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 <[email protected]>
   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         INIT_LIST_HEAD(&local->rx_beacon_list);
  93         mutex_init(&local->iflist_mtx);
  94
  95         tasklet_setup(&local->tasklet, ieee802154_tasklet_handler);
  96
  97         skb_queue_head_init(&local->skb_queue);
  98
  99         INIT_WORK(&local->sync_tx_work, ieee802154_xmit_sync_worker);
 100         INIT_DELAYED_WORK(&local->scan_work, mac802154_scan_worker);
 101         INIT_WORK(&local->rx_beacon_work, mac802154_rx_beacon_worker);
 102         INIT_DELAYED_WORK(&local->beacon_work, mac802154_beacon_worker);
 103
 104         /* init supported flags with 802.15.4 default ranges */
 105         phy->supported.max_minbe = 8;
 106         phy->supported.min_maxbe = 3;
 107         phy->supported.max_maxbe = 8;
 108         phy->supported.min_frame_retries = 0;
 109         phy->supported.max_frame_retries = 7;
 110         phy->supported.max_csma_backoffs = 5;
 111         phy->supported.lbt = NL802154_SUPPORTED_BOOL_FALSE;
 112
 113         /* always supported */
 114         phy->supported.iftypes = BIT(NL802154_IFTYPE_NODE) | BIT(NL802154_IFTYPE_COORD);
 115
 116         return &local->hw;
 117 }
 118 EXPORT_SYMBOL(ieee802154_alloc_hw);
 119
 120 void ieee802154_configure_durations(struct wpan_phy *phy,
 121                                     unsigned int page, unsigned int channel)
 122 {
 123         u32 duration = 0;
 124
 125         switch (page) {
 126         case 0:
 127                 if (BIT(channel) & 0x1)
 128                         /* 868 MHz BPSK 802.15.4-2003: 20 ksym/s */
 129                         duration = 50 * NSEC_PER_USEC;
 130                 else if (BIT(channel) & 0x7FE)
 131                         /* 915 MHz BPSK 802.15.4-2003: 40 ksym/s */
 132                         duration = 25 * NSEC_PER_USEC;
 133                 else if (BIT(channel) & 0x7FFF800)
 134                         /* 2400 MHz O-QPSK 802.15.4-2006: 62.5 ksym/s */
 135                         duration = 16 * NSEC_PER_USEC;
 136                 break;
 137         case 2:
 138                 if (BIT(channel) & 0x1)
 139                         /* 868 MHz O-QPSK 802.15.4-2006: 25 ksym/s */
 140                         duration = 40 * NSEC_PER_USEC;
 141                 else if (BIT(channel) & 0x7FE)
 142                         /* 915 MHz O-QPSK 802.15.4-2006: 62.5 ksym/s */
 143                         duration = 16 * NSEC_PER_USEC;
 144                 break;
 145         case 3:
 146                 if (BIT(channel) & 0x3FFF)
 147                         /* 2.4 GHz CSS 802.15.4a-2007: 1/6 Msym/s */
 148                         duration = 6 * NSEC_PER_USEC;
 149                 break;
 150         default:
 151                 break;
 152         }
 153
 154         if (!duration) {
 155                 pr_debug("Unknown PHY symbol duration\n");
 156                 return;
 157         }
 158
 159         phy->symbol_duration = duration;
 160         phy->lifs_period = (IEEE802154_LIFS_PERIOD * phy->symbol_duration) / NSEC_PER_SEC;
 161         phy->sifs_period = (IEEE802154_SIFS_PERIOD * phy->symbol_duration) / NSEC_PER_SEC;
 162 }
 163 EXPORT_SYMBOL(ieee802154_configure_durations);
 164
 165 void ieee802154_free_hw(struct ieee802154_hw *hw)
 166 {
 167         struct ieee802154_local *local = hw_to_local(hw);
 168
 169         BUG_ON(!list_empty(&local->interfaces));
 170
 171         mutex_destroy(&local->iflist_mtx);
 172
 173         wpan_phy_free(local->phy);
 174 }
 175 EXPORT_SYMBOL(ieee802154_free_hw);
 176
 177 static void ieee802154_setup_wpan_phy_pib(struct wpan_phy *wpan_phy)
 178 {
 179         /* TODO warn on empty symbol_duration
 180          * Should be done when all drivers sets this value.
