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 * For Decrypt or Demic errors, we only mark packet status here and always push
91 * up the frame up to let mac80211 handle the actual error case, be it no
92 * decryption key or real decryption error. This let us keep statistics there.
94 static int ath_rx_prepare(struct ath_common *common,
95 struct ieee80211_hw *hw,
96 struct sk_buff *skb, struct ath_rx_status *rx_stats,
97 struct ieee80211_rx_status *rx_status,
100 struct ath_hw *ah = common->ah;
101 struct ieee80211_hdr *hdr;
104 struct ieee80211_sta *sta;
106 int last_rssi = ATH_RSSI_DUMMY_MARKER;
108 hdr = (struct ieee80211_hdr *)skb->data;
109 fc = hdr->frame_control;
110 memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
112 if (rx_stats->rs_more) {
114 * Frame spans multiple descriptors; this cannot happen yet
115 * as we don't support jumbograms. If not in monitor mode,
116 * discard the frame. Enable this if you want to see
117 * error frames in Monitor mode.
119 if (ah->opmode != NL80211_IFTYPE_MONITOR)
121 } else if (rx_stats->rs_status != 0) {
122 if (rx_stats->rs_status & ATH9K_RXERR_CRC)
123 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
124 if (rx_stats->rs_status & ATH9K_RXERR_PHY)
127 if (rx_stats->rs_status & ATH9K_RXERR_DECRYPT) {
128 *decrypt_error = true;
129 } else if (rx_stats->rs_status & ATH9K_RXERR_MIC) {
130 if (ieee80211_is_ctl(fc))
132 * Sometimes, we get invalid
133 * MIC failures on valid control frames.
134 * Remove these mic errors.
136 rx_stats->rs_status &= ~ATH9K_RXERR_MIC;
138 rx_status->flag |= RX_FLAG_MMIC_ERROR;
141 * Reject error frames with the exception of
142 * decryption and MIC failures. For monitor mode,
143 * we also ignore the CRC error.
145 if (ah->opmode == NL80211_IFTYPE_MONITOR) {
146 if (rx_stats->rs_status &
147 ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC |
151 if (rx_stats->rs_status &
152 ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) {
158 ratecode = rx_stats->rs_rate;
160 if (ratecode & 0x80) {
162 rx_status->flag |= RX_FLAG_HT;
163 if (rx_stats->rs_flags & ATH9K_RX_2040)
164 rx_status->flag |= RX_FLAG_40MHZ;
165 if (rx_stats->rs_flags & ATH9K_RX_GI)
166 rx_status->flag |= RX_FLAG_SHORT_GI;
167 rx_status->rate_idx = ratecode & 0x7f;
169 struct ieee80211_supported_band *sband;
171 enum ieee80211_band band;
173 band = hw->conf.channel->band;
174 sband = hw->wiphy->bands[band];
176 for (i = 0; i < sband->n_bitrates; i++) {
177 if (sband->bitrates[i].hw_value == rx_stats->rs_rate) {
178 rx_status->rate_idx = i;
181 if (sband->bitrates[i].hw_value_short ==
183 rx_status->rate_idx = i;
184 rx_status->flag |= RX_FLAG_SHORTPRE;
191 /* XXX: use ieee80211_find_sta! */
192 sta = ieee80211_find_sta_by_hw(hw, hdr->addr2);
194 an = (struct ath_node *) sta->drv_priv;
195 if (rx_stats->rs_rssi != ATH9K_RSSI_BAD &&
196 !rx_stats->rs_moreaggr)
197 ATH_RSSI_LPF(an->last_rssi, rx_stats->rs_rssi);
198 last_rssi = an->last_rssi;
202 if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER))
203 rx_stats->rs_rssi = ATH_EP_RND(last_rssi,
204 ATH_RSSI_EP_MULTIPLIER);
205 if (rx_stats->rs_rssi < 0)
206 rx_stats->rs_rssi = 0;
207 else if (rx_stats->rs_rssi > 127)
208 rx_stats->rs_rssi = 127;
210 /* Update Beacon RSSI, this is used by ANI. */
211 if (ieee80211_is_beacon(fc))
212 ah->stats.avgbrssi = rx_stats->rs_rssi;
214 rx_status->mactime = ath9k_hw_extend_tsf(ah, rx_stats->rs_tstamp);
215 rx_status->band = hw->conf.channel->band;
216 rx_status->freq = hw->conf.channel->center_freq;
217 rx_status->noise = common->ani.noise_floor;
218 rx_status->signal = ATH_DEFAULT_NOISE_FLOOR + rx_stats->rs_rssi;
219 rx_status->antenna = rx_stats->rs_antenna;
222 * Theory for reporting quality:
224 * At a hardware RSSI of 45 you will be able to use MCS 7 reliably.
