1 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */ 2 /* 3 * Copyright (C) 2005-2014, 2018-2021 Intel Corporation 4 * Copyright (C) 2013-2014 Intel Mobile Communications GmbH 5 * Copyright (C) 2015 Intel Deutschland GmbH 6 */ 7 #ifndef __iwl_op_mode_h__ 8 #define __iwl_op_mode_h__ 9 10 #include <linux/netdevice.h> 11 #include <linux/debugfs.h> 12 #include "iwl-dbg-tlv.h" 13 14 struct iwl_op_mode; 15 struct iwl_trans; 16 struct sk_buff; 17 struct iwl_device_cmd; 18 struct iwl_rx_cmd_buffer; 19 struct iwl_fw; 20 struct iwl_cfg; 21 22 /** 23 * DOC: Operational mode - what is it ? 24 * 25 * The operational mode (a.k.a. op_mode) is the layer that implements 26 * mac80211's handlers. It knows two APIs: mac80211's and the fw's. It uses 27 * the transport API to access the HW. The op_mode doesn't need to know how the 28 * underlying HW works, since the transport layer takes care of that. 29 * 30 * There can be several op_mode: i.e. different fw APIs will require two 31 * different op_modes. This is why the op_mode is virtualized. 32 */ 33 34 /** 35 * DOC: Life cycle of the Operational mode 36 * 37 * The operational mode has a very simple life cycle. 38 * 39 * 1) The driver layer (iwl-drv.c) chooses the op_mode based on the 40 * capabilities advertised by the fw file (in TLV format). 41 * 2) The driver layer starts the op_mode (ops->start) 42 * 3) The op_mode registers mac80211 43 * 4) The op_mode is governed by mac80211 44 * 5) The driver layer stops the op_mode 45 */ 46 47 /** 48 * struct iwl_op_mode_ops - op_mode specific operations 49 * 50 * The op_mode exports its ops so that external components can start it and 51 * interact with it. The driver layer typically calls the start and stop 52 * handlers, the transport layer calls the others. 53 * 54 * All the handlers MUST be implemented, except @rx_rss which can be left 55 * out *iff* the opmode will never run on hardware with multi-queue capability. 56 * 57 * @start: start the op_mode. The transport layer is already allocated. 58 * May sleep 59 * @stop: stop the op_mode. Must free all the memory allocated. 60 * May sleep 61 * @rx: Rx notification to the op_mode. rxb is the Rx buffer itself. Cmd is the 62 * HCMD this Rx responds to. Can't sleep. 63 * @rx_rss: data queue RX notification to the op_mode, for (data) notifications 64 * received on the RSS queue(s). The queue parameter indicates which of the 65 * RSS queues received this frame; it will always be non-zero. 66 * This method must not sleep. 67 * @queue_full: notifies that a HW queue is full. 68 * Must be atomic and called with BH disabled. 69 * @queue_not_full: notifies that a HW queue is not full any more. 70 * Must be atomic and called with BH disabled. 71 * @hw_rf_kill: notifies of a change in the HW rf kill switch. True means that 72 * the radio is killed. Return %true if the device should be stopped by 73 * the transport immediately after the call. May sleep. 74 * Note that this must not return %true for newer devices using gen2 PCIe 75 * transport. 76 * @free_skb: allows the transport layer to free skbs that haven't been 77 * reclaimed by the op_mode. This can happen when the driver is freed and 78 * there are Tx packets pending in the transport layer. 79 * Must be atomic 80 * @nic_error: error notification. Must be atomic and must be called with BH 81 * disabled, unless the sync parameter is true. 82 * @cmd_queue_full: Called when the command queue gets full. Must be atomic and 83 * called with BH disabled. 84 * @nic_config: configure NIC, called before firmware is started. 