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 ieee80211_hw *hw,
95 struct sk_buff *skb, struct ath_rx_status *rx_stats,
96 struct ieee80211_rx_status *rx_status, bool *decrypt_error,
99 struct ieee80211_hdr *hdr;
102 struct ieee80211_sta *sta;
104 int last_rssi = ATH_RSSI_DUMMY_MARKER;
106 hdr = (struct ieee80211_hdr *)skb->data;
107 fc = hdr->frame_control;
108 memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
110 if (rx_stats->rs_more) {
112 * Frame spans multiple descriptors; this cannot happen yet
113 * as we don't support jumbograms. If not in monitor mode,
114 * discard the frame. Enable this if you want to see
115 * error frames in Monitor mode.
117 if (sc->sc_ah->opmode != NL80211_IFTYPE_MONITOR)
119 } else if (rx_stats->rs_status != 0) {
120 if (rx_stats->rs_status & ATH9K_RXERR_CRC)
121 rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
122 if (rx_stats->rs_status & ATH9K_RXERR_PHY)
125 if (rx_stats->rs_status & ATH9K_RXERR_DECRYPT) {
126 *decrypt_error = true;
127 } else if (rx_stats->rs_status & ATH9K_RXERR_MIC) {
128 if (ieee80211_is_ctl(fc))
130 * Sometimes, we get invalid
131 * MIC failures on valid control frames.
132 * Remove these mic errors.
134 rx_stats->rs_status &= ~ATH9K_RXERR_MIC;
136 rx_status->flag |= RX_FLAG_MMIC_ERROR;
139 * Reject error frames with the exception of
140 * decryption and MIC failures. For monitor mode,
141 * we also ignore the CRC error.
143 if (sc->sc_ah->opmode == NL80211_IFTYPE_MONITOR) {
144 if (rx_stats->rs_status &
145 ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC |
149 if (rx_stats->rs_status &
150 ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) {
156 ratecode = rx_stats->rs_rate;
158 if (ratecode & 0x80) {
160 rx_status->flag |= RX_FLAG_HT;
161 if (rx_stats->rs_flags & ATH9K_RX_2040)
162 rx_status->flag |= RX_FLAG_40MHZ;
163 if (rx_stats->rs_flags & ATH9K_RX_GI)
164 rx_status->flag |= RX_FLAG_SHORT_GI;
165 rx_status->rate_idx = ratecode & 0x7f;
167 int i = 0, cur_band, n_rates;
169 cur_band = hw->conf.channel->band;
170 n_rates = sc->sbands[cur_band].n_bitrates;
172 for (i = 0; i < n_rates; i++) {
173 if (sc->sbands[cur_band].bitrates[i].hw_value ==
175 rx_status->rate_idx = i;
179 if (sc->sbands[cur_band].bitrates[i].hw_value_short ==
181 rx_status->rate_idx = i;
182 rx_status->flag |= RX_FLAG_SHORTPRE;
189 /* XXX: use ieee80211_find_sta! */
190 sta = ieee80211_find_sta_by_hw(hw, hdr->addr2);
192 an = (struct ath_node *) sta->drv_priv;
193 if (rx_stats->rs_rssi != ATH9K_RSSI_BAD &&
194 !rx_stats->rs_moreaggr)
195 ATH_RSSI_LPF(an->last_rssi, rx_stats->rs_rssi);
196 last_rssi = an->last_rssi;
200 if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER))
201 rx_stats->rs_rssi = ATH_EP_RND(last_rssi,
202 ATH_RSSI_EP_MULTIPLIER);
203 if (rx_stats->rs_rssi < 0)
204 rx_stats->rs_rssi = 0;
205 else if (rx_stats->rs_rssi > 127)
206 rx_stats->rs_rssi = 127;
208 /* Update Beacon RSSI, this is used by ANI. */
209 if (ieee80211_is_beacon(fc))
210 sc->sc_ah->stats.avgbrssi = rx_stats->rs_rssi;
212 rx_status->mactime = ath9k_hw_extend_tsf(sc->sc_ah, rx_stats->rs_tstamp);
213 rx_status->band = hw->conf.channel->band;
214 rx_status->freq = hw->conf.channel->center_freq;
215 rx_status->noise = sc->ani.noise_floor;
216 rx_status->signal = ATH_DEFAULT_NOISE_FLOOR + rx_stats->rs_rssi;
217 rx_status->antenna = rx_stats->rs_antenna;
220 * Theory for reporting quality:
222 * At a hardware RSSI of 45 you will be able to use MCS 7 reliably.
