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1/*
2 Copyright (C) 2010 Willow Garage <http://www.willowgarage.com>
3 Copyright (C) 2004 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
4 <http://rt2x00.serialmonkey.com>
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the
18 Free Software Foundation, Inc.,
19 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 */
21
22/*
23 Module: rt2x00lib
24 Abstract: rt2x00 generic device routines.
25 */
26
27#include <linux/kernel.h>
28#include <linux/module.h>
29#include <linux/slab.h>
30#include <linux/log2.h>
31
32#include "rt2x00.h"
33#include "rt2x00lib.h"
34
35/*
36 * Radio control handlers.
37 */
38int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
39{
40 int status;
41
42 /*
43 * Don't enable the radio twice.
44 * And check if the hardware button has been disabled.
45 */
46 if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
47 return 0;
48
49 /*
50 * Initialize all data queues.
51 */
52 rt2x00queue_init_queues(rt2x00dev);
53
54 /*
55 * Enable radio.
56 */
57 status =
58 rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_ON);
59 if (status)
60 return status;
61
62 rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_ON);
63
64 rt2x00leds_led_radio(rt2x00dev, true);
65 rt2x00led_led_activity(rt2x00dev, true);
66
67 set_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags);
68
69 /*
70 * Enable queues.
71 */
72 rt2x00queue_start_queues(rt2x00dev);
73 rt2x00link_start_tuner(rt2x00dev);
74 rt2x00link_start_agc(rt2x00dev);
75
76 /*
77 * Start watchdog monitoring.
78 */
79 rt2x00link_start_watchdog(rt2x00dev);
80
81 return 0;
82}
83
84void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
85{
86 if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
87 return;
88
89 /*
90 * Stop watchdog monitoring.
91 */
92 rt2x00link_stop_watchdog(rt2x00dev);
93
94 /*
95 * Stop all queues
96 */
97 rt2x00link_stop_agc(rt2x00dev);
98 rt2x00link_stop_tuner(rt2x00dev);
99 rt2x00queue_stop_queues(rt2x00dev);
100 rt2x00queue_flush_queues(rt2x00dev, true);
101
102 /*
103 * Disable radio.
104 */
105 rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
106 rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
107 rt2x00led_led_activity(rt2x00dev, false);
108 rt2x00leds_led_radio(rt2x00dev, false);
109}
110
111static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
112 struct ieee80211_vif *vif)
113{
114 struct rt2x00_dev *rt2x00dev = data;
115 struct rt2x00_intf *intf = vif_to_intf(vif);
116
117 /*
118 * It is possible the radio was disabled while the work had been
119 * scheduled. If that happens we should return here immediately,
120 * note that in the spinlock protected area above the delayed_flags
121 * have been cleared correctly.
122 */
123 if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
124 return;
125
126 if (test_and_clear_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags))
127 rt2x00queue_update_beacon(rt2x00dev, vif);
128}
129
130static void rt2x00lib_intf_scheduled(struct work_struct *work)
131{
132 struct rt2x00_dev *rt2x00dev =
133 container_of(work, struct rt2x00_dev, intf_work);
134
135 /*
136 * Iterate over each interface and perform the
137 * requested configurations.
138 */
139 ieee80211_iterate_active_interfaces(rt2x00dev->hw,
140 rt2x00lib_intf_scheduled_iter,
141 rt2x00dev);
142}
143
144static void rt2x00lib_autowakeup(struct work_struct *work)
145{
146 struct rt2x00_dev *rt2x00dev =
147 container_of(work, struct rt2x00_dev, autowakeup_work.work);
148
149 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
150 return;
151
152 if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_AWAKE))
153 ERROR(rt2x00dev, "Device failed to wakeup.\n");
154 clear_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
155}
156
157/*
158 * Interrupt context handlers.
159 */
160static void rt2x00lib_bc_buffer_iter(void *data, u8 *mac,
161 struct ieee80211_vif *vif)
162{
163 struct rt2x00_dev *rt2x00dev = data;
164 struct sk_buff *skb;
165
166 /*
167 * Only AP mode interfaces do broad- and multicast buffering
168 */
169 if (vif->type != NL80211_IFTYPE_AP)
170 return;
171
172 /*
173 * Send out buffered broad- and multicast frames
174 */
175 skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
176 while (skb) {
177 rt2x00mac_tx(rt2x00dev->hw, skb);
178 skb = ieee80211_get_buffered_bc(rt2x00dev->hw, vif);
179 }
180}
181
182static void rt2x00lib_beaconupdate_iter(void *data, u8 *mac,
183 struct ieee80211_vif *vif)
184{
185 struct rt2x00_dev *rt2x00dev = data;
186
187 if (vif->type != NL80211_IFTYPE_AP &&
188 vif->type != NL80211_IFTYPE_ADHOC &&
189 vif->type != NL80211_IFTYPE_MESH_POINT &&
190 vif->type != NL80211_IFTYPE_WDS)
191 return;
192
193 /*
194 * Update the beacon without locking. This is safe on PCI devices
195 * as they only update the beacon periodically here. This should
196 * never be called for USB devices.
