text: /*
   * Copyright (c) 2005-2011 Atheros Communications Inc.
   * Copyright (c) 2011-2016 Qualcomm Atheros, Inc.
   * Copyright (c) 2018, The Linux Foundation. All rights reserved.
   *
   * Permission to use, copy, modify, and/or distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include "core.h"
  #include "txrx.h"
  #include "htt.h"
  #include "mac.h"
  #include "debug.h"
  
  static void ath10k_report_offchan_tx(struct ath10k *ar, struct sk_buff *skb)
  {
  	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  
  	if (likely(!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN)))
  		return;
  
  	if (ath10k_mac_tx_frm_has_freq(ar))
  		return;
  
  	/* If the original wait_for_completion() timed out before
  	 * {data,mgmt}_tx_completed() was called then we could complete
  	 * offchan_tx_completed for a different skb. Prevent this by using
  	 * offchan_tx_skb.
  	 */
  	spin_lock_bh(&ar->data_lock);
  	if (ar->offchan_tx_skb != skb) {
  		ath10k_warn(ar, "completed old offchannel frame\n");
  		goto out;
  	}
  
  	complete(&ar->offchan_tx_completed);
  	ar->offchan_tx_skb = NULL; /* just for sanity */
  
  	ath10k_dbg(ar, ATH10K_DBG_HTT, "completed offchannel skb %pK\n", skb);
  out:
  	spin_unlock_bh(&ar->data_lock);
  }
  
  int ath10k_txrx_tx_unref(struct ath10k_htt *htt,
  			 const struct htt_tx_done *tx_done)
  {
  	struct ath10k *ar = htt->ar;
  	struct device *dev = ar->dev;
  	struct ieee80211_tx_info *info;
  	struct ieee80211_txq *txq;
  	struct ath10k_skb_cb *skb_cb;
  	struct ath10k_txq *artxq;
  	struct sk_buff *msdu;
  
  	ath10k_dbg(ar, ATH10K_DBG_HTT,
  		   "htt tx completion msdu_id %u status %d\n",
  		   tx_done->msdu_id, tx_done->status);
  
  	if (tx_done->msdu_id >= htt->max_num_pending_tx) {
  		ath10k_warn(ar, "warning: msdu_id %d too big, ignoring\n",
  			    tx_done->msdu_id);
  		return -EINVAL;
  	}
  
  	spin_lock_bh(&htt->tx_lock);
  	msdu = idr_find(&htt->pending_tx, tx_done->msdu_id);
  	if (!msdu) {
  		ath10k_warn(ar, "received tx completion for invalid msdu_id: %d\n",
  			    tx_done->msdu_id);
  		spin_unlock_bh(&htt->tx_lock);
  		return -ENOENT;
  	}
  
  	skb_cb = ATH10K_SKB_CB(msdu);
  	txq = skb_cb->txq;
  
  	if (txq) {
  		artxq = (void *)txq->drv_priv;
  		artxq->num_fw_queued--;
  	}
  
  	ath10k_htt_tx_free_msdu_id(htt, tx_done->msdu_id);
  	ath10k_htt_tx_dec_pending(htt);
  	if (htt->num_pending_tx == 0)
  		wake_up(&htt->empty_tx_wq);
  	spin_unlock_bh(&htt->tx_lock);
  
  	dma_unmap_single(dev, skb_cb->paddr, msdu->len, DMA_TO_DEVICE);
  
  	ath10k_report_offchan_tx(htt->ar, msdu);
  
  	info = IEEE80211_SKB_CB(msdu);
  	memset(&info->status, 0, sizeof(info->status));
  	trace_ath10k_txrx_tx_unref(ar, tx_done->msdu_id);
  
  	if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
  		info->flags |= IEEE80211_TX_STAT_ACK;
  
  	if (tx_done->status == HTT_TX_COMPL_STATE_NOACK)
  		info->flags &= ~IEEE80211_TX_STAT_ACK;
  
  	if ((tx_done->status == HTT_TX_COMPL_STATE_ACK) &&
  	    (info->flags & IEEE80211_TX_CTL_NO_ACK))
  		info->flags |= IEEE80211_TX_STAT_NOACK_TRANSMITTED;
  
  	if (tx_done->status == HTT_TX_COMPL_STATE_DISCARD) {
  		if (info->flags & IEEE80211_TX_CTL_NO_ACK)
  			info->flags &= ~IEEE80211_TX_STAT_NOACK_TRANSMITTED;
  		else
  			info->flags &= ~IEEE80211_TX_STAT_ACK;
  	}
  
  	if (tx_done->status == HTT_TX_COMPL_STATE_ACK &&
  	    tx_done->ack_rssi != ATH10K_INVALID_RSSI) {
  		info->status.ack_signal = ATH10K_DEFAULT_NOISE_FLOOR +
  						tx_done->ack_rssi;
  		info->status.is_valid_ack_signal = true;
  	}
  
