1 /* 2 * Copyright (C) 2007-2012 Siemens AG 3 * 4 * Written by: 5 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 9 * as published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 */ 16 17 #include <linux/kernel.h> 18 #include <linux/module.h> 19 #include <linux/netdevice.h> 20 21 #include <net/netlink.h> 22 #include <net/nl802154.h> 23 #include <net/mac802154.h> 24 #include <net/ieee802154_netdev.h> 25 #include <net/route.h> 26 #include <net/cfg802154.h> 27 28 #include "ieee802154_i.h" 29 #include "cfg.h" 30 31 static void ieee802154_tasklet_handler(unsigned long data) 32 { 33 struct ieee802154_local *local = (struct ieee802154_local *)data; 34 struct sk_buff *skb; 35 36 while ((skb = skb_dequeue(&local->skb_queue))) { 37 switch (skb->pkt_type) { 38 case IEEE802154_RX_MSG: 39 /* Clear skb->pkt_type in order to not confuse kernel 40 * netstack. 41 */ 42 skb->pkt_type = 0; 43 ieee802154_rx(&local->hw, skb); 44 break; 45 default: 46 WARN(1, "mac802154: Packet is of unknown type %d\n", 47 skb->pkt_type); 48 kfree_skb(skb); 49 break; 50 } 51 } 52 } 53 54 struct ieee802154_hw * 55 ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops) 56 { 57 struct wpan_phy *phy; 58 struct ieee802154_local *local; 59 size_t priv_size; 60 61 if (!ops || !(ops->xmit_async || ops->xmit_sync) || !ops->ed || 62 !ops->start || !ops->stop || !ops->set_channel) { 63 pr_err("undefined IEEE802.15.4 device operations\n"); 64 return NULL; 65 } 66 67 /* Ensure 32-byte alignment of our private data and hw private data. 68 * We use the wpan_phy priv data for both our ieee802154_local and for 69 * the driver's private data 70 * 71 * in memory it'll be like this: 72 * 73 * +-------------------------+ 74 * | struct wpan_phy | 75 * +-------------------------+ 76 * | struct ieee802154_local | 77 * +-------------------------+ 78 * | driver's private data | 79 * +-------------------------+ 80 * 81 * Due to ieee802154 layer isn't aware of driver and MAC structures, 82 * so lets align them here. 83 */ 84 85 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len; 86 87 phy = wpan_phy_new(&mac802154_config_ops, priv_size); 88 if (!phy) { 89 pr_err("failure to allocate master IEEE802.15.4 device\n"); 90 return NULL; 91 } 92 93 phy->privid = mac802154_wpan_phy_privid; 94 95 local = wpan_phy_priv(phy); 96 local->phy = phy; 97 local->hw.phy = local->phy; 98 local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN); 99 local->ops = ops; 100 101 INIT_LIST_HEAD(&local->interfaces); 102 mutex_init(&local->iflist_mtx); 103 104 tasklet_init(&local->tasklet, 105 ieee802154_tasklet_handler, 106 (unsigned long)local); 107 108 skb_queue_head_init(&local->skb_queue); 109 110 /* init supported flags with 802.15.4 default ranges */ 111 phy->supported.max_minbe = 8; 112 phy->supported.min_maxbe = 3; 113 phy->supported.max_maxbe = 8; 114 phy->supported.min_frame_retries = -1; 115 phy->supported.max_frame_retries = 7; 116 phy->supported.max_csma_backoffs = 5; 117 phy->supported.lbt = NL802154_SUPPORTED_BOOL_FALSE; 118 119 /* always supported */ 120 phy->supported.iftypes = BIT(NL802154_IFTYPE_NODE); 121 122 return &local->hw; 123 } 124 EXPORT_SYMBOL(ieee802154_alloc_hw); 125 126 void ieee802154_free_hw(struct ieee802154_hw *hw) 127 { 128 struct ieee802154_local *local = hw_to_local(hw); 129 130 BUG_ON(!list_empty(&local->interfaces)); 131 132 mutex_destroy(&local->iflist_mtx); 133 134 wpan_phy_free(local->phy); 135 } 136 EXPORT_SYMBOL(ieee802154_free_hw); 137 138 static void ieee802154_setup_wpan_phy_pib(struct wpan_phy *wpan_phy) 139 { 140 /* TODO warn on empty symbol_duration 141 * Should be done when all drivers sets this value. 