197 */
198 WARN_ON(rt2x00_is_usb(rt2x00dev));
199 rt2x00queue_update_beacon_locked(rt2x00dev, vif);
200}
201
202void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
203{
204 if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
205 return;
206
207 /* send buffered bc/mc frames out for every bssid */
208 ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
209 rt2x00lib_bc_buffer_iter,
210 rt2x00dev);
211 /*
212 * Devices with pre tbtt interrupt don't need to update the beacon
213 * here as they will fetch the next beacon directly prior to
214 * transmission.
215 */
216 if (test_bit(CAPABILITY_PRE_TBTT_INTERRUPT, &rt2x00dev->cap_flags))
217 return;
218
219 /* fetch next beacon */
220 ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
221 rt2x00lib_beaconupdate_iter,
222 rt2x00dev);
223}
224EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);
225
226void rt2x00lib_pretbtt(struct rt2x00_dev *rt2x00dev)
227{
228 if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
229 return;
230
231 /* fetch next beacon */
232 ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
233 rt2x00lib_beaconupdate_iter,
234 rt2x00dev);
235}
236EXPORT_SYMBOL_GPL(rt2x00lib_pretbtt);
237
238void rt2x00lib_dmastart(struct queue_entry *entry)
239{
240 set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
241 rt2x00queue_index_inc(entry, Q_INDEX);
242}
243EXPORT_SYMBOL_GPL(rt2x00lib_dmastart);
244
245void rt2x00lib_dmadone(struct queue_entry *entry)
246{
247 set_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags);
248 clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
249 rt2x00queue_index_inc(entry, Q_INDEX_DMA_DONE);
250}
251EXPORT_SYMBOL_GPL(rt2x00lib_dmadone);
252
253void rt2x00lib_txdone(struct queue_entry *entry,
254 struct txdone_entry_desc *txdesc)
255{
256 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
257 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
258 struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
259 unsigned int header_length, i;
260 u8 rate_idx, rate_flags, retry_rates;
261 u8 skbdesc_flags = skbdesc->flags;
262 bool success;
263
264 /*
265 * Unmap the skb.
266 */
267 rt2x00queue_unmap_skb(entry);
268
269 /*
270 * Remove the extra tx headroom from the skb.
271 */
272 skb_pull(entry->skb, rt2x00dev->ops->extra_tx_headroom);
273
274 /*
275 * Signal that the TX descriptor is no longer in the skb.
276 */
277 skbdesc->flags &= ~SKBDESC_DESC_IN_SKB;
278
279 /*
280 * Determine the length of 802.11 header.
281 */
282 header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
283
284 /*
285 * Remove L2 padding which was added during
286 */
287 if (test_bit(REQUIRE_L2PAD, &rt2x00dev->cap_flags))
288 rt2x00queue_remove_l2pad(entry->skb, header_length);
289
290 /*
291 * If the IV/EIV data was stripped from the frame before it was
292 * passed to the hardware, we should now reinsert it again because
293 * mac80211 will expect the same data to be present it the
294 * frame as it was passed to us.
295 */
296 if (test_bit(CAPABILITY_HW_CRYPTO, &rt2x00dev->cap_flags))
297 rt2x00crypto_tx_insert_iv(entry->skb, header_length);
298
299 /*
300 * Send frame to debugfs immediately, after this call is completed
301 * we are going to overwrite the skb->cb array.
302 */
303 rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);
304
305 /*
306 * Determine if the frame has been successfully transmitted.
307 */
308 success =
309 test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
310 test_bit(TXDONE_UNKNOWN, &txdesc->flags);
311
312 /*
313 * Update TX statistics.
314 */
315 rt2x00dev->link.qual.tx_success += success;
316 rt2x00dev->link.qual.tx_failed += !success;
317
318 rate_idx = skbdesc->tx_rate_idx;
319 rate_flags = skbdesc->tx_rate_flags;
320 retry_rates = test_bit(TXDONE_FALLBACK, &txdesc->flags) ?
321 (txdesc->retry + 1) : 1;
322
323 /*
324 * Initialize TX status
325 */
326 memset(&tx_info->status, 0, sizeof(tx_info->status));
327 tx_info->status.ack_signal = 0;
328
329 /*
330 * Frame was send with retries, hardware tried
331 * different rates to send out the frame, at each
332 * retry it lowered the rate 1 step except when the
333 * lowest rate was used.
334 */
335 for (i = 0; i < retry_rates && i < IEEE80211_TX_MAX_RATES; i++) {
336 tx_info->status.rates[i].idx = rate_idx - i;
337 tx_info->status.rates[i].flags = rate_flags;
338
339 if (rate_idx - i == 0) {
340 /*
341 * The lowest rate (index 0) was used until the
342 * number of max retries was reached.
