2 * mac80211 <-> driver interface
4 * Copyright 2002-2005, Devicescape Software, Inc.
5 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
6 * Copyright 2007-2008 Johannes Berg <johannes@sipsolutions.net>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
16 #include <linux/kernel.h>
17 #include <linux/if_ether.h>
18 #include <linux/skbuff.h>
19 #include <linux/wireless.h>
20 #include <linux/device.h>
21 #include <linux/ieee80211.h>
22 #include <net/wireless.h>
23 #include <net/cfg80211.h>
28 * mac80211 is the Linux stack for 802.11 hardware that implements
29 * only partial functionality in hard- or firmware. This document
30 * defines the interface between mac80211 and low-level hardware
35 * DOC: Calling mac80211 from interrupts
37 * Only ieee80211_tx_status_irqsafe() and ieee80211_rx_irqsafe() can be
38 * called in hardware interrupt context. The low-level driver must not call any
39 * other functions in hardware interrupt context. If there is a need for such
40 * call, the low-level driver should first ACK the interrupt and perform the
41 * IEEE 802.11 code call after this, e.g. from a scheduled workqueue or even
44 * NOTE: If the driver opts to use the _irqsafe() functions, it may not also
45 * use the non-IRQ-safe functions!
51 * If you're reading this document and not the header file itself, it will
52 * be incomplete because not all documentation has been converted yet.
58 * As a general rule, when frames are passed between mac80211 and the driver,
59 * they start with the IEEE 802.11 header and include the same octets that are
60 * sent over the air except for the FCS which should be calculated by the
63 * There are, however, various exceptions to this rule for advanced features:
65 * The first exception is for hardware encryption and decryption offload
66 * where the IV/ICV may or may not be generated in hardware.
68 * Secondly, when the hardware handles fragmentation, the frame handed to
69 * the driver from mac80211 is the MSDU, not the MPDU.
71 * Finally, for received frames, the driver is able to indicate that it has
72 * filled a radiotap header and put that in front of the frame; if it does
73 * not do so then mac80211 may add this under certain circumstances.
77 * struct ieee80211_ht_bss_info - describing BSS's HT characteristics
79 * This structure describes most essential parameters needed
80 * to describe 802.11n HT characteristics in a BSS.
82 * @primary_channel: channel number of primery channel
83 * @bss_cap: 802.11n's general BSS capabilities (e.g. channel width)
84 * @bss_op_mode: 802.11n's BSS operation modes (e.g. HT protection)
86 struct ieee80211_ht_bss_info {
88 u8 bss_cap; /* use IEEE80211_HT_IE_CHA_ */
89 u8 bss_op_mode; /* use IEEE80211_HT_IE_ */
93 * enum ieee80211_max_queues - maximum number of queues
95 * @IEEE80211_MAX_QUEUES: Maximum number of regular device queues.
96 * @IEEE80211_MAX_AMPDU_QUEUES: Maximum number of queues usable
97 * for A-MPDU operation.
99 enum ieee80211_max_queues {
100 IEEE80211_MAX_QUEUES = 16,
101 IEEE80211_MAX_AMPDU_QUEUES = 16,
105 * struct ieee80211_tx_queue_params - transmit queue configuration
107 * The information provided in this structure is required for QoS
108 * transmit queue configuration. Cf. IEEE 802.11 7.3.2.29.
110 * @aifs: arbitration interframe space [0..255]
111 * @cw_min: minimum contention window [a value of the form
112 * 2^n-1 in the range 1..32767]
113 * @cw_max: maximum contention window [like @cw_min]
114 * @txop: maximum burst time in units of 32 usecs, 0 meaning disabled
116 struct ieee80211_tx_queue_params {
124 * struct ieee80211_tx_queue_stats - transmit queue statistics
126 * @len: number of packets in queue
127 * @limit: queue length limit
128 * @count: number of frames sent
130 struct ieee80211_tx_queue_stats {
136 struct ieee80211_low_level_stats {
137 unsigned int dot11ACKFailureCount;
138 unsigned int dot11RTSFailureCount;
139 unsigned int dot11FCSErrorCount;
140 unsigned int dot11RTSSuccessCount;
144 * enum ieee80211_bss_change - BSS change notification flags
146 * These flags are used with the bss_info_changed() callback
147 * to indicate which BSS parameter changed.
149 * @BSS_CHANGED_ASSOC: association status changed (associated/disassociated),
150 * also implies a change in the AID.
151 * @BSS_CHANGED_ERP_CTS_PROT: CTS protection changed
152 * @BSS_CHANGED_ERP_PREAMBLE: preamble changed
153 * @BSS_CHANGED_ERP_SLOT: slot timing changed
154 * @BSS_CHANGED_HT: 802.11n parameters changed
155 * @BSS_CHANGED_BASIC_RATES: Basic rateset changed
157 enum ieee80211_bss_change {
158 BSS_CHANGED_ASSOC = 1<<0,
159 BSS_CHANGED_ERP_CTS_PROT = 1<<1,
160 BSS_CHANGED_ERP_PREAMBLE = 1<<2,
161 BSS_CHANGED_ERP_SLOT = 1<<3,
162 BSS_CHANGED_HT = 1<<4,
163 BSS_CHANGED_BASIC_RATES = 1<<5,
167 * struct ieee80211_bss_ht_conf - BSS's changing HT configuration
168 * @operation_mode: HT operation mode (like in &struct ieee80211_ht_info)
170 struct ieee80211_bss_ht_conf {
175 * struct ieee80211_bss_conf - holds the BSS's changing parameters
177 * This structure keeps information about a BSS (and an association
178 * to that BSS) that can change during the lifetime of the BSS.
180 * @assoc: association status
181 * @aid: association ID number, valid only when @assoc is true
182 * @use_cts_prot: use CTS protection
183 * @use_short_preamble: use 802.11b short preamble;
184 * if the hardware cannot handle this it must set the
185 * IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE hardware flag
186 * @use_short_slot: use short slot time (only relevant for ERP);
187 * if the hardware cannot handle this it must set the
188 * IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE hardware flag
189 * @dtim_period: num of beacons before the next DTIM, for PSM
190 * @timestamp: beacon timestamp
191 * @beacon_int: beacon interval
192 * @assoc_capability: capabilities taken from assoc resp
193 * @ht: BSS's HT configuration
194 * @basic_rates: bitmap of basic rates, each bit stands for an
195 * index into the rate table configured by the driver in
198 struct ieee80211_bss_conf {
199 /* association related data */
202 /* erp related data */
204 bool use_short_preamble;
208 u16 assoc_capability;
211 struct ieee80211_bss_ht_conf ht;
215 * enum mac80211_tx_control_flags - flags to describe transmission information/status
217 * These flags are used with the @flags member of &ieee80211_tx_info.
219 * @IEEE80211_TX_CTL_REQ_TX_STATUS: request TX status callback for this frame.
220 * @IEEE80211_TX_CTL_ASSIGN_SEQ: The driver has to assign a sequence
221 * number to this frame, taking care of not overwriting the fragment
222 * number and increasing the sequence number only when the
223 * IEEE80211_TX_CTL_FIRST_FRAGMENT flag is set. mac80211 will properly
224 * assign sequence numbers to QoS-data frames but cannot do so correctly
225 * for non-QoS-data and management frames because beacons need them from
226 * that counter as well and mac80211 cannot guarantee proper sequencing.
227 * If this flag is set, the driver should instruct the hardware to
228 * assign a sequence number to the frame or assign one itself. Cf. IEEE
229 * 802.11-2007 7.1.3.4.1 paragraph 3. This flag will always be set for
230 * beacons and always be clear for frames without a sequence number field.
231 * @IEEE80211_TX_CTL_NO_ACK: tell the low level not to wait for an ack
232 * @IEEE80211_TX_CTL_CLEAR_PS_FILT: clear powersave filter for destination
234 * @IEEE80211_TX_CTL_FIRST_FRAGMENT: this is a first fragment of the frame
235 * @IEEE80211_TX_CTL_SEND_AFTER_DTIM: send this frame after DTIM beacon
236 * @IEEE80211_TX_CTL_AMPDU: this frame should be sent as part of an A-MPDU
237 * @IEEE80211_TX_CTL_INJECTED: Frame was injected, internal to mac80211.
238 * @IEEE80211_TX_STAT_TX_FILTERED: The frame was not transmitted
239 * because the destination STA was in powersave mode.
240 * @IEEE80211_TX_STAT_ACK: Frame was acknowledged
241 * @IEEE80211_TX_STAT_AMPDU: The frame was aggregated, so status
242 * is for the whole aggregation.
243 * @IEEE80211_TX_STAT_AMPDU_NO_BACK: no block ack was returned,
244 * so consider using block ack request (BAR).
