1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2 /*
3  * Copyright (C) 2012-2014, 2018-2022 Intel Corporation
4  * Copyright (C) 2013-2014 Intel Mobile Communications GmbH
5  * Copyright (C) 2017 Intel Deutschland GmbH
6  */
7 #include <net/mac80211.h>
8 #include "fw-api.h"
9 #include "mvm.h"
10 
11 /* Maps the driver specific channel width definition to the fw values */
12 u8 iwl_mvm_get_channel_width(struct cfg80211_chan_def *chandef)
13 {
14 	switch (chandef->width) {
15 	case NL80211_CHAN_WIDTH_20_NOHT:
16 	case NL80211_CHAN_WIDTH_20:
17 		return IWL_PHY_CHANNEL_MODE20;
18 	case NL80211_CHAN_WIDTH_40:
19 		return IWL_PHY_CHANNEL_MODE40;
20 	case NL80211_CHAN_WIDTH_80:
21 		return IWL_PHY_CHANNEL_MODE80;
22 	case NL80211_CHAN_WIDTH_160:
23 		return IWL_PHY_CHANNEL_MODE160;
24 	case NL80211_CHAN_WIDTH_320:
25 		return IWL_PHY_CHANNEL_MODE320;
26 	default:
27 		WARN(1, "Invalid channel width=%u", chandef->width);
28 		return IWL_PHY_CHANNEL_MODE20;
29 	}
30 }
31 
32 /*
33  * Maps the driver specific control channel position (relative to the center
34  * freq) definitions to the the fw values
35  */
36 u8 iwl_mvm_get_ctrl_pos(struct cfg80211_chan_def *chandef)
37 {
38 	int offs = chandef->chan->center_freq - chandef->center_freq1;
39 	int abs_offs = abs(offs);
40 	u8 ret;
41 
42 	if (offs == 0) {
43 		/*
44 		 * The FW is expected to check the control channel position only
45 		 * when in HT/VHT and the channel width is not 20MHz. Return
46 		 * this value as the default one.
47 		 */
48 		return 0;
49 	}
50 
51 	/* this results in a value 0-7, i.e. fitting into 0b0111 */
52 	ret = (abs_offs - 10) / 20;
53 	/*
54 	 * But we need the value to be in 0b1011 because 0b0100 is
55 	 * IWL_PHY_CTRL_POS_ABOVE, so shift bit 2 up to land in
56 	 * IWL_PHY_CTRL_POS_OFFS_EXT (0b1000)
57 	 */
58 	ret = (ret & IWL_PHY_CTRL_POS_OFFS_MSK) |
59 	      ((ret & BIT(2)) << 1);
60 	/* and add the above bit */
61 	ret |= (offs > 0) * IWL_PHY_CTRL_POS_ABOVE;
62 
63 	return ret;
64 }
65 
66 /*
67  * Construct the generic fields of the PHY context command
68  */
69 static void iwl_mvm_phy_ctxt_cmd_hdr(struct iwl_mvm_phy_ctxt *ctxt,
70 				     struct iwl_phy_context_cmd *cmd,
71 				     u32 action)
72 {
73 	cmd->id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(ctxt->id,
74 							    ctxt->color));
75 	cmd->action = cpu_to_le32(action);
76 }
77 
78 static void iwl_mvm_phy_ctxt_set_rxchain(struct iwl_mvm *mvm,
79 					 struct iwl_mvm_phy_ctxt *ctxt,
80 					 __le32 *rxchain_info,
81 					 u8 chains_static,
82 					 u8 chains_dynamic)
83 {
84 	u8 active_cnt, idle_cnt;
85 
86 	/* Set rx the chains */
87 	idle_cnt = chains_static;
88 	active_cnt = chains_dynamic;
89 
90 	/* In scenarios where we only ever use a single-stream rates,
91 	 * i.e. legacy 11b/g/a associations, single-stream APs or even
92 	 * static SMPS, enable both chains to get diversity, improving
93 	 * the case where we're far enough from the AP that attenuation
94 	 * between the two antennas is sufficiently different to impact
95 	 * performance.
96 	 */
97 	if (active_cnt == 1 && iwl_mvm_rx_diversity_allowed(mvm, ctxt)) {
98 		idle_cnt = 2;
99 		active_cnt = 2;
100 	}
101 
102 	/*
103 	 * If the firmware requested it, then we know that it supports
104 	 * getting zero for the values to indicate "use one, but pick
105 	 * which one yourself", which means it can dynamically pick one
106 	 * that e.g. has better RSSI.