343 */
344 tx_info->status.rates[i].count = retry_rates - i;
345 i++;
346 break;
347 }
348 tx_info->status.rates[i].count = 1;
349 }
350 if (i < (IEEE80211_TX_MAX_RATES - 1))
351 tx_info->status.rates[i].idx = -1; /* terminate */
352
353 if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
354 if (success)
355 tx_info->flags |= IEEE80211_TX_STAT_ACK;
356 else
357 rt2x00dev->low_level_stats.dot11ACKFailureCount++;
358 }
359
360 /*
361 * Every single frame has it's own tx status, hence report
362 * every frame as ampdu of size 1.
363 *
364 * TODO: if we can find out how many frames were aggregated
365 * by the hw we could provide the real ampdu_len to mac80211
366 * which would allow the rc algorithm to better decide on
367 * which rates are suitable.
368 */
369 if (test_bit(TXDONE_AMPDU, &txdesc->flags) ||
370 tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
371 tx_info->flags |= IEEE80211_TX_STAT_AMPDU;
372 tx_info->status.ampdu_len = 1;
373 tx_info->status.ampdu_ack_len = success ? 1 : 0;
374
375 if (!success)
376 tx_info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
377 }
378
379 if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
380 if (success)
381 rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
382 else
383 rt2x00dev->low_level_stats.dot11RTSFailureCount++;
384 }
385
386 /*
387 * Only send the status report to mac80211 when it's a frame
388 * that originated in mac80211. If this was a extra frame coming
389 * through a mac80211 library call (RTS/CTS) then we should not
390 * send the status report back.
391 */
392 if (!(skbdesc_flags & SKBDESC_NOT_MAC80211)) {
393 if (test_bit(REQUIRE_TASKLET_CONTEXT, &rt2x00dev->cap_flags))
394 ieee80211_tx_status(rt2x00dev->hw, entry->skb);
395 else
396 ieee80211_tx_status_ni(rt2x00dev->hw, entry->skb);
397 } else
398 dev_kfree_skb_any(entry->skb);
399
400 /*
401 * Make this entry available for reuse.
402 */
403 entry->skb = NULL;
404 entry->flags = 0;
405
406 rt2x00dev->ops->lib->clear_entry(entry);
407
408 rt2x00queue_index_inc(entry, Q_INDEX_DONE);
409
410 /*
411 * If the data queue was below the threshold before the txdone
412 * handler we must make sure the packet queue in the mac80211 stack
413 * is reenabled when the txdone handler has finished.
414 */
415 if (!rt2x00queue_threshold(entry->queue))
416 rt2x00queue_unpause_queue(entry->queue);
417}
418EXPORT_SYMBOL_GPL(rt2x00lib_txdone);
419
420void rt2x00lib_txdone_noinfo(struct queue_entry *entry, u32 status)
421{
422 struct txdone_entry_desc txdesc;
423
424 txdesc.flags = 0;
425 __set_bit(status, &txdesc.flags);
426 txdesc.retry = 0;
427
428 rt2x00lib_txdone(entry, &txdesc);
429}
430EXPORT_SYMBOL_GPL(rt2x00lib_txdone_noinfo);
431
432static u8 *rt2x00lib_find_ie(u8 *data, unsigned int len, u8 ie)
433{
434 struct ieee80211_mgmt *mgmt = (void *)data;
435 u8 *pos, *end;
436
437 pos = (u8 *)mgmt->u.beacon.variable;
438 end = data + len;
439 while (pos < end) {
440 if (pos + 2 + pos[1] > end)
441 return NULL;
442
443 if (pos[0] == ie)
444 return pos;
445
446 pos += 2 + pos[1];
447 }
448
449 return NULL;
450}
451
452static void rt2x00lib_rxdone_check_ps(struct rt2x00_dev *rt2x00dev,
453 struct sk_buff *skb,
454 struct rxdone_entry_desc *rxdesc)
455{
456 struct ieee80211_hdr *hdr = (void *) skb->data;
457 struct ieee80211_tim_ie *tim_ie;
458 u8 *tim;
459 u8 tim_len;
460 bool cam;
461
462 /* If this is not a beacon, or if mac80211 has no powersaving
463 * configured, or if the device is already in powersaving mode
464 * we can exit now. */
465 if (likely(!ieee80211_is_beacon(hdr->frame_control) ||
466 !(rt2x00dev->hw->conf.flags & IEEE80211_CONF_PS)))
467 return;
468
469 /* min. beacon length + FCS_LEN */
470 if (skb->len <= 40 + FCS_LEN)
471 return;
472
473 /* and only beacons from the associated BSSID, please */
474 if (!(rxdesc->dev_flags & RXDONE_MY_BSS) ||
475 !rt2x00dev->aid)
476 return;
477
478 rt2x00dev->last_beacon = jiffies;
479
480 tim = rt2x00lib_find_ie(skb->data, skb->len - FCS_LEN, WLAN_EID_TIM);
481 if (!tim)
482 return;
483
484 if (tim[1] < sizeof(*tim_ie))
485 return;
486
487 tim_len = tim[1];
488 tim_ie = (struct ieee80211_tim_ie *) &tim[2];
489
490 /* Check whenever the PHY can be turned off again. */
491
492 /* 1. What about buffered unicast traffic for our AID? */
493 cam = ieee80211_check_tim(tim_ie, tim_len, rt2x00dev->aid);
494
495 /* 2. Maybe the AP wants to send multicast/broadcast data? */
496 cam |= (tim_ie->bitmap_ctrl & 0x01);
497
498 if (!cam && !test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
499 rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf,
500 IEEE80211_CONF_CHANGE_PS);
501}
502
503static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
504 struct rxdone_entry_desc *rxdesc)
505{
506 struct ieee80211_supported_band *sband;
507 const struct rt2x00_rate *rate;
508 unsigned int i;
509 int signal = rxdesc->signal;
510 int type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);
511
512 switch (rxdesc->rate_mode) {
513 case RATE_MODE_CCK:
514 case RATE_MODE_OFDM:
515 /*
516 * For non-HT rates the MCS value needs to contain the
517 * actually used rate modulation (CCK or OFDM).
