1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2 /*
3  * Copyright (C) 2012-2014, 2018 Intel Corporation
4  * Copyright (C) 2013-2014 Intel Mobile Communications GmbH
5  * Copyright (C) 2016-2017 Intel Deutschland GmbH
6  */
7 #include <net/mac80211.h>
8 #include "fw-api.h"
9 #include "mvm.h"
10 
11 #define QUOTA_100	IWL_MVM_MAX_QUOTA
12 #define QUOTA_LOWLAT_MIN ((QUOTA_100 * IWL_MVM_LOWLAT_QUOTA_MIN_PERCENT) / 100)
13 
14 struct iwl_mvm_quota_iterator_data {
15 	int n_interfaces[MAX_BINDINGS];
16 	int colors[MAX_BINDINGS];
17 	int low_latency[MAX_BINDINGS];
18 #ifdef CONFIG_IWLWIFI_DEBUGFS
19 	int dbgfs_min[MAX_BINDINGS];
20 #endif
21 	int n_low_latency_bindings;
22 	struct ieee80211_vif *disabled_vif;
23 };
24 
25 static void iwl_mvm_quota_iterator(void *_data, u8 *mac,
26 				   struct ieee80211_vif *vif)
27 {
28 	struct iwl_mvm_quota_iterator_data *data = _data;
29 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
30 	u16 id;
31 
32 	/* skip disabled interfaces here immediately */
33 	if (vif == data->disabled_vif)
34 		return;
35 
36 	if (!mvmvif->phy_ctxt)
37 		return;
38 
39 	/* currently, PHY ID == binding ID */
40 	id = mvmvif->phy_ctxt->id;
41 
42 	/* need at least one binding per PHY */
43 	BUILD_BUG_ON(NUM_PHY_CTX > MAX_BINDINGS);
44 
45 	if (WARN_ON_ONCE(id >= MAX_BINDINGS))
46 		return;
47 
48 	switch (vif->type) {
49 	case NL80211_IFTYPE_STATION:
50 		if (vif->bss_conf.assoc)
51 			break;
52 		return;
53 	case NL80211_IFTYPE_AP:
54 	case NL80211_IFTYPE_ADHOC:
55 		if (mvmvif->ap_ibss_active)
56 			break;
57 		return;
58 	case NL80211_IFTYPE_MONITOR:
59 		if (mvmvif->monitor_active)
60 			break;
61 		return;
62 	case NL80211_IFTYPE_P2P_DEVICE:
63 		return;
64 	default:
65 		WARN_ON_ONCE(1);
66 		return;
67 	}
68 
69 	if (data->colors[id] < 0)
70 		data->colors[id] = mvmvif->phy_ctxt->color;
71 	else
72 		WARN_ON_ONCE(data->colors[id] != mvmvif->phy_ctxt->color);
73 
74 	data->n_interfaces[id]++;
75 
76 #ifdef CONFIG_IWLWIFI_DEBUGFS
77 	if (mvmvif->dbgfs_quota_min)
78 		data->dbgfs_min[id] = max(data->dbgfs_min[id],
79 					  mvmvif->dbgfs_quota_min);
80 #endif
81 
82 	if (iwl_mvm_vif_low_latency(mvmvif) && !data->low_latency[id]) {
83 		data->n_low_latency_bindings++;
84 		data->low_latency[id] = true;
85 	}
86 }
87 
88 static void iwl_mvm_adjust_quota_for_noa(struct iwl_mvm *mvm,
89 					 struct iwl_time_quota_cmd *cmd)
90 {
91 #ifdef CONFIG_NL80211_TESTMODE
92 	struct iwl_mvm_vif *mvmvif;
93 	int i, phy_id = -1, beacon_int = 0;
94 
95 	if (!mvm->noa_duration || !mvm->noa_vif)
96 		return;
97 
98 	mvmvif = iwl_mvm_vif_from_mac80211(mvm->noa_vif);
99 	if (!mvmvif->ap_ibss_active)
100 		return;
101 
102 	phy_id = mvmvif->phy_ctxt->id;
103 	beacon_int = mvm->noa_vif->bss_conf.beacon_int;
104 
105 	for (i = 0; i < MAX_BINDINGS; i++) {
106 		struct iwl_time_quota_data *data =
107 					iwl_mvm_quota_cmd_get_quota(mvm, cmd,
108 								    i);
109 		u32 id_n_c = le32_to_cpu(data->id_and_color);
