1	/*
2	* Atheros CARL9170 driver
3	*
4	* 802.11 xmit & status routines
5	*
6	* Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
7	* Copyright 2009, 2010, Christian Lamparter <chunkeey@googlemail.com>
8	*
9	* This program is free software; you can redistribute it and/or modify
10	* it under the terms of the GNU General Public License as published by
11	* the Free Software Foundation; either version 2 of the License, or
12	* (at your option) any later version.
13	*
14	* This program is distributed in the hope that it will be useful,
15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17	* GNU General Public License for more details.
18	*
19	* You should have received a copy of the GNU General Public License
20	* along with this program; see the file COPYING. If not, see
21	* http://www.gnu.org/licenses/.
22	*
23	* This file incorporates work covered by the following copyright and
24	* permission notice:
25	* Copyright (c) 2007-2008 Atheros Communications, Inc.
26	*
27	* Permission to use, copy, modify, and/or distribute this software for any
28	* purpose with or without fee is hereby granted, provided that the above
29	* copyright notice and this permission notice appear in all copies.
30	*
31	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
32	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
33	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
34	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
35	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
36	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
37	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
38	*/
39
40	#include <linux/slab.h>
41	#include <linux/module.h>
42	#include <linux/etherdevice.h>
43	#include <net/mac80211.h>
44	#include "carl9170.h"
45	#include "hw.h"
46	#include "cmd.h"
47
48	static inline unsigned int __carl9170_get_queue(struct ar9170 *ar,
49	unsigned int queue)
50	{
51	if (unlikely(modparam_noht)) {
52	return queue;
53	} else {
54	/*
55	* This is just another workaround, until
56	* someone figures out how to get QoS and
57	* AMPDU to play nicely together.
58	*/
59
60	return 2; /* AC_BE */
61	}
62	}
63
64	static inline unsigned int carl9170_get_queue(struct ar9170 *ar,
65	struct sk_buff *skb)
66	{
67	return __carl9170_get_queue(ar, queue: skb_get_queue_mapping(skb));
68	}
69
70	static bool is_mem_full(struct ar9170 *ar)
71	{
72	return (DIV_ROUND_UP(IEEE80211_MAX_FRAME_LEN, ar->fw.mem_block_size) >
73	atomic_read(v: &ar->mem_free_blocks));
74	}
75
76	static void carl9170_tx_accounting(struct ar9170 *ar, struct sk_buff *skb)
77	{
78	int queue, i;
79	bool mem_full;
80
81	atomic_inc(v: &ar->tx_total_queued);
82
83	queue = skb_get_queue_mapping(skb);
84	spin_lock_bh(lock: &ar->tx_stats_lock);
85
86	/*
87	* The driver has to accept the frame, regardless if the queue is
88	* full to the brim, or not. We have to do the queuing internally,
89	* since mac80211 assumes that a driver which can operate with
90	* aggregated frames does not reject frames for this reason.
91	*/
92	ar->tx_stats[queue].len++;
93	ar->tx_stats[queue].count++;
94
95	mem_full = is_mem_full(ar);
96	for (i = 0; i < ar->hw->queues; i++) {
97	if (mem_full || ar->tx_stats[i].len >= ar->tx_stats[i].limit) {
98	ieee80211_stop_queue(hw: ar->hw, queue: i);
99	ar->queue_stop_timeout[i] = jiffies;
100	}
101	}
102
103	spin_unlock_bh(lock: &ar->tx_stats_lock);
104	}
105
106	/* needs rcu_read_lock */
107	static struct ieee80211_sta *__carl9170_get_tx_sta(struct ar9170 *ar,
108	struct sk_buff *skb)
109	{
110	struct _carl9170_tx_superframe *super = (void *) skb->data;
111	struct ieee80211_hdr *hdr = (void *) super->frame_data;
112	struct ieee80211_vif *vif;
113	unsigned int vif_id;
114
115	vif_id = (super->s.misc & CARL9170_TX_SUPER_MISC_VIF_ID) >>
116	CARL9170_TX_SUPER_MISC_VIF_ID_S;
117
118	if (WARN_ON_ONCE(vif_id >= AR9170_MAX_VIRTUAL_MAC))
119	return NULL;
120
121	vif = rcu_dereference(ar->vif_priv[vif_id].vif);
122	if (unlikely(!vif))
123	return NULL;
124
125	/*
126	* Normally we should use wrappers like ieee80211_get_DA to get
127	* the correct peer ieee80211_sta.
128	*
129	* But there is a problem with indirect traffic (broadcasts, or
130	* data which is designated for other stations) in station mode.
131	* The frame will be directed to the AP for distribution and not
132	* to the actual destination.
133	*/
134
135	return ieee80211_find_sta(vif, addr: hdr->addr1);
136	}
137
138	static void carl9170_tx_ps_unblock(struct ar9170 *ar, struct sk_buff *skb)
139	{
140	struct ieee80211_sta *sta;
141	struct carl9170_sta_info *sta_info;
142
143	rcu_read_lock();
144	sta = __carl9170_get_tx_sta(ar, skb);
145	if (unlikely(!sta))
146	goto out_rcu;
147
148	sta_info = (struct carl9170_sta_info *) sta->drv_priv;
149	if (atomic_dec_return(v: &sta_info->pending_frames) == 0)
150	ieee80211_sta_block_awake(hw: ar->hw, pubsta: sta, block: false);
151
152	out_rcu:
153	rcu_read_unlock();
154	}
155
156	static void carl9170_tx_accounting_free(struct ar9170 *ar, struct sk_buff *skb)
157	{
158	int queue;
159
160	queue = skb_get_queue_mapping(skb);
161
162	spin_lock_bh(lock: &ar->tx_stats_lock);
163
164	ar->tx_stats[queue].len--;
165
166	if (!is_mem_full(ar)) {
167	unsigned int i;
168	for (i = 0; i < ar->hw->queues; i++) {
169	if (ar->tx_stats[i].len >= CARL9170_NUM_TX_LIMIT_SOFT)
170	continue;
171
172	if (ieee80211_queue_stopped(hw: ar->hw, queue: i)) {
173	unsigned long tmp;
174
175	tmp = jiffies - ar->queue_stop_timeout[i];
176	if (tmp > ar->max_queue_stop_timeout[i])
177	ar->max_queue_stop_timeout[i] = tmp;
178	}
179
180	ieee80211_wake_queue(hw: ar->hw, queue: i);
181	}
182	}
183
184	spin_unlock_bh(lock: &ar->tx_stats_lock);
185
186	if (atomic_dec_and_test(v: &ar->tx_total_queued))
187	complete(&ar->tx_flush);
188	}
189
190	static int carl9170_alloc_dev_space(struct ar9170 *ar, struct sk_buff *skb)
191	{
192	struct _carl9170_tx_superframe *super;
193	unsigned int chunks;
194	int cookie = -1;
195
196	atomic_inc(v: &ar->mem_allocs);
197
198	chunks = DIV_ROUND_UP(skb->len, ar->fw.mem_block_size);
199	if (unlikely(atomic_sub_return(chunks, &ar->mem_free_blocks) < 0)) {
200	atomic_add(i: chunks, v: &ar->mem_free_blocks);
201	return -ENOSPC;
202	}
203
204	spin_lock_bh(lock: &ar->mem_lock);
205	cookie = bitmap_find_free_region(bitmap: ar->mem_bitmap, bits: ar->fw.mem_blocks, order: 0);
206	spin_unlock_bh(lock: &ar->mem_lock);
207
208	if (unlikely(cookie < 0)) {
209	atomic_add(i: chunks, v: &ar->mem_free_blocks);
210	return -ENOSPC;
211	}
212
213	super = (void *) skb->data;
214
215	/*
216	* Cookie #0 serves two special purposes:
217	* 1. The firmware might use it generate BlockACK frames
218	* in responds of an incoming BlockAckReqs.
219	*
220	* 2. Prevent double-free bugs.
221	*/
222	super->s.cookie = (u8) cookie + 1;
223	return 0;
224	}
225
226	static void carl9170_release_dev_space(struct ar9170 *ar, struct sk_buff *skb)
227	{
228	struct _carl9170_tx_superframe *super = (void *) skb->data;
229	int cookie;
230
231	/* make a local copy of the cookie */
232	cookie = super->s.cookie;
233	/* invalidate cookie */
234	super->s.cookie = 0;
235
236	/*
237	* Do a out-of-bounds check on the cookie:
238	*
239	* * cookie "0" is reserved and won't be assigned to any
240	* out-going frame. Internally however, it is used to
241	* mark no longer/un-accounted frames and serves as a
242	* cheap way of preventing frames from being freed
243	* twice by _accident_. NB: There is a tiny race...