518 */
519 if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
520 signal = RATE_MCS(rxdesc->rate_mode, signal);
521
522 sband = &rt2x00dev->bands[rt2x00dev->curr_band];
523 for (i = 0; i < sband->n_bitrates; i++) {
524 rate = rt2x00_get_rate(sband->bitrates[i].hw_value);
525 if (((type == RXDONE_SIGNAL_PLCP) &&
526 (rate->plcp == signal)) ||
527 ((type == RXDONE_SIGNAL_BITRATE) &&
528 (rate->bitrate == signal)) ||
529 ((type == RXDONE_SIGNAL_MCS) &&
530 (rate->mcs == signal))) {
531 return i;
532 }
533 }
534 break;
535 case RATE_MODE_HT_MIX:
536 case RATE_MODE_HT_GREENFIELD:
537 if (signal >= 0 && signal <= 76)
538 return signal;
539 break;
540 default:
541 break;
542 }
543
544 WARNING(rt2x00dev, "Frame received with unrecognized signal, "
545 "mode=0x%.4x, signal=0x%.4x, type=%d.\n",
546 rxdesc->rate_mode, signal, type);
547 return 0;
548}
549
550void rt2x00lib_rxdone(struct queue_entry *entry)
551{
552 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
553 struct rxdone_entry_desc rxdesc;
554 struct sk_buff *skb;
555 struct ieee80211_rx_status *rx_status;
556 unsigned int header_length;
557 int rate_idx;
558
559 if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
560 !test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
561 goto submit_entry;
562
563 if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
564 goto submit_entry;
565
566 /*
567 * Allocate a new sk_buffer. If no new buffer available, drop the
568 * received frame and reuse the existing buffer.
569 */
570 skb = rt2x00queue_alloc_rxskb(entry);
571 if (!skb)
572 goto submit_entry;
573
574 /*
575 * Unmap the skb.
576 */
577 rt2x00queue_unmap_skb(entry);
578
579 /*
580 * Extract the RXD details.
581 */
582 memset(&rxdesc, 0, sizeof(rxdesc));
583 rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
584
585 /*
586 * Check for valid size in case we get corrupted descriptor from
587 * hardware.
588 */
589 if (unlikely(rxdesc.size == 0 ||
590 rxdesc.size > entry->queue->data_size)) {
591 WARNING(rt2x00dev, "Wrong frame size %d max %d.\n",
592 rxdesc.size, entry->queue->data_size);
593 dev_kfree_skb(entry->skb);
594 goto renew_skb;
595 }
596
597 /*
598 * The data behind the ieee80211 header must be
599 * aligned on a 4 byte boundary.
600 */
601 header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
602
603 /*
604 * Hardware might have stripped the IV/EIV/ICV data,
605 * in that case it is possible that the data was
606 * provided separately (through hardware descriptor)
607 * in which case we should reinsert the data into the frame.
608 */
609 if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
610 (rxdesc.flags & RX_FLAG_IV_STRIPPED))
611 rt2x00crypto_rx_insert_iv(entry->skb, header_length,
612 &rxdesc);
613 else if (header_length &&
614 (rxdesc.size > header_length) &&
615 (rxdesc.dev_flags & RXDONE_L2PAD))
616 rt2x00queue_remove_l2pad(entry->skb, header_length);
617
618 /* Trim buffer to correct size */
619 skb_trim(entry->skb, rxdesc.size);
620
621 /*
622 * Translate the signal to the correct bitrate index.
623 */
624 rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
625 if (rxdesc.rate_mode == RATE_MODE_HT_MIX ||
626 rxdesc.rate_mode == RATE_MODE_HT_GREENFIELD)
627 rxdesc.flags |= RX_FLAG_HT;
628
629 /*
630 * Check if this is a beacon, and more frames have been
631 * buffered while we were in powersaving mode.
