| /* |
| * Copyright (c) 2008-2011 Atheros Communications Inc. |
| * |
| * Permission to use, copy, modify, and/or distribute this software for any |
| * purpose with or without fee is hereby granted, provided that the above |
| * copyright notice and this permission notice appear in all copies. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| */ |
| |
| #include <linux/dma-mapping.h> |
| #include "ath9k.h" |
| #include "ar9003_mac.h" |
| |
| #define SKB_CB_ATHBUF(__skb) (*((struct ath_rxbuf **)__skb->cb)) |
| |
| static inline bool ath9k_check_auto_sleep(struct ath_softc *sc) |
| { |
| return sc->ps_enabled && |
| (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_AUTOSLEEP); |
| } |
| |
| /* |
| * Setup and link descriptors. |
| * |
| * 11N: we can no longer afford to self link the last descriptor. |
| * MAC acknowledges BA status as long as it copies frames to host |
| * buffer (or rx fifo). This can incorrectly acknowledge packets |
| * to a sender if last desc is self-linked. |
| */ |
| static void ath_rx_buf_link(struct ath_softc *sc, struct ath_rxbuf *bf, |
| bool flush) |
| { |
| struct ath_hw *ah = sc->sc_ah; |
| struct ath_common *common = ath9k_hw_common(ah); |
| struct ath_desc *ds; |
| struct sk_buff *skb; |
| |
| ds = bf->bf_desc; |
| ds->ds_link = 0; /* link to null */ |
| ds->ds_data = bf->bf_buf_addr; |
| |
| /* virtual addr of the beginning of the buffer. */ |
| skb = bf->bf_mpdu; |
| BUG_ON(skb == NULL); |
| ds->ds_vdata = skb->data; |
| |
| /* |
| * setup rx descriptors. The rx_bufsize here tells the hardware |
| * how much data it can DMA to us and that we are prepared |
| * to process |
| */ |
| ath9k_hw_setuprxdesc(ah, ds, |
| common->rx_bufsize, |
| 0); |
| |
| if (sc->rx.rxlink) |
| *sc->rx.rxlink = bf->bf_daddr; |
| else if (!flush) |
| ath9k_hw_putrxbuf(ah, bf->bf_daddr); |
| |
| sc->rx.rxlink = &ds->ds_link; |
| } |
| |
| static void ath_rx_buf_relink(struct ath_softc *sc, struct ath_rxbuf *bf, |
| bool flush) |
| { |
| if (sc->rx.buf_hold) |
| ath_rx_buf_link(sc, sc->rx.buf_hold, flush); |
| |
| sc->rx.buf_hold = bf; |
| } |
| |
| static void ath_setdefantenna(struct ath_softc *sc, u32 antenna) |
| { |
| /* XXX block beacon interrupts */ |
| ath9k_hw_setantenna(sc->sc_ah, antenna); |
| sc->rx.defant = antenna; |
| sc->rx.rxotherant = 0; |
| } |
| |
| static void ath_opmode_init(struct ath_softc *sc) |
| { |
| struct ath_hw *ah = sc->sc_ah; |
| struct ath_common *common = ath9k_hw_common(ah); |
| |
| u32 rfilt, mfilt[2]; |
| |
| /* configure rx filter */ |
| rfilt = ath_calcrxfilter(sc); |
| ath9k_hw_setrxfilter(ah, rfilt); |
| |
| /* configure bssid mask */ |
| ath_hw_setbssidmask(common); |
| |
| /* configure operational mode */ |
| ath9k_hw_setopmode(ah); |
| |
| /* calculate and install multicast filter */ |
| mfilt[0] = mfilt[1] = ~0; |
| ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]); |
| } |
| |
| static bool ath_rx_edma_buf_link(struct ath_softc *sc, |
| enum ath9k_rx_qtype qtype) |
| { |
| struct ath_hw *ah = sc->sc_ah; |
| struct ath_rx_edma *rx_edma; |
| struct sk_buff *skb; |
| struct ath_rxbuf *bf; |
| |
| rx_edma = &sc->rx.rx_edma[qtype]; |
| if (skb_queue_len(&rx_edma->rx_fifo) >= rx_edma->rx_fifo_hwsize) |
| return false; |
| |
| bf = list_first_entry(&sc->rx.rxbuf, struct ath_rxbuf, list); |
| list_del_init(&bf->list); |
| |
| skb = bf->bf_mpdu; |
| |
| memset(skb->data, 0, ah->caps.rx_status_len); |
| dma_sync_single_for_device(sc->dev, bf->bf_buf_addr, |
| ah->caps.rx_status_len, DMA_TO_DEVICE); |
| |
| SKB_CB_ATHBUF(skb) = bf; |
| ath9k_hw_addrxbuf_edma(ah, bf->bf_buf_addr, qtype); |
| __skb_queue_tail(&rx_edma->rx_fifo, skb); |
| |
| return true; |
| } |
| |
| static void ath_rx_addbuffer_edma(struct ath_softc *sc, |
| enum ath9k_rx_qtype qtype) |
| { |
| struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
| struct ath_rxbuf *bf, *tbf; |
| |
| if (list_empty(&sc->rx.rxbuf)) { |
| ath_dbg(common, QUEUE, "No free rx buf available\n"); |
| return; |
| } |
| |
| list_for_each_entry_safe(bf, tbf, &sc->rx.rxbuf, list) |