223 * At a hardware RSSI of 45 you will be able to use MCS 15 reliably.
224 * At a hardware RSSI of 35 you should be able use 54 Mbps reliably.
226 * MCS 7 is the highets MCS index usable by a 1-stream device.
227 * MCS 15 is the highest MCS index usable by a 2-stream device.
229 * All ath9k devices are either 1-stream or 2-stream.
231 * How many bars you see is derived from the qual reporting.
233 * A more elaborate scheme can be used here but it requires tables
234 * of SNR/throughput for each possible mode used. For the MCS table
235 * you can refer to the wireless wiki:
237 * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n
240 if (conf_is_ht(&hw->conf))
241 rx_status->qual = rx_stats->rs_rssi * 100 / 45;
243 rx_status->qual = rx_stats->rs_rssi * 100 / 35;
245 /* rssi can be more than 45 though, anything above that
246 * should be considered at 100% */
247 if (rx_status->qual > 100)
248 rx_status->qual = 100;
250 rx_status->flag |= RX_FLAG_TSFT;
257 static void ath_opmode_init(struct ath_softc *sc)
259 struct ath_hw *ah = sc->sc_ah;
260 struct ath_common *common = ath9k_hw_common(ah);
264 /* configure rx filter */
265 rfilt = ath_calcrxfilter(sc);
266 ath9k_hw_setrxfilter(ah, rfilt);
268 /* configure bssid mask */
269 if (ah->caps.hw_caps & ATH9K_HW_CAP_BSSIDMASK)
270 ath_hw_setbssidmask(common);
272 /* configure operational mode */
273 ath9k_hw_setopmode(ah);
275 /* Handle any link-level address change. */
276 ath9k_hw_setmac(ah, common->macaddr);
278 /* calculate and install multicast filter */
279 mfilt[0] = mfilt[1] = ~0;
280 ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]);
283 int ath_rx_init(struct ath_softc *sc, int nbufs)
285 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
290 spin_lock_init(&sc->rx.rxflushlock);
291 sc->sc_flags &= ~SC_OP_RXFLUSH;
292 spin_lock_init(&sc->rx.rxbuflock);
294 sc->rx.bufsize = roundup(IEEE80211_MAX_MPDU_LEN,
295 min(common->cachelsz, (u16)64));
297 ath_print(common, ATH_DBG_CONFIG, "cachelsz %u rxbufsize %u\n",
298 common->cachelsz, sc->rx.bufsize);
300 /* Initialize rx descriptors */
302 error = ath_descdma_setup(sc, &sc->rx.rxdma, &sc->rx.rxbuf,
305 ath_print(common, ATH_DBG_FATAL,
306 "failed to allocate rx descriptors: %d\n", error);
310 list_for_each_entry(bf, &sc->rx.rxbuf, list) {
311 skb = ath_rxbuf_alloc(common, sc->rx.bufsize, GFP_KERNEL);
318 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
321 if (unlikely(dma_mapping_error(sc->dev,
323 dev_kfree_skb_any(skb);
325 ath_print(common, ATH_DBG_FATAL,
326 "dma_mapping_error() on RX init\n");
330 bf->bf_dmacontext = bf->bf_buf_addr;
332 sc->rx.rxlink = NULL;
341 void ath_rx_cleanup(struct ath_softc *sc)
346 list_for_each_entry(bf, &sc->rx.rxbuf, list) {
349 dma_unmap_single(sc->dev, bf->bf_buf_addr,
350 sc->rx.bufsize, DMA_FROM_DEVICE);
355 if (sc->rx.rxdma.dd_desc_len != 0)
356 ath_descdma_cleanup(sc, &sc->rx.rxdma, &sc->rx.rxbuf);
360 * Calculate the receive filter according to the
361 * operating mode and state:
363 * o always accept unicast, broadcast, and multicast traffic
364 * o maintain current state of phy error reception (the hal
365 * may enable phy error frames for noise immunity work)
366 * o probe request frames are accepted only when operating in
367 * hostap, adhoc, or monitor modes
368 * o enable promiscuous mode according to the interface state
370 * - when operating in adhoc mode so the 802.11 layer creates
371 * node table entries for peers,
372 * - when operating in station mode for collecting rssi data when
373 * the station is otherwise quiet, or
374 * - when operating as a repeater so we see repeater-sta beacons
378 u32 ath_calcrxfilter(struct ath_softc *sc)
380 #define RX_FILTER_PRESERVE (ATH9K_RX_FILTER_PHYERR | ATH9K_RX_FILTER_PHYRADAR)
384 rfilt = (ath9k_hw_getrxfilter(sc->sc_ah) & RX_FILTER_PRESERVE)
385 | ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST
386 | ATH9K_RX_FILTER_MCAST;
388 /* If not a STA, enable processing of Probe Requests */
389 if (sc->sc_ah->opmode != NL80211_IFTYPE_STATION)
390 rfilt |= ATH9K_RX_FILTER_PROBEREQ;
393 * Set promiscuous mode when FIF_PROMISC_IN_BSS is enabled for station
394 * mode interface or when in monitor mode. AP mode does not need this
395 * since it receives all in-BSS frames anyway.
