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, 1422 insertions, 0 deletions

diff --git a/drivers/net/iseries_veth.c b/drivers/net/iseries_veth.c
new file mode 100644
index 0000000..855f8b2
--- /dev/null
+++ b/drivers/net/iseries_veth.c
@@ -0,0 +1,1422 @@
+/* File veth.c created by Kyle A. Lucke on Mon Aug  7 2000. */
+/*
+ * IBM eServer iSeries Virtual Ethernet Device Driver
+ * Copyright (C) 2001 Kyle A. Lucke (klucke@us.ibm.com), IBM Corp.
+ * Substantially cleaned up by:
+ * Copyright (C) 2003 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
+ *
+ * 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.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ * USA
+ *
+ *
+ * This module implements the virtual ethernet device for iSeries LPAR
+ * Linux.  It uses hypervisor message passing to implement an
+ * ethernet-like network device communicating between partitions on
+ * the iSeries.
+ *
+ * The iSeries LPAR hypervisor currently allows for up to 16 different
+ * virtual ethernets.  These are all dynamically configurable on
+ * OS/400 partitions, but dynamic configuration is not supported under
+ * Linux yet.  An ethXX network device will be created for each
+ * virtual ethernet this partition is connected to.
+ *
+ * - This driver is responsible for routing packets to and from other
+ *   partitions.  The MAC addresses used by the virtual ethernets
+ *   contains meaning and must not be modified.
+ *
+ * - Having 2 virtual ethernets to the same remote partition DOES NOT
+ *   double the available bandwidth.  The 2 devices will share the
+ *   available hypervisor bandwidth.
+ *
+ * - If you send a packet to your own mac address, it will just be
+ *   dropped, you won't get it on the receive side.
+ *
+ * - Multicast is implemented by sending the frame frame to every
+ *   other partition.  It is the responsibility of the receiving
+ *   partition to filter the addresses desired.
+ *
+ * Tunable parameters:
+ *
+ * VETH_NUMBUFFERS: This compile time option defaults to 120.  It
+ * controls how much memory Linux will allocate per remote partition
+ * it is communicating with.  It can be thought of as the maximum
+ * number of packets outstanding to a remote partition at a time.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/mm.h>
+#include <linux/ethtool.h>
+#include <asm/iSeries/mf.h>
+#include <asm/iSeries/iSeries_pci.h>
+#include <asm/uaccess.h>
+
+#include <asm/iSeries/HvLpConfig.h>
+#include <asm/iSeries/HvTypes.h>
+#include <asm/iSeries/HvLpEvent.h>
+#include <asm/iommu.h>
+#include <asm/vio.h>
+
+#include "iseries_veth.h"
+
+MODULE_AUTHOR("Kyle Lucke <klucke@us.ibm.com>");
+MODULE_DESCRIPTION("iSeries Virtual ethernet driver");
+MODULE_LICENSE("GPL");
+
+#define VETH_NUMBUFFERS		(120)
+#define VETH_ACKTIMEOUT 	(1000000) /* microseconds */
+#define VETH_MAX_MCAST		(12)
+
+#define VETH_MAX_MTU		(9000)
+
+#if VETH_NUMBUFFERS < 10
+#define ACK_THRESHOLD 		(1)
+#elif VETH_NUMBUFFERS < 20
+#define ACK_THRESHOLD 		(4)
+#elif VETH_NUMBUFFERS < 40
+#define ACK_THRESHOLD 		(10)
+#else
+#define ACK_THRESHOLD 		(20)
+#endif
+
+#define	VETH_STATE_SHUTDOWN	(0x0001)
+#define VETH_STATE_OPEN		(0x0002)
+#define VETH_STATE_RESET	(0x0004)
+#define VETH_STATE_SENTMON	(0x0008)
+#define VETH_STATE_SENTCAPS	(0x0010)
+#define VETH_STATE_GOTCAPACK	(0x0020)
+#define VETH_STATE_GOTCAPS	(0x0040)
+#define VETH_STATE_SENTCAPACK	(0x0080)
+#define VETH_STATE_READY	(0x0100)
+
+struct veth_msg {
+	struct veth_msg *next;
+	struct VethFramesData data;
+	int token;
+	unsigned long in_use;
+	struct sk_buff *skb;
+	struct device *dev;
+};
+
+struct veth_lpar_connection {
+	HvLpIndex remote_lp;
+	struct work_struct statemachine_wq;
+	struct veth_msg *msgs;
+	int num_events;
+	struct VethCapData local_caps;
+
+	struct timer_list ack_timer;
+
+	spinlock_t lock;
+	unsigned long state;
+	HvLpInstanceId src_inst;
+	HvLpInstanceId dst_inst;
+	struct VethLpEvent cap_event, cap_ack_event;
+	u16 pending_acks[VETH_MAX_ACKS_PER_MSG];
+	u32 num_pending_acks;
+
+	int num_ack_events;
+	struct VethCapData remote_caps;
+	u32 ack_timeout;
+
+	spinlock_t msg_stack_lock;
+	struct veth_msg *msg_stack_head;
+};
+
+struct veth_port {
+	struct device *dev;
+	struct net_device_stats stats;
+	u64 mac_addr;
+	HvLpIndexMap lpar_map;
+
+	spinlock_t pending_gate;
+	struct sk_buff *pending_skb;
+	HvLpIndexMap pending_lpmask;
+
+	rwlock_t mcast_gate;
+	int promiscuous;
+	int all_mcast;
+	int num_mcast;
+	u64 mcast_addr[VETH_MAX_MCAST];
+};
+
+static HvLpIndex this_lp;
+static struct veth_lpar_connection *veth_cnx[HVMAXARCHITECTEDLPS]; /* = 0 */
+static struct net_device *veth_dev[HVMAXARCHITECTEDVIRTUALLANS]; /* = 0 */
+
+static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev);
+static void veth_recycle_msg(struct veth_lpar_connection *, struct veth_msg *);