| if (!ath_rx_edma_buf_link(sc, qtype)) |
| break; |
| |
| } |
| |
| static void ath_rx_remove_buffer(struct ath_softc *sc, |
| enum ath9k_rx_qtype qtype) |
| { |
| struct ath_rxbuf *bf; |
| struct ath_rx_edma *rx_edma; |
| struct sk_buff *skb; |
| |
| rx_edma = &sc->rx.rx_edma[qtype]; |
| |
| while ((skb = __skb_dequeue(&rx_edma->rx_fifo)) != NULL) { |
| bf = SKB_CB_ATHBUF(skb); |
| BUG_ON(!bf); |
| list_add_tail(&bf->list, &sc->rx.rxbuf); |
| } |
| } |
| |
| static void ath_rx_edma_cleanup(struct ath_softc *sc) |
| { |
| struct ath_hw *ah = sc->sc_ah; |
| struct ath_common *common = ath9k_hw_common(ah); |
| struct ath_rxbuf *bf; |
| |
| ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_LP); |
| ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_HP); |
| |
| list_for_each_entry(bf, &sc->rx.rxbuf, list) { |
| if (bf->bf_mpdu) { |
| dma_unmap_single(sc->dev, bf->bf_buf_addr, |
| common->rx_bufsize, |
| DMA_BIDIRECTIONAL); |
| dev_kfree_skb_any(bf->bf_mpdu); |
| bf->bf_buf_addr = 0; |
| bf->bf_mpdu = NULL; |
| } |
| } |
| } |
| |
| static void ath_rx_edma_init_queue(struct ath_rx_edma *rx_edma, int size) |
| { |
| __skb_queue_head_init(&rx_edma->rx_fifo); |
| rx_edma->rx_fifo_hwsize = size; |
| } |
| |
| static int ath_rx_edma_init(struct ath_softc *sc, int nbufs) |
| { |
| struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
| struct ath_hw *ah = sc->sc_ah; |
| struct sk_buff *skb; |
| struct ath_rxbuf *bf; |
| int error = 0, i; |
| u32 size; |
| |
| ath9k_hw_set_rx_bufsize(ah, common->rx_bufsize - |
| ah->caps.rx_status_len); |
| |
| ath_rx_edma_init_queue(&sc->rx.rx_edma[ATH9K_RX_QUEUE_LP], |
| ah->caps.rx_lp_qdepth); |
| ath_rx_edma_init_queue(&sc->rx.rx_edma[ATH9K_RX_QUEUE_HP], |
| ah->caps.rx_hp_qdepth); |
| |
| size = sizeof(struct ath_rxbuf) * nbufs; |
| bf = devm_kzalloc(sc->dev, size, GFP_KERNEL); |
| if (!bf) |
| return -ENOMEM; |
| |
| INIT_LIST_HEAD(&sc->rx.rxbuf); |
| |
| for (i = 0; i < nbufs; i++, bf++) { |
| skb = ath_rxbuf_alloc(common, common->rx_bufsize, GFP_KERNEL); |
| if (!skb) { |
| error = -ENOMEM; |
| goto rx_init_fail; |
| } |
| |
| memset(skb->data, 0, common->rx_bufsize); |
| bf->bf_mpdu = skb; |
| |
| bf->bf_buf_addr = dma_map_single(sc->dev, skb->data, |
| common->rx_bufsize, |
| DMA_BIDIRECTIONAL); |
| if (unlikely(dma_mapping_error(sc->dev, |
| bf->bf_buf_addr))) { |
| dev_kfree_skb_any(skb); |
| bf->bf_mpdu = NULL; |
| bf->bf_buf_addr = 0; |
| ath_err(common, |
| "dma_mapping_error() on RX init\n"); |
| error = -ENOMEM; |
| goto rx_init_fail; |
| } |
| |
| list_add_tail(&bf->list, &sc->rx.rxbuf); |
| } |
| |
| return 0; |
| |
| rx_init_fail: |
| ath_rx_edma_cleanup(sc); |
| return error; |
| } |
| |
| static void ath_edma_start_recv(struct ath_softc *sc) |
| { |
| ath9k_hw_rxena(sc->sc_ah); |
| ath_rx_addbuffer_edma(sc, ATH9K_RX_QUEUE_HP); |
| ath_rx_addbuffer_edma(sc, ATH9K_RX_QUEUE_LP); |
| ath_opmode_init(sc); |
| ath9k_hw_startpcureceive(sc->sc_ah, sc->cur_chan->offchannel); |
| } |
| |
| static void ath_edma_stop_recv(struct ath_softc *sc) |
| { |
| ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_HP); |
| ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_LP); |
| } |
| |
| int ath_rx_init(struct ath_softc *sc, int nbufs) |
| { |
| struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
| struct sk_buff *skb; |
| struct ath_rxbuf *bf; |
| int error = 0; |
| |
| spin_lock_init(&sc->sc_pcu_lock); |
| |
| common->rx_bufsize = IEEE80211_MAX_MPDU_LEN / 2 + |
| sc->sc_ah->caps.rx_status_len; |
| |
| if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) |
| return ath_rx_edma_init(sc, nbufs); |
| |
| ath_dbg(common, CONFIG, "cachelsz %u rxbufsize %u\n", |
| common->cachelsz, common->rx_bufsize); |
| |
| /* Initialize rx descriptors */ |
| |
| error = ath_descdma_setup(sc, &sc->rx.rxdma, &sc->rx.rxbuf, |
| "rx", nbufs, 1, 0); |
| if (error != 0) { |
| ath_err(common, |
| "failed to allocate rx descriptors: %d\n", |
| error); |
| goto err; |
| } |
| |
| list_for_each_entry(bf, &sc->rx.rxbuf, list) { |
| skb = ath_rxbuf_alloc(common, common->rx_bufsize, |
