1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2 /*
3  * Copyright (C) 2012-2014, 2018-2023 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 */
iwl_mvm_get_channel_width(struct cfg80211_chan_def * chandef)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  */
iwl_mvm_get_ctrl_pos(struct cfg80211_chan_def * chandef)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  */
iwl_mvm_phy_ctxt_cmd_hdr(struct iwl_mvm_phy_ctxt * ctxt,struct iwl_phy_context_cmd * cmd,u32 action)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 
iwl_mvm_phy_ctxt_set_rxchain(struct iwl_mvm * mvm,struct iwl_mvm_phy_ctxt * ctxt,__le32 * rxchain_info,u8 chains_static,u8 chains_dynamic)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 	*rxchain_info = cpu_to_le32(iwl_mvm_get_valid_rx_ant(mvm) <<
103 					PHY_RX_CHAIN_VALID_POS);
104 	*rxchain_info |= cpu_to_le32(idle_cnt << PHY_RX_CHAIN_CNT_POS);
105 	*rxchain_info |= cpu_to_le32(active_cnt <<
106 					 PHY_RX_CHAIN_MIMO_CNT_POS);
107 #ifdef CONFIG_IWLWIFI_DEBUGFS
108 	if (unlikely(mvm->dbgfs_rx_phyinfo))
109 		*rxchain_info = cpu_to_le32(mvm->dbgfs_rx_phyinfo);
110 #endif
111 }
112 
113 /*
114  * Add the phy configuration to the PHY context command
115  */
iwl_mvm_phy_ctxt_cmd_data_v1(struct iwl_mvm * mvm,struct iwl_mvm_phy_ctxt * ctxt,struct iwl_phy_context_cmd_v1 * cmd,struct cfg80211_chan_def * chandef,u8 chains_static,u8 chains_dynamic)116 static void iwl_mvm_phy_ctxt_cmd_data_v1(struct iwl_mvm *mvm,
117 					 struct iwl_mvm_phy_ctxt *ctxt,
118 					 struct iwl_phy_context_cmd_v1 *cmd,
119 					 struct cfg80211_chan_def *chandef,
120 					 u8 chains_static, u8 chains_dynamic)
121 {
122 	struct iwl_phy_context_cmd_tail *tail =
123 		iwl_mvm_chan_info_cmd_tail(mvm, &cmd->ci);
124 
125 	/* Set the channel info data */
126 	iwl_mvm_set_chan_info_chandef(mvm, &cmd->ci, chandef);
127 
128 	iwl_mvm_phy_ctxt_set_rxchain(mvm, ctxt, &tail->rxchain_info,
129 				     chains_static, chains_dynamic);
130 
131 	tail->txchain_info = cpu_to_le32(iwl_mvm_get_valid_tx_ant(mvm));
132 }
133 
134 /*
135  * Add the phy configuration to the PHY context command
136  */
iwl_mvm_phy_ctxt_cmd_data(struct iwl_mvm * mvm,struct iwl_mvm_phy_ctxt * ctxt,struct iwl_phy_context_cmd * cmd,struct cfg80211_chan_def * chandef,u8 chains_static,u8 chains_dynamic)137 static void iwl_mvm_phy_ctxt_cmd_data(struct iwl_mvm *mvm,
138 				      struct iwl_mvm_phy_ctxt *ctxt,
139 				      struct iwl_phy_context_cmd *cmd,
140 				      struct cfg80211_chan_def *chandef,
141 				      u8 chains_static, u8 chains_dynamic)
142 {
143 	cmd->lmac_id = cpu_to_le32(iwl_mvm_get_lmac_id(mvm,
144 						       chandef->chan->band));
145 
146 	/* Set the channel info data */
147 	iwl_mvm_set_chan_info_chandef(mvm, &cmd->ci, chandef);
148 
149 	/* we only support RLC command version 2 */
150 	if (iwl_fw_lookup_cmd_ver(mvm->fw, WIDE_ID(DATA_PATH_GROUP, RLC_CONFIG_CMD), 0) < 2)
151 		iwl_mvm_phy_ctxt_set_rxchain(mvm, ctxt, &cmd->rxchain_info,
152 					     chains_static, chains_dynamic);
153 }
154 
iwl_mvm_phy_send_rlc(struct iwl_mvm * mvm,struct iwl_mvm_phy_ctxt * ctxt,u8 chains_static,u8 chains_dynamic)155 int iwl_mvm_phy_send_rlc(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
156 			 u8 chains_static, u8 chains_dynamic)
157 {
158 	struct iwl_rlc_config_cmd cmd = {
159 		.phy_id = cpu_to_le32(ctxt->id),
160 	};
161 
162 	if (ctxt->rlc_disabled)
163 		return 0;
164 
165 	if (iwl_fw_lookup_cmd_ver(mvm->fw, WIDE_ID(DATA_PATH_GROUP,
166 						   RLC_CONFIG_CMD), 0) < 2)
167 		return 0;
168 
169 	BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_DRIVER_FORCE !=
170 		     PHY_RX_CHAIN_DRIVER_FORCE_MSK);
171 	BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_VALID !=
172 		     PHY_RX_CHAIN_VALID_MSK);
173 	BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_FORCE !=
174 		     PHY_RX_CHAIN_FORCE_SEL_MSK);
175 	BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_FORCE_MIMO !=
176 		     PHY_RX_CHAIN_FORCE_MIMO_SEL_MSK);
177 	BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_COUNT != PHY_RX_CHAIN_CNT_MSK);
178 	BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_MIMO_COUNT !=
179 		     PHY_RX_CHAIN_MIMO_CNT_MSK);
180 
181 	iwl_mvm_phy_ctxt_set_rxchain(mvm, ctxt, &cmd.rlc.rx_chain_info,
182 				     chains_static, chains_dynamic);
183 
184 	return iwl_mvm_send_cmd_pdu(mvm, iwl_cmd_id(RLC_CONFIG_CMD,
185 						    DATA_PATH_GROUP, 2),
186 				    0, sizeof(cmd), &cmd);
187 }
188 
189 /*
190  * Send a command to apply the current phy configuration. The command is send
191  * only if something in the configuration changed: in case that this is the
192  * first time that the phy configuration is applied or in case that the phy
193  * configuration changed from the previous apply.
