1 /*
2  * NXP Wireless LAN device driver: WMM
3  *
4  * Copyright 2011-2020 NXP
5  *
6  * This software file (the "File") is distributed by NXP
7  * under the terms of the GNU General Public License Version 2, June 1991
8  * (the "License").  You may use, redistribute and/or modify this File in
9  * accordance with the terms and conditions of the License, a copy of which
10  * is available by writing to the Free Software Foundation, Inc.,
11  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
12  * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
13  *
14  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
15  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
16  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
17  * this warranty disclaimer.
18  */
19 
20 #include "decl.h"
21 #include "ioctl.h"
22 #include "util.h"
23 #include "fw.h"
24 #include "main.h"
25 #include "wmm.h"
26 #include "11n.h"
27 
28 
29 /* Maximum value FW can accept for driver delay in packet transmission */
30 #define DRV_PKT_DELAY_TO_FW_MAX   512
31 
32 
33 #define WMM_QUEUED_PACKET_LOWER_LIMIT   180
34 
35 #define WMM_QUEUED_PACKET_UPPER_LIMIT   200
36 
37 /* Offset for TOS field in the IP header */
38 #define IPTOS_OFFSET 5
39 
40 static bool disable_tx_amsdu;
41 module_param(disable_tx_amsdu, bool, 0644);
42 
43 /* This table inverses the tos_to_tid operation to get a priority
44  * which is in sequential order, and can be compared.
45  * Use this to compare the priority of two different TIDs.
46  */
47 const u8 tos_to_tid_inv[] = {
48 	0x02,  /* from tos_to_tid[2] = 0 */
49 	0x00,  /* from tos_to_tid[0] = 1 */
50 	0x01,  /* from tos_to_tid[1] = 2 */
51 	0x03,
52 	0x04,
53 	0x05,
54 	0x06,
55 	0x07
56 };
57 
58 /* WMM information IE */
59 static const u8 wmm_info_ie[] = { WLAN_EID_VENDOR_SPECIFIC, 0x07,
60 	0x00, 0x50, 0xf2, 0x02,
61 	0x00, 0x01, 0x00
62 };
63 
64 static const u8 wmm_aci_to_qidx_map[] = { WMM_AC_BE,
65 	WMM_AC_BK,
66 	WMM_AC_VI,
67 	WMM_AC_VO
68 };
69 
70 static u8 tos_to_tid[] = {
71 	/* TID DSCP_P2 DSCP_P1 DSCP_P0 WMM_AC */
72 	0x01,			/* 0 1 0 AC_BK */
73 	0x02,			/* 0 0 0 AC_BK */
74 	0x00,			/* 0 0 1 AC_BE */
75 	0x03,			/* 0 1 1 AC_BE */
76 	0x04,			/* 1 0 0 AC_VI */
77 	0x05,			/* 1 0 1 AC_VI */
78 	0x06,			/* 1 1 0 AC_VO */
79 	0x07			/* 1 1 1 AC_VO */
80 };
81 
82 static u8 ac_to_tid[4][2] = { {1, 2}, {0, 3}, {4, 5}, {6, 7} };
83 
84 /*
85  * This function debug prints the priority parameters for a WMM AC.
86  */
87 static void
88 mwifiex_wmm_ac_debug_print(const struct ieee_types_wmm_ac_parameters *ac_param)
89 {
90 	const char *ac_str[] = { "BK", "BE", "VI", "VO" };
91 
92 	pr_debug("info: WMM AC_%s: ACI=%d, ACM=%d, Aifsn=%d, "
93 		 "EcwMin=%d, EcwMax=%d, TxopLimit=%d\n",
94 		 ac_str[wmm_aci_to_qidx_map[(ac_param->aci_aifsn_bitmap
95 					     & MWIFIEX_ACI) >> 5]],
96 		 (ac_param->aci_aifsn_bitmap & MWIFIEX_ACI) >> 5,
97 		 (ac_param->aci_aifsn_bitmap & MWIFIEX_ACM) >> 4,
98 		 ac_param->aci_aifsn_bitmap & MWIFIEX_AIFSN,
99 		 ac_param->ecw_bitmap & MWIFIEX_ECW_MIN,
100 		 (ac_param->ecw_bitmap & MWIFIEX_ECW_MAX) >> 4,
101 		 le16_to_cpu(ac_param->tx_op_limit));
102 }
103 
104 /*
105  * This function allocates a route address list.
106  *
107  * The function also initializes the list with the provided RA.
108  */
109 static struct mwifiex_ra_list_tbl *
110 mwifiex_wmm_allocate_ralist_node(struct mwifiex_adapter *adapter, const u8 *ra)
111 {
112 	struct mwifiex_ra_list_tbl *ra_list;
113 
114 	ra_list = kzalloc(sizeof(struct mwifiex_ra_list_tbl), GFP_ATOMIC);
115 	if (!ra_list)
116 		return NULL;
117 
118 	INIT_LIST_HEAD(&ra_list->list);
119 	skb_queue_head_init(&ra_list->skb_head);
120 
121 	memcpy(ra_list->ra, ra, ETH_ALEN);
122 
123 	ra_list->total_pkt_count = 0;
124 
125 	mwifiex_dbg(adapter, INFO, "info: allocated ra_list %p\n", ra_list);
126 
127 	return ra_list;
128 }
129 
130 /* This function returns random no between 16 and 32 to be used as threshold
131  * for no of packets after which BA setup is initiated.
132  */
133 static u8 mwifiex_get_random_ba_threshold(void)
134 {
135 	u64 ns;
136 	/* setup ba_packet_threshold here random number between
137 	 * [BA_SETUP_PACKET_OFFSET,
138 	 * BA_SETUP_PACKET_OFFSET+BA_SETUP_MAX_PACKET_THRESHOLD-1]
139 	 */
140 	ns = ktime_get_ns();
141 	ns += (ns >> 32) + (ns >> 16);
142 
143 	return ((u8)ns % BA_SETUP_MAX_PACKET_THRESHOLD) + BA_SETUP_PACKET_OFFSET;
144 }
145 
146 /*
147  * This function allocates and adds a RA list for all TIDs
148  * with the given RA.
149  */
150 void mwifiex_ralist_add(struct mwifiex_private *priv, const u8 *ra)
151 {
152 	int i;
153 	struct mwifiex_ra_list_tbl *ra_list;
154 	struct mwifiex_adapter *adapter = priv->adapter;
155 	struct mwifiex_sta_node *node;
156 
157 
158 	for (i = 0; i < MAX_NUM_TID; ++i) {
159 		ra_list = mwifiex_wmm_allocate_ralist_node(adapter, ra);
160 		mwifiex_dbg(adapter, INFO,
161 			    "info: created ra_list %p\n", ra_list);
162 
163 		if (!ra_list)
164 			break;
165 
166 		ra_list->is_11n_enabled = 0;
167 		ra_list->tdls_link = false;
168 		ra_list->ba_status = BA_SETUP_NONE;
169 		ra_list->amsdu_in_ampdu = false;
170 		if (!mwifiex_queuing_ra_based(priv)) {
171 			if (mwifiex_is_tdls_link_setup
172 				(mwifiex_get_tdls_link_status(priv, ra))) {
173 				ra_list->tdls_link = true;
174 				ra_list->is_11n_enabled =
175 					mwifiex_tdls_peer_11n_enabled(priv, ra);
176 			} else {
177 				ra_list->is_11n_enabled = IS_11N_ENABLED(priv);
178 			}
179 		} else {
180 			spin_lock_bh(&priv->sta_list_spinlock);
181 			node = mwifiex_get_sta_entry(priv, ra);
182 			if (node)
183 				ra_list->tx_paused = node->tx_pause;
184 			ra_list->is_11n_enabled =
185 				      mwifiex_is_sta_11n_enabled(priv, node);
186 			if (ra_list->is_11n_enabled)
187 				ra_list->max_amsdu = node->max_amsdu;
188 			spin_unlock_bh(&priv->sta_list_spinlock);
189 		}
190 
191 		mwifiex_dbg(adapter, DATA, "data: ralist %p: is_11n_enabled=%d\n",
192 			    ra_list, ra_list->is_11n_enabled);
193 
194 		if (ra_list->is_11n_enabled) {
195 			ra_list->ba_pkt_count = 0;
196 			ra_list->ba_packet_thr =
197 					      mwifiex_get_random_ba_threshold();
198 		}
199 		list_add_tail(&ra_list->list,
200 			      &priv->wmm.tid_tbl_ptr[i].ra_list);
201 	}
202 }
203 
204 /*
205  * This function sets the WMM queue priorities to their default values.
