rt2x00dev.c 32.1 KB
Newer Older
1
/*
2
	Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
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
	<http://rt2x00.serialmonkey.com>

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	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.,
	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*
	Module: rt2x00lib
	Abstract: rt2x00 generic device routines.
 */

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

#include "rt2x00.h"
#include "rt2x00lib.h"

/*
 * Link tuning handlers
 */
35
void rt2x00lib_reset_link_tuner(struct rt2x00_dev *rt2x00dev)
36
{
37
	if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
38 39 40 41 42 43 44 45 46 47
		return;

	/*
	 * Reset link information.
	 * Both the currently active vgc level as well as
	 * the link tuner counter should be reset. Resetting
	 * the counter is important for devices where the
	 * device should only perform link tuning during the
	 * first minute after being enabled.
	 */
48 49 50
	rt2x00dev->link.count = 0;
	rt2x00dev->link.vgc_level = 0;

51 52 53 54 55 56 57 58 59 60 61
	/*
	 * Reset the link tuner.
	 */
	rt2x00dev->ops->lib->reset_tuner(rt2x00dev);
}

static void rt2x00lib_start_link_tuner(struct rt2x00_dev *rt2x00dev)
{
	/*
	 * Clear all (possibly) pre-existing quality statistics.
	 */
62 63 64 65 66 67 68 69 70 71 72 73
	memset(&rt2x00dev->link.qual, 0, sizeof(rt2x00dev->link.qual));

	/*
	 * The RX and TX percentage should start at 50%
	 * this will assure we will get at least get some
	 * decent value when the link tuner starts.
	 * The value will be dropped and overwritten with
	 * the correct (measured )value anyway during the
	 * first run of the link tuner.
	 */
	rt2x00dev->link.qual.rx_percentage = 50;
	rt2x00dev->link.qual.tx_percentage = 50;
74

75
	rt2x00lib_reset_link_tuner(rt2x00dev);
76

77
	queue_delayed_work(rt2x00dev->hw->workqueue,
78 79 80 81 82
			   &rt2x00dev->link.work, LINK_TUNE_INTERVAL);
}

static void rt2x00lib_stop_link_tuner(struct rt2x00_dev *rt2x00dev)
{
83
	cancel_delayed_work_sync(&rt2x00dev->link.work);
84 85 86 87 88 89 90 91 92 93 94 95 96
}

/*
 * Radio control handlers.
 */
int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
{
	int status;

	/*
	 * Don't enable the radio twice.
	 * And check if the hardware button has been disabled.
	 */
97 98
	if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags) ||
	    test_bit(DEVICE_STATE_DISABLED_RADIO_HW, &rt2x00dev->flags))
99 100
		return 0;

101
	/*
102
	 * Initialize all data queues.
103
	 */
104
	rt2x00queue_init_queues(rt2x00dev);
105

106 107 108
	/*
	 * Enable radio.
	 */
109 110
	status =
	    rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_ON);
111 112 113
	if (status)
		return status;

114 115
	rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_ON);

116
	rt2x00leds_led_radio(rt2x00dev, true);
117
	rt2x00led_led_activity(rt2x00dev, true);
118

119
	set_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags);
120 121 122 123

	/*
	 * Enable RX.
	 */
124
	rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
125 126 127 128

	/*
	 * Start the TX queues.
	 */
129
	ieee80211_wake_queues(rt2x00dev->hw);
130 131 132 133 134 135

	return 0;
}

void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
{
136
	if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
137 138 139 140 141 142 143 144 145 146
		return;

	/*
	 * Stop the TX queues.
	 */
	ieee80211_stop_queues(rt2x00dev->hw);

	/*
	 * Disable RX.
	 */
147
	rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
148 149 150 151 152

	/*
	 * Disable radio.
	 */
	rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
153
	rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
154
	rt2x00led_led_activity(rt2x00dev, false);
155
	rt2x00leds_led_radio(rt2x00dev, false);
156 157
}

