1/*
  2 * Copyright (c) 2005-2011 Atheros Communications Inc.
  3 * Copyright (c) 2011-2016 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
 24static 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	 */
 39	spin_lock_bh(&ar->data_lock);
 40	if (ar->offchan_tx_skb != skb) {
 41		ath10k_warn(ar, "completed old offchannel frame\n");
 42		goto out;
 43	}
 44
 45	complete(&ar->offchan_tx_completed);
 46	ar->offchan_tx_skb = NULL; /* just for sanity */
 47
 48	ath10k_dbg(ar, ATH10K_DBG_HTT, "completed offchannel skb %pK\n", skb);
 49out:
 50	spin_unlock_bh(&ar->data_lock);
 51}
 52
 53int ath10k_txrx_tx_unref(struct ath10k_htt *htt,
 54			 const struct htt_tx_done *tx_done)
 55{
 56	struct ath10k *ar = htt->ar;
 57	struct device *dev = ar->dev;
 58	struct ieee80211_tx_info *info;
 59	struct ieee80211_txq *txq;
 60	struct ath10k_skb_cb *skb_cb;
 61	struct ath10k_txq *artxq;
 62	struct sk_buff *msdu;
 63
 64	ath10k_dbg(ar, ATH10K_DBG_HTT,
 65		   "htt tx completion msdu_id %u status %d\n",
 66		   tx_done->msdu_id, tx_done->status);
 67
 68	if (tx_done->msdu_id >= htt->max_num_pending_tx) {
 69		ath10k_warn(ar, "warning: msdu_id %d too big, ignoring\n",
 70			    tx_done->msdu_id);
 71		return -EINVAL;
 72	}
 73
 74	spin_lock_bh(&htt->tx_lock);
 75	msdu = idr_find(&htt->pending_tx, tx_done->msdu_id);
 76	if (!msdu) {
 77		ath10k_warn(ar, "received tx completion for invalid msdu_id: %d\n",
 78			    tx_done->msdu_id);
 79		spin_unlock_bh(&htt->tx_lock);
 80		return -ENOENT;
 81	}
 82
 83	skb_cb = ATH10K_SKB_CB(msdu);
 84	txq = skb_cb->txq;
 85
 86	if (txq) {
 87		artxq = (void *)txq->drv_priv;
 88		artxq->num_fw_queued--;
 89	}
 90
 91	ath10k_htt_tx_free_msdu_id(htt, tx_done->msdu_id);
 92	ath10k_htt_tx_dec_pending(htt);
 93	if (htt->num_pending_tx == 0)
 94		wake_up(&htt->empty_tx_wq);
 95	spin_unlock_bh(&htt->tx_lock);
 96
 97	dma_unmap_single(dev, skb_cb->paddr, msdu->len, DMA_TO_DEVICE);
 98
 99	ath10k_report_offchan_tx(htt->ar, msdu);
100
101	info = IEEE80211_SKB_CB(msdu);
102	memset(&info->status, 0, sizeof(info->status));
103	trace_ath10k_txrx_tx_unref(ar, tx_done->msdu_id);
104
105	if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
106		info->flags |= IEEE80211_TX_STAT_ACK;
107
108	if (tx_done->status == HTT_TX_COMPL_STATE_NOACK)
109		info->flags &= ~IEEE80211_TX_STAT_ACK;
110
111	if ((tx_done->status == HTT_TX_COMPL_STATE_ACK) &&
112	    (info->flags & IEEE80211_TX_CTL_NO_ACK))
113		info->flags |= IEEE80211_TX_STAT_NOACK_TRANSMITTED;
114
115	if (tx_done->status == HTT_TX_COMPL_STATE_DISCARD) {
116		if (info->flags & IEEE80211_TX_CTL_NO_ACK)
117			info->flags &= ~IEEE80211_TX_STAT_NOACK_TRANSMITTED;
118		else
119			info->flags &= ~IEEE80211_TX_STAT_ACK;
120	}
121
122	ieee80211_tx_status(htt->ar->hw, msdu);
123	/* we do not own the msdu anymore */
124
125	return 0;
126}
127
128struct ath10k_peer *ath10k_peer_find(struct ath10k *ar, int vdev_id,
129				     const u8 *addr)
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 (peer->vdev_id != vdev_id)
137			continue;
138		if (!ether_addr_equal(peer->addr, addr))
139			continue;
140
141		return peer;
142	}
143
144	return NULL;
145}
146
147struct ath10k_peer *ath10k_peer_find_by_id(struct ath10k *ar, int peer_id)
