1 // SPDX-License-Identifier: GPL-2.0-only
2 /******************************************************************************
3  *
4  * Copyright(c) 2008 - 2014 Intel Corporation. All rights reserved.
5  * Copyright (C) 2019 Intel Corporation
6  *****************************************************************************/
7 
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/sched.h>
11 #include <linux/ieee80211.h>
12 #include "iwl-io.h"
13 #include "iwl-trans.h"
14 #include "iwl-agn-hw.h"
15 #include "dev.h"
16 #include "agn.h"
17 
18 static const u8 tid_to_ac[] = {
19 	IEEE80211_AC_BE,
20 	IEEE80211_AC_BK,
21 	IEEE80211_AC_BK,
22 	IEEE80211_AC_BE,
23 	IEEE80211_AC_VI,
24 	IEEE80211_AC_VI,
25 	IEEE80211_AC_VO,
26 	IEEE80211_AC_VO,
27 };
28 
iwlagn_tx_cmd_protection(struct iwl_priv * priv,struct ieee80211_tx_info * info,__le16 fc,__le32 * tx_flags)29 static void iwlagn_tx_cmd_protection(struct iwl_priv *priv,
30 				     struct ieee80211_tx_info *info,
31 				     __le16 fc, __le32 *tx_flags)
32 {
33 	if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS ||
34 	    info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT ||
35 	    info->flags & IEEE80211_TX_CTL_AMPDU)
36 		*tx_flags |= TX_CMD_FLG_PROT_REQUIRE_MSK;
37 }
38 
39 /*
40  * handle build REPLY_TX command notification.
41  */
iwlagn_tx_cmd_build_basic(struct iwl_priv * priv,struct sk_buff * skb,struct iwl_tx_cmd * tx_cmd,struct ieee80211_tx_info * info,struct ieee80211_hdr * hdr,u8 sta_id)42 static void iwlagn_tx_cmd_build_basic(struct iwl_priv *priv,
43 				      struct sk_buff *skb,
44 				      struct iwl_tx_cmd *tx_cmd,
45 				      struct ieee80211_tx_info *info,
46 				      struct ieee80211_hdr *hdr, u8 sta_id)
47 {
48 	__le16 fc = hdr->frame_control;
49 	__le32 tx_flags = tx_cmd->tx_flags;
50 
51 	tx_cmd->stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
52 
53 	if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
54 		tx_flags |= TX_CMD_FLG_ACK_MSK;
55 	else
56 		tx_flags &= ~TX_CMD_FLG_ACK_MSK;
57 
58 	if (ieee80211_is_probe_resp(fc))
59 		tx_flags |= TX_CMD_FLG_TSF_MSK;
60 	else if (ieee80211_is_back_req(fc))
61 		tx_flags |= TX_CMD_FLG_ACK_MSK | TX_CMD_FLG_IMM_BA_RSP_MASK;
62 	else if (info->band == NL80211_BAND_2GHZ &&
63 		 priv->lib->bt_params &&
64 		 priv->lib->bt_params->advanced_bt_coexist &&
65 		 (ieee80211_is_auth(fc) || ieee80211_is_assoc_req(fc) ||
66 		 ieee80211_is_reassoc_req(fc) ||
67 		 info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO))
68 		tx_flags |= TX_CMD_FLG_IGNORE_BT;
69 
70 
71 	tx_cmd->sta_id = sta_id;
72 	if (ieee80211_has_morefrags(fc))
73 		tx_flags |= TX_CMD_FLG_MORE_FRAG_MSK;
74 
75 	if (ieee80211_is_data_qos(fc)) {
76 		u8 *qc = ieee80211_get_qos_ctl(hdr);
77 		tx_cmd->tid_tspec = qc[0] & 0xf;
78 		tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
79 	} else {
80 		tx_cmd->tid_tspec = IWL_TID_NON_QOS;
81 		if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
82 			tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
83 		else
84 			tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
85 	}
86 
87 	iwlagn_tx_cmd_protection(priv, info, fc, &tx_flags);
88 
89 	tx_flags &= ~(TX_CMD_FLG_ANT_SEL_MSK);
90 	if (ieee80211_is_mgmt(fc)) {
91 		if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
92 			tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(3);
93 		else
94 			tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(2);
95 	} else {
96 		tx_cmd->timeout.pm_frame_timeout = 0;
97 	}
98 
99 	tx_cmd->driver_txop = 0;
100 	tx_cmd->tx_flags = tx_flags;
101 	tx_cmd->next_frame_len = 0;
102 }
103 
iwlagn_tx_cmd_build_rate(struct iwl_priv * priv,struct iwl_tx_cmd * tx_cmd,struct ieee80211_tx_info * info,struct ieee80211_sta * sta,__le16 fc)104 static void iwlagn_tx_cmd_build_rate(struct iwl_priv *priv,
105 				     struct iwl_tx_cmd *tx_cmd,
106 				     struct ieee80211_tx_info *info,
107 				     struct ieee80211_sta *sta,
108 				     __le16 fc)
109 {
110 	u32 rate_flags;
111 	int rate_idx;
112 	u8 rts_retry_limit;
113 	u8 data_retry_limit;
114 	u8 rate_plcp;
115 
116 	if (priv->wowlan) {
117 		rts_retry_limit = IWLAGN_LOW_RETRY_LIMIT;
118 		data_retry_limit = IWLAGN_LOW_RETRY_LIMIT;
119 	} else {
120 		/* Set retry limit on RTS packets */
121 		rts_retry_limit = IWLAGN_RTS_DFAULT_RETRY_LIMIT;
122 
123 		/* Set retry limit on DATA packets and Probe Responses*/
124 		if (ieee80211_is_probe_resp(fc)) {
125 			data_retry_limit = IWLAGN_MGMT_DFAULT_RETRY_LIMIT;
126 			rts_retry_limit =
127 				min(data_retry_limit, rts_retry_limit);
128 		} else if (ieee80211_is_back_req(fc))
129 			data_retry_limit = IWLAGN_BAR_DFAULT_RETRY_LIMIT;
130 		else
131 			data_retry_limit = IWLAGN_DEFAULT_TX_RETRY;
132 	}
133 
134 	tx_cmd->data_retry_limit = data_retry_limit;
135 	tx_cmd->rts_retry_limit = rts_retry_limit;
136 
137 	/* DATA packets will use the uCode station table for rate/antenna
138 	 * selection */
139 	if (ieee80211_is_data(fc)) {
140 		tx_cmd->initial_rate_index = 0;
141 		tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
142 		return;
143 	} else if (ieee80211_is_back_req(fc))
144 		tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
145 
146 	/**
147 	 * If the current TX rate stored in mac80211 has the MCS bit set, it's
148 	 * not really a TX rate.  Thus, we use the lowest supported rate for
149 	 * this band.  Also use the lowest supported rate if the stored rate
150 	 * index is invalid.
