1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2 /*
3  * Copyright (C) 2012-2014, 2018-2021 Intel Corporation
4  * Copyright (C) 2013-2015 Intel Mobile Communications GmbH
5  * Copyright (C) 2016-2017 Intel Deutschland GmbH
6  */
7 #include <linux/ieee80211.h>
8 #include <linux/etherdevice.h>
9 #include <linux/tcp.h>
10 #include <net/ip.h>
11 #include <net/ipv6.h>
12 
13 #include "iwl-trans.h"
14 #include "iwl-eeprom-parse.h"
15 #include "mvm.h"
16 #include "sta.h"
17 
18 static void
iwl_mvm_bar_check_trigger(struct iwl_mvm * mvm,const u8 * addr,u16 tid,u16 ssn)19 iwl_mvm_bar_check_trigger(struct iwl_mvm *mvm, const u8 *addr,
20 			  u16 tid, u16 ssn)
21 {
22 	struct iwl_fw_dbg_trigger_tlv *trig;
23 	struct iwl_fw_dbg_trigger_ba *ba_trig;
24 
25 	trig = iwl_fw_dbg_trigger_on(&mvm->fwrt, NULL, FW_DBG_TRIGGER_BA);
26 	if (!trig)
27 		return;
28 
29 	ba_trig = (void *)trig->data;
30 
31 	if (!(le16_to_cpu(ba_trig->tx_bar) & BIT(tid)))
32 		return;
33 
34 	iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
35 				"BAR sent to %pM, tid %d, ssn %d",
36 				addr, tid, ssn);
37 }
38 
39 #define OPT_HDR(type, skb, off) \
40 	(type *)(skb_network_header(skb) + (off))
41 
iwl_mvm_tx_csum_pre_bz(struct iwl_mvm * mvm,struct sk_buff * skb,struct ieee80211_tx_info * info,bool amsdu)42 static u16 iwl_mvm_tx_csum_pre_bz(struct iwl_mvm *mvm, struct sk_buff *skb,
43 				  struct ieee80211_tx_info *info, bool amsdu)
44 {
45 	struct ieee80211_hdr *hdr = (void *)skb->data;
46 	u16 offload_assist = 0;
47 #if IS_ENABLED(CONFIG_INET)
48 	u16 mh_len = ieee80211_hdrlen(hdr->frame_control);
49 	u8 protocol = 0;
50 
51 	/* Do not compute checksum if already computed */
52 	if (skb->ip_summed != CHECKSUM_PARTIAL)
53 		goto out;
54 
55 	/* We do not expect to be requested to csum stuff we do not support */
56 	if (WARN_ONCE(!(mvm->hw->netdev_features & IWL_TX_CSUM_NETIF_FLAGS) ||
57 		      (skb->protocol != htons(ETH_P_IP) &&
58 		       skb->protocol != htons(ETH_P_IPV6)),
59 		      "No support for requested checksum\n")) {
60 		skb_checksum_help(skb);
61 		goto out;
62 	}
63 
64 	if (skb->protocol == htons(ETH_P_IP)) {
65 		protocol = ip_hdr(skb)->protocol;
66 	} else {
67 #if IS_ENABLED(CONFIG_IPV6)
68 		struct ipv6hdr *ipv6h =
69 			(struct ipv6hdr *)skb_network_header(skb);
70 		unsigned int off = sizeof(*ipv6h);
71 
72 		protocol = ipv6h->nexthdr;
73 		while (protocol != NEXTHDR_NONE && ipv6_ext_hdr(protocol)) {
74 			struct ipv6_opt_hdr *hp;
75 
76 			/* only supported extension headers */
77 			if (protocol != NEXTHDR_ROUTING &&
78 			    protocol != NEXTHDR_HOP &&
79 			    protocol != NEXTHDR_DEST) {
80 				skb_checksum_help(skb);
81 				goto out;
82 			}
83 
84 			hp = OPT_HDR(struct ipv6_opt_hdr, skb, off);
85 			protocol = hp->nexthdr;
86 			off += ipv6_optlen(hp);
87 		}
88 		/* if we get here - protocol now should be TCP/UDP */
89 #endif
90 	}
91 
92 	if (protocol != IPPROTO_TCP && protocol != IPPROTO_UDP) {
93 		WARN_ON_ONCE(1);
94 		skb_checksum_help(skb);
95 		goto out;
96 	}
97 
98 	/* enable L4 csum */
99 	offload_assist |= BIT(TX_CMD_OFFLD_L4_EN);
100 
101 	/*
102 	 * Set offset to IP header (snap).
103 	 * We don't support tunneling so no need to take care of inner header.
104 	 * Size is in words.
105 	 */
106 	offload_assist |= (4 << TX_CMD_OFFLD_IP_HDR);
107 
108 	/* Do IPv4 csum for AMSDU only (no IP csum for Ipv6) */
109 	if (skb->protocol == htons(ETH_P_IP) && amsdu) {
110 		ip_hdr(skb)->check = 0;
111 		offload_assist |= BIT(TX_CMD_OFFLD_L3_EN);
112 	}
113 
114 	/* reset UDP/TCP header csum */
115 	if (protocol == IPPROTO_TCP)
116 		tcp_hdr(skb)->check = 0;
117 	else
118 		udp_hdr(skb)->check = 0;
119 
120 	/*
121 	 * mac header len should include IV, size is in words unless
122 	 * the IV is added by the firmware like in WEP.
123 	 * In new Tx API, the IV is always added by the firmware.
124 	 */
125 	if (!iwl_mvm_has_new_tx_api(mvm) && info->control.hw_key &&
126 	    info->control.hw_key->cipher != WLAN_CIPHER_SUITE_WEP40 &&
127 	    info->control.hw_key->cipher != WLAN_CIPHER_SUITE_WEP104)
128 		mh_len += info->control.hw_key->iv_len;
129 	mh_len /= 2;
130 	offload_assist |= mh_len << TX_CMD_OFFLD_MH_SIZE;
131 
132 out:
133 #endif
134 	if (amsdu)
135 		offload_assist |= BIT(TX_CMD_OFFLD_AMSDU);
136 	else if (ieee80211_hdrlen(hdr->frame_control) % 4)
137 		/* padding is inserted later in transport */
138 		offload_assist |= BIT(TX_CMD_OFFLD_PAD);
139 
140 	return offload_assist;
141 }
142 
iwl_mvm_tx_csum_bz(struct iwl_mvm * mvm,struct sk_buff * skb,bool amsdu)143 u32 iwl_mvm_tx_csum_bz(struct iwl_mvm *mvm, struct sk_buff *skb, bool amsdu)
144 {
145 	struct ieee80211_hdr *hdr = (void *)skb->data;
146 	u32 offload_assist = IWL_TX_CMD_OFFLD_BZ_PARTIAL_CSUM;
147 	unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control);
148 	unsigned int csum_start = skb_checksum_start_offset(skb);
149 
150 	offload_assist |= u32_encode_bits(hdrlen / 2,
151 					  IWL_TX_CMD_OFFLD_BZ_MH_LEN);
152 	if (amsdu)
153 		offload_assist |= IWL_TX_CMD_OFFLD_BZ_AMSDU;
154 	else if (hdrlen % 4)
155 		/* padding is inserted later in transport */
156 		offload_assist |= IWL_TX_CMD_OFFLD_BZ_MH_PAD;
157 
158 	if (skb->ip_summed != CHECKSUM_PARTIAL)
159 		return offload_assist;
160 
161 	offload_assist |= IWL_TX_CMD_OFFLD_BZ_ENABLE_CSUM |
162 			  IWL_TX_CMD_OFFLD_BZ_ZERO2ONES;
163 
164 	/*
165 	 * mac80211 will always calculate checksum in software for
166 	 * non-fast-xmit, and so we can only do offloaded checksum
167 	 * for fast-xmit frames. In this case, we always have the
168 	 * RFC 1042 header present. skb_checksum_start_offset()
169 	 * returns the offset from the beginning, but the hardware
170 	 * needs it from after the header & SNAP header.
171 	 */
172 	csum_start -= hdrlen + 8;
173 
174 	offload_assist |= u32_encode_bits(csum_start,
175 					  IWL_TX_CMD_OFFLD_BZ_START_OFFS);
176 	offload_assist |= u32_encode_bits(csum_start + skb->csum_offset,
177 					  IWL_TX_CMD_OFFLD_BZ_RESULT_OFFS);
178 
179 	return offload_assist;
180 }
181 
iwl_mvm_tx_csum(struct iwl_mvm * mvm,struct sk_buff * skb,struct ieee80211_tx_info * info,bool amsdu)182 static u32 iwl_mvm_tx_csum(struct iwl_mvm *mvm, struct sk_buff *skb,
183 			   struct ieee80211_tx_info *info,
184 			   bool amsdu)
185 {
186 	if (mvm->trans->trans_cfg->device_family < IWL_DEVICE_FAMILY_BZ)
187 		return iwl_mvm_tx_csum_pre_bz(mvm, skb, info, amsdu);
188 	return iwl_mvm_tx_csum_bz(mvm, skb, amsdu);
189 }
190 
191 /*
192  * Sets most of the Tx cmd's fields
193  */
iwl_mvm_set_tx_cmd(struct iwl_mvm * mvm,struct sk_buff * skb,struct iwl_tx_cmd * tx_cmd,struct ieee80211_tx_info * info,u8 sta_id)194 void iwl_mvm_set_tx_cmd(struct iwl_mvm *mvm, struct sk_buff *skb,
195 			struct iwl_tx_cmd *tx_cmd,
196 			struct ieee80211_tx_info *info, u8 sta_id)
197 {
198 	struct ieee80211_hdr *hdr = (void *)skb->data;
199 	__le16 fc = hdr->frame_control;
200 	u32 tx_flags = le32_to_cpu(tx_cmd->tx_flags);
201 	u32 len = skb->len + FCS_LEN;
202 	bool amsdu = false;
203 	u8 ac;
204 
205 	if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) ||
206 	    (ieee80211_is_probe_resp(fc) &&
207 	     !is_multicast_ether_addr(hdr->addr1)))
208 		tx_flags |= TX_CMD_FLG_ACK;
209 	else
210 		tx_flags &= ~TX_CMD_FLG_ACK;
211 
212 	if (ieee80211_is_probe_resp(fc))
213 		tx_flags |= TX_CMD_FLG_TSF;
214 
215 	if (ieee80211_has_morefrags(fc))
216 		tx_flags |= TX_CMD_FLG_MORE_FRAG;
217 
218 	if (ieee80211_is_data_qos(fc)) {
219 		u8 *qc = ieee80211_get_qos_ctl(hdr);
220 		tx_cmd->tid_tspec = qc[0] & 0xf;
221 		tx_flags &= ~TX_CMD_FLG_SEQ_CTL;
222 		amsdu = *qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT;
223 	} else if (ieee80211_is_back_req(fc)) {
224 		struct ieee80211_bar *bar = (void *)skb->data;
225 		u16 control = le16_to_cpu(bar->control);
226 		u16 ssn = le16_to_cpu(bar->start_seq_num);
227 
228 		tx_flags |= TX_CMD_FLG_ACK | TX_CMD_FLG_BAR;
229 		tx_cmd->tid_tspec = (control &
230 				     IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
231 			IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
232 		WARN_ON_ONCE(tx_cmd->tid_tspec >= IWL_MAX_TID_COUNT);
233 		iwl_mvm_bar_check_trigger(mvm, bar->ra, tx_cmd->tid_tspec,
234 					  ssn);
235 	} else {
236 		if (ieee80211_is_data(fc))
237 			tx_cmd->tid_tspec = IWL_TID_NON_QOS;
238 		else
239 			tx_cmd->tid_tspec = IWL_MAX_TID_COUNT;
240 
241 		if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
242 			tx_flags |= TX_CMD_FLG_SEQ_CTL;
243 		else
244 			tx_flags &= ~TX_CMD_FLG_SEQ_CTL;
245 	}
246 
247 	/* Default to 0 (BE) when tid_spec is set to IWL_MAX_TID_COUNT */
248 	if (tx_cmd->tid_tspec < IWL_MAX_TID_COUNT)
249 		ac = tid_to_mac80211_ac[tx_cmd->tid_tspec];
250 	else
251 		ac = tid_to_mac80211_ac[0];
252 
253 	tx_flags |= iwl_mvm_bt_coex_tx_prio(mvm, hdr, info, ac) <<
254 			TX_CMD_FLG_BT_PRIO_POS;
255 
256 	if (ieee80211_is_mgmt(fc)) {
257 		if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
258 			tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_ASSOC);
259 		else if (ieee80211_is_action(fc))
260 			tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_NONE);
261 		else
262 			tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_MGMT);
263 
264 		/* The spec allows Action frames in A-MPDU, we don't support
265 		 * it
266 		 */
267 		WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_AMPDU);
268 	} else if (info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO) {
269 		tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_MGMT);
270 	} else {
271 		tx_cmd->pm_frame_timeout = cpu_to_le16(PM_FRAME_NONE);