397 if (((sc->sc_ah->opmode != NL80211_IFTYPE_AP) &&
398 (sc->rx.rxfilter & FIF_PROMISC_IN_BSS)) ||
399 (sc->sc_ah->opmode == NL80211_IFTYPE_MONITOR))
400 rfilt |= ATH9K_RX_FILTER_PROM;
402 if (sc->rx.rxfilter & FIF_CONTROL)
403 rfilt |= ATH9K_RX_FILTER_CONTROL;
405 if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) &&
406 !(sc->rx.rxfilter & FIF_BCN_PRBRESP_PROMISC))
407 rfilt |= ATH9K_RX_FILTER_MYBEACON;
409 rfilt |= ATH9K_RX_FILTER_BEACON;
411 if ((AR_SREV_9280_10_OR_LATER(sc->sc_ah) ||
412 AR_SREV_9285_10_OR_LATER(sc->sc_ah)) &&
413 (sc->sc_ah->opmode == NL80211_IFTYPE_AP) &&
414 (sc->rx.rxfilter & FIF_PSPOLL))
415 rfilt |= ATH9K_RX_FILTER_PSPOLL;
417 if (conf_is_ht(&sc->hw->conf))
418 rfilt |= ATH9K_RX_FILTER_COMP_BAR;
420 if (sc->sec_wiphy || (sc->rx.rxfilter & FIF_OTHER_BSS)) {
421 /* TODO: only needed if more than one BSSID is in use in
422 * station/adhoc mode */
423 /* The following may also be needed for other older chips */
424 if (sc->sc_ah->hw_version.macVersion == AR_SREV_VERSION_9160)
425 rfilt |= ATH9K_RX_FILTER_PROM;
426 rfilt |= ATH9K_RX_FILTER_MCAST_BCAST_ALL;
431 #undef RX_FILTER_PRESERVE
434 int ath_startrecv(struct ath_softc *sc)
436 struct ath_hw *ah = sc->sc_ah;
437 struct ath_buf *bf, *tbf;
439 spin_lock_bh(&sc->rx.rxbuflock);
440 if (list_empty(&sc->rx.rxbuf))
443 sc->rx.rxlink = NULL;
444 list_for_each_entry_safe(bf, tbf, &sc->rx.rxbuf, list) {
445 ath_rx_buf_link(sc, bf);
448 /* We could have deleted elements so the list may be empty now */
449 if (list_empty(&sc->rx.rxbuf))
452 bf = list_first_entry(&sc->rx.rxbuf, struct ath_buf, list);
453 ath9k_hw_putrxbuf(ah, bf->bf_daddr);
457 spin_unlock_bh(&sc->rx.rxbuflock);
459 ath9k_hw_startpcureceive(ah);
464 bool ath_stoprecv(struct ath_softc *sc)
466 struct ath_hw *ah = sc->sc_ah;
469 ath9k_hw_stoppcurecv(ah);
470 ath9k_hw_setrxfilter(ah, 0);
471 stopped = ath9k_hw_stopdmarecv(ah);
472 sc->rx.rxlink = NULL;
477 void ath_flushrecv(struct ath_softc *sc)
479 spin_lock_bh(&sc->rx.rxflushlock);
480 sc->sc_flags |= SC_OP_RXFLUSH;
481 ath_rx_tasklet(sc, 1);
482 sc->sc_flags &= ~SC_OP_RXFLUSH;
483 spin_unlock_bh(&sc->rx.rxflushlock);
486 static bool ath_beacon_dtim_pending_cab(struct sk_buff *skb)
488 /* Check whether the Beacon frame has DTIM indicating buffered bc/mc */
489 struct ieee80211_mgmt *mgmt;
490 u8 *pos, *end, id, elen;
491 struct ieee80211_tim_ie *tim;
493 mgmt = (struct ieee80211_mgmt *)skb->data;
494 pos = mgmt->u.beacon.variable;
495 end = skb->data + skb->len;
497 while (pos + 2 < end) {
500 if (pos + elen > end)
503 if (id == WLAN_EID_TIM) {
504 if (elen < sizeof(*tim))
506 tim = (struct ieee80211_tim_ie *) pos;
507 if (tim->dtim_count != 0)
509 return tim->bitmap_ctrl & 0x01;
518 static void ath_rx_ps_beacon(struct ath_softc *sc, struct sk_buff *skb)
