Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2149 insertions, 0 deletions

diff --git a/drivers/s390/net/netiucv.c b/drivers/s390/net/netiucv.c
new file mode 100644
index 000000000000..16e8e69afb10
--- /dev/null
+++ b/drivers/s390/net/netiucv.c
@@ -0,0 +1,2149 @@
+/*
+ * $Id: netiucv.c,v 1.63 2004/07/27 13:36:05 mschwide Exp $
+ *
+ * IUCV network driver
+ *
+ * Copyright (C) 2001 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Author(s): Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com)
+ *
+ * Driverfs integration and all bugs therein by Cornelia Huck(cohuck@de.ibm.com)
+ *
+ * Documentation used:
+ *  the source of the original IUCV driver by:
+ *    Stefan Hegewald <hegewald@de.ibm.com>
+ *    Hartmut Penner <hpenner@de.ibm.com>
+ *    Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
+ *    Martin Schwidefsky (schwidefsky@de.ibm.com)
+ *    Alan Altmark (Alan_Altmark@us.ibm.com)  Sept. 2000
+ *
+ * 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, or (at your option)
+ * any later version.
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * RELEASE-TAG: IUCV network driver $Revision: 1.63 $
+ *
+ */
+
+#undef DEBUG
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/timer.h>
+#include <linux/sched.h>
+#include <linux/bitops.h>
+
+#include <linux/signal.h>
+#include <linux/string.h>
+#include <linux/device.h>
+
+#include <linux/ip.h>
+#include <linux/if_arp.h>
+#include <linux/tcp.h>
+#include <linux/skbuff.h>
+#include <linux/ctype.h>
+#include <net/dst.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+
+#include "iucv.h"
+#include "fsm.h"
+
+MODULE_AUTHOR
+    ("(C) 2001 IBM Corporation by Fritz Elfert (felfert@millenux.com)");
+MODULE_DESCRIPTION ("Linux for S/390 IUCV network driver");
+
+
+#define PRINTK_HEADER " iucv: "       /* for debugging */
+
+static struct device_driver netiucv_driver = {
+	.name = "netiucv",
+	.bus  = &iucv_bus,
+};
+
+/**
+ * Per connection profiling data
+ */
+struct connection_profile {
+	unsigned long maxmulti;
+	unsigned long maxcqueue;
+	unsigned long doios_single;
+	unsigned long doios_multi;
+	unsigned long txlen;
+	unsigned long tx_time;
+	struct timespec send_stamp;
+	unsigned long tx_pending;
+	unsigned long tx_max_pending;
+};
+
+/**
+ * Representation of one iucv connection
+ */
+struct iucv_connection {
+	struct iucv_connection    *next;
+	iucv_handle_t             handle;
+	__u16                     pathid;
+	struct sk_buff            *rx_buff;
+	struct sk_buff            *tx_buff;
+	struct sk_buff_head       collect_queue;
+	struct sk_buff_head	  commit_queue;
+	spinlock_t                collect_lock;
+	int                       collect_len;
+	int                       max_buffsize;
+	fsm_timer                 timer;
+	fsm_instance              *fsm;
+	struct net_device         *netdev;
+	struct connection_profile prof;
+	char                      userid[9];
+};
+
+/**
+ * Linked list of all connection structs.
+ */
+static struct iucv_connection *iucv_connections;
+
+/**
+ * Representation of event-data for the
+ * connection state machine.
+ */
+struct iucv_event {
+	struct iucv_connection *conn;
+	void                   *data;
+};
+
+/**
+ * Private part of the network device structure
+ */
+struct netiucv_priv {
+	struct net_device_stats stats;
+	unsigned long           tbusy;
+	fsm_instance            *fsm;
+        struct iucv_connection  *conn;
+	struct device           *dev;
+};
+
+/**
+ * Link level header for a packet.
+ */
+typedef struct ll_header_t {
+	__u16 next;
+} ll_header;
+
+#define NETIUCV_HDRLEN           (sizeof(ll_header))
+#define NETIUCV_BUFSIZE_MAX      32768
+#define NETIUCV_BUFSIZE_DEFAULT  NETIUCV_BUFSIZE_MAX
+#define NETIUCV_MTU_MAX          (NETIUCV_BUFSIZE_MAX - NETIUCV_HDRLEN)
+#define NETIUCV_MTU_DEFAULT      9216
+#define NETIUCV_QUEUELEN_DEFAULT 50
+#define NETIUCV_TIMEOUT_5SEC     5000
+
+/**
+ * Compatibility macros for busy handling
+ * of network devices.
+ */
+static __inline__ void netiucv_clear_busy(struct net_device *dev)
+{
+	clear_bit(0, &(((struct netiucv_priv *)dev->priv)->tbusy));
+	netif_wake_queue(dev);
+}
+
+static __inline__ int netiucv_test_and_set_busy(struct net_device *dev)
+{
+	netif_stop_queue(dev);
+	return test_and_set_bit(0, &((struct netiucv_priv *)dev->priv)->tbusy);
+}
+
+static __u8 iucv_host[8] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+static __u8 iucvMagic[16] = {
+	0xF0, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,
+	0xF0, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40
+};
+
+/**
+ * This mask means the 16-byte IUCV "magic" and the origin userid must
+ * match exactly as specified in order to give connection_pending()
+ * control.
+ */
+static __u8 netiucv_mask[] = {
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
+};
+
+/**
+ * Convert an iucv userId to its printable
+ * form (strip whitespace at end).
+ *
+ * @param An iucv userId
+ *
+ * @returns The printable string (static data!!)
+ */
+static __inline__ char *
+netiucv_printname(char *name)
+{
+	static char tmp[9];
+	char *p = tmp;
+	memcpy(tmp, name, 8);
+	tmp[8] = '\0';
+	while (*p && (!isspace(*p)))
+		p++;
+	*p = '\0';
+	return tmp;
+}
+
+/**
+ * States of the interface statemachine.
+ */
+enum dev_states {
+	DEV_STATE_STOPPED,
+	DEV_STATE_STARTWAIT,
+	DEV_STATE_STOPWAIT,
+	DEV_STATE_RUNNING,
+	/**
+	 * MUST be always the last element!!
+	 */
+	NR_DEV_STATES
+};
+
+static const char *dev_state_names[] = {
+	"Stopped",
+	"StartWait",
+	"StopWait",
+	"Running",
+};
+
+/**
+ * Events of the interface statemachine.
+ */
+enum dev_events {
+	DEV_EVENT_START,
+	DEV_EVENT_STOP,
+	DEV_EVENT_CONUP,
+	DEV_EVENT_CONDOWN,
+	/**
+	 * MUST be always the last element!!
+	 */
+	NR_DEV_EVENTS
+};
+
+static const char *dev_event_names[] = {
+	"Start",
+	"Stop",
+	"Connection up",
+	"Connection down",
+};
+
+/**
+ * Events of the connection statemachine
+ */
+enum conn_events {
+	/**
+	 * Events, representing callbacks from
+	 * lowlevel iucv layer)
+	 */
+	CONN_EVENT_CONN_REQ,
+	CONN_EVENT_CONN_ACK,
+	CONN_EVENT_CONN_REJ,
+	CONN_EVENT_CONN_SUS,
+	CONN_EVENT_CONN_RES,
+	CONN_EVENT_RX,
+	CONN_EVENT_TXDONE,
+
+	/**
+	 * Events, representing errors return codes from
+	 * calls to lowlevel iucv layer
+	 */
+
+	/**
+	 * Event, representing timer expiry.
+	 */
+	CONN_EVENT_TIMER,
+
+	/**
+	 * Events, representing commands from upper levels.
+	 */
+	CONN_EVENT_START,
+	CONN_EVENT_STOP,
+
+	/**
+	 * MUST be always the last element!!
+	 */
+	NR_CONN_EVENTS,
+};
+
+static const char *conn_event_names[] = {
+	"Remote connection request",
+	"Remote connection acknowledge",
+	"Remote connection reject",
+	"Connection suspended",
+	"Connection resumed",
+	"Data received",
+	"Data sent",
+
+	"Timer",
+
+	"Start",
+	"Stop",
+};
+
+/**
+ * States of the connection statemachine.
+ */
+enum conn_states {
+	/**
+	 * Connection not assigned to any device,
+	 * initial state, invalid
+	 */
+	CONN_STATE_INVALID,
+
+	/**
+	 * Userid assigned but not operating
+	 */
+	CONN_STATE_STOPPED,
+
+	/**
+	 * Connection registered,
+	 * no connection request sent yet,
+	 * no connection request received
+	 */
+	CONN_STATE_STARTWAIT,
+
+	/**
+	 * Connection registered and connection request sent,
+	 * no acknowledge and no connection request received yet.
+	 */
+	CONN_STATE_SETUPWAIT,
+
+	/**
+	 * Connection up and running idle
+	 */
+	CONN_STATE_IDLE,
+
+	/**
+	 * Data sent, awaiting CONN_EVENT_TXDONE
+	 */
+	CONN_STATE_TX,
+
+	/**
+	 * Error during registration.
+	 */
+	CONN_STATE_REGERR,
+
+	/**
+	 * Error during registration.
+	 */
+	CONN_STATE_CONNERR,
+
+	/**
+	 * MUST be always the last element!!
