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
ieee802154_tasklet_handler(struct tasklet_struct * t)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 *
ieee802154_alloc_hw(size_t priv_data_len,const struct ieee802154_ops * ops)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
ieee802154_configure_durations(struct wpan_phy * phy)116 void ieee802154_configure_durations(struct wpan_phy *phy)
117 {
118 u32 duration = 0;
119
120 switch (phy->current_page) {
121 case 0:
122 if (BIT(phy->current_channel) & 0x1)
123 /* 868 MHz BPSK 802.15.4-2003: 20 ksym/s */
124 duration = 50 * NSEC_PER_USEC;
125 else if (BIT(phy->current_channel) & 0x7FE)
126 /* 915 MHz BPSK 802.15.4-2003: 40 ksym/s */
127 duration = 25 * NSEC_PER_USEC;
128 else if (BIT(phy->current_channel) & 0x7FFF800)
129 /* 2400 MHz O-QPSK 802.15.4-2006: 62.5 ksym/s */
130 duration = 16 * NSEC_PER_USEC;
131 break;
132 case 2:
133 if (BIT(phy->current_channel) & 0x1)
134 /* 868 MHz O-QPSK 802.15.4-2006: 25 ksym/s */
135 duration = 40 * NSEC_PER_USEC;
136 else if (BIT(phy->current_channel) & 0x7FE)
137 /* 915 MHz O-QPSK 802.15.4-2006: 62.5 ksym/s */
138 duration = 16 * NSEC_PER_USEC;
139 break;
140 case 3:
141 if (BIT(phy->current_channel) & 0x3FFF)
142 /* 2.4 GHz CSS 802.15.4a-2007: 1/6 Msym/s */
143 duration = 6 * NSEC_PER_USEC;
144 break;
145 default:
146 break;
147 }
148
149 if (!duration) {
150 pr_debug("Unknown PHY symbol duration\n");
151 return;
152 }
153
154 phy->symbol_duration = duration;
155 phy->lifs_period = (IEEE802154_LIFS_PERIOD * phy->symbol_duration) / NSEC_PER_SEC;
156 phy->sifs_period = (IEEE802154_SIFS_PERIOD * phy->symbol_duration) / NSEC_PER_SEC;
157 }
158 EXPORT_SYMBOL(ieee802154_configure_durations);
159
ieee802154_free_hw(struct ieee802154_hw * hw)160 void ieee802154_free_hw(struct ieee802154_hw *hw)
161 {
162 struct ieee802154_local *local = hw_to_local(hw);
163
164 BUG_ON(!list_empty(&local->interfaces));
165
166 mutex_destroy(&local->iflist_mtx);
167
168 wpan_phy_free(local->phy);
169 }
170 EXPORT_SYMBOL(ieee802154_free_hw);
171
ieee802154_setup_wpan_phy_pib(struct wpan_phy * wpan_phy)172 static void ieee802154_setup_wpan_phy_pib(struct wpan_phy *wpan_phy)
173 {
174 /* TODO warn on empty symbol_duration
175 * Should be done when all drivers sets this value.
176 */
177
178 wpan_phy->lifs_period =
179 (IEEE802154_LIFS_PERIOD * wpan_phy->symbol_duration) / 1000;
180 wpan_phy->sifs_period =
181 (IEEE802154_SIFS_PERIOD * wpan_phy->symbol_duration) / 1000;
182 }
183
ieee802154_register_hw(struct ieee802154_hw * hw)184 int ieee802154_register_hw(struct ieee802154_hw *hw)
185 {
186 struct ieee802154_local *local = hw_to_local(hw);
187 struct net_device *dev;
188 int rc = -ENOSYS;
189
190 local->workqueue =
191 create_singlethread_workqueue(wpan_phy_name(local->phy));
192 if (!local->workqueue) {
193 rc = -ENOMEM;
194 goto out;
195 }
196
197 hrtimer_init(&local->ifs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
198 local->ifs_timer.function = ieee802154_xmit_ifs_timer;
199
200 wpan_phy_set_dev(local->phy, local->hw.parent);
201
202 ieee802154_setup_wpan_phy_pib(local->phy);
203
204 ieee802154_configure_durations(local->phy);
205
206 if (!(hw->flags & IEEE802154_HW_CSMA_PARAMS)) {
207 local->phy->supported.min_csma_backoffs = 4;
208 local->phy->supported.max_csma_backoffs = 4;
209 local->phy->supported.min_maxbe = 5;
210 local->phy->supported.max_maxbe = 5;
211 local->phy->supported.min_minbe = 3;
212 local->phy->supported.max_minbe = 3;
213 }
214
215 if (!(hw->flags & IEEE802154_HW_FRAME_RETRIES)) {
216 local->phy->supported.min_frame_retries = 3;
217 local->phy->supported.max_frame_retries = 3;
218 }
219
220 if (hw->flags & IEEE802154_HW_PROMISCUOUS)
221 local->phy->supported.iftypes |= BIT(NL802154_IFTYPE_MONITOR);
222
223 rc = wpan_phy_register(local->phy);
224 if (rc < 0)
225 goto out_wq;
226
227 rtnl_lock();
228
229 dev = ieee802154_if_add(local, "wpan%d", NET_NAME_ENUM,
230 NL802154_IFTYPE_NODE,
231 cpu_to_le64(0x0000000000000000ULL));
232 if (IS_ERR(dev)) {
233 rtnl_unlock();
234 rc = PTR_ERR(dev);
235 goto out_phy;
236 }
237
238 rtnl_unlock();
239
240 return 0;
241
242 out_phy:
243 wpan_phy_unregister(local->phy);
244 out_wq:
245 destroy_workqueue(local->workqueue);
246 out:
247 return rc;
248 }
249 EXPORT_SYMBOL(ieee802154_register_hw);
250
ieee802154_unregister_hw(struct ieee802154_hw * hw)251 void ieee802154_unregister_hw(struct ieee802154_hw *hw)
252 {
253 struct ieee802154_local *local = hw_to_local(hw);
254
255 tasklet_kill(&local->tasklet);
256 flush_workqueue(local->workqueue);
257
258 rtnl_lock();
259
260 ieee802154_remove_interfaces(local);
261
262 rtnl_unlock();
263
264 destroy_workqueue(local->workqueue);
265 wpan_phy_unregister(local->phy);
266 }
267 EXPORT_SYMBOL(ieee802154_unregister_hw);
268
ieee802154_init(void)269 static int __init ieee802154_init(void)
270 {
271 return ieee802154_iface_init();
272 }
273
ieee802154_exit(void)274 static void __exit ieee802154_exit(void)
275 {
276 ieee802154_iface_exit();
277
278 rcu_barrier();
279 }
280
281 subsys_initcall(ieee802154_init);
282 module_exit(ieee802154_exit);
283
284 MODULE_DESCRIPTION("IEEE 802.15.4 subsystem");
285 MODULE_LICENSE("GPL v2");
286