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

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   8  * Copyright(c) 2007 - 2014 Intel Corporation. All rights reserved.
   9  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
  10  * Copyright(c) 2015        Intel Deutschland GmbH
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  64 #ifndef __iwl_op_mode_h__
  65 #define __iwl_op_mode_h__
  66
  67 #include <linux/netdevice.h>
  68 #include <linux/debugfs.h>
  69
  70 struct iwl_op_mode;
  71 struct iwl_trans;
  72 struct sk_buff;
  73 struct iwl_device_cmd;
  74 struct iwl_rx_cmd_buffer;
  75 struct iwl_fw;
  76 struct iwl_cfg;
  77
  78 /**
  79  * DOC: Operational mode - what is it ?
  80  *
  81  * The operational mode (a.k.a. op_mode) is the layer that implements
  82  * mac80211's handlers. It knows two APIs: mac80211's and the fw's. It uses
  83  * the transport API to access the HW. The op_mode doesn't need to know how the
  84  * underlying HW works, since the transport layer takes care of that.
  85  *
  86  * There can be several op_mode: i.e. different fw APIs will require two
  87  * different op_modes. This is why the op_mode is virtualized.
  88  */
  89
  90 /**
  91  * DOC: Life cycle of the Operational mode
  92  *
  93  * The operational mode has a very simple life cycle.
  94  *
  95  *      1) The driver layer (iwl-drv.c) chooses the op_mode based on the
  96  *         capabilities advertised by the fw file (in TLV format).
  97  *      2) The driver layer starts the op_mode (ops->start)
  98  *      3) The op_mode registers mac80211
  99  *      4) The op_mode is governed by mac80211
 100  *      5) The driver layer stops the op_mode
 101  */
 102
 103 /**
 104  * struct iwl_op_mode_ops - op_mode specific operations
 105  *
 106  * The op_mode exports its ops so that external components can start it and
 107  * interact with it. The driver layer typically calls the start and stop
 108  * handlers, the transport layer calls the others.
 109  *
 110  * All the handlers MUST be implemented, except @rx_rss which can be left
 111  * out *iff* the opmode will never run on hardware with multi-queue capability.
 112  *
 113  * @start: start the op_mode. The transport layer is already allocated.
 114  *      May sleep
 115  * @stop: stop the op_mode. Must free all the memory allocated.
 116  *      May sleep
 117  * @rx: Rx notification to the op_mode. rxb is the Rx buffer itself. Cmd is the
 118  *      HCMD this Rx responds to. Can't sleep.
 119  * @rx_rss: data queue RX notification to the op_mode, for (data) notifications
 120  *      received on the RSS queue(s). The queue parameter indicates which of the
 121  *      RSS queues received this frame; it will always be non-zero.
 122  *      This method must not sleep.
 123  * @async_cb: called when an ASYNC command with CMD_WANT_ASYNC_CALLBACK set
 124  *      completes. Must be atomic.
 125  * @queue_full: notifies that a HW queue is full.
 126  *      Must be atomic and called with BH disabled.
 127  * @queue_not_full: notifies that a HW queue is not full any more.
 128  *      Must be atomic and called with BH disabled.
 129  * @hw_rf_kill:notifies of a change in the HW rf kill switch. True means that
 130  *      the radio is killed. Return %true if the device should be stopped by
 131  *      the transport immediately after the call. May sleep.
 132  * @free_skb: allows the transport layer to free skbs that haven't been
 133  *      reclaimed by the op_mode. This can happen when the driver is freed and
 134  *      there are Tx packets pending in the transport layer.
 135  *      Must be atomic
 136  * @nic_error: error notification. Must be atomic and must be called with BH
 137  *      disabled.
 138  * @cmd_queue_full: Called when the command queue gets full. Must be atomic and
 139  *      called with BH disabled.
 140  * @nic_config: configure NIC, called before firmware is started.