+	 */
+	NR_CONN_STATES,
+};
+
+static const char *conn_state_names[] = {
+	"Invalid",
+	"Stopped",
+	"StartWait",
+	"SetupWait",
+	"Idle",
+	"TX",
+	"Terminating",
+	"Registration error",
+	"Connect error",
+};
+
+
+/**
+ * Debug Facility Stuff
+ */
+static debug_info_t *iucv_dbf_setup = NULL;
+static debug_info_t *iucv_dbf_data = NULL;
+static debug_info_t *iucv_dbf_trace = NULL;
+
+DEFINE_PER_CPU(char[256], iucv_dbf_txt_buf);
+
+static void
+iucv_unregister_dbf_views(void)
+{
+	if (iucv_dbf_setup)
+		debug_unregister(iucv_dbf_setup);
+	if (iucv_dbf_data)
+		debug_unregister(iucv_dbf_data);
+	if (iucv_dbf_trace)
+		debug_unregister(iucv_dbf_trace);
+}
+static int
+iucv_register_dbf_views(void)
+{
+	iucv_dbf_setup = debug_register(IUCV_DBF_SETUP_NAME,
+					IUCV_DBF_SETUP_INDEX,
+					IUCV_DBF_SETUP_NR_AREAS,
+					IUCV_DBF_SETUP_LEN);
+	iucv_dbf_data = debug_register(IUCV_DBF_DATA_NAME,
+				       IUCV_DBF_DATA_INDEX,
+				       IUCV_DBF_DATA_NR_AREAS,
+				       IUCV_DBF_DATA_LEN);
+	iucv_dbf_trace = debug_register(IUCV_DBF_TRACE_NAME,
+					IUCV_DBF_TRACE_INDEX,
+					IUCV_DBF_TRACE_NR_AREAS,
+					IUCV_DBF_TRACE_LEN);
+
+	if ((iucv_dbf_setup == NULL) || (iucv_dbf_data == NULL) ||
+	    (iucv_dbf_trace == NULL)) {
+		iucv_unregister_dbf_views();
+		return -ENOMEM;
+	}
+	debug_register_view(iucv_dbf_setup, &debug_hex_ascii_view);
+	debug_set_level(iucv_dbf_setup, IUCV_DBF_SETUP_LEVEL);
+
+	debug_register_view(iucv_dbf_data, &debug_hex_ascii_view);
+	debug_set_level(iucv_dbf_data, IUCV_DBF_DATA_LEVEL);
+
+	debug_register_view(iucv_dbf_trace, &debug_hex_ascii_view);
+	debug_set_level(iucv_dbf_trace, IUCV_DBF_TRACE_LEVEL);
+
+	return 0;
+}
+
+/**
+ * Callback-wrappers, called from lowlevel iucv layer.
+ *****************************************************************************/
+
+static void
+netiucv_callback_rx(iucv_MessagePending *eib, void *pgm_data)
+{
+	struct iucv_connection *conn = (struct iucv_connection *)pgm_data;
+	struct iucv_event ev;
+
+	ev.conn = conn;
+	ev.data = (void *)eib;
+
+	fsm_event(conn->fsm, CONN_EVENT_RX, &ev);
+}
+
+static void
+netiucv_callback_txdone(iucv_MessageComplete *eib, void *pgm_data)
+{
+	struct iucv_connection *conn = (struct iucv_connection *)pgm_data;
+	struct iucv_event ev;
+
+	ev.conn = conn;
+	ev.data = (void *)eib;
+	fsm_event(conn->fsm, CONN_EVENT_TXDONE, &ev);
+}
+
+static void
+netiucv_callback_connack(iucv_ConnectionComplete *eib, void *pgm_data)
+{
+	struct iucv_connection *conn = (struct iucv_connection *)pgm_data;
+	struct iucv_event ev;
+
+	ev.conn = conn;
+	ev.data = (void *)eib;
+	fsm_event(conn->fsm, CONN_EVENT_CONN_ACK, &ev);
+}
+
+static void
+netiucv_callback_connreq(iucv_ConnectionPending *eib, void *pgm_data)
+{
+	struct iucv_connection *conn = (struct iucv_connection *)pgm_data;
+	struct iucv_event ev;
+
+	ev.conn = conn;
+	ev.data = (void *)eib;
+	fsm_event(conn->fsm, CONN_EVENT_CONN_REQ, &ev);
+}
+
+static void
+netiucv_callback_connrej(iucv_ConnectionSevered *eib, void *pgm_data)
+{
+	struct iucv_connection *conn = (struct iucv_connection *)pgm_data;
+	struct iucv_event ev;
+
+	ev.conn = conn;
+	ev.data = (void *)eib;
+	fsm_event(conn->fsm, CONN_EVENT_CONN_REJ, &ev);
+}
+
+static void
+netiucv_callback_connsusp(iucv_ConnectionQuiesced *eib, void *pgm_data)
+{
+	struct iucv_connection *conn = (struct iucv_connection *)pgm_data;
+	struct iucv_event ev;
+
+	ev.conn = conn;
+	ev.data = (void *)eib;
+	fsm_event(conn->fsm, CONN_EVENT_CONN_SUS, &ev);
+}
+
+static void
+netiucv_callback_connres(iucv_ConnectionResumed *eib, void *pgm_data)
+{
+	struct iucv_connection *conn = (struct iucv_connection *)pgm_data;
+	struct iucv_event ev;
+
+	ev.conn = conn;
+	ev.data = (void *)eib;
+	fsm_event(conn->fsm, CONN_EVENT_CONN_RES, &ev);
+}
+
+static iucv_interrupt_ops_t netiucv_ops = {
+	.ConnectionPending  = netiucv_callback_connreq,
+	.ConnectionComplete = netiucv_callback_connack,
+	.ConnectionSevered  = netiucv_callback_connrej,
+	.ConnectionQuiesced = netiucv_callback_connsusp,
+	.ConnectionResumed  = netiucv_callback_connres,
+	.MessagePending     = netiucv_callback_rx,
+	.MessageComplete    = netiucv_callback_txdone
+};
+
+/**
+ * Dummy NOP action for all statemachines
+ */
+static void
+fsm_action_nop(fsm_instance *fi, int event, void *arg)
+{
+}
+
+/**
+ * Actions of the connection statemachine
+ *****************************************************************************/
+
+/**
+ * Helper function for conn_action_rx()
+ * Unpack a just received skb and hand it over to
+ * upper layers.
+ *
+ * @param conn The connection where this skb has been received.
+ * @param pskb The received skb.
+ */
+//static __inline__ void
+static void
+netiucv_unpack_skb(struct iucv_connection *conn, struct sk_buff *pskb)
+{
+	struct net_device     *dev = conn->netdev;
+	struct netiucv_priv   *privptr = dev->priv;
+	__u16          offset = 0;
+
+	skb_put(pskb, NETIUCV_HDRLEN);
+	pskb->dev = dev;
+	pskb->ip_summed = CHECKSUM_NONE;
+	pskb->protocol = ntohs(ETH_P_IP);
+
+	while (1) {
+		struct sk_buff *skb;
+		ll_header *header = (ll_header *)pskb->data;
+
+		if (!header->next)
+			break;
+
+		skb_pull(pskb, NETIUCV_HDRLEN);
+		header->next -= offset;
+		offset += header->next;
+		header->next -= NETIUCV_HDRLEN;
+		if (skb_tailroom(pskb) < header->next) {
+			PRINT_WARN("%s: Illegal next field in iucv header: "
+			       "%d > %d\n",
+			       dev->name, header->next, skb_tailroom(pskb));
+			IUCV_DBF_TEXT_(data, 2, "Illegal next field: %d > %d\n",
+				header->next, skb_tailroom(pskb));
+			return;
+		}
+		skb_put(pskb, header->next);
+		pskb->mac.raw = pskb->data;
+		skb = dev_alloc_skb(pskb->len);
+		if (!skb) {
+			PRINT_WARN("%s Out of memory in netiucv_unpack_skb\n",
+			       dev->name);
+			IUCV_DBF_TEXT(data, 2,
+				"Out of memory in netiucv_unpack_skb\n");
+			privptr->stats.rx_dropped++;
+			return;
+		}
+		memcpy(skb_put(skb, pskb->len), pskb->data, pskb->len);
+		skb->mac.raw = skb->data;
+		skb->dev = pskb->dev;
+		skb->protocol = pskb->protocol;
+		pskb->ip_summed = CHECKSUM_UNNECESSARY;
+		/*
+		 * Since receiving is always initiated from a tasklet (in iucv.c),
+		 * we must use netif_rx_ni() instead of netif_rx()
+		 */
+		netif_rx_ni(skb);
+		dev->last_rx = jiffies;
+		privptr->stats.rx_packets++;
+		privptr->stats.rx_bytes += skb->len;
+		skb_pull(pskb, header->next);
+		skb_put(pskb, NETIUCV_HDRLEN);
+	}
+}
+
+static void
+conn_action_rx(fsm_instance *fi, int event, void *arg)
+{
+	struct iucv_event *ev = (struct iucv_event *)arg;
+	struct iucv_connection *conn = ev->conn;
+	iucv_MessagePending *eib = (iucv_MessagePending *)ev->data;
+	struct netiucv_priv *privptr =(struct netiucv_priv *)conn->netdev->priv;
+
+	__u32 msglen = eib->ln1msg2.ipbfln1f;
+	int rc;
+
+	IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
+
+	if (!conn->netdev) {
+		/* FRITZ: How to tell iucv LL to drop the msg? */
+		PRINT_WARN("Received data for unlinked connection\n");
+		IUCV_DBF_TEXT(data, 2,
+			"Received data for unlinked connection\n");
+		return;
+	}
+	if (msglen > conn->max_buffsize) {
+		/* FRITZ: How to tell iucv LL to drop the msg? */
