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>
18 #include <linux/relay.h>
20 #include "ar9003_mac.h"
22 #define SKB_CB_ATHBUF(__skb) (*((struct ath_buf **)__skb->cb))
24 static inline bool ath9k_check_auto_sleep(struct ath_softc *sc)
26 return sc->ps_enabled &&
27 (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_AUTOSLEEP);
31 * Setup and link descriptors.
33 * 11N: we can no longer afford to self link the last descriptor.
34 * MAC acknowledges BA status as long as it copies frames to host
35 * buffer (or rx fifo). This can incorrectly acknowledge packets
36 * to a sender if last desc is self-linked.
38 static void ath_rx_buf_link(struct ath_softc *sc, struct ath_buf *bf)
40 struct ath_hw *ah = sc->sc_ah;
41 struct ath_common *common = ath9k_hw_common(ah);
48 ds->ds_link = 0; /* link to null */
49 ds->ds_data = bf->bf_buf_addr;
51 /* virtual addr of the beginning of the buffer. */
54 ds->ds_vdata = skb->data;
57 * setup rx descriptors. The rx_bufsize here tells the hardware
58 * how much data it can DMA to us and that we are prepared
61 ath9k_hw_setuprxdesc(ah, ds,
65 if (sc->rx.rxlink == NULL)
66 ath9k_hw_putrxbuf(ah, bf->bf_daddr);
68 *sc->rx.rxlink = bf->bf_daddr;
70 sc->rx.rxlink = &ds->ds_link;
73 static void ath_setdefantenna(struct ath_softc *sc, u32 antenna)
75 /* XXX block beacon interrupts */
76 ath9k_hw_setantenna(sc->sc_ah, antenna);
77 sc->rx.defant = antenna;
78 sc->rx.rxotherant = 0;
81 static void ath_opmode_init(struct ath_softc *sc)
83 struct ath_hw *ah = sc->sc_ah;
84 struct ath_common *common = ath9k_hw_common(ah);
88 /* configure rx filter */
89 rfilt = ath_calcrxfilter(sc);
90 ath9k_hw_setrxfilter(ah, rfilt);
92 /* configure bssid mask */
93 ath_hw_setbssidmask(common);
95 /* configure operational mode */
96 ath9k_hw_setopmode(ah);
98 /* calculate and install multicast filter */
99 mfilt[0] = mfilt[1] = ~0;
100 ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]);
103 static bool ath_rx_edma_buf_link(struct ath_softc *sc,
104 enum ath9k_rx_qtype qtype)
106 struct ath_hw *ah = sc->sc_ah;
107 struct ath_rx_edma *rx_edma;
111 rx_edma = &sc->rx.rx_edma[qtype];
112 if (skb_queue_len(&rx_edma->rx_fifo) >= rx_edma->rx_fifo_hwsize)
115 bf = list_first_entry(&sc->rx.rxbuf, struct ath_buf, list);
116 list_del_init(&bf->list);
121 memset(skb->data, 0, ah->caps.rx_status_len);
122 dma_sync_single_for_device(sc->dev, bf->bf_buf_addr,
123 ah->caps.rx_status_len, DMA_TO_DEVICE);
125 SKB_CB_ATHBUF(skb) = bf;
126 ath9k_hw_addrxbuf_edma(ah, bf->bf_buf_addr, qtype);
127 __skb_queue_tail(&rx_edma->rx_fifo, skb);
132 static void ath_rx_addbuffer_edma(struct ath_softc *sc,
133 enum ath9k_rx_qtype qtype)
135 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
136 struct ath_buf *bf, *tbf;
138 if (list_empty(&sc->rx.rxbuf)) {
139 ath_dbg(common, QUEUE, "No free rx buf available\n");
143 list_for_each_entry_safe(bf, tbf, &sc->rx.rxbuf, list)
144 if (!ath_rx_edma_buf_link(sc, qtype))
149 static void ath_rx_remove_buffer(struct ath_softc *sc,
150 enum ath9k_rx_qtype qtype)
153 struct ath_rx_edma *rx_edma;
156 rx_edma = &sc->rx.rx_edma[qtype];
158 while ((skb = __skb_dequeue(&rx_edma->rx_fifo)) != NULL) {
159 bf = SKB_CB_ATHBUF(skb);
161 list_add_tail(&bf->list, &sc->rx.rxbuf);
165 static void ath_rx_edma_cleanup(struct ath_softc *sc)
167 struct ath_hw *ah = sc->sc_ah;
168 struct ath_common *common = ath9k_hw_common(ah);
171 ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_LP);
172 ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_HP);
174 list_for_each_entry(bf, &sc->rx.rxbuf, list) {
176 dma_unmap_single(sc->dev, bf->bf_buf_addr,
179 dev_kfree_skb_any(bf->bf_mpdu);
186 static void ath_rx_edma_init_queue(struct ath_rx_edma *rx_edma, int size)
188 skb_queue_head_init(&rx_edma->rx_fifo);
189 rx_edma->rx_fifo_hwsize = size;
192 static int ath_rx_edma_init(struct ath_softc *sc, int nbufs)
