2 * Copyright (c) 2008-2011 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.
17 #include <linux/dma-mapping.h>
19 #include "ar9003_mac.h"
21 #define SKB_CB_ATHBUF(__skb) (*((struct ath_rxbuf **)__skb->cb))
23 static inline bool ath9k_check_auto_sleep(struct ath_softc *sc)
25 return sc->ps_enabled &&
26 (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_AUTOSLEEP);
30 * Setup and link descriptors.
32 * 11N: we can no longer afford to self link the last descriptor.
33 * MAC acknowledges BA status as long as it copies frames to host
34 * buffer (or rx fifo). This can incorrectly acknowledge packets
35 * to a sender if last desc is self-linked.
37 static void ath_rx_buf_link(struct ath_softc *sc, struct ath_rxbuf *bf,
40 struct ath_hw *ah = sc->sc_ah;
41 struct ath_common *common = ath9k_hw_common(ah);
46 ds->ds_link = 0; /* link to null */
47 ds->ds_data = bf->bf_buf_addr;
49 /* virtual addr of the beginning of the buffer. */
52 ds->ds_vdata = skb->data;
55 * setup rx descriptors. The rx_bufsize here tells the hardware
56 * how much data it can DMA to us and that we are prepared
59 ath9k_hw_setuprxdesc(ah, ds,
64 *sc->rx.rxlink = bf->bf_daddr;
66 ath9k_hw_putrxbuf(ah, bf->bf_daddr);
68 sc->rx.rxlink = &ds->ds_link;
71 static void ath_rx_buf_relink(struct ath_softc *sc, struct ath_rxbuf *bf,
75 ath_rx_buf_link(sc, sc->rx.buf_hold, flush);
80 static void ath_setdefantenna(struct ath_softc *sc, u32 antenna)
82 /* XXX block beacon interrupts */
83 ath9k_hw_setantenna(sc->sc_ah, antenna);
84 sc->rx.defant = antenna;
85 sc->rx.rxotherant = 0;
88 static void ath_opmode_init(struct ath_softc *sc)
90 struct ath_hw *ah = sc->sc_ah;
91 struct ath_common *common = ath9k_hw_common(ah);
95 /* configure rx filter */
96 rfilt = ath_calcrxfilter(sc);
97 ath9k_hw_setrxfilter(ah, rfilt);
99 /* configure bssid mask */
100 ath_hw_setbssidmask(common);
102 /* configure operational mode */
103 ath9k_hw_setopmode(ah);
105 /* calculate and install multicast filter */
106 mfilt[0] = mfilt[1] = ~0;
107 ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]);
110 static bool ath_rx_edma_buf_link(struct ath_softc *sc,
111 enum ath9k_rx_qtype qtype)
113 struct ath_hw *ah = sc->sc_ah;
114 struct ath_rx_edma *rx_edma;
116 struct ath_rxbuf *bf;
118 rx_edma = &sc->rx.rx_edma[qtype];
119 if (skb_queue_len(&rx_edma->rx_fifo) >= rx_edma->rx_fifo_hwsize)
122 bf = list_first_entry(&sc->rx.rxbuf, struct ath_rxbuf, list);
123 list_del_init(&bf->list);
127 memset(skb->data, 0, ah->caps.rx_status_len);
128 dma_sync_single_for_device(sc->dev, bf->bf_buf_addr,
129 ah->caps.rx_status_len, DMA_TO_DEVICE);
131 SKB_CB_ATHBUF(skb) = bf;
132 ath9k_hw_addrxbuf_edma(ah, bf->bf_buf_addr, qtype);
133 __skb_queue_tail(&rx_edma->rx_fifo, skb);
138 static void ath_rx_addbuffer_edma(struct ath_softc *sc,
139 enum ath9k_rx_qtype qtype)
141 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
142 struct ath_rxbuf *bf, *tbf;
144 if (list_empty(&sc->rx.rxbuf)) {
145 ath_dbg(common, QUEUE, "No free rx buf available\n");
149 list_for_each_entry_safe(bf, tbf, &sc->rx.rxbuf, list)
150 if (!ath_rx_edma_buf_link(sc, qtype))
155 static void ath_rx_remove_buffer(struct ath_softc *sc,
156 enum ath9k_rx_qtype qtype)
158 struct ath_rxbuf *bf;
159 struct ath_rx_edma *rx_edma;
162 rx_edma = &sc->rx.rx_edma[qtype];
164 while ((skb = __skb_dequeue(&rx_edma->rx_fifo)) != NULL) {