225 * At a hardware RSSI of 45 you will be able to use MCS 15 reliably.
226 * At a hardware RSSI of 35 you should be able use 54 Mbps reliably.
228 * MCS 7 is the highets MCS index usable by a 1-stream device.
229 * MCS 15 is the highest MCS index usable by a 2-stream device.
231 * All ath9k devices are either 1-stream or 2-stream.
233 * How many bars you see is derived from the qual reporting.
235 * A more elaborate scheme can be used here but it requires tables
236 * of SNR/throughput for each possible mode used. For the MCS table
237 * you can refer to the wireless wiki:
239 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
242 if (conf_is_ht(&hw->conf))
243 rx_status->qual = rx_stats->rs_rssi * 100 / 45;
245 rx_status->qual = rx_stats->rs_rssi * 100 / 35;
247 /* rssi can be more than 45 though, anything above that
248 * should be considered at 100% */
249 if (rx_status->qual > 100)
250 rx_status->qual = 100;
252 rx_status->flag |= RX_FLAG_TSFT;
259 static void ath_opmode_init(struct ath_softc *sc)
261 struct ath_hw *ah = sc->sc_ah;
262 struct ath_common *common = ath9k_hw_common(ah);
266 /* configure rx filter */
267 rfilt = ath_calcrxfilter(sc);
268 ath9k_hw_setrxfilter(ah, rfilt);
270 /* configure bssid mask */
271 if (ah->caps.hw_caps & ATH9K_HW_CAP_BSSIDMASK)
272 ath_hw_setbssidmask(common);
274 /* configure operational mode */
275 ath9k_hw_setopmode(ah);
277 /* Handle any link-level address change. */
278 ath9k_hw_setmac(ah, common->macaddr);
280 /* calculate and install multicast filter */
281 mfilt[0] = mfilt[1] = ~0;
282 ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]);
285 int ath_rx_init(struct ath_softc *sc, int nbufs)
287 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
292 spin_lock_init(&sc->rx.rxflushlock);
293 sc->sc_flags &= ~SC_OP_RXFLUSH;
294 spin_lock_init(&sc->rx.rxbuflock);
296 sc->rx.bufsize = roundup(IEEE80211_MAX_MPDU_LEN,
297 min(common->cachelsz, (u16)64));
299 ath_print(common, ATH_DBG_CONFIG, "cachelsz %u rxbufsize %u\n",
300 common->cachelsz, sc->rx.bufsize);
302 /* Initialize rx descriptors */
304 error = ath_descdma_setup(sc, &sc->rx.rxdma, &sc->rx.rxbuf,
307 ath_print(common, ATH_DBG_FATAL,
308 "failed to allocate rx descriptors: %d\n", error);
312 list_for_each_entry(bf, &sc->rx.rxbuf, list) {
313 skb = ath_rxbuf_alloc(common, sc->rx.bufsize, GFP_KERNEL);
320 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
323 if (unlikely(dma_mapping_error(sc->dev,
325 dev_kfree_skb_any(skb);
327 ath_print(common, ATH_DBG_FATAL,
328 "dma_mapping_error() on RX init\n");
332 bf->bf_dmacontext = bf->bf_buf_addr;
334 sc->rx.rxlink = NULL;
343 void ath_rx_cleanup(struct ath_softc *sc)
348 list_for_each_entry(bf, &sc->rx.rxbuf, list) {
351 dma_unmap_single(sc->dev, bf->bf_buf_addr,
352 sc->rx.bufsize, DMA_FROM_DEVICE);
357 if (sc->rx.rxdma.dd_desc_len != 0)
358 ath_descdma_cleanup(sc, &sc->rx.rxdma, &sc->rx.rxbuf);
362 * Calculate the receive filter according to the
363 * operating mode and state:
365 * o always accept unicast, broadcast, and multicast traffic
366 * o maintain current state of phy error reception (the hal
367 * may enable phy error frames for noise immunity work)
368 * o probe request frames are accepted only when operating in
369 * hostap, adhoc, or monitor modes
370 * o enable promiscuous mode according to the interface state
372 * - when operating in adhoc mode so the 802.11 layer creates
373 * node table entries for peers,
374 * - when operating in station mode for collecting rssi data when
375 * the station is otherwise quiet, or
376 * - when operating as a repeater so we see repeater-sta beacons
380 u32 ath_calcrxfilter(struct ath_softc *sc)
382 #define RX_FILTER_PRESERVE (ATH9K_RX_FILTER_PHYERR | ATH9K_RX_FILTER_PHYRADAR)
386 rfilt = (ath9k_hw_getrxfilter(sc->sc_ah) & RX_FILTER_PRESERVE)
387 | ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST
388 | ATH9K_RX_FILTER_MCAST;
390 /* If not a STA, enable processing of Probe Requests */
391 if (sc->sc_ah->opmode != NL80211_IFTYPE_STATION)
392 rfilt |= ATH9K_RX_FILTER_PROBEREQ;
395 * Set promiscuous mode when FIF_PROMISC_IN_BSS is enabled for station
396 * mode interface or when in monitor mode. AP mode does not need this
397 * since it receives all in-BSS frames anyway.