520 struct ieee80211_mgmt *mgmt;
521 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
523 if (skb->len < 24 + 8 + 2 + 2)
526 mgmt = (struct ieee80211_mgmt *)skb->data;
527 if (memcmp(common->curbssid, mgmt->bssid, ETH_ALEN) != 0)
528 return; /* not from our current AP */
530 sc->sc_flags &= ~SC_OP_WAIT_FOR_BEACON;
532 if (sc->sc_flags & SC_OP_BEACON_SYNC) {
533 sc->sc_flags &= ~SC_OP_BEACON_SYNC;
534 ath_print(common, ATH_DBG_PS,
535 "Reconfigure Beacon timers based on "
536 "timestamp from the AP\n");
537 ath_beacon_config(sc, NULL);
540 if (ath_beacon_dtim_pending_cab(skb)) {
542 * Remain awake waiting for buffered broadcast/multicast
543 * frames. If the last broadcast/multicast frame is not
544 * received properly, the next beacon frame will work as
545 * a backup trigger for returning into NETWORK SLEEP state,
546 * so we are waiting for it as well.
548 ath_print(common, ATH_DBG_PS, "Received DTIM beacon indicating "
549 "buffered broadcast/multicast frame(s)\n");
550 sc->sc_flags |= SC_OP_WAIT_FOR_CAB | SC_OP_WAIT_FOR_BEACON;
554 if (sc->sc_flags & SC_OP_WAIT_FOR_CAB) {
556 * This can happen if a broadcast frame is dropped or the AP
557 * fails to send a frame indicating that all CAB frames have
560 sc->sc_flags &= ~SC_OP_WAIT_FOR_CAB;
561 ath_print(common, ATH_DBG_PS,
562 "PS wait for CAB frames timed out\n");
566 static void ath_rx_ps(struct ath_softc *sc, struct sk_buff *skb)
568 struct ieee80211_hdr *hdr;
569 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
571 hdr = (struct ieee80211_hdr *)skb->data;
573 /* Process Beacon and CAB receive in PS state */
574 if ((sc->sc_flags & SC_OP_WAIT_FOR_BEACON) &&
575 ieee80211_is_beacon(hdr->frame_control))
576 ath_rx_ps_beacon(sc, skb);
577 else if ((sc->sc_flags & SC_OP_WAIT_FOR_CAB) &&
578 (ieee80211_is_data(hdr->frame_control) ||
579 ieee80211_is_action(hdr->frame_control)) &&
580 is_multicast_ether_addr(hdr->addr1) &&
581 !ieee80211_has_moredata(hdr->frame_control)) {
583 * No more broadcast/multicast frames to be received at this
586 sc->sc_flags &= ~SC_OP_WAIT_FOR_CAB;
587 ath_print(common, ATH_DBG_PS,
588 "All PS CAB frames received, back to sleep\n");
589 } else if ((sc->sc_flags & SC_OP_WAIT_FOR_PSPOLL_DATA) &&
590 !is_multicast_ether_addr(hdr->addr1) &&
591 !ieee80211_has_morefrags(hdr->frame_control)) {
592 sc->sc_flags &= ~SC_OP_WAIT_FOR_PSPOLL_DATA;
593 ath_print(common, ATH_DBG_PS,
594 "Going back to sleep after having received "
595 "PS-Poll data (0x%x)\n",
596 sc->sc_flags & (SC_OP_WAIT_FOR_BEACON |
598 SC_OP_WAIT_FOR_PSPOLL_DATA |
599 SC_OP_WAIT_FOR_TX_ACK));
603 static void ath_rx_send_to_mac80211(struct ieee80211_hw *hw,
604 struct ath_softc *sc, struct sk_buff *skb,
605 struct ieee80211_rx_status *rx_status)
607 struct ieee80211_hdr *hdr;
609 hdr = (struct ieee80211_hdr *)skb->data;
