1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* ZD1211 USB-WLAN driver for Linux
3 *
4 * Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de>
5 * Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org>
6 * Copyright (C) 2006-2007 Michael Wu <flamingice@sourmilk.net>
7 * Copyright (C) 2007-2008 Luis R. Rodriguez <mcgrof@winlab.rutgers.edu>
8 */
9
10 #include <linux/netdevice.h>
11 #include <linux/etherdevice.h>
12 #include <linux/slab.h>
13 #include <linux/usb.h>
14 #include <linux/jiffies.h>
15 #include <net/ieee80211_radiotap.h>
16
17 #include "zd_def.h"
18 #include "zd_chip.h"
19 #include "zd_mac.h"
20 #include "zd_rf.h"
21
22 struct zd_reg_alpha2_map {
23 u32 reg;
24 char alpha2[2] __nonstring;
25 };
26
27 static struct zd_reg_alpha2_map reg_alpha2_map[] = {
28 { ZD_REGDOMAIN_FCC, "US" },
29 { ZD_REGDOMAIN_IC, "CA" },
30 { ZD_REGDOMAIN_ETSI, "DE" }, /* Generic ETSI, use most restrictive */
31 { ZD_REGDOMAIN_JAPAN, "JP" },
32 { ZD_REGDOMAIN_JAPAN_2, "JP" },
33 { ZD_REGDOMAIN_JAPAN_3, "JP" },
34 { ZD_REGDOMAIN_SPAIN, "ES" },
35 { ZD_REGDOMAIN_FRANCE, "FR" },
36 };
37
38 /* This table contains the hardware specific values for the modulation rates. */
39 static const struct ieee80211_rate zd_rates[] = {
40 { .bitrate = 10,
41 .hw_value = ZD_CCK_RATE_1M, },
42 { .bitrate = 20,
43 .hw_value = ZD_CCK_RATE_2M,
44 .hw_value_short = ZD_CCK_RATE_2M | ZD_CCK_PREA_SHORT,
45 .flags = IEEE80211_RATE_SHORT_PREAMBLE },
46 { .bitrate = 55,
47 .hw_value = ZD_CCK_RATE_5_5M,
48 .hw_value_short = ZD_CCK_RATE_5_5M | ZD_CCK_PREA_SHORT,
49 .flags = IEEE80211_RATE_SHORT_PREAMBLE },
50 { .bitrate = 110,
51 .hw_value = ZD_CCK_RATE_11M,
52 .hw_value_short = ZD_CCK_RATE_11M | ZD_CCK_PREA_SHORT,
53 .flags = IEEE80211_RATE_SHORT_PREAMBLE },
54 { .bitrate = 60,
55 .hw_value = ZD_OFDM_RATE_6M,
56 .flags = 0 },
57 { .bitrate = 90,
58 .hw_value = ZD_OFDM_RATE_9M,
59 .flags = 0 },
60 { .bitrate = 120,
61 .hw_value = ZD_OFDM_RATE_12M,
62 .flags = 0 },
63 { .bitrate = 180,
64 .hw_value = ZD_OFDM_RATE_18M,
65 .flags = 0 },
66 { .bitrate = 240,
67 .hw_value = ZD_OFDM_RATE_24M,
68 .flags = 0 },
69 { .bitrate = 360,
70 .hw_value = ZD_OFDM_RATE_36M,
71 .flags = 0 },
72 { .bitrate = 480,
73 .hw_value = ZD_OFDM_RATE_48M,
74 .flags = 0 },
75 { .bitrate = 540,
76 .hw_value = ZD_OFDM_RATE_54M,
77 .flags = 0 },
78 };
79
80 /*
81 * Zydas retry rates table. Each line is listed in the same order as
82 * in zd_rates[] and contains all the rate used when a packet is sent
83 * starting with a given rates. Let's consider an example :
84 *
85 * "11 Mbits : 4, 3, 2, 1, 0" means :
86 * - packet is sent using 4 different rates
87 * - 1st rate is index 3 (ie 11 Mbits)
88 * - 2nd rate is index 2 (ie 5.5 Mbits)
89 * - 3rd rate is index 1 (ie 2 Mbits)
90 * - 4th rate is index 0 (ie 1 Mbits)
91 */
92
93 static const struct tx_retry_rate zd_retry_rates[] = {
94 { /* 1 Mbits */ 1, { 0 }},
95 { /* 2 Mbits */ 2, { 1, 0 }},
96 { /* 5.5 Mbits */ 3, { 2, 1, 0 }},
97 { /* 11 Mbits */ 4, { 3, 2, 1, 0 }},
98 { /* 6 Mbits */ 5, { 4, 3, 2, 1, 0 }},
99 { /* 9 Mbits */ 6, { 5, 4, 3, 2, 1, 0}},
100 { /* 12 Mbits */ 5, { 6, 3, 2, 1, 0 }},
101 { /* 18 Mbits */ 6, { 7, 6, 3, 2, 1, 0 }},
102 { /* 24 Mbits */ 6, { 8, 6, 3, 2, 1, 0 }},
103 { /* 36 Mbits */ 7, { 9, 8, 6, 3, 2, 1, 0 }},
104 { /* 48 Mbits */ 8, {10, 9, 8, 6, 3, 2, 1, 0 }},
105 { /* 54 Mbits */ 9, {11, 10, 9, 8, 6, 3, 2, 1, 0 }}
106 };
107
108 static const struct ieee80211_channel zd_channels[] = {
109 { .center_freq = 2412, .hw_value = 1 },
110 { .center_freq = 2417, .hw_value = 2 },
111 { .center_freq = 2422, .hw_value = 3 },
112 { .center_freq = 2427, .hw_value = 4 },
113 { .center_freq = 2432, .hw_value = 5 },
114 { .center_freq = 2437, .hw_value = 6 },
115 { .center_freq = 2442, .hw_value = 7 },
116 { .center_freq = 2447, .hw_value = 8 },
117 { .center_freq = 2452, .hw_value = 9 },
118 { .center_freq = 2457, .hw_value = 10 },
119 { .center_freq = 2462, .hw_value = 11 },
120 { .center_freq = 2467, .hw_value = 12 },
121 { .center_freq = 2472, .hw_value = 13 },
122 { .center_freq = 2484, .hw_value = 14 },
123 };
124
125 static void housekeeping_init(struct zd_mac *mac);
126 static void housekeeping_enable(struct zd_mac *mac);
127 static void housekeeping_disable(struct zd_mac *mac);
128 static void beacon_init(struct zd_mac *mac);
129 static void beacon_enable(struct zd_mac *mac);
130 static void beacon_disable(struct zd_mac *mac);
131 static void set_rts_cts(struct zd_mac *mac, unsigned int short_preamble);
132 static int zd_mac_config_beacon(struct ieee80211_hw *hw,
133 struct sk_buff *beacon, bool in_intr);
134
zd_reg2alpha2(u8 regdomain,char * alpha2)135 static int zd_reg2alpha2(u8 regdomain, char *alpha2)
136 {
137 unsigned int i;
138 struct zd_reg_alpha2_map *reg_map;
139 for (i = 0; i < ARRAY_SIZE(reg_alpha2_map); i++) {
140 reg_map = ®_alpha2_map[i];
141 if (regdomain == reg_map->reg) {
142 alpha2[0] = reg_map->alpha2[0];
143 alpha2[1] = reg_map->alpha2[1];
144 return 0;
145 }
146 }
147 return 1;
148 }
149
zd_check_signal(struct ieee80211_hw * hw,int signal)150 static int zd_check_signal(struct ieee80211_hw *hw, int signal)
151 {
152 struct zd_mac *mac = zd_hw_mac(hw);
153
154 dev_dbg_f_cond(zd_mac_dev(mac), signal < 0 || signal > 100,
155 "%s: signal value from device not in range 0..100, "
156 "but %d.\n", __func__, signal);
157
158 if (signal < 0)
159 signal = 0;
160 else if (signal > 100)
161 signal = 100;
162
163 return signal;
164 }
165
zd_mac_preinit_hw(struct ieee80211_hw * hw)166 int zd_mac_preinit_hw(struct ieee80211_hw *hw)
167 {
168 int r;
169 u8 addr[ETH_ALEN];
170 struct zd_mac *mac = zd_hw_mac(hw);
171
172 r = zd_chip_read_mac_addr_fw(&mac->chip, addr);
173 if (r)
174 return r;
175
176 SET_IEEE80211_PERM_ADDR(hw, addr);
177
178 return 0;
179 }
180
zd_mac_init_hw(struct ieee80211_hw * hw)181 int zd_mac_init_hw(struct ieee80211_hw *hw)
182 {
183 int r;
184 struct zd_mac *mac = zd_hw_mac(hw);
185 struct zd_chip *chip = &mac->chip;
186 char alpha2[2];
187 u8 default_regdomain;
188
189 r = zd_chip_enable_int(chip);
190 if (r)
191 goto out;
192 r = zd_chip_init_hw(chip);
193 if (r)
194 goto disable_int;
195
196 ZD_ASSERT(!irqs_disabled());
197