151 	 */
152 	rate_idx = info->control.rates[0].idx;
153 	if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS ||
154 			(rate_idx < 0) || (rate_idx > IWL_RATE_COUNT_LEGACY))
155 		rate_idx = rate_lowest_index(
156 				&priv->nvm_data->bands[info->band], sta);
157 	/* For 5 GHZ band, remap mac80211 rate indices into driver indices */
158 	if (info->band == NL80211_BAND_5GHZ)
159 		rate_idx += IWL_FIRST_OFDM_RATE;
160 	/* Get PLCP rate for tx_cmd->rate_n_flags */
161 	rate_plcp = iwl_rates[rate_idx].plcp;
162 	/* Zero out flags for this packet */
163 	rate_flags = 0;
164 
165 	/* Set CCK flag as needed */
166 	if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
167 		rate_flags |= RATE_MCS_CCK_MSK;
168 
169 	/* Set up antennas */
170 	if (priv->lib->bt_params &&
171 	    priv->lib->bt_params->advanced_bt_coexist &&
172 	    priv->bt_full_concurrent) {
173 		/* operated as 1x1 in full concurrency mode */
174 		priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
175 				first_antenna(priv->nvm_data->valid_tx_ant));
176 	} else
177 		priv->mgmt_tx_ant = iwl_toggle_tx_ant(
178 					priv, priv->mgmt_tx_ant,
179 					priv->nvm_data->valid_tx_ant);
180 	rate_flags |= iwl_ant_idx_to_flags(priv->mgmt_tx_ant);
181 
182 	/* Set the rate in the TX cmd */
183 	tx_cmd->rate_n_flags = iwl_hw_set_rate_n_flags(rate_plcp, rate_flags);
184 }
185 
iwlagn_tx_cmd_build_hwcrypto(struct iwl_priv * priv,struct ieee80211_tx_info * info,struct iwl_tx_cmd * tx_cmd,struct sk_buff * skb_frag)186 static void iwlagn_tx_cmd_build_hwcrypto(struct iwl_priv *priv,
187 					 struct ieee80211_tx_info *info,
188 					 struct iwl_tx_cmd *tx_cmd,
189 					 struct sk_buff *skb_frag)
190 {
191 	struct ieee80211_key_conf *keyconf = info->control.hw_key;
192 
193 	switch (keyconf->cipher) {
194 	case WLAN_CIPHER_SUITE_CCMP:
195 		tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
196 		memcpy(tx_cmd->key, keyconf->key, keyconf->keylen);
197 		if (info->flags & IEEE80211_TX_CTL_AMPDU)
198 			tx_cmd->tx_flags |= TX_CMD_FLG_AGG_CCMP_MSK;
199 		break;
200 
201 	case WLAN_CIPHER_SUITE_TKIP:
202 		tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
203 		ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
204 		break;
205 
206 	case WLAN_CIPHER_SUITE_WEP104:
207 		tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
208 		fallthrough;
209 	case WLAN_CIPHER_SUITE_WEP40:
210 		tx_cmd->sec_ctl |= (TX_CMD_SEC_WEP |
211 			(keyconf->keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT);
212 
213 		memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
214 
215 		IWL_DEBUG_TX(priv, "Configuring packet for WEP encryption "
216 			     "with key %d\n", keyconf->keyidx);
217 		break;
218 
219 	default:
220 		IWL_ERR(priv, "Unknown encode cipher %x\n", keyconf->cipher);
221 		break;
222 	}
223 }
224 
225 /**
226  * iwl_sta_id_or_broadcast - return sta_id or broadcast sta
227  * @context: the current context
228  * @sta: mac80211 station
229  *
230  * In certain circumstances mac80211 passes a station pointer
231  * that may be %NULL, for example during TX or key setup. In
232  * that case, we need to use the broadcast station, so this
233  * inline wraps that pattern.
234  */
iwl_sta_id_or_broadcast(struct iwl_rxon_context * context,struct ieee80211_sta * sta)235 static int iwl_sta_id_or_broadcast(struct iwl_rxon_context *context,
236 				   struct ieee80211_sta *sta)
237 {
238 	int sta_id;
239 
240 	if (!sta)
241 		return context->bcast_sta_id;
242 
243 	sta_id = iwl_sta_id(sta);
244 
245 	/*
246 	 * mac80211 should not be passing a partially
247 	 * initialised station!
248 	 */
249 	WARN_ON(sta_id == IWL_INVALID_STATION);
250 
251 	return sta_id;
252 }
253 
254 /*
255  * start REPLY_TX command process
256  */
iwlagn_tx_skb(struct iwl_priv * priv,struct ieee80211_sta * sta,struct sk_buff * skb)257 int iwlagn_tx_skb(struct iwl_priv *priv,
258 		  struct ieee80211_sta *sta,
259 		  struct sk_buff *skb)
260 {
261 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
262 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
263 	struct iwl_station_priv *sta_priv = NULL;
264 	struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
265 	struct iwl_device_tx_cmd *dev_cmd;
266 	struct iwl_tx_cmd *tx_cmd;
267 	__le16 fc;
268 	u8 hdr_len;
269 	u16 len, seq_number = 0;
270 	u8 sta_id, tid = IWL_MAX_TID_COUNT;
271 	bool is_agg = false, is_data_qos = false;
272 	int txq_id;
273 
274 	if (info->control.vif)
275 		ctx = iwl_rxon_ctx_from_vif(info->control.vif);
276 
277 	if (iwl_is_rfkill(priv)) {
278 		IWL_DEBUG_DROP(priv, "Dropping - RF KILL\n");
279 		goto drop_unlock_priv;
280 	}
281 
282 	fc = hdr->frame_control;
283 
284 #ifdef CONFIG_IWLWIFI_DEBUG
285 	if (ieee80211_is_auth(fc))
286 		IWL_DEBUG_TX(priv, "Sending AUTH frame\n");
287 	else if (ieee80211_is_assoc_req(fc))
288 		IWL_DEBUG_TX(priv, "Sending ASSOC frame\n");
289 	else if (ieee80211_is_reassoc_req(fc))
290 		IWL_DEBUG_TX(priv, "Sending REASSOC frame\n");
291 #endif
292 
293 	if (unlikely(ieee80211_is_probe_resp(fc))) {
294 		struct iwl_wipan_noa_data *noa_data =
295 			rcu_dereference(priv->noa_data);
296 
297 		if (noa_data &&
298 		    pskb_expand_head(skb, 0, noa_data->length,
299 				     GFP_ATOMIC) == 0) {
300 			skb_put_data(skb, noa_data->data, noa_data->length);
301 			hdr = (struct ieee80211_hdr *)skb->data;
302 		}
303 	}
304 
305 	hdr_len = ieee80211_hdrlen(fc);
306 
307 	/* For management frames use broadcast id to do not break aggregation */
308 	if (!ieee80211_is_data(fc))
309 		sta_id = ctx->bcast_sta_id;
310 	else {
311 		/* Find index into station table for destination station */
312 		sta_id = iwl_sta_id_or_broadcast(ctx, sta);
313 		if (sta_id == IWL_INVALID_STATION) {
314 			IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n",
315 				       hdr->addr1);
316 			goto drop_unlock_priv;
317 		}
318 	}
319 
320 	if (sta)
321 		sta_priv = (void *)sta->drv_priv;
322 
323 	if (sta_priv && sta_priv->asleep &&
324 	    (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER)) {
325 		/*
326 		 * This sends an asynchronous command to the device,
327 		 * but we can rely on it being processed before the
328 		 * next frame is processed -- and the next frame to
329 		 * this station is the one that will consume this
330 		 * counter.
331 		 * For now set the counter to just 1 since we do not
332 		 * support uAPSD yet.
333 		 *
334 		 * FIXME: If we get two non-bufferable frames one
335 		 * after the other, we might only send out one of
336 		 * them because this is racy.
337 		 */
338 		iwl_sta_modify_sleep_tx_count(priv, sta_id, 1);
339 	}
340 
341 	dev_cmd = iwl_trans_alloc_tx_cmd(priv->trans);
342 
343 	if (unlikely(!dev_cmd))
344 		goto drop_unlock_priv;
345 
346 	dev_cmd->hdr.cmd = REPLY_TX;
347 	tx_cmd = (struct iwl_tx_cmd *) dev_cmd->payload;
348 
349 	/* Total # bytes to be transmitted */
350 	len = (u16)skb->len;
351 	tx_cmd->len = cpu_to_le16(len);
352 
353 	if (info->control.hw_key)
354 		iwlagn_tx_cmd_build_hwcrypto(priv, info, tx_cmd, skb);
355 
356 	/* TODO need this for burst mode later on */
357 	iwlagn_tx_cmd_build_basic(priv, skb, tx_cmd, info, hdr, sta_id);
358 
359 	iwlagn_tx_cmd_build_rate(priv, tx_cmd, info, sta, fc);
360 
361 	memset(&info->status, 0, sizeof(info->status));
362 	memset(info->driver_data, 0, sizeof(info->driver_data));
363 
364 	info->driver_data[0] = ctx;
365 	info->driver_data[1] = dev_cmd;
366 	/* From now on, we cannot access info->control */
367 
368 	spin_lock(&priv->sta_lock);
369 
370 	if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc)) {
371 		u8 *qc = NULL;
372 		struct iwl_tid_data *tid_data;
373 		qc = ieee80211_get_qos_ctl(hdr);
374 		tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
375 		if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
376 			goto drop_unlock_sta;
377 		tid_data = &priv->tid_data[sta_id][tid];
378 
379 		/* aggregation is on for this <sta,tid> */
380 		if (info->flags & IEEE80211_TX_CTL_AMPDU &&
381 		    tid_data->agg.state != IWL_AGG_ON) {
382 			IWL_ERR(priv,
383 				"TX_CTL_AMPDU while not in AGG: Tx flags = 0x%08x, agg.state = %d\n",
384 				info->flags, tid_data->agg.state);
385 			IWL_ERR(priv, "sta_id = %d, tid = %d seq_num = %d\n",
386 				sta_id, tid,
387 				IEEE80211_SEQ_TO_SN(tid_data->seq_number));
388 			goto drop_unlock_sta;
389 		}
390 
391 		/* We can receive packets from the stack in IWL_AGG_{ON,OFF}
392 		 * only. Check this here.