+		privptr->stats.rx_dropped++;
+		PRINT_WARN("msglen %d > max_buffsize %d\n",
+			msglen, conn->max_buffsize);
+		IUCV_DBF_TEXT_(data, 2, "msglen %d > max_buffsize %d\n",
+			msglen, conn->max_buffsize);
+		return;
+	}
+	conn->rx_buff->data = conn->rx_buff->tail = conn->rx_buff->head;
+	conn->rx_buff->len = 0;
+	rc = iucv_receive(conn->pathid, eib->ipmsgid, eib->iptrgcls,
+			  conn->rx_buff->data, msglen, NULL, NULL, NULL);
+	if (rc || msglen < 5) {
+		privptr->stats.rx_errors++;
+		PRINT_WARN("iucv_receive returned %08x\n", rc);
+		IUCV_DBF_TEXT_(data, 2, "rc %d from iucv_receive\n", rc);
+		return;
+	}
+	netiucv_unpack_skb(conn, conn->rx_buff);
+}
+
+static void
+conn_action_txdone(fsm_instance *fi, int event, void *arg)
+{
+	struct iucv_event *ev = (struct iucv_event *)arg;
+	struct iucv_connection *conn = ev->conn;
+	iucv_MessageComplete *eib = (iucv_MessageComplete *)ev->data;
+	struct netiucv_priv *privptr = NULL;
+			         /* Shut up, gcc! skb is always below 2G. */
+	__u32 single_flag = eib->ipmsgtag;
+	__u32 txbytes = 0;
+	__u32 txpackets = 0;
+	__u32 stat_maxcq = 0;
+	struct sk_buff *skb;
+	unsigned long saveflags;
+	ll_header header;
+
+	IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
+
+	if (conn && conn->netdev && conn->netdev->priv)
+		privptr = (struct netiucv_priv *)conn->netdev->priv;
+	conn->prof.tx_pending--;
+	if (single_flag) {
+		if ((skb = skb_dequeue(&conn->commit_queue))) {
+			atomic_dec(&skb->users);
+			dev_kfree_skb_any(skb);
+			if (privptr) {
+				privptr->stats.tx_packets++;
+				privptr->stats.tx_bytes +=
+					(skb->len - NETIUCV_HDRLEN
+					 	  - NETIUCV_HDRLEN);
+			}
+		}
+	}
+	conn->tx_buff->data = conn->tx_buff->tail = conn->tx_buff->head;
+	conn->tx_buff->len = 0;
+	spin_lock_irqsave(&conn->collect_lock, saveflags);
+	while ((skb = skb_dequeue(&conn->collect_queue))) {
+		header.next = conn->tx_buff->len + skb->len + NETIUCV_HDRLEN;
+		memcpy(skb_put(conn->tx_buff, NETIUCV_HDRLEN), &header,
+		       NETIUCV_HDRLEN);
+		memcpy(skb_put(conn->tx_buff, skb->len), skb->data, skb->len);
+		txbytes += skb->len;
+		txpackets++;
+		stat_maxcq++;
+		atomic_dec(&skb->users);
+		dev_kfree_skb_any(skb);
+	}
+	if (conn->collect_len > conn->prof.maxmulti)
+		conn->prof.maxmulti = conn->collect_len;
+	conn->collect_len = 0;
+	spin_unlock_irqrestore(&conn->collect_lock, saveflags);
+	if (conn->tx_buff->len) {
+		int rc;
+
+		header.next = 0;
+		memcpy(skb_put(conn->tx_buff, NETIUCV_HDRLEN), &header,
+		       NETIUCV_HDRLEN);
+
+		conn->prof.send_stamp = xtime;
+		rc = iucv_send(conn->pathid, NULL, 0, 0, 0, 0,
+			       conn->tx_buff->data, conn->tx_buff->len);
+		conn->prof.doios_multi++;
+		conn->prof.txlen += conn->tx_buff->len;
+		conn->prof.tx_pending++;
+		if (conn->prof.tx_pending > conn->prof.tx_max_pending)
+			conn->prof.tx_max_pending = conn->prof.tx_pending;
+		if (rc) {
+			conn->prof.tx_pending--;
+			fsm_newstate(fi, CONN_STATE_IDLE);
+			if (privptr)
+				privptr->stats.tx_errors += txpackets;
+			PRINT_WARN("iucv_send returned %08x\n",	rc);
+			IUCV_DBF_TEXT_(data, 2, "rc %d from iucv_send\n", rc);
+		} else {
+			if (privptr) {
+				privptr->stats.tx_packets += txpackets;
+				privptr->stats.tx_bytes += txbytes;
+			}
+			if (stat_maxcq > conn->prof.maxcqueue)
+				conn->prof.maxcqueue = stat_maxcq;
+		}
+	} else
+		fsm_newstate(fi, CONN_STATE_IDLE);
+}
+
+static void
+conn_action_connaccept(fsm_instance *fi, int event, void *arg)
+{
+	struct iucv_event *ev = (struct iucv_event *)arg;
+	struct iucv_connection *conn = ev->conn;
+	iucv_ConnectionPending *eib = (iucv_ConnectionPending *)ev->data;
+	struct net_device *netdev = conn->netdev;
+	struct netiucv_priv *privptr = (struct netiucv_priv *)netdev->priv;
+	int rc;
+	__u16 msglimit;
+	__u8 udata[16];
+
+	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
+
+	rc = iucv_accept(eib->ippathid, NETIUCV_QUEUELEN_DEFAULT, udata, 0,
+			 conn->handle, conn, NULL, &msglimit);
+	if (rc) {
+		PRINT_WARN("%s: IUCV accept failed with error %d\n",
+		       netdev->name, rc);
+		IUCV_DBF_TEXT_(setup, 2, "rc %d from iucv_accept", rc);
+		return;
+	}
+	fsm_newstate(fi, CONN_STATE_IDLE);
+	conn->pathid = eib->ippathid;
+	netdev->tx_queue_len = msglimit;
+	fsm_event(privptr->fsm, DEV_EVENT_CONUP, netdev);
+}
+
+static void
+conn_action_connreject(fsm_instance *fi, int event, void *arg)
+{
+	struct iucv_event *ev = (struct iucv_event *)arg;
+	struct iucv_connection *conn = ev->conn;
+	struct net_device *netdev = conn->netdev;
+	iucv_ConnectionPending *eib = (iucv_ConnectionPending *)ev->data;
+	__u8 udata[16];
+
+	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
+
+	iucv_sever(eib->ippathid, udata);
+	if (eib->ippathid != conn->pathid) {
+		PRINT_INFO("%s: IR Connection Pending; "
+			"pathid %d does not match original pathid %d\n",
+			netdev->name, eib->ippathid, conn->pathid);
+		IUCV_DBF_TEXT_(data, 2,
+			"connreject: IR pathid %d, conn. pathid %d\n",
+			eib->ippathid, conn->pathid);
+		iucv_sever(conn->pathid, udata);
+	}
+}
+
+static void
+conn_action_connack(fsm_instance *fi, int event, void *arg)
+{
+	struct iucv_event *ev = (struct iucv_event *)arg;
+	struct iucv_connection *conn = ev->conn;
+	iucv_ConnectionComplete *eib = (iucv_ConnectionComplete *)ev->data;
+	struct net_device *netdev = conn->netdev;
+	struct netiucv_priv *privptr = (struct netiucv_priv *)netdev->priv;
+
+	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
+
+	fsm_deltimer(&conn->timer);
+	fsm_newstate(fi, CONN_STATE_IDLE);
+	if (eib->ippathid != conn->pathid) {
+		PRINT_INFO("%s: IR Connection Complete; "
+			"pathid %d does not match original pathid %d\n",
+			netdev->name, eib->ippathid, conn->pathid);
+		IUCV_DBF_TEXT_(data, 2,
+			"connack: IR pathid %d, conn. pathid %d\n",
+			eib->ippathid, conn->pathid);
+		conn->pathid = eib->ippathid;
+	}
+	netdev->tx_queue_len = eib->ipmsglim;
+	fsm_event(privptr->fsm, DEV_EVENT_CONUP, netdev);
+}
+
+static void
+conn_action_conntimsev(fsm_instance *fi, int event, void *arg)
+{
+	struct iucv_connection *conn = (struct iucv_connection *)arg;
+	__u8 udata[16];
+
+	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
+
+	fsm_deltimer(&conn->timer);
+	iucv_sever(conn->pathid, udata);
+	fsm_newstate(fi, CONN_STATE_STARTWAIT);
+}
+
+static void
+conn_action_connsever(fsm_instance *fi, int event, void *arg)
+{
+	struct iucv_event *ev = (struct iucv_event *)arg;
+	struct iucv_connection *conn = ev->conn;
+	struct net_device *netdev = conn->netdev;
+	struct netiucv_priv *privptr = (struct netiucv_priv *)netdev->priv;
+	__u8 udata[16];
+
+	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
+
+	fsm_deltimer(&conn->timer);
+	iucv_sever(conn->pathid, udata);
+	PRINT_INFO("%s: Remote dropped connection\n", netdev->name);
+	IUCV_DBF_TEXT(data, 2,
+		"conn_action_connsever: Remote dropped connection\n");
+	fsm_newstate(fi, CONN_STATE_STARTWAIT);
+	fsm_event(privptr->fsm, DEV_EVENT_CONDOWN, netdev);
+}
+
+static void
+conn_action_start(fsm_instance *fi, int event, void *arg)
+{
+	struct iucv_event *ev = (struct iucv_event *)arg;
+	struct iucv_connection *conn = ev->conn;