198 r = zd_read_regdomain(chip, &default_regdomain);
199 if (r)
200 goto disable_int;
201 spin_lock_irq(&mac->lock);
202 mac->regdomain = mac->default_regdomain = default_regdomain;
203 spin_unlock_irq(&mac->lock);
204
205 /* We must inform the device that we are doing encryption/decryption in
206 * software at the moment. */
207 r = zd_set_encryption_type(chip, ENC_SNIFFER);
208 if (r)
209 goto disable_int;
210
211 r = zd_reg2alpha2(mac->regdomain, alpha2);
212 if (r)
213 goto disable_int;
214
215 r = regulatory_hint(hw->wiphy, alpha2);
216 disable_int:
217 zd_chip_disable_int(chip);
218 out:
219 return r;
220 }
221
zd_mac_clear(struct zd_mac * mac)222 void zd_mac_clear(struct zd_mac *mac)
223 {
224 flush_workqueue(zd_workqueue);
225 zd_chip_clear(&mac->chip);
226 ZD_MEMCLEAR(mac, sizeof(struct zd_mac));
227 }
228
set_rx_filter(struct zd_mac * mac)229 static int set_rx_filter(struct zd_mac *mac)
230 {
231 unsigned long flags;
232 u32 filter = STA_RX_FILTER;
233
234 spin_lock_irqsave(&mac->lock, flags);
235 if (mac->pass_ctrl)
236 filter |= RX_FILTER_CTRL;
237 spin_unlock_irqrestore(&mac->lock, flags);
238
239 return zd_iowrite32(&mac->chip, CR_RX_FILTER, filter);
240 }
241
set_mac_and_bssid(struct zd_mac * mac)242 static int set_mac_and_bssid(struct zd_mac *mac)
243 {
244 int r;
245
246 if (!mac->vif)
247 return -1;
248
249 r = zd_write_mac_addr(&mac->chip, mac->vif->addr);
250 if (r)
251 return r;
252
253 /* Vendor driver after setting MAC either sets BSSID for AP or
254 * filter for other modes.
255 */
256 if (mac->type != NL80211_IFTYPE_AP)
257 return set_rx_filter(mac);
258 else
259 return zd_write_bssid(&mac->chip, mac->vif->addr);
260 }
261
set_mc_hash(struct zd_mac * mac)262 static int set_mc_hash(struct zd_mac *mac)
263 {
264 struct zd_mc_hash hash;
265 zd_mc_clear(&hash);
266 return zd_chip_set_multicast_hash(&mac->chip, &hash);
267 }
268
zd_op_start(struct ieee80211_hw * hw)269 int zd_op_start(struct ieee80211_hw *hw)
270 {
271 struct zd_mac *mac = zd_hw_mac(hw);
272 struct zd_chip *chip = &mac->chip;
273 struct zd_usb *usb = &chip->usb;
274 int r;
275
276 if (!usb->initialized) {
277 r = zd_usb_init_hw(usb);
278 if (r)
279 goto out;
280 }
281
282 r = zd_chip_enable_int(chip);
283 if (r < 0)
284 goto out;
285
286 r = zd_chip_set_basic_rates(chip, CR_RATES_80211B | CR_RATES_80211G);
287 if (r < 0)
288 goto disable_int;
289 r = set_rx_filter(mac);
290 if (r)
291 goto disable_int;
292 r = set_mc_hash(mac);
293 if (r)
294 goto disable_int;
295
296 /* Wait after setting the multicast hash table and powering on
297 * the radio otherwise interface bring up will fail. This matches
298 * what the vendor driver did.
299 */
300 msleep(10);
301
302 r = zd_chip_switch_radio_on(chip);
303 if (r < 0) {
304 dev_err(zd_chip_dev(chip),
305 "%s: failed to set radio on\n", __func__);
306 goto disable_int;
307 }
308 r = zd_chip_enable_rxtx(chip);
309 if (r < 0)
310 goto disable_radio;
311 r = zd_chip_enable_hwint(chip);
312 if (r < 0)
313 goto disable_rxtx;
314
315 housekeeping_enable(mac);
316 beacon_enable(mac);
317 set_bit(ZD_DEVICE_RUNNING, &mac->flags);
318 return 0;
319 disable_rxtx:
320 zd_chip_disable_rxtx(chip);
321 disable_radio:
322 zd_chip_switch_radio_off(chip);
323 disable_int:
324 zd_chip_disable_int(chip);
325 out:
326 return r;
327 }
328
zd_op_stop(struct ieee80211_hw * hw,bool suspend)329 void zd_op_stop(struct ieee80211_hw *hw, bool suspend)
330 {
331 struct zd_mac *mac = zd_hw_mac(hw);
332 struct zd_chip *chip = &mac->chip;
333 struct sk_buff *skb;
334 struct sk_buff_head *ack_wait_queue = &mac->ack_wait_queue;
335
336 clear_bit(ZD_DEVICE_RUNNING, &mac->flags);
337
338 /* The order here deliberately is a little different from the open()
339 * method, since we need to make sure there is no opportunity for RX
340 * frames to be processed by mac80211 after we have stopped it.
341 */
342
343 zd_chip_disable_rxtx(chip);
344 beacon_disable(mac);
345 housekeeping_disable(mac);
346 flush_workqueue(zd_workqueue);
347
348 zd_chip_disable_hwint(chip);
349 zd_chip_switch_radio_off(chip);
350 zd_chip_disable_int(chip);
351
352
353 while ((skb = skb_dequeue(ack_wait_queue)))
354 dev_kfree_skb_any(skb);
355 }
356
zd_restore_settings(struct zd_mac * mac)357 int zd_restore_settings(struct zd_mac *mac)
358 {
359 struct sk_buff *beacon;
360 struct zd_mc_hash multicast_hash;
361 unsigned int short_preamble;
362 int r, beacon_interval, beacon_period;
363 u8 channel;
364
365 dev_dbg_f(zd_mac_dev(mac), "\n");
366
367 spin_lock_irq(&mac->lock);
368 multicast_hash = mac->multicast_hash;
369 short_preamble = mac->short_preamble;
370 beacon_interval = mac->beacon.interval;
371 beacon_period = mac->beacon.period;
372 channel = mac->channel;
373 spin_unlock_irq(&mac->lock);
374
375 r = set_mac_and_bssid(mac);
376 if (r < 0) {
377 dev_dbg_f(zd_mac_dev(mac), "set_mac_and_bssid failed, %d\n", r);
378 return r;
379 }
380
381 r = zd_chip_set_channel(&mac->chip, channel);
382 if (r < 0) {
383 dev_dbg_f(zd_mac_dev(mac), "zd_chip_set_channel failed, %d\n",
384 r);
385 return r;
386 }
387
388 set_rts_cts(mac, short_preamble);
389
390 r = zd_chip_set_multicast_hash(&mac->chip, &multicast_hash);
391 if (r < 0) {
392 dev_dbg_f(zd_mac_dev(mac),
393 "zd_chip_set_multicast_hash failed, %d\n", r);
394 return r;
395 }
396
397 if (mac->type == NL80211_IFTYPE_MESH_POINT ||
398 mac->type == NL80211_IFTYPE_ADHOC ||
399 mac->type == NL80211_IFTYPE_AP) {
400 if (mac->vif != NULL) {
401 beacon = ieee80211_beacon_get(mac->hw, mac->vif, 0);
402 if (beacon)
403 zd_mac_config_beacon(mac->hw, beacon, false);
404 }
405
406 zd_set_beacon_interval(&mac->chip, beacon_interval,
407 beacon_period, mac->type);
408
409 spin_lock_irq(&mac->lock);
410 mac->beacon.last_update = jiffies;
411 spin_unlock_irq(&mac->lock);
412 }
413
414 return 0;
415 }
416
417 /**
418 * zd_mac_tx_status - reports tx status of a packet if required
419 * @hw: a &struct ieee80211_hw pointer
420 * @skb: a sk-buffer
421 * @ackssi: ACK signal strength
422 * @tx_status: success and/or retry
423 *
424 * This information calls ieee80211_tx_status_irqsafe() if required by the
425 * control information. It copies the control information into the status
426 * information.