158
void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
159 160 161 162
{
	/*
	 * When we are disabling the RX, we should also stop the link tuner.
	 */
163
	if (state == STATE_RADIO_RX_OFF)
164 165 166 167 168 169 170
		rt2x00lib_stop_link_tuner(rt2x00dev);

	rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);

	/*
	 * When we are enabling the RX, we should also start the link tuner.
	 */
171
	if (state == STATE_RADIO_RX_ON &&
172
	    (rt2x00dev->intf_ap_count || rt2x00dev->intf_sta_count))
173 174 175
		rt2x00lib_start_link_tuner(rt2x00dev);
}

176 177
static void rt2x00lib_evaluate_antenna_sample(struct rt2x00_dev *rt2x00dev)
{
178
	struct antenna_setup ant;
179 180 181 182 183
	int sample_a =
	    rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_A);
	int sample_b =
	    rt2x00_get_link_ant_rssi_history(&rt2x00dev->link, ANTENNA_B);

184 185
	memcpy(&ant, &rt2x00dev->link.ant.active, sizeof(ant));

186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201
	/*
	 * We are done sampling. Now we should evaluate the results.
	 */
	rt2x00dev->link.ant.flags &= ~ANTENNA_MODE_SAMPLE;

	/*
	 * During the last period we have sampled the RSSI
	 * from both antenna's. It now is time to determine
	 * which antenna demonstrated the best performance.
	 * When we are already on the antenna with the best
	 * performance, then there really is nothing for us
	 * left to do.
	 */
	if (sample_a == sample_b)
		return;

202
	if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
203
		ant.rx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
204

205
	if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
206
		ant.tx = (sample_a > sample_b) ? ANTENNA_A : ANTENNA_B;
207

208
	rt2x00lib_config_antenna(rt2x00dev, &ant);
209 210 211 212
}

static void rt2x00lib_evaluate_antenna_eval(struct rt2x00_dev *rt2x00dev)
{
213
	struct antenna_setup ant;
214 215 216
	int rssi_curr = rt2x00_get_link_ant_rssi(&rt2x00dev->link);
	int rssi_old = rt2x00_update_ant_rssi(&rt2x00dev->link, rssi_curr);

217 218
	memcpy(&ant, &rt2x00dev->link.ant.active, sizeof(ant));

219 220 221 222 223 224 225 226 227
	/*
	 * Legacy driver indicates that we should swap antenna's
	 * when the difference in RSSI is greater that 5. This
	 * also should be done when the RSSI was actually better
	 * then the previous sample.
	 * When the difference exceeds the threshold we should
	 * sample the rssi from the other antenna to make a valid
	 * comparison between the 2 antennas.
	 */
Ivo van Doorn's avatar
Ivo van Doorn committed
228
	if (abs(rssi_curr - rssi_old) < 5)
229 230 231 232 233
		return;

	rt2x00dev->link.ant.flags |= ANTENNA_MODE_SAMPLE;

	if (rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY)
234
		ant.rx = (ant.rx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
235 236

	if (rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)
237
		ant.tx = (ant.tx == ANTENNA_A) ? ANTENNA_B : ANTENNA_A;
238

239
	rt2x00lib_config_antenna(rt2x00dev, &ant);
240 241 242 243 244 245 246 247 248 249 250 251 252
}

static void rt2x00lib_evaluate_antenna(struct rt2x00_dev *rt2x00dev)
{
	/*
	 * Determine if software diversity is enabled for
	 * either the TX or RX antenna (or both).
	 * Always perform this check since within the link
	 * tuner interval the configuration might have changed.
	 */
	rt2x00dev->link.ant.flags &= ~ANTENNA_RX_DIVERSITY;
	rt2x00dev->link.ant.flags &= ~ANTENNA_TX_DIVERSITY;

253
	if (rt2x00dev->default_ant.rx == ANTENNA_SW_DIVERSITY)
254
		rt2x00dev->link.ant.flags |= ANTENNA_RX_DIVERSITY;
255
	if (rt2x00dev->default_ant.tx == ANTENNA_SW_DIVERSITY)
256 257 258 259
		rt2x00dev->link.ant.flags |= ANTENNA_TX_DIVERSITY;

	if (!(rt2x00dev->link.ant.flags & ANTENNA_RX_DIVERSITY) &&
	    !(rt2x00dev->link.ant.flags & ANTENNA_TX_DIVERSITY)) {
260
		rt2x00dev->link.ant.flags = 0;
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
		return;
	}

