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 INIT_LIST_HEAD(&local->rx_beacon_list);
93 INIT_LIST_HEAD(&local->rx_mac_cmd_list);
94 mutex_init(&local->iflist_mtx);
95
96 tasklet_setup(&local->tasklet, ieee802154_tasklet_handler);
97
98 skb_queue_head_init(&local->skb_queue);
99
100 INIT_WORK(&local->sync_tx_work, ieee802154_xmit_sync_worker);
101 INIT_DELAYED_WORK(&local->scan_work, mac802154_scan_worker);
102 INIT_WORK(&local->rx_beacon_work, mac802154_rx_beacon_worker);
103 INIT_DELAYED_WORK(&local->beacon_work, mac802154_beacon_worker);
104 INIT_WORK(&local->rx_mac_cmd_work, mac802154_rx_mac_cmd_worker);
105
106 /* init supported flags with 802.15.4 default ranges */
107 phy->supported.max_minbe = 8;
108 phy->supported.min_maxbe = 3;
109 phy->supported.max_maxbe = 8;
110 phy->supported.min_frame_retries = 0;
111 phy->supported.max_frame_retries = 7;
112 phy->supported.max_csma_backoffs = 5;
113 phy->supported.lbt = NL802154_SUPPORTED_BOOL_FALSE;
114
115 /* always supported */
116 phy->supported.iftypes = BIT(NL802154_IFTYPE_NODE) | BIT(NL802154_IFTYPE_COORD);
117
118 return &local->hw;
119 }
120 EXPORT_SYMBOL(ieee802154_alloc_hw);
121
ieee802154_configure_durations(struct wpan_phy * phy,unsigned int page,unsigned int channel)122 void ieee802154_configure_durations(struct wpan_phy *phy,
123 unsigned int page, unsigned int channel)
124 {
125 u32 duration = 0;
126
127 switch (page) {
128 case 0:
129 if (BIT(channel) & 0x1)
130 /* 868 MHz BPSK 802.15.4-2003: 20 ksym/s */
131 duration = 50 * NSEC_PER_USEC;
132 else if (BIT(channel) & 0x7FE)
133 /* 915 MHz BPSK 802.15.4-2003: 40 ksym/s */
134 duration = 25 * NSEC_PER_USEC;
135 else if (BIT(channel) & 0x7FFF800)
136 /* 2400 MHz O-QPSK 802.15.4-2006: 62.5 ksym/s */
137 duration = 16 * NSEC_PER_USEC;
138 break;
139 case 2:
140 if (BIT(channel) & 0x1)
141 /* 868 MHz O-QPSK 802.15.4-2006: 25 ksym/s */
142 duration = 40 * NSEC_PER_USEC;
143 else if (BIT(channel) & 0x7FE)
144 /* 915 MHz O-QPSK 802.15.4-2006: 62.5 ksym/s */
145 duration = 16 * NSEC_PER_USEC;
146 break;
147 case 3:
148 if (BIT(channel) & 0x3FFF)
149 /* 2.4 GHz CSS 802.15.4a-2007: 1/6 Msym/s */
150 duration = 6 * NSEC_PER_USEC;
151 break;
152 default:
153 break;
154 }
155
156 if (!duration) {
157 pr_debug("Unknown PHY symbol duration\n");
158 return;
159 }
160
161 phy->symbol_duration = duration;
162 phy->lifs_period =
163 (IEEE802154_LIFS_PERIOD * phy->symbol_duration) / NSEC_PER_USEC;
164 phy->sifs_period =
165 (IEEE802154_SIFS_PERIOD * phy->symbol_duration) / NSEC_PER_USEC;
166 }
167 EXPORT_SYMBOL(ieee802154_configure_durations);
168
ieee802154_free_hw(struct ieee802154_hw * hw)169 void ieee802154_free_hw(struct ieee802154_hw *hw)
170 {
171 struct ieee802154_local *local = hw_to_local(hw);
172
173 BUG_ON(!list_empty(&local->interfaces));
174
175 mutex_destroy(&local->iflist_mtx);
176
177 wpan_phy_free(local->phy);
178 }
179 EXPORT_SYMBOL(ieee802154_free_hw);
180
ieee802154_setup_wpan_phy_pib(struct wpan_phy * wpan_phy)181 static void ieee802154_setup_wpan_phy_pib(struct wpan_phy *wpan_phy)
182 {
183 /* TODO warn on empty symbol_duration
184 * Should be done when all drivers sets this value.