110 		u32 id = (id_n_c & FW_CTXT_ID_MSK) >> FW_CTXT_ID_POS;
111 		u32 quota = le32_to_cpu(data->quota);
112 
113 		if (id != phy_id)
114 			continue;
115 
116 		quota *= (beacon_int - mvm->noa_duration);
117 		quota /= beacon_int;
118 
119 		IWL_DEBUG_QUOTA(mvm, "quota: adjust for NoA from %d to %d\n",
120 				le32_to_cpu(data->quota), quota);
121 
122 		data->quota = cpu_to_le32(quota);
123 	}
124 #endif
125 }
126 
127 int iwl_mvm_update_quotas(struct iwl_mvm *mvm,
128 			  bool force_update,
129 			  struct ieee80211_vif *disabled_vif)
130 {
131 	struct iwl_time_quota_cmd cmd = {};
132 	int i, idx, err, num_active_macs, quota, quota_rem, n_non_lowlat;
133 	struct iwl_mvm_quota_iterator_data data = {
134 		.n_interfaces = {},
135 		.colors = { -1, -1, -1, -1 },
136 		.disabled_vif = disabled_vif,
137 	};
138 	struct iwl_time_quota_cmd *last = &mvm->last_quota_cmd;
139 	struct iwl_time_quota_data *qdata, *last_data;
140 	bool send = false;
141 
142 	lockdep_assert_held(&mvm->mutex);
143 
144 	if (fw_has_capa(&mvm->fw->ucode_capa,
145 			IWL_UCODE_TLV_CAPA_DYNAMIC_QUOTA))
146 		return 0;
147 
148 	/* update all upon completion */
149 	if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status))
150 		return 0;
151 
152 	/* iterator data above must match */
153 	BUILD_BUG_ON(MAX_BINDINGS != 4);
154 
155 	ieee80211_iterate_active_interfaces_atomic(
156 		mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
157 		iwl_mvm_quota_iterator, &data);
158 
159 	/*
160 	 * The FW's scheduling session consists of
161 	 * IWL_MVM_MAX_QUOTA fragments. Divide these fragments
162 	 * equally between all the bindings that require quota
163 	 */
164 	num_active_macs = 0;
165 	for (i = 0; i < MAX_BINDINGS; i++) {
166 		qdata = iwl_mvm_quota_cmd_get_quota(mvm, &cmd, i);
167 		qdata->id_and_color = cpu_to_le32(FW_CTXT_INVALID);
168 		num_active_macs += data.n_interfaces[i];
169 	}
170 
171 	n_non_lowlat = num_active_macs;
172 
173 	if (data.n_low_latency_bindings == 1) {
174 		for (i = 0; i < MAX_BINDINGS; i++) {
175 			if (data.low_latency[i]) {
176 				n_non_lowlat -= data.n_interfaces[i];
177 				break;
178 			}
179 		}
180 	}
181 
182 	if (data.n_low_latency_bindings == 1 && n_non_lowlat) {
183 		/*
184 		 * Reserve quota for the low latency binding in case that
185 		 * there are several data bindings but only a single
186 		 * low latency one. Split the rest of the quota equally
187 		 * between the other data interfaces.
188 		 */
189 		quota = (QUOTA_100 - QUOTA_LOWLAT_MIN) / n_non_lowlat;
190 		quota_rem = QUOTA_100 - n_non_lowlat * quota -
191 			    QUOTA_LOWLAT_MIN;
192 		IWL_DEBUG_QUOTA(mvm,
193 				"quota: low-latency binding active, remaining quota per other binding: %d\n",
194 				quota);
195 	} else if (num_active_macs) {
196 		/*
197 		 * There are 0 or more than 1 low latency bindings, or all the
198 		 * data interfaces belong to the single low latency binding.
199 		 * Split the quota equally between the data interfaces.