+	__u16 msglimit;
+	int rc;
+
+	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
+
+	if (!conn->handle) {
+		IUCV_DBF_TEXT(trace, 5, "calling iucv_register_program\n");
+		conn->handle =
+			iucv_register_program(iucvMagic, conn->userid,
+					      netiucv_mask,
+					      &netiucv_ops, conn);
+		fsm_newstate(fi, CONN_STATE_STARTWAIT);
+		if (!conn->handle) {
+			fsm_newstate(fi, CONN_STATE_REGERR);
+			conn->handle = NULL;
+			IUCV_DBF_TEXT(setup, 2,
+				"NULL from iucv_register_program\n");
+			return;
+		}
+
+		PRINT_DEBUG("%s('%s'): registered successfully\n",
+			 conn->netdev->name, conn->userid);
+	}
+
+	PRINT_DEBUG("%s('%s'): connecting ...\n",
+		 conn->netdev->name, conn->userid);
+
+	/* We must set the state before calling iucv_connect because the callback
+	 * handler could be called at any point after the connection request is
+	 * sent */
+
+	fsm_newstate(fi, CONN_STATE_SETUPWAIT);
+	rc = iucv_connect(&(conn->pathid), NETIUCV_QUEUELEN_DEFAULT, iucvMagic,
+			  conn->userid, iucv_host, 0, NULL, &msglimit,
+			  conn->handle, conn);
+	switch (rc) {
+		case 0:
+			conn->netdev->tx_queue_len = msglimit;
+			fsm_addtimer(&conn->timer, NETIUCV_TIMEOUT_5SEC,
+				CONN_EVENT_TIMER, conn);
+			return;
+		case 11:
+			PRINT_INFO("%s: User %s is currently not available.\n",
+			       conn->netdev->name,
+			       netiucv_printname(conn->userid));
+			fsm_newstate(fi, CONN_STATE_STARTWAIT);
+			return;
+		case 12:
+			PRINT_INFO("%s: User %s is currently not ready.\n",
+			       conn->netdev->name,
+			       netiucv_printname(conn->userid));
+			fsm_newstate(fi, CONN_STATE_STARTWAIT);
+			return;
+		case 13:
+			PRINT_WARN("%s: Too many IUCV connections.\n",
+			       conn->netdev->name);
+			fsm_newstate(fi, CONN_STATE_CONNERR);
+			break;
+		case 14:
+			PRINT_WARN(
+			       "%s: User %s has too many IUCV connections.\n",
+			       conn->netdev->name,
+			       netiucv_printname(conn->userid));
+			fsm_newstate(fi, CONN_STATE_CONNERR);
+			break;
+		case 15:
+			PRINT_WARN(
+			       "%s: No IUCV authorization in CP directory.\n",
+			       conn->netdev->name);
+			fsm_newstate(fi, CONN_STATE_CONNERR);
+			break;
+		default:
+			PRINT_WARN("%s: iucv_connect returned error %d\n",
+			       conn->netdev->name, rc);
+			fsm_newstate(fi, CONN_STATE_CONNERR);
+			break;
+	}
+	IUCV_DBF_TEXT_(setup, 5, "iucv_connect rc is %d\n", rc);
+	IUCV_DBF_TEXT(trace, 5, "calling iucv_unregister_program\n");
+	iucv_unregister_program(conn->handle);
+	conn->handle = NULL;
+}
+
+static void
+netiucv_purge_skb_queue(struct sk_buff_head *q)
+{
+	struct sk_buff *skb;
+
+	while ((skb = skb_dequeue(q))) {
+		atomic_dec(&skb->users);
+		dev_kfree_skb_any(skb);
+	}
+}
+
+static void
+conn_action_stop(fsm_instance *fi, int event, void *arg)
+{
+	struct iucv_event *ev = (struct iucv_event *)arg;
+	struct iucv_connection *conn = ev->conn;
+	struct net_device *netdev = conn->netdev;
+	struct netiucv_priv *privptr = (struct netiucv_priv *)netdev->priv;
+
+	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
+
+	fsm_deltimer(&conn->timer);
+	fsm_newstate(fi, CONN_STATE_STOPPED);
+	netiucv_purge_skb_queue(&conn->collect_queue);
+	if (conn->handle)
+		IUCV_DBF_TEXT(trace, 5, "calling iucv_unregister_program\n");
+		iucv_unregister_program(conn->handle);
+	conn->handle = NULL;
+	netiucv_purge_skb_queue(&conn->commit_queue);
+	fsm_event(privptr->fsm, DEV_EVENT_CONDOWN, netdev);
+}
+
+static void
+conn_action_inval(fsm_instance *fi, int event, void *arg)
+{
+	struct iucv_event *ev = (struct iucv_event *)arg;
+	struct iucv_connection *conn = ev->conn;
+	struct net_device *netdev = conn->netdev;
+
+	PRINT_WARN("%s: Cannot connect without username\n",
+	       netdev->name);
+	IUCV_DBF_TEXT(data, 2, "conn_action_inval called\n");
+}
+
+static const fsm_node conn_fsm[] = {
+	{ CONN_STATE_INVALID,   CONN_EVENT_START,    conn_action_inval      },
+	{ CONN_STATE_STOPPED,   CONN_EVENT_START,    conn_action_start      },
+
+	{ CONN_STATE_STOPPED,   CONN_EVENT_STOP,     conn_action_stop       },
+	{ CONN_STATE_STARTWAIT, CONN_EVENT_STOP,     conn_action_stop       },
+	{ CONN_STATE_SETUPWAIT, CONN_EVENT_STOP,     conn_action_stop       },
+	{ CONN_STATE_IDLE,      CONN_EVENT_STOP,     conn_action_stop       },
+	{ CONN_STATE_TX,        CONN_EVENT_STOP,     conn_action_stop       },
+	{ CONN_STATE_REGERR,    CONN_EVENT_STOP,     conn_action_stop       },
+	{ CONN_STATE_CONNERR,   CONN_EVENT_STOP,     conn_action_stop       },
+
+	{ CONN_STATE_STOPPED,   CONN_EVENT_CONN_REQ, conn_action_connreject },
+        { CONN_STATE_STARTWAIT, CONN_EVENT_CONN_REQ, conn_action_connaccept },
+	{ CONN_STATE_SETUPWAIT, CONN_EVENT_CONN_REQ, conn_action_connaccept },
+	{ CONN_STATE_IDLE,      CONN_EVENT_CONN_REQ, conn_action_connreject },
+	{ CONN_STATE_TX,        CONN_EVENT_CONN_REQ, conn_action_connreject },
+
+	{ CONN_STATE_SETUPWAIT, CONN_EVENT_CONN_ACK, conn_action_connack    },
+	{ CONN_STATE_SETUPWAIT, CONN_EVENT_TIMER,    conn_action_conntimsev },
+
+	{ CONN_STATE_SETUPWAIT, CONN_EVENT_CONN_REJ, conn_action_connsever  },
+	{ CONN_STATE_IDLE,      CONN_EVENT_CONN_REJ, conn_action_connsever  },
+	{ CONN_STATE_TX,        CONN_EVENT_CONN_REJ, conn_action_connsever  },
+
+	{ CONN_STATE_IDLE,      CONN_EVENT_RX,       conn_action_rx         },
+	{ CONN_STATE_TX,        CONN_EVENT_RX,       conn_action_rx         },
+
+	{ CONN_STATE_TX,        CONN_EVENT_TXDONE,   conn_action_txdone     },
+	{ CONN_STATE_IDLE,      CONN_EVENT_TXDONE,   conn_action_txdone     },
+};
+
+static const int CONN_FSM_LEN = sizeof(conn_fsm) / sizeof(fsm_node);
+
+
+/**
+ * Actions for interface - statemachine.
+ *****************************************************************************/
+
+/**
+ * Startup connection by sending CONN_EVENT_START to it.
+ *
+ * @param fi    An instance of an interface statemachine.
+ * @param event The event, just happened.
+ * @param arg   Generic pointer, casted from struct net_device * upon call.
+ */
+static void
+dev_action_start(fsm_instance *fi, int event, void *arg)
+{
+	struct net_device   *dev = (struct net_device *)arg;
+	struct netiucv_priv *privptr = dev->priv;
+	struct iucv_event   ev;
+
+	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
+
+	ev.conn = privptr->conn;
+	fsm_newstate(fi, DEV_STATE_STARTWAIT);
+	fsm_event(privptr->conn->fsm, CONN_EVENT_START, &ev);
+}
+
+/**
+ * Shutdown connection by sending CONN_EVENT_STOP to it.
+ *
+ * @param fi    An instance of an interface statemachine.
+ * @param event The event, just happened.
+ * @param arg   Generic pointer, casted from struct net_device * upon call.
+ */
+static void
+dev_action_stop(fsm_instance *fi, int event, void *arg)
+{
+	struct net_device   *dev = (struct net_device *)arg;
+	struct netiucv_priv *privptr = dev->priv;
+	struct iucv_event   ev;
+
+	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
+
+	ev.conn = privptr->conn;
+
+	fsm_newstate(fi, DEV_STATE_STOPWAIT);
+	fsm_event(privptr->conn->fsm, CONN_EVENT_STOP, &ev);
+}
+
+/**
+ * Called from connection statemachine
+ * when a connection is up and running.
