1203c4805SLuis R. Rodriguez /* 2203c4805SLuis R. Rodriguez * Copyright (c) 2008-2009 Atheros Communications Inc. 3203c4805SLuis R. Rodriguez * 4203c4805SLuis R. Rodriguez * Permission to use, copy, modify, and/or distribute this software for any 5203c4805SLuis R. Rodriguez * purpose with or without fee is hereby granted, provided that the above 6203c4805SLuis R. Rodriguez * copyright notice and this permission notice appear in all copies. 7203c4805SLuis R. Rodriguez * 8203c4805SLuis R. Rodriguez * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 9203c4805SLuis R. Rodriguez * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10203c4805SLuis R. Rodriguez * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 11203c4805SLuis R. Rodriguez * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12203c4805SLuis R. Rodriguez * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 13203c4805SLuis R. Rodriguez * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 14203c4805SLuis R. Rodriguez * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15203c4805SLuis R. Rodriguez */ 16203c4805SLuis R. Rodriguez 17203c4805SLuis R. Rodriguez #include "ath9k.h" 18203c4805SLuis R. Rodriguez 19203c4805SLuis R. Rodriguez static struct ieee80211_hw * ath_get_virt_hw(struct ath_softc *sc, 20203c4805SLuis R. Rodriguez struct ieee80211_hdr *hdr) 21203c4805SLuis R. Rodriguez { 22203c4805SLuis R. Rodriguez struct ieee80211_hw *hw = sc->pri_wiphy->hw; 23203c4805SLuis R. Rodriguez int i; 24203c4805SLuis R. Rodriguez 25203c4805SLuis R. Rodriguez spin_lock_bh(&sc->wiphy_lock); 26203c4805SLuis R. Rodriguez for (i = 0; i < sc->num_sec_wiphy; i++) { 27203c4805SLuis R. Rodriguez struct ath_wiphy *aphy = sc->sec_wiphy[i]; 28203c4805SLuis R. Rodriguez if (aphy == NULL) 29203c4805SLuis R. Rodriguez continue; 30203c4805SLuis R. Rodriguez if (compare_ether_addr(hdr->addr1, aphy->hw->wiphy->perm_addr) 31203c4805SLuis R. Rodriguez == 0) { 32203c4805SLuis R. Rodriguez hw = aphy->hw; 33203c4805SLuis R. Rodriguez break; 34203c4805SLuis R. Rodriguez } 35203c4805SLuis R. Rodriguez } 36203c4805SLuis R. Rodriguez spin_unlock_bh(&sc->wiphy_lock); 37203c4805SLuis R. Rodriguez return hw; 38203c4805SLuis R. Rodriguez } 39203c4805SLuis R. Rodriguez 40203c4805SLuis R. Rodriguez /* 41203c4805SLuis R. Rodriguez * Setup and link descriptors. 42203c4805SLuis R. Rodriguez * 43203c4805SLuis R. Rodriguez * 11N: we can no longer afford to self link the last descriptor. 44203c4805SLuis R. Rodriguez * MAC acknowledges BA status as long as it copies frames to host 45203c4805SLuis R. Rodriguez * buffer (or rx fifo). This can incorrectly acknowledge packets 46203c4805SLuis R. Rodriguez * to a sender if last desc is self-linked. 47203c4805SLuis R. Rodriguez */ 48203c4805SLuis R. Rodriguez static void ath_rx_buf_link(struct ath_softc *sc, struct ath_buf *bf) 49203c4805SLuis R. Rodriguez { 50203c4805SLuis R. Rodriguez struct ath_hw *ah = sc->sc_ah; 51203c4805SLuis R. Rodriguez struct ath_desc *ds; 52203c4805SLuis R. Rodriguez struct sk_buff *skb; 53203c4805SLuis R. Rodriguez 54203c4805SLuis R. Rodriguez ATH_RXBUF_RESET(bf); 55203c4805SLuis R. Rodriguez 56203c4805SLuis R. Rodriguez ds = bf->bf_desc; 57203c4805SLuis R. Rodriguez ds->ds_link = 0; /* link to null */ 58203c4805SLuis R. Rodriguez ds->ds_data = bf->bf_buf_addr; 59203c4805SLuis R. Rodriguez 60203c4805SLuis R. Rodriguez /* virtual addr of the beginning of the buffer. */ 61203c4805SLuis R. Rodriguez skb = bf->bf_mpdu; 629680e8a3SLuis R. Rodriguez BUG_ON(skb == NULL); 63203c4805SLuis R. Rodriguez ds->ds_vdata = skb->data; 64203c4805SLuis R. Rodriguez 65203c4805SLuis R. Rodriguez /* setup rx descriptors. The rx.bufsize here tells the harware 66203c4805SLuis R. Rodriguez * how much data it can DMA to us and that we are prepared 67203c4805SLuis R. Rodriguez * to process */ 68203c4805SLuis R. Rodriguez ath9k_hw_setuprxdesc(ah, ds, 69203c4805SLuis R. Rodriguez sc->rx.bufsize, 70203c4805SLuis R. Rodriguez 0); 71203c4805SLuis R. Rodriguez 72203c4805SLuis R. Rodriguez if (sc->rx.rxlink == NULL) 73203c4805SLuis R. Rodriguez ath9k_hw_putrxbuf(ah, bf->bf_daddr); 74203c4805SLuis R. Rodriguez else 75203c4805SLuis R. Rodriguez *sc->rx.rxlink = bf->bf_daddr; 76203c4805SLuis R. Rodriguez 77203c4805SLuis R. Rodriguez sc->rx.rxlink = &ds->ds_link; 78203c4805SLuis R. Rodriguez ath9k_hw_rxena(ah); 79203c4805SLuis R. Rodriguez } 80203c4805SLuis R. Rodriguez 81203c4805SLuis R. Rodriguez static void ath_setdefantenna(struct ath_softc *sc, u32 antenna) 82203c4805SLuis R. Rodriguez { 83203c4805SLuis R. Rodriguez /* XXX block beacon interrupts */ 84203c4805SLuis R. Rodriguez ath9k_hw_setantenna(sc->sc_ah, antenna); 85203c4805SLuis R. Rodriguez sc->rx.defant = antenna; 86203c4805SLuis R. Rodriguez sc->rx.rxotherant = 0; 87203c4805SLuis R. Rodriguez } 88203c4805SLuis R. Rodriguez 89203c4805SLuis R. Rodriguez /* 90203c4805SLuis R. Rodriguez * Extend 15-bit time stamp from rx descriptor to 91203c4805SLuis R. Rodriguez * a full 64-bit TSF using the current h/w TSF. 92203c4805SLuis R. Rodriguez */ 93203c4805SLuis R. Rodriguez static u64 ath_extend_tsf(struct ath_softc *sc, u32 rstamp) 94203c4805SLuis R. Rodriguez { 95203c4805SLuis R. Rodriguez u64 tsf; 96203c4805SLuis R. Rodriguez 97203c4805SLuis R. Rodriguez tsf = ath9k_hw_gettsf64(sc->sc_ah); 98203c4805SLuis R. Rodriguez if ((tsf & 0x7fff) < rstamp) 99203c4805SLuis R. Rodriguez tsf -= 0x8000; 100203c4805SLuis R. Rodriguez return (tsf & ~0x7fff) | rstamp; 101203c4805SLuis R. Rodriguez } 102203c4805SLuis R. Rodriguez 103203c4805SLuis R. Rodriguez /* 104203c4805SLuis R. Rodriguez * For Decrypt or Demic errors, we only mark packet status here and always push 105203c4805SLuis R. Rodriguez * up the frame up to let mac80211 handle the actual error case, be it no 106203c4805SLuis R. Rodriguez * decryption key or real decryption error. This let us keep statistics there. 