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Date: Sat, 12 May 2012 17:59:15 +0400
From: Alexander Smirnov <alex.bluesman.smirnov@...il.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, dbaryshkov@...il.com,
Alexander Smirnov <alex.bluesman.smirnov@...il.com>
Subject: [PATCH net-next v4 03/13] mac802154: RX data path
Main RX data path implementation between physical and mac layers.
The ieee802.15.4 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.
Signed-off-by: Alexander Smirnov <alex.bluesman.smirnov@...il.com>
---
include/net/ieee802154_netdev.h | 2 +
include/net/mac802154.h | 4 ++
net/mac802154/Makefile | 2 +-
net/mac802154/rx.c | 109 +++++++++++++++++++++++++++++++++++++++
4 files changed, 116 insertions(+), 1 deletions(-)
create mode 100644 net/mac802154/rx.c
diff --git a/include/net/ieee802154_netdev.h b/include/net/ieee802154_netdev.h
index 5743055..12a7ee4 100644
--- a/include/net/ieee802154_netdev.h
+++ b/include/net/ieee802154_netdev.h
@@ -26,6 +26,8 @@
#ifndef IEEE802154_NETDEVICE_H
#define IEEE802154_NETDEVICE_H
+#include <net/af_ieee802154.h>
+
/*
* A control block of skb passed between the ARPHRD_IEEE802154 device
* and other stack parts.
diff --git a/include/net/mac802154.h b/include/net/mac802154.h
index ef27d07..cdc0100 100644
--- a/include/net/mac802154.h
+++ b/include/net/mac802154.h
@@ -134,4 +134,8 @@ void ieee802154_free_device(struct ieee802154_dev *dev);
int ieee802154_register_device(struct ieee802154_dev *dev);
void ieee802154_unregister_device(struct ieee802154_dev *dev);
+void ieee802154_rx(struct ieee802154_dev *dev, struct sk_buff *skb, u8 lqi);
+void ieee802154_rx_irqsafe(struct ieee802154_dev *dev, struct sk_buff *skb,
+ u8 lqi);
+
#endif /* NET_MAC802154_H */
diff --git a/net/mac802154/Makefile b/net/mac802154/Makefile
index cda9393..e00fe47 100644
--- a/net/mac802154/Makefile
+++ b/net/mac802154/Makefile
@@ -1,2 +1,2 @@
obj-$(CONFIG_MAC802154) += mac802154.o
-mac802154-objs := ieee802154_dev.o
+mac802154-objs := ieee802154_dev.o rx.o
diff --git a/net/mac802154/rx.c b/net/mac802154/rx.c
new file mode 100644
index 0000000..3446379
--- /dev/null
+++ b/net/mac802154/rx.c
@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2007-2011 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@...il.com>
+ * Maxim Gorbachyov <maxim.gorbachev@...mens.com>
+ * Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
+ * Alexander Smirnov <alex.bluesman.smirnov@...il.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"
+
+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("(%s): got invalid frame\n", __func__);
+ goto out;
+ }
+ crc = crc_ccitt(0, skb->data, skb->len);
+ if (crc) {
+ pr_debug("(%s): CRC mismatch\n", __func__);
+ goto out;
+ }
+ skb_trim(skb, skb->len - 2); /* CRC */
+ }
+
+out:
+ dev_kfree_skb(skb);
+ return;
+}
+
+struct rx_work {
+ struct sk_buff *skb;
+ struct work_struct work;
+ struct ieee802154_dev *dev;
+ u8 lqi;
+};
+
+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);
+
+void mac802154_rx(struct ieee802154_dev *dev, struct sk_buff *skb, u8 lqi)
+{
+ if (skb)
+ mac802154_subif_rx(dev, skb, lqi);
+}
+EXPORT_SYMBOL(mac802154_rx);
--
1.7.2.3
--
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