244	*
245	* * obviously, cookie number is limited by the amount
246	* of available memory blocks, so the number can
247	* never execeed the mem_blocks count.
248	*/
249	if (WARN_ON_ONCE(cookie == 0) ||
250	WARN_ON_ONCE(cookie > ar->fw.mem_blocks))
251	return;
252
253	atomic_add(DIV_ROUND_UP(skb->len, ar->fw.mem_block_size),
254	v: &ar->mem_free_blocks);
255
256	spin_lock_bh(lock: &ar->mem_lock);
257	bitmap_release_region(bitmap: ar->mem_bitmap, pos: cookie - 1, order: 0);
258	spin_unlock_bh(lock: &ar->mem_lock);
259	}
260
261	/* Called from any context */
262	static void carl9170_tx_release(struct kref *ref)
263	{
264	struct ar9170 *ar;
265	struct carl9170_tx_info *arinfo;
266	struct ieee80211_tx_info *txinfo;
267	struct sk_buff *skb;
268
269	arinfo = container_of(ref, struct carl9170_tx_info, ref);
270	txinfo = container_of((void *) arinfo, struct ieee80211_tx_info,
271	rate_driver_data);
272	skb = container_of((void *) txinfo, struct sk_buff, cb);
273
274	ar = arinfo->ar;
275	if (WARN_ON_ONCE(!ar))
276	return;
277
278	/*
279	* This does not call ieee80211_tx_info_clear_status() because
280	* carl9170_tx_fill_rateinfo() has filled the rate information
281	* before we get to this point.
282	*/
283	memset_after(&txinfo->status, 0, rates);
284
285	if (atomic_read(v: &ar->tx_total_queued))
286	ar->tx_schedule = true;
287
288	if (txinfo->flags & IEEE80211_TX_CTL_AMPDU) {
289	if (!atomic_read(v: &ar->tx_ampdu_upload))
290	ar->tx_ampdu_schedule = true;
291
292	if (txinfo->flags & IEEE80211_TX_STAT_AMPDU) {
293	struct _carl9170_tx_superframe *super;
294
295	super = (void *)skb->data;
296	txinfo->status.ampdu_len = super->s.rix;
297	txinfo->status.ampdu_ack_len = super->s.cnt;
298	} else if ((txinfo->flags & IEEE80211_TX_STAT_ACK) &&
299	!(txinfo->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)) {
300	/*
301	* drop redundant tx_status reports:
302	*
303	* 1. ampdu_ack_len of the final tx_status does
304	* include the feedback of this particular frame.
305	*
306	* 2. tx_status_irqsafe only queues up to 128
307	* tx feedback reports and discards the rest.
308	*
309	* 3. minstrel_ht is picky, it only accepts
310	* reports of frames with the TX_STATUS_AMPDU flag.
311	*
312	* 4. mac80211 is not particularly interested in
313	* feedback either [CTL_REQ_TX_STATUS not set]
314	*/
315
316	ieee80211_free_txskb(hw: ar->hw, skb);
317	return;
318	} else {
319	/*
320	* Either the frame transmission has failed or
321	* mac80211 requested tx status.
322	*/
323	}
324	}
325
326	skb_pull(skb, len: sizeof(struct _carl9170_tx_superframe));
327	ieee80211_tx_status_irqsafe(hw: ar->hw, skb);
328	}
329
330	void carl9170_tx_get_skb(struct sk_buff *skb)
331	{
332	struct carl9170_tx_info *arinfo = (void *)
333	(IEEE80211_SKB_CB(skb))->rate_driver_data;
334	kref_get(kref: &arinfo->ref);
335	}
336
337	int carl9170_tx_put_skb(struct sk_buff *skb)
338	{
339	struct carl9170_tx_info *arinfo = (void *)
340	(IEEE80211_SKB_CB(skb))->rate_driver_data;
341
342	return kref_put(kref: &arinfo->ref, release: carl9170_tx_release);
343	}
344
345	/* Caller must hold the tid_info->lock & rcu_read_lock */
346	static void carl9170_tx_shift_bm(struct ar9170 *ar,
347	struct carl9170_sta_tid *tid_info, u16 seq)
348	{
349	u16 off;
350
351	off = SEQ_DIFF(seq, tid_info->bsn);
352
353	if (WARN_ON_ONCE(off >= CARL9170_BAW_BITS))
354	return;
355
356	/*
357	* Sanity check. For each MPDU we set the bit in bitmap and
358	* clear it once we received the tx_status.
359	* But if the bit is already cleared then we've been bitten
360	* by a bug.
361	*/
362	WARN_ON_ONCE(!test_and_clear_bit(off, tid_info->bitmap));
363
364	off = SEQ_DIFF(tid_info->snx, tid_info->bsn);
365	if (WARN_ON_ONCE(off >= CARL9170_BAW_BITS))
366	return;
367
368	if (!bitmap_empty(src: tid_info->bitmap, nbits: off))
369	off = find_first_bit(addr: tid_info->bitmap, size: off);
370
371	tid_info->bsn += off;
372	tid_info->bsn &= 0x0fff;
373
374	bitmap_shift_right(dst: tid_info->bitmap, src: tid_info->bitmap,
375	shift: off, CARL9170_BAW_BITS);
376	}
377
378	static void carl9170_tx_status_process_ampdu(struct ar9170 *ar,
379	struct sk_buff *skb, struct ieee80211_tx_info *txinfo)
380	{
381	struct _carl9170_tx_superframe *super = (void *) skb->data;
382	struct ieee80211_hdr *hdr = (void *) super->frame_data;
383	struct ieee80211_sta *sta;
384	struct carl9170_sta_info *sta_info;
385	struct carl9170_sta_tid *tid_info;
386	u8 tid;
387
388	if (!(txinfo->flags & IEEE80211_TX_CTL_AMPDU) ||
389	txinfo->flags & IEEE80211_TX_CTL_INJECTED)
390	return;
391
392	rcu_read_lock();
393	sta = __carl9170_get_tx_sta(ar, skb);
394	if (unlikely(!sta))
395	goto out_rcu;
396
397	tid = ieee80211_get_tid(hdr);
398
399	sta_info = (void *) sta->drv_priv;
400	tid_info = rcu_dereference(sta_info->agg[tid]);
401	if (!tid_info)
402	goto out_rcu;
403
404	spin_lock_bh(lock: &tid_info->lock);
405	if (likely(tid_info->state >= CARL9170_TID_STATE_IDLE))
406	carl9170_tx_shift_bm(ar, tid_info, seq: get_seq_h(hdr));
407
408	if (sta_info->stats[tid].clear) {
409	sta_info->stats[tid].clear = false;
410	sta_info->stats[tid].req = false;
411	sta_info->stats[tid].ampdu_len = 0;
412	sta_info->stats[tid].ampdu_ack_len = 0;
413	}
414
415	sta_info->stats[tid].ampdu_len++;
416	if (txinfo->status.rates[0].count == 1)
417	sta_info->stats[tid].ampdu_ack_len++;
418
419	if (!(txinfo->flags & IEEE80211_TX_STAT_ACK))
420	sta_info->stats[tid].req = true;
421
422	if (super->f.mac_control & cpu_to_le16(AR9170_TX_MAC_IMM_BA)) {
423	super->s.rix = sta_info->stats[tid].ampdu_len;
424	super->s.cnt = sta_info->stats[tid].ampdu_ack_len;
425	txinfo->flags |= IEEE80211_TX_STAT_AMPDU;
426	if (sta_info->stats[tid].req)
427	txinfo->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
428
429	sta_info->stats[tid].clear = true;
430	}
431	spin_unlock_bh(lock: &tid_info->lock);
432
433	out_rcu:
434	rcu_read_unlock();
435	}
436
437	static void carl9170_tx_bar_status(struct ar9170 *ar, struct sk_buff *skb,
438	struct ieee80211_tx_info *tx_info)
439	{
440	struct _carl9170_tx_superframe *super = (void *) skb->data;
441	struct ieee80211_bar *bar = (void *) super->frame_data;
442
443	/*
444	* Unlike all other frames, the status report for BARs does
445	* not directly come from the hardware as it is incapable of
446	* matching a BA to a previously send BAR.
