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1 | /* | |
2 | * Copyright (C) 2007-2012 Siemens AG | |
3 | * | |
4 | * Written by: | |
5 | * Alexander Smirnov <alex.bluesman.smirnov@gmail.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 | |
9 | * as published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | */ | |
16 | ||
17 | #include <linux/kernel.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/netdevice.h> | |
20 | ||
21 | #include <net/netlink.h> | |
22 | #include <net/nl802154.h> | |
23 | #include <net/mac802154.h> | |
24 | #include <net/ieee802154_netdev.h> | |
25 | #include <net/route.h> | |
26 | #include <net/cfg802154.h> | |
27 | ||
28 | #include "ieee802154_i.h" | |
29 | #include "cfg.h" | |
30 | ||
31 | static void ieee802154_tasklet_handler(unsigned long data) | |
32 | { | |
33 | struct ieee802154_local *local = (struct ieee802154_local *)data; | |
34 | struct sk_buff *skb; | |
35 | ||
36 | while ((skb = skb_dequeue(&local->skb_queue))) { | |
37 | switch (skb->pkt_type) { | |
38 | case IEEE802154_RX_MSG: | |
39 | /* Clear skb->pkt_type in order to not confuse kernel | |
40 | * netstack. | |
41 | */ | |
42 | skb->pkt_type = 0; | |
43 | ieee802154_rx(local, skb); | |
44 | break; | |
45 | default: | |
46 | WARN(1, "mac802154: Packet is of unknown type %d\n", | |
47 | skb->pkt_type); | |
48 | kfree_skb(skb); | |
49 | break; | |
50 | } | |
51 | } | |
52 | } | |
53 | ||
54 | struct ieee802154_hw * | |
55 | ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops) | |
56 | { | |
57 | struct wpan_phy *phy; | |
58 | struct ieee802154_local *local; | |
59 | size_t priv_size; | |
60 | ||
61 | if (WARN_ON(!ops || !(ops->xmit_async || ops->xmit_sync) || !ops->ed || | |
62 | !ops->start || !ops->stop || !ops->set_channel)) | |
63 | return NULL; | |
64 | ||
65 | /* Ensure 32-byte alignment of our private data and hw private data. | |
66 | * We use the wpan_phy priv data for both our ieee802154_local and for | |
67 | * the driver's private data | |
68 | * | |
69 | * in memory it'll be like this: | |
70 | * | |
71 | * +-------------------------+ | |
72 | * | struct wpan_phy | | |
73 | * +-------------------------+ | |
74 | * | struct ieee802154_local | | |
75 | * +-------------------------+ | |
76 | * | driver's private data | | |
77 | * +-------------------------+ | |
78 | * | |
79 | * Due to ieee802154 layer isn't aware of driver and MAC structures, | |
80 | * so lets align them here. | |
81 | */ | |
82 | ||
83 | priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len; | |
84 | ||
85 | phy = wpan_phy_new(&mac802154_config_ops, priv_size); | |
86 | if (!phy) { | |
87 | pr_err("failure to allocate master IEEE802.15.4 device\n"); | |
88 | return NULL; | |
89 | } | |
90 | ||
91 | phy->privid = mac802154_wpan_phy_privid; | |
92 | ||
93 | local = wpan_phy_priv(phy); | |
94 | local->phy = phy; | |
95 | local->hw.phy = local->phy; | |
96 | local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN); | |
97 | local->ops = ops; | |
98 | ||
99 | INIT_LIST_HEAD(&local->interfaces); | |
100 | mutex_init(&local->iflist_mtx); | |
101 | ||
102 | tasklet_init(&local->tasklet, | |
103 | ieee802154_tasklet_handler, | |
104 | (unsigned long)local); | |
105 | ||
106 | skb_queue_head_init(&local->skb_queue); | |
107 | ||
108 | /* init supported flags with 802.15.4 default ranges */ | |
109 | phy->supported.max_minbe = 8; | |
110 | phy->supported.min_maxbe = 3; | |
111 | phy->supported.max_maxbe = 8; | |
112 | phy->supported.min_frame_retries = -1; | |
113 | phy->supported.max_frame_retries = 7; | |
114 | phy->supported.max_csma_backoffs = 5; | |
115 | phy->supported.lbt = NL802154_SUPPORTED_BOOL_FALSE; | |
116 | ||
117 | /* always supported */ | |
118 | phy->supported.iftypes = BIT(NL802154_IFTYPE_NODE); | |
119 | ||
120 | return &local->hw; | |
121 | } | |
122 | EXPORT_SYMBOL(ieee802154_alloc_hw); | |
123 | ||
124 | void ieee802154_free_hw(struct ieee802154_hw *hw) | |
