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diff --git a/net/irda/irlan/irlan_eth.c b/net/irda/irlan/irlan_eth.c
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+/*********************************************************************
+ *
+ * Filename: irlan_eth.c
+ * Version:
+ * Description:
+ * Status: Experimental.
+ * Author: Dag Brattli <dagb@cs.uit.no>
+ * Created at: Thu Oct 15 08:37:58 1998
+ * Modified at: Tue Mar 21 09:06:41 2000
+ * Modified by: Dag Brattli <dagb@cs.uit.no>
+ * Sources: skeleton.c by Donald Becker <becker@CESDIS.gsfc.nasa.gov>
+ * slip.c by Laurence Culhane, <loz@holmes.demon.co.uk>
+ * Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
+ *
+ * Copyright (c) 1998-2000 Dag Brattli, All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * Neither Dag Brattli nor University of Tromsų admit liability nor
+ * provide warranty for any of this software. This material is
+ * provided "AS-IS" and at no charge.
+ *
+ ********************************************************************/
+
+#include <linux/config.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/if_arp.h>
+#include <linux/module.h>
+#include <net/arp.h>
+
+#include <net/irda/irda.h>
+#include <net/irda/irmod.h>
+#include <net/irda/irlan_common.h>
+#include <net/irda/irlan_client.h>
+#include <net/irda/irlan_event.h>
+#include <net/irda/irlan_eth.h>
+
+static int irlan_eth_open(struct net_device *dev);
+static int irlan_eth_close(struct net_device *dev);
+static int irlan_eth_xmit(struct sk_buff *skb, struct net_device *dev);
+static void irlan_eth_set_multicast_list( struct net_device *dev);
+static struct net_device_stats *irlan_eth_get_stats(struct net_device *dev);
+
+/*
+ * Function irlan_eth_setup (dev)
+ *
+ * The network device initialization function.
+ *
+ */
+static void irlan_eth_setup(struct net_device *dev)
+{
+ dev->open = irlan_eth_open;
+ dev->stop = irlan_eth_close;
+ dev->hard_start_xmit = irlan_eth_xmit;
+ dev->get_stats = irlan_eth_get_stats;
+ dev->set_multicast_list = irlan_eth_set_multicast_list;
+ dev->destructor = free_netdev;
+
+ SET_MODULE_OWNER(dev);
+
+ ether_setup(dev);
+
+ /*
+ * Lets do all queueing in IrTTP instead of this device driver.
+ * Queueing here as well can introduce some strange latency
+ * problems, which we will avoid by setting the queue size to 0.
+ */
+ /*
+ * The bugs in IrTTP and IrLAN that created this latency issue
+ * have now been fixed, and we can propagate flow control properly
+ * to the network layer. However, this requires a minimal queue of
+ * packets for the device.
+ * Without flow control, the Tx Queue is 14 (ttp) + 0 (dev) = 14
+ * With flow control, the Tx Queue is 7 (ttp) + 4 (dev) = 11
+ * See irlan_eth_flow_indication()...
+ * Note : this number was randomly selected and would need to
+ * be adjusted.
+ * Jean II */
+ dev->tx_queue_len = 4;
+}
+
+/*
+ * Function alloc_irlandev
+ *
+ * Allocate network device and control block
+ *
+ */
+struct net_device *alloc_irlandev(const char *name)
+{
+ return alloc_netdev(sizeof(struct irlan_cb), name,
+ irlan_eth_setup);
+}
+
+/*
+ * Function irlan_eth_open (dev)
+ *
+ * Network device has been opened by user
+ *
+ */
+static int irlan_eth_open(struct net_device *dev)
+{
+ struct irlan_cb *self = netdev_priv(dev);
+
+ IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
+
+ /* Ready to play! */
+ netif_stop_queue(dev); /* Wait until data link is ready */
+
+ /* We are now open, so time to do some work */
+ self->disconnect_reason = 0;
+ irlan_client_wakeup(self, self->saddr, self->daddr);
+
+ /* Make sure we have a hardware address before we return,
+ so DHCP clients gets happy */
+ return wait_event_interruptible(self->open_wait,
+ !self->tsap_data->connected);
+}
+
+/*
+ * Function irlan_eth_close (dev)
+ *
+ * Stop the ether network device, his function will usually be called by
+ * ifconfig down. We should now disconnect the link, We start the
+ * close timer, so that the instance will be removed if we are unable
+ * to discover the remote device after the disconnect.