	/*
	 * If we have only sampled the data over the last period
	 * we should now harvest the data. Otherwise just evaluate
	 * the data. The latter should only be performed once
	 * every 2 seconds.
	 */
	if (rt2x00dev->link.ant.flags & ANTENNA_MODE_SAMPLE)
		rt2x00lib_evaluate_antenna_sample(rt2x00dev);
	else if (rt2x00dev->link.count & 1)
		rt2x00lib_evaluate_antenna_eval(rt2x00dev);
}

static void rt2x00lib_update_link_stats(struct link *link, int rssi)
{
	int avg_rssi = rssi;

	/*
	 * Update global RSSI
	 */
	if (link->qual.avg_rssi)
		avg_rssi = MOVING_AVERAGE(link->qual.avg_rssi, rssi, 8);
	link->qual.avg_rssi = avg_rssi;

	/*
	 * Update antenna RSSI
	 */
	if (link->ant.rssi_ant)
		rssi = MOVING_AVERAGE(link->ant.rssi_ant, rssi, 8);
	link->ant.rssi_ant = rssi;
}

295
static void rt2x00lib_precalculate_link_signal(struct link_qual *qual)
296
{
297 298 299 300
	if (qual->rx_failed || qual->rx_success)
		qual->rx_percentage =
		    (qual->rx_success * 100) /
		    (qual->rx_failed + qual->rx_success);
301
	else
302
		qual->rx_percentage = 50;
303

304 305 306 307
	if (qual->tx_failed || qual->tx_success)
		qual->tx_percentage =
		    (qual->tx_success * 100) /
		    (qual->tx_failed + qual->tx_success);
308
	else
309
		qual->tx_percentage = 50;
310

311 312 313 314
	qual->rx_success = 0;
	qual->rx_failed = 0;
	qual->tx_success = 0;
	qual->tx_failed = 0;
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
}

static int rt2x00lib_calculate_link_signal(struct rt2x00_dev *rt2x00dev,
					   int rssi)
{
	int rssi_percentage = 0;
	int signal;

	/*
	 * We need a positive value for the RSSI.
	 */
	if (rssi < 0)
		rssi += rt2x00dev->rssi_offset;

	/*
	 * Calculate the different percentages,
	 * which will be used for the signal.
	 */
	if (rt2x00dev->rssi_offset)
		rssi_percentage = (rssi * 100) / rt2x00dev->rssi_offset;

	/*
	 * Add the individual percentages and use the WEIGHT
	 * defines to calculate the current link signal.
	 */
	signal = ((WEIGHT_RSSI * rssi_percentage) +
341 342
		  (WEIGHT_TX * rt2x00dev->link.qual.tx_percentage) +
		  (WEIGHT_RX * rt2x00dev->link.qual.rx_percentage)) / 100;
343 344 345 346 347 348 349 350 351

	return (signal > 100) ? 100 : signal;
}

static void rt2x00lib_link_tuner(struct work_struct *work)
{
	struct rt2x00_dev *rt2x00dev =
	    container_of(work, struct rt2x00_dev, link.work.work);

352 353 354 355
	/*
	 * When the radio is shutting down we should
	 * immediately cease all link tuning.
	 */
356
	if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
357 358
		return;

359 360 361
	/*
	 * Update statistics.
	 */
362
	rt2x00dev->ops->lib->link_stats(rt2x00dev, &rt2x00dev->link.qual);
363
	rt2x00dev->low_level_stats.dot11FCSErrorCount +=
364
	    rt2x00dev->link.qual.rx_failed;
365 366 367 368 369 370 371 372

	/*
	 * Only perform the link tuning when Link tuning
	 * has been enabled (This could have been disabled from the EEPROM).
	 */
	if (!test_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags))
		rt2x00dev->ops->lib->link_tuner(rt2x00dev);