245 * @IEEE80211_TX_CTL_RATE_CTRL_PROBE: internal to mac80211, can be
246 * set by rate control algorithms to indicate probe rate, will
247 * be cleared for fragmented frames (except on the last fragment)
249 enum mac80211_tx_control_flags {
250 IEEE80211_TX_CTL_REQ_TX_STATUS = BIT(0),
251 IEEE80211_TX_CTL_ASSIGN_SEQ = BIT(1),
252 IEEE80211_TX_CTL_NO_ACK = BIT(2),
253 IEEE80211_TX_CTL_CLEAR_PS_FILT = BIT(3),
254 IEEE80211_TX_CTL_FIRST_FRAGMENT = BIT(4),
255 IEEE80211_TX_CTL_SEND_AFTER_DTIM = BIT(5),
256 IEEE80211_TX_CTL_AMPDU = BIT(6),
257 IEEE80211_TX_CTL_INJECTED = BIT(7),
258 IEEE80211_TX_STAT_TX_FILTERED = BIT(8),
259 IEEE80211_TX_STAT_ACK = BIT(9),
260 IEEE80211_TX_STAT_AMPDU = BIT(10),
261 IEEE80211_TX_STAT_AMPDU_NO_BACK = BIT(11),
262 IEEE80211_TX_CTL_RATE_CTRL_PROBE = BIT(12),
265 enum mac80211_rate_control_flags {
266 IEEE80211_TX_RC_USE_RTS_CTS = BIT(0),
267 IEEE80211_TX_RC_USE_CTS_PROTECT = BIT(1),
268 IEEE80211_TX_RC_USE_SHORT_PREAMBLE = BIT(2),
270 /* rate index is an MCS rate number instead of an index */
271 IEEE80211_TX_RC_MCS = BIT(3),
272 IEEE80211_TX_RC_GREEN_FIELD = BIT(4),
273 IEEE80211_TX_RC_40_MHZ_WIDTH = BIT(5),
274 IEEE80211_TX_RC_DUP_DATA = BIT(6),
275 IEEE80211_TX_RC_SHORT_GI = BIT(7),
279 /* there are 40 bytes if you don't need the rateset to be kept */
280 #define IEEE80211_TX_INFO_DRIVER_DATA_SIZE 40
282 /* if you do need the rateset, then you have less space */
283 #define IEEE80211_TX_INFO_RATE_DRIVER_DATA_SIZE 24
285 /* maximum number of rate stages */
286 #define IEEE80211_TX_MAX_RATES 5
289 * struct ieee80211_tx_rate - rate selection/status
291 * @idx: rate index to attempt to send with
292 * @flags: rate control flags (&enum mac80211_rate_control_flags)
293 * @count: number of tries in this rate before going to the next rate
295 * A value of -1 for @idx indicates an invalid rate and, if used
296 * in an array of retry rates, that no more rates should be tried.
298 * When used for transmit status reporting, the driver should
299 * always report the rate along with the flags it used.
301 struct ieee80211_tx_rate {
305 } __attribute__((packed));
308 * struct ieee80211_tx_info - skb transmit information
310 * This structure is placed in skb->cb for three uses:
311 * (1) mac80211 TX control - mac80211 tells the driver what to do
312 * (2) driver internal use (if applicable)
313 * (3) TX status information - driver tells mac80211 what happened
315 * The TX control's sta pointer is only valid during the ->tx call,
318 * @flags: transmit info flags, defined above
319 * @band: the band to transmit on (use for checking for races)
320 * @antenna_sel_tx: antenna to use, 0 for automatic diversity
321 * @pad: padding, ignore
322 * @control: union for control data
323 * @status: union for status data
324 * @driver_data: array of driver_data pointers
325 * @ampdu_ack_len: number of aggregated frames.
326 * relevant only if IEEE80211_TX_STATUS_AMPDU was set.
327 * @ampdu_ack_map: block ack bit map for the aggregation.
328 * relevant only if IEEE80211_TX_STATUS_AMPDU was set.
329 * @ack_signal: signal strength of the ACK frame
331 struct ieee80211_tx_info {
332 /* common information */
346 struct ieee80211_tx_rate rates[
347 IEEE80211_TX_MAX_RATES];
350 /* only needed before rate control */
351 unsigned long jiffies;
353 /* NB: vif can be NULL for injected frames */
354 struct ieee80211_vif *vif;
355 struct ieee80211_key_conf *hw_key;
356 struct ieee80211_sta *sta;
359 struct ieee80211_tx_rate rates[IEEE80211_TX_MAX_RATES];
366 struct ieee80211_tx_rate driver_rates[
367 IEEE80211_TX_MAX_RATES];
368 void *rate_driver_data[
369 IEEE80211_TX_INFO_RATE_DRIVER_DATA_SIZE / sizeof(void *)];
372 IEEE80211_TX_INFO_DRIVER_DATA_SIZE / sizeof(void *)];
376 static inline struct ieee80211_tx_info *IEEE80211_SKB_CB(struct sk_buff *skb)
378 return (struct ieee80211_tx_info *)skb->cb;
382 * ieee80211_tx_info_clear_status - clear TX status
384 * @info: The &struct ieee80211_tx_info to be cleared.
386 * When the driver passes an skb back to mac80211, it must report
387 * a number of things in TX status. This function clears everything
388 * in the TX status but the rate control information (it does clear
389 * the count since you need to fill that in anyway).
391 * NOTE: You can only use this function if you do NOT use
392 * info->driver_data! Use info->rate_driver_data
393 * instead if you need only the less space that allows.
396 ieee80211_tx_info_clear_status(struct ieee80211_tx_info *info)
400 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, status.rates) !=
401 offsetof(struct ieee80211_tx_info, control.rates));
402 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, status.rates) !=
403 offsetof(struct ieee80211_tx_info, driver_rates));
404 BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, status.rates) != 8);
405 /* clear the rate counts */
406 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++)
407 info->status.rates[i].count = 0;
410 offsetof(struct ieee80211_tx_info, status.ampdu_ack_len) != 23);
411 memset(&info->status.ampdu_ack_len, 0,
412 sizeof(struct ieee80211_tx_info) -
413 offsetof(struct ieee80211_tx_info, status.ampdu_ack_len));
418 * enum mac80211_rx_flags - receive flags
420 * These flags are used with the @flag member of &struct ieee80211_rx_status.
421 * @RX_FLAG_MMIC_ERROR: Michael MIC error was reported on this frame.
422 * Use together with %RX_FLAG_MMIC_STRIPPED.
423 * @RX_FLAG_DECRYPTED: This frame was decrypted in hardware.
424 * @RX_FLAG_RADIOTAP: This frame starts with a radiotap header.
425 * @RX_FLAG_MMIC_STRIPPED: the Michael MIC is stripped off this frame,
426 * verification has been done by the hardware.
427 * @RX_FLAG_IV_STRIPPED: The IV/ICV are stripped from this frame.
428 * If this flag is set, the stack cannot do any replay detection
429 * hence the driver or hardware will have to do that.
430 * @RX_FLAG_FAILED_FCS_CRC: Set this flag if the FCS check failed on
432 * @RX_FLAG_FAILED_PLCP_CRC: Set this flag if the PCLP check failed on
434 * @RX_FLAG_TSFT: The timestamp passed in the RX status (@mactime field)
435 * is valid. This is useful in monitor mode and necessary for beacon frames
436 * to enable IBSS merging.
437 * @RX_FLAG_SHORTPRE: Short preamble was used for this frame
438 * @RX_FLAG_HT: HT MCS was used and rate_idx is MCS index
439 * @RX_FLAG_40MHZ: HT40 (40 MHz) was used
440 * @RX_FLAG_SHORT_GI: Short guard interval was used
442 enum mac80211_rx_flags {
443 RX_FLAG_MMIC_ERROR = 1<<0,
444 RX_FLAG_DECRYPTED = 1<<1,
445 RX_FLAG_RADIOTAP = 1<<2,
446 RX_FLAG_MMIC_STRIPPED = 1<<3,
447 RX_FLAG_IV_STRIPPED = 1<<4,
448 RX_FLAG_FAILED_FCS_CRC = 1<<5,
449 RX_FLAG_FAILED_PLCP_CRC = 1<<6,
451 RX_FLAG_SHORTPRE = 1<<8,
453 RX_FLAG_40MHZ = 1<<10,
454 RX_FLAG_SHORT_GI = 1<<11,
458 * struct ieee80211_rx_status - receive status
460 * The low-level driver should provide this information (the subset
461 * supported by hardware) to the 802.11 code with each received
464 * @mactime: value in microseconds of the 64-bit Time Synchronization Function
465 * (TSF) timer when the first data symbol (MPDU) arrived at the hardware.
466 * @band: the active band when this frame was received
467 * @freq: frequency the radio was tuned to when receiving this frame, in MHz
468 * @signal: signal strength when receiving this frame, either in dBm, in dB or
469 * unspecified depending on the hardware capabilities flags
470 * @IEEE80211_HW_SIGNAL_*
471 * @noise: noise when receiving this frame, in dBm.
472 * @qual: overall signal quality indication, in percent (0-100).