272 	}
273 
274 	if (ieee80211_is_data(fc) && len > mvm->rts_threshold &&
275 	    !is_multicast_ether_addr(hdr->addr1))
276 		tx_flags |= TX_CMD_FLG_PROT_REQUIRE;
277 
278 	if (fw_has_capa(&mvm->fw->ucode_capa,
279 			IWL_UCODE_TLV_CAPA_TXPOWER_INSERTION_SUPPORT) &&
280 	    ieee80211_action_contains_tpc(skb))
281 		tx_flags |= TX_CMD_FLG_WRITE_TX_POWER;
282 
283 	tx_cmd->tx_flags = cpu_to_le32(tx_flags);
284 	/* Total # bytes to be transmitted - PCIe code will adjust for A-MSDU */
285 	tx_cmd->len = cpu_to_le16((u16)skb->len);
286 	tx_cmd->life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
287 	tx_cmd->sta_id = sta_id;
288 
289 	tx_cmd->offload_assist =
290 		cpu_to_le16(iwl_mvm_tx_csum_pre_bz(mvm, skb, info, amsdu));
291 }
292 
iwl_mvm_get_tx_ant(struct iwl_mvm * mvm,struct ieee80211_tx_info * info,struct ieee80211_sta * sta,__le16 fc)293 static u32 iwl_mvm_get_tx_ant(struct iwl_mvm *mvm,
294 			      struct ieee80211_tx_info *info,
295 			      struct ieee80211_sta *sta, __le16 fc)
296 {
297 	if (info->band == NL80211_BAND_2GHZ &&
298 	    !iwl_mvm_bt_coex_is_shared_ant_avail(mvm))
299 		return mvm->cfg->non_shared_ant << RATE_MCS_ANT_POS;
300 
301 	if (sta && ieee80211_is_data(fc)) {
302 		struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
303 
304 		return BIT(mvmsta->tx_ant) << RATE_MCS_ANT_POS;
305 	}
306 
307 	return BIT(mvm->mgmt_last_antenna_idx) << RATE_MCS_ANT_POS;
308 }
309 
iwl_mvm_get_tx_rate(struct iwl_mvm * mvm,struct ieee80211_tx_info * info,struct ieee80211_sta * sta,__le16 fc)310 static u32 iwl_mvm_get_tx_rate(struct iwl_mvm *mvm,
311 			       struct ieee80211_tx_info *info,
312 			       struct ieee80211_sta *sta, __le16 fc)
313 {
314 	int rate_idx = -1;
315 	u8 rate_plcp;
316 	u32 rate_flags = 0;
317 	bool is_cck;
318 
319 	/* info->control is only relevant for non HW rate control */
320 	if (!ieee80211_hw_check(mvm->hw, HAS_RATE_CONTROL)) {
321 		/* HT rate doesn't make sense for a non data frame */
322 		WARN_ONCE(info->control.rates[0].flags & IEEE80211_TX_RC_MCS &&
323 			  !ieee80211_is_data(fc),
324 			  "Got a HT rate (flags:0x%x/mcs:%d/fc:0x%x/state:%d) for a non data frame\n",
325 			  info->control.rates[0].flags,
326 			  info->control.rates[0].idx,
327 			  le16_to_cpu(fc),
328 			  sta ? iwl_mvm_sta_from_mac80211(sta)->sta_state : -1);
329 
330 		rate_idx = info->control.rates[0].idx;
331 	}
332 
333 	/* if the rate isn't a well known legacy rate, take the lowest one */
334 	if (rate_idx < 0 || rate_idx >= IWL_RATE_COUNT_LEGACY)
335 		rate_idx = rate_lowest_index(
336 				&mvm->nvm_data->bands[info->band], sta);
337 
338 	/*
339 	 * For non 2 GHZ band, remap mac80211 rate
340 	 * indices into driver indices
341 	 */
342 	if (info->band != NL80211_BAND_2GHZ)
343 		rate_idx += IWL_FIRST_OFDM_RATE;
344 
345 	/* For 2.4 GHZ band, check that there is no need to remap */
346 	BUILD_BUG_ON(IWL_FIRST_CCK_RATE != 0);
347 
348 	/* Get PLCP rate for tx_cmd->rate_n_flags */
349 	rate_plcp = iwl_mvm_mac80211_idx_to_hwrate(mvm->fw, rate_idx);
350 	is_cck = (rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE);
351 
352 	/* Set CCK or OFDM flag */
353 	if (iwl_fw_lookup_cmd_ver(mvm->fw, TX_CMD, 0) > 8) {
354 		if (!is_cck)
355 			rate_flags |= RATE_MCS_LEGACY_OFDM_MSK;
356 		else
357 			rate_flags |= RATE_MCS_CCK_MSK;
358 	} else if (is_cck) {
359 		rate_flags |= RATE_MCS_CCK_MSK_V1;
360 	}
361 
362 	return (u32)rate_plcp | rate_flags;
363 }
364 
iwl_mvm_get_tx_rate_n_flags(struct iwl_mvm * mvm,struct ieee80211_tx_info * info,struct ieee80211_sta * sta,__le16 fc)365 static u32 iwl_mvm_get_tx_rate_n_flags(struct iwl_mvm *mvm,
366 				       struct ieee80211_tx_info *info,
367 				       struct ieee80211_sta *sta, __le16 fc)
368 {
369 	return iwl_mvm_get_tx_rate(mvm, info, sta, fc) |
370 		iwl_mvm_get_tx_ant(mvm, info, sta, fc);
371 }
372 
373 /*
374  * Sets the fields in the Tx cmd that are rate related
375  */
iwl_mvm_set_tx_cmd_rate(struct iwl_mvm * mvm,struct iwl_tx_cmd * tx_cmd,struct ieee80211_tx_info * info,struct ieee80211_sta * sta,__le16 fc)376 void iwl_mvm_set_tx_cmd_rate(struct iwl_mvm *mvm, struct iwl_tx_cmd *tx_cmd,
377 			    struct ieee80211_tx_info *info,
378 			    struct ieee80211_sta *sta, __le16 fc)
379 {
380 	/* Set retry limit on RTS packets */
381 	tx_cmd->rts_retry_limit = IWL_RTS_DFAULT_RETRY_LIMIT;
382 
383 	/* Set retry limit on DATA packets and Probe Responses*/
384 	if (ieee80211_is_probe_resp(fc)) {
385 		tx_cmd->data_retry_limit = IWL_MGMT_DFAULT_RETRY_LIMIT;
386 		tx_cmd->rts_retry_limit =
387 			min(tx_cmd->data_retry_limit, tx_cmd->rts_retry_limit);
388 	} else if (ieee80211_is_back_req(fc)) {
389 		tx_cmd->data_retry_limit = IWL_BAR_DFAULT_RETRY_LIMIT;
390 	} else {
391 		tx_cmd->data_retry_limit = IWL_DEFAULT_TX_RETRY;
392 	}
393 
394 	/*
395 	 * for data packets, rate info comes from the table inside the fw. This
396 	 * table is controlled by LINK_QUALITY commands
397 	 */
398 
399 	if (ieee80211_is_data(fc) && sta) {
400 		struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
401 
402 		if (mvmsta->sta_state >= IEEE80211_STA_AUTHORIZED) {
403 			tx_cmd->initial_rate_index = 0;
404 			tx_cmd->tx_flags |= cpu_to_le32(TX_CMD_FLG_STA_RATE);
405 			return;
406 		}
407 	} else if (ieee80211_is_back_req(fc)) {
408 		tx_cmd->tx_flags |=
409 			cpu_to_le32(TX_CMD_FLG_ACK | TX_CMD_FLG_BAR);
410 	}
411 
412 	/* Set the rate in the TX cmd */
413 	tx_cmd->rate_n_flags =
414 		cpu_to_le32(iwl_mvm_get_tx_rate_n_flags(mvm, info, sta, fc));
415 }
416 
iwl_mvm_set_tx_cmd_pn(struct ieee80211_tx_info * info,u8 * crypto_hdr)417 static inline void iwl_mvm_set_tx_cmd_pn(struct ieee80211_tx_info *info,
418 					 u8 *crypto_hdr)
419 {
420 	struct ieee80211_key_conf *keyconf = info->control.hw_key;
421 	u64 pn;
422 
423 	pn = atomic64_inc_return(&keyconf->tx_pn);
424 	crypto_hdr[0] = pn;
425 	crypto_hdr[2] = 0;
426 	crypto_hdr[3] = 0x20 | (keyconf->keyidx << 6);
427 	crypto_hdr[1] = pn >> 8;
428 	crypto_hdr[4] = pn >> 16;
429 	crypto_hdr[5] = pn >> 24;
430 	crypto_hdr[6] = pn >> 32;
431 	crypto_hdr[7] = pn >> 40;
432 }
433 
434 /*
435  * Sets the fields in the Tx cmd that are crypto related
436  */
iwl_mvm_set_tx_cmd_crypto(struct iwl_mvm * mvm,struct ieee80211_tx_info * info,struct iwl_tx_cmd * tx_cmd,struct sk_buff * skb_frag,int hdrlen)437 static void iwl_mvm_set_tx_cmd_crypto(struct iwl_mvm *mvm,
438 				      struct ieee80211_tx_info *info,
439 				      struct iwl_tx_cmd *tx_cmd,
440 				      struct sk_buff *skb_frag,
441 				      int hdrlen)
442 {
443 	struct ieee80211_key_conf *keyconf = info->control.hw_key;
444 	u8 *crypto_hdr = skb_frag->data + hdrlen;
445 	enum iwl_tx_cmd_sec_ctrl type = TX_CMD_SEC_CCM;
446 	u64 pn;
447 
448 	switch (keyconf->cipher) {
449 	case WLAN_CIPHER_SUITE_CCMP:
450 		iwl_mvm_set_tx_cmd_ccmp(info, tx_cmd);
451 		iwl_mvm_set_tx_cmd_pn(info, crypto_hdr);
452 		break;
453 
454 	case WLAN_CIPHER_SUITE_TKIP:
455 		tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
456 		pn = atomic64_inc_return(&keyconf->tx_pn);
457 		ieee80211_tkip_add_iv(crypto_hdr, keyconf, pn);
458 		ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
459 		break;
460 
461 	case WLAN_CIPHER_SUITE_WEP104:
462 		tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
463 		fallthrough;
464 	case WLAN_CIPHER_SUITE_WEP40:
465 		tx_cmd->sec_ctl |= TX_CMD_SEC_WEP |
466 			((keyconf->keyidx << TX_CMD_SEC_WEP_KEY_IDX_POS) &
467 			  TX_CMD_SEC_WEP_KEY_IDX_MSK);
468 
469 		memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
470 		break;
471 	case WLAN_CIPHER_SUITE_GCMP:
472 	case WLAN_CIPHER_SUITE_GCMP_256:
473 		type = TX_CMD_SEC_GCMP;
474 		fallthrough;
475 	case WLAN_CIPHER_SUITE_CCMP_256:
476 		/* TODO: Taking the key from the table might introduce a race
477 		 * when PTK rekeying is done, having an old packets with a PN
478 		 * based on the old key but the message encrypted with a new
479 		 * one.
480 		 * Need to handle this.
481 		 */
482 		tx_cmd->sec_ctl |= type | TX_CMD_SEC_KEY_FROM_TABLE;
483 		tx_cmd->key[0] = keyconf->hw_key_idx;
484 		iwl_mvm_set_tx_cmd_pn(info, crypto_hdr);
485 		break;
486 	default:
487 		tx_cmd->sec_ctl |= TX_CMD_SEC_EXT;
488 	}
489 }
490 
491 /*
492  * Allocates and sets the Tx cmd the driver data pointers in the skb
493  */
494 static struct iwl_device_tx_cmd *
iwl_mvm_set_tx_params(struct iwl_mvm * mvm,struct sk_buff * skb,struct ieee80211_tx_info * info,int hdrlen,struct ieee80211_sta * sta,u8 sta_id)495 iwl_mvm_set_tx_params(struct iwl_mvm *mvm, struct sk_buff *skb,
496 		      struct ieee80211_tx_info *info, int hdrlen,
497 		      struct ieee80211_sta *sta, u8 sta_id)
498 {
499 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
500 	struct iwl_device_tx_cmd *dev_cmd;
501 	struct iwl_tx_cmd *tx_cmd;
502 
503 	dev_cmd = iwl_trans_alloc_tx_cmd(mvm->trans);
504 
505 	if (unlikely(!dev_cmd))
506 		return NULL;
507 
508 	dev_cmd->hdr.cmd = TX_CMD;
509 
510 	if (iwl_mvm_has_new_tx_api(mvm)) {
511 		u32 rate_n_flags = 0;
512 		u16 flags = 0;
513 		struct iwl_mvm_sta *mvmsta = sta ?
514 			iwl_mvm_sta_from_mac80211(sta) : NULL;
515 		bool amsdu = false;
516 
517 		if (ieee80211_is_data_qos(hdr->frame_control)) {
518 			u8 *qc = ieee80211_get_qos_ctl(hdr);
519 
520 			amsdu = *qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT;
521 		}
522 
523 		if (!info->control.hw_key)
524 			flags |= IWL_TX_FLAGS_ENCRYPT_DIS;
525 
526 		/*
527 		 * For data packets rate info comes from the fw. Only
528 		 * set rate/antenna during connection establishment or in case
529 		 * no station is given.