427 *
428 * If no status information has been requested, the skb is freed.
429 */
zd_mac_tx_status(struct ieee80211_hw * hw,struct sk_buff * skb,int ackssi,struct tx_status * tx_status)430 static void zd_mac_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
431 int ackssi, struct tx_status *tx_status)
432 {
433 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
434 int i;
435 int success = 1, retry = 1;
436 int first_idx;
437 const struct tx_retry_rate *retries;
438
439 ieee80211_tx_info_clear_status(info);
440
441 if (tx_status) {
442 success = !tx_status->failure;
443 retry = tx_status->retry + success;
444 }
445
446 if (success) {
447 /* success */
448 info->flags |= IEEE80211_TX_STAT_ACK;
449 } else {
450 /* failure */
451 info->flags &= ~IEEE80211_TX_STAT_ACK;
452 }
453
454 first_idx = info->status.rates[0].idx;
455 ZD_ASSERT(0<=first_idx && first_idx<ARRAY_SIZE(zd_retry_rates));
456 retries = &zd_retry_rates[first_idx];
457 ZD_ASSERT(1 <= retry && retry <= retries->count);
458
459 info->status.rates[0].idx = retries->rate[0];
460 info->status.rates[0].count = 1; // (retry > 1 ? 2 : 1);
461
462 for (i=1; i<IEEE80211_TX_MAX_RATES-1 && i<retry; i++) {
463 info->status.rates[i].idx = retries->rate[i];
464 info->status.rates[i].count = 1; // ((i==retry-1) && success ? 1:2);
465 }
466 for (; i<IEEE80211_TX_MAX_RATES && i<retry; i++) {
467 info->status.rates[i].idx = retries->rate[retry - 1];
468 info->status.rates[i].count = 1; // (success ? 1:2);
469 }
470 if (i<IEEE80211_TX_MAX_RATES)
471 info->status.rates[i].idx = -1; /* terminate */
472
473 info->status.ack_signal = zd_check_signal(hw, ackssi);
474 ieee80211_tx_status_irqsafe(hw, skb);
475 }
476
477 /**
478 * zd_mac_tx_failed - callback for failed frames
479 * @urb: pointer to the urb structure
480 *
481 * This function is called if a frame couldn't be successfully
482 * transferred. The first frame from the tx queue, will be selected and
483 * reported as error to the upper layers.
484 */
zd_mac_tx_failed(struct urb * urb)485 void zd_mac_tx_failed(struct urb *urb)
486 {
487 struct ieee80211_hw * hw = zd_usb_to_hw(urb->context);
488 struct zd_mac *mac = zd_hw_mac(hw);
489 struct sk_buff_head *q = &mac->ack_wait_queue;
490 struct sk_buff *skb;
491 struct tx_status *tx_status = (struct tx_status *)urb->transfer_buffer;
492 unsigned long flags;
493 int success = !tx_status->failure;
494 int retry = tx_status->retry + success;
495 int found = 0;
496 int i, position = 0;
497
498 spin_lock_irqsave(&q->lock, flags);
499
500 skb_queue_walk(q, skb) {
501 struct ieee80211_hdr *tx_hdr;
502 struct ieee80211_tx_info *info;
503 int first_idx, final_idx;
504 const struct tx_retry_rate *retries;
505 u8 final_rate;
506
507 position ++;
508
509 /* if the hardware reports a failure and we had a 802.11 ACK
510 * pending, then we skip the first skb when searching for a
511 * matching frame */
512 if (tx_status->failure && mac->ack_pending &&
513 skb_queue_is_first(q, skb)) {
514 continue;
515 }
516
517 tx_hdr = (struct ieee80211_hdr *)skb->data;
518
519 /* we skip all frames not matching the reported destination */
520 if (unlikely(!ether_addr_equal(tx_hdr->addr1, tx_status->mac)))
521 continue;
522
523 /* we skip all frames not matching the reported final rate */
524
525 info = IEEE80211_SKB_CB(skb);
526 first_idx = info->status.rates[0].idx;
527 ZD_ASSERT(0<=first_idx && first_idx<ARRAY_SIZE(zd_retry_rates));
528 retries = &zd_retry_rates[first_idx];
529 if (retry <= 0 || retry > retries->count)
530 continue;
531
532 final_idx = retries->rate[retry - 1];
533 final_rate = zd_rates[final_idx].hw_value;
534
535 if (final_rate != tx_status->rate) {
536 continue;
537 }
538
539 found = 1;
540 break;
541 }
542
543 if (found) {
544 for (i=1; i<=position; i++) {
545 skb = __skb_dequeue(q);
546 zd_mac_tx_status(hw, skb,
547 mac->ack_pending ? mac->ack_signal : 0,
548 i == position ? tx_status : NULL);
549 mac->ack_pending = 0;
550 }
551 }
552
553 spin_unlock_irqrestore(&q->lock, flags);
554 }
555
556 /**
557 * zd_mac_tx_to_dev - callback for USB layer
558 * @skb: a &sk_buff pointer
559 * @error: error value, 0 if transmission successful
560 *
561 * Informs the MAC layer that the frame has successfully transferred to the
562 * device. If an ACK is required and the transfer to the device has been
563 * successful, the packets are put on the @ack_wait_queue with
564 * the control set removed.
565 */
zd_mac_tx_to_dev(struct sk_buff * skb,int error)566 void zd_mac_tx_to_dev(struct sk_buff *skb, int error)
567 {
568 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
569 struct ieee80211_hw *hw = info->rate_driver_data[0];
570 struct zd_mac *mac = zd_hw_mac(hw);
571
572 ieee80211_tx_info_clear_status(info);
573
574 skb_pull(skb, sizeof(struct zd_ctrlset));
575 if (unlikely(error ||
576 (info->flags & IEEE80211_TX_CTL_NO_ACK))) {
577 /*
578 * FIXME : do we need to fill in anything ?
579 */
580 ieee80211_tx_status_irqsafe(hw, skb);
581 } else {
582 struct sk_buff_head *q = &mac->ack_wait_queue;
583
584 skb_queue_tail(q, skb);
585 while (skb_queue_len(q) > ZD_MAC_MAX_ACK_WAITERS) {
586 skb = skb_dequeue(q);
587 if (!skb)
588 break;
589
590 zd_mac_tx_status(hw, skb,
591 mac->ack_pending ? mac->ack_signal : 0,
592 NULL);
593 mac->ack_pending = 0;
594 }
595 }
596 }
597
zd_calc_tx_length_us(u8 * service,u8 zd_rate,u16 tx_length)598 static int zd_calc_tx_length_us(u8 *service, u8 zd_rate, u16 tx_length)
599 {
600 /* ZD_PURE_RATE() must be used to remove the modulation type flag of
601 * the zd-rate values.