| GFP_KERNEL); |
| if (skb == NULL) { |
| error = -ENOMEM; |
| goto err; |
| } |
| |
| bf->bf_mpdu = skb; |
| bf->bf_buf_addr = dma_map_single(sc->dev, skb->data, |
| common->rx_bufsize, |
| DMA_FROM_DEVICE); |
| if (unlikely(dma_mapping_error(sc->dev, |
| bf->bf_buf_addr))) { |
| dev_kfree_skb_any(skb); |
| bf->bf_mpdu = NULL; |
| bf->bf_buf_addr = 0; |
| ath_err(common, |
| "dma_mapping_error() on RX init\n"); |
| error = -ENOMEM; |
| goto err; |
| } |
| } |
| sc->rx.rxlink = NULL; |
| err: |
| if (error) |
| ath_rx_cleanup(sc); |
| |
| return error; |
| } |
| |
| void ath_rx_cleanup(struct ath_softc *sc) |
| { |
| struct ath_hw *ah = sc->sc_ah; |
| struct ath_common *common = ath9k_hw_common(ah); |
| struct sk_buff *skb; |
| struct ath_rxbuf *bf; |
| |
| if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) { |
| ath_rx_edma_cleanup(sc); |
| return; |
| } |
| |
| list_for_each_entry(bf, &sc->rx.rxbuf, list) { |
| skb = bf->bf_mpdu; |
| if (skb) { |
| dma_unmap_single(sc->dev, bf->bf_buf_addr, |
| common->rx_bufsize, |
| DMA_FROM_DEVICE); |
| dev_kfree_skb(skb); |
| bf->bf_buf_addr = 0; |
| bf->bf_mpdu = NULL; |
| } |
| } |
| } |
| |
| /* |
| * Calculate the receive filter according to the |
| * operating mode and state: |
| * |
| * o always accept unicast, broadcast, and multicast traffic |
| * o maintain current state of phy error reception (the hal |
| * may enable phy error frames for noise immunity work) |
| * o probe request frames are accepted only when operating in |
| * hostap, adhoc, or monitor modes |
| * o enable promiscuous mode according to the interface state |
| * o accept beacons: |
| * - when operating in adhoc mode so the 802.11 layer creates |
| * node table entries for peers, |
| * - when operating in station mode for collecting rssi data when |
| * the station is otherwise quiet, or |
| * - when operating as a repeater so we see repeater-sta beacons |
| * - when scanning |
| */ |
| |
| u32 ath_calcrxfilter(struct ath_softc *sc) |
| { |
| struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
| u32 rfilt; |
| |
| if (config_enabled(CPTCFG_ATH9K_TX99)) |
| return 0; |
| |
| rfilt = ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST |
| | ATH9K_RX_FILTER_MCAST; |
| |
| /* if operating on a DFS channel, enable radar pulse detection */ |
| if (sc->hw->conf.radar_enabled) |
| rfilt |= ATH9K_RX_FILTER_PHYRADAR | ATH9K_RX_FILTER_PHYERR; |
| |
| spin_lock_bh(&sc->chan_lock); |
| |
| if (sc->cur_chan->rxfilter & FIF_PROBE_REQ) |
| rfilt |= ATH9K_RX_FILTER_PROBEREQ; |
| |
| if (sc->sc_ah->is_monitoring) |
| rfilt |= ATH9K_RX_FILTER_PROM; |
| |
| if ((sc->cur_chan->rxfilter & FIF_CONTROL) || |
| sc->sc_ah->dynack.enabled) |
| rfilt |= ATH9K_RX_FILTER_CONTROL; |
| |
| if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) && |
| (sc->cur_chan->nvifs <= 1) && |
| !(sc->cur_chan->rxfilter & FIF_BCN_PRBRESP_PROMISC)) |
| rfilt |= ATH9K_RX_FILTER_MYBEACON; |
| else if (sc->sc_ah->opmode != NL80211_IFTYPE_OCB) |
| rfilt |= ATH9K_RX_FILTER_BEACON; |
| |
| if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) || |
| (sc->cur_chan->rxfilter & FIF_PSPOLL)) |
| rfilt |= ATH9K_RX_FILTER_PSPOLL; |
| |
| if (sc->cur_chandef.width != NL80211_CHAN_WIDTH_20_NOHT) |
| rfilt |= ATH9K_RX_FILTER_COMP_BAR; |
| |
| if (sc->cur_chan->nvifs > 1 || (sc->cur_chan->rxfilter & FIF_OTHER_BSS)) { |
| /* This is needed for older chips */ |
| if (sc->sc_ah->hw_version.macVersion <= AR_SREV_VERSION_9160) |
| rfilt |= ATH9K_RX_FILTER_PROM; |
| rfilt |= ATH9K_RX_FILTER_MCAST_BCAST_ALL; |
| } |
| |
| if (AR_SREV_9550(sc->sc_ah) || AR_SREV_9531(sc->sc_ah) || |
| AR_SREV_9561(sc->sc_ah)) |
| rfilt |= ATH9K_RX_FILTER_4ADDRESS; |
| |
| if (AR_SREV_9462(sc->sc_ah) || AR_SREV_9565(sc->sc_ah)) |
| rfilt |= ATH9K_RX_FILTER_CONTROL_WRAPPER; |
| |
| if (ath9k_is_chanctx_enabled() && |
| test_bit(ATH_OP_SCANNING, &common->op_flags)) |
| rfilt |= ATH9K_RX_FILTER_BEACON; |
| |
| spin_unlock_bh(&sc->chan_lock); |
| |
| return rfilt; |
| |
| } |
| |
| void ath_startrecv(struct ath_softc *sc) |
