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(ar, "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(ar, 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 ath10k *ar = htt->ar;
  51         struct device *dev = ar->dev;
  52         struct ieee80211_tx_info *info;
  53         struct ath10k_skb_cb *skb_cb;
  54         struct sk_buff *msdu;
  55         struct ieee80211_hdr *hdr;
  56         __le16 fc;
  57         bool limit_mgmt_desc = false;
  58
  59         ath10k_dbg(ar, ATH10K_DBG_HTT,
  60                    "htt tx completion msdu_id %u discard %d no_ack %d success %d\n",
  61                    tx_done->msdu_id, !!tx_done->discard,
  62                    !!tx_done->no_ack, !!tx_done->success);
  63
  64         if (tx_done->msdu_id >= htt->max_num_pending_tx) {
  65                 ath10k_warn(ar, "warning: msdu_id %d too big, ignoring\n",
  66                             tx_done->msdu_id);
  67                 return;
  68         }
  69
  70         spin_lock_bh(&htt->tx_lock);
  71         msdu = idr_find(&htt->pending_tx, tx_done->msdu_id);
  72         if (!msdu) {
  73                 ath10k_warn(ar, "received tx completion for invalid msdu_id: %d\n",
  74                             tx_done->msdu_id);
  75                 spin_unlock_bh(&htt->tx_lock);
  76                 return;
  77         }
  78
  79         hdr = (struct ieee80211_hdr *)msdu->data;
  80         fc = hdr->frame_control;
  81
  82         if (unlikely(ieee80211_is_mgmt(fc)) &&
  83             ar->hw_params.max_probe_resp_desc_thres)
  84                 limit_mgmt_desc = true;
  85
  86         ath10k_htt_tx_free_msdu_id(htt, tx_done->msdu_id);
  87         __ath10k_htt_tx_dec_pending(htt, limit_mgmt_desc);
  88         if (htt->num_pending_tx == 0)
  89                 wake_up(&htt->empty_tx_wq);
  90         spin_unlock_bh(&htt->tx_lock);
  91
  92         skb_cb = ATH10K_SKB_CB(msdu);
  93         dma_unmap_single(dev, skb_cb->paddr, msdu->len, DMA_TO_DEVICE);
  94
  95         ath10k_report_offchan_tx(htt->ar, msdu);
  96
  97         info = IEEE80211_SKB_CB(msdu);
  98         memset(&info->status, 0, sizeof(info->status));
  99         trace_ath10k_txrx_tx_unref(ar, tx_done->msdu_id);
 100
 101         if (tx_done->discard) {
 102                 ieee80211_free_txskb(htt->ar->hw, msdu);
 103                 return;
 104         }
 105
 106         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
 107                 info->flags |= IEEE80211_TX_STAT_ACK;
 108
 109         if (tx_done->no_ack)
 110                 info->flags &= ~IEEE80211_TX_STAT_ACK;
 111
 112         if (tx_done->success && (info->flags & IEEE80211_TX_CTL_NO_ACK))
 113                 info->flags |= IEEE80211_TX_STAT_NOACK_TRANSMITTED;
 114
 115         ieee80211_tx_status(htt->ar->hw, msdu);
 116         /* we do not own the msdu anymore */
 117 }
 118
 119 struct ath10k_peer *ath10k_peer_find(struct ath10k *ar, int vdev_id,
 120                                      const u8 *addr)
 121 {
 122         struct ath10k_peer *peer;
 123
 124         lockdep_assert_held(&ar->data_lock);
 125
 126         list_for_each_entry(peer, &ar->peers, list) {
 127                 if (peer->vdev_id != vdev_id)
 128                         continue;
 129                 if (memcmp(peer->addr, addr, ETH_ALEN))
 130                         continue;
 131
 132                 return peer;
 133         }
 134
 135         return NULL;
 136 }
 137
 138 struct ath10k_peer *ath10k_peer_find_by_id(struct ath10k *ar, int peer_id)
