Commit | Line | Data |
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5b641ebe | 1 | /* |
2 | * Copyright 2007-2012 Siemens AG | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 | |
6 | * as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along | |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | * | |
17 | * Written by: | |
18 | * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> | |
19 | * Sergey Lapin <slapin@ossfans.org> | |
20 | * Maxim Gorbachyov <maxim.gorbachev@siemens.com> | |
21 | * Alexander Smirnov <alex.bluesman.smirnov@gmail.com> | |
22 | */ | |
23 | ||
24 | #include <linux/netdevice.h> | |
25 | #include <linux/if_arp.h> | |
26 | #include <linux/crc-ccitt.h> | |
27 | ||
b5992fe9 | 28 | #include <net/ieee802154_netdev.h> |
5b641ebe | 29 | #include <net/mac802154.h> |
30 | #include <net/wpan-phy.h> | |
31 | ||
32 | #include "mac802154.h" | |
33 | ||
34 | /* IEEE 802.15.4 transceivers can sleep during the xmit session, so process | |
35 | * packets through the workqueue. | |
36 | */ | |
37 | struct xmit_work { | |
38 | struct sk_buff *skb; | |
39 | struct work_struct work; | |
40 | struct mac802154_priv *priv; | |
41 | u8 chan; | |
42 | u8 page; | |
5b641ebe | 43 | }; |
44 | ||
45 | static void mac802154_xmit_worker(struct work_struct *work) | |
46 | { | |
47 | struct xmit_work *xw = container_of(work, struct xmit_work, work); | |
b5992fe9 | 48 | struct mac802154_sub_if_data *sdata; |
5b641ebe | 49 | int res; |
50 | ||
51 | mutex_lock(&xw->priv->phy->pib_lock); | |
52 | if (xw->priv->phy->current_channel != xw->chan || | |
53 | xw->priv->phy->current_page != xw->page) { | |
54 | res = xw->priv->ops->set_channel(&xw->priv->hw, | |
55 | xw->page, | |
56 | xw->chan); | |
57 | if (res) { | |
58 | pr_debug("set_channel failed\n"); | |
59 | goto out; | |
60 | } | |
9f7f78b4 AO |
61 | |
62 | xw->priv->phy->current_channel = xw->chan; | |
63 | xw->priv->phy->current_page = xw->page; | |
5b641ebe | 64 | } |
65 | ||
66 | res = xw->priv->ops->xmit(&xw->priv->hw, xw->skb); | |
7dd43d35 AO |
67 | if (res) |
68 | pr_debug("transmission failed\n"); | |
5b641ebe | 69 | |
70 | out: | |
71 | mutex_unlock(&xw->priv->phy->pib_lock); | |
72 | ||
b5992fe9 AO |
73 | /* Restart the netif queue on each sub_if_data object. */ |
74 | rcu_read_lock(); | |
75 | list_for_each_entry_rcu(sdata, &xw->priv->slaves, list) | |
76 | netif_wake_queue(sdata->dev); | |
77 | rcu_read_unlock(); | |
5b641ebe | 78 | |
79 | dev_kfree_skb(xw->skb); | |
80 | ||
81 | kfree(xw); | |
82 | } | |
83 | ||
84 | netdev_tx_t mac802154_tx(struct mac802154_priv *priv, struct sk_buff *skb, | |
85 | u8 page, u8 chan) | |
86 | { | |
87 | struct xmit_work *work; | |
b5992fe9 | 88 | struct mac802154_sub_if_data *sdata; |
5b641ebe | 89 | |
8a8e28b8 | 90 | if (!(priv->phy->channels_supported[page] & (1 << chan))) { |
5b641ebe | 91 | WARN_ON(1); |
fcefbe9f | 92 | kfree_skb(skb); |
5b641ebe | 93 | return NETDEV_TX_OK; |
8a8e28b8 | 94 | } |
5b641ebe | 95 | |
72fd5a8b | 96 | mac802154_monitors_rx(mac802154_to_priv(&priv->hw), skb); |
97 | ||
5b641ebe | 98 | if (!(priv->hw.flags & IEEE802154_HW_OMIT_CKSUM)) { |
99 | u16 crc = crc_ccitt(0, skb->data, skb->len); | |
100 | u8 *data = skb_put(skb, 2); | |
101 | data[0] = crc & 0xff; | |
102 | data[1] = crc >> 8; | |
103 | } | |
104 | ||
105 | if (skb_cow_head(skb, priv->hw.extra_tx_headroom)) { | |
92a2ec72 | 106 | kfree_skb(skb); |
5b641ebe | 107 | return NETDEV_TX_OK; |
108 | } | |
109 | ||
110 | work = kzalloc(sizeof(struct xmit_work), GFP_ATOMIC); | |
fcefbe9f AO |
111 | if (!work) { |
112 | kfree_skb(skb); | |
5b641ebe | 113 | return NETDEV_TX_BUSY; |
fcefbe9f | 114 | } |
5b641ebe | 115 | |
b5992fe9 AO |
116 | /* Stop the netif queue on each sub_if_data object. */ |
117 | rcu_read_lock(); | |
118 | list_for_each_entry_rcu(sdata, &priv->slaves, list) | |
119 | netif_stop_queue(sdata->dev); | |
120 | rcu_read_unlock(); | |
121 | ||
5b641ebe | 122 | INIT_WORK(&work->work, mac802154_xmit_worker); |
123 | work->skb = skb; | |
124 | work->priv = priv; | |
125 | work->page = page; | |
126 | work->chan = chan; | |
5b641ebe | 127 | |
128 | queue_work(priv->dev_workqueue, &work->work); | |
129 | ||
130 | return NETDEV_TX_OK; | |
131 | } |