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, int size)
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);
254 ath_rx_addbuffer_edma(sc, ATH9K_RX_QUEUE_HP,
255 sc->rx.rx_edma[ATH9K_RX_QUEUE_HP].rx_fifo_hwsize);
257 ath_rx_addbuffer_edma(sc, ATH9K_RX_QUEUE_LP,
258 sc->rx.rx_edma[ATH9K_RX_QUEUE_LP].rx_fifo_hwsize);
262 ath9k_hw_startpcureceive(sc->sc_ah, !!(sc->hw->conf.flags & IEEE80211_CONF_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);
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;
333 void ath_rx_cleanup(struct ath_softc *sc)
335 struct ath_hw *ah = sc->sc_ah;
336 struct ath_common *common = ath9k_hw_common(ah);
340 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
341 ath_rx_edma_cleanup(sc);
344 list_for_each_entry(bf, &sc->rx.rxbuf, list) {
347 dma_unmap_single(sc->dev, bf->bf_buf_addr,
359 * Calculate the receive filter according to the
360 * operating mode and state:
362 * o always accept unicast, broadcast, and multicast traffic
363 * o maintain current state of phy error reception (the hal
364 * may enable phy error frames for noise immunity work)
365 * o probe request frames are accepted only when operating in
366 * hostap, adhoc, or monitor modes
367 * o enable promiscuous mode according to the interface state
369 * - when operating in adhoc mode so the 802.11 layer creates
370 * node table entries for peers,
371 * - when operating in station mode for collecting rssi data when
372 * the station is otherwise quiet, or
373 * - when operating as a repeater so we see repeater-sta beacons
377 u32 ath_calcrxfilter(struct ath_softc *sc)
381 rfilt = ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST
382 | ATH9K_RX_FILTER_MCAST;
384 /* if operating on a DFS channel, enable radar pulse detection */
385 if (sc->hw->conf.radar_enabled)
386 rfilt |= ATH9K_RX_FILTER_PHYRADAR | ATH9K_RX_FILTER_PHYERR;
388 if (sc->rx.rxfilter & FIF_PROBE_REQ)
389 rfilt |= ATH9K_RX_FILTER_PROBEREQ;
392 * Set promiscuous mode when FIF_PROMISC_IN_BSS is enabled for station
393 * mode interface or when in monitor mode. AP mode does not need this
394 * since it receives all in-BSS frames anyway.
396 if (sc->sc_ah->is_monitoring)
397 rfilt |= ATH9K_RX_FILTER_PROM;
399 if (sc->rx.rxfilter & FIF_CONTROL)
400 rfilt |= ATH9K_RX_FILTER_CONTROL;
402 if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) &&
404 !(sc->rx.rxfilter & FIF_BCN_PRBRESP_PROMISC))
405 rfilt |= ATH9K_RX_FILTER_MYBEACON;
407 rfilt |= ATH9K_RX_FILTER_BEACON;
409 if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) ||
410 (sc->rx.rxfilter & FIF_PSPOLL))
411 rfilt |= ATH9K_RX_FILTER_PSPOLL;
413 if (conf_is_ht(&sc->hw->conf))
414 rfilt |= ATH9K_RX_FILTER_COMP_BAR;
416 if (sc->nvifs > 1 || (sc->rx.rxfilter & FIF_OTHER_BSS)) {
417 /* This is needed for older chips */
418 if (sc->sc_ah->hw_version.macVersion <= AR_SREV_VERSION_9160)
419 rfilt |= ATH9K_RX_FILTER_PROM;
420 rfilt |= ATH9K_RX_FILTER_MCAST_BCAST_ALL;
423 if (AR_SREV_9550(sc->sc_ah))
424 rfilt |= ATH9K_RX_FILTER_4ADDRESS;
430 int ath_startrecv(struct ath_softc *sc)
432 struct ath_hw *ah = sc->sc_ah;
433 struct ath_buf *bf, *tbf;
435 if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
436 ath_edma_start_recv(sc);
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);
458 ath9k_hw_startpcureceive(ah, !!(sc->hw->conf.flags & IEEE80211_CONF_OFFCHANNEL));
463 static void ath_flushrecv(struct ath_softc *sc)
465 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
466 ath_rx_tasklet(sc, 1, true);
467 ath_rx_tasklet(sc, 1, false);
470 bool ath_stoprecv(struct ath_softc *sc)
472 struct ath_hw *ah = sc->sc_ah;
473 bool stopped, reset = false;
475 ath9k_hw_abortpcurecv(ah);