473 * @antenna: antenna used
474 * @rate_idx: index of data rate into band's supported rates or MCS index if
475 * HT rates are use (RX_FLAG_HT)
478 struct ieee80211_rx_status {
480 enum ieee80211_band band;
491 * enum ieee80211_conf_flags - configuration flags
493 * Flags to define PHY configuration options
495 * @IEEE80211_CONF_RADIOTAP: add radiotap header at receive time (if supported)
496 * @IEEE80211_CONF_PS: Enable 802.11 power save mode
498 enum ieee80211_conf_flags {
499 IEEE80211_CONF_RADIOTAP = (1<<0),
500 IEEE80211_CONF_PS = (1<<1),
503 /* XXX: remove all this once drivers stop trying to use it */
504 static inline int __deprecated __IEEE80211_CONF_SHORT_SLOT_TIME(void)
508 #define IEEE80211_CONF_SHORT_SLOT_TIME (__IEEE80211_CONF_SHORT_SLOT_TIME())
511 * enum ieee80211_conf_changed - denotes which configuration changed
513 * @IEEE80211_CONF_CHANGE_RADIO_ENABLED: the value of radio_enabled changed
514 * @IEEE80211_CONF_CHANGE_BEACON_INTERVAL: the beacon interval changed
515 * @IEEE80211_CONF_CHANGE_LISTEN_INTERVAL: the listen interval changed
516 * @IEEE80211_CONF_CHANGE_RADIOTAP: the radiotap flag changed
517 * @IEEE80211_CONF_CHANGE_PS: the PS flag changed
518 * @IEEE80211_CONF_CHANGE_DYNPS_TIMEOUT: the dynamic PS timeout changed
519 * @IEEE80211_CONF_CHANGE_POWER: the TX power changed
520 * @IEEE80211_CONF_CHANGE_CHANNEL: the channel/channel_type changed
521 * @IEEE80211_CONF_CHANGE_RETRY_LIMITS: retry limits changed
523 enum ieee80211_conf_changed {
524 IEEE80211_CONF_CHANGE_RADIO_ENABLED = BIT(0),
525 IEEE80211_CONF_CHANGE_BEACON_INTERVAL = BIT(1),
526 IEEE80211_CONF_CHANGE_LISTEN_INTERVAL = BIT(2),
527 IEEE80211_CONF_CHANGE_RADIOTAP = BIT(3),
528 IEEE80211_CONF_CHANGE_PS = BIT(4),
529 IEEE80211_CONF_CHANGE_DYNPS_TIMEOUT = BIT(5),
530 IEEE80211_CONF_CHANGE_POWER = BIT(6),
531 IEEE80211_CONF_CHANGE_CHANNEL = BIT(7),
532 IEEE80211_CONF_CHANGE_RETRY_LIMITS = BIT(8),
536 * struct ieee80211_conf - configuration of the device
538 * This struct indicates how the driver shall configure the hardware.
540 * @radio_enabled: when zero, driver is required to switch off the radio.
541 * @beacon_int: beacon interval (TODO make interface config)
542 * @listen_interval: listen interval in units of beacon interval
543 * @flags: configuration flags defined above
544 * @power_level: requested transmit power (in dBm)
545 * @dynamic_ps_timeout: dynamic powersave timeout (in ms)
546 * @channel: the channel to tune to
547 * @channel_type: the channel (HT) type
548 * @long_frame_max_tx_count: Maximum number of transmissions for a "long" frame
549 * (a frame not RTS protected), called "dot11LongRetryLimit" in 802.11,
550 * but actually means the number of transmissions not the number of retries
551 * @short_frame_max_tx_count: Maximum number of transmissions for a "short"
552 * frame, called "dot11ShortRetryLimit" in 802.11, but actually means the
553 * number of transmissions not the number of retries
555 struct ieee80211_conf {
558 int power_level, dynamic_ps_timeout;
563 u8 long_frame_max_tx_count, short_frame_max_tx_count;
565 struct ieee80211_channel *channel;
566 enum nl80211_channel_type channel_type;
570 * struct ieee80211_vif - per-interface data
572 * Data in this structure is continually present for driver
573 * use during the life of a virtual interface.
575 * @type: type of this virtual interface
576 * @bss_conf: BSS configuration for this interface, either our own
577 * or the BSS we're associated to
578 * @drv_priv: data area for driver use, will always be aligned to
581 struct ieee80211_vif {
582 enum nl80211_iftype type;
583 struct ieee80211_bss_conf bss_conf;
585 u8 drv_priv[0] __attribute__((__aligned__(sizeof(void *))));
588 static inline bool ieee80211_vif_is_mesh(struct ieee80211_vif *vif)
590 #ifdef CONFIG_MAC80211_MESH
591 return vif->type == NL80211_IFTYPE_MESH_POINT;
597 * struct ieee80211_if_init_conf - initial configuration of an interface
599 * @vif: pointer to a driver-use per-interface structure. The pointer
600 * itself is also used for various functions including
601 * ieee80211_beacon_get() and ieee80211_get_buffered_bc().
602 * @type: one of &enum nl80211_iftype constants. Determines the type of
603 * added/removed interface.
604 * @mac_addr: pointer to MAC address of the interface. This pointer is valid
605 * until the interface is removed (i.e. it cannot be used after
606 * remove_interface() callback was called for this interface).
608 * This structure is used in add_interface() and remove_interface()
609 * callbacks of &struct ieee80211_hw.
611 * When you allow multiple interfaces to be added to your PHY, take care
612 * that the hardware can actually handle multiple MAC addresses. However,
613 * also take care that when there's no interface left with mac_addr != %NULL
614 * you remove the MAC address from the device to avoid acknowledging packets
615 * in pure monitor mode.
617 struct ieee80211_if_init_conf {
618 enum nl80211_iftype type;
619 struct ieee80211_vif *vif;
624 * enum ieee80211_if_conf_change - interface config change flags
626 * @IEEE80211_IFCC_BSSID: The BSSID changed.
627 * @IEEE80211_IFCC_BEACON: The beacon for this interface changed
628 * (currently AP and MESH only), use ieee80211_beacon_get().
630 enum ieee80211_if_conf_change {
631 IEEE80211_IFCC_BSSID = BIT(0),
632 IEEE80211_IFCC_BEACON = BIT(1),
636 * struct ieee80211_if_conf - configuration of an interface
638 * @changed: parameters that have changed, see &enum ieee80211_if_conf_change.
639 * @bssid: BSSID of the network we are associated to/creating.
641 * This structure is passed to the config_interface() callback of
642 * &struct ieee80211_hw.
644 struct ieee80211_if_conf {
650 * enum ieee80211_key_alg - key algorithm
651 * @ALG_WEP: WEP40 or WEP104
653 * @ALG_CCMP: CCMP (AES)
655 enum ieee80211_key_alg {
662 * enum ieee80211_key_len - key length
663 * @LEN_WEP40: WEP 5-byte long key
664 * @LEN_WEP104: WEP 13-byte long key
666 enum ieee80211_key_len {
672 * enum ieee80211_key_flags - key flags
674 * These flags are used for communication about keys between the driver
675 * and mac80211, with the @flags parameter of &struct ieee80211_key_conf.
677 * @IEEE80211_KEY_FLAG_WMM_STA: Set by mac80211, this flag indicates
678 * that the STA this key will be used with could be using QoS.
679 * @IEEE80211_KEY_FLAG_GENERATE_IV: This flag should be set by the
680 * driver to indicate that it requires IV generation for this
682 * @IEEE80211_KEY_FLAG_GENERATE_MMIC: This flag should be set by
683 * the driver for a TKIP key if it requires Michael MIC
684 * generation in software.
685 * @IEEE80211_KEY_FLAG_PAIRWISE: Set by mac80211, this flag indicates
686 * that the key is pairwise rather then a shared key.
688 enum ieee80211_key_flags {
689 IEEE80211_KEY_FLAG_WMM_STA = 1<<0,
690 IEEE80211_KEY_FLAG_GENERATE_IV = 1<<1,
691 IEEE80211_KEY_FLAG_GENERATE_MMIC= 1<<2,
692 IEEE80211_KEY_FLAG_PAIRWISE = 1<<3,
696 * struct ieee80211_key_conf - key information
698 * This key information is given by mac80211 to the driver by
699 * the set_key() callback in &struct ieee80211_ops.
701 * @hw_key_idx: To be set by the driver, this is the key index the driver
702 * wants to be given when a frame is transmitted and needs to be
703 * encrypted in hardware.
704 * @alg: The key algorithm.
705 * @flags: key flags, see &enum ieee80211_key_flags.
706 * @keyidx: the key index (0-3)
707 * @keylen: key material length
708 * @key: key material. For ALG_TKIP the key is encoded as a 256-bit (32 byte)
710 * - Temporal Encryption Key (128 bits)
711 * - Temporal Authenticator Tx MIC Key (64 bits)
712 * - Temporal Authenticator Rx MIC Key (64 bits)
713 * @icv_len: The ICV length for this key type
714 * @iv_len: The IV length for this key type
716 struct ieee80211_key_conf {
717 enum ieee80211_key_alg alg;
728 * enum set_key_cmd - key command
730 * Used with the set_key() callback in &struct ieee80211_ops, this
731 * indicates whether a key is being removed or added.
733 * @SET_KEY: a key is set
734 * @DISABLE_KEY: a key must be disabled
737 SET_KEY, DISABLE_KEY,
741 * struct ieee80211_sta - station table entry
743 * A station table entry represents a station we are possibly
744 * communicating with. Since stations are RCU-managed in
745 * mac80211, any ieee80211_sta pointer you get access to must
746 * either be protected by rcu_read_lock() explicitly or implicitly,
747 * or you must take good care to not use such a pointer after a
748 * call to your sta_notify callback that removed it.
751 * @aid: AID we assigned to the station if we're an AP
752 * @supp_rates: Bitmap of supported rates (per band)
753 * @ht_cap: HT capabilities of this STA; restricted to our own TX capabilities
754 * @drv_priv: data area for driver use, will always be aligned to
755 * sizeof(void *), size is determined in hw information.
757 struct ieee80211_sta {
758 u64 supp_rates[IEEE80211_NUM_BANDS];
761 struct ieee80211_sta_ht_cap ht_cap;
764 u8 drv_priv[0] __attribute__((__aligned__(sizeof(void *))));
768 * enum sta_notify_cmd - sta notify command
770 * Used with the sta_notify() callback in &struct ieee80211_ops, this
771 * indicates addition and removal of a station to station table,
772 * or if a associated station made a power state transition.
