1 /******************************************************************************
2  *
3  * This file is provided under a dual BSD/GPLv2 license.  When using or
4  * redistributing this file, you may do so under either license.
5  *
6  * GPL LICENSE SUMMARY
7  *
8  * Copyright(c) 2013 - 2014 Intel Corporation. All rights reserved.
9  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of version 2 of the GNU General Public License as
13  * published by the Free Software Foundation.
14  *
15  * This program is distributed in the hope that it will be useful, but
16  * WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18  * General Public License for more details.
19  *
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21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
23  * USA
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25  * The full GNU General Public License is included in this distribution
26  * in the file called COPYING.
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29  *  Intel Linux Wireless <linuxwifi@intel.com>
30  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
31  *
32  * BSD LICENSE
33  *
34  * Copyright(c) 2013 - 2014 Intel Corporation. All rights reserved.
35  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
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62  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
63  *
64  *****************************************************************************/
65 #include "mvm.h"
66 
67 /* For counting bound interfaces */
68 struct iwl_mvm_active_iface_iterator_data {
69 	struct ieee80211_vif *ignore_vif;
70 	u8 sta_vif_ap_sta_id;
71 	enum iwl_sf_state sta_vif_state;
72 	int num_active_macs;
73 };
74 
75 /*
76  * Count bound interfaces which are not p2p, besides data->ignore_vif.
77  * data->station_vif will point to one bound vif of type station, if exists.
78  */
79 static void iwl_mvm_bound_iface_iterator(void *_data, u8 *mac,
80 					 struct ieee80211_vif *vif)
81 {
82 	struct iwl_mvm_active_iface_iterator_data *data = _data;
83 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
84 
85 	if (vif == data->ignore_vif || !mvmvif->phy_ctxt ||
86 	    vif->type == NL80211_IFTYPE_P2P_DEVICE)
87 		return;
88 
89 	data->num_active_macs++;
90 
91 	if (vif->type == NL80211_IFTYPE_STATION) {
92 		data->sta_vif_ap_sta_id = mvmvif->ap_sta_id;
93 		if (vif->bss_conf.assoc)
94 			data->sta_vif_state = SF_FULL_ON;
95 		else
96 			data->sta_vif_state = SF_INIT_OFF;
97 	}
98 }
99 
100 /*
101  * Aging and idle timeouts for the different possible scenarios
102  * in default configuration
103  */
104 static const
105 __le32 sf_full_timeout_def[SF_NUM_SCENARIO][SF_NUM_TIMEOUT_TYPES] = {
106 	{
107 		cpu_to_le32(SF_SINGLE_UNICAST_AGING_TIMER_DEF),
108 		cpu_to_le32(SF_SINGLE_UNICAST_IDLE_TIMER_DEF)
109 	},
110 	{
111 		cpu_to_le32(SF_AGG_UNICAST_AGING_TIMER_DEF),
112 		cpu_to_le32(SF_AGG_UNICAST_IDLE_TIMER_DEF)
113 	},
114 	{
115 		cpu_to_le32(SF_MCAST_AGING_TIMER_DEF),
116 		cpu_to_le32(SF_MCAST_IDLE_TIMER_DEF)
117 	},
118 	{
119 		cpu_to_le32(SF_BA_AGING_TIMER_DEF),
120 		cpu_to_le32(SF_BA_IDLE_TIMER_DEF)
121 	},
122 	{
123 		cpu_to_le32(SF_TX_RE_AGING_TIMER_DEF),
124 		cpu_to_le32(SF_TX_RE_IDLE_TIMER_DEF)
125 	},
126 };
127 
128 /*
129  * Aging and idle timeouts for the different possible scenarios
130  * in single BSS MAC configuration.