+static void veth_flush_pending(struct veth_lpar_connection *cnx);
+static void veth_receive(struct veth_lpar_connection *, struct VethLpEvent *);
+static void veth_timed_ack(unsigned long connectionPtr);
+
+/*
+ * Utility functions
+ */
+
+#define veth_printk(prio, fmt, args...) \
+	printk(prio "%s: " fmt, __FILE__, ## args)
+
+#define veth_error(fmt, args...) \
+	printk(KERN_ERR "(%s:%3.3d) ERROR: " fmt, __FILE__, __LINE__ , ## args)
+
+static inline void veth_stack_push(struct veth_lpar_connection *cnx,
+				   struct veth_msg *msg)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&cnx->msg_stack_lock, flags);
+	msg->next = cnx->msg_stack_head;
+	cnx->msg_stack_head = msg;
+	spin_unlock_irqrestore(&cnx->msg_stack_lock, flags);
+}
+
+static inline struct veth_msg *veth_stack_pop(struct veth_lpar_connection *cnx)
+{
+	unsigned long flags;
+	struct veth_msg *msg;
+
+	spin_lock_irqsave(&cnx->msg_stack_lock, flags);
+	msg = cnx->msg_stack_head;
+	if (msg)
+		cnx->msg_stack_head = cnx->msg_stack_head->next;
+	spin_unlock_irqrestore(&cnx->msg_stack_lock, flags);
+	return msg;
+}
+
+static inline HvLpEvent_Rc
+veth_signalevent(struct veth_lpar_connection *cnx, u16 subtype,
+		 HvLpEvent_AckInd ackind, HvLpEvent_AckType acktype,
+		 u64 token,
+		 u64 data1, u64 data2, u64 data3, u64 data4, u64 data5)
+{
+	return HvCallEvent_signalLpEventFast(cnx->remote_lp,
+					     HvLpEvent_Type_VirtualLan,
+					     subtype, ackind, acktype,
+					     cnx->src_inst,
+					     cnx->dst_inst,
+					     token, data1, data2, data3,
+					     data4, data5);
+}
+
+static inline HvLpEvent_Rc veth_signaldata(struct veth_lpar_connection *cnx,
+					   u16 subtype, u64 token, void *data)
+{
+	u64 *p = (u64 *) data;
+
+	return veth_signalevent(cnx, subtype, HvLpEvent_AckInd_NoAck,
+				HvLpEvent_AckType_ImmediateAck,
+				token, p[0], p[1], p[2], p[3], p[4]);
+}
+
+struct veth_allocation {
+	struct completion c;
+	int num;
+};
+
+static void veth_complete_allocation(void *parm, int number)
+{
+	struct veth_allocation *vc = (struct veth_allocation *)parm;
+
+	vc->num = number;
+	complete(&vc->c);
+}
+
+static int veth_allocate_events(HvLpIndex rlp, int number)
+{
+	struct veth_allocation vc = { COMPLETION_INITIALIZER(vc.c), 0 };
+
+	mf_allocate_lp_events(rlp, HvLpEvent_Type_VirtualLan,
+			    sizeof(struct VethLpEvent), number,
+			    &veth_complete_allocation, &vc);
+	wait_for_completion(&vc.c);
+
+	return vc.num;
+}
+
+/*
+ * LPAR connection code
+ */
+
+static inline void veth_kick_statemachine(struct veth_lpar_connection *cnx)
+{
+	schedule_work(&cnx->statemachine_wq);
+}
+
+static void veth_take_cap(struct veth_lpar_connection *cnx,
+			  struct VethLpEvent *event)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&cnx->lock, flags);
+	/* Receiving caps may mean the other end has just come up, so
+	 * we need to reload the instance ID of the far end */
+	cnx->dst_inst =
+		HvCallEvent_getTargetLpInstanceId(cnx->remote_lp,
+						  HvLpEvent_Type_VirtualLan);
+
+	if (cnx->state & VETH_STATE_GOTCAPS) {
+		veth_error("Received a second capabilities from lpar %d\n",
+			   cnx->remote_lp);
+		event->base_event.xRc = HvLpEvent_Rc_BufferNotAvailable;
+		HvCallEvent_ackLpEvent((struct HvLpEvent *) event);
+	} else {
+		memcpy(&cnx->cap_event, event, sizeof(cnx->cap_event));
+		cnx->state |= VETH_STATE_GOTCAPS;
+		veth_kick_statemachine(cnx);
+	}
+	spin_unlock_irqrestore(&cnx->lock, flags);
+}
+
+static void veth_take_cap_ack(struct veth_lpar_connection *cnx,
+			      struct VethLpEvent *event)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&cnx->lock, flags);
+	if (cnx->state & VETH_STATE_GOTCAPACK) {
+		veth_error("Received a second capabilities ack from lpar %d\n",
+			   cnx->remote_lp);
+	} else {
+		memcpy(&cnx->cap_ack_event, event,
+		       sizeof(&cnx->cap_ack_event));
+		cnx->state |= VETH_STATE_GOTCAPACK;
+		veth_kick_statemachine(cnx);
+	}
+	spin_unlock_irqrestore(&cnx->lock, flags);
+}
+
+static void veth_take_monitor_ack(struct veth_lpar_connection *cnx,
+				  struct VethLpEvent *event)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&cnx->lock, flags);
+	veth_printk(KERN_DEBUG, "Monitor ack returned for lpar %d\n",
+		    cnx->remote_lp);
+	cnx->state |= VETH_STATE_RESET;
+	veth_kick_statemachine(cnx);
+	spin_unlock_irqrestore(&cnx->lock, flags);
+}
+
+static void veth_handle_ack(struct VethLpEvent *event)
+{
+	HvLpIndex rlp = event->base_event.xTargetLp;
+	struct veth_lpar_connection *cnx = veth_cnx[rlp];
+
+	BUG_ON(! cnx);
+
+	switch (event->base_event.xSubtype) {
+	case VethEventTypeCap:
+		veth_take_cap_ack(cnx, event);
+		break;
+	case VethEventTypeMonitor:
+		veth_take_monitor_ack(cnx, event);
+		break;
+	default:
+		veth_error("Unknown ack type %d from lpar %d\n",
+			   event->base_event.xSubtype, rlp);