632 */
633 rt2x00lib_rxdone_check_ps(rt2x00dev, entry->skb, &rxdesc);
634
635 /*
636 * Update extra components
637 */
638 rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
639 rt2x00debug_update_crypto(rt2x00dev, &rxdesc);
640 rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
641
642 /*
643 * Initialize RX status information, and send frame
644 * to mac80211.
645 */
646 rx_status = IEEE80211_SKB_RXCB(entry->skb);
647 rx_status->mactime = rxdesc.timestamp;
648 rx_status->band = rt2x00dev->curr_band;
649 rx_status->freq = rt2x00dev->curr_freq;
650 rx_status->rate_idx = rate_idx;
651 rx_status->signal = rxdesc.rssi;
652 rx_status->flag = rxdesc.flags;
653 rx_status->antenna = rt2x00dev->link.ant.active.rx;
654
655 ieee80211_rx_ni(rt2x00dev->hw, entry->skb);
656
657renew_skb:
658 /*
659 * Replace the skb with the freshly allocated one.
660 */
661 entry->skb = skb;
662
663submit_entry:
664 entry->flags = 0;
665 rt2x00queue_index_inc(entry, Q_INDEX_DONE);
666 if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
667 test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
668 rt2x00dev->ops->lib->clear_entry(entry);
669}
670EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);
671
672/*
673 * Driver initialization handlers.
674 */
675const struct rt2x00_rate rt2x00_supported_rates[12] = {
676 {
677 .flags = DEV_RATE_CCK,
678 .bitrate = 10,
679 .ratemask = BIT(0),
680 .plcp = 0x00,
681 .mcs = RATE_MCS(RATE_MODE_CCK, 0),
682 },
683 {
684 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
685 .bitrate = 20,
686 .ratemask = BIT(1),
687 .plcp = 0x01,
688 .mcs = RATE_MCS(RATE_MODE_CCK, 1),
689 },
690 {
691 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
692 .bitrate = 55,
693 .ratemask = BIT(2),
694 .plcp = 0x02,
695 .mcs = RATE_MCS(RATE_MODE_CCK, 2),
696 },
697 {
698 .flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
699 .bitrate = 110,
700 .ratemask = BIT(3),
701 .plcp = 0x03,
702 .mcs = RATE_MCS(RATE_MODE_CCK, 3),
703 },
704 {
705 .flags = DEV_RATE_OFDM,
706 .bitrate = 60,
707 .ratemask = BIT(4),
708 .plcp = 0x0b,
709 .mcs = RATE_MCS(RATE_MODE_OFDM, 0),
710 },
711 {
712 .flags = DEV_RATE_OFDM,
713 .bitrate = 90,
714 .ratemask = BIT(5),
715 .plcp = 0x0f,
716 .mcs = RATE_MCS(RATE_MODE_OFDM, 1),
717 },
718 {
719 .flags = DEV_RATE_OFDM,
720 .bitrate = 120,
721 .ratemask = BIT(6),
722 .plcp = 0x0a,
723 .mcs = RATE_MCS(RATE_MODE_OFDM, 2),
724 },
725 {
726 .flags = DEV_RATE_OFDM,
727 .bitrate = 180,
728 .ratemask = BIT(7),
729 .plcp = 0x0e,
730 .mcs = RATE_MCS(RATE_MODE_OFDM, 3),
731 },
732 {
733 .flags = DEV_RATE_OFDM,
734 .bitrate = 240,
735 .ratemask = BIT(8),
736 .plcp = 0x09,
737 .mcs = RATE_MCS(RATE_MODE_OFDM, 4),
738 },
739 {
740 .flags = DEV_RATE_OFDM,
741 .bitrate = 360,
742 .ratemask = BIT(9),
743 .plcp = 0x0d,
744 .mcs = RATE_MCS(RATE_MODE_OFDM, 5),
745 },
746 {
747 .flags = DEV_RATE_OFDM,
748 .bitrate = 480,
749 .ratemask = BIT(10),
750 .plcp = 0x08,
751 .mcs = RATE_MCS(RATE_MODE_OFDM, 6),
752 },
753 {
754 .flags = DEV_RATE_OFDM,
755 .bitrate = 540,
756 .ratemask = BIT(11),
757 .plcp = 0x0c,
758 .mcs = RATE_MCS(RATE_MODE_OFDM, 7),
759 },
760};
761
762static void rt2x00lib_channel(struct ieee80211_channel *entry,
763 const int channel, const int tx_power,
764 const int value)
765{
766 /* XXX: this assumption about the band is wrong for 802.11j */
767 entry->band = channel <= 14 ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
768 entry->center_freq = ieee80211_channel_to_frequency(channel,
769 entry->band);
770 entry->hw_value = value;
771 entry->max_power = tx_power;
772 entry->max_antenna_gain = 0xff;
773}
774
775static void rt2x00lib_rate(struct ieee80211_rate *entry,
776 const u16 index, const struct rt2x00_rate *rate)
777{
778 entry->flags = 0;
779 entry->bitrate = rate->bitrate;
780 entry->hw_value = index;
781 entry->hw_value_short = index;
782
783 if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
784 entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
785}
786
787static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
788 struct hw_mode_spec *spec)
789{
790 struct ieee80211_hw *hw = rt2x00dev->hw;
791 struct ieee80211_channel *channels;
792 struct ieee80211_rate *rates;
793 unsigned int num_rates;
794 unsigned int i;
795
796 num_rates = 0;
797 if (spec->supported_rates & SUPPORT_RATE_CCK)
798 num_rates += 4;
799 if (spec->supported_rates & SUPPORT_RATE_OFDM)
800 num_rates += 8;
801
802 channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
803 if (!channels)
804 return -ENOMEM;
805
806 rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
807 if (!rates)
808 goto exit_free_channels;
809
810 /*
811 * Initialize Rate list.