194 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
195 struct ath_hw *ah = sc->sc_ah;
201 ath9k_hw_set_rx_bufsize(ah, common->rx_bufsize -
202 ah->caps.rx_status_len);
204 ath_rx_edma_init_queue(&sc->rx.rx_edma[ATH9K_RX_QUEUE_LP],
205 ah->caps.rx_lp_qdepth);
206 ath_rx_edma_init_queue(&sc->rx.rx_edma[ATH9K_RX_QUEUE_HP],
207 ah->caps.rx_hp_qdepth);
209 size = sizeof(struct ath_buf) * nbufs;
210 bf = devm_kzalloc(sc->dev, size, GFP_KERNEL);
214 INIT_LIST_HEAD(&sc->rx.rxbuf);
216 for (i = 0; i < nbufs; i++, bf++) {
217 skb = ath_rxbuf_alloc(common, common->rx_bufsize, GFP_KERNEL);
223 memset(skb->data, 0, common->rx_bufsize);
226 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
229 if (unlikely(dma_mapping_error(sc->dev,
231 dev_kfree_skb_any(skb);
235 "dma_mapping_error() on RX init\n");
240 list_add_tail(&bf->list, &sc->rx.rxbuf);
246 ath_rx_edma_cleanup(sc);
250 static void ath_edma_start_recv(struct ath_softc *sc)
252 ath9k_hw_rxena(sc->sc_ah);
253 ath_rx_addbuffer_edma(sc, ATH9K_RX_QUEUE_HP);
254 ath_rx_addbuffer_edma(sc, ATH9K_RX_QUEUE_LP);
256 ath9k_hw_startpcureceive(sc->sc_ah, !!(sc->hw->conf.flags & IEEE80211_CONF_OFFCHANNEL));
259 static void ath_edma_stop_recv(struct ath_softc *sc)
261 ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_HP);
262 ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_LP);
265 int ath_rx_init(struct ath_softc *sc, int nbufs)
267 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
272 spin_lock_init(&sc->sc_pcu_lock);
274 common->rx_bufsize = IEEE80211_MAX_MPDU_LEN / 2 +
275 sc->sc_ah->caps.rx_status_len;
277 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
278 return ath_rx_edma_init(sc, nbufs);
280 ath_dbg(common, CONFIG, "cachelsz %u rxbufsize %u\n",
281 common->cachelsz, common->rx_bufsize);
283 /* Initialize rx descriptors */
285 error = ath_descdma_setup(sc, &sc->rx.rxdma, &sc->rx.rxbuf,
289 "failed to allocate rx descriptors: %d\n",
294 list_for_each_entry(bf, &sc->rx.rxbuf, list) {
295 skb = ath_rxbuf_alloc(common, common->rx_bufsize,
303 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
306 if (unlikely(dma_mapping_error(sc->dev,
308 dev_kfree_skb_any(skb);
312 "dma_mapping_error() on RX init\n");
317 sc->rx.rxlink = NULL;
325 void ath_rx_cleanup(struct ath_softc *sc)
327 struct ath_hw *ah = sc->sc_ah;
328 struct ath_common *common = ath9k_hw_common(ah);
332 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
333 ath_rx_edma_cleanup(sc);
337 list_for_each_entry(bf, &sc->rx.rxbuf, list) {
340 dma_unmap_single(sc->dev, bf->bf_buf_addr,
351 * Calculate the receive filter according to the
352 * operating mode and state:
354 * o always accept unicast, broadcast, and multicast traffic
355 * o maintain current state of phy error reception (the hal
356 * may enable phy error frames for noise immunity work)
357 * o probe request frames are accepted only when operating in
358 * hostap, adhoc, or monitor modes
359 * o enable promiscuous mode according to the interface state
361 * - when operating in adhoc mode so the 802.11 layer creates
362 * node table entries for peers,
363 * - when operating in station mode for collecting rssi data when
364 * the station is otherwise quiet, or
365 * - when operating as a repeater so we see repeater-sta beacons
369 u32 ath_calcrxfilter(struct ath_softc *sc)
373 rfilt = ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST
374 | ATH9K_RX_FILTER_MCAST;
376 /* if operating on a DFS channel, enable radar pulse detection */
377 if (sc->hw->conf.radar_enabled)
378 rfilt |= ATH9K_RX_FILTER_PHYRADAR | ATH9K_RX_FILTER_PHYERR;
380 if (sc->rx.rxfilter & FIF_PROBE_REQ)
381 rfilt |= ATH9K_RX_FILTER_PROBEREQ;
384 * Set promiscuous mode when FIF_PROMISC_IN_BSS is enabled for station
385 * mode interface or when in monitor mode. AP mode does not need this
386 * since it receives all in-BSS frames anyway.