194  */
iwl_mvm_phy_ctxt_apply(struct iwl_mvm * mvm,struct iwl_mvm_phy_ctxt * ctxt,struct cfg80211_chan_def * chandef,u8 chains_static,u8 chains_dynamic,u32 action)195 static int iwl_mvm_phy_ctxt_apply(struct iwl_mvm *mvm,
196 				  struct iwl_mvm_phy_ctxt *ctxt,
197 				  struct cfg80211_chan_def *chandef,
198 				  u8 chains_static, u8 chains_dynamic,
199 				  u32 action)
200 {
201 	int ret;
202 	int ver = iwl_fw_lookup_cmd_ver(mvm->fw, PHY_CONTEXT_CMD, 1);
203 
204 	if (ver == 3 || ver == 4) {
205 		struct iwl_phy_context_cmd cmd = {};
206 
207 		/* Set the command header fields */
208 		iwl_mvm_phy_ctxt_cmd_hdr(ctxt, &cmd, action);
209 
210 		/* Set the command data */
211 		iwl_mvm_phy_ctxt_cmd_data(mvm, ctxt, &cmd, chandef,
212 					  chains_static,
213 					  chains_dynamic);
214 
215 		ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD,
216 					   0, sizeof(cmd), &cmd);
217 	} else if (ver < 3) {
218 		struct iwl_phy_context_cmd_v1 cmd = {};
219 		u16 len = sizeof(cmd) - iwl_mvm_chan_info_padding(mvm);
220 
221 		/* Set the command header fields */
222 		iwl_mvm_phy_ctxt_cmd_hdr(ctxt,
223 					 (struct iwl_phy_context_cmd *)&cmd,
224 					 action);
225 
226 		/* Set the command data */
227 		iwl_mvm_phy_ctxt_cmd_data_v1(mvm, ctxt, &cmd, chandef,
228 					     chains_static,
229 					     chains_dynamic);
230 		ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD,
231 					   0, len, &cmd);
232 	} else {
233 		IWL_ERR(mvm, "PHY ctxt cmd error ver %d not supported\n", ver);
234 		return -EOPNOTSUPP;
235 	}
236 
237 
238 	if (ret) {
239 		IWL_ERR(mvm, "PHY ctxt cmd error. ret=%d\n", ret);
240 		return ret;
241 	}
242 
243 	if (action != FW_CTXT_ACTION_REMOVE)
244 		return iwl_mvm_phy_send_rlc(mvm, ctxt, chains_static,
245 					    chains_dynamic);
246 
247 	return 0;
248 }
249 
250 /*
251  * Send a command to add a PHY context based on the current HW configuration.
252  */
iwl_mvm_phy_ctxt_add(struct iwl_mvm * mvm,struct iwl_mvm_phy_ctxt * ctxt,struct cfg80211_chan_def * chandef,u8 chains_static,u8 chains_dynamic)253 int iwl_mvm_phy_ctxt_add(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
254 			 struct cfg80211_chan_def *chandef,
255 			 u8 chains_static, u8 chains_dynamic)
256 {
257 	WARN_ON(!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) &&
258 		ctxt->ref);
259 	lockdep_assert_held(&mvm->mutex);
260 
261 	ctxt->channel = chandef->chan;
262 	ctxt->width = chandef->width;
263 	ctxt->center_freq1 = chandef->center_freq1;
264 
265 	return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
266 				      chains_static, chains_dynamic,
267 				      FW_CTXT_ACTION_ADD);
268 }
269 
270 /*
271  * Update the number of references to the given PHY context. This is valid only
272  * in case the PHY context was already created, i.e., its reference count > 0.