131  */
132 static const __le32 sf_full_timeout[SF_NUM_SCENARIO][SF_NUM_TIMEOUT_TYPES] = {
133 	{
134 		cpu_to_le32(SF_SINGLE_UNICAST_AGING_TIMER),
135 		cpu_to_le32(SF_SINGLE_UNICAST_IDLE_TIMER)
136 	},
137 	{
138 		cpu_to_le32(SF_AGG_UNICAST_AGING_TIMER),
139 		cpu_to_le32(SF_AGG_UNICAST_IDLE_TIMER)
140 	},
141 	{
142 		cpu_to_le32(SF_MCAST_AGING_TIMER),
143 		cpu_to_le32(SF_MCAST_IDLE_TIMER)
144 	},
145 	{
146 		cpu_to_le32(SF_BA_AGING_TIMER),
147 		cpu_to_le32(SF_BA_IDLE_TIMER)
148 	},
149 	{
150 		cpu_to_le32(SF_TX_RE_AGING_TIMER),
151 		cpu_to_le32(SF_TX_RE_IDLE_TIMER)
152 	},
153 };
154 
155 static void iwl_mvm_fill_sf_command(struct iwl_mvm *mvm,
156 				    struct iwl_sf_cfg_cmd *sf_cmd,
157 				    struct ieee80211_sta *sta)
158 {
159 	int i, j, watermark;
160 
161 	sf_cmd->watermark[SF_LONG_DELAY_ON] = cpu_to_le32(SF_W_MARK_SCAN);
162 
163 	/*
164 	 * If we are in association flow - check antenna configuration
165 	 * capabilities of the AP station, and choose the watermark accordingly.
166 	 */
167 	if (sta) {
168 		if (sta->ht_cap.ht_supported || sta->vht_cap.vht_supported) {
169 			switch (sta->rx_nss) {
170 			case 1:
171 				watermark = SF_W_MARK_SISO;
172 				break;
173 			case 2:
174 				watermark = SF_W_MARK_MIMO2;
175 				break;
176 			default:
177 				watermark = SF_W_MARK_MIMO3;
178 				break;
179 			}
180 		} else {
181 			watermark = SF_W_MARK_LEGACY;
182 		}
183 	/* default watermark value for unassociated mode. */
184 	} else {
185 		watermark = SF_W_MARK_MIMO2;
186 	}
187 	sf_cmd->watermark[SF_FULL_ON] = cpu_to_le32(watermark);
188 
189 	for (i = 0; i < SF_NUM_SCENARIO; i++) {
190 		for (j = 0; j < SF_NUM_TIMEOUT_TYPES; j++) {
191 			sf_cmd->long_delay_timeouts[i][j] =
192 					cpu_to_le32(SF_LONG_DELAY_AGING_TIMER);
193 		}
194 	}
195 
196 	if (sta) {
197 		BUILD_BUG_ON(sizeof(sf_full_timeout) !=
198 			     sizeof(__le32) * SF_NUM_SCENARIO *
199 			     SF_NUM_TIMEOUT_TYPES);
200 
201 		memcpy(sf_cmd->full_on_timeouts, sf_full_timeout,
202 		       sizeof(sf_full_timeout));
203 	} else {
204 		BUILD_BUG_ON(sizeof(sf_full_timeout_def) !=
205 			     sizeof(__le32) * SF_NUM_SCENARIO *
206 			     SF_NUM_TIMEOUT_TYPES);
207 
208 		memcpy(sf_cmd->full_on_timeouts, sf_full_timeout_def,
209 		       sizeof(sf_full_timeout_def));
210 	}
211 
212 }
213 
214 static int iwl_mvm_sf_config(struct iwl_mvm *mvm, u8 sta_id,
215 			     enum iwl_sf_state new_state)
216 {
217 	struct iwl_sf_cfg_cmd sf_cmd = {
218 		.state = cpu_to_le32(SF_FULL_ON),
219 	};
220 	struct ieee80211_sta *sta;
221 	int ret = 0;
222 
223 	if (mvm->cfg->disable_dummy_notification)
224 		sf_cmd.state |= cpu_to_le32(SF_CFG_DUMMY_NOTIF_OFF);
225 
226 	/*
227 	 * If an associated AP sta changed its antenna configuration, the state
228 	 * will remain FULL_ON but SF parameters need to be reconsidered.
