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

   1 /*
   2  * Copyright (c) 2005-2011 Atheros Communications Inc.
   3  * Copyright (c) 2011-2016 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         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  27
  28         if (likely(!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN)))
  29                 return;
  30
  31         if (ath10k_mac_tx_frm_has_freq(ar))
  32                 return;
  33
  34         /* If the original wait_for_completion() timed out before
  35          * {data,mgmt}_tx_completed() was called then we could complete
  36          * offchan_tx_completed for a different skb. Prevent this by using
  37          * offchan_tx_skb.
  38          */
  39         spin_lock_bh(&ar->data_lock);
  40         if (ar->offchan_tx_skb != skb) {
  41                 ath10k_warn(ar, "completed old offchannel frame\n");
  42                 goto out;
  43         }
  44
  45         complete(&ar->offchan_tx_completed);
  46         ar->offchan_tx_skb = NULL; /* just for sanity */
  47
  48         ath10k_dbg(ar, ATH10K_DBG_HTT, "completed offchannel skb %pK\n", skb);
  49 out:
  50         spin_unlock_bh(&ar->data_lock);
  51 }
  52
  53 int ath10k_txrx_tx_unref(struct ath10k_htt *htt,
  54                          const struct htt_tx_done *tx_done)
  55 {
  56         struct ath10k *ar = htt->ar;
  57         struct device *dev = ar->dev;
  58         struct ieee80211_tx_info *info;
  59         struct ieee80211_txq *txq;
  60         struct ath10k_skb_cb *skb_cb;
  61         struct ath10k_txq *artxq;
  62         struct sk_buff *msdu;
  63
  64         ath10k_dbg(ar, ATH10K_DBG_HTT,
  65                    "htt tx completion msdu_id %u status %d\n",
  66                    tx_done->msdu_id, tx_done->status);
  67
  68         if (tx_done->msdu_id >= htt->max_num_pending_tx) {
  69                 ath10k_warn(ar, "warning: msdu_id %d too big, ignoring\n",
  70                             tx_done->msdu_id);
  71                 return -EINVAL;
  72         }
  73
  74         spin_lock_bh(&htt->tx_lock);
  75         msdu = idr_find(&htt->pending_tx, tx_done->msdu_id);
  76         if (!msdu) {
  77                 ath10k_warn(ar, "received tx completion for invalid msdu_id: %d\n",
  78                             tx_done->msdu_id);
  79                 spin_unlock_bh(&htt->tx_lock);
  80                 return -ENOENT;
  81         }
  82
  83         skb_cb = ATH10K_SKB_CB(msdu);
  84         txq = skb_cb->txq;
  85
  86         if (txq) {
  87                 artxq = (void *)txq->drv_priv;
  88                 artxq->num_fw_queued--;
  89         }
  90
  91         ath10k_htt_tx_free_msdu_id(htt, tx_done->msdu_id);
  92         ath10k_htt_tx_dec_pending(htt);
  93         if (htt->num_pending_tx == 0)
  94                 wake_up(&htt->empty_tx_wq);
  95         spin_unlock_bh(&htt->tx_lock);
  96
  97         dma_unmap_single(dev, skb_cb->paddr, msdu->len, DMA_TO_DEVICE);
  98
  99         ath10k_report_offchan_tx(htt->ar, msdu);
 100
 101         info = IEEE80211_SKB_CB(msdu);
 102         memset(&info->status, 0, sizeof(info->status));
 103         trace_ath10k_txrx_tx_unref(ar, tx_done->msdu_id);
 104
 105         if (tx_done->status == HTT_TX_COMPL_STATE_DISCARD) {
 106                 ieee80211_free_txskb(htt->ar->hw, msdu);
 107                 return 0;
 108         }
 109
 110         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
 111                 info->flags |= IEEE80211_TX_STAT_ACK;
 112
 113         if (tx_done->status == HTT_TX_COMPL_STATE_NOACK)
 114                 info->flags &= ~IEEE80211_TX_STAT_ACK;
 115
 116         if ((tx_done->status == HTT_TX_COMPL_STATE_ACK) &&
 117             (info->flags & IEEE80211_TX_CTL_NO_ACK))
 118                 info->flags |= IEEE80211_TX_STAT_NOACK_TRANSMITTED;
 119
 120         ieee80211_tx_status(htt->ar->hw, msdu);
 121         /* we do not own the msdu anymore */
 122
 123         return 0;
 124 }
 125
 126 struct ath10k_peer *ath10k_peer_find(struct ath10k *ar, int vdev_id,
 127                                      const u8 *addr)
 128 {
 129         struct ath10k_peer *peer;
 130
 131         lockdep_assert_held(&ar->data_lock);
 132
 133         list_for_each_entry(peer, &ar->peers, list) {
 134                 if (peer->vdev_id != vdev_id)
 135                         continue;
 136                 if (!ether_addr_equal(peer->addr, addr))
