1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2 /*
3  * Copyright (C) 2022 - 2023 Intel Corporation
4  */
5 #include "mvm.h"
6 #include "time-event.h"
7 
8 static u32 iwl_mvm_get_free_fw_link_id(struct iwl_mvm *mvm,
9 				       struct iwl_mvm_vif *mvm_vif)
10 {
11 	u32 link_id;
12 
13 	lockdep_assert_held(&mvm->mutex);
14 
15 	link_id = ffz(mvm->fw_link_ids_map);
16 
17 	/* this case can happen if there're deactivated but not removed links */
18 	if (link_id > IWL_MVM_FW_MAX_LINK_ID)
19 		return IWL_MVM_FW_LINK_ID_INVALID;
20 
21 	mvm->fw_link_ids_map |= BIT(link_id);
22 	return link_id;
23 }
24 
25 static void iwl_mvm_release_fw_link_id(struct iwl_mvm *mvm, u32 link_id)
26 {
27 	lockdep_assert_held(&mvm->mutex);
28 
29 	if (!WARN_ON(link_id > IWL_MVM_FW_MAX_LINK_ID))
30 		mvm->fw_link_ids_map &= ~BIT(link_id);
31 }
32 
33 static int iwl_mvm_link_cmd_send(struct iwl_mvm *mvm,
34 				 struct iwl_link_config_cmd *cmd,
35 				 enum iwl_ctxt_action action)
36 {
37 	int ret;
38 
39 	cmd->action = cpu_to_le32(action);
40 	ret = iwl_mvm_send_cmd_pdu(mvm,
41 				   WIDE_ID(MAC_CONF_GROUP, LINK_CONFIG_CMD), 0,
42 				   sizeof(*cmd), cmd);
43 	if (ret)
44 		IWL_ERR(mvm, "Failed to send LINK_CONFIG_CMD (action:%d): %d\n",
45 			action, ret);
46 	return ret;
47 }
48 
49 int iwl_mvm_add_link(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
50 		     struct ieee80211_bss_conf *link_conf)
51 {
52 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
53 	unsigned int link_id = link_conf->link_id;
54 	struct iwl_mvm_vif_link_info *link_info = mvmvif->link[link_id];
55 	struct iwl_link_config_cmd cmd = {};
56 
57 	if (WARN_ON_ONCE(!link_info))
58 		return -EINVAL;
59 
60 	if (link_info->fw_link_id == IWL_MVM_FW_LINK_ID_INVALID) {
61 		link_info->fw_link_id = iwl_mvm_get_free_fw_link_id(mvm,
62 								    mvmvif);
63 		if (link_info->fw_link_id >= ARRAY_SIZE(mvm->link_id_to_link_conf))
64 			return -EINVAL;
65 
66 		rcu_assign_pointer(mvm->link_id_to_link_conf[link_info->fw_link_id],
67 				   link_conf);
68 	}
69 
70 	/* Update SF - Disable if needed. if this fails, SF might still be on
71 	 * while many macs are bound, which is forbidden - so fail the binding.
72 	 */
73 	if (iwl_mvm_sf_update(mvm, vif, false))
74 		return -EINVAL;
75 
76 	cmd.link_id = cpu_to_le32(link_info->fw_link_id);
77 	cmd.mac_id = cpu_to_le32(mvmvif->id);
78 	cmd.spec_link_id = link_conf->link_id;
79 	WARN_ON_ONCE(link_info->phy_ctxt);
80 	cmd.phy_id = cpu_to_le32(FW_CTXT_INVALID);
81 
82 	memcpy(cmd.local_link_addr, link_conf->addr, ETH_ALEN);
83 
84 	if (vif->type == NL80211_IFTYPE_ADHOC && link_conf->bssid)
85 		memcpy(cmd.ibss_bssid_addr, link_conf->bssid, ETH_ALEN);
86 
87 	cmd.listen_lmac = cpu_to_le32(link_info->listen_lmac);
88 
89 	return iwl_mvm_link_cmd_send(mvm, &cmd, FW_CTXT_ACTION_ADD);
90 }
91 
92 int iwl_mvm_link_changed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
93 			 struct ieee80211_bss_conf *link_conf,
94 			 u32 changes, bool active)
95 {
96 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
97 	unsigned int link_id = link_conf->link_id;
98 	struct iwl_mvm_vif_link_info *link_info = mvmvif->link[link_id];
99 	struct iwl_mvm_phy_ctxt *phyctxt;
100 	struct iwl_link_config_cmd cmd = {};
101 	u32 ht_flag, flags = 0, flags_mask = 0;
102 	int ret;
103 
104 	if (WARN_ON_ONCE(!link_info ||
105 			 link_info->fw_link_id == IWL_MVM_FW_LINK_ID_INVALID))
106 		return -EINVAL;
107 
108 	if (changes & LINK_CONTEXT_MODIFY_ACTIVE) {
109 		/* When activating a link, phy context should be valid;
110 		 * when deactivating a link, it also should be valid since
111 		 * the link was active before. So, do nothing in this case.