125 | { | |
126 | struct ieee802154_local *local = hw_to_local(hw); | |
127 | ||
128 | BUG_ON(!list_empty(&local->interfaces)); | |
129 | ||
130 | mutex_destroy(&local->iflist_mtx); | |
131 | ||
132 | wpan_phy_free(local->phy); | |
133 | } | |
134 | EXPORT_SYMBOL(ieee802154_free_hw); | |
135 | ||
136 | static void ieee802154_setup_wpan_phy_pib(struct wpan_phy *wpan_phy) | |
137 | { | |
138 | /* TODO warn on empty symbol_duration | |
139 | * Should be done when all drivers sets this value. | |
140 | */ | |
141 | ||
142 | wpan_phy->lifs_period = IEEE802154_LIFS_PERIOD * | |
143 | wpan_phy->symbol_duration; | |
144 | wpan_phy->sifs_period = IEEE802154_SIFS_PERIOD * | |
145 | wpan_phy->symbol_duration; | |
146 | } | |
147 | ||
148 | int ieee802154_register_hw(struct ieee802154_hw *hw) | |
149 | { | |
150 | struct ieee802154_local *local = hw_to_local(hw); | |
151 | struct net_device *dev; | |
152 | int rc = -ENOSYS; | |
153 | ||
154 | local->workqueue = | |
155 | create_singlethread_workqueue(wpan_phy_name(local->phy)); | |
156 | if (!local->workqueue) { | |
157 | rc = -ENOMEM; | |
158 | goto out; | |
159 | } | |
160 | ||
161 | hrtimer_init(&local->ifs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); | |
162 | local->ifs_timer.function = ieee802154_xmit_ifs_timer; | |
163 | ||
164 | wpan_phy_set_dev(local->phy, local->hw.parent); | |
165 | ||
166 | ieee802154_setup_wpan_phy_pib(local->phy); | |
167 | ||
168 | if (!(hw->flags & IEEE802154_HW_CSMA_PARAMS)) { | |
169 | local->phy->supported.min_csma_backoffs = 4; | |
170 | local->phy->supported.max_csma_backoffs = 4; | |
171 | local->phy->supported.min_maxbe = 5; | |
172 | local->phy->supported.max_maxbe = 5; | |
173 | local->phy->supported.min_minbe = 3; | |
174 | local->phy->supported.max_minbe = 3; | |
175 | } | |
176 | ||
177 | if (!(hw->flags & IEEE802154_HW_FRAME_RETRIES)) { | |
178 | /* TODO should be 3, but our default value is -1 which means | |
179 | * no ARET handling. | |
180 | */ | |
181 | local->phy->supported.min_frame_retries = -1; | |
182 | local->phy->supported.max_frame_retries = -1; | |
183 | } | |
184 | ||
185 | if (hw->flags & IEEE802154_HW_PROMISCUOUS) | |
186 | local->phy->supported.iftypes |= BIT(NL802154_IFTYPE_MONITOR); | |
187 | ||
188 | rc = wpan_phy_register(local->phy); | |
189 | if (rc < 0) | |
190 | goto out_wq; | |
191 | ||
192 | rtnl_lock(); | |
193 | ||
194 | dev = ieee802154_if_add(local, "wpan%d", NET_NAME_ENUM, | |
195 | NL802154_IFTYPE_NODE, | |
196 | cpu_to_le64(0x0000000000000000ULL)); | |
197 | if (IS_ERR(dev)) { | |
198 | rtnl_unlock(); | |
199 | rc = PTR_ERR(dev); | |
200 | goto out_phy; | |
201 | } | |
202 | ||
203 | rtnl_unlock(); | |
204 | ||
205 | return 0; | |
206 | ||
207 | out_phy: | |
208 | wpan_phy_unregister(local->phy); | |
209 | out_wq: | |
210 | destroy_workqueue(local->workqueue); | |
211 | out: | |
212 | return rc; | |
213 | } | |
214 | EXPORT_SYMBOL(ieee802154_register_hw); | |
215 | ||
216 | void ieee802154_unregister_hw(struct ieee802154_hw *hw) | |
217 | { | |
218 | struct ieee802154_local *local = hw_to_local(hw); | |
219 | ||
220 | tasklet_kill(&local->tasklet); | |
221 | flush_workqueue(local->workqueue); | |
222 | destroy_workqueue(local->workqueue); | |
223 | ||
224 | rtnl_lock(); | |
225 | ||
226 | ieee802154_remove_interfaces(local); | |
227 | ||
228 | rtnl_unlock(); | |
229 | ||
230 | wpan_phy_unregister(local->phy); | |
231 | } | |
232 | EXPORT_SYMBOL(ieee802154_unregister_hw); | |
233 | ||
234 | static int __init ieee802154_init(void) | |
235 | { | |
236 | return ieee802154_iface_init(); | |
237 | } | |
238 | ||
239 | static void __exit ieee802154_exit(void) | |
240 | { | |
241 | ieee802154_iface_exit(); | |
242 | ||
243 | rcu_barrier(); | |
244 | } | |
245 | ||
246 | subsys_initcall(ieee802154_init); | |
247 | module_exit(ieee802154_exit); | |
248 | ||
249 | MODULE_DESCRIPTION("IEEE 802.15.4 subsystem"); | |
250 | MODULE_LICENSE("GPL v2"); |