206  */
207 static void mwifiex_wmm_default_queue_priorities(struct mwifiex_private *priv)
208 {
209 	/* Default queue priorities: VO->VI->BE->BK */
210 	priv->wmm.queue_priority[0] = WMM_AC_VO;
211 	priv->wmm.queue_priority[1] = WMM_AC_VI;
212 	priv->wmm.queue_priority[2] = WMM_AC_BE;
213 	priv->wmm.queue_priority[3] = WMM_AC_BK;
214 }
215 
216 /*
217  * This function map ACs to TIDs.
218  */
219 static void
220 mwifiex_wmm_queue_priorities_tid(struct mwifiex_private *priv)
221 {
222 	struct mwifiex_wmm_desc *wmm = &priv->wmm;
223 	u8 *queue_priority = wmm->queue_priority;
224 	int i;
225 
226 	for (i = 0; i < 4; ++i) {
227 		tos_to_tid[7 - (i * 2)] = ac_to_tid[queue_priority[i]][1];
228 		tos_to_tid[6 - (i * 2)] = ac_to_tid[queue_priority[i]][0];
229 	}
230 
231 	for (i = 0; i < MAX_NUM_TID; ++i)
232 		priv->tos_to_tid_inv[tos_to_tid[i]] = (u8)i;
233 
234 	atomic_set(&wmm->highest_queued_prio, HIGH_PRIO_TID);
235 }
236 
237 /*
238  * This function initializes WMM priority queues.
239  */
240 void
241 mwifiex_wmm_setup_queue_priorities(struct mwifiex_private *priv,
242 				   struct ieee_types_wmm_parameter *wmm_ie)
243 {
244 	u16 cw_min, avg_back_off, tmp[4];
245 	u32 i, j, num_ac;
246 	u8 ac_idx;
247 
248 	if (!wmm_ie || !priv->wmm_enabled) {
249 		/* WMM is not enabled, just set the defaults and return */
250 		mwifiex_wmm_default_queue_priorities(priv);
251 		return;
252 	}
253 
254 	mwifiex_dbg(priv->adapter, INFO,
255 		    "info: WMM Parameter IE: version=%d,\t"
256 		    "qos_info Parameter Set Count=%d, Reserved=%#x\n",
257 		    wmm_ie->version, wmm_ie->qos_info_bitmap &
258 		    IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK,
259 		    wmm_ie->reserved);
260 
261 	for (num_ac = 0; num_ac < ARRAY_SIZE(wmm_ie->ac_params); num_ac++) {
262 		u8 ecw = wmm_ie->ac_params[num_ac].ecw_bitmap;
263 		u8 aci_aifsn = wmm_ie->ac_params[num_ac].aci_aifsn_bitmap;
264 		cw_min = (1 << (ecw & MWIFIEX_ECW_MIN)) - 1;
265 		avg_back_off = (cw_min >> 1) + (aci_aifsn & MWIFIEX_AIFSN);
266 
267 		ac_idx = wmm_aci_to_qidx_map[(aci_aifsn & MWIFIEX_ACI) >> 5];
268 		priv->wmm.queue_priority[ac_idx] = ac_idx;
269 		tmp[ac_idx] = avg_back_off;
270 
271 		mwifiex_dbg(priv->adapter, INFO,
272 			    "info: WMM: CWmax=%d CWmin=%d Avg Back-off=%d\n",
273 			    (1 << ((ecw & MWIFIEX_ECW_MAX) >> 4)) - 1,
274 			    cw_min, avg_back_off);
275 		mwifiex_wmm_ac_debug_print(&wmm_ie->ac_params[num_ac]);
276 	}
277 
278 	/* Bubble sort */
279 	for (i = 0; i < num_ac; i++) {
280 		for (j = 1; j < num_ac - i; j++) {
281 			if (tmp[j - 1] > tmp[j]) {
282 				swap(tmp[j - 1], tmp[j]);
283 				swap(priv->wmm.queue_priority[j - 1],
284 				     priv->wmm.queue_priority[j]);
285 			} else if (tmp[j - 1] == tmp[j]) {
286 				if (priv->wmm.queue_priority[j - 1]
287 				    < priv->wmm.queue_priority[j])
288 					swap(priv->wmm.queue_priority[j - 1],
289 					     priv->wmm.queue_priority[j]);
290 			}
291 		}
292 	}
293 
294 	mwifiex_wmm_queue_priorities_tid(priv);
295 }
296 
297 /*
298  * This function evaluates whether or not an AC is to be downgraded.
299  *
300  * In case the AC is not enabled, the highest AC is returned that is
301  * enabled and does not require admission control.
302  */
303 static enum mwifiex_wmm_ac_e
304 mwifiex_wmm_eval_downgrade_ac(struct mwifiex_private *priv,
305 			      enum mwifiex_wmm_ac_e eval_ac)
306 {
307 	int down_ac;
308 	enum mwifiex_wmm_ac_e ret_ac;
309 	struct mwifiex_wmm_ac_status *ac_status;
310 
311 	ac_status = &priv->wmm.ac_status[eval_ac];
312 
313 	if (!ac_status->disabled)
314 		/* Okay to use this AC, its enabled */
315 		return eval_ac;
316 
317 	/* Setup a default return value of the lowest priority */
318 	ret_ac = WMM_AC_BK;
319 
320 	/*
321 	 *  Find the highest AC that is enabled and does not require
322 	 *  admission control. The spec disallows downgrading to an AC,
323 	 *  which is enabled due to a completed admission control.
324 	 *  Unadmitted traffic is not to be sent on an AC with admitted
325 	 *  traffic.
326 	 */
327 	for (down_ac = WMM_AC_BK; down_ac < eval_ac; down_ac++) {
328 		ac_status = &priv->wmm.ac_status[down_ac];
329 
330 		if (!ac_status->disabled && !ac_status->flow_required)
331 			/* AC is enabled and does not require admission
332 			   control */
333 			ret_ac = (enum mwifiex_wmm_ac_e) down_ac;
334 	}
335 
336 	return ret_ac;
337 }
338 
339 /*
340  * This function downgrades WMM priority queue.
341  */
342 void
343 mwifiex_wmm_setup_ac_downgrade(struct mwifiex_private *priv)
344 {
345 	int ac_val;
346 
347 	mwifiex_dbg(priv->adapter, INFO, "info: WMM: AC Priorities:\t"
348 		    "BK(0), BE(1), VI(2), VO(3)\n");
349 
350 	if (!priv->wmm_enabled) {
351 		/* WMM is not enabled, default priorities */
352 		for (ac_val = WMM_AC_BK; ac_val <= WMM_AC_VO; ac_val++)
353 			priv->wmm.ac_down_graded_vals[ac_val] =
354 						(enum mwifiex_wmm_ac_e) ac_val;
355 	} else {
356 		for (ac_val = WMM_AC_BK; ac_val <= WMM_AC_VO; ac_val++) {
357 			priv->wmm.ac_down_graded_vals[ac_val]
358 				= mwifiex_wmm_eval_downgrade_ac(priv,
359 						(enum mwifiex_wmm_ac_e) ac_val);
360 			mwifiex_dbg(priv->adapter, INFO,
361 				    "info: WMM: AC PRIO %d maps to %d\n",
362 				    ac_val,
363 				    priv->wmm.ac_down_graded_vals[ac_val]);
364 		}
365 	}
366 }
367 
368 /*
369  * This function converts the IP TOS field to an WMM AC
370  * Queue assignment.