774 * @STA_NOTIFY_ADD: a station was added to the station table
775 * @STA_NOTIFY_REMOVE: a station being removed from the station table
776 * @STA_NOTIFY_SLEEP: a station is now sleeping
777 * @STA_NOTIFY_AWAKE: a sleeping station woke up
779 enum sta_notify_cmd {
780 STA_NOTIFY_ADD, STA_NOTIFY_REMOVE,
781 STA_NOTIFY_SLEEP, STA_NOTIFY_AWAKE,
785 * enum ieee80211_tkip_key_type - get tkip key
787 * Used by drivers which need to get a tkip key for skb. Some drivers need a
788 * phase 1 key, others need a phase 2 key. A single function allows the driver
789 * to get the key, this enum indicates what type of key is required.
791 * @IEEE80211_TKIP_P1_KEY: the driver needs a phase 1 key
792 * @IEEE80211_TKIP_P2_KEY: the driver needs a phase 2 key
794 enum ieee80211_tkip_key_type {
795 IEEE80211_TKIP_P1_KEY,
796 IEEE80211_TKIP_P2_KEY,
800 * enum ieee80211_hw_flags - hardware flags
802 * These flags are used to indicate hardware capabilities to
803 * the stack. Generally, flags here should have their meaning
804 * done in a way that the simplest hardware doesn't need setting
805 * any particular flags. There are some exceptions to this rule,
806 * however, so you are advised to review these flags carefully.
808 * @IEEE80211_HW_RX_INCLUDES_FCS:
809 * Indicates that received frames passed to the stack include
810 * the FCS at the end.
812 * @IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING:
813 * Some wireless LAN chipsets buffer broadcast/multicast frames
814 * for power saving stations in the hardware/firmware and others
815 * rely on the host system for such buffering. This option is used
816 * to configure the IEEE 802.11 upper layer to buffer broadcast and
817 * multicast frames when there are power saving stations so that
818 * the driver can fetch them with ieee80211_get_buffered_bc().
820 * @IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE:
821 * Hardware is not capable of short slot operation on the 2.4 GHz band.
823 * @IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE:
824 * Hardware is not capable of receiving frames with short preamble on
827 * @IEEE80211_HW_SIGNAL_UNSPEC:
828 * Hardware can provide signal values but we don't know its units. We
829 * expect values between 0 and @max_signal.
830 * If possible please provide dB or dBm instead.
832 * @IEEE80211_HW_SIGNAL_DB:
833 * Hardware gives signal values in dB, decibel difference from an
834 * arbitrary, fixed reference. We expect values between 0 and @max_signal.
835 * If possible please provide dBm instead.
837 * @IEEE80211_HW_SIGNAL_DBM:
838 * Hardware gives signal values in dBm, decibel difference from
839 * one milliwatt. This is the preferred method since it is standardized
840 * between different devices. @max_signal does not need to be set.
842 * @IEEE80211_HW_NOISE_DBM:
843 * Hardware can provide noise (radio interference) values in units dBm,
844 * decibel difference from one milliwatt.
846 * @IEEE80211_HW_SPECTRUM_MGMT:
847 * Hardware supports spectrum management defined in 802.11h
848 * Measurement, Channel Switch, Quieting, TPC
850 * @IEEE80211_HW_AMPDU_AGGREGATION:
851 * Hardware supports 11n A-MPDU aggregation.
853 * @IEEE80211_HW_NO_STACK_DYNAMIC_PS:
854 * Hardware which has dynamic power save support, meaning
855 * that power save is enabled in idle periods, and don't need support
858 enum ieee80211_hw_flags {
859 IEEE80211_HW_RX_INCLUDES_FCS = 1<<1,
860 IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING = 1<<2,
861 IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE = 1<<3,
862 IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE = 1<<4,
863 IEEE80211_HW_SIGNAL_UNSPEC = 1<<5,
864 IEEE80211_HW_SIGNAL_DB = 1<<6,
865 IEEE80211_HW_SIGNAL_DBM = 1<<7,
866 IEEE80211_HW_NOISE_DBM = 1<<8,
867 IEEE80211_HW_SPECTRUM_MGMT = 1<<9,
868 IEEE80211_HW_AMPDU_AGGREGATION = 1<<10,
869 IEEE80211_HW_NO_STACK_DYNAMIC_PS = 1<<11,
873 * struct ieee80211_hw - hardware information and state
875 * This structure contains the configuration and hardware
876 * information for an 802.11 PHY.
878 * @wiphy: This points to the &struct wiphy allocated for this
879 * 802.11 PHY. You must fill in the @perm_addr and @dev
880 * members of this structure using SET_IEEE80211_DEV()
881 * and SET_IEEE80211_PERM_ADDR(). Additionally, all supported
882 * bands (with channels, bitrates) are registered here.
884 * @conf: &struct ieee80211_conf, device configuration, don't use.
886 * @workqueue: single threaded workqueue available for driver use,
887 * allocated by mac80211 on registration and flushed when an
888 * interface is removed.
889 * NOTICE: All work performed on this workqueue should NEVER
890 * acquire the RTNL lock (i.e. Don't use the function
891 * ieee80211_iterate_active_interfaces())
893 * @priv: pointer to private area that was allocated for driver use
894 * along with this structure.
896 * @flags: hardware flags, see &enum ieee80211_hw_flags.
898 * @extra_tx_headroom: headroom to reserve in each transmit skb
899 * for use by the driver (e.g. for transmit headers.)
901 * @channel_change_time: time (in microseconds) it takes to change channels.
903 * @max_signal: Maximum value for signal (rssi) in RX information, used
904 * only when @IEEE80211_HW_SIGNAL_UNSPEC or @IEEE80211_HW_SIGNAL_DB
906 * @max_listen_interval: max listen interval in units of beacon interval
909 * @queues: number of available hardware transmit queues for
910 * data packets. WMM/QoS requires at least four, these
911 * queues need to have configurable access parameters.
913 * @ampdu_queues: number of available hardware transmit queues
914 * for A-MPDU packets, these have no access parameters
915 * because they're used only for A-MPDU frames. Note that
916 * mac80211 will not currently use any of the regular queues
919 * @rate_control_algorithm: rate control algorithm for this hardware.
920 * If unset (NULL), the default algorithm will be used. Must be
921 * set before calling ieee80211_register_hw().
923 * @vif_data_size: size (in bytes) of the drv_priv data area
924 * within &struct ieee80211_vif.
925 * @sta_data_size: size (in bytes) of the drv_priv data area
926 * within &struct ieee80211_sta.
928 * @max_rates: maximum number of alternate rate retry stages
929 * @max_rate_tries: maximum number of tries for each stage
931 struct ieee80211_hw {
932 struct ieee80211_conf conf;
934 struct workqueue_struct *workqueue;
935 const char *rate_control_algorithm;
938 unsigned int extra_tx_headroom;
939 int channel_change_time;
944 u16 max_listen_interval;
951 * SET_IEEE80211_DEV - set device for 802.11 hardware
953 * @hw: the &struct ieee80211_hw to set the device for
954 * @dev: the &struct device of this 802.11 device
956 static inline void SET_IEEE80211_DEV(struct ieee80211_hw *hw, struct device *dev)
958 set_wiphy_dev(hw->wiphy, dev);
962 * SET_IEEE80211_PERM_ADDR - set the permanent MAC address for 802.11 hardware
964 * @hw: the &struct ieee80211_hw to set the MAC address for
965 * @addr: the address to set
967 static inline void SET_IEEE80211_PERM_ADDR(struct ieee80211_hw *hw, u8 *addr)
969 memcpy(hw->wiphy->perm_addr, addr, ETH_ALEN);
972 static inline int ieee80211_num_regular_queues(struct ieee80211_hw *hw)
977 static inline int ieee80211_num_queues(struct ieee80211_hw *hw)
979 return hw->queues + hw->ampdu_queues;
982 static inline struct ieee80211_rate *
983 ieee80211_get_tx_rate(const struct ieee80211_hw *hw,
984 const struct ieee80211_tx_info *c)
986 if (WARN_ON(c->control.rates[0].idx < 0))
988 return &hw->wiphy->bands[c->band]->bitrates[c->control.rates[0].idx];
991 static inline struct ieee80211_rate *
992 ieee80211_get_rts_cts_rate(const struct ieee80211_hw *hw,
993 const struct ieee80211_tx_info *c)
995 if (c->control.rts_cts_rate_idx < 0)
997 return &hw->wiphy->bands[c->band]->bitrates[c->control.rts_cts_rate_idx];
1000 static inline struct ieee80211_rate *
1001 ieee80211_get_alt_retry_rate(const struct ieee80211_hw *hw,
1002 const struct ieee80211_tx_info *c, int idx)
1004 if (c->control.rates[idx + 1].idx < 0)
1006 return &hw->wiphy->bands[c->band]->bitrates[c->control.rates[idx + 1].idx];
1010 * DOC: Hardware crypto acceleration
1012 * mac80211 is capable of taking advantage of many hardware
1013 * acceleration designs for encryption and decryption operations.
1015 * The set_key() callback in the &struct ieee80211_ops for a given
1016 * device is called to enable hardware acceleration of encryption and
1017 * decryption. The callback takes a @sta parameter that will be NULL
1018 * for default keys or keys used for transmission only, or point to
1019 * the station information for the peer for individual keys.
1020 * Multiple transmission keys with the same key index may be used when
1021 * VLANs are configured for an access point.