393 		 */
394 		if (WARN_ONCE(tid_data->agg.state != IWL_AGG_ON &&
395 			      tid_data->agg.state != IWL_AGG_OFF,
396 			      "Tx while agg.state = %d\n", tid_data->agg.state))
397 			goto drop_unlock_sta;
398 
399 		seq_number = tid_data->seq_number;
400 		seq_number &= IEEE80211_SCTL_SEQ;
401 		hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
402 		hdr->seq_ctrl |= cpu_to_le16(seq_number);
403 		seq_number += 0x10;
404 
405 		if (info->flags & IEEE80211_TX_CTL_AMPDU)
406 			is_agg = true;
407 		is_data_qos = true;
408 	}
409 
410 	/* Copy MAC header from skb into command buffer */
411 	memcpy(tx_cmd->hdr, hdr, hdr_len);
412 
413 	txq_id = info->hw_queue;
414 
415 	if (is_agg)
416 		txq_id = priv->tid_data[sta_id][tid].agg.txq_id;
417 	else if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
418 		/*
419 		 * The microcode will clear the more data
420 		 * bit in the last frame it transmits.
421 		 */
422 		hdr->frame_control |=
423 			cpu_to_le16(IEEE80211_FCTL_MOREDATA);
424 	}
425 
426 	WARN_ON_ONCE(is_agg &&
427 		     priv->queue_to_mac80211[txq_id] != info->hw_queue);
428 
429 	IWL_DEBUG_TX(priv, "TX to [%d|%d] Q:%d - seq: 0x%x\n", sta_id, tid,
430 		     txq_id, seq_number);
431 
432 	if (iwl_trans_tx(priv->trans, skb, dev_cmd, txq_id))
433 		goto drop_unlock_sta;
434 
435 	if (is_data_qos && !ieee80211_has_morefrags(fc))
436 		priv->tid_data[sta_id][tid].seq_number = seq_number;
437 
438 	spin_unlock(&priv->sta_lock);
439 
440 	/*
441 	 * Avoid atomic ops if it isn't an associated client.
442 	 * Also, if this is a packet for aggregation, don't
443 	 * increase the counter because the ucode will stop
444 	 * aggregation queues when their respective station
445 	 * goes to sleep.
446 	 */
447 	if (sta_priv && sta_priv->client && !is_agg)
448 		atomic_inc(&sta_priv->pending_frames);
449 
450 	return 0;
451 
452 drop_unlock_sta:
453 	if (dev_cmd)
454 		iwl_trans_free_tx_cmd(priv->trans, dev_cmd);
455 	spin_unlock(&priv->sta_lock);
456 drop_unlock_priv:
457 	return -1;
458 }
459 
iwlagn_alloc_agg_txq(struct iwl_priv * priv,int mq)460 static int iwlagn_alloc_agg_txq(struct iwl_priv *priv, int mq)
461 {
462 	int q;
463 
464 	for (q = IWLAGN_FIRST_AMPDU_QUEUE;
465 	     q < priv->trans->trans_cfg->base_params->num_of_queues; q++) {
466 		if (!test_and_set_bit(q, priv->agg_q_alloc)) {
467 			priv->queue_to_mac80211[q] = mq;
468 			return q;
469 		}
470 	}
471 
472 	return -ENOSPC;
473 }
474 
iwlagn_dealloc_agg_txq(struct iwl_priv * priv,int q)475 static void iwlagn_dealloc_agg_txq(struct iwl_priv *priv, int q)
476 {
477 	clear_bit(q, priv->agg_q_alloc);
478 	priv->queue_to_mac80211[q] = IWL_INVALID_MAC80211_QUEUE;
479 }
480 
iwlagn_tx_agg_stop(struct iwl_priv * priv,struct ieee80211_vif * vif,struct ieee80211_sta * sta,u16 tid)481 int iwlagn_tx_agg_stop(struct iwl_priv *priv, struct ieee80211_vif *vif,
482 			struct ieee80211_sta *sta, u16 tid)
483 {
484 	struct iwl_tid_data *tid_data;
485 	int sta_id, txq_id;
486 	enum iwl_agg_state agg_state;
487 
488 	sta_id = iwl_sta_id(sta);
489 
490 	if (sta_id == IWL_INVALID_STATION) {
491 		IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
492 		return -ENXIO;
493 	}
494 
495 	spin_lock_bh(&priv->sta_lock);
496 
497 	tid_data = &priv->tid_data[sta_id][tid];
498 	txq_id = tid_data->agg.txq_id;
499 
500 	switch (tid_data->agg.state) {
501 	case IWL_EMPTYING_HW_QUEUE_ADDBA:
502 		/*
503 		* This can happen if the peer stops aggregation
504 		* again before we've had a chance to drain the
505 		* queue we selected previously, i.e. before the
506 		* session was really started completely.
507 		*/
508 		IWL_DEBUG_HT(priv, "AGG stop before setup done\n");
509 		goto turn_off;
510 	case IWL_AGG_STARTING:
511 		/*
512 		 * This can happen when the session is stopped before
513 		 * we receive ADDBA response
514 		 */
515 		IWL_DEBUG_HT(priv, "AGG stop before AGG became operational\n");
516 		goto turn_off;
517 	case IWL_AGG_ON:
518 		break;
519 	default:
520 		IWL_WARN(priv,
521 			 "Stopping AGG while state not ON or starting for %d on %d (%d)\n",
522 			 sta_id, tid, tid_data->agg.state);
523 		spin_unlock_bh(&priv->sta_lock);
524 		return 0;
525 	}
526 
527 	tid_data->agg.ssn = IEEE80211_SEQ_TO_SN(tid_data->seq_number);
528 
529 	/* There are still packets for this RA / TID in the HW */
530 	if (!test_bit(txq_id, priv->agg_q_alloc)) {
531 		IWL_DEBUG_TX_QUEUES(priv,
532 			"stopping AGG on STA/TID %d/%d but hwq %d not used\n",
533 			sta_id, tid, txq_id);
534 	} else if (tid_data->agg.ssn != tid_data->next_reclaimed) {
535 		IWL_DEBUG_TX_QUEUES(priv,
536 				    "Can't proceed: ssn %d, next_recl = %d\n",
537 				    tid_data->agg.ssn,
538 				    tid_data->next_reclaimed);
539 		tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_DELBA;
540 		spin_unlock_bh(&priv->sta_lock);
541 		return 0;
542 	}
543 
544 	IWL_DEBUG_TX_QUEUES(priv, "Can proceed: ssn = next_recl = %d\n",
545 			    tid_data->agg.ssn);
546 turn_off:
547 	agg_state = tid_data->agg.state;
548 	tid_data->agg.state = IWL_AGG_OFF;
549 
550 	spin_unlock_bh(&priv->sta_lock);
551 
552 	if (test_bit(txq_id, priv->agg_q_alloc)) {
553 		/*
554 		 * If the transport didn't know that we wanted to start
555 		 * agreggation, don't tell it that we want to stop them.
556 		 * This can happen when we don't get the addBA response on
557 		 * time, or we hadn't time to drain the AC queues.