371  */
372 static enum mwifiex_wmm_ac_e
373 mwifiex_wmm_convert_tos_to_ac(struct mwifiex_adapter *adapter, u32 tos)
374 {
375 	/* Map of TOS UP values to WMM AC */
376 	static const enum mwifiex_wmm_ac_e tos_to_ac[] = {
377 		WMM_AC_BE,
378 		WMM_AC_BK,
379 		WMM_AC_BK,
380 		WMM_AC_BE,
381 		WMM_AC_VI,
382 		WMM_AC_VI,
383 		WMM_AC_VO,
384 		WMM_AC_VO
385 	};
386 
387 	if (tos >= ARRAY_SIZE(tos_to_ac))
388 		return WMM_AC_BE;
389 
390 	return tos_to_ac[tos];
391 }
392 
393 /*
394  * This function evaluates a given TID and downgrades it to a lower
395  * TID if the WMM Parameter IE received from the AP indicates that the
396  * AP is disabled (due to call admission control (ACM bit). Mapping
397  * of TID to AC is taken care of internally.
398  */
399 u8 mwifiex_wmm_downgrade_tid(struct mwifiex_private *priv, u32 tid)
400 {
401 	enum mwifiex_wmm_ac_e ac, ac_down;
402 	u8 new_tid;
403 
404 	ac = mwifiex_wmm_convert_tos_to_ac(priv->adapter, tid);
405 	ac_down = priv->wmm.ac_down_graded_vals[ac];
406 
407 	/* Send the index to tid array, picking from the array will be
408 	 * taken care by dequeuing function
409 	 */
410 	new_tid = ac_to_tid[ac_down][tid % 2];
411 
412 	return new_tid;
413 }
414 
415 /*
416  * This function initializes the WMM state information and the
417  * WMM data path queues.
418  */
419 void
420 mwifiex_wmm_init(struct mwifiex_adapter *adapter)
421 {
422 	int i, j;
423 	struct mwifiex_private *priv;
424 
425 	for (j = 0; j < adapter->priv_num; ++j) {
426 		priv = adapter->priv[j];
427 		if (!priv)
428 			continue;
429 
430 		for (i = 0; i < MAX_NUM_TID; ++i) {
431 			if (!disable_tx_amsdu &&
432 			    adapter->tx_buf_size > MWIFIEX_TX_DATA_BUF_SIZE_2K)
433 				priv->aggr_prio_tbl[i].amsdu =
434 							priv->tos_to_tid_inv[i];
435 			else
436 				priv->aggr_prio_tbl[i].amsdu =
437 							BA_STREAM_NOT_ALLOWED;
438 			priv->aggr_prio_tbl[i].ampdu_ap =
439 							priv->tos_to_tid_inv[i];
440 			priv->aggr_prio_tbl[i].ampdu_user =
441 							priv->tos_to_tid_inv[i];
442 		}
443 
444 		priv->aggr_prio_tbl[6].amsdu
445 					= priv->aggr_prio_tbl[6].ampdu_ap
446 					= priv->aggr_prio_tbl[6].ampdu_user
447 					= BA_STREAM_NOT_ALLOWED;
448 
449 		priv->aggr_prio_tbl[7].amsdu = priv->aggr_prio_tbl[7].ampdu_ap
450 					= priv->aggr_prio_tbl[7].ampdu_user
451 					= BA_STREAM_NOT_ALLOWED;
452 
453 		mwifiex_set_ba_params(priv);
454 		mwifiex_reset_11n_rx_seq_num(priv);
455 
456 		priv->wmm.drv_pkt_delay_max = MWIFIEX_WMM_DRV_DELAY_MAX;
457 		atomic_set(&priv->wmm.tx_pkts_queued, 0);
458 		atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
459 	}
460 }
461 
462 int mwifiex_bypass_txlist_empty(struct mwifiex_adapter *adapter)
463 {
464 	struct mwifiex_private *priv;
465 	int i;
466 
467 	for (i = 0; i < adapter->priv_num; i++) {
468 		priv = adapter->priv[i];
469 		if (!priv)
470 			continue;
471 		if (adapter->if_ops.is_port_ready &&
472 		    !adapter->if_ops.is_port_ready(priv))
473 			continue;
474 		if (!skb_queue_empty(&priv->bypass_txq))
475 			return false;
476 	}
477 
478 	return true;
479 }
480 
481 /*
482  * This function checks if WMM Tx queue is empty.
483  */
484 int
485 mwifiex_wmm_lists_empty(struct mwifiex_adapter *adapter)
486 {
487 	int i;
488 	struct mwifiex_private *priv;
489 
490 	for (i = 0; i < adapter->priv_num; ++i) {
491 		priv = adapter->priv[i];
492 		if (!priv)
493 			continue;
494 		if (!priv->port_open &&
495 		    (priv->bss_mode != NL80211_IFTYPE_ADHOC))
496 			continue;
497 		if (adapter->if_ops.is_port_ready &&
498 		    !adapter->if_ops.is_port_ready(priv))
499 			continue;
500 		if (atomic_read(&priv->wmm.tx_pkts_queued))
501 			return false;
502 	}
503 
504 	return true;
505 }
506 
507 /*
508  * This function deletes all packets in an RA list node.
509  *
510  * The packet sent completion callback handler are called with
511  * status failure, after they are dequeued to ensure proper
512  * cleanup. The RA list node itself is freed at the end.
513  */
514 static void
515 mwifiex_wmm_del_pkts_in_ralist_node(struct mwifiex_private *priv,
516 				    struct mwifiex_ra_list_tbl *ra_list)
517 {
518 	struct mwifiex_adapter *adapter = priv->adapter;
519 	struct sk_buff *skb, *tmp;
520 
521 	skb_queue_walk_safe(&ra_list->skb_head, skb, tmp) {
522 		skb_unlink(skb, &ra_list->skb_head);
523 		mwifiex_write_data_complete(adapter, skb, 0, -1);
524 	}
525 }
526 
527 /*
528  * This function deletes all packets in an RA list.
529  *
530  * Each nodes in the RA list are freed individually first, and then
531  * the RA list itself is freed.
532  */
533 static void
534 mwifiex_wmm_del_pkts_in_ralist(struct mwifiex_private *priv,
535 			       struct list_head *ra_list_head)
536 {
537 	struct mwifiex_ra_list_tbl *ra_list;
538 
539 	list_for_each_entry(ra_list, ra_list_head, list)
540 		mwifiex_wmm_del_pkts_in_ralist_node(priv, ra_list);
541 }
542 
543 /*
544  * This function deletes all packets in all RA lists.
545  */
546 static void mwifiex_wmm_cleanup_queues(struct mwifiex_private *priv)
547 {
548 	int i;
549 
550 	for (i = 0; i < MAX_NUM_TID; i++)
551 		mwifiex_wmm_del_pkts_in_ralist(priv, &priv->wmm.tid_tbl_ptr[i].
552 								       ra_list);
553 
554 	atomic_set(&priv->wmm.tx_pkts_queued, 0);
555 	atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
556 }
557 
558 /*
559  * This function deletes all route addresses from all RA lists.
560  */
561 static void mwifiex_wmm_delete_all_ralist(struct mwifiex_private *priv)
562 {
563 	struct mwifiex_ra_list_tbl *ra_list, *tmp_node;
564 	int i;
565 
566 	for (i = 0; i < MAX_NUM_TID; ++i) {
567 		mwifiex_dbg(priv->adapter, INFO,
568 			    "info: ra_list: freeing buf for tid %d\n", i);
569 		list_for_each_entry_safe(ra_list, tmp_node,
570 					 &priv->wmm.tid_tbl_ptr[i].ra_list,
571 					 list) {
572 			list_del(&ra_list->list);
573 			kfree(ra_list);
574 		}
575 
576 		INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[i].ra_list);
577 	}
578 }
579 
580 static int mwifiex_free_ack_frame(int id, void *p, void *data)
581 {
582 	pr_warn("Have pending ack frames!\n");
583 	kfree_skb(p);
584 	return 0;
585 }
586 
587 /*
588  * This function cleans up the Tx and Rx queues.