| { |
| struct ath_hw *ah = sc->sc_ah; |
| struct ath_rxbuf *bf, *tbf; |
| |
| if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) { |
| ath_edma_start_recv(sc); |
| return; |
| } |
| |
| if (list_empty(&sc->rx.rxbuf)) |
| goto start_recv; |
| |
| sc->rx.buf_hold = NULL; |
| sc->rx.rxlink = NULL; |
| list_for_each_entry_safe(bf, tbf, &sc->rx.rxbuf, list) { |
| ath_rx_buf_link(sc, bf, false); |
| } |
| |
| /* We could have deleted elements so the list may be empty now */ |
| if (list_empty(&sc->rx.rxbuf)) |
| goto start_recv; |
| |
| bf = list_first_entry(&sc->rx.rxbuf, struct ath_rxbuf, list); |
| ath9k_hw_putrxbuf(ah, bf->bf_daddr); |
| ath9k_hw_rxena(ah); |
| |
| start_recv: |
| ath_opmode_init(sc); |
| ath9k_hw_startpcureceive(ah, sc->cur_chan->offchannel); |
| } |
| |
| static void ath_flushrecv(struct ath_softc *sc) |
| { |
| if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) |
| ath_rx_tasklet(sc, 1, true); |
| ath_rx_tasklet(sc, 1, false); |
| } |
| |
| bool ath_stoprecv(struct ath_softc *sc) |
| { |
| struct ath_hw *ah = sc->sc_ah; |
| bool stopped, reset = false; |
| |
| ath9k_hw_abortpcurecv(ah); |
| ath9k_hw_setrxfilter(ah, 0); |
| stopped = ath9k_hw_stopdmarecv(ah, &reset); |
| |
| ath_flushrecv(sc); |
| |
| if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) |
| ath_edma_stop_recv(sc); |
| else |
| sc->rx.rxlink = NULL; |
| |
| if (!(ah->ah_flags & AH_UNPLUGGED) && |
| unlikely(!stopped)) { |
| ath_dbg(ath9k_hw_common(sc->sc_ah), RESET, |
| "Failed to stop Rx DMA\n"); |
| RESET_STAT_INC(sc, RESET_RX_DMA_ERROR); |
| } |
| return stopped && !reset; |
| } |
| |
| static bool ath_beacon_dtim_pending_cab(struct sk_buff *skb) |
| { |
| /* Check whether the Beacon frame has DTIM indicating buffered bc/mc */ |
| struct ieee80211_mgmt *mgmt; |
| u8 *pos, *end, id, elen; |
| struct ieee80211_tim_ie *tim; |
| |
| mgmt = (struct ieee80211_mgmt *)skb->data; |
| pos = mgmt->u.beacon.variable; |
| end = skb->data + skb->len; |
| |
| while (pos + 2 < end) { |
| id = *pos++; |
| elen = *pos++; |
| if (pos + elen > end) |
| break; |
| |
| if (id == WLAN_EID_TIM) { |
| if (elen < sizeof(*tim)) |
| break; |
| tim = (struct ieee80211_tim_ie *) pos; |
| if (tim->dtim_count != 0) |
| break; |
| return tim->bitmap_ctrl & 0x01; |
| } |
| |
| pos += elen; |
| } |
| |
| return false; |
| } |
| |
| static void ath_rx_ps_beacon(struct ath_softc *sc, struct sk_buff *skb) |
| { |
| struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
| bool skip_beacon = false; |
| |
| if (skb->len < 24 + 8 + 2 + 2) |
| return; |
| |
| sc->ps_flags &= ~PS_WAIT_FOR_BEACON; |
| |
| if (sc->ps_flags & PS_BEACON_SYNC) { |
| sc->ps_flags &= ~PS_BEACON_SYNC; |
| ath_dbg(common, PS, |
| "Reconfigure beacon timers based on synchronized timestamp\n"); |
| |
| #ifdef CPTCFG_ATH9K_CHANNEL_CONTEXT |
| if (ath9k_is_chanctx_enabled()) { |
| if (sc->cur_chan == &sc->offchannel.chan) |
| skip_beacon = true; |
| } |
| #endif |
| |
| if (!skip_beacon && |
| !(WARN_ON_ONCE(sc->cur_chan->beacon.beacon_interval == 0))) |
| ath9k_set_beacon(sc); |
| |
| ath9k_p2p_beacon_sync(sc); |
| } |
| |
| if (ath_beacon_dtim_pending_cab(skb)) { |
| /* |
| * Remain awake waiting for buffered broadcast/multicast |
| * frames. If the last broadcast/multicast frame is not |
| * received properly, the next beacon frame will work as |
| * a backup trigger for returning into NETWORK SLEEP state, |
| * so we are waiting for it as well. |
| */ |
| ath_dbg(common, PS, |
| "Received DTIM beacon indicating buffered broadcast/multicast frame(s)\n"); |
| sc->ps_flags |= PS_WAIT_FOR_CAB | PS_WAIT_FOR_BEACON; |
| return; |
| } |
| |
| if (sc->ps_flags & PS_WAIT_FOR_CAB) { |
| /* |
| * This can happen if a broadcast frame is dropped or the AP |
| * fails to send a frame indicating that all CAB frames have |
| * been delivered. |
| */ |
| sc->ps_flags &= ~PS_WAIT_FOR_CAB; |
| ath_dbg(common, PS, "PS wait for CAB frames timed out\n"); |
| } |
| } |
| |
| static void ath_rx_ps(struct ath_softc *sc, struct sk_buff *skb, bool mybeacon) |
| { |
