1 /******************************************************************************
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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.
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6  * GPL LICENSE SUMMARY
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8  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
9  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
10  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
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13  * it under the terms of version 2 of the GNU General Public License as
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25  *  Intel Linux Wireless <linuxwifi@intel.com>
26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
27  *
28  * BSD LICENSE
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30  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
31  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
32  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
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62 
63 #include <net/mac80211.h>
64 #include "fw-api.h"
65 #include "mvm.h"
66 
67 #define QUOTA_100	IWL_MVM_MAX_QUOTA
68 #define QUOTA_LOWLAT_MIN ((QUOTA_100 * IWL_MVM_LOWLAT_QUOTA_MIN_PERCENT) / 100)
69 
70 struct iwl_mvm_quota_iterator_data {
71 	int n_interfaces[MAX_BINDINGS];
72 	int colors[MAX_BINDINGS];
73 	int low_latency[MAX_BINDINGS];
74 #ifdef CONFIG_IWLWIFI_DEBUGFS
75 	int dbgfs_min[MAX_BINDINGS];
76 #endif
77 	int n_low_latency_bindings;
78 	struct ieee80211_vif *disabled_vif;
79 };
80 
81 static void iwl_mvm_quota_iterator(void *_data, u8 *mac,
82 				   struct ieee80211_vif *vif)
83 {
84 	struct iwl_mvm_quota_iterator_data *data = _data;
85 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
86 	u16 id;
87 
88 	/* skip disabled interfaces here immediately */
89 	if (vif == data->disabled_vif)
90 		return;
91 
92 	if (!mvmvif->phy_ctxt)
93 		return;
94 
95 	/* currently, PHY ID == binding ID */
96 	id = mvmvif->phy_ctxt->id;
97 
98 	/* need at least one binding per PHY */
99 	BUILD_BUG_ON(NUM_PHY_CTX > MAX_BINDINGS);
100 
101 	if (WARN_ON_ONCE(id >= MAX_BINDINGS))
102 		return;
103 
104 	switch (vif->type) {
105 	case NL80211_IFTYPE_STATION:
106 		if (vif->bss_conf.assoc)
107 			break;
108 		return;
109 	case NL80211_IFTYPE_AP:
110 	case NL80211_IFTYPE_ADHOC:
111 		if (mvmvif->ap_ibss_active)
112 			break;
113 		return;
114 	case NL80211_IFTYPE_MONITOR:
115 		if (mvmvif->monitor_active)
116 			break;
117 		return;
118 	case NL80211_IFTYPE_P2P_DEVICE:
119 		return;
120 	default:
121 		WARN_ON_ONCE(1);
122 		return;
123 	}
124 
125 	if (data->colors[id] < 0)
126 		data->colors[id] = mvmvif->phy_ctxt->color;
127 	else
128 		WARN_ON_ONCE(data->colors[id] != mvmvif->phy_ctxt->color);
129 
130 	data->n_interfaces[id]++;
131 
132 #ifdef CONFIG_IWLWIFI_DEBUGFS
133 	if (mvmvif->dbgfs_quota_min)
134 		data->dbgfs_min[id] = max(data->dbgfs_min[id],
135 					  mvmvif->dbgfs_quota_min);
136 #endif
137 
138 	if (iwl_mvm_vif_low_latency(mvmvif) && !data->low_latency[id]) {
139 		data->n_low_latency_bindings++;
140 		data->low_latency[id] = true;
141 	}
142 }
143 
144 static void iwl_mvm_adjust_quota_for_noa(struct iwl_mvm *mvm,
145 					 struct iwl_time_quota_cmd *cmd)
146 {
147 #ifdef CONFIG_NL80211_TESTMODE
148 	struct iwl_mvm_vif *mvmvif;
149 	int i, phy_id = -1, beacon_int = 0;
150 