399 if (((sc->sc_ah->opmode != NL80211_IFTYPE_AP) &&
400 (sc->rx.rxfilter & FIF_PROMISC_IN_BSS)) ||
401 (sc->sc_ah->opmode == NL80211_IFTYPE_MONITOR))
402 rfilt |= ATH9K_RX_FILTER_PROM;
404 if (sc->rx.rxfilter & FIF_CONTROL)
405 rfilt |= ATH9K_RX_FILTER_CONTROL;
407 if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) &&
408 !(sc->rx.rxfilter & FIF_BCN_PRBRESP_PROMISC))
409 rfilt |= ATH9K_RX_FILTER_MYBEACON;
411 rfilt |= ATH9K_RX_FILTER_BEACON;
413 if ((AR_SREV_9280_10_OR_LATER(sc->sc_ah) ||
414 AR_SREV_9285_10_OR_LATER(sc->sc_ah)) &&
415 (sc->sc_ah->opmode == NL80211_IFTYPE_AP) &&
416 (sc->rx.rxfilter & FIF_PSPOLL))
417 rfilt |= ATH9K_RX_FILTER_PSPOLL;
419 if (conf_is_ht(&sc->hw->conf))
420 rfilt |= ATH9K_RX_FILTER_COMP_BAR;
422 if (sc->sec_wiphy || (sc->rx.rxfilter & FIF_OTHER_BSS)) {
423 /* TODO: only needed if more than one BSSID is in use in
424 * station/adhoc mode */
425 /* The following may also be needed for other older chips */
426 if (sc->sc_ah->hw_version.macVersion == AR_SREV_VERSION_9160)
427 rfilt |= ATH9K_RX_FILTER_PROM;
428 rfilt |= ATH9K_RX_FILTER_MCAST_BCAST_ALL;
433 #undef RX_FILTER_PRESERVE
436 int ath_startrecv(struct ath_softc *sc)
438 struct ath_hw *ah = sc->sc_ah;
439 struct ath_buf *bf, *tbf;
441 spin_lock_bh(&sc->rx.rxbuflock);
442 if (list_empty(&sc->rx.rxbuf))
445 sc->rx.rxlink = NULL;
446 list_for_each_entry_safe(bf, tbf, &sc->rx.rxbuf, list) {
447 ath_rx_buf_link(sc, bf);
450 /* We could have deleted elements so the list may be empty now */
451 if (list_empty(&sc->rx.rxbuf))
454 bf = list_first_entry(&sc->rx.rxbuf, struct ath_buf, list);
455 ath9k_hw_putrxbuf(ah, bf->bf_daddr);
459 spin_unlock_bh(&sc->rx.rxbuflock);
461 ath9k_hw_startpcureceive(ah);
466 bool ath_stoprecv(struct ath_softc *sc)
468 struct ath_hw *ah = sc->sc_ah;
471 ath9k_hw_stoppcurecv(ah);
472 ath9k_hw_setrxfilter(ah, 0);
473 stopped = ath9k_hw_stopdmarecv(ah);
474 sc->rx.rxlink = NULL;
479 void ath_flushrecv(struct ath_softc *sc)
481 spin_lock_bh(&sc->rx.rxflushlock);
482 sc->sc_flags |= SC_OP_RXFLUSH;
483 ath_rx_tasklet(sc, 1);
484 sc->sc_flags &= ~SC_OP_RXFLUSH;
485 spin_unlock_bh(&sc->rx.rxflushlock);
488 static bool ath_beacon_dtim_pending_cab(struct sk_buff *skb)
490 /* Check whether the Beacon frame has DTIM indicating buffered bc/mc */
491 struct ieee80211_mgmt *mgmt;
492 u8 *pos, *end, id, elen;
493 struct ieee80211_tim_ie *tim;
495 mgmt = (struct ieee80211_mgmt *)skb->data;
496 pos = mgmt->u.beacon.variable;
497 end = skb->data + skb->len;
499 while (pos + 2 < end) {
502 if (pos + elen > end)
505 if (id == WLAN_EID_TIM) {
506 if (elen < sizeof(*tim))
508 tim = (struct ieee80211_tim_ie *) pos;
509 if (tim->dtim_count != 0)
511 return tim->bitmap_ctrl & 0x01;
520 static void ath_rx_ps_beacon(struct ath_softc *sc, struct sk_buff *skb)