611 /* Send the frame to mac80211 */
612 if (is_multicast_ether_addr(hdr->addr1)) {
615 * Deliver broadcast/multicast frames to all suitable
618 /* TODO: filter based on channel configuration */
619 for (i = 0; i < sc->num_sec_wiphy; i++) {
620 struct ath_wiphy *aphy = sc->sec_wiphy[i];
621 struct sk_buff *nskb;
624 nskb = skb_copy(skb, GFP_ATOMIC);
626 memcpy(IEEE80211_SKB_RXCB(nskb), rx_status,
628 ieee80211_rx(aphy->hw, nskb);
631 memcpy(IEEE80211_SKB_RXCB(skb), rx_status, sizeof(*rx_status));
632 ieee80211_rx(sc->hw, skb);
634 /* Deliver unicast frames based on receiver address */
635 memcpy(IEEE80211_SKB_RXCB(skb), rx_status, sizeof(*rx_status));
636 ieee80211_rx(hw, skb);
640 int ath_rx_tasklet(struct ath_softc *sc, int flush)
642 #define PA2DESC(_sc, _pa) \
643 ((struct ath_desc *)((caddr_t)(_sc)->rx.rxdma.dd_desc + \
644 ((_pa) - (_sc)->rx.rxdma.dd_desc_paddr)))
648 struct ath_rx_status *rx_stats;
649 struct sk_buff *skb = NULL, *requeue_skb;
650 struct ieee80211_rx_status rx_status;
651 struct ath_hw *ah = sc->sc_ah;
652 struct ath_common *common = ath9k_hw_common(ah);
654 * The hw can techncically differ from common->hw when using ath9k
655 * virtual wiphy so to account for that we iterate over the active
656 * wiphys and find the appropriate wiphy and therefore hw.
658 struct ieee80211_hw *hw = NULL;
659 struct ieee80211_hdr *hdr;
660 int hdrlen, padsize, retval;
661 bool decrypt_error = false;
665 spin_lock_bh(&sc->rx.rxbuflock);
668 /* If handling rx interrupt and flush is in progress => exit */
669 if ((sc->sc_flags & SC_OP_RXFLUSH) && (flush == 0))
672 if (list_empty(&sc->rx.rxbuf)) {
673 sc->rx.rxlink = NULL;
677 bf = list_first_entry(&sc->rx.rxbuf, struct ath_buf, list);
681 * Must provide the virtual address of the current
682 * descriptor, the physical address, and the virtual
683 * address of the next descriptor in the h/w chain.
684 * This allows the HAL to look ahead to see if the
685 * hardware is done with a descriptor by checking the
686 * done bit in the following descriptor and the address
687 * of the current descriptor the DMA engine is working
688 * on. All this is necessary because of our use of
689 * a self-linked list to avoid rx overruns.
691 retval = ath9k_hw_rxprocdesc(ah, ds,
693 PA2DESC(sc, ds->ds_link),
695 if (retval == -EINPROGRESS) {
697 struct ath_desc *tds;
699 if (list_is_last(&bf->list, &sc->rx.rxbuf)) {
700 sc->rx.rxlink = NULL;
704 tbf = list_entry(bf->list.next, struct ath_buf, list);
707 * On some hardware the descriptor status words could
708 * get corrupted, including the done bit. Because of
709 * this, check if the next descriptor's done bit is
712 * If the next descriptor's done bit is set, the current
713 * descriptor has been corrupted. Force s/w to discard
714 * this descriptor and continue...
