diff options
Diffstat (limited to 'net/mac802154/rx.c')
| -rw-r--r-- | net/mac802154/rx.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/net/mac802154/rx.c b/net/mac802154/rx.c new file mode 100644 index 000000000000..4a7d76d4f8bc --- /dev/null +++ b/net/mac802154/rx.c @@ -0,0 +1,114 @@ +/* + * 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); +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); |