drivers/net/wireless/intel/iwlwifi/iwl-op-mode.h

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  67 #ifndef __iwl_op_mode_h__
  68 #define __iwl_op_mode_h__
  69
  70 #include <linux/netdevice.h>
  71 #include <linux/debugfs.h>
  72
  73 struct iwl_op_mode;
  74 struct iwl_trans;
  75 struct sk_buff;
  76 struct iwl_device_cmd;
  77 struct iwl_rx_cmd_buffer;
  78 struct iwl_fw;
  79 struct iwl_cfg;
  80
  81 /**
  82  * DOC: Operational mode - what is it ?
  83  *
  84  * The operational mode (a.k.a. op_mode) is the layer that implements
  85  * mac80211's handlers. It knows two APIs: mac80211's and the fw's. It uses
  86  * the transport API to access the HW. The op_mode doesn't need to know how the
  87  * underlying HW works, since the transport layer takes care of that.
  88  *
  89  * There can be several op_mode: i.e. different fw APIs will require two
  90  * different op_modes. This is why the op_mode is virtualized.
  91  */
  92
  93 /**
  94  * DOC: Life cycle of the Operational mode
  95  *
  96  * The operational mode has a very simple life cycle.
  97  *
  98  *      1) The driver layer (iwl-drv.c) chooses the op_mode based on the
  99  *         capabilities advertised by the fw file (in TLV format).
 100  *      2) The driver layer starts the op_mode (ops->start)
 101  *      3) The op_mode registers mac80211
 102  *      4) The op_mode is governed by mac80211
 103  *      5) The driver layer stops the op_mode
 104  */
 105
 106 /**
 107  * struct iwl_op_mode_ops - op_mode specific operations
 108  *
 109  * The op_mode exports its ops so that external components can start it and
 110  * interact with it. The driver layer typically calls the start and stop
 111  * handlers, the transport layer calls the others.
 112  *
 113  * All the handlers MUST be implemented, except @rx_rss which can be left
 114  * out *iff* the opmode will never run on hardware with multi-queue capability.
 115  *
 116  * @start: start the op_mode. The transport layer is already allocated.
 117  *      May sleep
 118  * @stop: stop the op_mode. Must free all the memory allocated.
 119  *      May sleep
 120  * @rx: Rx notification to the op_mode. rxb is the Rx buffer itself. Cmd is the
 121  *      HCMD this Rx responds to. Can't sleep.
 122  * @rx_rss: data queue RX notification to the op_mode, for (data) notifications
 123  *      received on the RSS queue(s). The queue parameter indicates which of the
 124  *      RSS queues received this frame; it will always be non-zero.
 125  *      This method must not sleep.
 126  * @async_cb: called when an ASYNC command with CMD_WANT_ASYNC_CALLBACK set
 127  *      completes. Must be atomic.
 128  * @queue_full: notifies that a HW queue is full.
 129  *      Must be atomic and called with BH disabled.
 130  * @queue_not_full: notifies that a HW queue is not full any more.
 131  *      Must be atomic and called with BH disabled.
 132  * @hw_rf_kill:notifies of a change in the HW rf kill switch. True means that
 133  *      the radio is killed. Return %true if the device should be stopped by
 134  *      the transport immediately after the call. May sleep.
 135  * @free_skb: allows the transport layer to free skbs that haven't been
 136  *      reclaimed by the op_mode. This can happen when the driver is freed and
 137  *      there are Tx packets pending in the transport layer.
 138  *      Must be atomic
 139  * @nic_error: error notification. Must be atomic and must be called with BH
 140  *      disabled.
 141  * @cmd_queue_full: Called when the command queue gets full. Must be atomic and
 142  *      called with BH disabled.
 143  * @nic_config: configure NIC, called before firmware is started.
 144  *      May sleep
 145  * @wimax_active: invoked when WiMax becomes active. May sleep
 146  * @enter_d0i3: configure the fw to enter d0i3. return 1 to indicate d0i3
 147  *      entrance is aborted (e.g. due to held reference). May sleep.
 148  * @exit_d0i3: configure the fw to exit d0i3. May sleep.