 137                         continue;
 138
 139                 return peer;
 140         }
 141
 142         return NULL;
 143 }
 144
 145 struct ath10k_peer *ath10k_peer_find_by_id(struct ath10k *ar, int peer_id)
 146 {
 147         struct ath10k_peer *peer;
 148
 149         lockdep_assert_held(&ar->data_lock);
 150
 151         list_for_each_entry(peer, &ar->peers, list)
 152                 if (test_bit(peer_id, peer->peer_ids))
 153                         return peer;
 154
 155         return NULL;
 156 }
 157
 158 static int ath10k_wait_for_peer_common(struct ath10k *ar, int vdev_id,
 159                                        const u8 *addr, bool expect_mapped)
 160 {
 161         long time_left;
 162
 163         time_left = wait_event_timeout(ar->peer_mapping_wq, ({
 164                         bool mapped;
 165
 166                         spin_lock_bh(&ar->data_lock);
 167                         mapped = !!ath10k_peer_find(ar, vdev_id, addr);
 168                         spin_unlock_bh(&ar->data_lock);
 169
 170                         (mapped == expect_mapped ||
 171                          test_bit(ATH10K_FLAG_CRASH_FLUSH, &ar->dev_flags));
 172                 }), 3 * HZ);
 173
 174         if (time_left == 0)
 175                 return -ETIMEDOUT;
 176
 177         return 0;
 178 }
 179
 180 int ath10k_wait_for_peer_created(struct ath10k *ar, int vdev_id, const u8 *addr)
 181 {
 182         return ath10k_wait_for_peer_common(ar, vdev_id, addr, true);
 183 }
 184
 185 int ath10k_wait_for_peer_deleted(struct ath10k *ar, int vdev_id, const u8 *addr)
 186 {
 187         return ath10k_wait_for_peer_common(ar, vdev_id, addr, false);
 188 }
 189
 190 void ath10k_peer_map_event(struct ath10k_htt *htt,
 191                            struct htt_peer_map_event *ev)
 192 {
 193         struct ath10k *ar = htt->ar;
 194         struct ath10k_peer *peer;
 195
 196         if (ev->peer_id >= ATH10K_MAX_NUM_PEER_IDS) {
 197                 ath10k_warn(ar,
 198                             "received htt peer map event with idx out of bounds: %hu\n",
 199                             ev->peer_id);
 200                 return;
 201         }
 202
 203         spin_lock_bh(&ar->data_lock);
 204         peer = ath10k_peer_find(ar, ev->vdev_id, ev->addr);
 205         if (!peer) {
 206                 peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
 207                 if (!peer)
 208                         goto exit;
 209
 210                 peer->vdev_id = ev->vdev_id;
 211                 ether_addr_copy(peer->addr, ev->addr);
 212                 list_add(&peer->list, &ar->peers);
 213                 wake_up(&ar->peer_mapping_wq);
 214         }
 215
 216         ath10k_dbg(ar, ATH10K_DBG_HTT, "htt peer map vdev %d peer %pM id %d\n",
 217                    ev->vdev_id, ev->addr, ev->peer_id);
 218
 219         WARN_ON(ar->peer_map[ev->peer_id] && (ar->peer_map[ev->peer_id] != peer));
 220         ar->peer_map[ev->peer_id] = peer;
 221         set_bit(ev->peer_id, peer->peer_ids);
 222 exit:
 223         spin_unlock_bh(&ar->data_lock);
 224 }
 225
 226 void ath10k_peer_unmap_event(struct ath10k_htt *htt,
 227                              struct htt_peer_unmap_event *ev)
 228 {
 229         struct ath10k *ar = htt->ar;
 230         struct ath10k_peer *peer;
 231
 232         if (ev->peer_id >= ATH10K_MAX_NUM_PEER_IDS) {
 233                 ath10k_warn(ar,
 234                             "received htt peer unmap event with idx out of bounds: %hu\n",
 235                             ev->peer_id);
 236                 return;
 237         }
 238
 239         spin_lock_bh(&ar->data_lock);
 240         peer = ath10k_peer_find_by_id(ar, ev->peer_id);
 241         if (!peer) {
 242                 ath10k_warn(ar, "peer-unmap-event: unknown peer id %d\n",
 243                             ev->peer_id);
 244                 goto exit;
 245         }
 246
 247         ath10k_dbg(ar, ATH10K_DBG_HTT, "htt peer unmap vdev %d peer %pM id %d\n",
 248                    peer->vdev_id, peer->addr, ev->peer_id);
 249
 250         ar->peer_map[ev->peer_id] = NULL;
 251         clear_bit(ev->peer_id, peer->peer_ids);
 252
 253         if (bitmap_empty(peer->peer_ids, ATH10K_MAX_NUM_PEER_IDS)) {
 254                 list_del(&peer->list);
 255                 kfree(peer);
 256                 wake_up(&ar->peer_mapping_wq);
 257         }
 258
 259 exit:
 260         spin_unlock_bh(&ar->data_lock);
 261 }