602 */
603 static const u8 rate_divisor[] = {
604 [ZD_PURE_RATE(ZD_CCK_RATE_1M)] = 1,
605 [ZD_PURE_RATE(ZD_CCK_RATE_2M)] = 2,
606 /* Bits must be doubled. */
607 [ZD_PURE_RATE(ZD_CCK_RATE_5_5M)] = 11,
608 [ZD_PURE_RATE(ZD_CCK_RATE_11M)] = 11,
609 [ZD_PURE_RATE(ZD_OFDM_RATE_6M)] = 6,
610 [ZD_PURE_RATE(ZD_OFDM_RATE_9M)] = 9,
611 [ZD_PURE_RATE(ZD_OFDM_RATE_12M)] = 12,
612 [ZD_PURE_RATE(ZD_OFDM_RATE_18M)] = 18,
613 [ZD_PURE_RATE(ZD_OFDM_RATE_24M)] = 24,
614 [ZD_PURE_RATE(ZD_OFDM_RATE_36M)] = 36,
615 [ZD_PURE_RATE(ZD_OFDM_RATE_48M)] = 48,
616 [ZD_PURE_RATE(ZD_OFDM_RATE_54M)] = 54,
617 };
618
619 u32 bits = (u32)tx_length * 8;
620 u32 divisor;
621
622 divisor = rate_divisor[ZD_PURE_RATE(zd_rate)];
623 if (divisor == 0)
624 return -EINVAL;
625
626 switch (zd_rate) {
627 case ZD_CCK_RATE_5_5M:
628 bits = (2*bits) + 10; /* round up to the next integer */
629 break;
630 case ZD_CCK_RATE_11M:
631 if (service) {
632 u32 t = bits % 11;
633 *service &= ~ZD_PLCP_SERVICE_LENGTH_EXTENSION;
634 if (0 < t && t <= 3) {
635 *service |= ZD_PLCP_SERVICE_LENGTH_EXTENSION;
636 }
637 }
638 bits += 10; /* round up to the next integer */
639 break;
640 }
641
642 return bits/divisor;
643 }
644
cs_set_control(struct zd_mac * mac,struct zd_ctrlset * cs,struct ieee80211_hdr * header,struct ieee80211_tx_info * info)645 static void cs_set_control(struct zd_mac *mac, struct zd_ctrlset *cs,
646 struct ieee80211_hdr *header,
647 struct ieee80211_tx_info *info)
648 {
649 /*
650 * CONTROL TODO:
651 * - if backoff needed, enable bit 0
652 * - if burst (backoff not needed) disable bit 0
653 */
654
655 cs->control = 0;
656
657 /* First fragment */
658 if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)
659 cs->control |= ZD_CS_NEED_RANDOM_BACKOFF;
660
661 /* No ACK expected (multicast, etc.) */
662 if (info->flags & IEEE80211_TX_CTL_NO_ACK)
663 cs->control |= ZD_CS_NO_ACK;
664
665 /* PS-POLL */
666 if (ieee80211_is_pspoll(header->frame_control))
667 cs->control |= ZD_CS_PS_POLL_FRAME;
668
669 if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
670 cs->control |= ZD_CS_RTS;
671
672 if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
673 cs->control |= ZD_CS_SELF_CTS;
674
675 /* FIXME: Management frame? */
676 }
677
zd_mac_match_cur_beacon(struct zd_mac * mac,struct sk_buff * beacon)678 static bool zd_mac_match_cur_beacon(struct zd_mac *mac, struct sk_buff *beacon)
679 {
680 if (!mac->beacon.cur_beacon)
681 return false;
682
683 if (mac->beacon.cur_beacon->len != beacon->len)
684 return false;
685
686 return !memcmp(beacon->data, mac->beacon.cur_beacon->data, beacon->len);
687 }
688
zd_mac_free_cur_beacon_locked(struct zd_mac * mac)689 static void zd_mac_free_cur_beacon_locked(struct zd_mac *mac)
690 {
691 ZD_ASSERT(mutex_is_locked(&mac->chip.mutex));
692
693 kfree_skb(mac->beacon.cur_beacon);
694 mac->beacon.cur_beacon = NULL;
695 }
696
zd_mac_free_cur_beacon(struct zd_mac * mac)697 static void zd_mac_free_cur_beacon(struct zd_mac *mac)
698 {
699 mutex_lock(&mac->chip.mutex);
700 zd_mac_free_cur_beacon_locked(mac);
701 mutex_unlock(&mac->chip.mutex);
702 }
703
zd_mac_config_beacon(struct ieee80211_hw * hw,struct sk_buff * beacon,bool in_intr)704 static int zd_mac_config_beacon(struct ieee80211_hw *hw, struct sk_buff *beacon,
705 bool in_intr)
706 {
707 struct zd_mac *mac = zd_hw_mac(hw);
708 int r, ret, num_cmds, req_pos = 0;
709 u32 tmp, j = 0;
710 /* 4 more bytes for tail CRC */
711 u32 full_len = beacon->len + 4;
712 unsigned long end_jiffies, message_jiffies;
713 struct zd_ioreq32 *ioreqs;
714
715 mutex_lock(&mac->chip.mutex);
716
717 /* Check if hw already has this beacon. */
718 if (zd_mac_match_cur_beacon(mac, beacon)) {
719 r = 0;
720 goto out_nofree;
721 }
722
723 /* Alloc memory for full beacon write at once. */
724 num_cmds = 1 + zd_chip_is_zd1211b(&mac->chip) + full_len;
725 ioreqs = kmalloc_objs(struct zd_ioreq32, num_cmds);
726 if (!ioreqs) {
727 r = -ENOMEM;
728 goto out_nofree;
729 }
730
731 r = zd_iowrite32_locked(&mac->chip, 0, CR_BCN_FIFO_SEMAPHORE);
732 if (r < 0)
733 goto out;
734 r = zd_ioread32_locked(&mac->chip, &tmp, CR_BCN_FIFO_SEMAPHORE);
735 if (r < 0)
736 goto release_sema;
737 if (in_intr && tmp & 0x2) {
738 r = -EBUSY;
739 goto release_sema;
740 }
741
742 end_jiffies = jiffies + HZ / 2; /*~500ms*/
743 message_jiffies = jiffies + HZ / 10; /*~100ms*/
744 while (tmp & 0x2) {
745 r = zd_ioread32_locked(&mac->chip, &tmp, CR_BCN_FIFO_SEMAPHORE);
746 if (r < 0)
747 goto release_sema;
748 if (time_is_before_eq_jiffies(message_jiffies)) {
749 message_jiffies = jiffies + HZ / 10;
750 dev_err(zd_mac_dev(mac),
751 "CR_BCN_FIFO_SEMAPHORE not ready\n");
752 if (time_is_before_eq_jiffies(end_jiffies)) {
753 dev_err(zd_mac_dev(mac),
754 "Giving up beacon config.\n");
755 r = -ETIMEDOUT;
756 goto reset_device;
757 }
758 }
759 msleep(20);
760 }
761
762 ioreqs[req_pos].addr = CR_BCN_FIFO;
763 ioreqs[req_pos].value = full_len - 1;
764 req_pos++;
765 if (zd_chip_is_zd1211b(&mac->chip)) {
766 ioreqs[req_pos].addr = CR_BCN_LENGTH;
767 ioreqs[req_pos].value = full_len - 1;
768 req_pos++;
769 }
770
771 for (j = 0 ; j < beacon->len; j++) {
772 ioreqs[req_pos].addr = CR_BCN_FIFO;
773 ioreqs[req_pos].value = *((u8 *)(beacon->data + j));
774 req_pos++;
775 }
776
777 for (j = 0; j < 4; j++) {
778 ioreqs[req_pos].addr = CR_BCN_FIFO;
779 ioreqs[req_pos].value = 0x0;
780 req_pos++;
781 }
782
783 BUG_ON(req_pos != num_cmds);
784
785 r = zd_iowrite32a_locked(&mac->chip, ioreqs, num_cmds);
786
787 release_sema:
788 /*
789 * Try very hard to release device beacon semaphore, as otherwise
790 * device/driver can be left in unusable state.
