summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/iwlwifi/iwl-agn-rx.c
blob: b192ca842f0a828a4ee96844bf36f9580ea472af (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
/******************************************************************************
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2008 - 2010 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
 * USA
 *
 * The full GNU General Public License is included in this distribution
 * in the file called LICENSE.GPL.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 *****************************************************************************/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h>

#include "iwl-dev.h"
#include "iwl-core.h"
#include "iwl-agn-calib.h"
#include "iwl-sta.h"
#include "iwl-io.h"
#include "iwl-helpers.h"
#include "iwl-agn-hw.h"
#include "iwl-agn.h"

void iwl_rx_missed_beacon_notif(struct iwl_priv *priv,
				struct iwl_rx_mem_buffer *rxb)

{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	struct iwl_missed_beacon_notif *missed_beacon;

	missed_beacon = &pkt->u.missed_beacon;
	if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) >
	    priv->missed_beacon_threshold) {
		IWL_DEBUG_CALIB(priv,
		    "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
		    le32_to_cpu(missed_beacon->consecutive_missed_beacons),
		    le32_to_cpu(missed_beacon->total_missed_becons),
		    le32_to_cpu(missed_beacon->num_recvd_beacons),
		    le32_to_cpu(missed_beacon->num_expected_beacons));
		if (!test_bit(STATUS_SCANNING, &priv->status))
			iwl_init_sensitivity(priv);
	}
}

/* Calculate noise level, based on measurements during network silence just
 *   before arriving beacon.  This measurement can be done only if we know
 *   exactly when to expect beacons, therefore only when we're associated. */
static void iwl_rx_calc_noise(struct iwl_priv *priv)
{
	struct statistics_rx_non_phy *rx_info;
	int num_active_rx = 0;
	int total_silence = 0;
	int bcn_silence_a, bcn_silence_b, bcn_silence_c;
	int last_rx_noise;

	if (iwl_bt_statistics(priv))
		rx_info = &(priv->_agn.statistics_bt.rx.general.common);
	else
		rx_info = &(priv->_agn.statistics.rx.general);
	bcn_silence_a =
		le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
	bcn_silence_b =
		le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
	bcn_silence_c =
		le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;

	if (bcn_silence_a) {
		total_silence += bcn_silence_a;
		num_active_rx++;
	}
	if (bcn_silence_b) {
		total_silence += bcn_silence_b;
		num_active_rx++;
	}
	if (bcn_silence_c) {
		total_silence += bcn_silence_c;
		num_active_rx++;
	}

	/* Average among active antennas */
	if (num_active_rx)
		last_rx_noise = (total_silence / num_active_rx) - 107;
	else
		last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;

	IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
			bcn_silence_a, bcn_silence_b, bcn_silence_c,
			last_rx_noise);
}

#ifdef CONFIG_IWLWIFI_DEBUGFS
/*
 *  based on the assumption of all statistics counter are in DWORD
 *  FIXME: This function is for debugging, do not deal with
 *  the case of counters roll-over.
 */
static void iwl_accumulative_statistics(struct iwl_priv *priv,
					__le32 *stats)
{
	int i, size;
	__le32 *prev_stats;
	u32 *accum_stats;
	u32 *delta, *max_delta;
	struct statistics_general_common *general, *accum_general;
	struct statistics_tx *tx, *accum_tx;

	if (iwl_bt_statistics(priv)) {
		prev_stats = (__le32 *)&priv->_agn.statistics_bt;
		accum_stats = (u32 *)&priv->_agn.accum_statistics_bt;
		size = sizeof(struct iwl_bt_notif_statistics);
		general = &priv->_agn.statistics_bt.general.common;
		accum_general = &priv->_agn.accum_statistics_bt.general.common;
		tx = &priv->_agn.statistics_bt.tx;
		accum_tx = &priv->_agn.accum_statistics_bt.tx;
		delta = (u32 *)&priv->_agn.delta_statistics_bt;
		max_delta = (u32 *)&priv->_agn.max_delta_bt;
	} else {
		prev_stats = (__le32 *)&priv->_agn.statistics;
		accum_stats = (u32 *)&priv->_agn.accum_statistics;
		size = sizeof(struct iwl_notif_statistics);
		general = &priv->_agn.statistics.general.common;
		accum_general = &priv->_agn.accum_statistics.general.common;
		tx = &priv->_agn.statistics.tx;
		accum_tx = &priv->_agn.accum_statistics.tx;
		delta = (u32 *)&priv->_agn.delta_statistics;
		max_delta = (u32 *)&priv->_agn.max_delta;
	}
	for (i = sizeof(__le32); i < size;
	     i += sizeof(__le32), stats++, prev_stats++, delta++,
	     max_delta++, accum_stats++) {
		if (le32_to_cpu(*stats) > le32_to_cpu(*prev_stats)) {
			*delta = (le32_to_cpu(*stats) -
				le32_to_cpu(*prev_stats));
			*accum_stats += *delta;
			if (*delta > *max_delta)
				*max_delta = *delta;
		}
	}