558 		 */
559 		if (agg_state == IWL_AGG_ON)
560 			iwl_trans_txq_disable(priv->trans, txq_id, true);
561 		else
562 			IWL_DEBUG_TX_QUEUES(priv, "Don't disable tx agg: %d\n",
563 					    agg_state);
564 		iwlagn_dealloc_agg_txq(priv, txq_id);
565 	}
566 
567 	ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
568 
569 	return 0;
570 }
571 
iwlagn_tx_agg_start(struct iwl_priv * priv,struct ieee80211_vif * vif,struct ieee80211_sta * sta,u16 tid,u16 * ssn)572 int iwlagn_tx_agg_start(struct iwl_priv *priv, struct ieee80211_vif *vif,
573 			struct ieee80211_sta *sta, u16 tid, u16 *ssn)
574 {
575 	struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
576 	struct iwl_tid_data *tid_data;
577 	int sta_id, txq_id, ret;
578 
579 	IWL_DEBUG_HT(priv, "TX AGG request on ra = %pM tid = %d\n",
580 		     sta->addr, tid);
581 
582 	sta_id = iwl_sta_id(sta);
583 	if (sta_id == IWL_INVALID_STATION) {
584 		IWL_ERR(priv, "Start AGG on invalid station\n");
585 		return -ENXIO;
586 	}
587 	if (unlikely(tid >= IWL_MAX_TID_COUNT))
588 		return -EINVAL;
589 
590 	if (priv->tid_data[sta_id][tid].agg.state != IWL_AGG_OFF) {
591 		IWL_ERR(priv, "Start AGG when state is not IWL_AGG_OFF !\n");
592 		return -ENXIO;
593 	}
594 
595 	txq_id = iwlagn_alloc_agg_txq(priv, ctx->ac_to_queue[tid_to_ac[tid]]);
596 	if (txq_id < 0) {
597 		IWL_DEBUG_TX_QUEUES(priv,
598 			"No free aggregation queue for %pM/%d\n",
599 			sta->addr, tid);
600 		return txq_id;
601 	}
602 
603 	ret = iwl_sta_tx_modify_enable_tid(priv, sta_id, tid);
604 	if (ret)
605 		return ret;
606 
607 	spin_lock_bh(&priv->sta_lock);
608 	tid_data = &priv->tid_data[sta_id][tid];
609 	tid_data->agg.ssn = IEEE80211_SEQ_TO_SN(tid_data->seq_number);
610 	tid_data->agg.txq_id = txq_id;
611 
612 	*ssn = tid_data->agg.ssn;
613 
614 	if (*ssn == tid_data->next_reclaimed) {
615 		IWL_DEBUG_TX_QUEUES(priv, "Can proceed: ssn = next_recl = %d\n",
616 				    tid_data->agg.ssn);
617 		tid_data->agg.state = IWL_AGG_STARTING;
618 		ret = IEEE80211_AMPDU_TX_START_IMMEDIATE;
619 	} else {
620 		IWL_DEBUG_TX_QUEUES(priv, "Can't proceed: ssn %d, "
621 				    "next_reclaimed = %d\n",
622 				    tid_data->agg.ssn,
623 				    tid_data->next_reclaimed);
624 		tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_ADDBA;
625 	}
626 	spin_unlock_bh(&priv->sta_lock);
627 
628 	return ret;
629 }
630 
iwlagn_tx_agg_flush(struct iwl_priv * priv,struct ieee80211_vif * vif,struct ieee80211_sta * sta,u16 tid)631 int iwlagn_tx_agg_flush(struct iwl_priv *priv, struct ieee80211_vif *vif,
632 			struct ieee80211_sta *sta, u16 tid)
633 {
634 	struct iwl_tid_data *tid_data;
635 	enum iwl_agg_state agg_state;
636 	int sta_id, txq_id;
637 	sta_id = iwl_sta_id(sta);
638 
639 	/*
640 	 * First set the agg state to OFF to avoid calling
641 	 * ieee80211_stop_tx_ba_cb in iwlagn_check_ratid_empty.
642 	 */
643 	spin_lock_bh(&priv->sta_lock);
644 
645 	tid_data = &priv->tid_data[sta_id][tid];
646 	txq_id = tid_data->agg.txq_id;
647 	agg_state = tid_data->agg.state;
648 	IWL_DEBUG_TX_QUEUES(priv, "Flush AGG: sta %d tid %d q %d state %d\n",
649 			    sta_id, tid, txq_id, tid_data->agg.state);
650 
651 	tid_data->agg.state = IWL_AGG_OFF;
652 
653 	spin_unlock_bh(&priv->sta_lock);
654 
655 	if (iwlagn_txfifo_flush(priv, BIT(txq_id)))
656 		IWL_ERR(priv, "Couldn't flush the AGG queue\n");
657 
658 	if (test_bit(txq_id, priv->agg_q_alloc)) {
659 		/*
660 		 * If the transport didn't know that we wanted to start
661 		 * agreggation, don't tell it that we want to stop them.
662 		 * This can happen when we don't get the addBA response on
663 		 * time, or we hadn't time to drain the AC queues.
664 		 */
665 		if (agg_state == IWL_AGG_ON)
666 			iwl_trans_txq_disable(priv->trans, txq_id, true);
667 		else
668 			IWL_DEBUG_TX_QUEUES(priv, "Don't disable tx agg: %d\n",
669 					    agg_state);
670 		iwlagn_dealloc_agg_txq(priv, txq_id);
671 	}
672 
673 	return 0;
674 }
675 
iwlagn_tx_agg_oper(struct iwl_priv * priv,struct ieee80211_vif * vif,struct ieee80211_sta * sta,u16 tid,u8 buf_size)676 int iwlagn_tx_agg_oper(struct iwl_priv *priv, struct ieee80211_vif *vif,
677 			struct ieee80211_sta *sta, u16 tid, u8 buf_size)
678 {
679 	struct iwl_station_priv *sta_priv = (void *) sta->drv_priv;
680 	struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
681 	int q, fifo;
682 	u16 ssn;
683 
684 	buf_size = min_t(int, buf_size, LINK_QUAL_AGG_FRAME_LIMIT_DEF);
685 
686 	spin_lock_bh(&priv->sta_lock);
687 	ssn = priv->tid_data[sta_priv->sta_id][tid].agg.ssn;
688 	q = priv->tid_data[sta_priv->sta_id][tid].agg.txq_id;
689 	priv->tid_data[sta_priv->sta_id][tid].agg.state = IWL_AGG_ON;
690 	spin_unlock_bh(&priv->sta_lock);
691 
692 	fifo = ctx->ac_to_fifo[tid_to_ac[tid]];
693 
694 	iwl_trans_txq_enable(priv->trans, q, fifo, sta_priv->sta_id, tid,
695 			     buf_size, ssn, 0);
696 
697 	/*
698 	 * If the limit is 0, then it wasn't initialised yet,
699 	 * use the default. We can do that since we take the
700 	 * minimum below, and we don't want to go above our
701 	 * default due to hardware restrictions.
702 	 */
703 	if (sta_priv->max_agg_bufsize == 0)
704 		sta_priv->max_agg_bufsize =
705 			LINK_QUAL_AGG_FRAME_LIMIT_DEF;
706 
707 	/*
708 	 * Even though in theory the peer could have different
709 	 * aggregation reorder buffer sizes for different sessions,
710 	 * our ucode doesn't allow for that and has a global limit
711 	 * for each station. Therefore, use the minimum of all the
712 	 * aggregation sessions and our default value.
