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(unsigned long data) 24 { 25 struct ieee802154_local *local = (struct ieee802154_local *)data; 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 mutex_init(&local->iflist_mtx); 93 94 tasklet_init(&local->tasklet, 95 ieee802154_tasklet_handler, 96 (unsigned long)local); 97 98 skb_queue_head_init(&local->skb_queue); 99 100 INIT_WORK(&local->tx_work, ieee802154_xmit_worker); 101 102 /* init supported flags with 802.15.4 default ranges */ 103 phy->supported.max_minbe = 8; 104 phy->supported.min_maxbe = 3; 105 phy->supported.max_maxbe = 8; 106 phy->supported.min_frame_retries = 0; 107 phy->supported.max_frame_retries = 7; 108 phy->supported.max_csma_backoffs = 5; 109 phy->supported.lbt = NL802154_SUPPORTED_BOOL_FALSE; 110 111 /* always supported */ 112 phy->supported.iftypes = BIT(NL802154_IFTYPE_NODE); 113 114 return &local->hw; 115 } 116 EXPORT_SYMBOL(ieee802154_alloc_hw); 117 118 void ieee802154_free_hw(struct ieee802154_hw *hw) 119 { 120 struct ieee802154_local *local = hw_to_local(hw); 121 122 BUG_ON(!list_empty(&local->interfaces)); 123 124 mutex_destroy(&local->iflist_mtx); 125 126 wpan_phy_free(local->phy); 127 } 128 EXPORT_SYMBOL(ieee802154_free_hw); 129 130 static void ieee802154_setup_wpan_phy_pib(struct wpan_phy *wpan_phy) 131 { 132 /* TODO warn on empty symbol_duration 133 * Should be done when all drivers sets this value. 134 */ 135 136 wpan_phy->lifs_period = IEEE802154_LIFS_PERIOD * 137 wpan_phy->symbol_duration; 138 wpan_phy->sifs_period = IEEE802154_SIFS_PERIOD * 139 wpan_phy->symbol_duration; 140 } 141 142 int ieee802154_register_hw(struct ieee802154_hw *hw) 143 { 144 struct ieee802154_local *local = hw_to_local(hw); 145 struct net_device *dev; 146 int rc = -ENOSYS; 147 148 local->workqueue = 149 create_singlethread_workqueue(wpan_phy_name(local->phy)); 150 if (!local->workqueue) { 151 rc = -ENOMEM; 152 goto out; 153 } 154 155 hrtimer_init(&local->ifs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 156 local->ifs_timer.function = ieee802154_xmit_ifs_timer; 157 158 wpan_phy_set_dev(local->phy, local->hw.parent); 159 160 ieee802154_setup_wpan_phy_pib(local->phy); 161 162 if (!(hw->flags & IEEE802154_HW_CSMA_PARAMS)) { 163 local->phy->supported.min_csma_backoffs = 4; 164 local->phy->supported.max_csma_backoffs = 4; 165 local->phy->supported.min_maxbe = 5; 166 local->phy->supported.max_maxbe = 5; 167 local->phy->supported.min_minbe = 3; 168 local->phy->supported.max_minbe = 3; 169 } 170 171 if (!(hw->flags & IEEE802154_HW_FRAME_RETRIES)) { 172 local->phy->supported.min_frame_retries = 3; 173 local->phy->supported.max_frame_retries = 3; 174 } 175 176 if (hw->flags & IEEE802154_HW_PROMISCUOUS) 177 local->phy->supported.iftypes |= BIT(NL802154_IFTYPE_MONITOR); 178 179 rc = wpan_phy_register(local->phy); 180 if (rc < 0) 181 goto out_wq; 182 183 rtnl_lock(); 184 185 dev = ieee802154_if_add(local, "wpan%d", NET_NAME_ENUM, 186 NL802154_IFTYPE_NODE, 187 cpu_to_le64(0x0000000000000000ULL)); 188 if (IS_ERR(dev)) { 189 rtnl_unlock(); 190 rc = PTR_ERR(dev); 191 goto out_phy; 192 } 193 194 rtnl_unlock(); 195 196 return 0; 197 198 out_phy: 199 wpan_phy_unregister(local->phy); 200 out_wq: 201 destroy_workqueue(local->workqueue); 202 out: 203 return rc; 204 } 205 EXPORT_SYMBOL(ieee802154_register_hw); 206 207 void ieee802154_unregister_hw(struct ieee802154_hw *hw) 208 { 209 struct ieee802154_local *local = hw_to_local(hw); 210 211 tasklet_kill(&local->tasklet); 212 flush_workqueue(local->workqueue); 213 214 rtnl_lock(); 215 216 ieee802154_remove_interfaces(local); 217 218 rtnl_unlock(); 219 220 destroy_workqueue(local->workqueue); 221 wpan_phy_unregister(local->phy); 222 } 223 EXPORT_SYMBOL(ieee802154_unregister_hw); 224 225 static int __init ieee802154_init(void) 226 { 227 return ieee802154_iface_init(); 228 } 229 230 static void __exit ieee802154_exit(void) 231 { 232 ieee802154_iface_exit(); 233 234 rcu_barrier(); 235 } 236 237 subsys_initcall(ieee802154_init); 238 module_exit(ieee802154_exit); 239 240 MODULE_DESCRIPTION("IEEE 802.15.4 subsystem"); 241 MODULE_LICENSE("GPL v2"); 242