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 %pK\n", skb);
  48 out:
  49         spin_unlock_bh(&ar->data_lock);
  50 }
  51
  52 int 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 ieee80211_txq *txq;
  59         struct ath10k_skb_cb *skb_cb;
  60         struct ath10k_txq *artxq;
  61         struct sk_buff *msdu;
  62
  63         ath10k_dbg(ar, ATH10K_DBG_HTT,
  64                    "htt tx completion msdu_id %u status %d\n",
  65                    tx_done->msdu_id, tx_done->status);
  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 -EINVAL;
  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 -ENOENT;
  80         }
  81
  82         skb_cb = ATH10K_SKB_CB(msdu);
  83         txq = skb_cb->txq;
  84
  85         if (txq) {
  86                 artxq = (void *)txq->drv_priv;
  87                 artxq->num_fw_queued--;
  88         }
  89
  90         ath10k_htt_tx_free_msdu_id(htt, tx_done->msdu_id);
  91         ath10k_htt_tx_dec_pending(htt);
  92         if (htt->num_pending_tx == 0)
  93                 wake_up(&htt->empty_tx_wq);
  94         spin_unlock_bh(&htt->tx_lock);
  95
  96         dma_unmap_single(dev, skb_cb->paddr, msdu->len, DMA_TO_DEVICE);
  97
  98         ath10k_report_offchan_tx(htt->ar, msdu);
  99
 100         info = IEEE80211_SKB_CB(msdu);
 101         memset(&info->status, 0, sizeof(info->status));
 102         trace_ath10k_txrx_tx_unref(ar, tx_done->msdu_id);
 103
 104         if (tx_done->status == HTT_TX_COMPL_STATE_DISCARD) {
 105                 ieee80211_free_txskb(htt->ar->hw, msdu);
 106                 return 0;
 107         }
 108
 109         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
 110                 info->flags |= IEEE80211_TX_STAT_ACK;
 111
 112         if (tx_done->status == HTT_TX_COMPL_STATE_NOACK)
 113                 info->flags &= ~IEEE80211_TX_STAT_ACK;
 114
 115         if ((tx_done->status == HTT_TX_COMPL_STATE_ACK) &&
 116             (info->flags & IEEE80211_TX_CTL_NO_ACK))
 117                 info->flags |= IEEE80211_TX_STAT_NOACK_TRANSMITTED;
 118
 119         ieee80211_tx_status(htt->ar->hw, msdu);
 120         /* we do not own the msdu anymore */
 121
 122         return 0;
 123 }
 124
 125 struct ath10k_peer *ath10k_peer_find(struct ath10k *ar, int vdev_id,
 126                                      const u8 *addr)
 127 {
 128         struct ath10k_peer *peer;
 129
 130         lockdep_assert_held(&ar->data_lock);
 131
 132         list_for_each_entry(peer, &ar->peers, list) {
 133                 if (peer->vdev_id != vdev_id)
 134                         continue;
 135                 if (!ether_addr_equal(peer->addr, addr))
 136                         continue;
 137
 138                 return peer;
 139         }
 140
 141         return NULL;
 142 }
 143
 144 struct ath10k_peer *ath10k_peer_find_by_id(struct ath10k *ar, int peer_id)
 145 {
 146         struct ath10k_peer *peer;
 147
 148         lockdep_assert_held(&ar->data_lock);
 149
 150         list_for_each_entry(peer, &ar->peers, list)
 151                 if (test_bit(peer_id, peer->peer_ids))
 152                         return peer;
 153
 154         return NULL;
 155 }
 156
 157 static int ath10k_wait_for_peer_common(struct ath10k *ar, int vdev_id,
 158                                        const u8 *addr, bool expect_mapped)
 159 {
 160         long time_left;
 161
 162         time_left = wait_event_timeout(ar->peer_mapping_wq, ({
 163                         bool mapped;
 164
 165                         spin_lock_bh(&ar->data_lock);
