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         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         spin_lock_bh(&ar->data_lock);
  39         if (ar->offchan_tx_skb != skb) {
  40                 ath10k_warn(ar, "completed old offchannel frame\n");
  41                 goto out;
  42         }
  43
  44         complete(&ar->offchan_tx_completed);
  45         ar->offchan_tx_skb = NULL; /* just for sanity */
  46
  47         ath10k_dbg(ar, ATH10K_DBG_HTT, "completed offchannel skb %p\n", skb);
  48 out:
  49         spin_unlock_bh(&ar->data_lock);
  50 }
  51
  52 void ath10k_txrx_tx_unref(struct ath10k_htt *htt,
  53                           const struct htt_tx_done *tx_done)
  54 {
  55         struct ath10k *ar = htt->ar;
  56         struct device *dev = ar->dev;
  57         struct ieee80211_tx_info *info;
  58         struct ath10k_skb_cb *skb_cb;
  59         struct sk_buff *msdu;
  60         bool limit_mgmt_desc = false;
  61
  62         ath10k_dbg(ar, ATH10K_DBG_HTT,
  63                    "htt tx completion msdu_id %u discard %d no_ack %d success %d\n",
  64                    tx_done->msdu_id, !!tx_done->discard,
  65                    !!tx_done->no_ack, !!tx_done->success);
  66
  67         if (tx_done->msdu_id >= htt->max_num_pending_tx) {
  68                 ath10k_warn(ar, "warning: msdu_id %d too big, ignoring\n",
  69                             tx_done->msdu_id);
  70                 return;
  71         }
  72
  73         spin_lock_bh(&htt->tx_lock);
  74         msdu = idr_find(&htt->pending_tx, tx_done->msdu_id);
  75         if (!msdu) {
  76                 ath10k_warn(ar, "received tx completion for invalid msdu_id: %d\n",
  77                             tx_done->msdu_id);
  78                 spin_unlock_bh(&htt->tx_lock);
  79                 return;
  80         }
  81
  82         skb_cb = ATH10K_SKB_CB(msdu);
  83
  84         if (unlikely(skb_cb->flags & ATH10K_SKB_F_MGMT) &&
  85             ar->hw_params.max_probe_resp_desc_thres)
  86                 limit_mgmt_desc = true;
  87
  88         ath10k_htt_tx_free_msdu_id(htt, tx_done->msdu_id);
  89         __ath10k_htt_tx_dec_pending(htt, limit_mgmt_desc);
  90         if (htt->num_pending_tx == 0)
  91                 wake_up(&htt->empty_tx_wq);
  92         spin_unlock_bh(&htt->tx_lock);
  93
  94         dma_unmap_single(dev, skb_cb->paddr, msdu->len, DMA_TO_DEVICE);
  95
  96         ath10k_report_offchan_tx(htt->ar, msdu);
  97
  98         info = IEEE80211_SKB_CB(msdu);
  99         memset(&info->status, 0, sizeof(info->status));
 100         trace_ath10k_txrx_tx_unref(ar, tx_done->msdu_id);
 101
 102         if (tx_done->discard) {
 103                 ieee80211_free_txskb(htt->ar->hw, msdu);
 104                 return;
 105         }
 106
 107         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
 108                 info->flags |= IEEE80211_TX_STAT_ACK;
 109
 110         if (tx_done->no_ack)
 111                 info->flags &= ~IEEE80211_TX_STAT_ACK;
 112
 113         if (tx_done->success && (info->flags & IEEE80211_TX_CTL_NO_ACK))
 114                 info->flags |= IEEE80211_TX_STAT_NOACK_TRANSMITTED;
 115
 116         ieee80211_tx_status(htt->ar->hw, msdu);
 117         /* we do not own the msdu anymore */
 118 }
 119
 120 struct ath10k_peer *ath10k_peer_find(struct ath10k *ar, int vdev_id,
 121                                      const u8 *addr)
 122 {
 123         struct ath10k_peer *peer;
 124
 125         lockdep_assert_held(&ar->data_lock);
 126
 127         list_for_each_entry(peer, &ar->peers, list) {
 128                 if (peer->vdev_id != vdev_id)
 129                         continue;
 130                 if (memcmp(peer->addr, addr, ETH_ALEN))