589  *
590  * Cleanup includes -
591  *      - All packets in RA lists
592  *      - All entries in Rx reorder table
593  *      - All entries in Tx BA stream table
594  *      - MPA buffer (if required)
595  *      - All RA lists
596  */
597 void
598 mwifiex_clean_txrx(struct mwifiex_private *priv)
599 {
600 	struct sk_buff *skb, *tmp;
601 
602 	mwifiex_11n_cleanup_reorder_tbl(priv);
603 	spin_lock_bh(&priv->wmm.ra_list_spinlock);
604 
605 	mwifiex_wmm_cleanup_queues(priv);
606 	mwifiex_11n_delete_all_tx_ba_stream_tbl(priv);
607 
608 	if (priv->adapter->if_ops.cleanup_mpa_buf)
609 		priv->adapter->if_ops.cleanup_mpa_buf(priv->adapter);
610 
611 	mwifiex_wmm_delete_all_ralist(priv);
612 	memcpy(tos_to_tid, ac_to_tid, sizeof(tos_to_tid));
613 
614 	if (priv->adapter->if_ops.clean_pcie_ring &&
615 	    !test_bit(MWIFIEX_SURPRISE_REMOVED, &priv->adapter->work_flags))
616 		priv->adapter->if_ops.clean_pcie_ring(priv->adapter);
617 	spin_unlock_bh(&priv->wmm.ra_list_spinlock);
618 
619 	skb_queue_walk_safe(&priv->tdls_txq, skb, tmp) {
620 		skb_unlink(skb, &priv->tdls_txq);
621 		mwifiex_write_data_complete(priv->adapter, skb, 0, -1);
622 	}
623 
624 	skb_queue_walk_safe(&priv->bypass_txq, skb, tmp) {
625 		skb_unlink(skb, &priv->bypass_txq);
626 		mwifiex_write_data_complete(priv->adapter, skb, 0, -1);
627 	}
628 	atomic_set(&priv->adapter->bypass_tx_pending, 0);
629 
630 	idr_for_each(&priv->ack_status_frames, mwifiex_free_ack_frame, NULL);
631 	idr_destroy(&priv->ack_status_frames);
632 }
633 
634 /*
635  * This function retrieves a particular RA list node, matching with the
636  * given TID and RA address.
637  */
638 struct mwifiex_ra_list_tbl *
639 mwifiex_wmm_get_ralist_node(struct mwifiex_private *priv, u8 tid,
640 			    const u8 *ra_addr)
641 {
642 	struct mwifiex_ra_list_tbl *ra_list;
643 
644 	list_for_each_entry(ra_list, &priv->wmm.tid_tbl_ptr[tid].ra_list,
645 			    list) {
646 		if (!memcmp(ra_list->ra, ra_addr, ETH_ALEN))
647 			return ra_list;
648 	}
649 
650 	return NULL;
651 }
652 
653 void mwifiex_update_ralist_tx_pause(struct mwifiex_private *priv, u8 *mac,
654 				    u8 tx_pause)
655 {
656 	struct mwifiex_ra_list_tbl *ra_list;
657 	u32 pkt_cnt = 0, tx_pkts_queued;
658 	int i;
659 
660 	spin_lock_bh(&priv->wmm.ra_list_spinlock);
661 
662 	for (i = 0; i < MAX_NUM_TID; ++i) {
663 		ra_list = mwifiex_wmm_get_ralist_node(priv, i, mac);
664 		if (ra_list && ra_list->tx_paused != tx_pause) {
665 			pkt_cnt += ra_list->total_pkt_count;
666 			ra_list->tx_paused = tx_pause;
667 			if (tx_pause)
668 				priv->wmm.pkts_paused[i] +=
669 					ra_list->total_pkt_count;
670 			else
671 				priv->wmm.pkts_paused[i] -=
672 					ra_list->total_pkt_count;
673 		}
674 	}
675 
676 	if (pkt_cnt) {
677 		tx_pkts_queued = atomic_read(&priv->wmm.tx_pkts_queued);
678 		if (tx_pause)
679 			tx_pkts_queued -= pkt_cnt;
680 		else
681 			tx_pkts_queued += pkt_cnt;
682 
683 		atomic_set(&priv->wmm.tx_pkts_queued, tx_pkts_queued);
684 		atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
685 	}
686 	spin_unlock_bh(&priv->wmm.ra_list_spinlock);
687 }
688 
689 /* This function updates non-tdls peer ralist tx_pause while
690  * tdls channel switching
691  */
692 void mwifiex_update_ralist_tx_pause_in_tdls_cs(struct mwifiex_private *priv,
693 					       u8 *mac, u8 tx_pause)
694 {
695 	struct mwifiex_ra_list_tbl *ra_list;
696 	u32 pkt_cnt = 0, tx_pkts_queued;
697 	int i;
698 
699 	spin_lock_bh(&priv->wmm.ra_list_spinlock);
700 
701 	for (i = 0; i < MAX_NUM_TID; ++i) {
702 		list_for_each_entry(ra_list, &priv->wmm.tid_tbl_ptr[i].ra_list,
703 				    list) {
704 			if (!memcmp(ra_list->ra, mac, ETH_ALEN))
705 				continue;
706 
707 			if (ra_list->tx_paused != tx_pause) {
708 				pkt_cnt += ra_list->total_pkt_count;
709 				ra_list->tx_paused = tx_pause;
710 				if (tx_pause)
711 					priv->wmm.pkts_paused[i] +=
712 						ra_list->total_pkt_count;
713 				else
714 					priv->wmm.pkts_paused[i] -=
715 						ra_list->total_pkt_count;
716 			}
717 		}
718 	}
719 
720 	if (pkt_cnt) {
721 		tx_pkts_queued = atomic_read(&priv->wmm.tx_pkts_queued);
722 		if (tx_pause)
723 			tx_pkts_queued -= pkt_cnt;
724 		else
725 			tx_pkts_queued += pkt_cnt;
726 
727 		atomic_set(&priv->wmm.tx_pkts_queued, tx_pkts_queued);
728 		atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
729 	}
730 	spin_unlock_bh(&priv->wmm.ra_list_spinlock);
731 }
732 
733 /*
734  * This function retrieves an RA list node for a given TID and
735  * RA address pair.
736  *
737  * If no such node is found, a new node is added first and then
738  * retrieved.
739  */
740 struct mwifiex_ra_list_tbl *
741 mwifiex_wmm_get_queue_raptr(struct mwifiex_private *priv, u8 tid,
742 			    const u8 *ra_addr)
743 {
744 	struct mwifiex_ra_list_tbl *ra_list;
745 
746 	ra_list = mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
747 	if (ra_list)
748 		return ra_list;
749 	mwifiex_ralist_add(priv, ra_addr);
750 
751 	return mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
752 }
753 
754 /*
755  * This function deletes RA list nodes for given mac for all TIDs.
756  * Function also decrements TX pending count accordingly.
757  */
758 void
759 mwifiex_wmm_del_peer_ra_list(struct mwifiex_private *priv, const u8 *ra_addr)
760 {
761 	struct mwifiex_ra_list_tbl *ra_list;
762 	int i;
763 
764 	spin_lock_bh(&priv->wmm.ra_list_spinlock);
765 
766 	for (i = 0; i < MAX_NUM_TID; ++i) {
767 		ra_list = mwifiex_wmm_get_ralist_node(priv, i, ra_addr);
768 
769 		if (!ra_list)
770 			continue;
771 		mwifiex_wmm_del_pkts_in_ralist_node(priv, ra_list);
772 		if (ra_list->tx_paused)
773 			priv->wmm.pkts_paused[i] -= ra_list->total_pkt_count;
774 		else
775 			atomic_sub(ra_list->total_pkt_count,
776 				   &priv->wmm.tx_pkts_queued);
777 		list_del(&ra_list->list);
778 		kfree(ra_list);
779 	}
780 	spin_unlock_bh(&priv->wmm.ra_list_spinlock);
781 }
782 
783 /*
784  * This function checks if a particular RA list node exists in a given TID
785  * table index.