447	* Instead the RX-path will scan for incoming BAs and set the
448	* IEEE80211_TX_STAT_ACK if it sees one that was likely
449	* caused by a BAR from us.
450	*/
451
452	if (unlikely(ieee80211_is_back_req(bar->frame_control)) &&
453	!(tx_info->flags & IEEE80211_TX_STAT_ACK)) {
454	struct carl9170_bar_list_entry *entry;
455	int queue = skb_get_queue_mapping(skb);
456
457	rcu_read_lock();
458	list_for_each_entry_rcu(entry, &ar->bar_list[queue], list) {
459	if (entry->skb == skb) {
460	spin_lock_bh(lock: &ar->bar_list_lock[queue]);
461	list_del_rcu(entry: &entry->list);
462	spin_unlock_bh(lock: &ar->bar_list_lock[queue]);
463	kfree_rcu(entry, head);
464	goto out;
465	}
466	}
467
468	WARN(1, "bar not found in %d - ra:%pM ta:%pM c:%x ssn:%x\n",
469	queue, bar->ra, bar->ta, bar->control,
470	bar->start_seq_num);
471	out:
472	rcu_read_unlock();
473	}
474	}
475
476	void carl9170_tx_status(struct ar9170 *ar, struct sk_buff *skb,
477	const bool success)
478	{
479	struct ieee80211_tx_info *txinfo;
480
481	carl9170_tx_accounting_free(ar, skb);
482
483	txinfo = IEEE80211_SKB_CB(skb);
484
485	carl9170_tx_bar_status(ar, skb, tx_info: txinfo);
486
487	if (success)
488	txinfo->flags |= IEEE80211_TX_STAT_ACK;
489	else
490	ar->tx_ack_failures++;
491
492	if (txinfo->flags & IEEE80211_TX_CTL_AMPDU)
493	carl9170_tx_status_process_ampdu(ar, skb, txinfo);
494
495	carl9170_tx_ps_unblock(ar, skb);
496	carl9170_tx_put_skb(skb);
497	}
498
499	/* This function may be called form any context */
500	void carl9170_tx_callback(struct ar9170 *ar, struct sk_buff *skb)
501	{
502	struct ieee80211_tx_info *txinfo = IEEE80211_SKB_CB(skb);
503
504	atomic_dec(v: &ar->tx_total_pending);
505
506	if (txinfo->flags & IEEE80211_TX_CTL_AMPDU)
507	atomic_dec(v: &ar->tx_ampdu_upload);
508
509	if (carl9170_tx_put_skb(skb))
510	tasklet_hi_schedule(t: &ar->usb_tasklet);
511	}
512
513	static struct sk_buff *carl9170_get_queued_skb(struct ar9170 *ar, u8 cookie,
514	struct sk_buff_head *queue)
515	{
516	struct sk_buff *skb;
517
518	spin_lock_bh(lock: &queue->lock);
519	skb_queue_walk(queue, skb) {
520	struct _carl9170_tx_superframe *txc = (void *) skb->data;
521
522	if (txc->s.cookie != cookie)
523	continue;
524
525	__skb_unlink(skb, list: queue);
526	spin_unlock_bh(lock: &queue->lock);
527
528	carl9170_release_dev_space(ar, skb);
529	return skb;
530	}
531	spin_unlock_bh(lock: &queue->lock);
532
533	return NULL;
534	}
535
536	static void carl9170_tx_fill_rateinfo(struct ar9170 *ar, unsigned int rix,
537	unsigned int tries, struct ieee80211_tx_info *txinfo)
538	{
539	unsigned int i;
540
541	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
542	if (txinfo->status.rates[i].idx < 0)
543	break;
544
545	if (i == rix) {
546	txinfo->status.rates[i].count = tries;
547	i++;
548	break;
549	}
550	}
551
552	for (; i < IEEE80211_TX_MAX_RATES; i++) {
553	txinfo->status.rates[i].idx = -1;
554	txinfo->status.rates[i].count = 0;
555	}
556	}
557
558	static void carl9170_check_queue_stop_timeout(struct ar9170 *ar)
559	{
560	int i;
561	struct sk_buff *skb;
562	struct ieee80211_tx_info *txinfo;
563	struct carl9170_tx_info *arinfo;
564	bool restart = false;
565
566	for (i = 0; i < ar->hw->queues; i++) {
567	spin_lock_bh(lock: &ar->tx_status[i].lock);
568
569	skb = skb_peek(list_: &ar->tx_status[i]);
570
571	if (!skb)
572	goto next;
573
574	txinfo = IEEE80211_SKB_CB(skb);
575	arinfo = (void *) txinfo->rate_driver_data;
576
577	if (time_is_before_jiffies(arinfo->timeout +
578	msecs_to_jiffies(CARL9170_QUEUE_STUCK_TIMEOUT)) == true)
579	restart = true;
580
581	next:
582	spin_unlock_bh(lock: &ar->tx_status[i].lock);
583	}
584
585	if (restart) {
586	/*
587	* At least one queue has been stuck for long enough.
588	* Give the device a kick and hope it gets back to
589	* work.
590	*
591	* possible reasons may include:
592	* - frames got lost/corrupted (bad connection to the device)
593	* - stalled rx processing/usb controller hiccups
594	* - firmware errors/bugs
595	* - every bug you can think of.
596	* - all bugs you can't...
597	* - ...
598	*/
599	carl9170_restart(ar, r: CARL9170_RR_STUCK_TX);
600	}
601	}
602
603	static void carl9170_tx_ampdu_timeout(struct ar9170 *ar)
604	{
605	struct carl9170_sta_tid *iter;
606	struct sk_buff *skb;
607	struct ieee80211_tx_info *txinfo;
608	struct carl9170_tx_info *arinfo;
609	struct ieee80211_sta *sta;
610
611	rcu_read_lock();
612	list_for_each_entry_rcu(iter, &ar->tx_ampdu_list, list) {
613	if (iter->state < CARL9170_TID_STATE_IDLE)
614	continue;
615
616	spin_lock_bh(lock: &iter->lock);
617	skb = skb_peek(list_: &iter->queue);
618	if (!skb)
619	goto unlock;
620
621	txinfo = IEEE80211_SKB_CB(skb);
622	arinfo = (void *)txinfo->rate_driver_data;
623	if (time_is_after_jiffies(arinfo->timeout +
624	msecs_to_jiffies(CARL9170_QUEUE_TIMEOUT)))
625	goto unlock;
626
627	sta = iter->sta;
628	if (WARN_ON(!sta))
629	goto unlock;
630
631	ieee80211_stop_tx_ba_session(sta, tid: iter->tid);
632	unlock:
633	spin_unlock_bh(lock: &iter->lock);
634
635	}
636	rcu_read_unlock();
637	}
638
639	void carl9170_tx_janitor(struct work_struct *work)
640	{
641	struct ar9170 *ar = container_of(work, struct ar9170,
642	tx_janitor.work);
643	if (!IS_STARTED(ar))
644	return;
645
646	ar->tx_janitor_last_run = jiffies;
647
648	carl9170_check_queue_stop_timeout(ar);
649	carl9170_tx_ampdu_timeout(ar);
650
651	if (!atomic_read(v: &ar->tx_total_queued))
652	return;
653
654	ieee80211_queue_delayed_work(hw: ar->hw, dwork: &ar->tx_janitor,
655	delay: msecs_to_jiffies(CARL9170_TX_TIMEOUT));
656	}
657
658	static void __carl9170_tx_process_status(struct ar9170 *ar,
659	const uint8_t cookie, const uint8_t info)
660	{
661	struct sk_buff *skb;
662	struct ieee80211_tx_info *txinfo;
663	unsigned int r, t, q;
664	bool success = true;
665
666	q = ar9170_qmap(idx: info & CARL9170_TX_STATUS_QUEUE);
667
668	skb = carl9170_get_queued_skb(ar, cookie, queue: &ar->tx_status[q]);
669	if (!skb) {
670	/*
671	* We have lost the race to another thread.