812 */
813 for (i = 0; i < num_rates; i++)
814 rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));
815
816 /*
817 * Initialize Channel list.
818 */
819 for (i = 0; i < spec->num_channels; i++) {
820 rt2x00lib_channel(&channels[i],
821 spec->channels[i].channel,
822 spec->channels_info[i].max_power, i);
823 }
824
825 /*
826 * Intitialize 802.11b, 802.11g
827 * Rates: CCK, OFDM.
828 * Channels: 2.4 GHz
829 */
830 if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
831 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
832 rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
833 rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
834 rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
835 hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
836 &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
837 memcpy(&rt2x00dev->bands[IEEE80211_BAND_2GHZ].ht_cap,
838 &spec->ht, sizeof(spec->ht));
839 }
840
841 /*
842 * Intitialize 802.11a
843 * Rates: OFDM.
844 * Channels: OFDM, UNII, HiperLAN2.
845 */
846 if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
847 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
848 spec->num_channels - 14;
849 rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
850 num_rates - 4;
851 rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
852 rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
853 hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
854 &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
855 memcpy(&rt2x00dev->bands[IEEE80211_BAND_5GHZ].ht_cap,
856 &spec->ht, sizeof(spec->ht));
857 }
858
859 return 0;
860
861 exit_free_channels:
862 kfree(channels);
863 ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
864 return -ENOMEM;
865}
866
867static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
868{
869 if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
870 ieee80211_unregister_hw(rt2x00dev->hw);
871
872 if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
873 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
874 kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
875 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
876 rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
877 }
878
879 kfree(rt2x00dev->spec.channels_info);
880}
881
882static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
883{
884 struct hw_mode_spec *spec = &rt2x00dev->spec;
885 int status;
886
887 if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
888 return 0;
889
890 /*
891 * Initialize HW modes.
892 */
893 status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
894 if (status)
895 return status;
896
897 /*
898 * Initialize HW fields.
899 */
900 rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;
901
902 /*
903 * Initialize extra TX headroom required.
904 */
905 rt2x00dev->hw->extra_tx_headroom =
906 max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM,
907 rt2x00dev->ops->extra_tx_headroom);
908
909 /*
910 * Take TX headroom required for alignment into account.
911 */
912 if (test_bit(REQUIRE_L2PAD, &rt2x00dev->cap_flags))
913 rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE;
914 else if (test_bit(REQUIRE_DMA, &rt2x00dev->cap_flags))
915 rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE;
916
917 /*
918 * Allocate tx status FIFO for driver use.
919 */
920 if (test_bit(REQUIRE_TXSTATUS_FIFO, &rt2x00dev->cap_flags)) {
921 /*
922 * Allocate the txstatus fifo. In the worst case the tx
923 * status fifo has to hold the tx status of all entries
924 * in all tx queues. Hence, calculate the kfifo size as
925 * tx_queues * entry_num and round up to the nearest
926 * power of 2.
927 */
928 int kfifo_size =
929 roundup_pow_of_two(rt2x00dev->ops->tx_queues *
930 rt2x00dev->ops->tx->entry_num *
931 sizeof(u32));
932
933 status = kfifo_alloc(&rt2x00dev->txstatus_fifo, kfifo_size,
934 GFP_KERNEL);
935 if (status)
936 return status;
937 }
938
939 /*
940 * Initialize tasklets if used by the driver. Tasklets are
941 * disabled until the interrupts are turned on. The driver
942 * has to handle that.
943 */
944#define RT2X00_TASKLET_INIT(taskletname) \
945 if (rt2x00dev->ops->lib->taskletname) { \
946 tasklet_init(&rt2x00dev->taskletname, \
947 rt2x00dev->ops->lib->taskletname, \
948 (unsigned long)rt2x00dev); \
949 tasklet_disable(&rt2x00dev->taskletname); \
950 }
951
952 RT2X00_TASKLET_INIT(txstatus_tasklet);
953 RT2X00_TASKLET_INIT(pretbtt_tasklet);
954 RT2X00_TASKLET_INIT(tbtt_tasklet);
955 RT2X00_TASKLET_INIT(rxdone_tasklet);
956 RT2X00_TASKLET_INIT(autowake_tasklet);
957
958#undef RT2X00_TASKLET_INIT
959
960 /*
961 * Register HW.