	/* reset accumulative statistics for "no-counter" type statistics */
	accum_general->temperature = general->temperature;
	accum_general->temperature_m = general->temperature_m;
	accum_general->ttl_timestamp = general->ttl_timestamp;
	accum_tx->tx_power.ant_a = tx->tx_power.ant_a;
	accum_tx->tx_power.ant_b = tx->tx_power.ant_b;
	accum_tx->tx_power.ant_c = tx->tx_power.ant_c;
}
#endif

#define REG_RECALIB_PERIOD (60)

/**
 * iwl_good_plcp_health - checks for plcp error.
 *
 * When the plcp error is exceeding the thresholds, reset the radio
 * to improve the throughput.
 */
bool iwl_good_plcp_health(struct iwl_priv *priv,
				struct iwl_rx_packet *pkt)
{
	bool rc = true;
	int combined_plcp_delta;
	unsigned int plcp_msec;
	unsigned long plcp_received_jiffies;

	if (priv->cfg->base_params->plcp_delta_threshold ==
	    IWL_MAX_PLCP_ERR_THRESHOLD_DISABLE) {
		IWL_DEBUG_RADIO(priv, "plcp_err check disabled\n");
		return rc;
	}

	/*
	 * check for plcp_err and trigger radio reset if it exceeds
	 * the plcp error threshold plcp_delta.
	 */
	plcp_received_jiffies = jiffies;
	plcp_msec = jiffies_to_msecs((long) plcp_received_jiffies -
					(long) priv->plcp_jiffies);
	priv->plcp_jiffies = plcp_received_jiffies;
	/*
	 * check to make sure plcp_msec is not 0 to prevent division
	 * by zero.
	 */
	if (plcp_msec) {
		struct statistics_rx_phy *ofdm;
		struct statistics_rx_ht_phy *ofdm_ht;

		if (iwl_bt_statistics(priv)) {
			ofdm = &pkt->u.stats_bt.rx.ofdm;
			ofdm_ht = &pkt->u.stats_bt.rx.ofdm_ht;
			combined_plcp_delta =
			   (le32_to_cpu(ofdm->plcp_err) -
			   le32_to_cpu(priv->_agn.statistics_bt.
				       rx.ofdm.plcp_err)) +
			   (le32_to_cpu(ofdm_ht->plcp_err) -
			   le32_to_cpu(priv->_agn.statistics_bt.
				       rx.ofdm_ht.plcp_err));
		} else {
			ofdm = &pkt->u.stats.rx.ofdm;
			ofdm_ht = &pkt->u.stats.rx.ofdm_ht;
			combined_plcp_delta =
			    (le32_to_cpu(ofdm->plcp_err) -
			    le32_to_cpu(priv->_agn.statistics.
					rx.ofdm.plcp_err)) +
			    (le32_to_cpu(ofdm_ht->plcp_err) -
			    le32_to_cpu(priv->_agn.statistics.
					rx.ofdm_ht.plcp_err));
		}

		if ((combined_plcp_delta > 0) &&
		    ((combined_plcp_delta * 100) / plcp_msec) >
			priv->cfg->base_params->plcp_delta_threshold) {
			/*
			 * if plcp_err exceed the threshold,
			 * the following data is printed in csv format:
			 *    Text: plcp_err exceeded %d,
			 *    Received ofdm.plcp_err,
			 *    Current ofdm.plcp_err,
			 *    Received ofdm_ht.plcp_err,
			 *    Current ofdm_ht.plcp_err,
			 *    combined_plcp_delta,
			 *    plcp_msec
			 */
			IWL_DEBUG_RADIO(priv, "plcp_err exceeded %u, "
				"%u, %u, %u, %u, %d, %u mSecs\n",
				priv->cfg->base_params->plcp_delta_threshold,
				le32_to_cpu(ofdm->plcp_err),
				le32_to_cpu(ofdm->plcp_err),
				le32_to_cpu(ofdm_ht->plcp_err),
				le32_to_cpu(ofdm_ht->plcp_err),
				combined_plcp_delta, plcp_msec);