530 		 */
531 		if (!sta || !ieee80211_is_data(hdr->frame_control) ||
532 		    mvmsta->sta_state < IEEE80211_STA_AUTHORIZED) {
533 			flags |= IWL_TX_FLAGS_CMD_RATE;
534 			rate_n_flags =
535 				iwl_mvm_get_tx_rate_n_flags(mvm, info, sta,
536 							    hdr->frame_control);
537 		}
538 
539 		if (mvm->trans->trans_cfg->device_family >=
540 		    IWL_DEVICE_FAMILY_AX210) {
541 			struct iwl_tx_cmd_gen3 *cmd = (void *)dev_cmd->payload;
542 			u32 offload_assist = iwl_mvm_tx_csum(mvm, skb,
543 							     info, amsdu);
544 
545 			cmd->offload_assist = cpu_to_le32(offload_assist);
546 
547 			/* Total # bytes to be transmitted */
548 			cmd->len = cpu_to_le16((u16)skb->len);
549 
550 			/* Copy MAC header from skb into command buffer */
551 			memcpy(cmd->hdr, hdr, hdrlen);
552 
553 			cmd->flags = cpu_to_le16(flags);
554 			cmd->rate_n_flags = cpu_to_le32(rate_n_flags);
555 		} else {
556 			struct iwl_tx_cmd_gen2 *cmd = (void *)dev_cmd->payload;
557 			u16 offload_assist = iwl_mvm_tx_csum_pre_bz(mvm, skb,
558 								    info,
559 								    amsdu);
560 
561 			cmd->offload_assist = cpu_to_le16(offload_assist);
562 
563 			/* Total # bytes to be transmitted */
564 			cmd->len = cpu_to_le16((u16)skb->len);
565 
566 			/* Copy MAC header from skb into command buffer */
567 			memcpy(cmd->hdr, hdr, hdrlen);
568 
569 			cmd->flags = cpu_to_le32(flags);
570 			cmd->rate_n_flags = cpu_to_le32(rate_n_flags);
571 		}
572 		goto out;
573 	}
574 
575 	tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
576 
577 	if (info->control.hw_key)
578 		iwl_mvm_set_tx_cmd_crypto(mvm, info, tx_cmd, skb, hdrlen);
579 
580 	iwl_mvm_set_tx_cmd(mvm, skb, tx_cmd, info, sta_id);
581 
582 	iwl_mvm_set_tx_cmd_rate(mvm, tx_cmd, info, sta, hdr->frame_control);
583 
584 	/* Copy MAC header from skb into command buffer */
585 	memcpy(tx_cmd->hdr, hdr, hdrlen);
586 
587 out:
588 	return dev_cmd;
589 }
590 
iwl_mvm_skb_prepare_status(struct sk_buff * skb,struct iwl_device_tx_cmd * cmd)591 static void iwl_mvm_skb_prepare_status(struct sk_buff *skb,
592 				       struct iwl_device_tx_cmd *cmd)
593 {
594 	struct ieee80211_tx_info *skb_info = IEEE80211_SKB_CB(skb);
595 
596 	memset(&skb_info->status, 0, sizeof(skb_info->status));
597 	memset(skb_info->driver_data, 0, sizeof(skb_info->driver_data));
598 
599 	skb_info->driver_data[1] = cmd;
600 }
601 
iwl_mvm_get_ctrl_vif_queue(struct iwl_mvm * mvm,struct ieee80211_tx_info * info,struct ieee80211_hdr * hdr)602 static int iwl_mvm_get_ctrl_vif_queue(struct iwl_mvm *mvm,
603 				      struct ieee80211_tx_info *info,
604 				      struct ieee80211_hdr *hdr)
605 {
606 	struct iwl_mvm_vif *mvmvif =
607 		iwl_mvm_vif_from_mac80211(info->control.vif);
608 	__le16 fc = hdr->frame_control;
609 
610 	switch (info->control.vif->type) {
611 	case NL80211_IFTYPE_AP:
612 	case NL80211_IFTYPE_ADHOC:
613 		/*
614 		 * Non-bufferable frames use the broadcast station, thus they
615 		 * use the probe queue.
616 		 * Also take care of the case where we send a deauth to a
617 		 * station that we don't have, or similarly an association
618 		 * response (with non-success status) for a station we can't
619 		 * accept.
620 		 * Also, disassociate frames might happen, particular with
621 		 * reason 7 ("Class 3 frame received from nonassociated STA").
622 		 */
623 		if (ieee80211_is_mgmt(fc) &&
624 		    (!ieee80211_is_bufferable_mmpdu(fc) ||
625 		     ieee80211_is_deauth(fc) || ieee80211_is_disassoc(fc)))
626 			return mvm->probe_queue;
627 
628 		if (!ieee80211_has_order(fc) && !ieee80211_is_probe_req(fc) &&
629 		    is_multicast_ether_addr(hdr->addr1))
630 			return mvmvif->cab_queue;
631 
632 		WARN_ONCE(info->control.vif->type != NL80211_IFTYPE_ADHOC,
633 			  "fc=0x%02x", le16_to_cpu(fc));
634 		return mvm->probe_queue;
635 	case NL80211_IFTYPE_P2P_DEVICE:
636 		if (ieee80211_is_mgmt(fc))
637 			return mvm->p2p_dev_queue;
638 
639 		WARN_ON_ONCE(1);
640 		return mvm->p2p_dev_queue;
641 	default:
642 		WARN_ONCE(1, "Not a ctrl vif, no available queue\n");
643 		return -1;
644 	}
645 }
646 
iwl_mvm_probe_resp_set_noa(struct iwl_mvm * mvm,struct sk_buff * skb)647 static void iwl_mvm_probe_resp_set_noa(struct iwl_mvm *mvm,
648 				       struct sk_buff *skb)
649 {
650 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
651 	struct iwl_mvm_vif *mvmvif =
652 		iwl_mvm_vif_from_mac80211(info->control.vif);
653 	struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data;
654 	int base_len = (u8 *)mgmt->u.probe_resp.variable - (u8 *)mgmt;
655 	struct iwl_probe_resp_data *resp_data;
656 	const u8 *ie;
657 	u8 *pos;
658 	u8 match[] = {
659 		(WLAN_OUI_WFA >> 16) & 0xff,
660 		(WLAN_OUI_WFA >> 8) & 0xff,
661 		WLAN_OUI_WFA & 0xff,
662 		WLAN_OUI_TYPE_WFA_P2P,
663 	};
664 
665 	rcu_read_lock();
666 
667 	resp_data = rcu_dereference(mvmvif->probe_resp_data);
668 	if (!resp_data)
669 		goto out;
670 
671 	if (!resp_data->notif.noa_active)
672 		goto out;
673 
674 	ie = cfg80211_find_ie_match(WLAN_EID_VENDOR_SPECIFIC,
675 				    mgmt->u.probe_resp.variable,
676 				    skb->len - base_len,
677 				    match, 4, 2);
678 	if (!ie) {
679 		IWL_DEBUG_TX(mvm, "probe resp doesn't have P2P IE\n");
680 		goto out;
681 	}
682 
683 	if (skb_tailroom(skb) < resp_data->noa_len) {
684 		if (pskb_expand_head(skb, 0, resp_data->noa_len, GFP_ATOMIC)) {
685 			IWL_ERR(mvm,
686 				"Failed to reallocate probe resp\n");
687 			goto out;
688 		}
689 	}
690 
691 	pos = skb_put(skb, resp_data->noa_len);
692 
693 	*pos++ = WLAN_EID_VENDOR_SPECIFIC;
694 	/* Set length of IE body (not including ID and length itself) */
695 	*pos++ = resp_data->noa_len - 2;
696 	*pos++ = (WLAN_OUI_WFA >> 16) & 0xff;
697 	*pos++ = (WLAN_OUI_WFA >> 8) & 0xff;
698 	*pos++ = WLAN_OUI_WFA & 0xff;
699 	*pos++ = WLAN_OUI_TYPE_WFA_P2P;
700 
701 	memcpy(pos, &resp_data->notif.noa_attr,
702 	       resp_data->noa_len - sizeof(struct ieee80211_vendor_ie));
703 
704 out:
705 	rcu_read_unlock();
706 }
707 
iwl_mvm_tx_skb_non_sta(struct iwl_mvm * mvm,struct sk_buff * skb)708 int iwl_mvm_tx_skb_non_sta(struct iwl_mvm *mvm, struct sk_buff *skb)
709 {
710 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
711 	struct ieee80211_tx_info info;
712 	struct iwl_device_tx_cmd *dev_cmd;
713 	u8 sta_id;
714 	int hdrlen = ieee80211_hdrlen(hdr->frame_control);
715 	__le16 fc = hdr->frame_control;
716 	bool offchannel = IEEE80211_SKB_CB(skb)->flags &
717 		IEEE80211_TX_CTL_TX_OFFCHAN;
718 	int queue = -1;
719 
720 	if (IWL_MVM_NON_TRANSMITTING_AP && ieee80211_is_probe_resp(fc))
721 		return -1;
722 
723 	memcpy(&info, skb->cb, sizeof(info));
724 
725 	if (WARN_ON_ONCE(skb->len > IEEE80211_MAX_DATA_LEN + hdrlen))
726 		return -1;
727 
728 	if (WARN_ON_ONCE(info.flags & IEEE80211_TX_CTL_AMPDU))
729 		return -1;
730 
731 	if (info.control.vif) {
732 		struct iwl_mvm_vif *mvmvif =
733 			iwl_mvm_vif_from_mac80211(info.control.vif);
734 
735 		if (info.control.vif->type == NL80211_IFTYPE_P2P_DEVICE ||
736 		    info.control.vif->type == NL80211_IFTYPE_AP ||
737 		    info.control.vif->type == NL80211_IFTYPE_ADHOC) {
738 			if (!ieee80211_is_data(hdr->frame_control))
739 				sta_id = mvmvif->bcast_sta.sta_id;
740 			else
741 				sta_id = mvmvif->mcast_sta.sta_id;
742 
743 			queue = iwl_mvm_get_ctrl_vif_queue(mvm, &info, hdr);
744 		} else if (info.control.vif->type == NL80211_IFTYPE_MONITOR) {
745 			queue = mvm->snif_queue;
746 			sta_id = mvm->snif_sta.sta_id;
747 		} else if (info.control.vif->type == NL80211_IFTYPE_STATION &&
748 			   offchannel) {
749 			/*
750 			 * IWL_MVM_OFFCHANNEL_QUEUE is used for ROC packets
751 			 * that can be used in 2 different types of vifs, P2P &
752 			 * STATION.
753 			 * P2P uses the offchannel queue.
754 			 * STATION (HS2.0) uses the auxiliary context of the FW,
755 			 * and hence needs to be sent on the aux queue.
756 			 */
757 			sta_id = mvm->aux_sta.sta_id;
758 			queue = mvm->aux_queue;
759 		}
760 	}
761 
762 	if (queue < 0) {
763 		IWL_ERR(mvm, "No queue was found. Dropping TX\n");
764 		return -1;
765 	}
766 
767 	if (unlikely(ieee80211_is_probe_resp(fc)))
768 		iwl_mvm_probe_resp_set_noa(mvm, skb);
769 
770 	IWL_DEBUG_TX(mvm, "station Id %d, queue=%d\n", sta_id, queue);
771 
772 	dev_cmd = iwl_mvm_set_tx_params(mvm, skb, &info, hdrlen, NULL, sta_id);
773 	if (!dev_cmd)
774 		return -1;
775 
776 	/* From now on, we cannot access info->control */
777 	iwl_mvm_skb_prepare_status(skb, dev_cmd);
778 
779 	if (iwl_trans_tx(mvm->trans, skb, dev_cmd, queue)) {
780 		iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
781 		return -1;
782 	}
783 
784 	return 0;
785 }
786 
iwl_mvm_max_amsdu_size(struct iwl_mvm * mvm,struct ieee80211_sta * sta,unsigned int tid)787 unsigned int iwl_mvm_max_amsdu_size(struct iwl_mvm *mvm,
788 				    struct ieee80211_sta *sta, unsigned int tid)
789 {
790 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
791 	enum nl80211_band band = mvmsta->vif->bss_conf.chandef.chan->band;
792 	u8 ac = tid_to_mac80211_ac[tid];
793 	unsigned int txf;
794 	int lmac = iwl_mvm_get_lmac_id(mvm->fw, band);
795 
796 	/* For HE redirect to trigger based fifos */
797 	if (sta->deflink.he_cap.has_he && !WARN_ON(!iwl_mvm_has_new_tx_api(mvm)))
798 		ac += 4;
799 
800 	txf = iwl_mvm_mac_ac_to_tx_fifo(mvm, ac);
801 
802 	/*
803 	 * Don't send an AMSDU that will be longer than the TXF.
804 	 * Add a security margin of 256 for the TX command + headers.
805 	 * We also want to have the start of the next packet inside the
806 	 * fifo to be able to send bursts.
807 	 */
808 	return min_t(unsigned int, mvmsta->max_amsdu_len,
809 		     mvm->fwrt.smem_cfg.lmac[lmac].txfifo_size[txf] - 256);
810 }
811 
812 #ifdef CONFIG_INET
813 
814 static int
iwl_mvm_tx_tso_segment(struct sk_buff * skb,unsigned int num_subframes,netdev_features_t netdev_flags,struct sk_buff_head * mpdus_skb)815 iwl_mvm_tx_tso_segment(struct sk_buff *skb, unsigned int num_subframes,
816 		       netdev_features_t netdev_flags,
817 		       struct sk_buff_head *mpdus_skb)
818 {
819 	struct sk_buff *tmp, *next;
820 	struct ieee80211_hdr *hdr = (void *)skb->data;
821 	char cb[sizeof(skb->cb)];
822 	u16 i = 0;
823 	unsigned int tcp_payload_len;
824 	unsigned int mss = skb_shinfo(skb)->gso_size;
825 	bool ipv4 = (skb->protocol == htons(ETH_P_IP));
826 	bool qos = ieee80211_is_data_qos(hdr->frame_control);
827 	u16 ip_base_id = ipv4 ? ntohs(ip_hdr(skb)->id) : 0;
828 
829 	skb_shinfo(skb)->gso_size = num_subframes * mss;
830 	memcpy(cb, skb->cb, sizeof(cb));
831 
832 	next = skb_gso_segment(skb, netdev_flags);
833 	skb_shinfo(skb)->gso_size = mss;
834 	skb_shinfo(skb)->gso_type = ipv4 ? SKB_GSO_TCPV4 : SKB_GSO_TCPV6;
835 	if (WARN_ON_ONCE(IS_ERR(next)))
836 		return -EINVAL;
837 	else if (next)
838 		consume_skb(skb);
839 
840 	skb_list_walk_safe(next, tmp, next) {
841 		memcpy(tmp->cb, cb, sizeof(tmp->cb));
842 		/*
843 		 * Compute the length of all the data added for the A-MSDU.