148{
149	struct ath10k_peer *peer;
150
151	lockdep_assert_held(&ar->data_lock);
152
153	list_for_each_entry(peer, &ar->peers, list)
154		if (test_bit(peer_id, peer->peer_ids))
155			return peer;
156
157	return NULL;
158}
159
160static int ath10k_wait_for_peer_common(struct ath10k *ar, int vdev_id,
161				       const u8 *addr, bool expect_mapped)
162{
163	long time_left;
164
165	time_left = wait_event_timeout(ar->peer_mapping_wq, ({
166			bool mapped;
167
168			spin_lock_bh(&ar->data_lock);
169			mapped = !!ath10k_peer_find(ar, vdev_id, addr);
170			spin_unlock_bh(&ar->data_lock);
171
172			(mapped == expect_mapped ||
173			 test_bit(ATH10K_FLAG_CRASH_FLUSH, &ar->dev_flags));
174		}), 3 * HZ);
175
176	if (time_left == 0)
177		return -ETIMEDOUT;
178
179	return 0;
180}
181
182int ath10k_wait_for_peer_created(struct ath10k *ar, int vdev_id, const u8 *addr)
183{
184	return ath10k_wait_for_peer_common(ar, vdev_id, addr, true);
185}
186
187int ath10k_wait_for_peer_deleted(struct ath10k *ar, int vdev_id, const u8 *addr)
188{
189	return ath10k_wait_for_peer_common(ar, vdev_id, addr, false);
190}
191
192void ath10k_peer_map_event(struct ath10k_htt *htt,
193			   struct htt_peer_map_event *ev)
194{
195	struct ath10k *ar = htt->ar;
196	struct ath10k_peer *peer;
197
198	if (ev->peer_id >= ATH10K_MAX_NUM_PEER_IDS) {
199		ath10k_warn(ar,
200			    "received htt peer map event with idx out of bounds: %hu\n",
201			    ev->peer_id);
202		return;
203	}
204
205	spin_lock_bh(&ar->data_lock);
206	peer = ath10k_peer_find(ar, ev->vdev_id, ev->addr);
207	if (!peer) {
208		peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
209		if (!peer)
210			goto exit;
211
212		peer->vdev_id = ev->vdev_id;
213		ether_addr_copy(peer->addr, ev->addr);
214		list_add(&peer->list, &ar->peers);
215		wake_up(&ar->peer_mapping_wq);
216	}
217
218	ath10k_dbg(ar, ATH10K_DBG_HTT, "htt peer map vdev %d peer %pM id %d\n",
219		   ev->vdev_id, ev->addr, ev->peer_id);
220
221	WARN_ON(ar->peer_map[ev->peer_id] && (ar->peer_map[ev->peer_id] != peer));
222	ar->peer_map[ev->peer_id] = peer;
223	set_bit(ev->peer_id, peer->peer_ids);
224exit:
225	spin_unlock_bh(&ar->data_lock);
226}
227
228void ath10k_peer_unmap_event(struct ath10k_htt *htt,
229			     struct htt_peer_unmap_event *ev)
230{
231	struct ath10k *ar = htt->ar;
232	struct ath10k_peer *peer;
233
234	if (ev->peer_id >= ATH10K_MAX_NUM_PEER_IDS) {
235		ath10k_warn(ar,
236			    "received htt peer unmap event with idx out of bounds: %hu\n",
237			    ev->peer_id);
238		return;
239	}
240
241	spin_lock_bh(&ar->data_lock);
242	peer = ath10k_peer_find_by_id(ar, ev->peer_id);
243	if (!peer) {
244		ath10k_warn(ar, "peer-unmap-event: unknown peer id %d\n",
245			    ev->peer_id);
246		goto exit;
247	}
248
249	ath10k_dbg(ar, ATH10K_DBG_HTT, "htt peer unmap vdev %d peer %pM id %d\n",
250		   peer->vdev_id, peer->addr, ev->peer_id);
251
252	ar->peer_map[ev->peer_id] = NULL;
253	clear_bit(ev->peer_id, peer->peer_ids);
254
255	if (bitmap_empty(peer->peer_ids, ATH10K_MAX_NUM_PEER_IDS)) {
256		list_del(&peer->list);
257		kfree(peer);
258		wake_up(&ar->peer_mapping_wq);
259	}
260
261exit:
262	spin_unlock_bh(&ar->data_lock);
263}