85 * May sleep 86 * @wimax_active: invoked when WiMax becomes active. May sleep 87 * @time_point: called when transport layer wants to collect debug data 88 */ 89 struct iwl_op_mode_ops { 90 struct iwl_op_mode *(*start)(struct iwl_trans *trans, 91 const struct iwl_cfg *cfg, 92 const struct iwl_fw *fw, 93 struct dentry *dbgfs_dir); 94 void (*stop)(struct iwl_op_mode *op_mode); 95 void (*rx)(struct iwl_op_mode *op_mode, struct napi_struct *napi, 96 struct iwl_rx_cmd_buffer *rxb); 97 void (*rx_rss)(struct iwl_op_mode *op_mode, struct napi_struct *napi, 98 struct iwl_rx_cmd_buffer *rxb, unsigned int queue); 99 void (*queue_full)(struct iwl_op_mode *op_mode, int queue); 100 void (*queue_not_full)(struct iwl_op_mode *op_mode, int queue); 101 bool (*hw_rf_kill)(struct iwl_op_mode *op_mode, bool state); 102 void (*free_skb)(struct iwl_op_mode *op_mode, struct sk_buff *skb); 103 void (*nic_error)(struct iwl_op_mode *op_mode, bool sync); 104 void (*cmd_queue_full)(struct iwl_op_mode *op_mode); 105 void (*nic_config)(struct iwl_op_mode *op_mode); 106 void (*wimax_active)(struct iwl_op_mode *op_mode); 107 void (*time_point)(struct iwl_op_mode *op_mode, 108 enum iwl_fw_ini_time_point tp_id, 109 union iwl_dbg_tlv_tp_data *tp_data); 110 }; 111 112 int iwl_opmode_register(const char *name, const struct iwl_op_mode_ops *ops); 113 void iwl_opmode_deregister(const char *name); 114 115 /** 116 * struct iwl_op_mode - operational mode 117 * @ops: pointer to its own ops 118 * 119 * This holds an implementation of the mac80211 / fw API. 120 */ 121 struct iwl_op_mode { 122 const struct iwl_op_mode_ops *ops; 123 124 char op_mode_specific[] __aligned(sizeof(void *)); 125 }; 126 127 static inline void iwl_op_mode_stop(struct iwl_op_mode *op_mode) 128 { 129 might_sleep(); 130 op_mode->ops->stop(op_mode); 131 } 132 133 static inline void iwl_op_mode_rx(struct iwl_op_mode *op_mode, 134 struct napi_struct *napi, 135 struct iwl_rx_cmd_buffer *rxb) 136 { 137 return op_mode->ops->rx(op_mode, napi, rxb); 138 } 139 140 static inline void iwl_op_mode_rx_rss(struct iwl_op_mode *op_mode, 141 struct napi_struct *napi, 142 struct iwl_rx_cmd_buffer *rxb, 143 unsigned int queue) 144 { 145 op_mode->ops->rx_rss(op_mode, napi, rxb, queue); 146 } 147 148 static inline void iwl_op_mode_queue_full(struct iwl_op_mode *op_mode, 149 int queue) 150 { 151 op_mode->ops->queue_full(op_mode, queue); 152 } 153 154 static inline void iwl_op_mode_queue_not_full(struct iwl_op_mode *op_mode, 155 int queue) 156 { 157 op_mode->ops->queue_not_full(op_mode, queue); 158 } 159 160 static inline bool __must_check 161 iwl_op_mode_hw_rf_kill(struct iwl_op_mode *op_mode, bool state) 162 { 163 might_sleep(); 164 return op_mode->ops->hw_rf_kill(op_mode, state); 165 } 166 167 static inline void iwl_op_mode_free_skb(struct iwl_op_mode *op_mode, 168 struct sk_buff *skb) 169 { 170 if (WARN_ON_ONCE(!op_mode)) 171 return; 172 op_mode->ops->free_skb(op_mode, skb); 173 } 174 175 static inline void iwl_op_mode_nic_error(struct iwl_op_mode *op_mode, bool sync) 176 { 177 op_mode->ops->nic_error(op_mode, sync); 178 } 179 180 static inline void iwl_op_mode_cmd_queue_full(struct iwl_op_mode *op_mode) 181 { 182 op_mode->ops->cmd_queue_full(op_mode); 183 } 184 185 static inline void iwl_op_mode_nic_config(struct iwl_op_mode *op_mode) 186 { 187 might_sleep(); 188 op_mode->ops->nic_config(op_mode); 189 } 190 191 static inline void iwl_op_mode_wimax_active(struct iwl_op_mode *op_mode) 192 { 193 might_sleep(); 194 op_mode->ops->wimax_active(op_mode); 195 } 196 197 static inline void iwl_op_mode_time_point(struct iwl_op_mode *op_mode, 198 enum iwl_fw_ini_time_point tp_id, 199 union iwl_dbg_tlv_tp_data *tp_data) 200 { 201 if (!op_mode || !op_mode->ops || !op_mode->ops->time_point) 202 return; 203 op_mode->ops->time_point(op_mode, tp_id, tp_data); 204 } 205 206 #endif /* __iwl_op_mode_h__ */ 207