| struct ieee80211_hdr *hdr; |
| struct ath_common *common = ath9k_hw_common(sc->sc_ah); |
| |
| hdr = (struct ieee80211_hdr *)skb->data; |
| |
| /* Process Beacon and CAB receive in PS state */ |
| if (((sc->ps_flags & PS_WAIT_FOR_BEACON) || ath9k_check_auto_sleep(sc)) |
| && mybeacon) { |
| ath_rx_ps_beacon(sc, skb); |
| } else if ((sc->ps_flags & PS_WAIT_FOR_CAB) && |
| (ieee80211_is_data(hdr->frame_control) || |
| ieee80211_is_action(hdr->frame_control)) && |
| is_multicast_ether_addr(hdr->addr1) && |
| !ieee80211_has_moredata(hdr->frame_control)) { |
| /* |
| * No more broadcast/multicast frames to be received at this |
| * point. |
| */ |
| sc->ps_flags &= ~(PS_WAIT_FOR_CAB | PS_WAIT_FOR_BEACON); |
| ath_dbg(common, PS, |
| "All PS CAB frames received, back to sleep\n"); |
| } else if ((sc->ps_flags & PS_WAIT_FOR_PSPOLL_DATA) && |
| !is_multicast_ether_addr(hdr->addr1) && |
| !ieee80211_has_morefrags(hdr->frame_control)) { |
| sc->ps_flags &= ~PS_WAIT_FOR_PSPOLL_DATA; |
| ath_dbg(common, PS, |
| "Going back to sleep after having received PS-Poll data (0x%lx)\n", |
| sc->ps_flags & (PS_WAIT_FOR_BEACON | |
| PS_WAIT_FOR_CAB | |
| PS_WAIT_FOR_PSPOLL_DATA | |
| PS_WAIT_FOR_TX_ACK)); |
| } |
| } |
| |
| static bool ath_edma_get_buffers(struct ath_softc *sc, |
| enum ath9k_rx_qtype qtype, |
| struct ath_rx_status *rs, |
| struct ath_rxbuf **dest) |
| { |
| struct ath_rx_edma *rx_edma = &sc->rx.rx_edma[qtype]; |
| struct ath_hw *ah = sc->sc_ah; |
| struct ath_common *common = ath9k_hw_common(ah); |
| struct sk_buff *skb; |
| struct ath_rxbuf *bf; |
| int ret; |
| |
| skb = skb_peek(&rx_edma->rx_fifo); |
| if (!skb) |
| return false; |
| |
| bf = SKB_CB_ATHBUF(skb); |
| BUG_ON(!bf); |
| |
| dma_sync_single_for_cpu(sc->dev, bf->bf_buf_addr, |
| common->rx_bufsize, DMA_FROM_DEVICE); |
| |
| ret = ath9k_hw_process_rxdesc_edma(ah, rs, skb->data); |
| if (ret == -EINPROGRESS) { |
| /*let device gain the buffer again*/ |
| dma_sync_single_for_device(sc->dev, bf->bf_buf_addr, |
| common->rx_bufsize, DMA_FROM_DEVICE); |
| return false; |
| } |
| |
| __skb_unlink(skb, &rx_edma->rx_fifo); |
| if (ret == -EINVAL) { |
| /* corrupt descriptor, skip this one and the following one */ |
| list_add_tail(&bf->list, &sc->rx.rxbuf); |
| ath_rx_edma_buf_link(sc, qtype); |
| |
| skb = skb_peek(&rx_edma->rx_fifo); |
| if (skb) { |
| bf = SKB_CB_ATHBUF(skb); |
| BUG_ON(!bf); |
| |
| __skb_unlink(skb, &rx_edma->rx_fifo); |
| list_add_tail(&bf->list, &sc->rx.rxbuf); |
| ath_rx_edma_buf_link(sc, qtype); |
| } |
| |
| bf = NULL; |
| } |
| |
| *dest = bf; |
| return true; |
| } |
| |
| static struct ath_rxbuf *ath_edma_get_next_rx_buf(struct ath_softc *sc, |
| struct ath_rx_status *rs, |
| enum ath9k_rx_qtype qtype) |
| { |
| struct ath_rxbuf *bf = NULL; |
| |
| while (ath_edma_get_buffers(sc, qtype, rs, &bf)) { |
| if (!bf) |
| continue; |
| |
| return bf; |
| } |
| return NULL; |
| } |
| |
| static struct ath_rxbuf *ath_get_next_rx_buf(struct ath_softc *sc, |
| struct ath_rx_status *rs) |
| { |
| struct ath_hw *ah = sc->sc_ah; |
| struct ath_common *common = ath9k_hw_common(ah); |
| struct ath_desc *ds; |
| struct ath_rxbuf *bf; |
| int ret; |
| |
| if (list_empty(&sc->rx.rxbuf)) { |
| sc->rx.rxlink = NULL; |
| return NULL; |
| } |
| |
| bf = list_first_entry(&sc->rx.rxbuf, struct ath_rxbuf, list); |
| if (bf == sc->rx.buf_hold) |
| return NULL; |
| |
| ds = bf->bf_desc; |
| |
| /* |
| * Must provide the virtual address of the current |
| * descriptor, the physical address, and the virtual |
| * address of the next descriptor in the h/w chain. |
| * This allows the HAL to look ahead to see if the |
| * hardware is done with a descriptor by checking the |
| * done bit in the following descriptor and the address |
| * of the current descriptor the DMA engine is working |
| * on. All this is necessary because of our use of |
| * a self-linked list to avoid rx overruns. |
| */ |
| ret = ath9k_hw_rxprocdesc(ah, ds, rs); |
| if (ret == -EINPROGRESS) { |
| struct ath_rx_status trs; |
| struct ath_rxbuf *tbf; |