165 bf = SKB_CB_ATHBUF(skb);
167 list_add_tail(&bf->list, &sc->rx.rxbuf);
171 static void ath_rx_edma_cleanup(struct ath_softc *sc)
173 struct ath_hw *ah = sc->sc_ah;
174 struct ath_common *common = ath9k_hw_common(ah);
175 struct ath_rxbuf *bf;
177 ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_LP);
178 ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_HP);
180 list_for_each_entry(bf, &sc->rx.rxbuf, list) {
182 dma_unmap_single(sc->dev, bf->bf_buf_addr,
185 dev_kfree_skb_any(bf->bf_mpdu);
192 static void ath_rx_edma_init_queue(struct ath_rx_edma *rx_edma, int size)
194 __skb_queue_head_init(&rx_edma->rx_fifo);
195 rx_edma->rx_fifo_hwsize = size;
198 static int ath_rx_edma_init(struct ath_softc *sc, int nbufs)
200 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
201 struct ath_hw *ah = sc->sc_ah;
203 struct ath_rxbuf *bf;
207 ath9k_hw_set_rx_bufsize(ah, common->rx_bufsize -
208 ah->caps.rx_status_len);
210 ath_rx_edma_init_queue(&sc->rx.rx_edma[ATH9K_RX_QUEUE_LP],
211 ah->caps.rx_lp_qdepth);
212 ath_rx_edma_init_queue(&sc->rx.rx_edma[ATH9K_RX_QUEUE_HP],
213 ah->caps.rx_hp_qdepth);
215 size = sizeof(struct ath_rxbuf) * nbufs;
216 bf = devm_kzalloc(sc->dev, size, GFP_KERNEL);
220 INIT_LIST_HEAD(&sc->rx.rxbuf);
222 for (i = 0; i < nbufs; i++, bf++) {
223 skb = ath_rxbuf_alloc(common, common->rx_bufsize, GFP_KERNEL);
229 memset(skb->data, 0, common->rx_bufsize);
232 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
235 if (unlikely(dma_mapping_error(sc->dev,
237 dev_kfree_skb_any(skb);
241 "dma_mapping_error() on RX init\n");
246 list_add_tail(&bf->list, &sc->rx.rxbuf);
252 ath_rx_edma_cleanup(sc);
256 static void ath_edma_start_recv(struct ath_softc *sc)
258 ath9k_hw_rxena(sc->sc_ah);
259 ath_rx_addbuffer_edma(sc, ATH9K_RX_QUEUE_HP);
260 ath_rx_addbuffer_edma(sc, ATH9K_RX_QUEUE_LP);
262 ath9k_hw_startpcureceive(sc->sc_ah, sc->cur_chan->offchannel);
265 static void ath_edma_stop_recv(struct ath_softc *sc)
267 ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_HP);
268 ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_LP);
271 int ath_rx_init(struct ath_softc *sc, int nbufs)
273 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
275 struct ath_rxbuf *bf;
278 spin_lock_init(&sc->sc_pcu_lock);
280 common->rx_bufsize = IEEE80211_MAX_MPDU_LEN / 2 +
281 sc->sc_ah->caps.rx_status_len;
283 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
284 return ath_rx_edma_init(sc, nbufs);
286 ath_dbg(common, CONFIG, "cachelsz %u rxbufsize %u\n",
287 common->cachelsz, common->rx_bufsize);
289 /* Initialize rx descriptors */
291 error = ath_descdma_setup(sc, &sc->rx.rxdma, &sc->rx.rxbuf,
295 "failed to allocate rx descriptors: %d\n",
300 list_for_each_entry(bf, &sc->rx.rxbuf, list) {
301 skb = ath_rxbuf_alloc(common, common->rx_bufsize,
309 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
312 if (unlikely(dma_mapping_error(sc->dev,
314 dev_kfree_skb_any(skb);
318 "dma_mapping_error() on RX init\n");
323 sc->rx.rxlink = NULL;
331 void ath_rx_cleanup(struct ath_softc *sc)
333 struct ath_hw *ah = sc->sc_ah;
334 struct ath_common *common = ath9k_hw_common(ah);
336 struct ath_rxbuf *bf;
338 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
339 ath_rx_edma_cleanup(sc);
343 list_for_each_entry(bf, &sc->rx.rxbuf, list) {
346 dma_unmap_single(sc->dev, bf->bf_buf_addr,
