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,
  48                           const struct htt_tx_done *tx_done)
  49 {
  50         struct device *dev = htt->ar->dev;
  51         struct ieee80211_tx_info *info;
  52         struct ath10k_skb_cb *skb_cb;
  53         struct sk_buff *msdu;
  54         int ret;
  55
  56         ath10k_dbg(ATH10K_DBG_HTT, "htt tx completion msdu_id %u discard %d no_ack %d\n",
  57                    tx_done->msdu_id, !!tx_done->discard, !!tx_done->no_ack);
  58
  59         if (tx_done->msdu_id >= htt->max_num_pending_tx) {
  60                 ath10k_warn("warning: msdu_id %d too big, ignoring\n",
  61                             tx_done->msdu_id);
  62                 return;
  63         }
  64
  65         msdu = htt->pending_tx[tx_done->msdu_id];
  66         skb_cb = ATH10K_SKB_CB(msdu);
  67
  68         ret = ath10k_skb_unmap(dev, msdu);
  69         if (ret)
  70                 ath10k_warn("data skb unmap failed (%d)\n", ret);
  71
  72         if (skb_cb->htt.frag_len)
  73                 skb_pull(msdu, skb_cb->htt.frag_len + skb_cb->htt.pad_len);
  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 (tx_done->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 (tx_done->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[tx_done->msdu_id] = NULL;
  97         ath10k_htt_tx_free_msdu_id(htt, tx_done->msdu_id);
  98         __ath10k_htt_tx_dec_pending(htt);
  99         if (htt->num_pending_tx == 0)
 100                 wake_up(&htt->empty_tx_wq);
 101         spin_unlock_bh(&htt->tx_lock);
 102 }
 103
 104 static const u8 rx_legacy_rate_idx[] = {
 105         3,      /* 0x00  - 11Mbps  */
 106         2,      /* 0x01  - 5.5Mbps */
 107         1,      /* 0x02  - 2Mbps   */
 108         0,      /* 0x03  - 1Mbps   */
 109         3,      /* 0x04  - 11Mbps  */
 110         2,      /* 0x05  - 5.5Mbps */
 111         1,      /* 0x06  - 2Mbps   */
 112         0,      /* 0x07  - 1Mbps   */
 113         10,     /* 0x08  - 48Mbps  */
 114         8,      /* 0x09  - 24Mbps  */
 115         6,      /* 0x0A  - 12Mbps  */
 116         4,      /* 0x0B  - 6Mbps   */
 117         11,     /* 0x0C  - 54Mbps  */
 118         9,      /* 0x0D  - 36Mbps  */
 119         7,      /* 0x0E  - 18Mbps  */
 120         5,      /* 0x0F  - 9Mbps   */
 121 };
 122
 123 static void process_rx_rates(struct ath10k *ar, struct htt_rx_info *info,
 124                              enum ieee80211_band band,
 125                              struct ieee80211_rx_status *status)
 126 {
 127         u8 cck, rate, rate_idx, bw, sgi, mcs, nss;
 128         u8 info0 = info->rate.info0;
 129         u32 info1 = info->rate.info1;
 130         u32 info2 = info->rate.info2;
 131         u8 preamble = 0;
 132
 133         /* Check if valid fields */
 134         if (!(info0 & HTT_RX_INDICATION_INFO0_START_VALID))
 135                 return;
 136
 137         preamble = MS(info1, HTT_RX_INDICATION_INFO1_PREAMBLE_TYPE);
 138
 139         switch (preamble) {
 140         case HTT_RX_LEGACY:
 141                 cck = info0 & HTT_RX_INDICATION_INFO0_LEGACY_RATE_CCK;
 142                 rate = MS(info0, HTT_RX_INDICATION_INFO0_LEGACY_RATE);
 143                 rate_idx = 0;
 144
 145                 if (rate < 0x08 || rate > 0x0F)
 146                         break;
 147
 148                 switch (band) {
 149                 case IEEE80211_BAND_2GHZ:
 150                         if (cck)
 151                                 rate &= ~BIT(3);
 152                         rate_idx = rx_legacy_rate_idx[rate];
 153                         break;
 154                 case IEEE80211_BAND_5GHZ:
 155                         rate_idx = rx_legacy_rate_idx[rate];
 156                         /* We are using same rate table registering
 157                            HW - ath10k_rates[]. In case of 5GHz skip
 158                            CCK rates, so -4 here */
 159                         rate_idx -= 4;
 160                         break;
 161                 default:
 162                         break;
 163                 }
 164
 165                 status->rate_idx = rate_idx;
