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 mutex_init(&local->iflist_mtx); 94 95 tasklet_setup(&local->tasklet, ieee802154_tasklet_handler); 96 97 skb_queue_head_init(&local->skb_queue); 98 99 INIT_WORK(&local->sync_tx_work, ieee802154_xmit_sync_worker); 100 INIT_DELAYED_WORK(&local->scan_work, mac802154_scan_worker); 101 INIT_WORK(&local->rx_beacon_work, mac802154_rx_beacon_worker); 102 INIT_DELAYED_WORK(&local->beacon_work, mac802154_beacon_worker); 103 104 /* init supported flags with 802.15.4 default ranges */ 105 phy->supported.max_minbe = 8; 106 phy->supported.min_maxbe = 3; 107 phy->supported.max_maxbe = 8; 108 phy->supported.min_frame_retries = 0; 109 phy->supported.max_frame_retries = 7; 110 phy->supported.max_csma_backoffs = 5; 111 phy->supported.lbt = NL802154_SUPPORTED_BOOL_FALSE; 112 113 /* always supported */ 114 phy->supported.iftypes = BIT(NL802154_IFTYPE_NODE) | BIT(NL802154_IFTYPE_COORD); 115 116 return &local->hw; 117 } 118 EXPORT_SYMBOL(ieee802154_alloc_hw); 119 120 void ieee802154_configure_durations(struct wpan_phy *phy, 121 unsigned int page, unsigned int channel) 122 { 123 u32 duration = 0; 124 125 switch (page) { 126 case 0: 127 if (BIT(channel) & 0x1) 128 /* 868 MHz BPSK 802.15.4-2003: 20 ksym/s */ 129 duration = 50 * NSEC_PER_USEC; 130 else if (BIT(channel) & 0x7FE) 131 /* 915 MHz BPSK 802.15.4-2003: 40 ksym/s */ 132 duration = 25 * NSEC_PER_USEC; 133 else if (BIT(channel) & 0x7FFF800) 134 /* 2400 MHz O-QPSK 802.15.4-2006: 62.5 ksym/s */ 135 duration = 16 * NSEC_PER_USEC; 136 break; 137 case 2: 138 if (BIT(channel) & 0x1) 139 /* 868 MHz O-QPSK 802.15.4-2006: 25 ksym/s */ 140 duration = 40 * NSEC_PER_USEC; 141 else if (BIT(channel) & 0x7FE) 142 /* 915 MHz O-QPSK 802.15.4-2006: 62.5 ksym/s */ 143 duration = 16 * NSEC_PER_USEC; 144 break; 145 case 3: 146 if (BIT(channel) & 0x3FFF) 147 /* 2.4 GHz CSS 802.15.4a-2007: 1/6 Msym/s */ 148 duration = 6 * NSEC_PER_USEC; 149 break; 150 default: 151 break; 152 } 153 154 if (!duration) { 155 pr_debug("Unknown PHY symbol duration\n"); 156 return; 157 } 158 159 phy->symbol_duration = duration; 160 phy->lifs_period = (IEEE802154_LIFS_PERIOD * phy->symbol_duration) / NSEC_PER_SEC; 161 phy->sifs_period = (IEEE802154_SIFS_PERIOD * phy->symbol_duration) / NSEC_PER_SEC; 162 } 163 EXPORT_SYMBOL(ieee802154_configure_durations); 164 165 void ieee802154_free_hw(struct ieee802154_hw *hw) 166 { 167 struct ieee802154_local *local = hw_to_local(hw); 168 169 BUG_ON(!list_empty(&local->interfaces)); 170 171 mutex_destroy(&local->iflist_mtx); 172 173 wpan_phy_free(local->phy); 174 } 175 EXPORT_SYMBOL(ieee802154_free_hw); 176 177 static void ieee802154_setup_wpan_phy_pib(struct wpan_phy *wpan_phy) 178 { 179 /* TODO warn on empty symbol_duration 180 * Should be done when all drivers sets this value. 