476 ath9k_hw_setrxfilter(ah, 0);
477 stopped = ath9k_hw_stopdmarecv(ah, &reset);
481 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
482 ath_edma_stop_recv(sc);
484 sc->rx.rxlink = NULL;
486 if (!(ah->ah_flags & AH_UNPLUGGED) &&
487 unlikely(!stopped)) {
488 ath_err(ath9k_hw_common(sc->sc_ah),
489 "Could not stop RX, we could be "
490 "confusing the DMA engine when we start RX up\n");
491 ATH_DBG_WARN_ON_ONCE(!stopped);
493 return stopped && !reset;
496 static bool ath_beacon_dtim_pending_cab(struct sk_buff *skb)
498 /* Check whether the Beacon frame has DTIM indicating buffered bc/mc */
499 struct ieee80211_mgmt *mgmt;
500 u8 *pos, *end, id, elen;
501 struct ieee80211_tim_ie *tim;
503 mgmt = (struct ieee80211_mgmt *)skb->data;
504 pos = mgmt->u.beacon.variable;
505 end = skb->data + skb->len;
507 while (pos + 2 < end) {
510 if (pos + elen > end)
513 if (id == WLAN_EID_TIM) {
514 if (elen < sizeof(*tim))
516 tim = (struct ieee80211_tim_ie *) pos;
517 if (tim->dtim_count != 0)
519 return tim->bitmap_ctrl & 0x01;
528 static void ath_rx_ps_beacon(struct ath_softc *sc, struct sk_buff *skb)
530 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
532 if (skb->len < 24 + 8 + 2 + 2)
535 sc->ps_flags &= ~PS_WAIT_FOR_BEACON;
537 if (sc->ps_flags & PS_BEACON_SYNC) {
538 sc->ps_flags &= ~PS_BEACON_SYNC;
540 "Reconfigure beacon timers based on synchronized timestamp\n");
541 ath9k_set_beacon(sc);
544 if (ath_beacon_dtim_pending_cab(skb)) {
546 * Remain awake waiting for buffered broadcast/multicast
547 * frames. If the last broadcast/multicast frame is not
548 * received properly, the next beacon frame will work as
549 * a backup trigger for returning into NETWORK SLEEP state,
550 * so we are waiting for it as well.
553 "Received DTIM beacon indicating buffered broadcast/multicast frame(s)\n");
554 sc->ps_flags |= PS_WAIT_FOR_CAB | PS_WAIT_FOR_BEACON;
558 if (sc->ps_flags & PS_WAIT_FOR_CAB) {
560 * This can happen if a broadcast frame is dropped or the AP
561 * fails to send a frame indicating that all CAB frames have
564 sc->ps_flags &= ~PS_WAIT_FOR_CAB;
565 ath_dbg(common, PS, "PS wait for CAB frames timed out\n");
569 static void ath_rx_ps(struct ath_softc *sc, struct sk_buff *skb, bool mybeacon)
571 struct ieee80211_hdr *hdr;
572 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
574 hdr = (struct ieee80211_hdr *)skb->data;
576 /* Process Beacon and CAB receive in PS state */
577 if (((sc->ps_flags & PS_WAIT_FOR_BEACON) || ath9k_check_auto_sleep(sc))
579 ath_rx_ps_beacon(sc, skb);
580 } else if ((sc->ps_flags & PS_WAIT_FOR_CAB) &&
581 (ieee80211_is_data(hdr->frame_control) ||
582 ieee80211_is_action(hdr->frame_control)) &&
583 is_multicast_ether_addr(hdr->addr1) &&
584 !ieee80211_has_moredata(hdr->frame_control)) {
586 * No more broadcast/multicast frames to be received at this
589 sc->ps_flags &= ~(PS_WAIT_FOR_CAB | PS_WAIT_FOR_BEACON);
591 "All PS CAB frames received, back to sleep\n");
592 } else if ((sc->ps_flags & PS_WAIT_FOR_PSPOLL_DATA) &&
593 !is_multicast_ether_addr(hdr->addr1) &&
594 !ieee80211_has_morefrags(hdr->frame_control)) {
595 sc->ps_flags &= ~PS_WAIT_FOR_PSPOLL_DATA;
597 "Going back to sleep after having received PS-Poll data (0x%lx)\n",
598 sc->ps_flags & (PS_WAIT_FOR_BEACON |
600 PS_WAIT_FOR_PSPOLL_DATA |
601 PS_WAIT_FOR_TX_ACK));
605 static bool ath_edma_get_buffers(struct ath_softc *sc,
606 enum ath9k_rx_qtype qtype,
607 struct ath_rx_status *rs,
608 struct ath_buf **dest)
610 struct ath_rx_edma *rx_edma = &sc->rx.rx_edma[qtype];
611 struct ath_hw *ah = sc->sc_ah;
612 struct ath_common *common = ath9k_hw_common(ah);
617 skb = skb_peek(&rx_edma->rx_fifo);
621 bf = SKB_CB_ATHBUF(skb);