+ */
+static int irlan_eth_close(struct net_device *dev)
+{
+ struct irlan_cb *self = netdev_priv(dev);
+
+ IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
+
+ /* Stop device */
+ netif_stop_queue(dev);
+
+ irlan_close_data_channel(self);
+ irlan_close_tsaps(self);
+
+ irlan_do_client_event(self, IRLAN_LMP_DISCONNECT, NULL);
+ irlan_do_provider_event(self, IRLAN_LMP_DISCONNECT, NULL);
+
+ /* Remove frames queued on the control channel */
+ skb_queue_purge(&self->client.txq);
+
+ self->client.tx_busy = 0;
+
+ return 0;
+}
+
+/*
+ * Function irlan_eth_tx (skb)
+ *
+ * Transmits ethernet frames over IrDA link.
+ *
+ */
+static int irlan_eth_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct irlan_cb *self = netdev_priv(dev);
+ int ret;
+
+ /* skb headroom large enough to contain all IrDA-headers? */
+ if ((skb_headroom(skb) < self->max_header_size) || (skb_shared(skb))) {
+ struct sk_buff *new_skb =
+ skb_realloc_headroom(skb, self->max_header_size);
+
+ /* We have to free the original skb anyway */
+ dev_kfree_skb(skb);
+
+ /* Did the realloc succeed? */
+ if (new_skb == NULL)
+ return 0;
+
+ /* Use the new skb instead */
+ skb = new_skb;
+ }
+
+ dev->trans_start = jiffies;
+
+ /* Now queue the packet in the transport layer */
+ if (self->use_udata)
+ ret = irttp_udata_request(self->tsap_data, skb);
+ else
+ ret = irttp_data_request(self->tsap_data, skb);
+
+ if (ret < 0) {
+ /*
+ * IrTTPs tx queue is full, so we just have to
+ * drop the frame! You might think that we should
+ * just return -1 and don't deallocate the frame,
+ * but that is dangerous since it's possible that
+ * we have replaced the original skb with a new
+ * one with larger headroom, and that would really
+ * confuse do_dev_queue_xmit() in dev.c! I have
+ * tried :-) DB
+ */
+ /* irttp_data_request already free the packet */
+ self->stats.tx_dropped++;
+ } else {
+ self->stats.tx_packets++;
+ self->stats.tx_bytes += skb->len;
+ }
+
+ return 0;
+}
+
+/*
+ * Function irlan_eth_receive (handle, skb)
+ *
+ * This function gets the data that is received on the data channel
+ *
+ */
+int irlan_eth_receive(void *instance, void *sap, struct sk_buff *skb)
+{
+ struct irlan_cb *self = instance;
+
+ if (skb == NULL) {
+ ++self->stats.rx_dropped;
+ return 0;
+ }
+ if (skb->len < ETH_HLEN) {
+ IRDA_DEBUG(0, "%s() : IrLAN frame too short (%d)\n",
+ __FUNCTION__, skb->len);
+ ++self->stats.rx_dropped;
+ dev_kfree_skb(skb);
+ return 0;
+ }
+
+ /*
+ * Adopt this frame! Important to set all these fields since they
+ * might have been previously set by the low level IrDA network
+ * device driver
+ */
+ skb->dev = self->dev;
+ skb->protocol=eth_type_trans(skb, skb->dev); /* Remove eth header */
+
+ self->stats.rx_packets++;
+ self->stats.rx_bytes += skb->len;
+
+ netif_rx(skb); /* Eat it! */
+
+ return 0;
+}
+
+/*
+ * Function irlan_eth_flow (status)
+ *
+ * Do flow control between IP/Ethernet and IrLAN/IrTTP. This is done by
+ * controlling the queue stop/start.
+ *
+ * The IrDA link layer has the advantage to have flow control, and
+ * IrTTP now properly handles that. Flow controlling the higher layers
+ * prevent us to drop Tx packets in here (up to 15% for a TCP socket,
+ * more for UDP socket).
+ * Also, this allow us to reduce the overall transmit queue, which means
+ * less latency in case of mixed traffic.