107203c4805SLuis R. Rodriguez */ 108*b4afffc0SLuis R. Rodriguez static int ath_rx_prepare(struct ieee80211_hw *hw, 109*b4afffc0SLuis R. Rodriguez struct sk_buff *skb, struct ath_desc *ds, 110203c4805SLuis R. Rodriguez struct ieee80211_rx_status *rx_status, bool *decrypt_error, 111203c4805SLuis R. Rodriguez struct ath_softc *sc) 112203c4805SLuis R. Rodriguez { 113203c4805SLuis R. Rodriguez struct ieee80211_hdr *hdr; 114203c4805SLuis R. Rodriguez u8 ratecode; 115203c4805SLuis R. Rodriguez __le16 fc; 116a59b5a5eSSenthil Balasubramanian struct ieee80211_sta *sta; 117a59b5a5eSSenthil Balasubramanian struct ath_node *an; 118a59b5a5eSSenthil Balasubramanian int last_rssi = ATH_RSSI_DUMMY_MARKER; 119a59b5a5eSSenthil Balasubramanian 120203c4805SLuis R. Rodriguez hdr = (struct ieee80211_hdr *)skb->data; 121203c4805SLuis R. Rodriguez fc = hdr->frame_control; 122203c4805SLuis R. Rodriguez memset(rx_status, 0, sizeof(struct ieee80211_rx_status)); 123203c4805SLuis R. Rodriguez 124203c4805SLuis R. Rodriguez if (ds->ds_rxstat.rs_more) { 125203c4805SLuis R. Rodriguez /* 126203c4805SLuis R. Rodriguez * Frame spans multiple descriptors; this cannot happen yet 127203c4805SLuis R. Rodriguez * as we don't support jumbograms. If not in monitor mode, 128203c4805SLuis R. Rodriguez * discard the frame. Enable this if you want to see 129203c4805SLuis R. Rodriguez * error frames in Monitor mode. 130203c4805SLuis R. Rodriguez */ 131203c4805SLuis R. Rodriguez if (sc->sc_ah->opmode != NL80211_IFTYPE_MONITOR) 132203c4805SLuis R. Rodriguez goto rx_next; 133203c4805SLuis R. Rodriguez } else if (ds->ds_rxstat.rs_status != 0) { 134203c4805SLuis R. Rodriguez if (ds->ds_rxstat.rs_status & ATH9K_RXERR_CRC) 135203c4805SLuis R. Rodriguez rx_status->flag |= RX_FLAG_FAILED_FCS_CRC; 136203c4805SLuis R. Rodriguez if (ds->ds_rxstat.rs_status & ATH9K_RXERR_PHY) 137203c4805SLuis R. Rodriguez goto rx_next; 138203c4805SLuis R. Rodriguez 139203c4805SLuis R. Rodriguez if (ds->ds_rxstat.rs_status & ATH9K_RXERR_DECRYPT) { 140203c4805SLuis R. Rodriguez *decrypt_error = true; 141203c4805SLuis R. Rodriguez } else if (ds->ds_rxstat.rs_status & ATH9K_RXERR_MIC) { 142203c4805SLuis R. Rodriguez if (ieee80211_is_ctl(fc)) 143203c4805SLuis R. Rodriguez /* 144203c4805SLuis R. Rodriguez * Sometimes, we get invalid 145203c4805SLuis R. Rodriguez * MIC failures on valid control frames. 146203c4805SLuis R. Rodriguez * Remove these mic errors. 147203c4805SLuis R. Rodriguez */ 148203c4805SLuis R. Rodriguez ds->ds_rxstat.rs_status &= ~ATH9K_RXERR_MIC; 149203c4805SLuis R. Rodriguez else 150203c4805SLuis R. Rodriguez rx_status->flag |= RX_FLAG_MMIC_ERROR; 151203c4805SLuis R. Rodriguez } 152203c4805SLuis R. Rodriguez /* 153203c4805SLuis R. Rodriguez * Reject error frames with the exception of 154203c4805SLuis R. Rodriguez * decryption and MIC failures. For monitor mode, 155203c4805SLuis R. Rodriguez * we also ignore the CRC error. 156203c4805SLuis R. Rodriguez */ 157203c4805SLuis R. Rodriguez if (sc->sc_ah->opmode == NL80211_IFTYPE_MONITOR) { 158203c4805SLuis R. Rodriguez if (ds->ds_rxstat.rs_status & 159203c4805SLuis R. Rodriguez ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC | 160203c4805SLuis R. Rodriguez ATH9K_RXERR_CRC)) 161203c4805SLuis R. Rodriguez goto rx_next; 162203c4805SLuis R. Rodriguez } else { 163203c4805SLuis R. Rodriguez if (ds->ds_rxstat.rs_status & 164203c4805SLuis R. Rodriguez ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) { 165203c4805SLuis R. Rodriguez goto rx_next; 166203c4805SLuis R. Rodriguez } 167203c4805SLuis R. Rodriguez } 168203c4805SLuis R. Rodriguez } 169203c4805SLuis R. Rodriguez 170203c4805SLuis R. Rodriguez ratecode = ds->ds_rxstat.rs_rate; 171203c4805SLuis R. Rodriguez 172203c4805SLuis R. Rodriguez if (ratecode & 0x80) { 173203c4805SLuis R. Rodriguez /* HT rate */ 174203c4805SLuis R. Rodriguez rx_status->flag |= RX_FLAG_HT; 175203c4805SLuis R. Rodriguez if (ds->ds_rxstat.rs_flags & ATH9K_RX_2040) 176203c4805SLuis R. Rodriguez rx_status->flag |= RX_FLAG_40MHZ; 177203c4805SLuis R. Rodriguez if (ds->ds_rxstat.rs_flags & ATH9K_RX_GI) 178203c4805SLuis R. Rodriguez rx_status->flag |= RX_FLAG_SHORT_GI; 179203c4805SLuis R. Rodriguez rx_status->rate_idx = ratecode & 0x7f; 180203c4805SLuis R. Rodriguez } else { 181203c4805SLuis R. Rodriguez int i = 0, cur_band, n_rates; 182203c4805SLuis R. Rodriguez 183203c4805SLuis R. Rodriguez cur_band = hw->conf.channel->band; 184203c4805SLuis R. Rodriguez n_rates = sc->sbands[cur_band].n_bitrates; 185203c4805SLuis R. Rodriguez 186203c4805SLuis R. Rodriguez for (i = 0; i < n_rates; i++) { 187203c4805SLuis R. Rodriguez if (sc->sbands[cur_band].bitrates[i].hw_value == 188203c4805SLuis R. Rodriguez ratecode) { 189203c4805SLuis R. Rodriguez rx_status->rate_idx = i; 190203c4805SLuis R. Rodriguez break; 191203c4805SLuis R. Rodriguez } 192203c4805SLuis R. Rodriguez 193203c4805SLuis R. Rodriguez if (sc->sbands[cur_band].bitrates[i].hw_value_short == 194203c4805SLuis R. Rodriguez ratecode) { 195203c4805SLuis R. Rodriguez rx_status->rate_idx = i; 196203c4805SLuis R. Rodriguez rx_status->flag |= RX_FLAG_SHORTPRE; 197203c4805SLuis R. Rodriguez break; 198203c4805SLuis R. Rodriguez } 199203c4805SLuis R. Rodriguez } 200203c4805SLuis R. Rodriguez } 201203c4805SLuis R. Rodriguez 202a59b5a5eSSenthil Balasubramanian rcu_read_lock(); 2035ed176e1SJohannes Berg /* XXX: use ieee80211_find_sta! */ 2045ed176e1SJohannes Berg sta = ieee80211_find_sta_by_hw(sc->hw, hdr->addr2); 205a59b5a5eSSenthil Balasubramanian if (sta) { 206a59b5a5eSSenthil Balasubramanian an = (struct ath_node *) sta->drv_priv; 207a59b5a5eSSenthil Balasubramanian if (ds->ds_rxstat.rs_rssi != ATH9K_RSSI_BAD && 208a59b5a5eSSenthil Balasubramanian !ds->ds_rxstat.rs_moreaggr) 209a59b5a5eSSenthil Balasubramanian ATH_RSSI_LPF(an->last_rssi, ds->ds_rxstat.rs_rssi); 210a59b5a5eSSenthil Balasubramanian last_rssi = an->last_rssi; 211a59b5a5eSSenthil Balasubramanian } 212a59b5a5eSSenthil Balasubramanian rcu_read_unlock(); 213a59b5a5eSSenthil Balasubramanian 214a59b5a5eSSenthil Balasubramanian if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER)) 215a59b5a5eSSenthil Balasubramanian ds->ds_rxstat.rs_rssi = ATH_EP_RND(last_rssi, 216a59b5a5eSSenthil Balasubramanian ATH_RSSI_EP_MULTIPLIER); 217a59b5a5eSSenthil Balasubramanian if (ds->ds_rxstat.rs_rssi < 0) 218a59b5a5eSSenthil Balasubramanian ds->ds_rxstat.rs_rssi = 0; 219a59b5a5eSSenthil Balasubramanian else if (ds->ds_rxstat.rs_rssi > 127) 220a59b5a5eSSenthil Balasubramanian ds->ds_rxstat.rs_rssi = 127; 221a59b5a5eSSenthil Balasubramanian 2225e32b1edSSujith /* Update Beacon RSSI, this is used by ANI. */ 2235e32b1edSSujith if (ieee80211_is_beacon(fc)) 22422e66a4cSVasanthakumar Thiagarajan sc->sc_ah->stats.avgbrssi = ds->ds_rxstat.rs_rssi; 2255e32b1edSSujith 226203c4805SLuis R. Rodriguez rx_status->mactime = ath_extend_tsf(sc, ds->ds_rxstat.rs_tstamp); 227203c4805SLuis R. Rodriguez rx_status->band = hw->conf.channel->band; 228203c4805SLuis R. Rodriguez rx_status->freq = hw->conf.channel->center_freq; 229203c4805SLuis R. Rodriguez rx_status->noise = sc->ani.noise_floor; 230a59b5a5eSSenthil Balasubramanian rx_status->signal = ATH_DEFAULT_NOISE_FLOOR + ds->ds_rxstat.rs_rssi; 231203c4805SLuis R. Rodriguez rx_status->antenna = ds->ds_rxstat.rs_antenna; 232203c4805SLuis R. Rodriguez 2337d5ca3b8SLuis R. Rodriguez /* 2347d5ca3b8SLuis R. Rodriguez * Theory for reporting quality: 2357d5ca3b8SLuis R. Rodriguez * 2367d5ca3b8SLuis R. Rodriguez * At a hardware RSSI of 45 you will be able to use MCS 7 reliably. 2377d5ca3b8SLuis R. Rodriguez * At a hardware RSSI of 45 you will be able to use MCS 15 reliably. 2387d5ca3b8SLuis R. Rodriguez * At a hardware RSSI of 35 you should be able use 54 Mbps reliably. 2397d5ca3b8SLuis R. Rodriguez * 2407d5ca3b8SLuis R. Rodriguez * MCS 7 is the highets MCS index usable by a 1-stream device. 2417d5ca3b8SLuis R. Rodriguez * MCS 15 is the highest MCS index usable by a 2-stream device. 2427d5ca3b8SLuis R. Rodriguez * 2437d5ca3b8SLuis R. Rodriguez * All ath9k devices are either 1-stream or 2-stream. 2447d5ca3b8SLuis R. Rodriguez * 2457d5ca3b8SLuis R. Rodriguez * How many bars you see is derived from the qual reporting. 2467d5ca3b8SLuis R. Rodriguez * 2477d5ca3b8SLuis R. Rodriguez * A more elaborate scheme can be used here but it requires tables 2487d5ca3b8SLuis R. Rodriguez * of SNR/throughput for each possible mode used. For the MCS table 2497d5ca3b8SLuis R. Rodriguez * you can refer to the wireless wiki: 2507d5ca3b8SLuis R. Rodriguez * 2517d5ca3b8SLuis R. Rodriguez * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n 2527d5ca3b8SLuis R. Rodriguez * 2537d5ca3b8SLuis R. Rodriguez */ 2547d5ca3b8SLuis R. Rodriguez if (conf_is_ht(&hw->conf)) 255203c4805SLuis R. Rodriguez rx_status->qual = ds->ds_rxstat.rs_rssi * 100 / 45; 2567d5ca3b8SLuis R. Rodriguez else 2577d5ca3b8SLuis R. Rodriguez rx_status->qual = ds->ds_rxstat.rs_rssi * 100 / 35; 258203c4805SLuis R. Rodriguez 259203c4805SLuis R. Rodriguez /* rssi can be more than 45 though, anything above that 260203c4805SLuis R. Rodriguez * should be considered at 100% */ 261203c4805SLuis R. Rodriguez if (rx_status->qual > 100) 262203c4805SLuis R. Rodriguez rx_status->qual = 100; 263203c4805SLuis R. Rodriguez 264203c4805SLuis R. Rodriguez rx_status->flag |= RX_FLAG_TSFT; 265203c4805SLuis R. Rodriguez 266203c4805SLuis R. Rodriguez return 1; 267203c4805SLuis R. Rodriguez rx_next: 268203c4805SLuis R. Rodriguez return 0; 269203c4805SLuis R. Rodriguez } 270203c4805SLuis R. Rodriguez 271203c4805SLuis R. Rodriguez static void ath_opmode_init(struct ath_softc *sc) 272203c4805SLuis R. Rodriguez { 273203c4805SLuis R. Rodriguez struct ath_hw *ah = sc->sc_ah; 2741510718dSLuis R. Rodriguez struct ath_common *common = ath9k_hw_common(ah); 2751510718dSLuis R. Rodriguez 276203c4805SLuis R. Rodriguez u32 rfilt, mfilt[2]; 277203c4805SLuis R. Rodriguez 278203c4805SLuis R. Rodriguez /* configure rx filter */ 279203c4805SLuis R. Rodriguez rfilt = ath_calcrxfilter(sc); 280203c4805SLuis R. Rodriguez ath9k_hw_setrxfilter(ah, rfilt); 281203c4805SLuis R. Rodriguez 282203c4805SLuis R. Rodriguez /* configure bssid mask */ 283203c4805SLuis R. Rodriguez if (ah->caps.hw_caps & ATH9K_HW_CAP_BSSIDMASK) 28413b81559SLuis R. Rodriguez ath_hw_setbssidmask(common); 285203c4805SLuis R. Rodriguez 286203c4805SLuis R. Rodriguez /* configure operational mode */ 287203c4805SLuis R. Rodriguez ath9k_hw_setopmode(ah); 288203c4805SLuis R. Rodriguez 289203c4805SLuis R. Rodriguez /* Handle any link-level address change. */ 2901510718dSLuis R. Rodriguez ath9k_hw_setmac(ah, common->macaddr); 291203c4805SLuis R. Rodriguez 292203c4805SLuis R. Rodriguez /* calculate and install multicast filter */ 293203c4805SLuis R. Rodriguez mfilt[0] = mfilt[1] = ~0; 294203c4805SLuis R. Rodriguez ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]); 295203c4805SLuis R. Rodriguez } 296203c4805SLuis R. Rodriguez 297203c4805SLuis R. Rodriguez int ath_rx_init(struct ath_softc *sc, int nbufs) 298203c4805SLuis R. Rodriguez { 29927c51f1aSLuis R. Rodriguez struct ath_common *common = ath9k_hw_common(sc->sc_ah); 300203c4805SLuis R. Rodriguez struct sk_buff *skb; 301203c4805SLuis R. Rodriguez struct ath_buf *bf; 302203c4805SLuis R. Rodriguez int error = 0; 303203c4805SLuis R. Rodriguez 304203c4805SLuis R. Rodriguez spin_lock_init(&sc->rx.rxflushlock); 305203c4805SLuis R. Rodriguez sc->sc_flags &= ~SC_OP_RXFLUSH; 306203c4805SLuis R. Rodriguez spin_lock_init(&sc->rx.rxbuflock); 307203c4805SLuis R. Rodriguez 308203c4805SLuis R. Rodriguez sc->rx.bufsize = roundup(IEEE80211_MAX_MPDU_LEN, 30927c51f1aSLuis R. Rodriguez min(common->cachelsz, (u16)64)); 310203c4805SLuis R. Rodriguez 311c46917bbSLuis R. Rodriguez ath_print(common, ATH_DBG_CONFIG, "cachelsz %u rxbufsize %u\n", 31227c51f1aSLuis R. Rodriguez common->cachelsz, sc->rx.bufsize); 313203c4805SLuis R. Rodriguez 314203c4805SLuis R. Rodriguez /* Initialize rx descriptors */ 315203c4805SLuis R. Rodriguez 316203c4805SLuis R. Rodriguez error = ath_descdma_setup(sc, &sc->rx.rxdma, &sc->rx.rxbuf, 317203c4805SLuis R. Rodriguez "rx", nbufs, 1); 318203c4805SLuis R. Rodriguez if (error != 0) { 319c46917bbSLuis R. Rodriguez ath_print(common, ATH_DBG_FATAL, 