1023 * When transmitting, the TX control data will use the @hw_key_idx
1024 * selected by the driver by modifying the &struct ieee80211_key_conf
1025 * pointed to by the @key parameter to the set_key() function.
1027 * The set_key() call for the %SET_KEY command should return 0 if
1028 * the key is now in use, -%EOPNOTSUPP or -%ENOSPC if it couldn't be
1029 * added; if you return 0 then hw_key_idx must be assigned to the
1030 * hardware key index, you are free to use the full u8 range.
1032 * When the cmd is %DISABLE_KEY then it must succeed.
1034 * Note that it is permissible to not decrypt a frame even if a key
1035 * for it has been uploaded to hardware, the stack will not make any
1036 * decision based on whether a key has been uploaded or not but rather
1037 * based on the receive flags.
1039 * The &struct ieee80211_key_conf structure pointed to by the @key
1040 * parameter is guaranteed to be valid until another call to set_key()
1041 * removes it, but it can only be used as a cookie to differentiate
1044 * In TKIP some HW need to be provided a phase 1 key, for RX decryption
1045 * acceleration (i.e. iwlwifi). Those drivers should provide update_tkip_key
1047 * The update_tkip_key() call updates the driver with the new phase 1 key.
1048 * This happens everytime the iv16 wraps around (every 65536 packets). The
1049 * set_key() call will happen only once for each key (unless the AP did
1050 * rekeying), it will not include a valid phase 1 key. The valid phase 1 key is
1051 * provided by update_tkip_key only. The trigger that makes mac80211 call this
1052 * handler is software decryption with wrap around of iv16.
1056 * DOC: Frame filtering
1058 * mac80211 requires to see many management frames for proper
1059 * operation, and users may want to see many more frames when
1060 * in monitor mode. However, for best CPU usage and power consumption,
1061 * having as few frames as possible percolate through the stack is
1062 * desirable. Hence, the hardware should filter as much as possible.
1064 * To achieve this, mac80211 uses filter flags (see below) to tell
1065 * the driver's configure_filter() function which frames should be
1066 * passed to mac80211 and which should be filtered out.
1068 * The configure_filter() callback is invoked with the parameters
1069 * @mc_count and @mc_list for the combined multicast address list
1070 * of all virtual interfaces, @changed_flags telling which flags
1071 * were changed and @total_flags with the new flag states.
1073 * If your device has no multicast address filters your driver will
1074 * need to check both the %FIF_ALLMULTI flag and the @mc_count
1075 * parameter to see whether multicast frames should be accepted
1078 * All unsupported flags in @total_flags must be cleared.
1079 * Hardware does not support a flag if it is incapable of _passing_
1080 * the frame to the stack. Otherwise the driver must ignore
1081 * the flag, but not clear it.
1082 * You must _only_ clear the flag (announce no support for the
1083 * flag to mac80211) if you are not able to pass the packet type
1084 * to the stack (so the hardware always filters it).
1085 * So for example, you should clear @FIF_CONTROL, if your hardware
1086 * always filters control frames. If your hardware always passes
1087 * control frames to the kernel and is incapable of filtering them,
1088 * you do _not_ clear the @FIF_CONTROL flag.
1089 * This rule applies to all other FIF flags as well.
1093 * enum ieee80211_filter_flags - hardware filter flags
1095 * These flags determine what the filter in hardware should be
1096 * programmed to let through and what should not be passed to the
1097 * stack. It is always safe to pass more frames than requested,
1098 * but this has negative impact on power consumption.
1100 * @FIF_PROMISC_IN_BSS: promiscuous mode within your BSS,
1101 * think of the BSS as your network segment and then this corresponds
1102 * to the regular ethernet device promiscuous mode.
1104 * @FIF_ALLMULTI: pass all multicast frames, this is used if requested
1105 * by the user or if the hardware is not capable of filtering by
1106 * multicast address.
1108 * @FIF_FCSFAIL: pass frames with failed FCS (but you need to set the
1109 * %RX_FLAG_FAILED_FCS_CRC for them)
1111 * @FIF_PLCPFAIL: pass frames with failed PLCP CRC (but you need to set
1112 * the %RX_FLAG_FAILED_PLCP_CRC for them
1114 * @FIF_BCN_PRBRESP_PROMISC: This flag is set during scanning to indicate
1115 * to the hardware that it should not filter beacons or probe responses
1116 * by BSSID. Filtering them can greatly reduce the amount of processing
1117 * mac80211 needs to do and the amount of CPU wakeups, so you should
1118 * honour this flag if possible.
1120 * @FIF_CONTROL: pass control frames, if PROMISC_IN_BSS is not set then
1121 * only those addressed to this station
1123 * @FIF_OTHER_BSS: pass frames destined to other BSSes
1125 enum ieee80211_filter_flags {
1126 FIF_PROMISC_IN_BSS = 1<<0,
1127 FIF_ALLMULTI = 1<<1,
1129 FIF_PLCPFAIL = 1<<3,
1130 FIF_BCN_PRBRESP_PROMISC = 1<<4,
1132 FIF_OTHER_BSS = 1<<6,
1136 * enum ieee80211_ampdu_mlme_action - A-MPDU actions
1138 * These flags are used with the ampdu_action() callback in
1139 * &struct ieee80211_ops to indicate which action is needed.
1140 * @IEEE80211_AMPDU_RX_START: start Rx aggregation
1141 * @IEEE80211_AMPDU_RX_STOP: stop Rx aggregation
1142 * @IEEE80211_AMPDU_TX_START: start Tx aggregation
1143 * @IEEE80211_AMPDU_TX_STOP: stop Tx aggregation
1144 * @IEEE80211_AMPDU_TX_RESUME: resume TX aggregation
1146 enum ieee80211_ampdu_mlme_action {
1147 IEEE80211_AMPDU_RX_START,
1148 IEEE80211_AMPDU_RX_STOP,
1149 IEEE80211_AMPDU_TX_START,
1150 IEEE80211_AMPDU_TX_STOP,
1151 IEEE80211_AMPDU_TX_RESUME,
1155 * struct ieee80211_ops - callbacks from mac80211 to the driver
1157 * This structure contains various callbacks that the driver may
1158 * handle or, in some cases, must handle, for example to configure
1159 * the hardware to a new channel or to transmit a frame.
1161 * @tx: Handler that 802.11 module calls for each transmitted frame.
1162 * skb contains the buffer starting from the IEEE 802.11 header.
1163 * The low-level driver should send the frame out based on
1164 * configuration in the TX control data. This handler should,
1165 * preferably, never fail and stop queues appropriately, more
1166 * importantly, however, it must never fail for A-MPDU-queues.
1167 * Must be implemented and atomic.
1169 * @start: Called before the first netdevice attached to the hardware
1170 * is enabled. This should turn on the hardware and must turn on
1171 * frame reception (for possibly enabled monitor interfaces.)
1172 * Returns negative error codes, these may be seen in userspace,
1174 * When the device is started it should not have a MAC address
1175 * to avoid acknowledging frames before a non-monitor device
1177 * Must be implemented.
1179 * @stop: Called after last netdevice attached to the hardware
1180 * is disabled. This should turn off the hardware (at least
1181 * it must turn off frame reception.)
1182 * May be called right after add_interface if that rejects
1184 * Must be implemented.
1186 * @add_interface: Called when a netdevice attached to the hardware is
1187 * enabled. Because it is not called for monitor mode devices, @start
1188 * and @stop must be implemented.
1189 * The driver should perform any initialization it needs before
1190 * the device can be enabled. The initial configuration for the
1191 * interface is given in the conf parameter.
1192 * The callback may refuse to add an interface by returning a
1193 * negative error code (which will be seen in userspace.)
1194 * Must be implemented.
1196 * @remove_interface: Notifies a driver that an interface is going down.
1197 * The @stop callback is called after this if it is the last interface
1198 * and no monitor interfaces are present.
1199 * When all interfaces are removed, the MAC address in the hardware
1200 * must be cleared so the device no longer acknowledges packets,
1201 * the mac_addr member of the conf structure is, however, set to the
1202 * MAC address of the device going away.
1203 * Hence, this callback must be implemented.
1205 * @config: Handler for configuration requests. IEEE 802.11 code calls this
1206 * function to change hardware configuration, e.g., channel.
1208 * @config_interface: Handler for configuration requests related to interfaces
1209 * (e.g. BSSID changes.)
1211 * @bss_info_changed: Handler for configuration requests related to BSS
1212 * parameters that may vary during BSS's lifespan, and may affect low
1213 * level driver (e.g. assoc/disassoc status, erp parameters).
1214 * This function should not be used if no BSS has been set, unless
1215 * for association indication. The @changed parameter indicates which
1216 * of the bss parameters has changed when a call is made.
1218 * @configure_filter: Configure the device's RX filter.
1219 * See the section "Frame filtering" for more information.
1220 * This callback must be implemented and atomic.
1222 * @set_tim: Set TIM bit. mac80211 calls this function when a TIM bit
1223 * must be set or cleared for a given STA. Must be atomic.
1225 * @set_key: See the section "Hardware crypto acceleration"
1226 * This callback can sleep, and is only called between add_interface
1227 * and remove_interface calls, i.e. while the given virtual interface
1230 * @update_tkip_key: See the section "Hardware crypto acceleration"
1231 * This callback will be called in the context of Rx. Called for drivers
1232 * which set IEEE80211_KEY_FLAG_TKIP_REQ_RX_P1_KEY.
