2 * Copyright (c) 2008-2009 Atheros Communications Inc.
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 static struct ieee80211_hw
* ath_get_virt_hw(struct ath_softc
*sc
,
20 struct ieee80211_hdr
*hdr
)
22 struct ieee80211_hw
*hw
= sc
->pri_wiphy
->hw
;
25 spin_lock_bh(&sc
->wiphy_lock
);
26 for (i
= 0; i
< sc
->num_sec_wiphy
; i
++) {
27 struct ath_wiphy
*aphy
= sc
->sec_wiphy
[i
];
30 if (compare_ether_addr(hdr
->addr1
, aphy
->hw
->wiphy
->perm_addr
)
36 spin_unlock_bh(&sc
->wiphy_lock
);
41 * Setup and link descriptors.
43 * 11N: we can no longer afford to self link the last descriptor.
44 * MAC acknowledges BA status as long as it copies frames to host
45 * buffer (or rx fifo). This can incorrectly acknowledge packets
46 * to a sender if last desc is self-linked.
48 static void ath_rx_buf_link(struct ath_softc
*sc
, struct ath_buf
*bf
)
50 struct ath_hw
*ah
= sc
->sc_ah
;
57 ds
->ds_link
= 0; /* link to null */
58 ds
->ds_data
= bf
->bf_buf_addr
;
60 /* virtual addr of the beginning of the buffer. */
63 ds
->ds_vdata
= skb
->data
;
65 /* setup rx descriptors. The rx.bufsize here tells the harware
66 * how much data it can DMA to us and that we are prepared
68 ath9k_hw_setuprxdesc(ah
, ds
,
72 if (sc
->rx
.rxlink
== NULL
)
73 ath9k_hw_putrxbuf(ah
, bf
->bf_daddr
);
75 *sc
->rx
.rxlink
= bf
->bf_daddr
;
77 sc
->rx
.rxlink
= &ds
->ds_link
;
81 static void ath_setdefantenna(struct ath_softc
*sc
, u32 antenna
)
83 /* XXX block beacon interrupts */
84 ath9k_hw_setantenna(sc
->sc_ah
, antenna
);
85 sc
->rx
.defant
= antenna
;
86 sc
->rx
.rxotherant
= 0;
90 * Extend 15-bit time stamp from rx descriptor to
91 * a full 64-bit TSF using the current h/w TSF.
93 static u64
ath_extend_tsf(struct ath_softc
*sc
, u32 rstamp
)
97 tsf
= ath9k_hw_gettsf64(sc
->sc_ah
);
98 if ((tsf
& 0x7fff) < rstamp
)
100 return (tsf
& ~0x7fff) | rstamp
;
104 * For Decrypt or Demic errors, we only mark packet status here and always push
105 * up the frame up to let mac80211 handle the actual error case, be it no
106 * decryption key or real decryption error. This let us keep statistics there.
108 static int ath_rx_prepare(struct ieee80211_hw
*hw
,
109 struct sk_buff
*skb
, struct ath_desc
*ds
,
110 struct ieee80211_rx_status
*rx_status
, bool *decrypt_error
,
111 struct ath_softc
*sc
)
113 struct ieee80211_hdr
*hdr
;
116 struct ieee80211_sta
*sta
;
118 int last_rssi
= ATH_RSSI_DUMMY_MARKER
;
120 hdr
= (struct ieee80211_hdr
*)skb
->data
;
121 fc
= hdr
->frame_control
;
122 memset(rx_status
, 0, sizeof(struct ieee80211_rx_status
));
124 if (ds
->ds_rxstat
.rs_more
) {
126 * Frame spans multiple descriptors; this cannot happen yet
127 * as we don't support jumbograms. If not in monitor mode,
128 * discard the frame. Enable this if you want to see
129 * error frames in Monitor mode.
