1 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */ 2 /* 3 * Copyright (C) 2012-2014, 2019-2020, 2023 Intel Corporation 4 * Copyright (C) 2013-2014 Intel Mobile Communications GmbH 5 */ 6 #ifndef __time_event_h__ 7 #define __time_event_h__ 8 9 #include "fw-api.h" 10 11 #include "mvm.h" 12 13 /** 14 * DOC: Time Events - what is it? 15 * 16 * Time Events are a fw feature that allows the driver to control the presence 17 * of the device on the channel. Since the fw supports multiple channels 18 * concurrently, the fw may choose to jump to another channel at any time. 19 * In order to make sure that the fw is on a specific channel at a certain time 20 * and for a certain duration, the driver needs to issue a time event. 21 * 22 * The simplest example is for BSS association. The driver issues a time event, 23 * waits for it to start, and only then tells mac80211 that we can start the 24 * association. This way, we make sure that the association will be done 25 * smoothly and won't be interrupted by channel switch decided within the fw. 26 */ 27 28 /** 29 * DOC: The flow against the fw 30 * 31 * When the driver needs to make sure we are in a certain channel, at a certain 32 * time and for a certain duration, it sends a Time Event. The flow against the 33 * fw goes like this: 34 * 1) Driver sends a TIME_EVENT_CMD to the fw 35 * 2) Driver gets the response for that command. This response contains the 36 * Unique ID (UID) of the event. 37 * 3) The fw sends notification when the event starts. 38 * 39 * Of course the API provides various options that allow to cover parameters 40 * of the flow. 41 * What is the duration of the event? 42 * What is the start time of the event? 43 * Is there an end-time for the event? 44 * How much can the event be delayed? 45 * Can the event be split? 46 * If yes what is the maximal number of chunks? 47 * etc... 48 */ 49 50 /** 51 * DOC: Abstraction to the driver 52 * 53 * In order to simplify the use of time events to the rest of the driver, 54 * we abstract the use of time events. This component provides the functions 55 * needed by the driver. 56 */ 57 58 #define IWL_MVM_TE_SESSION_PROTECTION_MAX_TIME_MS 600 59 #define IWL_MVM_TE_SESSION_PROTECTION_MIN_TIME_MS 400 60 61 /** 62 * iwl_mvm_protect_session - start / extend the session protection. 63 * @mvm: the mvm component 64 * @vif: the virtual interface for which the session is issued 65 * @duration: the duration of the session in TU. 66 * @min_duration: will start a new session if the current session will end 67 * in less than min_duration. 68 * @max_delay: maximum delay before starting the time event (in TU) 69 * @wait_for_notif: true if it is required that a time event notification be 70 * waited for (that the time event has been scheduled before returning) 71 * 72 * This function can be used to start a session protection which means that the 73 * fw will stay on the channel for %duration_ms milliseconds. This function 74 * can block (sleep) until the session starts. This function can also be used 75 * to extend a currently running session. 76 * This function is meant to be used for BSS association for example, where we 77 * want to make sure that the fw stays on the channel during the association. 78 */ 79 void iwl_mvm_protect_session(struct iwl_mvm *mvm, 80 struct ieee80211_vif *vif, 81 u32 duration, u32 min_duration, 82 u32 max_delay, bool wait_for_notif); 83 84 /** 85 * iwl_mvm_stop_session_protection - cancel the session protection. 86 * @mvm: the mvm component 87 * @vif: the virtual interface for which the session is issued 88 * 89 * This functions cancels the session protection which is an act of good 90 * citizenship. If it is not needed any more it should be canceled because 91 * the other bindings wait for the medium during that time. 92 * This funtions doesn't sleep. 93 */ 94 void iwl_mvm_stop_session_protection(struct iwl_mvm *mvm, 95 struct ieee80211_vif *vif); 96 97 /* 98 * iwl_mvm_rx_time_event_notif - handles %TIME_EVENT_NOTIFICATION. 