1/*
  2 * Atheros CARL9170 driver
  3 *
  4 * Driver specific definitions
  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#ifndef __CARL9170_H
 40#define __CARL9170_H
 41
 42#include <linux/kernel.h>
 43#include <linux/firmware.h>
 44#include <linux/completion.h>
 45#include <linux/spinlock.h>
 46#include <linux/hw_random.h>
 47#include <net/cfg80211.h>
 48#include <net/mac80211.h>
 49#include <linux/usb.h>
 50#ifdef CONFIG_CARL9170_LEDS
 51#include <linux/leds.h>
 52#endif /* CONFIG_CARL9170_LEDS */
 53#ifdef CONFIG_CARL9170_WPC
 54#include <linux/input.h>
 55#endif /* CONFIG_CARL9170_WPC */
 56#include "eeprom.h"
 57#include "wlan.h"
 58#include "hw.h"
 59#include "fwdesc.h"
 60#include "fwcmd.h"
 61#include "../regd.h"
 62
 63#ifdef CONFIG_CARL9170_DEBUGFS
 64#include "debug.h"
 65#endif /* CONFIG_CARL9170_DEBUGFS */
 66
 67#define CARL9170FW_NAME	"carl9170-1.fw"
 68
 69#define PAYLOAD_MAX	(CARL9170_MAX_CMD_LEN / 4 - 1)
 70
 71static inline u8 ar9170_qmap(u8 idx)
 72{
 73	return 3 - idx; /* { 3, 2, 1, 0 } */
 74}
 75
 76#define CARL9170_MAX_RX_BUFFER_SIZE		8192
 77
 78enum carl9170_device_state {
 79	CARL9170_UNKNOWN_STATE,
 80	CARL9170_STOPPED,
 81	CARL9170_IDLE,
 82	CARL9170_STARTED,
 83};
 84
 85#define WME_BA_BMP_SIZE			64
 86#define CARL9170_TX_USER_RATE_TRIES	3
 87
 88#define TID_TO_WME_AC(_tid)				\
 89	((((_tid) == 0) || ((_tid) == 3)) ? IEEE80211_AC_BE :	\
 90	 (((_tid) == 1) || ((_tid) == 2)) ? IEEE80211_AC_BK :	\
 91	 (((_tid) == 4) || ((_tid) == 5)) ? IEEE80211_AC_VI :	\
 92	 IEEE80211_AC_VO)
 93
 94#define SEQ_DIFF(_start, _seq) \
 95	(((_start) - (_seq)) & 0x0fff)
 96#define SEQ_PREV(_seq) \
 97	(((_seq) - 1) & 0x0fff)
 98#define SEQ_NEXT(_seq) \
 99	(((_seq) + 1) & 0x0fff)
100#define BAW_WITHIN(_start, _bawsz, _seqno) \
101	((((_seqno) - (_start)) & 0xfff) < (_bawsz))
102
103enum carl9170_tid_state {
104	CARL9170_TID_STATE_INVALID,
105	CARL9170_TID_STATE_KILLED,
106	CARL9170_TID_STATE_SHUTDOWN,
107	CARL9170_TID_STATE_SUSPEND,
108	CARL9170_TID_STATE_PROGRESS,
109	CARL9170_TID_STATE_IDLE,
110	CARL9170_TID_STATE_XMIT,
111};
112
113#define CARL9170_BAW_BITS (2 * WME_BA_BMP_SIZE)
114#define CARL9170_BAW_SIZE (BITS_TO_LONGS(CARL9170_BAW_BITS))
115#define CARL9170_BAW_LEN (DIV_ROUND_UP(CARL9170_BAW_BITS, BITS_PER_BYTE))
116
117struct carl9170_sta_tid {
118	/* must be the first entry! */
119	struct list_head list;
120
121	/* temporary list for RCU unlink procedure */
122	struct list_head tmp_list;
123
124	/* lock for the following data structures */
125	spinlock_t lock;
126
127	unsigned int counter;
128	enum carl9170_tid_state state;
129	u8 tid;		/* TID number ( 0 - 15 ) */
130	u16 max;	/* max. AMPDU size */
131
132	u16 snx;	/* awaiting _next_ frame */
133	u16 hsn;	/* highest _queued_ sequence */
134	u16 bsn;	/* base of the tx/agg bitmap */
135	unsigned long bitmap[CARL9170_BAW_SIZE];
136
137	/* Preaggregation reorder queue */
138	struct sk_buff_head queue;
139
140	struct ieee80211_sta *sta;
141	struct ieee80211_vif *vif;
142};
143
144#define CARL9170_QUEUE_TIMEOUT		256
145#define CARL9170_BUMP_QUEUE		1000
146#define CARL9170_TX_TIMEOUT		2500
147#define CARL9170_JANITOR_DELAY		128
148#define CARL9170_QUEUE_STUCK_TIMEOUT	5500
149#define CARL9170_STAT_WORK		30000
150
151#define CARL9170_NUM_TX_AGG_MAX		30
152
153/*
154 * Tradeoff between stability/latency and speed.