624 dma_sync_single_for_cpu(sc->dev, bf->bf_buf_addr,
625 common->rx_bufsize, DMA_FROM_DEVICE);
627 ret = ath9k_hw_process_rxdesc_edma(ah, rs, skb->data);
628 if (ret == -EINPROGRESS) {
629 /*let device gain the buffer again*/
630 dma_sync_single_for_device(sc->dev, bf->bf_buf_addr,
631 common->rx_bufsize, DMA_FROM_DEVICE);
635 __skb_unlink(skb, &rx_edma->rx_fifo);
636 if (ret == -EINVAL) {
637 /* corrupt descriptor, skip this one and the following one */
638 list_add_tail(&bf->list, &sc->rx.rxbuf);
639 ath_rx_edma_buf_link(sc, qtype);
641 skb = skb_peek(&rx_edma->rx_fifo);
643 bf = SKB_CB_ATHBUF(skb);
646 __skb_unlink(skb, &rx_edma->rx_fifo);
647 list_add_tail(&bf->list, &sc->rx.rxbuf);
648 ath_rx_edma_buf_link(sc, qtype);
658 static struct ath_buf *ath_edma_get_next_rx_buf(struct ath_softc *sc,
659 struct ath_rx_status *rs,
660 enum ath9k_rx_qtype qtype)
662 struct ath_buf *bf = NULL;
664 while (ath_edma_get_buffers(sc, qtype, rs, &bf)) {
673 static struct ath_buf *ath_get_next_rx_buf(struct ath_softc *sc,
674 struct ath_rx_status *rs)
676 struct ath_hw *ah = sc->sc_ah;
677 struct ath_common *common = ath9k_hw_common(ah);
682 if (list_empty(&sc->rx.rxbuf)) {
683 sc->rx.rxlink = NULL;
687 bf = list_first_entry(&sc->rx.rxbuf, struct ath_buf, list);
691 * Must provide the virtual address of the current
692 * descriptor, the physical address, and the virtual
693 * address of the next descriptor in the h/w chain.
694 * This allows the HAL to look ahead to see if the
695 * hardware is done with a descriptor by checking the
696 * done bit in the following descriptor and the address
697 * of the current descriptor the DMA engine is working
698 * on. All this is necessary because of our use of
699 * a self-linked list to avoid rx overruns.
701 ret = ath9k_hw_rxprocdesc(ah, ds, rs);
702 if (ret == -EINPROGRESS) {
703 struct ath_rx_status trs;
705 struct ath_desc *tds;
707 memset(&trs, 0, sizeof(trs));
708 if (list_is_last(&bf->list, &sc->rx.rxbuf)) {
709 sc->rx.rxlink = NULL;
713 tbf = list_entry(bf->list.next, struct ath_buf, list);
716 * On some hardware the descriptor status words could
717 * get corrupted, including the done bit. Because of
718 * this, check if the next descriptor's done bit is
721 * If the next descriptor's done bit is set, the current
722 * descriptor has been corrupted. Force s/w to discard
723 * this descriptor and continue...
727 ret = ath9k_hw_rxprocdesc(ah, tds, &trs);
728 if (ret == -EINPROGRESS)
737 * Synchronize the DMA transfer with CPU before
738 * 1. accessing the frame
739 * 2. requeueing the same buffer to h/w
741 dma_sync_single_for_cpu(sc->dev, bf->bf_buf_addr,
748 /* Assumes you've already done the endian to CPU conversion */
749 static bool ath9k_rx_accept(struct ath_common *common,
750 struct ieee80211_hdr *hdr,
751 struct ieee80211_rx_status *rxs,
752 struct ath_rx_status *rx_stats,
755 struct ath_softc *sc = (struct ath_softc *) common->priv;
756 bool is_mc, is_valid_tkip, strip_mic, mic_error;
757 struct ath_hw *ah = common->ah;
759 u8 rx_status_len = ah->caps.rx_status_len;
761 fc = hdr->frame_control;
763 is_mc = !!is_multicast_ether_addr(hdr->addr1);
764 is_valid_tkip = rx_stats->rs_keyix != ATH9K_RXKEYIX_INVALID &&
765 test_bit(rx_stats->rs_keyix, common->tkip_keymap);
766 strip_mic = is_valid_tkip && ieee80211_is_data(fc) &&
767 ieee80211_has_protected(fc) &&
768 !(rx_stats->rs_status &
769 (ATH9K_RXERR_DECRYPT | ATH9K_RXERR_CRC | ATH9K_RXERR_MIC |
770 ATH9K_RXERR_KEYMISS));
773 * Key miss events are only relevant for pairwise keys where the
774 * descriptor does contain a valid key index. This has been observed
775 * mostly with CCMP encryption.