 166                         mapped = !!ath10k_peer_find(ar, vdev_id, addr);
 167                         spin_unlock_bh(&ar->data_lock);
 168
 169                         (mapped == expect_mapped ||
 170                          test_bit(ATH10K_FLAG_CRASH_FLUSH, &ar->dev_flags));
 171                 }), 3 * HZ);
 172
 173         if (time_left == 0)
 174                 return -ETIMEDOUT;
 175
 176         return 0;
 177 }
 178
 179 int ath10k_wait_for_peer_created(struct ath10k *ar, int vdev_id, const u8 *addr)
 180 {
 181         return ath10k_wait_for_peer_common(ar, vdev_id, addr, true);
 182 }
 183
 184 int ath10k_wait_for_peer_deleted(struct ath10k *ar, int vdev_id, const u8 *addr)
 185 {
 186         return ath10k_wait_for_peer_common(ar, vdev_id, addr, false);
 187 }
 188
 189 void ath10k_peer_map_event(struct ath10k_htt *htt,
 190                            struct htt_peer_map_event *ev)
 191 {
 192         struct ath10k *ar = htt->ar;
 193         struct ath10k_peer *peer;
 194
 195         if (ev->peer_id >= ATH10K_MAX_NUM_PEER_IDS) {
 196                 ath10k_warn(ar,
 197                             "received htt peer map event with idx out of bounds: %hu\n",
 198                             ev->peer_id);
 199                 return;
 200         }
 201
 202         spin_lock_bh(&ar->data_lock);
 203         peer = ath10k_peer_find(ar, ev->vdev_id, ev->addr);
 204         if (!peer) {
 205                 peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
 206                 if (!peer)
 207                         goto exit;
 208
 209                 peer->vdev_id = ev->vdev_id;
 210                 ether_addr_copy(peer->addr, ev->addr);
 211                 list_add(&peer->list, &ar->peers);
 212                 wake_up(&ar->peer_mapping_wq);
 213         }
 214
 215         ath10k_dbg(ar, ATH10K_DBG_HTT, "htt peer map vdev %d peer %pM id %d\n",
 216                    ev->vdev_id, ev->addr, ev->peer_id);
 217
 218         WARN_ON(ar->peer_map[ev->peer_id] && (ar->peer_map[ev->peer_id] != peer));
 219         ar->peer_map[ev->peer_id] = peer;
 220         set_bit(ev->peer_id, peer->peer_ids);
 221 exit:
 222         spin_unlock_bh(&ar->data_lock);
 223 }
 224
 225 void ath10k_peer_unmap_event(struct ath10k_htt *htt,
 226                              struct htt_peer_unmap_event *ev)
 227 {
 228         struct ath10k *ar = htt->ar;
 229         struct ath10k_peer *peer;
 230
 231         if (ev->peer_id >= ATH10K_MAX_NUM_PEER_IDS) {
 232                 ath10k_warn(ar,
 233                             "received htt peer unmap event with idx out of bounds: %hu\n",
 234                             ev->peer_id);
 235                 return;
 236         }
 237
 238         spin_lock_bh(&ar->data_lock);
 239         peer = ath10k_peer_find_by_id(ar, ev->peer_id);
 240         if (!peer) {
 241                 ath10k_warn(ar, "peer-unmap-event: unknown peer id %d\n",
 242                             ev->peer_id);
 243                 goto exit;
 244         }
 245
 246         ath10k_dbg(ar, ATH10K_DBG_HTT, "htt peer unmap vdev %d peer %pM id %d\n",
 247                    peer->vdev_id, peer->addr, ev->peer_id);
 248
 249         ar->peer_map[ev->peer_id] = NULL;
 250         clear_bit(ev->peer_id, peer->peer_ids);
 251
 252         if (bitmap_empty(peer->peer_ids, ATH10K_MAX_NUM_PEER_IDS)) {
 253                 list_del(&peer->list);
 254                 kfree(peer);
 255                 wake_up(&ar->peer_mapping_wq);
 256         }
 257
 258 exit:
 259         spin_unlock_bh(&ar->data_lock);
 260 }