drivers/net/wireless/ath/ath10k/txrx.c

   1 /*
   2  * Copyright (c) 2005-2011 Atheros Communications Inc.
   3  * Copyright (c) 2011-2013 Qualcomm Atheros, Inc.
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #include "core.h"
  19 #include "txrx.h"
  20 #include "htt.h"
  21 #include "mac.h"
  22 #include "debug.h"
  23
  24 static void ath10k_report_offchan_tx(struct ath10k *ar, struct sk_buff *skb)
  25 {
  26         if (!ATH10K_SKB_CB(skb)->htt.is_offchan)
  27                 return;
  28
  29         /* If the original wait_for_completion() timed out before
  30          * {data,mgmt}_tx_completed() was called then we could complete
  31          * offchan_tx_completed for a different skb. Prevent this by using
  32          * offchan_tx_skb. */
  33         spin_lock_bh(&ar->data_lock);
  34         if (ar->offchan_tx_skb != skb) {
  35                 ath10k_warn("completed old offchannel frame\n");
  36                 goto out;
  37         }
  38
  39         complete(&ar->offchan_tx_completed);
  40         ar->offchan_tx_skb = NULL; /* just for sanity */
  41
  42         ath10k_dbg(ATH10K_DBG_HTT, "completed offchannel skb %p\n", skb);
  43 out:
  44         spin_unlock_bh(&ar->data_lock);
  45 }
  46
  47 void ath10k_txrx_tx_unref(struct ath10k_htt *htt, struct sk_buff *txdesc)
  48 {
  49         struct device *dev = htt->ar->dev;
  50         struct ieee80211_tx_info *info;
  51         struct sk_buff *txfrag = ATH10K_SKB_CB(txdesc)->htt.txfrag;
  52         struct sk_buff *msdu = ATH10K_SKB_CB(txdesc)->htt.msdu;
  53         int ret;
  54
  55         if (ATH10K_SKB_CB(txdesc)->htt.refcount == 0)
  56                 return;
  57
  58         ATH10K_SKB_CB(txdesc)->htt.refcount--;
  59
  60         if (ATH10K_SKB_CB(txdesc)->htt.refcount > 0)
  61                 return;
  62
  63         if (txfrag) {
  64                 ret = ath10k_skb_unmap(dev, txfrag);
  65                 if (ret)
  66                         ath10k_warn("txfrag unmap failed (%d)\n", ret);
  67
  68                 dev_kfree_skb_any(txfrag);
  69         }
  70
  71         ret = ath10k_skb_unmap(dev, msdu);
  72         if (ret)
  73                 ath10k_warn("data skb unmap failed (%d)\n", ret);
  74
  75         ath10k_report_offchan_tx(htt->ar, msdu);
  76
  77         info = IEEE80211_SKB_CB(msdu);
  78         memset(&info->status, 0, sizeof(info->status));
  79
  80         if (ATH10K_SKB_CB(txdesc)->htt.discard) {
  81                 ieee80211_free_txskb(htt->ar->hw, msdu);
  82                 goto exit;
  83         }
  84
  85         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
  86                 info->flags |= IEEE80211_TX_STAT_ACK;
  87
  88         if (ATH10K_SKB_CB(txdesc)->htt.no_ack)
  89                 info->flags &= ~IEEE80211_TX_STAT_ACK;
  90
  91         ieee80211_tx_status(htt->ar->hw, msdu);
  92         /* we do not own the msdu anymore */
  93
  94 exit:
  95         spin_lock_bh(&htt->tx_lock);
  96         htt->pending_tx[ATH10K_SKB_CB(txdesc)->htt.msdu_id] = NULL;
  97         ath10k_htt_tx_free_msdu_id(htt, ATH10K_SKB_CB(txdesc)->htt.msdu_id);
  98         __ath10k_htt_tx_dec_pending(htt);
  99         if (bitmap_empty(htt->used_msdu_ids, htt->max_num_pending_tx))
 100                 wake_up(&htt->empty_tx_wq);
 101         spin_unlock_bh(&htt->tx_lock);
 102
 103         dev_kfree_skb_any(txdesc);
 104 }
 105
 106 void ath10k_txrx_tx_completed(struct ath10k_htt *htt,
 107                               const struct htt_tx_done *tx_done)
 108 {
 109         struct sk_buff *txdesc;
 110
 111         ath10k_dbg(ATH10K_DBG_HTT, "htt tx completion msdu_id %u discard %d no_ack %d\n",
 112                    tx_done->msdu_id, !!tx_done->discard, !!tx_done->no_ack);
 113