273  */
iwl_mvm_phy_ctxt_ref(struct iwl_mvm * mvm,struct iwl_mvm_phy_ctxt * ctxt)274 void iwl_mvm_phy_ctxt_ref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
275 {
276 	lockdep_assert_held(&mvm->mutex);
277 	ctxt->ref++;
278 }
279 
280 /*
281  * Send a command to modify the PHY context based on the current HW
282  * configuration. Note that the function does not check that the configuration
283  * changed.
284  */
iwl_mvm_phy_ctxt_changed(struct iwl_mvm * mvm,struct iwl_mvm_phy_ctxt * ctxt,struct cfg80211_chan_def * chandef,u8 chains_static,u8 chains_dynamic)285 int iwl_mvm_phy_ctxt_changed(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
286 			     struct cfg80211_chan_def *chandef,
287 			     u8 chains_static, u8 chains_dynamic)
288 {
289 	enum iwl_ctxt_action action = FW_CTXT_ACTION_MODIFY;
290 
291 	lockdep_assert_held(&mvm->mutex);
292 
293 	if (iwl_fw_lookup_cmd_ver(mvm->fw, WIDE_ID(DATA_PATH_GROUP, RLC_CONFIG_CMD), 0) >= 2 &&
294 	    ctxt->channel == chandef->chan &&
295 	    ctxt->width == chandef->width &&
296 	    ctxt->center_freq1 == chandef->center_freq1)
297 		return iwl_mvm_phy_send_rlc(mvm, ctxt, chains_static,
298 					    chains_dynamic);
299 
300 	if (fw_has_capa(&mvm->fw->ucode_capa,
301 			IWL_UCODE_TLV_CAPA_BINDING_CDB_SUPPORT) &&
302 	    ctxt->channel->band != chandef->chan->band) {
303 		int ret;
304 
305 		/* ... remove it here ...*/
306 		ret = iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
307 					     chains_static, chains_dynamic,
308 					     FW_CTXT_ACTION_REMOVE);
309 		if (ret)
310 			return ret;
311 
312 		/* ... and proceed to add it again */
313 		action = FW_CTXT_ACTION_ADD;
314 	}
315 
316 	ctxt->channel = chandef->chan;
317 	ctxt->width = chandef->width;
318 	ctxt->center_freq1 = chandef->center_freq1;
319 
320 	return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
321 				      chains_static, chains_dynamic,
322 				      action);
323 }
324 
iwl_mvm_phy_ctxt_unref(struct iwl_mvm * mvm,struct iwl_mvm_phy_ctxt * ctxt)325 void iwl_mvm_phy_ctxt_unref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
326 {
327 	lockdep_assert_held(&mvm->mutex);
328 
329 	if (WARN_ON_ONCE(!ctxt))
330 		return;
331 
332 	ctxt->ref--;
333 
334 	/*
335 	 * Move unused phy's to a default channel. When the phy is moved the,
336 	 * fw will cleanup immediate quiet bit if it was previously set,
337 	 * otherwise we might not be able to reuse this phy.
338 	 */
339 	if (ctxt->ref == 0) {
340 		struct ieee80211_channel *chan = NULL;
341 		struct cfg80211_chan_def chandef;
342 		struct ieee80211_supported_band *sband;
343 		enum nl80211_band band;
344 		int channel;
345 
346 		for (band = NL80211_BAND_2GHZ; band < NUM_NL80211_BANDS; band++) {
347 			sband = mvm->hw->wiphy->bands[band];
348 
349 			if (!sband)
350 				continue;
351 
352 			for (channel = 0; channel < sband->n_channels; channel++)
353 				if (!(sband->channels[channel].flags &
354 						IEEE80211_CHAN_DISABLED)) {
355 					chan = &sband->channels[channel];
356 					break;
357 				}
358 
359 			if (chan)
360 				break;
361 		}
362 
363 		if (WARN_ON(!chan))
364 			return;
365 
366 		cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_NO_HT);
367 		iwl_mvm_phy_ctxt_changed(mvm, ctxt, &chandef, 1, 1);
368 	}
369 }
370 
iwl_mvm_binding_iterator(void * _data,u8 * mac,struct ieee80211_vif * vif)371 static void iwl_mvm_binding_iterator(void *_data, u8 *mac,
372 				     struct ieee80211_vif *vif)
373 {
374 	unsigned long *data = _data;
375 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
376 
377 	if (!mvmvif->deflink.phy_ctxt)
378 		return;
379 
380 	if (vif->type == NL80211_IFTYPE_STATION ||
381 	    vif->type == NL80211_IFTYPE_AP)
382 		__set_bit(mvmvif->deflink.phy_ctxt->id, data);
383 }
384 
iwl_mvm_phy_ctx_count(struct iwl_mvm * mvm)385 int iwl_mvm_phy_ctx_count(struct iwl_mvm *mvm)
386 {
387 	unsigned long phy_ctxt_counter = 0;
388 
389 	ieee80211_iterate_active_interfaces_atomic(mvm->hw,
390 						   IEEE80211_IFACE_ITER_NORMAL,
391 						   iwl_mvm_binding_iterator,
392 						   &phy_ctxt_counter);
393 
394 	return hweight8(phy_ctxt_counter);
395 }
396