713 	 */
714 	sta_priv->max_agg_bufsize =
715 		min(sta_priv->max_agg_bufsize, buf_size);
716 
717 	if (priv->hw_params.use_rts_for_aggregation) {
718 		/*
719 		 * switch to RTS/CTS if it is the prefer protection
720 		 * method for HT traffic
721 		 */
722 
723 		sta_priv->lq_sta.lq.general_params.flags |=
724 			LINK_QUAL_FLAGS_SET_STA_TLC_RTS_MSK;
725 	}
726 	priv->agg_tids_count++;
727 	IWL_DEBUG_HT(priv, "priv->agg_tids_count = %u\n",
728 		     priv->agg_tids_count);
729 
730 	sta_priv->lq_sta.lq.agg_params.agg_frame_cnt_limit =
731 		sta_priv->max_agg_bufsize;
732 
733 	IWL_DEBUG_HT(priv, "Tx aggregation enabled on ra = %pM tid = %d\n",
734 		 sta->addr, tid);
735 
736 	return iwl_send_lq_cmd(priv, ctx,
737 			&sta_priv->lq_sta.lq, CMD_ASYNC, false);
738 }
739 
iwlagn_check_ratid_empty(struct iwl_priv * priv,int sta_id,u8 tid)740 static void iwlagn_check_ratid_empty(struct iwl_priv *priv, int sta_id, u8 tid)
741 {
742 	struct iwl_tid_data *tid_data = &priv->tid_data[sta_id][tid];
743 	enum iwl_rxon_context_id ctx;
744 	struct ieee80211_vif *vif;
745 	u8 *addr;
746 
747 	lockdep_assert_held(&priv->sta_lock);
748 
749 	addr = priv->stations[sta_id].sta.sta.addr;
750 	ctx = priv->stations[sta_id].ctxid;
751 	vif = priv->contexts[ctx].vif;
752 
753 	switch (priv->tid_data[sta_id][tid].agg.state) {
754 	case IWL_EMPTYING_HW_QUEUE_DELBA:
755 		/* There are no packets for this RA / TID in the HW any more */
756 		if (tid_data->agg.ssn == tid_data->next_reclaimed) {
757 			IWL_DEBUG_TX_QUEUES(priv,
758 				"Can continue DELBA flow ssn = next_recl = %d\n",
759 				tid_data->next_reclaimed);
760 			iwl_trans_txq_disable(priv->trans,
761 					      tid_data->agg.txq_id, true);
762 			iwlagn_dealloc_agg_txq(priv, tid_data->agg.txq_id);
763 			tid_data->agg.state = IWL_AGG_OFF;
764 			ieee80211_stop_tx_ba_cb_irqsafe(vif, addr, tid);
765 		}
766 		break;
767 	case IWL_EMPTYING_HW_QUEUE_ADDBA:
768 		/* There are no packets for this RA / TID in the HW any more */
769 		if (tid_data->agg.ssn == tid_data->next_reclaimed) {
770 			IWL_DEBUG_TX_QUEUES(priv,
771 				"Can continue ADDBA flow ssn = next_recl = %d\n",
772 				tid_data->next_reclaimed);
773 			tid_data->agg.state = IWL_AGG_STARTING;
774 			ieee80211_start_tx_ba_cb_irqsafe(vif, addr, tid);
775 		}
776 		break;
777 	default:
778 		break;
779 	}
780 }
781 
iwlagn_non_agg_tx_status(struct iwl_priv * priv,struct iwl_rxon_context * ctx,const u8 * addr1)782 static void iwlagn_non_agg_tx_status(struct iwl_priv *priv,
783 				     struct iwl_rxon_context *ctx,
784 				     const u8 *addr1)
785 {
786 	struct ieee80211_sta *sta;
787 	struct iwl_station_priv *sta_priv;
788 
789 	rcu_read_lock();
790 	sta = ieee80211_find_sta(ctx->vif, addr1);
791 	if (sta) {
792 		sta_priv = (void *)sta->drv_priv;
793 		/* avoid atomic ops if this isn't a client */
794 		if (sta_priv->client &&
795 		    atomic_dec_return(&sta_priv->pending_frames) == 0)
796 			ieee80211_sta_block_awake(priv->hw, sta, false);
797 	}
798 	rcu_read_unlock();
799 }
800 
801 /*
802  * translate ucode response to mac80211 tx status control values
803  */
iwlagn_hwrate_to_tx_control(struct iwl_priv * priv,u32 rate_n_flags,struct ieee80211_tx_info * info)804 static void iwlagn_hwrate_to_tx_control(struct iwl_priv *priv, u32 rate_n_flags,
805 				  struct ieee80211_tx_info *info)
806 {
807 	struct ieee80211_tx_rate *r = &info->status.rates[0];
808 
809 	info->status.antenna =
810 		((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
811 	if (rate_n_flags & RATE_MCS_HT_MSK)
812 		r->flags |= IEEE80211_TX_RC_MCS;
813 	if (rate_n_flags & RATE_MCS_GF_MSK)
814 		r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
815 	if (rate_n_flags & RATE_MCS_HT40_MSK)
816 		r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
817 	if (rate_n_flags & RATE_MCS_DUP_MSK)
818 		r->flags |= IEEE80211_TX_RC_DUP_DATA;
819 	if (rate_n_flags & RATE_MCS_SGI_MSK)
820 		r->flags |= IEEE80211_TX_RC_SHORT_GI;
821 	r->idx = iwlagn_hwrate_to_mac80211_idx(rate_n_flags, info->band);
822 }
823 
824 #ifdef CONFIG_IWLWIFI_DEBUG
iwl_get_tx_fail_reason(u32 status)825 const char *iwl_get_tx_fail_reason(u32 status)
826 {
827 #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
828 #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
829 
830 	switch (status & TX_STATUS_MSK) {
831 	case TX_STATUS_SUCCESS:
832 		return "SUCCESS";
833 	TX_STATUS_POSTPONE(DELAY);
834 	TX_STATUS_POSTPONE(FEW_BYTES);
835 	TX_STATUS_POSTPONE(BT_PRIO);
836 	TX_STATUS_POSTPONE(QUIET_PERIOD);
837 	TX_STATUS_POSTPONE(CALC_TTAK);
838 	TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
839 	TX_STATUS_FAIL(SHORT_LIMIT);
840 	TX_STATUS_FAIL(LONG_LIMIT);
841 	TX_STATUS_FAIL(FIFO_UNDERRUN);
842 	TX_STATUS_FAIL(DRAIN_FLOW);
843 	TX_STATUS_FAIL(RFKILL_FLUSH);
844 	TX_STATUS_FAIL(LIFE_EXPIRE);
845 	TX_STATUS_FAIL(DEST_PS);
846 	TX_STATUS_FAIL(HOST_ABORTED);
847 	TX_STATUS_FAIL(BT_RETRY);
848 	TX_STATUS_FAIL(STA_INVALID);
849 	TX_STATUS_FAIL(FRAG_DROPPED);
850 	TX_STATUS_FAIL(TID_DISABLE);
851 	TX_STATUS_FAIL(FIFO_FLUSHED);
852 	TX_STATUS_FAIL(INSUFFICIENT_CF_POLL);
853 	TX_STATUS_FAIL(PASSIVE_NO_RX);
854 	TX_STATUS_FAIL(NO_BEACON_ON_RADAR);
855 	}
856 
857 	return "UNKNOWN";
858 
859 #undef TX_STATUS_FAIL
860 #undef TX_STATUS_POSTPONE
861 }
862 #endif /* CONFIG_IWLWIFI_DEBUG */
863 
iwlagn_count_agg_tx_err_status(struct iwl_priv * priv,u16 status)864 static void iwlagn_count_agg_tx_err_status(struct iwl_priv *priv, u16 status)
865 {
866 	status &= AGG_TX_STATUS_MSK;
867 
868 	switch (status) {
869 	case AGG_TX_STATE_UNDERRUN_MSK:
870 		priv->reply_agg_tx_stats.underrun++;
871 		break;
872 	case AGG_TX_STATE_BT_PRIO_MSK:
873 		priv->reply_agg_tx_stats.bt_prio++;
874 		break;
875 	case AGG_TX_STATE_FEW_BYTES_MSK:
876 		priv->reply_agg_tx_stats.few_bytes++;
877 		break;
878 	case AGG_TX_STATE_ABORT_MSK:
879 		priv->reply_agg_tx_stats.abort++;
880 		break;
881 	case AGG_TX_STATE_LAST_SENT_TTL_MSK:
882 		priv->reply_agg_tx_stats.last_sent_ttl++;
883 		break;
884 	case AGG_TX_STATE_LAST_SENT_TRY_CNT_MSK:
885 		priv->reply_agg_tx_stats.last_sent_try++;
886 		break;
887 	case AGG_TX_STATE_LAST_SENT_BT_KILL_MSK:
888 		priv->reply_agg_tx_stats.last_sent_bt_kill++;
889 		break;
890 	case AGG_TX_STATE_SCD_QUERY_MSK:
891 		priv->reply_agg_tx_stats.scd_query++;
892 		break;
893 	case AGG_TX_STATE_TEST_BAD_CRC32_MSK:
894 		priv->reply_agg_tx_stats.bad_crc32++;
895 		break;
896 	case AGG_TX_STATE_RESPONSE_MSK:
897 		priv->reply_agg_tx_stats.response++;
898 		break;
899 	case AGG_TX_STATE_DUMP_TX_MSK:
900 		priv->reply_agg_tx_stats.dump_tx++;
901 		break;
902 	case AGG_TX_STATE_DELAY_TX_MSK:
903 		priv->reply_agg_tx_stats.delay_tx++;
904 		break;
905 	default:
906 		priv->reply_agg_tx_stats.unknown++;
907 		break;
908 	}
909 }
910 
iwlagn_get_scd_ssn(struct iwlagn_tx_resp * tx_resp)911 static inline u32 iwlagn_get_scd_ssn(struct iwlagn_tx_resp *tx_resp)
912 {
913 	return le32_to_cpup((__le32 *)&tx_resp->status +
914 			    tx_resp->frame_count) & IEEE80211_MAX_SN;
915 }
916 
iwl_rx_reply_tx_agg(struct iwl_priv * priv,struct iwlagn_tx_resp * tx_resp)917 static void iwl_rx_reply_tx_agg(struct iwl_priv *priv,
918 				struct iwlagn_tx_resp *tx_resp)
919 {
920 	struct agg_tx_status *frame_status = &tx_resp->status;
921 	int tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
922 		IWLAGN_TX_RES_TID_POS;
923 	int sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
924 		IWLAGN_TX_RES_RA_POS;
925 	struct iwl_ht_agg *agg = &priv->tid_data[sta_id][tid].agg;
926 	u32 status = le16_to_cpu(tx_resp->status.status);
927 	int i;
928 
929 	WARN_ON(tid == IWL_TID_NON_QOS);
930 
931 	if (agg->wait_for_ba)
932 		IWL_DEBUG_TX_REPLY(priv,
933 			"got tx response w/o block-ack\n");
934 
935 	agg->rate_n_flags = le32_to_cpu(tx_resp->rate_n_flags);
936 	agg->wait_for_ba = (tx_resp->frame_count > 1);
937 
938 	/*
939 	 * If the BT kill count is non-zero, we'll get this
940 	 * notification again.