777 if (rx_stats->rs_keyix == ATH9K_RXKEYIX_INVALID ||
778 !test_bit(rx_stats->rs_keyix, common->ccmp_keymap))
779 rx_stats->rs_status &= ~ATH9K_RXERR_KEYMISS;
781 if (!rx_stats->rs_datalen) {
782 RX_STAT_INC(rx_len_err);
787 * rs_status follows rs_datalen so if rs_datalen is too large
788 * we can take a hint that hardware corrupted it, so ignore
791 if (rx_stats->rs_datalen > (common->rx_bufsize - rx_status_len)) {
792 RX_STAT_INC(rx_len_err);
796 /* Only use error bits from the last fragment */
797 if (rx_stats->rs_more)
800 mic_error = is_valid_tkip && !ieee80211_is_ctl(fc) &&
801 !ieee80211_has_morefrags(fc) &&
802 !(le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG) &&
803 (rx_stats->rs_status & ATH9K_RXERR_MIC);
806 * The rx_stats->rs_status will not be set until the end of the
807 * chained descriptors so it can be ignored if rs_more is set. The
808 * rs_more will be false at the last element of the chained
811 if (rx_stats->rs_status != 0) {
814 if (rx_stats->rs_status & ATH9K_RXERR_CRC) {
815 rxs->flag |= RX_FLAG_FAILED_FCS_CRC;
818 if (rx_stats->rs_status & ATH9K_RXERR_PHY)
821 if ((rx_stats->rs_status & ATH9K_RXERR_DECRYPT) ||
822 (!is_mc && (rx_stats->rs_status & ATH9K_RXERR_KEYMISS))) {
823 *decrypt_error = true;
828 * Reject error frames with the exception of
829 * decryption and MIC failures. For monitor mode,
830 * we also ignore the CRC error.
832 status_mask = ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC |
835 if (ah->is_monitoring && (sc->rx.rxfilter & FIF_FCSFAIL))
836 status_mask |= ATH9K_RXERR_CRC;
838 if (rx_stats->rs_status & ~status_mask)
843 * For unicast frames the MIC error bit can have false positives,
844 * so all MIC error reports need to be validated in software.
845 * False negatives are not common, so skip software verification
846 * if the hardware considers the MIC valid.
849 rxs->flag |= RX_FLAG_MMIC_STRIPPED;
850 else if (is_mc && mic_error)
851 rxs->flag |= RX_FLAG_MMIC_ERROR;
856 static int ath9k_process_rate(struct ath_common *common,
857 struct ieee80211_hw *hw,
858 struct ath_rx_status *rx_stats,
859 struct ieee80211_rx_status *rxs)
861 struct ieee80211_supported_band *sband;
862 enum ieee80211_band band;
864 struct ath_softc __maybe_unused *sc = common->priv;
866 band = hw->conf.channel->band;
867 sband = hw->wiphy->bands[band];
869 if (rx_stats->rs_rate & 0x80) {
871 rxs->flag |= RX_FLAG_HT;
872 if (rx_stats->rs_flags & ATH9K_RX_2040)
873 rxs->flag |= RX_FLAG_40MHZ;
874 if (rx_stats->rs_flags & ATH9K_RX_GI)
875 rxs->flag |= RX_FLAG_SHORT_GI;
876 rxs->rate_idx = rx_stats->rs_rate & 0x7f;
880 for (i = 0; i < sband->n_bitrates; i++) {
881 if (sband->bitrates[i].hw_value == rx_stats->rs_rate) {
885 if (sband->bitrates[i].hw_value_short == rx_stats->rs_rate) {
886 rxs->flag |= RX_FLAG_SHORTPRE;
893 * No valid hardware bitrate found -- we should not get here
894 * because hardware has already validated this frame as OK.