373 374 375 376
	/*
	 * Precalculate a portion of the link signal which is
	 * in based on the tx/rx success/failure counters.
	 */
377
	rt2x00lib_precalculate_link_signal(&rt2x00dev->link.qual);
378

379 380 381 382 383
	/*
	 * Send a signal to the led to update the led signal strength.
	 */
	rt2x00leds_led_quality(rt2x00dev, rt2x00dev->link.qual.avg_rssi);

384 385 386 387 388 389
	/*
	 * Evaluate antenna setup, make this the last step since this could
	 * possibly reset some statistics.
	 */
	rt2x00lib_evaluate_antenna(rt2x00dev);

390 391 392 393
	/*
	 * Increase tuner counter, and reschedule the next link tuner run.
	 */
	rt2x00dev->link.count++;
394
	queue_delayed_work(rt2x00dev->hw->workqueue,
395
			   &rt2x00dev->link.work, LINK_TUNE_INTERVAL);
396 397
}

398 399 400 401
static void rt2x00lib_packetfilter_scheduled(struct work_struct *work)
{
	struct rt2x00_dev *rt2x00dev =
	    container_of(work, struct rt2x00_dev, filter_work);
402

403
	rt2x00dev->ops->lib->config_filter(rt2x00dev, rt2x00dev->packet_filter);
404 405
}

406 407
static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
					  struct ieee80211_vif *vif)
408
{
409 410 411 412 413 414 415 416 417 418 419 420
	struct rt2x00_dev *rt2x00dev = data;
	struct rt2x00_intf *intf = vif_to_intf(vif);
	struct ieee80211_bss_conf conf;
	int delayed_flags;

	/*
	 * Copy all data we need during this action under the protection
	 * of a spinlock. Otherwise race conditions might occur which results
	 * into an invalid configuration.
	 */
	spin_lock(&intf->lock);

421
	memcpy(&conf, &vif->bss_conf, sizeof(conf));
422 423 424 425 426
	delayed_flags = intf->delayed_flags;
	intf->delayed_flags = 0;

	spin_unlock(&intf->lock);

427 428 429 430 431 432
	/*
	 * It is possible the radio was disabled while the work had been
	 * scheduled. If that happens we should return here immediately,
	 * note that in the spinlock protected area above the delayed_flags
	 * have been cleared correctly.
	 */
433
	if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
434 435
		return;

436 437
	if (delayed_flags & DELAYED_UPDATE_BEACON)
		rt2x00queue_update_beacon(rt2x00dev, vif);
438

439
	if (delayed_flags & DELAYED_CONFIG_ERP)
440
		rt2x00lib_config_erp(rt2x00dev, intf, &conf);
441 442 443

	if (delayed_flags & DELAYED_LED_ASSOC)
		rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
444
}
445

446 447 448 449
static void rt2x00lib_intf_scheduled(struct work_struct *work)
{
	struct rt2x00_dev *rt2x00dev =
	    container_of(work, struct rt2x00_dev, intf_work);
450 451

	/*
452 453
	 * Iterate over each interface and perform the
	 * requested configurations.
454
	 */
455 456 457
	ieee80211_iterate_active_interfaces(rt2x00dev->hw,
					    rt2x00lib_intf_scheduled_iter,
					    rt2x00dev);
458 459
}

460 461 462
/*
 * Interrupt context handlers.
 */
463 464
static void rt2x00lib_beacondone_iter(void *data, u8 *mac,
				      struct ieee80211_vif *vif)
465
{
466
	struct rt2x00_dev *rt2x00dev = data;
467
	struct rt2x00_intf *intf = vif_to_intf(vif);
468

469 470
	if (vif->type != NL80211_IFTYPE_AP &&
	    vif->type != NL80211_IFTYPE_ADHOC)
471 472
		return;

473 474 475
	/*
	 * Clean up the beacon skb.
	 */
476
	rt2x00queue_free_skb(rt2x00dev, intf->beacon->skb);
477 478
	intf->beacon->skb = NULL;