941 	 */
942 	if (tx_resp->bt_kill_count && tx_resp->frame_count == 1 &&
943 	    priv->lib->bt_params &&
944 	    priv->lib->bt_params->advanced_bt_coexist) {
945 		IWL_DEBUG_COEX(priv, "receive reply tx w/ bt_kill\n");
946 	}
947 
948 	if (tx_resp->frame_count == 1)
949 		return;
950 
951 	IWL_DEBUG_TX_REPLY(priv, "TXQ %d initial_rate 0x%x ssn %d frm_cnt %d\n",
952 			   agg->txq_id,
953 			   le32_to_cpu(tx_resp->rate_n_flags),
954 			   iwlagn_get_scd_ssn(tx_resp), tx_resp->frame_count);
955 
956 	/* Construct bit-map of pending frames within Tx window */
957 	for (i = 0; i < tx_resp->frame_count; i++) {
958 		u16 fstatus = le16_to_cpu(frame_status[i].status);
959 		u8 retry_cnt = (fstatus & AGG_TX_TRY_MSK) >> AGG_TX_TRY_POS;
960 
961 		if (status & AGG_TX_STATUS_MSK)
962 			iwlagn_count_agg_tx_err_status(priv, fstatus);
963 
964 		if (status & (AGG_TX_STATE_FEW_BYTES_MSK |
965 			      AGG_TX_STATE_ABORT_MSK))
966 			continue;
967 
968 		if (status & AGG_TX_STATUS_MSK || retry_cnt > 1)
969 			IWL_DEBUG_TX_REPLY(priv,
970 					   "%d: status %s (0x%04x), try-count (0x%01x)\n",
971 					   i,
972 					   iwl_get_agg_tx_fail_reason(fstatus),
973 					   fstatus & AGG_TX_STATUS_MSK,
974 					   retry_cnt);
975 	}
976 }
977 
978 #ifdef CONFIG_IWLWIFI_DEBUG
979 #define AGG_TX_STATE_FAIL(x) case AGG_TX_STATE_ ## x: return #x
980 
iwl_get_agg_tx_fail_reason(u16 status)981 const char *iwl_get_agg_tx_fail_reason(u16 status)
982 {
983 	status &= AGG_TX_STATUS_MSK;
984 	switch (status) {
985 	case AGG_TX_STATE_TRANSMITTED:
986 		return "SUCCESS";
987 		AGG_TX_STATE_FAIL(UNDERRUN_MSK);
988 		AGG_TX_STATE_FAIL(BT_PRIO_MSK);
989 		AGG_TX_STATE_FAIL(FEW_BYTES_MSK);
990 		AGG_TX_STATE_FAIL(ABORT_MSK);
991 		AGG_TX_STATE_FAIL(LAST_SENT_TTL_MSK);
992 		AGG_TX_STATE_FAIL(LAST_SENT_TRY_CNT_MSK);
993 		AGG_TX_STATE_FAIL(LAST_SENT_BT_KILL_MSK);
994 		AGG_TX_STATE_FAIL(SCD_QUERY_MSK);
995 		AGG_TX_STATE_FAIL(TEST_BAD_CRC32_MSK);
996 		AGG_TX_STATE_FAIL(RESPONSE_MSK);
997 		AGG_TX_STATE_FAIL(DUMP_TX_MSK);
998 		AGG_TX_STATE_FAIL(DELAY_TX_MSK);
999 	}
1000 
1001 	return "UNKNOWN";
1002 }
1003 #endif /* CONFIG_IWLWIFI_DEBUG */
1004 
iwlagn_count_tx_err_status(struct iwl_priv * priv,u16 status)1005 static void iwlagn_count_tx_err_status(struct iwl_priv *priv, u16 status)
1006 {
1007 	status &= TX_STATUS_MSK;
1008 
1009 	switch (status) {
1010 	case TX_STATUS_POSTPONE_DELAY:
1011 		priv->reply_tx_stats.pp_delay++;
1012 		break;
1013 	case TX_STATUS_POSTPONE_FEW_BYTES:
1014 		priv->reply_tx_stats.pp_few_bytes++;
1015 		break;
1016 	case TX_STATUS_POSTPONE_BT_PRIO:
1017 		priv->reply_tx_stats.pp_bt_prio++;
1018 		break;
1019 	case TX_STATUS_POSTPONE_QUIET_PERIOD:
1020 		priv->reply_tx_stats.pp_quiet_period++;
1021 		break;
1022 	case TX_STATUS_POSTPONE_CALC_TTAK:
1023 		priv->reply_tx_stats.pp_calc_ttak++;
1024 		break;
1025 	case TX_STATUS_FAIL_INTERNAL_CROSSED_RETRY:
1026 		priv->reply_tx_stats.int_crossed_retry++;
1027 		break;
1028 	case TX_STATUS_FAIL_SHORT_LIMIT:
1029 		priv->reply_tx_stats.short_limit++;
1030 		break;
1031 	case TX_STATUS_FAIL_LONG_LIMIT:
1032 		priv->reply_tx_stats.long_limit++;
1033 		break;
1034 	case TX_STATUS_FAIL_FIFO_UNDERRUN:
1035 		priv->reply_tx_stats.fifo_underrun++;
1036 		break;
1037 	case TX_STATUS_FAIL_DRAIN_FLOW:
1038 		priv->reply_tx_stats.drain_flow++;
1039 		break;
1040 	case TX_STATUS_FAIL_RFKILL_FLUSH:
1041 		priv->reply_tx_stats.rfkill_flush++;
1042 		break;
1043 	case TX_STATUS_FAIL_LIFE_EXPIRE:
1044 		priv->reply_tx_stats.life_expire++;
1045 		break;
1046 	case TX_STATUS_FAIL_DEST_PS:
1047 		priv->reply_tx_stats.dest_ps++;
1048 		break;
1049 	case TX_STATUS_FAIL_HOST_ABORTED:
1050 		priv->reply_tx_stats.host_abort++;
1051 		break;
1052 	case TX_STATUS_FAIL_BT_RETRY:
1053 		priv->reply_tx_stats.bt_retry++;
1054 		break;
1055 	case TX_STATUS_FAIL_STA_INVALID:
1056 		priv->reply_tx_stats.sta_invalid++;
1057 		break;
1058 	case TX_STATUS_FAIL_FRAG_DROPPED:
1059 		priv->reply_tx_stats.frag_drop++;
1060 		break;
1061 	case TX_STATUS_FAIL_TID_DISABLE:
1062 		priv->reply_tx_stats.tid_disable++;
1063 		break;
1064 	case TX_STATUS_FAIL_FIFO_FLUSHED:
1065 		priv->reply_tx_stats.fifo_flush++;
1066 		break;
1067 	case TX_STATUS_FAIL_INSUFFICIENT_CF_POLL:
1068 		priv->reply_tx_stats.insuff_cf_poll++;
1069 		break;
1070 	case TX_STATUS_FAIL_PASSIVE_NO_RX:
1071 		priv->reply_tx_stats.fail_hw_drop++;
1072 		break;
1073 	case TX_STATUS_FAIL_NO_BEACON_ON_RADAR:
1074 		priv->reply_tx_stats.sta_color_mismatch++;
1075 		break;
1076 	default:
1077 		priv->reply_tx_stats.unknown++;
1078 		break;
1079 	}
1080 }
1081 
iwlagn_set_tx_status(struct iwl_priv * priv,struct ieee80211_tx_info * info,struct iwlagn_tx_resp * tx_resp)1082 static void iwlagn_set_tx_status(struct iwl_priv *priv,
1083 				 struct ieee80211_tx_info *info,
1084 				 struct iwlagn_tx_resp *tx_resp)
1085 {
1086 	u16 status = le16_to_cpu(tx_resp->status.status);
1087 
1088 	info->flags &= ~IEEE80211_TX_CTL_AMPDU;
1089 
1090 	info->status.rates[0].count = tx_resp->failure_frame + 1;
1091 	info->flags |= iwl_tx_status_to_mac80211(status);
1092 	iwlagn_hwrate_to_tx_control(priv, le32_to_cpu(tx_resp->rate_n_flags),
1093 				    info);
1094 	if (!iwl_is_tx_success(status))
1095 		iwlagn_count_tx_err_status(priv, status);
1096 }
1097 
iwl_check_abort_status(struct iwl_priv * priv,u8 frame_count,u32 status)1098 static void iwl_check_abort_status(struct iwl_priv *priv,
1099 			    u8 frame_count, u32 status)
1100 {
1101 	if (frame_count == 1 && status == TX_STATUS_FAIL_RFKILL_FLUSH) {
1102 		IWL_ERR(priv, "Tx flush command to flush out all frames\n");