791 */
792 end_jiffies = jiffies + HZ / 2; /*~500ms*/
793 ret = zd_iowrite32_locked(&mac->chip, 1, CR_BCN_FIFO_SEMAPHORE);
794 while (ret < 0) {
795 if (in_intr || time_is_before_eq_jiffies(end_jiffies)) {
796 ret = -ETIMEDOUT;
797 break;
798 }
799
800 msleep(20);
801 ret = zd_iowrite32_locked(&mac->chip, 1, CR_BCN_FIFO_SEMAPHORE);
802 }
803
804 if (ret < 0)
805 dev_err(zd_mac_dev(mac), "Could not release "
806 "CR_BCN_FIFO_SEMAPHORE!\n");
807 if (r < 0 || ret < 0) {
808 if (r >= 0)
809 r = ret;
810
811 /* We don't know if beacon was written successfully or not,
812 * so clear current. */
813 zd_mac_free_cur_beacon_locked(mac);
814
815 goto out;
816 }
817
818 /* Beacon has now been written successfully, update current. */
819 zd_mac_free_cur_beacon_locked(mac);
820 mac->beacon.cur_beacon = beacon;
821 beacon = NULL;
822
823 /* 802.11b/g 2.4G CCK 1Mb
824 * 802.11a, not yet implemented, uses different values (see GPL vendor
825 * driver)
826 */
827 r = zd_iowrite32_locked(&mac->chip, 0x00000400 | (full_len << 19),
828 CR_BCN_PLCP_CFG);
829 out:
830 kfree(ioreqs);
831 out_nofree:
832 kfree_skb(beacon);
833 mutex_unlock(&mac->chip.mutex);
834
835 return r;
836
837 reset_device:
838 zd_mac_free_cur_beacon_locked(mac);
839 kfree_skb(beacon);
840
841 mutex_unlock(&mac->chip.mutex);
842 kfree(ioreqs);
843
844 /* semaphore stuck, reset device to avoid fw freeze later */
845 dev_warn(zd_mac_dev(mac), "CR_BCN_FIFO_SEMAPHORE stuck, "
846 "resetting device...");
847 usb_queue_reset_device(mac->chip.usb.intf);
848
849 return r;
850 }
851
fill_ctrlset(struct zd_mac * mac,struct sk_buff * skb)852 static int fill_ctrlset(struct zd_mac *mac,
853 struct sk_buff *skb)
854 {
855 int r;
856 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
857 unsigned int frag_len = skb->len + FCS_LEN;
858 unsigned int packet_length;
859 struct ieee80211_rate *txrate;
860 struct zd_ctrlset *cs = skb_push(skb, sizeof(struct zd_ctrlset));
861 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
862
863 ZD_ASSERT(frag_len <= 0xffff);
864
865 /*
866 * Firmware computes the duration itself (for all frames except PSPoll)
867 * and needs the field set to 0 at input, otherwise firmware messes up
868 * duration_id and sets bits 14 and 15 on.
869 */
870 if (!ieee80211_is_pspoll(hdr->frame_control))
871 hdr->duration_id = 0;
872
873 txrate = ieee80211_get_tx_rate(mac->hw, info);
874
875 cs->modulation = txrate->hw_value;
876 if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
877 cs->modulation = txrate->hw_value_short;
878
879 cs->tx_length = cpu_to_le16(frag_len);
880
881 cs_set_control(mac, cs, hdr, info);
882
883 packet_length = frag_len + sizeof(struct zd_ctrlset) + 10;
884 ZD_ASSERT(packet_length <= 0xffff);
885 /* ZD1211B: Computing the length difference this way, gives us
886 * flexibility to compute the packet length.
887 */
888 cs->packet_length = cpu_to_le16(zd_chip_is_zd1211b(&mac->chip) ?
889 packet_length - frag_len : packet_length);
890
891 /*
892 * CURRENT LENGTH:
893 * - transmit frame length in microseconds
894 * - seems to be derived from frame length
895 * - see Cal_Us_Service() in zdinlinef.h
896 * - if macp->bTxBurstEnable is enabled, then multiply by 4
897 * - bTxBurstEnable is never set in the vendor driver
898 *
899 * SERVICE:
900 * - "for PLCP configuration"
901 * - always 0 except in some situations at 802.11b 11M
902 * - see line 53 of zdinlinef.h
903 */
904 cs->service = 0;
905 r = zd_calc_tx_length_us(&cs->service, ZD_RATE(cs->modulation),
906 le16_to_cpu(cs->tx_length));
907 if (r < 0)
908 return r;
909 cs->current_length = cpu_to_le16(r);
910 cs->next_frame_length = 0;
911
912 return 0;
913 }
914
915 /**
916 * zd_op_tx - transmits a network frame to the device
917 *
918 * @hw: a &struct ieee80211_hw pointer
919 * @control: the control structure
920 * @skb: socket buffer
921 *
922 * This function transmit an IEEE 802.11 network frame to the device. The
923 * control block of the skbuff will be initialized. If necessary the incoming
924 * mac80211 queues will be stopped.
925 */
zd_op_tx(struct ieee80211_hw * hw,struct ieee80211_tx_control * control,struct sk_buff * skb)926 static void zd_op_tx(struct ieee80211_hw *hw,
927 struct ieee80211_tx_control *control,
928 struct sk_buff *skb)
929 {
930 struct zd_mac *mac = zd_hw_mac(hw);
931 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
932 int r;
933
934 r = fill_ctrlset(mac, skb);
935 if (r)
936 goto fail;
937
938 info->rate_driver_data[0] = hw;
939
940 r = zd_usb_tx(&mac->chip.usb, skb);
941 if (r)
942 goto fail;
943 return;
944
945 fail:
946 dev_kfree_skb(skb);
947 }
948
949 /**
950 * filter_ack - filters incoming packets for acknowledgements
951 * @hw: a &struct ieee80211_hw pointer
952 * @rx_hdr: received header
953 * @stats: the status for the received packet
954 *
955 * This functions looks for ACK packets and tries to match them with the
956 * frames in the tx queue. If a match is found the frame will be dequeued and
957 * the upper layers is informed about the successful transmission. If
958 * mac80211 queues have been stopped and the number of frames still to be
959 * transmitted is low the queues will be opened again.
960 *
961 * Returns 1 if the frame was an ACK, 0 if it was ignored.
962 */
filter_ack(struct ieee80211_hw * hw,struct ieee80211_hdr * rx_hdr,struct ieee80211_rx_status * stats)963 static int filter_ack(struct ieee80211_hw *hw, struct ieee80211_hdr *rx_hdr,
964 struct ieee80211_rx_status *stats)
965 {
966 struct zd_mac *mac = zd_hw_mac(hw);
967 struct sk_buff *skb;
968 struct sk_buff_head *q;
969 unsigned long flags;
970 int found = 0;
971 int i, position = 0;
972
973 if (!ieee80211_is_ack(rx_hdr->frame_control))
974 return 0;
975
976 q = &mac->ack_wait_queue;
977 spin_lock_irqsave(&q->lock, flags);
978 skb_queue_walk(q, skb) {
979 struct ieee80211_hdr *tx_hdr;
980
981 position ++;
982
983 if (mac->ack_pending && skb_queue_is_first(q, skb))
984 continue;
985
986 tx_hdr = (struct ieee80211_hdr *)skb->data;
987 if (likely(ether_addr_equal(tx_hdr->addr2, rx_hdr->addr1)))
988 {
989 found = 1;
990 break;
991 }
992 }
993
994 if (found) {
995 for (i=1; i<position; i++) {
996 skb = __skb_dequeue(q);
997 zd_mac_tx_status(hw, skb,
998 mac->ack_pending ? mac->ack_signal : 0,
999 NULL);
1000 mac->ack_pending = 0;
1001 }
1002
1003 mac->ack_pending = 1;
1004 mac->ack_signal = stats->signal;
1005
1006 /* Prevent pending tx-packet on AP-mode */
1007 if (mac->type == NL80211_IFTYPE_AP) {
1008 skb = __skb_dequeue(q);
1009 zd_mac_tx_status(hw, skb, mac->ack_signal, NULL);
1010 mac->ack_pending = 0;
1011 }
1012 }
1013
1014 spin_unlock_irqrestore(&q->lock, flags);
1015 return 1;
1016 }
1017
zd_mac_rx(struct ieee80211_hw * hw,const u8 * buffer,unsigned int length)1018 int zd_mac_rx(struct ieee80211_hw *hw, const u8 *buffer, unsigned int length)
1019 {
1020 struct zd_mac *mac = zd_hw_mac(hw);
1021 struct ieee80211_rx_status stats;
1022 const struct rx_status *status;
1023 struct sk_buff *skb;
1024 int bad_frame = 0;
1025 __le16 fc;
1026 int need_padding;
1027 int i;
1028 u8 rate;
1029
1030 if (length < ZD_PLCP_HEADER_SIZE + 10 /* IEEE80211_1ADDR_LEN */ +
1031 FCS_LEN + sizeof(struct rx_status))
1032 return -EINVAL;
1033
1034 memset(&stats, 0, sizeof(stats));
1035
1036 /* Note about pass_failed_fcs and pass_ctrl access below:
1037 * mac locking intentionally omitted here, as this is the only unlocked
1038 * reader and the only writer is configure_filter. Plus, if there were
1039 * any races accessing these variables, it wouldn't really matter.
