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

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  63
  64 #ifndef __time_event_h__
  65 #define __time_event_h__
  66
  67 #include "fw-api.h"
  68
  69 #include "mvm.h"
  70
  71 /**
  72  * DOC: Time Events - what is it?
  73  *
  74  * Time Events are a fw feature that allows the driver to control the presence
  75  * of the device on the channel. Since the fw supports multiple channels
  76  * concurrently, the fw may choose to jump to another channel at any time.
  77  * In order to make sure that the fw is on a specific channel at a certain time
  78  * and for a certain duration, the driver needs to issue a time event.
  79  *
  80  * The simplest example is for BSS association. The driver issues a time event,
  81  * waits for it to start, and only then tells mac80211 that we can start the
  82  * association. This way, we make sure that the association will be done
  83  * smoothly and won't be interrupted by channel switch decided within the fw.
  84  */
  85
  86  /**
  87  * DOC: The flow against the fw
  88  *
  89  * When the driver needs to make sure we are in a certain channel, at a certain
  90  * time and for a certain duration, it sends a Time Event. The flow against the
  91  * fw goes like this:
  92  *      1) Driver sends a TIME_EVENT_CMD to the fw
  93  *      2) Driver gets the response for that command. This response contains the
  94  *         Unique ID (UID) of the event.
  95  *      3) The fw sends notification when the event starts.
  96  *
  97  * Of course the API provides various options that allow to cover parameters
  98  * of the flow.
  99  *      What is the duration of the event?
 100  *      What is the start time of the event?
 101  *      Is there an end-time for the event?
 102  *      How much can the event be delayed?
 103  *      Can the event be split?
 104  *      If yes what is the maximal number of chunks?
 105  *      etc...
 106  */
 107
 108 /**
 109  * DOC: Abstraction to the driver
 110  *
 111  * In order to simplify the use of time events to the rest of the driver,
 112  * we abstract the use of time events. This component provides the functions
 113  * needed by the driver.
 114  */
 115
 116 #define IWL_MVM_TE_SESSION_PROTECTION_MAX_TIME_MS 500
 117 #define IWL_MVM_TE_SESSION_PROTECTION_MIN_TIME_MS 400
 118
 119 /**
 120  * iwl_mvm_protect_session - start / extend the session protection.
 121  * @mvm: the mvm component
 122  * @vif: the virtual interface for which the session is issued
 123  * @duration: the duration of the session in TU.
 124  * @min_duration: will start a new session if the current session will end
 125  *      in less than min_duration.
 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  * will 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
 138 /**
 139  * iwl_mvm_stop_session_protection - cancel the session protection.
 140  * @mvm: the mvm component
 141  * @vif: the virtual interface for which the session is issued
 142  *
 143  * This functions cancels the session protection which is an act of good
 144  * citizenship. If it is not needed any more it should be cancelled because
 145  * the other bindings wait for the medium during that time.
 146  * This funtions doesn't sleep.
 147  */
 148 void iwl_mvm_stop_session_protection(struct iwl_mvm *mvm,
 149                                       struct ieee80211_vif *vif);
 150
 151 /*
 152  * iwl_mvm_rx_time_event_notif - handles %TIME_EVENT_NOTIFICATION.
 153  */
 154 int iwl_mvm_rx_time_event_notif(struct iwl_mvm *mvm,
 155                                 struct iwl_rx_cmd_buffer *rxb,
 156                                 struct iwl_device_cmd *cmd);
 157
 158 /**
 159  * iwl_mvm_start_p2p_roc - start remain on channel for p2p device functionlity
 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_p2p_roc - stop remain on channel for p2p device functionlity
 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_p2p_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_roc_done_wk(struct work_struct *wk);
 214
 215 #endif /* __time_event_h__ */