672	*/
673
674	return ;
675	}
676
677	txinfo = IEEE80211_SKB_CB(skb);
678
679	if (!(info & CARL9170_TX_STATUS_SUCCESS))
680	success = false;
681
682	r = (info & CARL9170_TX_STATUS_RIX) >> CARL9170_TX_STATUS_RIX_S;
683	t = (info & CARL9170_TX_STATUS_TRIES) >> CARL9170_TX_STATUS_TRIES_S;
684
685	carl9170_tx_fill_rateinfo(ar, rix: r, tries: t, txinfo);
686	carl9170_tx_status(ar, skb, success);
687	}
688
689	void carl9170_tx_process_status(struct ar9170 *ar,
690	const struct carl9170_rsp *cmd)
691	{
692	unsigned int i;
693
694	for (i = 0; i < cmd->hdr.ext; i++) {
695	if (WARN_ON(i > ((cmd->hdr.len / 2) + 1))) {
696	print_hex_dump_bytes("UU:", DUMP_PREFIX_NONE,
697	(void *) cmd, cmd->hdr.len + 4);
698	break;
699	}
700
701	__carl9170_tx_process_status(ar, cookie: cmd->_tx_status[i].cookie,
702	info: cmd->_tx_status[i].info);
703	}
704	}
705
706	static void carl9170_tx_rate_tpc_chains(struct ar9170 *ar,
707	struct ieee80211_tx_info *info, struct ieee80211_tx_rate *txrate,
708	unsigned int *phyrate, unsigned int *tpc, unsigned int *chains)
709	{
710	struct ieee80211_rate *rate = NULL;
711	u8 *txpower;
712	unsigned int idx;
713
714	idx = txrate->idx;
715	*tpc = 0;
716	*phyrate = 0;
717
718	if (txrate->flags & IEEE80211_TX_RC_MCS) {
719	if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) {
720	/* +1 dBm for HT40 */
721	*tpc += 2;
722
723	if (info->band == NL80211_BAND_2GHZ)
724	txpower = ar->power_2G_ht40;
725	else
726	txpower = ar->power_5G_ht40;
727	} else {
728	if (info->band == NL80211_BAND_2GHZ)
729	txpower = ar->power_2G_ht20;
730	else
731	txpower = ar->power_5G_ht20;
732	}
733
734	*phyrate = txrate->idx;
735	*tpc += txpower[idx & 7];
736	} else {
737	if (info->band == NL80211_BAND_2GHZ) {
738	if (idx < 4)
739	txpower = ar->power_2G_cck;
740	else
741	txpower = ar->power_2G_ofdm;
742	} else {
743	txpower = ar->power_5G_leg;
744	idx += 4;
745	}
746
747	rate = &__carl9170_ratetable[idx];
748	*tpc += txpower[(rate->hw_value & 0x30) >> 4];
749	*phyrate = rate->hw_value & 0xf;
750	}
751
752	if (ar->eeprom.tx_mask == 1) {
753	*chains = AR9170_TX_PHY_TXCHAIN_1;
754	} else {
755	if (!(txrate->flags & IEEE80211_TX_RC_MCS) &&
756	rate && rate->bitrate >= 360)
757	*chains = AR9170_TX_PHY_TXCHAIN_1;
758	else
759	*chains = AR9170_TX_PHY_TXCHAIN_2;
760	}
761
762	*tpc = min_t(unsigned int, *tpc, ar->hw->conf.power_level * 2);
763	}
764
765	static __le32 carl9170_tx_physet(struct ar9170 *ar,
766	struct ieee80211_tx_info *info, struct ieee80211_tx_rate *txrate)
767	{
768	unsigned int power = 0, chains = 0, phyrate = 0;
769	__le32 tmp;
770
771	tmp = cpu_to_le32(0);
772
773	if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
774	tmp |= cpu_to_le32(AR9170_TX_PHY_BW_40MHZ <<
775	AR9170_TX_PHY_BW_S);
776	/* this works because 40 MHz is 2 and dup is 3 */
777	if (txrate->flags & IEEE80211_TX_RC_DUP_DATA)
778	tmp |= cpu_to_le32(AR9170_TX_PHY_BW_40MHZ_DUP <<
779	AR9170_TX_PHY_BW_S);
780
781	if (txrate->flags & IEEE80211_TX_RC_SHORT_GI)
782	tmp |= cpu_to_le32(AR9170_TX_PHY_SHORT_GI);
783
784	if (txrate->flags & IEEE80211_TX_RC_MCS) {
785	SET_VAL(AR9170_TX_PHY_MCS, phyrate, txrate->idx);
786
787	/* heavy clip control */
788	tmp |= cpu_to_le32((txrate->idx & 0x7) <<
789	AR9170_TX_PHY_TX_HEAVY_CLIP_S);
790
791	tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_HT);
792
793	/*
794	* green field preamble does not work.
795	*
796	* if (txrate->flags & IEEE80211_TX_RC_GREEN_FIELD)
797	* tmp |= cpu_to_le32(AR9170_TX_PHY_GREENFIELD);
798	*/
799	} else {
800	if (info->band == NL80211_BAND_2GHZ) {
801	if (txrate->idx <= AR9170_TX_PHY_RATE_CCK_11M)
802	tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_CCK);
803	else
804	tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_OFDM);
805	} else {
806	tmp |= cpu_to_le32(AR9170_TX_PHY_MOD_OFDM);
807	}
808
809	/*
810	* short preamble seems to be broken too.
811	*
812	* if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
813	* tmp |= cpu_to_le32(AR9170_TX_PHY_SHORT_PREAMBLE);
814	*/
815	}
816	carl9170_tx_rate_tpc_chains(ar, info, txrate,
817	phyrate: &phyrate, tpc: &power, chains: &chains);
818
819	tmp |= cpu_to_le32(SET_CONSTVAL(AR9170_TX_PHY_MCS, phyrate));
820	tmp |= cpu_to_le32(SET_CONSTVAL(AR9170_TX_PHY_TX_PWR, power));
821	tmp |= cpu_to_le32(SET_CONSTVAL(AR9170_TX_PHY_TXCHAIN, chains));
822	return tmp;
823	}
824
825	static bool carl9170_tx_rts_check(struct ar9170 *ar,
826	struct ieee80211_tx_rate *rate,
827	bool ampdu, bool multi)
828	{
829	switch (ar->erp_mode) {
830	case CARL9170_ERP_AUTO:
831	if (ampdu)
832	break;
833	fallthrough;
834
835	case CARL9170_ERP_MAC80211:
836	if (!(rate->flags & IEEE80211_TX_RC_USE_RTS_CTS))
837	break;
838	fallthrough;
839
840	case CARL9170_ERP_RTS:
841	if (likely(!multi))
842	return true;
843	break;
844
845	default:
846	break;
847	}
848
849	return false;
850	}
851
852	static bool carl9170_tx_cts_check(struct ar9170 *ar,
853	struct ieee80211_tx_rate *rate)
854	{
855	switch (ar->erp_mode) {
856	case CARL9170_ERP_AUTO:
857	case CARL9170_ERP_MAC80211:
858	if (!(rate->flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
859	break;
860	fallthrough;
861
862	case CARL9170_ERP_CTS:
863	return true;
864
865	default:
866	break;
867	}
868
869	return false;
870	}
871
872	static void carl9170_tx_get_rates(struct ar9170 *ar,
873	struct ieee80211_vif *vif,
874	struct ieee80211_sta *sta,
875	struct sk_buff *skb)
876	{
877	struct ieee80211_tx_info *info;
878
879	BUILD_BUG_ON(IEEE80211_TX_MAX_RATES < CARL9170_TX_MAX_RATES);
880	BUILD_BUG_ON(IEEE80211_TX_MAX_RATES > IEEE80211_TX_RATE_TABLE_SIZE);
881
882	info = IEEE80211_SKB_CB(skb);
883
884	ieee80211_get_tx_rates(vif, sta, skb,
885	dest: info->control.rates,
886	IEEE80211_TX_MAX_RATES);
887	}
888
889	static void carl9170_tx_apply_rateset(struct ar9170 *ar,
890	struct ieee80211_tx_info *sinfo,
891	struct sk_buff *skb)
892	{
893	struct ieee80211_tx_rate *txrate;
894	struct ieee80211_tx_info *info;
895	struct _carl9170_tx_superframe *txc = (void *) skb->data;
896	int i;
897	bool ampdu;
898	bool no_ack;
899
900	info = IEEE80211_SKB_CB(skb);
901	ampdu = !!(info->flags & IEEE80211_TX_CTL_AMPDU);
902	no_ack = !!(info->flags & IEEE80211_TX_CTL_NO_ACK);
903
904	/* Set the rate control probe flag for all (sub-) frames.
