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_buf **)__skb->cb))
23 static inline bool ath_is_alt_ant_ratio_better(int alt_ratio, int maxdelta,
24 int mindelta, int main_rssi_avg,
25 int alt_rssi_avg, int pkt_count)
27 return (((alt_ratio >= ATH_ANT_DIV_COMB_ALT_ANT_RATIO2) &&
28 (alt_rssi_avg > main_rssi_avg + maxdelta)) ||
29 (alt_rssi_avg > main_rssi_avg + mindelta)) && (pkt_count > 50);
32 static inline bool ath_ant_div_comb_alt_check(u8 div_group, int alt_ratio,
33 int curr_main_set, int curr_alt_set,
34 int alt_rssi_avg, int main_rssi_avg)
39 if (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO)
44 if ((((curr_main_set == ATH_ANT_DIV_COMB_LNA2) &&
45 (curr_alt_set == ATH_ANT_DIV_COMB_LNA1) &&
46 (alt_rssi_avg >= (main_rssi_avg - 5))) ||
47 ((curr_main_set == ATH_ANT_DIV_COMB_LNA1) &&
48 (curr_alt_set == ATH_ANT_DIV_COMB_LNA2) &&
49 (alt_rssi_avg >= (main_rssi_avg - 2)))) &&
60 static inline bool ath9k_check_auto_sleep(struct ath_softc *sc)
62 return sc->ps_enabled &&
63 (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_AUTOSLEEP);
67 * Setup and link descriptors.
69 * 11N: we can no longer afford to self link the last descriptor.
70 * MAC acknowledges BA status as long as it copies frames to host
71 * buffer (or rx fifo). This can incorrectly acknowledge packets
72 * to a sender if last desc is self-linked.
74 static void ath_rx_buf_link(struct ath_softc *sc, struct ath_buf *bf)
76 struct ath_hw *ah = sc->sc_ah;
77 struct ath_common *common = ath9k_hw_common(ah);
84 ds->ds_link = 0; /* link to null */
85 ds->ds_data = bf->bf_buf_addr;
87 /* virtual addr of the beginning of the buffer. */
90 ds->ds_vdata = skb->data;
93 * setup rx descriptors. The rx_bufsize here tells the hardware
94 * how much data it can DMA to us and that we are prepared
97 ath9k_hw_setuprxdesc(ah, ds,
101 if (sc->rx.rxlink == NULL)
102 ath9k_hw_putrxbuf(ah, bf->bf_daddr);
104 *sc->rx.rxlink = bf->bf_daddr;
106 sc->rx.rxlink = &ds->ds_link;
109 static void ath_setdefantenna(struct ath_softc *sc, u32 antenna)
111 /* XXX block beacon interrupts */
112 ath9k_hw_setantenna(sc->sc_ah, antenna);
113 sc->rx.defant = antenna;
114 sc->rx.rxotherant = 0;
117 static void ath_opmode_init(struct ath_softc *sc)
119 struct ath_hw *ah = sc->sc_ah;
120 struct ath_common *common = ath9k_hw_common(ah);
124 /* configure rx filter */
125 rfilt = ath_calcrxfilter(sc);
126 ath9k_hw_setrxfilter(ah, rfilt);
128 /* configure bssid mask */
129 ath_hw_setbssidmask(common);
131 /* configure operational mode */
132 ath9k_hw_setopmode(ah);
134 /* calculate and install multicast filter */
135 mfilt[0] = mfilt[1] = ~0;
136 ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]);
139 static bool ath_rx_edma_buf_link(struct ath_softc *sc,
140 enum ath9k_rx_qtype qtype)
142 struct ath_hw *ah = sc->sc_ah;
143 struct ath_rx_edma *rx_edma;
147 rx_edma = &sc->rx.rx_edma[qtype];
148 if (skb_queue_len(&rx_edma->rx_fifo) >= rx_edma->rx_fifo_hwsize)
151 bf = list_first_entry(&sc->rx.rxbuf, struct ath_buf, list);
152 list_del_init(&bf->list);
157 memset(skb->data, 0, ah->caps.rx_status_len);
158 dma_sync_single_for_device(sc->dev, bf->bf_buf_addr,
159 ah->caps.rx_status_len, DMA_TO_DEVICE);
161 SKB_CB_ATHBUF(skb) = bf;
162 ath9k_hw_addrxbuf_edma(ah, bf->bf_buf_addr, qtype);
163 skb_queue_tail(&rx_edma->rx_fifo, skb);
168 static void ath_rx_addbuffer_edma(struct ath_softc *sc,
169 enum ath9k_rx_qtype qtype, int size)
171 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
174 if (list_empty(&sc->rx.rxbuf)) {
175 ath_dbg(common, ATH_DBG_QUEUE, "No free rx buf available\n");
179 while (!list_empty(&sc->rx.rxbuf)) {
182 if (!ath_rx_edma_buf_link(sc, qtype))
190 static void ath_rx_remove_buffer(struct ath_softc *sc,
191 enum ath9k_rx_qtype qtype)
194 struct ath_rx_edma *rx_edma;
197 rx_edma = &sc->rx.rx_edma[qtype];
199 while ((skb = skb_dequeue(&rx_edma->rx_fifo)) != NULL) {
200 bf = SKB_CB_ATHBUF(skb);
202 list_add_tail(&bf->list, &sc->rx.rxbuf);
206 static void ath_rx_edma_cleanup(struct ath_softc *sc)
208 struct ath_hw *ah = sc->sc_ah;
209 struct ath_common *common = ath9k_hw_common(ah);
212 ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_LP);
213 ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_HP);
215 list_for_each_entry(bf, &sc->rx.rxbuf, list) {
217 dma_unmap_single(sc->dev, bf->bf_buf_addr,
220 dev_kfree_skb_any(bf->bf_mpdu);
226 INIT_LIST_HEAD(&sc->rx.rxbuf);
228 kfree(sc->rx.rx_bufptr);
229 sc->rx.rx_bufptr = NULL;
232 static void ath_rx_edma_init_queue(struct ath_rx_edma *rx_edma, int size)
234 skb_queue_head_init(&rx_edma->rx_fifo);
235 skb_queue_head_init(&rx_edma->rx_buffers);
236 rx_edma->rx_fifo_hwsize = size;
239 static int ath_rx_edma_init(struct ath_softc *sc, int nbufs)
241 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
242 struct ath_hw *ah = sc->sc_ah;
248 ath9k_hw_set_rx_bufsize(ah, common->rx_bufsize -
249 ah->caps.rx_status_len);
251 ath_rx_edma_init_queue(&sc->rx.rx_edma[ATH9K_RX_QUEUE_LP],
252 ah->caps.rx_lp_qdepth);
253 ath_rx_edma_init_queue(&sc->rx.rx_edma[ATH9K_RX_QUEUE_HP],
254 ah->caps.rx_hp_qdepth);
256 size = sizeof(struct ath_buf) * nbufs;
257 bf = kzalloc(size, GFP_KERNEL);
261 INIT_LIST_HEAD(&sc->rx.rxbuf);
262 sc->rx.rx_bufptr = bf;
264 for (i = 0; i < nbufs; i++, bf++) {
265 skb = ath_rxbuf_alloc(common, common->rx_bufsize, GFP_KERNEL);
271 memset(skb->data, 0, common->rx_bufsize);
274 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
277 if (unlikely(dma_mapping_error(sc->dev,
279 dev_kfree_skb_any(skb);
283 "dma_mapping_error() on RX init\n");
288 list_add_tail(&bf->list, &sc->rx.rxbuf);
294 ath_rx_edma_cleanup(sc);
298 static void ath_edma_start_recv(struct ath_softc *sc)
300 spin_lock_bh(&sc->rx.rxbuflock);
302 ath9k_hw_rxena(sc->sc_ah);
304 ath_rx_addbuffer_edma(sc, ATH9K_RX_QUEUE_HP,
305 sc->rx.rx_edma[ATH9K_RX_QUEUE_HP].rx_fifo_hwsize);
307 ath_rx_addbuffer_edma(sc, ATH9K_RX_QUEUE_LP,
308 sc->rx.rx_edma[ATH9K_RX_QUEUE_LP].rx_fifo_hwsize);
312 ath9k_hw_startpcureceive(sc->sc_ah, (sc->sc_flags & SC_OP_OFFCHANNEL));
314 spin_unlock_bh(&sc->rx.rxbuflock);
317 static void ath_edma_stop_recv(struct ath_softc *sc)
319 ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_HP);
320 ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_LP);