155 *
156 * AR9170_TXQ_DEPTH is devised by dividing the amount of available
157 * tx buffers with the size of a full ethernet frame + overhead.
158 *
159 * Naturally: The higher the limit, the faster the device CAN send.
160 * However, even a slight over-commitment at the wrong time and the
161 * hardware is doomed to send all already-queued frames at suboptimal
162 * rates. This in turn leads to an enormous amount of unsuccessful
163 * retries => Latency goes up, whereas the throughput goes down. CRASH!
164 */
165#define CARL9170_NUM_TX_LIMIT_HARD	((AR9170_TXQ_DEPTH * 3) / 2)
166#define CARL9170_NUM_TX_LIMIT_SOFT	(AR9170_TXQ_DEPTH)
167
168struct carl9170_tx_queue_stats {
169	unsigned int count;
170	unsigned int limit;
171	unsigned int len;
172};
173
174struct carl9170_vif {
175	unsigned int id;
176	struct ieee80211_vif __rcu *vif;
177};
178
179struct carl9170_vif_info {
180	struct list_head list;
181	bool active;
182	unsigned int id;
183	struct sk_buff *beacon;
184	bool enable_beacon;
185};
186
187#define AR9170_NUM_RX_URBS	16
188#define AR9170_NUM_RX_URBS_MUL	2
189#define AR9170_NUM_TX_URBS	8
190#define AR9170_NUM_RX_URBS_POOL (AR9170_NUM_RX_URBS_MUL * AR9170_NUM_RX_URBS)
191
192enum carl9170_device_features {
193	CARL9170_WPS_BUTTON		= BIT(0),
194	CARL9170_ONE_LED		= BIT(1),
195};
196
197#ifdef CONFIG_CARL9170_LEDS
198struct ar9170;
199
200struct carl9170_led {
201	struct ar9170 *ar;
202	struct led_classdev l;
203	char name[32];
204	unsigned int toggled;
205	bool last_state;
206	bool registered;
207};
208#endif /* CONFIG_CARL9170_LEDS */
209
210enum carl9170_restart_reasons {
211	CARL9170_RR_NO_REASON = 0,
212	CARL9170_RR_FATAL_FIRMWARE_ERROR,
213	CARL9170_RR_TOO_MANY_FIRMWARE_ERRORS,
214	CARL9170_RR_WATCHDOG,
215	CARL9170_RR_STUCK_TX,
216	CARL9170_RR_UNRESPONSIVE_DEVICE,
217	CARL9170_RR_COMMAND_TIMEOUT,
218	CARL9170_RR_TOO_MANY_PHY_ERRORS,
219	CARL9170_RR_LOST_RSP,
220	CARL9170_RR_INVALID_RSP,
221	CARL9170_RR_USER_REQUEST,
222
223	__CARL9170_RR_LAST,
224};
225
226enum carl9170_erp_modes {
227	CARL9170_ERP_INVALID,
228	CARL9170_ERP_AUTO,
229	CARL9170_ERP_MAC80211,
230	CARL9170_ERP_OFF,
231	CARL9170_ERP_CTS,
232	CARL9170_ERP_RTS,
233	__CARL9170_ERP_NUM,
234};
235
236struct ar9170 {
237	struct ath_common common;
238	struct ieee80211_hw *hw;
239	struct mutex mutex;
240	enum carl9170_device_state state;
241	spinlock_t state_lock;
242	enum carl9170_restart_reasons last_reason;
243	bool registered;
244
245	/* USB */
246	struct usb_device *udev;
247	struct usb_interface *intf;
248	struct usb_anchor rx_anch;
249	struct usb_anchor rx_work;
250	struct usb_anchor rx_pool;
251	struct usb_anchor tx_wait;
252	struct usb_anchor tx_anch;
253	struct usb_anchor tx_cmd;
254	struct usb_anchor tx_err;
255	struct tasklet_struct usb_tasklet;
256	atomic_t tx_cmd_urbs;
257	atomic_t tx_anch_urbs;
258	atomic_t rx_anch_urbs;
259	atomic_t rx_work_urbs;
260	atomic_t rx_pool_urbs;
261	kernel_ulong_t features;
262	bool usb_ep_cmd_is_bulk;
263
264	/* firmware settings */
265	struct completion fw_load_wait;