786  */
787 int
788 mwifiex_is_ralist_valid(struct mwifiex_private *priv,
789 			struct mwifiex_ra_list_tbl *ra_list, int ptr_index)
790 {
791 	struct mwifiex_ra_list_tbl *rlist;
792 
793 	list_for_each_entry(rlist, &priv->wmm.tid_tbl_ptr[ptr_index].ra_list,
794 			    list) {
795 		if (rlist == ra_list)
796 			return true;
797 	}
798 
799 	return false;
800 }
801 
802 /*
803  * This function adds a packet to bypass TX queue.
804  * This is special TX queue for packets which can be sent even when port_open
805  * is false.
806  */
807 void
808 mwifiex_wmm_add_buf_bypass_txqueue(struct mwifiex_private *priv,
809 				   struct sk_buff *skb)
810 {
811 	skb_queue_tail(&priv->bypass_txq, skb);
812 }
813 
814 /*
815  * This function adds a packet to WMM queue.
816  *
817  * In disconnected state the packet is immediately dropped and the
818  * packet send completion callback is called with status failure.
819  *
820  * Otherwise, the correct RA list node is located and the packet
821  * is queued at the list tail.
822  */
823 void
824 mwifiex_wmm_add_buf_txqueue(struct mwifiex_private *priv,
825 			    struct sk_buff *skb)
826 {
827 	struct mwifiex_adapter *adapter = priv->adapter;
828 	u32 tid;
829 	struct mwifiex_ra_list_tbl *ra_list;
830 	u8 ra[ETH_ALEN], tid_down;
831 	struct list_head list_head;
832 	int tdls_status = TDLS_NOT_SETUP;
833 	struct ethhdr *eth_hdr = (struct ethhdr *)skb->data;
834 	struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
835 
836 	memcpy(ra, eth_hdr->h_dest, ETH_ALEN);
837 
838 	if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
839 	    ISSUPP_TDLS_ENABLED(adapter->fw_cap_info)) {
840 		if (ntohs(eth_hdr->h_proto) == ETH_P_TDLS)
841 			mwifiex_dbg(adapter, DATA,
842 				    "TDLS setup packet for %pM.\t"
843 				    "Don't block\n", ra);
844 		else if (memcmp(priv->cfg_bssid, ra, ETH_ALEN))
845 			tdls_status = mwifiex_get_tdls_link_status(priv, ra);
846 	}
847 
848 	if (!priv->media_connected && !mwifiex_is_skb_mgmt_frame(skb)) {
849 		mwifiex_dbg(adapter, DATA, "data: drop packet in disconnect\n");
850 		mwifiex_write_data_complete(adapter, skb, 0, -1);
851 		return;
852 	}
853 
854 	tid = skb->priority;
855 
856 	spin_lock_bh(&priv->wmm.ra_list_spinlock);
857 
858 	tid_down = mwifiex_wmm_downgrade_tid(priv, tid);
859 
860 	/* In case of infra as we have already created the list during
861 	   association we just don't have to call get_queue_raptr, we will
862 	   have only 1 raptr for a tid in case of infra */
863 	if (!mwifiex_queuing_ra_based(priv) &&
864 	    !mwifiex_is_skb_mgmt_frame(skb)) {
865 		switch (tdls_status) {
866 		case TDLS_SETUP_COMPLETE:
867 		case TDLS_CHAN_SWITCHING:
868 		case TDLS_IN_BASE_CHAN:
869 		case TDLS_IN_OFF_CHAN:
870 			ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down,
871 							      ra);
872 			tx_info->flags |= MWIFIEX_BUF_FLAG_TDLS_PKT;
873 			break;
874 		case TDLS_SETUP_INPROGRESS:
875 			skb_queue_tail(&priv->tdls_txq, skb);
876 			spin_unlock_bh(&priv->wmm.ra_list_spinlock);
877 			return;
878 		default:
879 			list_head = priv->wmm.tid_tbl_ptr[tid_down].ra_list;
880 			ra_list = list_first_entry_or_null(&list_head,
881 					struct mwifiex_ra_list_tbl, list);
882 			break;
883 		}
884 	} else {
885 		memcpy(ra, skb->data, ETH_ALEN);
886 		if (ra[0] & 0x01 || mwifiex_is_skb_mgmt_frame(skb))
887 			eth_broadcast_addr(ra);
888 		ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down, ra);
889 	}
890 
891 	if (!ra_list) {
892 		spin_unlock_bh(&priv->wmm.ra_list_spinlock);
893 		mwifiex_write_data_complete(adapter, skb, 0, -1);
894 		return;
895 	}
896 
897 	skb_queue_tail(&ra_list->skb_head, skb);
898 
899 	ra_list->ba_pkt_count++;
900 	ra_list->total_pkt_count++;
901 
902 	if (atomic_read(&priv->wmm.highest_queued_prio) <
903 						priv->tos_to_tid_inv[tid_down])
904 		atomic_set(&priv->wmm.highest_queued_prio,
905 			   priv->tos_to_tid_inv[tid_down]);
906 
907 	if (ra_list->tx_paused)
908 		priv->wmm.pkts_paused[tid_down]++;
909 	else
910 		atomic_inc(&priv->wmm.tx_pkts_queued);
911 
912 	spin_unlock_bh(&priv->wmm.ra_list_spinlock);
913 }
914 
915 /*
916  * This function processes the get WMM status command response from firmware.
917  *
918  * The response may contain multiple TLVs -
919  *      - AC Queue status TLVs
920  *      - Current WMM Parameter IE TLV
921  *      - Admission Control action frame TLVs
922  *
923  * This function parses the TLVs and then calls further specific functions
924  * to process any changes in the queue prioritize or state.
925  */
926 int mwifiex_ret_wmm_get_status(struct mwifiex_private *priv,
927 			       const struct host_cmd_ds_command *resp)
928 {
929 	u8 *curr = (u8 *) &resp->params.get_wmm_status;
930 	uint16_t resp_len = le16_to_cpu(resp->size), tlv_len;
931 	int mask = IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK;
932 	bool valid = true;
933 
934 	struct mwifiex_ie_types_data *tlv_hdr;
935 	struct mwifiex_ie_types_wmm_queue_status *tlv_wmm_qstatus;
936 	struct ieee_types_wmm_parameter *wmm_param_ie = NULL;
937 	struct mwifiex_wmm_ac_status *ac_status;
938 
939 	mwifiex_dbg(priv->adapter, INFO,
940 		    "info: WMM: WMM_GET_STATUS cmdresp received: %d\n",
941 		    resp_len);
942 
943 	while ((resp_len >= sizeof(tlv_hdr->header)) && valid) {
944 		tlv_hdr = (struct mwifiex_ie_types_data *) curr;
945 		tlv_len = le16_to_cpu(tlv_hdr->header.len);
946 
947 		if (resp_len < tlv_len + sizeof(tlv_hdr->header))
948 			break;
949 
950 		switch (le16_to_cpu(tlv_hdr->header.type)) {
951 		case TLV_TYPE_WMMQSTATUS:
952 			tlv_wmm_qstatus =
953 				(struct mwifiex_ie_types_wmm_queue_status *)
954 				tlv_hdr;
955 			mwifiex_dbg(priv->adapter, CMD,
956 				    "info: CMD_RESP: WMM_GET_STATUS:\t"
957 				    "QSTATUS TLV: %d, %d, %d\n",
958 				    tlv_wmm_qstatus->queue_index,
959 				    tlv_wmm_qstatus->flow_required,
960 				    tlv_wmm_qstatus->disabled);
961 
962 			ac_status = &priv->wmm.ac_status[tlv_wmm_qstatus->
963 							 queue_index];
964 			ac_status->disabled = tlv_wmm_qstatus->disabled;
965 			ac_status->flow_required =
966 						tlv_wmm_qstatus->flow_required;
967 			ac_status->flow_created = tlv_wmm_qstatus->flow_created;
968 			break;
969 
970 		case WLAN_EID_VENDOR_SPECIFIC:
971 			/*
972 			 * Point the regular IEEE IE 2 bytes into the Marvell IE
973 			 *   and setup the IEEE IE type and length byte fields
974 			 */
975 
976 			wmm_param_ie =
977 				(struct ieee_types_wmm_parameter *) (curr +
978 								    2);
979 			wmm_param_ie->vend_hdr.len = (u8) tlv_len;
980 			wmm_param_ie->vend_hdr.element_id =
981 						WLAN_EID_VENDOR_SPECIFIC;
982 
983 			mwifiex_dbg(priv->adapter, CMD,
984 				    "info: CMD_RESP: WMM_GET_STATUS:\t"
985 				    "WMM Parameter Set Count: %d\n",
986 				    wmm_param_ie->qos_info_bitmap & mask);
987 
988 			if (wmm_param_ie->vend_hdr.len + 2 >
989 				sizeof(struct ieee_types_wmm_parameter))
990 				break;
991 
992 			memcpy((u8 *) &priv->curr_bss_params.bss_descriptor.