323 int ath_rx_init(struct ath_softc *sc, int nbufs)
325 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
330 spin_lock_init(&sc->sc_pcu_lock);
331 sc->sc_flags &= ~SC_OP_RXFLUSH;
332 spin_lock_init(&sc->rx.rxbuflock);
334 common->rx_bufsize = IEEE80211_MAX_MPDU_LEN / 2 +
335 sc->sc_ah->caps.rx_status_len;
337 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
338 return ath_rx_edma_init(sc, nbufs);
340 ath_dbg(common, ATH_DBG_CONFIG, "cachelsz %u rxbufsize %u\n",
341 common->cachelsz, common->rx_bufsize);
343 /* Initialize rx descriptors */
345 error = ath_descdma_setup(sc, &sc->rx.rxdma, &sc->rx.rxbuf,
349 "failed to allocate rx descriptors: %d\n",
354 list_for_each_entry(bf, &sc->rx.rxbuf, list) {
355 skb = ath_rxbuf_alloc(common, common->rx_bufsize,
363 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
366 if (unlikely(dma_mapping_error(sc->dev,
368 dev_kfree_skb_any(skb);
372 "dma_mapping_error() on RX init\n");
377 sc->rx.rxlink = NULL;
387 void ath_rx_cleanup(struct ath_softc *sc)
389 struct ath_hw *ah = sc->sc_ah;
390 struct ath_common *common = ath9k_hw_common(ah);
394 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
395 ath_rx_edma_cleanup(sc);
398 list_for_each_entry(bf, &sc->rx.rxbuf, list) {
401 dma_unmap_single(sc->dev, bf->bf_buf_addr,
410 if (sc->rx.rxdma.dd_desc_len != 0)
411 ath_descdma_cleanup(sc, &sc->rx.rxdma, &sc->rx.rxbuf);
416 * Calculate the receive filter according to the
417 * operating mode and state:
419 * o always accept unicast, broadcast, and multicast traffic
420 * o maintain current state of phy error reception (the hal
421 * may enable phy error frames for noise immunity work)
422 * o probe request frames are accepted only when operating in
423 * hostap, adhoc, or monitor modes
424 * o enable promiscuous mode according to the interface state
426 * - when operating in adhoc mode so the 802.11 layer creates
427 * node table entries for peers,
428 * - when operating in station mode for collecting rssi data when
429 * the station is otherwise quiet, or
430 * - when operating as a repeater so we see repeater-sta beacons
434 u32 ath_calcrxfilter(struct ath_softc *sc)
438 rfilt = ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST
439 | ATH9K_RX_FILTER_MCAST;
441 if (sc->rx.rxfilter & FIF_PROBE_REQ)
442 rfilt |= ATH9K_RX_FILTER_PROBEREQ;
445 * Set promiscuous mode when FIF_PROMISC_IN_BSS is enabled for station
446 * mode interface or when in monitor mode. AP mode does not need this
447 * since it receives all in-BSS frames anyway.
449 if (sc->sc_ah->is_monitoring)
450 rfilt |= ATH9K_RX_FILTER_PROM;
452 if (sc->rx.rxfilter & FIF_CONTROL)
453 rfilt |= ATH9K_RX_FILTER_CONTROL;
455 if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) &&
457 !(sc->rx.rxfilter & FIF_BCN_PRBRESP_PROMISC))
458 rfilt |= ATH9K_RX_FILTER_MYBEACON;
460 rfilt |= ATH9K_RX_FILTER_BEACON;
462 if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) ||
463 (sc->rx.rxfilter & FIF_PSPOLL))
464 rfilt |= ATH9K_RX_FILTER_PSPOLL;
466 if (conf_is_ht(&sc->hw->conf))
467 rfilt |= ATH9K_RX_FILTER_COMP_BAR;
469 if (sc->nvifs > 1 || (sc->rx.rxfilter & FIF_OTHER_BSS)) {
470 /* The following may also be needed for other older chips */
471 if (sc->sc_ah->hw_version.macVersion == AR_SREV_VERSION_9160)
472 rfilt |= ATH9K_RX_FILTER_PROM;
473 rfilt |= ATH9K_RX_FILTER_MCAST_BCAST_ALL;
478 #undef RX_FILTER_PRESERVE
481 int ath_startrecv(struct ath_softc *sc)
483 struct ath_hw *ah = sc->sc_ah;
484 struct ath_buf *bf, *tbf;
486 if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
487 ath_edma_start_recv(sc);
491 spin_lock_bh(&sc->rx.rxbuflock);
492 if (list_empty(&sc->rx.rxbuf))
495 sc->rx.rxlink = NULL;
496 list_for_each_entry_safe(bf, tbf, &sc->rx.rxbuf, list) {
497 ath_rx_buf_link(sc, bf);
500 /* We could have deleted elements so the list may be empty now */
501 if (list_empty(&sc->rx.rxbuf))
504 bf = list_first_entry(&sc->rx.rxbuf, struct ath_buf, list);
505 ath9k_hw_putrxbuf(ah, bf->bf_daddr);
510 ath9k_hw_startpcureceive(ah, (sc->sc_flags & SC_OP_OFFCHANNEL));
512 spin_unlock_bh(&sc->rx.rxbuflock);
517 bool ath_stoprecv(struct ath_softc *sc)
519 struct ath_hw *ah = sc->sc_ah;
520 bool stopped, reset = false;
522 spin_lock_bh(&sc->rx.rxbuflock);
523 ath9k_hw_abortpcurecv(ah);
524 ath9k_hw_setrxfilter(ah, 0);
525 stopped = ath9k_hw_stopdmarecv(ah, &reset);
527 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
528 ath_edma_stop_recv(sc);
530 sc->rx.rxlink = NULL;
531 spin_unlock_bh(&sc->rx.rxbuflock);
533 if (!(ah->ah_flags & AH_UNPLUGGED) &&
534 unlikely(!stopped)) {
535 ath_err(ath9k_hw_common(sc->sc_ah),
536 "Could not stop RX, we could be "
537 "confusing the DMA engine when we start RX up\n");
538 ATH_DBG_WARN_ON_ONCE(!stopped);
540 return stopped && !reset;
543 void ath_flushrecv(struct ath_softc *sc)
545 sc->sc_flags |= SC_OP_RXFLUSH;
546 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
547 ath_rx_tasklet(sc, 1, true);
548 ath_rx_tasklet(sc, 1, false);
549 sc->sc_flags &= ~SC_OP_RXFLUSH;
552 static bool ath_beacon_dtim_pending_cab(struct sk_buff *skb)
554 /* Check whether the Beacon frame has DTIM indicating buffered bc/mc */
555 struct ieee80211_mgmt *mgmt;
556 u8 *pos, *end, id, elen;
557 struct ieee80211_tim_ie *tim;
559 mgmt = (struct ieee80211_mgmt *)skb->data;
560 pos = mgmt->u.beacon.variable;
561 end = skb->data + skb->len;
563 while (pos + 2 < end) {
566 if (pos + elen > end)
569 if (id == WLAN_EID_TIM) {
570 if (elen < sizeof(*tim))
572 tim = (struct ieee80211_tim_ie *) pos;
573 if (tim->dtim_count != 0)
575 return tim->bitmap_ctrl & 0x01;
584 static void ath_rx_ps_beacon(struct ath_softc *sc, struct sk_buff *skb)
586 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
588 if (skb->len < 24 + 8 + 2 + 2)
591 sc->ps_flags &= ~PS_WAIT_FOR_BEACON;
593 if (sc->ps_flags & PS_BEACON_SYNC) {
594 sc->ps_flags &= ~PS_BEACON_SYNC;
595 ath_dbg(common, ATH_DBG_PS,
596 "Reconfigure Beacon timers based on timestamp from the AP\n");
600 if (ath_beacon_dtim_pending_cab(skb)) {
602 * Remain awake waiting for buffered broadcast/multicast
603 * frames. If the last broadcast/multicast frame is not
604 * received properly, the next beacon frame will work as
605 * a backup trigger for returning into NETWORK SLEEP state,
606 * so we are waiting for it as well.
