Merge tag 'iommu-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
[linux/fpc-iii.git] / net / mac802154 / main.c
blob520cedc594e1e4f8ba4b89b6b57e7e52787dad50
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2007-2012 Siemens AG
5 * Written by:
6 * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
7 */
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/netdevice.h>
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>
20 #include "ieee802154_i.h"
21 #include "cfg.h"
23 static void ieee802154_tasklet_handler(struct tasklet_struct *t)
25 struct ieee802154_local *local = from_tasklet(local, t, tasklet);
26 struct sk_buff *skb;
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.
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;
46 struct ieee802154_hw *
47 ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops)
49 struct wpan_phy *phy;
50 struct ieee802154_local *local;
51 size_t priv_size;
53 if (WARN_ON(!ops || !(ops->xmit_async || ops->xmit_sync) || !ops->ed ||
54 !ops->start || !ops->stop || !ops->set_channel))
55 return NULL;
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
61 * in memory it'll be like this:
63 * +-------------------------+
64 * | struct wpan_phy |
65 * +-------------------------+
66 * | struct ieee802154_local |
67 * +-------------------------+
68 * | driver's private data |
69 * +-------------------------+
71 * Due to ieee802154 layer isn't aware of driver and MAC structures,
72 * so lets align them here.
75 priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
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;
83 phy->privid = mac802154_wpan_phy_privid;
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;
91 INIT_LIST_HEAD(&local->interfaces);
92 mutex_init(&local->iflist_mtx);
94 tasklet_setup(&local->tasklet, ieee802154_tasklet_handler);
96 skb_queue_head_init(&local->skb_queue);
98 INIT_WORK(&local->tx_work, ieee802154_xmit_worker);
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;
109 /* always supported */
110 phy->supported.iftypes = BIT(NL802154_IFTYPE_NODE);
112 return &local->hw;
114 EXPORT_SYMBOL(ieee802154_alloc_hw);
116 void ieee802154_free_hw(struct ieee802154_hw *hw)
118 struct ieee802154_local *local = hw_to_local(hw);
120 BUG_ON(!list_empty(&local->interfaces));
122 mutex_destroy(&local->iflist_mtx);
124 wpan_phy_free(local->phy);
126 EXPORT_SYMBOL(ieee802154_free_hw);
128 static void ieee802154_setup_wpan_phy_pib(struct wpan_phy *wpan_phy)
130 /* TODO warn on empty symbol_duration
131 * Should be done when all drivers sets this value.
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;
140 int ieee802154_register_hw(struct ieee802154_hw *hw)
142 struct ieee802154_local *local = hw_to_local(hw);
143 struct net_device *dev;
144 int rc = -ENOSYS;
146 local->workqueue =
147 create_singlethread_workqueue(wpan_phy_name(local->phy));
148 if (!local->workqueue) {
149 rc = -ENOMEM;
150 goto out;
153 hrtimer_init(&local->ifs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
154 local->ifs_timer.function = ieee802154_xmit_ifs_timer;
156 wpan_phy_set_dev(local->phy, local->hw.parent);
158 ieee802154_setup_wpan_phy_pib(local->phy);
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;
169 if (!(hw->flags & IEEE802154_HW_FRAME_RETRIES)) {
170 local->phy->supported.min_frame_retries = 3;
171 local->phy->supported.max_frame_retries = 3;
174 if (hw->flags & IEEE802154_HW_PROMISCUOUS)
175 local->phy->supported.iftypes |= BIT(NL802154_IFTYPE_MONITOR);
177 rc = wpan_phy_register(local->phy);
178 if (rc < 0)
179 goto out_wq;
181 rtnl_lock();
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;
192 rtnl_unlock();
194 return 0;
196 out_phy:
197 wpan_phy_unregister(local->phy);
198 out_wq:
199 destroy_workqueue(local->workqueue);
200 out:
201 return rc;
203 EXPORT_SYMBOL(ieee802154_register_hw);
205 void ieee802154_unregister_hw(struct ieee802154_hw *hw)
207 struct ieee802154_local *local = hw_to_local(hw);
209 tasklet_kill(&local->tasklet);
210 flush_workqueue(local->workqueue);
212 rtnl_lock();
214 ieee802154_remove_interfaces(local);
216 rtnl_unlock();
218 destroy_workqueue(local->workqueue);
219 wpan_phy_unregister(local->phy);
221 EXPORT_SYMBOL(ieee802154_unregister_hw);
223 static int __init ieee802154_init(void)
225 return ieee802154_iface_init();
228 static void __exit ieee802154_exit(void)
230 ieee802154_iface_exit();
232 rcu_barrier();
235 subsys_initcall(ieee802154_init);
236 module_exit(ieee802154_exit);
238 MODULE_DESCRIPTION("IEEE 802.15.4 subsystem");
239 MODULE_LICENSE("GPL v2");