131 if (sc
->sc_ah
->opmode
!= NL80211_IFTYPE_MONITOR
)
133 } else if (ds
->ds_rxstat
.rs_status
!= 0) {
134 if (ds
->ds_rxstat
.rs_status
& ATH9K_RXERR_CRC
)
135 rx_status
->flag
|= RX_FLAG_FAILED_FCS_CRC
;
136 if (ds
->ds_rxstat
.rs_status
& ATH9K_RXERR_PHY
)
139 if (ds
->ds_rxstat
.rs_status
& ATH9K_RXERR_DECRYPT
) {
140 *decrypt_error
= true;
141 } else if (ds
->ds_rxstat
.rs_status
& ATH9K_RXERR_MIC
) {
142 if (ieee80211_is_ctl(fc
))
144 * Sometimes, we get invalid
145 * MIC failures on valid control frames.
146 * Remove these mic errors.
148 ds
->ds_rxstat
.rs_status
&= ~ATH9K_RXERR_MIC
;
150 rx_status
->flag
|= RX_FLAG_MMIC_ERROR
;
153 * Reject error frames with the exception of
154 * decryption and MIC failures. For monitor mode,
155 * we also ignore the CRC error.
157 if (sc
->sc_ah
->opmode
== NL80211_IFTYPE_MONITOR
) {
158 if (ds
->ds_rxstat
.rs_status
&
159 ~(ATH9K_RXERR_DECRYPT
| ATH9K_RXERR_MIC
|
163 if (ds
->ds_rxstat
.rs_status
&
164 ~(ATH9K_RXERR_DECRYPT
| ATH9K_RXERR_MIC
)) {
170 ratecode
= ds
->ds_rxstat
.rs_rate
;
172 if (ratecode
& 0x80) {
174 rx_status
->flag
|= RX_FLAG_HT
;
175 if (ds
->ds_rxstat
.rs_flags
& ATH9K_RX_2040
)
176 rx_status
->flag
|= RX_FLAG_40MHZ
;
177 if (ds
->ds_rxstat
.rs_flags
& ATH9K_RX_GI
)
178 rx_status
->flag
|= RX_FLAG_SHORT_GI
;
179 rx_status
->rate_idx
= ratecode
& 0x7f;
181 int i
= 0, cur_band
, n_rates
;
183 cur_band
= hw
->conf
.channel
->band
;
184 n_rates
= sc
->sbands
[cur_band
].n_bitrates
;
186 for (i
= 0; i
< n_rates
; i
++) {
187 if (sc
->sbands
[cur_band
].bitrates
[i
].hw_value
==
189 rx_status
->rate_idx
= i
;
193 if (sc
->sbands
[cur_band
].bitrates
[i
].hw_value_short
==
195 rx_status
->rate_idx
= i
;
196 rx_status
->flag
|= RX_FLAG_SHORTPRE
;
203 /* XXX: use ieee80211_find_sta! */
204 sta
= ieee80211_find_sta_by_hw(sc
->hw
, hdr
->addr2
);
206 an
= (struct ath_node
*) sta
->drv_priv
;
207 if (ds
->ds_rxstat
.rs_rssi
!= ATH9K_RSSI_BAD
&&
208 !ds
->ds_rxstat
.rs_moreaggr
)
209 ATH_RSSI_LPF(an
->last_rssi
, ds
->ds_rxstat
.rs_rssi
);
210 last_rssi
= an
->last_rssi
;
214 if (likely(last_rssi
!= ATH_RSSI_DUMMY_MARKER
))
215 ds
->ds_rxstat
.rs_rssi
= ATH_EP_RND(last_rssi
,
216 ATH_RSSI_EP_MULTIPLIER
);
217 if (ds
->ds_rxstat
.rs_rssi
< 0)
218 ds
->ds_rxstat
.rs_rssi
= 0;
219 else if (ds
->ds_rxstat
.rs_rssi
> 127)
220 ds
->ds_rxstat
.rs_rssi
= 127;
222 /* Update Beacon RSSI, this is used by ANI. */
223 if (ieee80211_is_beacon(fc
))
224 sc
->sc_ah
->stats
.avgbrssi
= ds
->ds_rxstat
.rs_rssi
;
226 rx_status
->mactime
= ath_extend_tsf(sc
, ds
->ds_rxstat
.rs_tstamp
);
227 rx_status
->band
= hw
->conf
.channel
->band
;
228 rx_status
->freq
= hw
->conf
.channel
->center_freq
;
229 rx_status
->noise
= sc
->ani
.noise_floor
;
230 rx_status
->signal
= ATH_DEFAULT_NOISE_FLOOR
+ ds
->ds_rxstat
.rs_rssi
;
231 rx_status
->antenna
= ds
->ds_rxstat
.rs_antenna
;
234 * Theory for reporting quality:
236 * At a hardware RSSI of 45 you will be able to use MCS 7 reliably.
