xref: /linux/net/mac802154/main.c (revision 987b741c52c7c6c68d46fbaeb95b8d1087f10b7f)
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");
240