479 480 481
	spin_lock(&intf->lock);
	intf->delayed_flags |= DELAYED_UPDATE_BEACON;
	spin_unlock(&intf->lock);
482 483 484 485
}

void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
{
486
	if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
487 488
		return;

489 490 491
	ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
						   rt2x00lib_beacondone_iter,
						   rt2x00dev);
492

493
	schedule_work(&rt2x00dev->intf_work);
494 495 496
}
EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);

497 498
void rt2x00lib_txdone(struct queue_entry *entry,
		      struct txdone_entry_desc *txdesc)
499
{
500
	struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
501
	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
502
	struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
Ivo van Doorn's avatar
Ivo van Doorn committed
503
	enum data_queue_qid qid = skb_get_queue_mapping(entry->skb);
504
	u8 rate_idx, rate_flags;
Ivo van Doorn's avatar
Ivo van Doorn committed
505 506 507 508 509

	/*
	 * Unmap the skb.
	 */
	rt2x00queue_unmap_skb(rt2x00dev, entry->skb);
510

511 512 513 514 515 516 517 518 519
	/*
	 * If the IV/EIV data was stripped from the frame before it was
	 * passed to the hardware, we should now reinsert it again because
	 * mac80211 will expect the the same data to be present it the
	 * frame as it was passed to us.
	 */
	if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
		rt2x00crypto_tx_insert_iv(entry->skb);

520 521 522 523 524
	/*
	 * Send frame to debugfs immediately, after this call is completed
	 * we are going to overwrite the skb->cb array.
	 */
	rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
525 526 527 528

	/*
	 * Update TX statistics.
	 */
529 530 531
	rt2x00dev->link.qual.tx_success +=
	    test_bit(TXDONE_SUCCESS, &txdesc->flags);
	rt2x00dev->link.qual.tx_failed +=
532
	    test_bit(TXDONE_FAILURE, &txdesc->flags);
533

534 535 536
	rate_idx = skbdesc->tx_rate_idx;
	rate_flags = skbdesc->tx_rate_flags;

537 538 539
	/*
	 * Initialize TX status
	 */
540 541
	memset(&tx_info->status, 0, sizeof(tx_info->status));
	tx_info->status.ack_signal = 0;
542 543 544 545
	tx_info->status.rates[0].idx = rate_idx;
	tx_info->status.rates[0].flags = rate_flags;
	tx_info->status.rates[0].count = txdesc->retry + 1;
	tx_info->status.rates[1].idx = -1; /* terminate */
546

547
	if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
548
		if (test_bit(TXDONE_SUCCESS, &txdesc->flags))
549
			tx_info->flags |= IEEE80211_TX_STAT_ACK;
550
		else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
551
			rt2x00dev->low_level_stats.dot11ACKFailureCount++;
552 553
	}

554
	if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
555
		if (test_bit(TXDONE_SUCCESS, &txdesc->flags))
556
			rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
557
		else if (test_bit(TXDONE_FAILURE, &txdesc->flags))
558
			rt2x00dev->low_level_stats.dot11RTSFailureCount++;
559 560 561
	}

	/*
562 563 564 565
	 * Only send the status report to mac80211 when TX status was
	 * requested by it. If this was a extra frame coming through
	 * a mac80211 library call (RTS/CTS) then we should not send the
	 * status report back.
566
	 */
567 568
	if (tx_info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)
		ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb);
569
	else
570
		dev_kfree_skb_irq(entry->skb);
Ivo van Doorn's avatar
Ivo van Doorn committed
571 572 573 574

	/*
	 * Make this entry available for reuse.
	 */
575
	entry->skb = NULL;
Ivo van Doorn's avatar
Ivo van Doorn committed
576 577
	entry->flags = 0;

578
	rt2x00dev->ops->lib->clear_entry(entry);
Ivo van Doorn's avatar
Ivo van Doorn committed
579

580
	clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
Ivo van Doorn's avatar
Ivo van Doorn committed
581 582 583 584 585 586 587 588 589
	rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);