+	};
+}
+
+static void veth_handle_int(struct VethLpEvent *event)
+{
+	HvLpIndex rlp = event->base_event.xSourceLp;
+	struct veth_lpar_connection *cnx = veth_cnx[rlp];
+	unsigned long flags;
+	int i;
+
+	BUG_ON(! cnx);
+
+	switch (event->base_event.xSubtype) {
+	case VethEventTypeCap:
+		veth_take_cap(cnx, event);
+		break;
+	case VethEventTypeMonitor:
+		/* do nothing... this'll hang out here til we're dead,
+		 * and the hypervisor will return it for us. */
+		break;
+	case VethEventTypeFramesAck:
+		spin_lock_irqsave(&cnx->lock, flags);
+		for (i = 0; i < VETH_MAX_ACKS_PER_MSG; ++i) {
+			u16 msgnum = event->u.frames_ack_data.token[i];
+
+			if (msgnum < VETH_NUMBUFFERS)
+				veth_recycle_msg(cnx, cnx->msgs + msgnum);
+		}
+		spin_unlock_irqrestore(&cnx->lock, flags);
+		veth_flush_pending(cnx);
+		break;
+	case VethEventTypeFrames:
+		veth_receive(cnx, event);
+		break;
+	default:
+		veth_error("Unknown interrupt type %d from lpar %d\n",
+			   event->base_event.xSubtype, rlp);
+	};
+}
+
+static void veth_handle_event(struct HvLpEvent *event, struct pt_regs *regs)
+{
+	struct VethLpEvent *veth_event = (struct VethLpEvent *)event;
+
+	if (event->xFlags.xFunction == HvLpEvent_Function_Ack)
+		veth_handle_ack(veth_event);
+	else if (event->xFlags.xFunction == HvLpEvent_Function_Int)
+		veth_handle_int(veth_event);
+}
+
+static int veth_process_caps(struct veth_lpar_connection *cnx)
+{
+	struct VethCapData *remote_caps = &cnx->remote_caps;
+	int num_acks_needed;
+
+	/* Convert timer to jiffies */
+	cnx->ack_timeout = remote_caps->ack_timeout * HZ / 1000000;
+
+	if ( (remote_caps->num_buffers == 0)
+	     || (remote_caps->ack_threshold > VETH_MAX_ACKS_PER_MSG)
+	     || (remote_caps->ack_threshold == 0)
+	     || (cnx->ack_timeout == 0) ) {
+		veth_error("Received incompatible capabilities from lpar %d\n",
+			   cnx->remote_lp);
+		return HvLpEvent_Rc_InvalidSubtypeData;
+	}
+
+	num_acks_needed = (remote_caps->num_buffers
+			   / remote_caps->ack_threshold) + 1;
+
+	/* FIXME: locking on num_ack_events? */
+	if (cnx->num_ack_events < num_acks_needed) {
+		int num;
+
+		num = veth_allocate_events(cnx->remote_lp,
+					   num_acks_needed-cnx->num_ack_events);
+		if (num > 0)
+			cnx->num_ack_events += num;
+
+		if (cnx->num_ack_events < num_acks_needed) {
+			veth_error("Couldn't allocate enough ack events for lpar %d\n",
+				   cnx->remote_lp);
+
+			return HvLpEvent_Rc_BufferNotAvailable;
+		}
+	}
+
+
+	return HvLpEvent_Rc_Good;
+}
+
+/* FIXME: The gotos here are a bit dubious */
+static void veth_statemachine(void *p)
+{
+	struct veth_lpar_connection *cnx = (struct veth_lpar_connection *)p;
+	int rlp = cnx->remote_lp;
+	int rc;
+
+	spin_lock_irq(&cnx->lock);
+
+ restart:
+	if (cnx->state & VETH_STATE_RESET) {
+		int i;
+
+		del_timer(&cnx->ack_timer);
+
+		if (cnx->state & VETH_STATE_OPEN)
+			HvCallEvent_closeLpEventPath(cnx->remote_lp,
+						     HvLpEvent_Type_VirtualLan);
+
+		/* reset ack data */
+		memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
+		cnx->num_pending_acks = 0;
+
+		cnx->state &= ~(VETH_STATE_RESET | VETH_STATE_SENTMON
+				| VETH_STATE_OPEN | VETH_STATE_SENTCAPS
+				| VETH_STATE_GOTCAPACK | VETH_STATE_GOTCAPS
+				| VETH_STATE_SENTCAPACK | VETH_STATE_READY);
+
+		/* Clean up any leftover messages */
+		if (cnx->msgs)
+			for (i = 0; i < VETH_NUMBUFFERS; ++i)
+				veth_recycle_msg(cnx, cnx->msgs + i);
+		spin_unlock_irq(&cnx->lock);
+		veth_flush_pending(cnx);
+		spin_lock_irq(&cnx->lock);
+		if (cnx->state & VETH_STATE_RESET)
+			goto restart;
+	}
+
+	if (cnx->state & VETH_STATE_SHUTDOWN)
+		/* It's all over, do nothing */
+		goto out;
+
+	if ( !(cnx->state & VETH_STATE_OPEN) ) {
+		if (! cnx->msgs || (cnx->num_events < (2 + VETH_NUMBUFFERS)) )
+			goto cant_cope;
+
+		HvCallEvent_openLpEventPath(rlp, HvLpEvent_Type_VirtualLan);
+		cnx->src_inst =
+			HvCallEvent_getSourceLpInstanceId(rlp,
+							  HvLpEvent_Type_VirtualLan);
+		cnx->dst_inst =
+			HvCallEvent_getTargetLpInstanceId(rlp,
+							  HvLpEvent_Type_VirtualLan);
+		cnx->state |= VETH_STATE_OPEN;
+	}
+
+	if ( (cnx->state & VETH_STATE_OPEN)
+	     && !(cnx->state & VETH_STATE_SENTMON) ) {
+		rc = veth_signalevent(cnx, VethEventTypeMonitor,
+				      HvLpEvent_AckInd_DoAck,
+				      HvLpEvent_AckType_DeferredAck,
+				      0, 0, 0, 0, 0, 0);
+
+		if (rc == HvLpEvent_Rc_Good) {
+			cnx->state |= VETH_STATE_SENTMON;
+		} else {
+			if ( (rc != HvLpEvent_Rc_PartitionDead)
+			     && (rc != HvLpEvent_Rc_PathClosed) )
+				veth_error("Error sending monitor to "
+					   "lpar %d, rc=%x\n",
+					   rlp, (int) rc);
+
+			/* Oh well, hope we get a cap from the other
+			 * end and do better when that kicks us */
+			goto out;
+		}
+	}
+
+	if ( (cnx->state & VETH_STATE_OPEN)
+	     && !(cnx->state & VETH_STATE_SENTCAPS)) {