320203c4805SLuis R. Rodriguez "failed to allocate rx descriptors: %d\n", error); 321203c4805SLuis R. Rodriguez goto err; 322203c4805SLuis R. Rodriguez } 323203c4805SLuis R. Rodriguez 324203c4805SLuis R. Rodriguez list_for_each_entry(bf, &sc->rx.rxbuf, list) { 32527c51f1aSLuis R. Rodriguez skb = ath_rxbuf_alloc(common, sc->rx.bufsize, GFP_KERNEL); 326203c4805SLuis R. Rodriguez if (skb == NULL) { 327203c4805SLuis R. Rodriguez error = -ENOMEM; 328203c4805SLuis R. Rodriguez goto err; 329203c4805SLuis R. Rodriguez } 330203c4805SLuis R. Rodriguez 331203c4805SLuis R. Rodriguez bf->bf_mpdu = skb; 332203c4805SLuis R. Rodriguez bf->bf_buf_addr = dma_map_single(sc->dev, skb->data, 333203c4805SLuis R. Rodriguez sc->rx.bufsize, 334203c4805SLuis R. Rodriguez DMA_FROM_DEVICE); 335203c4805SLuis R. Rodriguez if (unlikely(dma_mapping_error(sc->dev, 336203c4805SLuis R. Rodriguez bf->bf_buf_addr))) { 337203c4805SLuis R. Rodriguez dev_kfree_skb_any(skb); 338203c4805SLuis R. Rodriguez bf->bf_mpdu = NULL; 339c46917bbSLuis R. Rodriguez ath_print(common, ATH_DBG_FATAL, 340203c4805SLuis R. Rodriguez "dma_mapping_error() on RX init\n"); 341203c4805SLuis R. Rodriguez error = -ENOMEM; 342203c4805SLuis R. Rodriguez goto err; 343203c4805SLuis R. Rodriguez } 344203c4805SLuis R. Rodriguez bf->bf_dmacontext = bf->bf_buf_addr; 345203c4805SLuis R. Rodriguez } 346203c4805SLuis R. Rodriguez sc->rx.rxlink = NULL; 347203c4805SLuis R. Rodriguez 348203c4805SLuis R. Rodriguez err: 349203c4805SLuis R. Rodriguez if (error) 350203c4805SLuis R. Rodriguez ath_rx_cleanup(sc); 351203c4805SLuis R. Rodriguez 352203c4805SLuis R. Rodriguez return error; 353203c4805SLuis R. Rodriguez } 354203c4805SLuis R. Rodriguez 355203c4805SLuis R. Rodriguez void ath_rx_cleanup(struct ath_softc *sc) 356203c4805SLuis R. Rodriguez { 357203c4805SLuis R. Rodriguez struct sk_buff *skb; 358203c4805SLuis R. Rodriguez struct ath_buf *bf; 359203c4805SLuis R. Rodriguez 360203c4805SLuis R. Rodriguez list_for_each_entry(bf, &sc->rx.rxbuf, list) { 361203c4805SLuis R. Rodriguez skb = bf->bf_mpdu; 362203c4805SLuis R. Rodriguez if (skb) { 363203c4805SLuis R. Rodriguez dma_unmap_single(sc->dev, bf->bf_buf_addr, 364203c4805SLuis R. Rodriguez sc->rx.bufsize, DMA_FROM_DEVICE); 365203c4805SLuis R. Rodriguez dev_kfree_skb(skb); 366203c4805SLuis R. Rodriguez } 367203c4805SLuis R. Rodriguez } 368203c4805SLuis R. Rodriguez 369203c4805SLuis R. Rodriguez if (sc->rx.rxdma.dd_desc_len != 0) 370203c4805SLuis R. Rodriguez ath_descdma_cleanup(sc, &sc->rx.rxdma, &sc->rx.rxbuf); 371203c4805SLuis R. Rodriguez } 372203c4805SLuis R. Rodriguez 373203c4805SLuis R. Rodriguez /* 374203c4805SLuis R. Rodriguez * Calculate the receive filter according to the 375203c4805SLuis R. Rodriguez * operating mode and state: 376203c4805SLuis R. Rodriguez * 377203c4805SLuis R. Rodriguez * o always accept unicast, broadcast, and multicast traffic 378203c4805SLuis R. Rodriguez * o maintain current state of phy error reception (the hal 379203c4805SLuis R. Rodriguez * may enable phy error frames for noise immunity work) 380203c4805SLuis R. Rodriguez * o probe request frames are accepted only when operating in 381203c4805SLuis R. Rodriguez * hostap, adhoc, or monitor modes 382203c4805SLuis R. Rodriguez * o enable promiscuous mode according to the interface state 383203c4805SLuis R. Rodriguez * o accept beacons: 384203c4805SLuis R. Rodriguez * - when operating in adhoc mode so the 802.11 layer creates 385203c4805SLuis R. Rodriguez * node table entries for peers, 386203c4805SLuis R. Rodriguez * - when operating in station mode for collecting rssi data when 387203c4805SLuis R. Rodriguez * the station is otherwise quiet, or 388203c4805SLuis R. Rodriguez * - when operating as a repeater so we see repeater-sta beacons 389203c4805SLuis R. Rodriguez * - when scanning 390203c4805SLuis R. Rodriguez */ 391203c4805SLuis R. Rodriguez 392203c4805SLuis R. Rodriguez u32 ath_calcrxfilter(struct ath_softc *sc) 393203c4805SLuis R. Rodriguez { 394203c4805SLuis R. Rodriguez #define RX_FILTER_PRESERVE (ATH9K_RX_FILTER_PHYERR | ATH9K_RX_FILTER_PHYRADAR) 395203c4805SLuis R. Rodriguez 396203c4805SLuis R. Rodriguez u32 rfilt; 397203c4805SLuis R. Rodriguez 398203c4805SLuis R. Rodriguez rfilt = (ath9k_hw_getrxfilter(sc->sc_ah) & RX_FILTER_PRESERVE) 399203c4805SLuis R. Rodriguez | ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST 400203c4805SLuis R. Rodriguez | ATH9K_RX_FILTER_MCAST; 401203c4805SLuis R. Rodriguez 402203c4805SLuis R. Rodriguez /* If not a STA, enable processing of Probe Requests */ 403203c4805SLuis R. Rodriguez if (sc->sc_ah->opmode != NL80211_IFTYPE_STATION) 404203c4805SLuis R. Rodriguez rfilt |= ATH9K_RX_FILTER_PROBEREQ; 405203c4805SLuis R. Rodriguez 406203c4805SLuis R. Rodriguez /* 407203c4805SLuis R. Rodriguez * Set promiscuous mode when FIF_PROMISC_IN_BSS is enabled for station 408203c4805SLuis R. Rodriguez * mode interface or when in monitor mode. AP mode does not need this 409203c4805SLuis R. Rodriguez * since it receives all in-BSS frames anyway. 410203c4805SLuis R. Rodriguez */ 411203c4805SLuis R. Rodriguez if (((sc->sc_ah->opmode != NL80211_IFTYPE_AP) && 412203c4805SLuis R. Rodriguez (sc->rx.rxfilter & FIF_PROMISC_IN_BSS)) || 413203c4805SLuis R. Rodriguez (sc->sc_ah->opmode == NL80211_IFTYPE_MONITOR)) 414203c4805SLuis R. Rodriguez rfilt |= ATH9K_RX_FILTER_PROM; 415203c4805SLuis R. Rodriguez 416203c4805SLuis R. Rodriguez if (sc->rx.rxfilter & FIF_CONTROL) 417203c4805SLuis R. Rodriguez rfilt |= ATH9K_RX_FILTER_CONTROL; 418203c4805SLuis R. Rodriguez 419203c4805SLuis R. Rodriguez if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) && 420203c4805SLuis R. Rodriguez !