	/*
	 * If the data queue was below the threshold before the txdone
	 * handler we must make sure the packet queue in the mac80211 stack
	 * is reenabled when the txdone handler has finished.
	 */
	if (!rt2x00queue_threshold(entry->queue))
		ieee80211_wake_queue(rt2x00dev->hw, qid);
590 591 592
}
EXPORT_SYMBOL_GPL(rt2x00lib_txdone);

593 594
void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
		      struct queue_entry *entry)
595
{
596 597
	struct rxdone_entry_desc rxdesc;
	struct sk_buff *skb;
598
	struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
599
	struct ieee80211_supported_band *sband;
600
	struct ieee80211_hdr *hdr;
601
	const struct rt2x00_rate *rate;
602
	unsigned int header_length;
603
	unsigned int align;
604
	unsigned int i;
605
	int idx = -1;
606

607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624
	/*
	 * Allocate a new sk_buffer. If no new buffer available, drop the
	 * received frame and reuse the existing buffer.
	 */
	skb = rt2x00queue_alloc_rxskb(rt2x00dev, entry);
	if (!skb)
		return;

	/*
	 * Unmap the skb.
	 */
	rt2x00queue_unmap_skb(rt2x00dev, entry->skb);

	/*
	 * Extract the RXD details.
	 */
	memset(&rxdesc, 0, sizeof(rxdesc));
	rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
625

626 627
	/*
	 * The data behind the ieee80211 header must be
628
	 * aligned on a 4 byte boundary.
629
	 */
630 631
	header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
	align = ((unsigned long)(entry->skb->data + header_length)) & 3;
632

633 634 635 636 637 638 639 640 641 642
	/*
	 * Hardware might have stripped the IV/EIV/ICV data,
	 * in that case it is possible that the data was
	 * provided seperately (through hardware descriptor)
	 * in which case we should reinsert the data into the frame.
	 */
	if ((rxdesc.flags & RX_FLAG_IV_STRIPPED)) {
		rt2x00crypto_rx_insert_iv(entry->skb, align,
					  header_length, &rxdesc);
	} else if (align) {
643 644 645
		skb_push(entry->skb, align);
		/* Move entire frame in 1 command */
		memmove(entry->skb->data, entry->skb->data + align,
646
			rxdesc.size);
647 648 649
	}

	/* Update data pointers, trim buffer to correct size */
650
	skb_trim(entry->skb, rxdesc.size);
651

652 653 654
	/*
	 * Update RX statistics.
	 */
655 656
	sband = &rt2x00dev->bands[rt2x00dev->curr_band];
	for (i = 0; i < sband->n_bitrates; i++) {
657
		rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
658

659 660
		if (((rxdesc.dev_flags & RXDONE_SIGNAL_PLCP) &&
		     (rate->plcp == rxdesc.signal)) ||
Ivo van Doorn's avatar
Ivo van Doorn committed
661
		    ((rxdesc.dev_flags & RXDONE_SIGNAL_BITRATE) &&
662
		      (rate->bitrate == rxdesc.signal))) {
663
			idx = i;
664 665 666 667
			break;
		}
	}

668 669
	if (idx < 0) {
		WARNING(rt2x00dev, "Frame received with unrecognized signal,"
670 671
			"signal=0x%.2x, plcp=%d.\n", rxdesc.signal,
			!!(rxdesc.dev_flags & RXDONE_SIGNAL_PLCP));
672 673 674
		idx = 0;
	}

675
	/*
676
	 * Only update link status if this is a beacon frame carrying our bssid.
677
	 */
678
	hdr = (struct ieee80211_hdr *)entry->skb->data;
679
	if (ieee80211_is_beacon(hdr->frame_control) &&
680 681
	    (rxdesc.dev_flags & RXDONE_MY_BSS))
		rt2x00lib_update_link_stats(&rt2x00dev->link, rxdesc.rssi);
682

683 684 685 686
	rt2x00debug_update_crypto(rt2x00dev,
				  rxdesc.cipher,
				  rxdesc.cipher_status);