522 struct ieee80211_mgmt *mgmt;
523 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
525 if (skb->len < 24 + 8 + 2 + 2)
528 mgmt = (struct ieee80211_mgmt *)skb->data;
529 if (memcmp(common->curbssid, mgmt->bssid, ETH_ALEN) != 0)
530 return; /* not from our current AP */
532 sc->sc_flags &= ~SC_OP_WAIT_FOR_BEACON;
534 if (sc->sc_flags & SC_OP_BEACON_SYNC) {
535 sc->sc_flags &= ~SC_OP_BEACON_SYNC;
536 ath_print(common, ATH_DBG_PS,
537 "Reconfigure Beacon timers based on "
538 "timestamp from the AP\n");
539 ath_beacon_config(sc, NULL);
542 if (ath_beacon_dtim_pending_cab(skb)) {
544 * Remain awake waiting for buffered broadcast/multicast
545 * frames. If the last broadcast/multicast frame is not
546 * received properly, the next beacon frame will work as
547 * a backup trigger for returning into NETWORK SLEEP state,
548 * so we are waiting for it as well.
550 ath_print(common, ATH_DBG_PS, "Received DTIM beacon indicating "
551 "buffered broadcast/multicast frame(s)\n");
552 sc->sc_flags |= SC_OP_WAIT_FOR_CAB | SC_OP_WAIT_FOR_BEACON;
556 if (sc->sc_flags & SC_OP_WAIT_FOR_CAB) {
558 * This can happen if a broadcast frame is dropped or the AP
559 * fails to send a frame indicating that all CAB frames have
562 sc->sc_flags &= ~SC_OP_WAIT_FOR_CAB;
563 ath_print(common, ATH_DBG_PS,
564 "PS wait for CAB frames timed out\n");
568 static void ath_rx_ps(struct ath_softc *sc, struct sk_buff *skb)
570 struct ieee80211_hdr *hdr;
571 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
573 hdr = (struct ieee80211_hdr *)skb->data;
575 /* Process Beacon and CAB receive in PS state */
576 if ((sc->sc_flags & SC_OP_WAIT_FOR_BEACON) &&
577 ieee80211_is_beacon(hdr->frame_control))
578 ath_rx_ps_beacon(sc, skb);
579 else if ((sc->sc_flags & SC_OP_WAIT_FOR_CAB) &&
580 (ieee80211_is_data(hdr->frame_control) ||
581 ieee80211_is_action(hdr->frame_control)) &&
582 is_multicast_ether_addr(hdr->addr1) &&
583 !ieee80211_has_moredata(hdr->frame_control)) {
585 * No more broadcast/multicast frames to be received at this
588 sc->sc_flags &= ~SC_OP_WAIT_FOR_CAB;
589 ath_print(common, ATH_DBG_PS,
590 "All PS CAB frames received, back to sleep\n");
591 } else if ((sc->sc_flags & SC_OP_WAIT_FOR_PSPOLL_DATA) &&
592 !is_multicast_ether_addr(hdr->addr1) &&
593 !ieee80211_has_morefrags(hdr->frame_control)) {
594 sc->sc_flags &= ~SC_OP_WAIT_FOR_PSPOLL_DATA;
595 ath_print(common, ATH_DBG_PS,
596 "Going back to sleep after having received "
597 "PS-Poll data (0x%x)\n",
598 sc->sc_flags & (SC_OP_WAIT_FOR_BEACON |
600 SC_OP_WAIT_FOR_PSPOLL_DATA |
601 SC_OP_WAIT_FOR_TX_ACK));
605 static void ath_rx_send_to_mac80211(struct ieee80211_hw *hw,
606 struct ath_softc *sc, struct sk_buff *skb,
607 struct ieee80211_rx_status *rx_status)
609 struct ieee80211_hdr *hdr;
611 hdr = (struct ieee80211_hdr *)skb->data;