+		u64 *rawcap = (u64 *)&cnx->local_caps;
+
+		rc = veth_signalevent(cnx, VethEventTypeCap,
+				      HvLpEvent_AckInd_DoAck,
+				      HvLpEvent_AckType_ImmediateAck,
+				      0, rawcap[0], rawcap[1], rawcap[2],
+				      rawcap[3], rawcap[4]);
+
+		if (rc == HvLpEvent_Rc_Good) {
+			cnx->state |= VETH_STATE_SENTCAPS;
+		} else {
+			if ( (rc != HvLpEvent_Rc_PartitionDead)
+			     && (rc != HvLpEvent_Rc_PathClosed) )
+				veth_error("Error sending caps to "
+					   "lpar %d, rc=%x\n",
+					   rlp, (int) rc);
+			/* Oh well, hope we get a cap from the other
+			 * end and do better when that kicks us */
+			goto out;
+		}
+	}
+
+	if ((cnx->state & VETH_STATE_GOTCAPS)
+	    && !(cnx->state & VETH_STATE_SENTCAPACK)) {
+		struct VethCapData *remote_caps = &cnx->remote_caps;
+
+		memcpy(remote_caps, &cnx->cap_event.u.caps_data,
+		       sizeof(*remote_caps));
+
+		spin_unlock_irq(&cnx->lock);
+		rc = veth_process_caps(cnx);
+		spin_lock_irq(&cnx->lock);
+
+		/* We dropped the lock, so recheck for anything which
+		 * might mess us up */
+		if (cnx->state & (VETH_STATE_RESET|VETH_STATE_SHUTDOWN))
+			goto restart;
+
+		cnx->cap_event.base_event.xRc = rc;
+		HvCallEvent_ackLpEvent((struct HvLpEvent *)&cnx->cap_event);
+		if (rc == HvLpEvent_Rc_Good)
+			cnx->state |= VETH_STATE_SENTCAPACK;
+		else
+			goto cant_cope;
+	}
+
+	if ((cnx->state & VETH_STATE_GOTCAPACK)
+	    && (cnx->state & VETH_STATE_GOTCAPS)
+	    && !(cnx->state & VETH_STATE_READY)) {
+		if (cnx->cap_ack_event.base_event.xRc == HvLpEvent_Rc_Good) {
+			/* Start the ACK timer */
+			cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
+			add_timer(&cnx->ack_timer);
+			cnx->state |= VETH_STATE_READY;
+		} else {
+			veth_printk(KERN_ERR, "Caps rejected (rc=%d) by "
+				    "lpar %d\n",
+				    cnx->cap_ack_event.base_event.xRc,
+				    rlp);
+			goto cant_cope;
+		}
+	}
+
+ out:
+	spin_unlock_irq(&cnx->lock);
+	return;
+
+ cant_cope:
+	/* FIXME: we get here if something happens we really can't
+	 * cope with.  The link will never work once we get here, and
+	 * all we can do is not lock the rest of the system up */
+	veth_error("Badness on connection to lpar %d (state=%04lx) "
+		   " - shutting down\n", rlp, cnx->state);
+	cnx->state |= VETH_STATE_SHUTDOWN;
+	spin_unlock_irq(&cnx->lock);
+}
+
+static int veth_init_connection(u8 rlp)
+{
+	struct veth_lpar_connection *cnx;
+	struct veth_msg *msgs;
+	int i;
+
+	if ( (rlp == this_lp)
+	     || ! HvLpConfig_doLpsCommunicateOnVirtualLan(this_lp, rlp) )
+		return 0;
+
+	cnx = kmalloc(sizeof(*cnx), GFP_KERNEL);
+	if (! cnx)
+		return -ENOMEM;
+	memset(cnx, 0, sizeof(*cnx));
+
+	cnx->remote_lp = rlp;
+	spin_lock_init(&cnx->lock);
+	INIT_WORK(&cnx->statemachine_wq, veth_statemachine, cnx);
+	init_timer(&cnx->ack_timer);
+	cnx->ack_timer.function = veth_timed_ack;
+	cnx->ack_timer.data = (unsigned long) cnx;
+	memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
+
+	veth_cnx[rlp] = cnx;
+
+	msgs = kmalloc(VETH_NUMBUFFERS * sizeof(struct veth_msg), GFP_KERNEL);
+	if (! msgs) {
+		veth_error("Can't allocate buffers for lpar %d\n", rlp);
+		return -ENOMEM;
+	}
+
+	cnx->msgs = msgs;
+	memset(msgs, 0, VETH_NUMBUFFERS * sizeof(struct veth_msg));
+	spin_lock_init(&cnx->msg_stack_lock);
+
+	for (i = 0; i < VETH_NUMBUFFERS; i++) {
+		msgs[i].token = i;
+		veth_stack_push(cnx, msgs + i);
+	}
+
+	cnx->num_events = veth_allocate_events(rlp, 2 + VETH_NUMBUFFERS);
+
+	if (cnx->num_events < (2 + VETH_NUMBUFFERS)) {
+		veth_error("Can't allocate events for lpar %d, only got %d\n",
+			   rlp, cnx->num_events);
+		return -ENOMEM;
+	}
+
+	cnx->local_caps.num_buffers = VETH_NUMBUFFERS;
+	cnx->local_caps.ack_threshold = ACK_THRESHOLD;
+	cnx->local_caps.ack_timeout = VETH_ACKTIMEOUT;
+
+	return 0;
+}
+
+static void veth_stop_connection(u8 rlp)
+{
+	struct veth_lpar_connection *cnx = veth_cnx[rlp];
+
+	if (! cnx)
+		return;
+
+	spin_lock_irq(&cnx->lock);
+	cnx->state |= VETH_STATE_RESET | VETH_STATE_SHUTDOWN;
+	veth_kick_statemachine(cnx);
+	spin_unlock_irq(&cnx->lock);
+
+	flush_scheduled_work();
+
+	/* FIXME: not sure if this is necessary - will already have
+	 * been deleted by the state machine, just want to make sure
+	 * its not running any more */
+	del_timer_sync(&cnx->ack_timer);
+
+	if (cnx->num_events > 0)
+		mf_deallocate_lp_events(cnx->remote_lp,
+				      HvLpEvent_Type_VirtualLan,
+				      cnx->num_events,
+				      NULL, NULL);
+	if (cnx->num_ack_events > 0)
+		mf_deallocate_lp_events(cnx->remote_lp,
+				      HvLpEvent_Type_VirtualLan,
+				      cnx->num_ack_events,
+				      NULL, NULL);
+}
+
+static void veth_destroy_connection(u8 rlp)
+{
+	struct veth_lpar_connection *cnx = veth_cnx[rlp];
+
+	if (! cnx)
+		return;
+
+	kfree(cnx->msgs);
+	kfree(cnx);
+	veth_cnx[rlp] = NULL;
+}
+
+/*
+ * net_device code