388 if (sc->sc_ah->is_monitoring)
389 rfilt |= ATH9K_RX_FILTER_PROM;
391 if (sc->rx.rxfilter & FIF_CONTROL)
392 rfilt |= ATH9K_RX_FILTER_CONTROL;
394 if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) &&
396 !(sc->rx.rxfilter & FIF_BCN_PRBRESP_PROMISC))
397 rfilt |= ATH9K_RX_FILTER_MYBEACON;
399 rfilt |= ATH9K_RX_FILTER_BEACON;
401 if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) ||
402 (sc->rx.rxfilter & FIF_PSPOLL))
403 rfilt |= ATH9K_RX_FILTER_PSPOLL;
405 if (conf_is_ht(&sc->hw->conf))
406 rfilt |= ATH9K_RX_FILTER_COMP_BAR;
408 if (sc->nvifs > 1 || (sc->rx.rxfilter & FIF_OTHER_BSS)) {
409 /* This is needed for older chips */
410 if (sc->sc_ah->hw_version.macVersion <= AR_SREV_VERSION_9160)
411 rfilt |= ATH9K_RX_FILTER_PROM;
412 rfilt |= ATH9K_RX_FILTER_MCAST_BCAST_ALL;
415 if (AR_SREV_9550(sc->sc_ah))
416 rfilt |= ATH9K_RX_FILTER_4ADDRESS;
422 int ath_startrecv(struct ath_softc *sc)
424 struct ath_hw *ah = sc->sc_ah;
425 struct ath_buf *bf, *tbf;
427 if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
428 ath_edma_start_recv(sc);
432 if (list_empty(&sc->rx.rxbuf))
435 sc->rx.rxlink = NULL;
436 list_for_each_entry_safe(bf, tbf, &sc->rx.rxbuf, list) {
437 ath_rx_buf_link(sc, bf);
440 /* We could have deleted elements so the list may be empty now */
441 if (list_empty(&sc->rx.rxbuf))
444 bf = list_first_entry(&sc->rx.rxbuf, struct ath_buf, list);
445 ath9k_hw_putrxbuf(ah, bf->bf_daddr);
450 ath9k_hw_startpcureceive(ah, !!(sc->hw->conf.flags & IEEE80211_CONF_OFFCHANNEL));
455 static void ath_flushrecv(struct ath_softc *sc)
457 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
458 ath_rx_tasklet(sc, 1, true);
459 ath_rx_tasklet(sc, 1, false);
462 bool ath_stoprecv(struct ath_softc *sc)
464 struct ath_hw *ah = sc->sc_ah;
465 bool stopped, reset = false;
467 ath9k_hw_abortpcurecv(ah);
468 ath9k_hw_setrxfilter(ah, 0);
469 stopped = ath9k_hw_stopdmarecv(ah, &reset);
473 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
474 ath_edma_stop_recv(sc);
476 sc->rx.rxlink = NULL;
478 if (!(ah->ah_flags & AH_UNPLUGGED) &&
479 unlikely(!stopped)) {
480 ath_err(ath9k_hw_common(sc->sc_ah),
481 "Could not stop RX, we could be "
482 "confusing the DMA engine when we start RX up\n");
483 ATH_DBG_WARN_ON_ONCE(!stopped);
485 return stopped && !reset;
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 ath_common *common = ath9k_hw_common(sc->sc_ah);
524 if (skb->len < 24 + 8 + 2 + 2)
527 sc->ps_flags &= ~PS_WAIT_FOR_BEACON;
529 if (sc->ps_flags & PS_BEACON_SYNC) {
530 sc->ps_flags &= ~PS_BEACON_SYNC;
532 "Reconfigure beacon timers based on synchronized timestamp\n");
533 ath9k_set_beacon(sc);
536 if (ath_beacon_dtim_pending_cab(skb)) {
538 * Remain awake waiting for buffered broadcast/multicast
539 * frames. If the last broadcast/multicast frame is not
540 * received properly, the next beacon frame will work as
541 * a backup trigger for returning into NETWORK SLEEP state,
542 * so we are waiting for it as well.
545 "Received DTIM beacon indicating buffered broadcast/multicast frame(s)\n");
546 sc->ps_flags |= PS_WAIT_FOR_CAB | PS_WAIT_FOR_BEACON;
550 if (sc->ps_flags & PS_WAIT_FOR_CAB) {
552 * This can happen if a broadcast frame is dropped or the AP
553 * fails to send a frame indicating that all CAB frames have
556 sc->ps_flags &= ~PS_WAIT_FOR_CAB;
557 ath_dbg(common, PS, "PS wait for CAB frames timed out\n");
561 static void ath_rx_ps(struct ath_softc *sc, struct sk_buff *skb, bool mybeacon)
563 struct ieee80211_hdr *hdr;
564 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
566 hdr = (struct ieee80211_hdr *)skb->data;
568 /* Process Beacon and CAB receive in PS state */
569 if (((sc->ps_flags & PS_WAIT_FOR_BEACON) || ath9k_check_auto_sleep(sc))
571 ath_rx_ps_beacon(sc, skb);
572 } else if ((sc->ps_flags & PS_WAIT_FOR_CAB) &&
573 (ieee80211_is_data(hdr->frame_control) ||
574 ieee80211_is_action(hdr->frame_control)) &&
575 is_multicast_ether_addr(hdr->addr1) &&
576 !ieee80211_has_moredata(hdr->frame_control)) {
578 * No more broadcast/multicast frames to be received at this