844 		 * This will be used to compute the length to write in the TX
845 		 * command. We have: SNAP + IP + TCP for n -1 subframes and
846 		 * ETH header for n subframes.
847 		 */
848 		tcp_payload_len = skb_tail_pointer(tmp) -
849 			skb_transport_header(tmp) -
850 			tcp_hdrlen(tmp) + tmp->data_len;
851 
852 		if (ipv4)
853 			ip_hdr(tmp)->id = htons(ip_base_id + i * num_subframes);
854 
855 		if (tcp_payload_len > mss) {
856 			skb_shinfo(tmp)->gso_size = mss;
857 			skb_shinfo(tmp)->gso_type = ipv4 ? SKB_GSO_TCPV4 :
858 							   SKB_GSO_TCPV6;
859 		} else {
860 			if (qos) {
861 				u8 *qc;
862 
863 				if (ipv4)
864 					ip_send_check(ip_hdr(tmp));
865 
866 				qc = ieee80211_get_qos_ctl((void *)tmp->data);
867 				*qc &= ~IEEE80211_QOS_CTL_A_MSDU_PRESENT;
868 			}
869 			skb_shinfo(tmp)->gso_size = 0;
870 		}
871 
872 		skb_mark_not_on_list(tmp);
873 		__skb_queue_tail(mpdus_skb, tmp);
874 		i++;
875 	}
876 
877 	return 0;
878 }
879 
iwl_mvm_tx_tso(struct iwl_mvm * mvm,struct sk_buff * skb,struct ieee80211_tx_info * info,struct ieee80211_sta * sta,struct sk_buff_head * mpdus_skb)880 static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb,
881 			  struct ieee80211_tx_info *info,
882 			  struct ieee80211_sta *sta,
883 			  struct sk_buff_head *mpdus_skb)
884 {
885 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
886 	struct ieee80211_hdr *hdr = (void *)skb->data;
887 	unsigned int mss = skb_shinfo(skb)->gso_size;
888 	unsigned int num_subframes, tcp_payload_len, subf_len, max_amsdu_len;
889 	u16 snap_ip_tcp, pad;
890 	netdev_features_t netdev_flags = NETIF_F_CSUM_MASK | NETIF_F_SG;
891 	u8 tid;
892 
893 	snap_ip_tcp = 8 + skb_transport_header(skb) - skb_network_header(skb) +
894 		tcp_hdrlen(skb);
895 
896 	if (!mvmsta->max_amsdu_len ||
897 	    !ieee80211_is_data_qos(hdr->frame_control) ||
898 	    !mvmsta->amsdu_enabled)
899 		return iwl_mvm_tx_tso_segment(skb, 1, netdev_flags, mpdus_skb);
900 
901 	/*
902 	 * Do not build AMSDU for IPv6 with extension headers.
903 	 * ask stack to segment and checkum the generated MPDUs for us.
904 	 */
905 	if (skb->protocol == htons(ETH_P_IPV6) &&
906 	    ((struct ipv6hdr *)skb_network_header(skb))->nexthdr !=
907 	    IPPROTO_TCP) {
908 		netdev_flags &= ~NETIF_F_CSUM_MASK;
909 		return iwl_mvm_tx_tso_segment(skb, 1, netdev_flags, mpdus_skb);
910 	}
911 
912 	tid = ieee80211_get_tid(hdr);
913 	if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
914 		return -EINVAL;
915 
916 	/*
917 	 * No need to lock amsdu_in_ampdu_allowed since it can't be modified
918 	 * during an BA session.
919 	 */
920 	if ((info->flags & IEEE80211_TX_CTL_AMPDU &&
921 	     !mvmsta->tid_data[tid].amsdu_in_ampdu_allowed) ||
922 	    !(mvmsta->amsdu_enabled & BIT(tid)))
923 		return iwl_mvm_tx_tso_segment(skb, 1, netdev_flags, mpdus_skb);
924 
925 	/*
926 	 * Take the min of ieee80211 station and mvm station
927 	 */
928 	max_amsdu_len =
929 		min_t(unsigned int, sta->max_amsdu_len,
930 		      iwl_mvm_max_amsdu_size(mvm, sta, tid));
931 
932 	/*
933 	 * Limit A-MSDU in A-MPDU to 4095 bytes when VHT is not
934 	 * supported. This is a spec requirement (IEEE 802.11-2015
935 	 * section 8.7.3 NOTE 3).
936 	 */
937 	if (info->flags & IEEE80211_TX_CTL_AMPDU &&
938 	    !sta->deflink.vht_cap.vht_supported)
939 		max_amsdu_len = min_t(unsigned int, max_amsdu_len, 4095);
940 
941 	/* Sub frame header + SNAP + IP header + TCP header + MSS */
942 	subf_len = sizeof(struct ethhdr) + snap_ip_tcp + mss;
943 	pad = (4 - subf_len) & 0x3;
944 
945 	/*
946 	 * If we have N subframes in the A-MSDU, then the A-MSDU's size is
947 	 * N * subf_len + (N - 1) * pad.
948 	 */
949 	num_subframes = (max_amsdu_len + pad) / (subf_len + pad);
950 
951 	if (sta->max_amsdu_subframes &&
952 	    num_subframes > sta->max_amsdu_subframes)
953 		num_subframes = sta->max_amsdu_subframes;
954 
955 	tcp_payload_len = skb_tail_pointer(skb) - skb_transport_header(skb) -
956 		tcp_hdrlen(skb) + skb->data_len;
957 
958 	/*
959 	 * Make sure we have enough TBs for the A-MSDU:
960 	 *	2 for each subframe
961 	 *	1 more for each fragment
962 	 *	1 more for the potential data in the header
963 	 */
964 	if ((num_subframes * 2 + skb_shinfo(skb)->nr_frags + 1) >
965 	    mvm->trans->max_skb_frags)
966 		num_subframes = 1;
967 
968 	if (num_subframes > 1)
969 		*ieee80211_get_qos_ctl(hdr) |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
970 
971 	/* This skb fits in one single A-MSDU */
972 	if (num_subframes * mss >= tcp_payload_len) {
973 		__skb_queue_tail(mpdus_skb, skb);
974 		return 0;
975 	}
976 
977 	/*
978 	 * Trick the segmentation function to make it
979 	 * create SKBs that can fit into one A-MSDU.
980 	 */
981 	return iwl_mvm_tx_tso_segment(skb, num_subframes, netdev_flags,
982 				      mpdus_skb);
983 }
984 #else /* CONFIG_INET */
iwl_mvm_tx_tso(struct iwl_mvm * mvm,struct sk_buff * skb,struct ieee80211_tx_info * info,struct ieee80211_sta * sta,struct sk_buff_head * mpdus_skb)985 static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb,
986 			  struct ieee80211_tx_info *info,
987 			  struct ieee80211_sta *sta,
988 			  struct sk_buff_head *mpdus_skb)
989 {
990 	/* Impossible to get TSO with CONFIG_INET */
991 	WARN_ON(1);
992 
993 	return -1;
994 }
995 #endif
996 
997 /* Check if there are any timed-out TIDs on a given shared TXQ */
iwl_mvm_txq_should_update(struct iwl_mvm * mvm,int txq_id)998 static bool iwl_mvm_txq_should_update(struct iwl_mvm *mvm, int txq_id)
999 {
1000 	unsigned long queue_tid_bitmap = mvm->queue_info[txq_id].tid_bitmap;
1001 	unsigned long now = jiffies;
1002 	int tid;
1003 
1004 	if (WARN_ON(iwl_mvm_has_new_tx_api(mvm)))
1005 		return false;
1006 
1007 	for_each_set_bit(tid, &queue_tid_bitmap, IWL_MAX_TID_COUNT + 1) {
1008 		if (time_before(mvm->queue_info[txq_id].last_frame_time[tid] +
1009 				IWL_MVM_DQA_QUEUE_TIMEOUT, now))
1010 			return true;
1011 	}
1012 
1013 	return false;
1014 }
1015 
iwl_mvm_tx_airtime(struct iwl_mvm * mvm,struct iwl_mvm_sta * mvmsta,int airtime)1016 static void iwl_mvm_tx_airtime(struct iwl_mvm *mvm,
1017 			       struct iwl_mvm_sta *mvmsta,
1018 			       int airtime)
1019 {
1020 	int mac = mvmsta->mac_id_n_color & FW_CTXT_ID_MSK;
1021 	struct iwl_mvm_tcm_mac *mdata;
1022 
1023 	if (mac >= NUM_MAC_INDEX_DRIVER)
1024 		return;
1025 
1026 	mdata = &mvm->tcm.data[mac];
1027 
1028 	if (mvm->tcm.paused)
1029 		return;
1030 
1031 	if (time_after(jiffies, mvm->tcm.ts + MVM_TCM_PERIOD))
1032 		schedule_delayed_work(&mvm->tcm.work, 0);
1033 
1034 	mdata->tx.airtime += airtime;
1035 }
1036 
iwl_mvm_tx_pkt_queued(struct iwl_mvm * mvm,struct iwl_mvm_sta * mvmsta,int tid)1037 static int iwl_mvm_tx_pkt_queued(struct iwl_mvm *mvm,
1038 				 struct iwl_mvm_sta *mvmsta, int tid)
1039 {
1040 	u32 ac = tid_to_mac80211_ac[tid];
1041 	int mac = mvmsta->mac_id_n_color & FW_CTXT_ID_MSK;
1042 	struct iwl_mvm_tcm_mac *mdata;
1043 
1044 	if (mac >= NUM_MAC_INDEX_DRIVER)
1045 		return -EINVAL;
1046 
1047 	mdata = &mvm->tcm.data[mac];
1048 
1049 	mdata->tx.pkts[ac]++;
1050 
1051 	return 0;
1052 }
1053 
1054 /*
1055  * Sets the fields in the Tx cmd that are crypto related.
1056  *
1057  * This function must be called with BHs disabled.
1058  */
iwl_mvm_tx_mpdu(struct iwl_mvm * mvm,struct sk_buff * skb,struct ieee80211_tx_info * info,struct ieee80211_sta * sta)1059 static int iwl_mvm_tx_mpdu(struct iwl_mvm *mvm, struct sk_buff *skb,
1060 			   struct ieee80211_tx_info *info,
1061 			   struct ieee80211_sta *sta)
1062 {
1063 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1064 	struct iwl_mvm_sta *mvmsta;
1065 	struct iwl_device_tx_cmd *dev_cmd;
1066 	__le16 fc;
1067 	u16 seq_number = 0;
1068 	u8 tid = IWL_MAX_TID_COUNT;
1069 	u16 txq_id;
1070 	bool is_ampdu = false;
1071 	int hdrlen;
1072 
1073 	mvmsta = iwl_mvm_sta_from_mac80211(sta);
1074 	fc = hdr->frame_control;
1075 	hdrlen = ieee80211_hdrlen(fc);
1076 
1077 	if (IWL_MVM_NON_TRANSMITTING_AP && ieee80211_is_probe_resp(fc))
1078 		return -1;
1079 
1080 	if (WARN_ON_ONCE(!mvmsta))
1081 		return -1;
1082 
1083 	if (WARN_ON_ONCE(mvmsta->sta_id == IWL_MVM_INVALID_STA))
1084 		return -1;
1085 
1086 	if (unlikely(ieee80211_is_any_nullfunc(fc)) && sta->deflink.he_cap.has_he)
1087 		return -1;
1088 
1089 	if (unlikely(ieee80211_is_probe_resp(fc)))
1090 		iwl_mvm_probe_resp_set_noa(mvm, skb);
1091 
1092 	dev_cmd = iwl_mvm_set_tx_params(mvm, skb, info, hdrlen,
1093 					sta, mvmsta->sta_id);
1094 	if (!dev_cmd)
1095 		goto drop;
1096 
1097 	/*
1098 	 * we handle that entirely ourselves -- for uAPSD the firmware
1099 	 * will always send a notification, and for PS-Poll responses
1100 	 * we'll notify mac80211 when getting frame status
1101 	 */
1102 	info->flags &= ~IEEE80211_TX_STATUS_EOSP;
1103 
1104 	spin_lock(&mvmsta->lock);
1105 
1106 	/* nullfunc frames should go to the MGMT queue regardless of QOS,
1107 	 * the condition of !ieee80211_is_qos_nullfunc(fc) keeps the default
1108 	 * assignment of MGMT TID
1109 	 */
1110 	if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc)) {
1111 		tid = ieee80211_get_tid(hdr);
1112 		if (WARN_ONCE(tid >= IWL_MAX_TID_COUNT, "Invalid TID %d", tid))
1113 			goto drop_unlock_sta;
1114 
1115 		is_ampdu = info->flags & IEEE80211_TX_CTL_AMPDU;
1116 		if (WARN_ONCE(is_ampdu &&
1117 			      mvmsta->tid_data[tid].state != IWL_AGG_ON,
1118 			      "Invalid internal agg state %d for TID %d",
1119 			       mvmsta->tid_data[tid].state, tid))
1120 			goto drop_unlock_sta;
1121 
1122 		seq_number = mvmsta->tid_data[tid].seq_number;
1123 		seq_number &= IEEE80211_SCTL_SEQ;
1124 
1125 		if (!iwl_mvm_has_new_tx_api(mvm)) {
1126 			struct iwl_tx_cmd *tx_cmd = (void *)dev_cmd->payload;
1127 
1128 			hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
1129 			hdr->seq_ctrl |= cpu_to_le16(seq_number);
1130 			/* update the tx_cmd hdr as it was already copied */
1131 			tx_cmd->hdr->seq_ctrl = hdr->seq_ctrl;
1132 		}
1133 	} else if (ieee80211_is_data(fc) && !ieee80211_is_data_qos(fc)) {
1134 		tid = IWL_TID_NON_QOS;
1135 	}
1136 
1137 	txq_id = mvmsta->tid_data[tid].txq_id;
1138 
1139 	WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM);
1140 
1141 	if (WARN_ONCE(txq_id == IWL_MVM_INVALID_QUEUE, "Invalid TXQ id")) {
1142 		iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
1143 		spin_unlock(&mvmsta->lock);
1144 		return -1;
1145 	}
1146 
1147 	if (!iwl_mvm_has_new_tx_api(mvm)) {
1148 		/* Keep track of the time of the last frame for this RA/TID */
1149 		mvm->queue_info[txq_id].last_frame_time[tid] = jiffies;
1150 
1151 		/*
1152 		 * If we have timed-out TIDs - schedule the worker that will
1153 		 * reconfig the queues and update them
1154 		 *
1155 		 * Note that the no lock is taken here in order to not serialize
1156 		 * the TX flow. This isn't dangerous because scheduling
1157 		 * mvm->add_stream_wk can't ruin the state, and if we DON'T
1158 		 * schedule it due to some race condition then next TX we get
1159 		 * here we will.