357 * Calculate the receive filter according to the
358 * operating mode and state:
360 * o always accept unicast, broadcast, and multicast traffic
361 * o maintain current state of phy error reception (the hal
362 * may enable phy error frames for noise immunity work)
363 * o probe request frames are accepted only when operating in
364 * hostap, adhoc, or monitor modes
365 * o enable promiscuous mode according to the interface state
367 * - when operating in adhoc mode so the 802.11 layer creates
368 * node table entries for peers,
369 * - when operating in station mode for collecting rssi data when
370 * the station is otherwise quiet, or
371 * - when operating as a repeater so we see repeater-sta beacons
375 u32 ath_calcrxfilter(struct ath_softc *sc)
377 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
380 if (config_enabled(CONFIG_ATH9K_TX99))
383 rfilt = ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST
384 | ATH9K_RX_FILTER_MCAST;
386 /* if operating on a DFS channel, enable radar pulse detection */
387 if (sc->hw->conf.radar_enabled)
388 rfilt |= ATH9K_RX_FILTER_PHYRADAR | ATH9K_RX_FILTER_PHYERR;
390 spin_lock_bh(&sc->chan_lock);
392 if (sc->cur_chan->rxfilter & FIF_PROBE_REQ)
393 rfilt |= ATH9K_RX_FILTER_PROBEREQ;
396 * Set promiscuous mode when FIF_PROMISC_IN_BSS is enabled for station
397 * mode interface or when in monitor mode. AP mode does not need this
398 * since it receives all in-BSS frames anyway.
400 if (sc->sc_ah->is_monitoring)
401 rfilt |= ATH9K_RX_FILTER_PROM;
403 if ((sc->cur_chan->rxfilter & FIF_CONTROL) ||
404 sc->sc_ah->dynack.enabled)
405 rfilt |= ATH9K_RX_FILTER_CONTROL;
407 if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) &&
408 (sc->cur_chan->nvifs <= 1) &&
409 !(sc->cur_chan->rxfilter & FIF_BCN_PRBRESP_PROMISC))
410 rfilt |= ATH9K_RX_FILTER_MYBEACON;
412 rfilt |= ATH9K_RX_FILTER_BEACON;
414 if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) ||
415 (sc->cur_chan->rxfilter & FIF_PSPOLL))
416 rfilt |= ATH9K_RX_FILTER_PSPOLL;
418 if (sc->cur_chandef.width != NL80211_CHAN_WIDTH_20_NOHT)
419 rfilt |= ATH9K_RX_FILTER_COMP_BAR;
421 if (sc->cur_chan->nvifs > 1 || (sc->cur_chan->rxfilter & FIF_OTHER_BSS)) {
422 /* This is needed for older chips */
423 if (sc->sc_ah->hw_version.macVersion <= AR_SREV_VERSION_9160)
424 rfilt |= ATH9K_RX_FILTER_PROM;
425 rfilt |= ATH9K_RX_FILTER_MCAST_BCAST_ALL;
428 if (AR_SREV_9550(sc->sc_ah) || AR_SREV_9531(sc->sc_ah))
429 rfilt |= ATH9K_RX_FILTER_4ADDRESS;
431 if (ath9k_is_chanctx_enabled() &&
432 test_bit(ATH_OP_SCANNING, &common->op_flags))
433 rfilt |= ATH9K_RX_FILTER_BEACON;
435 spin_unlock_bh(&sc->chan_lock);
441 void ath_startrecv(struct ath_softc *sc)
443 struct ath_hw *ah = sc->sc_ah;
444 struct ath_rxbuf *bf, *tbf;
446 if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
447 ath_edma_start_recv(sc);
451 if (list_empty(&sc->rx.rxbuf))
454 sc->rx.buf_hold = NULL;
455 sc->rx.rxlink = NULL;
456 list_for_each_entry_safe(bf, tbf, &sc->rx.rxbuf, list) {
457 ath_rx_buf_link(sc, bf, false);
460 /* We could have deleted elements so the list may be empty now */
461 if (list_empty(&sc->rx.rxbuf))
464 bf = list_first_entry(&sc->rx.rxbuf, struct ath_rxbuf, list);
465 ath9k_hw_putrxbuf(ah, bf->bf_daddr);
470 ath9k_hw_startpcureceive(ah, sc->cur_chan->offchannel);
473 static void ath_flushrecv(struct ath_softc *sc)