905	* This is because the TX_STATS_AMPDU flag is only set on
906	* the last frame, so it has to be inherited.
907	*/
908	info->flags |= (sinfo->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE);
909
910	/* NOTE: For the first rate, the ERP & AMPDU flags are directly
911	* taken from mac_control. For all fallback rate, the firmware
912	* updates the mac_control flags from the rate info field.
913	*/
914	for (i = 0; i < CARL9170_TX_MAX_RATES; i++) {
915	__le32 phy_set;
916
917	txrate = &sinfo->control.rates[i];
918	if (txrate->idx < 0)
919	break;
920
921	phy_set = carl9170_tx_physet(ar, info, txrate);
922	if (i == 0) {
923	__le16 mac_tmp = cpu_to_le16(0);
924
925	/* first rate - part of the hw's frame header */
926	txc->f.phy_control = phy_set;
927
928	if (ampdu && txrate->flags & IEEE80211_TX_RC_MCS)
929	mac_tmp |= cpu_to_le16(AR9170_TX_MAC_AGGR);
930
931	if (carl9170_tx_rts_check(ar, rate: txrate, ampdu, multi: no_ack))
932	mac_tmp |= cpu_to_le16(AR9170_TX_MAC_PROT_RTS);
933	else if (carl9170_tx_cts_check(ar, rate: txrate))
934	mac_tmp |= cpu_to_le16(AR9170_TX_MAC_PROT_CTS);
935
936	txc->f.mac_control |= mac_tmp;
937	} else {
938	/* fallback rates are stored in the firmware's
939	* retry rate set array.
940	*/
941	txc->s.rr[i - 1] = phy_set;
942	}
943
944	SET_VAL(CARL9170_TX_SUPER_RI_TRIES, txc->s.ri[i],
945	txrate->count);
946
947	if (carl9170_tx_rts_check(ar, rate: txrate, ampdu, multi: no_ack))
948	txc->s.ri[i] |= (AR9170_TX_MAC_PROT_RTS <<
949	CARL9170_TX_SUPER_RI_ERP_PROT_S);
950	else if (carl9170_tx_cts_check(ar, rate: txrate))
951	txc->s.ri[i] |= (AR9170_TX_MAC_PROT_CTS <<
952	CARL9170_TX_SUPER_RI_ERP_PROT_S);
953
954	if (ampdu && (txrate->flags & IEEE80211_TX_RC_MCS))
955	txc->s.ri[i] |= CARL9170_TX_SUPER_RI_AMPDU;
956	}
957	}
958
959	static int carl9170_tx_prepare(struct ar9170 *ar,
960	struct ieee80211_sta *sta,
961	struct sk_buff *skb)
962	{
963	struct ieee80211_hdr *hdr;
964	struct _carl9170_tx_superframe *txc;
965	struct carl9170_vif_info *cvif;
966	struct ieee80211_tx_info *info;
967	struct carl9170_tx_info *arinfo;
968	unsigned int hw_queue;
969	__le16 mac_tmp;
970	u16 len;
971
972	BUILD_BUG_ON(sizeof(*arinfo) > sizeof(info->rate_driver_data));
973	BUILD_BUG_ON(sizeof(struct _carl9170_tx_superdesc) !=
974	CARL9170_TX_SUPERDESC_LEN);
975
976	BUILD_BUG_ON(sizeof(struct _ar9170_tx_hwdesc) !=
977	AR9170_TX_HWDESC_LEN);
978
979	BUILD_BUG_ON(AR9170_MAX_VIRTUAL_MAC >
980	((CARL9170_TX_SUPER_MISC_VIF_ID >>
981	CARL9170_TX_SUPER_MISC_VIF_ID_S) + 1));
982
983	hw_queue = ar9170_qmap(idx: carl9170_get_queue(ar, skb));
984
985	hdr = (void *)skb->data;
986	info = IEEE80211_SKB_CB(skb);
987	len = skb->len;
988
989	/*
990	* Note: If the frame was sent through a monitor interface,
991	* the ieee80211_vif pointer can be NULL.
992	*/
993	if (likely(info->control.vif))
994	cvif = (void *) info->control.vif->drv_priv;
995	else
996	cvif = NULL;
997
998	txc = skb_push(skb, len: sizeof(*txc));
999	memset(txc, 0, sizeof(*txc));
1000
1001	SET_VAL(CARL9170_TX_SUPER_MISC_QUEUE, txc->s.misc, hw_queue);
1002
1003	if (likely(cvif))
1004	SET_VAL(CARL9170_TX_SUPER_MISC_VIF_ID, txc->s.misc, cvif->id);
1005
1006	if (unlikely(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM))
1007	txc->s.misc |= CARL9170_TX_SUPER_MISC_CAB;
1008
1009	if (unlikely(info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ))
1010	txc->s.misc |= CARL9170_TX_SUPER_MISC_ASSIGN_SEQ;
1011
1012	if (unlikely(ieee80211_is_probe_resp(hdr->frame_control)))
1013	txc->s.misc |= CARL9170_TX_SUPER_MISC_FILL_IN_TSF;
1014
1015	mac_tmp = cpu_to_le16(AR9170_TX_MAC_HW_DURATION |
1016	AR9170_TX_MAC_BACKOFF);
1017	mac_tmp |= cpu_to_le16((hw_queue << AR9170_TX_MAC_QOS_S) &
1018	AR9170_TX_MAC_QOS);
1019
1020	if (unlikely(info->flags & IEEE80211_TX_CTL_NO_ACK))
1021	mac_tmp |= cpu_to_le16(AR9170_TX_MAC_NO_ACK);
1022
1023	if (info->control.hw_key) {
1024	len += info->control.hw_key->icv_len;
1025
1026	switch (info->control.hw_key->cipher) {
1027	case WLAN_CIPHER_SUITE_WEP40:
1028	case WLAN_CIPHER_SUITE_WEP104:
1029	case WLAN_CIPHER_SUITE_TKIP:
1030	mac_tmp |= cpu_to_le16(AR9170_TX_MAC_ENCR_RC4);
1031	break;
1032	case WLAN_CIPHER_SUITE_CCMP:
1033	mac_tmp |= cpu_to_le16(AR9170_TX_MAC_ENCR_AES);
1034	break;
1035	default:
1036	WARN_ON(1);
1037	goto err_out;
1038	}
1039	}
1040
1041	if (info->flags & IEEE80211_TX_CTL_AMPDU) {
1042	unsigned int density, factor;
1043
1044	if (unlikely(!sta || !cvif))
1045	goto err_out;
1046
1047	factor = min_t(unsigned int, 1u,
1048	sta->deflink.ht_cap.ampdu_factor);
1049	density = sta->deflink.ht_cap.ampdu_density;
1050
1051	if (density) {
1052	/*
1053	* Watch out!
1054	*
1055	* Otus uses slightly different density values than
1056	* those from the 802.11n spec.
1057	*/
1058
1059	density = max_t(unsigned int, density + 1, 7u);
1060	}
1061
1062	SET_VAL(CARL9170_TX_SUPER_AMPDU_DENSITY,
1063	txc->s.ampdu_settings, density);
1064
1065	SET_VAL(CARL9170_TX_SUPER_AMPDU_FACTOR,
1066	txc->s.ampdu_settings, factor);
1067	}
1068
1069	txc->s.len = cpu_to_le16(skb->len);
1070	txc->f.length = cpu_to_le16(len + FCS_LEN);
1071	txc->f.mac_control = mac_tmp;
1072
1073	arinfo = (void *)info->rate_driver_data;
1074	arinfo->timeout = jiffies;
1075	arinfo->ar = ar;
1076	kref_init(kref: &arinfo->ref);
1077	return 0;
1078
1079	err_out:
1080	skb_pull(skb, len: sizeof(*txc));
1081	return -EINVAL;
1082	}
1083
1084	static void carl9170_set_immba(struct ar9170 *ar, struct sk_buff *skb)
1085	{
1086	struct _carl9170_tx_superframe *super;
1087
1088	super = (void *) skb->data;
1089	super->f.mac_control |= cpu_to_le16(AR9170_TX_MAC_IMM_BA);
1090	}
1091
1092	static void carl9170_set_ampdu_params(struct ar9170 *ar, struct sk_buff *skb)
1093	{
1094	struct _carl9170_tx_superframe *super;
1095	int tmp;
1096
1097	super = (void *) skb->data;
1098
1099	tmp = (super->s.ampdu_settings & CARL9170_TX_SUPER_AMPDU_DENSITY) <<
1100	CARL9170_TX_SUPER_AMPDU_DENSITY_S;
1101
1102	/*
1103	* If you haven't noticed carl9170_tx_prepare has already filled
1104	* in all ampdu spacing & factor parameters.