200 		 */
201 		quota = QUOTA_100 / num_active_macs;
202 		quota_rem = QUOTA_100 % num_active_macs;
203 		IWL_DEBUG_QUOTA(mvm,
204 				"quota: splitting evenly per binding: %d\n",
205 				quota);
206 	} else {
207 		/* values don't really matter - won't be used */
208 		quota = 0;
209 		quota_rem = 0;
210 	}
211 
212 	for (idx = 0, i = 0; i < MAX_BINDINGS; i++) {
213 		if (data.colors[i] < 0)
214 			continue;
215 
216 		qdata = iwl_mvm_quota_cmd_get_quota(mvm, &cmd, idx);
217 
218 		qdata->id_and_color =
219 			cpu_to_le32(FW_CMD_ID_AND_COLOR(i, data.colors[i]));
220 
221 		if (data.n_interfaces[i] <= 0)
222 			qdata->quota = cpu_to_le32(0);
223 #ifdef CONFIG_IWLWIFI_DEBUGFS
224 		else if (data.dbgfs_min[i])
225 			qdata->quota =
226 				cpu_to_le32(data.dbgfs_min[i] * QUOTA_100 / 100);
227 #endif
228 		else if (data.n_low_latency_bindings == 1 && n_non_lowlat &&
229 			 data.low_latency[i])
230 			/*
231 			 * There is more than one binding, but only one of the
232 			 * bindings is in low latency. For this case, allocate
233 			 * the minimal required quota for the low latency
234 			 * binding.
235 			 */
236 			qdata->quota = cpu_to_le32(QUOTA_LOWLAT_MIN);
237 		else
238 			qdata->quota =
239 				cpu_to_le32(quota * data.n_interfaces[i]);
240 
241 		WARN_ONCE(le32_to_cpu(qdata->quota) > QUOTA_100,
242 			  "Binding=%d, quota=%u > max=%u\n",
243 			  idx, le32_to_cpu(qdata->quota), QUOTA_100);
244 
245 		qdata->max_duration = cpu_to_le32(0);
246 
247 		idx++;
248 	}
249 
250 	/* Give the remainder of the session to the first data binding */
251 	for (i = 0; i < MAX_BINDINGS; i++) {
252 		qdata = iwl_mvm_quota_cmd_get_quota(mvm, &cmd, i);
253 		if (le32_to_cpu(qdata->quota) != 0) {
254 			le32_add_cpu(&qdata->quota, quota_rem);
255 			IWL_DEBUG_QUOTA(mvm,
256 					"quota: giving remainder of %d to binding %d\n",
257 					quota_rem, i);
258 			break;
259 		}
260 	}
261 
262 	iwl_mvm_adjust_quota_for_noa(mvm, &cmd);
263 
264 	/* check that we have non-zero quota for all valid bindings */
265 	for (i = 0; i < MAX_BINDINGS; i++) {
266 		qdata = iwl_mvm_quota_cmd_get_quota(mvm, &cmd, i);
267 		last_data = iwl_mvm_quota_cmd_get_quota(mvm, last, i);
268 		if (qdata->id_and_color != last_data->id_and_color)
269 			send = true;
270 		if (qdata->max_duration != last_data->max_duration)
271 			send = true;
272 		if (abs((int)le32_to_cpu(qdata->quota) -
273 			(int)le32_to_cpu(last_data->quota))
274 						> IWL_MVM_QUOTA_THRESHOLD)
275 			send = true;
276 		if (qdata->id_and_color == cpu_to_le32(FW_CTXT_INVALID))
277 			continue;
278 		WARN_ONCE(qdata->quota == 0,
279 			  "zero quota on binding %d\n", i);
280 	}
281 
282 	if (!send && !force_update) {
283 		/* don't send a practically unchanged command, the firmware has
284 		 * to re-initialize a lot of state and that can have an adverse
285 		 * impact on it
286 		 */
287 		return 0;
288 	}
289 
290 	err = iwl_mvm_send_cmd_pdu(mvm, TIME_QUOTA_CMD, 0,
291 				   iwl_mvm_quota_cmd_size(mvm), &cmd);
292 
293 	if (err)
294 		IWL_ERR(mvm, "Failed to send quota: %d\n", err);
295 	else
296 		mvm->last_quota_cmd = cmd;
297 	return err;
298 }
299