475 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
476 ath_rx_tasklet(sc, 1, true);
477 ath_rx_tasklet(sc, 1, false);
480 bool ath_stoprecv(struct ath_softc *sc)
482 struct ath_hw *ah = sc->sc_ah;
483 bool stopped, reset = false;
485 ath9k_hw_abortpcurecv(ah);
486 ath9k_hw_setrxfilter(ah, 0);
487 stopped = ath9k_hw_stopdmarecv(ah, &reset);
491 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
492 ath_edma_stop_recv(sc);
494 sc->rx.rxlink = NULL;
496 if (!(ah->ah_flags & AH_UNPLUGGED) &&
497 unlikely(!stopped)) {
498 ath_err(ath9k_hw_common(sc->sc_ah),
499 "Could not stop RX, we could be "
500 "confusing the DMA engine when we start RX up\n");
501 ATH_DBG_WARN_ON_ONCE(!stopped);
503 return stopped && !reset;
506 static bool ath_beacon_dtim_pending_cab(struct sk_buff *skb)
508 /* Check whether the Beacon frame has DTIM indicating buffered bc/mc */
509 struct ieee80211_mgmt *mgmt;
510 u8 *pos, *end, id, elen;
511 struct ieee80211_tim_ie *tim;
513 mgmt = (struct ieee80211_mgmt *)skb->data;
514 pos = mgmt->u.beacon.variable;
515 end = skb->data + skb->len;
517 while (pos + 2 < end) {
520 if (pos + elen > end)
523 if (id == WLAN_EID_TIM) {
524 if (elen < sizeof(*tim))
526 tim = (struct ieee80211_tim_ie *) pos;
527 if (tim->dtim_count != 0)
529 return tim->bitmap_ctrl & 0x01;
538 static void ath_rx_ps_beacon(struct ath_softc *sc, struct sk_buff *skb)
540 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
541 bool skip_beacon = false;
543 if (skb->len < 24 + 8 + 2 + 2)
546 sc->ps_flags &= ~PS_WAIT_FOR_BEACON;
548 if (sc->ps_flags & PS_BEACON_SYNC) {
549 sc->ps_flags &= ~PS_BEACON_SYNC;
551 "Reconfigure beacon timers based on synchronized timestamp\n");
553 #ifdef CONFIG_ATH9K_CHANNEL_CONTEXT
554 if (ath9k_is_chanctx_enabled()) {
555 if (sc->cur_chan == &sc->offchannel.chan)
561 !(WARN_ON_ONCE(sc->cur_chan->beacon.beacon_interval == 0)))
562 ath9k_set_beacon(sc);
564 ath9k_p2p_beacon_sync(sc);
567 if (ath_beacon_dtim_pending_cab(skb)) {
569 * Remain awake waiting for buffered broadcast/multicast
570 * frames. If the last broadcast/multicast frame is not
571 * received properly, the next beacon frame will work as
572 * a backup trigger for returning into NETWORK SLEEP state,
573 * so we are waiting for it as well.
576 "Received DTIM beacon indicating buffered broadcast/multicast frame(s)\n");
577 sc->ps_flags |= PS_WAIT_FOR_CAB | PS_WAIT_FOR_BEACON;
581 if (sc->ps_flags & PS_WAIT_FOR_CAB) {
583 * This can happen if a broadcast frame is dropped or the AP
584 * fails to send a frame indicating that all CAB frames have
587 sc->ps_flags &= ~PS_WAIT_FOR_CAB;
588 ath_dbg(common, PS, "PS wait for CAB frames timed out\n");
592 static void ath_rx_ps(struct ath_softc *sc, struct sk_buff *skb, bool mybeacon)
594 struct ieee80211_hdr *hdr;
595 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
597 hdr = (struct ieee80211_hdr *)skb->data;
599 /* Process Beacon and CAB receive in PS state */
600 if (((sc->ps_flags & PS_WAIT_FOR_BEACON) || ath9k_check_auto_sleep(sc))
602 ath_rx_ps_beacon(sc, skb);
603 } else if ((sc->ps_flags & PS_WAIT_FOR_CAB) &&
604 (ieee80211_is_data(hdr->frame_control) ||
605 ieee80211_is_action(hdr->frame_control)) &&
606 is_multicast_ether_addr(hdr->addr1) &&
607 !ieee80211_has_moredata(hdr->frame_control)) {
609 * No more broadcast/multicast frames to be received at this