+ */
+
+static int veth_open(struct net_device *dev)
+{
+	struct veth_port *port = (struct veth_port *) dev->priv;
+
+	memset(&port->stats, 0, sizeof (port->stats));
+	netif_start_queue(dev);
+	return 0;
+}
+
+static int veth_close(struct net_device *dev)
+{
+	netif_stop_queue(dev);
+	return 0;
+}
+
+static struct net_device_stats *veth_get_stats(struct net_device *dev)
+{
+	struct veth_port *port = (struct veth_port *) dev->priv;
+
+	return &port->stats;
+}
+
+static int veth_change_mtu(struct net_device *dev, int new_mtu)
+{
+	if ((new_mtu < 68) || (new_mtu > VETH_MAX_MTU))
+		return -EINVAL;
+	dev->mtu = new_mtu;
+	return 0;
+}
+
+static void veth_set_multicast_list(struct net_device *dev)
+{
+	struct veth_port *port = (struct veth_port *) dev->priv;
+	unsigned long flags;
+
+	write_lock_irqsave(&port->mcast_gate, flags);
+
+	if (dev->flags & IFF_PROMISC) {	/* set promiscuous mode */
+		printk(KERN_INFO "%s: Promiscuous mode enabled.\n",
+		       dev->name);
+		port->promiscuous = 1;
+	} else if ( (dev->flags & IFF_ALLMULTI)
+		    || (dev->mc_count > VETH_MAX_MCAST) ) {
+		port->all_mcast = 1;
+	} else {
+		struct dev_mc_list *dmi = dev->mc_list;
+		int i;
+
+		/* Update table */
+		port->num_mcast = 0;
+
+		for (i = 0; i < dev->mc_count; i++) {
+			u8 *addr = dmi->dmi_addr;
+			u64 xaddr = 0;
+
+			if (addr[0] & 0x01) {/* multicast address? */
+				memcpy(&xaddr, addr, ETH_ALEN);
+				port->mcast_addr[port->num_mcast] = xaddr;
+				port->num_mcast++;
+			}
+			dmi = dmi->next;
+		}
+	}
+
+	write_unlock_irqrestore(&port->mcast_gate, flags);
+}
+
+static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
+{
+	strncpy(info->driver, "veth", sizeof(info->driver) - 1);
+	info->driver[sizeof(info->driver) - 1] = '\0';
+	strncpy(info->version, "1.0", sizeof(info->version) - 1);
+}
+
+static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
+{
+	ecmd->supported = (SUPPORTED_1000baseT_Full
+			  | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
+	ecmd->advertising = (SUPPORTED_1000baseT_Full
+			    | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
+	ecmd->port = PORT_FIBRE;
+	ecmd->transceiver = XCVR_INTERNAL;
+	ecmd->phy_address = 0;
+	ecmd->speed = SPEED_1000;
+	ecmd->duplex = DUPLEX_FULL;
+	ecmd->autoneg = AUTONEG_ENABLE;
+	ecmd->maxtxpkt = 120;
+	ecmd->maxrxpkt = 120;
+	return 0;
+}
+
+static u32 veth_get_link(struct net_device *dev)
+{
+	return 1;
+}
+
+static struct ethtool_ops ops = {
+	.get_drvinfo = veth_get_drvinfo,
+	.get_settings = veth_get_settings,
+	.get_link = veth_get_link,
+};
+
+static void veth_tx_timeout(struct net_device *dev)
+{
+	struct veth_port *port = (struct veth_port *)dev->priv;
+	struct net_device_stats *stats = &port->stats;
+	unsigned long flags;
+	int i;
+
+	stats->tx_errors++;
+
+	spin_lock_irqsave(&port->pending_gate, flags);
+
+	printk(KERN_WARNING "%s: Tx timeout!  Resetting lp connections: %08x\n",
+	       dev->name, port->pending_lpmask);
+
+	/* If we've timed out the queue must be stopped, which should
+	 * only ever happen when there is a pending packet. */
+	WARN_ON(! port->pending_lpmask);
+
+	for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
+		struct veth_lpar_connection *cnx = veth_cnx[i];
+
+		if (! (port->pending_lpmask & (1<<i)))
+			continue;
+
+		/* If we're pending on it, we must be connected to it,
+		 * so we should certainly have a structure for it. */
+		BUG_ON(! cnx);
+
+		/* Theoretically we could be kicking a connection
+		 * which doesn't deserve it, but in practice if we've
+		 * had a Tx timeout, the pending_lpmask will have
+		 * exactly one bit set - the connection causing the
+		 * problem. */
+		spin_lock(&cnx->lock);
+		cnx->state |= VETH_STATE_RESET;
+		veth_kick_statemachine(cnx);
+		spin_unlock(&cnx->lock);
+	}
+
+	spin_unlock_irqrestore(&port->pending_gate, flags);
+}
+
+static struct net_device * __init veth_probe_one(int vlan, struct device *vdev)
+{
+	struct net_device *dev;
+	struct veth_port *port;
+	int i, rc;
+
+	dev = alloc_etherdev(sizeof (struct veth_port));
+	if (! dev) {
+		veth_error("Unable to allocate net_device structure!\n");
+		return NULL;
+	}
+
+	port = (struct veth_port *) dev->priv;
+
+	spin_lock_init(&port->pending_gate);
+	rwlock_init(&port->mcast_gate);
+
+	for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
+		HvLpVirtualLanIndexMap map;
+
+		if (i == this_lp)
+			continue;
+		map = HvLpConfig_getVirtualLanIndexMapForLp(i);
+		if (map & (0x8000 >> vlan))
+			port->lpar_map |= (1 << i);
+	}
+	port->dev = vdev;
+
+	dev->dev_addr[0] = 0x02;
+	dev->dev_addr[1] = 0x01;
+	dev->dev_addr[2] = 0xff;
+	dev->dev_addr[3] = vlan;
+	dev->dev_addr[4] = 0xff;
+	dev->dev_addr[5] = this_lp;
+
+	dev->mtu = VETH_MAX_MTU;
+
+	memcpy(&port->mac_addr, dev->dev_addr, 6);
+
+	dev->open = veth_open;
+	dev->hard_start_xmit = veth_start_xmit;
