linux/net/mac802154/main.c
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   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
  23static 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
  46struct ieee802154_hw *
  47ieee802154_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}
 114EXPORT_SYMBOL(ieee802154_alloc_hw);
 115
 116void 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}
 126EXPORT_SYMBOL(ieee802154_free_hw);
 127
 128static 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
 140int 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
 196out_phy:
 197        wpan_phy_unregister(local->phy);
 198out_wq:
 199        destroy_workqueue(local->workqueue);
 200out:
 201        return rc;
 202}
 203EXPORT_SYMBOL(ieee802154_register_hw);
 204
 205void 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}
 221EXPORT_SYMBOL(ieee802154_unregister_hw);
 222
 223static int __init ieee802154_init(void)
 224{
 225        return ieee802154_iface_init();
 226}
 227
 228static void __exit ieee802154_exit(void)
 229{
 230        ieee802154_iface_exit();
 231
 232        rcu_barrier();
 233}
 234
 235subsys_initcall(ieee802154_init);
 236module_exit(ieee802154_exit);
 237
 238MODULE_DESCRIPTION("IEEE 802.15.4 subsystem");
 239MODULE_LICENSE("GPL v2");
 240