612 sc->ps_flags &= ~(PS_WAIT_FOR_CAB | PS_WAIT_FOR_BEACON);
614 "All PS CAB frames received, back to sleep\n");
615 } else if ((sc->ps_flags & PS_WAIT_FOR_PSPOLL_DATA) &&
616 !is_multicast_ether_addr(hdr->addr1) &&
617 !ieee80211_has_morefrags(hdr->frame_control)) {
618 sc->ps_flags &= ~PS_WAIT_FOR_PSPOLL_DATA;
620 "Going back to sleep after having received PS-Poll data (0x%lx)\n",
621 sc->ps_flags & (PS_WAIT_FOR_BEACON |
623 PS_WAIT_FOR_PSPOLL_DATA |
624 PS_WAIT_FOR_TX_ACK));
628 static bool ath_edma_get_buffers(struct ath_softc *sc,
629 enum ath9k_rx_qtype qtype,
630 struct ath_rx_status *rs,
631 struct ath_rxbuf **dest)
633 struct ath_rx_edma *rx_edma = &sc->rx.rx_edma[qtype];
634 struct ath_hw *ah = sc->sc_ah;
635 struct ath_common *common = ath9k_hw_common(ah);
637 struct ath_rxbuf *bf;
640 skb = skb_peek(&rx_edma->rx_fifo);
644 bf = SKB_CB_ATHBUF(skb);
647 dma_sync_single_for_cpu(sc->dev, bf->bf_buf_addr,
648 common->rx_bufsize, DMA_FROM_DEVICE);
650 ret = ath9k_hw_process_rxdesc_edma(ah, rs, skb->data);
651 if (ret == -EINPROGRESS) {
652 /*let device gain the buffer again*/
653 dma_sync_single_for_device(sc->dev, bf->bf_buf_addr,
654 common->rx_bufsize, DMA_FROM_DEVICE);
658 __skb_unlink(skb, &rx_edma->rx_fifo);
659 if (ret == -EINVAL) {
660 /* corrupt descriptor, skip this one and the following one */
661 list_add_tail(&bf->list, &sc->rx.rxbuf);
662 ath_rx_edma_buf_link(sc, qtype);
664 skb = skb_peek(&rx_edma->rx_fifo);
666 bf = SKB_CB_ATHBUF(skb);
669 __skb_unlink(skb, &rx_edma->rx_fifo);
670 list_add_tail(&bf->list, &sc->rx.rxbuf);
671 ath_rx_edma_buf_link(sc, qtype);
681 static struct ath_rxbuf *ath_edma_get_next_rx_buf(struct ath_softc *sc,
682 struct ath_rx_status *rs,
683 enum ath9k_rx_qtype qtype)
685 struct ath_rxbuf *bf = NULL;
687 while (ath_edma_get_buffers(sc, qtype, rs, &bf)) {
696 static struct ath_rxbuf *ath_get_next_rx_buf(struct ath_softc *sc,
697 struct ath_rx_status *rs)
699 struct ath_hw *ah = sc->sc_ah;
700 struct ath_common *common = ath9k_hw_common(ah);
702 struct ath_rxbuf *bf;
705 if (list_empty(&sc->rx.rxbuf)) {
706 sc->rx.rxlink = NULL;
710 bf = list_first_entry(&sc->rx.rxbuf, struct ath_rxbuf, list);
711 if (bf == sc->rx.buf_hold)
717 * Must provide the virtual address of the current
718 * descriptor, the physical address, and the virtual
719 * address of the next descriptor in the h/w chain.
720 * This allows the HAL to look ahead to see if the
721 * hardware is done with a descriptor by checking the
722 * done bit in the following descriptor and the address
723 * of the current descriptor the DMA engine is working
724 * on. All this is necessary because of our use of
725 * a self-linked list to avoid rx overruns.
727 ret = ath9k_hw_rxprocdesc(ah, ds, rs);
728 if (ret == -EINPROGRESS) {
729 struct ath_rx_status trs;
730 struct ath_rxbuf *tbf;
731 struct ath_desc *tds;
733 memset(&trs, 0, sizeof(trs));
734 if (list_is_last(&bf->list, &sc->rx.rxbuf)) {
735 sc->rx.rxlink = NULL;
739 tbf = list_entry(bf->list.next, struct ath_rxbuf, list);
742 * On some hardware the descriptor status words could
743 * get corrupted, including the done bit. Because of
744 * this, check if the next descriptor's done bit is
747 * If the next descriptor's done bit is set, the current
748 * descriptor has been corrupted. Force s/w to discard
749 * this descriptor and continue...
