115 lines
3.0 KiB
C
115 lines
3.0 KiB
C
/*
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* Copyright (C) 2007-2012 Siemens AG
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Written by:
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* Pavel Smolenskiy <pavel.smolenskiy@gmail.com>
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* Maxim Gorbachyov <maxim.gorbachev@siemens.com>
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* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
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* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/workqueue.h>
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#include <linux/netdevice.h>
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#include <linux/crc-ccitt.h>
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#include <net/mac802154.h>
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#include <net/ieee802154_netdev.h>
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#include "mac802154.h"
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/* The IEEE 802.15.4 standard defines 4 MAC packet types:
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* - beacon frame
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* - MAC command frame
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* - acknowledgement frame
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* - data frame
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*
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* and only the data frame should be pushed to the upper layers, other types
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* are just internal MAC layer management information. So only data packets
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* are going to be sent to the networking queue, all other will be processed
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* right here by using the device workqueue.
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*/
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struct rx_work {
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struct sk_buff *skb;
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struct work_struct work;
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struct ieee802154_dev *dev;
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u8 lqi;
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};
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static void
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mac802154_subif_rx(struct ieee802154_dev *hw, struct sk_buff *skb, u8 lqi)
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{
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struct mac802154_priv *priv = mac802154_to_priv(hw);
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mac_cb(skb)->lqi = lqi;
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skb->protocol = htons(ETH_P_IEEE802154);
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skb_reset_mac_header(skb);
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BUILD_BUG_ON(sizeof(struct ieee802154_mac_cb) > sizeof(skb->cb));
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if (!(priv->hw.flags & IEEE802154_HW_OMIT_CKSUM)) {
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u16 crc;
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if (skb->len < 2) {
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pr_debug("got invalid frame\n");
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goto out;
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}
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crc = crc_ccitt(0, skb->data, skb->len);
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if (crc) {
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pr_debug("CRC mismatch\n");
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goto out;
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}
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skb_trim(skb, skb->len - 2); /* CRC */
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}
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mac802154_monitors_rx(priv, skb);
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mac802154_wpans_rx(priv, skb);
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out:
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dev_kfree_skb(skb);
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}
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static void mac802154_rx_worker(struct work_struct *work)
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{
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struct rx_work *rw = container_of(work, struct rx_work, work);
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struct sk_buff *skb = rw->skb;
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mac802154_subif_rx(rw->dev, skb, rw->lqi);
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kfree(rw);
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}
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void
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ieee802154_rx_irqsafe(struct ieee802154_dev *dev, struct sk_buff *skb, u8 lqi)
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{
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struct mac802154_priv *priv = mac802154_to_priv(dev);
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struct rx_work *work;
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if (!skb)
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return;
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work = kzalloc(sizeof(struct rx_work), GFP_ATOMIC);
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if (!work)
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return;
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INIT_WORK(&work->work, mac802154_rx_worker);
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work->skb = skb;
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work->dev = dev;
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work->lqi = lqi;
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queue_work(priv->dev_workqueue, &work->work);
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}
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EXPORT_SYMBOL(ieee802154_rx_irqsafe);
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