237 * At a hardware RSSI of 45 you will be able to use MCS 15 reliably.
238 * At a hardware RSSI of 35 you should be able use 54 Mbps reliably.
240 * MCS 7 is the highets MCS index usable by a 1-stream device.
241 * MCS 15 is the highest MCS index usable by a 2-stream device.
243 * All ath9k devices are either 1-stream or 2-stream.
245 * How many bars you see is derived from the qual reporting.
247 * A more elaborate scheme can be used here but it requires tables
248 * of SNR/throughput for each possible mode used. For the MCS table
249 * you can refer to the wireless wiki:
251 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
254 if (conf_is_ht(&hw
->conf
))
255 rx_status
->qual
= ds
->ds_rxstat
.rs_rssi
* 100 / 45;
257 rx_status
->qual
= ds
->ds_rxstat
.rs_rssi
* 100 / 35;
259 /* rssi can be more than 45 though, anything above that
260 * should be considered at 100% */
261 if (rx_status
->qual
> 100)
262 rx_status
->qual
= 100;
264 rx_status
->flag
|= RX_FLAG_TSFT
;
271 static void ath_opmode_init(struct ath_softc
*sc
)
273 struct ath_hw
*ah
= sc
->sc_ah
;
274 struct ath_common
*common
= ath9k_hw_common(ah
);
278 /* configure rx filter */
279 rfilt
= ath_calcrxfilter(sc
);
280 ath9k_hw_setrxfilter(ah
, rfilt
);
282 /* configure bssid mask */
283 if (ah
->caps
.hw_caps
& ATH9K_HW_CAP_BSSIDMASK
)
284 ath_hw_setbssidmask(common
);
286 /* configure operational mode */
287 ath9k_hw_setopmode(ah
);
289 /* Handle any link-level address change. */
290 ath9k_hw_setmac(ah
, common
->macaddr
);
292 /* calculate and install multicast filter */
293 mfilt
[0] = mfilt
[1] = ~0;
294 ath9k_hw_setmcastfilter(ah
, mfilt
[0], mfilt
[1]);
297 int ath_rx_init(struct ath_softc
*sc
, int nbufs
)
299 struct ath_common
*common
= ath9k_hw_common(sc
->sc_ah
);
304 spin_lock_init(&sc
->rx
.rxflushlock
);
305 sc
->sc_flags
&= ~SC_OP_RXFLUSH
;
306 spin_lock_init(&sc
->rx
.rxbuflock
);
308 sc
->rx
.bufsize
= roundup(IEEE80211_MAX_MPDU_LEN
,
309 min(common
->cachelsz
, (u16
)64));
311 ath_print(common
, ATH_DBG_CONFIG
, "cachelsz %u rxbufsize %u\n",
312 common
->cachelsz
, sc
->rx
.bufsize
);
314 /* Initialize rx descriptors */
316 error
= ath_descdma_setup(sc
, &sc
->rx
.rxdma
, &sc
->rx
.rxbuf
,
319 ath_print(common
, ATH_DBG_FATAL
,
320 "failed to allocate rx descriptors: %d\n", error
);
324 list_for_each_entry(bf
, &sc
->rx
.rxbuf
, list
) {
325 skb
= ath_rxbuf_alloc(common
, sc
->rx
.bufsize
, GFP_KERNEL
);
332 bf
->bf_buf_addr
= dma_map_single(sc
->dev
, skb
->data
,
335 if (unlikely(dma_mapping_error(sc
->dev
,
337 dev_kfree_skb_any(skb
);
339 ath_print(common
, ATH_DBG_FATAL
,
340 "dma_mapping_error() on RX init\n");
344 bf
->bf_dmacontext
= bf
->bf_buf_addr
;
346 sc
->rx
.rxlink
= NULL
;