753 ret = ath9k_hw_rxprocdesc(ah, tds, &trs);
754 if (ret == -EINPROGRESS)
758 * Re-check previous descriptor, in case it has been filled
761 ret = ath9k_hw_rxprocdesc(ah, ds, rs);
762 if (ret == -EINPROGRESS) {
764 * mark descriptor as zero-length and set the 'more'
765 * flag to ensure that both buffers get discarded
777 * Synchronize the DMA transfer with CPU before
778 * 1. accessing the frame
779 * 2. requeueing the same buffer to h/w
781 dma_sync_single_for_cpu(sc->dev, bf->bf_buf_addr,
788 static void ath9k_process_tsf(struct ath_rx_status *rs,
789 struct ieee80211_rx_status *rxs,
792 u32 tsf_lower = tsf & 0xffffffff;
794 rxs->mactime = (tsf & ~0xffffffffULL) | rs->rs_tstamp;
795 if (rs->rs_tstamp > tsf_lower &&
796 unlikely(rs->rs_tstamp - tsf_lower > 0x10000000))
797 rxs->mactime -= 0x100000000ULL;
799 if (rs->rs_tstamp < tsf_lower &&
800 unlikely(tsf_lower - rs->rs_tstamp > 0x10000000))
801 rxs->mactime += 0x100000000ULL;
805 * For Decrypt or Demic errors, we only mark packet status here and always push
806 * up the frame up to let mac80211 handle the actual error case, be it no
807 * decryption key or real decryption error. This let us keep statistics there.
809 static int ath9k_rx_skb_preprocess(struct ath_softc *sc,
811 struct ath_rx_status *rx_stats,
812 struct ieee80211_rx_status *rx_status,
813 bool *decrypt_error, u64 tsf)
815 struct ieee80211_hw *hw = sc->hw;
816 struct ath_hw *ah = sc->sc_ah;
817 struct ath_common *common = ath9k_hw_common(ah);
818 struct ieee80211_hdr *hdr;
819 bool discard_current = sc->rx.discard_next;
822 * Discard corrupt descriptors which are marked in
823 * ath_get_next_rx_buf().
828 sc->rx.discard_next = false;
831 * Discard zero-length packets.
833 if (!rx_stats->rs_datalen) {
834 RX_STAT_INC(rx_len_err);
839 * rs_status follows rs_datalen so if rs_datalen is too large
840 * we can take a hint that hardware corrupted it, so ignore
843 if (rx_stats->rs_datalen > (common->rx_bufsize - ah->caps.rx_status_len)) {
844 RX_STAT_INC(rx_len_err);
848 /* Only use status info from the last fragment */
849 if (rx_stats->rs_more)
853 * Return immediately if the RX descriptor has been marked
854 * as corrupt based on the various error bits.
856 * This is different from the other corrupt descriptor
857 * condition handled above.
859 if (rx_stats->rs_status & ATH9K_RXERR_CORRUPT_DESC)
862 hdr = (struct ieee80211_hdr *) (skb->data + ah->caps.rx_status_len);
864 ath9k_process_tsf(rx_stats, rx_status, tsf);
865 ath_debug_stat_rx(sc, rx_stats);
868 * Process PHY errors and return so that the packet
871 if (rx_stats->rs_status & ATH9K_RXERR_PHY) {
872 ath9k_dfs_process_phyerr(sc, hdr, rx_stats, rx_status->mactime);
873 if (ath_process_fft(sc, hdr, rx_stats, rx_status->mactime))
874 RX_STAT_INC(rx_spectral);
880 * everything but the rate is checked here, the rate check is done
881 * separately to avoid doing two lookups for a rate for each frame.
883 spin_lock_bh(&sc->chan_lock);
884 if (!ath9k_cmn_rx_accept(common, hdr, rx_status, rx_stats, decrypt_error,
885 sc->cur_chan->rxfilter)) {
886 spin_unlock_bh(&sc->chan_lock);
889 spin_unlock_bh(&sc->chan_lock);
891 if (ath_is_mybeacon(common, hdr)) {
892 RX_STAT_INC(rx_beacons);
893 rx_stats->is_mybeacon = true;
897 * This shouldn't happen, but have a safety check anyway.