112 		 * Since a link is added first with FW_CTXT_INVALID, then we
113 		 * can get here in case it's removed before it was activated.
114 		 */
115 		if (!link_info->phy_ctxt)
116 			return 0;
117 
118 		/* Catch early if driver tries to activate or deactivate a link
119 		 * twice.
120 		 */
121 		WARN_ON_ONCE(active == link_info->active);
122 
123 		/* When deactivating a link session protection should
124 		 * be stopped
125 		 */
126 		if (!active && vif->type == NL80211_IFTYPE_STATION)
127 			iwl_mvm_stop_session_protection(mvm, vif);
128 	}
129 
130 	cmd.link_id = cpu_to_le32(link_info->fw_link_id);
131 
132 	/* The phy_id, link address and listen_lmac can be modified only until
133 	 * the link becomes active, otherwise they will be ignored.
134 	 */
135 	phyctxt = link_info->phy_ctxt;
136 	if (phyctxt)
137 		cmd.phy_id = cpu_to_le32(phyctxt->id);
138 	else
139 		cmd.phy_id = cpu_to_le32(FW_CTXT_INVALID);
140 	cmd.mac_id = cpu_to_le32(mvmvif->id);
141 
142 	memcpy(cmd.local_link_addr, link_conf->addr, ETH_ALEN);
143 
144 	cmd.active = cpu_to_le32(active);
145 
146 	if (vif->type == NL80211_IFTYPE_ADHOC && link_conf->bssid)
147 		memcpy(cmd.ibss_bssid_addr, link_conf->bssid, ETH_ALEN);
148 
149 	iwl_mvm_set_fw_basic_rates(mvm, vif, link_conf,
150 				   &cmd.cck_rates, &cmd.ofdm_rates);
151 
152 	cmd.cck_short_preamble = cpu_to_le32(link_conf->use_short_preamble);
153 	cmd.short_slot = cpu_to_le32(link_conf->use_short_slot);
154 
155 	/* The fw does not distinguish between ht and fat */
156 	ht_flag = LINK_PROT_FLG_HT_PROT | LINK_PROT_FLG_FAT_PROT;
157 	iwl_mvm_set_fw_protection_flags(mvm, vif, link_conf,
158 					&cmd.protection_flags,
159 					ht_flag, LINK_PROT_FLG_TGG_PROTECT);
160 
161 	iwl_mvm_set_fw_qos_params(mvm, vif, link_conf, cmd.ac,
162 				  &cmd.qos_flags);
163 
164 
165 	cmd.bi = cpu_to_le32(link_conf->beacon_int);
166 	cmd.dtim_interval = cpu_to_le32(link_conf->beacon_int *
167 					link_conf->dtim_period);
168 
169 	if (!link_conf->he_support || iwlwifi_mod_params.disable_11ax ||
170 	    (vif->type == NL80211_IFTYPE_STATION && !vif->cfg.assoc)) {
171 		changes &= ~LINK_CONTEXT_MODIFY_HE_PARAMS;
172 		goto send_cmd;
173 	}
174 
175 	cmd.htc_trig_based_pkt_ext = link_conf->htc_trig_based_pkt_ext;
176 
177 	if (link_conf->uora_exists) {
178 		cmd.rand_alloc_ecwmin =
179 			link_conf->uora_ocw_range & 0x7;
180 		cmd.rand_alloc_ecwmax =
181 			(link_conf->uora_ocw_range >> 3) & 0x7;
182 	}
183 
184 	/* TODO  how to set ndp_fdbk_buff_th_exp? */
185 
186 	if (iwl_mvm_set_fw_mu_edca_params(mvm, mvmvif->link[link_id],
187 					  &cmd.trig_based_txf[0])) {
188 		flags |= LINK_FLG_MU_EDCA_CW;
189 		flags_mask |= LINK_FLG_MU_EDCA_CW;
190 	}
191 
192 	if (changes & LINK_CONTEXT_MODIFY_EHT_PARAMS) {
193 		if (iwlwifi_mod_params.disable_11be ||