| struct ath_desc *tds; |
| |
| memset(&trs, 0, sizeof(trs)); |
| if (list_is_last(&bf->list, &sc->rx.rxbuf)) { |
| sc->rx.rxlink = NULL; |
| return NULL; |
| } |
| |
| tbf = list_entry(bf->list.next, struct ath_rxbuf, list); |
| |
| /* |
| * On some hardware the descriptor status words could |
| * get corrupted, including the done bit. Because of |
| * this, check if the next descriptor's done bit is |
| * set or not. |
| * |
| * If the next descriptor's done bit is set, the current |
| * descriptor has been corrupted. Force s/w to discard |
| * this descriptor and continue... |
| */ |
| |
| tds = tbf->bf_desc; |
| ret = ath9k_hw_rxprocdesc(ah, tds, &trs); |
| if (ret == -EINPROGRESS) |
| return NULL; |
| |
| /* |
| * Re-check previous descriptor, in case it has been filled |
| * in the mean time. |
| */ |
| ret = ath9k_hw_rxprocdesc(ah, ds, rs); |
| if (ret == -EINPROGRESS) { |
| /* |
| * mark descriptor as zero-length and set the 'more' |
| * flag to ensure that both buffers get discarded |
| */ |
| rs->rs_datalen = 0; |
| rs->rs_more = true; |
| } |
| } |
| |
| list_del(&bf->list); |
| if (!bf->bf_mpdu) |
| return bf; |
| |
| /* |
| * Synchronize the DMA transfer with CPU before |
| * 1. accessing the frame |
| * 2. requeueing the same buffer to h/w |
| */ |
| dma_sync_single_for_cpu(sc->dev, bf->bf_buf_addr, |
| common->rx_bufsize, |
| DMA_FROM_DEVICE); |
| |
| return bf; |
| } |
| |
| static void ath9k_process_tsf(struct ath_rx_status *rs, |
| struct ieee80211_rx_status *rxs, |
| u64 tsf) |
| { |
| u32 tsf_lower = tsf & 0xffffffff; |
| |
| rxs->mactime = (tsf & ~0xffffffffULL) | rs->rs_tstamp; |
| if (rs->rs_tstamp > tsf_lower && |
| unlikely(rs->rs_tstamp - tsf_lower > 0x10000000)) |
| rxs->mactime -= 0x100000000ULL; |
| |
| if (rs->rs_tstamp < tsf_lower && |
| unlikely(tsf_lower - rs->rs_tstamp > 0x10000000)) |
| rxs->mactime += 0x100000000ULL; |
| } |
| |
| /* |
| * For Decrypt or Demic errors, we only mark packet status here and always push |
| * up the frame up to let mac80211 handle the actual error case, be it no |
| * decryption key or real decryption error. This let us keep statistics there. |
| */ |
| static int ath9k_rx_skb_preprocess(struct ath_softc *sc, |
| struct sk_buff *skb, |
| struct ath_rx_status *rx_stats, |
| struct ieee80211_rx_status *rx_status, |
| bool *decrypt_error, u64 tsf) |
| { |
| struct ieee80211_hw *hw = sc->hw; |
| struct ath_hw *ah = sc->sc_ah; |
| struct ath_common *common = ath9k_hw_common(ah); |
| struct ieee80211_hdr *hdr; |
| bool discard_current = sc->rx.discard_next; |
| |
| /* |
| * Discard corrupt descriptors which are marked in |
| * ath_get_next_rx_buf(). |
| */ |
| if (discard_current) |
| goto corrupt; |
| |
| sc->rx.discard_next = false; |
| |
| /* |
| * Discard zero-length packets. |
| */ |
| if (!rx_stats->rs_datalen) { |
| RX_STAT_INC(rx_len_err); |
| goto corrupt; |
| } |
| |
| /* |
| * rs_status follows rs_datalen so if rs_datalen is too large |
| * we can take a hint that hardware corrupted it, so ignore |
| * those frames. |
| */ |
| if (rx_stats->rs_datalen > (common->rx_bufsize - ah->caps.rx_status_len)) { |
| RX_STAT_INC(rx_len_err); |
| goto corrupt; |
| } |
| |
| /* Only use status info from the last fragment */ |
| if (rx_stats->rs_more) |
| return 0; |
| |
| /* |
| * Return immediately if the RX descriptor has been marked |
| * as corrupt based on the various error bits. |
| * |
| * This is different from the other corrupt descriptor |
| * condition handled above. |
| */ |
| if (rx_stats->rs_status & ATH9K_RXERR_CORRUPT_DESC) |
| goto corrupt; |
| |
| hdr = (struct ieee80211_hdr *) (skb->data + ah->caps.rx_status_len); |
| |
| ath9k_process_tsf(rx_stats, rx_status, tsf); |
| ath_debug_stat_rx(sc, rx_stats); |
| |
| /* |
| * Process PHY errors and return so that the packet |
| * can be dropped. |
| */ |
| if (rx_stats->rs_status & ATH9K_RXERR_PHY) { |
| ath9k_dfs_process_phyerr(sc, hdr, rx_stats, rx_status->mactime); |
| if (ath_cmn_process_fft(&sc->spec_priv, hdr, rx_stats, rx_status->mactime)) |
| RX_STAT_INC(rx_spectral); |