355 void ath_rx_cleanup(struct ath_softc
*sc
)
360 list_for_each_entry(bf
, &sc
->rx
.rxbuf
, list
) {
363 dma_unmap_single(sc
->dev
, bf
->bf_buf_addr
,
364 sc
->rx
.bufsize
, DMA_FROM_DEVICE
);
369 if (sc
->rx
.rxdma
.dd_desc_len
!= 0)
370 ath_descdma_cleanup(sc
, &sc
->rx
.rxdma
, &sc
->rx
.rxbuf
);
374 * Calculate the receive filter according to the
375 * operating mode and state:
377 * o always accept unicast, broadcast, and multicast traffic
378 * o maintain current state of phy error reception (the hal
379 * may enable phy error frames for noise immunity work)
380 * o probe request frames are accepted only when operating in
381 * hostap, adhoc, or monitor modes
382 * o enable promiscuous mode according to the interface state
384 * - when operating in adhoc mode so the 802.11 layer creates
385 * node table entries for peers,
386 * - when operating in station mode for collecting rssi data when
387 * the station is otherwise quiet, or
388 * - when operating as a repeater so we see repeater-sta beacons
392 u32
ath_calcrxfilter(struct ath_softc
*sc
)
394 #define RX_FILTER_PRESERVE (ATH9K_RX_FILTER_PHYERR | ATH9K_RX_FILTER_PHYRADAR)
398 rfilt
= (ath9k_hw_getrxfilter(sc
->sc_ah
) & RX_FILTER_PRESERVE
)
399 | ATH9K_RX_FILTER_UCAST
| ATH9K_RX_FILTER_BCAST
400 | ATH9K_RX_FILTER_MCAST
;
402 /* If not a STA, enable processing of Probe Requests */
403 if (sc
->sc_ah
->opmode
!= NL80211_IFTYPE_STATION
)
404 rfilt
|= ATH9K_RX_FILTER_PROBEREQ
;
407 * Set promiscuous mode when FIF_PROMISC_IN_BSS is enabled for station
408 * mode interface or when in monitor mode. AP mode does not need this
409 * since it receives all in-BSS frames anyway.
411 if (((sc
->sc_ah
->opmode
!= NL80211_IFTYPE_AP
) &&
412 (sc
->rx
.rxfilter
& FIF_PROMISC_IN_BSS
)) ||
413 (sc
->sc_ah
->opmode
== NL80211_IFTYPE_MONITOR
))
414 rfilt
|= ATH9K_RX_FILTER_PROM
;
416 if (sc
->rx
.rxfilter
& FIF_CONTROL
)
417 rfilt
|= ATH9K_RX_FILTER_CONTROL
;
419 if ((sc
->sc_ah
->opmode
== NL80211_IFTYPE_STATION
) &&
420 !(sc
->rx
.rxfilter
& FIF_BCN_PRBRESP_PROMISC
))
421 rfilt
|= ATH9K_RX_FILTER_MYBEACON
;
423 rfilt
|= ATH9K_RX_FILTER_BEACON
;
425 if ((AR_SREV_9280_10_OR_LATER(sc
->sc_ah
) ||
426 AR_SREV_9285_10_OR_LATER(sc
->sc_ah
)) &&
427 (sc
->sc_ah
->opmode
== NL80211_IFTYPE_AP
) &&
428 (sc
->rx
.rxfilter
& FIF_PSPOLL
))
429 rfilt
|= ATH9K_RX_FILTER_PSPOLL
;
431 if (conf_is_ht(&sc
->hw
->conf
))
432 rfilt
|= ATH9K_RX_FILTER_COMP_BAR
;
434 if (sc
->sec_wiphy
|| (sc
->rx
.rxfilter
& FIF_OTHER_BSS
)) {
435 /* TODO: only needed if more than one BSSID is in use in
436 * station/adhoc mode */
437 /* The following may also be needed for other older chips */
438 if (sc
->sc_ah
->hw_version
.macVersion
== AR_SREV_VERSION_9160
)
439 rfilt
|= ATH9K_RX_FILTER_PROM