613 /* Send the frame to mac80211 */
614 if (is_multicast_ether_addr(hdr->addr1)) {
617 * Deliver broadcast/multicast frames to all suitable
620 /* TODO: filter based on channel configuration */
621 for (i = 0; i < sc->num_sec_wiphy; i++) {
622 struct ath_wiphy *aphy = sc->sec_wiphy[i];
623 struct sk_buff *nskb;
626 nskb = skb_copy(skb, GFP_ATOMIC);
628 memcpy(IEEE80211_SKB_RXCB(nskb), rx_status,
630 ieee80211_rx(aphy->hw, nskb);
633 memcpy(IEEE80211_SKB_RXCB(skb), rx_status, sizeof(*rx_status));
634 ieee80211_rx(sc->hw, skb);
636 /* Deliver unicast frames based on receiver address */
637 memcpy(IEEE80211_SKB_RXCB(skb), rx_status, sizeof(*rx_status));
638 ieee80211_rx(hw, skb);
642 int ath_rx_tasklet(struct ath_softc *sc, int flush)
644 #define PA2DESC(_sc, _pa) \
645 ((struct ath_desc *)((caddr_t)(_sc)->rx.rxdma.dd_desc + \
646 ((_pa) - (_sc)->rx.rxdma.dd_desc_paddr)))
650 struct ath_rx_status *rx_stats;
651 struct sk_buff *skb = NULL, *requeue_skb;
652 struct ieee80211_rx_status rx_status;
653 struct ath_hw *ah = sc->sc_ah;
654 struct ath_common *common = ath9k_hw_common(ah);
656 * The hw can techncically differ from common->hw when using ath9k
657 * virtual wiphy so to account for that we iterate over the active
658 * wiphys and find the appropriate wiphy and therefore hw.
660 struct ieee80211_hw *hw = NULL;
661 struct ieee80211_hdr *hdr;
662 int hdrlen, padsize, retval;
663 bool decrypt_error = false;
667 spin_lock_bh(&sc->rx.rxbuflock);
670 /* If handling rx interrupt and flush is in progress => exit */
671 if ((sc->sc_flags & SC_OP_RXFLUSH) && (flush == 0))
674 if (list_empty(&sc->rx.rxbuf)) {
675 sc->rx.rxlink = NULL;
679 bf = list_first_entry(&sc->rx.rxbuf, struct ath_buf, list);
683 * Must provide the virtual address of the current
684 * descriptor, the physical address, and the virtual
685 * address of the next descriptor in the h/w chain.
686 * This allows the HAL to look ahead to see if the
687 * hardware is done with a descriptor by checking the
688 * done bit in the following descriptor and the address
689 * of the current descriptor the DMA engine is working
690 * on. All this is necessary because of our use of
691 * a self-linked list to avoid rx overruns.
693 retval = ath9k_hw_rxprocdesc(ah, ds,
695 PA2DESC(sc, ds->ds_link),
697 if (retval == -EINPROGRESS) {
699 struct ath_desc *tds;
701 if (list_is_last(&bf->list, &sc->rx.rxbuf)) {
702 sc->rx.rxlink = NULL;
706 tbf = list_entry(bf->list.next, struct ath_buf, list);
709 * On some hardware the descriptor status words could
710 * get corrupted, including the done bit. Because of
711 * this, check if the next descriptor's done bit is
714 * If the next descriptor's done bit is set, the current
715 * descriptor has been corrupted. Force s/w to discard
716 * this descriptor and continue...