993 			       wmm_ie, wmm_param_ie,
994 			       wmm_param_ie->vend_hdr.len + 2);
995 
996 			break;
997 
998 		default:
999 			valid = false;
1000 			break;
1001 		}
1002 
1003 		curr += (tlv_len + sizeof(tlv_hdr->header));
1004 		resp_len -= (tlv_len + sizeof(tlv_hdr->header));
1005 	}
1006 
1007 	mwifiex_wmm_setup_queue_priorities(priv, wmm_param_ie);
1008 	mwifiex_wmm_setup_ac_downgrade(priv);
1009 
1010 	return 0;
1011 }
1012 
1013 /*
1014  * Callback handler from the command module to allow insertion of a WMM TLV.
1015  *
1016  * If the BSS we are associating to supports WMM, this function adds the
1017  * required WMM Information IE to the association request command buffer in
1018  * the form of a Marvell extended IEEE IE.
1019  */
1020 u32
1021 mwifiex_wmm_process_association_req(struct mwifiex_private *priv,
1022 				    u8 **assoc_buf,
1023 				    struct ieee_types_wmm_parameter *wmm_ie,
1024 				    struct ieee80211_ht_cap *ht_cap)
1025 {
1026 	struct mwifiex_ie_types_wmm_param_set *wmm_tlv;
1027 	u32 ret_len = 0;
1028 
1029 	/* Null checks */
1030 	if (!assoc_buf)
1031 		return 0;
1032 	if (!(*assoc_buf))
1033 		return 0;
1034 
1035 	if (!wmm_ie)
1036 		return 0;
1037 
1038 	mwifiex_dbg(priv->adapter, INFO,
1039 		    "info: WMM: process assoc req: bss->wmm_ie=%#x\n",
1040 		    wmm_ie->vend_hdr.element_id);
1041 
1042 	if ((priv->wmm_required ||
1043 	     (ht_cap && (priv->adapter->config_bands & BAND_GN ||
1044 	     priv->adapter->config_bands & BAND_AN))) &&
1045 	    wmm_ie->vend_hdr.element_id == WLAN_EID_VENDOR_SPECIFIC) {
1046 		wmm_tlv = (struct mwifiex_ie_types_wmm_param_set *) *assoc_buf;
1047 		wmm_tlv->header.type = cpu_to_le16((u16) wmm_info_ie[0]);
1048 		wmm_tlv->header.len = cpu_to_le16((u16) wmm_info_ie[1]);
1049 		memcpy(wmm_tlv->wmm_ie, &wmm_info_ie[2],
1050 		       le16_to_cpu(wmm_tlv->header.len));
1051 		if (wmm_ie->qos_info_bitmap & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD)
1052 			memcpy((u8 *) (wmm_tlv->wmm_ie
1053 				       + le16_to_cpu(wmm_tlv->header.len)
1054 				       - sizeof(priv->wmm_qosinfo)),
1055 			       &priv->wmm_qosinfo, sizeof(priv->wmm_qosinfo));
1056 
1057 		ret_len = sizeof(wmm_tlv->header)
1058 			  + le16_to_cpu(wmm_tlv->header.len);
1059 
1060 		*assoc_buf += ret_len;
1061 	}
1062 
1063 	return ret_len;
1064 }
1065 
1066 /*
1067  * This function computes the time delay in the driver queues for a
1068  * given packet.
1069  *
1070  * When the packet is received at the OS/Driver interface, the current
1071  * time is set in the packet structure. The difference between the present
1072  * time and that received time is computed in this function and limited
1073  * based on pre-compiled limits in the driver.
1074  */
1075 u8
1076 mwifiex_wmm_compute_drv_pkt_delay(struct mwifiex_private *priv,
1077 				  const struct sk_buff *skb)
1078 {
1079 	u32 queue_delay = ktime_to_ms(net_timedelta(skb->tstamp));
1080 	u8 ret_val;
1081 
1082 	/*
1083 	 * Queue delay is passed as a uint8 in units of 2ms (ms shifted
1084 	 *  by 1). Min value (other than 0) is therefore 2ms, max is 510ms.
1085 	 *
1086 	 * Pass max value if queue_delay is beyond the uint8 range
1087 	 */
1088 	ret_val = (u8) (min(queue_delay, priv->wmm.drv_pkt_delay_max) >> 1);
1089 
1090 	mwifiex_dbg(priv->adapter, DATA, "data: WMM: Pkt Delay: %d ms,\t"
1091 		    "%d ms sent to FW\n", queue_delay, ret_val);
1092 
1093 	return ret_val;
1094 }
1095 
1096 /*
1097  * This function retrieves the highest priority RA list table pointer.
1098  */
1099 static struct mwifiex_ra_list_tbl *
1100 mwifiex_wmm_get_highest_priolist_ptr(struct mwifiex_adapter *adapter,
1101 				     struct mwifiex_private **priv, int *tid)
1102 {
1103 	struct mwifiex_private *priv_tmp;
1104 	struct mwifiex_ra_list_tbl *ptr;
1105 	struct mwifiex_tid_tbl *tid_ptr;
1106 	atomic_t *hqp;
1107 	int i, j;
1108 
1109 	/* check the BSS with highest priority first */
1110 	for (j = adapter->priv_num - 1; j >= 0; --j) {
1111 		/* iterate over BSS with the equal priority */
1112 		list_for_each_entry(adapter->bss_prio_tbl[j].bss_prio_cur,
1113 				    &adapter->bss_prio_tbl[j].bss_prio_head,
1114 				    list) {
1115 
1116 try_again:
1117 			priv_tmp = adapter->bss_prio_tbl[j].bss_prio_cur->priv;
1118 
1119 			if (((priv_tmp->bss_mode != NL80211_IFTYPE_ADHOC) &&
1120 			     !priv_tmp->port_open) ||
1121 			    (atomic_read(&priv_tmp->wmm.tx_pkts_queued) == 0))
1122 				continue;
1123 
1124 			if (adapter->if_ops.is_port_ready &&
1125 			    !adapter->if_ops.is_port_ready(priv_tmp))
1126 				continue;
1127 
1128 			/* iterate over the WMM queues of the BSS */
1129 			hqp = &priv_tmp->wmm.highest_queued_prio;
1130 			for (i = atomic_read(hqp); i >= LOW_PRIO_TID; --i) {
1131 
1132 				spin_lock_bh(&priv_tmp->wmm.ra_list_spinlock);
1133 
1134 				tid_ptr = &(priv_tmp)->wmm.
1135 					tid_tbl_ptr[tos_to_tid[i]];
1136 
1137 				/* iterate over receiver addresses */
1138 				list_for_each_entry(ptr, &tid_ptr->ra_list,
1139 						    list) {
1140 
1141 					if (!ptr->tx_paused &&
1142 					    !skb_queue_empty(&ptr->skb_head))
1143 						/* holds both locks */
1144 						goto found;
1145 				}
1146 
1147 				spin_unlock_bh(&priv_tmp->wmm.ra_list_spinlock);
1148 			}
1149 
1150 			if (atomic_read(&priv_tmp->wmm.tx_pkts_queued) != 0) {
1151 				atomic_set(&priv_tmp->wmm.highest_queued_prio,
1152 					   HIGH_PRIO_TID);
1153 				/* Iterate current private once more, since
1154 				 * there still exist packets in data queue
1155 				 */
1156 				goto try_again;
1157 			} else
1158 				atomic_set(&priv_tmp->wmm.highest_queued_prio,
1159 					   NO_PKT_PRIO_TID);
1160 		}
1161 	}
1162 
1163 	return NULL;
1164 
1165 found:
1166 	/* holds ra_list_spinlock */
1167 	if (atomic_read(hqp) > i)
1168 		atomic_set(hqp, i);
1169 	spin_unlock_bh(&priv_tmp->wmm.ra_list_spinlock);
1170 
1171 	*priv = priv_tmp;
1172 	*tid = tos_to_tid[i];
1173 
1174 	return ptr;
1175 }
1176 
1177 /* This functions rotates ra and bss lists so packets are picked round robin.