266	struct completion fw_boot_wait;
267	struct {
268		const struct carl9170fw_desc_head *desc;
269		const struct firmware *fw;
270		unsigned int offset;
271		unsigned int address;
272		unsigned int cmd_bufs;
273		unsigned int api_version;
274		unsigned int vif_num;
275		unsigned int err_counter;
276		unsigned int bug_counter;
277		u32 beacon_addr;
278		unsigned int beacon_max_len;
279		bool rx_stream;
280		bool tx_stream;
281		bool rx_filter;
282		bool hw_counters;
283		unsigned int mem_blocks;
284		unsigned int mem_block_size;
285		unsigned int rx_size;
286		unsigned int tx_seq_table;
287		bool ba_filter;
288		bool disable_offload_fw;
289	} fw;
290
291	/* interface configuration combinations */
292	struct ieee80211_iface_limit if_comb_limits[1];
293	struct ieee80211_iface_combination if_combs[1];
294
295	/* reset / stuck frames/queue detection */
296	struct work_struct restart_work;
297	struct work_struct ping_work;
298	unsigned int restart_counter;
299	unsigned long queue_stop_timeout[__AR9170_NUM_TXQ];
300	unsigned long max_queue_stop_timeout[__AR9170_NUM_TXQ];
301	bool needs_full_reset;
302	bool force_usb_reset;
303	atomic_t pending_restarts;
304
305	/* interface mode settings */
306	struct list_head vif_list;
307	unsigned long vif_bitmap;
308	unsigned int vifs;
309	struct carl9170_vif vif_priv[AR9170_MAX_VIRTUAL_MAC];
310
311	/* beaconing */
312	spinlock_t beacon_lock;
313	unsigned int global_pretbtt;
314	unsigned int global_beacon_int;
315	struct carl9170_vif_info __rcu *beacon_iter;
316	unsigned int beacon_enabled;
317
318	/* cryptographic engine */
319	u64 usedkeys;
320	bool rx_software_decryption;
321	bool disable_offload;
322
323	/* filter settings */
324	u64 cur_mc_hash;
325	u32 cur_filter;
326	unsigned int filter_state;
327	unsigned int rx_filter_caps;
328	bool sniffer_enabled;
329
330	/* MAC */
331	enum carl9170_erp_modes erp_mode;
332
333	/* PHY */
334	struct ieee80211_channel *channel;
335	unsigned int num_channels;
336	int noise[4];
337	unsigned int chan_fail;
338	unsigned int total_chan_fail;
339	u8 heavy_clip;
340	u8 ht_settings;
341	struct {
342		u64 active;	/* usec */
343		u64 cca;	/* usec */
344		u64 tx_time;	/* usec */
345		u64 rx_total;
346		u64 rx_overrun;
347	} tally;
348	struct delayed_work stat_work;
349	struct survey_info *survey;
350
351	/* power calibration data */
352	u8 power_5G_leg[4];
353	u8 power_2G_cck[4];
354	u8 power_2G_ofdm[4];
355	u8 power_5G_ht20[8];
356	u8 power_5G_ht40[8];
357	u8 power_2G_ht20[8];
358	u8 power_2G_ht40[8];
359
360#ifdef CONFIG_CARL9170_LEDS
361	/* LED */
362	struct delayed_work led_work;
363	struct carl9170_led leds[AR9170_NUM_LEDS];
364#endif /* CONFIG_CARL9170_LEDS */
365
366	/* qos queue settings */
367	spinlock_t tx_stats_lock;
368	struct carl9170_tx_queue_stats tx_stats[__AR9170_NUM_TXQ];
369	struct ieee80211_tx_queue_params edcf[5];
370	struct completion tx_flush;
371
372	/* CMD */
373	int cmd_seq;
374	int readlen;
375	u8 *readbuf;
376	spinlock_t cmd_lock;
377	struct completion cmd_wait;