| |
| return -EINVAL; |
| } |
| |
| /* |
| * everything but the rate is checked here, the rate check is done |
| * separately to avoid doing two lookups for a rate for each frame. |
| */ |
| spin_lock_bh(&sc->chan_lock); |
| if (!ath9k_cmn_rx_accept(common, hdr, rx_status, rx_stats, decrypt_error, |
| sc->cur_chan->rxfilter)) { |
| spin_unlock_bh(&sc->chan_lock); |
| return -EINVAL; |
| } |
| spin_unlock_bh(&sc->chan_lock); |
| |
| if (ath_is_mybeacon(common, hdr)) { |
| RX_STAT_INC(rx_beacons); |
| rx_stats->is_mybeacon = true; |
| } |
| |
| /* |
| * This shouldn't happen, but have a safety check anyway. |
| */ |
| if (WARN_ON(!ah->curchan)) |
| return -EINVAL; |
| |
| if (ath9k_cmn_process_rate(common, hw, rx_stats, rx_status)) { |
| /* |
| * No valid hardware bitrate found -- we should not get here |
| * because hardware has already validated this frame as OK. |
| */ |
| ath_dbg(common, ANY, "unsupported hw bitrate detected 0x%02x using 1 Mbit\n", |
| rx_stats->rs_rate); |
| RX_STAT_INC(rx_rate_err); |
| return -EINVAL; |
| } |
| |
| if (ath9k_is_chanctx_enabled()) { |
| if (rx_stats->is_mybeacon) |
| ath_chanctx_beacon_recv_ev(sc, |
| ATH_CHANCTX_EVENT_BEACON_RECEIVED); |
| } |
| |
| ath9k_cmn_process_rssi(common, hw, rx_stats, rx_status); |
| |
| rx_status->band = ah->curchan->chan->band; |
| rx_status->freq = ah->curchan->chan->center_freq; |
| rx_status->antenna = rx_stats->rs_antenna; |
| rx_status->flag |= RX_FLAG_MACTIME_END; |
| |
| #ifdef CPTCFG_ATH9K_BTCOEX_SUPPORT |
| if (ieee80211_is_data_present(hdr->frame_control) && |
| !ieee80211_is_qos_nullfunc(hdr->frame_control)) |
| sc->rx.num_pkts++; |
| #endif |
| |
| return 0; |
| |
| corrupt: |
| sc->rx.discard_next = rx_stats->rs_more; |
| return -EINVAL; |
| } |
| |
| /* |
| * Run the LNA combining algorithm only in these cases: |
| * |
| * Standalone WLAN cards with both LNA/Antenna diversity |
| * enabled in the EEPROM. |
| * |
| * WLAN+BT cards which are in the supported card list |
| * in ath_pci_id_table and the user has loaded the |
| * driver with "bt_ant_diversity" set to true. |
| */ |
| static void ath9k_antenna_check(struct ath_softc *sc, |
| struct ath_rx_status *rs) |
| { |
| struct ath_hw *ah = sc->sc_ah; |
| struct ath9k_hw_capabilities *pCap = &ah->caps; |
| struct ath_common *common = ath9k_hw_common(ah); |
| |
| if (!(ah->caps.hw_caps & ATH9K_HW_CAP_ANT_DIV_COMB)) |
| return; |
| |
| /* |
| * Change the default rx antenna if rx diversity |
| * chooses the other antenna 3 times in a row. |
| */ |
| if (sc->rx.defant != rs->rs_antenna) { |
| if (++sc->rx.rxotherant >= 3) |
| ath_setdefantenna(sc, rs->rs_antenna); |
| } else { |
| sc->rx.rxotherant = 0; |
| } |
| |
| if (pCap->hw_caps & ATH9K_HW_CAP_BT_ANT_DIV) { |
| if (common->bt_ant_diversity) |
| ath_ant_comb_scan(sc, rs); |
| } else { |
| ath_ant_comb_scan(sc, rs); |
| } |
| } |
| |
| static void ath9k_apply_ampdu_details(struct ath_softc *sc, |
| struct ath_rx_status *rs, struct ieee80211_rx_status *rxs) |
| { |
| if (rs->rs_isaggr) { |
| rxs->flag |= RX_FLAG_AMPDU_DETAILS | RX_FLAG_AMPDU_LAST_KNOWN; |
| |
| rxs->ampdu_reference = sc->rx.ampdu_ref; |
| |
| if (!rs->rs_moreaggr) { |
| rxs->flag |= RX_FLAG_AMPDU_IS_LAST; |
| sc->rx.ampdu_ref++; |
| } |
| |
| if (rs->rs_flags & ATH9K_RX_DELIM_CRC_PRE) |
| rxs->flag |= RX_FLAG_AMPDU_DELIM_CRC_ERROR; |
| } |
| } |
| |
| int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp) |
| { |
| struct ath_rxbuf *bf; |
| struct sk_buff *skb = NULL, *requeue_skb, *hdr_skb; |
| struct ieee80211_rx_status *rxs; |
| struct ath_hw *ah = sc->sc_ah; |
| struct ath_common *common = ath9k_hw_common(ah); |
| struct ieee80211_hw *hw = sc->hw; |
| int retval; |
| struct ath_rx_status rs; |
| enum ath9k_rx_qtype qtype; |
| bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA); |
| int dma_type; |
| u64 tsf = 0; |
| unsigned long flags; |
| dma_addr_t new_buf_addr; |
| unsigned int budget = 512; |
| struct ieee80211_hdr *hdr; |
| |
| if (edma) |
| dma_type = DMA_BIDIRECTIONAL; |
| else |
| dma_type = DMA_FROM_DEVICE; |
| |