581 sc->ps_flags &= ~(PS_WAIT_FOR_CAB | PS_WAIT_FOR_BEACON);
583 "All PS CAB frames received, back to sleep\n");
584 } else if ((sc->ps_flags & PS_WAIT_FOR_PSPOLL_DATA) &&
585 !is_multicast_ether_addr(hdr->addr1) &&
586 !ieee80211_has_morefrags(hdr->frame_control)) {
587 sc->ps_flags &= ~PS_WAIT_FOR_PSPOLL_DATA;
589 "Going back to sleep after having received PS-Poll data (0x%lx)\n",
590 sc->ps_flags & (PS_WAIT_FOR_BEACON |
592 PS_WAIT_FOR_PSPOLL_DATA |
593 PS_WAIT_FOR_TX_ACK));
597 static bool ath_edma_get_buffers(struct ath_softc *sc,
598 enum ath9k_rx_qtype qtype,
599 struct ath_rx_status *rs,
600 struct ath_buf **dest)
602 struct ath_rx_edma *rx_edma = &sc->rx.rx_edma[qtype];
603 struct ath_hw *ah = sc->sc_ah;
604 struct ath_common *common = ath9k_hw_common(ah);
609 skb = skb_peek(&rx_edma->rx_fifo);
613 bf = SKB_CB_ATHBUF(skb);
616 dma_sync_single_for_cpu(sc->dev, bf->bf_buf_addr,
617 common->rx_bufsize, DMA_FROM_DEVICE);
619 ret = ath9k_hw_process_rxdesc_edma(ah, rs, skb->data);
620 if (ret == -EINPROGRESS) {
621 /*let device gain the buffer again*/
622 dma_sync_single_for_device(sc->dev, bf->bf_buf_addr,
623 common->rx_bufsize, DMA_FROM_DEVICE);
627 __skb_unlink(skb, &rx_edma->rx_fifo);
628 if (ret == -EINVAL) {
629 /* corrupt descriptor, skip this one and the following one */
630 list_add_tail(&bf->list, &sc->rx.rxbuf);
631 ath_rx_edma_buf_link(sc, qtype);
633 skb = skb_peek(&rx_edma->rx_fifo);
635 bf = SKB_CB_ATHBUF(skb);
638 __skb_unlink(skb, &rx_edma->rx_fifo);
639 list_add_tail(&bf->list, &sc->rx.rxbuf);
640 ath_rx_edma_buf_link(sc, qtype);
650 static struct ath_buf *ath_edma_get_next_rx_buf(struct ath_softc *sc,
651 struct ath_rx_status *rs,
652 enum ath9k_rx_qtype qtype)
654 struct ath_buf *bf = NULL;
656 while (ath_edma_get_buffers(sc, qtype, rs, &bf)) {
665 static struct ath_buf *ath_get_next_rx_buf(struct ath_softc *sc,
666 struct ath_rx_status *rs)
668 struct ath_hw *ah = sc->sc_ah;
669 struct ath_common *common = ath9k_hw_common(ah);
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 ret = ath9k_hw_rxprocdesc(ah, ds, rs);
694 if (ret == -EINPROGRESS) {
695 struct ath_rx_status trs;
697 struct ath_desc *tds;
699 memset(&trs, 0, sizeof(trs));
700 if (list_is_last(&bf->list, &sc->rx.rxbuf)) {
701 sc->rx.rxlink = NULL;
705 tbf = list_entry(bf->list.next, struct ath_buf, list);
708 * On some hardware the descriptor status words could
709 * get corrupted, including the done bit. Because of
710 * this, check if the next descriptor's done bit is
713 * If the next descriptor's done bit is set, the current
714 * descriptor has been corrupted. Force s/w to discard
715 * this descriptor and continue...
719 ret = ath9k_hw_rxprocdesc(ah, tds, &trs);
720 if (ret == -EINPROGRESS)
724 * mark descriptor as zero-length and set the 'more'
725 * flag to ensure that both buffers get discarded
736 * Synchronize the DMA transfer with CPU before
737 * 1. accessing the frame
738 * 2. requeueing the same buffer to h/w
740 dma_sync_single_for_cpu(sc->dev, bf->bf_buf_addr,
747 /* Assumes you've already done the endian to CPU conversion */
748 static bool ath9k_rx_accept(struct ath_common *common,
749 struct ieee80211_hdr *hdr,
750 struct ieee80211_rx_status *rxs,
751 struct ath_rx_status *rx_stats,
754 struct ath_softc *sc = (struct ath_softc *) common->priv;
755 bool is_mc, is_valid_tkip, strip_mic, mic_error;
756 struct ath_hw *ah = common->ah;
758 u8 rx_status_len = ah->caps.rx_status_len;
760 fc = hdr->frame_control;
762 is_mc = !!is_multicast_ether_addr(hdr->addr1);
763 is_valid_tkip = rx_stats->rs_keyix != ATH9K_RXKEYIX_INVALID &&
764 test_bit(rx_stats->rs_keyix, common->tkip_keymap);
765 strip_mic = is_valid_tkip && ieee80211_is_data(fc) &&
766 ieee80211_has_protected(fc) &&
767 !(rx_stats->rs_status &
768 (ATH9K_RXERR_DECRYPT | ATH9K_RXERR_CRC | ATH9K_RXERR_MIC |
769 ATH9K_RXERR_KEYMISS));
772 * Key miss events are only relevant for pairwise keys where the
773 * descriptor does contain a valid key index. This has been observed
774 * mostly with CCMP encryption.
