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114 lines
2.9 KiB
114 lines
2.9 KiB
/* |
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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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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 fail; |
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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 fail; |
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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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return; |
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fail: |
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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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mac802154_subif_rx(rw->dev, rw->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(*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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