+	dev->stop = veth_close;
+	dev->get_stats = veth_get_stats;
+	dev->change_mtu = veth_change_mtu;
+	dev->set_mac_address = NULL;
+	dev->set_multicast_list = veth_set_multicast_list;
+	SET_ETHTOOL_OPS(dev, &ops);
+
+	dev->watchdog_timeo = 2 * (VETH_ACKTIMEOUT * HZ / 1000000);
+	dev->tx_timeout = veth_tx_timeout;
+
+	SET_NETDEV_DEV(dev, vdev);
+
+	rc = register_netdev(dev);
+	if (rc != 0) {
+		veth_printk(KERN_ERR,
+			    "Failed to register ethernet device for vlan %d\n",
+			    vlan);
+		free_netdev(dev);
+		return NULL;
+	}
+
+	veth_printk(KERN_DEBUG, "%s attached to iSeries vlan %d (lpar_map=0x%04x)\n",
+		    dev->name, vlan, port->lpar_map);
+
+	return dev;
+}
+
+/*
+ * Tx path
+ */
+
+static int veth_transmit_to_one(struct sk_buff *skb, HvLpIndex rlp,
+				struct net_device *dev)
+{
+	struct veth_lpar_connection *cnx = veth_cnx[rlp];
+	struct veth_port *port = (struct veth_port *) dev->priv;
+	HvLpEvent_Rc rc;
+	u32 dma_address, dma_length;
+	struct veth_msg *msg = NULL;
+	int err = 0;
+	unsigned long flags;
+
+	if (! cnx) {
+		port->stats.tx_errors++;
+		dev_kfree_skb(skb);
+		return 0;
+	}
+
+	spin_lock_irqsave(&cnx->lock, flags);
+
+	if (! cnx->state & VETH_STATE_READY)
+		goto drop;
+
+	if ((skb->len - 14) > VETH_MAX_MTU)
+		goto drop;
+
+	msg = veth_stack_pop(cnx);
+
+	if (! msg) {
+		err = 1;
+		goto drop;
+	}
+
+	dma_length = skb->len;
+	dma_address = dma_map_single(port->dev, skb->data,
+				     dma_length, DMA_TO_DEVICE);
+
+	if (dma_mapping_error(dma_address))
+		goto recycle_and_drop;
+
+	/* Is it really necessary to check the length and address
+	 * fields of the first entry here? */
+	msg->skb = skb;
+	msg->dev = port->dev;
+	msg->data.addr[0] = dma_address;
+	msg->data.len[0] = dma_length;
+	msg->data.eofmask = 1 << VETH_EOF_SHIFT;
+	set_bit(0, &(msg->in_use));
+	rc = veth_signaldata(cnx, VethEventTypeFrames, msg->token, &msg->data);
+
+	if (rc != HvLpEvent_Rc_Good)
+		goto recycle_and_drop;
+
+	spin_unlock_irqrestore(&cnx->lock, flags);
+	return 0;
+
+ recycle_and_drop:
+	msg->skb = NULL;
+	/* need to set in use to make veth_recycle_msg in case this
+	 * was a mapping failure */
+	set_bit(0, &msg->in_use);
+	veth_recycle_msg(cnx, msg);
+ drop:
+	port->stats.tx_errors++;
+	dev_kfree_skb(skb);
+	spin_unlock_irqrestore(&cnx->lock, flags);
+	return err;
+}
+
+static HvLpIndexMap veth_transmit_to_many(struct sk_buff *skb,
+					  HvLpIndexMap lpmask,
+					  struct net_device *dev)
+{
+	struct veth_port *port = (struct veth_port *) dev->priv;
+	int i;
+	int rc;
+
+	for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
+		if ((lpmask & (1 << i)) == 0)
+			continue;
+
+		rc = veth_transmit_to_one(skb_get(skb), i, dev);
+		if (! rc)
+			lpmask &= ~(1<<i);
+	}
+
+	if (! lpmask) {
+		port->stats.tx_packets++;
+		port->stats.tx_bytes += skb->len;
+	}
+
+	return lpmask;
+}
+
+static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	unsigned char *frame = skb->data;
+	struct veth_port *port = (struct veth_port *) dev->priv;
+	unsigned long flags;
+	HvLpIndexMap lpmask;
+
+	if (! (frame[0] & 0x01)) {
+		/* unicast packet */
+		HvLpIndex rlp = frame[5];
+
+		if ( ! ((1 << rlp) & port->lpar_map) ) {
+			dev_kfree_skb(skb);
+			return 0;
+		}
+
+		lpmask = 1 << rlp;
+	} else {
+		lpmask = port->lpar_map;
+	}
+
+	spin_lock_irqsave(&port->pending_gate, flags);
+
+	lpmask = veth_transmit_to_many(skb, lpmask, dev);
+
+	if (! lpmask) {
+		dev_kfree_skb(skb);
+	} else {
+		if (port->pending_skb) {
+			veth_error("%s: Tx while skb was pending!\n",
+				   dev->name);
+			dev_kfree_skb(skb);
+			spin_unlock_irqrestore(&port->pending_gate, flags);
+			return 1;
+		}
+
+		port->pending_skb = skb;
+		port->pending_lpmask = lpmask;
+		netif_stop_queue(dev);
+	}
+
+	spin_unlock_irqrestore(&port->pending_gate, flags);
+
+	return 0;
+}
+
+static void veth_recycle_msg(struct veth_lpar_connection *cnx,
+			     struct veth_msg *msg)
+{
+	u32 dma_address, dma_length;
+
+	if (test_and_clear_bit(0, &msg->in_use)) {
+		dma_address = msg->data.addr[0];
+		dma_length = msg->data.len[0];
+
+		dma_unmap_single(msg->dev, dma_address, dma_length,
+				 DMA_TO_DEVICE);
+
+		if (msg->skb) {
+			dev_kfree_skb_any(msg->skb);
+			msg->skb = NULL;
+		}
+
+		memset(&msg->data, 0, sizeof(msg->data));
+		veth_stack_push(cnx, msg);
+	} else
+		if (cnx->state & VETH_STATE_OPEN)
+			veth_error("Bogus frames ack from lpar %d (#%d)\n",
+				   cnx->remote_lp, msg->token);
+}
+
+static void veth_flush_pending(struct veth_lpar_connection *cnx)
+{
+	int i;
+	for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
+		struct net_device *dev = veth_dev[i];
+		struct veth_port *port;
+		unsigned long flags;
+
+		if (! dev)
+			continue;
+
+		port = (struct veth_port *)dev->priv;
+
+		if (! (port->lpar_map & (1<<cnx->remote_lp)))
+			continue;