1040 * If mac80211 ever provides a way for us to access filter flags
1041 * from outside configure_filter, we could improve on this. Also, this
1042 * situation may change once we implement some kind of DMA-into-skb
1043 * RX path. */
1044
1045 /* Caller has to ensure that length >= sizeof(struct rx_status). */
1046 status = (struct rx_status *)
1047 (buffer + (length - sizeof(struct rx_status)));
1048 if (status->frame_status & ZD_RX_ERROR) {
1049 if (mac->pass_failed_fcs &&
1050 (status->frame_status & ZD_RX_CRC32_ERROR)) {
1051 stats.flag |= RX_FLAG_FAILED_FCS_CRC;
1052 bad_frame = 1;
1053 } else {
1054 return -EINVAL;
1055 }
1056 }
1057
1058 stats.freq = zd_channels[_zd_chip_get_channel(&mac->chip) - 1].center_freq;
1059 stats.band = NL80211_BAND_2GHZ;
1060 stats.signal = zd_check_signal(hw, status->signal_strength);
1061
1062 rate = zd_rx_rate(buffer, status);
1063
1064 /* todo: return index in the big switches in zd_rx_rate instead */
1065 for (i = 0; i < mac->band.n_bitrates; i++)
1066 if (rate == mac->band.bitrates[i].hw_value)
1067 stats.rate_idx = i;
1068
1069 length -= ZD_PLCP_HEADER_SIZE + sizeof(struct rx_status);
1070 buffer += ZD_PLCP_HEADER_SIZE;
1071
1072 /* Except for bad frames, filter each frame to see if it is an ACK, in
1073 * which case our internal TX tracking is updated. Normally we then
1074 * bail here as there's no need to pass ACKs on up to the stack, but
1075 * there is also the case where the stack has requested us to pass
1076 * control frames on up (pass_ctrl) which we must consider. */
1077 if (!bad_frame &&
1078 filter_ack(hw, (struct ieee80211_hdr *)buffer, &stats)
1079 && !mac->pass_ctrl)
1080 return 0;
1081
1082 fc = get_unaligned((__le16*)buffer);
1083 need_padding = ieee80211_is_data_qos(fc) ^ ieee80211_has_a4(fc);
1084
1085 skb = dev_alloc_skb(length + (need_padding ? 2 : 0));
1086 if (skb == NULL)
1087 return -ENOMEM;
1088 if (need_padding) {
1089 /* Make sure the payload data is 4 byte aligned. */
1090 skb_reserve(skb, 2);
1091 }
1092
1093 /* FIXME : could we avoid this big memcpy ? */
1094 skb_put_data(skb, buffer, length);
1095
1096 memcpy(IEEE80211_SKB_RXCB(skb), &stats, sizeof(stats));
1097 ieee80211_rx_irqsafe(hw, skb);
1098 return 0;
1099 }
1100
zd_op_add_interface(struct ieee80211_hw * hw,struct ieee80211_vif * vif)1101 static int zd_op_add_interface(struct ieee80211_hw *hw,
1102 struct ieee80211_vif *vif)
1103 {
1104 struct zd_mac *mac = zd_hw_mac(hw);
1105
1106 /* using NL80211_IFTYPE_UNSPECIFIED to indicate no mode selected */
1107 if (mac->type != NL80211_IFTYPE_UNSPECIFIED)
1108 return -EOPNOTSUPP;
1109
1110 switch (vif->type) {
1111 case NL80211_IFTYPE_MONITOR:
1112 case NL80211_IFTYPE_MESH_POINT:
1113 case NL80211_IFTYPE_STATION:
1114 case NL80211_IFTYPE_ADHOC:
1115 case NL80211_IFTYPE_AP:
1116 mac->type = vif->type;
1117 break;
1118 default:
1119 return -EOPNOTSUPP;
1120 }
1121
1122 mac->vif = vif;
1123
1124 return set_mac_and_bssid(mac);
1125 }
1126
zd_op_remove_interface(struct ieee80211_hw * hw,struct ieee80211_vif * vif)1127 static void zd_op_remove_interface(struct ieee80211_hw *hw,
1128 struct ieee80211_vif *vif)
1129 {
1130 struct zd_mac *mac = zd_hw_mac(hw);
1131 mac->type = NL80211_IFTYPE_UNSPECIFIED;
1132 mac->vif = NULL;
1133 zd_set_beacon_interval(&mac->chip, 0, 0, NL80211_IFTYPE_UNSPECIFIED);
1134 zd_write_mac_addr(&mac->chip, NULL);
1135
1136 zd_mac_free_cur_beacon(mac);
1137 }
1138
zd_op_config(struct ieee80211_hw * hw,int radio_idx,u32 changed)1139 static int zd_op_config(struct ieee80211_hw *hw, int radio_idx, u32 changed)
1140 {
1141 struct zd_mac *mac = zd_hw_mac(hw);
1142 struct ieee80211_conf *conf = &hw->conf;
1143
1144 spin_lock_irq(&mac->lock);
1145 mac->channel = conf->chandef.chan->hw_value;
1146 spin_unlock_irq(&mac->lock);
1147
1148 return zd_chip_set_channel(&mac->chip, conf->chandef.chan->hw_value);
1149 }
1150
zd_beacon_done(struct zd_mac * mac)1151 static void zd_beacon_done(struct zd_mac *mac)
1152 {
1153 struct sk_buff *skb, *beacon;
1154
1155 if (!test_bit(ZD_DEVICE_RUNNING, &mac->flags))
1156 return;
1157 if (!mac->vif || mac->vif->type != NL80211_IFTYPE_AP)
1158 return;
1159
1160 /*
1161 * Send out buffered broad- and multicast frames.
1162 */
1163 while (!ieee80211_queue_stopped(mac->hw, 0)) {
1164 skb = ieee80211_get_buffered_bc(mac->hw, mac->vif);
1165 if (!skb)
1166 break;
1167 zd_op_tx(mac->hw, NULL, skb);
1168 }
1169
1170 /*
1171 * Fetch next beacon so that tim_count is updated.