608 ath_dbg(common, ATH_DBG_PS,
609 "Received DTIM beacon indicating buffered broadcast/multicast frame(s)\n");
610 sc->ps_flags |= PS_WAIT_FOR_CAB | PS_WAIT_FOR_BEACON;
614 if (sc->ps_flags & PS_WAIT_FOR_CAB) {
616 * This can happen if a broadcast frame is dropped or the AP
617 * fails to send a frame indicating that all CAB frames have
620 sc->ps_flags &= ~PS_WAIT_FOR_CAB;
621 ath_dbg(common, ATH_DBG_PS,
622 "PS wait for CAB frames timed out\n");
626 static void ath_rx_ps(struct ath_softc *sc, struct sk_buff *skb, bool mybeacon)
628 struct ieee80211_hdr *hdr;
629 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
631 hdr = (struct ieee80211_hdr *)skb->data;
633 /* Process Beacon and CAB receive in PS state */
634 if (((sc->ps_flags & PS_WAIT_FOR_BEACON) || ath9k_check_auto_sleep(sc))
636 ath_rx_ps_beacon(sc, skb);
637 else if ((sc->ps_flags & PS_WAIT_FOR_CAB) &&
638 (ieee80211_is_data(hdr->frame_control) ||
639 ieee80211_is_action(hdr->frame_control)) &&
640 is_multicast_ether_addr(hdr->addr1) &&
641 !ieee80211_has_moredata(hdr->frame_control)) {
643 * No more broadcast/multicast frames to be received at this
646 sc->ps_flags &= ~(PS_WAIT_FOR_CAB | PS_WAIT_FOR_BEACON);
647 ath_dbg(common, ATH_DBG_PS,
648 "All PS CAB frames received, back to sleep\n");
649 } else if ((sc->ps_flags & PS_WAIT_FOR_PSPOLL_DATA) &&
650 !is_multicast_ether_addr(hdr->addr1) &&
651 !ieee80211_has_morefrags(hdr->frame_control)) {
652 sc->ps_flags &= ~PS_WAIT_FOR_PSPOLL_DATA;
653 ath_dbg(common, ATH_DBG_PS,
654 "Going back to sleep after having received PS-Poll data (0x%lx)\n",
655 sc->ps_flags & (PS_WAIT_FOR_BEACON |
657 PS_WAIT_FOR_PSPOLL_DATA |
658 PS_WAIT_FOR_TX_ACK));
662 static bool ath_edma_get_buffers(struct ath_softc *sc,
663 enum ath9k_rx_qtype qtype)
665 struct ath_rx_edma *rx_edma = &sc->rx.rx_edma[qtype];
666 struct ath_hw *ah = sc->sc_ah;
667 struct ath_common *common = ath9k_hw_common(ah);
672 skb = skb_peek(&rx_edma->rx_fifo);
676 bf = SKB_CB_ATHBUF(skb);
679 dma_sync_single_for_cpu(sc->dev, bf->bf_buf_addr,
680 common->rx_bufsize, DMA_FROM_DEVICE);
682 ret = ath9k_hw_process_rxdesc_edma(ah, NULL, skb->data);
683 if (ret == -EINPROGRESS) {
684 /*let device gain the buffer again*/
685 dma_sync_single_for_device(sc->dev, bf->bf_buf_addr,
686 common->rx_bufsize, DMA_FROM_DEVICE);
690 __skb_unlink(skb, &rx_edma->rx_fifo);
691 if (ret == -EINVAL) {
692 /* corrupt descriptor, skip this one and the following one */
693 list_add_tail(&bf->list, &sc->rx.rxbuf);
694 ath_rx_edma_buf_link(sc, qtype);
695 skb = skb_peek(&rx_edma->rx_fifo);
699 bf = SKB_CB_ATHBUF(skb);
702 __skb_unlink(skb, &rx_edma->rx_fifo);
703 list_add_tail(&bf->list, &sc->rx.rxbuf);
704 ath_rx_edma_buf_link(sc, qtype);
707 skb_queue_tail(&rx_edma->rx_buffers, skb);
712 static struct ath_buf *ath_edma_get_next_rx_buf(struct ath_softc *sc,
713 struct ath_rx_status *rs,
714 enum ath9k_rx_qtype qtype)
716 struct ath_rx_edma *rx_edma = &sc->rx.rx_edma[qtype];
720 while (ath_edma_get_buffers(sc, qtype));
721 skb = __skb_dequeue(&rx_edma->rx_buffers);
725 bf = SKB_CB_ATHBUF(skb);
726 ath9k_hw_process_rxdesc_edma(sc->sc_ah, rs, skb->data);
730 static struct ath_buf *ath_get_next_rx_buf(struct ath_softc *sc,
731 struct ath_rx_status *rs)
733 struct ath_hw *ah = sc->sc_ah;
734 struct ath_common *common = ath9k_hw_common(ah);
739 if (list_empty(&sc->rx.rxbuf)) {
740 sc->rx.rxlink = NULL;
744 bf = list_first_entry(&sc->rx.rxbuf, struct ath_buf, list);
748 * Must provide the virtual address of the current
749 * descriptor, the physical address, and the virtual
750 * address of the next descriptor in the h/w chain.
751 * This allows the HAL to look ahead to see if the
752 * hardware is done with a descriptor by checking the
753 * done bit in the following descriptor and the address
754 * of the current descriptor the DMA engine is working
755 * on. All this is necessary because of our use of
756 * a self-linked list to avoid rx overruns.
758 ret = ath9k_hw_rxprocdesc(ah, ds, rs);
759 if (ret == -EINPROGRESS) {
760 struct ath_rx_status trs;
762 struct ath_desc *tds;
764 memset(&trs, 0, sizeof(trs));
765 if (list_is_last(&bf->list, &sc->rx.rxbuf)) {
766 sc->rx.rxlink = NULL;
770 tbf = list_entry(bf->list.next, struct ath_buf, list);
773 * On some hardware the descriptor status words could
774 * get corrupted, including the done bit. Because of
775 * this, check if the next descriptor's done bit is
778 * If the next descriptor's done bit is set, the current
779 * descriptor has been corrupted. Force s/w to discard
780 * this descriptor and continue...
784 ret = ath9k_hw_rxprocdesc(ah, tds, &trs);
785 if (ret == -EINPROGRESS)
793 * Synchronize the DMA transfer with CPU before
794 * 1. accessing the frame
795 * 2. requeueing the same buffer to h/w
797 dma_sync_single_for_cpu(sc->dev, bf->bf_buf_addr,
804 /* Assumes you've already done the endian to CPU conversion */
805 static bool ath9k_rx_accept(struct ath_common *common,
806 struct ieee80211_hdr *hdr,
807 struct ieee80211_rx_status *rxs,
808 struct ath_rx_status *rx_stats,
811 struct ath_softc *sc = (struct ath_softc *) common->priv;
812 bool is_mc, is_valid_tkip, strip_mic, mic_error;
813 struct ath_hw *ah = common->ah;
815 u8 rx_status_len = ah->caps.rx_status_len;
817 fc = hdr->frame_control;
819 is_mc = !!is_multicast_ether_addr(hdr->addr1);
820 is_valid_tkip = rx_stats->rs_keyix != ATH9K_RXKEYIX_INVALID &&
821 test_bit(rx_stats->rs_keyix, common->tkip_keymap);
822 strip_mic = is_valid_tkip && ieee80211_is_data(fc) &&
823 !(rx_stats->rs_status &
824 (ATH9K_RXERR_DECRYPT | ATH9K_RXERR_CRC | ATH9K_RXERR_MIC |
825 ATH9K_RXERR_KEYMISS));
828 * Key miss events are only relevant for pairwise keys where the
829 * descriptor does contain a valid key index. This has been observed
830 * mostly with CCMP encryption.
832 if (rx_stats->rs_keyix == ATH9K_RXKEYIX_INVALID ||
833 !test_bit(rx_stats->rs_keyix, common->ccmp_keymap))
834 rx_stats->rs_status &= ~ATH9K_RXERR_KEYMISS;
836 if (!rx_stats->rs_datalen)
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 - rx_status_len))
846 /* Only use error bits from the last fragment */
847 if (rx_stats->rs_more)
850 mic_error = is_valid_tkip && !ieee80211_is_ctl(fc) &&
851 !ieee80211_has_morefrags(fc) &&
852 !(le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG) &&
853 (rx_stats->rs_status & ATH9K_RXERR_MIC);
856 * The rx_stats->rs_status will not be set until the end of the
857 * chained descriptors so it can be ignored if rs_more is set. The
858 * rs_more will be false at the last element of the chained
861 if (rx_stats->rs_status != 0) {
864 if (rx_stats->rs_status & ATH9K_RXERR_CRC) {
865 rxs->flag |= RX_FLAG_FAILED_FCS_CRC;
868 if (rx_stats->rs_status & ATH9K_RXERR_PHY)
871 if ((rx_stats->rs_status & ATH9K_RXERR_DECRYPT) ||
872 (!is_mc && (rx_stats->rs_status & ATH9K_RXERR_KEYMISS))) {
873 *decrypt_error = true;
878 * Reject error frames with the exception of
879 * decryption and MIC failures. For monitor mode,
880 * we also ignore the CRC error.