+ *
+ * @param fi    An instance of an interface statemachine.
+ * @param event The event, just happened.
+ * @param arg   Generic pointer, casted from struct net_device * upon call.
+ */
+static void
+dev_action_connup(fsm_instance *fi, int event, void *arg)
+{
+	struct net_device   *dev = (struct net_device *)arg;
+	struct netiucv_priv *privptr = dev->priv;
+
+	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
+
+	switch (fsm_getstate(fi)) {
+		case DEV_STATE_STARTWAIT:
+			fsm_newstate(fi, DEV_STATE_RUNNING);
+			PRINT_INFO("%s: connected with remote side %s\n",
+			       dev->name, privptr->conn->userid);
+			IUCV_DBF_TEXT(setup, 3,
+				"connection is up and running\n");
+			break;
+		case DEV_STATE_STOPWAIT:
+			PRINT_INFO(
+			       "%s: got connection UP event during shutdown!\n",
+			       dev->name);
+			IUCV_DBF_TEXT(data, 2,
+				"dev_action_connup: in DEV_STATE_STOPWAIT\n");
+			break;
+	}
+}
+
+/**
+ * Called from connection statemachine
+ * when a connection has been shutdown.
+ *
+ * @param fi    An instance of an interface statemachine.
+ * @param event The event, just happened.
+ * @param arg   Generic pointer, casted from struct net_device * upon call.
+ */
+static void
+dev_action_conndown(fsm_instance *fi, int event, void *arg)
+{
+	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
+
+	switch (fsm_getstate(fi)) {
+		case DEV_STATE_RUNNING:
+			fsm_newstate(fi, DEV_STATE_STARTWAIT);
+			break;
+		case DEV_STATE_STOPWAIT:
+			fsm_newstate(fi, DEV_STATE_STOPPED);
+			IUCV_DBF_TEXT(setup, 3, "connection is down\n");
+			break;
+	}
+}
+
+static const fsm_node dev_fsm[] = {
+	{ DEV_STATE_STOPPED,    DEV_EVENT_START,   dev_action_start    },
+
+	{ DEV_STATE_STOPWAIT,   DEV_EVENT_START,   dev_action_start    },
+	{ DEV_STATE_STOPWAIT,   DEV_EVENT_CONDOWN, dev_action_conndown },
+
+	{ DEV_STATE_STARTWAIT,  DEV_EVENT_STOP,    dev_action_stop     },
+	{ DEV_STATE_STARTWAIT,  DEV_EVENT_CONUP,   dev_action_connup   },
+
+	{ DEV_STATE_RUNNING,    DEV_EVENT_STOP,    dev_action_stop     },
+	{ DEV_STATE_RUNNING,    DEV_EVENT_CONDOWN, dev_action_conndown },
+	{ DEV_STATE_RUNNING,    DEV_EVENT_CONUP,   fsm_action_nop      },
+};
+
+static const int DEV_FSM_LEN = sizeof(dev_fsm) / sizeof(fsm_node);
+
+/**
+ * Transmit a packet.
+ * This is a helper function for netiucv_tx().
+ *
+ * @param conn Connection to be used for sending.
+ * @param skb Pointer to struct sk_buff of packet to send.
+ *            The linklevel header has already been set up
+ *            by netiucv_tx().
+ *
+ * @return 0 on success, -ERRNO on failure. (Never fails.)
+ */
+static int
+netiucv_transmit_skb(struct iucv_connection *conn, struct sk_buff *skb) {
+	unsigned long saveflags;
+	ll_header header;
+	int       rc = 0;
+
+	if (fsm_getstate(conn->fsm) != CONN_STATE_IDLE) {
+		int l = skb->len + NETIUCV_HDRLEN;
+
+		spin_lock_irqsave(&conn->collect_lock, saveflags);
+		if (conn->collect_len + l >
+		    (conn->max_buffsize - NETIUCV_HDRLEN)) {
+			rc = -EBUSY;
+			IUCV_DBF_TEXT(data, 2,
+				"EBUSY from netiucv_transmit_skb\n");
+		} else {
+			atomic_inc(&skb->users);
+			skb_queue_tail(&conn->collect_queue, skb);
+			conn->collect_len += l;
+		}
+		spin_unlock_irqrestore(&conn->collect_lock, saveflags);
+	} else {
+		struct sk_buff *nskb = skb;
+		/**
+		 * Copy the skb to a new allocated skb in lowmem only if the
+		 * data is located above 2G in memory or tailroom is < 2.
+		 */
+		unsigned long hi =
+			((unsigned long)(skb->tail + NETIUCV_HDRLEN)) >> 31;
+		int copied = 0;
+		if (hi || (skb_tailroom(skb) < 2)) {
+			nskb = alloc_skb(skb->len + NETIUCV_HDRLEN +
+					 NETIUCV_HDRLEN, GFP_ATOMIC | GFP_DMA);
+			if (!nskb) {
+				PRINT_WARN("%s: Could not allocate tx_skb\n",
+				       conn->netdev->name);
+				IUCV_DBF_TEXT(data, 2, "alloc_skb failed\n");
+				rc = -ENOMEM;
+				return rc;
+			} else {
+				skb_reserve(nskb, NETIUCV_HDRLEN);
+				memcpy(skb_put(nskb, skb->len),
+				       skb->data, skb->len);
+			}
+			copied = 1;
+		}
+		/**
+		 * skb now is below 2G and has enough room. Add headers.
+		 */
+		header.next = nskb->len + NETIUCV_HDRLEN;
+		memcpy(skb_push(nskb, NETIUCV_HDRLEN), &header, NETIUCV_HDRLEN);
+		header.next = 0;
+		memcpy(skb_put(nskb, NETIUCV_HDRLEN), &header,  NETIUCV_HDRLEN);
+
+		fsm_newstate(conn->fsm, CONN_STATE_TX);
+		conn->prof.send_stamp = xtime;
+		
+		rc = iucv_send(conn->pathid, NULL, 0, 0, 1 /* single_flag */,
+			0, nskb->data, nskb->len);
+			       /* Shut up, gcc! nskb is always below 2G. */
+		conn->prof.doios_single++;
+		conn->prof.txlen += skb->len;
+		conn->prof.tx_pending++;
+		if (conn->prof.tx_pending > conn->prof.tx_max_pending)
+			conn->prof.tx_max_pending = conn->prof.tx_pending;
+		if (rc) {
+			struct netiucv_priv *privptr;
+			fsm_newstate(conn->fsm, CONN_STATE_IDLE);
+			conn->prof.tx_pending--;
+			privptr = (struct netiucv_priv *)conn->netdev->priv;
+			if (privptr)
+				privptr->stats.tx_errors++;
+			if (copied)
+				dev_kfree_skb(nskb);
+			else {
+				/**
+				 * Remove our headers. They get added
+				 * again on retransmit.
+				 */
+				skb_pull(skb, NETIUCV_HDRLEN);
+				skb_trim(skb, skb->len - NETIUCV_HDRLEN);
+			}
+			PRINT_WARN("iucv_send returned %08x\n",	rc);
+			IUCV_DBF_TEXT_(data, 2, "rc %d from iucv_send\n", rc);
+		} else {
+			if (copied)
+				dev_kfree_skb(skb);
+			atomic_inc(&nskb->users);
+			skb_queue_tail(&conn->commit_queue, nskb);
+		}
+	}
+
+	return rc;
+}
+
+/**
+ * Interface API for upper network layers
+ *****************************************************************************/
+
+/**
+ * Open an interface.
+ * Called from generic network layer when ifconfig up is run.
+ *
+ * @param dev Pointer to interface struct.
+ *
+ * @return 0 on success, -ERRNO on failure. (Never fails.)
+ */
+static int
+netiucv_open(struct net_device *dev) {
+	fsm_event(((struct netiucv_priv *)dev->priv)->fsm, DEV_EVENT_START,dev);
+	return 0;
+}
+
+/**
+ * Close an interface.
+ * Called from generic network layer when ifconfig down is run.
+ *
+ * @param dev Pointer to interface struct.
+ *
+ * @return 0 on success, -ERRNO on failure. (Never fails.)
+ */
+static int
+netiucv_close(struct net_device *dev) {
+	fsm_event(((struct netiucv_priv *)dev->priv)->fsm, DEV_EVENT_STOP, dev);
+	return 0;
+}
+
+/**
+ * Start transmission of a packet.
+ * Called from generic network device layer.
+ *
+ * @param skb Pointer to buffer containing the packet.
+ * @param dev Pointer to interface struct.
+ *
+ * @return 0 if packet consumed, !0 if packet rejected.
+ *         Note: If we return !0, then the packet is free'd by
+ *               the generic network layer.
+ */
+static int netiucv_tx(struct sk_buff *skb, struct net_device *dev)
+{
+	int          rc = 0;
+	struct netiucv_priv *privptr = dev->priv;
+
+	IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
+	/**
+	 * Some sanity checks ...
