1 // SPDX-License-Identifier: ISC
2 /*
3  * Copyright (c) 2005-2011 Atheros Communications Inc.
4  * Copyright (c) 2011-2016 Qualcomm Atheros, Inc.
5  * Copyright (c) 2018, The Linux Foundation. All rights reserved.
6  */
7 
8 #include "core.h"
9 #include "txrx.h"
10 #include "htt.h"
11 #include "mac.h"
12 #include "debug.h"
13 
14 static void ath10k_report_offchan_tx(struct ath10k *ar, struct sk_buff *skb)
15 {
16 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
17 
18 	if (likely(!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN)))
19 		return;
20 
21 	if (ath10k_mac_tx_frm_has_freq(ar))
22 		return;
23 
24 	/* If the original wait_for_completion() timed out before
25 	 * {data,mgmt}_tx_completed() was called then we could complete
26 	 * offchan_tx_completed for a different skb. Prevent this by using
27 	 * offchan_tx_skb.
28 	 */
29 	spin_lock_bh(&ar->data_lock);
30 	if (ar->offchan_tx_skb != skb) {
31 		ath10k_warn(ar, "completed old offchannel frame\n");
32 		goto out;
33 	}
34 
35 	complete(&ar->offchan_tx_completed);
36 	ar->offchan_tx_skb = NULL; /* just for sanity */
37 
38 	ath10k_dbg(ar, ATH10K_DBG_HTT, "completed offchannel skb %pK\n", skb);
39 out:
40 	spin_unlock_bh(&ar->data_lock);
41 }
42 
43 int ath10k_txrx_tx_unref(struct ath10k_htt *htt,
44 			 const struct htt_tx_done *tx_done)
45 {
46 	struct ath10k *ar = htt->ar;
47 	struct device *dev = ar->dev;
48 	struct ieee80211_tx_info *info;
49 	struct ieee80211_txq *txq;
50 	struct ath10k_skb_cb *skb_cb;
51 	struct ath10k_txq *artxq;
52 	struct sk_buff *msdu;
53 	u8 flags;
54 
55 	ath10k_dbg(ar, ATH10K_DBG_HTT,
56 		   "htt tx completion msdu_id %u status %d\n",
57 		   tx_done->msdu_id, tx_done->status);
58 
59 	if (tx_done->msdu_id >= htt->max_num_pending_tx) {
60 		ath10k_warn(ar, "warning: msdu_id %d too big, ignoring\n",
61 			    tx_done->msdu_id);
62 		return -EINVAL;
63 	}
64 
65 	spin_lock_bh(&htt->tx_lock);
66 	msdu = idr_find(&htt->pending_tx, tx_done->msdu_id);
67 	if (!msdu) {
68 		ath10k_warn(ar, "received tx completion for invalid msdu_id: %d\n",
69 			    tx_done->msdu_id);
70 		spin_unlock_bh(&htt->tx_lock);
71 		return -ENOENT;
72 	}
73 
74 	skb_cb = ATH10K_SKB_CB(msdu);
75 	txq = skb_cb->txq;
76 
77 	if (txq) {
78 		artxq = (void *)txq->drv_priv;
79 		artxq->num_fw_queued--;
80 	}
81 
82 	flags = skb_cb->flags;
83 	ath10k_htt_tx_free_msdu_id(htt, tx_done->msdu_id);
84 	ath10k_htt_tx_dec_pending(htt);
85 	if (htt->num_pending_tx == 0)
86 		wake_up(&htt->empty_tx_wq);
87 	spin_unlock_bh(&htt->tx_lock);
88 
89 	rcu_read_lock();
90 	if (txq && txq->sta && skb_cb->airtime_est)
91 		ieee80211_sta_register_airtime(txq->sta, txq->tid,
92 					       skb_cb->airtime_est, 0);
93 	rcu_read_unlock();
94 
95 	if (ar->bus_param.dev_type != ATH10K_DEV_TYPE_HL)
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 	info->status.rates[0].idx = -1;
103 
104 	trace_ath10k_txrx_tx_unref(ar, tx_done->msdu_id);
105 
106 	if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) &&
107 	    !(flags & ATH10K_SKB_F_NOACK_TID))
108 		info->flags |= IEEE80211_TX_STAT_ACK;
109 
110 	if (tx_done->status == HTT_TX_COMPL_STATE_NOACK)
111 		info->flags &= ~IEEE80211_TX_STAT_ACK;
112 
113 	if ((tx_done->status == HTT_TX_COMPL_STATE_ACK) &&
114 	    ((info->flags & IEEE80211_TX_CTL_NO_ACK) ||
115 	    (flags & ATH10K_SKB_F_NOACK_TID)))
116 		info->flags |= IEEE80211_TX_STAT_NOACK_TRANSMITTED;
117 
118 	if (tx_done->status == HTT_TX_COMPL_STATE_DISCARD) {
119 		if ((info->flags & IEEE80211_TX_CTL_NO_ACK) ||
120 		    (flags & ATH10K_SKB_F_NOACK_TID))
121 			info->flags &= ~IEEE80211_TX_STAT_NOACK_TRANSMITTED;
122 		else
123 			info->flags &= ~IEEE80211_TX_STAT_ACK;
124 	}
125 
126 	if (tx_done->status == HTT_TX_COMPL_STATE_ACK &&
127 	    tx_done->ack_rssi != ATH10K_INVALID_RSSI) {
128 		info->status.ack_signal = ATH10K_DEFAULT_NOISE_FLOOR +
129 						tx_done->ack_rssi;
130 		info->status.is_valid_ack_signal = true;
131 	}
132 