882 status_mask = ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC |
885 if (ah->is_monitoring && (sc->rx.rxfilter & FIF_FCSFAIL))
886 status_mask |= ATH9K_RXERR_CRC;
888 if (rx_stats->rs_status & ~status_mask)
893 * For unicast frames the MIC error bit can have false positives,
894 * so all MIC error reports need to be validated in software.
895 * False negatives are not common, so skip software verification
896 * if the hardware considers the MIC valid.
899 rxs->flag |= RX_FLAG_MMIC_STRIPPED;
900 else if (is_mc && mic_error)
901 rxs->flag |= RX_FLAG_MMIC_ERROR;
906 static int ath9k_process_rate(struct ath_common *common,
907 struct ieee80211_hw *hw,
908 struct ath_rx_status *rx_stats,
909 struct ieee80211_rx_status *rxs)
911 struct ieee80211_supported_band *sband;
912 enum ieee80211_band band;
915 band = hw->conf.channel->band;
916 sband = hw->wiphy->bands[band];
918 if (rx_stats->rs_rate & 0x80) {
920 rxs->flag |= RX_FLAG_HT;
921 if (rx_stats->rs_flags & ATH9K_RX_2040)
922 rxs->flag |= RX_FLAG_40MHZ;
923 if (rx_stats->rs_flags & ATH9K_RX_GI)
924 rxs->flag |= RX_FLAG_SHORT_GI;
925 rxs->rate_idx = rx_stats->rs_rate & 0x7f;
929 for (i = 0; i < sband->n_bitrates; i++) {
930 if (sband->bitrates[i].hw_value == rx_stats->rs_rate) {
934 if (sband->bitrates[i].hw_value_short == rx_stats->rs_rate) {
935 rxs->flag |= RX_FLAG_SHORTPRE;
942 * No valid hardware bitrate found -- we should not get here
943 * because hardware has already validated this frame as OK.
945 ath_dbg(common, ATH_DBG_ANY,
946 "unsupported hw bitrate detected 0x%02x using 1 Mbit\n",
952 static void ath9k_process_rssi(struct ath_common *common,
953 struct ieee80211_hw *hw,
954 struct ieee80211_hdr *hdr,
955 struct ath_rx_status *rx_stats)
957 struct ath_softc *sc = hw->priv;
958 struct ath_hw *ah = common->ah;
961 if (!rx_stats->is_mybeacon ||
962 ((ah->opmode != NL80211_IFTYPE_STATION) &&
963 (ah->opmode != NL80211_IFTYPE_ADHOC)))
966 if (rx_stats->rs_rssi != ATH9K_RSSI_BAD && !rx_stats->rs_moreaggr)
967 ATH_RSSI_LPF(sc->last_rssi, rx_stats->rs_rssi);
969 last_rssi = sc->last_rssi;
970 if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER))
971 rx_stats->rs_rssi = ATH_EP_RND(last_rssi,
972 ATH_RSSI_EP_MULTIPLIER);
973 if (rx_stats->rs_rssi < 0)
974 rx_stats->rs_rssi = 0;
976 /* Update Beacon RSSI, this is used by ANI. */
977 ah->stats.avgbrssi = rx_stats->rs_rssi;
981 * For Decrypt or Demic errors, we only mark packet status here and always push
982 * up the frame up to let mac80211 handle the actual error case, be it no
983 * decryption key or real decryption error. This let us keep statistics there.
985 static int ath9k_rx_skb_preprocess(struct ath_common *common,
986 struct ieee80211_hw *hw,
987 struct ieee80211_hdr *hdr,
988 struct ath_rx_status *rx_stats,
989 struct ieee80211_rx_status *rx_status,
992 struct ath_hw *ah = common->ah;
994 memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
997 * everything but the rate is checked here, the rate check is done
998 * separately to avoid doing two lookups for a rate for each frame.
1000 if (!ath9k_rx_accept(common, hdr, rx_status, rx_stats, decrypt_error))
1003 /* Only use status info from the last fragment */
1004 if (rx_stats->rs_more)
1007 ath9k_process_rssi(common, hw, hdr, rx_stats);
1009 if (ath9k_process_rate(common, hw, rx_stats, rx_status))
1012 rx_status->band = hw->conf.channel->band;
1013 rx_status->freq = hw->conf.channel->center_freq;
1014 rx_status->signal = ah->noise + rx_stats->rs_rssi;
1015 rx_status->antenna = rx_stats->rs_antenna;
1016 rx_status->flag |= RX_FLAG_MACTIME_MPDU;
1021 static void ath9k_rx_skb_postprocess(struct ath_common *common,
1022 struct sk_buff *skb,
1023 struct ath_rx_status *rx_stats,
1024 struct ieee80211_rx_status *rxs,
1027 struct ath_hw *ah = common->ah;
1028 struct ieee80211_hdr *hdr;
1029 int hdrlen, padpos, padsize;
1033 /* see if any padding is done by the hw and remove it */
1034 hdr = (struct ieee80211_hdr *) skb->data;
1035 hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1036 fc = hdr->frame_control;
1037 padpos = ath9k_cmn_padpos(hdr->frame_control);
1039 /* The MAC header is padded to have 32-bit boundary if the
1040 * packet payload is non-zero. The general calculation for
1041 * padsize would take into account odd header lengths:
1042 * padsize = (4 - padpos % 4) % 4; However, since only
1043 * even-length headers are used, padding can only be 0 or 2
1044 * bytes and we can optimize this a bit. In addition, we must
1045 * not try to remove padding from short control frames that do
1046 * not have payload. */
1047 padsize = padpos & 3;
1048 if (padsize && skb->len>=padpos+padsize+FCS_LEN) {
1049 memmove(skb->data + padsize, skb->data, padpos);
1050 skb_pull(skb, padsize);
1053 keyix = rx_stats->rs_keyix;
1055 if (!(keyix == ATH9K_RXKEYIX_INVALID) && !decrypt_error &&
1056 ieee80211_has_protected(fc)) {
1057 rxs->flag |= RX_FLAG_DECRYPTED;
1058 } else if (ieee80211_has_protected(fc)
1059 && !decrypt_error && skb->len >= hdrlen + 4) {
1060 keyix = skb->data[hdrlen + 3] >> 6;
1062 if (test_bit(keyix, common->keymap))
1063 rxs->flag |= RX_FLAG_DECRYPTED;
1065 if (ah->sw_mgmt_crypto &&
1066 (rxs->flag & RX_FLAG_DECRYPTED) &&
1067 ieee80211_is_mgmt(fc))
1068 /* Use software decrypt for management frames. */
1069 rxs->flag &= ~RX_FLAG_DECRYPTED;
1072 static void ath_lnaconf_alt_good_scan(struct ath_ant_comb *antcomb,
1073 struct ath_hw_antcomb_conf ant_conf,
1076 antcomb->quick_scan_cnt = 0;
1078 if (ant_conf.main_lna_conf == ATH_ANT_DIV_COMB_LNA2)
1079 antcomb->rssi_lna2 = main_rssi_avg;
1080 else if (ant_conf.main_lna_conf == ATH_ANT_DIV_COMB_LNA1)
1081 antcomb->rssi_lna1 = main_rssi_avg;
1083 switch ((ant_conf.main_lna_conf << 4) | ant_conf.alt_lna_conf) {
1084 case 0x10: /* LNA2 A-B */
1085 antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
1086 antcomb->first_quick_scan_conf =
1087 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
1088 antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA1;
1090 case 0x20: /* LNA1 A-B */