| qtype = hp ? ATH9K_RX_QUEUE_HP : ATH9K_RX_QUEUE_LP; |
| |
| tsf = ath9k_hw_gettsf64(ah); |
| |
| do { |
| bool decrypt_error = false; |
| |
| memset(&rs, 0, sizeof(rs)); |
| if (edma) |
| bf = ath_edma_get_next_rx_buf(sc, &rs, qtype); |
| else |
| bf = ath_get_next_rx_buf(sc, &rs); |
| |
| if (!bf) |
| break; |
| |
| skb = bf->bf_mpdu; |
| if (!skb) |
| continue; |
| |
| /* |
| * Take frame header from the first fragment and RX status from |
| * the last one. |
| */ |
| if (sc->rx.frag) |
| hdr_skb = sc->rx.frag; |
| else |
| hdr_skb = skb; |
| |
| rxs = IEEE80211_SKB_RXCB(hdr_skb); |
| memset(rxs, 0, sizeof(struct ieee80211_rx_status)); |
| |
| retval = ath9k_rx_skb_preprocess(sc, hdr_skb, &rs, rxs, |
| &decrypt_error, tsf); |
| if (retval) |
| goto requeue_drop_frag; |
| |
| /* Ensure we always have an skb to requeue once we are done |
| * processing the current buffer's skb */ |
| requeue_skb = ath_rxbuf_alloc(common, common->rx_bufsize, GFP_ATOMIC); |
| |
| /* If there is no memory we ignore the current RX'd frame, |
| * tell hardware it can give us a new frame using the old |
| * skb and put it at the tail of the sc->rx.rxbuf list for |
| * processing. */ |
| if (!requeue_skb) { |
| RX_STAT_INC(rx_oom_err); |
| goto requeue_drop_frag; |
| } |
| |
| /* We will now give hardware our shiny new allocated skb */ |
| new_buf_addr = dma_map_single(sc->dev, requeue_skb->data, |
| common->rx_bufsize, dma_type); |
| if (unlikely(dma_mapping_error(sc->dev, new_buf_addr))) { |
| dev_kfree_skb_any(requeue_skb); |
| goto requeue_drop_frag; |
| } |
| |
| /* Unmap the frame */ |
| dma_unmap_single(sc->dev, bf->bf_buf_addr, |
| common->rx_bufsize, dma_type); |
| |
| bf->bf_mpdu = requeue_skb; |
| bf->bf_buf_addr = new_buf_addr; |
| |
| skb_put(skb, rs.rs_datalen + ah->caps.rx_status_len); |
| if (ah->caps.rx_status_len) |
| skb_pull(skb, ah->caps.rx_status_len); |
| |
| if (!rs.rs_more) |
| ath9k_cmn_rx_skb_postprocess(common, hdr_skb, &rs, |
| rxs, decrypt_error); |
| |
| if (rs.rs_more) { |
| RX_STAT_INC(rx_frags); |
| /* |
| * rs_more indicates chained descriptors which can be |
| * used to link buffers together for a sort of |
| * scatter-gather operation. |
| */ |
| if (sc->rx.frag) { |
| /* too many fragments - cannot handle frame */ |
| dev_kfree_skb_any(sc->rx.frag); |
| dev_kfree_skb_any(skb); |
| RX_STAT_INC(rx_too_many_frags_err); |
| skb = NULL; |
| } |
| sc->rx.frag = skb; |
| goto requeue; |
| } |
| |
| if (sc->rx.frag) { |
| int space = skb->len - skb_tailroom(hdr_skb); |
| |
| if (pskb_expand_head(hdr_skb, 0, space, GFP_ATOMIC) < 0) { |
| dev_kfree_skb(skb); |
| RX_STAT_INC(rx_oom_err); |
| goto requeue_drop_frag; |
| } |
| |
| sc->rx.frag = NULL; |
| |
| skb_copy_from_linear_data(skb, skb_put(hdr_skb, skb->len), |
| skb->len); |
| dev_kfree_skb_any(skb); |
| skb = hdr_skb; |
| } |
| |
| if (rxs->flag & RX_FLAG_MMIC_STRIPPED) |
| skb_trim(skb, skb->len - 8); |
| |
| spin_lock_irqsave(&sc->sc_pm_lock, flags); |
| if ((sc->ps_flags & (PS_WAIT_FOR_BEACON | |
| PS_WAIT_FOR_CAB | |
| PS_WAIT_FOR_PSPOLL_DATA)) || |
| ath9k_check_auto_sleep(sc)) |
| ath_rx_ps(sc, skb, rs.is_mybeacon); |
| spin_unlock_irqrestore(&sc->sc_pm_lock, flags); |
| |
| ath9k_antenna_check(sc, &rs); |
| ath9k_apply_ampdu_details(sc, &rs, rxs); |
| ath_debug_rate_stats(sc, &rs, skb); |
| |
| hdr = (struct ieee80211_hdr *)skb->data; |
| if (ieee80211_is_ack(hdr->frame_control)) |
| ath_dynack_sample_ack_ts(sc->sc_ah, skb, rs.rs_tstamp); |
| |
| ieee80211_rx(hw, skb); |
| |
| requeue_drop_frag: |
| if (sc->rx.frag) { |
| dev_kfree_skb_any(sc->rx.frag); |
| sc->rx.frag = NULL; |
| } |
| requeue: |
| list_add_tail(&bf->list, &sc->rx.rxbuf); |
| |
| if (!edma) { |
| ath_rx_buf_relink(sc, bf, flush); |
| if (!flush) |
| ath9k_hw_rxena(ah); |
| } else if (!flush) { |
| ath_rx_edma_buf_link(sc, qtype); |
| } |
| |
| if (!budget--) |
| break; |
| } while (1); |
| |
| if (!(ah->imask & ATH9K_INT_RXEOL)) { |
| ah->imask |= (ATH9K_INT_RXEOL | ATH9K_INT_RXORN); |
| ath9k_hw_set_interrupts(ah); |
| } |
| |
| return 0; |
| } |