1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2007-2012 Siemens AG 4 * 5 * Written by: 6 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com> 7 */ 8 9 #include <linux/kernel.h> 10 #include <linux/module.h> 11 #include <linux/netdevice.h> 12 13 #include <net/netlink.h> 14 #include <net/nl802154.h> 15 #include <net/mac802154.h> 16 #include <net/ieee802154_netdev.h> 17 #include <net/route.h> 18 #include <net/cfg802154.h> 19 20 #include "ieee802154_i.h" 21 #include "cfg.h" 22 23 static void ieee802154_tasklet_handler(struct tasklet_struct *t) 24 { 25 struct ieee802154_local *local = from_tasklet(local, t, tasklet); 26 struct sk_buff *skb; 27 28 while ((skb = skb_dequeue(&local->skb_queue))) { 29 switch (skb->pkt_type) { 30 case IEEE802154_RX_MSG: 31 /* Clear skb->pkt_type in order to not confuse kernel 32 * netstack. 33 */ 34 skb->pkt_type = 0; 35 ieee802154_rx(local, skb); 36 break; 37 default: 38 WARN(1, "mac802154: Packet is of unknown type %d\n", 39 skb->pkt_type); 40 kfree_skb(skb); 41 break; 42 } 43 } 44 } 45 46 struct ieee802154_hw * 47 ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops) 48 { 49 struct wpan_phy *phy; 50 struct ieee802154_local *local; 51 size_t priv_size; 52 53 if (WARN_ON(!ops || !(ops->xmit_async || ops->xmit_sync) || !ops->ed || 54 !ops->start || !ops->stop || !ops->set_channel)) 55 return NULL; 56 57 /* Ensure 32-byte alignment of our private data and hw private data. 58 * We use the wpan_phy priv data for both our ieee802154_local and for 59 * the driver's private data 60 * 61 * in memory it'll be like this: 62 * 63 * +-------------------------+ 64 * | struct wpan_phy | 65 * +-------------------------+ 66 * | struct ieee802154_local | 67 * +-------------------------+ 68 * | driver's private data | 69 * +-------------------------+ 70 * 71 * Due to ieee802154 layer isn't aware of driver and MAC structures, 72 * so lets align them here. 73 */ 74 75 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len; 76 77 phy = wpan_phy_new(&mac802154_config_ops, priv_size); 78 if (!phy) { 79 pr_err("failure to allocate master IEEE802.15.4 device\n"); 80 return NULL; 81 } 82 83 phy->privid = mac802154_wpan_phy_privid; 84 85 local = wpan_phy_priv(phy); 86 local->phy = phy; 87 local->hw.phy = local->phy; 88 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN); 89 local->ops = ops; 90 91 INIT_LIST_HEAD(&local->interfaces); 92 INIT_LIST_HEAD(&local->rx_beacon_list); 93 INIT_LIST_HEAD(&local->rx_mac_cmd_list); 94 mutex_init(&local->iflist_mtx); 95 96 tasklet_setup(&local->tasklet, ieee802154_tasklet_handler); 97 98 skb_queue_head_init(&local->skb_queue); 99 100 INIT_WORK(&local->sync_tx_work, ieee802154_xmit_sync_worker); 101 INIT_DELAYED_WORK(&local->scan_work, mac802154_scan_worker); 102 INIT_WORK(&local->rx_beacon_work, mac802154_rx_beacon_worker); 103 INIT_DELAYED_WORK(&local->beacon_work, mac802154_beacon_worker); 104 INIT_WORK(&local->rx_mac_cmd_work, mac802154_rx_mac_cmd_worker); 105 106 init_completion(&local->assoc_done); 107 108 /* init supported flags with 802.15.4 default ranges */ 109 phy->supported.max_minbe = 8; 110 phy->supported.min_maxbe = 3; 111 phy->supported.max_maxbe = 8; 112 phy->supported.min_frame_retries = 0; 113 phy->supported.max_frame_retries = 7; 114 phy->supported.max_csma_backoffs = 5; 115 phy->supported.lbt = NL802154_SUPPORTED_BOOL_FALSE; 116 117 /* always supported */ 118 phy->supported.iftypes = BIT(NL802154_IFTYPE_NODE) | BIT(NL802154_IFTYPE_COORD); 119 120 return &local->hw; 121 } 122 EXPORT_SYMBOL(ieee802154_alloc_hw); 123 124 void ieee802154_configure_durations(struct wpan_phy *phy, 125 unsigned int page, unsigned int channel) 126 { 127 u32 duration = 0; 128 129 switch (page) { 130 case 0: 131 if (BIT(channel) & 0x1) 132 /* 868 MHz BPSK 802.15.4-2003: 20 ksym/s */ 133 duration = 50 * NSEC_PER_USEC; 134 else if (BIT(channel) & 0x7FE) 135 /* 915 MHz BPSK 802.15.4-2003: 40 ksym/s */ 136 duration = 25 * NSEC_PER_USEC; 137 else if (BIT(channel) & 0x7FFF800) 138 /* 2400 MHz O-QPSK 802.15.4-2006: 62.5 ksym/s */ 139 duration = 16 * NSEC_PER_USEC; 140 break; 141 case 2: 142 if (BIT(channel) & 0x1) 143 /* 868 MHz O-QPSK 802.15.4-2006: 25 ksym/s */ 144 duration = 40 * NSEC_PER_USEC; 145 else if (BIT(channel) & 0x7FE) 146 /* 915 MHz O-QPSK 802.15.4-2006: 