			rc = false;
		}
	}
	return rc;
}

void iwl_rx_statistics(struct iwl_priv *priv,
			      struct iwl_rx_mem_buffer *rxb)
{
	int change;
	struct iwl_rx_packet *pkt = rxb_addr(rxb);

	if (iwl_bt_statistics(priv)) {
		IWL_DEBUG_RX(priv,
			     "Statistics notification received (%d vs %d).\n",
			     (int)sizeof(struct iwl_bt_notif_statistics),
			     le32_to_cpu(pkt->len_n_flags) &
			     FH_RSCSR_FRAME_SIZE_MSK);

		change = ((priv->_agn.statistics_bt.general.common.temperature !=
			   pkt->u.stats_bt.general.common.temperature) ||
			   ((priv->_agn.statistics_bt.flag &
			   STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
			   (pkt->u.stats_bt.flag &
			   STATISTICS_REPLY_FLG_HT40_MODE_MSK)));
#ifdef CONFIG_IWLWIFI_DEBUGFS
		iwl_accumulative_statistics(priv, (__le32 *)&pkt->u.stats_bt);
#endif

	} else {
		IWL_DEBUG_RX(priv,
			     "Statistics notification received (%d vs %d).\n",
			     (int)sizeof(struct iwl_notif_statistics),
			     le32_to_cpu(pkt->len_n_flags) &
			     FH_RSCSR_FRAME_SIZE_MSK);

		change = ((priv->_agn.statistics.general.common.temperature !=
			   pkt->u.stats.general.common.temperature) ||
			   ((priv->_agn.statistics.flag &
			   STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
			   (pkt->u.stats.flag &
			   STATISTICS_REPLY_FLG_HT40_MODE_MSK)));
#ifdef CONFIG_IWLWIFI_DEBUGFS
		iwl_accumulative_statistics(priv, (__le32 *)&pkt->u.stats);
#endif

	}

	iwl_recover_from_statistics(priv, pkt);

	if (iwl_bt_statistics(priv))
		memcpy(&priv->_agn.statistics_bt, &pkt->u.stats_bt,
			sizeof(priv->_agn.statistics_bt));
	else
		memcpy(&priv->_agn.statistics, &pkt->u.stats,
			sizeof(priv->_agn.statistics));

	set_bit(STATUS_STATISTICS, &priv->status);

	/* Reschedule the statistics timer to occur in
	 * REG_RECALIB_PERIOD seconds to ensure we get a
	 * thermal update even if the uCode doesn't give
	 * us one */
	mod_timer(&priv->statistics_periodic, jiffies +
		  msecs_to_jiffies(REG_RECALIB_PERIOD * 1000));

	if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
	    (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
		iwl_rx_calc_noise(priv);
		queue_work(priv->workqueue, &priv->run_time_calib_work);
	}
	if (priv->cfg->ops->lib->temp_ops.temperature && change)
		priv->cfg->ops->lib->temp_ops.temperature(priv);
}

void iwl_reply_statistics(struct iwl_priv *priv,
			      struct iwl_rx_mem_buffer *rxb)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);

	if (le32_to_cpu(pkt->u.stats.flag) & UCODE_STATISTICS_CLEAR_MSK) {
#ifdef CONFIG_IWLWIFI_DEBUGFS
		memset(&priv->_agn.accum_statistics, 0,
			sizeof(struct iwl_notif_statistics));
		memset(&priv->_agn.delta_statistics, 0,
			sizeof(struct iwl_notif_statistics));
		memset(&priv->_agn.max_delta, 0,
			sizeof(struct iwl_notif_statistics));
		memset(&priv->_agn.accum_statistics_bt, 0,
			sizeof(struct iwl_bt_notif_statistics));
		memset(&priv->_agn.delta_statistics_bt, 0,
			sizeof(struct iwl_bt_notif_statistics));
		memset(&priv->_agn.max_delta_bt, 0,
			sizeof(struct iwl_bt_notif_statistics));
#endif
		IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
	}
	iwl_rx_statistics(priv, rxb);
}