897 "unsupported hw bitrate detected 0x%02x using 1 Mbit\n",
899 RX_STAT_INC(rx_rate_err);
903 static void ath9k_process_rssi(struct ath_common *common,
904 struct ieee80211_hw *hw,
905 struct ieee80211_hdr *hdr,
906 struct ath_rx_status *rx_stats)
908 struct ath_softc *sc = hw->priv;
909 struct ath_hw *ah = common->ah;
911 int rssi = rx_stats->rs_rssi;
913 if (!rx_stats->is_mybeacon ||
914 ((ah->opmode != NL80211_IFTYPE_STATION) &&
915 (ah->opmode != NL80211_IFTYPE_ADHOC)))
918 if (rx_stats->rs_rssi != ATH9K_RSSI_BAD && !rx_stats->rs_moreaggr)
919 ATH_RSSI_LPF(sc->last_rssi, rx_stats->rs_rssi);
921 last_rssi = sc->last_rssi;
922 if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER))
923 rssi = ATH_EP_RND(last_rssi, ATH_RSSI_EP_MULTIPLIER);
927 /* Update Beacon RSSI, this is used by ANI. */
928 ah->stats.avgbrssi = rssi;
932 * For Decrypt or Demic errors, we only mark packet status here and always push
933 * up the frame up to let mac80211 handle the actual error case, be it no
934 * decryption key or real decryption error. This let us keep statistics there.
936 static int ath9k_rx_skb_preprocess(struct ath_common *common,
937 struct ieee80211_hw *hw,
938 struct ieee80211_hdr *hdr,
939 struct ath_rx_status *rx_stats,
940 struct ieee80211_rx_status *rx_status,
943 struct ath_hw *ah = common->ah;
946 * everything but the rate is checked here, the rate check is done
947 * separately to avoid doing two lookups for a rate for each frame.
949 if (!ath9k_rx_accept(common, hdr, rx_status, rx_stats, decrypt_error))
952 /* Only use status info from the last fragment */
953 if (rx_stats->rs_more)
956 ath9k_process_rssi(common, hw, hdr, rx_stats);
958 if (ath9k_process_rate(common, hw, rx_stats, rx_status))
961 rx_status->band = hw->conf.channel->band;
962 rx_status->freq = hw->conf.channel->center_freq;
963 rx_status->signal = ah->noise + rx_stats->rs_rssi;
964 rx_status->antenna = rx_stats->rs_antenna;
965 rx_status->flag |= RX_FLAG_MACTIME_END;
966 if (rx_stats->rs_moreaggr)
967 rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL;
972 static void ath9k_rx_skb_postprocess(struct ath_common *common,
974 struct ath_rx_status *rx_stats,
975 struct ieee80211_rx_status *rxs,
978 struct ath_hw *ah = common->ah;
979 struct ieee80211_hdr *hdr;
980 int hdrlen, padpos, padsize;
984 /* see if any padding is done by the hw and remove it */
985 hdr = (struct ieee80211_hdr *) skb->data;
986 hdrlen = ieee80211_get_hdrlen_from_skb(skb);
987 fc = hdr->frame_control;
988 padpos = ath9k_cmn_padpos(hdr->frame_control);
990 /* The MAC header is padded to have 32-bit boundary if the
991 * packet payload is non-zero. The general calculation for
992 * padsize would take into account odd header lengths:
993 * padsize = (4 - padpos % 4) % 4; However, since only
994 * even-length headers are used, padding can only be 0 or 2
995 * bytes and we can optimize this a bit. In addition, we must
996 * not try to remove padding from short control frames that do
997 * not have payload. */
998 padsize = padpos & 3;
999 if (padsize && skb->len>=padpos+padsize+FCS_LEN) {
1000 memmove(skb->data + padsize, skb->data, padpos);
1001 skb_pull(skb, padsize);
