net/mac802154/main.c

   1 /*
   2  * Copyright (C) 2007-2012 Siemens AG
   3  *
   4  * Written by:
   5  * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
   6  *
   7  * Based on the code from 'linux-zigbee.sourceforge.net' project.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2
  11  * as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/netdevice.h>
  22
  23 #include <net/netlink.h>
  24 #include <linux/nl802154.h>
  25 #include <net/mac802154.h>
  26 #include <net/ieee802154_netdev.h>
  27 #include <net/route.h>
  28 #include <net/cfg802154.h>
  29
  30 #include "ieee802154_i.h"
  31 #include "cfg.h"
  32
  33 static void ieee802154_tasklet_handler(unsigned long data)
  34 {
  35         struct ieee802154_local *local = (struct ieee802154_local *)data;
  36         struct sk_buff *skb;
  37
  38         while ((skb = skb_dequeue(&local->skb_queue))) {
  39                 switch (skb->pkt_type) {
  40                 case IEEE802154_RX_MSG:
  41                         /* Clear skb->pkt_type in order to not confuse kernel
  42                          * netstack.
  43                          */
  44                         skb->pkt_type = 0;
  45                         ieee802154_rx(&local->hw, skb);
  46                         break;
  47                 default:
  48                         WARN(1, "mac802154: Packet is of unknown type %d\n",
  49                              skb->pkt_type);
  50                         kfree_skb(skb);
  51                         break;
  52                 }
  53         }
  54 }
  55
  56 struct ieee802154_hw *
  57 ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops)
  58 {
  59         struct wpan_phy *phy;
  60         struct ieee802154_local *local;
  61         size_t priv_size;
  62
  63         if (!ops || !(ops->xmit_async || ops->xmit_sync) || !ops->ed ||
  64             !ops->start || !ops->stop || !ops->set_channel) {
  65                 pr_err("undefined IEEE802.15.4 device operations\n");
  66                 return NULL;
  67         }
  68
  69         /* Ensure 32-byte alignment of our private data and hw private data.
  70          * We use the wpan_phy priv data for both our ieee802154_local and for
  71          * the driver's private data
  72          *
  73          * in memory it'll be like this:
  74          *
  75          * +-------------------------+
  76          * | struct wpan_phy         |
  77          * +-------------------------+
  78          * | struct ieee802154_local |
  79          * +-------------------------+
  80          * | driver's private data   |
  81          * +-------------------------+
  82          *
  83          * Due to ieee802154 layer isn't aware of driver and MAC structures,
  84          * so lets align them here.
  85          */
  86
  87         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
  88
  89         phy = wpan_phy_new(&mac802154_config_ops, priv_size);
  90         if (!phy) {
  91                 pr_err("failure to allocate master IEEE802.15.4 device\n");
  92                 return NULL;
  93         }
  94
  95         phy->privid = mac802154_wpan_phy_privid;
  96
  97         local = wpan_phy_priv(phy);
  98         local->phy = phy;
  99         local->hw.phy = local->phy;
 100         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 101         local->ops = ops;
 102
 103         INIT_LIST_HEAD(&local->interfaces);
 104         mutex_init(&local->iflist_mtx);
 105
 106         tasklet_init(&local->tasklet,
 107                      ieee802154_tasklet_handler,
 108                      (unsigned long)local);
 109
 110         skb_queue_head_init(&local->skb_queue);
 111
 112         return &local->hw;
 113 }
 114 EXPORT_SYMBOL(ieee802154_alloc_hw);
 115
 116 void ieee802154_free_hw(struct ieee802154_hw *hw)
 117 {
 118         struct ieee802154_local *local = hw_to_local(hw);
 119
 120         BUG_ON(!list_empty(&local->interfaces));
 121
 122         mutex_destroy(&local->iflist_mtx);
 123
 124         wpan_phy_free(local->phy);
 125 }
 126 EXPORT_SYMBOL(ieee802154_free_hw);
 127
 128 static void ieee802154_setup_wpan_phy_pib(struct wpan_phy *wpan_phy)
 129 {
 130         /* TODO warn on empty symbol_duration
 131          * Should be done when all drivers sets this value.
 132          */
 133
 134         wpan_phy->lifs_period = IEEE802154_LIFS_PERIOD *
 135                                 wpan_phy->symbol_duration;
 136         wpan_phy->sifs_period = IEEE802154_SIFS_PERIOD *
 137                                 wpan_phy->symbol_duration;
 138 }
 139
 140 int ieee802154_register_hw(struct ieee802154_hw *hw)
 141 {
 142         struct ieee802154_local *local = hw_to_local(hw);
 143         struct net_device *dev;
 144         int rc = -ENOSYS;
 145
 146         local->workqueue =
 147                 create_singlethread_workqueue(wpan_phy_name(local->phy));
 148         if (!local->workqueue) {
 149                 rc = -ENOMEM;
 150                 goto out;
 151         }
 152
 153         hrtimer_init(&local->ifs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 154         local->ifs_timer.function = ieee802154_xmit_ifs_timer;
 155
 156         wpan_phy_set_dev(local->phy, local->hw.parent);
 157
 158         ieee802154_setup_wpan_phy_pib(local->phy);
 159
 160         rc = wpan_phy_register(local->phy);
 161         if (rc < 0)
 162                 goto out_wq;
 163
 164         rtnl_lock();
 165
 166         dev = ieee802154_if_add(local, "wpan%d", NULL, IEEE802154_DEV_WPAN);
 167         if (IS_ERR(dev)) {
 168                 rtnl_unlock();
 169                 rc = PTR_ERR(dev);
 170                 goto out_wq;
 171         }
 172
 173         rtnl_unlock();
 174
 175         return 0;
 176
 177 out_wq:
 178         destroy_workqueue(local->workqueue);
 179 out:
 180         return rc;
 181 }
 182 EXPORT_SYMBOL(ieee802154_register_hw);
 183
 184 void ieee802154_unregister_hw(struct ieee802154_hw *hw)
 185 {
 186         struct ieee802154_local *local = hw_to_local(hw);
 187
 188         tasklet_kill(&local->tasklet);
 189         flush_workqueue(local->workqueue);
 190         destroy_workqueue(local->workqueue);
 191
 192         rtnl_lock();
 193
 194         ieee802154_remove_interfaces(local);
 195
 196         rtnl_unlock();
 197
 198         wpan_phy_unregister(local->phy);
 199 }
 200 EXPORT_SYMBOL(ieee802154_unregister_hw);
 201
 202 static int __init ieee802154_init(void)
 203 {
 204         return ieee802154_iface_init();
 205 }
 206
 207 static void __exit ieee802154_exit(void)
 208 {
 209         ieee802154_iface_exit();
 210
 211         rcu_barrier();
 212 }
 213
 214 subsys_initcall(ieee802154_init);
 215 module_exit(ieee802154_exit);
 216
 217 MODULE_DESCRIPTION("IEEE 802.15.4 subsystem");
 218 MODULE_LICENSE("GPL v2");