;
440 rfilt
|= ATH9K_RX_FILTER_MCAST_BCAST_ALL
;
445 #undef RX_FILTER_PRESERVE
448 int ath_startrecv(struct ath_softc
*sc
)
450 struct ath_hw
*ah
= sc
->sc_ah
;
451 struct ath_buf
*bf
, *tbf
;
453 spin_lock_bh(&sc
->rx
.rxbuflock
);
454 if (list_empty(&sc
->rx
.rxbuf
))
457 sc
->rx
.rxlink
= NULL
;
458 list_for_each_entry_safe(bf
, tbf
, &sc
->rx
.rxbuf
, list
) {
459 ath_rx_buf_link(sc
, bf
);
462 /* We could have deleted elements so the list may be empty now */
463 if (list_empty(&sc
->rx
.rxbuf
))
466 bf
= list_first_entry(&sc
->rx
.rxbuf
, struct ath_buf
, list
);
467 ath9k_hw_putrxbuf(ah
, bf
->bf_daddr
);
471 spin_unlock_bh(&sc
->rx
.rxbuflock
);
473 ath9k_hw_startpcureceive(ah
);
478 bool ath_stoprecv(struct ath_softc
*sc
)
480 struct ath_hw
*ah
= sc
->sc_ah
;
483 ath9k_hw_stoppcurecv(ah
);
484 ath9k_hw_setrxfilter(ah
, 0);
485 stopped
= ath9k_hw_stopdmarecv(ah
);
486 sc
->rx
.rxlink
= NULL
;
491 void ath_flushrecv(struct ath_softc
*sc
)
493 spin_lock_bh(&sc
->rx
.rxflushlock
);
494 sc
->sc_flags
|= SC_OP_RXFLUSH
;
495 ath_rx_tasklet(sc
, 1);
496 sc
->sc_flags
&= ~SC_OP_RXFLUSH
;
497 spin_unlock_bh(&sc
->rx
.rxflushlock
);
500 static bool ath_beacon_dtim_pending_cab(struct sk_buff
*skb
)
502 /* Check whether the Beacon frame has DTIM indicating buffered bc/mc */
503 struct ieee80211_mgmt
*mgmt
;
504 u8
*pos
, *end
, id
, elen
;
505 struct ieee80211_tim_ie
*tim
;
507 mgmt
= (struct ieee80211_mgmt
*)skb
->data
;
508 pos
= mgmt
->u
.beacon
.variable
;
509 end
= skb
->data
+ skb
->len
;
511 while (pos
+ 2 < end
) {
514 if (pos
+ elen
> end
)
517 if (id
== WLAN_EID_TIM
) {
518 if (elen
< sizeof(*tim
))
520 tim
= (struct ieee80211_tim_ie
*) pos
;
521 if (tim
->dtim_count
!= 0)
523 return tim
->bitmap_ctrl
& 0x01;
532 static void ath_rx_ps_beacon(struct ath_softc
*sc
, struct sk_buff
*skb
)
534 struct ieee80211_mgmt
*mgmt
;
535 struct ath_common
*common
= ath9k_hw_common(sc
->sc_ah
);
537 if (skb
->len
< 24 + 8 + 2 + 2)
540 mgmt
= (struct ieee80211_mgmt
*)skb
->data
;
541 if (memcmp(common
->curbssid
, mgmt
->bssid
, ETH_ALEN
) != 0)
542 return; /* not from our current AP */
544 sc
->sc_flags
&= ~SC_OP_WAIT_FOR_BEACON
;
546 if (sc
->sc_flags
& SC_OP_BEACON_SYNC
) {
547 sc
->sc_flags
&= ~SC_OP_BEACON_SYNC
;
548 ath_print(common
, ATH_DBG_PS
,
549 "Reconfigure Beacon timers based on "
550 "timestamp from the AP\n");
551 ath_beacon_config(sc
, NULL
);
554 if (ath_beacon_dtim_pending_cab(skb
)) {
556 * Remain awake waiting for buffered broadcast/multicast
557 * frames. If the last broadcast/multicast frame is not
558 * received properly, the next beacon frame will work as
559 * a backup trigger for returning into NETWORK SLEEP state,
560 * so we are waiting for it as well.
