116 lines
3.0 KiB
C
116 lines
3.0 KiB
C
/*
|
|
* Copyright (C) 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:
|
|
* Pavel Smolenskiy <pavel.smolenskiy@gmail.com>
|
|
* Maxim Gorbachyov <maxim.gorbachev@siemens.com>
|
|
* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
|
|
* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/crc-ccitt.h>
|
|
|
|
#include <net/mac802154.h>
|
|
#include <net/ieee802154_netdev.h>
|
|
|
|
#include "mac802154.h"
|
|
|
|
/* The IEEE 802.15.4 standard defines 4 MAC packet types:
|
|
* - beacon frame
|
|
* - MAC command frame
|
|
* - acknowledgement frame
|
|
* - data frame
|
|
*
|
|
* and only the data frame should be pushed to the upper layers, other types
|
|
* are just internal MAC layer management information. So only data packets
|
|
* are going to be sent to the networking queue, all other will be processed
|
|
* right here by using the device workqueue.
|
|
*/
|
|
struct rx_work {
|
|
struct sk_buff *skb;
|
|
struct work_struct work;
|
|
struct ieee802154_dev *dev;
|
|
u8 lqi;
|
|
};
|
|
|
|
static void
|
|
mac802154_subif_rx(struct ieee802154_dev *hw, struct sk_buff *skb, u8 lqi)
|
|
{
|
|
struct mac802154_priv *priv = mac802154_to_priv(hw);
|
|
|
|
mac_cb(skb)->lqi = lqi;
|
|
skb->protocol = htons(ETH_P_IEEE802154);
|
|
skb_reset_mac_header(skb);
|
|
|
|
BUILD_BUG_ON(sizeof(struct ieee802154_mac_cb) > sizeof(skb->cb));
|
|
|
|
if (!(priv->hw.flags & IEEE802154_HW_OMIT_CKSUM)) {
|
|
u16 crc;
|
|
|
|
if (skb->len < 2) {
|
|
pr_debug("got invalid frame\n");
|
|
goto out;
|
|
}
|
|
crc = crc_ccitt(0, skb->data, skb->len);
|
|
if (crc) {
|
|
pr_debug("CRC mismatch\n");
|
|
goto out;
|
|
}
|
|
skb_trim(skb, skb->len - 2); /* CRC */
|
|
}
|
|
|
|
mac802154_monitors_rx(priv, skb);
|
|
mac802154_wpans_rx(priv, skb);
|
|
out:
|
|
dev_kfree_skb(skb);
|
|
return;
|
|
}
|
|
|
|
static void mac802154_rx_worker(struct work_struct *work)
|
|
{
|
|
struct rx_work *rw = container_of(work, struct rx_work, work);
|
|
struct sk_buff *skb = rw->skb;
|
|
|
|
mac802154_subif_rx(rw->dev, skb, rw->lqi);
|
|
kfree(rw);
|
|
}
|
|
|
|
void
|
|
ieee802154_rx_irqsafe(struct ieee802154_dev *dev, struct sk_buff *skb, u8 lqi)
|
|
{
|
|
struct mac802154_priv *priv = mac802154_to_priv(dev);
|
|
struct rx_work *work;
|
|
|
|
if (!skb)
|
|
return;
|
|
|
|
work = kzalloc(sizeof(struct rx_work), GFP_ATOMIC);
|
|
if (!work)
|
|
return;
|
|
|
|
INIT_WORK(&work->work, mac802154_rx_worker);
|
|
work->skb = skb;
|
|
work->dev = dev;
|
|
work->lqi = lqi;
|
|
|
|
queue_work(priv->dev_workqueue, &work->work);
|
|
}
|
|
EXPORT_SYMBOL(ieee802154_rx_irqsafe);
|