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  * 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 <linux/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         return &local->hw;
 111 }
 112 EXPORT_SYMBOL(ieee802154_alloc_hw);
 113
 114 void ieee802154_free_hw(struct ieee802154_hw *hw)
 115 {
 116         struct ieee802154_local *local = hw_to_local(hw);
 117
 118         BUG_ON(!list_empty(&local->interfaces));
 119
 120         mutex_destroy(&local->iflist_mtx);
 121
 122         wpan_phy_free(local->phy);
 123 }
 124 EXPORT_SYMBOL(ieee802154_free_hw);
 125
 126 static void ieee802154_setup_wpan_phy_pib(struct wpan_phy *wpan_phy)
 127 {
 128         /* TODO warn on empty symbol_duration
 129          * Should be done when all drivers sets this value.
 130          */
 131
 132         wpan_phy->lifs_period = IEEE802154_LIFS_PERIOD *
 133                                 wpan_phy->symbol_duration;
 134         wpan_phy->sifs_period = IEEE802154_SIFS_PERIOD *
 135                                 wpan_phy->symbol_duration;
 136 }
 137
 138 int ieee802154_register_hw(struct ieee802154_hw *hw)
 139 {
 140         struct ieee802154_local *local = hw_to_local(hw);
 141         struct net_device *dev;
 142         int rc = -ENOSYS;
 143
 144         local->workqueue =
 145                 create_singlethread_workqueue(wpan_phy_name(local->phy));
 146         if (!local->workqueue) {
 147                 rc = -ENOMEM;
 148                 goto out;
 149         }
 150
 151         hrtimer_init(&local->ifs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 152         local->ifs_timer.function = ieee802154_xmit_ifs_timer;
 153
 154         wpan_phy_set_dev(local->phy, local->hw.parent);
 155
 156         ieee802154_setup_wpan_phy_pib(local->phy);
 157
 158         rc = wpan_phy_register(local->phy);
 159         if (rc < 0)
 160                 goto out_wq;
 161
 162         rtnl_lock();
 163
 164         dev = ieee802154_if_add(local, "wpan%d", NULL, IEEE802154_DEV_WPAN);
 165         if (IS_ERR(dev)) {
 166                 rtnl_unlock();
 167                 rc = PTR_ERR(dev);
 168                 goto out_wq;
 169         }
 170
 171         rtnl_unlock();
 172
 173         return 0;
 174
 175 out_wq:
 176         destroy_workqueue(local->workqueue);
 177 out:
 178         return rc;
 179 }
 180 EXPORT_SYMBOL(ieee802154_register_hw);
 181
 182 void ieee802154_unregister_hw(struct ieee802154_hw *hw)
 183 {
 184         struct ieee802154_local *local = hw_to_local(hw);
 185
 186         tasklet_kill(&local->tasklet);
 187         flush_workqueue(local->workqueue);
 188         destroy_workqueue(local->workqueue);
 189
 190         rtnl_lock();
 191
 192         ieee802154_remove_interfaces(local);
 193
 194         rtnl_unlock();
 195
 196         wpan_phy_unregister(local->phy);
 197 }
 198 EXPORT_SYMBOL(ieee802154_unregister_hw);
 199
 200 static int __init ieee802154_init(void)
 201 {
 202         return ieee802154_iface_init();
 203 }
 204
 205 static void __exit ieee802154_exit(void)
 206 {
 207         ieee802154_iface_exit();
 208
 209         rcu_barrier();
 210 }
 211
 212 subsys_initcall(ieee802154_init);
 213 module_exit(ieee802154_exit);
 214
 215 MODULE_DESCRIPTION("IEEE 802.15.4 subsystem");
 216 MODULE_LICENSE("GPL v2");