562 ath_print(common
, ATH_DBG_PS
, "Received DTIM beacon indicating "
563 "buffered broadcast/multicast frame(s)\n");
564 sc
->sc_flags
|= SC_OP_WAIT_FOR_CAB
| SC_OP_WAIT_FOR_BEACON
;
568 if (sc
->sc_flags
& SC_OP_WAIT_FOR_CAB
) {
570 * This can happen if a broadcast frame is dropped or the AP
571 * fails to send a frame indicating that all CAB frames have
574 sc
->sc_flags
&= ~SC_OP_WAIT_FOR_CAB
;
575 ath_print(common
, ATH_DBG_PS
,
576 "PS wait for CAB frames timed out\n");
580 static void ath_rx_ps(struct ath_softc
*sc
, struct sk_buff
*skb
)
582 struct ieee80211_hdr
*hdr
;
583 struct ath_common
*common
= ath9k_hw_common(sc
->sc_ah
);
585 hdr
= (struct ieee80211_hdr
*)skb
->data
;
587 /* Process Beacon and CAB receive in PS state */
588 if ((sc
->sc_flags
& SC_OP_WAIT_FOR_BEACON
) &&
589 ieee80211_is_beacon(hdr
->frame_control
))
590 ath_rx_ps_beacon(sc
, skb
);
591 else if ((sc
->sc_flags
& SC_OP_WAIT_FOR_CAB
) &&
592 (ieee80211_is_data(hdr
->frame_control
) ||
593 ieee80211_is_action(hdr
->frame_control
)) &&
594 is_multicast_ether_addr(hdr
->addr1
) &&
595 !ieee80211_has_moredata(hdr
->frame_control
)) {
597 * No more broadcast/multicast frames to be received at this
600 sc
->sc_flags
&= ~SC_OP_WAIT_FOR_CAB
;
601 ath_print(common
, ATH_DBG_PS
,
602 "All PS CAB frames received, back to sleep\n");
603 } else if ((sc
->sc_flags
& SC_OP_WAIT_FOR_PSPOLL_DATA
) &&
604 !is_multicast_ether_addr(hdr
->addr1
) &&
605 !ieee80211_has_morefrags(hdr
->frame_control
)) {
606 sc
->sc_flags
&= ~SC_OP_WAIT_FOR_PSPOLL_DATA
;
607 ath_print(common
, ATH_DBG_PS
,
608 "Going back to sleep after having received "
609 "PS-Poll data (0x%x)\n",
610 sc
->sc_flags
& (SC_OP_WAIT_FOR_BEACON
|
612 SC_OP_WAIT_FOR_PSPOLL_DATA
|
613 SC_OP_WAIT_FOR_TX_ACK
));
617 static void ath_rx_send_to_mac80211(struct ieee80211_hw
*hw
,
618 struct ath_softc
*sc
, struct sk_buff
*skb
,
619 struct ieee80211_rx_status
*rx_status
)
621 struct ieee80211_hdr
*hdr
;
623 hdr
= (struct ieee80211_hdr
*)skb
->data
;
625 /* Send the frame to mac80211 */
626 if (is_multicast_ether_addr(hdr
->addr1
)) {
629 * Deliver broadcast/multicast frames to all suitable
632 /* TODO: filter based on channel configuration */
633 for (i
= 0; i
< sc
->num_sec_wiphy
; i
++) {
634 struct ath_wiphy
*aphy
= sc
->sec_wiphy
[i
];
635 struct sk_buff
*nskb
;
638 nskb
= skb_copy(skb
, GFP_ATOMIC
);
640 memcpy(IEEE80211_SKB_RXCB(nskb
), rx_status
,
642 ieee80211_rx(aphy
->hw
, nskb
);
645 memcpy(IEEE80211_SKB_RXCB(skb
), rx_status
, sizeof(*rx_status
));
646 ieee80211_rx(sc
->hw
, skb
);
648 /* Deliver unicast frames based on receiver address */
649 memcpy(IEEE80211_SKB_RXCB(skb
), rx_status
, sizeof(*rx_status