185 */
186
187 wpan_phy->lifs_period = (IEEE802154_LIFS_PERIOD *
188 wpan_phy->symbol_duration) / NSEC_PER_USEC;
189 wpan_phy->sifs_period = (IEEE802154_SIFS_PERIOD *
190 wpan_phy->symbol_duration) / NSEC_PER_USEC;
191 }
192
ieee802154_register_hw(struct ieee802154_hw * hw)193 int ieee802154_register_hw(struct ieee802154_hw *hw)
194 {
195 struct ieee802154_local *local = hw_to_local(hw);
196 char mac_wq_name[IFNAMSIZ + 10] = {};
197 struct net_device *dev;
198 int rc = -ENOSYS;
199
200 local->workqueue =
201 create_singlethread_workqueue(wpan_phy_name(local->phy));
202 if (!local->workqueue) {
203 rc = -ENOMEM;
204 goto out;
205 }
206
207 snprintf(mac_wq_name, IFNAMSIZ + 10, "%s-mac-cmds", wpan_phy_name(local->phy));
208 local->mac_wq = create_singlethread_workqueue(mac_wq_name);
209 if (!local->mac_wq) {
210 rc = -ENOMEM;
211 goto out_wq;
212 }
213
214 hrtimer_init(&local->ifs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
215 local->ifs_timer.function = ieee802154_xmit_ifs_timer;
216
217 wpan_phy_set_dev(local->phy, local->hw.parent);
218
219 ieee802154_setup_wpan_phy_pib(local->phy);
220
221 ieee802154_configure_durations(local->phy, local->phy->current_page,
222 local->phy->current_channel);
223
224 if (!(hw->flags & IEEE802154_HW_CSMA_PARAMS)) {
225 local->phy->supported.min_csma_backoffs = 4;
226 local->phy->supported.max_csma_backoffs = 4;
227 local->phy->supported.min_maxbe = 5;
228 local->phy->supported.max_maxbe = 5;
229 local->phy->supported.min_minbe = 3;
230 local->phy->supported.max_minbe = 3;
231 }
232
233 if (!(hw->flags & IEEE802154_HW_FRAME_RETRIES)) {
234 local->phy->supported.min_frame_retries = 3;
235 local->phy->supported.max_frame_retries = 3;
236 }
237
238 if (hw->flags & IEEE802154_HW_PROMISCUOUS)
239 local->phy->supported.iftypes |= BIT(NL802154_IFTYPE_MONITOR);
240
241 rc = wpan_phy_register(local->phy);
242 if (rc < 0)
243 goto out_mac_wq;
244
245 rtnl_lock();
246
247 dev = ieee802154_if_add(local, "wpan%d", NET_NAME_ENUM,
248 NL802154_IFTYPE_NODE,
249 cpu_to_le64(0x0000000000000000ULL));
250 if (IS_ERR(dev)) {
251 rtnl_unlock();
252 rc = PTR_ERR(dev);
253 goto out_phy;
254 }
255
256 rtnl_unlock();
257
258 return 0;
259
260 out_phy:
261 wpan_phy_unregister(local->phy);
262 out_mac_wq:
263 destroy_workqueue(local->mac_wq);
264 out_wq:
265 destroy_workqueue(local->workqueue);
266 out:
267 return rc;
268 }
269 EXPORT_SYMBOL(ieee802154_register_hw);
270
ieee802154_unregister_hw(struct ieee802154_hw * hw)271 void ieee802154_unregister_hw(struct ieee802154_hw *hw)
272 {
273 struct ieee802154_local *local = hw_to_local(hw);
274
275 tasklet_kill(&local->tasklet);
276 flush_workqueue(local->workqueue);
277
278 rtnl_lock();
279
280 ieee802154_remove_interfaces(local);
281
282 rtnl_unlock();
283
284 destroy_workqueue(local->mac_wq);
285 destroy_workqueue(local->workqueue);
286 wpan_phy_unregister(local->phy);
287 }
288 EXPORT_SYMBOL(ieee802154_unregister_hw);
289
ieee802154_init(void)290 static int __init ieee802154_init(void)
291 {
292 return ieee802154_iface_init();
293 }
294
ieee802154_exit(void)295 static void __exit ieee802154_exit(void)
296 {
297 ieee802154_iface_exit();
298
299 rcu_barrier();
300 }
301
302 subsys_initcall(ieee802154_init);
303 module_exit(ieee802154_exit);
304
305 MODULE_DESCRIPTION("IEEE 802.15.4 subsystem");
306 MODULE_LICENSE("GPL v2");
307