(sc->rx.rxfilter & FIF_BCN_PRBRESP_PROMISC)) 421203c4805SLuis R. Rodriguez rfilt |= ATH9K_RX_FILTER_MYBEACON; 422203c4805SLuis R. Rodriguez else 423203c4805SLuis R. Rodriguez rfilt |= ATH9K_RX_FILTER_BEACON; 424203c4805SLuis R. Rodriguez 42566afad01SSenthil Balasubramanian if ((AR_SREV_9280_10_OR_LATER(sc->sc_ah) || 42666afad01SSenthil Balasubramanian AR_SREV_9285_10_OR_LATER(sc->sc_ah)) && 42766afad01SSenthil Balasubramanian (sc->sc_ah->opmode == NL80211_IFTYPE_AP) && 42866afad01SSenthil Balasubramanian (sc->rx.rxfilter & FIF_PSPOLL)) 429203c4805SLuis R. Rodriguez rfilt |= ATH9K_RX_FILTER_PSPOLL; 430203c4805SLuis R. Rodriguez 4317ea310beSSujith if (conf_is_ht(&sc->hw->conf)) 4327ea310beSSujith rfilt |= ATH9K_RX_FILTER_COMP_BAR; 4337ea310beSSujith 4345eb6ba83SJavier Cardona if (sc->sec_wiphy || (sc->rx.rxfilter & FIF_OTHER_BSS)) { 435203c4805SLuis R. Rodriguez /* TODO: only needed if more than one BSSID is in use in 436203c4805SLuis R. Rodriguez * station/adhoc mode */ 4375eb6ba83SJavier Cardona /* The following may also be needed for other older chips */ 4385eb6ba83SJavier Cardona if (sc->sc_ah->hw_version.macVersion == AR_SREV_VERSION_9160) 4395eb6ba83SJavier Cardona rfilt |= ATH9K_RX_FILTER_PROM; 440203c4805SLuis R. Rodriguez rfilt |= ATH9K_RX_FILTER_MCAST_BCAST_ALL; 441203c4805SLuis R. Rodriguez } 442203c4805SLuis R. Rodriguez 443203c4805SLuis R. Rodriguez return rfilt; 444203c4805SLuis R. Rodriguez 445203c4805SLuis R. Rodriguez #undef RX_FILTER_PRESERVE 446203c4805SLuis R. Rodriguez } 447203c4805SLuis R. Rodriguez 448203c4805SLuis R. Rodriguez int ath_startrecv(struct ath_softc *sc) 449203c4805SLuis R. Rodriguez { 450203c4805SLuis R. Rodriguez struct ath_hw *ah = sc->sc_ah; 451203c4805SLuis R. Rodriguez struct ath_buf *bf, *tbf; 452203c4805SLuis R. Rodriguez 453203c4805SLuis R. Rodriguez spin_lock_bh(&sc->rx.rxbuflock); 454203c4805SLuis R. Rodriguez if (list_empty(&sc->rx.rxbuf)) 455203c4805SLuis R. Rodriguez goto start_recv; 456203c4805SLuis R. Rodriguez 457203c4805SLuis R. Rodriguez sc->rx.rxlink = NULL; 458203c4805SLuis R. Rodriguez list_for_each_entry_safe(bf, tbf, &sc->rx.rxbuf, list) { 459203c4805SLuis R. Rodriguez ath_rx_buf_link(sc, bf); 460203c4805SLuis R. Rodriguez } 461203c4805SLuis R. Rodriguez 462203c4805SLuis R. Rodriguez /* We could have deleted elements so the list may be empty now */ 463203c4805SLuis R. Rodriguez if (list_empty(&sc->rx.rxbuf)) 464203c4805SLuis R. Rodriguez goto start_recv; 465203c4805SLuis R. Rodriguez 466203c4805SLuis R. Rodriguez bf = list_first_entry(&sc->rx.rxbuf, struct ath_buf, list); 467203c4805SLuis R. Rodriguez ath9k_hw_putrxbuf(ah, bf->bf_daddr); 468203c4805SLuis R. Rodriguez ath9k_hw_rxena(ah); 469203c4805SLuis R. Rodriguez 470203c4805SLuis R. Rodriguez start_recv: 471203c4805SLuis R. Rodriguez spin_unlock_bh(&sc->rx.rxbuflock); 472203c4805SLuis R. Rodriguez ath_opmode_init(sc); 473203c4805SLuis R. Rodriguez ath9k_hw_startpcureceive(ah); 474203c4805SLuis R. Rodriguez 475203c4805SLuis R. Rodriguez return 0; 476203c4805SLuis R. Rodriguez } 477203c4805SLuis R. Rodriguez 478203c4805SLuis R. Rodriguez bool ath_stoprecv(struct ath_softc *sc) 479203c4805SLuis R. Rodriguez { 480203c4805SLuis R. Rodriguez struct ath_hw *ah = sc->sc_ah; 481203c4805SLuis R. Rodriguez bool stopped; 482203c4805SLuis R. Rodriguez 483203c4805SLuis R. Rodriguez ath9k_hw_stoppcurecv(ah); 484203c4805SLuis R. Rodriguez ath9k_hw_setrxfilter(ah, 0); 485203c4805SLuis R. Rodriguez stopped = ath9k_hw_stopdmarecv(ah); 486203c4805SLuis R. Rodriguez sc->rx.rxlink = NULL; 487203c4805SLuis R. Rodriguez 488203c4805SLuis R. Rodriguez return stopped; 489203c4805SLuis R. Rodriguez } 490203c4805SLuis R. Rodriguez 491203c4805SLuis R. Rodriguez void ath_flushrecv(struct ath_softc *sc) 492203c4805SLuis R. Rodriguez { 493203c4805SLuis R. Rodriguez spin_lock_bh(&sc->rx.rxflushlock); 494203c4805SLuis R. Rodriguez sc->sc_flags |= SC_OP_RXFLUSH; 495203c4805SLuis R. Rodriguez ath_rx_tasklet(sc, 1); 496203c4805SLuis R. Rodriguez sc->sc_flags &= ~SC_OP_RXFLUSH; 497203c4805SLuis R. Rodriguez spin_unlock_bh(&sc->rx.rxflushlock); 498203c4805SLuis R. Rodriguez } 499203c4805SLuis R. Rodriguez 500cc65965cSJouni Malinen static bool ath_beacon_dtim_pending_cab(struct sk_buff *skb) 501cc65965cSJouni Malinen { 502cc65965cSJouni Malinen /* Check whether the Beacon frame has DTIM indicating buffered bc/mc */ 503cc65965cSJouni Malinen struct ieee80211_mgmt *mgmt; 504cc65965cSJouni Malinen u8 *pos, *end, id, elen; 505cc65965cSJouni Malinen struct ieee80211_tim_ie *tim; 506cc65965cSJouni Malinen 507cc65965cSJouni Malinen mgmt = (struct ieee80211_mgmt *)skb->data; 508cc65965cSJouni Malinen pos = mgmt->u.beacon.variable; 509cc65965cSJouni Malinen end = skb->data + skb->len; 510cc65965cSJouni Malinen 511cc65965cSJouni Malinen while (pos + 2 < end) { 512cc65965cSJouni Malinen id = *pos++; 513cc65965cSJouni Malinen elen = *pos++; 514cc65965cSJouni Malinen if (pos + elen > end) 515cc65965cSJouni Malinen break; 516cc65965cSJouni Malinen 517cc65965cSJouni Malinen if (id == WLAN_EID_TIM) { 518cc65965cSJouni Malinen if (elen < sizeof(*tim)) 519cc65965cSJouni Malinen break; 520cc65965cSJouni Malinen tim = (struct ieee80211_tim_ie *) pos; 521cc65965cSJouni Malinen if (tim->dtim_count != 0) 522cc65965cSJouni Malinen break; 523cc65965cSJouni Malinen return tim->bitmap_ctrl & 0x01; 524cc65965cSJouni Malinen } 525cc65965cSJouni Malinen 526cc65965cSJouni Malinen pos += elen; 527cc65965cSJouni Malinen } 528cc65965cSJouni Malinen 529cc65965cSJouni Malinen return false; 530cc65965cSJouni Malinen } 531cc65965cSJouni Malinen 532cc65965cSJouni Malinen static void ath_rx_ps_beacon(struct ath_softc *sc, struct sk_buff *skb) 533cc65965cSJouni Malinen { 534cc65965cSJouni Malinen struct ieee80211_mgmt *mgmt; 5351510718dSLuis R. Rodriguez struct ath_common *common = ath9k_hw_common(sc->sc_ah); 536cc65965cSJouni Malinen 537cc65965cSJouni Malinen if (skb->len < 24 + 8 + 2 + 2) 538cc65965cSJouni Malinen return; 539cc65965cSJouni Malinen 540cc65965cSJouni Malinen mgmt = (struct ieee80211_mgmt *)skb->data; 5411510718dSLuis R. Rodriguez if (memcmp(common->curbssid, mgmt->bssid, ETH_ALEN) != 0) 542cc65965cSJouni Malinen return; /* not from our current AP */ 543cc65965cSJouni Malinen 544293dc5dfSGabor Juhos sc->sc_flags &= ~SC_OP_WAIT_FOR_BEACON; 545293dc5dfSGabor Juhos 546ccdfeab6SJouni Malinen if (sc->sc_flags & SC_OP_BEACON_SYNC) { 547ccdfeab6SJouni Malinen sc->sc_flags &= ~SC_OP_BEACON_SYNC; 548c46917bbSLuis R. Rodriguez ath_print(common, ATH_DBG_PS, 549c46917bbSLuis R. Rodriguez "Reconfigure Beacon timers based on " 550ccdfeab6SJouni Malinen "timestamp from the AP\n"); 551ccdfeab6SJouni Malinen ath_beacon_config(sc, NULL); 552ccdfeab6SJouni Malinen } 553ccdfeab6SJouni Malinen 554cc65965cSJouni Malinen if (ath_beacon_dtim_pending_cab(skb)) { 555cc65965cSJouni Malinen /* 556cc65965cSJouni Malinen * Remain awake waiting for buffered broadcast/multicast 55758f5fffdSGabor Juhos * frames. If the last broadcast/multicast frame is not 55858f5fffdSGabor Juhos * received properly, the next beacon frame will work as 55958f5fffdSGabor Juhos * a backup trigger for returning into NETWORK SLEEP state, 56058f5fffdSGabor Juhos * so we are waiting for it as well. 561cc65965cSJouni Malinen */ 562c46917bbSLuis R. Rodriguez ath_print(common, ATH_DBG_PS, "Received DTIM beacon indicating " 563cc65965cSJouni Malinen "buffered broadcast/multicast frame(s)\n"); 56458f5fffdSGabor Juhos sc->sc_flags |= SC_OP_WAIT_FOR_CAB | SC_OP_WAIT_FOR_BEACON; 565cc65965cSJouni Malinen return; 566cc65965cSJouni Malinen } 567cc65965cSJouni Malinen 568cc65965cSJouni Malinen if (sc->sc_flags & SC_OP_WAIT_FOR_CAB) { 569cc65965cSJouni Malinen /* 570cc65965cSJouni Malinen * This can happen if a broadcast frame is dropped or the AP 571cc65965cSJouni Malinen * fails to send a frame indicating that all CAB frames have 572cc65965cSJouni Malinen * been delivered. 573cc65965cSJouni Malinen */ 574293dc5dfSGabor Juhos sc->sc_flags &= ~SC_OP_WAIT_FOR_CAB; 575c46917bbSLuis R. Rodriguez ath_print(common, ATH_DBG_PS, 576c46917bbSLuis R. Rodriguez "PS wait for CAB frames timed out\n"); 577cc65965cSJouni Malinen } 578cc65965cSJouni Malinen } 579cc65965cSJouni Malinen 580cc65965cSJouni Malinen static void ath_rx_ps(struct ath_softc *sc, struct sk_buff *skb) 581cc65965cSJouni Malinen { 582cc65965cSJouni Malinen struct ieee80211_hdr *hdr; 583c46917bbSLuis R. Rodriguez struct ath_common *common = ath9k_hw_common(sc->sc_ah); 584cc65965cSJouni Malinen 585cc65965cSJouni Malinen hdr = (struct ieee80211_hdr *)skb->data; 586cc65965cSJouni Malinen 587cc65965cSJouni Malinen /* Process Beacon and CAB receive in PS state */ 5889a23f9caSJouni Malinen if ((sc->sc_flags & SC_OP_WAIT_FOR_BEACON) && 5899a23f9caSJouni Malinen ieee80211_is_beacon(hdr->frame_control)) 590cc65965cSJouni Malinen ath_rx_ps_beacon(sc, skb); 591cc65965cSJouni Malinen else if ((sc->sc_flags & SC_OP_WAIT_FOR_CAB) && 592cc65965cSJouni Malinen (ieee80211_is_data(hdr->frame_control) || 593cc65965cSJouni Malinen ieee80211_is_action(hdr->frame_control)) && 594cc65965cSJouni Malinen is_multicast_ether_addr(hdr->addr1) && 595cc65965cSJouni Malinen !ieee80211_has_moredata(hdr->frame_control)) { 596cc65965cSJouni Malinen /* 597cc65965cSJouni Malinen * No more broadcast/multicast frames to be received at this 598cc65965cSJouni Malinen * point. 599cc65965cSJouni Malinen */ 600293dc5dfSGabor Juhos sc->sc_flags &= ~SC_OP_WAIT_FOR_CAB; 601c46917bbSLuis R. Rodriguez ath_print(common, ATH_DBG_PS, 602c46917bbSLuis R. Rodriguez "All PS CAB frames received, back to sleep\n"); 6039a23f9caSJouni Malinen } else if ((sc->sc_flags & SC_OP_WAIT_FOR_PSPOLL_DATA) && 6049a23f9caSJouni Malinen !is_multicast_ether_addr(hdr->addr1) && 6059a23f9caSJouni Malinen !ieee80211_has_morefrags(hdr->frame_control)) { 6069a23f9caSJouni Malinen sc->sc_flags &= ~SC_OP_WAIT_FOR_PSPOLL_DATA; 607c46917bbSLuis R. Rodriguez ath_print(common, ATH_DBG_PS, 608c46917bbSLuis R. Rodriguez "Going back to sleep after having received " 609c46917bbSLuis R. Rodriguez "PS-Poll data (0x%x)\n", 6109a23f9caSJouni Malinen sc->sc_flags & (SC_OP_WAIT_FOR_BEACON | 6119a23f9caSJouni Malinen SC_OP_WAIT_FOR_CAB | 6129a23f9caSJouni Malinen SC_OP_WAIT_FOR_PSPOLL_DATA | 6139a23f9caSJouni Malinen SC_OP_WAIT_FOR_TX_ACK)); 614cc65965cSJouni Malinen } 615cc65965cSJouni Malinen } 616cc65965cSJouni Malinen 617*b4afffc0SLuis R. Rodriguez static void ath_rx_send_to_mac80211(struct ieee80211_hw *hw, 618*b4afffc0SLuis R. Rodriguez struct ath_softc *sc, struct sk_buff *skb, 6199d64a3cfSJouni Malinen struct ieee80211_rx_status *rx_status) 6209d64a3cfSJouni Malinen { 6219d64a3cfSJouni Malinen struct ieee80211_hdr *hdr; 6229d64a3cfSJouni Malinen 6239d64a3cfSJouni Malinen hdr = (struct ieee80211_hdr *)skb->data; 6249d64a3cfSJouni Malinen 6259d64a3cfSJouni Malinen /* Send the frame to mac80211 */ 6269d64a3cfSJouni Malinen if (is_multicast_ether_addr(hdr->addr1)) { 6279d64a3cfSJouni Malinen int i; 6289d64a3cfSJouni Malinen /* 6299d64a3cfSJouni Malinen * Deliver broadcast/multicast frames to all suitable 6309d64a3cfSJouni Malinen * virtual wiphys. 6319d64a3cfSJouni Malinen */ 6329d64a3cfSJouni Malinen /* TODO: filter based on channel configuration */ 6339d64a3cfSJouni Malinen for (i = 0; i < sc->num_sec_wiphy; i++) { 6349d64a3cfSJouni Malinen struct ath_wiphy *aphy = sc->sec_wiphy[i]; 6359d64a3cfSJouni Malinen struct sk_buff *nskb; 6369d64a3cfSJouni Malinen if (aphy == NULL) 6379d64a3cfSJouni Malinen continue; 6389d64a3cfSJouni Malinen nskb = skb_copy(skb, GFP_ATOMIC); 639f1d58c25SJohannes Berg if (nskb) { 640f1d58c25SJohannes Berg memcpy(IEEE80211_SKB_RXCB(nskb), rx_status, 641f1d58c25SJohannes Berg sizeof(*rx_status)); 642f1d58c25SJohannes Berg ieee80211_rx(aphy->hw, nskb); 6439d64a3cfSJouni Malinen } 644f1d58c25SJohannes Berg } 645f1d58c25SJohannes Berg memcpy(IEEE80211_SKB_RXCB(skb), rx_status, sizeof(*rx_status)); 646f1d58c25SJohannes Berg ieee80211_rx(sc->hw, skb); 6479d64a3cfSJouni Malinen } else { 6489d64a3cfSJouni Malinen /* Deliver unicast frames based on receiver address */ 649f1d58c25SJohannes Berg memcpy(IEEE80211_SKB_RXCB(skb), rx_status, sizeof(*rx_status)); 650*b4afffc0SLuis R. Rodriguez ieee80211_rx(hw, skb); 6519d64a3cfSJouni Malinen } 6529d64a3cfSJouni Malinen } 6539d64a3cfSJouni Malinen 654203c4805SLuis R. Rodriguez int ath_rx_tasklet(struct ath_softc *sc, int flush) 655203c4805SLuis R. Rodriguez { 