+	 */
+	if (skb == NULL) {
+		PRINT_WARN("%s: NULL sk_buff passed\n", dev->name);
+		IUCV_DBF_TEXT(data, 2, "netiucv_tx: skb is NULL\n");
+		privptr->stats.tx_dropped++;
+		return 0;
+	}
+	if (skb_headroom(skb) < NETIUCV_HDRLEN) {
+		PRINT_WARN("%s: Got sk_buff with head room < %ld bytes\n",
+		       dev->name, NETIUCV_HDRLEN);
+		IUCV_DBF_TEXT(data, 2,
+			"netiucv_tx: skb_headroom < NETIUCV_HDRLEN\n");
+		dev_kfree_skb(skb);
+		privptr->stats.tx_dropped++;
+		return 0;
+	}
+
+	/**
+	 * If connection is not running, try to restart it
+	 * and throw away packet. 
+	 */
+	if (fsm_getstate(privptr->fsm) != DEV_STATE_RUNNING) {
+		fsm_event(privptr->fsm, DEV_EVENT_START, dev);
+		dev_kfree_skb(skb);
+		privptr->stats.tx_dropped++;
+		privptr->stats.tx_errors++;
+		privptr->stats.tx_carrier_errors++;
+		return 0;
+	}
+
+	if (netiucv_test_and_set_busy(dev)) {
+		IUCV_DBF_TEXT(data, 2, "EBUSY from netiucv_tx\n");
+		return -EBUSY;
+	}
+	dev->trans_start = jiffies;
+	if (netiucv_transmit_skb(privptr->conn, skb))
+		rc = 1;
+	netiucv_clear_busy(dev);
+	return rc;
+}
+
+/**
+ * Returns interface statistics of a device.
+ *
+ * @param dev Pointer to interface struct.
+ *
+ * @return Pointer to stats struct of this interface.
+ */
+static struct net_device_stats *
+netiucv_stats (struct net_device * dev)
+{
+	IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
+	return &((struct netiucv_priv *)dev->priv)->stats;
+}
+
+/**
+ * Sets MTU of an interface.
+ *
+ * @param dev     Pointer to interface struct.
+ * @param new_mtu The new MTU to use for this interface.
+ *
+ * @return 0 on success, -EINVAL if MTU is out of valid range.
+ *         (valid range is 576 .. NETIUCV_MTU_MAX).
+ */
+static int
+netiucv_change_mtu (struct net_device * dev, int new_mtu)
+{
+	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
+	if ((new_mtu < 576) || (new_mtu > NETIUCV_MTU_MAX)) {
+		IUCV_DBF_TEXT(setup, 2, "given MTU out of valid range\n");
+		return -EINVAL;
+	}
+	dev->mtu = new_mtu;
+	return 0;
+}
+
+/**
+ * attributes in sysfs
+ *****************************************************************************/
+
+static ssize_t
+user_show (struct device *dev, char *buf)
+{
+	struct netiucv_priv *priv = dev->driver_data;
+
+	IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
+	return sprintf(buf, "%s\n", netiucv_printname(priv->conn->userid));
+}
+
+static ssize_t
+user_write (struct device *dev, const char *buf, size_t count)
+{
+	struct netiucv_priv *priv = dev->driver_data;
+	struct net_device *ndev = priv->conn->netdev;
+	char    *p;
+	char    *tmp;
+	char 	username[10];
+	int 	i;
+
+	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
+	if (count>9) {
+		PRINT_WARN("netiucv: username too long (%d)!\n", (int)count);
+		IUCV_DBF_TEXT_(setup, 2,
+			"%d is length of username\n", (int)count);
+		return -EINVAL;
+	}
+
+	tmp = strsep((char **) &buf, "\n");
+	for (i=0, p=tmp; i<8 && *p; i++, p++) {
+		if (isalnum(*p) || (*p == '$'))
+			username[i]= *p;
+		else if (*p == '\n') {
+			/* trailing lf, grr */
+			break;
+		} else {
+			PRINT_WARN("netiucv: Invalid char %c in username!\n",
+				*p);
+			IUCV_DBF_TEXT_(setup, 2,
+				"username: invalid character %c\n",
+				*p);
+			return -EINVAL;
+		}
+	}
+	while (i<9)
+		username[i++] = ' ';
+	username[9] = '\0';
+
+	if (memcmp(username, priv->conn->userid, 8)) {
+		/* username changed */
+		if (ndev->flags & (IFF_UP | IFF_RUNNING)) {
+			PRINT_WARN(
+				"netiucv: device %s active, connected to %s\n",
+				dev->bus_id, priv->conn->userid);
+			PRINT_WARN("netiucv: user cannot be updated\n");
+			IUCV_DBF_TEXT(setup, 2, "user_write: device active\n");
+			return -EBUSY;
+		}
+	}
+	memcpy(priv->conn->userid, username, 9);
+
+	return count;
+
+}
+
+static DEVICE_ATTR(user, 0644, user_show, user_write);
+
+static ssize_t
+buffer_show (struct device *dev, char *buf)
+{
+	struct netiucv_priv *priv = dev->driver_data;
+
+	IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
+	return sprintf(buf, "%d\n", priv->conn->max_buffsize);
+}
+
+static ssize_t
+buffer_write (struct device *dev, const char *buf, size_t count)
+{
+	struct netiucv_priv *priv = dev->driver_data;
+	struct net_device *ndev = priv->conn->netdev;
+	char         *e;
+	int          bs1;
+
+	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
+	if (count >= 39)
+		return -EINVAL;
+
+	bs1 = simple_strtoul(buf, &e, 0);
+
+	if (e && (!isspace(*e))) {
+		PRINT_WARN("netiucv: Invalid character in buffer!\n");
+		IUCV_DBF_TEXT_(setup, 2, "buffer_write: invalid char %c\n", *e);
+		return -EINVAL;
+	}
+	if (bs1 > NETIUCV_BUFSIZE_MAX) {
+		PRINT_WARN("netiucv: Given buffer size %d too large.\n",
+			bs1);
+		IUCV_DBF_TEXT_(setup, 2,
+			"buffer_write: buffer size %d too large\n",
+			bs1);
+		return -EINVAL;
+	}
+	if ((ndev->flags & IFF_RUNNING) &&
+	    (bs1 < (ndev->mtu + NETIUCV_HDRLEN + 2))) {
+		PRINT_WARN("netiucv: Given buffer size %d too small.\n",
+			bs1);
+		IUCV_DBF_TEXT_(setup, 2,
+			"buffer_write: buffer size %d too small\n",
+			bs1);
+		return -EINVAL;
+	}
+	if (bs1 < (576 + NETIUCV_HDRLEN + NETIUCV_HDRLEN)) {
+		PRINT_WARN("netiucv: Given buffer size %d too small.\n",
+			bs1);
+		IUCV_DBF_TEXT_(setup, 2,
+			"buffer_write: buffer size %d too small\n",
+			bs1);
+		return -EINVAL;
+	}
+
+	priv->conn->max_buffsize = bs1;
+	if (!(ndev->flags & IFF_RUNNING))
+		ndev->mtu = bs1 - NETIUCV_HDRLEN - NETIUCV_HDRLEN;
+
+	return count;
+
+}
+
+static DEVICE_ATTR(buffer, 0644, buffer_show, buffer_write);
+
+static ssize_t
+dev_fsm_show (struct device *dev, char *buf)
+{
+	struct netiucv_priv *priv = dev->driver_data;
+
+	IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
+	return sprintf(buf, "%s\n", fsm_getstate_str(priv->fsm));
+}
+
+static DEVICE_ATTR(device_fsm_state, 0444, dev_fsm_show, NULL);
+
+static ssize_t
+conn_fsm_show (struct device *dev, char *buf)
+{
+	struct netiucv_priv *priv = dev->driver_data;
+
+	IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
+	return sprintf(buf, "%s\n", fsm_getstate_str(priv->conn->fsm));
+}
+
+static DEVICE_ATTR(connection_fsm_state, 0444, conn_fsm_show, NULL);
+
+static ssize_t
+maxmulti_show (struct device *dev, char *buf)
+{
+	struct netiucv_priv *priv = dev->driver_data;
+
+	IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
+	return sprintf(buf, "%ld\n", priv->conn->prof.maxmulti);
+}
+
+static ssize_t
+maxmulti_write (struct device *dev, const char *buf, size_t count)
+{
+	struct netiucv_priv *priv = dev->driver_data;
+
+	IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
+	priv->conn->prof.maxmulti = 0;
+	return count;
+}
+
+static DEVICE_ATTR(max_tx_buffer_used, 0644, maxmulti_show, maxmulti_write);
+
+static ssize_t
+maxcq_show (struct device *dev, char *buf)
+{
+	struct netiucv_priv *priv = dev->driver_data;
+
+	IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
+	return sprintf(buf, "%ld\n", priv->conn->prof.maxcqueue);
+}
+
+static ssize_t
+maxcq_write (struct device *dev, const char *buf, size_t count)
+{
+	struct netiucv_priv *priv = dev->driver_data;
+	
+	IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
+	priv->conn->prof.maxcqueue = 0;
+	return count;
+}
+
+static DEVICE_ATTR(max_chained_skbs, 0644, maxcq_show, maxcq_write);
+
+static ssize_t
+sdoio_show (struct device *dev, char *buf)
+{
+	struct netiucv_priv *priv = dev->driver_data;
+
+	IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
+	return sprintf(buf, "%ld\n", priv->conn->prof.doios_single);
+}
+
+static ssize_t
+sdoio_write (struct device *dev, const char *buf, size_t count)
+{
+	struct netiucv_priv *priv = dev->driver_data;
+	
+	IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