1160 		 */
1161 		if (unlikely(mvm->queue_info[txq_id].status ==
1162 			     IWL_MVM_QUEUE_SHARED &&
1163 			     iwl_mvm_txq_should_update(mvm, txq_id)))
1164 			schedule_work(&mvm->add_stream_wk);
1165 	}
1166 
1167 	IWL_DEBUG_TX(mvm, "TX to [%d|%d] Q:%d - seq: 0x%x len %d\n",
1168 		     mvmsta->sta_id, tid, txq_id,
1169 		     IEEE80211_SEQ_TO_SN(seq_number), skb->len);
1170 
1171 	/* From now on, we cannot access info->control */
1172 	iwl_mvm_skb_prepare_status(skb, dev_cmd);
1173 
1174 	if (ieee80211_is_data(fc))
1175 		iwl_mvm_mei_tx_copy_to_csme(mvm, skb,
1176 					    info->control.hw_key ?
1177 					    info->control.hw_key->iv_len : 0);
1178 
1179 	if (iwl_trans_tx(mvm->trans, skb, dev_cmd, txq_id))
1180 		goto drop_unlock_sta;
1181 
1182 	if (tid < IWL_MAX_TID_COUNT && !ieee80211_has_morefrags(fc))
1183 		mvmsta->tid_data[tid].seq_number = seq_number + 0x10;
1184 
1185 	spin_unlock(&mvmsta->lock);
1186 
1187 	if (iwl_mvm_tx_pkt_queued(mvm, mvmsta,
1188 				  tid == IWL_MAX_TID_COUNT ? 0 : tid))
1189 		goto drop;
1190 
1191 	return 0;
1192 
1193 drop_unlock_sta:
1194 	iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
1195 	spin_unlock(&mvmsta->lock);
1196 drop:
1197 	IWL_DEBUG_TX(mvm, "TX to [%d|%d] dropped\n", mvmsta->sta_id, tid);
1198 	return -1;
1199 }
1200 
iwl_mvm_tx_skb_sta(struct iwl_mvm * mvm,struct sk_buff * skb,struct ieee80211_sta * sta)1201 int iwl_mvm_tx_skb_sta(struct iwl_mvm *mvm, struct sk_buff *skb,
1202 		       struct ieee80211_sta *sta)
1203 {
1204 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1205 	struct ieee80211_tx_info info;
1206 	struct sk_buff_head mpdus_skbs;
1207 	unsigned int payload_len;
1208 	int ret;
1209 
1210 	if (WARN_ON_ONCE(!mvmsta))
1211 		return -1;
1212 
1213 	if (WARN_ON_ONCE(mvmsta->sta_id == IWL_MVM_INVALID_STA))
1214 		return -1;
1215 
1216 	memcpy(&info, skb->cb, sizeof(info));
1217 
1218 	if (!skb_is_gso(skb))
1219 		return iwl_mvm_tx_mpdu(mvm, skb, &info, sta);
1220 
1221 	payload_len = skb_tail_pointer(skb) - skb_transport_header(skb) -
1222 		tcp_hdrlen(skb) + skb->data_len;
1223 
1224 	if (payload_len <= skb_shinfo(skb)->gso_size)
1225 		return iwl_mvm_tx_mpdu(mvm, skb, &info, sta);
1226 
1227 	__skb_queue_head_init(&mpdus_skbs);
1228 
1229 	ret = iwl_mvm_tx_tso(mvm, skb, &info, sta, &mpdus_skbs);
1230 	if (ret)
1231 		return ret;
1232 
1233 	if (WARN_ON(skb_queue_empty(&mpdus_skbs)))
1234 		return ret;
1235 
1236 	while (!skb_queue_empty(&mpdus_skbs)) {
1237 		skb = __skb_dequeue(&mpdus_skbs);
1238 
1239 		ret = iwl_mvm_tx_mpdu(mvm, skb, &info, sta);
1240 		if (ret) {
1241 			__skb_queue_purge(&mpdus_skbs);
1242 			return ret;
1243 		}
1244 	}
1245 
1246 	return 0;
1247 }
1248 
iwl_mvm_check_ratid_empty(struct iwl_mvm * mvm,struct ieee80211_sta * sta,u8 tid)1249 static void iwl_mvm_check_ratid_empty(struct iwl_mvm *mvm,
1250 				      struct ieee80211_sta *sta, u8 tid)
1251 {
1252 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1253 	struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];
1254 	struct ieee80211_vif *vif = mvmsta->vif;
1255 	u16 normalized_ssn;
1256 
1257 	lockdep_assert_held(&mvmsta->lock);
1258 
1259 	if ((tid_data->state == IWL_AGG_ON ||
1260 	     tid_data->state == IWL_EMPTYING_HW_QUEUE_DELBA) &&
1261 	    iwl_mvm_tid_queued(mvm, tid_data) == 0) {
1262 		/*
1263 		 * Now that this aggregation or DQA queue is empty tell
1264 		 * mac80211 so it knows we no longer have frames buffered for
1265 		 * the station on this TID (for the TIM bitmap calculation.)
1266 		 */
1267 		ieee80211_sta_set_buffered(sta, tid, false);
1268 	}
1269 
1270 	/*
1271 	 * In 22000 HW, the next_reclaimed index is only 8 bit, so we'll need
1272 	 * to align the wrap around of ssn so we compare relevant values.
1273 	 */
1274 	normalized_ssn = tid_data->ssn;
1275 	if (mvm->trans->trans_cfg->gen2)
1276 		normalized_ssn &= 0xff;
1277 
1278 	if (normalized_ssn != tid_data->next_reclaimed)
1279 		return;
1280 
1281 	switch (tid_data->state) {
1282 	case IWL_EMPTYING_HW_QUEUE_ADDBA:
1283 		IWL_DEBUG_TX_QUEUES(mvm,
1284 				    "Can continue addBA flow ssn = next_recl = %d\n",
1285 				    tid_data->next_reclaimed);
1286 		tid_data->state = IWL_AGG_STARTING;
1287 		ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
1288 		break;
1289 
1290 	case IWL_EMPTYING_HW_QUEUE_DELBA:
1291 		IWL_DEBUG_TX_QUEUES(mvm,
1292 				    "Can continue DELBA flow ssn = next_recl = %d\n",
1293 				    tid_data->next_reclaimed);
1294 		tid_data->state = IWL_AGG_OFF;
1295 		ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
1296 		break;
1297 
1298 	default:
1299 		break;
1300 	}
1301 }
1302 
1303 #ifdef CONFIG_IWLWIFI_DEBUG
iwl_mvm_get_tx_fail_reason(u32 status)1304 const char *iwl_mvm_get_tx_fail_reason(u32 status)
1305 {
1306 #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
1307 #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
1308 
1309 	switch (status & TX_STATUS_MSK) {
1310 	case TX_STATUS_SUCCESS:
1311 		return "SUCCESS";
1312 	TX_STATUS_POSTPONE(DELAY);
1313 	TX_STATUS_POSTPONE(FEW_BYTES);
1314 	TX_STATUS_POSTPONE(BT_PRIO);
1315 	TX_STATUS_POSTPONE(QUIET_PERIOD);
1316 	TX_STATUS_POSTPONE(CALC_TTAK);
1317 	TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
1318 	TX_STATUS_FAIL(SHORT_LIMIT);
1319 	TX_STATUS_FAIL(LONG_LIMIT);
1320 	TX_STATUS_FAIL(UNDERRUN);
1321 	TX_STATUS_FAIL(DRAIN_FLOW);
1322 	TX_STATUS_FAIL(RFKILL_FLUSH);
1323 	TX_STATUS_FAIL(LIFE_EXPIRE);
1324 	TX_STATUS_FAIL(DEST_PS);
1325 	TX_STATUS_FAIL(HOST_ABORTED);
1326 	TX_STATUS_FAIL(BT_RETRY);
1327 	TX_STATUS_FAIL(STA_INVALID);
1328 	TX_STATUS_FAIL(FRAG_DROPPED);
1329 	TX_STATUS_FAIL(TID_DISABLE);
1330 	TX_STATUS_FAIL(FIFO_FLUSHED);
1331 	TX_STATUS_FAIL(SMALL_CF_POLL);
1332 	TX_STATUS_FAIL(FW_DROP);
1333 	TX_STATUS_FAIL(STA_COLOR_MISMATCH);
1334 	}
1335 
1336 	return "UNKNOWN";
1337 
1338 #undef TX_STATUS_FAIL
1339 #undef TX_STATUS_POSTPONE
1340 }
1341 #endif /* CONFIG_IWLWIFI_DEBUG */
1342 
iwl_mvm_get_hwrate_chan_width(u32 chan_width)1343 static int iwl_mvm_get_hwrate_chan_width(u32 chan_width)
1344 {
1345 	switch (chan_width) {
1346 	case RATE_MCS_CHAN_WIDTH_20:
1347 		return 0;
1348 	case RATE_MCS_CHAN_WIDTH_40:
1349 		return IEEE80211_TX_RC_40_MHZ_WIDTH;
1350 	case RATE_MCS_CHAN_WIDTH_80:
1351 		return IEEE80211_TX_RC_80_MHZ_WIDTH;
1352 	case RATE_MCS_CHAN_WIDTH_160:
1353 		return IEEE80211_TX_RC_160_MHZ_WIDTH;
1354 	default:
1355 		return 0;
1356 	}
1357 }
1358 
iwl_mvm_hwrate_to_tx_rate(u32 rate_n_flags,enum nl80211_band band,struct ieee80211_tx_rate * r)1359 void iwl_mvm_hwrate_to_tx_rate(u32 rate_n_flags,
1360 			       enum nl80211_band band,
1361 			       struct ieee80211_tx_rate *r)
1362 {
1363 	u32 format = rate_n_flags & RATE_MCS_MOD_TYPE_MSK;
1364 	u32 rate = format == RATE_MCS_HT_MSK ?