 114         if (tx_done->msdu_id >= htt->max_num_pending_tx) {
 115                 ath10k_warn("warning: msdu_id %d too big, ignoring\n",
 116                             tx_done->msdu_id);
 117                 return;
 118         }
 119
 120         txdesc = htt->pending_tx[tx_done->msdu_id];
 121
 122         ATH10K_SKB_CB(txdesc)->htt.discard = tx_done->discard;
 123         ATH10K_SKB_CB(txdesc)->htt.no_ack = tx_done->no_ack;
 124
 125         ath10k_txrx_tx_unref(htt, txdesc);
 126 }
 127
 128 static const u8 rx_legacy_rate_idx[] = {
 129         3,      /* 0x00  - 11Mbps  */
 130         2,      /* 0x01  - 5.5Mbps */
 131         1,      /* 0x02  - 2Mbps   */
 132         0,      /* 0x03  - 1Mbps   */
 133         3,      /* 0x04  - 11Mbps  */
 134         2,      /* 0x05  - 5.5Mbps */
 135         1,      /* 0x06  - 2Mbps   */
 136         0,      /* 0x07  - 1Mbps   */
 137         10,     /* 0x08  - 48Mbps  */
 138         8,      /* 0x09  - 24Mbps  */
 139         6,      /* 0x0A  - 12Mbps  */
 140         4,      /* 0x0B  - 6Mbps   */
 141         11,     /* 0x0C  - 54Mbps  */
 142         9,      /* 0x0D  - 36Mbps  */
 143         7,      /* 0x0E  - 18Mbps  */
 144         5,      /* 0x0F  - 9Mbps   */
 145 };
 146
 147 static void process_rx_rates(struct ath10k *ar, struct htt_rx_info *info,
 148                              enum ieee80211_band band,
 149                              struct ieee80211_rx_status *status)
 150 {
 151         u8 cck, rate, rate_idx, bw, sgi, mcs, nss;
 152         u8 info0 = info->rate.info0;
 153         u32 info1 = info->rate.info1;
 154         u32 info2 = info->rate.info2;
 155         u8 preamble = 0;
 156
 157         /* Check if valid fields */
 158         if (!(info0 & HTT_RX_INDICATION_INFO0_START_VALID))
 159                 return;
 160
 161         preamble = MS(info1, HTT_RX_INDICATION_INFO1_PREAMBLE_TYPE);
 162
 163         switch (preamble) {
 164         case HTT_RX_LEGACY:
 165                 cck = info0 & HTT_RX_INDICATION_INFO0_LEGACY_RATE_CCK;
 166                 rate = MS(info0, HTT_RX_INDICATION_INFO0_LEGACY_RATE);
 167                 rate_idx = 0;
 168
 169                 if (rate < 0x08 || rate > 0x0F)
 170                         break;
 171
 172                 switch (band) {
 173                 case IEEE80211_BAND_2GHZ:
 174                         if (cck)
 175                                 rate &= ~BIT(3);
 176                         rate_idx = rx_legacy_rate_idx[rate];
 177                         break;
 178                 case IEEE80211_BAND_5GHZ:
 179                         rate_idx = rx_legacy_rate_idx[rate];
 180                         /* We are using same rate table registering
 181                            HW - ath10k_rates[]. In case of 5GHz skip
 182                            CCK rates, so -4 here */
 183                         rate_idx -= 4;
 184                         break;
 185                 default:
 186                         break;
 187                 }
 188
 189                 status->rate_idx = rate_idx;
 190                 break;
 191         case HTT_RX_HT:
 192         case HTT_RX_HT_WITH_TXBF:
 193                 /* HT-SIG - Table 20-11 in info1 and info2 */
 194                 mcs = info1 & 0x1F;
 195                 nss = mcs >> 3;
 196                 bw = (info1 >> 7) & 1;
 197                 sgi = (info2 >> 7) & 1;
 198
 199                 status->rate_idx = mcs;
 200                 status->flag |= RX_FLAG_HT;
 201                 if (sgi)
 202                         status->flag |= RX_FLAG_SHORT_GI;
 203                 if (bw)
 204                         status->flag |= RX_FLAG_40MHZ;
 205                 break;
 206         case HTT_RX_VHT:
 207         case HTT_RX_VHT_WITH_TXBF:
 208                 /* VHT-SIG-A1 in info 1, VHT-SIG-A2 in info2
 209                    TODO check this */
 210                 mcs = (info2 >> 4) & 0x0F;
 211                 nss = (info1 >> 10) & 0x07;
 212                 bw = info1 & 3;
 213                 sgi = info2 & 1;
 214
 215                 status->rate_idx = mcs;
 216                 status->vht_nss = nss;
 217
 218                 if (sgi)
 219                         status->flag |= RX_FLAG_SHORT_GI;
 220
 221                 switch (bw) {
 222                 /* 20MHZ */
 223                 case 0:
 224                         break;
 225                 /* 40MHZ */
 226                 case 1:
 227                         status->flag |= RX_FLAG_40MHZ;
 228                         break;
 229                 /* 80MHZ */
 230                 case 2:
 231                         status->flag |= RX_FLAG_80MHZ;
 232                 }
 233
 234                 status->flag |= RX_FLAG_VHT;
 235                 break;
 236         default:
 237                 break;
 238         }
 239 }
 240
 241 void ath10k_process_rx(struct ath10k *ar, struct htt_rx_info *info)
 242 {
 243         struct ieee80211_rx_status *status;
 244         struct ieee80211_channel *ch;
 245         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)info->skb->data;
 246
 247         status = IEEE80211_SKB_RXCB(info->skb);
 248         memset(status, 0, sizeof(*status));
 249
 250         if (info->encrypt_type != HTT_RX_MPDU_ENCRYPT_NONE) {
 251                 status->flag |= RX_FLAG_DECRYPTED | RX_FLAG_IV_STRIPPED |
 252                                 RX_FLAG_MMIC_STRIPPED;
 253                 hdr->frame_control = __cpu_to_le16(
 254                                 __le16_to_cpu(hdr->frame_control) &
 255                                 ~IEEE80211_FCTL_PROTECTED);
 256         }
 257
 258         if (info->status == HTT_RX_IND_MPDU_STATUS_TKIP_MIC_ERR)
 259                 status->flag |= RX_FLAG_MMIC_ERROR;
 260
 261         if (info->fcs_err)
 262                 status->flag |= RX_FLAG_FAILED_FCS_CRC;
 263
 264         status->signal = info->signal;
 265
 266         spin_lock_bh(&ar->data_lock);
 267         ch = ar->scan_channel;
 268         if (!ch)
 269                 ch = ar->rx_channel;
 270         spin_unlock_bh(&ar->data_lock);
 271
 272         if (!ch) {
 273                 ath10k_warn("no channel configured; ignoring frame!\n");
 274                 dev_kfree_skb_any(info->skb);
 275                 return;
 276         }
 277
 278         process_rx_rates(ar, info, ch->band, status);
 279         status->band = ch->band;
 280         status->freq = ch->center_freq;
 281
 282         ath10k_dbg(ATH10K_DBG_DATA,
 283                    "rx skb %p len %u %s%s%s%s%s %srate_idx %u vht_nss %u freq %u band %u\n",
 284                    info->skb,
 285                    info->skb->len,
 286                    status->flag == 0 ? "legacy" : "",
 287                    status->flag & RX_FLAG_HT ? "ht" : "",
 288                    status->flag & RX_FLAG_VHT ? "vht" : "",
 289                    status->flag & RX_FLAG_40MHZ ? "40" : "",
 290                    status->flag & RX_FLAG_80MHZ ? "80" : "",
 291                    status->flag & RX_FLAG_SHORT_GI ? "sgi " : "",
 292                    status->rate_idx,
 293                    status->vht_nss,
 294                    status->freq,
 295                    status->band);
 296
 297         ieee80211_rx(ar->hw, info->skb);
 298 }
 299
 300 struct ath10k_peer *ath10k_peer_find(struct ath10k *ar, int vdev_id,
 301                                      const u8 *addr)
 302 {
 303         struct ath10k_peer *peer;
 304
 305         lockdep_assert_held(&ar->data_lock);
 306
 307         list_for_each_entry(peer, &ar->peers, list) {