1091 antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
1092 antcomb->first_quick_scan_conf =
1093 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
1094 antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA2;
1096 case 0x21: /* LNA1 LNA2 */
1097 antcomb->main_conf = ATH_ANT_DIV_COMB_LNA2;
1098 antcomb->first_quick_scan_conf =
1099 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
1100 antcomb->second_quick_scan_conf =
1101 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
1103 case 0x12: /* LNA2 LNA1 */
1104 antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1;
1105 antcomb->first_quick_scan_conf =
1106 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
1107 antcomb->second_quick_scan_conf =
1108 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
1110 case 0x13: /* LNA2 A+B */
1111 antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
1112 antcomb->first_quick_scan_conf =
1113 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
1114 antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA1;
1116 case 0x23: /* LNA1 A+B */
1117 antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
1118 antcomb->first_quick_scan_conf =
1119 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
1120 antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA2;
1127 static void ath_select_ant_div_from_quick_scan(struct ath_ant_comb *antcomb,
1128 struct ath_hw_antcomb_conf *div_ant_conf,
1129 int main_rssi_avg, int alt_rssi_avg,
1133 switch (antcomb->quick_scan_cnt) {
1135 /* set alt to main, and alt to first conf */
1136 div_ant_conf->main_lna_conf = antcomb->main_conf;
1137 div_ant_conf->alt_lna_conf = antcomb->first_quick_scan_conf;
1140 /* set alt to main, and alt to first conf */
1141 div_ant_conf->main_lna_conf = antcomb->main_conf;
1142 div_ant_conf->alt_lna_conf = antcomb->second_quick_scan_conf;
1143 antcomb->rssi_first = main_rssi_avg;
1144 antcomb->rssi_second = alt_rssi_avg;
1146 if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1) {
1148 if (ath_is_alt_ant_ratio_better(alt_ratio,
1149 ATH_ANT_DIV_COMB_LNA1_DELTA_HI,
1150 ATH_ANT_DIV_COMB_LNA1_DELTA_LOW,
1151 main_rssi_avg, alt_rssi_avg,
1152 antcomb->total_pkt_count))
1153 antcomb->first_ratio = true;
1155 antcomb->first_ratio = false;
1156 } else if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2) {
1157 if (ath_is_alt_ant_ratio_better(alt_ratio,
1158 ATH_ANT_DIV_COMB_LNA1_DELTA_MID,
1159 ATH_ANT_DIV_COMB_LNA1_DELTA_LOW,
1160 main_rssi_avg, alt_rssi_avg,
1161 antcomb->total_pkt_count))
1162 antcomb->first_ratio = true;
1164 antcomb->first_ratio = false;
1166 if ((((alt_ratio >= ATH_ANT_DIV_COMB_ALT_ANT_RATIO2) &&
1167 (alt_rssi_avg > main_rssi_avg +
1168 ATH_ANT_DIV_COMB_LNA1_DELTA_HI)) ||
1169 (alt_rssi_avg > main_rssi_avg)) &&
1170 (antcomb->total_pkt_count > 50))
1171 antcomb->first_ratio = true;
1173 antcomb->first_ratio = false;
1177 antcomb->alt_good = false;
1178 antcomb->scan_not_start = false;
1179 antcomb->scan = false;
1180 antcomb->rssi_first = main_rssi_avg;
1181 antcomb->rssi_third = alt_rssi_avg;
1183 if (antcomb->second_quick_scan_conf == ATH_ANT_DIV_COMB_LNA1)
1184 antcomb->rssi_lna1 = alt_rssi_avg;
1185 else if (antcomb->second_quick_scan_conf ==
1186 ATH_ANT_DIV_COMB_LNA2)
1187 antcomb->rssi_lna2 = alt_rssi_avg;
1188 else if (antcomb->second_quick_scan_conf ==
1189 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2) {
1190 if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2)
1191 antcomb->rssi_lna2 = main_rssi_avg;
1192 else if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1)
1193 antcomb->rssi_lna1 = main_rssi_avg;
1196 if (antcomb->rssi_lna2 > antcomb->rssi_lna1 +
1197 ATH_ANT_DIV_COMB_LNA1_LNA2_SWITCH_DELTA)
1198 div_ant_conf->main_lna_conf = ATH_ANT_DIV_COMB_LNA2;
1200 div_ant_conf->main_lna_conf = ATH_ANT_DIV_COMB_LNA1;
1202 if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1) {
1203 if (ath_is_alt_ant_ratio_better(alt_ratio,
1204 ATH_ANT_DIV_COMB_LNA1_DELTA_HI,
1205 ATH_ANT_DIV_COMB_LNA1_DELTA_LOW,
1206 main_rssi_avg, alt_rssi_avg,
1207 antcomb->total_pkt_count))
1208 antcomb->second_ratio = true;
1210 antcomb->second_ratio = false;
1211 } else if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2) {
1212 if (ath_is_alt_ant_ratio_better(alt_ratio,
1213 ATH_ANT_DIV_COMB_LNA1_DELTA_MID,
1214 ATH_ANT_DIV_COMB_LNA1_DELTA_LOW,
1215 main_rssi_avg, alt_rssi_avg,
1216 antcomb->total_pkt_count))
1217 antcomb->second_ratio = true;
1219 antcomb->second_ratio = false;
1221 if ((((alt_ratio >= ATH_ANT_DIV_COMB_ALT_ANT_RATIO2) &&
1222 (alt_rssi_avg > main_rssi_avg +
1223 ATH_ANT_DIV_COMB_LNA1_DELTA_HI)) ||
1224 (alt_rssi_avg > main_rssi_avg)) &&
1225 (antcomb->total_pkt_count > 50))
1226 antcomb->second_ratio = true;
1228 antcomb->second_ratio = false;
1231 /* set alt to the conf with maximun ratio */
1232 if (antcomb->first_ratio && antcomb->second_ratio) {
1233 if (antcomb->rssi_second > antcomb->rssi_third) {
1235 if ((antcomb->first_quick_scan_conf ==
1236 ATH_ANT_DIV_COMB_LNA1) ||
1237 (antcomb->first_quick_scan_conf ==
1238 ATH_ANT_DIV_COMB_LNA2))
1239 /* Set alt LNA1 or LNA2*/
1240 if (div_ant_conf->main_lna_conf ==
1241 ATH_ANT_DIV_COMB_LNA2)
1242 div_ant_conf->alt_lna_conf =
1243 ATH_ANT_DIV_COMB_LNA1;
1245 div_ant_conf->alt_lna_conf =
1246 ATH_ANT_DIV_COMB_LNA2;
1248 /* Set alt to A+B or A-B */
1249 div_ant_conf->alt_lna_conf =
1250 antcomb->first_quick_scan_conf;
1251 } else if ((antcomb->second_quick_scan_conf ==
1252 ATH_ANT_DIV_COMB_LNA1) ||
1253 (antcomb->second_quick_scan_conf ==
1254 ATH_ANT_DIV_COMB_LNA2)) {
1255 /* Set alt LNA1 or LNA2 */
1256 if (div_ant_conf->main_lna_conf ==
1257 ATH_ANT_DIV_COMB_LNA2)
1258 div_ant_conf->alt_lna_conf =
1259 ATH_ANT_DIV_COMB_LNA1;
1261 div_ant_conf->alt_lna_conf =
1262 ATH_ANT_DIV_COMB_LNA2;
1264 /* Set alt to A+B or A-B */
1265 div_ant_conf->alt_lna_conf =
1266 antcomb->second_quick_scan_conf;
1268 } else if (antcomb->first_ratio) {
1270 if ((antcomb->first_quick_scan_conf ==
1271 ATH_ANT_DIV_COMB_LNA1) ||
1272 (antcomb->first_quick_scan_conf ==
1273 ATH_ANT_DIV_COMB_LNA2))