378	union {
379		__le32 cmd_buf[PAYLOAD_MAX + 1];
380		struct carl9170_cmd cmd;
381		struct carl9170_rsp rsp;
382	};
383
384	/* statistics */
385	unsigned int tx_dropped;
386	unsigned int tx_ack_failures;
387	unsigned int tx_fcs_errors;
388	unsigned int rx_dropped;
389
390	/* EEPROM */
391	struct ar9170_eeprom eeprom;
392
393	/* tx queuing */
394	struct sk_buff_head tx_pending[__AR9170_NUM_TXQ];
395	struct sk_buff_head tx_status[__AR9170_NUM_TXQ];
396	struct delayed_work tx_janitor;
397	unsigned long tx_janitor_last_run;
398	bool tx_schedule;
399
400	/* tx ampdu */
401	struct work_struct ampdu_work;
402	spinlock_t tx_ampdu_list_lock;
403	struct carl9170_sta_tid __rcu *tx_ampdu_iter;
404	struct list_head tx_ampdu_list;
405	atomic_t tx_ampdu_upload;
406	atomic_t tx_ampdu_scheduler;
407	atomic_t tx_total_pending;
408	atomic_t tx_total_queued;
409	unsigned int tx_ampdu_list_len;
410	int current_density;
411	int current_factor;
412	bool tx_ampdu_schedule;
413
414	/* internal memory management */
415	spinlock_t mem_lock;
416	unsigned long *mem_bitmap;
417	atomic_t mem_free_blocks;
418	atomic_t mem_allocs;
419
420	/* rxstream mpdu merge */
421	struct ar9170_rx_head rx_plcp;
422	bool rx_has_plcp;
423	struct sk_buff *rx_failover;
424	int rx_failover_missing;
425	u32 ampdu_ref;
426
427	/* FIFO for collecting outstanding BlockAckRequest */
428	struct list_head bar_list[__AR9170_NUM_TXQ];
429	spinlock_t bar_list_lock[__AR9170_NUM_TXQ];
430
431#ifdef CONFIG_CARL9170_WPC
432	struct {
433		bool pbc_state;
434		struct input_dev *pbc;
435		char name[32];
436		char phys[32];
437	} wps;
438#endif /* CONFIG_CARL9170_WPC */
439
440#ifdef CONFIG_CARL9170_DEBUGFS
441	struct carl9170_debug debug;
442	struct dentry *debug_dir;
443#endif /* CONFIG_CARL9170_DEBUGFS */
444
445	/* PSM */
446	struct work_struct ps_work;
447	struct {
448		unsigned int dtim_counter;
449		unsigned long last_beacon;
450		unsigned long last_action;
451		unsigned long last_slept;
452		unsigned int sleep_ms;
453		unsigned int off_override;
454		bool state;
455	} ps;
456
457#ifdef CONFIG_CARL9170_HWRNG
458# define CARL9170_HWRNG_CACHE_SIZE	CARL9170_MAX_CMD_PAYLOAD_LEN
459	struct {
460		struct hwrng rng;
461		char name[30 + 1];
462		u16 cache[CARL9170_HWRNG_CACHE_SIZE / sizeof(u16)];
463		unsigned int cache_idx;
464	} rng;
465#endif /* CONFIG_CARL9170_HWRNG */
466};
467
468enum carl9170_ps_off_override_reasons {
469	PS_OFF_VIF	= BIT(0),
470	PS_OFF_BCN	= BIT(1),
471};
472
473struct carl9170_bar_list_entry {
474	struct list_head list;
475	struct rcu_head head;
476	struct sk_buff *skb;
477};
478
479struct carl9170_ba_stats {
480	u8 ampdu_len;
481	u8 ampdu_ack_len;
482	bool clear;
483	bool req;
484};
485
486struct carl9170_sta_info {
487	bool ht_sta;
488	bool sleeping;
489	atomic_t pending_frames;
490	unsigned int ampdu_max_len;
491	struct carl9170_sta_tid __rcu *agg[IEEE80211_NUM_TIDS];
492	struct carl9170_ba_stats stats[IEEE80211_NUM_TIDS];
493};
494
495struct carl9170_tx_info {
496	unsigned long timeout;