1178  *
1179  * After a packet is successfully transmitted, rotate the ra list, so the ra
1180  * next to the one transmitted, will come first in the list. This way we pick
1181  * the ra' in a round robin fashion. Same applies to bss nodes of equal
1182  * priority.
1183  *
1184  * Function also increments wmm.packets_out counter.
1185  */
1186 void mwifiex_rotate_priolists(struct mwifiex_private *priv,
1187 				 struct mwifiex_ra_list_tbl *ra,
1188 				 int tid)
1189 {
1190 	struct mwifiex_adapter *adapter = priv->adapter;
1191 	struct mwifiex_bss_prio_tbl *tbl = adapter->bss_prio_tbl;
1192 	struct mwifiex_tid_tbl *tid_ptr = &priv->wmm.tid_tbl_ptr[tid];
1193 
1194 	spin_lock_bh(&tbl[priv->bss_priority].bss_prio_lock);
1195 	/*
1196 	 * dirty trick: we remove 'head' temporarily and reinsert it after
1197 	 * curr bss node. imagine list to stay fixed while head is moved
1198 	 */
1199 	list_move(&tbl[priv->bss_priority].bss_prio_head,
1200 		  &tbl[priv->bss_priority].bss_prio_cur->list);
1201 	spin_unlock_bh(&tbl[priv->bss_priority].bss_prio_lock);
1202 
1203 	spin_lock_bh(&priv->wmm.ra_list_spinlock);
1204 	if (mwifiex_is_ralist_valid(priv, ra, tid)) {
1205 		priv->wmm.packets_out[tid]++;
1206 		/* same as above */
1207 		list_move(&tid_ptr->ra_list, &ra->list);
1208 	}
1209 	spin_unlock_bh(&priv->wmm.ra_list_spinlock);
1210 }
1211 
1212 /*
1213  * This function checks if 11n aggregation is possible.
1214  */
1215 static int
1216 mwifiex_is_11n_aggragation_possible(struct mwifiex_private *priv,
1217 				    struct mwifiex_ra_list_tbl *ptr,
1218 				    int max_buf_size)
1219 {
1220 	int count = 0, total_size = 0;
1221 	struct sk_buff *skb, *tmp;
1222 	int max_amsdu_size;
1223 
1224 	if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP && priv->ap_11n_enabled &&
1225 	    ptr->is_11n_enabled)
1226 		max_amsdu_size = min_t(int, ptr->max_amsdu, max_buf_size);
1227 	else
1228 		max_amsdu_size = max_buf_size;
1229 
1230 	skb_queue_walk_safe(&ptr->skb_head, skb, tmp) {
1231 		total_size += skb->len;
1232 		if (total_size >= max_amsdu_size)
1233 			break;
1234 		if (++count >= MIN_NUM_AMSDU)
1235 			return true;
1236 	}
1237 
1238 	return false;
1239 }
1240 
1241 /*
1242  * This function sends a single packet to firmware for transmission.
1243  */
1244 static void
1245 mwifiex_send_single_packet(struct mwifiex_private *priv,
1246 			   struct mwifiex_ra_list_tbl *ptr, int ptr_index)
1247 			   __releases(&priv->wmm.ra_list_spinlock)
1248 {
1249 	struct sk_buff *skb, *skb_next;
1250 	struct mwifiex_tx_param tx_param;
1251 	struct mwifiex_adapter *adapter = priv->adapter;
1252 	struct mwifiex_txinfo *tx_info;
1253 
1254 	if (skb_queue_empty(&ptr->skb_head)) {
1255 		spin_unlock_bh(&priv->wmm.ra_list_spinlock);
1256 		mwifiex_dbg(adapter, DATA, "data: nothing to send\n");
1257 		return;
1258 	}
1259 
1260 	skb = skb_dequeue(&ptr->skb_head);
1261 
1262 	tx_info = MWIFIEX_SKB_TXCB(skb);
1263 	mwifiex_dbg(adapter, DATA,
1264 		    "data: dequeuing the packet %p %p\n", ptr, skb);
1265 
1266 	ptr->total_pkt_count--;
1267 
1268 	if (!skb_queue_empty(&ptr->skb_head))
1269 		skb_next = skb_peek(&ptr->skb_head);
1270 	else
1271 		skb_next = NULL;
1272 
1273 	spin_unlock_bh(&priv->wmm.ra_list_spinlock);
1274 
1275 	tx_param.next_pkt_len = ((skb_next) ? skb_next->len +
1276 				sizeof(struct txpd) : 0);
1277 
1278 	if (mwifiex_process_tx(priv, skb, &tx_param) == -EBUSY) {
1279 		/* Queue the packet back at the head */
1280 		spin_lock_bh(&priv->wmm.ra_list_spinlock);
1281 
1282 		if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1283 			spin_unlock_bh(&priv->wmm.ra_list_spinlock);
1284 			mwifiex_write_data_complete(adapter, skb, 0, -1);
1285 			return;
1286 		}
1287 
1288 		skb_queue_tail(&ptr->skb_head, skb);
1289 
1290 		ptr->total_pkt_count++;
1291 		ptr->ba_pkt_count++;
1292 		tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1293 		spin_unlock_bh(&priv->wmm.ra_list_spinlock);
1294 	} else {
1295 		mwifiex_rotate_priolists(priv, ptr, ptr_index);
1296 		atomic_dec(&priv->wmm.tx_pkts_queued);
1297 	}
1298 }
1299 
1300 /*
1301  * This function checks if the first packet in the given RA list
1302  * is already processed or not.
1303  */
1304 static int
1305 mwifiex_is_ptr_processed(struct mwifiex_private *priv,
1306 			 struct mwifiex_ra_list_tbl *ptr)
1307 {
1308 	struct sk_buff *skb;
1309 	struct mwifiex_txinfo *tx_info;
1310 
1311 	if (skb_queue_empty(&ptr->skb_head))
1312 		return false;
1313 
1314 	skb = skb_peek(&ptr->skb_head);
1315 
1316 	tx_info = MWIFIEX_SKB_TXCB(skb);
1317 	if (tx_info->flags & MWIFIEX_BUF_FLAG_REQUEUED_PKT)
1318 		return true;
1319 
1320 	return false;
1321 }
1322 
1323 /*
1324  * This function sends a single processed packet to firmware for
1325  * transmission.