 141  *      May sleep
 142  * @wimax_active: invoked when WiMax becomes active. May sleep
 143  */
 144 struct iwl_op_mode_ops {
 145         struct iwl_op_mode *(*start)(struct iwl_trans *trans,
 146                                      const struct iwl_cfg *cfg,
 147                                      const struct iwl_fw *fw,
 148                                      struct dentry *dbgfs_dir);
 149         void (*stop)(struct iwl_op_mode *op_mode);
 150         void (*rx)(struct iwl_op_mode *op_mode, struct napi_struct *napi,
 151                    struct iwl_rx_cmd_buffer *rxb);
 152         void (*rx_rss)(struct iwl_op_mode *op_mode, struct napi_struct *napi,
 153                        struct iwl_rx_cmd_buffer *rxb, unsigned int queue);
 154         void (*async_cb)(struct iwl_op_mode *op_mode,
 155                          const struct iwl_device_cmd *cmd);
 156         void (*queue_full)(struct iwl_op_mode *op_mode, int queue);
 157         void (*queue_not_full)(struct iwl_op_mode *op_mode, int queue);
 158         bool (*hw_rf_kill)(struct iwl_op_mode *op_mode, bool state);
 159         void (*free_skb)(struct iwl_op_mode *op_mode, struct sk_buff *skb);
 160         void (*nic_error)(struct iwl_op_mode *op_mode);
 161         void (*cmd_queue_full)(struct iwl_op_mode *op_mode);
 162         void (*nic_config)(struct iwl_op_mode *op_mode);
 163         void (*wimax_active)(struct iwl_op_mode *op_mode);
 164 };
 165
 166 int iwl_opmode_register(const char *name, const struct iwl_op_mode_ops *ops);
 167 void iwl_opmode_deregister(const char *name);
 168
 169 /**
 170  * struct iwl_op_mode - operational mode
 171  * @ops: pointer to its own ops
 172  *
 173  * This holds an implementation of the mac80211 / fw API.
 174  */
 175 struct iwl_op_mode {
 176         const struct iwl_op_mode_ops *ops;
 177
 178         char op_mode_specific[0] __aligned(sizeof(void *));
 179 };
 180
 181 static inline void iwl_op_mode_stop(struct iwl_op_mode *op_mode)
 182 {
 183         might_sleep();
 184         op_mode->ops->stop(op_mode);
 185 }
 186
 187 static inline void iwl_op_mode_rx(struct iwl_op_mode *op_mode,
 188                                   struct napi_struct *napi,
 189                                   struct iwl_rx_cmd_buffer *rxb)
 190 {
 191         return op_mode->ops->rx(op_mode, napi, rxb);
 192 }
 193
 194 static inline void iwl_op_mode_rx_rss(struct iwl_op_mode *op_mode,
 195                                       struct napi_struct *napi,
 196                                       struct iwl_rx_cmd_buffer *rxb,
 197                                       unsigned int queue)
 198 {
 199         op_mode->ops->rx_rss(op_mode, napi, rxb, queue);
 200 }
 201
 202 static inline void iwl_op_mode_async_cb(struct iwl_op_mode *op_mode,
 203                                         const struct iwl_device_cmd *cmd)
 204 {
 205         if (op_mode->ops->async_cb)
 206                 op_mode->ops->async_cb(op_mode, cmd);
 207 }
 208
 209 static inline void iwl_op_mode_queue_full(struct iwl_op_mode *op_mode,
 210                                           int queue)
 211 {
 212         op_mode->ops->queue_full(op_mode, queue);
 213 }
 214
 215 static inline void iwl_op_mode_queue_not_full(struct iwl_op_mode *op_mode,
 216                                               int queue)
 217 {
 218         op_mode->ops->queue_not_full(op_mode, queue);
 219 }
 220
 221 static inline bool __must_check
 222 iwl_op_mode_hw_rf_kill(struct iwl_op_mode *op_mode, bool state)
 223 {
 224         might_sleep();
 225         return op_mode->ops->hw_rf_kill(op_mode, state);
 226 }
 227
 228 static inline void iwl_op_mode_free_skb(struct iwl_op_mode *op_mode,
 229                                         struct sk_buff *skb)
 230 {
 231         op_mode->ops->free_skb(op_mode, skb);
 232 }
 233
 234 static inline void iwl_op_mode_nic_error(struct iwl_op_mode *op_mode)
 235 {
 236         op_mode->ops->nic_error(op_mode);
 237 }
 238
 239 static inline void iwl_op_mode_cmd_queue_full(struct iwl_op_mode *op_mode)
 240 {
 241         op_mode->ops->cmd_queue_full(op_mode);
 242 }
 243
 244 static inline void iwl_op_mode_nic_config(struct iwl_op_mode *op_mode)
 245 {
 246         might_sleep();
 247         op_mode->ops->nic_config(op_mode);
 248 }
 249
 250 static inline void iwl_op_mode_wimax_active(struct iwl_op_mode *op_mode)
 251 {
 252         might_sleep();
 253         op_mode->ops->wimax_active(op_mode);
 254 }
 255
 256 #endif /* __iwl_op_mode_h__ */