+
+		spin_lock_irqsave(&port->pending_gate, flags);
+		if (port->pending_skb) {
+			port->pending_lpmask =
+				veth_transmit_to_many(port->pending_skb,
+						      port->pending_lpmask,
+						      dev);
+			if (! port->pending_lpmask) {
+				dev_kfree_skb_any(port->pending_skb);
+				port->pending_skb = NULL;
+				netif_wake_queue(dev);
+			}
+		}
+		spin_unlock_irqrestore(&port->pending_gate, flags);
+	}
+}
+
+/*
+ * Rx path
+ */
+
+static inline int veth_frame_wanted(struct veth_port *port, u64 mac_addr)
+{
+	int wanted = 0;
+	int i;
+	unsigned long flags;
+
+	if ( (mac_addr == port->mac_addr) || (mac_addr == 0xffffffffffff0000) )
+		return 1;
+
+	if (! (((char *) &mac_addr)[0] & 0x01))
+		return 0;
+
+	read_lock_irqsave(&port->mcast_gate, flags);
+
+	if (port->promiscuous || port->all_mcast) {
+		wanted = 1;
+		goto out;
+	}
+
+	for (i = 0; i < port->num_mcast; ++i) {
+		if (port->mcast_addr[i] == mac_addr) {
+			wanted = 1;
+			break;
+		}
+	}
+
+ out:
+	read_unlock_irqrestore(&port->mcast_gate, flags);
+
+	return wanted;
+}
+
+struct dma_chunk {
+	u64 addr;
+	u64 size;
+};
+
+#define VETH_MAX_PAGES_PER_FRAME ( (VETH_MAX_MTU+PAGE_SIZE-2)/PAGE_SIZE + 1 )
+
+static inline void veth_build_dma_list(struct dma_chunk *list,
+				       unsigned char *p, unsigned long length)
+{
+	unsigned long done;
+	int i = 1;
+
+	/* FIXME: skbs are continguous in real addresses.  Do we
+	 * really need to break it into PAGE_SIZE chunks, or can we do
+	 * it just at the granularity of iSeries real->absolute
+	 * mapping?  Indeed, given the way the allocator works, can we
+	 * count on them being absolutely contiguous? */
+	list[0].addr = ISERIES_HV_ADDR(p);
+	list[0].size = min(length,
+			   PAGE_SIZE - ((unsigned long)p & ~PAGE_MASK));
+
+	done = list[0].size;
+	while (done < length) {
+		list[i].addr = ISERIES_HV_ADDR(p + done);
+		list[i].size = min(length-done, PAGE_SIZE);
+		done += list[i].size;
+		i++;
+	}
+}
+
+static void veth_flush_acks(struct veth_lpar_connection *cnx)
+{
+	HvLpEvent_Rc rc;
+
+	rc = veth_signaldata(cnx, VethEventTypeFramesAck,
+			     0, &cnx->pending_acks);
+
+	if (rc != HvLpEvent_Rc_Good)
+		veth_error("Error 0x%x acking frames from lpar %d!\n",
+			   (unsigned)rc, cnx->remote_lp);
+
+	cnx->num_pending_acks = 0;
+	memset(&cnx->pending_acks, 0xff, sizeof(cnx->pending_acks));
+}
+
+static void veth_receive(struct veth_lpar_connection *cnx,
+			 struct VethLpEvent *event)
+{
+	struct VethFramesData *senddata = &event->u.frames_data;
+	int startchunk = 0;
+	int nchunks;
+	unsigned long flags;
+	HvLpDma_Rc rc;
+
+	do {
+		u16 length = 0;
+		struct sk_buff *skb;
+		struct dma_chunk local_list[VETH_MAX_PAGES_PER_FRAME];
+		struct dma_chunk remote_list[VETH_MAX_FRAMES_PER_MSG];
+		u64 dest;
+		HvLpVirtualLanIndex vlan;
+		struct net_device *dev;
+		struct veth_port *port;
+
+		/* FIXME: do we need this? */
+		memset(local_list, 0, sizeof(local_list));
+		memset(remote_list, 0, sizeof(VETH_MAX_FRAMES_PER_MSG));
+
+		/* a 0 address marks the end of the valid entries */
+		if (senddata->addr[startchunk] == 0)
+			break;
+
+		/* make sure that we have at least 1 EOF entry in the
+		 * remaining entries */
+		if (! (senddata->eofmask >> (startchunk + VETH_EOF_SHIFT))) {
+			veth_error("missing EOF frag in event "
+				   "eofmask=0x%x startchunk=%d\n",
+				   (unsigned) senddata->eofmask, startchunk);
+			break;
+		}
+
+		/* build list of chunks in this frame */
+		nchunks = 0;
+		do {
+			remote_list[nchunks].addr =
+				(u64) senddata->addr[startchunk+nchunks] << 32;
+			remote_list[nchunks].size =
+				senddata->len[startchunk+nchunks];
+			length += remote_list[nchunks].size;
+		} while (! (senddata->eofmask &
+			    (1 << (VETH_EOF_SHIFT + startchunk + nchunks++))));
+
+		/* length == total length of all chunks */
+		/* nchunks == # of chunks in this frame */
+
+		if ((length - ETH_HLEN) > VETH_MAX_MTU) {
+			veth_error("Received oversize frame from lpar %d "
+				   "(length=%d)\n", cnx->remote_lp, length);
+			continue;
+		}
+
+		skb = alloc_skb(length, GFP_ATOMIC);
+		if (!skb)
+			continue;
+
+		veth_build_dma_list(local_list, skb->data, length);
+
+		rc = HvCallEvent_dmaBufList(HvLpEvent_Type_VirtualLan,
+					    event->base_event.xSourceLp,
+					    HvLpDma_Direction_RemoteToLocal,
+					    cnx->src_inst,
+					    cnx->dst_inst,
+					    HvLpDma_AddressType_RealAddress,
+					    HvLpDma_AddressType_TceIndex,
+					    ISERIES_HV_ADDR(&local_list),
+					    ISERIES_HV_ADDR(&remote_list),
+					    length);
+		if (rc != HvLpDma_Rc_Good) {
+			dev_kfree_skb_irq(skb);
+			continue;
+		}
+
+		vlan = skb->data[9];
+		dev = veth_dev[vlan];
+		if (! dev)
+			/* Some earlier versions of the driver sent
+			   broadcasts down all connections, even to
+			   lpars that weren't on the relevant vlan.
