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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 | ||
28 | #include <net/mac802154.h> | |
29 | #include <net/wpan-phy.h> | |
30 | ||
31 | #include "mac802154.h" | |
32 | ||
33 | /* IEEE 802.15.4 transceivers can sleep during the xmit session, so process | |
34 | * packets through the workqueue. | |
35 | */ | |
36 | struct xmit_work { | |
37 | struct sk_buff *skb; | |
38 | struct work_struct work; | |
39 | struct mac802154_priv *priv; | |
40 | u8 chan; | |
41 | u8 page; | |
5b641ebe | 42 | }; |
43 | ||
44 | static void mac802154_xmit_worker(struct work_struct *work) | |
45 | { | |
46 | struct xmit_work *xw = container_of(work, struct xmit_work, work); | |
47 | int res; | |
48 | ||
49 | mutex_lock(&xw->priv->phy->pib_lock); | |
50 | if (xw->priv->phy->current_channel != xw->chan || | |
51 | xw->priv->phy->current_page != xw->page) { | |
52 | res = xw->priv->ops->set_channel(&xw->priv->hw, | |
53 | xw->page, | |
54 | xw->chan); | |
55 | if (res) { | |
56 | pr_debug("set_channel failed\n"); | |
57 | goto out; | |
58 | } | |
59 | } | |
60 | ||
61 | res = xw->priv->ops->xmit(&xw->priv->hw, xw->skb); | |
7dd43d35 AO |
62 | if (res) |
63 | pr_debug("transmission failed\n"); | |
5b641ebe | 64 | |
65 | out: | |
66 | mutex_unlock(&xw->priv->phy->pib_lock); | |
67 | ||
5b641ebe | 68 | |
69 | dev_kfree_skb(xw->skb); | |
70 | ||
71 | kfree(xw); | |
72 | } | |
73 | ||
74 | netdev_tx_t mac802154_tx(struct mac802154_priv *priv, struct sk_buff *skb, | |
75 | u8 page, u8 chan) | |
76 | { | |
77 | struct xmit_work *work; | |
78 | ||
8a8e28b8 | 79 | if (!(priv->phy->channels_supported[page] & (1 << chan))) { |
5b641ebe | 80 | WARN_ON(1); |
fcefbe9f | 81 | kfree_skb(skb); |
5b641ebe | 82 | return NETDEV_TX_OK; |
8a8e28b8 | 83 | } |
5b641ebe | 84 | |
72fd5a8b | 85 | mac802154_monitors_rx(mac802154_to_priv(&priv->hw), skb); |
86 | ||
5b641ebe | 87 | if (!(priv->hw.flags & IEEE802154_HW_OMIT_CKSUM)) { |
88 | u16 crc = crc_ccitt(0, skb->data, skb->len); | |
89 | u8 *data = skb_put(skb, 2); | |
90 | data[0] = crc & 0xff; | |
91 | data[1] = crc >> 8; | |
92 | } | |
93 | ||
94 | if (skb_cow_head(skb, priv->hw.extra_tx_headroom)) { | |
92a2ec72 | 95 | kfree_skb(skb); |
5b641ebe | 96 | return NETDEV_TX_OK; |
97 | } | |
98 | ||
99 | work = kzalloc(sizeof(struct xmit_work), GFP_ATOMIC); | |
fcefbe9f AO |
100 | if (!work) { |
101 | kfree_skb(skb); | |
5b641ebe | 102 | return NETDEV_TX_BUSY; |
fcefbe9f | 103 | } |
5b641ebe | 104 | |
105 | INIT_WORK(&work->work, mac802154_xmit_worker); | |
106 | work->skb = skb; | |
107 | work->priv = priv; | |
108 | work->page = page; | |
109 | work->chan = chan; | |
5b641ebe | 110 | |
111 | queue_work(priv->dev_workqueue, &work->work); | |
112 | ||
113 | return NETDEV_TX_OK; | |
114 | } |