net/mac802154/main.c

   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         mutex_init(&local->iflist_mtx);
  93
  94         tasklet_setup(&local->tasklet, ieee802154_tasklet_handler);
  95
  96         skb_queue_head_init(&local->skb_queue);
  97
  98         INIT_WORK(&local->tx_work, ieee802154_xmit_worker);
  99
 100         /* init supported flags with 802.15.4 default ranges */
 101         phy->supported.max_minbe = 8;
 102         phy->supported.min_maxbe = 3;
 103         phy->supported.max_maxbe = 8;
 104         phy->supported.min_frame_retries = 0;
 105         phy->supported.max_frame_retries = 7;
 106         phy->supported.max_csma_backoffs = 5;
 107         phy->supported.lbt = NL802154_SUPPORTED_BOOL_FALSE;
 108
 109         /* always supported */
 110         phy->supported.iftypes = BIT(NL802154_IFTYPE_NODE);
 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         if (!(hw->flags & IEEE802154_HW_CSMA_PARAMS)) {
 161                 local->phy->supported.min_csma_backoffs = 4;
 162                 local->phy->supported.max_csma_backoffs = 4;
 163                 local->phy->supported.min_maxbe = 5;
 164                 local->phy->supported.max_maxbe = 5;
 165                 local->phy->supported.min_minbe = 3;
 166                 local->phy->supported.max_minbe = 3;
 167         }
 168
 169         if (!(hw->flags & IEEE802154_HW_FRAME_RETRIES)) {
 170                 local->phy->supported.min_frame_retries = 3;
 171                 local->phy->supported.max_frame_retries = 3;
 172         }
 173
 174         if (hw->flags & IEEE802154_HW_PROMISCUOUS)
 175                 local->phy->supported.iftypes |= BIT(NL802154_IFTYPE_MONITOR);
 176
 177         rc = wpan_phy_register(local->phy);
 178         if (rc < 0)
 179                 goto out_wq;
 180
 181         rtnl_lock();
 182
 183         dev = ieee802154_if_add(local, "wpan%d", NET_NAME_ENUM,
 184                                 NL802154_IFTYPE_NODE,
 185                                 cpu_to_le64(0x0000000000000000ULL));
 186         if (IS_ERR(dev)) {
 187                 rtnl_unlock();
 188                 rc = PTR_ERR(dev);
 189                 goto out_phy;
 190         }
 191
 192         rtnl_unlock();
 193
 194         return 0;
 195
 196 out_phy:
 197         wpan_phy_unregister(local->phy);
 198 out_wq:
 199         destroy_workqueue(local->workqueue);
 200 out:
 201         return rc;
 202 }
 203 EXPORT_SYMBOL(ieee802154_register_hw);
 204
 205 void ieee802154_unregister_hw(struct ieee802154_hw *hw)
 206 {
 207         struct ieee802154_local *local = hw_to_local(hw);
 208
 209         tasklet_kill(&local->tasklet);
 210         flush_workqueue(local->workqueue);
 211
 212         rtnl_lock();
 213
 214         ieee802154_remove_interfaces(local);
 215
 216         rtnl_unlock();
 217
 218         destroy_workqueue(local->workqueue);
 219         wpan_phy_unregister(local->phy);
 220 }
 221 EXPORT_SYMBOL(ieee802154_unregister_hw);
 222
 223 static int __init ieee802154_init(void)
 224 {
 225         return ieee802154_iface_init();
 226 }
 227
 228 static void __exit ieee802154_exit(void)
 229 {
 230         ieee802154_iface_exit();
 231
 232         rcu_barrier();
 233 }
 234
 235 subsys_initcall(ieee802154_init);
 236 module_exit(ieee802154_exit);
 237
 238 MODULE_DESCRIPTION("IEEE 802.15.4 subsystem");
 239 MODULE_LICENSE("GPL v2");