+	priv->conn->prof.doios_single = 0;
+	return count;
+}
+
+static DEVICE_ATTR(tx_single_write_ops, 0644, sdoio_show, sdoio_write);
+
+static ssize_t
+mdoio_show (struct device *dev, char *buf)
+{
+	struct netiucv_priv *priv = dev->driver_data;
+
+	IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
+	return sprintf(buf, "%ld\n", priv->conn->prof.doios_multi);
+}
+
+static ssize_t
+mdoio_write (struct device *dev, const char *buf, size_t count)
+{
+	struct netiucv_priv *priv = dev->driver_data;
+	
+	IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
+	priv->conn->prof.doios_multi = 0;
+	return count;
+}
+
+static DEVICE_ATTR(tx_multi_write_ops, 0644, mdoio_show, mdoio_write);
+
+static ssize_t
+txlen_show (struct device *dev, char *buf)
+{
+	struct netiucv_priv *priv = dev->driver_data;
+
+	IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
+	return sprintf(buf, "%ld\n", priv->conn->prof.txlen);
+}
+
+static ssize_t
+txlen_write (struct device *dev, const char *buf, size_t count)
+{
+	struct netiucv_priv *priv = dev->driver_data;
+	
+	IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
+	priv->conn->prof.txlen = 0;
+	return count;
+}
+
+static DEVICE_ATTR(netto_bytes, 0644, txlen_show, txlen_write);
+
+static ssize_t
+txtime_show (struct device *dev, char *buf)
+{
+	struct netiucv_priv *priv = dev->driver_data;
+
+	IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
+	return sprintf(buf, "%ld\n", priv->conn->prof.tx_time);
+}
+
+static ssize_t
+txtime_write (struct device *dev, const char *buf, size_t count)
+{
+	struct netiucv_priv *priv = dev->driver_data;
+	
+	IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
+	priv->conn->prof.tx_time = 0;
+	return count;
+}
+
+static DEVICE_ATTR(max_tx_io_time, 0644, txtime_show, txtime_write);
+
+static ssize_t
+txpend_show (struct device *dev, char *buf)
+{
+	struct netiucv_priv *priv = dev->driver_data;
+
+	IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
+	return sprintf(buf, "%ld\n", priv->conn->prof.tx_pending);
+}
+
+static ssize_t
+txpend_write (struct device *dev, const char *buf, size_t count)
+{
+	struct netiucv_priv *priv = dev->driver_data;
+
+	IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
+	priv->conn->prof.tx_pending = 0;
+	return count;
+}
+
+static DEVICE_ATTR(tx_pending, 0644, txpend_show, txpend_write);
+
+static ssize_t
+txmpnd_show (struct device *dev, char *buf)
+{
+	struct netiucv_priv *priv = dev->driver_data;
+
+	IUCV_DBF_TEXT(trace, 5, __FUNCTION__);
+	return sprintf(buf, "%ld\n", priv->conn->prof.tx_max_pending);
+}
+
+static ssize_t
+txmpnd_write (struct device *dev, const char *buf, size_t count)
+{
+	struct netiucv_priv *priv = dev->driver_data;
+
+	IUCV_DBF_TEXT(trace, 4, __FUNCTION__);
+	priv->conn->prof.tx_max_pending = 0;
+	return count;
+}
+
+static DEVICE_ATTR(tx_max_pending, 0644, txmpnd_show, txmpnd_write);
+
+static struct attribute *netiucv_attrs[] = {
+	&dev_attr_buffer.attr,
+	&dev_attr_user.attr,
+	NULL,
+};
+
+static struct attribute_group netiucv_attr_group = {
+	.attrs = netiucv_attrs,
+};
+
+static struct attribute *netiucv_stat_attrs[] = {
+	&dev_attr_device_fsm_state.attr,
+	&dev_attr_connection_fsm_state.attr,
+	&dev_attr_max_tx_buffer_used.attr,
+	&dev_attr_max_chained_skbs.attr,
+	&dev_attr_tx_single_write_ops.attr,
+	&dev_attr_tx_multi_write_ops.attr,
+	&dev_attr_netto_bytes.attr,
+	&dev_attr_max_tx_io_time.attr,
+	&dev_attr_tx_pending.attr,
+	&dev_attr_tx_max_pending.attr,
+	NULL,
+};
+
+static struct attribute_group netiucv_stat_attr_group = {
+	.name  = "stats",
+	.attrs = netiucv_stat_attrs,
+};
+
+static inline int
+netiucv_add_files(struct device *dev)
+{
+	int ret;
+
+	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
+	ret = sysfs_create_group(&dev->kobj, &netiucv_attr_group);
+	if (ret)
+		return ret;
+	ret = sysfs_create_group(&dev->kobj, &netiucv_stat_attr_group);
+	if (ret)
+		sysfs_remove_group(&dev->kobj, &netiucv_attr_group);
+	return ret;
+}
+
+static inline void
+netiucv_remove_files(struct device *dev)
+{
+	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
+	sysfs_remove_group(&dev->kobj, &netiucv_stat_attr_group);
+	sysfs_remove_group(&dev->kobj, &netiucv_attr_group);
+}
+
+static int
+netiucv_register_device(struct net_device *ndev)
+{
+	struct netiucv_priv *priv = ndev->priv;
+	struct device *dev = kmalloc(sizeof(struct device), GFP_KERNEL);
+	int ret;
+
+
+	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
+
+	if (dev) {
+		memset(dev, 0, sizeof(struct device));
+		snprintf(dev->bus_id, BUS_ID_SIZE, "net%s", ndev->name);
+		dev->bus = &iucv_bus;
+		dev->parent = iucv_root;
+		/*
+		 * The release function could be called after the
+		 * module has been unloaded. It's _only_ task is to
+		 * free the struct. Therefore, we specify kfree()
+		 * directly here. (Probably a little bit obfuscating
+		 * but legitime ...).
+		 */
+		dev->release = (void (*)(struct device *))kfree;
+		dev->driver = &netiucv_driver;
+	} else
+		return -ENOMEM;
+
+	ret = device_register(dev);
+
+	if (ret)
+		return ret;
+	ret = netiucv_add_files(dev);
+	if (ret)
+		goto out_unreg;
+	priv->dev = dev;
+	dev->driver_data = priv;
+	return 0;
+
+out_unreg:
+	device_unregister(dev);
+	return ret;
+}
+
+static void
+netiucv_unregister_device(struct device *dev)
+{
+	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
+	netiucv_remove_files(dev);
+	device_unregister(dev);
+}
+
+/**
+ * Allocate and initialize a new connection structure.
+ * Add it to the list of netiucv connections;
+ */
+static struct iucv_connection *
+netiucv_new_connection(struct net_device *dev, char *username)
+{
+	struct iucv_connection **clist = &iucv_connections;
+	struct iucv_connection *conn =
+		(struct iucv_connection *)
+		kmalloc(sizeof(struct iucv_connection), GFP_KERNEL);
+
+	if (conn) {
+		memset(conn, 0, sizeof(struct iucv_connection));
+		skb_queue_head_init(&conn->collect_queue);
+		skb_queue_head_init(&conn->commit_queue);
+		conn->max_buffsize = NETIUCV_BUFSIZE_DEFAULT;
+		conn->netdev = dev;
+
+		conn->rx_buff = alloc_skb(NETIUCV_BUFSIZE_DEFAULT,
+					  GFP_KERNEL | GFP_DMA);
+		if (!conn->rx_buff) {
+			kfree(conn);
+			return NULL;
+		}
+		conn->tx_buff = alloc_skb(NETIUCV_BUFSIZE_DEFAULT,
+					  GFP_KERNEL | GFP_DMA);
+		if (!conn->tx_buff) {
+			kfree_skb(conn->rx_buff);
+			kfree(conn);
+			return NULL;
+		}
+		conn->fsm = init_fsm("netiucvconn", conn_state_names,
+				     conn_event_names, NR_CONN_STATES,
+				     NR_CONN_EVENTS, conn_fsm, CONN_FSM_LEN,
+				     GFP_KERNEL);
+		if (!conn->fsm) {
+			kfree_skb(conn->tx_buff);
+			kfree_skb(conn->rx_buff);
+			kfree(conn);
+			return NULL;
+		}
+		fsm_settimer(conn->fsm, &conn->timer);
+		fsm_newstate(conn->fsm, CONN_STATE_INVALID);
+
+		if (username) {
+			memcpy(conn->userid, username, 9);
+			fsm_newstate(conn->fsm, CONN_STATE_STOPPED);
+		}
+
+		conn->next = *clist;
+		*clist = conn;
+	}
+	return conn;
+}
+
+/**
+ * Release a connection structure and remove it from the
+ * list of netiucv connections.
+ */
+static void
+netiucv_remove_connection(struct iucv_connection *conn)
+{
+	struct iucv_connection **clist = &iucv_connections;
+
+	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
+	if (conn == NULL)
+		return;
+	while (*clist) {
+		if (*clist == conn) {
+			*clist = conn->next;
+			if (conn->handle) {
+				iucv_unregister_program(conn->handle);
+				conn->handle = NULL;
+			}
+			fsm_deltimer(&conn->timer);
+			kfree_fsm(conn->fsm);
+			kfree_skb(conn->rx_buff);
+			kfree_skb(conn->tx_buff);
+			return;
+		}
+		clist = &((*clist)->next);
+	}
+}
+
+/**
+ * Release everything of a net device.
