xref: /kernel/linux/linux-5.10/net/mac802154/main.c (revision 8c2ecf20) 
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(unsigned long data)
24{
25	struct ieee802154_local *local = (struct ieee802154_local *)data;
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_init(&local->tasklet,
95		     ieee802154_tasklet_handler,
96		     (unsigned long)local);
97
98	skb_queue_head_init(&local->skb_queue);
99
100	INIT_WORK(&local->tx_work, ieee802154_xmit_worker);
101
102	/* init supported flags with 802.15.4 default ranges */
103	phy->supported.max_minbe = 8;
104	phy->supported.min_maxbe = 3;
105	phy->supported.max_maxbe = 8;
106	phy->supported.min_frame_retries = 0;
107	phy->supported.max_frame_retries = 7;
108	phy->supported.max_csma_backoffs = 5;
109	phy->supported.lbt = NL802154_SUPPORTED_BOOL_FALSE;
110
111	/* always supported */
112	phy->supported.iftypes = BIT(NL802154_IFTYPE_NODE);
113
114	return &local->hw;
115}
116EXPORT_SYMBOL(ieee802154_alloc_hw);
117
118void ieee802154_free_hw(struct ieee802154_hw *hw)
119{
120	struct ieee802154_local *local = hw_to_local(hw);
121
122	BUG_ON(!list_empty(&local->interfaces));
123
124	mutex_destroy(&local->iflist_mtx);
125
126	wpan_phy_free(local->phy);
127}
128EXPORT_SYMBOL(ieee802154_free_hw);
129
130static void ieee802154_setup_wpan_phy_pib(struct wpan_phy *wpan_phy)
131{
132	/* TODO warn on empty symbol_duration
133	 * Should be done when all drivers sets this value.
134	 */
135
136	wpan_phy->lifs_period = IEEE802154_LIFS_PERIOD *
137				wpan_phy->symbol_duration;
138	wpan_phy->sifs_period = IEEE802154_SIFS_PERIOD *
139				wpan_phy->symbol_duration;
140}
141
142int ieee802154_register_hw(struct ieee802154_hw *hw)
143{
144	struct ieee802154_local *local = hw_to_local(hw);
145	struct net_device *dev;
146	int rc = -ENOSYS;
147
148	local->workqueue =
149		create_singlethread_workqueue(wpan_phy_name(local->phy));
150	if (!local->workqueue) {
151		rc = -ENOMEM;
152		goto out;
153	}
154
155	hrtimer_init(&local->ifs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
156	local->ifs_timer.function = ieee802154_xmit_ifs_timer;
157
158	wpan_phy_set_dev(local->phy, local->hw.parent);
159
160	ieee802154_setup_wpan_phy_pib(local->phy);
161
162	if (!(hw->flags & IEEE802154_HW_CSMA_PARAMS)) {
163		local->phy->supported.min_csma_backoffs = 4;
164		local->phy->supported.max_csma_backoffs = 4;
165		local->phy->supported.min_maxbe = 5;
166		local->phy->supported.max_maxbe = 5;
167		local->phy->supported.min_minbe = 3;
168		local->phy->supported.max_minbe = 3;
169	}
170
171	if (!(hw->flags & IEEE802154_HW_FRAME_RETRIES)) {
172		local->phy->supported.min_frame_retries = 3;
173		local->phy->supported.max_frame_retries = 3;
174	}
175
176	if (hw->flags & IEEE802154_HW_PROMISCUOUS)
177		local->phy->supported.iftypes |= BIT(NL802154_IFTYPE_MONITOR);
178
179	rc = wpan_phy_register(local->phy);
180	if (rc < 0)
181		goto out_wq;
182
183	rtnl_lock();
184
185	dev = ieee802154_if_add(local, "wpan%d", NET_NAME_ENUM,
186				NL802154_IFTYPE_NODE,
187				cpu_to_le64(0x0000000000000000ULL));
188	if (IS_ERR(dev)) {
189		rtnl_unlock();
190		rc = PTR_ERR(dev);
191		goto out_phy;
192	}
193
194	rtnl_unlock();
195
196	return 0;
197
198out_phy:
199	wpan_phy_unregister(local->phy);
200out_wq:
201	destroy_workqueue(local->workqueue);
202out:
203	return rc;
204}
205EXPORT_SYMBOL(ieee802154_register_hw);
206
207void ieee802154_unregister_hw(struct ieee802154_hw *hw)
208{
209	struct ieee802154_local *local = hw_to_local(hw);
210
211	tasklet_kill(&local->tasklet);
212	flush_workqueue(local->workqueue);
213
214	rtnl_lock();
215
216	ieee802154_remove_interfaces(local);
217
218	rtnl_unlock();
219
220	destroy_workqueue(local->workqueue);
221	wpan_phy_unregister(local->phy);
222}
223EXPORT_SYMBOL(ieee802154_unregister_hw);
224
225static int __init ieee802154_init(void)
226{
227	return ieee802154_iface_init();
228}
229
230static void __exit ieee802154_exit(void)
231{
232	ieee802154_iface_exit();
233
234	rcu_barrier();
235}
236
237subsys_initcall(ieee802154_init);
238module_exit(ieee802154_exit);
239
240MODULE_DESCRIPTION("IEEE 802.15.4 subsystem");
241MODULE_LICENSE("GPL v2");
242