  	ieee80211_tx_status(htt->ar->hw, msdu);
  	/* we do not own the msdu anymore */
  
  	return 0;
  }
  
  struct ath10k_peer *ath10k_peer_find(struct ath10k *ar, int vdev_id,
  				     const u8 *addr)
  {
  	struct ath10k_peer *peer;
  
  	lockdep_assert_held(&ar->data_lock);
  
  	list_for_each_entry(peer, &ar->peers, list) {
  		if (peer->vdev_id != vdev_id)
  			continue;
  		if (!ether_addr_equal(peer->addr, addr))
  			continue;
  
  		return peer;
  	}
  
  	return NULL;
  }
  
  struct ath10k_peer *ath10k_peer_find_by_id(struct ath10k *ar, int peer_id)
  {
  	struct ath10k_peer *peer;
  
  	lockdep_assert_held(&ar->data_lock);
  
  	list_for_each_entry(peer, &ar->peers, list)
  		if (test_bit(peer_id, peer->peer_ids))
  			return peer;
  
  	return NULL;
  }
  
  static int ath10k_wait_for_peer_common(struct ath10k *ar, int vdev_id,
  				       const u8 *addr, bool expect_mapped)
  {
  	long time_left;
  
  	time_left = wait_event_timeout(ar->peer_mapping_wq, ({
  			bool mapped;
  
  			spin_lock_bh(&ar->data_lock);
  			mapped = !!ath10k_peer_find(ar, vdev_id, addr);
  			spin_unlock_bh(&ar->data_lock);
  
  			(mapped == expect_mapped ||
  			 test_bit(ATH10K_FLAG_CRASH_FLUSH, &ar->dev_flags));
  		}), 3 * HZ);
  
  	if (time_left == 0)
  		return -ETIMEDOUT;
  
  	return 0;
  }
  
  int ath10k_wait_for_peer_created(struct ath10k *ar, int vdev_id, const u8 *addr)
  {
  	return ath10k_wait_for_peer_common(ar, vdev_id, addr, true);
  }
  
  int ath10k_wait_for_peer_deleted(struct ath10k *ar, int vdev_id, const u8 *addr)
  {
  	return ath10k_wait_for_peer_common(ar, vdev_id, addr, false);
  }
  
  void ath10k_peer_map_event(struct ath10k_htt *htt,
  			   struct htt_peer_map_event *ev)
  {
  	struct ath10k *ar = htt->ar;
  	struct ath10k_peer *peer;
  
  	if (ev->peer_id >= ATH10K_MAX_NUM_PEER_IDS) {
  		ath10k_warn(ar,
  			    "received htt peer map event with idx out of bounds: %hu\n",
  			    ev->peer_id);
  		return;
  	}
  
  	spin_lock_bh(&ar->data_lock);
  	peer = ath10k_peer_find(ar, ev->vdev_id, ev->addr);
  	if (!peer) {
  		peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
  		if (!peer)
  			goto exit;
  
  		peer->vdev_id = ev->vdev_id;
  		ether_addr_copy(peer->addr, ev->addr);
  		list_add(&peer->list, &ar->peers);
  		wake_up(&ar->peer_mapping_wq);
  	}
  
  	ath10k_dbg(ar, ATH10K_DBG_HTT, "htt peer map vdev %d peer %pM id %d\n",
  		   ev->vdev_id, ev->addr, ev->peer_id);
  
  	WARN_ON(ar->peer_map[ev->peer_id] && (ar->peer_map[ev->peer_id] != peer));
  	ar->peer_map[ev->peer_id] = peer;
  	set_bit(ev->peer_id, peer->peer_ids);
  exit:
  	spin_unlock_bh(&ar->data_lock);
  }
  
  void ath10k_peer_unmap_event(struct ath10k_htt *htt,
  			     struct htt_peer_unmap_event *ev)
  {
  	struct ath10k *ar = htt->ar;
  	struct ath10k_peer *peer;
  
  	if (ev->peer_id >= ATH10K_MAX_NUM_PEER_IDS) {
  		ath10k_warn(ar,
  			    "received htt peer unmap event with idx out of bounds: %hu\n",
  			    ev->peer_id);
  		return;
  	}
  
  	spin_lock_bh(&ar->data_lock);
  	peer = ath10k_peer_find_by_id(ar, ev->peer_id);
  	if (!peer) {
  		ath10k_warn(ar, "peer-unmap-event: unknown peer id %d\n",
  			    ev->peer_id);
  		goto exit;
  	}
  
  	ath10k_dbg(ar, ATH10K_DBG_HTT, "htt peer unmap vdev %d peer %pM id %d\n",
  		   peer->vdev_id, peer->addr, ev->peer_id);
  
  	ar->peer_map[ev->peer_id] = NULL;
  	clear_bit(ev->peer_id, peer->peer_ids);
  
  	if (bitmap_empty(peer->peer_ids, ATH10K_MAX_NUM_PEER_IDS)) {
  		list_del(&peer->list);
  		kfree(peer);
  		wake_up(&ar->peer_mapping_wq);
  	}
  
  exit:
  	spin_unlock_bh(&ar->data_lock);
  }
  