107 	 */
108 	if (mvm->fw_static_smps_request && active_cnt == 1 && idle_cnt == 1) {
109 		idle_cnt = 0;
110 		active_cnt = 0;
111 	}
112 
113 	*rxchain_info = cpu_to_le32(iwl_mvm_get_valid_rx_ant(mvm) <<
114 					PHY_RX_CHAIN_VALID_POS);
115 	*rxchain_info |= cpu_to_le32(idle_cnt << PHY_RX_CHAIN_CNT_POS);
116 	*rxchain_info |= cpu_to_le32(active_cnt <<
117 					 PHY_RX_CHAIN_MIMO_CNT_POS);
118 #ifdef CONFIG_IWLWIFI_DEBUGFS
119 	if (unlikely(mvm->dbgfs_rx_phyinfo))
120 		*rxchain_info = cpu_to_le32(mvm->dbgfs_rx_phyinfo);
121 #endif
122 }
123 
124 /*
125  * Add the phy configuration to the PHY context command
126  */
127 static void iwl_mvm_phy_ctxt_cmd_data_v1(struct iwl_mvm *mvm,
128 					 struct iwl_mvm_phy_ctxt *ctxt,
129 					 struct iwl_phy_context_cmd_v1 *cmd,
130 					 struct cfg80211_chan_def *chandef,
131 					 u8 chains_static, u8 chains_dynamic)
132 {
133 	struct iwl_phy_context_cmd_tail *tail =
134 		iwl_mvm_chan_info_cmd_tail(mvm, &cmd->ci);
135 
136 	/* Set the channel info data */
137 	iwl_mvm_set_chan_info_chandef(mvm, &cmd->ci, chandef);
138 
139 	iwl_mvm_phy_ctxt_set_rxchain(mvm, ctxt, &tail->rxchain_info,
140 				     chains_static, chains_dynamic);
141 
142 	tail->txchain_info = cpu_to_le32(iwl_mvm_get_valid_tx_ant(mvm));
143 }
144 
145 /*
146  * Add the phy configuration to the PHY context command
147  */
148 static void iwl_mvm_phy_ctxt_cmd_data(struct iwl_mvm *mvm,
149 				      struct iwl_mvm_phy_ctxt *ctxt,
150 				      struct iwl_phy_context_cmd *cmd,
151 				      struct cfg80211_chan_def *chandef,
152 				      u8 chains_static, u8 chains_dynamic)
153 {
154 	cmd->lmac_id = cpu_to_le32(iwl_mvm_get_lmac_id(mvm->fw,
155 						       chandef->chan->band));
156 
157 	/* Set the channel info data */
158 	iwl_mvm_set_chan_info_chandef(mvm, &cmd->ci, chandef);
159 
160 	/* we only support RLC command version 2 */
161 	if (iwl_fw_lookup_cmd_ver(mvm->fw, WIDE_ID(DATA_PATH_GROUP, RLC_CONFIG_CMD), 0) < 2)
162 		iwl_mvm_phy_ctxt_set_rxchain(mvm, ctxt, &cmd->rxchain_info,
163 					     chains_static, chains_dynamic);
164 }
165 
166 static int iwl_mvm_phy_send_rlc(struct iwl_mvm *mvm,
167 				struct iwl_mvm_phy_ctxt *ctxt,
168 				u8 chains_static, u8 chains_dynamic)
169 {
170 	struct iwl_rlc_config_cmd cmd = {
171 		.phy_id = cpu_to_le32(ctxt->id),
172 	};
173 
174 	if (iwl_fw_lookup_cmd_ver(mvm->fw, WIDE_ID(DATA_PATH_GROUP, RLC_CONFIG_CMD), 0) < 2)
175 		return 0;
176 
177 	BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_DRIVER_FORCE !=
178 		     PHY_RX_CHAIN_DRIVER_FORCE_MSK);
179 	BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_VALID !=
180 		     PHY_RX_CHAIN_VALID_MSK);
181 	BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_FORCE !=
182 		     PHY_RX_CHAIN_FORCE_SEL_MSK);
183 	BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_FORCE_MIMO !=
184 		     PHY_RX_CHAIN_FORCE_MIMO_SEL_MSK);
185 	BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_COUNT != PHY_RX_CHAIN_CNT_MSK);
186 	BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_MIMO_COUNT !=
187 		     PHY_RX_CHAIN_MIMO_CNT_MSK);
188 
189 	iwl_mvm_phy_ctxt_set_rxchain(mvm, ctxt, &cmd.rlc.rx_chain_info,
190 				     chains_static, chains_dynamic);
191 
192 	return iwl_mvm_send_cmd_pdu(mvm, iwl_cmd_id(RLC_CONFIG_CMD,
193 						    DATA_PATH_GROUP, 2),
194 				    0, sizeof(cmd), &cmd);
195 }
196 
197 /*
198  * Send a command to apply the current phy configuration. The command is send
199  * only if something in the configuration changed: in case that this is the
200  * first time that the phy configuration is applied or in case that the phy
201  * configuration changed from the previous apply.