+ * Jean II
+ */
+void irlan_eth_flow_indication(void *instance, void *sap, LOCAL_FLOW flow)
+{
+ struct irlan_cb *self;
+ struct net_device *dev;
+
+ self = (struct irlan_cb *) instance;
+
+ IRDA_ASSERT(self != NULL, return;);
+ IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
+
+ dev = self->dev;
+
+ IRDA_ASSERT(dev != NULL, return;);
+
+ IRDA_DEBUG(0, "%s() : flow %s ; running %d\n", __FUNCTION__,
+ flow == FLOW_STOP ? "FLOW_STOP" : "FLOW_START",
+ netif_running(dev));
+
+ switch (flow) {
+ case FLOW_STOP:
+ /* IrTTP is full, stop higher layers */
+ netif_stop_queue(dev);
+ break;
+ case FLOW_START:
+ default:
+ /* Tell upper layers that its time to transmit frames again */
+ /* Schedule network layer */
+ netif_wake_queue(dev);
+ break;
+ }
+}
+
+/*
+ * Function irlan_etc_send_gratuitous_arp (dev)
+ *
+ * Send gratuitous ARP to announce that we have changed
+ * hardware address, so that all peers updates their ARP tables
+ */
+void irlan_eth_send_gratuitous_arp(struct net_device *dev)
+{
+ struct in_device *in_dev;
+
+ /*
+ * When we get a new MAC address do a gratuitous ARP. This
+ * is useful if we have changed access points on the same
+ * subnet.
+ */
+#ifdef CONFIG_INET
+ IRDA_DEBUG(4, "IrLAN: Sending gratuitous ARP\n");
+ rcu_read_lock();
+ in_dev = __in_dev_get(dev);
+ if (in_dev == NULL)
+ goto out;
+ if (in_dev->ifa_list)
+
+ arp_send(ARPOP_REQUEST, ETH_P_ARP,
+ in_dev->ifa_list->ifa_address,
+ dev,
+ in_dev->ifa_list->ifa_address,
+ NULL, dev->dev_addr, NULL);
+out:
+ rcu_read_unlock();
+#endif /* CONFIG_INET */
+}
+
+/*
+ * Function set_multicast_list (dev)
+ *
+ * Configure the filtering of the device
+ *
+ */
+#define HW_MAX_ADDRS 4 /* Must query to get it! */
+static void irlan_eth_set_multicast_list(struct net_device *dev)
+{
+ struct irlan_cb *self = netdev_priv(dev);
+
+ IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
+
+ /* Check if data channel has been connected yet */
+ if (self->client.state != IRLAN_DATA) {
+ IRDA_DEBUG(1, "%s(), delaying!\n", __FUNCTION__ );
+ return;
+ }
+
+ if (dev->flags & IFF_PROMISC) {
+ /* Enable promiscuous mode */
+ IRDA_WARNING("Promiscous mode not implemented by IrLAN!\n");
+ }
+ else if ((dev->flags & IFF_ALLMULTI) || dev->mc_count > HW_MAX_ADDRS) {
+ /* Disable promiscuous mode, use normal mode. */
+ IRDA_DEBUG(4, "%s(), Setting multicast filter\n", __FUNCTION__ );
+ /* hardware_set_filter(NULL); */
+
+ irlan_set_multicast_filter(self, TRUE);
+ }
+ else if (dev->mc_count) {
+ IRDA_DEBUG(4, "%s(), Setting multicast filter\n", __FUNCTION__ );
+ /* Walk the address list, and load the filter */
+ /* hardware_set_filter(dev->mc_list); */
+
+ irlan_set_multicast_filter(self, TRUE);
+ }
+ else {
+ IRDA_DEBUG(4, "%s(), Clearing multicast filter\n", __FUNCTION__ );
+ irlan_set_multicast_filter(self, FALSE);
+ }
+
+ if (dev->flags & IFF_BROADCAST)
+ irlan_set_broadcast_filter(self, TRUE);
+ else
+ irlan_set_broadcast_filter(self, FALSE);
+}
+
+/*
+ * Function irlan_get_stats (dev)
+ *
+ * Get the current statistics for this device
+ *
+ */
+static struct net_device_stats *irlan_eth_get_stats(struct net_device *dev)
+{
+ struct irlan_cb *self = netdev_priv(dev);
+
+ return &self->stats;
+}
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