776 if (rx_stats->rs_keyix == ATH9K_RXKEYIX_INVALID ||
777 !test_bit(rx_stats->rs_keyix, common->ccmp_keymap))
778 rx_stats->rs_status &= ~ATH9K_RXERR_KEYMISS;
780 if (!rx_stats->rs_datalen) {
781 RX_STAT_INC(rx_len_err);
786 * rs_status follows rs_datalen so if rs_datalen is too large
787 * we can take a hint that hardware corrupted it, so ignore
790 if (rx_stats->rs_datalen > (common->rx_bufsize - rx_status_len)) {
791 RX_STAT_INC(rx_len_err);
795 /* Only use error bits from the last fragment */
796 if (rx_stats->rs_more)
799 mic_error = is_valid_tkip && !ieee80211_is_ctl(fc) &&
800 !ieee80211_has_morefrags(fc) &&
801 !(le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG) &&
802 (rx_stats->rs_status & ATH9K_RXERR_MIC);
805 * The rx_stats->rs_status will not be set until the end of the
806 * chained descriptors so it can be ignored if rs_more is set. The
807 * rs_more will be false at the last element of the chained
810 if (rx_stats->rs_status != 0) {
813 if (rx_stats->rs_status & ATH9K_RXERR_CRC) {
814 rxs->flag |= RX_FLAG_FAILED_FCS_CRC;
817 if (rx_stats->rs_status & ATH9K_RXERR_PHY)
820 if ((rx_stats->rs_status & ATH9K_RXERR_DECRYPT) ||
821 (!is_mc && (rx_stats->rs_status & ATH9K_RXERR_KEYMISS))) {
822 *decrypt_error = true;
827 * Reject error frames with the exception of
828 * decryption and MIC failures. For monitor mode,
829 * we also ignore the CRC error.
831 status_mask = ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC |
834 if (ah->is_monitoring && (sc->rx.rxfilter & FIF_FCSFAIL))
835 status_mask |= ATH9K_RXERR_CRC;
837 if (rx_stats->rs_status & ~status_mask)
842 * For unicast frames the MIC error bit can have false positives,
843 * so all MIC error reports need to be validated in software.
844 * False negatives are not common, so skip software verification
845 * if the hardware considers the MIC valid.
848 rxs->flag |= RX_FLAG_MMIC_STRIPPED;
849 else if (is_mc && mic_error)
850 rxs->flag |= RX_FLAG_MMIC_ERROR;
855 static int ath9k_process_rate(struct ath_common *common,
856 struct ieee80211_hw *hw,
857 struct ath_rx_status *rx_stats,
858 struct ieee80211_rx_status *rxs)
860 struct ieee80211_supported_band *sband;
861 enum ieee80211_band band;
863 struct ath_softc __maybe_unused *sc = common->priv;
865 band = hw->conf.chandef.chan->band;
866 sband = hw->wiphy->bands[band];
868 if (rx_stats->rs_rate & 0x80) {
870 rxs->flag |= RX_FLAG_HT;
871 rxs->flag |= rx_stats->flag;
872 rxs->rate_idx = rx_stats->rs_rate & 0x7f;
876 for (i = 0; i < sband->n_bitrates; i++) {
877 if (sband->bitrates[i].hw_value == rx_stats->rs_rate) {
881 if (sband->bitrates[i].hw_value_short == rx_stats->rs_rate) {
882 rxs->flag |= RX_FLAG_SHORTPRE;
889 * No valid hardware bitrate found -- we should not get here
890 * because hardware has already validated this frame as OK.
893 "unsupported hw bitrate detected 0x%02x using 1 Mbit\n",
895 RX_STAT_INC(rx_rate_err);
899 static void ath9k_process_rssi(struct ath_common *common,
900 struct ieee80211_hw *hw,
901 struct ieee80211_hdr *hdr,
902 struct ath_rx_status *rx_stats)
904 struct ath_softc *sc = hw->priv;
905 struct ath_hw *ah = common->ah;
907 int rssi = rx_stats->rs_rssi;
909 if (!rx_stats->is_mybeacon ||
910 ((ah->opmode != NL80211_IFTYPE_STATION) &&
911 (ah->opmode != NL80211_IFTYPE_ADHOC)))
914 if (rx_stats->rs_rssi != ATH9K_RSSI_BAD && !rx_stats->rs_moreaggr)
915 ATH_RSSI_LPF(sc->last_rssi, rx_stats->rs_rssi);
917 last_rssi = sc->last_rssi;
918 if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER))
919 rssi = ATH_EP_RND(last_rssi, ATH_RSSI_EP_MULTIPLIER);
923 /* Update Beacon RSSI, this is used by ANI. */
924 ah->stats.avgbrssi = rssi;
928 * For Decrypt or Demic errors, we only mark packet status here and always push
929 * up the frame up to let mac80211 handle the actual error case, be it no
930 * decryption key or real decryption error. This let us keep statistics there.
932 static int ath9k_rx_skb_preprocess(struct ath_softc *sc,
933 struct ieee80211_hdr *hdr,
934 struct ath_rx_status *rx_stats,
935 struct ieee80211_rx_status *rx_status,
938 struct ieee80211_hw *hw = sc->hw;
939 struct ath_hw *ah = sc->sc_ah;
940 struct ath_common *common = ath9k_hw_common(ah);
941 bool discard_current = sc->rx.discard_next;
943 sc->rx.discard_next = rx_stats->rs_more;
948 * everything but the rate is checked here, the rate check is done
949 * separately to avoid doing two lookups for a rate for each frame.
