drivers/net/wireless/intel/iwlwifi/mvm/time-event.h

   1 /******************************************************************************
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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
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  24  *  Intel Linux Wireless <linuxwifi@intel.com>
  25  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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  60
  61 #ifndef __time_event_h__
  62 #define __time_event_h__
  63
  64 #include "fw-api.h"
  65
  66 #include "mvm.h"
  67
  68 /**
  69  * DOC: Time Events - what is it?
  70  *
  71  * Time Events are a fw feature that allows the driver to control the presence
  72  * of the device on the channel. Since the fw supports multiple channels
  73  * concurrently, the fw may choose to jump to another channel at any time.
  74  * In order to make sure that the fw is on a specific channel at a certain time
  75  * and for a certain duration, the driver needs to issue a time event.
  76  *
  77  * The simplest example is for BSS association. The driver issues a time event,
  78  * waits for it to start, and only then tells mac80211 that we can start the
  79  * association. This way, we make sure that the association will be done
  80  * smoothly and won't be interrupted by channel switch decided within the fw.
  81  */
  82
  83  /**
  84  * DOC: The flow against the fw
  85  *
  86  * When the driver needs to make sure we are in a certain channel, at a certain
  87  * time and for a certain duration, it sends a Time Event. The flow against the
  88  * fw goes like this:
  89  *      1) Driver sends a TIME_EVENT_CMD to the fw
  90  *      2) Driver gets the response for that command. This response contains the
  91  *         Unique ID (UID) of the event.
  92  *      3) The fw sends notification when the event starts.
  93  *
  94  * Of course the API provides various options that allow to cover parameters
  95  * of the flow.
  96  *      What is the duration of the event?
  97  *      What is the start time of the event?
  98  *      Is there an end-time for the event?
  99  *      How much can the event be delayed?
 100  *      Can the event be split?
 101  *      If yes what is the maximal number of chunks?
 102  *      etc...
 103  */
 104
 105 /**
 106  * DOC: Abstraction to the driver
 107  *
 108  * In order to simplify the use of time events to the rest of the driver,
 109  * we abstract the use of time events. This component provides the functions
 110  * needed by the driver.
 111  */
 112
 113 #define IWL_MVM_TE_SESSION_PROTECTION_MAX_TIME_MS 600
 114 #define IWL_MVM_TE_SESSION_PROTECTION_MIN_TIME_MS 400
 115
 116 /**
 117  * iwl_mvm_protect_session - start / extend the session protection.
 118  * @mvm: the mvm component
 119  * @vif: the virtual interface for which the session is issued
 120  * @duration: the duration of the session in TU.
 121  * @min_duration: will start a new session if the current session will end
 122  *      in less than min_duration.
 123  * @max_delay: maximum delay before starting the time event (in TU)
 124  * @wait_for_notif: true if it is required that a time event notification be
 125  *      waited for (that the time event has been scheduled before returning)
 126  *
 127  * This function can be used to start a session protection which means that the
 128  * fw will stay on the channel for %duration_ms milliseconds. This function
 129  * can block (sleep) until the session starts. This function can also be used
 130  * to extend a currently running session.
 131  * This function is meant to be used for BSS association for example, where we
 132  * want to make sure that the fw stays on the channel during the association.
 133  */
 134 void iwl_mvm_protect_session(struct iwl_mvm *mvm,
 135                              struct ieee80211_vif *vif,
 136                              u32 duration, u32 min_duration,
 137                              u32 max_delay, bool wait_for_notif);
 138
 139 /**
 140  * iwl_mvm_stop_session_protection - cancel the session protection.
 141  * @mvm: the mvm component
 142  * @vif: the virtual interface for which the session is issued
 143  *
 144  * This functions cancels the session protection which is an act of good
 145  * citizenship. If it is not needed any more it should be canceled because
 146  * the other bindings wait for the medium during that time.
 147  * This funtions doesn't sleep.
 148  */
 149 void iwl_mvm_stop_session_protection(struct iwl_mvm *mvm,
 150                                       struct ieee80211_vif *vif);
 151
 152 /*
 153  * iwl_mvm_rx_time_event_notif - handles %TIME_EVENT_NOTIFICATION.
