2 * Copyright 2007-2012 Siemens AG
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.
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.
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>
20 #include <linux/netdevice.h>
21 #include <linux/if_arp.h>
22 #include <linux/crc-ccitt.h>
24 #include <net/ieee802154_netdev.h>
25 #include <net/mac802154.h>
26 #include <net/cfg802154.h>
28 #include "ieee802154_i.h"
30 /* IEEE 802.15.4 transceivers can sleep during the xmit session, so process
31 * packets through the workqueue.
35 struct work_struct work;
36 struct ieee802154_local *local;
41 static inline struct wpan_xmit_cb *wpan_xmit_cb(const struct sk_buff *skb)
43 BUILD_BUG_ON(sizeof(skb->cb) < sizeof(struct wpan_xmit_cb));
45 return (struct wpan_xmit_cb *)skb->cb;
48 static void mac802154_xmit_worker(struct work_struct *work)
50 struct wpan_xmit_cb *cb = container_of(work, struct wpan_xmit_cb, work);
51 struct ieee802154_local *local = cb->local;
52 struct ieee802154_sub_if_data *sdata;
53 struct sk_buff *skb = cb->skb;
56 mutex_lock(&local->phy->pib_lock);
57 if (local->phy->current_channel != cb->chan ||
58 local->phy->current_page != cb->page) {
59 res = local->ops->set_channel(&local->hw, cb->page, cb->chan);
61 pr_debug("set_channel failed\n");
65 local->phy->current_channel = cb->chan;
66 local->phy->current_page = cb->page;
69 res = local->ops->xmit(&local->hw, skb);
71 pr_debug("transmission failed\n");
74 mutex_unlock(&local->phy->pib_lock);
76 /* Restart the netif queue on each sub_if_data object. */
78 list_for_each_entry_rcu(sdata, &local->interfaces, list)
79 netif_wake_queue(sdata->dev);
85 static netdev_tx_t mac802154_tx(struct ieee802154_local *local,
86 struct sk_buff *skb, u8 page, u8 chan)
88 struct ieee802154_sub_if_data *sdata;
89 struct wpan_xmit_cb *cb = wpan_xmit_cb(skb);
91 if (!(local->phy->channels_supported[page] & (1 << chan))) {
96 mac802154_monitors_rx(local, skb);
98 if (!(local->hw.flags & IEEE802154_HW_OMIT_CKSUM)) {
99 u16 crc = crc_ccitt(0, skb->data, skb->len);
100 u8 *data = skb_put(skb, 2);
102 data[0] = crc & 0xff;
106 if (skb_cow_head(skb, local->hw.extra_tx_headroom))
109 /* Stop the netif queue on each sub_if_data object. */
111 list_for_each_entry_rcu(sdata, &local->interfaces, list)
112 netif_stop_queue(sdata->dev);
115 INIT_WORK(&cb->work, mac802154_xmit_worker);
121 queue_work(local->workqueue, &cb->work);
130 netdev_tx_t mac802154_monitor_xmit(struct sk_buff *skb, struct net_device *dev)
132 struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
136 chan = sdata->local->phy->current_channel;
137 page = sdata->local->phy->current_page;
139 if (chan == MAC802154_CHAN_NONE) /* not initialized */
142 if (WARN_ON(page >= WPAN_NUM_PAGES) ||
143 WARN_ON(chan >= WPAN_NUM_CHANNELS))
146 skb->skb_iif = dev->ifindex;
147 dev->stats.tx_packets++;
148 dev->stats.tx_bytes += skb->len;
150 return mac802154_tx(sdata->local, skb, page, chan);
153 netdev_tx_t mac802154_wpan_xmit(struct sk_buff *skb, struct net_device *dev)
155 struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
159 spin_lock_bh(&sdata->mib_lock);
162 spin_unlock_bh(&sdata->mib_lock);
164 if (chan == MAC802154_CHAN_NONE ||
165 page >= WPAN_NUM_PAGES ||
166 chan >= WPAN_NUM_CHANNELS) {
171 rc = mac802154_llsec_encrypt(&sdata->sec, skb);
173 pr_warn("encryption failed: %i\n", rc);
178 skb->skb_iif = dev->ifindex;
179 dev->stats.tx_packets++;
180 dev->stats.tx_bytes += skb->len;
182 return mac802154_tx(sdata->local, skb, page, chan);