GNU Linux-libre 4.19.211-gnu1
[releases.git] / net / mac802154 / main.c
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_WORK(&local->tx_work, ieee802154_xmit_worker);
109
110         /* init supported flags with 802.15.4 default ranges */
111         phy->supported.max_minbe = 8;
112         phy->supported.min_maxbe = 3;
113         phy->supported.max_maxbe = 8;
114         phy->supported.min_frame_retries = 0;
115         phy->supported.max_frame_retries = 7;
116         phy->supported.max_csma_backoffs = 5;
117         phy->supported.lbt = NL802154_SUPPORTED_BOOL_FALSE;
118
119         /* always supported */
120         phy->supported.iftypes = BIT(NL802154_IFTYPE_NODE);
121
122         return &local->hw;
123 }
124 EXPORT_SYMBOL(ieee802154_alloc_hw);
125
126 void ieee802154_free_hw(struct ieee802154_hw *hw)
127 {
128         struct ieee802154_local *local = hw_to_local(hw);
129
130         BUG_ON(!list_empty(&local->interfaces));
131
132         mutex_destroy(&local->iflist_mtx);
133
134         wpan_phy_free(local->phy);
135 }
136 EXPORT_SYMBOL(ieee802154_free_hw);
137
138 static void ieee802154_setup_wpan_phy_pib(struct wpan_phy *wpan_phy)
139 {
140         /* TODO warn on empty symbol_duration
141          * Should be done when all drivers sets this value.
142          */
143
144         wpan_phy->lifs_period = IEEE802154_LIFS_PERIOD *
145                                 wpan_phy->symbol_duration;
146         wpan_phy->sifs_period = IEEE802154_SIFS_PERIOD *
147                                 wpan_phy->symbol_duration;
148 }
149
150 int ieee802154_register_hw(struct ieee802154_hw *hw)
151 {
152         struct ieee802154_local *local = hw_to_local(hw);
153         struct net_device *dev;
154         int rc = -ENOSYS;
155
156         local->workqueue =
157                 create_singlethread_workqueue(wpan_phy_name(local->phy));
158         if (!local->workqueue) {
159                 rc = -ENOMEM;
160                 goto out;
161         }
162
163         hrtimer_init(&local->ifs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
164         local->ifs_timer.function = ieee802154_xmit_ifs_timer;
165
166         wpan_phy_set_dev(local->phy, local->hw.parent);
167
168         ieee802154_setup_wpan_phy_pib(local->phy);
169
170         if (!(hw->flags & IEEE802154_HW_CSMA_PARAMS)) {
171                 local->phy->supported.min_csma_backoffs = 4;
172                 local->phy->supported.max_csma_backoffs = 4;
173                 local->phy->supported.min_maxbe = 5;
174                 local->phy->supported.max_maxbe = 5;
175                 local->phy->supported.min_minbe = 3;
176                 local->phy->supported.max_minbe = 3;
177         }
178
179         if (!(hw->flags & IEEE802154_HW_FRAME_RETRIES)) {
180                 local->phy->supported.min_frame_retries = 3;
181                 local->phy->supported.max_frame_retries = 3;
182         }
183
184         if (hw->flags & IEEE802154_HW_PROMISCUOUS)
185                 local->phy->supported.iftypes |= BIT(NL802154_IFTYPE_MONITOR);
186
187         rc = wpan_phy_register(local->phy);
188         if (rc < 0)
189                 goto out_wq;
190
191         rtnl_lock();
192
193         dev = ieee802154_if_add(local, "wpan%d", NET_NAME_ENUM,
194                                 NL802154_IFTYPE_NODE,
195                                 cpu_to_le64(0x0000000000000000ULL));
196         if (IS_ERR(dev)) {
197                 rtnl_unlock();
198                 rc = PTR_ERR(dev);
199                 goto out_phy;
200         }
201
202         rtnl_unlock();
203
204         return 0;
205
206 out_phy:
207         wpan_phy_unregister(local->phy);
208 out_wq:
209         destroy_workqueue(local->workqueue);
210 out:
211         return rc;
212 }
213 EXPORT_SYMBOL(ieee802154_register_hw);
214
215 void ieee802154_unregister_hw(struct ieee802154_hw *hw)
216 {
217         struct ieee802154_local *local = hw_to_local(hw);
218
219         tasklet_kill(&local->tasklet);
220         flush_workqueue(local->workqueue);
221
222         rtnl_lock();
223
224         ieee802154_remove_interfaces(local);
225
226         rtnl_unlock();
227
228         destroy_workqueue(local->workqueue);
229         wpan_phy_unregister(local->phy);
230 }
231 EXPORT_SYMBOL(ieee802154_unregister_hw);
232
233 static int __init ieee802154_init(void)
234 {
235         return ieee802154_iface_init();
236 }
237
238 static void __exit ieee802154_exit(void)
239 {
240         ieee802154_iface_exit();
241
242         rcu_barrier();
243 }
244
245 subsys_initcall(ieee802154_init);
246 module_exit(ieee802154_exit);
247
248 MODULE_DESCRIPTION("IEEE 802.15.4 subsystem");
249 MODULE_LICENSE("GPL v2");