mac802154: RX data path

Main RX data path implementation between physical and mac layers.

Signed-off-by: Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 113 insertions, 0 deletions

diff --git a/net/mac802154/rx.c b/net/mac802154/rx.c
new file mode 100644
index 000000000000..d15738fae551
--- /dev/null
+++ b/net/mac802154/rx.c
@@ -0,0 +1,113 @@
+/*
+ * 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 */
+        }
+
+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);