1274 /* Set alt LNA1 or LNA2 */
1275 if (div_ant_conf->main_lna_conf ==
1276 ATH_ANT_DIV_COMB_LNA2)
1277 div_ant_conf->alt_lna_conf =
1278 ATH_ANT_DIV_COMB_LNA1;
1280 div_ant_conf->alt_lna_conf =
1281 ATH_ANT_DIV_COMB_LNA2;
1283 /* Set alt to A+B or A-B */
1284 div_ant_conf->alt_lna_conf =
1285 antcomb->first_quick_scan_conf;
1286 } else if (antcomb->second_ratio) {
1288 if ((antcomb->second_quick_scan_conf ==
1289 ATH_ANT_DIV_COMB_LNA1) ||
1290 (antcomb->second_quick_scan_conf ==
1291 ATH_ANT_DIV_COMB_LNA2))
1292 /* Set alt LNA1 or LNA2 */
1293 if (div_ant_conf->main_lna_conf ==
1294 ATH_ANT_DIV_COMB_LNA2)
1295 div_ant_conf->alt_lna_conf =
1296 ATH_ANT_DIV_COMB_LNA1;
1298 div_ant_conf->alt_lna_conf =
1299 ATH_ANT_DIV_COMB_LNA2;
1301 /* Set alt to A+B or A-B */
1302 div_ant_conf->alt_lna_conf =
1303 antcomb->second_quick_scan_conf;
1305 /* main is largest */
1306 if ((antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1) ||
1307 (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2))
1308 /* Set alt LNA1 or LNA2 */
1309 if (div_ant_conf->main_lna_conf ==
1310 ATH_ANT_DIV_COMB_LNA2)
1311 div_ant_conf->alt_lna_conf =
1312 ATH_ANT_DIV_COMB_LNA1;
1314 div_ant_conf->alt_lna_conf =
1315 ATH_ANT_DIV_COMB_LNA2;
1317 /* Set alt to A+B or A-B */
1318 div_ant_conf->alt_lna_conf = antcomb->main_conf;
1326 static void ath_ant_div_conf_fast_divbias(struct ath_hw_antcomb_conf *ant_conf,
1327 struct ath_ant_comb *antcomb, int alt_ratio)
1329 if (ant_conf->div_group == 0) {
1330 /* Adjust the fast_div_bias based on main and alt lna conf */
1331 switch ((ant_conf->main_lna_conf << 4) |
1332 ant_conf->alt_lna_conf) {
1333 case 0x01: /* A-B LNA2 */
1334 ant_conf->fast_div_bias = 0x3b;
1336 case 0x02: /* A-B LNA1 */
1337 ant_conf->fast_div_bias = 0x3d;
1339 case 0x03: /* A-B A+B */
1340 ant_conf->fast_div_bias = 0x1;
1342 case 0x10: /* LNA2 A-B */
1343 ant_conf->fast_div_bias = 0x7;
1345 case 0x12: /* LNA2 LNA1 */
1346 ant_conf->fast_div_bias = 0x2;
1348 case 0x13: /* LNA2 A+B */
1349 ant_conf->fast_div_bias = 0x7;
1351 case 0x20: /* LNA1 A-B */
1352 ant_conf->fast_div_bias = 0x6;
1354 case 0x21: /* LNA1 LNA2 */
1355 ant_conf->fast_div_bias = 0x0;
1357 case 0x23: /* LNA1 A+B */
1358 ant_conf->fast_div_bias = 0x6;
1360 case 0x30: /* A+B A-B */
1361 ant_conf->fast_div_bias = 0x1;
1363 case 0x31: /* A+B LNA2 */
1364 ant_conf->fast_div_bias = 0x3b;
1366 case 0x32: /* A+B LNA1 */
1367 ant_conf->fast_div_bias = 0x3d;
1372 } else if (ant_conf->div_group == 1) {
1373 /* Adjust the fast_div_bias based on main and alt_lna_conf */
1374 switch ((ant_conf->main_lna_conf << 4) |
1375 ant_conf->alt_lna_conf) {
1376 case 0x01: /* A-B LNA2 */
1377 ant_conf->fast_div_bias = 0x1;
1378 ant_conf->main_gaintb = 0;
1379 ant_conf->alt_gaintb = 0;
1381 case 0x02: /* A-B LNA1 */
1382 ant_conf->fast_div_bias = 0x1;
1383 ant_conf->main_gaintb = 0;
1384 ant_conf->alt_gaintb = 0;
1386 case 0x03: /* A-B A+B */
1387 ant_conf->fast_div_bias = 0x1;
1388 ant_conf->main_gaintb = 0;
1389 ant_conf->alt_gaintb = 0;
1391 case 0x10: /* LNA2 A-B */
1392 if (!(antcomb->scan) &&
1393 (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO))
1394 ant_conf->fast_div_bias = 0x3f;
1396 ant_conf->fast_div_bias = 0x1;
1397 ant_conf->main_gaintb = 0;
1398 ant_conf->alt_gaintb = 0;
1400 case 0x12: /* LNA2 LNA1 */
1401 ant_conf->fast_div_bias = 0x1;
1402 ant_conf->main_gaintb = 0;
1403 ant_conf->alt_gaintb = 0;
1405 case 0x13: /* LNA2 A+B */
1406 if (!(antcomb->scan) &&
1407 (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO))
1408 ant_conf->fast_div_bias = 0x3f;
1410 ant_conf->fast_div_bias = 0x1;
1411 ant_conf->main_gaintb = 0;
1412 ant_conf->alt_gaintb = 0;
1414 case 0x20: /* LNA1 A-B */
1415 if (!(antcomb->scan) &&
1416 (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO))
1417 ant_conf->fast_div_bias = 0x3f;
1419 ant_conf->fast_div_bias = 0x1;
1420 ant_conf->main_gaintb = 0;
1421 ant_conf->alt_gaintb = 0;
1423 case 0x21: /* LNA1 LNA2 */
1424 ant_conf->fast_div_bias = 0x1;
1425 ant_conf->main_gaintb = 0;
1426 ant_conf->alt_gaintb = 0;
1428 case 0x23: /* LNA1 A+B */
1429 if (!(antcomb->scan) &&
1430 (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO))
1431 ant_conf->fast_div_bias = 0x3f;
1433 ant_conf->fast_div_bias = 0x1;
1434 ant_conf->main_gaintb = 0;
1435 ant_conf->alt_gaintb = 0;
1437 case 0x30: /* A+B A-B */
1438 ant_conf->fast_div_bias = 0x1;
1439 ant_conf->main_gaintb = 0;
1440 ant_conf->alt_gaintb = 0;
1442 case 0x31: /* A+B LNA2 */
1443 ant_conf->fast_div_bias = 0x1;
1444 ant_conf->main_gaintb = 0;
1445 ant_conf->alt_gaintb = 0;
1447 case 0x32: /* A+B LNA1 */
1448 ant_conf->fast_div_bias = 0x1;
1449 ant_conf->main_gaintb = 0;
1450 ant_conf->alt_gaintb = 0;
1455 } else if (ant_conf->div_group == 2) {
1456 /* Adjust the fast_div_bias based on main and alt_lna_conf */
1457 switch ((ant_conf->main_lna_conf << 4) |
1458 ant_conf->alt_lna_conf) {
1459 case 0x01: /* A-B LNA2 */
1460 ant_conf->fast_div_bias = 0x1;
1461 ant_conf->main_gaintb = 0;
1462 ant_conf->alt_gaintb = 0;
1464 case 0x02: /* A-B LNA1 */
1465 ant_conf->fast_div_bias = 0x1;
1466 ant_conf->main_gaintb = 0;
1467 ant_conf->alt_gaintb = 0;
1469 case 0x03: /* A-B A+B */
1470 ant_conf->fast_div_bias = 0x1;
1471 ant_conf->main_gaintb = 0;
1472 ant_conf->alt_gaintb = 0;
1474 case 0x10: /* LNA2 A-B */
1475 if (!(antcomb->scan) &&
1476 (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO))
1477 ant_conf->fast_div_bias = 0x1;
1479 ant_conf->fast_div_bias = 0x2;
1480 ant_conf->main_gaintb = 0;
1481 ant_conf->alt_gaintb = 0;
1483 case 0x12: /* LNA2 LNA1 */
1484 ant_conf->fast_div_bias = 0x1;
1485 ant_conf->main_gaintb = 0;
1486 ant_conf->alt_gaintb = 0;
1488 case 0x13: /* LNA2 A+B */
1489 if (!(antcomb->scan) &&
1490 (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO))
1491 ant_conf->fast_div_bias = 0x1;
1493 ant_conf->fast_div_bias = 0x2;
1494 ant_conf->main_gaintb = 0;
1495 ant_conf->alt_gaintb = 0;
1497 case 0x20: /* LNA1 A-B */
1498 if (!(antcomb->scan) &&
1499 (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO))
