats * stats,char * buf,int buflen))213 static ssize_t format_devstat_counter(struct ieee80211_local *local,
214 	char __user *userbuf,
215 	size_t count, loff_t *ppos,
216 	int (*printvalue)(struct ieee80211_low_level_stats *stats, char *buf,
217 			  int buflen))
218 {
219 	struct ieee80211_low_level_stats stats;
220 	char buf[20];
221 	int res;
222 
223 	rtnl_lock();
224 	res = drv_get_stats(local, &stats);
225 	rtnl_unlock();
226 	if (res)
227 		return res;
228 	res = printvalue(&stats, buf, sizeof(buf));
229 	return simple_read_from_buffer(userbuf, count, ppos, buf, res);
230 }
231 
232 #define DEBUGFS_DEVSTATS_FILE(name)					\
233 static int print_devstats_##name(struct ieee80211_low_level_stats *stats,\
234 				 char *buf, int buflen)			\
235 {									\
236 	return scnprintf(buf, buflen, "%u\n", stats->name);		\
237 }									\
238 static ssize_t stats_ ##name## _read(struct file *file,			\
239 				     char __user *userbuf,		\
240 				     size_t count, loff_t *ppos)	\
241 {									\
242 	return format_devstat_counter(file->private_data,		\
243 				      userbuf,				\
244 				      count,				\
245 				      ppos,				\
246 				      print_devstats_##name);		\
247 }									\
248 									\
249 static const struct file_operations stats_ ##name## _ops = {		\
250 	.read = stats_ ##name## _read,					\
251 	.open = simple_open,						\
252 	.llseek = generic_file_llseek,					\
253 };
254 
255 #define DEBUGFS_STATS_ADD(name, field)					\
256 	debugfs_create_u32(#name, 0400, statsd, (u32 *) &field);
257 #define DEBUGFS_DEVSTATS_ADD(name)					\
258 	debugfs_create_file(#name, 0400, statsd, local, &stats_ ##name## _ops);
259 
260 DEBUGFS_DEVSTATS_FILE(dot11ACKFailureCount);
261 DEBUGFS_DEVSTATS_FILE(dot11RTSFailureCount);
262 DEBUGFS_DEVSTATS_FILE(dot11FCSErrorCount);
263 DEBUGFS_DEVSTATS_FILE(dot11RTSSuccessCount);
264 
debugfs_hw_add(struct ieee80211_local * local)265 void debugfs_hw_add(struct ieee80211_local *local)
266 {
267 	struct dentry *phyd = local->hw.wiphy->debugfsdir;
268 	struct dentry *statsd;
269 
270 	if (!phyd)
271 		return;
272 
273 	local->debugfs.keys = debugfs_create_dir("keys", phyd);
274 
275 	DEBUGFS_ADD(frequency);
276 	DEBUGFS_ADD(total_ps_buffered);
277 	DEBUGFS_ADD(wep_iv);
278 	DEBUGFS_ADD(queues);
279 	DEBUGFS_ADD_MODE(reset, 0200);
280 	DEBUGFS_ADD(channel_type);
281 	DEBUGFS_ADD(hwflags);
282 	DEBUGFS_ADD(user_power);
283 	DEBUGFS_ADD(power);
284 
285 	statsd = debugfs_create_dir("statistics", phyd);
286 
287 	/* if the dir failed, don't put all the other things into the root! */
288 	if (!statsd)
289 		return;
290 
291 	DEBUGFS_STATS_ADD(transmitted_fragment_count,
292 		local->dot11TransmittedFragmentCount);
293 	DEBUGFS_STATS_ADD(multicast_transmitted_frame_count,
294 		local->dot11MulticastTransmittedFrameCount);
295 	DEBUGFS_STATS_ADD(failed_count, local->dot11FailedCount);
296 	DEBUGFS_STATS_ADD(retry_count, local->dot11RetryCount);
297 	DEBUGFS_STATS_ADD(multiple_retry_count,
298 		local->dot11MultipleRetryCount);
299 	DEBUGFS_STATS_ADD(frame_duplicate_count,
300 		local->dot11FrameDuplicateCount);
301 	DEBUGFS_STATS_ADD(received_fragment_count,
302 		local->dot11ReceivedFragmentCount);
303 	DEBUGFS_STATS_ADD(multicast_received_frame_count,
304 		local->dot11MulticastReceivedFrameCount);
305 	DEBUGFS_STATS_ADD(transmitted_frame_count,
306 		local->dot11TransmittedFrameCount);
307 #ifdef CONFIG_MAC80211_DEBUG_COUNTERS
308 	DEBUGFS_STATS_ADD(tx_handlers_drop, local->tx_handlers_drop);
309 	DEBUGFS_STATS_ADD(tx_handlers_queued, local->tx_handlers_queued);
310 	DEBUGFS_STATS_ADD(tx_handlers_drop_unencrypted,
311 		local->tx_handlers_drop_unencrypted);
312 	DEBUGFS_STATS_ADD(tx_handlers_drop_fragment,
313 		local->tx_handlers_drop_fragment);
314 	DEBUGFS_STATS_ADD(tx_handlers_drop_wep,
315 		local->tx_handlers_drop_wep);
316 	DEBUGFS_STATS_ADD(tx_handlers_drop_not_assoc,
317 		local->tx_handlers_drop_not_assoc);
318 	DEBUGFS_STATS_ADD(tx_handlers_drop_unauth_port,
319 		local->tx_handlers_drop_unauth_port);
320 	DEBUGFS_STATS_ADD(rx_handlers_drop, local->rx_handlers_drop);
321 	DEBUGFS_STATS_ADD(rx_handlers_queued, local->rx_handlers_queued);
322 	DEBUGFS_STATS_ADD(rx_handlers_drop_nullfunc,
323 		local->rx_handlers_drop_nullfunc);
324 	DEBUGFS_STATS_ADD(rx_handlers_drop_defrag,
325 		local->rx_handlers_drop_defrag);
326 	DEBUGFS_STATS_ADD(rx_handlers_drop_short,
327 		local->rx_handlers_drop_short);
328 	DEBUGFS_STATS_ADD(rx_handlers_drop_passive_scan,
329 		local->rx_handlers_drop_passive_scan);
330 	DEBUGFS_STATS_ADD(tx_expand_skb_head,
331 		local->tx_expand_skb_head);
332 	DEBUGFS_STATS_ADD(tx_expand_skb_head_cloned,
333 		local->tx_expand_skb_head_cloned);
334 	DEBUGFS_STATS_ADD(rx_expand_skb_head,
335 		local->rx_expand_skb_head);
336 	DEBUGFS_STATS_ADD(rx_expand_skb_head2,
337 		local->rx_expand_skb_head2);
338 	DEBUGFS_STATS_ADD(rx_handlers_fragments,
339 		local->rx_handlers_fragments);
340 	DEBUGFS_STATS_ADD(tx_status_drop,
341 		local->tx_status_drop);
342 #endif
343 	DEBUGFS_DEVSTATS_ADD(dot11ACKFailureCount);
344 	DEBUGFS_DEVSTATS_ADD(dot11RTSFailureCount);
345 	DEBUGFS_DEVSTATS_ADD(dot11FCSErrorCount);
346 	DEBUGFS_DEVSTATS_ADD(dot11RTSSuccessCount);
347 }
348