+ */
+static void
+netiucv_free_netdevice(struct net_device *dev)
+{
+	struct netiucv_priv *privptr;
+
+	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
+
+	if (!dev)
+		return;
+
+	privptr = (struct netiucv_priv *)dev->priv;
+	if (privptr) {
+		if (privptr->conn)
+			netiucv_remove_connection(privptr->conn);
+		if (privptr->fsm)
+			kfree_fsm(privptr->fsm);
+		privptr->conn = NULL; privptr->fsm = NULL;
+		/* privptr gets freed by free_netdev() */
+	}
+	free_netdev(dev);
+}
+
+/**
+ * Initialize a net device. (Called from kernel in alloc_netdev())
+ */
+static void
+netiucv_setup_netdevice(struct net_device *dev)
+{
+        memset(dev->priv, 0, sizeof(struct netiucv_priv));
+
+	dev->mtu	         = NETIUCV_MTU_DEFAULT;
+	dev->hard_start_xmit     = netiucv_tx;
+	dev->open	         = netiucv_open;
+	dev->stop	         = netiucv_close;
+	dev->get_stats	         = netiucv_stats;
+	dev->change_mtu          = netiucv_change_mtu;
+	dev->destructor          = netiucv_free_netdevice;
+	dev->hard_header_len     = NETIUCV_HDRLEN;
+	dev->addr_len            = 0;
+	dev->type                = ARPHRD_SLIP;
+	dev->tx_queue_len        = NETIUCV_QUEUELEN_DEFAULT;
+	dev->flags	         = IFF_POINTOPOINT | IFF_NOARP;
+	SET_MODULE_OWNER(dev);
+}
+
+/**
+ * Allocate and initialize everything of a net device.
+ */
+static struct net_device *
+netiucv_init_netdevice(char *username)
+{
+	struct netiucv_priv *privptr;
+	struct net_device *dev;
+
+	dev = alloc_netdev(sizeof(struct netiucv_priv), "iucv%d",
+			   netiucv_setup_netdevice);
+	if (!dev)
+		return NULL;
+	if (dev_alloc_name(dev, dev->name) < 0) {
+		free_netdev(dev);
+		return NULL;
+	}
+
+	privptr = (struct netiucv_priv *)dev->priv;
+	privptr->fsm = init_fsm("netiucvdev", dev_state_names,
+				dev_event_names, NR_DEV_STATES, NR_DEV_EVENTS,
+				dev_fsm, DEV_FSM_LEN, GFP_KERNEL);
+	if (!privptr->fsm) {
+		free_netdev(dev);
+		return NULL;
+	}
+	privptr->conn = netiucv_new_connection(dev, username);
+	if (!privptr->conn) {
+		kfree_fsm(privptr->fsm);
+		free_netdev(dev);
+		IUCV_DBF_TEXT(setup, 2, "NULL from netiucv_new_connection\n");
+		return NULL;
+	}
+	fsm_newstate(privptr->fsm, DEV_STATE_STOPPED);
+
+	return dev;
+}
+
+static ssize_t
+conn_write(struct device_driver *drv, const char *buf, size_t count)
+{
+	char *p;
+	char username[10];
+	int i, ret;
+	struct net_device *dev;
+
+	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
+	if (count>9) {
+		PRINT_WARN("netiucv: username too long (%d)!\n", (int)count);
+		IUCV_DBF_TEXT(setup, 2, "conn_write: too long\n");
+		return -EINVAL;
+	}
+
+	for (i=0, p=(char *)buf; i<8 && *p; i++, p++) {
+		if (isalnum(*p) || (*p == '$'))
+			username[i]= *p;
+		else if (*p == '\n') {
+			/* trailing lf, grr */
+			break;
+		} else {
+			PRINT_WARN("netiucv: Invalid character in username!\n");
+			IUCV_DBF_TEXT_(setup, 2,
+				"conn_write: invalid character %c\n", *p);
+			return -EINVAL;
+		}
+	}
+	while (i<9)
+		username[i++] = ' ';
+	username[9] = '\0';
+	dev = netiucv_init_netdevice(username);
+	if (!dev) {
+		PRINT_WARN(
+		       "netiucv: Could not allocate network device structure "
+		       "for user '%s'\n", netiucv_printname(username));
+		IUCV_DBF_TEXT(setup, 2, "NULL from netiucv_init_netdevice\n");
+		return -ENODEV;
+	}
+
+	if ((ret = netiucv_register_device(dev))) {
+		IUCV_DBF_TEXT_(setup, 2,
+			"ret %d from netiucv_register_device\n", ret);
+		goto out_free_ndev;
+	}
+
+	/* sysfs magic */
+	SET_NETDEV_DEV(dev,
+			(struct device*)((struct netiucv_priv*)dev->priv)->dev);
+
+	if ((ret = register_netdev(dev))) {
+		netiucv_unregister_device((struct device*)
+			((struct netiucv_priv*)dev->priv)->dev);
+		goto out_free_ndev;
+	}
+
+	PRINT_INFO("%s: '%s'\n", dev->name, netiucv_printname(username));
+	
+	return count;
+
+out_free_ndev:
+	PRINT_WARN("netiucv: Could not register '%s'\n", dev->name);
+	IUCV_DBF_TEXT(setup, 2, "conn_write: could not register\n");
+	netiucv_free_netdevice(dev);
+	return ret;
+}
+
+DRIVER_ATTR(connection, 0200, NULL, conn_write);
+
+static ssize_t
+remove_write (struct device_driver *drv, const char *buf, size_t count)
+{
+	struct iucv_connection **clist = &iucv_connections;
+        struct net_device *ndev;
+        struct netiucv_priv *priv;
+        struct device *dev;
+        char name[IFNAMSIZ];
+        char *p;
+        int i;
+
+        IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
+
+        if (count >= IFNAMSIZ)
+                count = IFNAMSIZ-1;
+
+        for (i=0, p=(char *)buf; i<count && *p; i++, p++) {
+                if ((*p == '\n') | (*p == ' ')) {
+                        /* trailing lf, grr */
+                        break;
+                } else {
+                        name[i]=*p;
+                }
+        }
+        name[i] = '\0';
+
+        while (*clist) {
+                ndev = (*clist)->netdev;
+                priv = (struct netiucv_priv*)ndev->priv;
+                dev = priv->dev;
+
+                if (strncmp(name, ndev->name, count)) {
+                        clist = &((*clist)->next);
+                        continue;
+                }
+                if (ndev->flags & (IFF_UP | IFF_RUNNING)) {
+                        PRINT_WARN(
+                                "netiucv: net device %s active with peer %s\n",
+                                ndev->name, priv->conn->userid);
+                        PRINT_WARN("netiucv: %s cannot be removed\n",
+                                ndev->name);
+			IUCV_DBF_TEXT(data, 2, "remove_write: still active\n");
+                        return -EBUSY;
+                }
+                unregister_netdev(ndev);
+                netiucv_unregister_device(dev);
+                return count;
+        }
+        PRINT_WARN("netiucv: net device %s unknown\n", name);
+	IUCV_DBF_TEXT(data, 2, "remove_write: unknown device\n");
+        return -EINVAL;
+}
+
+DRIVER_ATTR(remove, 0200, NULL, remove_write);
+
+static void
+netiucv_banner(void)
+{
+	char vbuf[] = "$Revision: 1.63 $";
+	char *version = vbuf;
+
+	if ((version = strchr(version, ':'))) {
+		char *p = strchr(version + 1, '$');
+		if (p)
+			*p = '\0';
+	} else
+		version = " ??? ";
+	PRINT_INFO("NETIUCV driver Version%s initialized\n", version);
+}
+
+static void __exit
+netiucv_exit(void)
+{
+	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
+	while (iucv_connections) {
+		struct net_device *ndev = iucv_connections->netdev;
+		struct netiucv_priv *priv = (struct netiucv_priv*)ndev->priv;
+		struct device *dev = priv->dev;
+
+		unregister_netdev(ndev);
+		netiucv_unregister_device(dev);
+	}
+
+	driver_remove_file(&netiucv_driver, &driver_attr_connection);
+	driver_remove_file(&netiucv_driver, &driver_attr_remove);
+	driver_unregister(&netiucv_driver);
+	iucv_unregister_dbf_views();
+
+	PRINT_INFO("NETIUCV driver unloaded\n");
+	return;
+}
+
+static int __init
+netiucv_init(void)
+{
+	int ret;
+	
+	ret = iucv_register_dbf_views();
+	if (ret) {
+		PRINT_WARN("netiucv_init failed, "
+			"iucv_register_dbf_views rc = %d\n", ret);
+		return ret;
+	}
+	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);
+	ret = driver_register(&netiucv_driver);
+	if (ret) {
+		PRINT_ERR("NETIUCV: failed to register driver.\n");
+		IUCV_DBF_TEXT_(setup, 2, "ret %d from driver_register\n", ret);
+		iucv_unregister_dbf_views();
+		return ret;
+	}
+
+	/* Add entry for specifying connections. */
+	ret = driver_create_file(&netiucv_driver, &driver_attr_connection);
+	if (!ret) {
+		ret = driver_create_file(&netiucv_driver, &driver_attr_remove);
+		netiucv_banner();
+	} else {
+		PRINT_ERR("NETIUCV: failed to add driver attribute.\n");
+		IUCV_DBF_TEXT_(setup, 2, "ret %d from driver_create_file\n", ret);
+		driver_unregister(&netiucv_driver);
+		iucv_unregister_dbf_views();
+	}
+	return ret;
+}
+	
+module_init(netiucv_init);
+module_exit(netiucv_exit);
+MODULE_LICENSE("GPL");