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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 | * | |
5b641ebe | 13 | * Written by: |
14 | * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> | |
15 | * Sergey Lapin <slapin@ossfans.org> | |
16 | * Maxim Gorbachyov <maxim.gorbachev@siemens.com> | |
17 | * Alexander Smirnov <alex.bluesman.smirnov@gmail.com> | |
18 | */ | |
19 | ||
20 | #include <linux/netdevice.h> | |
21 | #include <linux/if_arp.h> | |
22 | #include <linux/crc-ccitt.h> | |
23 | ||
6001d522 | 24 | #include <net/rtnetlink.h> |
b5992fe9 | 25 | #include <net/ieee802154_netdev.h> |
5b641ebe | 26 | #include <net/mac802154.h> |
5ad60d36 | 27 | #include <net/cfg802154.h> |
5b641ebe | 28 | |
0f1556bc | 29 | #include "ieee802154_i.h" |
5b641ebe | 30 | |
31 | /* IEEE 802.15.4 transceivers can sleep during the xmit session, so process | |
32 | * packets through the workqueue. | |
33 | */ | |
e5e584fc | 34 | struct ieee802154_xmit_cb { |
5b641ebe | 35 | struct sk_buff *skb; |
36 | struct work_struct work; | |
a5e1ec53 | 37 | struct ieee802154_local *local; |
5b641ebe | 38 | }; |
39 | ||
e5e584fc AA |
40 | static inline struct ieee802154_xmit_cb * |
41 | ieee802154_xmit_cb(const struct sk_buff *skb) | |
fe24371d | 42 | { |
e5e584fc | 43 | BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct ieee802154_xmit_cb)); |
fe24371d | 44 | |
e5e584fc | 45 | return (struct ieee802154_xmit_cb *)skb->cb; |
fe24371d AA |
46 | } |
47 | ||
e5e584fc | 48 | static void ieee802154_xmit_worker(struct work_struct *work) |
5b641ebe | 49 | { |
e5e584fc AA |
50 | struct ieee802154_xmit_cb *cb = |
51 | container_of(work, struct ieee802154_xmit_cb, work); | |
e89e45f2 | 52 | struct ieee802154_local *local = cb->local; |
e89e45f2 | 53 | struct sk_buff *skb = cb->skb; |
409c3b0c | 54 | struct net_device *dev = skb->dev; |
5b641ebe | 55 | int res; |
56 | ||
6001d522 AA |
57 | rtnl_lock(); |
58 | ||
59 | /* check if ifdown occurred while schedule */ | |
409c3b0c | 60 | if (!netif_running(dev)) |
6001d522 AA |
61 | goto err_tx; |
62 | ||
ed0a5dce | 63 | res = local->ops->xmit_sync(&local->hw, skb); |
6001d522 AA |
64 | if (res) |
65 | goto err_tx; | |
66 | ||
67 | ieee802154_xmit_complete(&local->hw, skb); | |
68 | ||
409c3b0c AA |
69 | dev->stats.tx_packets++; |
70 | dev->stats.tx_bytes += skb->len; | |
71 | ||
6001d522 AA |
72 | rtnl_unlock(); |
73 | ||
74 | return; | |
75 | ||
76 | err_tx: | |
77 | /* Restart the netif queue on each sub_if_data object. */ | |
78 | ieee802154_wake_queue(&local->hw); | |
79 | rtnl_unlock(); | |
80 | kfree_skb(skb); | |
409c3b0c | 81 | netdev_dbg(dev, "transmission failed\n"); |
5b641ebe | 82 | } |
83 | ||
dc67c6b3 | 84 | static netdev_tx_t |
e5e584fc | 85 | ieee802154_tx(struct ieee802154_local *local, struct sk_buff *skb) |
5b641ebe | 86 | { |
e5e584fc | 87 | struct ieee802154_xmit_cb *cb = ieee802154_xmit_cb(skb); |
409c3b0c | 88 | struct net_device *dev = skb->dev; |
ed0a5dce | 89 | int ret; |
5b641ebe | 90 | |
60741361 | 91 | mac802154_monitors_rx(local, skb); |
72fd5a8b | 92 | |
a5e1ec53 | 93 | if (!(local->hw.flags & IEEE802154_HW_OMIT_CKSUM)) { |
b7eec52b | 94 | __le16 crc = cpu_to_le16(crc_ccitt(0, skb->data, skb->len)); |
4710d806 | 95 | |
b7eec52b | 96 | memcpy(skb_put(skb, 2), &crc, 2); |
5b641ebe | 97 | } |
98 | ||
a5e1ec53 | 99 | if (skb_cow_head(skb, local->hw.extra_tx_headroom)) |
f5588912 | 100 | goto err_tx; |
5b641ebe | 101 | |
b5992fe9 | 102 | /* Stop the netif queue on each sub_if_data object. */ |
18d60a0d | 103 | ieee802154_stop_queue(&local->hw); |
b5992fe9 | 104 | |
ed0a5dce AA |
105 | /* async is priority, otherwise sync is fallback */ |
106 | if (local->ops->xmit_async) { | |
107 | ret = local->ops->xmit_async(&local->hw, skb); | |
108 | if (ret) { | |
109 | ieee802154_wake_queue(&local->hw); | |
110 | goto err_tx; | |
111 | } | |
409c3b0c AA |
112 | |
113 | dev->stats.tx_packets++; | |
114 | dev->stats.tx_bytes += skb->len; | |
ed0a5dce | 115 | } else { |
e5e584fc | 116 | INIT_WORK(&cb->work, ieee802154_xmit_worker); |
ed0a5dce AA |
117 | cb->skb = skb; |
118 | cb->local = local; | |
5b641ebe | 119 | |
ed0a5dce AA |
120 | queue_work(local->workqueue, &cb->work); |
121 | } | |
5b641ebe | 122 | |
123 | return NETDEV_TX_OK; | |
f5588912 VB |
124 | |
125 | err_tx: | |
126 | kfree_skb(skb); | |
127 | return NETDEV_TX_OK; | |
5b641ebe | 128 | } |
50c6fb99 | 129 | |
e5e584fc AA |
130 | netdev_tx_t |
131 | ieee802154_monitor_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
50c6fb99 AA |
132 | { |
133 | struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev); | |
50c6fb99 AA |
134 | |
135 | skb->skb_iif = dev->ifindex; | |
50c6fb99 | 136 | |
e5e584fc | 137 | return ieee802154_tx(sdata->local, skb); |
50c6fb99 AA |
138 | } |
139 | ||
e5e584fc AA |
140 | netdev_tx_t |
141 | ieee802154_subif_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
50c6fb99 AA |
142 | { |
143 | struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev); | |
50c6fb99 AA |
144 | int rc; |
145 | ||
50c6fb99 AA |
146 | rc = mac802154_llsec_encrypt(&sdata->sec, skb); |
147 | if (rc) { | |
cfa626cb | 148 | netdev_warn(dev, "encryption failed: %i\n", rc); |
50c6fb99 AA |
149 | kfree_skb(skb); |
150 | return NETDEV_TX_OK; | |
151 | } | |
152 | ||
153 | skb->skb_iif = dev->ifindex; | |
50c6fb99 | 154 | |
e5e584fc | 155 | return ieee802154_tx(sdata->local, skb); |
50c6fb99 | 156 | } |