497	struct ar9170 *ar;
498	struct kref ref;
499};
500
501#define CHK_DEV_STATE(a, s)	(((struct ar9170 *)a)->state >= (s))
502#define IS_INITIALIZED(a)	(CHK_DEV_STATE(a, CARL9170_STOPPED))
503#define IS_ACCEPTING_CMD(a)	(CHK_DEV_STATE(a, CARL9170_IDLE))
504#define IS_STARTED(a)		(CHK_DEV_STATE(a, CARL9170_STARTED))
505
506static inline void __carl9170_set_state(struct ar9170 *ar,
507	enum carl9170_device_state newstate)
508{
509	ar->state = newstate;
510}
511
512static inline void carl9170_set_state(struct ar9170 *ar,
513	enum carl9170_device_state newstate)
514{
515	unsigned long flags;
516
517	spin_lock_irqsave(&ar->state_lock, flags);
518	__carl9170_set_state(ar, newstate);
519	spin_unlock_irqrestore(&ar->state_lock, flags);
520}
521
522static inline void carl9170_set_state_when(struct ar9170 *ar,
523	enum carl9170_device_state min, enum carl9170_device_state newstate)
524{
525	unsigned long flags;
526
527	spin_lock_irqsave(&ar->state_lock, flags);
528	if (CHK_DEV_STATE(ar, min))
529		__carl9170_set_state(ar, newstate);
530	spin_unlock_irqrestore(&ar->state_lock, flags);
531}
532
533/* exported interface */
534void *carl9170_alloc(size_t priv_size);
535int carl9170_register(struct ar9170 *ar);
536void carl9170_unregister(struct ar9170 *ar);
537void carl9170_free(struct ar9170 *ar);
538void carl9170_restart(struct ar9170 *ar, const enum carl9170_restart_reasons r);
539void carl9170_ps_check(struct ar9170 *ar);
540
541/* USB back-end */
542int carl9170_usb_open(struct ar9170 *ar);
543void carl9170_usb_stop(struct ar9170 *ar);
544void carl9170_usb_tx(struct ar9170 *ar, struct sk_buff *skb);
545void carl9170_usb_handle_tx_err(struct ar9170 *ar);
546int carl9170_exec_cmd(struct ar9170 *ar, const enum carl9170_cmd_oids,
547		      u32 plen, void *payload, u32 rlen, void *resp);
548int __carl9170_exec_cmd(struct ar9170 *ar, struct carl9170_cmd *cmd,
549			const bool free_buf);
550int carl9170_usb_restart(struct ar9170 *ar);
551void carl9170_usb_reset(struct ar9170 *ar);
552
553/* MAC */
554int carl9170_init_mac(struct ar9170 *ar);
555int carl9170_set_qos(struct ar9170 *ar);
556int carl9170_update_multicast(struct ar9170 *ar, const u64 mc_hast);
557int carl9170_mod_virtual_mac(struct ar9170 *ar, const unsigned int id,
558			     const u8 *mac);
559int carl9170_set_operating_mode(struct ar9170 *ar);
560int carl9170_set_beacon_timers(struct ar9170 *ar);
561int carl9170_set_dyn_sifs_ack(struct ar9170 *ar);
562int carl9170_set_rts_cts_rate(struct ar9170 *ar);
563int carl9170_set_ampdu_settings(struct ar9170 *ar);
564int carl9170_set_slot_time(struct ar9170 *ar);
565int carl9170_set_mac_rates(struct ar9170 *ar);
566int carl9170_set_hwretry_limit(struct ar9170 *ar, const u32 max_retry);
567int carl9170_upload_key(struct ar9170 *ar, const u8 id, const u8 *mac,
568	const u8 ktype, const u8 keyidx, const u8 *keydata, const int keylen);
569int carl9170_disable_key(struct ar9170 *ar, const u8 id);
570int carl9170_set_mac_tpc(struct ar9170 *ar, struct ieee80211_channel *channel);