1234 * @hw_scan: Ask the hardware to service the scan request, no need to start
1235 * the scan state machine in stack. The scan must honour the channel
1236 * configuration done by the regulatory agent in the wiphy's registered
1237 * bands. When the scan finishes, ieee80211_scan_completed() must be
1238 * called; note that it also must be called when the scan cannot finish
1239 * because the hardware is turned off! Anything else is a bug!
1241 * @get_stats: return low-level statistics
1243 * @get_tkip_seq: If your device implements TKIP encryption in hardware this
1244 * callback should be provided to read the TKIP transmit IVs (both IV32
1245 * and IV16) for the given key from hardware.
1247 * @set_rts_threshold: Configuration of RTS threshold (if device needs it)
1249 * @sta_notify: Notifies low level driver about addition, removal or power
1250 * state transition of an associated station, AP, IBSS/WDS/mesh peer etc.
1253 * @conf_tx: Configure TX queue parameters (EDCF (aifs, cw_min, cw_max),
1254 * bursting) for a hardware TX queue.
1256 * @get_tx_stats: Get statistics of the current TX queue status. This is used
1257 * to get number of currently queued packets (queue length), maximum queue
1258 * size (limit), and total number of packets sent using each TX queue
1259 * (count). The 'stats' pointer points to an array that has hw->queues +
1260 * hw->ampdu_queues items.
1262 * @get_tsf: Get the current TSF timer value from firmware/hardware. Currently,
1263 * this is only used for IBSS mode debugging and, as such, is not a
1264 * required function. Must be atomic.
1266 * @reset_tsf: Reset the TSF timer and allow firmware/hardware to synchronize
1267 * with other STAs in the IBSS. This is only used in IBSS mode. This
1268 * function is optional if the firmware/hardware takes full care of
1269 * TSF synchronization.
1271 * @tx_last_beacon: Determine whether the last IBSS beacon was sent by us.
1272 * This is needed only for IBSS mode and the result of this function is
1273 * used to determine whether to reply to Probe Requests.
1275 * @ampdu_action: Perform a certain A-MPDU action
1276 * The RA/TID combination determines the destination and TID we want
1277 * the ampdu action to be performed for. The action is defined through
1278 * ieee80211_ampdu_mlme_action. Starting sequence number (@ssn)
1279 * is the first frame we expect to perform the action on. notice
1280 * that TX/RX_STOP can pass NULL for this parameter.
1282 struct ieee80211_ops {
1283 int (*tx)(struct ieee80211_hw *hw, struct sk_buff *skb);
1284 int (*start)(struct ieee80211_hw *hw);
1285 void (*stop)(struct ieee80211_hw *hw);
1286 int (*add_interface)(struct ieee80211_hw *hw,
1287 struct ieee80211_if_init_conf *conf);
1288 void (*remove_interface)(struct ieee80211_hw *hw,
1289 struct ieee80211_if_init_conf *conf);
1290 int (*config)(struct ieee80211_hw *hw, u32 changed);
1291 int (*config_interface)(struct ieee80211_hw *hw,
1292 struct ieee80211_vif *vif,
1293 struct ieee80211_if_conf *conf);
1294 void (*bss_info_changed)(struct ieee80211_hw *hw,
1295 struct ieee80211_vif *vif,
1296 struct ieee80211_bss_conf *info,
1298 void (*configure_filter)(struct ieee80211_hw *hw,
1299 unsigned int changed_flags,
1300 unsigned int *total_flags,
1301 int mc_count, struct dev_addr_list *mc_list);
1302 int (*set_tim)(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
1304 int (*set_key)(struct ieee80211_hw *hw, enum set_key_cmd cmd,
1305 struct ieee80211_vif *vif, struct ieee80211_sta *sta,
1306 struct ieee80211_key_conf *key);
1307 void (*update_tkip_key)(struct ieee80211_hw *hw,
1308 struct ieee80211_key_conf *conf, const u8 *address,
1309 u32 iv32, u16 *phase1key);
1310 int (*hw_scan)(struct ieee80211_hw *hw, u8 *ssid, size_t len);
1311 int (*get_stats)(struct ieee80211_hw *hw,
1312 struct ieee80211_low_level_stats *stats);
1313 void (*get_tkip_seq)(struct ieee80211_hw *hw, u8 hw_key_idx,
1314 u32 *iv32, u16 *iv16);
1315 int (*set_rts_threshold)(struct ieee80211_hw *hw, u32 value);
1316 void (*sta_notify)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1317 enum sta_notify_cmd, struct ieee80211_sta *sta);
1318 int (*conf_tx)(struct ieee80211_hw *hw, u16 queue,
1319 const struct ieee80211_tx_queue_params *params);
1320 int (*get_tx_stats)(struct ieee80211_hw *hw,
1321 struct ieee80211_tx_queue_stats *stats);
1322 u64 (*get_tsf)(struct ieee80211_hw *hw);
1323 void (*reset_tsf)(struct ieee80211_hw *hw);
1324 int (*tx_last_beacon)(struct ieee80211_hw *hw);
1325 int (*ampdu_action)(struct ieee80211_hw *hw,
1326 enum ieee80211_ampdu_mlme_action action,
1327 struct ieee80211_sta *sta, u16 tid, u16 *ssn);
1331 * ieee80211_alloc_hw - Allocate a new hardware device
1333 * This must be called once for each hardware device. The returned pointer
1334 * must be used to refer to this device when calling other functions.
1335 * mac80211 allocates a private data area for the driver pointed to by
1336 * @priv in &struct ieee80211_hw, the size of this area is given as
1339 * @priv_data_len: length of private data
1340 * @ops: callbacks for this device
1342 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1343 const struct ieee80211_ops *ops);
1346 * ieee80211_register_hw - Register hardware device
1348 * You must call this function before any other functions in
1349 * mac80211. Note that before a hardware can be registered, you
1350 * need to fill the contained wiphy's information.
1352 * @hw: the device to register as returned by ieee80211_alloc_hw()
1354 int ieee80211_register_hw(struct ieee80211_hw *hw);
1356 #ifdef CONFIG_MAC80211_LEDS
1357 extern char *__ieee80211_get_tx_led_name(struct ieee80211_hw *hw);
1358 extern char *__ieee80211_get_rx_led_name(struct ieee80211_hw *hw);
1359 extern char *__ieee80211_get_assoc_led_name(struct ieee80211_hw *hw);
1360 extern char *__ieee80211_get_radio_led_name(struct ieee80211_hw *hw);
1363 * ieee80211_get_tx_led_name - get name of TX LED
1365 * mac80211 creates a transmit LED trigger for each wireless hardware
1366 * that can be used to drive LEDs if your driver registers a LED device.
1367 * This function returns the name (or %NULL if not configured for LEDs)
1368 * of the trigger so you can automatically link the LED device.
1370 * @hw: the hardware to get the LED trigger name for
1372 static inline char *ieee80211_get_tx_led_name(struct ieee80211_hw *hw)
1374 #ifdef CONFIG_MAC80211_LEDS
1375 return __ieee80211_get_tx_led_name(hw);
1382 * ieee80211_get_rx_led_name - get name of RX LED
1384 * mac80211 creates a receive LED trigger for each wireless hardware
1385 * that can be used to drive LEDs if your driver registers a LED device.
1386 * This function returns the name (or %NULL if not configured for LEDs)
1387 * of the trigger so you can automatically link the LED device.
1389 * @hw: the hardware to get the LED trigger name for
1391 static inline char *ieee80211_get_rx_led_name(struct ieee80211_hw *hw)
1393 #ifdef CONFIG_MAC80211_LEDS
1394 return __ieee80211_get_rx_led_name(hw);
1401 * ieee80211_get_assoc_led_name - get name of association LED
1403 * mac80211 creates a association LED trigger for each wireless hardware
1404 * that can be used to drive LEDs if your driver registers a LED device.
1405 * This function returns the name (or %NULL if not configured for LEDs)
1406 * of the trigger so you can automatically link the LED device.
1408 * @hw: the hardware to get the LED trigger name for
1410 static inline char *ieee80211_get_assoc_led_name(struct ieee80211_hw *hw)
1412 #ifdef CONFIG_MAC80211_LEDS
1413 return __ieee80211_get_assoc_led_name(hw);
1420 * ieee80211_get_radio_led_name - get name of radio LED
1422 * mac80211 creates a radio change LED trigger for each wireless hardware
1423 * that can be used to drive LEDs if your driver registers a LED device.
1424 * This function returns the name (or %NULL if not configured for LEDs)
1425 * of the trigger so you can automatically link the LED device.
1427 * @hw: the hardware to get the LED trigger name for
1429 static inline char *ieee80211_get_radio_led_name(struct ieee80211_hw *hw)
1431 #ifdef CONFIG_MAC80211_LEDS
1432 return __ieee80211_get_radio_led_name(hw);
1439 * ieee80211_unregister_hw - Unregister a hardware device
1441 * This function instructs mac80211 to free allocated resources
1442 * and unregister netdevices from the networking subsystem.
1444 * @hw: the hardware to unregister
1446 void ieee80211_unregister_hw(struct ieee80211_hw *hw);
1449 * ieee80211_free_hw - free hardware descriptor
1451 * This function frees everything that was allocated, including the
1452 * private data for the driver. You must call ieee80211_unregister_hw()
1453 * before calling this function.