1004 keyix = rx_stats->rs_keyix;
1006 if (!(keyix == ATH9K_RXKEYIX_INVALID) && !decrypt_error &&
1007 ieee80211_has_protected(fc)) {
1008 rxs->flag |= RX_FLAG_DECRYPTED;
1009 } else if (ieee80211_has_protected(fc)
1010 && !decrypt_error && skb->len >= hdrlen + 4) {
1011 keyix = skb->data[hdrlen + 3] >> 6;
1013 if (test_bit(keyix, common->keymap))
1014 rxs->flag |= RX_FLAG_DECRYPTED;
1016 if (ah->sw_mgmt_crypto &&
1017 (rxs->flag & RX_FLAG_DECRYPTED) &&
1018 ieee80211_is_mgmt(fc))
1019 /* Use software decrypt for management frames. */
1020 rxs->flag &= ~RX_FLAG_DECRYPTED;
1023 #ifdef CONFIG_ATH9K_DEBUGFS
1024 static s8 fix_rssi_inv_only(u8 rssi_val)
1026 if (rssi_val == 128)
1028 return (s8) rssi_val;
1032 /* returns 1 if this was a spectral frame, even if not handled. */
1033 static int ath_process_fft(struct ath_softc *sc, struct ieee80211_hdr *hdr,
1034 struct ath_rx_status *rs, u64 tsf)
1036 #ifdef CONFIG_ATH9K_DEBUGFS
1037 struct ath_hw *ah = sc->sc_ah;
1038 u8 bins[SPECTRAL_HT20_NUM_BINS];
1039 u8 *vdata = (u8 *)hdr;
1040 struct fft_sample_ht20 fft_sample;
1041 struct ath_radar_info *radar_info;
1042 struct ath_ht20_mag_info *mag_info;
1043 int len = rs->rs_datalen;
1045 u16 length, max_magnitude;
1047 /* AR9280 and before report via ATH9K_PHYERR_RADAR, AR93xx and newer
1048 * via ATH9K_PHYERR_SPECTRAL. Haven't seen ATH9K_PHYERR_FALSE_RADAR_EXT
1049 * yet, but this is supposed to be possible as well.
1051 if (rs->rs_phyerr != ATH9K_PHYERR_RADAR &&
1052 rs->rs_phyerr != ATH9K_PHYERR_FALSE_RADAR_EXT &&
1053 rs->rs_phyerr != ATH9K_PHYERR_SPECTRAL)
1056 /* check if spectral scan bit is set. This does not have to be checked
1057 * if received through a SPECTRAL phy error, but shouldn't hurt.
1059 radar_info = ((struct ath_radar_info *)&vdata[len]) - 1;
1060 if (!(radar_info->pulse_bw_info & SPECTRAL_SCAN_BITMASK))
1063 /* Variation in the data length is possible and will be fixed later.
1064 * Note that we only support HT20 for now.
1066 * TODO: add HT20_40 support as well.
1068 if ((len > SPECTRAL_HT20_TOTAL_DATA_LEN + 2) ||
1069 (len < SPECTRAL_HT20_TOTAL_DATA_LEN - 1))
1072 fft_sample.tlv.type = ATH_FFT_SAMPLE_HT20;
1073 length = sizeof(fft_sample) - sizeof(fft_sample.tlv);
1074 fft_sample.tlv.length = __cpu_to_be16(length);
1076 fft_sample.freq = __cpu_to_be16(ah->curchan->chan->center_freq);
1077 fft_sample.rssi = fix_rssi_inv_only(rs->rs_rssi_ctl0);
1078 fft_sample.noise = ah->noise;
1080 switch (len - SPECTRAL_HT20_TOTAL_DATA_LEN) {
1082 /* length correct, nothing to do. */
1083 memcpy(bins, vdata, SPECTRAL_HT20_NUM_BINS);
1086 /* first byte missing, duplicate it. */
1087 memcpy(&bins[1], vdata, SPECTRAL_HT20_NUM_BINS - 1);
1091 /* MAC added 2 extra bytes at bin 30 and 32, remove them. */
1092 memcpy(bins, vdata, 30);
1093 bins[30] = vdata[31];
1094 memcpy(&bins[31], &vdata[33], SPECTRAL_HT20_NUM_BINS - 31);
1097 /* MAC added 2 extra bytes AND first byte is missing. */
1099 memcpy(&bins[0], vdata, 30);
1100 bins[31] = vdata[31];
1101 memcpy(&bins[32], &vdata[33], SPECTRAL_HT20_NUM_BINS - 32);
1107 /* DC value (value in the middle) is the blind spot of the spectral
1108 * sample and invalid, interpolate it.