 154  */
 155 void iwl_mvm_rx_time_event_notif(struct iwl_mvm *mvm,
 156                                  struct iwl_rx_cmd_buffer *rxb);
 157
 158 /**
 159  * iwl_mvm_start_p2p_roc - start remain on channel for p2p device functionality
 160  * @mvm: the mvm component
 161  * @vif: the virtual interface for which the roc is requested. It is assumed
 162  * that the vif type is NL80211_IFTYPE_P2P_DEVICE
 163  * @duration: the requested duration in millisecond for the fw to be on the
 164  * channel that is bound to the vif.
 165  * @type: the remain on channel request type
 166  *
 167  * This function can be used to issue a remain on channel session,
 168  * which means that the fw will stay in the channel for the request %duration
 169  * milliseconds. The function is async, meaning that it only issues the ROC
 170  * request but does not wait for it to start. Once the FW is ready to serve the
 171  * ROC request, it will issue a notification to the driver that it is on the
 172  * requested channel. Once the FW completes the ROC request it will issue
 173  * another notification to the driver.
 174  */
 175 int iwl_mvm_start_p2p_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 176                           int duration, enum ieee80211_roc_type type);
 177
 178 /**
 179  * iwl_mvm_stop_roc - stop remain on channel functionality
 180  * @mvm: the mvm component
 181  *
 182  * This function can be used to cancel an ongoing ROC session.
 183  * The function is async, it will instruct the FW to stop serving the ROC
 184  * session, but will not wait for the actual stopping of the session.
 185  */
 186 void iwl_mvm_stop_roc(struct iwl_mvm *mvm);
 187
 188 /**
 189  * iwl_mvm_remove_time_event - general function to clean up of time event
 190  * @mvm: the mvm component
 191  * @vif: the vif to which the time event belongs
 192  * @te_data: the time event data that corresponds to that time event
 193  *
 194  * This function can be used to cancel a time event regardless its type.
 195  * It is useful for cleaning up time events running before removing an
 196  * interface.
 197  */
 198 void iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
 199                                struct iwl_mvm_vif *mvmvif,
 200                                struct iwl_mvm_time_event_data *te_data);
 201
 202 /**
 203  * iwl_mvm_te_clear_data - remove time event from list
 204  * @mvm: the mvm component
 205  * @te_data: the time event data to remove
 206  *
 207  * This function is mostly internal, it is made available here only
 208  * for firmware restart purposes.
 209  */
 210 void iwl_mvm_te_clear_data(struct iwl_mvm *mvm,
 211                            struct iwl_mvm_time_event_data *te_data);
 212
 213 void iwl_mvm_cleanup_roc_te(struct iwl_mvm *mvm);
 214 void iwl_mvm_roc_done_wk(struct work_struct *wk);
 215
 216 /**
 217  * iwl_mvm_schedule_csa_period - request channel switch absence period
 218  * @mvm: the mvm component
 219  * @vif: the virtual interface for which the channel switch is issued
 220  * @duration: the duration of the NoA in TU.
 221  * @apply_time: NoA start time in GP2.
 222  *
 223  * This function is used to schedule NoA time event and is used to perform
 224  * the channel switch flow.
 225  */
 226 int iwl_mvm_schedule_csa_period(struct iwl_mvm *mvm,
 227                                 struct ieee80211_vif *vif,
 228                                 u32 duration, u32 apply_time);
 229
 230 /**
 231  * iwl_mvm_te_scheduled - check if the fw received the TE cmd
 232  * @te_data: the time event data that corresponds to that time event
 233  *
 234  * This function returns true iff this TE is added to the fw.
 235  */
 236 static inline bool
 237 iwl_mvm_te_scheduled(struct iwl_mvm_time_event_data *te_data)
 238 {
 239         if (!te_data)
 240                 return false;
 241
 242         return !!te_data->uid;
 243 }
 244
 245 #endif /* __time_event_h__ */