1105	* Now it's the time to check whenever the settings have to be
1106	* updated by the firmware, or if everything is still the same.
1107	*
1108	* There's no sane way to handle different density values with
1109	* this hardware, so we may as well just do the compare in the
1110	* driver.
1111	*/
1112
1113	if (tmp != ar->current_density) {
1114	ar->current_density = tmp;
1115	super->s.ampdu_settings |=
1116	CARL9170_TX_SUPER_AMPDU_COMMIT_DENSITY;
1117	}
1118
1119	tmp = (super->s.ampdu_settings & CARL9170_TX_SUPER_AMPDU_FACTOR) <<
1120	CARL9170_TX_SUPER_AMPDU_FACTOR_S;
1121
1122	if (tmp != ar->current_factor) {
1123	ar->current_factor = tmp;
1124	super->s.ampdu_settings |=
1125	CARL9170_TX_SUPER_AMPDU_COMMIT_FACTOR;
1126	}
1127	}
1128
1129	static void carl9170_tx_ampdu(struct ar9170 *ar)
1130	{
1131	struct sk_buff_head agg;
1132	struct carl9170_sta_tid *tid_info;
1133	struct sk_buff *skb, *first;
1134	struct ieee80211_tx_info *tx_info_first;
1135	unsigned int i = 0, done_ampdus = 0;
1136	u16 seq, queue, tmpssn;
1137
1138	atomic_inc(v: &ar->tx_ampdu_scheduler);
1139	ar->tx_ampdu_schedule = false;
1140
1141	if (atomic_read(v: &ar->tx_ampdu_upload))
1142	return;
1143
1144	if (!ar->tx_ampdu_list_len)
1145	return;
1146
1147	__skb_queue_head_init(list: &agg);
1148
1149	rcu_read_lock();
1150	tid_info = rcu_dereference(ar->tx_ampdu_iter);
1151	if (WARN_ON_ONCE(!tid_info)) {
1152	rcu_read_unlock();
1153	return;
1154	}
1155
1156	retry:
1157	list_for_each_entry_continue_rcu(tid_info, &ar->tx_ampdu_list, list) {
1158	i++;
1159
1160	if (tid_info->state < CARL9170_TID_STATE_PROGRESS)
1161	continue;
1162
1163	queue = TID_TO_WME_AC(tid_info->tid);
1164
1165	spin_lock_bh(lock: &tid_info->lock);
1166	if (tid_info->state != CARL9170_TID_STATE_XMIT)
1167	goto processed;
1168
1169	tid_info->counter++;
1170	first = skb_peek(list_: &tid_info->queue);
1171	tmpssn = carl9170_get_seq(skb: first);
1172	seq = tid_info->snx;
1173
1174	if (unlikely(tmpssn != seq)) {
1175	tid_info->state = CARL9170_TID_STATE_IDLE;
1176
1177	goto processed;
1178	}
1179
1180	tx_info_first = NULL;
1181	while ((skb = skb_peek(list_: &tid_info->queue))) {
1182	/* strict 0, 1, ..., n - 1, n frame sequence order */
1183	if (unlikely(carl9170_get_seq(skb) != seq))
1184	break;
1185
1186	/* don't upload more than AMPDU FACTOR allows. */
1187	if (unlikely(SEQ_DIFF(tid_info->snx, tid_info->bsn) >=
1188	(tid_info->max - 1)))
1189	break;
1190
1191	if (!tx_info_first) {
1192	carl9170_tx_get_rates(ar, vif: tid_info->vif,
1193	sta: tid_info->sta, skb: first);
1194	tx_info_first = IEEE80211_SKB_CB(skb: first);
1195	}
1196
1197	carl9170_tx_apply_rateset(ar, sinfo: tx_info_first, skb);
1198
1199	atomic_inc(v: &ar->tx_ampdu_upload);
1200	tid_info->snx = seq = SEQ_NEXT(seq);
1201	__skb_unlink(skb, list: &tid_info->queue);
1202
1203	__skb_queue_tail(list: &agg, newsk: skb);
1204
1205	if (skb_queue_len(list_: &agg) >= CARL9170_NUM_TX_AGG_MAX)
1206	break;
1207	}
1208
1209	if (skb_queue_empty(list: &tid_info->queue) ||
1210	carl9170_get_seq(skb: skb_peek(list_: &tid_info->queue)) !=
1211	tid_info->snx) {
1212	/* stop TID, if A-MPDU frames are still missing,
1213	* or whenever the queue is empty.
1214	*/
1215
1216	tid_info->state = CARL9170_TID_STATE_IDLE;
1217	}
1218	done_ampdus++;
1219
1220	processed:
1221	spin_unlock_bh(lock: &tid_info->lock);
1222
1223	if (skb_queue_empty(list: &agg))
1224	continue;
1225
1226	/* apply ampdu spacing & factor settings */
1227	carl9170_set_ampdu_params(ar, skb: skb_peek(list_: &agg));
1228
1229	/* set aggregation push bit */
1230	carl9170_set_immba(ar, skb: skb_peek_tail(list_: &agg));
1231
1232	spin_lock_bh(lock: &ar->tx_pending[queue].lock);
1233	skb_queue_splice_tail_init(list: &agg, head: &ar->tx_pending[queue]);
1234	spin_unlock_bh(lock: &ar->tx_pending[queue].lock);
1235	ar->tx_schedule = true;
1236	}
1237	if ((done_ampdus++ == 0) && (i++ == 0))
1238	goto retry;
1239
1240	rcu_assign_pointer(ar->tx_ampdu_iter, tid_info);
1241	rcu_read_unlock();
1242	}
1243
1244	static struct sk_buff *carl9170_tx_pick_skb(struct ar9170 *ar,
1245	struct sk_buff_head *queue)
1246	{
1247	struct sk_buff *skb;
1248	struct ieee80211_tx_info *info;
1249	struct carl9170_tx_info *arinfo;
1250
1251	BUILD_BUG_ON(sizeof(*arinfo) > sizeof(info->rate_driver_data));
1252
1253	spin_lock_bh(lock: &queue->lock);
1254	skb = skb_peek(list_: queue);
1255	if (unlikely(!skb))
1256	goto err_unlock;
1257
1258	if (carl9170_alloc_dev_space(ar, skb))
1259	goto err_unlock;
1260
1261	__skb_unlink(skb, list: queue);
1262	spin_unlock_bh(lock: &queue->lock);
1263
1264	info = IEEE80211_SKB_CB(skb);
1265	arinfo = (void *) info->rate_driver_data;
1266
1267	arinfo->timeout = jiffies;
1268	return skb;
1269
1270	err_unlock:
1271	spin_unlock_bh(lock: &queue->lock);
1272	return NULL;
1273	}
1274
1275	void carl9170_tx_drop(struct ar9170 *ar, struct sk_buff *skb)
1276	{
1277	struct _carl9170_tx_superframe *super;
1278	uint8_t q = 0;
1279
1280	ar->tx_dropped++;
1281
1282	super = (void *)skb->data;
1283	SET_VAL(CARL9170_TX_SUPER_MISC_QUEUE, q,
1284	ar9170_qmap(carl9170_get_queue(ar, skb)));
1285	__carl9170_tx_process_status(ar, cookie: super->s.cookie, info: q);
1286	}
1287
1288	static bool carl9170_tx_ps_drop(struct ar9170 *ar, struct sk_buff *skb)
1289	{
1290	struct ieee80211_sta *sta;
1291	struct carl9170_sta_info *sta_info;
1292	struct ieee80211_tx_info *tx_info;
1293
1294	rcu_read_lock();
1295	sta = __carl9170_get_tx_sta(ar, skb);
1296	if (!sta)
1297	goto out_rcu;
1298
1299	sta_info = (void *) sta->drv_priv;
1300	tx_info = IEEE80211_SKB_CB(skb);
1301
1302	if (unlikely(sta_info->sleeping) &&
1303	!(tx_info->flags & (IEEE80211_TX_CTL_NO_PS_BUFFER |
1304	IEEE80211_TX_CTL_CLEAR_PS_FILT))) {
1305	rcu_read_unlock();
1306