1500 ant_conf->fast_div_bias = 0x1;
1502 ant_conf->fast_div_bias = 0x2;
1503 ant_conf->main_gaintb = 0;
1504 ant_conf->alt_gaintb = 0;
1506 case 0x21: /* LNA1 LNA2 */
1507 ant_conf->fast_div_bias = 0x1;
1508 ant_conf->main_gaintb = 0;
1509 ant_conf->alt_gaintb = 0;
1511 case 0x23: /* LNA1 A+B */
1512 if (!(antcomb->scan) &&
1513 (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO))
1514 ant_conf->fast_div_bias = 0x1;
1516 ant_conf->fast_div_bias = 0x2;
1517 ant_conf->main_gaintb = 0;
1518 ant_conf->alt_gaintb = 0;
1520 case 0x30: /* A+B A-B */
1521 ant_conf->fast_div_bias = 0x1;
1522 ant_conf->main_gaintb = 0;
1523 ant_conf->alt_gaintb = 0;
1525 case 0x31: /* A+B LNA2 */
1526 ant_conf->fast_div_bias = 0x1;
1527 ant_conf->main_gaintb = 0;
1528 ant_conf->alt_gaintb = 0;
1530 case 0x32: /* A+B LNA1 */
1531 ant_conf->fast_div_bias = 0x1;
1532 ant_conf->main_gaintb = 0;
1533 ant_conf->alt_gaintb = 0;
1541 /* Antenna diversity and combining */
1542 static void ath_ant_comb_scan(struct ath_softc *sc, struct ath_rx_status *rs)
1544 struct ath_hw_antcomb_conf div_ant_conf;
1545 struct ath_ant_comb *antcomb = &sc->ant_comb;
1546 int alt_ratio = 0, alt_rssi_avg = 0, main_rssi_avg = 0, curr_alt_set;
1548 int main_rssi = rs->rs_rssi_ctl0;
1549 int alt_rssi = rs->rs_rssi_ctl1;
1550 int rx_ant_conf, main_ant_conf;
1551 bool short_scan = false;
1553 rx_ant_conf = (rs->rs_rssi_ctl2 >> ATH_ANT_RX_CURRENT_SHIFT) &
1555 main_ant_conf = (rs->rs_rssi_ctl2 >> ATH_ANT_RX_MAIN_SHIFT) &
1558 /* Record packet only when both main_rssi and alt_rssi is positive */
1559 if (main_rssi > 0 && alt_rssi > 0) {
1560 antcomb->total_pkt_count++;
1561 antcomb->main_total_rssi += main_rssi;
1562 antcomb->alt_total_rssi += alt_rssi;
1563 if (main_ant_conf == rx_ant_conf)
1564 antcomb->main_recv_cnt++;
1566 antcomb->alt_recv_cnt++;
1569 /* Short scan check */
1570 if (antcomb->scan && antcomb->alt_good) {
1571 if (time_after(jiffies, antcomb->scan_start_time +
1572 msecs_to_jiffies(ATH_ANT_DIV_COMB_SHORT_SCAN_INTR)))
1575 if (antcomb->total_pkt_count ==
1576 ATH_ANT_DIV_COMB_SHORT_SCAN_PKTCOUNT) {
1577 alt_ratio = ((antcomb->alt_recv_cnt * 100) /
1578 antcomb->total_pkt_count);
1579 if (alt_ratio < ATH_ANT_DIV_COMB_ALT_ANT_RATIO)
1584 if (((antcomb->total_pkt_count < ATH_ANT_DIV_COMB_MAX_PKTCOUNT) ||
1585 rs->rs_moreaggr) && !short_scan)
1588 if (antcomb->total_pkt_count) {
1589 alt_ratio = ((antcomb->alt_recv_cnt * 100) /
1590 antcomb->total_pkt_count);
1591 main_rssi_avg = (antcomb->main_total_rssi /
1592 antcomb->total_pkt_count);
1593 alt_rssi_avg = (antcomb->alt_total_rssi /
1594 antcomb->total_pkt_count);
1598 ath9k_hw_antdiv_comb_conf_get(sc->sc_ah, &div_ant_conf);
1599 curr_alt_set = div_ant_conf.alt_lna_conf;
1600 curr_main_set = div_ant_conf.main_lna_conf;
1604 if (antcomb->count == ATH_ANT_DIV_COMB_MAX_COUNT) {
1605 if (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO) {
1606 ath_lnaconf_alt_good_scan(antcomb, div_ant_conf,
1608 antcomb->alt_good = true;
1610 antcomb->alt_good = false;
1614 antcomb->scan = true;
1615 antcomb->scan_not_start = true;
1618 if (!antcomb->scan) {
1619 if (ath_ant_div_comb_alt_check(div_ant_conf.div_group,
1620 alt_ratio, curr_main_set, curr_alt_set,
1621 alt_rssi_avg, main_rssi_avg)) {
1622 if (curr_alt_set == ATH_ANT_DIV_COMB_LNA2) {
1623 /* Switch main and alt LNA */
1624 div_ant_conf.main_lna_conf =
1625 ATH_ANT_DIV_COMB_LNA2;
1626 div_ant_conf.alt_lna_conf =
1627 ATH_ANT_DIV_COMB_LNA1;
1628 } else if (curr_alt_set == ATH_ANT_DIV_COMB_LNA1) {
1629 div_ant_conf.main_lna_conf =
1630 ATH_ANT_DIV_COMB_LNA1;
1631 div_ant_conf.alt_lna_conf =
1632 ATH_ANT_DIV_COMB_LNA2;
1636 } else if ((curr_alt_set != ATH_ANT_DIV_COMB_LNA1) &&
1637 (curr_alt_set != ATH_ANT_DIV_COMB_LNA2)) {
1638 /* Set alt to another LNA */
1639 if (curr_main_set == ATH_ANT_DIV_COMB_LNA2)
1640 div_ant_conf.alt_lna_conf =
1641 ATH_ANT_DIV_COMB_LNA1;
1642 else if (curr_main_set == ATH_ANT_DIV_COMB_LNA1)
1643 div_ant_conf.alt_lna_conf =
1644 ATH_ANT_DIV_COMB_LNA2;
1649 if ((alt_rssi_avg < (main_rssi_avg +
1650 div_ant_conf.lna1_lna2_delta)))
1654 if (!antcomb->scan_not_start) {
1655 switch (curr_alt_set) {
1656 case ATH_ANT_DIV_COMB_LNA2:
1657 antcomb->rssi_lna2 = alt_rssi_avg;
1658 antcomb->rssi_lna1 = main_rssi_avg;
1659 antcomb->scan = true;
1661 div_ant_conf.main_lna_conf =
1662 ATH_ANT_DIV_COMB_LNA1;
1663 div_ant_conf.alt_lna_conf =
1664 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
1666 case ATH_ANT_DIV_COMB_LNA1:
1667 antcomb->rssi_lna1 = alt_rssi_avg;
1668 antcomb->rssi_lna2 = main_rssi_avg;
1669 antcomb->scan = true;
1671 div_ant_conf.main_lna_conf = ATH_ANT_DIV_COMB_LNA2;
1672 div_ant_conf.alt_lna_conf =
1673 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
1675 case ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2:
1676 antcomb->rssi_add = alt_rssi_avg;
1677 antcomb->scan = true;
1679 div_ant_conf.alt_lna_conf =
1680 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
1682 case ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2:
1683 antcomb->rssi_sub = alt_rssi_avg;
1684 antcomb->scan = false;
1685 if (antcomb->rssi_lna2 >
1686 (antcomb->rssi_lna1 +
1687 ATH_ANT_DIV_COMB_LNA1_LNA2_SWITCH_DELTA)) {
1688 /* use LNA2 as main LNA */
1689 if ((antcomb->rssi_add > antcomb->rssi_lna1) &&
1690 (antcomb->rssi_add > antcomb->rssi_sub)) {
1692 div_ant_conf.main_lna_conf =
1693 ATH_ANT_DIV_COMB_LNA2;
1694 div_ant_conf.alt_lna_conf =
1695 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
1696 } else if (antcomb->rssi_sub >
1697 antcomb->rssi_lna1) {
1699 div_ant_conf.main_lna_conf =
1700 ATH_ANT_DIV_COMB_LNA2;
1701 div_ant_conf.alt_lna_conf =
1702 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
1705 div_ant_conf.main_lna_conf =
1706 ATH_ANT_DIV_COMB_LNA2;
1707 div_ant_conf.alt_lna_conf =
1708 ATH_ANT_DIV_COMB_LNA1;
1711 /* use LNA1 as main LNA */
1712 if ((antcomb->rssi_add > antcomb->rssi_lna2) &&
1713 (antcomb->rssi_add > antcomb->rssi_sub)) {
1715 div_ant_conf.main_lna_conf =
1716 ATH_ANT_DIV_COMB_LNA1;
1717 div_ant_conf.alt_lna_conf =