1326  */
1327 static void
1328 mwifiex_send_processed_packet(struct mwifiex_private *priv,
1329 			      struct mwifiex_ra_list_tbl *ptr, int ptr_index)
1330 				__releases(&priv->wmm.ra_list_spinlock)
1331 {
1332 	struct mwifiex_tx_param tx_param;
1333 	struct mwifiex_adapter *adapter = priv->adapter;
1334 	int ret = -1;
1335 	struct sk_buff *skb, *skb_next;
1336 	struct mwifiex_txinfo *tx_info;
1337 
1338 	if (skb_queue_empty(&ptr->skb_head)) {
1339 		spin_unlock_bh(&priv->wmm.ra_list_spinlock);
1340 		return;
1341 	}
1342 
1343 	skb = skb_dequeue(&ptr->skb_head);
1344 
1345 	if (adapter->data_sent || adapter->tx_lock_flag) {
1346 		ptr->total_pkt_count--;
1347 		spin_unlock_bh(&priv->wmm.ra_list_spinlock);
1348 		skb_queue_tail(&adapter->tx_data_q, skb);
1349 		atomic_dec(&priv->wmm.tx_pkts_queued);
1350 		atomic_inc(&adapter->tx_queued);
1351 		return;
1352 	}
1353 
1354 	if (!skb_queue_empty(&ptr->skb_head))
1355 		skb_next = skb_peek(&ptr->skb_head);
1356 	else
1357 		skb_next = NULL;
1358 
1359 	tx_info = MWIFIEX_SKB_TXCB(skb);
1360 
1361 	spin_unlock_bh(&priv->wmm.ra_list_spinlock);
1362 
1363 	tx_param.next_pkt_len =
1364 		((skb_next) ? skb_next->len +
1365 		 sizeof(struct txpd) : 0);
1366 	if (adapter->iface_type == MWIFIEX_USB) {
1367 		ret = adapter->if_ops.host_to_card(adapter, priv->usb_port,
1368 						   skb, &tx_param);
1369 	} else {
1370 		ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
1371 						   skb, &tx_param);
1372 	}
1373 
1374 	switch (ret) {
1375 	case -EBUSY:
1376 		mwifiex_dbg(adapter, ERROR, "data: -EBUSY is returned\n");
1377 		spin_lock_bh(&priv->wmm.ra_list_spinlock);
1378 
1379 		if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1380 			spin_unlock_bh(&priv->wmm.ra_list_spinlock);
1381 			mwifiex_write_data_complete(adapter, skb, 0, -1);
1382 			return;
1383 		}
1384 
1385 		skb_queue_tail(&ptr->skb_head, skb);
1386 
1387 		tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1388 		spin_unlock_bh(&priv->wmm.ra_list_spinlock);
1389 		break;
1390 	case -1:
1391 		mwifiex_dbg(adapter, ERROR, "host_to_card failed: %#x\n", ret);
1392 		adapter->dbg.num_tx_host_to_card_failure++;
1393 		mwifiex_write_data_complete(adapter, skb, 0, ret);
1394 		break;
1395 	case -EINPROGRESS:
1396 		break;
1397 	case 0:
1398 		mwifiex_write_data_complete(adapter, skb, 0, ret);
1399 		break;
1400 	default:
1401 		break;
1402 	}
1403 	if (ret != -EBUSY) {
1404 		mwifiex_rotate_priolists(priv, ptr, ptr_index);
1405 		atomic_dec(&priv->wmm.tx_pkts_queued);
1406 		spin_lock_bh(&priv->wmm.ra_list_spinlock);
1407 		ptr->total_pkt_count--;
1408 		spin_unlock_bh(&priv->wmm.ra_list_spinlock);
1409 	}
1410 }
1411 
1412 /*
1413  * This function dequeues a packet from the highest priority list
1414  * and transmits it.
1415  */
1416 static int
1417 mwifiex_dequeue_tx_packet(struct mwifiex_adapter *adapter)
1418 {
1419 	struct mwifiex_ra_list_tbl *ptr;
1420 	struct mwifiex_private *priv = NULL;
1421 	int ptr_index = 0;
1422 	u8 ra[ETH_ALEN];
1423 	int tid_del = 0, tid = 0;
1424 
1425 	ptr = mwifiex_wmm_get_highest_priolist_ptr(adapter, &priv, &ptr_index);
1426 	if (!ptr)
1427 		return -1;
1428 
1429 	tid = mwifiex_get_tid(ptr);
1430 
1431 	mwifiex_dbg(adapter, DATA, "data: tid=%d\n", tid);
1432 
1433 	spin_lock_bh(&priv->wmm.ra_list_spinlock);
1434 	if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1435 		spin_unlock_bh(&priv->wmm.ra_list_spinlock);
1436 		return -1;
1437 	}
1438 
1439 	if (mwifiex_is_ptr_processed(priv, ptr)) {
1440 		mwifiex_send_processed_packet(priv, ptr, ptr_index);
1441 		/* ra_list_spinlock has been freed in
1442 		   mwifiex_send_processed_packet() */
1443 		return 0;
1444 	}
1445 
1446 	if (!ptr->is_11n_enabled ||
1447 		ptr->ba_status ||
1448 		priv->wps.session_enable) {
1449 		if (ptr->is_11n_enabled &&
1450 			ptr->ba_status &&
1451 			ptr->amsdu_in_ampdu &&
1452 			mwifiex_is_amsdu_allowed(priv, tid) &&
1453 			mwifiex_is_11n_aggragation_possible(priv, ptr,
1454 							adapter->tx_buf_size))
1455 			mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index);
1456 			/* ra_list_spinlock has been freed in
1457 			 * mwifiex_11n_aggregate_pkt()
1458 			 */
1459 		else
1460 			mwifiex_send_single_packet(priv, ptr, ptr_index);
1461 			/* ra_list_spinlock has been freed in
1462 			 * mwifiex_send_single_packet()
1463 			 */
1464 	} else {
1465 		if (mwifiex_is_ampdu_allowed(priv, ptr, tid) &&
1466 		    ptr->ba_pkt_count > ptr->ba_packet_thr) {
1467 			if (mwifiex_space_avail_for_new_ba_stream(adapter)) {
1468 				mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1469 						      BA_SETUP_INPROGRESS);
1470 				mwifiex_send_addba(priv, tid, ptr->ra);
1471 			} else if (mwifiex_find_stream_to_delete
1472 				   (priv, tid, &tid_del, ra)) {
1473 				mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1474 						      BA_SETUP_INPROGRESS);
1475 				mwifiex_send_delba(priv, tid_del, ra, 1);
1476 			}
1477 		}
1478 		if (mwifiex_is_amsdu_allowed(priv, tid) &&
1479 		    mwifiex_is_11n_aggragation_possible(priv, ptr,
1480 							adapter->tx_buf_size))
1481 			mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index);
1482 			/* ra_list_spinlock has been freed in
1483 			   mwifiex_11n_aggregate_pkt() */
1484 		else
1485 			mwifiex_send_single_packet(priv, ptr, ptr_index);
1486 			/* ra_list_spinlock has been freed in
1487 			   mwifiex_send_single_packet() */
1488 	}
1489 	return 0;
1490 }
1491 
1492 void mwifiex_process_bypass_tx(struct mwifiex_adapter *adapter)
1493 {
1494 	struct mwifiex_tx_param tx_param;
1495 	struct sk_buff *skb;
1496 	struct mwifiex_txinfo *tx_info;
1497 	struct mwifiex_private *priv;
1498 	int i;
1499 
1500 	if (adapter->data_sent || adapter->tx_lock_flag)
1501 		return;
1502 
1503 	for (i = 0; i < adapter->priv_num; ++i) {
1504 		priv = adapter->priv[i];
1505 
1506 		if (!priv)
1507 			continue;
1508 
1509 		if (adapter->if_ops.is_port_ready &&
1510 		    !adapter->if_ops.is_port_ready(priv))
1511 			continue;
1512 
1513 		if (skb_queue_empty(&priv->bypass_txq))
1514 			continue;
1515 
1516 		skb = skb_dequeue(&priv->bypass_txq);
1517 		tx_info = MWIFIEX_SKB_TXCB(skb);
1518 
1519 		/* no aggregation for bypass packets */
1520 		tx_param.next_pkt_len = 0;
1521 
1522 		if (mwifiex_process_tx(priv, skb, &tx_param) == -EBUSY) {
1523 			skb_queue_head(&priv->bypass_txq, skb);
1524 			tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1525 		} else {
1526 			atomic_dec(&adapter->bypass_tx_pending);
1527 		}
1528 	}
1529 }
1530 
1531 /*
1532  * This function transmits the highest priority packet awaiting in the
1533  * WMM Queues.
1534  */
1535 void
1536 mwifiex_wmm_process_tx(struct mwifiex_adapter *adapter)
1537 {
1538 	do {
1539 		if (mwifiex_dequeue_tx_packet(adapter))
1540 			break;
1541 		if (adapter->iface_type != MWIFIEX_SDIO) {
1542 			if (adapter->data_sent ||
1543 			    adapter->tx_lock_flag)
1544 				break;
1545 		} else {
1546 			if (atomic_read(&adapter->tx_queued) >=
1547 			    MWIFIEX_MAX_PKTS_TXQ)
1548 				break;
1549 		}
1550 	} while (!mwifiex_wmm_lists_empty(adapter));
1551 }
1552