951 if (!ath9k_rx_accept(common, hdr, rx_status, rx_stats, decrypt_error))
954 /* Only use status info from the last fragment */
955 if (rx_stats->rs_more)
958 if (ath9k_process_rate(common, hw, rx_stats, rx_status))
961 ath9k_process_rssi(common, hw, hdr, rx_stats);
963 rx_status->band = hw->conf.chandef.chan->band;
964 rx_status->freq = hw->conf.chandef.chan->center_freq;
965 rx_status->signal = ah->noise + rx_stats->rs_rssi;
966 rx_status->antenna = rx_stats->rs_antenna;
967 rx_status->flag |= RX_FLAG_MACTIME_END;
968 if (rx_stats->rs_moreaggr)
969 rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL;
971 sc->rx.discard_next = false;
975 static void ath9k_rx_skb_postprocess(struct ath_common *common,
977 struct ath_rx_status *rx_stats,
978 struct ieee80211_rx_status *rxs,
981 struct ath_hw *ah = common->ah;
982 struct ieee80211_hdr *hdr;
983 int hdrlen, padpos, padsize;
987 /* see if any padding is done by the hw and remove it */
988 hdr = (struct ieee80211_hdr *) skb->data;
989 hdrlen = ieee80211_get_hdrlen_from_skb(skb);
990 fc = hdr->frame_control;
991 padpos = ieee80211_hdrlen(fc);
993 /* The MAC header is padded to have 32-bit boundary if the
994 * packet payload is non-zero. The general calculation for
995 * padsize would take into account odd header lengths:
996 * padsize = (4 - padpos % 4) % 4; However, since only
997 * even-length headers are used, padding can only be 0 or 2
998 * bytes and we can optimize this a bit. In addition, we must
999 * not try to remove padding from short control frames that do
1000 * not have payload. */
1001 padsize = padpos & 3;
1002 if (padsize && skb->len>=padpos+padsize+FCS_LEN) {
1003 memmove(skb->data + padsize, skb->data, padpos);
1004 skb_pull(skb, padsize);
1007 keyix = rx_stats->rs_keyix;
1009 if (!(keyix == ATH9K_RXKEYIX_INVALID) && !decrypt_error &&
1010 ieee80211_has_protected(fc)) {
1011 rxs->flag |= RX_FLAG_DECRYPTED;
1012 } else if (ieee80211_has_protected(fc)
1013 && !decrypt_error && skb->len >= hdrlen + 4) {
1014 keyix = skb->data[hdrlen + 3] >> 6;
1016 if (test_bit(keyix, common->keymap))
1017 rxs->flag |= RX_FLAG_DECRYPTED;
1019 if (ah->sw_mgmt_crypto &&
1020 (rxs->flag & RX_FLAG_DECRYPTED) &&
1021 ieee80211_is_mgmt(fc))
1022 /* Use software decrypt for management frames. */
1023 rxs->flag &= ~RX_FLAG_DECRYPTED;
1026 #ifdef CONFIG_ATH9K_DEBUGFS
1027 static s8 fix_rssi_inv_only(u8 rssi_val)
1029 if (rssi_val == 128)
1031 return (s8) rssi_val;
1035 /* returns 1 if this was a spectral frame, even if not handled. */
1036 static int ath_process_fft(struct ath_softc *sc, struct ieee80211_hdr *hdr,
1037 struct ath_rx_status *rs, u64 tsf)
1039 #ifdef CONFIG_ATH9K_DEBUGFS
1040 struct ath_hw *ah = sc->sc_ah;
1041 u8 bins[SPECTRAL_HT20_NUM_BINS];
1042 u8 *vdata = (u8 *)hdr;
1043 struct fft_sample_ht20 fft_sample;
1044 struct ath_radar_info *radar_info;
1045 struct ath_ht20_mag_info *mag_info;
1046 int len = rs->rs_datalen;
1048 u16 length, max_magnitude;
1050 /* AR9280 and before report via ATH9K_PHYERR_RADAR, AR93xx and newer
1051 * via ATH9K_PHYERR_SPECTRAL. Haven't seen ATH9K_PHYERR_FALSE_RADAR_EXT
1052 * yet, but this is supposed to be possible as well.
1054 if (rs->rs_phyerr != ATH9K_PHYERR_RADAR &&
1055 rs->rs_phyerr != ATH9K_PHYERR_FALSE_RADAR_EXT &&
1056 rs->rs_phyerr != ATH9K_PHYERR_SPECTRAL)
1059 /* check if spectral scan bit is set. This does not have to be checked
1060 * if received through a SPECTRAL phy error, but shouldn't hurt.
1062 radar_info = ((struct ath_radar_info *)&vdata[len]) - 1;
1063 if (!(radar_info->pulse_bw_info & SPECTRAL_SCAN_BITMASK))
1066 /* Variation in the data length is possible and will be fixed later.
1067 * Note that we only support HT20 for now.
1069 * TODO: add HT20_40 support as well.
