mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-25 02:09:42 +00:00
![Alan Ott](/assets/img/avatar_default.png)
Two sections checked whether the current channel != the new channel without ever setting the current channel variables. 1. net/mac802154/tx.c: Prevent set_channel() from getting called every time a packet is sent. 2. net/mac802154/mib.c: Lock (pib_lock) accesses to current_channel and current_page and make sure they are updated when the channel has been changed. Signed-off-by: Alan Ott <alan@signal11.us> Signed-off-by: David S. Miller <davem@davemloft.net>
131 lines
3.3 KiB
C
131 lines
3.3 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
* 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/wpan-phy.h>
|
|
|
|
#include "mac802154.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 mac802154_priv *priv;
|
|
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 mac802154_sub_if_data *sdata;
|
|
int res;
|
|
|
|
mutex_lock(&xw->priv->phy->pib_lock);
|
|
if (xw->priv->phy->current_channel != xw->chan ||
|
|
xw->priv->phy->current_page != xw->page) {
|
|
res = xw->priv->ops->set_channel(&xw->priv->hw,
|
|
xw->page,
|
|
xw->chan);
|
|
if (res) {
|
|
pr_debug("set_channel failed\n");
|
|
goto out;
|
|
}
|
|
|
|
xw->priv->phy->current_channel = xw->chan;
|
|
xw->priv->phy->current_page = xw->page;
|
|
}
|
|
|
|
res = xw->priv->ops->xmit(&xw->priv->hw, xw->skb);
|
|
if (res)
|
|
pr_debug("transmission failed\n");
|
|
|
|
out:
|
|
mutex_unlock(&xw->priv->phy->pib_lock);
|
|
|
|
/* Restart the netif queue on each sub_if_data object. */
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(sdata, &xw->priv->slaves, list)
|
|
netif_wake_queue(sdata->dev);
|
|
rcu_read_unlock();
|
|
|
|
dev_kfree_skb(xw->skb);
|
|
|
|
kfree(xw);
|
|
}
|
|
|
|
netdev_tx_t mac802154_tx(struct mac802154_priv *priv, struct sk_buff *skb,
|
|
u8 page, u8 chan)
|
|
{
|
|
struct xmit_work *work;
|
|
struct mac802154_sub_if_data *sdata;
|
|
|
|
if (!(priv->phy->channels_supported[page] & (1 << chan))) {
|
|
WARN_ON(1);
|
|
kfree_skb(skb);
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
mac802154_monitors_rx(mac802154_to_priv(&priv->hw), skb);
|
|
|
|
if (!(priv->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, priv->hw.extra_tx_headroom)) {
|
|
kfree_skb(skb);
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
work = kzalloc(sizeof(struct xmit_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, &priv->slaves, list)
|
|
netif_stop_queue(sdata->dev);
|
|
rcu_read_unlock();
|
|
|
|
INIT_WORK(&work->work, mac802154_xmit_worker);
|
|
work->skb = skb;
|
|
work->priv = priv;
|
|
work->page = page;
|
|
work->chan = chan;
|
|
|
|
queue_work(priv->dev_workqueue, &work->work);
|
|
|
|
return NETDEV_TX_OK;
|
|
}
|