));
650 ieee80211_rx(hw
, skb
);
654 int ath_rx_tasklet(struct ath_softc
*sc
, int flush
)
656 #define PA2DESC(_sc, _pa) \
657 ((struct ath_desc *)((caddr_t)(_sc)->rx.rxdma.dd_desc + \
658 ((_pa) - (_sc)->rx.rxdma.dd_desc_paddr)))
662 struct sk_buff
*skb
= NULL
, *requeue_skb
;
663 struct ieee80211_rx_status rx_status
;
664 struct ath_hw
*ah
= sc
->sc_ah
;
665 struct ath_common
*common
= ath9k_hw_common(ah
);
667 * The hw can techncically differ from common->hw when using ath9k
668 * virtual wiphy so to account for that we iterate over the active
669 * wiphys and find the appropriate wiphy and therefore hw.
671 struct ieee80211_hw
*hw
= NULL
;
672 struct ieee80211_hdr
*hdr
;
673 int hdrlen
, padsize
, retval
;
674 bool decrypt_error
= false;
678 spin_lock_bh(&sc
->rx
.rxbuflock
);
681 /* If handling rx interrupt and flush is in progress => exit */
682 if ((sc
->sc_flags
& SC_OP_RXFLUSH
) && (flush
== 0))
685 if (list_empty(&sc
->rx
.rxbuf
)) {
686 sc
->rx
.rxlink
= NULL
;
690 bf
= list_first_entry(&sc
->rx
.rxbuf
, struct ath_buf
, list
);
694 * Must provide the virtual address of the current
695 * descriptor, the physical address, and the virtual
696 * address of the next descriptor in the h/w chain.
697 * This allows the HAL to look ahead to see if the
698 * hardware is done with a descriptor by checking the
699 * done bit in the following descriptor and the address
700 * of the current descriptor the DMA engine is working
701 * on. All this is necessary because of our use of
702 * a self-linked list to avoid rx overruns.
704 retval
= ath9k_hw_rxprocdesc(ah
, ds
,
706 PA2DESC(sc
, ds
->ds_link
),
708 if (retval
== -EINPROGRESS
) {
710 struct ath_desc
*tds
;
712 if (list_is_last(&bf
->list
, &sc
->rx
.rxbuf
)) {
713 sc
->rx
.rxlink
= NULL
;
717 tbf
= list_entry(bf
->list
.next
, struct ath_buf
, list
);
720 * On some hardware the descriptor status words could
721 * get corrupted, including the done bit. Because of
722 * this, check if the next descriptor's done bit is
725 * If the next descriptor's done bit is set, the current
726 * descriptor has been corrupted. Force s/w to discard
727 * this descriptor and continue...
731 retval
= ath9k_hw_rxprocdesc(ah
, tds
, tbf
->bf_daddr
,
732 PA2DESC(sc
, tds
->ds_link
), 0);
733 if (retval
== -EINPROGRESS
) {
743 * Synchronize the DMA transfer with CPU before
744 * 1. accessing the frame
745 * 2. requeueing the same buffer to h/w
747 dma_sync_single_for_cpu(sc
->dev
, bf
->bf_buf_addr
,
751 hdr
= (struct ieee80211_hdr
*) skb
->data
;
752 hw
= ath_get_virt_hw(sc
, hdr
);
755 * If we're asked to flush receive queue, directly
756 * chain it back at the queue without processing it.