687
	rt2x00dev->link.qual.rx_success++;
688

689
	rx_status->mactime = rxdesc.timestamp;
690
	rx_status->rate_idx = idx;
691
	rx_status->qual =
692 693 694
	    rt2x00lib_calculate_link_signal(rt2x00dev, rxdesc.rssi);
	rx_status->signal = rxdesc.rssi;
	rx_status->flag = rxdesc.flags;
695
	rx_status->antenna = rt2x00dev->link.ant.active.rx;
696 697

	/*
698 699
	 * Send frame to mac80211 & debugfs.
	 * mac80211 will clean up the skb structure.
700
	 */
701
	rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
702
	ieee80211_rx_irqsafe(rt2x00dev->hw, entry->skb, rx_status);
703 704 705 706 707

	/*
	 * Replace the skb with the freshly allocated one.
	 */
	entry->skb = skb;
Ivo van Doorn's avatar
Ivo van Doorn committed
708 709
	entry->flags = 0;

710
	rt2x00dev->ops->lib->clear_entry(entry);
Ivo van Doorn's avatar
Ivo van Doorn committed
711 712

	rt2x00queue_index_inc(entry->queue, Q_INDEX);
713 714 715 716 717 718
}
EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);

/*
 * Driver initialization handlers.
 */
719 720
const struct rt2x00_rate rt2x00_supported_rates[12] = {
	{
Ivo van Doorn's avatar
Ivo van Doorn committed
721
		.flags = DEV_RATE_CCK,
722
		.bitrate = 10,
723
		.ratemask = BIT(0),
724 725 726
		.plcp = 0x00,
	},
	{
Ivo van Doorn's avatar
Ivo van Doorn committed
727
		.flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
728
		.bitrate = 20,
729
		.ratemask = BIT(1),
730 731 732
		.plcp = 0x01,
	},
	{
Ivo van Doorn's avatar
Ivo van Doorn committed
733
		.flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
734
		.bitrate = 55,
735
		.ratemask = BIT(2),
736 737 738
		.plcp = 0x02,
	},
	{
Ivo van Doorn's avatar
Ivo van Doorn committed
739
		.flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
740
		.bitrate = 110,
741
		.ratemask = BIT(3),
742 743 744
		.plcp = 0x03,
	},
	{
Ivo van Doorn's avatar
Ivo van Doorn committed
745
		.flags = DEV_RATE_OFDM,
746
		.bitrate = 60,
747
		.ratemask = BIT(4),
748 749 750 751 752
		.plcp = 0x0b,
	},
	{
		.flags = DEV_RATE_OFDM,
		.bitrate = 90,
753
		.ratemask = BIT(5),
754 755 756
		.plcp = 0x0f,
	},
	{
Ivo van Doorn's avatar
Ivo van Doorn committed
757
		.flags = DEV_RATE_OFDM,
758
		.bitrate = 120,
759
		.ratemask = BIT(6),
760 761 762 763 764
		.plcp = 0x0a,
	},
	{
		.flags = DEV_RATE_OFDM,
		.bitrate = 180,
765
		.ratemask = BIT(7),
766 767 768
		.plcp = 0x0e,
	},
	{
Ivo van Doorn's avatar
Ivo van Doorn committed
769
		.flags = DEV_RATE_OFDM,
770
		.bitrate = 240,
771
		.ratemask = BIT(8),
772 773 774 775 776
		.plcp = 0x09,
	},
	{
		.flags = DEV_RATE_OFDM,
		.bitrate = 360,
777
		.ratemask = BIT(9),
778 779 780 781 782
		.plcp = 0x0d,
	},
	{
		.flags = DEV_RATE_OFDM,
		.bitrate = 480,
783
		.ratemask = BIT(10),
784 785 786 787 788
		.plcp = 0x08,
	},
	{
		.flags = DEV_RATE_OFDM,
		.bitrate = 540,
789
		.ratemask = BIT(11),
790 791 792 793
		.plcp = 0x0c,
	},
};