1172 */
1173 beacon = ieee80211_beacon_get(mac->hw, mac->vif, 0);
1174 if (beacon)
1175 zd_mac_config_beacon(mac->hw, beacon, true);
1176
1177 spin_lock_irq(&mac->lock);
1178 mac->beacon.last_update = jiffies;
1179 spin_unlock_irq(&mac->lock);
1180 }
1181
zd_process_intr(struct work_struct * work)1182 static void zd_process_intr(struct work_struct *work)
1183 {
1184 u16 int_status;
1185 unsigned long flags;
1186 struct zd_mac *mac = container_of(work, struct zd_mac, process_intr);
1187
1188 spin_lock_irqsave(&mac->lock, flags);
1189 int_status = le16_to_cpu(*(__le16 *)(mac->intr_buffer + 4));
1190 spin_unlock_irqrestore(&mac->lock, flags);
1191
1192 if (int_status & INT_CFG_NEXT_BCN) {
1193 /*dev_dbg_f_limit(zd_mac_dev(mac), "INT_CFG_NEXT_BCN\n");*/
1194 zd_beacon_done(mac);
1195 } else {
1196 dev_dbg_f(zd_mac_dev(mac), "Unsupported interrupt\n");
1197 }
1198
1199 zd_chip_enable_hwint(&mac->chip);
1200 }
1201
1202
zd_op_prepare_multicast(struct ieee80211_hw * hw,struct netdev_hw_addr_list * mc_list)1203 static u64 zd_op_prepare_multicast(struct ieee80211_hw *hw,
1204 struct netdev_hw_addr_list *mc_list)
1205 {
1206 struct zd_mac *mac = zd_hw_mac(hw);
1207 struct zd_mc_hash hash;
1208 struct netdev_hw_addr *ha;
1209
1210 zd_mc_clear(&hash);
1211
1212 netdev_hw_addr_list_for_each(ha, mc_list) {
1213 dev_dbg_f(zd_mac_dev(mac), "mc addr %pM\n", ha->addr);
1214 zd_mc_add_addr(&hash, ha->addr);
1215 }
1216
1217 return hash.low | ((u64)hash.high << 32);
1218 }
1219
1220 #define SUPPORTED_FIF_FLAGS \
1221 (FIF_ALLMULTI | FIF_FCSFAIL | FIF_CONTROL | \
1222 FIF_OTHER_BSS | FIF_BCN_PRBRESP_PROMISC)
zd_op_configure_filter(struct ieee80211_hw * hw,unsigned int changed_flags,unsigned int * new_flags,u64 multicast)1223 static void zd_op_configure_filter(struct ieee80211_hw *hw,
1224 unsigned int changed_flags,
1225 unsigned int *new_flags,
1226 u64 multicast)
1227 {
1228 struct zd_mc_hash hash = {
1229 .low = multicast,
1230 .high = multicast >> 32,
1231 };
1232 struct zd_mac *mac = zd_hw_mac(hw);
1233 unsigned long flags;
1234 int r;
1235
1236 /* Only deal with supported flags */
1237 changed_flags &= SUPPORTED_FIF_FLAGS;
1238 *new_flags &= SUPPORTED_FIF_FLAGS;
1239
1240 /*
1241 * If multicast parameter (as returned by zd_op_prepare_multicast)
1242 * has changed, no bit in changed_flags is set. To handle this
1243 * situation, we do not return if changed_flags is 0. If we do so,
1244 * we will have some issue with IPv6 which uses multicast for link
1245 * layer address resolution.
1246 */
1247 if (*new_flags & FIF_ALLMULTI)
1248 zd_mc_add_all(&hash);
1249
1250 spin_lock_irqsave(&mac->lock, flags);
1251 mac->pass_failed_fcs = !!(*new_flags & FIF_FCSFAIL);
1252 mac->pass_ctrl = !!(*new_flags & FIF_CONTROL);
1253 mac->multicast_hash = hash;
1254 spin_unlock_irqrestore(&mac->lock, flags);
1255
1256 zd_chip_set_multicast_hash(&mac->chip, &hash);
1257
1258 if (changed_flags & FIF_CONTROL) {
1259 r = set_rx_filter(mac);
1260 if (r)
1261 dev_err(zd_mac_dev(mac), "set_rx_filter error %d\n", r);
1262 }
1263
1264 /* no handling required for FIF_OTHER_BSS as we don't currently
1265 * do BSSID filtering */
1266 /* FIXME: in future it would be nice to enable the probe response
1267 * filter (so that the driver doesn't see them) until
1268 * FIF_BCN_PRBRESP_PROMISC is set. however due to atomicity here, we'd
1269 * have to schedule work to enable prbresp reception, which might
1270 * happen too late. For now we'll just listen and forward them all the
1271 * time. */
1272 }
1273
set_rts_cts(struct zd_mac * mac,unsigned int short_preamble)1274 static void set_rts_cts(struct zd_mac *mac, unsigned int short_preamble)
1275 {
1276 mutex_lock(&mac->chip.mutex);
1277 zd_chip_set_rts_cts_rate_locked(&mac->chip, short_preamble);
1278 mutex_unlock(&mac->chip.mutex);
1279 }
1280
zd_op_bss_info_changed(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_bss_conf * bss_conf,u64 changes)1281 static void zd_op_bss_info_changed(struct ieee80211_hw *hw,
1282 struct ieee80211_vif *vif,
1283 struct ieee80211_bss_conf *bss_conf,
1284 u64 changes)
1285 {
1286 struct zd_mac *mac = zd_hw_mac(hw);
1287 int associated;
1288
1289 dev_dbg_f(zd_mac_dev(mac), "changes: %llx\n", changes);
1290
1291 if (mac->type == NL80211_IFTYPE_MESH_POINT ||
1292 mac->type == NL80211_IFTYPE_ADHOC ||
1293 mac->type == NL80211_IFTYPE_AP) {
1294 associated = true;
1295 if (changes & BSS_CHANGED_BEACON) {
1296 struct sk_buff *beacon = ieee80211_beacon_get(hw, vif,
1297 0);
1298
1299 if (beacon) {
1300 zd_chip_disable_hwint(&mac->chip);
1301 zd_mac_config_beacon(hw, beacon, false);
1302 zd_chip_enable_hwint(&mac->chip);
1303 }
1304 }
1305
1306 if (changes & BSS_CHANGED_BEACON_ENABLED) {
1307 u16 interval = 0;
1308 u8 period = 0;
1309
1310 if (bss_conf->enable_beacon) {
1311 period = bss_conf->dtim_period;
1312 interval = bss_conf->beacon_int;
1313 }
1314
1315 spin_lock_irq(&mac->lock);
1316 mac->beacon.period = period;
1317 mac->beacon.interval = interval;
1318 mac->beacon.last_update = jiffies;
1319 spin_unlock_irq(&mac->lock);
1320
1321 zd_set_beacon_interval(&mac->chip, interval, period,
1322 mac->type);
1323 }
1324 } else
1325 associated = is_valid_ether_addr(bss_conf->bssid);
1326
1327 spin_lock_irq(&mac->lock);
1328 mac->associated = associated;
1329 spin_unlock_irq(&mac->lock);
1330
1331 /* TODO: do hardware bssid filtering */
1332
1333 if (changes & BSS_CHANGED_ERP_PREAMBLE) {
1334 spin_lock_irq(&mac->lock);
1335 mac->short_preamble = bss_conf->use_short_preamble;
1336 spin_unlock_irq(&mac->lock);
1337
1338 set_rts_cts(mac, bss_conf->use_short_preamble);
1339 }
1340 }
1341
zd_op_get_tsf(struct ieee80211_hw * hw,struct ieee80211_vif * vif)1342 static u64 zd_op_get_tsf(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
1343 {
1344 struct zd_mac *mac = zd_hw_mac(hw);
1345 return zd_chip_get_tsf(&mac->chip);
1346 }
1347
1348 static const struct ieee80211_ops zd_ops = {
1349 .add_chanctx = ieee80211_emulate_add_chanctx,
1350 .remove_chanctx = ieee80211_emulate_remove_chanctx,
1351 .change_chanctx = ieee80211_emulate_change_chanctx,
1352 .switch_vif_chanctx = ieee80211_emulate_switch_vif_chanctx,