1365 		RATE_HT_MCS_INDEX(rate_n_flags) :
1366 		rate_n_flags & RATE_MCS_CODE_MSK;
1367 
1368 	r->flags |=
1369 		iwl_mvm_get_hwrate_chan_width(rate_n_flags &
1370 					      RATE_MCS_CHAN_WIDTH_MSK);
1371 
1372 	if (rate_n_flags & RATE_MCS_SGI_MSK)
1373 		r->flags |= IEEE80211_TX_RC_SHORT_GI;
1374 	if (format ==  RATE_MCS_HT_MSK) {
1375 		r->flags |= IEEE80211_TX_RC_MCS;
1376 		r->idx = rate;
1377 	} else if (format ==  RATE_MCS_VHT_MSK) {
1378 		ieee80211_rate_set_vht(r, rate,
1379 				       ((rate_n_flags & RATE_MCS_NSS_MSK) >>
1380 					RATE_MCS_NSS_POS) + 1);
1381 		r->flags |= IEEE80211_TX_RC_VHT_MCS;
1382 	} else if (format == RATE_MCS_HE_MSK) {
1383 		/* mac80211 cannot do this without ieee80211_tx_status_ext()
1384 		 * but it only matters for radiotap */
1385 		r->idx = 0;
1386 	} else {
1387 		r->idx = iwl_mvm_legacy_hw_idx_to_mac80211_idx(rate_n_flags,
1388 							       band);
1389 	}
1390 }
1391 
iwl_mvm_hwrate_to_tx_rate_v1(u32 rate_n_flags,enum nl80211_band band,struct ieee80211_tx_rate * r)1392 void iwl_mvm_hwrate_to_tx_rate_v1(u32 rate_n_flags,
1393 				  enum nl80211_band band,
1394 				  struct ieee80211_tx_rate *r)
1395 {
1396 	if (rate_n_flags & RATE_HT_MCS_GF_MSK)
1397 		r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
1398 
1399 	r->flags |=
1400 		iwl_mvm_get_hwrate_chan_width(rate_n_flags &
1401 					      RATE_MCS_CHAN_WIDTH_MSK_V1);
1402 
1403 	if (rate_n_flags & RATE_MCS_SGI_MSK_V1)
1404 		r->flags |= IEEE80211_TX_RC_SHORT_GI;
1405 	if (rate_n_flags & RATE_MCS_HT_MSK_V1) {
1406 		r->flags |= IEEE80211_TX_RC_MCS;
1407 		r->idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK_V1;
1408 	} else if (rate_n_flags & RATE_MCS_VHT_MSK_V1) {
1409 		ieee80211_rate_set_vht(
1410 			r, rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK,
1411 			((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
1412 						RATE_VHT_MCS_NSS_POS) + 1);
1413 		r->flags |= IEEE80211_TX_RC_VHT_MCS;
1414 	} else {
1415 		r->idx = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
1416 							     band);
1417 	}
1418 }
1419 
1420 /*
1421  * translate ucode response to mac80211 tx status control values
1422  */
iwl_mvm_hwrate_to_tx_status(const struct iwl_fw * fw,u32 rate_n_flags,struct ieee80211_tx_info * info)1423 static void iwl_mvm_hwrate_to_tx_status(const struct iwl_fw *fw,
1424 					u32 rate_n_flags,
1425 					struct ieee80211_tx_info *info)
1426 {
1427 	struct ieee80211_tx_rate *r = &info->status.rates[0];
1428 
1429 	if (iwl_fw_lookup_notif_ver(fw, LONG_GROUP,
1430 				    TX_CMD, 0) <= 6)
1431 		rate_n_flags = iwl_new_rate_from_v1(rate_n_flags);
1432 
1433 	info->status.antenna =
1434 		((rate_n_flags & RATE_MCS_ANT_AB_MSK) >> RATE_MCS_ANT_POS);
1435 	iwl_mvm_hwrate_to_tx_rate(rate_n_flags,
1436 				  info->band, r);
1437 }
1438 
iwl_mvm_tx_status_check_trigger(struct iwl_mvm * mvm,u32 status,__le16 frame_control)1439 static void iwl_mvm_tx_status_check_trigger(struct iwl_mvm *mvm,
1440 					    u32 status, __le16 frame_control)
1441 {
1442 	struct iwl_fw_dbg_trigger_tlv *trig;
1443 	struct iwl_fw_dbg_trigger_tx_status *status_trig;
1444 	int i;
1445 
1446 	if ((status & TX_STATUS_MSK) != TX_STATUS_SUCCESS) {
1447 		enum iwl_fw_ini_time_point tp =
1448 			IWL_FW_INI_TIME_POINT_TX_FAILED;
1449 
1450 		if (ieee80211_is_action(frame_control))
1451 			tp = IWL_FW_INI_TIME_POINT_TX_WFD_ACTION_FRAME_FAILED;
1452 
1453 		iwl_dbg_tlv_time_point(&mvm->fwrt,
1454 				       tp, NULL);
1455 		return;
1456 	}
1457 
1458 	trig = iwl_fw_dbg_trigger_on(&mvm->fwrt, NULL,
1459 				     FW_DBG_TRIGGER_TX_STATUS);
1460 	if (!trig)
1461 		return;
1462 
1463 	status_trig = (void *)trig->data;
1464 
1465 	for (i = 0; i < ARRAY_SIZE(status_trig->statuses); i++) {
1466 		/* don't collect on status 0 */
1467 		if (!status_trig->statuses[i].status)
1468 			break;
1469 
1470 		if (status_trig->statuses[i].status != (status & TX_STATUS_MSK))
1471 			continue;
1472 
1473 		iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
1474 					"Tx status %d was received",
1475 					status & TX_STATUS_MSK);
1476 		break;
1477 	}
1478 }
1479 
1480 /*
1481  * iwl_mvm_get_scd_ssn - returns the SSN of the SCD
1482  * @tx_resp: the Tx response from the fw (agg or non-agg)
1483  *
1484  * When the fw sends an AMPDU, it fetches the MPDUs one after the other. Since
1485  * it can't know that everything will go well until the end of the AMPDU, it
1486  * can't know in advance the number of MPDUs that will be sent in the current
1487  * batch. This is why it writes the agg Tx response while it fetches the MPDUs.
1488  * Hence, it can't know in advance what the SSN of the SCD will be at the end
1489  * of the batch. This is why the SSN of the SCD is written at the end of the
1490  * whole struct at a variable offset. This function knows how to cope with the
1491  * variable offset and returns the SSN of the SCD.
1492  */
iwl_mvm_get_scd_ssn(struct iwl_mvm * mvm,struct iwl_mvm_tx_resp * tx_resp)1493 static inline u32 iwl_mvm_get_scd_ssn(struct iwl_mvm *mvm,
1494 				      struct iwl_mvm_tx_resp *tx_resp)
1495 {
1496 	return le32_to_cpup((__le32 *)iwl_mvm_get_agg_status(mvm, tx_resp) +
1497 			    tx_resp->frame_count) & 0xfff;
1498 }
1499 
iwl_mvm_rx_tx_cmd_single(struct iwl_mvm * mvm,struct iwl_rx_packet * pkt)1500 static void iwl_mvm_rx_tx_cmd_single(struct iwl_mvm *mvm,
1501 				     struct iwl_rx_packet *pkt)
1502 {
1503 	struct ieee80211_sta *sta;
1504 	u16 sequence = le16_to_cpu(pkt->hdr.sequence);
1505 	int txq_id = SEQ_TO_QUEUE(sequence);
1506 	/* struct iwl_mvm_tx_resp_v3 is almost the same */
1507 	struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
1508 	int sta_id = IWL_MVM_TX_RES_GET_RA(tx_resp->ra_tid);
1509 	int tid = IWL_MVM_TX_RES_GET_TID(tx_resp->ra_tid);
1510 	struct agg_tx_status *agg_status =
1511 		iwl_mvm_get_agg_status(mvm, tx_resp);
1512 	u32 status = le16_to_cpu(agg_status->status);
1513 	u16 ssn = iwl_mvm_get_scd_ssn(mvm, tx_resp);
1514 	struct sk_buff_head skbs;
1515 	u8 skb_freed = 0;
1516 	u8 lq_color;
1517 	u16 next_reclaimed, seq_ctl;
1518 	bool is_ndp = false;
1519 
1520 	__skb_queue_head_init(&skbs);
1521 
1522 	if (iwl_mvm_has_new_tx_api(mvm))
1523 		txq_id = le16_to_cpu(tx_resp->tx_queue);
1524 
1525 	seq_ctl = le16_to_cpu(tx_resp->seq_ctl);
1526 
1527 	/* we can free until ssn % q.n_bd not inclusive */
1528 	iwl_trans_reclaim(mvm->trans, txq_id, ssn, &skbs);
1529 
1530 	while (!skb_queue_empty(&skbs)) {
1531 		struct sk_buff *skb = __skb_dequeue(&skbs);
1532 		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1533 		struct ieee80211_hdr *hdr = (void *)skb->data;
1534 		bool flushed = false;
1535 
1536 		skb_freed++;
1537 
1538 		iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]);
1539 
1540 		memset(&info->status, 0, sizeof(info->status));
1541 
1542 		/* inform mac80211 about what happened with the frame */
1543 		switch (status & TX_STATUS_MSK) {
1544 		case TX_STATUS_SUCCESS:
1545 		case TX_STATUS_DIRECT_DONE:
1546 			info->flags |= IEEE80211_TX_STAT_ACK;
1547 			break;
1548 		case TX_STATUS_FAIL_FIFO_FLUSHED:
1549 		case TX_STATUS_FAIL_DRAIN_FLOW:
1550 			flushed = true;
1551 			break;
1552 		case TX_STATUS_FAIL_DEST_PS:
1553 			/* the FW should have stopped the queue and not
1554 			 * return this status
1555 			 */
1556 			IWL_ERR_LIMIT(mvm,
1557 				      "FW reported TX filtered, status=0x%x, FC=0x%x\n",
1558 				      status, le16_to_cpu(hdr->frame_control));
1559 			info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
1560 			break;
1561 		default:
1562 			break;
1563 		}
1564 
1565 		if ((status & TX_STATUS_MSK) != TX_STATUS_SUCCESS &&
1566 		    ieee80211_is_mgmt(hdr->frame_control))
1567 			iwl_mvm_toggle_tx_ant(mvm, &mvm->mgmt_last_antenna_idx);
1568 
1569 		/*
1570 		 * If we are freeing multiple frames, mark all the frames
1571 		 * but the first one as acked, since they were acknowledged
1572 		 * before
1573 		 * */
1574 		if (skb_freed > 1)
1575 			info->flags |= IEEE80211_TX_STAT_ACK;
1576 
1577 		iwl_mvm_tx_status_check_trigger(mvm, status, hdr->frame_control);
1578 
1579 		info->status.rates[0].count = tx_resp->failure_frame + 1;
1580 
1581 		iwl_mvm_hwrate_to_tx_status(mvm->fw,
1582 					    le32_to_cpu(tx_resp->initial_rate),
1583 					    info);
1584 
1585 		/* Don't assign the converted initial_rate, because driver
1586 		 * TLC uses this and doesn't support the new FW rate
1587 		 */
1588 		info->status.status_driver_data[1] =
1589 			(void *)(uintptr_t)le32_to_cpu(tx_resp->initial_rate);
1590 
1591 		/* Single frame failure in an AMPDU queue => send BAR */
1592 		if (info->flags & IEEE80211_TX_CTL_AMPDU &&
1593 		    !(info->flags & IEEE80211_TX_STAT_ACK) &&
1594 		    !(info->flags & IEEE80211_TX_STAT_TX_FILTERED) && !flushed)
1595 			info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
1596 		info->flags &= ~IEEE80211_TX_CTL_AMPDU;
1597 
1598 		/* W/A FW bug: seq_ctl is wrong upon failure / BAR frame */
1599 		if (ieee80211_is_back_req(hdr->frame_control))
1600 			seq_ctl = 0;
1601 		else if (status != TX_STATUS_SUCCESS)
1602 			seq_ctl = le16_to_cpu(hdr->seq_ctrl);
1603 
1604 		if (unlikely(!seq_ctl)) {
1605 			/*
1606 			 * If it is an NDP, we can't update next_reclaim since
1607 			 * its sequence control is 0. Note that for that same
1608 			 * reason, NDPs are never sent to A-MPDU'able queues
1609 			 * so that we can never have more than one freed frame
1610 			 * for a single Tx resonse (see WARN_ON below).
1611 			 */
1612 			if (ieee80211_is_qos_nullfunc(hdr->frame_control))
1613 				is_ndp = true;
1614 		}
1615 
1616 		/*
1617 		 * TODO: this is not accurate if we are freeing more than one
1618 		 * packet.
1619 		 */
1620 		info->status.tx_time =
1621 			le16_to_cpu(tx_resp->wireless_media_time);
1622 		BUILD_BUG_ON(ARRAY_SIZE(info->status.status_driver_data) < 1);
1623 		lq_color = TX_RES_RATE_TABLE_COL_GET(tx_resp->tlc_info);
1624 		info->status.status_driver_data[0] =
1625 			RS_DRV_DATA_PACK(lq_color, tx_resp->reduced_tpc);
1626 
1627 		ieee80211_tx_status(mvm->hw, skb);
1628 	}
1629 
1630 	/* This is an aggregation queue or might become one, so we use
1631 	 * the ssn since: ssn = wifi seq_num % 256.
1632 	 * The seq_ctl is the sequence control of the packet to which
1633 	 * this Tx response relates. But if there is a hole in the
1634 	 * bitmap of the BA we received, this Tx response may allow to
1635 	 * reclaim the hole and all the subsequent packets that were
1636 	 * already acked. In that case, seq_ctl != ssn, and the next
1637 	 * packet to be reclaimed will be ssn and not seq_ctl. In that
1638 	 * case, several packets will be reclaimed even if
1639 	 * frame_count = 1.
1640 	 *
1641 	 * The ssn is the index (% 256) of the latest packet that has
1642 	 * treated (acked / dropped) + 1.
1643 	 */
1644 	next_reclaimed = ssn;
1645 
1646 	IWL_DEBUG_TX_REPLY(mvm,
1647 			   "TXQ %d status %s (0x%08x)\n",
1648 			   txq_id, iwl_mvm_get_tx_fail_reason(status), status);
1649 
1650 	IWL_DEBUG_TX_REPLY(mvm,
1651 			   "\t\t\t\tinitial_rate 0x%x retries %d, idx=%d ssn=%d next_reclaimed=0x%x seq_ctl=0x%x\n",
1652 			   le32_to_cpu(tx_resp->initial_rate),
1653 			   tx_resp->failure_frame, SEQ_TO_INDEX(sequence),
1654 			   ssn, next_reclaimed, seq_ctl);
1655 
1656 	rcu_read_lock();
1657 
1658 	sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
1659 	/*
1660 	 * sta can't be NULL otherwise it'd mean that the sta has been freed in
1661 	 * the firmware while we still have packets for it in the Tx queues.