+			   So ignore packets belonging to a vlan we're
+			   not on. */
+			continue;
+
+		port = (struct veth_port *)dev->priv;
+		dest = *((u64 *) skb->data) & 0xFFFFFFFFFFFF0000;
+
+		if ((vlan > HVMAXARCHITECTEDVIRTUALLANS) || !port) {
+			dev_kfree_skb_irq(skb);
+			continue;
+		}
+		if (! veth_frame_wanted(port, dest)) {
+			dev_kfree_skb_irq(skb);
+			continue;
+		}
+
+		skb_put(skb, length);
+		skb->dev = dev;
+		skb->protocol = eth_type_trans(skb, dev);
+		skb->ip_summed = CHECKSUM_NONE;
+		netif_rx(skb);	/* send it up */
+		port->stats.rx_packets++;
+		port->stats.rx_bytes += length;
+	} while (startchunk += nchunks, startchunk < VETH_MAX_FRAMES_PER_MSG);
+
+	/* Ack it */
+	spin_lock_irqsave(&cnx->lock, flags);
+	BUG_ON(cnx->num_pending_acks > VETH_MAX_ACKS_PER_MSG);
+
+	cnx->pending_acks[cnx->num_pending_acks++] =
+		event->base_event.xCorrelationToken;
+
+	if ( (cnx->num_pending_acks >= cnx->remote_caps.ack_threshold)
+	     || (cnx->num_pending_acks >= VETH_MAX_ACKS_PER_MSG) )
+		veth_flush_acks(cnx);
+
+	spin_unlock_irqrestore(&cnx->lock, flags);
+}
+
+static void veth_timed_ack(unsigned long ptr)
+{
+	struct veth_lpar_connection *cnx = (struct veth_lpar_connection *) ptr;
+	unsigned long flags;
+
+	/* Ack all the events */
+	spin_lock_irqsave(&cnx->lock, flags);
+	if (cnx->num_pending_acks > 0)
+		veth_flush_acks(cnx);
+
+	/* Reschedule the timer */
+	cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
+	add_timer(&cnx->ack_timer);
+	spin_unlock_irqrestore(&cnx->lock, flags);
+}
+
+static int veth_remove(struct vio_dev *vdev)
+{
+	int i = vdev->unit_address;
+	struct net_device *dev;
+
+	dev = veth_dev[i];
+	if (dev != NULL) {
+		veth_dev[i] = NULL;
+		unregister_netdev(dev);
+		free_netdev(dev);
+	}
+	return 0;
+}
+
+static int veth_probe(struct vio_dev *vdev, const struct vio_device_id *id)
+{
+	int i = vdev->unit_address;
+	struct net_device *dev;
+
+	dev = veth_probe_one(i, &vdev->dev);
+	if (dev == NULL) {
+		veth_remove(vdev);
+		return 1;
+	}
+	veth_dev[i] = dev;
+
+	/* Start the state machine on each connection, to commence
+	 * link negotiation */
+	for (i = 0; i < HVMAXARCHITECTEDLPS; i++)
+		if (veth_cnx[i])
+			veth_kick_statemachine(veth_cnx[i]);
+
+	return 0;
+}
+
+/**
+ * veth_device_table: Used by vio.c to match devices that we
+ * support.
+ */
+static struct vio_device_id veth_device_table[] __devinitdata = {
+	{ "vlan", "" },
+	{ NULL, NULL }
+};
+MODULE_DEVICE_TABLE(vio, veth_device_table);
+
+static struct vio_driver veth_driver = {
+	.name = "iseries_veth",
+	.id_table = veth_device_table,
+	.probe = veth_probe,
+	.remove = veth_remove
+};
+
+/*
+ * Module initialization/cleanup
+ */
+
+void __exit veth_module_cleanup(void)
+{
+	int i;
+
+	vio_unregister_driver(&veth_driver);
+
+	for (i = 0; i < HVMAXARCHITECTEDLPS; ++i)
+		veth_stop_connection(i);
+
+	HvLpEvent_unregisterHandler(HvLpEvent_Type_VirtualLan);
+
+	/* Hypervisor callbacks may have scheduled more work while we
+	 * were destroying connections. Now that we've disconnected from
+	 * the hypervisor make sure everything's finished. */
+	flush_scheduled_work();
+
+	for (i = 0; i < HVMAXARCHITECTEDLPS; ++i)
+		veth_destroy_connection(i);
+
+}
+module_exit(veth_module_cleanup);
+
+int __init veth_module_init(void)
+{
+	int i;
+	int rc;
+
+	this_lp = HvLpConfig_getLpIndex_outline();
+
+	for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
+		rc = veth_init_connection(i);
+		if (rc != 0) {
+			veth_module_cleanup();
+			return rc;
+		}
+	}
+
+	HvLpEvent_registerHandler(HvLpEvent_Type_VirtualLan,
+				  &veth_handle_event);
+
+	return vio_register_driver(&veth_driver);
+}
+module_init(veth_module_init);