1353 .tx = zd_op_tx,
1354 .wake_tx_queue = ieee80211_handle_wake_tx_queue,
1355 .start = zd_op_start,
1356 .stop = zd_op_stop,
1357 .add_interface = zd_op_add_interface,
1358 .remove_interface = zd_op_remove_interface,
1359 .config = zd_op_config,
1360 .prepare_multicast = zd_op_prepare_multicast,
1361 .configure_filter = zd_op_configure_filter,
1362 .bss_info_changed = zd_op_bss_info_changed,
1363 .get_tsf = zd_op_get_tsf,
1364 };
1365
zd_mac_alloc_hw(struct usb_interface * intf)1366 struct ieee80211_hw *zd_mac_alloc_hw(struct usb_interface *intf)
1367 {
1368 struct zd_mac *mac;
1369 struct ieee80211_hw *hw;
1370
1371 hw = ieee80211_alloc_hw(sizeof(struct zd_mac), &zd_ops);
1372 if (!hw) {
1373 dev_dbg_f(&intf->dev, "out of memory\n");
1374 return NULL;
1375 }
1376
1377 mac = zd_hw_mac(hw);
1378
1379 memset(mac, 0, sizeof(*mac));
1380 spin_lock_init(&mac->lock);
1381 mac->hw = hw;
1382
1383 mac->type = NL80211_IFTYPE_UNSPECIFIED;
1384
1385 memcpy(mac->channels, zd_channels, sizeof(zd_channels));
1386 memcpy(mac->rates, zd_rates, sizeof(zd_rates));
1387 mac->band.n_bitrates = ARRAY_SIZE(zd_rates);
1388 mac->band.bitrates = mac->rates;
1389 mac->band.n_channels = ARRAY_SIZE(zd_channels);
1390 mac->band.channels = mac->channels;
1391
1392 hw->wiphy->bands[NL80211_BAND_2GHZ] = &mac->band;
1393
1394 ieee80211_hw_set(hw, MFP_CAPABLE);
1395 ieee80211_hw_set(hw, HOST_BROADCAST_PS_BUFFERING);
1396 ieee80211_hw_set(hw, RX_INCLUDES_FCS);
1397 ieee80211_hw_set(hw, SIGNAL_UNSPEC);
1398
1399 hw->wiphy->interface_modes =
1400 BIT(NL80211_IFTYPE_MESH_POINT) |
1401 BIT(NL80211_IFTYPE_STATION) |
1402 BIT(NL80211_IFTYPE_ADHOC) |
1403 BIT(NL80211_IFTYPE_AP);
1404
1405 wiphy_ext_feature_set(hw->wiphy, NL80211_EXT_FEATURE_CQM_RSSI_LIST);
1406
1407 hw->max_signal = 100;
1408 hw->queues = 1;
1409 hw->extra_tx_headroom = sizeof(struct zd_ctrlset);
1410
1411 /*
1412 * Tell mac80211 that we support multi rate retries
1413 */
1414 hw->max_rates = IEEE80211_TX_MAX_RATES;
1415 hw->max_rate_tries = 18; /* 9 rates * 2 retries/rate */
1416
1417 skb_queue_head_init(&mac->ack_wait_queue);
1418 mac->ack_pending = 0;
1419
1420 zd_chip_init(&mac->chip, hw, intf);
1421 housekeeping_init(mac);
1422 beacon_init(mac);
1423 INIT_WORK(&mac->process_intr, zd_process_intr);
1424
1425 SET_IEEE80211_DEV(hw, &intf->dev);
1426 return hw;
1427 }
1428
1429 #define BEACON_WATCHDOG_DELAY round_jiffies_relative(HZ)
1430
beacon_watchdog_handler(struct work_struct * work)1431 static void beacon_watchdog_handler(struct work_struct *work)
1432 {
1433 struct zd_mac *mac =
1434 container_of(work, struct zd_mac, beacon.watchdog_work.work);
1435 struct sk_buff *beacon;
1436 unsigned long timeout;
1437 int interval, period;
1438
1439 if (!test_bit(ZD_DEVICE_RUNNING, &mac->flags))
1440 goto rearm;
1441 if (mac->type != NL80211_IFTYPE_AP || !mac->vif)
1442 goto rearm;
1443
1444 spin_lock_irq(&mac->lock);
1445 interval = mac->beacon.interval;
1446 period = mac->beacon.period;
1447 timeout = mac->beacon.last_update +
1448 msecs_to_jiffies(interval * 1024 / 1000) * 3;
1449 spin_unlock_irq(&mac->lock);
1450
1451 if (interval > 0 && time_is_before_jiffies(timeout)) {
1452 dev_dbg_f(zd_mac_dev(mac), "beacon interrupt stalled, "
1453 "restarting. "
1454 "(interval: %d, dtim: %d)\n",
1455 interval, period);
1456
1457 zd_chip_disable_hwint(&mac->chip);
1458
1459 beacon = ieee80211_beacon_get(mac->hw, mac->vif, 0);
1460 if (beacon) {
1461 zd_mac_free_cur_beacon(mac);
1462
1463 zd_mac_config_beacon(mac->hw, beacon, false);
1464 }
1465
1466 zd_set_beacon_interval(&mac->chip, interval, period, mac->type);
1467
1468 zd_chip_enable_hwint(&mac->chip);
1469
1470 spin_lock_irq(&mac->lock);
1471 mac->beacon.last_update = jiffies;
1472 spin_unlock_irq(&mac->lock);
1473 }
1474
1475 rearm:
1476 queue_delayed_work(zd_workqueue, &mac->beacon.watchdog_work,
1477 BEACON_WATCHDOG_DELAY);
1478 }
1479
beacon_init(struct zd_mac * mac)1480 static void beacon_init(struct zd_mac *mac)
1481 {
1482 INIT_DELAYED_WORK(&mac->beacon.watchdog_work, beacon_watchdog_handler);
1483 }
1484
beacon_enable(struct zd_mac * mac)1485 static void beacon_enable(struct zd_mac *mac)
1486 {
1487 dev_dbg_f(zd_mac_dev(mac), "\n");
1488
1489 mac->beacon.last_update = jiffies;
1490 queue_delayed_work(zd_workqueue, &mac->beacon.watchdog_work,
1491 BEACON_WATCHDOG_DELAY);
1492 }
1493
beacon_disable(struct zd_mac * mac)1494 static void beacon_disable(struct zd_mac *mac)
1495 {
1496 dev_dbg_f(zd_mac_dev(mac), "\n");
1497 cancel_delayed_work_sync(&mac->beacon.watchdog_work);
1498
1499 zd_mac_free_cur_beacon(mac);
1500 }
1501
1502 #define LINK_LED_WORK_DELAY HZ
1503
link_led_handler(struct work_struct * work)1504 static void link_led_handler(struct work_struct *work)
1505 {
1506 struct zd_mac *mac =
1507 container_of(work, struct zd_mac, housekeeping.link_led_work.work);
1508 struct zd_chip *chip = &mac->chip;
1509 int is_associated;
1510 int r;
1511
1512 if (!test_bit(ZD_DEVICE_RUNNING, &mac->flags))
1513 goto requeue;
1514
1515 spin_lock_irq(&mac->lock);
1516 is_associated = mac->associated;
1517 spin_unlock_irq(&mac->lock);
1518
1519 r = zd_chip_control_leds(chip,
1520 is_associated ? ZD_LED_ASSOCIATED : ZD_LED_SCANNING);
1521 if (r)
1522 dev_dbg_f(zd_mac_dev(mac), "zd_chip_control_leds error %d\n", r);
1523
1524 requeue:
1525 queue_delayed_work(zd_workqueue, &mac->housekeeping.link_led_work,
1526 LINK_LED_WORK_DELAY);
1527 }
1528
housekeeping_init(struct zd_mac * mac)1529 static void housekeeping_init(struct zd_mac *mac)
1530 {
1531 INIT_DELAYED_WORK(&mac->housekeeping.link_led_work, link_led_handler);
1532 }
1533
housekeeping_enable(struct zd_mac * mac)1534 static void housekeeping_enable(struct zd_mac *mac)
1535 {
1536 dev_dbg_f(zd_mac_dev(mac), "\n");
1537 queue_delayed_work(zd_workqueue, &mac->housekeeping.link_led_work,
1538 0);
1539 }
1540
housekeeping_disable(struct zd_mac * mac)1541 static void housekeeping_disable(struct zd_mac *mac)
1542 {
1543 dev_dbg_f(zd_mac_dev(mac), "\n");
1544 cancel_delayed_work_sync(&mac->housekeeping.link_led_work);
1545 zd_chip_control_leds(&mac->chip, ZD_LED_OFF);
1546 }
1547