1662 	 */
1663 	if (WARN_ON_ONCE(!sta))
1664 		goto out;
1665 
1666 	if (!IS_ERR(sta)) {
1667 		struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1668 
1669 		iwl_mvm_tx_airtime(mvm, mvmsta,
1670 				   le16_to_cpu(tx_resp->wireless_media_time));
1671 
1672 		if ((status & TX_STATUS_MSK) != TX_STATUS_SUCCESS &&
1673 		    mvmsta->sta_state < IEEE80211_STA_AUTHORIZED)
1674 			iwl_mvm_toggle_tx_ant(mvm, &mvmsta->tx_ant);
1675 
1676 		if (sta->wme && tid != IWL_MGMT_TID) {
1677 			struct iwl_mvm_tid_data *tid_data =
1678 				&mvmsta->tid_data[tid];
1679 			bool send_eosp_ndp = false;
1680 
1681 			spin_lock_bh(&mvmsta->lock);
1682 
1683 			if (!is_ndp) {
1684 				tid_data->next_reclaimed = next_reclaimed;
1685 				IWL_DEBUG_TX_REPLY(mvm,
1686 						   "Next reclaimed packet:%d\n",
1687 						   next_reclaimed);
1688 			} else {
1689 				IWL_DEBUG_TX_REPLY(mvm,
1690 						   "NDP - don't update next_reclaimed\n");
1691 			}
1692 
1693 			iwl_mvm_check_ratid_empty(mvm, sta, tid);
1694 
1695 			if (mvmsta->sleep_tx_count) {
1696 				mvmsta->sleep_tx_count--;
1697 				if (mvmsta->sleep_tx_count &&
1698 				    !iwl_mvm_tid_queued(mvm, tid_data)) {
1699 					/*
1700 					 * The number of frames in the queue
1701 					 * dropped to 0 even if we sent less
1702 					 * frames than we thought we had on the
1703 					 * Tx queue.
1704 					 * This means we had holes in the BA
1705 					 * window that we just filled, ask
1706 					 * mac80211 to send EOSP since the
1707 					 * firmware won't know how to do that.
1708 					 * Send NDP and the firmware will send
1709 					 * EOSP notification that will trigger
1710 					 * a call to ieee80211_sta_eosp().
1711 					 */
1712 					send_eosp_ndp = true;
1713 				}
1714 			}
1715 
1716 			spin_unlock_bh(&mvmsta->lock);
1717 			if (send_eosp_ndp) {
1718 				iwl_mvm_sta_modify_sleep_tx_count(mvm, sta,
1719 					IEEE80211_FRAME_RELEASE_UAPSD,
1720 					1, tid, false, false);
1721 				mvmsta->sleep_tx_count = 0;
1722 				ieee80211_send_eosp_nullfunc(sta, tid);
1723 			}
1724 		}
1725 
1726 		if (mvmsta->next_status_eosp) {
1727 			mvmsta->next_status_eosp = false;
1728 			ieee80211_sta_eosp(sta);
1729 		}
1730 	}
1731 out:
1732 	rcu_read_unlock();
1733 }
1734 
1735 #ifdef CONFIG_IWLWIFI_DEBUG
1736 #define AGG_TX_STATE_(x) case AGG_TX_STATE_ ## x: return #x
iwl_get_agg_tx_status(u16 status)1737 static const char *iwl_get_agg_tx_status(u16 status)
1738 {
1739 	switch (status & AGG_TX_STATE_STATUS_MSK) {
1740 	AGG_TX_STATE_(TRANSMITTED);
1741 	AGG_TX_STATE_(UNDERRUN);
1742 	AGG_TX_STATE_(BT_PRIO);
1743 	AGG_TX_STATE_(FEW_BYTES);
1744 	AGG_TX_STATE_(ABORT);
1745 	AGG_TX_STATE_(TX_ON_AIR_DROP);
1746 	AGG_TX_STATE_(LAST_SENT_TRY_CNT);
1747 	AGG_TX_STATE_(LAST_SENT_BT_KILL);
1748 	AGG_TX_STATE_(SCD_QUERY);
1749 	AGG_TX_STATE_(TEST_BAD_CRC32);
1750 	AGG_TX_STATE_(RESPONSE);
1751 	AGG_TX_STATE_(DUMP_TX);
1752 	AGG_TX_STATE_(DELAY_TX);
1753 	}
1754 
1755 	return "UNKNOWN";
1756 }
1757 
iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm * mvm,struct iwl_rx_packet * pkt)1758 static void iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm *mvm,
1759 				      struct iwl_rx_packet *pkt)
1760 {
1761 	struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
1762 	struct agg_tx_status *frame_status =
1763 		iwl_mvm_get_agg_status(mvm, tx_resp);
1764 	int i;
1765 	bool tirgger_timepoint = false;
1766 
1767 	for (i = 0; i < tx_resp->frame_count; i++) {
1768 		u16 fstatus = le16_to_cpu(frame_status[i].status);
1769 		/* In case one frame wasn't transmitted trigger time point */
1770 		tirgger_timepoint |= ((fstatus & AGG_TX_STATE_STATUS_MSK) !=
1771 				      AGG_TX_STATE_TRANSMITTED);
1772 		IWL_DEBUG_TX_REPLY(mvm,
1773 				   "status %s (0x%04x), try-count (%d) seq (0x%x)\n",
1774 				   iwl_get_agg_tx_status(fstatus),
1775 				   fstatus & AGG_TX_STATE_STATUS_MSK,
1776 				   (fstatus & AGG_TX_STATE_TRY_CNT_MSK) >>
1777 					AGG_TX_STATE_TRY_CNT_POS,
1778 				   le16_to_cpu(frame_status[i].sequence));
1779 	}
1780 
1781 	if (tirgger_timepoint)
1782 		iwl_dbg_tlv_time_point(&mvm->fwrt,
1783 				       IWL_FW_INI_TIME_POINT_TX_FAILED, NULL);
1784 
1785 }
1786 #else
iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm * mvm,struct iwl_rx_packet * pkt)1787 static void iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm *mvm,
1788 				      struct iwl_rx_packet *pkt)
1789 {}
1790 #endif /* CONFIG_IWLWIFI_DEBUG */
1791 
iwl_mvm_rx_tx_cmd_agg(struct iwl_mvm * mvm,struct iwl_rx_packet * pkt)1792 static void iwl_mvm_rx_tx_cmd_agg(struct iwl_mvm *mvm,
1793 				  struct iwl_rx_packet *pkt)
1794 {
1795 	struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
1796 	int sta_id = IWL_MVM_TX_RES_GET_RA(tx_resp->ra_tid);
1797 	int tid = IWL_MVM_TX_RES_GET_TID(tx_resp->ra_tid);
1798 	u16 sequence = le16_to_cpu(pkt->hdr.sequence);
1799 	struct iwl_mvm_sta *mvmsta;
1800 	int queue = SEQ_TO_QUEUE(sequence);
1801 	struct ieee80211_sta *sta;
1802 
1803 	if (WARN_ON_ONCE(queue < IWL_MVM_DQA_MIN_DATA_QUEUE &&
1804 			 (queue != IWL_MVM_DQA_BSS_CLIENT_QUEUE)))
1805 		return;
1806 
1807 	iwl_mvm_rx_tx_cmd_agg_dbg(mvm, pkt);
1808 
1809 	rcu_read_lock();
1810 
1811 	mvmsta = iwl_mvm_sta_from_staid_rcu(mvm, sta_id);
1812 
1813 	sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
1814 	if (WARN_ON_ONCE(!sta || !sta->wme)) {
1815 		rcu_read_unlock();
1816 		return;
1817 	}
1818 
1819 	if (!WARN_ON_ONCE(!mvmsta)) {
1820 		mvmsta->tid_data[tid].rate_n_flags =
1821 			le32_to_cpu(tx_resp->initial_rate);
1822 		mvmsta->tid_data[tid].tx_time =
1823 			le16_to_cpu(tx_resp->wireless_media_time);
1824 		mvmsta->tid_data[tid].lq_color =
1825 			TX_RES_RATE_TABLE_COL_GET(tx_resp->tlc_info);
1826 		iwl_mvm_tx_airtime(mvm, mvmsta,
1827 				   le16_to_cpu(tx_resp->wireless_media_time));
1828 	}
1829 
1830 	rcu_read_unlock();
1831 }
1832 
iwl_mvm_rx_tx_cmd(struct iwl_mvm * mvm,struct iwl_rx_cmd_buffer * rxb)1833 void iwl_mvm_rx_tx_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
1834 {
1835 	struct iwl_rx_packet *pkt = rxb_addr(rxb);
1836 	struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
1837 
1838 	if (tx_resp->frame_count == 1)
1839 		iwl_mvm_rx_tx_cmd_single(mvm, pkt);
1840 	else
1841 		iwl_mvm_rx_tx_cmd_agg(mvm, pkt);
1842 }
1843 
iwl_mvm_tx_reclaim(struct iwl_mvm * mvm,int sta_id,int tid,int txq,int index,struct ieee80211_tx_info * tx_info,u32 rate,bool is_flush)1844 static void iwl_mvm_tx_reclaim(struct iwl_mvm *mvm, int sta_id, int tid,
1845 			       int txq, int index,
1846 			       struct ieee80211_tx_info *tx_info, u32 rate,
1847 			       bool is_flush)
1848 {
1849 	struct sk_buff_head reclaimed_skbs;
1850 	struct iwl_mvm_tid_data *tid_data = NULL;
1851 	struct ieee80211_sta *sta;
1852 	struct iwl_mvm_sta *mvmsta = NULL;
1853 	struct sk_buff *skb;
1854 	int freed;
1855 
1856 	if (WARN_ONCE(sta_id >= mvm->fw->ucode_capa.num_stations ||
1857 		      tid > IWL_MAX_TID_COUNT,
1858 		      "sta_id %d tid %d", sta_id, tid))
1859 		return;
1860 
1861 	rcu_read_lock();
1862 
1863 	sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
1864 
1865 	/* Reclaiming frames for a station that has been deleted ? */
1866 	if (WARN_ON_ONCE(!sta)) {
1867 		rcu_read_unlock();
1868 		return;
1869 	}
1870 
1871 	__skb_queue_head_init(&reclaimed_skbs);
1872 
1873 	/*
1874 	 * Release all TFDs before the SSN, i.e. all TFDs in front of
1875 	 * block-ack window (we assume that they've been successfully
1876 	 * transmitted ... if not, it's too late anyway).
1877 	 */
1878 	iwl_trans_reclaim(mvm->trans, txq, index, &reclaimed_skbs);
1879 
1880 	skb_queue_walk(&reclaimed_skbs, skb) {
1881 		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1882 
1883 		iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]);
1884 
1885 		memset(&info->status, 0, sizeof(info->status));
1886 		/* Packet was transmitted successfully, failures come as single
1887 		 * frames because before failing a frame the firmware transmits
1888 		 * it without aggregation at least once.
1889 		 */
1890 		if (!is_flush)
1891 			info->flags |= IEEE80211_TX_STAT_ACK;
1892 	}
1893 
1894 	/*
1895 	 * It's possible to get a BA response after invalidating the rcu (rcu is
1896 	 * invalidated in order to prevent new Tx from being sent, but there may
1897 	 * be some frames already in-flight).
1898 	 * In this case we just want to reclaim, and could skip all the
1899 	 * sta-dependent stuff since it's in the middle of being removed
1900 	 * anyways.
1901 	 */
1902 	if (IS_ERR(sta))
1903 		goto out;
1904 
1905 	mvmsta = iwl_mvm_sta_from_mac80211(sta);
1906 	tid_data = &mvmsta->tid_data[tid];
1907 
1908 	if (tid_data->txq_id != txq) {
1909 		IWL_ERR(mvm,
1910 			"invalid reclaim request: Q %d, tid %d\n",
1911 			tid_data->txq_id, tid);
1912 		rcu_read_unlock();
1913 		return;
1914 	}
1915 
1916 	spin_lock_bh(&mvmsta->lock);
1917 
1918 	tid_data->next_reclaimed = index;
1919 
1920 	iwl_mvm_check_ratid_empty(mvm, sta, tid);
1921 
1922 	freed = 0;
1923 
1924 	/* pack lq color from tid_data along the reduced txp */
1925 	tx_info->status.status_driver_data[0] =
1926 		RS_DRV_DATA_PACK(tid_data->lq_color,
1927 				 tx_info->status.status_driver_data[0]);
1928 	tx_info->status.status_driver_data[1] = (void *)(uintptr_t)rate;
1929 
1930 	skb_queue_walk(&reclaimed_skbs, skb) {
1931 		struct ieee80211_hdr *hdr = (void *)skb->data;
1932 		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1933 
1934 		if (!is_flush) {
1935 			if (ieee80211_is_data_qos(hdr->frame_control))
1936 				freed++;
1937 			else
1938 				WARN_ON_ONCE(tid != IWL_MAX_TID_COUNT);
1939 		}
1940 
1941 		/* this is the first skb we deliver in this batch */
1942 		/* put the rate scaling data there */
1943 		if (freed == 1) {
1944 			info->flags |= IEEE80211_TX_STAT_AMPDU;
1945 			memcpy(&info->status, &tx_info->status,
1946 			       sizeof(tx_info->status));
1947 			iwl_mvm_hwrate_to_tx_status(mvm->fw, rate, info);
1948 		}
1949 	}
1950 
1951 	spin_unlock_bh(&mvmsta->lock);
1952 
1953 	/* We got a BA notif with 0 acked or scd_ssn didn't progress which is
1954 	 * possible (i.e. first MPDU in the aggregation wasn't acked)
1955 	 * Still it's important to update RS about sent vs. acked.