142 */ 143 144 wpan_phy->lifs_period = IEEE802154_LIFS_PERIOD * 145 wpan_phy->symbol_duration; 146 wpan_phy->sifs_period = IEEE802154_SIFS_PERIOD * 147 wpan_phy->symbol_duration; 148 } 149 150 int ieee802154_register_hw(struct ieee802154_hw *hw) 151 { 152 struct ieee802154_local *local = hw_to_local(hw); 153 struct net_device *dev; 154 int rc = -ENOSYS; 155 156 local->workqueue = 157 create_singlethread_workqueue(wpan_phy_name(local->phy)); 158 if (!local->workqueue) { 159 rc = -ENOMEM; 160 goto out; 161 } 162 163 hrtimer_init(&local->ifs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 164 local->ifs_timer.function = ieee802154_xmit_ifs_timer; 165 166 wpan_phy_set_dev(local->phy, local->hw.parent); 167 168 ieee802154_setup_wpan_phy_pib(local->phy); 169 170 if (!(hw->flags & IEEE802154_HW_CSMA_PARAMS)) { 171 local->phy->supported.min_csma_backoffs = 4; 172 local->phy->supported.max_csma_backoffs = 4; 173 local->phy->supported.min_maxbe = 5; 174 local->phy->supported.max_maxbe = 5; 175 local->phy->supported.min_minbe = 3; 176 local->phy->supported.max_minbe = 3; 177 } 178 179 if (!(hw->flags & IEEE802154_HW_FRAME_RETRIES)) { 180 /* TODO should be 3, but our default value is -1 which means 181 * no ARET handling. 182 */ 183 local->phy->supported.min_frame_retries = -1; 184 local->phy->supported.max_frame_retries = -1; 185 } 186 187 if (hw->flags & IEEE802154_HW_PROMISCUOUS) 188 local->phy->supported.iftypes |= BIT(NL802154_IFTYPE_MONITOR); 189 190 rc = wpan_phy_register(local->phy); 191 if (rc < 0) 192 goto out_wq; 193 194 rtnl_lock(); 195 196 dev = ieee802154_if_add(local, "wpan%d", NET_NAME_ENUM, 197 NL802154_IFTYPE_NODE, 198 cpu_to_le64(0x0000000000000000ULL)); 199 if (IS_ERR(dev)) { 200 rtnl_unlock(); 201 rc = PTR_ERR(dev); 202 goto out_phy; 203 } 204 205 rtnl_unlock(); 206 207 return 0; 208 209 out_phy: 210 wpan_phy_unregister(local->phy); 211 out_wq: 212 destroy_workqueue(local->workqueue); 213 out: 214 return rc; 215 } 216 EXPORT_SYMBOL(ieee802154_register_hw); 217 218 void ieee802154_unregister_hw(struct ieee802154_hw *hw) 219 { 220 struct ieee802154_local *local = hw_to_local(hw); 221 222 tasklet_kill(&local->tasklet); 223 flush_workqueue(local->workqueue); 224 destroy_workqueue(local->workqueue); 225 226 rtnl_lock(); 227 228 ieee802154_remove_interfaces(local); 229 230 rtnl_unlock(); 231 232 wpan_phy_unregister(local->phy); 233 } 234 EXPORT_SYMBOL(ieee802154_unregister_hw); 235 236 static int __init ieee802154_init(void) 237 { 238 return ieee802154_iface_init(); 239 } 240 241 static void __exit ieee802154_exit(void) 242 { 243 ieee802154_iface_exit(); 244 245 rcu_barrier(); 246 } 247 248 subsys_initcall(ieee802154_init); 249 module_exit(ieee802154_exit); 250 251 MODULE_DESCRIPTION("IEEE 802.15.4 subsystem"); 252 MODULE_LICENSE("GPL v2"); 253