Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / mac802154 / tx.c

diff --git a/kernel/net/mac802154/tx.c b/kernel/net/mac802154/tx.c
new file mode 100644 (file)
index 0000000..c62e956
--- /dev/null
+++ b/kernel/net/mac802154/tx.c
@@ -0,0 +1,149 @@
+/*
+ * Copyright 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.
+ *
+ * Written by:
+ * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
+ * Sergey Lapin <slapin@ossfans.org>
+ * Maxim Gorbachyov <maxim.gorbachev@siemens.com>
+ * Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
+ */
+
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/crc-ccitt.h>
+#include <asm/unaligned.h>
+
+#include <net/rtnetlink.h>
+#include <net/ieee802154_netdev.h>
+#include <net/mac802154.h>
+#include <net/cfg802154.h>
+
+#include "ieee802154_i.h"
+#include "driver-ops.h"
+
+/* IEEE 802.15.4 transceivers can sleep during the xmit session, so process
+ * packets through the workqueue.
+ */
+struct ieee802154_xmit_cb {
+       struct sk_buff *skb;
+       struct work_struct work;
+       struct ieee802154_local *local;
+};
+
+static struct ieee802154_xmit_cb ieee802154_xmit_cb;
+
+static void ieee802154_xmit_worker(struct work_struct *work)
+{
+       struct ieee802154_xmit_cb *cb =
+               container_of(work, struct ieee802154_xmit_cb, work);
+       struct ieee802154_local *local = cb->local;
+       struct sk_buff *skb = cb->skb;
+       struct net_device *dev = skb->dev;
+       int res;
+
+       rtnl_lock();
+
+       /* check if ifdown occurred while schedule */
+       if (!netif_running(dev))
+               goto err_tx;
+
+       res = drv_xmit_sync(local, skb);
+       if (res)
+               goto err_tx;
+
+       ieee802154_xmit_complete(&local->hw, skb, false);
+
+       dev->stats.tx_packets++;
+       dev->stats.tx_bytes += skb->len;
+
+       rtnl_unlock();
+
+       return;
+
+err_tx:
+       /* Restart the netif queue on each sub_if_data object. */
+       ieee802154_wake_queue(&local->hw);
+       rtnl_unlock();
+       kfree_skb(skb);
+       netdev_dbg(dev, "transmission failed\n");
+}
+
+static netdev_tx_t
+ieee802154_tx(struct ieee802154_local *local, struct sk_buff *skb)
+{
+       struct net_device *dev = skb->dev;
+       int ret;
+
+       if (!(local->hw.flags & IEEE802154_HW_TX_OMIT_CKSUM)) {
+               u16 crc = crc_ccitt(0, skb->data, skb->len);
+
+               put_unaligned_le16(crc, skb_put(skb, 2));
+       }
+
+       if (skb_cow_head(skb, local->hw.extra_tx_headroom))
+               goto err_tx;
+
+       /* Stop the netif queue on each sub_if_data object. */
+       ieee802154_stop_queue(&local->hw);
+
+       /* async is priority, otherwise sync is fallback */
+       if (local->ops->xmit_async) {
+               ret = drv_xmit_async(local, skb);
+               if (ret) {
+                       ieee802154_wake_queue(&local->hw);
+                       goto err_tx;
+               }
+
+               dev->stats.tx_packets++;
+               dev->stats.tx_bytes += skb->len;
+       } else {
+               INIT_WORK(&ieee802154_xmit_cb.work, ieee802154_xmit_worker);
+               ieee802154_xmit_cb.skb = skb;
+               ieee802154_xmit_cb.local = local;
+
+               queue_work(local->workqueue, &ieee802154_xmit_cb.work);
+       }
+
+       return NETDEV_TX_OK;
+
+err_tx:
+       kfree_skb(skb);
+       return NETDEV_TX_OK;
+}
+
+netdev_tx_t
+ieee802154_monitor_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+       struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
+
+       skb->skb_iif = dev->ifindex;
+
+       return ieee802154_tx(sdata->local, skb);
+}
+
+netdev_tx_t
+ieee802154_subif_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+       struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev);
+       int rc;
+
+       rc = mac802154_llsec_encrypt(&sdata->sec, skb);
+       if (rc) {
+               netdev_warn(dev, "encryption failed: %i\n", rc);
+               kfree_skb(skb);
+               return NETDEV_TX_OK;
+       }
+
+       skb->skb_iif = dev->ifindex;
+
+       return ieee802154_tx(sdata->local, skb);
+}