 181          */
 182
 183         wpan_phy->lifs_period =
 184                 (IEEE802154_LIFS_PERIOD * wpan_phy->symbol_duration) / 1000;
 185         wpan_phy->sifs_period =
 186                 (IEEE802154_SIFS_PERIOD * wpan_phy->symbol_duration) / 1000;
 187 }
 188
 189 int ieee802154_register_hw(struct ieee802154_hw *hw)
 190 {
 191         struct ieee802154_local *local = hw_to_local(hw);
 192         char mac_wq_name[IFNAMSIZ + 10] = {};
 193         struct net_device *dev;
 194         int rc = -ENOSYS;
 195
 196         local->workqueue =
 197                 create_singlethread_workqueue(wpan_phy_name(local->phy));
 198         if (!local->workqueue) {
 199                 rc = -ENOMEM;
 200                 goto out;
 201         }
 202
 203         snprintf(mac_wq_name, IFNAMSIZ + 10, "%s-mac-cmds", wpan_phy_name(local->phy));
 204         local->mac_wq = create_singlethread_workqueue(mac_wq_name);
 205         if (!local->mac_wq) {
 206                 rc = -ENOMEM;
 207                 goto out_wq;
 208         }
 209
 210         hrtimer_init(&local->ifs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 211         local->ifs_timer.function = ieee802154_xmit_ifs_timer;
 212
 213         wpan_phy_set_dev(local->phy, local->hw.parent);
 214
 215         ieee802154_setup_wpan_phy_pib(local->phy);
 216
 217         ieee802154_configure_durations(local->phy, local->phy->current_page,
 218                                        local->phy->current_channel);
 219
 220         if (!(hw->flags & IEEE802154_HW_CSMA_PARAMS)) {
 221                 local->phy->supported.min_csma_backoffs = 4;
 222                 local->phy->supported.max_csma_backoffs = 4;
 223                 local->phy->supported.min_maxbe = 5;
 224                 local->phy->supported.max_maxbe = 5;
 225                 local->phy->supported.min_minbe = 3;
 226                 local->phy->supported.max_minbe = 3;
 227         }
 228
 229         if (!(hw->flags & IEEE802154_HW_FRAME_RETRIES)) {
 230                 local->phy->supported.min_frame_retries = 3;
 231                 local->phy->supported.max_frame_retries = 3;
 232         }
 233
 234         if (hw->flags & IEEE802154_HW_PROMISCUOUS)
 235                 local->phy->supported.iftypes |= BIT(NL802154_IFTYPE_MONITOR);
 236
 237         rc = wpan_phy_register(local->phy);
 238         if (rc < 0)
 239                 goto out_mac_wq;
 240
 241         rtnl_lock();
 242
 243         dev = ieee802154_if_add(local, "wpan%d", NET_NAME_ENUM,
 244                                 NL802154_IFTYPE_NODE,
 245                                 cpu_to_le64(0x0000000000000000ULL));
 246         if (IS_ERR(dev)) {
 247                 rtnl_unlock();
 248                 rc = PTR_ERR(dev);
 249                 goto out_phy;
 250         }
 251
 252         rtnl_unlock();
 253
 254         return 0;
 255
 256 out_phy:
 257         wpan_phy_unregister(local->phy);
 258 out_mac_wq:
 259         destroy_workqueue(local->mac_wq);
 260 out_wq:
 261         destroy_workqueue(local->workqueue);
 262 out:
 263         return rc;
 264 }
 265 EXPORT_SYMBOL(ieee802154_register_hw);
 266
 267 void ieee802154_unregister_hw(struct ieee802154_hw *hw)
 268 {
 269         struct ieee802154_local *local = hw_to_local(hw);
 270
 271         tasklet_kill(&local->tasklet);
 272         flush_workqueue(local->workqueue);
 273
 274         rtnl_lock();
 275
 276         ieee802154_remove_interfaces(local);
 277
 278         rtnl_unlock();
 279
 280         destroy_workqueue(local->mac_wq);
 281         destroy_workqueue(local->workqueue);
 282         wpan_phy_unregister(local->phy);
 283 }
 284 EXPORT_SYMBOL(ieee802154_unregister_hw);
 285
 286 static int __init ieee802154_init(void)
 287 {
 288         return ieee802154_iface_init();
 289 }
 290
 291 static void __exit ieee802154_exit(void)
 292 {
 293         ieee802154_iface_exit();
 294
 295         rcu_barrier();
 296 }
 297
 298 subsys_initcall(ieee802154_init);
 299 module_exit(ieee802154_exit);
 300
 301 MODULE_DESCRIPTION("IEEE 802.15.4 subsystem");
 302 MODULE_LICENSE("GPL v2");