133 	ieee80211_tx_status(htt->ar->hw, msdu);
134 	/* we do not own the msdu anymore */
135 
136 	return 0;
137 }
138 
139 struct ath10k_peer *ath10k_peer_find(struct ath10k *ar, int vdev_id,
140 				     const u8 *addr)
141 {
142 	struct ath10k_peer *peer;
143 
144 	lockdep_assert_held(&ar->data_lock);
145 
146 	list_for_each_entry(peer, &ar->peers, list) {
147 		if (peer->vdev_id != vdev_id)
148 			continue;
149 		if (!ether_addr_equal(peer->addr, addr))
150 			continue;
151 
152 		return peer;
153 	}
154 
155 	return NULL;
156 }
157 
158 struct ath10k_peer *ath10k_peer_find_by_id(struct ath10k *ar, int peer_id)
159 {
160 	struct ath10k_peer *peer;
161 
162 	if (peer_id >= BITS_PER_TYPE(peer->peer_ids))
163 		return NULL;
164 
165 	lockdep_assert_held(&ar->data_lock);
166 
167 	list_for_each_entry(peer, &ar->peers, list)
168 		if (test_bit(peer_id, peer->peer_ids))
169 			return peer;
170 
171 	return NULL;
172 }
173 
174 static int ath10k_wait_for_peer_common(struct ath10k *ar, int vdev_id,
175 				       const u8 *addr, bool expect_mapped)
176 {
177 	long time_left;
178 
179 	time_left = wait_event_timeout(ar->peer_mapping_wq, ({
180 			bool mapped;
181 
182 			spin_lock_bh(&ar->data_lock);
183 			mapped = !!ath10k_peer_find(ar, vdev_id, addr);
184 			spin_unlock_bh(&ar->data_lock);
185 
186 			(mapped == expect_mapped ||
187 			 test_bit(ATH10K_FLAG_CRASH_FLUSH, &ar->dev_flags));
188 		}), 3 * HZ);
189 
190 	if (time_left == 0)
191 		return -ETIMEDOUT;
192 
193 	return 0;
194 }
195 
196 int ath10k_wait_for_peer_created(struct ath10k *ar, int vdev_id, const u8 *addr)
197 {
198 	return ath10k_wait_for_peer_common(ar, vdev_id, addr, true);
199 }
200 
201 int ath10k_wait_for_peer_deleted(struct ath10k *ar, int vdev_id, const u8 *addr)
202 {
203 	return ath10k_wait_for_peer_common(ar, vdev_id, addr, false);
204 }
205 
206 void ath10k_peer_map_event(struct ath10k_htt *htt,
207 			   struct htt_peer_map_event *ev)
208 {
209 	struct ath10k *ar = htt->ar;
210 	struct ath10k_peer *peer;
211 
212 	if (ev->peer_id >= ATH10K_MAX_NUM_PEER_IDS) {
213 		ath10k_warn(ar,
214 			    "received htt peer map event with idx out of bounds: %u\n",
215 			    ev->peer_id);
216 		return;
217 	}
218 
219 	spin_lock_bh(&ar->data_lock);
220 	peer = ath10k_peer_find(ar, ev->vdev_id, ev->addr);
221 	if (!peer) {
222 		peer = kzalloc(sizeof(*peer), GFP_ATOMIC);
223 		if (!peer)
224 			goto exit;
225 
226 		peer->vdev_id = ev->vdev_id;
227 		ether_addr_copy(peer->addr, ev->addr);
228 		list_add(&peer->list, &ar->peers);
229 		wake_up(&ar->peer_mapping_wq);
230 	}
231 
232 	ath10k_dbg(ar, ATH10K_DBG_HTT, "htt peer map vdev %d peer %pM id %d\n",
233 		   ev->vdev_id, ev->addr, ev->peer_id);
234 
235 	WARN_ON(ar->peer_map[ev->peer_id] && (ar->peer_map[ev->peer_id] != peer));
236 	ar->peer_map[ev->peer_id] = peer;
237 	set_bit(ev->peer_id, peer->peer_ids);
238 exit:
239 	spin_unlock_bh(&ar->data_lock);
240 }
241 
242 void ath10k_peer_unmap_event(struct ath10k_htt *htt,
243 			     struct htt_peer_unmap_event *ev)
244 {
245 	struct ath10k *ar = htt->ar;
246 	struct ath10k_peer *peer;
247 
248 	if (ev->peer_id >= ATH10K_MAX_NUM_PEER_IDS) {
249 		ath10k_warn(ar,
250 			    "received htt peer unmap event with idx out of bounds: %u\n",
251 			    ev->peer_id);
252 		return;
253 	}
254 
255 	spin_lock_bh(&ar->data_lock);
256 	peer = ath10k_peer_find_by_id(ar, ev->peer_id);
257 	if (!peer) {
258 		ath10k_warn(ar, "peer-unmap-event: unknown peer id %d\n",
259 			    ev->peer_id);
260 		goto exit;
261 	}
262 
263 	ath10k_dbg(ar, ATH10K_DBG_HTT, "htt peer unmap vdev %d peer %pM id %d\n",
264 		   peer->vdev_id, peer->addr, ev->peer_id);
265 
266 	ar->peer_map[ev->peer_id] = NULL;
267 	clear_bit(ev->peer_id, peer->peer_ids);
268 
269 	if (bitmap_empty(peer->peer_ids, ATH10K_MAX_NUM_PEER_IDS)) {
270 		list_del(&peer->list);
271 		kfree(peer);
272 		wake_up(&ar->peer_mapping_wq);
273 	}
274 
275 exit:
276 	spin_unlock_bh(&ar->data_lock);
277 }
278