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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; |
42 | u8 xmit_attempts; |
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); |
48 | int res; |
49 | |
50 | mutex_lock(&xw->priv->phy->pib_lock); |
51 | if (xw->priv->phy->current_channel != xw->chan || |
52 | xw->priv->phy->current_page != xw->page) { |
53 | res = xw->priv->ops->set_channel(&xw->priv->hw, |
54 | xw->page, |
55 | xw->chan); |
56 | if (res) { |
57 | pr_debug("set_channel failed\n"); |
58 | goto out; |
59 | } |
60 | } |
61 | |
62 | res = xw->priv->ops->xmit(&xw->priv->hw, xw->skb); |
63 | |
64 | out: |
65 | mutex_unlock(&xw->priv->phy->pib_lock); |
66 | |
67 | if (res) { |
68 | if (xw->xmit_attempts++ < MAC802154_MAX_XMIT_ATTEMPTS) { |
69 | queue_work(xw->priv->dev_workqueue, &xw->work); |
70 | return; |
71 | } else |
72 | pr_debug("transmission failed for %d times", |
73 | MAC802154_MAX_XMIT_ATTEMPTS); |
74 | } |
75 | |
76 | dev_kfree_skb(xw->skb); |
77 | |
78 | kfree(xw); |
79 | } |
80 | |
81 | netdev_tx_t mac802154_tx(struct mac802154_priv *priv, struct sk_buff *skb, |
82 | u8 page, u8 chan) |
83 | { |
84 | struct xmit_work *work; |
85 | |
8a8e28b8 |
86 | if (!(priv->phy->channels_supported[page] & (1 << chan))) { |
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87 | WARN_ON(1); |
88 | return NETDEV_TX_OK; |
8a8e28b8 |
89 | } |
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90 | |
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91 | mac802154_monitors_rx(mac802154_to_priv(&priv->hw), skb); |
92 | |
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93 | if (!(priv->hw.flags & IEEE802154_HW_OMIT_CKSUM)) { |
94 | u16 crc = crc_ccitt(0, skb->data, skb->len); |
95 | u8 *data = skb_put(skb, 2); |
96 | data[0] = crc & 0xff; |
97 | data[1] = crc >> 8; |
98 | } |
99 | |
100 | if (skb_cow_head(skb, priv->hw.extra_tx_headroom)) { |
101 | dev_kfree_skb(skb); |
102 | return NETDEV_TX_OK; |
103 | } |
104 | |
105 | work = kzalloc(sizeof(struct xmit_work), GFP_ATOMIC); |
106 | if (!work) |
107 | return NETDEV_TX_BUSY; |
108 | |
109 | INIT_WORK(&work->work, mac802154_xmit_worker); |
110 | work->skb = skb; |
111 | work->priv = priv; |
112 | work->page = page; |
113 | work->chan = chan; |
114 | work->xmit_attempts = 0; |
115 | |
116 | queue_work(priv->dev_workqueue, &work->work); |
117 | |
118 | return NETDEV_TX_OK; |
119 | } |