718 retval = ath9k_hw_rxprocdesc(ah, tds, tbf->bf_daddr,
719 PA2DESC(sc, tds->ds_link), 0);
720 if (retval == -EINPROGRESS) {
730 * Synchronize the DMA transfer with CPU before
731 * 1. accessing the frame
732 * 2. requeueing the same buffer to h/w
734 dma_sync_single_for_cpu(sc->dev, bf->bf_buf_addr,
738 hdr = (struct ieee80211_hdr *) skb->data;
739 hw = ath_get_virt_hw(sc, hdr);
740 rx_stats = &ds->ds_rxstat;
743 * If we're asked to flush receive queue, directly
744 * chain it back at the queue without processing it.
749 if (!rx_stats->rs_datalen)
752 /* The status portion of the descriptor could get corrupted. */
753 if (sc->rx.bufsize < rx_stats->rs_datalen)
756 if (!ath_rx_prepare(hw, skb, rx_stats,
757 &rx_status, &decrypt_error, sc))
760 /* Ensure we always have an skb to requeue once we are done
761 * processing the current buffer's skb */
762 requeue_skb = ath_rxbuf_alloc(common, sc->rx.bufsize, GFP_ATOMIC);
764 /* If there is no memory we ignore the current RX'd frame,
765 * tell hardware it can give us a new frame using the old
766 * skb and put it at the tail of the sc->rx.rxbuf list for
771 /* Unmap the frame */
772 dma_unmap_single(sc->dev, bf->bf_buf_addr,
776 skb_put(skb, rx_stats->rs_datalen);
778 /* see if any padding is done by the hw and remove it */
779 hdrlen = ieee80211_get_hdrlen_from_skb(skb);
780 fc = hdr->frame_control;
782 /* The MAC header is padded to have 32-bit boundary if the
783 * packet payload is non-zero. The general calculation for
784 * padsize would take into account odd header lengths:
785 * padsize = (4 - hdrlen % 4) % 4; However, since only
786 * even-length headers are used, padding can only be 0 or 2
787 * bytes and we can optimize this a bit. In addition, we must
788 * not try to remove padding from short control frames that do
789 * not have payload. */
790 padsize = hdrlen & 3;
791 if (padsize && hdrlen >= 24) {
792 memmove(skb->data + padsize, skb->data, hdrlen);
793 skb_pull(skb, padsize);
796 keyix = rx_stats->rs_keyix;
798 if (!(keyix == ATH9K_RXKEYIX_INVALID) && !decrypt_error) {
799 rx_status.flag |= RX_FLAG_DECRYPTED;
800 } else if (ieee80211_has_protected(fc)
801 && !decrypt_error && skb->len >= hdrlen + 4) {
802 keyix = skb->data[hdrlen + 3] >> 6;
804 if (test_bit(keyix, sc->keymap))
805 rx_status.flag |= RX_FLAG_DECRYPTED;
807 if (ah->sw_mgmt_crypto &&
808 (rx_status.flag & RX_FLAG_DECRYPTED) &&
809 ieee80211_is_mgmt(fc)) {
810 /* Use software decrypt for management frames. */
811 rx_status.flag &= ~RX_FLAG_DECRYPTED;
814 /* We will now give hardware our shiny new allocated skb */
815 bf->bf_mpdu = requeue_skb;
816 bf->bf_buf_addr = dma_map_single(sc->dev, requeue_skb->data,
819 if (unlikely(dma_mapping_error(sc->dev,
821 dev_kfree_skb_any(requeue_skb);
823 ath_print(common, ATH_DBG_FATAL,
824 "dma_mapping_error() on RX\n");
825 ath_rx_send_to_mac80211(hw, sc, skb, &rx_status);
828 bf->bf_dmacontext = bf->bf_buf_addr;
831 * change the default rx antenna if rx diversity chooses the
832 * other antenna 3 times in a row.
834 if (sc->rx.defant != ds->ds_rxstat.rs_antenna) {
835 if (++sc->rx.rxotherant >= 3)
836 ath_setdefantenna(sc, rx_stats->rs_antenna);
838 sc->rx.rxotherant = 0;
841 if (unlikely(sc->sc_flags & (SC_OP_WAIT_FOR_BEACON |
843 SC_OP_WAIT_FOR_PSPOLL_DATA)))
846 ath_rx_send_to_mac80211(hw, sc, skb, &rx_status);
849 list_move_tail(&bf->list, &sc->rx.rxbuf);
850 ath_rx_buf_link(sc, bf);
853 spin_unlock_bh(&sc->rx.rxbuflock);