1956 	 */
1957 	if (!is_flush && skb_queue_empty(&reclaimed_skbs)) {
1958 		struct ieee80211_chanctx_conf *chanctx_conf = NULL;
1959 
1960 		if (mvmsta->vif)
1961 			chanctx_conf =
1962 				rcu_dereference(mvmsta->vif->bss_conf.chanctx_conf);
1963 
1964 		if (WARN_ON_ONCE(!chanctx_conf))
1965 			goto out;
1966 
1967 		tx_info->band = chanctx_conf->def.chan->band;
1968 		iwl_mvm_hwrate_to_tx_status(mvm->fw, rate, tx_info);
1969 
1970 		if (!iwl_mvm_has_tlc_offload(mvm)) {
1971 			IWL_DEBUG_TX_REPLY(mvm,
1972 					   "No reclaim. Update rs directly\n");
1973 			iwl_mvm_rs_tx_status(mvm, sta, tid, tx_info, false);
1974 		}
1975 	}
1976 
1977 out:
1978 	rcu_read_unlock();
1979 
1980 	while (!skb_queue_empty(&reclaimed_skbs)) {
1981 		skb = __skb_dequeue(&reclaimed_skbs);
1982 		ieee80211_tx_status(mvm->hw, skb);
1983 	}
1984 }
1985 
iwl_mvm_rx_ba_notif(struct iwl_mvm * mvm,struct iwl_rx_cmd_buffer * rxb)1986 void iwl_mvm_rx_ba_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
1987 {
1988 	struct iwl_rx_packet *pkt = rxb_addr(rxb);
1989 	unsigned int pkt_len = iwl_rx_packet_payload_len(pkt);
1990 	int sta_id, tid, txq, index;
1991 	struct ieee80211_tx_info ba_info = {};
1992 	struct iwl_mvm_ba_notif *ba_notif;
1993 	struct iwl_mvm_tid_data *tid_data;
1994 	struct iwl_mvm_sta *mvmsta;
1995 
1996 	ba_info.flags = IEEE80211_TX_STAT_AMPDU;
1997 
1998 	if (iwl_mvm_has_new_tx_api(mvm)) {
1999 		struct iwl_mvm_compressed_ba_notif *ba_res =
2000 			(void *)pkt->data;
2001 		u8 lq_color = TX_RES_RATE_TABLE_COL_GET(ba_res->tlc_rate_info);
2002 		u16 tfd_cnt;
2003 		int i;
2004 
2005 		if (unlikely(sizeof(*ba_res) > pkt_len))
2006 			return;
2007 
2008 		sta_id = ba_res->sta_id;
2009 		ba_info.status.ampdu_ack_len = (u8)le16_to_cpu(ba_res->done);
2010 		ba_info.status.ampdu_len = (u8)le16_to_cpu(ba_res->txed);
2011 		ba_info.status.tx_time =
2012 			(u16)le32_to_cpu(ba_res->wireless_time);
2013 		ba_info.status.status_driver_data[0] =
2014 			(void *)(uintptr_t)ba_res->reduced_txp;
2015 
2016 		tfd_cnt = le16_to_cpu(ba_res->tfd_cnt);
2017 		if (!tfd_cnt || struct_size(ba_res, tfd, tfd_cnt) > pkt_len)
2018 			return;
2019 
2020 		rcu_read_lock();
2021 
2022 		mvmsta = iwl_mvm_sta_from_staid_rcu(mvm, sta_id);
2023 		/*
2024 		 * It's possible to get a BA response after invalidating the rcu
2025 		 * (rcu is invalidated in order to prevent new Tx from being
2026 		 * sent, but there may be some frames already in-flight).
2027 		 * In this case we just want to reclaim, and could skip all the
2028 		 * sta-dependent stuff since it's in the middle of being removed
2029 		 * anyways.
2030 		 */
2031 
2032 		/* Free per TID */
2033 		for (i = 0; i < tfd_cnt; i++) {
2034 			struct iwl_mvm_compressed_ba_tfd *ba_tfd =
2035 				&ba_res->tfd[i];
2036 
2037 			tid = ba_tfd->tid;
2038 			if (tid == IWL_MGMT_TID)
2039 				tid = IWL_MAX_TID_COUNT;
2040 
2041 			if (mvmsta)
2042 				mvmsta->tid_data[i].lq_color = lq_color;
2043 
2044 			iwl_mvm_tx_reclaim(mvm, sta_id, tid,
2045 					   (int)(le16_to_cpu(ba_tfd->q_num)),
2046 					   le16_to_cpu(ba_tfd->tfd_index),
2047 					   &ba_info,
2048 					   le32_to_cpu(ba_res->tx_rate), false);
2049 		}
2050 
2051 		if (mvmsta)
2052 			iwl_mvm_tx_airtime(mvm, mvmsta,
2053 					   le32_to_cpu(ba_res->wireless_time));
2054 		rcu_read_unlock();
2055 
2056 		IWL_DEBUG_TX_REPLY(mvm,
2057 				   "BA_NOTIFICATION Received from sta_id = %d, flags %x, sent:%d, acked:%d\n",
2058 				   sta_id, le32_to_cpu(ba_res->flags),
2059 				   le16_to_cpu(ba_res->txed),
2060 				   le16_to_cpu(ba_res->done));
2061 		return;
2062 	}
2063 
2064 	ba_notif = (void *)pkt->data;
2065 	sta_id = ba_notif->sta_id;
2066 	tid = ba_notif->tid;
2067 	/* "flow" corresponds to Tx queue */
2068 	txq = le16_to_cpu(ba_notif->scd_flow);
2069 	/* "ssn" is start of block-ack Tx window, corresponds to index
2070 	 * (in Tx queue's circular buffer) of first TFD/frame in window */
2071 	index = le16_to_cpu(ba_notif->scd_ssn);
2072 
2073 	rcu_read_lock();
2074 	mvmsta = iwl_mvm_sta_from_staid_rcu(mvm, sta_id);
2075 	if (WARN_ON_ONCE(!mvmsta)) {
2076 		rcu_read_unlock();
2077 		return;
2078 	}
2079 
2080 	tid_data = &mvmsta->tid_data[tid];
2081 
2082 	ba_info.status.ampdu_ack_len = ba_notif->txed_2_done;
2083 	ba_info.status.ampdu_len = ba_notif->txed;
2084 	ba_info.status.tx_time = tid_data->tx_time;
2085 	ba_info.status.status_driver_data[0] =
2086 		(void *)(uintptr_t)ba_notif->reduced_txp;
2087 
2088 	rcu_read_unlock();
2089 
2090 	iwl_mvm_tx_reclaim(mvm, sta_id, tid, txq, index, &ba_info,
2091 			   tid_data->rate_n_flags, false);
2092 
2093 	IWL_DEBUG_TX_REPLY(mvm,
2094 			   "BA_NOTIFICATION Received from %pM, sta_id = %d\n",
2095 			   ba_notif->sta_addr, ba_notif->sta_id);
2096 
2097 	IWL_DEBUG_TX_REPLY(mvm,
2098 			   "TID = %d, SeqCtl = %d, bitmap = 0x%llx, scd_flow = %d, scd_ssn = %d sent:%d, acked:%d\n",
2099 			   ba_notif->tid, le16_to_cpu(ba_notif->seq_ctl),
2100 			   le64_to_cpu(ba_notif->bitmap), txq, index,
2101 			   ba_notif->txed, ba_notif->txed_2_done);
2102 
2103 	IWL_DEBUG_TX_REPLY(mvm, "reduced txp from ba notif %d\n",
2104 			   ba_notif->reduced_txp);
2105 }
2106 
2107 /*
2108  * Note that there are transports that buffer frames before they reach
2109  * the firmware. This means that after flush_tx_path is called, the
2110  * queue might not be empty. The race-free way to handle this is to:
2111  * 1) set the station as draining
2112  * 2) flush the Tx path
2113  * 3) wait for the transport queues to be empty
2114  */
iwl_mvm_flush_tx_path(struct iwl_mvm * mvm,u32 tfd_msk)2115 int iwl_mvm_flush_tx_path(struct iwl_mvm *mvm, u32 tfd_msk)
2116 {
2117 	int ret;
2118 	struct iwl_tx_path_flush_cmd_v1 flush_cmd = {
2119 		.queues_ctl = cpu_to_le32(tfd_msk),
2120 		.flush_ctl = cpu_to_le16(DUMP_TX_FIFO_FLUSH),
2121 	};
2122 
2123 	WARN_ON(iwl_mvm_has_new_tx_api(mvm));
2124 	ret = iwl_mvm_send_cmd_pdu(mvm, TXPATH_FLUSH, 0,
2125 				   sizeof(flush_cmd), &flush_cmd);
2126 	if (ret)
2127 		IWL_ERR(mvm, "Failed to send flush command (%d)\n", ret);
2128 	return ret;
2129 }
2130 
iwl_mvm_flush_sta_tids(struct iwl_mvm * mvm,u32 sta_id,u16 tids)2131 int iwl_mvm_flush_sta_tids(struct iwl_mvm *mvm, u32 sta_id, u16 tids)
2132 {
2133 	int ret;
2134 	struct iwl_tx_path_flush_cmd_rsp *rsp;
2135 	struct iwl_tx_path_flush_cmd flush_cmd = {
2136 		.sta_id = cpu_to_le32(sta_id),
2137 		.tid_mask = cpu_to_le16(tids),
2138 	};
2139 
2140 	struct iwl_host_cmd cmd = {
2141 		.id = TXPATH_FLUSH,
2142 		.len = { sizeof(flush_cmd), },
2143 		.data = { &flush_cmd, },
2144 	};
2145 
2146 	WARN_ON(!iwl_mvm_has_new_tx_api(mvm));
2147 
2148 	if (iwl_fw_lookup_notif_ver(mvm->fw, LONG_GROUP, TXPATH_FLUSH, 0) > 0)
2149 		cmd.flags |= CMD_WANT_SKB;
2150 
2151 	IWL_DEBUG_TX_QUEUES(mvm, "flush for sta id %d tid mask 0x%x\n",
2152 			    sta_id, tids);
2153 
2154 	ret = iwl_mvm_send_cmd(mvm, &cmd);
2155 
2156 	if (ret) {
2157 		IWL_ERR(mvm, "Failed to send flush command (%d)\n", ret);
2158 		return ret;
2159 	}
2160 
2161 	if (cmd.flags & CMD_WANT_SKB) {
2162 		int i;
2163 		int num_flushed_queues;
2164 
2165 		if (WARN_ON_ONCE(iwl_rx_packet_payload_len(cmd.resp_pkt) != sizeof(*rsp))) {
2166 			ret = -EIO;
2167 			goto free_rsp;
2168 		}
2169 
2170 		rsp = (void *)cmd.resp_pkt->data;
2171 
2172 		if (WARN_ONCE(le16_to_cpu(rsp->sta_id) != sta_id,
2173 			      "sta_id %d != rsp_sta_id %d",
2174 			      sta_id, le16_to_cpu(rsp->sta_id))) {
2175 			ret = -EIO;
2176 			goto free_rsp;
2177 		}
2178 
2179 		num_flushed_queues = le16_to_cpu(rsp->num_flushed_queues);
2180 		if (WARN_ONCE(num_flushed_queues > IWL_TX_FLUSH_QUEUE_RSP,
2181 			      "num_flushed_queues %d", num_flushed_queues)) {
2182 			ret = -EIO;
2183 			goto free_rsp;
2184 		}
2185 
2186 		for (i = 0; i < num_flushed_queues; i++) {
2187 			struct ieee80211_tx_info tx_info = {};
2188 			struct iwl_flush_queue_info *queue_info = &rsp->queues[i];
2189 			int tid = le16_to_cpu(queue_info->tid);
2190 			int read_before = le16_to_cpu(queue_info->read_before_flush);
2191 			int read_after = le16_to_cpu(queue_info->read_after_flush);
2192 			int queue_num = le16_to_cpu(queue_info->queue_num);
2193 
2194 			if (tid == IWL_MGMT_TID)
2195 				tid = IWL_MAX_TID_COUNT;
2196 
2197 			IWL_DEBUG_TX_QUEUES(mvm,
2198 					    "tid %d queue_id %d read-before %d read-after %d\n",
2199 					    tid, queue_num, read_before, read_after);
2200 
2201 			iwl_mvm_tx_reclaim(mvm, sta_id, tid, queue_num, read_after,
2202 					   &tx_info, 0, true);
2203 		}
2204 free_rsp:
2205 		iwl_free_resp(&cmd);
2206 	}
2207 	return ret;
2208 }
2209 
iwl_mvm_flush_sta(struct iwl_mvm * mvm,void * sta,bool internal)2210 int iwl_mvm_flush_sta(struct iwl_mvm *mvm, void *sta, bool internal)
2211 {
2212 	struct iwl_mvm_int_sta *int_sta = sta;
2213 	struct iwl_mvm_sta *mvm_sta = sta;
2214 
2215 	BUILD_BUG_ON(offsetof(struct iwl_mvm_int_sta, sta_id) !=
2216 		     offsetof(struct iwl_mvm_sta, sta_id));
2217 
2218 	if (iwl_mvm_has_new_tx_api(mvm))
2219 		return iwl_mvm_flush_sta_tids(mvm, mvm_sta->sta_id, 0xffff);
2220 
2221 	if (internal)
2222 		return iwl_mvm_flush_tx_path(mvm, int_sta->tfd_queue_msk);
2223 
2224 	return iwl_mvm_flush_tx_path(mvm, mvm_sta->tfd_queue_msk);
2225 }
2226