761 if (!ds
->ds_rxstat
.rs_datalen
)
764 /* The status portion of the descriptor could get corrupted. */
765 if (sc
->rx
.bufsize
< ds
->ds_rxstat
.rs_datalen
)
768 if (!ath_rx_prepare(hw
, skb
, ds
,
769 &rx_status
, &decrypt_error
, sc
))
772 /* Ensure we always have an skb to requeue once we are done
773 * processing the current buffer's skb */
774 requeue_skb
= ath_rxbuf_alloc(common
, sc
->rx
.bufsize
, GFP_ATOMIC
);
776 /* If there is no memory we ignore the current RX'd frame,
777 * tell hardware it can give us a new frame using the old
778 * skb and put it at the tail of the sc->rx.rxbuf list for
783 /* Unmap the frame */
784 dma_unmap_single(sc
->dev
, bf
->bf_buf_addr
,
788 skb_put(skb
, ds
->ds_rxstat
.rs_datalen
);
790 /* see if any padding is done by the hw and remove it */
791 hdrlen
= ieee80211_get_hdrlen_from_skb(skb
);
792 fc
= hdr
->frame_control
;
794 /* The MAC header is padded to have 32-bit boundary if the
795 * packet payload is non-zero. The general calculation for
796 * padsize would take into account odd header lengths:
797 * padsize = (4 - hdrlen % 4) % 4; However, since only
798 * even-length headers are used, padding can only be 0 or 2
799 * bytes and we can optimize this a bit. In addition, we must
800 * not try to remove padding from short control frames that do
801 * not have payload. */
802 padsize
= hdrlen
& 3;
803 if (padsize
&& hdrlen
>= 24) {
804 memmove(skb
->data
+ padsize
, skb
->data
, hdrlen
);
805 skb_pull(skb
, padsize
);
808 keyix
= ds
->ds_rxstat
.rs_keyix
;
810 if (!(keyix
== ATH9K_RXKEYIX_INVALID
) && !decrypt_error
) {
811 rx_status
.flag
|= RX_FLAG_DECRYPTED
;
812 } else if (ieee80211_has_protected(fc
)
813 && !decrypt_error
&& skb
->len
>= hdrlen
+ 4) {
814 keyix
= skb
->data
[hdrlen
+ 3] >> 6;
816 if (test_bit(keyix
, sc
->keymap
))
817 rx_status
.flag
|= RX_FLAG_DECRYPTED
;
819 if (ah
->sw_mgmt_crypto
&&
820 (rx_status
.flag
& RX_FLAG_DECRYPTED
) &&
821 ieee80211_is_mgmt(fc
)) {
822 /* Use software decrypt for management frames. */
823 rx_status
.flag
&= ~RX_FLAG_DECRYPTED
;
826 /* We will now give hardware our shiny new allocated skb */
827 bf
->bf_mpdu
= requeue_skb
;
828 bf
->bf_buf_addr
= dma_map_single(sc
->dev
, requeue_skb
->data
,
831 if (unlikely(dma_mapping_error(sc
->dev
,
833 dev_kfree_skb_any(requeue_skb
);
835 ath_print(common
, ATH_DBG_FATAL
,
836 "dma_mapping_error() on RX\n");
837 ath_rx_send_to_mac80211(hw
, sc
, skb
, &rx_status
);
840 bf
->bf_dmacontext
= bf
->bf_buf_addr
;
843 * change the default rx antenna if rx diversity chooses the
844 * other antenna 3 times in a row.
846 if (sc
->rx
.defant
!= ds
->ds_rxstat
.rs_antenna
) {
847 if (++sc
->rx
.rxotherant
>= 3)
848 ath_setdefantenna(sc
, ds
->ds_rxstat
.rs_antenna
);
850 sc
->rx
.rxotherant
= 0;
853 if (unlikely(sc
->sc_flags
& (SC_OP_WAIT_FOR_BEACON
|
855 SC_OP_WAIT_FOR_PSPOLL_DATA
)))
858 ath_rx_send_to_mac80211(hw
, sc
, skb
, &rx_status
);
861 list_move_tail(&bf
->list
, &sc
->rx
.rxbuf
);
862 ath_rx_buf_link(sc
, bf
);
865 spin_unlock_bh(&sc
->rx
.rxbuflock
);