tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 * 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#include <asm/unaligned.h>
24
25#include <net/rtnetlink.h>
26#include <net/ieee802154_netdev.h>
27#include <net/mac802154.h>
28#include <net/cfg802154.h>
29
30#include "ieee802154_i.h"
31#include "driver-ops.h"
32
33void ieee802154_xmit_worker(struct work_struct *work)
34{
35 struct ieee802154_local *local =
36 container_of(work, struct ieee802154_local, tx_work);
37 struct sk_buff *skb = local->tx_skb;
38 struct net_device *dev = skb->dev;
39 int res;
40
41 res = drv_xmit_sync(local, skb);
42 if (res)
43 goto err_tx;
44
45 ieee802154_xmit_complete(&local->hw, skb, false);
46
47 dev->stats.tx_packets++;
48 dev->stats.tx_bytes += skb->len;
49
50 return;
51
52err_tx:
53 /* Restart the netif queue on each sub_if_data object. */
54 ieee802154_wake_queue(&local->hw);
55 kfree_skb(skb);
56 netdev_dbg(dev, "transmission failed\n");
57}
58
59static netdev_tx_t
60ieee802154_tx(struct ieee802154_local *local, struct sk_buff *skb)
61{
62 struct net_device *dev = skb->dev;
63 int ret;
64
65 if (!(local->hw.flags & IEEE802154_HW_TX_OMIT_CKSUM)) {
66 struct sk_buff *nskb;
67 u16 crc;
68
69 if (unlikely(skb_tailroom(skb) < IEEE802154_FCS_LEN)) {
70 nskb = skb_copy_expand(skb, 0, IEEE802154_FCS_LEN,
71 GFP_ATOMIC);
72 if (likely(nskb)) {
73 consume_skb(skb);
74 skb = nskb;
75 } else {
76 goto err_tx;
77 }
78 }
79
80 crc = crc_ccitt(0, skb->data, skb->len);
81 put_unaligned_le16(crc, skb_put(skb, 2));
82 }
83
84 /* Stop the netif queue on each sub_if_data object. */
85 ieee802154_stop_queue(&local->hw);
86
87 /* async is priority, otherwise sync is fallback */
88 if (local->ops->xmit_async) {
89 ret = drv_xmit_async(local, skb);
90 if (ret) {
91 ieee802154_wake_queue(&local->hw);
92 goto err_tx;
93 }
94
95 dev->stats.tx_packets++;
96 dev->stats.tx_bytes += skb->len;
97 } else {
98 local->tx_skb = skb;
99 queue_work(local->workqueue, &local->tx_work);
100 }
101
102 return NETDEV_TX_OK;
103
104err_tx:
105 kfree_skb(skb);
106 return NETDEV_TX_OK;
107}
108
109netdev_tx_t
110ieee802154_monitor_start_xmit(struct sk_buff *skb, struct net_device *dev)
111{
112 struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
113
114 skb->skb_iif = dev->ifindex;
115
116 return ieee802154_tx(sdata->local, skb);
117}
118
119netdev_tx_t
120ieee802154_subif_start_xmit(struct sk_buff *skb, struct net_device *dev)
121{
122 struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
123 int rc;
124
125 /* TODO we should move it to wpan_dev_hard_header and dev_hard_header
126 * functions. The reason is wireshark will show a mac header which is
127 * with security fields but the payload is not encrypted.
128 */
129 rc = mac802154_llsec_encrypt(&sdata->sec, skb);
130 if (rc) {
131 netdev_warn(dev, "encryption failed: %i\n", rc);
132 kfree_skb(skb);
133 return NETDEV_TX_OK;
134 }
135
136 skb->skb_iif = dev->ifindex;
137
138 return ieee802154_tx(sdata->local, skb);
139}