1455 * @hw: the hardware to free
1457 void ieee80211_free_hw(struct ieee80211_hw *hw);
1459 /* trick to avoid symbol clashes with the ieee80211 subsystem */
1460 void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
1461 struct ieee80211_rx_status *status);
1464 * ieee80211_rx - receive frame
1466 * Use this function to hand received frames to mac80211. The receive
1467 * buffer in @skb must start with an IEEE 802.11 header or a radiotap
1468 * header if %RX_FLAG_RADIOTAP is set in the @status flags.
1470 * This function may not be called in IRQ context. Calls to this function
1471 * for a single hardware must be synchronized against each other. Calls
1472 * to this function and ieee80211_rx_irqsafe() may not be mixed for a
1475 * @hw: the hardware this frame came in on
1476 * @skb: the buffer to receive, owned by mac80211 after this call
1477 * @status: status of this frame; the status pointer need not be valid
1478 * after this function returns
1480 static inline void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
1481 struct ieee80211_rx_status *status)
1483 __ieee80211_rx(hw, skb, status);
1487 * ieee80211_rx_irqsafe - receive frame
1489 * Like ieee80211_rx() but can be called in IRQ context
1490 * (internally defers to a tasklet.)
1492 * Calls to this function and ieee80211_rx() may not be mixed for a
1495 * @hw: the hardware this frame came in on
1496 * @skb: the buffer to receive, owned by mac80211 after this call
1497 * @status: status of this frame; the status pointer need not be valid
1498 * after this function returns and is not freed by mac80211,
1499 * it is recommended that it points to a stack area
1501 void ieee80211_rx_irqsafe(struct ieee80211_hw *hw,
1502 struct sk_buff *skb,
1503 struct ieee80211_rx_status *status);
1506 * ieee80211_tx_status - transmit status callback
1508 * Call this function for all transmitted frames after they have been
1509 * transmitted. It is permissible to not call this function for
1510 * multicast frames but this can affect statistics.
1512 * This function may not be called in IRQ context. Calls to this function
1513 * for a single hardware must be synchronized against each other. Calls
1514 * to this function and ieee80211_tx_status_irqsafe() may not be mixed
1515 * for a single hardware.
1517 * @hw: the hardware the frame was transmitted by
1518 * @skb: the frame that was transmitted, owned by mac80211 after this call
1520 void ieee80211_tx_status(struct ieee80211_hw *hw,
1521 struct sk_buff *skb);
1524 * ieee80211_tx_status_irqsafe - IRQ-safe transmit status callback
1526 * Like ieee80211_tx_status() but can be called in IRQ context
1527 * (internally defers to a tasklet.)
1529 * Calls to this function and ieee80211_tx_status() may not be mixed for a
1532 * @hw: the hardware the frame was transmitted by
1533 * @skb: the frame that was transmitted, owned by mac80211 after this call
1535 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
1536 struct sk_buff *skb);
1539 * ieee80211_beacon_get - beacon generation function
1540 * @hw: pointer obtained from ieee80211_alloc_hw().
1541 * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf.
1543 * If the beacon frames are generated by the host system (i.e., not in
1544 * hardware/firmware), the low-level driver uses this function to receive
1545 * the next beacon frame from the 802.11 code. The low-level is responsible
1546 * for calling this function before beacon data is needed (e.g., based on
1547 * hardware interrupt). Returned skb is used only once and low-level driver
1548 * is responsible for freeing it.
1550 struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
1551 struct ieee80211_vif *vif);
1554 * ieee80211_rts_get - RTS frame generation function
1555 * @hw: pointer obtained from ieee80211_alloc_hw().
1556 * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf.
1557 * @frame: pointer to the frame that is going to be protected by the RTS.
1558 * @frame_len: the frame length (in octets).
1559 * @frame_txctl: &struct ieee80211_tx_info of the frame.
1560 * @rts: The buffer where to store the RTS frame.
1562 * If the RTS frames are generated by the host system (i.e., not in
1563 * hardware/firmware), the low-level driver uses this function to receive
1564 * the next RTS frame from the 802.11 code. The low-level is responsible
1565 * for calling this function before and RTS frame is needed.
1567 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1568 const void *frame, size_t frame_len,
1569 const struct ieee80211_tx_info *frame_txctl,
1570 struct ieee80211_rts *rts);
1573 * ieee80211_rts_duration - Get the duration field for an RTS frame
1574 * @hw: pointer obtained from ieee80211_alloc_hw().
1575 * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf.
1576 * @frame_len: the length of the frame that is going to be protected by the RTS.
1577 * @frame_txctl: &struct ieee80211_tx_info of the frame.
1579 * If the RTS is generated in firmware, but the host system must provide
1580 * the duration field, the low-level driver uses this function to receive
1581 * the duration field value in little-endian byteorder.
1583 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
1584 struct ieee80211_vif *vif, size_t frame_len,
1585 const struct ieee80211_tx_info *frame_txctl);
1588 * ieee80211_ctstoself_get - CTS-to-self frame generation function
1589 * @hw: pointer obtained from ieee80211_alloc_hw().
1590 * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf.
1591 * @frame: pointer to the frame that is going to be protected by the CTS-to-self.
1592 * @frame_len: the frame length (in octets).
1593 * @frame_txctl: &struct ieee80211_tx_info of the frame.
1594 * @cts: The buffer where to store the CTS-to-self frame.
1596 * If the CTS-to-self frames are generated by the host system (i.e., not in
1597 * hardware/firmware), the low-level driver uses this function to receive
1598 * the next CTS-to-self frame from the 802.11 code. The low-level is responsible
1599 * for calling this function before and CTS-to-self frame is needed.
1601 void ieee80211_ctstoself_get(struct ieee80211_hw *hw,
1602 struct ieee80211_vif *vif,
1603 const void *frame, size_t frame_len,
1604 const struct ieee80211_tx_info *frame_txctl,
1605 struct ieee80211_cts *cts);
1608 * ieee80211_ctstoself_duration - Get the duration field for a CTS-to-self frame
1609 * @hw: pointer obtained from ieee80211_alloc_hw().
1610 * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf.
1611 * @frame_len: the length of the frame that is going to be protected by the CTS-to-self.
1612 * @frame_txctl: &struct ieee80211_tx_info of the frame.
1614 * If the CTS-to-self is generated in firmware, but the host system must provide
1615 * the duration field, the low-level driver uses this function to receive
1616 * the duration field value in little-endian byteorder.
1618 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
1619 struct ieee80211_vif *vif,
1621 const struct ieee80211_tx_info *frame_txctl);
1624 * ieee80211_generic_frame_duration - Calculate the duration field for a frame
1625 * @hw: pointer obtained from ieee80211_alloc_hw().
1626 * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf.
1627 * @frame_len: the length of the frame.
1628 * @rate: the rate at which the frame is going to be transmitted.
1630 * Calculate the duration field of some generic frame, given its
1631 * length and transmission rate (in 100kbps).
1633 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
1634 struct ieee80211_vif *vif,
1636 struct ieee80211_rate *rate);
1639 * ieee80211_get_buffered_bc - accessing buffered broadcast and multicast frames
1640 * @hw: pointer as obtained from ieee80211_alloc_hw().
1641 * @vif: &struct ieee80211_vif pointer from &struct ieee80211_if_init_conf.
1643 * Function for accessing buffered broadcast and multicast frames. If
1644 * hardware/firmware does not implement buffering of broadcast/multicast
1645 * frames when power saving is used, 802.11 code buffers them in the host
1646 * memory. The low-level driver uses this function to fetch next buffered
1647 * frame. In most cases, this is used when generating beacon frame. This
1648 * function returns a pointer to the next buffered skb or NULL if no more
1649 * buffered frames are available.
1651 * Note: buffered frames are returned only after DTIM beacon frame was
1652 * generated with ieee80211_beacon_get() and the low-level driver must thus
1653 * call ieee80211_beacon_get() first. ieee80211_get_buffered_bc() returns
1654 * NULL if the previous generated beacon was not DTIM, so the low-level driver
1655 * does not need to check for DTIM beacons separately and should be able to
1656 * use common code for all beacons.
1659 ieee80211_get_buffered_bc(struct ieee80211_hw *hw, struct ieee80211_vif *vif);
1662 * ieee80211_get_hdrlen_from_skb - get header length from data
1664 * Given an skb with a raw 802.11 header at the data pointer this function
1665 * returns the 802.11 header length in bytes (not including encryption
1666 * headers). If the data in the sk_buff is too short to contain a valid 802.11
1667 * header the function returns 0.
1671 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb);
1674 * ieee80211_hdrlen - get header length in bytes from frame control
1675 * @fc: frame control field in little-endian format
1677 unsigned int ieee80211_hdrlen(__le16 fc);
1680 * ieee80211_get_tkip_key - get a TKIP rc4 for skb
1682 * This function computes a TKIP rc4 key for an skb. It computes
1683 * a phase 1 key if needed (iv16 wraps around). This function is to
1684 * be used by drivers which can do HW encryption but need to compute
1685 * to phase 1/2 key in SW.
1687 * @keyconf: the parameter passed with the set key
1688 * @skb: the skb for which the key is needed
1690 * @key: a buffer to which the key will be written
1692 void ieee80211_get_tkip_key(struct ieee80211_key_conf *keyconf,
1693 struct sk_buff *skb,
1694 enum ieee80211_tkip_key_type type, u8 *key);
1696 * ieee80211_wake_queue - wake specific queue
1697 * @hw: pointer as obtained from ieee80211_alloc_hw().