656203c4805SLuis R. Rodriguez #define PA2DESC(_sc, _pa) \ 657203c4805SLuis R. Rodriguez ((struct ath_desc *)((caddr_t)(_sc)->rx.rxdma.dd_desc + \ 658203c4805SLuis R. Rodriguez ((_pa) - (_sc)->rx.rxdma.dd_desc_paddr))) 659203c4805SLuis R. Rodriguez 660203c4805SLuis R. Rodriguez struct ath_buf *bf; 661203c4805SLuis R. Rodriguez struct ath_desc *ds; 662203c4805SLuis R. Rodriguez struct sk_buff *skb = NULL, *requeue_skb; 663203c4805SLuis R. Rodriguez struct ieee80211_rx_status rx_status; 664203c4805SLuis R. Rodriguez struct ath_hw *ah = sc->sc_ah; 66527c51f1aSLuis R. Rodriguez struct ath_common *common = ath9k_hw_common(ah); 666*b4afffc0SLuis R. Rodriguez /* 667*b4afffc0SLuis R. Rodriguez * The hw can techncically differ from common->hw when using ath9k 668*b4afffc0SLuis R. Rodriguez * virtual wiphy so to account for that we iterate over the active 669*b4afffc0SLuis R. Rodriguez * wiphys and find the appropriate wiphy and therefore hw. 670*b4afffc0SLuis R. Rodriguez */ 671*b4afffc0SLuis R. Rodriguez struct ieee80211_hw *hw = NULL; 672203c4805SLuis R. Rodriguez struct ieee80211_hdr *hdr; 673203c4805SLuis R. Rodriguez int hdrlen, padsize, retval; 674203c4805SLuis R. Rodriguez bool decrypt_error = false; 675203c4805SLuis R. Rodriguez u8 keyix; 676203c4805SLuis R. Rodriguez __le16 fc; 677203c4805SLuis R. Rodriguez 678203c4805SLuis R. Rodriguez spin_lock_bh(&sc->rx.rxbuflock); 679203c4805SLuis R. Rodriguez 680203c4805SLuis R. Rodriguez do { 681203c4805SLuis R. Rodriguez /* If handling rx interrupt and flush is in progress => exit */ 682203c4805SLuis R. Rodriguez if ((sc->sc_flags & SC_OP_RXFLUSH) && (flush == 0)) 683203c4805SLuis R. Rodriguez break; 684203c4805SLuis R. Rodriguez 685203c4805SLuis R. Rodriguez if (list_empty(&sc->rx.rxbuf)) { 686203c4805SLuis R. Rodriguez sc->rx.rxlink = NULL; 687203c4805SLuis R. Rodriguez break; 688203c4805SLuis R. Rodriguez } 689203c4805SLuis R. Rodriguez 690203c4805SLuis R. Rodriguez bf = list_first_entry(&sc->rx.rxbuf, struct ath_buf, list); 691203c4805SLuis R. Rodriguez ds = bf->bf_desc; 692203c4805SLuis R. Rodriguez 693203c4805SLuis R. Rodriguez /* 694203c4805SLuis R. Rodriguez * Must provide the virtual address of the current 695203c4805SLuis R. Rodriguez * descriptor, the physical address, and the virtual 696203c4805SLuis R. Rodriguez * address of the next descriptor in the h/w chain. 697203c4805SLuis R. Rodriguez * This allows the HAL to look ahead to see if the 698203c4805SLuis R. Rodriguez * hardware is done with a descriptor by checking the 699203c4805SLuis R. Rodriguez * done bit in the following descriptor and the address 700203c4805SLuis R. Rodriguez * of the current descriptor the DMA engine is working 701203c4805SLuis R. Rodriguez * on. All this is necessary because of our use of 702203c4805SLuis R. Rodriguez * a self-linked list to avoid rx overruns. 703203c4805SLuis R. Rodriguez */ 704203c4805SLuis R. Rodriguez retval = ath9k_hw_rxprocdesc(ah, ds, 705203c4805SLuis R. Rodriguez bf->bf_daddr, 706203c4805SLuis R. Rodriguez PA2DESC(sc, ds->ds_link), 707203c4805SLuis R. Rodriguez 0); 708203c4805SLuis R. Rodriguez if (retval == -EINPROGRESS) { 709203c4805SLuis R. Rodriguez struct ath_buf *tbf; 710203c4805SLuis R. Rodriguez struct ath_desc *tds; 711203c4805SLuis R. Rodriguez 712203c4805SLuis R. Rodriguez if (list_is_last(&bf->list, &sc->rx.rxbuf)) { 713203c4805SLuis R. Rodriguez sc->rx.rxlink = NULL; 714203c4805SLuis R. Rodriguez break; 715203c4805SLuis R. Rodriguez } 716203c4805SLuis R. Rodriguez 717203c4805SLuis R. Rodriguez tbf = list_entry(bf->list.next, struct ath_buf, list); 718203c4805SLuis R. Rodriguez 719203c4805SLuis R. Rodriguez /* 720203c4805SLuis R. Rodriguez * On some hardware the descriptor status words could 721203c4805SLuis R. Rodriguez * get corrupted, including the done bit. Because of 722203c4805SLuis R. Rodriguez * this, check if the next descriptor's done bit is 723203c4805SLuis R. Rodriguez * set or not. 724203c4805SLuis R. Rodriguez * 725203c4805SLuis R. Rodriguez * If the next descriptor's done bit is set, the current 726203c4805SLuis R. Rodriguez * descriptor has been corrupted. Force s/w to discard 727203c4805SLuis R. Rodriguez * this descriptor and continue... 728203c4805SLuis R. Rodriguez */ 729203c4805SLuis R. Rodriguez 730203c4805SLuis R. Rodriguez tds = tbf->bf_desc; 731203c4805SLuis R. Rodriguez retval = ath9k_hw_rxprocdesc(ah, tds, tbf->bf_daddr, 732203c4805SLuis R. Rodriguez PA2DESC(sc, tds->ds_link), 0); 733203c4805SLuis R. Rodriguez if (retval == -EINPROGRESS) { 734203c4805SLuis R. Rodriguez break; 735203c4805SLuis R. Rodriguez } 736203c4805SLuis R. Rodriguez } 737203c4805SLuis R. Rodriguez 738203c4805SLuis R. Rodriguez skb = bf->bf_mpdu; 739203c4805SLuis R. Rodriguez if (!skb) 740203c4805SLuis R. Rodriguez continue; 741203c4805SLuis R. Rodriguez 742203c4805SLuis R. Rodriguez /* 743203c4805SLuis R. Rodriguez * Synchronize the DMA transfer with CPU before 744203c4805SLuis R. Rodriguez * 1. accessing the frame 745203c4805SLuis R. Rodriguez * 2. requeueing the same buffer to h/w 746203c4805SLuis R. Rodriguez */ 747203c4805SLuis R. Rodriguez dma_sync_single_for_cpu(sc->dev, bf->bf_buf_addr, 748203c4805SLuis R. Rodriguez sc->rx.bufsize, 749203c4805SLuis R. Rodriguez DMA_FROM_DEVICE); 750203c4805SLuis R. Rodriguez 751*b4afffc0SLuis R. Rodriguez hdr = (struct ieee80211_hdr *) skb->data; 752*b4afffc0SLuis R. Rodriguez hw = ath_get_virt_hw(sc, hdr); 753*b4afffc0SLuis R. Rodriguez 754203c4805SLuis R. Rodriguez /* 755203c4805SLuis R. Rodriguez * If we're asked to flush receive queue, directly 756203c4805SLuis R. Rodriguez * chain it back at the queue without processing it. 757203c4805SLuis R. Rodriguez */ 758203c4805SLuis R. Rodriguez if (flush) 759203c4805SLuis R. Rodriguez goto requeue; 760203c4805SLuis R. Rodriguez 761203c4805SLuis R. Rodriguez if (!ds->ds_rxstat.rs_datalen) 762203c4805SLuis R. Rodriguez goto requeue; 763203c4805SLuis R. Rodriguez 764203c4805SLuis R. Rodriguez /* The status portion of the descriptor could get corrupted. */ 