1718 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
1719 } else if (antcomb->rssi_sub >
1720 antcomb->rssi_lna1) {
1722 div_ant_conf.main_lna_conf =
1723 ATH_ANT_DIV_COMB_LNA1;
1724 div_ant_conf.alt_lna_conf =
1725 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
1728 div_ant_conf.main_lna_conf =
1729 ATH_ANT_DIV_COMB_LNA1;
1730 div_ant_conf.alt_lna_conf =
1731 ATH_ANT_DIV_COMB_LNA2;
1739 if (!antcomb->alt_good) {
1740 antcomb->scan_not_start = false;
1741 /* Set alt to another LNA */
1742 if (curr_main_set == ATH_ANT_DIV_COMB_LNA2) {
1743 div_ant_conf.main_lna_conf =
1744 ATH_ANT_DIV_COMB_LNA2;
1745 div_ant_conf.alt_lna_conf =
1746 ATH_ANT_DIV_COMB_LNA1;
1747 } else if (curr_main_set == ATH_ANT_DIV_COMB_LNA1) {
1748 div_ant_conf.main_lna_conf =
1749 ATH_ANT_DIV_COMB_LNA1;
1750 div_ant_conf.alt_lna_conf =
1751 ATH_ANT_DIV_COMB_LNA2;
1757 ath_select_ant_div_from_quick_scan(antcomb, &div_ant_conf,
1758 main_rssi_avg, alt_rssi_avg,
1761 antcomb->quick_scan_cnt++;
1764 ath_ant_div_conf_fast_divbias(&div_ant_conf, antcomb, alt_ratio);
1765 ath9k_hw_antdiv_comb_conf_set(sc->sc_ah, &div_ant_conf);
1767 antcomb->scan_start_time = jiffies;
1768 antcomb->total_pkt_count = 0;
1769 antcomb->main_total_rssi = 0;
1770 antcomb->alt_total_rssi = 0;
1771 antcomb->main_recv_cnt = 0;
1772 antcomb->alt_recv_cnt = 0;
1775 int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
1778 struct sk_buff *skb = NULL, *requeue_skb, *hdr_skb;
1779 struct ieee80211_rx_status *rxs;
1780 struct ath_hw *ah = sc->sc_ah;
1781 struct ath_common *common = ath9k_hw_common(ah);
1782 struct ieee80211_hw *hw = sc->hw;
1783 struct ieee80211_hdr *hdr;
1785 bool decrypt_error = false;
1786 struct ath_rx_status rs;
1787 enum ath9k_rx_qtype qtype;
1788 bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA);
1790 u8 rx_status_len = ah->caps.rx_status_len;
1793 unsigned long flags;
1796 dma_type = DMA_BIDIRECTIONAL;
1798 dma_type = DMA_FROM_DEVICE;
1800 qtype = hp ? ATH9K_RX_QUEUE_HP : ATH9K_RX_QUEUE_LP;
1801 spin_lock_bh(&sc->rx.rxbuflock);
1803 tsf = ath9k_hw_gettsf64(ah);
1804 tsf_lower = tsf & 0xffffffff;
1807 /* If handling rx interrupt and flush is in progress => exit */
1808 if ((sc->sc_flags & SC_OP_RXFLUSH) && (flush == 0))
1811 memset(&rs, 0, sizeof(rs));
1813 bf = ath_edma_get_next_rx_buf(sc, &rs, qtype);
1815 bf = ath_get_next_rx_buf(sc, &rs);
1825 * Take frame header from the first fragment and RX status from
1829 hdr_skb = sc->rx.frag;
1833 hdr = (struct ieee80211_hdr *) (hdr_skb->data + rx_status_len);
1834 rxs = IEEE80211_SKB_RXCB(hdr_skb);
1835 if (ieee80211_is_beacon(hdr->frame_control) &&
1836 !compare_ether_addr(hdr->addr3, common->curbssid))
1837 rs.is_mybeacon = true;
1839 rs.is_mybeacon = false;
1841 ath_debug_stat_rx(sc, &rs);
1844 * If we're asked to flush receive queue, directly
1845 * chain it back at the queue without processing it.
1847 if (sc->sc_flags & SC_OP_RXFLUSH)
1848 goto requeue_drop_frag;
1850 retval = ath9k_rx_skb_preprocess(common, hw, hdr, &rs,
1851 rxs, &decrypt_error);
1853 goto requeue_drop_frag;
1855 rxs->mactime = (tsf & ~0xffffffffULL) | rs.rs_tstamp;
1856 if (rs.rs_tstamp > tsf_lower &&
1857 unlikely(rs.rs_tstamp - tsf_lower > 0x10000000))
1858 rxs->mactime -= 0x100000000ULL;
1860 if (rs.rs_tstamp < tsf_lower &&
1861 unlikely(tsf_lower - rs.rs_tstamp > 0x10000000))
1862 rxs->mactime += 0x100000000ULL;
1864 /* Ensure we always have an skb to requeue once we are done
1865 * processing the current buffer's skb */
1866 requeue_skb = ath_rxbuf_alloc(common, common->rx_bufsize, GFP_ATOMIC);
1868 /* If there is no memory we ignore the current RX'd frame,
1869 * tell hardware it can give us a new frame using the old
1870 * skb and put it at the tail of the sc->rx.rxbuf list for
1873 goto requeue_drop_frag;
1875 /* Unmap the frame */
1876 dma_unmap_single(sc->dev, bf->bf_buf_addr,
1880 skb_put(skb, rs.rs_datalen + ah->caps.rx_status_len);
1881 if (ah->caps.rx_status_len)
1882 skb_pull(skb, ah->caps.rx_status_len);
1885 ath9k_rx_skb_postprocess(common, hdr_skb, &rs,
1886 rxs, decrypt_error);
1888 /* We will now give hardware our shiny new allocated skb */
1889 bf->bf_mpdu = requeue_skb;
1890 bf->bf_buf_addr = dma_map_single(sc->dev, requeue_skb->data,
1893 if (unlikely(dma_mapping_error(sc->dev,
1894 bf->bf_buf_addr))) {
1895 dev_kfree_skb_any(requeue_skb);
1897 bf->bf_buf_addr = 0;
1898 ath_err(common, "dma_mapping_error() on RX\n");
1899 ieee80211_rx(hw, skb);
1905 * rs_more indicates chained descriptors which can be
1906 * used to link buffers together for a sort of
1907 * scatter-gather operation.
1910 /* too many fragments - cannot handle frame */
1911 dev_kfree_skb_any(sc->rx.frag);
1912 dev_kfree_skb_any(skb);
1920 int space = skb->len - skb_tailroom(hdr_skb);
1924 if (pskb_expand_head(hdr_skb, 0, space, GFP_ATOMIC) < 0) {
1926 goto requeue_drop_frag;
1929 skb_copy_from_linear_data(skb, skb_put(hdr_skb, skb->len),
1931 dev_kfree_skb_any(skb);
1936 * change the default rx antenna if rx diversity chooses the
1937 * other antenna 3 times in a row.
1939 if (sc->rx.defant != rs.rs_antenna) {
1940 if (++sc->rx.rxotherant >= 3)
1941 ath_setdefantenna(sc, rs.rs_antenna);
1943 sc->rx.rxotherant = 0;
1946 if (rxs->flag & RX_FLAG_MMIC_STRIPPED)
1947 skb_trim(skb, skb->len - 8);
1949 spin_lock_irqsave(&sc->sc_pm_lock, flags);
1951 if ((sc->ps_flags & (PS_WAIT_FOR_BEACON |
1953 PS_WAIT_FOR_PSPOLL_DATA)) ||
1954 ath9k_check_auto_sleep(sc))
1955 ath_rx_ps(sc, skb, rs.is_mybeacon);
1956 spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
1958 if ((ah->caps.hw_caps & ATH9K_HW_CAP_ANT_DIV_COMB) && sc->ant_rx == 3)
1959 ath_ant_comb_scan(sc, &rs);
1961 ieee80211_rx(hw, skb);
1965 dev_kfree_skb_any(sc->rx.frag);
1970 list_add_tail(&bf->list, &sc->rx.rxbuf);
1971 ath_rx_edma_buf_link(sc, qtype);
1973 list_move_tail(&bf->list, &sc->rx.rxbuf);
1974 ath_rx_buf_link(sc, bf);
1980 spin_unlock_bh(&sc->rx.rxbuflock);
1982 if (!(ah->imask & ATH9K_INT_RXEOL)) {
1983 ah->imask |= (ATH9K_INT_RXEOL | ATH9K_INT_RXORN);
1984 ath9k_hw_set_interrupts(ah);