1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
|
/*
* Copyright 2007-2012 Siemens AG
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Written by:
* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
* Sergey Lapin <slapin@ossfans.org>
* Maxim Gorbachyov <maxim.gorbachev@siemens.com>
* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
*/
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/crc-ccitt.h>
#include <net/ieee802154_netdev.h>
#include <net/mac802154.h>
#include <net/cfg802154.h>
#include "ieee802154_i.h"
/* IEEE 802.15.4 transceivers can sleep during the xmit session, so process
* packets through the workqueue.
*/
struct xmit_work {
struct sk_buff *skb;
struct work_struct work;
struct ieee802154_local *local;
u8 chan;
u8 page;
};
static void mac802154_xmit_worker(struct work_struct *work)
{
struct xmit_work *xw = container_of(work, struct xmit_work, work);
struct ieee802154_sub_if_data *sdata;
int res;
mutex_lock(&xw->local->phy->pib_lock);
if (xw->local->phy->current_channel != xw->chan ||
xw->local->phy->current_page != xw->page) {
res = xw->local->ops->set_channel(&xw->local->hw,
xw->page,
xw->chan);
if (res) {
pr_debug("set_channel failed\n");
goto out;
}
xw->local->phy->current_channel = xw->chan;
xw->local->phy->current_page = xw->page;
}
res = xw->local->ops->xmit(&xw->local->hw, xw->skb);
if (res)
pr_debug("transmission failed\n");
out:
mutex_unlock(&xw->local->phy->pib_lock);
/* Restart the netif queue on each sub_if_data object. */
rcu_read_lock();
list_for_each_entry_rcu(sdata, &xw->local->interfaces, list)
netif_wake_queue(sdata->dev);
rcu_read_unlock();
dev_kfree_skb(xw->skb);
kfree(xw);
}
netdev_tx_t mac802154_tx(struct ieee802154_local *local, struct sk_buff *skb,
u8 page, u8 chan)
{
struct xmit_work *work;
struct ieee802154_sub_if_data *sdata;
if (!(local->phy->channels_supported[page] & (1 << chan))) {
WARN_ON(1);
goto err_tx;
}
mac802154_monitors_rx(mac802154_to_priv(&local->hw), skb);
if (!(local->hw.flags & IEEE802154_HW_OMIT_CKSUM)) {
u16 crc = crc_ccitt(0, skb->data, skb->len);
u8 *data = skb_put(skb, 2);
data[0] = crc & 0xff;
data[1] = crc >> 8;
}
if (skb_cow_head(skb, local->hw.extra_tx_headroom))
goto err_tx;
work = kzalloc(sizeof(*work), GFP_ATOMIC);
if (!work) {
kfree_skb(skb);
return NETDEV_TX_BUSY;
}
/* Stop the netif queue on each sub_if_data object. */
rcu_read_lock();
list_for_each_entry_rcu(sdata, &local->interfaces, list)
netif_stop_queue(sdata->dev);
rcu_read_unlock();
INIT_WORK(&work->work, mac802154_xmit_worker);
work->skb = skb;
work->local = local;
work->page = page;
work->chan = chan;
queue_work(local->dev_workqueue, &work->work);
return NETDEV_TX_OK;
err_tx:
kfree_skb(skb);
return NETDEV_TX_OK;
}
|