151 	if (!mvm->noa_duration || !mvm->noa_vif)
152 		return;
153 
154 	mvmvif = iwl_mvm_vif_from_mac80211(mvm->noa_vif);
155 	if (!mvmvif->ap_ibss_active)
156 		return;
157 
158 	phy_id = mvmvif->phy_ctxt->id;
159 	beacon_int = mvm->noa_vif->bss_conf.beacon_int;
160 
161 	for (i = 0; i < MAX_BINDINGS; i++) {
162 		struct iwl_time_quota_data *data =
163 					iwl_mvm_quota_cmd_get_quota(mvm, cmd,
164 								    i);
165 		u32 id_n_c = le32_to_cpu(data->id_and_color);
166 		u32 id = (id_n_c & FW_CTXT_ID_MSK) >> FW_CTXT_ID_POS;
167 		u32 quota = le32_to_cpu(data->quota);
168 
169 		if (id != phy_id)
170 			continue;
171 
172 		quota *= (beacon_int - mvm->noa_duration);
173 		quota /= beacon_int;
174 
175 		IWL_DEBUG_QUOTA(mvm, "quota: adjust for NoA from %d to %d\n",
176 				le32_to_cpu(data->quota), quota);
177 
178 		data->quota = cpu_to_le32(quota);
179 	}
180 #endif
181 }
182 
183 int iwl_mvm_update_quotas(struct iwl_mvm *mvm,
184 			  bool force_update,
185 			  struct ieee80211_vif *disabled_vif)
186 {
187 	struct iwl_time_quota_cmd cmd = {};
188 	int i, idx, err, num_active_macs, quota, quota_rem, n_non_lowlat;
189 	struct iwl_mvm_quota_iterator_data data = {
190 		.n_interfaces = {},
191 		.colors = { -1, -1, -1, -1 },
192 		.disabled_vif = disabled_vif,
193 	};
194 	struct iwl_time_quota_cmd *last = &mvm->last_quota_cmd;
195 	struct iwl_time_quota_data *qdata, *last_data;
196 	bool send = false;
197 
198 	lockdep_assert_held(&mvm->mutex);
199 
200 	if (fw_has_capa(&mvm->fw->ucode_capa,
201 			IWL_UCODE_TLV_CAPA_DYNAMIC_QUOTA))
202 		return 0;
203 
204 	/* update all upon completion */
205 	if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status))
206 		return 0;
207 
208 	/* iterator data above must match */
209 	BUILD_BUG_ON(MAX_BINDINGS != 4);
210 
211 	ieee80211_iterate_active_interfaces_atomic(
212 		mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
213 		iwl_mvm_quota_iterator, &data);
214 
215 	/*
216 	 * The FW's scheduling session consists of
217 	 * IWL_MVM_MAX_QUOTA fragments. Divide these fragments
218 	 * equally between all the bindings that require quota
219 	 */
220 	num_active_macs = 0;
221 	for (i = 0; i < MAX_BINDINGS; i++) {
222 		qdata = iwl_mvm_quota_cmd_get_quota(mvm, &cmd, i);
223 		qdata->id_and_color = cpu_to_le32(FW_CTXT_INVALID);
224 		num_active_macs += data.n_interfaces[i];
225 	}
226 
227 	n_non_lowlat = num_active_macs;
228 
229 	if (data.n_low_latency_bindings == 1) {
230 		for (i = 0; i < MAX_BINDINGS; i++) {
231 			if (data.low_latency[i]) {
232 				n_non_lowlat -= data.n_interfaces[i];
233 				break;
234 			}
235 		}
236 	}
237 
238 	if (data.n_low_latency_bindings == 1 && n_non_lowlat) {
239 		/*
240 		 * Reserve quota for the low latency binding in case that
241 		 * there are several data bindings but only a single
242 		 * low latency one. Split the rest of the quota equally
243 		 * between the other data interfaces.
244 		 */
245 		quota = (QUOTA_100 - QUOTA_LOWLAT_MIN) / n_non_lowlat;
246 		quota_rem = QUOTA_100 - n_non_lowlat * quota -
247 			    QUOTA_LOWLAT_MIN;
248 		IWL_DEBUG_QUOTA(mvm,
249 				"quota: low-latency binding active, remaining quota per other binding: %d\n",
250 				quota);
251 	} else if (num_active_macs) {
252 		/*
253 		 * There are 0 or more than 1 low latency bindings, or all the
254 		 * data interfaces belong to the single low latency binding.
255 		 * Split the quota equally between the data interfaces.