 131                         continue;
 132
 133                 return peer;
 134         }
 135
 136         return NULL;
 137 }
 138
 139 struct ath10k_peer *ath10k_peer_find_by_id(struct ath10k *ar, int peer_id)
 140 {
 141         struct ath10k_peer *peer;
 142
 143         lockdep_assert_held(&ar->data_lock);
 144
 145         list_for_each_entry(peer, &ar->peers, list)
 146                 if (test_bit(peer_id, peer->peer_ids))
 147                         return peer;
 148
 149         return NULL;
 150 }
 151
 152 static int ath10k_wait_for_peer_common(struct ath10k *ar, int vdev_id,
 153                                        const u8 *addr, bool expect_mapped)
 154 {
 155         long time_left;
 156
 157         time_left = wait_event_timeout(ar->peer_mapping_wq, ({
 158                         bool mapped;
 159
 160                         spin_lock_bh(&ar->data_lock);
 161                         mapped = !!ath10k_peer_find(ar, vdev_id, addr);
 162                         spin_unlock_bh(&ar->data_lock);
 163
 164                         (mapped == expect_mapped ||
 165                          test_bit(ATH10K_FLAG_CRASH_FLUSH, &ar->dev_flags));
 166                 }), 3*HZ);
 167
 168         if (time_left == 0)
 169                 return -ETIMEDOUT;
 170
 171         return 0;
 172 }
 173
 174 int ath10k_wait_for_peer_created(struct ath10k *ar, int vdev_id, const u8 *addr)
 175 {
 176         return ath10k_wait_for_peer_common(ar, vdev_id, addr, true);
 177 }
 178
 179 int ath10k_wait_for_peer_deleted(struct ath10k *ar, int vdev_id, const u8 *addr)
 180 {
 181         return ath10k_wait_for_peer_common(ar, vdev_id, addr, false);
 182 }
 183
 184 void ath10k_peer_map_event(struct ath10k_htt *htt,
 185                            struct htt_peer_map_event *ev)
 186 {
 187         struct ath10k *ar = htt->ar;
 188         struct ath10k_peer *peer;
 189
 190         spin_lock_bh(&ar->data_lock);
 191         peer = ath10k_peer_find(ar, ev->vdev_id, ev->addr);
 192         if (!peer) {
 193                 peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
 194                 if (!peer)
 195                         goto exit;
 196
 197                 peer->vdev_id = ev->vdev_id;
 198                 ether_addr_copy(peer->addr, ev->addr);
 199                 list_add(&peer->list, &ar->peers);
 200                 wake_up(&ar->peer_mapping_wq);
 201         }
 202
 203         ath10k_dbg(ar, ATH10K_DBG_HTT, "htt peer map vdev %d peer %pM id %d\n",
 204                    ev->vdev_id, ev->addr, ev->peer_id);
 205
 206         set_bit(ev->peer_id, peer->peer_ids);
 207 exit:
 208         spin_unlock_bh(&ar->data_lock);
 209 }
 210
 211 void ath10k_peer_unmap_event(struct ath10k_htt *htt,
 212                              struct htt_peer_unmap_event *ev)
 213 {
 214         struct ath10k *ar = htt->ar;
 215         struct ath10k_peer *peer;
 216
 217         spin_lock_bh(&ar->data_lock);
 218         peer = ath10k_peer_find_by_id(ar, ev->peer_id);
 219         if (!peer) {
 220                 ath10k_warn(ar, "peer-unmap-event: unknown peer id %d\n",
 221                             ev->peer_id);
 222                 goto exit;
 223         }
 224
 225         ath10k_dbg(ar, ATH10K_DBG_HTT, "htt peer unmap vdev %d peer %pM id %d\n",
 226                    peer->vdev_id, peer->addr, ev->peer_id);
 227
 228         clear_bit(ev->peer_id, peer->peer_ids);
 229
 230         if (bitmap_empty(peer->peer_ids, ATH10K_MAX_NUM_PEER_IDS)) {
 231                 list_del(&peer->list);
 232                 kfree(peer);
 233                 wake_up(&ar->peer_mapping_wq);
 234         }
 235
 236 exit:
 237         spin_unlock_bh(&ar->data_lock);
 238 }