571
572/* RX */
573void carl9170_rx(struct ar9170 *ar, void *buf, unsigned int len);
574void carl9170_handle_command_response(struct ar9170 *ar, void *buf, u32 len);
575
576/* TX */
577void carl9170_op_tx(struct ieee80211_hw *hw,
578		    struct ieee80211_tx_control *control,
579		    struct sk_buff *skb);
580void carl9170_tx_janitor(struct work_struct *work);
581void carl9170_tx_process_status(struct ar9170 *ar,
582				const struct carl9170_rsp *cmd);
583void carl9170_tx_status(struct ar9170 *ar, struct sk_buff *skb,
584			const bool success);
585void carl9170_tx_callback(struct ar9170 *ar, struct sk_buff *skb);
586void carl9170_tx_drop(struct ar9170 *ar, struct sk_buff *skb);
587void carl9170_tx_scheduler(struct ar9170 *ar);
588void carl9170_tx_get_skb(struct sk_buff *skb);
589int carl9170_tx_put_skb(struct sk_buff *skb);
590int carl9170_update_beacon(struct ar9170 *ar, const bool submit);
591
592/* LEDs */
593#ifdef CONFIG_CARL9170_LEDS
594int carl9170_led_register(struct ar9170 *ar);
595void carl9170_led_unregister(struct ar9170 *ar);
596#endif /* CONFIG_CARL9170_LEDS */
597int carl9170_led_init(struct ar9170 *ar);
598int carl9170_led_set_state(struct ar9170 *ar, const u32 led_state);
599
600/* PHY / RF */
601int carl9170_set_channel(struct ar9170 *ar, struct ieee80211_channel *channel,
602			 enum nl80211_channel_type bw);
603int carl9170_get_noisefloor(struct ar9170 *ar);
604
605/* FW */
606int carl9170_parse_firmware(struct ar9170 *ar);
607
608extern struct ieee80211_rate __carl9170_ratetable[];
609extern int modparam_noht;
610
611static inline struct ar9170 *carl9170_get_priv(struct carl9170_vif *carl_vif)
612{
613	return container_of(carl_vif, struct ar9170,
614			    vif_priv[carl_vif->id]);
615}
616
617static inline struct ieee80211_hdr *carl9170_get_hdr(struct sk_buff *skb)
618{
619	return (void *)((struct _carl9170_tx_superframe *)
620		skb->data)->frame_data;
621}
622
623static inline u16 get_seq_h(struct ieee80211_hdr *hdr)
624{
625	return le16_to_cpu(hdr->seq_ctrl) >> 4;
626}
627
628static inline u16 carl9170_get_seq(struct sk_buff *skb)
629{
630	return get_seq_h(carl9170_get_hdr(skb));
631}
632
633static inline u16 carl9170_get_tid(struct sk_buff *skb)
634{
635	return ieee80211_get_tid(carl9170_get_hdr(skb));
636}
637
638static inline struct ieee80211_vif *
639carl9170_get_vif(struct carl9170_vif_info *priv)
640{
641	return container_of((void *)priv, struct ieee80211_vif, drv_priv);
642}
643
644/* Protected by ar->mutex or RCU */
645static inline struct ieee80211_vif *carl9170_get_main_vif(struct ar9170 *ar)
646{
647	struct carl9170_vif_info *cvif;
648
649	list_for_each_entry_rcu(cvif, &ar->vif_list, list) {
650		if (cvif->active)
651			return carl9170_get_vif(cvif);
652	}
653
654	return NULL;
655}
656
657static inline bool is_main_vif(struct ar9170 *ar, struct ieee80211_vif *vif)
658{
659	bool ret;
660
661	rcu_read_lock();
662	ret = (carl9170_get_main_vif(ar) == vif);
663	rcu_read_unlock();
664	return ret;
665}
666
667#endif /* __CARL9170_H */