62.5 ksym/s */ 147 duration = 16 * NSEC_PER_USEC; 148 break; 149 case 3: 150 if (BIT(channel) & 0x3FFF) 151 /* 2.4 GHz CSS 802.15.4a-2007: 1/6 Msym/s */ 152 duration = 6 * NSEC_PER_USEC; 153 break; 154 default: 155 break; 156 } 157 158 if (!duration) { 159 pr_debug("Unknown PHY symbol duration\n"); 160 return; 161 } 162 163 phy->symbol_duration = duration; 164 phy->lifs_period = 165 (IEEE802154_LIFS_PERIOD * phy->symbol_duration) / NSEC_PER_USEC; 166 phy->sifs_period = 167 (IEEE802154_SIFS_PERIOD * phy->symbol_duration) / NSEC_PER_USEC; 168 } 169 EXPORT_SYMBOL(ieee802154_configure_durations); 170 171 void ieee802154_free_hw(struct ieee802154_hw *hw) 172 { 173 struct ieee802154_local *local = hw_to_local(hw); 174 175 BUG_ON(!list_empty(&local->interfaces)); 176 177 mutex_destroy(&local->iflist_mtx); 178 179 wpan_phy_free(local->phy); 180 } 181 EXPORT_SYMBOL(ieee802154_free_hw); 182 183 static void ieee802154_setup_wpan_phy_pib(struct wpan_phy *wpan_phy) 184 { 185 /* TODO warn on empty symbol_duration 186 * Should be done when all drivers sets this value. 187 */ 188 189 wpan_phy->lifs_period = (IEEE802154_LIFS_PERIOD * 190 wpan_phy->symbol_duration) / NSEC_PER_USEC; 191 wpan_phy->sifs_period = (IEEE802154_SIFS_PERIOD * 192 wpan_phy->symbol_duration) / NSEC_PER_USEC; 193 } 194 195 int ieee802154_register_hw(struct ieee802154_hw *hw) 196 { 197 struct ieee802154_local *local = hw_to_local(hw); 198 char mac_wq_name[IFNAMSIZ + 10] = {}; 199 struct net_device *dev; 200 int rc = -ENOSYS; 201 202 local->workqueue = 203 create_singlethread_workqueue(wpan_phy_name(local->phy)); 204 if (!local->workqueue) { 205 rc = -ENOMEM; 206 goto out; 207 } 208 209 snprintf(mac_wq_name, IFNAMSIZ + 10, "%s-mac-cmds", wpan_phy_name(local->phy)); 210 local->mac_wq = create_singlethread_workqueue(mac_wq_name); 211 if (!local->mac_wq) { 212 rc = -ENOMEM; 213 goto out_wq; 214 } 215 216 hrtimer_init(&local->ifs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 217 local->ifs_timer.function = ieee802154_xmit_ifs_timer; 218 219 wpan_phy_set_dev(local->phy, local->hw.parent); 220 221 ieee802154_setup_wpan_phy_pib(local->phy); 222 223 ieee802154_configure_durations(local->phy, local->phy->current_page, 224 local->phy->current_channel); 225 226 if (!(hw->flags & IEEE802154_HW_CSMA_PARAMS)) { 227 local->phy->supported.min_csma_backoffs = 4; 228 local->phy->supported.max_csma_backoffs = 4; 229 local->phy->supported.min_maxbe = 5; 230 local->phy->supported.max_maxbe = 5; 231 local->phy->supported.min_minbe = 3; 232 local->phy->supported.max_minbe = 3; 233 } 234 235 if (!(hw->flags & IEEE802154_HW_FRAME_RETRIES)) { 236 local->phy->supported.min_frame_retries = 3; 237 local->phy->supported.max_frame_retries = 3; 238 } 239 240 if (hw->flags & IEEE802154_HW_PROMISCUOUS) 241 local->phy->supported.iftypes |= BIT(NL802154_IFTYPE_MONITOR); 242 243 rc = wpan_phy_register(local->phy); 244 if (rc < 0) 245 goto out_mac_wq; 246 247 rtnl_lock(); 248 249 dev = ieee802154_if_add(local, "wpan%d", NET_NAME_ENUM, 250 NL802154_IFTYPE_NODE, 251 cpu_to_le64(0x0000000000000000ULL)); 252 if (IS_ERR(dev)) { 253 rtnl_unlock(); 254 rc = PTR_ERR(dev); 255 goto out_phy; 256 } 257 258 rtnl_unlock(); 259 260 return 0; 261 262 out_phy: 263 wpan_phy_unregister(local->phy); 264 out_mac_wq: 265 destroy_workqueue(local->mac_wq); 266 out_wq: 267 destroy_workqueue(local->workqueue); 268 out: 269 return rc; 270 } 271 EXPORT_SYMBOL(ieee802154_register_hw); 272 273 void ieee802154_unregister_hw(struct ieee802154_hw *hw) 274 { 275 struct ieee802154_local *local = hw_to_local(hw); 276 277 tasklet_kill(&local->tasklet); 278 flush_workqueue(local->workqueue); 279 280 rtnl_lock(); 281 282 ieee802154_remove_interfaces(local); 283 284 rtnl_unlock(); 285 286 destroy_workqueue(local->mac_wq); 287 destroy_workqueue(local->workqueue); 288 wpan_phy_unregister(local->phy); 289 } 290 EXPORT_SYMBOL(ieee802154_unregister_hw); 291 292 static int __init ieee802154_init(void) 293 { 294 return ieee802154_iface_init(); 295 } 296 297 static void __exit ieee802154_exit(void) 298 { 299 ieee802154_iface_exit(); 300 301 rcu_barrier(); 302 } 303 304 subsys_initcall(ieee802154_init); 305 module_exit(ieee802154_exit); 306 307 MODULE_DESCRIPTION("IEEE 802.15.4 subsystem"); 308 MODULE_LICENSE("GPL v2"); 309