962 */
963 status = ieee80211_register_hw(rt2x00dev->hw);
964 if (status)
965 return status;
966
967 set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);
968
969 return 0;
970}
971
972/*
973 * Initialization/uninitialization handlers.
974 */
975static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
976{
977 if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
978 return;
979
980 /*
981 * Unregister extra components.
982 */
983 rt2x00rfkill_unregister(rt2x00dev);
984
985 /*
986 * Allow the HW to uninitialize.
987 */
988 rt2x00dev->ops->lib->uninitialize(rt2x00dev);
989
990 /*
991 * Free allocated queue entries.
992 */
993 rt2x00queue_uninitialize(rt2x00dev);
994}
995
996static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
997{
998 int status;
999
1000 if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
1001 return 0;
1002
1003 /*
1004 * Allocate all queue entries.
1005 */
1006 status = rt2x00queue_initialize(rt2x00dev);
1007 if (status)
1008 return status;
1009
1010 /*
1011 * Initialize the device.
1012 */
1013 status = rt2x00dev->ops->lib->initialize(rt2x00dev);
1014 if (status) {
1015 rt2x00queue_uninitialize(rt2x00dev);
1016 return status;
1017 }
1018
1019 set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);
1020
1021 /*
1022 * Register the extra components.
1023 */
1024 rt2x00rfkill_register(rt2x00dev);
1025
1026 return 0;
1027}
1028
1029int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
1030{
1031 int retval;
1032
1033 if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1034 return 0;
1035
1036 /*
1037 * If this is the first interface which is added,
1038 * we should load the firmware now.
1039 */
1040 retval = rt2x00lib_load_firmware(rt2x00dev);
1041 if (retval)
1042 return retval;
1043
1044 /*
1045 * Initialize the device.
1046 */
1047 retval = rt2x00lib_initialize(rt2x00dev);
1048 if (retval)
1049 return retval;
1050
1051 rt2x00dev->intf_ap_count = 0;
1052 rt2x00dev->intf_sta_count = 0;
1053 rt2x00dev->intf_associated = 0;
1054
1055 /* Enable the radio */
1056 retval = rt2x00lib_enable_radio(rt2x00dev);
1057 if (retval)
1058 return retval;
1059
1060 set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);
1061
1062 return 0;
1063}
1064
1065void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
1066{
1067 if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
1068 return;
1069
1070 /*
1071 * Perhaps we can add something smarter here,
1072 * but for now just disabling the radio should do.
1073 */
1074 rt2x00lib_disable_radio(rt2x00dev);
1075
1076 rt2x00dev->intf_ap_count = 0;
1077 rt2x00dev->intf_sta_count = 0;
1078 rt2x00dev->intf_associated = 0;
1079}
1080
1081/*
1082 * driver allocation handlers.
1083 */
1084int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
1085{
1086 int retval = -ENOMEM;
1087
1088 spin_lock_init(&rt2x00dev->irqmask_lock);
1089 mutex_init(&rt2x00dev->csr_mutex);
1090
1091 set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1092
1093 /*
1094 * Make room for rt2x00_intf inside the per-interface
1095 * structure ieee80211_vif.
1096 */
1097 rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);
1098
1099 /*
1100 * Determine which operating modes are supported, all modes
1101 * which require beaconing, depend on the availability of
1102 * beacon entries.
1103 */
1104 rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
1105 if (rt2x00dev->ops->bcn->entry_num > 0)
1106 rt2x00dev->hw->wiphy->interface_modes |=
1107 BIT(NL80211_IFTYPE_ADHOC) |
1108 BIT(NL80211_IFTYPE_AP) |
1109 BIT(NL80211_IFTYPE_MESH_POINT) |
1110 BIT(NL80211_IFTYPE_WDS);
1111
1112 /*
1113 * Initialize work.
1114 */
1115 rt2x00dev->workqueue =
1116 alloc_ordered_workqueue(wiphy_name(rt2x00dev->hw->wiphy), 0);
1117 if (!rt2x00dev->workqueue) {
1118 retval = -ENOMEM;
1119 goto exit;
1120 }
1121
1122 INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
1123 INIT_DELAYED_WORK(&rt2x00dev->autowakeup_work, rt2x00lib_autowakeup);
1124
1125 /*
1126 * Let the driver probe the device to detect the capabilities.
1127 */
1128 retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
1129 if (retval) {
1130 ERROR(rt2x00dev, "Failed to allocate device.\n");
1131 goto exit;
1132 }
1133
1134 /*
1135 * Allocate queue array.
1136 */
1137 retval = rt2x00queue_allocate(rt2x00dev);
1138 if (retval)
1139 goto exit;
1140
1141 /*
1142 * Initialize ieee80211 structure.