899 if (WARN_ON(!ah->curchan))
902 if (ath9k_cmn_process_rate(common, hw, rx_stats, rx_status)) {
904 * No valid hardware bitrate found -- we should not get here
905 * because hardware has already validated this frame as OK.
907 ath_dbg(common, ANY, "unsupported hw bitrate detected 0x%02x using 1 Mbit\n",
909 RX_STAT_INC(rx_rate_err);
913 if (ath9k_is_chanctx_enabled()) {
914 if (rx_stats->is_mybeacon)
915 ath_chanctx_beacon_recv_ev(sc,
916 ATH_CHANCTX_EVENT_BEACON_RECEIVED);
919 ath9k_cmn_process_rssi(common, hw, rx_stats, rx_status);
921 rx_status->band = ah->curchan->chan->band;
922 rx_status->freq = ah->curchan->chan->center_freq;
923 rx_status->antenna = rx_stats->rs_antenna;
924 rx_status->flag |= RX_FLAG_MACTIME_END;
926 #ifdef CONFIG_ATH9K_BTCOEX_SUPPORT
927 if (ieee80211_is_data_present(hdr->frame_control) &&
928 !ieee80211_is_qos_nullfunc(hdr->frame_control))
935 sc->rx.discard_next = rx_stats->rs_more;
940 * Run the LNA combining algorithm only in these cases:
942 * Standalone WLAN cards with both LNA/Antenna diversity
943 * enabled in the EEPROM.
945 * WLAN+BT cards which are in the supported card list
946 * in ath_pci_id_table and the user has loaded the
947 * driver with "bt_ant_diversity" set to true.
949 static void ath9k_antenna_check(struct ath_softc *sc,
950 struct ath_rx_status *rs)
952 struct ath_hw *ah = sc->sc_ah;
953 struct ath9k_hw_capabilities *pCap = &ah->caps;
954 struct ath_common *common = ath9k_hw_common(ah);
956 if (!(ah->caps.hw_caps & ATH9K_HW_CAP_ANT_DIV_COMB))
960 * Change the default rx antenna if rx diversity
961 * chooses the other antenna 3 times in a row.
963 if (sc->rx.defant != rs->rs_antenna) {
964 if (++sc->rx.rxotherant >= 3)
965 ath_setdefantenna(sc, rs->rs_antenna);
967 sc->rx.rxotherant = 0;
970 if (pCap->hw_caps & ATH9K_HW_CAP_BT_ANT_DIV) {
971 if (common->bt_ant_diversity)
972 ath_ant_comb_scan(sc, rs);
974 ath_ant_comb_scan(sc, rs);
978 static void ath9k_apply_ampdu_details(struct ath_softc *sc,
979 struct ath_rx_status *rs, struct ieee80211_rx_status *rxs)
982 rxs->flag |= RX_FLAG_AMPDU_DETAILS | RX_FLAG_AMPDU_LAST_KNOWN;
984 rxs->ampdu_reference = sc->rx.ampdu_ref;
986 if (!rs->rs_moreaggr) {
987 rxs->flag |= RX_FLAG_AMPDU_IS_LAST;
991 if (rs->rs_flags & ATH9K_RX_DELIM_CRC_PRE)
992 rxs->flag |= RX_FLAG_AMPDU_DELIM_CRC_ERROR;
996 int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
998 struct ath_rxbuf *bf;
999 struct sk_buff *skb = NULL, *requeue_skb, *hdr_skb;
1000 struct ieee80211_rx_status *rxs;
1001 struct ath_hw *ah = sc->sc_ah;
1002 struct ath_common *common = ath9k_hw_common(ah);
1003 struct ieee80211_hw *hw = sc->hw;
1005 struct ath_rx_status rs;
1006 enum ath9k_rx_qtype qtype;
1007 bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA);
1010 unsigned long flags;
1011 dma_addr_t new_buf_addr;
1012 unsigned int budget = 512;
1013 struct ieee80211_hdr *hdr;
1016 dma_type = DMA_BIDIRECTIONAL;
1018 dma_type = DMA_FROM_DEVICE;
1020 qtype = hp ? ATH9K_RX_QUEUE_HP : ATH9K_RX_QUEUE_LP;
1022 tsf = ath9k_hw_gettsf64(ah);
1025 bool decrypt_error = false;
1027 memset(&rs, 0, sizeof(rs));