256 		 */
257 		quota = QUOTA_100 / num_active_macs;
258 		quota_rem = QUOTA_100 % num_active_macs;
259 		IWL_DEBUG_QUOTA(mvm,
260 				"quota: splitting evenly per binding: %d\n",
261 				quota);
262 	} else {
263 		/* values don't really matter - won't be used */
264 		quota = 0;
265 		quota_rem = 0;
266 	}
267 
268 	for (idx = 0, i = 0; i < MAX_BINDINGS; i++) {
269 		if (data.colors[i] < 0)
270 			continue;
271 
272 		qdata = iwl_mvm_quota_cmd_get_quota(mvm, &cmd, idx);
273 
274 		qdata->id_and_color =
275 			cpu_to_le32(FW_CMD_ID_AND_COLOR(i, data.colors[i]));
276 
277 		if (data.n_interfaces[i] <= 0)
278 			qdata->quota = cpu_to_le32(0);
279 #ifdef CONFIG_IWLWIFI_DEBUGFS
280 		else if (data.dbgfs_min[i])
281 			qdata->quota =
282 				cpu_to_le32(data.dbgfs_min[i] * QUOTA_100 / 100);
283 #endif
284 		else if (data.n_low_latency_bindings == 1 && n_non_lowlat &&
285 			 data.low_latency[i])
286 			/*
287 			 * There is more than one binding, but only one of the
288 			 * bindings is in low latency. For this case, allocate
289 			 * the minimal required quota for the low latency
290 			 * binding.
291 			 */
292 			qdata->quota = cpu_to_le32(QUOTA_LOWLAT_MIN);
293 		else
294 			qdata->quota =
295 				cpu_to_le32(quota * data.n_interfaces[i]);
296 
297 		WARN_ONCE(le32_to_cpu(qdata->quota) > QUOTA_100,
298 			  "Binding=%d, quota=%u > max=%u\n",
299 			  idx, le32_to_cpu(qdata->quota), QUOTA_100);
300 
301 		qdata->max_duration = cpu_to_le32(0);
302 
303 		idx++;
304 	}
305 
306 	/* Give the remainder of the session to the first data binding */
307 	for (i = 0; i < MAX_BINDINGS; i++) {
308 		qdata = iwl_mvm_quota_cmd_get_quota(mvm, &cmd, i);
309 		if (le32_to_cpu(qdata->quota) != 0) {
310 			le32_add_cpu(&qdata->quota, quota_rem);
311 			IWL_DEBUG_QUOTA(mvm,
312 					"quota: giving remainder of %d to binding %d\n",
313 					quota_rem, i);
314 			break;
315 		}
316 	}
317 
318 	iwl_mvm_adjust_quota_for_noa(mvm, &cmd);
319 
320 	/* check that we have non-zero quota for all valid bindings */
321 	for (i = 0; i < MAX_BINDINGS; i++) {
322 		qdata = iwl_mvm_quota_cmd_get_quota(mvm, &cmd, i);
323 		last_data = iwl_mvm_quota_cmd_get_quota(mvm, last, i);
324 		if (qdata->id_and_color != last_data->id_and_color)
325 			send = true;
326 		if (qdata->max_duration != last_data->max_duration)
327 			send = true;
328 		if (abs((int)le32_to_cpu(qdata->quota) -
329 			(int)le32_to_cpu(last_data->quota))
330 						> IWL_MVM_QUOTA_THRESHOLD)
331 			send = true;
332 		if (qdata->id_and_color == cpu_to_le32(FW_CTXT_INVALID))
333 			continue;
334 		WARN_ONCE(qdata->quota == 0,
335 			  "zero quota on binding %d\n", i);
336 	}
337 
338 	if (!send && !force_update) {
339 		/* don't send a practically unchanged command, the firmware has
340 		 * to re-initialize a lot of state and that can have an adverse
341 		 * impact on it
342 		 */
343 		return 0;
344 	}
345 
346 	err = iwl_mvm_send_cmd_pdu(mvm, TIME_QUOTA_CMD, 0,
347 				   iwl_mvm_quota_cmd_size(mvm), &cmd);
348 
349 	if (err)
350 		IWL_ERR(mvm, "Failed to send quota: %d\n", err);
351 	else
352 		mvm->last_quota_cmd = cmd;
353 	return err;
354 }
355