1110 dc_pos = SPECTRAL_HT20_NUM_BINS / 2;
1111 bins[dc_pos] = (bins[dc_pos + 1] + bins[dc_pos - 1]) / 2;
1113 /* mag data is at the end of the frame, in front of radar_info */
1114 mag_info = ((struct ath_ht20_mag_info *)radar_info) - 1;
1116 /* copy raw bins without scaling them */
1117 memcpy(fft_sample.data, bins, SPECTRAL_HT20_NUM_BINS);
1118 fft_sample.max_exp = mag_info->max_exp & 0xf;
1120 max_magnitude = spectral_max_magnitude(mag_info->all_bins);
1121 fft_sample.max_magnitude = __cpu_to_be16(max_magnitude);
1122 fft_sample.max_index = spectral_max_index(mag_info->all_bins);
1123 fft_sample.bitmap_weight = spectral_bitmap_weight(mag_info->all_bins);
1124 fft_sample.tsf = __cpu_to_be64(tsf);
1126 ath_debug_send_fft_sample(sc, &fft_sample.tlv);
1133 static void ath9k_apply_ampdu_details(struct ath_softc *sc,
1134 struct ath_rx_status *rs, struct ieee80211_rx_status *rxs)
1136 if (rs->rs_isaggr) {
1137 rxs->flag |= RX_FLAG_AMPDU_DETAILS | RX_FLAG_AMPDU_LAST_KNOWN;
1139 rxs->ampdu_reference = sc->rx.ampdu_ref;
1141 if (!rs->rs_moreaggr) {
1142 rxs->flag |= RX_FLAG_AMPDU_IS_LAST;
1146 if (rs->rs_flags & ATH9K_RX_DELIM_CRC_PRE)
1147 rxs->flag |= RX_FLAG_AMPDU_DELIM_CRC_ERROR;
1151 int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
1154 struct sk_buff *skb = NULL, *requeue_skb, *hdr_skb;
1155 struct ieee80211_rx_status *rxs;
1156 struct ath_hw *ah = sc->sc_ah;
1157 struct ath_common *common = ath9k_hw_common(ah);
1158 struct ieee80211_hw *hw = sc->hw;
1159 struct ieee80211_hdr *hdr;
1161 struct ath_rx_status rs;
1162 enum ath9k_rx_qtype qtype;
1163 bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA);
1165 u8 rx_status_len = ah->caps.rx_status_len;
1168 unsigned long flags;
1171 dma_type = DMA_BIDIRECTIONAL;
1173 dma_type = DMA_FROM_DEVICE;
1175 qtype = hp ? ATH9K_RX_QUEUE_HP : ATH9K_RX_QUEUE_LP;
1177 tsf = ath9k_hw_gettsf64(ah);
1178 tsf_lower = tsf & 0xffffffff;
1181 bool decrypt_error = false;
1183 memset(&rs, 0, sizeof(rs));
1185 bf = ath_edma_get_next_rx_buf(sc, &rs, qtype);
1187 bf = ath_get_next_rx_buf(sc, &rs);
1197 * Take frame header from the first fragment and RX status from
1201 hdr_skb = sc->rx.frag;
1205 hdr = (struct ieee80211_hdr *) (hdr_skb->data + rx_status_len);
1206 rxs = IEEE80211_SKB_RXCB(hdr_skb);
1207 if (ieee80211_is_beacon(hdr->frame_control)) {
1208 RX_STAT_INC(rx_beacons);
1209 if (!is_zero_ether_addr(common->curbssid) &&
1210 ether_addr_equal(hdr->addr3, common->curbssid))
1211 rs.is_mybeacon = true;
1213 rs.is_mybeacon = false;
1216 rs.is_mybeacon = false;
1218 if (ieee80211_is_data_present(hdr->frame_control) &&
1219 !ieee80211_is_qos_nullfunc(hdr->frame_control))
1222 ath_debug_stat_rx(sc, &rs);
1224 memset(rxs, 0, sizeof(struct ieee80211_rx_status));
1226 rxs->mactime = (tsf & ~0xffffffffULL) | rs.rs_tstamp;
1227 if (rs.rs_tstamp > tsf_lower &&
1228 unlikely(rs.rs_tstamp - tsf_lower > 0x10000000))
1229 rxs->mactime -= 0x100000000ULL;
1231 if (rs.rs_tstamp < tsf_lower &&
1232 unlikely(tsf_lower - rs.rs_tstamp > 0x10000000))
1233 rxs->mactime += 0x100000000ULL;
1235 if (rs.rs_phyerr == ATH9K_PHYERR_RADAR)
1236 ath9k_dfs_process_phyerr(sc, hdr, &rs, rxs->mactime);