794 795 796 797
static void rt2x00lib_channel(struct ieee80211_channel *entry,
			      const int channel, const int tx_power,
			      const int value)
{
798
	entry->center_freq = ieee80211_channel_to_frequency(channel);
799 800 801
	entry->hw_value = value;
	entry->max_power = tx_power;
	entry->max_antenna_gain = 0xff;
802 803 804
}

static void rt2x00lib_rate(struct ieee80211_rate *entry,
805
			   const u16 index, const struct rt2x00_rate *rate)
806
{
807 808 809
	entry->flags = 0;
	entry->bitrate = rate->bitrate;
	entry->hw_value = rt2x00_create_rate_hw_value(index, 0);
810
	entry->hw_value_short = entry->hw_value;
811 812 813 814 815

	if (rate->flags & DEV_RATE_SHORT_PREAMBLE) {
		entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
		entry->hw_value_short |= rt2x00_create_rate_hw_value(index, 1);
	}
816 817 818 819 820 821 822 823
}

static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
				    struct hw_mode_spec *spec)
{
	struct ieee80211_hw *hw = rt2x00dev->hw;
	struct ieee80211_channel *channels;
	struct ieee80211_rate *rates;
824
	unsigned int num_rates;
825 826
	unsigned int i;

827 828 829 830 831
	num_rates = 0;
	if (spec->supported_rates & SUPPORT_RATE_CCK)
		num_rates += 4;
	if (spec->supported_rates & SUPPORT_RATE_OFDM)
		num_rates += 8;
832 833 834

	channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
	if (!channels)
835
		return -ENOMEM;
836

837
	rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
838 839 840 841 842 843
	if (!rates)
		goto exit_free_channels;

	/*
	 * Initialize Rate list.
	 */
844
	for (i = 0; i < num_rates; i++)
845
		rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
846 847 848 849 850 851

	/*
	 * Initialize Channel list.
	 */
	for (i = 0; i < spec->num_channels; i++) {
		rt2x00lib_channel(&channels[i],
852 853
				  spec->channels[i].channel,
				  spec->channels_info[i].tx_power1, i);
854 855 856
	}

	/*
857
	 * Intitialize 802.11b, 802.11g
858
	 * Rates: CCK, OFDM.
859
	 * Channels: 2.4 GHz
860
	 */
861
	if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
862 863 864 865 866 867
		rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
		rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
		rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
		rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
		hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
		    &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
868 869 870 871 872 873 874
	}

	/*
	 * Intitialize 802.11a
	 * Rates: OFDM.
	 * Channels: OFDM, UNII, HiperLAN2.
	 */
875
	if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
876 877 878 879 880 881 882 883
		rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
		    spec->num_channels - 14;
		rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
		    num_rates - 4;
		rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
		rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
		hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
		    &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
884 885 886 887
	}

	return 0;

888
 exit_free_channels:
889 890 891 892 893 894 895
	kfree(channels);
	ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
	return -ENOMEM;
}

static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
{
896
	if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
897 898
		ieee80211_unregister_hw(rt2x00dev->hw);

899 900 901 902 903
	if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
		kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
		kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
		rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
		rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
904
	}
905 906

	kfree(rt2x00dev->spec.channels_info);
907 908 909 910 911 912 913
}

static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
{
	struct hw_mode_spec *spec = &rt2x00dev->spec;
	int status;

914 915 916
	if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
		return 0;

917 918 919 920 921 922 923
	/*
	 * Initialize HW modes.
	 */
	status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
	if (status)
		return status;

924 925 926 927 928
	/*
	 * Initialize HW fields.
	 */
	rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;

929 930 931 932 933 934 935 936 937
	/*
	 * Register HW.
	 */
	status = ieee80211_register_hw(rt2x00dev->hw);
	if (status) {
		rt2x00lib_remove_hw(rt2x00dev);
		return status;
	}

938
	set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
939 940 941 942 943 944 945

	return 0;
}

/*
 * Initialization/uninitialization handlers.
 */
946
static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
947
{
948
	if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
949 950 951
		return;

	/*
952
	 * Unregister extra components.
953 954 955 956 957 958 959 960 961
	 */
	rt2x00rfkill_unregister(rt2x00dev);

	/*