1143 */
1144 retval = rt2x00lib_probe_hw(rt2x00dev);
1145 if (retval) {
1146 ERROR(rt2x00dev, "Failed to initialize hw.\n");
1147 goto exit;
1148 }
1149
1150 /*
1151 * Register extra components.
1152 */
1153 rt2x00link_register(rt2x00dev);
1154 rt2x00leds_register(rt2x00dev);
1155 rt2x00debug_register(rt2x00dev);
1156
1157 return 0;
1158
1159exit:
1160 rt2x00lib_remove_dev(rt2x00dev);
1161
1162 return retval;
1163}
1164EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);
1165
1166void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
1167{
1168 clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1169
1170 /*
1171 * Disable radio.
1172 */
1173 rt2x00lib_disable_radio(rt2x00dev);
1174
1175 /*
1176 * Stop all work.
1177 */
1178 cancel_work_sync(&rt2x00dev->intf_work);
1179 cancel_delayed_work_sync(&rt2x00dev->autowakeup_work);
1180 if (rt2x00_is_usb(rt2x00dev)) {
1181 del_timer_sync(&rt2x00dev->txstatus_timer);
1182 cancel_work_sync(&rt2x00dev->rxdone_work);
1183 cancel_work_sync(&rt2x00dev->txdone_work);
1184 }
1185 destroy_workqueue(rt2x00dev->workqueue);
1186
1187 /*
1188 * Free the tx status fifo.
1189 */
1190 kfifo_free(&rt2x00dev->txstatus_fifo);
1191
1192 /*
1193 * Kill the tx status tasklet.
1194 */
1195 tasklet_kill(&rt2x00dev->txstatus_tasklet);
1196 tasklet_kill(&rt2x00dev->pretbtt_tasklet);
1197 tasklet_kill(&rt2x00dev->tbtt_tasklet);
1198 tasklet_kill(&rt2x00dev->rxdone_tasklet);
1199 tasklet_kill(&rt2x00dev->autowake_tasklet);
1200
1201 /*
1202 * Uninitialize device.
1203 */
1204 rt2x00lib_uninitialize(rt2x00dev);
1205
1206 /*
1207 * Free extra components
1208 */
1209 rt2x00debug_deregister(rt2x00dev);
1210 rt2x00leds_unregister(rt2x00dev);
1211
1212 /*
1213 * Free ieee80211_hw memory.
1214 */
1215 rt2x00lib_remove_hw(rt2x00dev);
1216
1217 /*
1218 * Free firmware image.
1219 */
1220 rt2x00lib_free_firmware(rt2x00dev);
1221
1222 /*
1223 * Free queue structures.
1224 */
1225 rt2x00queue_free(rt2x00dev);
1226}
1227EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);
1228
1229/*
1230 * Device state handlers
1231 */
1232#ifdef CONFIG_PM
1233int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
1234{
1235 NOTICE(rt2x00dev, "Going to sleep.\n");
1236
1237 /*
1238 * Prevent mac80211 from accessing driver while suspended.
1239 */
1240 if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
1241 return 0;
1242
1243 /*
1244 * Cleanup as much as possible.
1245 */
1246 rt2x00lib_uninitialize(rt2x00dev);
1247
1248 /*
1249 * Suspend/disable extra components.
1250 */
1251 rt2x00leds_suspend(rt2x00dev);
1252 rt2x00debug_deregister(rt2x00dev);
1253
1254 /*
1255 * Set device mode to sleep for power management,
1256 * on some hardware this call seems to consistently fail.
1257 * From the specifications it is hard to tell why it fails,
1258 * and if this is a "bad thing".
1259 * Overall it is safe to just ignore the failure and
1260 * continue suspending. The only downside is that the
1261 * device will not be in optimal power save mode, but with
1262 * the radio and the other components already disabled the
1263 * device is as good as disabled.
1264 */
1265 if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
1266 WARNING(rt2x00dev, "Device failed to enter sleep state, "
1267 "continue suspending.\n");
1268
1269 return 0;
1270}
1271EXPORT_SYMBOL_GPL(rt2x00lib_suspend);
1272
1273int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
1274{
1275 NOTICE(rt2x00dev, "Waking up.\n");
1276
1277 /*
1278 * Restore/enable extra components.
1279 */
1280 rt2x00debug_register(rt2x00dev);
1281 rt2x00leds_resume(rt2x00dev);
1282
1283 /*
1284 * We are ready again to receive requests from mac80211.
1285 */
1286 set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
1287
1288 return 0;
1289}
1290EXPORT_SYMBOL_GPL(rt2x00lib_resume);
1291#endif /* CONFIG_PM */
1292
1293/*
1294 * rt2x00lib module information.
1295 */
1296MODULE_AUTHOR(DRV_PROJECT);
1297MODULE_VERSION(DRV_VERSION);
1298MODULE_DESCRIPTION("rt2x00 library");
1299MODULE_LICENSE("GPL");