 149  */
 150 struct iwl_op_mode_ops {
 151         struct iwl_op_mode *(*start)(struct iwl_trans *trans,
 152                                      const struct iwl_cfg *cfg,
 153                                      const struct iwl_fw *fw,
 154                                      struct dentry *dbgfs_dir);
 155         void (*stop)(struct iwl_op_mode *op_mode);
 156         void (*rx)(struct iwl_op_mode *op_mode, struct napi_struct *napi,
 157                    struct iwl_rx_cmd_buffer *rxb);
 158         void (*rx_rss)(struct iwl_op_mode *op_mode, struct napi_struct *napi,
 159                        struct iwl_rx_cmd_buffer *rxb, unsigned int queue);
 160         void (*async_cb)(struct iwl_op_mode *op_mode,
 161                          const struct iwl_device_cmd *cmd);
 162         void (*queue_full)(struct iwl_op_mode *op_mode, int queue);
 163         void (*queue_not_full)(struct iwl_op_mode *op_mode, int queue);
 164         bool (*hw_rf_kill)(struct iwl_op_mode *op_mode, bool state);
 165         void (*free_skb)(struct iwl_op_mode *op_mode, struct sk_buff *skb);
 166         void (*nic_error)(struct iwl_op_mode *op_mode);
 167         void (*cmd_queue_full)(struct iwl_op_mode *op_mode);
 168         void (*nic_config)(struct iwl_op_mode *op_mode);
 169         void (*wimax_active)(struct iwl_op_mode *op_mode);
 170         int (*enter_d0i3)(struct iwl_op_mode *op_mode);
 171         int (*exit_d0i3)(struct iwl_op_mode *op_mode);
 172 };
 173
 174 int iwl_opmode_register(const char *name, const struct iwl_op_mode_ops *ops);
 175 void iwl_opmode_deregister(const char *name);
 176
 177 /**
 178  * struct iwl_op_mode - operational mode
 179  * @ops: pointer to its own ops
 180  *
 181  * This holds an implementation of the mac80211 / fw API.
 182  */
 183 struct iwl_op_mode {
 184         const struct iwl_op_mode_ops *ops;
 185
 186         char op_mode_specific[0] __aligned(sizeof(void *));
 187 };
 188
 189 static inline void iwl_op_mode_stop(struct iwl_op_mode *op_mode)
 190 {
 191         might_sleep();
 192         op_mode->ops->stop(op_mode);
 193 }
 194
 195 static inline void iwl_op_mode_rx(struct iwl_op_mode *op_mode,
 196                                   struct napi_struct *napi,
 197                                   struct iwl_rx_cmd_buffer *rxb)
 198 {
 199         return op_mode->ops->rx(op_mode, napi, rxb);
 200 }
 201
 202 static inline void iwl_op_mode_rx_rss(struct iwl_op_mode *op_mode,
 203                                       struct napi_struct *napi,
 204                                       struct iwl_rx_cmd_buffer *rxb,
 205                                       unsigned int queue)
 206 {
 207         op_mode->ops->rx_rss(op_mode, napi, rxb, queue);
 208 }
 209
 210 static inline void iwl_op_mode_async_cb(struct iwl_op_mode *op_mode,
 211                                         const struct iwl_device_cmd *cmd)
 212 {
 213         if (op_mode->ops->async_cb)
 214                 op_mode->ops->async_cb(op_mode, cmd);
 215 }
 216
 217 static inline void iwl_op_mode_queue_full(struct iwl_op_mode *op_mode,
 218                                           int queue)
 219 {
 220         op_mode->ops->queue_full(op_mode, queue);
 221 }
 222
 223 static inline void iwl_op_mode_queue_not_full(struct iwl_op_mode *op_mode,
 224                                               int queue)
 225 {
 226         op_mode->ops->queue_not_full(op_mode, queue);
 227 }
 228
 229 static inline bool __must_check
 230 iwl_op_mode_hw_rf_kill(struct iwl_op_mode *op_mode, bool state)
 231 {
 232         might_sleep();
 233         return op_mode->ops->hw_rf_kill(op_mode, state);
 234 }
 235
 236 static inline void iwl_op_mode_free_skb(struct iwl_op_mode *op_mode,
 237                                         struct sk_buff *skb)
 238 {
 239         op_mode->ops->free_skb(op_mode, skb);
 240 }
 241
 242 static inline void iwl_op_mode_nic_error(struct iwl_op_mode *op_mode)
 243 {
 244         op_mode->ops->nic_error(op_mode);
 245 }
 246
 247 static inline void iwl_op_mode_cmd_queue_full(struct iwl_op_mode *op_mode)
 248 {
 249         op_mode->ops->cmd_queue_full(op_mode);
 250 }
 251
 252 static inline void iwl_op_mode_nic_config(struct iwl_op_mode *op_mode)
 253 {
 254         might_sleep();
 255         op_mode->ops->nic_config(op_mode);
 256 }
 257
 258 static inline void iwl_op_mode_wimax_active(struct iwl_op_mode *op_mode)
 259 {
 260         might_sleep();
 261         op_mode->ops->wimax_active(op_mode);
 262 }
 263
 264 static inline int iwl_op_mode_enter_d0i3(struct iwl_op_mode *op_mode)
 265 {
 266         might_sleep();
 267
 268         if (!op_mode->ops->enter_d0i3)
 269                 return 0;
 270         return op_mode->ops->enter_d0i3(op_mode);
 271 }
 272
 273 static inline int iwl_op_mode_exit_d0i3(struct iwl_op_mode *op_mode)
 274 {
 275         might_sleep();
 276
 277         if (!op_mode->ops->exit_d0i3)
 278                 return 0;
 279         return op_mode->ops->exit_d0i3(op_mode);
 280 }
 281
 282 #endif /* __iwl_op_mode_h__ */