765203c4805SLuis R. Rodriguez if (sc->rx.bufsize < ds->ds_rxstat.rs_datalen) 766203c4805SLuis R. Rodriguez goto requeue; 767203c4805SLuis R. Rodriguez 768*b4afffc0SLuis R. Rodriguez if (!ath_rx_prepare(hw, skb, ds, 769*b4afffc0SLuis R. Rodriguez &rx_status, &decrypt_error, sc)) 770203c4805SLuis R. Rodriguez goto requeue; 771203c4805SLuis R. Rodriguez 772203c4805SLuis R. Rodriguez /* Ensure we always have an skb to requeue once we are done 773203c4805SLuis R. Rodriguez * processing the current buffer's skb */ 77427c51f1aSLuis R. Rodriguez requeue_skb = ath_rxbuf_alloc(common, sc->rx.bufsize, GFP_ATOMIC); 775203c4805SLuis R. Rodriguez 776203c4805SLuis R. Rodriguez /* If there is no memory we ignore the current RX'd frame, 777203c4805SLuis R. Rodriguez * tell hardware it can give us a new frame using the old 778203c4805SLuis R. Rodriguez * skb and put it at the tail of the sc->rx.rxbuf list for 779203c4805SLuis R. Rodriguez * processing. */ 780203c4805SLuis R. Rodriguez if (!requeue_skb) 781203c4805SLuis R. Rodriguez goto requeue; 782203c4805SLuis R. Rodriguez 783203c4805SLuis R. Rodriguez /* Unmap the frame */ 784203c4805SLuis R. Rodriguez dma_unmap_single(sc->dev, bf->bf_buf_addr, 785203c4805SLuis R. Rodriguez sc->rx.bufsize, 786203c4805SLuis R. Rodriguez DMA_FROM_DEVICE); 787203c4805SLuis R. Rodriguez 788203c4805SLuis R. Rodriguez skb_put(skb, ds->ds_rxstat.rs_datalen); 789203c4805SLuis R. Rodriguez 790203c4805SLuis R. Rodriguez /* see if any padding is done by the hw and remove it */ 791203c4805SLuis R. Rodriguez hdrlen = ieee80211_get_hdrlen_from_skb(skb); 792203c4805SLuis R. Rodriguez fc = hdr->frame_control; 793203c4805SLuis R. Rodriguez 794203c4805SLuis R. Rodriguez /* The MAC header is padded to have 32-bit boundary if the 795203c4805SLuis R. Rodriguez * packet payload is non-zero. The general calculation for 796203c4805SLuis R. Rodriguez * padsize would take into account odd header lengths: 797203c4805SLuis R. Rodriguez * padsize = (4 - hdrlen % 4) % 4; However, since only 798203c4805SLuis R. Rodriguez * even-length headers are used, padding can only be 0 or 2 799203c4805SLuis R. Rodriguez * bytes and we can optimize this a bit. In addition, we must 800203c4805SLuis R. Rodriguez * not try to remove padding from short control frames that do 801203c4805SLuis R. Rodriguez * not have payload. */ 802203c4805SLuis R. Rodriguez padsize = hdrlen & 3; 803203c4805SLuis R. Rodriguez if (padsize && hdrlen >= 24) { 804203c4805SLuis R. Rodriguez memmove(skb->data + padsize, skb->data, hdrlen); 805203c4805SLuis R. Rodriguez skb_pull(skb, padsize); 806203c4805SLuis R. Rodriguez } 807203c4805SLuis R. Rodriguez 808203c4805SLuis R. Rodriguez keyix = ds->ds_rxstat.rs_keyix; 809203c4805SLuis R. Rodriguez 810203c4805SLuis R. Rodriguez if (!(keyix == ATH9K_RXKEYIX_INVALID) && !decrypt_error) { 811203c4805SLuis R. Rodriguez rx_status.flag |= RX_FLAG_DECRYPTED; 8129d64a3cfSJouni Malinen } else if (ieee80211_has_protected(fc) 813203c4805SLuis R. Rodriguez && !decrypt_error && skb->len >= hdrlen + 4) { 814203c4805SLuis R. Rodriguez keyix = skb->data[hdrlen + 3] >> 6; 815203c4805SLuis R. Rodriguez 816203c4805SLuis R. Rodriguez if (test_bit(keyix, sc->keymap)) 817203c4805SLuis R. Rodriguez rx_status.flag |= RX_FLAG_DECRYPTED; 818203c4805SLuis R. Rodriguez } 819203c4805SLuis R. Rodriguez if (ah->sw_mgmt_crypto && 820203c4805SLuis R. Rodriguez (rx_status.flag & RX_FLAG_DECRYPTED) && 8219d64a3cfSJouni Malinen ieee80211_is_mgmt(fc)) { 822203c4805SLuis R. Rodriguez /* Use software decrypt for management frames. */ 823203c4805SLuis R. Rodriguez rx_status.flag &= ~RX_FLAG_DECRYPTED; 824203c4805SLuis R. Rodriguez } 825203c4805SLuis R. Rodriguez 826203c4805SLuis R. Rodriguez /* We will now give hardware our shiny new allocated skb */ 827203c4805SLuis R. Rodriguez bf->bf_mpdu = requeue_skb; 828203c4805SLuis R. Rodriguez bf->bf_buf_addr = dma_map_single(sc->dev, requeue_skb->data, 829203c4805SLuis R. Rodriguez sc->rx.bufsize, 830203c4805SLuis R. Rodriguez DMA_FROM_DEVICE); 831203c4805SLuis R. Rodriguez if (unlikely(dma_mapping_error(sc->dev, 832203c4805SLuis R. Rodriguez bf->bf_buf_addr))) { 833203c4805SLuis R. Rodriguez dev_kfree_skb_any(requeue_skb); 834203c4805SLuis R. Rodriguez bf->bf_mpdu = NULL; 835c46917bbSLuis R. Rodriguez ath_print(common, ATH_DBG_FATAL, 836203c4805SLuis R. Rodriguez "dma_mapping_error() on RX\n"); 837*b4afffc0SLuis R. Rodriguez ath_rx_send_to_mac80211(hw, sc, skb, &rx_status); 838203c4805SLuis R. Rodriguez break; 839203c4805SLuis R. Rodriguez } 840203c4805SLuis R. Rodriguez bf->bf_dmacontext = bf->bf_buf_addr; 841203c4805SLuis R. Rodriguez 842203c4805SLuis R. Rodriguez /* 843203c4805SLuis R. Rodriguez * change the default rx antenna if rx diversity chooses the 844203c4805SLuis R. Rodriguez * other antenna 3 times in a row. 845203c4805SLuis R. Rodriguez */ 846203c4805SLuis R. Rodriguez if (sc->rx.defant != ds->ds_rxstat.rs_antenna) { 847203c4805SLuis R. Rodriguez if (++sc->rx.rxotherant >= 3) 848203c4805SLuis R. Rodriguez ath_setdefantenna(sc, ds->ds_rxstat.rs_antenna); 849203c4805SLuis R. Rodriguez } else { 850203c4805SLuis R. Rodriguez sc->rx.rxotherant = 0; 851203c4805SLuis R. Rodriguez } 852203c4805SLuis R. Rodriguez 8539a23f9caSJouni Malinen if (unlikely(sc->sc_flags & (SC_OP_WAIT_FOR_BEACON | 854f0e9a860SGabor Juhos SC_OP_WAIT_FOR_CAB | 8559a23f9caSJouni Malinen SC_OP_WAIT_FOR_PSPOLL_DATA))) 856cc65965cSJouni Malinen ath_rx_ps(sc, skb); 857cc65965cSJouni Malinen 858*b4afffc0SLuis R. Rodriguez ath_rx_send_to_mac80211(hw, sc, skb, &rx_status); 859cc65965cSJouni Malinen 860203c4805SLuis R. Rodriguez requeue: 861203c4805SLuis R. Rodriguez list_move_tail(&bf->list, &sc->rx.rxbuf); 862203c4805SLuis R. Rodriguez ath_rx_buf_link(sc, bf); 863203c4805SLuis R. Rodriguez } while (1); 864203c4805SLuis R. Rodriguez 865203c4805SLuis R. Rodriguez spin_unlock_bh(&sc->rx.rxbuflock); 866203c4805SLuis R. Rodriguez 867203c4805SLuis R. Rodriguez return 0; 868203c4805SLuis R. Rodriguez #undef PA2DESC 869203c4805SLuis R. Rodriguez } 870