 166                 break;
 167         case HTT_RX_HT:
 168         case HTT_RX_HT_WITH_TXBF:
 169                 /* HT-SIG - Table 20-11 in info1 and info2 */
 170                 mcs = info1 & 0x1F;
 171                 nss = mcs >> 3;
 172                 bw = (info1 >> 7) & 1;
 173                 sgi = (info2 >> 7) & 1;
 174
 175                 status->rate_idx = mcs;
 176                 status->flag |= RX_FLAG_HT;
 177                 if (sgi)
 178                         status->flag |= RX_FLAG_SHORT_GI;
 179                 if (bw)
 180                         status->flag |= RX_FLAG_40MHZ;
 181                 break;
 182         case HTT_RX_VHT:
 183         case HTT_RX_VHT_WITH_TXBF:
 184                 /* VHT-SIG-A1 in info 1, VHT-SIG-A2 in info2
 185                    TODO check this */
 186                 mcs = (info2 >> 4) & 0x0F;
 187                 nss = ((info1 >> 10) & 0x07) + 1;
 188                 bw = info1 & 3;
 189                 sgi = info2 & 1;
 190
 191                 status->rate_idx = mcs;
 192                 status->vht_nss = nss;
 193
 194                 if (sgi)
 195                         status->flag |= RX_FLAG_SHORT_GI;
 196
 197                 switch (bw) {
 198                 /* 20MHZ */
 199                 case 0:
 200                         break;
 201                 /* 40MHZ */
 202                 case 1:
 203                         status->flag |= RX_FLAG_40MHZ;
 204                         break;
 205                 /* 80MHZ */
 206                 case 2:
 207                         status->flag |= RX_FLAG_80MHZ;
 208                 }
 209
 210                 status->flag |= RX_FLAG_VHT;
 211                 break;
 212         default:
 213                 break;
 214         }
 215 }
 216
 217 void ath10k_process_rx(struct ath10k *ar, struct htt_rx_info *info)
 218 {
 219         struct ieee80211_rx_status *status;
 220         struct ieee80211_channel *ch;
 221         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)info->skb->data;
 222
 223         status = IEEE80211_SKB_RXCB(info->skb);
 224         memset(status, 0, sizeof(*status));
 225
 226         if (info->encrypt_type != HTT_RX_MPDU_ENCRYPT_NONE) {
 227                 status->flag |= RX_FLAG_DECRYPTED | RX_FLAG_IV_STRIPPED |
 228                                 RX_FLAG_MMIC_STRIPPED;
 229                 hdr->frame_control = __cpu_to_le16(
 230                                 __le16_to_cpu(hdr->frame_control) &
 231                                 ~IEEE80211_FCTL_PROTECTED);
 232         }
 233
 234         if (info->mic_err)
 235                 status->flag |= RX_FLAG_MMIC_ERROR;
 236
 237         if (info->fcs_err)
 238                 status->flag |= RX_FLAG_FAILED_FCS_CRC;
 239
 240         if (info->amsdu_more)
 241                 status->flag |= RX_FLAG_AMSDU_MORE;
 242
 243         status->signal = info->signal;
 244
 245         spin_lock_bh(&ar->data_lock);
 246         ch = ar->scan_channel;
 247         if (!ch)
 248                 ch = ar->rx_channel;
 249         spin_unlock_bh(&ar->data_lock);
 250
 251         if (!ch) {
 252                 ath10k_warn("no channel configured; ignoring frame!\n");
 253                 dev_kfree_skb_any(info->skb);
 254                 return;
 255         }
 256
 257         process_rx_rates(ar, info, ch->band, status);
 258         status->band = ch->band;
 259         status->freq = ch->center_freq;
 260
 261         ath10k_dbg(ATH10K_DBG_DATA,
 262                    "rx skb %p len %u %s%s%s%s%s %srate_idx %u vht_nss %u freq %u band %u\n",
 263                    info->skb,
 264                    info->skb->len,
 265                    status->flag == 0 ? "legacy" : "",
 266                    status->flag & RX_FLAG_HT ? "ht" : "",
 267                    status->flag & RX_FLAG_VHT ? "vht" : "",
 268                    status->flag & RX_FLAG_40MHZ ? "40" : "",
 269                    status->flag & RX_FLAG_80MHZ ? "80" : "",
 270                    status->flag & RX_FLAG_SHORT_GI ? "sgi " : "",
 271                    status->rate_idx,
 272                    status->vht_nss,
 273                    status->freq,