1698 * @queue: queue number (counted from zero).
1700 * Drivers should use this function instead of netif_wake_queue.
1702 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue);
1705 * ieee80211_stop_queue - stop specific queue
1706 * @hw: pointer as obtained from ieee80211_alloc_hw().
1707 * @queue: queue number (counted from zero).
1709 * Drivers should use this function instead of netif_stop_queue.
1711 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue);
1714 * ieee80211_queue_stopped - test status of the queue
1715 * @hw: pointer as obtained from ieee80211_alloc_hw().
1716 * @queue: queue number (counted from zero).
1718 * Drivers should use this function instead of netif_stop_queue.
1721 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue);
1724 * ieee80211_stop_queues - stop all queues
1725 * @hw: pointer as obtained from ieee80211_alloc_hw().
1727 * Drivers should use this function instead of netif_stop_queue.
1729 void ieee80211_stop_queues(struct ieee80211_hw *hw);
1732 * ieee80211_wake_queues - wake all queues
1733 * @hw: pointer as obtained from ieee80211_alloc_hw().
1735 * Drivers should use this function instead of netif_wake_queue.
1737 void ieee80211_wake_queues(struct ieee80211_hw *hw);
1740 * ieee80211_scan_completed - completed hardware scan
1742 * When hardware scan offload is used (i.e. the hw_scan() callback is
1743 * assigned) this function needs to be called by the driver to notify
1744 * mac80211 that the scan finished.
1746 * @hw: the hardware that finished the scan
1748 void ieee80211_scan_completed(struct ieee80211_hw *hw);
1751 * ieee80211_iterate_active_interfaces - iterate active interfaces
1753 * This function iterates over the interfaces associated with a given
1754 * hardware that are currently active and calls the callback for them.
1755 * This function allows the iterator function to sleep, when the iterator
1756 * function is atomic @ieee80211_iterate_active_interfaces_atomic can
1759 * @hw: the hardware struct of which the interfaces should be iterated over
1760 * @iterator: the iterator function to call
1761 * @data: first argument of the iterator function
1763 void ieee80211_iterate_active_interfaces(struct ieee80211_hw *hw,
1764 void (*iterator)(void *data, u8 *mac,
1765 struct ieee80211_vif *vif),
1769 * ieee80211_iterate_active_interfaces_atomic - iterate active interfaces
1771 * This function iterates over the interfaces associated with a given
1772 * hardware that are currently active and calls the callback for them.
1773 * This function requires the iterator callback function to be atomic,
1774 * if that is not desired, use @ieee80211_iterate_active_interfaces instead.
1776 * @hw: the hardware struct of which the interfaces should be iterated over
1777 * @iterator: the iterator function to call, cannot sleep
1778 * @data: first argument of the iterator function
1780 void ieee80211_iterate_active_interfaces_atomic(struct ieee80211_hw *hw,
1781 void (*iterator)(void *data,
1783 struct ieee80211_vif *vif),
1787 * ieee80211_start_tx_ba_session - Start a tx Block Ack session.
1788 * @hw: pointer as obtained from ieee80211_alloc_hw().
1789 * @ra: receiver address of the BA session recipient
1790 * @tid: the TID to BA on.
1792 * Return: success if addBA request was sent, failure otherwise
1794 * Although mac80211/low level driver/user space application can estimate
1795 * the need to start aggregation on a certain RA/TID, the session level
1796 * will be managed by the mac80211.
1798 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid);
1801 * ieee80211_start_tx_ba_cb - low level driver ready to aggregate.
1802 * @hw: pointer as obtained from ieee80211_alloc_hw().
1803 * @ra: receiver address of the BA session recipient.
1804 * @tid: the TID to BA on.
1806 * This function must be called by low level driver once it has
1807 * finished with preparations for the BA session.
1809 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid);
1812 * ieee80211_start_tx_ba_cb_irqsafe - low level driver ready to aggregate.
1813 * @hw: pointer as obtained from ieee80211_alloc_hw().
1814 * @ra: receiver address of the BA session recipient.
1815 * @tid: the TID to BA on.
1817 * This function must be called by low level driver once it has
1818 * finished with preparations for the BA session.
1819 * This version of the function is IRQ-safe.
1821 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, const u8 *ra,
1825 * ieee80211_stop_tx_ba_session - Stop a Block Ack session.
1826 * @hw: pointer as obtained from ieee80211_alloc_hw().
1827 * @ra: receiver address of the BA session recipient
1828 * @tid: the TID to stop BA.
1829 * @initiator: if indicates initiator DELBA frame will be sent.
1831 * Return: error if no sta with matching da found, success otherwise
1833 * Although mac80211/low level driver/user space application can estimate
1834 * the need to stop aggregation on a certain RA/TID, the session level
1835 * will be managed by the mac80211.
1837 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
1839 enum ieee80211_back_parties initiator);
1842 * ieee80211_stop_tx_ba_cb - low level driver ready to stop aggregate.
1843 * @hw: pointer as obtained from ieee80211_alloc_hw().
1844 * @ra: receiver address of the BA session recipient.
1845 * @tid: the desired TID to BA on.
1847 * This function must be called by low level driver once it has
1848 * finished with preparations for the BA session tear down.
1850 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid);
1853 * ieee80211_stop_tx_ba_cb_irqsafe - low level driver ready to stop aggregate.
1854 * @hw: pointer as obtained from ieee80211_alloc_hw().
1855 * @ra: receiver address of the BA session recipient.
1856 * @tid: the desired TID to BA on.
1858 * This function must be called by low level driver once it has
1859 * finished with preparations for the BA session tear down.
1860 * This version of the function is IRQ-safe.
1862 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw, const u8 *ra,
1866 * ieee80211_find_sta - find a station
1868 * @hw: pointer as obtained from ieee80211_alloc_hw()
1869 * @addr: station's address
1871 * This function must be called under RCU lock and the
1872 * resulting pointer is only valid under RCU lock as well.
1874 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_hw *hw,
1878 /* Rate control API */
1881 * struct ieee80211_tx_rate_control - rate control information for/from RC algo
1883 * @hw: The hardware the algorithm is invoked for.
1884 * @sband: The band this frame is being transmitted on.
1885 * @bss_conf: the current BSS configuration
1886 * @reported_rate: The rate control algorithm can fill this in to indicate
1887 * which rate should be reported to userspace as the current rate and
1888 * used for rate calculations in the mesh network.
1889 * @rts: whether RTS will be used for this frame because it is longer than the
1891 * @short_preamble: whether mac80211 will request short-preamble transmission
1892 * if the selected rate supports it
1893 * @max_rate_idx: user-requested maximum rate (not MCS for now)
1894 * @skb: the skb that will be transmitted, the control information in it needs
1897 struct ieee80211_tx_rate_control {
1898 struct ieee80211_hw *hw;
1899 struct ieee80211_supported_band *sband;
1900 struct ieee80211_bss_conf *bss_conf;
1901 struct sk_buff *skb;
1902 struct ieee80211_tx_rate reported_rate;
1903 bool rts, short_preamble;
1907 struct rate_control_ops {
1908 struct module *module;
1910 void *(*alloc)(struct ieee80211_hw *hw, struct dentry *debugfsdir);
1911 void (*free)(void *priv);
1913 void *(*alloc_sta)(void *priv, struct ieee80211_sta *sta, gfp_t gfp);
1914 void (*rate_init)(void *priv, struct ieee80211_supported_band *sband,
1915 struct ieee80211_sta *sta, void *priv_sta);
1916 void (*free_sta)(void *priv, struct ieee80211_sta *sta,
1919 void (*tx_status)(void *priv, struct ieee80211_supported_band *sband,
1920 struct ieee80211_sta *sta, void *priv_sta,
1921 struct sk_buff *skb);
1922 void (*get_rate)(void *priv, struct ieee80211_sta *sta, void *priv_sta,
1923 struct ieee80211_tx_rate_control *txrc);
1925 void (*add_sta_debugfs)(void *priv, void *priv_sta,
1926 struct dentry *dir);
1927 void (*remove_sta_debugfs)(void *priv, void *priv_sta);
1930 static inline int rate_supported(struct ieee80211_sta *sta,
1931 enum ieee80211_band band,
1934 return (sta == NULL || sta->supp_rates[band] & BIT(index));
1938 rate_lowest_index(struct ieee80211_supported_band *sband,
1939 struct ieee80211_sta *sta)
1943 for (i = 0; i < sband->n_bitrates; i++)
1944 if (rate_supported(sta, sband->band, i))
1947 /* warn when we cannot find a rate. */
1954 int ieee80211_rate_control_register(struct rate_control_ops *ops);
1955 void ieee80211_rate_control_unregister(struct rate_control_ops *ops);
1958 conf_is_ht20(struct ieee80211_conf *conf)
1960 return conf->channel_type == NL80211_CHAN_HT20;
1964 conf_is_ht40_minus(struct ieee80211_conf *conf)
1966 return conf->channel_type == NL80211_CHAN_HT40MINUS;
1970 conf_is_ht40_plus(struct ieee80211_conf *conf)
1972 return conf->channel_type == NL80211_CHAN_HT40PLUS;
1976 conf_is_ht40(struct ieee80211_conf *conf)
1978 return conf_is_ht40_minus(conf) || conf_is_ht40_plus(conf);
1982 conf_is_ht(struct ieee80211_conf *conf)
1984 return conf->channel_type != NL80211_CHAN_NO_HT;
1987 #endif /* MAC80211_H */