1238 if (rs.rs_status & ATH9K_RXERR_PHY) {
1239 if (ath_process_fft(sc, hdr, &rs, rxs->mactime)) {
1240 RX_STAT_INC(rx_spectral);
1241 goto requeue_drop_frag;
1245 retval = ath9k_rx_skb_preprocess(common, hw, hdr, &rs,
1246 rxs, &decrypt_error);
1248 goto requeue_drop_frag;
1250 if (rs.is_mybeacon) {
1251 sc->hw_busy_count = 0;
1252 ath_start_rx_poll(sc, 3);
1254 /* Ensure we always have an skb to requeue once we are done
1255 * processing the current buffer's skb */
1256 requeue_skb = ath_rxbuf_alloc(common, common->rx_bufsize, GFP_ATOMIC);
1258 /* If there is no memory we ignore the current RX'd frame,
1259 * tell hardware it can give us a new frame using the old
1260 * skb and put it at the tail of the sc->rx.rxbuf list for
1263 RX_STAT_INC(rx_oom_err);
1264 goto requeue_drop_frag;
1267 /* Unmap the frame */
1268 dma_unmap_single(sc->dev, bf->bf_buf_addr,
1272 skb_put(skb, rs.rs_datalen + ah->caps.rx_status_len);
1273 if (ah->caps.rx_status_len)
1274 skb_pull(skb, ah->caps.rx_status_len);
1277 ath9k_rx_skb_postprocess(common, hdr_skb, &rs,
1278 rxs, decrypt_error);
1280 /* We will now give hardware our shiny new allocated skb */
1281 bf->bf_mpdu = requeue_skb;
1282 bf->bf_buf_addr = dma_map_single(sc->dev, requeue_skb->data,
1285 if (unlikely(dma_mapping_error(sc->dev,
1286 bf->bf_buf_addr))) {
1287 dev_kfree_skb_any(requeue_skb);
1289 bf->bf_buf_addr = 0;
1290 ath_err(common, "dma_mapping_error() on RX\n");
1291 ieee80211_rx(hw, skb);
1296 RX_STAT_INC(rx_frags);
1298 * rs_more indicates chained descriptors which can be
1299 * used to link buffers together for a sort of
1300 * scatter-gather operation.
1303 /* too many fragments - cannot handle frame */
1304 dev_kfree_skb_any(sc->rx.frag);
1305 dev_kfree_skb_any(skb);
1306 RX_STAT_INC(rx_too_many_frags_err);
1314 int space = skb->len - skb_tailroom(hdr_skb);
1316 if (pskb_expand_head(hdr_skb, 0, space, GFP_ATOMIC) < 0) {
1318 RX_STAT_INC(rx_oom_err);
1319 goto requeue_drop_frag;
1324 skb_copy_from_linear_data(skb, skb_put(hdr_skb, skb->len),
1326 dev_kfree_skb_any(skb);
1331 if (ah->caps.hw_caps & ATH9K_HW_CAP_ANT_DIV_COMB) {
1334 * change the default rx antenna if rx diversity
1335 * chooses the other antenna 3 times in a row.
1337 if (sc->rx.defant != rs.rs_antenna) {
1338 if (++sc->rx.rxotherant >= 3)
1339 ath_setdefantenna(sc, rs.rs_antenna);
1341 sc->rx.rxotherant = 0;
1346 if (rxs->flag & RX_FLAG_MMIC_STRIPPED)
1347 skb_trim(skb, skb->len - 8);
1349 spin_lock_irqsave(&sc->sc_pm_lock, flags);
1350 if ((sc->ps_flags & (PS_WAIT_FOR_BEACON |
1352 PS_WAIT_FOR_PSPOLL_DATA)) ||
1353 ath9k_check_auto_sleep(sc))
1354 ath_rx_ps(sc, skb, rs.is_mybeacon);
1355 spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
1357 if ((ah->caps.hw_caps & ATH9K_HW_CAP_ANT_DIV_COMB) && sc->ant_rx == 3)
1358 ath_ant_comb_scan(sc, &rs);
1360 ath9k_apply_ampdu_details(sc, &rs, rxs);
1362 ieee80211_rx(hw, skb);
1366 dev_kfree_skb_any(sc->rx.frag);
1370 list_add_tail(&bf->list, &sc->rx.rxbuf);
1375 ath_rx_edma_buf_link(sc, qtype);
1377 ath_rx_buf_link(sc, bf);
1382 if (!(ah->imask & ATH9K_INT_RXEOL)) {
1383 ah->imask |= (ATH9K_INT_RXEOL | ATH9K_INT_RXORN);
1384 ath9k_hw_set_interrupts(ah);