229 	 */
230 	if (new_state != SF_FULL_ON && mvm->sf_state == new_state)
231 		return 0;
232 
233 	switch (new_state) {
234 	case SF_UNINIT:
235 		iwl_mvm_fill_sf_command(mvm, &sf_cmd, NULL);
236 		break;
237 	case SF_FULL_ON:
238 		if (sta_id == IWL_MVM_STATION_COUNT) {
239 			IWL_ERR(mvm,
240 				"No station: Cannot switch SF to FULL_ON\n");
241 			return -EINVAL;
242 		}
243 		rcu_read_lock();
244 		sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
245 		if (IS_ERR_OR_NULL(sta)) {
246 			IWL_ERR(mvm, "Invalid station id\n");
247 			rcu_read_unlock();
248 			return -EINVAL;
249 		}
250 		iwl_mvm_fill_sf_command(mvm, &sf_cmd, sta);
251 		rcu_read_unlock();
252 		break;
253 	case SF_INIT_OFF:
254 		iwl_mvm_fill_sf_command(mvm, &sf_cmd, NULL);
255 		break;
256 	default:
257 		WARN_ONCE(1, "Invalid state: %d. not sending Smart Fifo cmd\n",
258 			  new_state);
259 		return -EINVAL;
260 	}
261 
262 	ret = iwl_mvm_send_cmd_pdu(mvm, REPLY_SF_CFG_CMD, CMD_ASYNC,
263 				   sizeof(sf_cmd), &sf_cmd);
264 	if (!ret)
265 		mvm->sf_state = new_state;
266 
267 	return ret;
268 }
269 
270 /*
271  * Update Smart fifo:
272  * Count bound interfaces that are not to be removed, ignoring p2p devices,
273  * and set new state accordingly.
274  */
275 int iwl_mvm_sf_update(struct iwl_mvm *mvm, struct ieee80211_vif *changed_vif,
276 		      bool remove_vif)
277 {
278 	enum iwl_sf_state new_state;
279 	u8 sta_id = IWL_MVM_STATION_COUNT;
280 	struct iwl_mvm_vif *mvmvif = NULL;
281 	struct iwl_mvm_active_iface_iterator_data data = {
282 		.ignore_vif = changed_vif,
283 		.sta_vif_state = SF_UNINIT,
284 		.sta_vif_ap_sta_id = IWL_MVM_STATION_COUNT,
285 	};
286 
287 	/*
288 	 * Ignore the call if we are in HW Restart flow, or if the handled
289 	 * vif is a p2p device.
290 	 */
291 	if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) ||
292 	    (changed_vif && changed_vif->type == NL80211_IFTYPE_P2P_DEVICE))
293 		return 0;
294 
295 	ieee80211_iterate_active_interfaces_atomic(mvm->hw,
296 						   IEEE80211_IFACE_ITER_NORMAL,
297 						   iwl_mvm_bound_iface_iterator,
298 						   &data);
299 
300 	/* If changed_vif exists and is not to be removed, add to the count */
301 	if (changed_vif && !remove_vif)
302 		data.num_active_macs++;
303 
304 	switch (data.num_active_macs) {
305 	case 0:
306 		/* If there are no active macs - change state to SF_INIT_OFF */
307 		new_state = SF_INIT_OFF;
308 		break;
309 	case 1:
310 		if (remove_vif) {
311 			/* The one active mac left is of type station
312 			 * and we filled the relevant data during iteration
313 			 */
314 			new_state = data.sta_vif_state;
315 			sta_id = data.sta_vif_ap_sta_id;
316 		} else {
317 			if (WARN_ON(!changed_vif))
318 				return -EINVAL;
319 			if (changed_vif->type != NL80211_IFTYPE_STATION) {
320 				new_state = SF_UNINIT;
321 			} else if (changed_vif->bss_conf.assoc &&
322 				   changed_vif->bss_conf.dtim_period) {
323 				mvmvif = iwl_mvm_vif_from_mac80211(changed_vif);
324 				sta_id = mvmvif->ap_sta_id;
325 				new_state = SF_FULL_ON;
326 			} else {
327 				new_state = SF_INIT_OFF;
328 			}
329 		}
330 		break;
331 	default:
332 		/* If there are multiple active macs - change to SF_UNINIT */
333 		new_state = SF_UNINIT;
334 	}
335 	return iwl_mvm_sf_config(mvm, sta_id, new_state);
336 }
337