720 retval = ath9k_hw_rxprocdesc(ah, tds, tbf->bf_daddr,
721 PA2DESC(sc, tds->ds_link), 0);
722 if (retval == -EINPROGRESS) {
732 * Synchronize the DMA transfer with CPU before
733 * 1. accessing the frame
734 * 2. requeueing the same buffer to h/w
736 dma_sync_single_for_cpu(sc->dev, bf->bf_buf_addr,
740 hdr = (struct ieee80211_hdr *) skb->data;
741 hw = ath_get_virt_hw(sc, hdr);
742 rx_stats = &ds->ds_rxstat;
745 * If we're asked to flush receive queue, directly
746 * chain it back at the queue without processing it.
751 if (!rx_stats->rs_datalen)
754 /* The status portion of the descriptor could get corrupted. */
755 if (sc->rx.bufsize < rx_stats->rs_datalen)
758 if (!ath_rx_prepare(common, hw, skb, rx_stats,
759 &rx_status, &decrypt_error))
762 /* Ensure we always have an skb to requeue once we are done
763 * processing the current buffer's skb */
764 requeue_skb = ath_rxbuf_alloc(common, sc->rx.bufsize, GFP_ATOMIC);
766 /* If there is no memory we ignore the current RX'd frame,
767 * tell hardware it can give us a new frame using the old
768 * skb and put it at the tail of the sc->rx.rxbuf list for
773 /* Unmap the frame */
774 dma_unmap_single(sc->dev, bf->bf_buf_addr,
778 skb_put(skb, rx_stats->rs_datalen);
780 /* see if any padding is done by the hw and remove it */
781 hdrlen = ieee80211_get_hdrlen_from_skb(skb);
782 fc = hdr->frame_control;
784 /* The MAC header is padded to have 32-bit boundary if the
785 * packet payload is non-zero. The general calculation for
786 * padsize would take into account odd header lengths:
787 * padsize = (4 - hdrlen % 4) % 4; However, since only
788 * even-length headers are used, padding can only be 0 or 2
789 * bytes and we can optimize this a bit. In addition, we must
790 * not try to remove padding from short control frames that do
791 * not have payload. */
792 padsize = hdrlen & 3;
793 if (padsize && hdrlen >= 24) {
794 memmove(skb->data + padsize, skb->data, hdrlen);
795 skb_pull(skb, padsize);
798 keyix = rx_stats->rs_keyix;
800 if (!(keyix == ATH9K_RXKEYIX_INVALID) && !decrypt_error) {
801 rx_status.flag |= RX_FLAG_DECRYPTED;
802 } else if (ieee80211_has_protected(fc)
803 && !decrypt_error && skb->len >= hdrlen + 4) {
804 keyix = skb->data[hdrlen + 3] >> 6;
806 if (test_bit(keyix, sc->keymap))
807 rx_status.flag |= RX_FLAG_DECRYPTED;
809 if (ah->sw_mgmt_crypto &&
810 (rx_status.flag & RX_FLAG_DECRYPTED) &&
811 ieee80211_is_mgmt(fc)) {
812 /* Use software decrypt for management frames. */
813 rx_status.flag &= ~RX_FLAG_DECRYPTED;
816 /* We will now give hardware our shiny new allocated skb */
817 bf->bf_mpdu = requeue_skb;
818 bf->bf_buf_addr = dma_map_single(sc->dev, requeue_skb->data,
821 if (unlikely(dma_mapping_error(sc->dev,
823 dev_kfree_skb_any(requeue_skb);
825 ath_print(common, ATH_DBG_FATAL,
826 "dma_mapping_error() on RX\n");
827 ath_rx_send_to_mac80211(hw, sc, skb, &rx_status);
830 bf->bf_dmacontext = bf->bf_buf_addr;
833 * change the default rx antenna if rx diversity chooses the
834 * other antenna 3 times in a row.
836 if (sc->rx.defant != ds->ds_rxstat.rs_antenna) {
837 if (++sc->rx.rxotherant >= 3)
838 ath_setdefantenna(sc, rx_stats->rs_antenna);
840 sc->rx.rxotherant = 0;
843 if (unlikely(sc->sc_flags & (SC_OP_WAIT_FOR_BEACON |
845 SC_OP_WAIT_FOR_PSPOLL_DATA)))
848 ath_rx_send_to_mac80211(hw, sc, skb, &rx_status);
851 list_move_tail(&bf->list, &sc->rx.rxbuf);
852 ath_rx_buf_link(sc, bf);
855 spin_unlock_bh(&sc->rx.rxbuflock);