194 		    !link_conf->eht_support)
195 			changes &= ~LINK_CONTEXT_MODIFY_EHT_PARAMS;
196 		else
197 			cmd.puncture_mask =
198 				cpu_to_le16(link_conf->eht_puncturing);
199 	}
200 
201 	cmd.bss_color = link_conf->he_bss_color.color;
202 
203 	if (!link_conf->he_bss_color.enabled) {
204 		flags |= LINK_FLG_BSS_COLOR_DIS;
205 		flags_mask |= LINK_FLG_BSS_COLOR_DIS;
206 	}
207 
208 	cmd.frame_time_rts_th = cpu_to_le16(link_conf->frame_time_rts_th);
209 
210 	/* Block 26-tone RU OFDMA transmissions */
211 	if (link_info->he_ru_2mhz_block) {
212 		flags |= LINK_FLG_RU_2MHZ_BLOCK;
213 		flags_mask |= LINK_FLG_RU_2MHZ_BLOCK;
214 	}
215 
216 	if (link_conf->nontransmitted) {
217 		ether_addr_copy(cmd.ref_bssid_addr,
218 				link_conf->transmitter_bssid);
219 		cmd.bssid_index = link_conf->bssid_index;
220 	}
221 
222 send_cmd:
223 	cmd.modify_mask = cpu_to_le32(changes);
224 	cmd.flags = cpu_to_le32(flags);
225 	cmd.flags_mask = cpu_to_le32(flags_mask);
226 	cmd.spec_link_id = link_conf->link_id;
227 	cmd.listen_lmac = cpu_to_le32(link_info->listen_lmac);
228 
229 	ret = iwl_mvm_link_cmd_send(mvm, &cmd, FW_CTXT_ACTION_MODIFY);
230 	if (!ret && (changes & LINK_CONTEXT_MODIFY_ACTIVE))
231 		link_info->active = active;
232 
233 	return ret;
234 }
235 
236 int iwl_mvm_remove_link(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
237 			struct ieee80211_bss_conf *link_conf)
238 {
239 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
240 	unsigned int link_id = link_conf->link_id;
241 	struct iwl_mvm_vif_link_info *link_info = mvmvif->link[link_id];
242 	struct iwl_link_config_cmd cmd = {};
243 	int ret;
244 
245 	if (WARN_ON(!link_info ||
246 		    link_info->fw_link_id >= ARRAY_SIZE(mvm->link_id_to_link_conf)))
247 		return -EINVAL;
248 
249 	RCU_INIT_POINTER(mvm->link_id_to_link_conf[link_info->fw_link_id],
250 			 NULL);
251 	cmd.link_id = cpu_to_le32(link_info->fw_link_id);
252 	iwl_mvm_release_fw_link_id(mvm, link_info->fw_link_id);
253 	link_info->fw_link_id = IWL_MVM_FW_LINK_ID_INVALID;
254 	cmd.spec_link_id = link_conf->link_id;
255 
256 	ret = iwl_mvm_link_cmd_send(mvm, &cmd, FW_CTXT_ACTION_REMOVE);
257 
258 	if (!ret)
259 		if (iwl_mvm_sf_update(mvm, vif, true))
260 			IWL_ERR(mvm, "Failed to update SF state\n");
261 
262 	return ret;
263 }
264 
265 /* link should be deactivated before removal, so in most cases we need to
266  * perform these two operations together
267  */
268 int iwl_mvm_disable_link(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
269 			 struct ieee80211_bss_conf *link_conf)
270 {
271 	int ret;
272 
273 	ret = iwl_mvm_link_changed(mvm, vif, link_conf,
274 				   LINK_CONTEXT_MODIFY_ACTIVE, false);
275 	if (ret)
276 		return ret;
277 
278 	ret = iwl_mvm_remove_link(mvm, vif, link_conf);
279 	if (ret)
280 		return ret;
281 
282 	return ret;
283 }
284