99 */ 100 void iwl_mvm_rx_time_event_notif(struct iwl_mvm *mvm, 101 struct iwl_rx_cmd_buffer *rxb); 102 103 /** 104 * iwl_mvm_rx_roc_notif - handles %DISCOVERY_ROC_NTF. 105 * @mvm: the mvm component 106 * @rxb: RX buffer 107 */ 108 void iwl_mvm_rx_roc_notif(struct iwl_mvm *mvm, 109 struct iwl_rx_cmd_buffer *rxb); 110 111 /** 112 * iwl_mvm_start_p2p_roc - start remain on channel for p2p device functionality 113 * @mvm: the mvm component 114 * @vif: the virtual interface for which the roc is requested. It is assumed 115 * that the vif type is NL80211_IFTYPE_P2P_DEVICE 116 * @duration: the requested duration in millisecond for the fw to be on the 117 * channel that is bound to the vif. 118 * @type: the remain on channel request type 119 * 120 * This function can be used to issue a remain on channel session, 121 * which means that the fw will stay in the channel for the request %duration 122 * milliseconds. The function is async, meaning that it only issues the ROC 123 * request but does not wait for it to start. Once the FW is ready to serve the 124 * ROC request, it will issue a notification to the driver that it is on the 125 * requested channel. Once the FW completes the ROC request it will issue 126 * another notification to the driver. 127 */ 128 int iwl_mvm_start_p2p_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif, 129 int duration, enum ieee80211_roc_type type); 130 131 /** 132 * iwl_mvm_stop_roc - stop remain on channel functionality 133 * @mvm: the mvm component 134 * @vif: the virtual interface for which the roc is stopped 135 * 136 * This function can be used to cancel an ongoing ROC session. 137 * The function is async, it will instruct the FW to stop serving the ROC 138 * session, but will not wait for the actual stopping of the session. 139 */ 140 void iwl_mvm_stop_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif); 141 142 /** 143 * iwl_mvm_remove_time_event - general function to clean up of time event 144 * @mvm: the mvm component 145 * @mvmvif: the vif to which the time event belongs 146 * @te_data: the time event data that corresponds to that time event 147 * 148 * This function can be used to cancel a time event regardless its type. 149 * It is useful for cleaning up time events running before removing an 150 * interface. 151 */ 152 void iwl_mvm_remove_time_event(struct iwl_mvm *mvm, 153 struct iwl_mvm_vif *mvmvif, 154 struct iwl_mvm_time_event_data *te_data); 155 156 /** 157 * iwl_mvm_te_clear_data - remove time event from list 158 * @mvm: the mvm component 159 * @te_data: the time event data to remove 160 * 161 * This function is mostly internal, it is made available here only 162 * for firmware restart purposes. 163 */ 164 void iwl_mvm_te_clear_data(struct iwl_mvm *mvm, 165 struct iwl_mvm_time_event_data *te_data); 166 167 void iwl_mvm_cleanup_roc_te(struct iwl_mvm *mvm); 168 void iwl_mvm_roc_done_wk(struct work_struct *wk); 169 170 void iwl_mvm_remove_csa_period(struct iwl_mvm *mvm, 171 struct ieee80211_vif *vif); 172 173 /** 174 * iwl_mvm_schedule_csa_period - request channel switch absence period 175 * @mvm: the mvm component 176 * @vif: the virtual interface for which the channel switch is issued 177 * @duration: the duration of the NoA in TU. 178 * @apply_time: NoA start time in GP2. 179 * 180 * This function is used to schedule NoA time event and is used to perform 181 * the channel switch flow. 182 */ 183 int iwl_mvm_schedule_csa_period(struct iwl_mvm *mvm, 184 struct ieee80211_vif *vif, 185 u32 duration, u32 apply_time); 186 187 /** 188 * iwl_mvm_te_scheduled - check if the fw received the TE cmd 189 * @te_data: the time event data that corresponds to that time event 190 * 191 * This function returns true iff this TE is added to the fw. 192 */ 193 static inline bool 194 iwl_mvm_te_scheduled(struct iwl_mvm_time_event_data *te_data) 195 { 196 if (!te_data) 197 return false; 198 199 return !!te_data->uid; 200 } 201 202 /** 203 * iwl_mvm_schedule_session_protection - schedule a session protection 204 * @mvm: the mvm component 205 * @vif: the virtual interface for which the protection issued 206 * @duration: the requested duration of the protection 207 * @min_duration: the minimum duration of the protection 208 * @wait_for_notif: if true, will block until the start of the protection 209 * @link_id: The link to schedule a session protection for 210 */ 211 void iwl_mvm_schedule_session_protection(struct iwl_mvm *mvm, 212 struct ieee80211_vif *vif, 213 u32 duration, u32 min_duration, 214 bool wait_for_notif, 215 unsigned int link_id); 216 217 /** 218 * iwl_mvm_rx_session_protect_notif - handles %SESSION_PROTECTION_NOTIF 219 * @mvm: the mvm component 220 * @rxb: the RX buffer containing the notification 221 */ 222 void iwl_mvm_rx_session_protect_notif(struct iwl_mvm *mvm, 223 struct iwl_rx_cmd_buffer *rxb); 224 225 #endif /* __time_event_h__ */ 226