 139 {
 140         struct ath10k_peer *peer;
 141
 142         lockdep_assert_held(&ar->data_lock);
 143
 144         list_for_each_entry(peer, &ar->peers, list)
 145                 if (test_bit(peer_id, peer->peer_ids))
 146                         return peer;
 147
 148         return NULL;
 149 }
 150
 151 static int ath10k_wait_for_peer_common(struct ath10k *ar, int vdev_id,
 152                                        const u8 *addr, bool expect_mapped)
 153 {
 154         long time_left;
 155
 156         time_left = wait_event_timeout(ar->peer_mapping_wq, ({
 157                         bool mapped;
 158
 159                         spin_lock_bh(&ar->data_lock);
 160                         mapped = !!ath10k_peer_find(ar, vdev_id, addr);
 161                         spin_unlock_bh(&ar->data_lock);
 162
 163                         (mapped == expect_mapped ||
 164                          test_bit(ATH10K_FLAG_CRASH_FLUSH, &ar->dev_flags));
 165                 }), 3*HZ);
 166
 167         if (time_left == 0)
 168                 return -ETIMEDOUT;
 169
 170         return 0;
 171 }
 172
 173 int ath10k_wait_for_peer_created(struct ath10k *ar, int vdev_id, const u8 *addr)
 174 {
 175         return ath10k_wait_for_peer_common(ar, vdev_id, addr, true);
 176 }
 177
 178 int ath10k_wait_for_peer_deleted(struct ath10k *ar, int vdev_id, const u8 *addr)
 179 {
 180         return ath10k_wait_for_peer_common(ar, vdev_id, addr, false);
 181 }
 182
 183 void ath10k_peer_map_event(struct ath10k_htt *htt,
 184                            struct htt_peer_map_event *ev)
 185 {
 186         struct ath10k *ar = htt->ar;
 187         struct ath10k_peer *peer;
 188
 189         spin_lock_bh(&ar->data_lock);
 190         peer = ath10k_peer_find(ar, ev->vdev_id, ev->addr);
 191         if (!peer) {
 192                 peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
 193                 if (!peer)
 194                         goto exit;
 195
 196                 peer->vdev_id = ev->vdev_id;
 197                 ether_addr_copy(peer->addr, ev->addr);
 198                 list_add(&peer->list, &ar->peers);
 199                 wake_up(&ar->peer_mapping_wq);
 200         }
 201
 202         ath10k_dbg(ar, ATH10K_DBG_HTT, "htt peer map vdev %d peer %pM id %d\n",
 203                    ev->vdev_id, ev->addr, ev->peer_id);
 204
 205         set_bit(ev->peer_id, peer->peer_ids);
 206 exit:
 207         spin_unlock_bh(&ar->data_lock);
 208 }
 209
 210 void ath10k_peer_unmap_event(struct ath10k_htt *htt,
 211                              struct htt_peer_unmap_event *ev)
 212 {
 213         struct ath10k *ar = htt->ar;
 214         struct ath10k_peer *peer;
 215
 216         spin_lock_bh(&ar->data_lock);
 217         peer = ath10k_peer_find_by_id(ar, ev->peer_id);
 218         if (!peer) {
 219                 ath10k_warn(ar, "peer-unmap-event: unknown peer id %d\n",
 220                             ev->peer_id);
 221                 goto exit;
 222         }
 223
 224         ath10k_dbg(ar, ATH10K_DBG_HTT, "htt peer unmap vdev %d peer %pM id %d\n",
 225                    peer->vdev_id, peer->addr, ev->peer_id);
 226
 227         clear_bit(ev->peer_id, peer->peer_ids);
 228
 229         if (bitmap_empty(peer->peer_ids, ATH10K_MAX_NUM_PEER_IDS)) {
 230                 list_del(&peer->list);
 231                 kfree(peer);
 232                 wake_up(&ar->peer_mapping_wq);
 233         }
 234
 235 exit:
 236         spin_unlock_bh(&ar->data_lock);
 237 }