1307	if (tx_info->flags & IEEE80211_TX_CTL_AMPDU)
1308	atomic_dec(v: &ar->tx_ampdu_upload);
1309
1310	tx_info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
1311	carl9170_release_dev_space(ar, skb);
1312	carl9170_tx_status(ar, skb, success: false);
1313	return true;
1314	}
1315
1316	out_rcu:
1317	rcu_read_unlock();
1318	return false;
1319	}
1320
1321	static void carl9170_bar_check(struct ar9170 *ar, struct sk_buff *skb)
1322	{
1323	struct _carl9170_tx_superframe *super = (void *) skb->data;
1324	struct ieee80211_bar *bar = (void *) super->frame_data;
1325
1326	if (unlikely(ieee80211_is_back_req(bar->frame_control)) &&
1327	skb->len >= sizeof(struct ieee80211_bar)) {
1328	struct carl9170_bar_list_entry *entry;
1329	unsigned int queue = skb_get_queue_mapping(skb);
1330
1331	entry = kmalloc(size: sizeof(*entry), GFP_ATOMIC);
1332	if (!WARN_ON_ONCE(!entry)) {
1333	entry->skb = skb;
1334	spin_lock_bh(lock: &ar->bar_list_lock[queue]);
1335	list_add_tail_rcu(new: &entry->list, head: &ar->bar_list[queue]);
1336	spin_unlock_bh(lock: &ar->bar_list_lock[queue]);
1337	}
1338	}
1339	}
1340
1341	static void carl9170_tx(struct ar9170 *ar)
1342	{
1343	struct sk_buff *skb;
1344	unsigned int i, q;
1345	bool schedule_garbagecollector = false;
1346
1347	ar->tx_schedule = false;
1348
1349	if (unlikely(!IS_STARTED(ar)))
1350	return;
1351
1352	carl9170_usb_handle_tx_err(ar);
1353
1354	for (i = 0; i < ar->hw->queues; i++) {
1355	while (!skb_queue_empty(list: &ar->tx_pending[i])) {
1356	skb = carl9170_tx_pick_skb(ar, queue: &ar->tx_pending[i]);
1357	if (unlikely(!skb))
1358	break;
1359
1360	if (unlikely(carl9170_tx_ps_drop(ar, skb)))
1361	continue;
1362
1363	carl9170_bar_check(ar, skb);
1364
1365	atomic_inc(v: &ar->tx_total_pending);
1366
1367	q = __carl9170_get_queue(ar, queue: i);
1368	/*
1369	* NB: tx_status[i] vs. tx_status[q],
1370	* TODO: Move into pick_skb or alloc_dev_space.
1371	*/
1372	skb_queue_tail(list: &ar->tx_status[q], newsk: skb);
1373
1374	/*
1375	* increase ref count to "2".
1376	* Ref counting is the easiest way to solve the
1377	* race between the urb's completion routine:
1378	* carl9170_tx_callback
1379	* and wlan tx status functions:
1380	* carl9170_tx_status/janitor.
1381	*/
1382	carl9170_tx_get_skb(skb);
1383
1384	carl9170_usb_tx(ar, skb);
1385	schedule_garbagecollector = true;
1386	}
1387	}
1388
1389	if (!schedule_garbagecollector)
1390	return;
1391
1392	ieee80211_queue_delayed_work(hw: ar->hw, dwork: &ar->tx_janitor,
1393	delay: msecs_to_jiffies(CARL9170_TX_TIMEOUT));
1394	}
1395
1396	static bool carl9170_tx_ampdu_queue(struct ar9170 *ar,
1397	struct ieee80211_sta *sta, struct sk_buff *skb,
1398	struct ieee80211_tx_info *txinfo)
1399	{
1400	struct carl9170_sta_info *sta_info;
1401	struct carl9170_sta_tid *agg;
1402	struct sk_buff *iter;
1403	u16 tid, seq, qseq, off;
1404	bool run = false;
1405
1406	tid = carl9170_get_tid(skb);
1407	seq = carl9170_get_seq(skb);
1408	sta_info = (void *) sta->drv_priv;
1409
1410	rcu_read_lock();
1411	agg = rcu_dereference(sta_info->agg[tid]);
1412
1413	if (!agg)
1414	goto err_unlock_rcu;
1415
1416	spin_lock_bh(lock: &agg->lock);
1417	if (unlikely(agg->state < CARL9170_TID_STATE_IDLE))
1418	goto err_unlock;
1419
1420	/* check if sequence is within the BA window */
1421	if (unlikely(!BAW_WITHIN(agg->bsn, CARL9170_BAW_BITS, seq)))
1422	goto err_unlock;
1423
1424	if (WARN_ON_ONCE(!BAW_WITHIN(agg->snx, CARL9170_BAW_BITS, seq)))
1425	goto err_unlock;
1426
1427	off = SEQ_DIFF(seq, agg->bsn);
1428	if (WARN_ON_ONCE(test_and_set_bit(off, agg->bitmap)))
1429	goto err_unlock;
1430
1431	if (likely(BAW_WITHIN(agg->hsn, CARL9170_BAW_BITS, seq))) {
1432	__skb_queue_tail(list: &agg->queue, newsk: skb);
1433	agg->hsn = seq;
1434	goto queued;
1435	}
1436
1437	skb_queue_reverse_walk(&agg->queue, iter) {
1438	qseq = carl9170_get_seq(skb: iter);
1439
1440	if (BAW_WITHIN(qseq, CARL9170_BAW_BITS, seq)) {
1441	__skb_queue_after(list: &agg->queue, prev: iter, newsk: skb);
1442	goto queued;
1443	}
1444	}
1445
1446	__skb_queue_head(list: &agg->queue, newsk: skb);
1447	queued:
1448
1449	if (unlikely(agg->state != CARL9170_TID_STATE_XMIT)) {
1450	if (agg->snx == carl9170_get_seq(skb: skb_peek(list_: &agg->queue))) {
1451	agg->state = CARL9170_TID_STATE_XMIT;
1452	run = true;
1453	}
1454	}
1455
1456	spin_unlock_bh(lock: &agg->lock);
1457	rcu_read_unlock();
1458
1459	return run;
1460
1461	err_unlock:
1462	spin_unlock_bh(lock: &agg->lock);
1463
1464	err_unlock_rcu:
1465	rcu_read_unlock();
1466	txinfo->flags &= ~IEEE80211_TX_CTL_AMPDU;
1467	carl9170_tx_status(ar, skb, success: false);
1468	ar->tx_dropped++;
1469	return false;
1470	}
1471
1472	void carl9170_op_tx(struct ieee80211_hw *hw,
1473	struct ieee80211_tx_control *control,
1474	struct sk_buff *skb)
1475	{
1476	struct ar9170 *ar = hw->priv;
1477	struct ieee80211_tx_info *info;
1478	struct ieee80211_sta *sta = control->sta;
1479	struct ieee80211_vif *vif;
1480	bool run;
1481
1482	if (unlikely(!IS_STARTED(ar)))
1483	goto err_free;
1484
1485	info = IEEE80211_SKB_CB(skb);
1486	vif = info->control.vif;
1487
1488	if (unlikely(carl9170_tx_prepare(ar, sta, skb)))
1489	goto err_free;
1490
1491	carl9170_tx_accounting(ar, skb);
1492	/*
1493	* from now on, one has to use carl9170_tx_status to free
1494	* all ressouces which are associated with the frame.
1495	*/
1496
1497	if (sta) {
1498	struct carl9170_sta_info *stai = (void *) sta->drv_priv;
1499	atomic_inc(v: &stai->pending_frames);
1500	}
1501
1502	if (info->flags & IEEE80211_TX_CTL_AMPDU) {
1503	/* to static code analyzers and reviewers:
1504	* mac80211 guarantees that a valid "sta"
1505	* reference is present, if a frame is to
1506	* be part of an ampdu. Hence any extra
1507	* sta == NULL checks are redundant in this
1508	* special case.