 274                    status->band);
 275         ath10k_dbg_dump(ATH10K_DBG_HTT_DUMP, NULL, "rx skb: ",
 276                         info->skb->data, info->skb->len);
 277
 278         ieee80211_rx(ar->hw, info->skb);
 279 }
 280
 281 struct ath10k_peer *ath10k_peer_find(struct ath10k *ar, int vdev_id,
 282                                      const u8 *addr)
 283 {
 284         struct ath10k_peer *peer;
 285
 286         lockdep_assert_held(&ar->data_lock);
 287
 288         list_for_each_entry(peer, &ar->peers, list) {
 289                 if (peer->vdev_id != vdev_id)
 290                         continue;
 291                 if (memcmp(peer->addr, addr, ETH_ALEN))
 292                         continue;
 293
 294                 return peer;
 295         }
 296
 297         return NULL;
 298 }
 299
 300 static struct ath10k_peer *ath10k_peer_find_by_id(struct ath10k *ar,
 301                                                   int peer_id)
 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 (test_bit(peer_id, peer->peer_ids))
 309                         return peer;
 310
 311         return NULL;
 312 }
 313
 314 static int ath10k_wait_for_peer_common(struct ath10k *ar, int vdev_id,
 315                                        const u8 *addr, bool expect_mapped)
 316 {
 317         int ret;
 318
 319         ret = wait_event_timeout(ar->peer_mapping_wq, ({
 320                         bool mapped;
 321
 322                         spin_lock_bh(&ar->data_lock);
 323                         mapped = !!ath10k_peer_find(ar, vdev_id, addr);
 324                         spin_unlock_bh(&ar->data_lock);
 325
 326                         mapped == expect_mapped;
 327                 }), 3*HZ);
 328
 329         if (ret <= 0)
 330                 return -ETIMEDOUT;
 331
 332         return 0;
 333 }
 334
 335 int ath10k_wait_for_peer_created(struct ath10k *ar, int vdev_id, const u8 *addr)
 336 {
 337         return ath10k_wait_for_peer_common(ar, vdev_id, addr, true);
 338 }
 339
 340 int ath10k_wait_for_peer_deleted(struct ath10k *ar, int vdev_id, const u8 *addr)
 341 {
 342         return ath10k_wait_for_peer_common(ar, vdev_id, addr, false);
 343 }
 344
 345 void ath10k_peer_map_event(struct ath10k_htt *htt,
 346                            struct htt_peer_map_event *ev)
 347 {
 348         struct ath10k *ar = htt->ar;
 349         struct ath10k_peer *peer;
 350
 351         spin_lock_bh(&ar->data_lock);
 352         peer = ath10k_peer_find(ar, ev->vdev_id, ev->addr);
 353         if (!peer) {
 354                 peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
 355                 if (!peer)
 356                         goto exit;
 357
 358                 peer->vdev_id = ev->vdev_id;
 359                 memcpy(peer->addr, ev->addr, ETH_ALEN);
 360                 list_add(&peer->list, &ar->peers);
 361                 wake_up(&ar->peer_mapping_wq);
 362         }
 363
 364         ath10k_dbg(ATH10K_DBG_HTT, "htt peer map vdev %d peer %pM id %d\n",
 365                    ev->vdev_id, ev->addr, ev->peer_id);
 366
 367         set_bit(ev->peer_id, peer->peer_ids);
 368 exit:
 369         spin_unlock_bh(&ar->data_lock);
 370 }
 371
 372 void ath10k_peer_unmap_event(struct ath10k_htt *htt,
 373                              struct htt_peer_unmap_event *ev)
 374 {
 375         struct ath10k *ar = htt->ar;
 376         struct ath10k_peer *peer;
 377
 378         spin_lock_bh(&ar->data_lock);
 379         peer = ath10k_peer_find_by_id(ar, ev->peer_id);
 380         if (!peer) {
 381                 ath10k_warn("unknown peer id %d\n", ev->peer_id);
 382                 goto exit;
 383         }
 384
 385         ath10k_dbg(ATH10K_DBG_HTT, "htt peer unmap vdev %d peer %pM id %d\n",
 386                    peer->vdev_id, peer->addr, ev->peer_id);
 387
 388         clear_bit(ev->peer_id, peer->peer_ids);
 389
 390         if (bitmap_empty(peer->peer_ids, ATH10K_MAX_NUM_PEER_IDS)) {
 391                 list_del(&peer->list);
 392                 kfree(peer);
 393                 wake_up(&ar->peer_mapping_wq);
 394         }
 395
 396 exit:
 397         spin_unlock_bh(&ar->data_lock);
 398 }