181 */ 182 183 wpan_phy->lifs_period = 184 (IEEE802154_LIFS_PERIOD * wpan_phy->symbol_duration) / 1000; 185 wpan_phy->sifs_period = 186 (IEEE802154_SIFS_PERIOD * wpan_phy->symbol_duration) / 1000; 187 } 188 189 int ieee802154_register_hw(struct ieee802154_hw *hw) 190 { 191 struct ieee802154_local *local = hw_to_local(hw); 192 char mac_wq_name[IFNAMSIZ + 10] = {}; 193 struct net_device *dev; 194 int rc = -ENOSYS; 195 196 local->workqueue = 197 create_singlethread_workqueue(wpan_phy_name(local->phy)); 198 if (!local->workqueue) { 199 rc = -ENOMEM; 200 goto out; 201 } 202 203 snprintf(mac_wq_name, IFNAMSIZ + 10, "%s-mac-cmds", wpan_phy_name(local->phy)); 204 local->mac_wq = create_singlethread_workqueue(mac_wq_name); 205 if (!local->mac_wq) { 206 rc = -ENOMEM; 207 goto out_wq; 208 } 209 210 hrtimer_init(&local->ifs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 211 local->ifs_timer.function = ieee802154_xmit_ifs_timer; 212 213 wpan_phy_set_dev(local->phy, local->hw.parent); 214 215 ieee802154_setup_wpan_phy_pib(local->phy); 216 217 ieee802154_configure_durations(local->phy, local->phy->current_page, 218 local->phy->current_channel); 219 220 if (!(hw->flags & IEEE802154_HW_CSMA_PARAMS)) { 221 local->phy->supported.min_csma_backoffs = 4; 222 local->phy->supported.max_csma_backoffs = 4; 223 local->phy->supported.min_maxbe = 5; 224 local->phy->supported.max_maxbe = 5; 225 local->phy->supported.min_minbe = 3; 226 local->phy->supported.max_minbe = 3; 227 } 228 229 if (!(hw->flags & IEEE802154_HW_FRAME_RETRIES)) { 230 local->phy->supported.min_frame_retries = 3; 231 local->phy->supported.max_frame_retries = 3; 232 } 233 234 if (hw->flags & IEEE802154_HW_PROMISCUOUS) 235 local->phy->supported.iftypes |= BIT(NL802154_IFTYPE_MONITOR); 236 237 rc = wpan_phy_register(local->phy); 238 if (rc < 0) 239 goto out_mac_wq; 240 241 rtnl_lock(); 242 243 dev = ieee802154_if_add(local, "wpan%d", NET_NAME_ENUM, 244 NL802154_IFTYPE_NODE, 245 cpu_to_le64(0x0000000000000000ULL)); 246 if (IS_ERR(dev)) { 247 rtnl_unlock(); 248 rc = PTR_ERR(dev); 249 goto out_phy; 250 } 251 252 rtnl_unlock(); 253 254 return 0; 255 256 out_phy: 257 wpan_phy_unregister(local->phy); 258 out_mac_wq: 259 destroy_workqueue(local->mac_wq); 260 out_wq: 261 destroy_workqueue(local->workqueue); 262 out: 263 return rc; 264 } 265 EXPORT_SYMBOL(ieee802154_register_hw); 266 267 void ieee802154_unregister_hw(struct ieee802154_hw *hw) 268 { 269 struct ieee802154_local *local = hw_to_local(hw); 270 271 tasklet_kill(&local->tasklet); 272 flush_workqueue(local->workqueue); 273 274 rtnl_lock(); 275 276 ieee802154_remove_interfaces(local); 277 278 rtnl_unlock(); 279 280 destroy_workqueue(local->mac_wq); 281 destroy_workqueue(local->workqueue); 282 wpan_phy_unregister(local->phy); 283 } 284 EXPORT_SYMBOL(ieee802154_unregister_hw); 285 286 static int __init ieee802154_init(void) 287 { 288 return ieee802154_iface_init(); 289 } 290 291 static void __exit ieee802154_exit(void) 292 { 293 ieee802154_iface_exit(); 294 295 rcu_barrier(); 296 } 297 298 subsys_initcall(ieee802154_init); 299 module_exit(ieee802154_exit); 300 301 MODULE_DESCRIPTION("IEEE 802.15.4 subsystem"); 302 MODULE_LICENSE("GPL v2"); 303