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