202  */
203 static int iwl_mvm_phy_ctxt_apply(struct iwl_mvm *mvm,
204 				  struct iwl_mvm_phy_ctxt *ctxt,
205 				  struct cfg80211_chan_def *chandef,
206 				  u8 chains_static, u8 chains_dynamic,
207 				  u32 action)
208 {
209 	int ret;
210 	int ver = iwl_fw_lookup_cmd_ver(mvm->fw, PHY_CONTEXT_CMD, 1);
211 
212 	if (ver == 3 || ver == 4) {
213 		struct iwl_phy_context_cmd cmd = {};
214 
215 		/* Set the command header fields */
216 		iwl_mvm_phy_ctxt_cmd_hdr(ctxt, &cmd, action);
217 
218 		/* Set the command data */
219 		iwl_mvm_phy_ctxt_cmd_data(mvm, ctxt, &cmd, chandef,
220 					  chains_static,
221 					  chains_dynamic);
222 
223 		ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD,
224 					   0, sizeof(cmd), &cmd);
225 	} else if (ver < 3) {
226 		struct iwl_phy_context_cmd_v1 cmd = {};
227 		u16 len = sizeof(cmd) - iwl_mvm_chan_info_padding(mvm);
228 
229 		/* Set the command header fields */
230 		iwl_mvm_phy_ctxt_cmd_hdr(ctxt,
231 					 (struct iwl_phy_context_cmd *)&cmd,
232 					 action);
233 
234 		/* Set the command data */
235 		iwl_mvm_phy_ctxt_cmd_data_v1(mvm, ctxt, &cmd, chandef,
236 					     chains_static,
237 					     chains_dynamic);
238 		ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD,
239 					   0, len, &cmd);
240 	} else {
241 		IWL_ERR(mvm, "PHY ctxt cmd error ver %d not supported\n", ver);
242 		return -EOPNOTSUPP;
243 	}
244 
245 
246 	if (ret) {
247 		IWL_ERR(mvm, "PHY ctxt cmd error. ret=%d\n", ret);
248 		return ret;
249 	}
250 
251 	if (action != FW_CTXT_ACTION_REMOVE)
252 		return iwl_mvm_phy_send_rlc(mvm, ctxt, chains_static,
253 					    chains_dynamic);
254 
255 	return 0;
256 }
257 
258 /*
259  * Send a command to add a PHY context based on the current HW configuration.
260  */
261 int iwl_mvm_phy_ctxt_add(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
262 			 struct cfg80211_chan_def *chandef,
263 			 u8 chains_static, u8 chains_dynamic)
264 {
265 	WARN_ON(!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) &&
266 		ctxt->ref);
267 	lockdep_assert_held(&mvm->mutex);
268 
269 	ctxt->channel = chandef->chan;
270 	ctxt->width = chandef->width;
271 	ctxt->center_freq1 = chandef->center_freq1;
272 
273 	return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
274 				      chains_static, chains_dynamic,
275 				      FW_CTXT_ACTION_ADD);
276 }
277 
278 /*
279  * Update the number of references to the given PHY context. This is valid only
280  * in case the PHY context was already created, i.e., its reference count > 0.
281  */
282 void iwl_mvm_phy_ctxt_ref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
283 {
284 	lockdep_assert_held(&mvm->mutex);
285 	ctxt->ref++;
286 }
287 
288 /*
289  * Send a command to modify the PHY context based on the current HW
290  * configuration. Note that the function does not check that the configuration
291  * changed.