1071 if ((len > SPECTRAL_HT20_TOTAL_DATA_LEN + 2) ||
1072 (len < SPECTRAL_HT20_TOTAL_DATA_LEN - 1))
1075 fft_sample.tlv.type = ATH_FFT_SAMPLE_HT20;
1076 length = sizeof(fft_sample) - sizeof(fft_sample.tlv);
1077 fft_sample.tlv.length = __cpu_to_be16(length);
1079 fft_sample.freq = __cpu_to_be16(ah->curchan->chan->center_freq);
1080 fft_sample.rssi = fix_rssi_inv_only(rs->rs_rssi_ctl0);
1081 fft_sample.noise = ah->noise;
1083 switch (len - SPECTRAL_HT20_TOTAL_DATA_LEN) {
1085 /* length correct, nothing to do. */
1086 memcpy(bins, vdata, SPECTRAL_HT20_NUM_BINS);
1089 /* first byte missing, duplicate it. */
1090 memcpy(&bins[1], vdata, SPECTRAL_HT20_NUM_BINS - 1);
1094 /* MAC added 2 extra bytes at bin 30 and 32, remove them. */
1095 memcpy(bins, vdata, 30);
1096 bins[30] = vdata[31];
1097 memcpy(&bins[31], &vdata[33], SPECTRAL_HT20_NUM_BINS - 31);
1100 /* MAC added 2 extra bytes AND first byte is missing. */
1102 memcpy(&bins[0], vdata, 30);
1103 bins[31] = vdata[31];
1104 memcpy(&bins[32], &vdata[33], SPECTRAL_HT20_NUM_BINS - 32);
1110 /* DC value (value in the middle) is the blind spot of the spectral
1111 * sample and invalid, interpolate it.
1113 dc_pos = SPECTRAL_HT20_NUM_BINS / 2;
1114 bins[dc_pos] = (bins[dc_pos + 1] + bins[dc_pos - 1]) / 2;
1116 /* mag data is at the end of the frame, in front of radar_info */
1117 mag_info = ((struct ath_ht20_mag_info *)radar_info) - 1;
1119 /* copy raw bins without scaling them */
1120 memcpy(fft_sample.data, bins, SPECTRAL_HT20_NUM_BINS);
1121 fft_sample.max_exp = mag_info->max_exp & 0xf;
1123 max_magnitude = spectral_max_magnitude(mag_info->all_bins);
1124 fft_sample.max_magnitude = __cpu_to_be16(max_magnitude);
1125 fft_sample.max_index = spectral_max_index(mag_info->all_bins);
1126 fft_sample.bitmap_weight = spectral_bitmap_weight(mag_info->all_bins);
1127 fft_sample.tsf = __cpu_to_be64(tsf);
1129 ath_debug_send_fft_sample(sc, &fft_sample.tlv);
1136 static void ath9k_apply_ampdu_details(struct ath_softc *sc,
1137 struct ath_rx_status *rs, struct ieee80211_rx_status *rxs)
1139 if (rs->rs_isaggr) {
1140 rxs->flag |= RX_FLAG_AMPDU_DETAILS | RX_FLAG_AMPDU_LAST_KNOWN;
1142 rxs->ampdu_reference = sc->rx.ampdu_ref;
1144 if (!rs->rs_moreaggr) {
1145 rxs->flag |= RX_FLAG_AMPDU_IS_LAST;
1149 if (rs->rs_flags & ATH9K_RX_DELIM_CRC_PRE)
1150 rxs->flag |= RX_FLAG_AMPDU_DELIM_CRC_ERROR;
1154 int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
1157 struct sk_buff *skb = NULL, *requeue_skb, *hdr_skb;
1158 struct ieee80211_rx_status *rxs;
1159 struct ath_hw *ah = sc->sc_ah;
1160 struct ath_common *common = ath9k_hw_common(ah);
1161 struct ieee80211_hw *hw = sc->hw;
1162 struct ieee80211_hdr *hdr;
1164 struct ath_rx_status rs;
1165 enum ath9k_rx_qtype qtype;
1166 bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA);
1168 u8 rx_status_len = ah->caps.rx_status_len;
1171 unsigned long flags;
1172 dma_addr_t new_buf_addr;
1175 dma_type = DMA_BIDIRECTIONAL;
1177 dma_type = DMA_FROM_DEVICE;
1179 qtype = hp ? ATH9K_RX_QUEUE_HP : ATH9K_RX_QUEUE_LP;
1181 tsf = ath9k_hw_gettsf64(ah);
1182 tsf_lower = tsf & 0xffffffff;
1185 bool decrypt_error = false;
1187 memset(&rs, 0, sizeof(rs));
1189 bf = ath_edma_get_next_rx_buf(sc, &rs, qtype);
1191 bf = ath_get_next_rx_buf(sc, &rs);
1201 * Take frame header from the first fragment and RX status from
1205 hdr_skb = sc->rx.frag;
1209 hdr = (struct ieee80211_hdr *) (hdr_skb->data + rx_status_len);
1210 rxs = IEEE80211_SKB_RXCB(hdr_skb);
1211 if (ieee80211_is_beacon(hdr->frame_control)) {
1212 RX_STAT_INC(rx_beacons);
1213 if (!is_zero_ether_addr(common->curbssid) &&
1214 ether_addr_equal(hdr->addr3, common->curbssid))
1215 rs.is_mybeacon = true;
1217 rs.is_mybeacon = false;
1220 rs.is_mybeacon = false;
1222 if (ieee80211_is_data_present(hdr->frame_control) &&