1103 		if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
1104 			queue_work(priv->workqueue, &priv->tx_flush);
1105 	}
1106 }
1107 
iwlagn_rx_reply_tx(struct iwl_priv * priv,struct iwl_rx_cmd_buffer * rxb)1108 void iwlagn_rx_reply_tx(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb)
1109 {
1110 	struct iwl_rx_packet *pkt = rxb_addr(rxb);
1111 	u16 sequence = le16_to_cpu(pkt->hdr.sequence);
1112 	int txq_id = SEQ_TO_QUEUE(sequence);
1113 	int cmd_index __maybe_unused = SEQ_TO_INDEX(sequence);
1114 	struct iwlagn_tx_resp *tx_resp = (void *)pkt->data;
1115 	struct ieee80211_hdr *hdr;
1116 	u32 status = le16_to_cpu(tx_resp->status.status);
1117 	u16 ssn = iwlagn_get_scd_ssn(tx_resp);
1118 	int tid;
1119 	int sta_id;
1120 	int freed;
1121 	struct ieee80211_tx_info *info;
1122 	struct sk_buff_head skbs;
1123 	struct sk_buff *skb;
1124 	struct iwl_rxon_context *ctx;
1125 	bool is_agg = (txq_id >= IWLAGN_FIRST_AMPDU_QUEUE);
1126 
1127 	tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
1128 		IWLAGN_TX_RES_TID_POS;
1129 	sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
1130 		IWLAGN_TX_RES_RA_POS;
1131 
1132 	spin_lock_bh(&priv->sta_lock);
1133 
1134 	if (is_agg) {
1135 		WARN_ON_ONCE(sta_id >= IWLAGN_STATION_COUNT ||
1136 			     tid >= IWL_MAX_TID_COUNT);
1137 		if (txq_id != priv->tid_data[sta_id][tid].agg.txq_id)
1138 			IWL_ERR(priv, "txq_id mismatch: %d %d\n", txq_id,
1139 				priv->tid_data[sta_id][tid].agg.txq_id);
1140 		iwl_rx_reply_tx_agg(priv, tx_resp);
1141 	}
1142 
1143 	__skb_queue_head_init(&skbs);
1144 
1145 	if (tx_resp->frame_count == 1) {
1146 		u16 next_reclaimed = le16_to_cpu(tx_resp->seq_ctl);
1147 		next_reclaimed = IEEE80211_SEQ_TO_SN(next_reclaimed + 0x10);
1148 
1149 		if (is_agg) {
1150 			/* If this is an aggregation queue, we can rely on the
1151 			 * ssn since the wifi sequence number corresponds to
1152 			 * the index in the TFD ring (%256).
1153 			 * The seq_ctl is the sequence control of the packet
1154 			 * to which this Tx response relates. But if there is a
1155 			 * hole in the bitmap of the BA we received, this Tx
1156 			 * response may allow to reclaim the hole and all the
1157 			 * subsequent packets that were already acked.
1158 			 * In that case, seq_ctl != ssn, and the next packet
1159 			 * to be reclaimed will be ssn and not seq_ctl.
1160 			 */
1161 			next_reclaimed = ssn;
1162 		}
1163 
1164 		if (tid != IWL_TID_NON_QOS) {
1165 			priv->tid_data[sta_id][tid].next_reclaimed =
1166 				next_reclaimed;
1167 			IWL_DEBUG_TX_REPLY(priv, "Next reclaimed packet:%d\n",
1168 						  next_reclaimed);
1169 			iwlagn_check_ratid_empty(priv, sta_id, tid);
1170 		}
1171 
1172 		iwl_trans_reclaim(priv->trans, txq_id, ssn, &skbs);
1173 
1174 		freed = 0;
1175 
1176 		/* process frames */
1177 		skb_queue_walk(&skbs, skb) {
1178 			hdr = (struct ieee80211_hdr *)skb->data;
1179 
1180 			if (!ieee80211_is_data_qos(hdr->frame_control))
1181 				priv->last_seq_ctl = tx_resp->seq_ctl;
1182 
1183 			info = IEEE80211_SKB_CB(skb);
1184 			ctx = info->driver_data[0];
1185 			iwl_trans_free_tx_cmd(priv->trans,
1186 					      info->driver_data[1]);
1187 
1188 			memset(&info->status, 0, sizeof(info->status));
1189 
1190 			if (status == TX_STATUS_FAIL_PASSIVE_NO_RX &&
1191 			    ctx->vif &&
1192 			    ctx->vif->type == NL80211_IFTYPE_STATION) {
1193 				/* block and stop all queues */
1194 				priv->passive_no_rx = true;
1195 				IWL_DEBUG_TX_QUEUES(priv,
1196 					"stop all queues: passive channel\n");
1197 				ieee80211_stop_queues(priv->hw);
1198 
1199 				IWL_DEBUG_TX_REPLY(priv,
1200 					   "TXQ %d status %s (0x%08x) "
1201 					   "rate_n_flags 0x%x retries %d\n",
1202 					   txq_id,
1203 					   iwl_get_tx_fail_reason(status),
1204 					   status,
1205 					   le32_to_cpu(tx_resp->rate_n_flags),
1206 					   tx_resp->failure_frame);
1207 
1208 				IWL_DEBUG_TX_REPLY(priv,
1209 					   "FrameCnt = %d, idx=%d\n",
1210 					   tx_resp->frame_count, cmd_index);
1211 			}
1212 
1213 			/* check if BAR is needed */
1214 			if (is_agg && !iwl_is_tx_success(status))
1215 				info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
1216 			iwlagn_set_tx_status(priv, IEEE80211_SKB_CB(skb),
1217 				     tx_resp);
1218 			if (!is_agg)
1219 				iwlagn_non_agg_tx_status(priv, ctx, hdr->addr1);
1220 
1221 			freed++;
1222 		}
1223 
1224 		if (tid != IWL_TID_NON_QOS) {
1225 			priv->tid_data[sta_id][tid].next_reclaimed =
1226 				next_reclaimed;
1227 			IWL_DEBUG_TX_REPLY(priv, "Next reclaimed packet:%d\n",
1228 					   next_reclaimed);
1229 		}
1230 
1231 		if (!is_agg && freed != 1)
1232 			IWL_ERR(priv, "Q: %d, freed %d\n", txq_id, freed);
1233 
1234 		IWL_DEBUG_TX_REPLY(priv, "TXQ %d status %s (0x%08x)\n", txq_id,
1235 				   iwl_get_tx_fail_reason(status), status);
1236 
1237 		IWL_DEBUG_TX_REPLY(priv,
1238 				   "\t\t\t\tinitial_rate 0x%x retries %d, idx=%d ssn=%d seq_ctl=0x%x\n",
1239 				   le32_to_cpu(tx_resp->rate_n_flags),
1240 				   tx_resp->failure_frame,
1241 				   SEQ_TO_INDEX(sequence), ssn,
1242 				   le16_to_cpu(tx_resp->seq_ctl));
1243 	}
1244 
1245 	iwl_check_abort_status(priv, tx_resp->frame_count, status);
1246 	spin_unlock_bh(&priv->sta_lock);
1247 
1248 	while (!skb_queue_empty(&skbs)) {
1249 		skb = __skb_dequeue(&skbs);
1250 		ieee80211_tx_status(priv->hw, skb);
1251 	}
1252 }
1253 
1254 /*
1255  * iwlagn_rx_reply_compressed_ba - Handler for REPLY_COMPRESSED_BA
1256  *
1257  * Handles block-acknowledge notification from device, which reports success
1258  * of frames sent via aggregation.