1509	*/
1510	run = carl9170_tx_ampdu_queue(ar, sta, skb, txinfo: info);
1511	if (run)
1512	carl9170_tx_ampdu(ar);
1513
1514	} else {
1515	unsigned int queue = skb_get_queue_mapping(skb);
1516
1517	carl9170_tx_get_rates(ar, vif, sta, skb);
1518	carl9170_tx_apply_rateset(ar, sinfo: info, skb);
1519	skb_queue_tail(list: &ar->tx_pending[queue], newsk: skb);
1520	}
1521
1522	carl9170_tx(ar);
1523	return;
1524
1525	err_free:
1526	ar->tx_dropped++;
1527	ieee80211_free_txskb(hw: ar->hw, skb);
1528	}
1529
1530	void carl9170_tx_scheduler(struct ar9170 *ar)
1531	{
1532
1533	if (ar->tx_ampdu_schedule)
1534	carl9170_tx_ampdu(ar);
1535
1536	if (ar->tx_schedule)
1537	carl9170_tx(ar);
1538	}
1539
1540	/* caller has to take rcu_read_lock */
1541	static struct carl9170_vif_info *carl9170_pick_beaconing_vif(struct ar9170 *ar)
1542	{
1543	struct carl9170_vif_info *cvif;
1544	int i = 1;
1545
1546	/* The AR9170 hardware has no fancy beacon queue or some
1547	* other scheduling mechanism. So, the driver has to make
1548	* due by setting the two beacon timers (pretbtt and tbtt)
1549	* once and then swapping the beacon address in the HW's
1550	* register file each time the pretbtt fires.
1551	*/
1552
1553	cvif = rcu_dereference(ar->beacon_iter);
1554	if (ar->vifs > 0 && cvif) {
1555	do {
1556	list_for_each_entry_continue_rcu(cvif, &ar->vif_list,
1557	list) {
1558	if (cvif->active && cvif->enable_beacon)
1559	goto out;
1560	}
1561	} while (ar->beacon_enabled && i--);
1562
1563	/* no entry found in list */
1564	return NULL;
1565	}
1566
1567	out:
1568	RCU_INIT_POINTER(ar->beacon_iter, cvif);
1569	return cvif;
1570	}
1571
1572	static bool carl9170_tx_beacon_physet(struct ar9170 *ar, struct sk_buff *skb,
1573	u32 *ht1, u32 *plcp)
1574	{
1575	struct ieee80211_tx_info *txinfo;
1576	struct ieee80211_tx_rate *rate;
1577	unsigned int power, chains;
1578	bool ht_rate;
1579
1580	txinfo = IEEE80211_SKB_CB(skb);
1581	rate = &txinfo->control.rates[0];
1582	ht_rate = !!(txinfo->control.rates[0].flags & IEEE80211_TX_RC_MCS);
1583	carl9170_tx_rate_tpc_chains(ar, info: txinfo, txrate: rate, phyrate: plcp, tpc: &power, chains: &chains);
1584
1585	*ht1 = AR9170_MAC_BCN_HT1_TX_ANT0;
1586	if (chains == AR9170_TX_PHY_TXCHAIN_2)
1587	*ht1 |= AR9170_MAC_BCN_HT1_TX_ANT1;
1588	SET_VAL(AR9170_MAC_BCN_HT1_PWR_CTRL, *ht1, 7);
1589	SET_VAL(AR9170_MAC_BCN_HT1_TPC, *ht1, power);
1590	SET_VAL(AR9170_MAC_BCN_HT1_CHAIN_MASK, *ht1, chains);
1591
1592	if (ht_rate) {
1593	*ht1 |= AR9170_MAC_BCN_HT1_HT_EN;
1594	if (rate->flags & IEEE80211_TX_RC_SHORT_GI)
1595	*plcp |= AR9170_MAC_BCN_HT2_SGI;
1596
1597	if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) {
1598	*ht1 |= AR9170_MAC_BCN_HT1_BWC_40M_SHARED;
1599	*plcp |= AR9170_MAC_BCN_HT2_BW40;
1600	} else if (rate->flags & IEEE80211_TX_RC_DUP_DATA) {
1601	*ht1 |= AR9170_MAC_BCN_HT1_BWC_40M_DUP;
1602	*plcp |= AR9170_MAC_BCN_HT2_BW40;
1603	}
1604
1605	SET_VAL(AR9170_MAC_BCN_HT2_LEN, *plcp, skb->len + FCS_LEN);
1606	} else {
1607	if (*plcp <= AR9170_TX_PHY_RATE_CCK_11M)
1608	*plcp |= ((skb->len + FCS_LEN) << (3 + 16)) + 0x0400;
1609	else
1610	*plcp |= ((skb->len + FCS_LEN) << 16) + 0x0010;
1611	}
1612
1613	return ht_rate;
1614	}
1615
1616	int carl9170_update_beacon(struct ar9170 *ar, const bool submit)
1617	{
1618	struct sk_buff *skb = NULL;
1619	struct carl9170_vif_info *cvif;
1620	__le32 *data, *old = NULL;
1621	u32 word, ht1, plcp, off, addr, len;
1622	int i = 0, err = 0;
1623	bool ht_rate;
1624
1625	rcu_read_lock();
1626	cvif = carl9170_pick_beaconing_vif(ar);
1627	if (!cvif)
1628	goto out_unlock;
1629
1630	skb = ieee80211_beacon_get_tim(hw: ar->hw, vif: carl9170_get_vif(priv: cvif),
1631	NULL, NULL, link_id: 0);
1632
1633	if (!skb) {
1634	err = -ENOMEM;
1635	goto err_free;
1636	}
1637
1638	spin_lock_bh(lock: &ar->beacon_lock);
1639	data = (__le32 *)skb->data;
1640	if (cvif->beacon)
1641	old = (__le32 *)cvif->beacon->data;
1642
1643	off = cvif->id * AR9170_MAC_BCN_LENGTH_MAX;
1644	addr = ar->fw.beacon_addr + off;
1645	len = roundup(skb->len + FCS_LEN, 4);
1646
1647	if ((off + len) > ar->fw.beacon_max_len) {
1648	if (net_ratelimit()) {
1649	wiphy_err(ar->hw->wiphy, "beacon does not "
1650	"fit into device memory!\n");
1651	}
1652	err = -EINVAL;
1653	goto err_unlock;
1654	}
1655
1656	if (len > AR9170_MAC_BCN_LENGTH_MAX) {
1657	if (net_ratelimit()) {
1658	wiphy_err(ar->hw->wiphy, "no support for beacons "
1659	"bigger than %d (yours:%d).\n",
1660	AR9170_MAC_BCN_LENGTH_MAX, len);
1661	}
1662
1663	err = -EMSGSIZE;
1664	goto err_unlock;
1665	}
1666
1667	ht_rate = carl9170_tx_beacon_physet(ar, skb, ht1: &ht1, plcp: &plcp);
1668
1669	carl9170_async_regwrite_begin(ar);
1670	carl9170_async_regwrite(AR9170_MAC_REG_BCN_HT1, ht1);
1671	if (ht_rate)
1672	carl9170_async_regwrite(AR9170_MAC_REG_BCN_HT2, plcp);
1673	else
1674	carl9170_async_regwrite(AR9170_MAC_REG_BCN_PLCP, plcp);
1675
1676	for (i = 0; i < DIV_ROUND_UP(skb->len, 4); i++) {
1677	/*
1678	* XXX: This accesses beyond skb data for up
1679	* to the last 3 bytes!!
1680	*/
1681
1682	if (old && (data[i] == old[i]))
1683	continue;
1684
1685	word = le32_to_cpu(data[i]);
1686	carl9170_async_regwrite(addr + 4 * i, word);
1687	}
1688	carl9170_async_regwrite_finish();
1689
1690	dev_kfree_skb_any(skb: cvif->beacon);
1691	cvif->beacon = NULL;
1692
1693	err = carl9170_async_regwrite_result();
1694	if (!err)
1695	cvif->beacon = skb;
1696	spin_unlock_bh(lock: &ar->beacon_lock);
1697	if (err)
1698	goto err_free;
1699
1700	if (submit) {
1701	err = carl9170_bcn_ctrl(ar, vif_id: cvif->id,
1702	CARL9170_BCN_CTRL_CAB_TRIGGER,
1703	addr, len: skb->len + FCS_LEN);
1704
1705	if (err)
1706	goto err_free;
1707	}
1708	out_unlock:
1709	rcu_read_unlock();
1710	return 0;
1711
1712	err_unlock:
1713	spin_unlock_bh(lock: &ar->beacon_lock);
1714
1715	err_free:
1716	rcu_read_unlock();
1717	dev_kfree_skb_any(skb);
1718	return err;
1719	}
1720