292  */
293 int iwl_mvm_phy_ctxt_changed(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
294 			     struct cfg80211_chan_def *chandef,
295 			     u8 chains_static, u8 chains_dynamic)
296 {
297 	enum iwl_ctxt_action action = FW_CTXT_ACTION_MODIFY;
298 
299 	lockdep_assert_held(&mvm->mutex);
300 
301 	if (iwl_fw_lookup_cmd_ver(mvm->fw, WIDE_ID(DATA_PATH_GROUP, RLC_CONFIG_CMD), 0) >= 2 &&
302 	    ctxt->channel == chandef->chan &&
303 	    ctxt->width == chandef->width &&
304 	    ctxt->center_freq1 == chandef->center_freq1)
305 		return iwl_mvm_phy_send_rlc(mvm, ctxt, chains_static,
306 					    chains_dynamic);
307 
308 	if (fw_has_capa(&mvm->fw->ucode_capa,
309 			IWL_UCODE_TLV_CAPA_BINDING_CDB_SUPPORT) &&
310 	    ctxt->channel->band != chandef->chan->band) {
311 		int ret;
312 
313 		/* ... remove it here ...*/
314 		ret = iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
315 					     chains_static, chains_dynamic,
316 					     FW_CTXT_ACTION_REMOVE);
317 		if (ret)
318 			return ret;
319 
320 		/* ... and proceed to add it again */
321 		action = FW_CTXT_ACTION_ADD;
322 	}
323 
324 	ctxt->channel = chandef->chan;
325 	ctxt->width = chandef->width;
326 	ctxt->center_freq1 = chandef->center_freq1;
327 
328 	return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
329 				      chains_static, chains_dynamic,
330 				      action);
331 }
332 
333 void iwl_mvm_phy_ctxt_unref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
334 {
335 	lockdep_assert_held(&mvm->mutex);
336 
337 	if (WARN_ON_ONCE(!ctxt))
338 		return;
339 
340 	ctxt->ref--;
341 
342 	/*
343 	 * Move unused phy's to a default channel. When the phy is moved the,
344 	 * fw will cleanup immediate quiet bit if it was previously set,
345 	 * otherwise we might not be able to reuse this phy.
346 	 */
347 	if (ctxt->ref == 0) {
348 		struct ieee80211_channel *chan = NULL;
349 		struct cfg80211_chan_def chandef;
350 		struct ieee80211_supported_band *sband;
351 		enum nl80211_band band;
352 		int channel;
353 
354 		for (band = NL80211_BAND_2GHZ; band < NUM_NL80211_BANDS; band++) {
355 			sband = mvm->hw->wiphy->bands[band];
356 
357 			if (!sband)
358 				continue;
359 
360 			for (channel = 0; channel < sband->n_channels; channel++)
361 				if (!(sband->channels[channel].flags &
362 						IEEE80211_CHAN_DISABLED)) {
363 					chan = &sband->channels[channel];
364 					break;
365 				}
366 
367 			if (chan)
368 				break;
369 		}
370 
371 		if (WARN_ON(!chan))
372 			return;
373 
374 		cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_NO_HT);
375 		iwl_mvm_phy_ctxt_changed(mvm, ctxt, &chandef, 1, 1);
376 	}
377 }
378 
379 static void iwl_mvm_binding_iterator(void *_data, u8 *mac,
380 				     struct ieee80211_vif *vif)
381 {
382 	unsigned long *data = _data;
383 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
384 
385 	if (!mvmvif->deflink.phy_ctxt)
386 		return;
387 
388 	if (vif->type == NL80211_IFTYPE_STATION ||
389 	    vif->type == NL80211_IFTYPE_AP)
390 		__set_bit(mvmvif->deflink.phy_ctxt->id, data);
391 }
392 
393 int iwl_mvm_phy_ctx_count(struct iwl_mvm *mvm)
394 {
395 	unsigned long phy_ctxt_counter = 0;
396 
397 	ieee80211_iterate_active_interfaces_atomic(mvm->hw,
398 						   IEEE80211_IFACE_ITER_NORMAL,
399 						   iwl_mvm_binding_iterator,
400 						   &phy_ctxt_counter);
401 
402 	return hweight8(phy_ctxt_counter);
403 }
404