1259  */
iwlagn_rx_reply_compressed_ba(struct iwl_priv * priv,struct iwl_rx_cmd_buffer * rxb)1260 void iwlagn_rx_reply_compressed_ba(struct iwl_priv *priv,
1261 				   struct iwl_rx_cmd_buffer *rxb)
1262 {
1263 	struct iwl_rx_packet *pkt = rxb_addr(rxb);
1264 	struct iwl_compressed_ba_resp *ba_resp = (void *)pkt->data;
1265 	struct iwl_ht_agg *agg;
1266 	struct sk_buff_head reclaimed_skbs;
1267 	struct sk_buff *skb;
1268 	int sta_id;
1269 	int tid;
1270 	int freed;
1271 
1272 	/* "flow" corresponds to Tx queue */
1273 	u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
1274 
1275 	/* "ssn" is start of block-ack Tx window, corresponds to index
1276 	 * (in Tx queue's circular buffer) of first TFD/frame in window */
1277 	u16 ba_resp_scd_ssn = le16_to_cpu(ba_resp->scd_ssn);
1278 
1279 	if (scd_flow >= priv->trans->trans_cfg->base_params->num_of_queues) {
1280 		IWL_ERR(priv,
1281 			"BUG_ON scd_flow is bigger than number of queues\n");
1282 		return;
1283 	}
1284 
1285 	sta_id = ba_resp->sta_id;
1286 	tid = ba_resp->tid;
1287 	agg = &priv->tid_data[sta_id][tid].agg;
1288 
1289 	spin_lock_bh(&priv->sta_lock);
1290 
1291 	if (unlikely(!agg->wait_for_ba)) {
1292 		if (unlikely(ba_resp->bitmap))
1293 			IWL_ERR(priv, "Received BA when not expected\n");
1294 		spin_unlock_bh(&priv->sta_lock);
1295 		return;
1296 	}
1297 
1298 	if (unlikely(scd_flow != agg->txq_id)) {
1299 		/*
1300 		 * FIXME: this is a uCode bug which need to be addressed,
1301 		 * log the information and return for now.
1302 		 * Since it is can possibly happen very often and in order
1303 		 * not to fill the syslog, don't use IWL_ERR or IWL_WARN
1304 		 */
1305 		IWL_DEBUG_TX_QUEUES(priv,
1306 				    "Bad queue mapping txq_id=%d, agg_txq[sta:%d,tid:%d]=%d\n",
1307 				    scd_flow, sta_id, tid, agg->txq_id);
1308 		spin_unlock_bh(&priv->sta_lock);
1309 		return;
1310 	}
1311 
1312 	__skb_queue_head_init(&reclaimed_skbs);
1313 
1314 	/* Release all TFDs before the SSN, i.e. all TFDs in front of
1315 	 * block-ack window (we assume that they've been successfully
1316 	 * transmitted ... if not, it's too late anyway). */
1317 	iwl_trans_reclaim(priv->trans, scd_flow, ba_resp_scd_ssn,
1318 			  &reclaimed_skbs);
1319 
1320 	IWL_DEBUG_TX_REPLY(priv, "REPLY_COMPRESSED_BA [%d] Received from %pM, "
1321 			   "sta_id = %d\n",
1322 			   agg->wait_for_ba,
1323 			   (u8 *) &ba_resp->sta_addr_lo32,
1324 			   ba_resp->sta_id);
1325 	IWL_DEBUG_TX_REPLY(priv, "TID = %d, SeqCtl = %d, bitmap = 0x%llx, "
1326 			   "scd_flow = %d, scd_ssn = %d sent:%d, acked:%d\n",
1327 			   ba_resp->tid, le16_to_cpu(ba_resp->seq_ctl),
1328 			   (unsigned long long)le64_to_cpu(ba_resp->bitmap),
1329 			   scd_flow, ba_resp_scd_ssn, ba_resp->txed,
1330 			   ba_resp->txed_2_done);
1331 
1332 	/* Mark that the expected block-ack response arrived */
1333 	agg->wait_for_ba = false;
1334 
1335 	/* Sanity check values reported by uCode */
1336 	if (ba_resp->txed_2_done > ba_resp->txed) {
1337 		IWL_DEBUG_TX_REPLY(priv,
1338 			"bogus sent(%d) and ack(%d) count\n",
1339 			ba_resp->txed, ba_resp->txed_2_done);
1340 		/*
1341 		 * set txed_2_done = txed,
1342 		 * so it won't impact rate scale
1343 		 */
1344 		ba_resp->txed = ba_resp->txed_2_done;
1345 	}
1346 
1347 	priv->tid_data[sta_id][tid].next_reclaimed = ba_resp_scd_ssn;
1348 
1349 	iwlagn_check_ratid_empty(priv, sta_id, tid);
1350 	freed = 0;
1351 
1352 	skb_queue_walk(&reclaimed_skbs, skb) {
1353 		struct ieee80211_hdr *hdr = (void *)skb->data;
1354 		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1355 
1356 		if (ieee80211_is_data_qos(hdr->frame_control))
1357 			freed++;
1358 		else
1359 			WARN_ON_ONCE(1);
1360 
1361 		iwl_trans_free_tx_cmd(priv->trans, info->driver_data[1]);
1362 
1363 		memset(&info->status, 0, sizeof(info->status));
1364 		/* Packet was transmitted successfully, failures come as single
1365 		 * frames because before failing a frame the firmware transmits
1366 		 * it without aggregation at least once.
1367 		 */
1368 		info->flags |= IEEE80211_TX_STAT_ACK;
1369 
1370 		if (freed == 1) {
1371 			/* this is the first skb we deliver in this batch */
1372 			/* put the rate scaling data there */
1373 			info = IEEE80211_SKB_CB(skb);
1374 			memset(&info->status, 0, sizeof(info->status));
1375 			info->flags |= IEEE80211_TX_STAT_AMPDU;
1376 			info->status.ampdu_ack_len = ba_resp->txed_2_done;
1377 			info->status.ampdu_len = ba_resp->txed;
1378 			iwlagn_hwrate_to_tx_control(priv, agg->rate_n_flags,
1379 						    info);
1380 		}
1381 	}
1382 
1383 	spin_unlock_bh(&priv->sta_lock);
1384 
1385 	while (!skb_queue_empty(&reclaimed_skbs)) {
1386 		skb = __skb_dequeue(&reclaimed_skbs);
1387 		ieee80211_tx_status(priv->hw, skb);
1388 	}
1389 }
1390