1223 !ieee80211_is_qos_nullfunc(hdr->frame_control))
1226 ath_debug_stat_rx(sc, &rs);
1228 memset(rxs, 0, sizeof(struct ieee80211_rx_status));
1230 rxs->mactime = (tsf & ~0xffffffffULL) | rs.rs_tstamp;
1231 if (rs.rs_tstamp > tsf_lower &&
1232 unlikely(rs.rs_tstamp - tsf_lower > 0x10000000))
1233 rxs->mactime -= 0x100000000ULL;
1235 if (rs.rs_tstamp < tsf_lower &&
1236 unlikely(tsf_lower - rs.rs_tstamp > 0x10000000))
1237 rxs->mactime += 0x100000000ULL;
1239 if (rs.rs_phyerr == ATH9K_PHYERR_RADAR)
1240 ath9k_dfs_process_phyerr(sc, hdr, &rs, rxs->mactime);
1242 if (rs.rs_status & ATH9K_RXERR_PHY) {
1243 if (ath_process_fft(sc, hdr, &rs, rxs->mactime)) {
1244 RX_STAT_INC(rx_spectral);
1245 goto requeue_drop_frag;
1249 retval = ath9k_rx_skb_preprocess(sc, hdr, &rs, rxs,
1252 goto requeue_drop_frag;
1254 if (rs.is_mybeacon) {
1255 sc->hw_busy_count = 0;
1256 ath_start_rx_poll(sc, 3);
1258 /* Ensure we always have an skb to requeue once we are done
1259 * processing the current buffer's skb */
1260 requeue_skb = ath_rxbuf_alloc(common, common->rx_bufsize, GFP_ATOMIC);
1262 /* If there is no memory we ignore the current RX'd frame,
1263 * tell hardware it can give us a new frame using the old
1264 * skb and put it at the tail of the sc->rx.rxbuf list for
1267 RX_STAT_INC(rx_oom_err);
1268 goto requeue_drop_frag;
1271 /* We will now give hardware our shiny new allocated skb */
1272 new_buf_addr = dma_map_single(sc->dev, requeue_skb->data,
1273 common->rx_bufsize, dma_type);
1274 if (unlikely(dma_mapping_error(sc->dev, new_buf_addr))) {
1275 dev_kfree_skb_any(requeue_skb);
1276 goto requeue_drop_frag;
1279 /* Unmap the frame */
1280 dma_unmap_single(sc->dev, bf->bf_buf_addr,
1281 common->rx_bufsize, dma_type);
1283 bf->bf_mpdu = requeue_skb;
1284 bf->bf_buf_addr = new_buf_addr;
1286 skb_put(skb, rs.rs_datalen + ah->caps.rx_status_len);
1287 if (ah->caps.rx_status_len)
1288 skb_pull(skb, ah->caps.rx_status_len);
1291 ath9k_rx_skb_postprocess(common, hdr_skb, &rs,
1292 rxs, decrypt_error);
1295 RX_STAT_INC(rx_frags);
1297 * rs_more indicates chained descriptors which can be
1298 * used to link buffers together for a sort of
1299 * scatter-gather operation.
1302 /* too many fragments - cannot handle frame */
1303 dev_kfree_skb_any(sc->rx.frag);
1304 dev_kfree_skb_any(skb);
1305 RX_STAT_INC(rx_too_many_frags_err);
1311 if (rs.rs_status & ATH9K_RXERR_CORRUPT_DESC)
1312 goto requeue_drop_frag;
1315 int space = skb->len - skb_tailroom(hdr_skb);
1317 if (pskb_expand_head(hdr_skb, 0, space, GFP_ATOMIC) < 0) {
1319 RX_STAT_INC(rx_oom_err);
1320 goto requeue_drop_frag;
1325 skb_copy_from_linear_data(skb, skb_put(hdr_skb, skb->len),
1327 dev_kfree_skb_any(skb);
1332 if (ah->caps.hw_caps & ATH9K_HW_CAP_ANT_DIV_COMB) {
1335 * change the default rx antenna if rx diversity
1336 * chooses the other antenna 3 times in a row.
1338 if (sc->rx.defant != rs.rs_antenna) {
1339 if (++sc->rx.rxotherant >= 3)
1340 ath_setdefantenna(sc, rs.rs_antenna);
1342 sc->rx.rxotherant = 0;
1347 if (rxs->flag & RX_FLAG_MMIC_STRIPPED)
1348 skb_trim(skb, skb->len - 8);
1350 spin_lock_irqsave(&sc->sc_pm_lock, flags);
1351 if ((sc->ps_flags & (PS_WAIT_FOR_BEACON |
1353 PS_WAIT_FOR_PSPOLL_DATA)) ||
1354 ath9k_check_auto_sleep(sc))
1355 ath_rx_ps(sc, skb, rs.is_mybeacon);
1356 spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
1358 if ((ah->caps.hw_caps & ATH9K_HW_CAP_ANT_DIV_COMB) && sc->ant_rx == 3)
1359 ath_ant_comb_scan(sc, &rs);
1361 ath9k_apply_ampdu_details(sc, &rs, rxs);
1363 ieee80211_rx(hw, skb);
1367 dev_kfree_skb_any(sc->rx.frag);
1371 list_add_tail(&bf->list, &sc->rx.rxbuf);
1376 ath_rx_edma_buf_link(sc, qtype);
1378 ath_rx_buf_link(sc, bf);
1383 if (!(ah->imask & ATH9K_INT_RXEOL)) {
1384 ah->imask |= (ATH9K_INT_RXEOL | ATH9K_INT_RXORN);
1385 ath9k_hw_set_interrupts(ah);