 308                 if (peer->vdev_id != vdev_id)
 309                         continue;
 310                 if (memcmp(peer->addr, addr, ETH_ALEN))
 311                         continue;
 312
 313                 return peer;
 314         }
 315
 316         return NULL;
 317 }
 318
 319 static struct ath10k_peer *ath10k_peer_find_by_id(struct ath10k *ar,
 320                                                   int peer_id)
 321 {
 322         struct ath10k_peer *peer;
 323
 324         lockdep_assert_held(&ar->data_lock);
 325
 326         list_for_each_entry(peer, &ar->peers, list)
 327                 if (test_bit(peer_id, peer->peer_ids))
 328                         return peer;
 329
 330         return NULL;
 331 }
 332
 333 static int ath10k_wait_for_peer_common(struct ath10k *ar, int vdev_id,
 334                                        const u8 *addr, bool expect_mapped)
 335 {
 336         int ret;
 337
 338         ret = wait_event_timeout(ar->peer_mapping_wq, ({
 339                         bool mapped;
 340
 341                         spin_lock_bh(&ar->data_lock);
 342                         mapped = !!ath10k_peer_find(ar, vdev_id, addr);
 343                         spin_unlock_bh(&ar->data_lock);
 344
 345                         mapped == expect_mapped;
 346                 }), 3*HZ);
 347
 348         if (ret <= 0)
 349                 return -ETIMEDOUT;
 350
 351         return 0;
 352 }
 353
 354 int ath10k_wait_for_peer_created(struct ath10k *ar, int vdev_id, const u8 *addr)
 355 {
 356         return ath10k_wait_for_peer_common(ar, vdev_id, addr, true);
 357 }
 358
 359 int ath10k_wait_for_peer_deleted(struct ath10k *ar, int vdev_id, const u8 *addr)
 360 {
 361         return ath10k_wait_for_peer_common(ar, vdev_id, addr, false);
 362 }
 363
 364 void ath10k_peer_map_event(struct ath10k_htt *htt,
 365                            struct htt_peer_map_event *ev)
 366 {
 367         struct ath10k *ar = htt->ar;
 368         struct ath10k_peer *peer;
 369
 370         spin_lock_bh(&ar->data_lock);
 371         peer = ath10k_peer_find(ar, ev->vdev_id, ev->addr);
 372         if (!peer) {
 373                 peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
 374                 if (!peer)
 375                         goto exit;
 376
 377                 peer->vdev_id = ev->vdev_id;
 378                 memcpy(peer->addr, ev->addr, ETH_ALEN);
 379                 list_add(&peer->list, &ar->peers);
 380                 wake_up(&ar->peer_mapping_wq);
 381         }
 382
 383         ath10k_dbg(ATH10K_DBG_HTT, "htt peer map vdev %d peer %pM id %d\n",
 384                    ev->vdev_id, ev->addr, ev->peer_id);
 385
 386         set_bit(ev->peer_id, peer->peer_ids);
 387 exit:
 388         spin_unlock_bh(&ar->data_lock);
 389 }
 390
 391 void ath10k_peer_unmap_event(struct ath10k_htt *htt,
 392                              struct htt_peer_unmap_event *ev)
 393 {
 394         struct ath10k *ar = htt->ar;
 395         struct ath10k_peer *peer;
 396
 397         spin_lock_bh(&ar->data_lock);
 398         peer = ath10k_peer_find_by_id(ar, ev->peer_id);
 399         if (!peer) {
 400                 ath10k_warn("unknown peer id %d\n", ev->peer_id);
 401                 goto exit;
 402         }
 403
 404         ath10k_dbg(ATH10K_DBG_HTT, "htt peer unmap vdev %d peer %pM id %d\n",
 405                    peer->vdev_id, peer->addr, ev->peer_id);
 406
 407         clear_bit(ev->peer_id, peer->peer_ids);
 408
 409         if (bitmap_empty(peer->peer_ids, ATH10K_MAX_NUM_PEER_IDS)) {
 410                 list_del(&peer->list);
 411                 kfree(peer);
 412                 wake_up(&ar->peer_mapping_wq);
 413         }
 414
 415 exit:
 416         spin_unlock_bh(&ar->data_lock);
 417 }