1029 bf = ath_edma_get_next_rx_buf(sc, &rs, qtype);
1031 bf = ath_get_next_rx_buf(sc, &rs);
1041 * Take frame header from the first fragment and RX status from
1045 hdr_skb = sc->rx.frag;
1049 rxs = IEEE80211_SKB_RXCB(hdr_skb);
1050 memset(rxs, 0, sizeof(struct ieee80211_rx_status));
1052 retval = ath9k_rx_skb_preprocess(sc, hdr_skb, &rs, rxs,
1053 &decrypt_error, tsf);
1055 goto requeue_drop_frag;
1057 /* Ensure we always have an skb to requeue once we are done
1058 * processing the current buffer's skb */
1059 requeue_skb = ath_rxbuf_alloc(common, common->rx_bufsize, GFP_ATOMIC);
1061 /* If there is no memory we ignore the current RX'd frame,
1062 * tell hardware it can give us a new frame using the old
1063 * skb and put it at the tail of the sc->rx.rxbuf list for
1066 RX_STAT_INC(rx_oom_err);
1067 goto requeue_drop_frag;
1070 /* We will now give hardware our shiny new allocated skb */
1071 new_buf_addr = dma_map_single(sc->dev, requeue_skb->data,
1072 common->rx_bufsize, dma_type);
1073 if (unlikely(dma_mapping_error(sc->dev, new_buf_addr))) {
1074 dev_kfree_skb_any(requeue_skb);
1075 goto requeue_drop_frag;
1078 /* Unmap the frame */
1079 dma_unmap_single(sc->dev, bf->bf_buf_addr,
1080 common->rx_bufsize, dma_type);
1082 bf->bf_mpdu = requeue_skb;
1083 bf->bf_buf_addr = new_buf_addr;
1085 skb_put(skb, rs.rs_datalen + ah->caps.rx_status_len);
1086 if (ah->caps.rx_status_len)
1087 skb_pull(skb, ah->caps.rx_status_len);
1090 ath9k_cmn_rx_skb_postprocess(common, hdr_skb, &rs,
1091 rxs, decrypt_error);
1094 RX_STAT_INC(rx_frags);
1096 * rs_more indicates chained descriptors which can be
1097 * used to link buffers together for a sort of
1098 * scatter-gather operation.
1101 /* too many fragments - cannot handle frame */
1102 dev_kfree_skb_any(sc->rx.frag);
1103 dev_kfree_skb_any(skb);
1104 RX_STAT_INC(rx_too_many_frags_err);
1112 int space = skb->len - skb_tailroom(hdr_skb);
1114 if (pskb_expand_head(hdr_skb, 0, space, GFP_ATOMIC) < 0) {
1116 RX_STAT_INC(rx_oom_err);
1117 goto requeue_drop_frag;
1122 skb_copy_from_linear_data(skb, skb_put(hdr_skb, skb->len),
1124 dev_kfree_skb_any(skb);
1128 if (rxs->flag & RX_FLAG_MMIC_STRIPPED)
1129 skb_trim(skb, skb->len - 8);
1131 spin_lock_irqsave(&sc->sc_pm_lock, flags);
1132 if ((sc->ps_flags & (PS_WAIT_FOR_BEACON |
1134 PS_WAIT_FOR_PSPOLL_DATA)) ||
1135 ath9k_check_auto_sleep(sc))
1136 ath_rx_ps(sc, skb, rs.is_mybeacon);
1137 spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
1139 ath9k_antenna_check(sc, &rs);
1140 ath9k_apply_ampdu_details(sc, &rs, rxs);
1141 ath_debug_rate_stats(sc, &rs, skb);
1143 hdr = (struct ieee80211_hdr *)skb->data;
1144 if (ieee80211_is_ack(hdr->frame_control))
1145 ath_dynack_sample_ack_ts(sc->sc_ah, skb, rs.rs_tstamp);
1147 ieee80211_rx(hw, skb);
1151 dev_kfree_skb_any(sc->rx.frag);
1155 list_add_tail(&bf->list, &sc->rx.rxbuf);
1158 ath_rx_buf_relink(sc, bf, flush);
1161 } else if (!flush) {
1162 ath_rx_edma_buf_link(sc, qtype);
1169 if (!(ah->imask & ATH9K_INT_RXEOL)) {
1170 ah->imask |= (ATH9K_INT_RXEOL | ATH9K_INT_RXORN);
1171 ath9k_hw_set_interrupts(ah);