[PATCH] PPC64: iSeries virtual ethernet driver

From: Stephen Rothwell <sfr@canb.auug.org.au>

This is the iSeries virtual ethernet driver.  David Gibson has taken you
previous comments and hopefully sitisfied most of them.  The driver has
also undergone some more testing which showed up some bugs which have been
addressed.

Unfortunately, Anton is about to submit some other patches of mine which
will sightly comflict with this.  I will send a patch shortly that will
(hopefully) fix that.

drivers/net/Kconfig

@@ -2104,7 +2104,7 @@ config IXGB_NAPI
 endmenu
 
 
-config VETH
+config ISERIES_VETH
 	tristate "iSeries Virtual Ethernet driver support"
 	depends on NETDEVICES && PPC_ISERIES
 

drivers/net/Makefile

@@ -45,6 +45,7 @@ obj-$(CONFIG_SIS190) += sis190.o
 obj-$(CONFIG_SIS900) += sis900.o
 obj-$(CONFIG_YELLOWFIN) += yellowfin.o
 obj-$(CONFIG_ACENIC) += acenic.o
+obj-$(CONFIG_ISERIES_VETH) += iseries_veth.o
 obj-$(CONFIG_NATSEMI) += natsemi.o
 obj-$(CONFIG_NS83820) += ns83820.o
 obj-$(CONFIG_STNIC) += stnic.o 8390.o

drivers/net/iseries_veth.c

+/* 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/pci.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 "iseries_veth.h"
+
+extern struct pci_dev *iSeries_veth_dev;
+
+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 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 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_allocateLpEvents(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);
+	}
+
+	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_destroy_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_deallocateLpEvents(cnx->remote_lp,
+				      HvLpEvent_Type_VirtualLan,
+				      cnx->num_events,
+				      NULL, NULL);
+	if (cnx->num_ack_events > 0)
+		mf_deallocateLpEvents(cnx->remote_lp,
+				      HvLpEvent_Type_VirtualLan,
+				      cnx->num_ack_events,
+				      NULL, NULL);
+
+	if (cnx->msgs)
+		kfree(cnx->msgs);
+}
+
+/*
+ * 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 int veth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+#ifdef SIOCETHTOOL
+	struct ethtool_cmd ecmd;
+
+	if (cmd != SIOCETHTOOL)
+		return -EOPNOTSUPP;
+	if (copy_from_user(&ecmd, ifr->ifr_data, sizeof (ecmd)))
+		return -EFAULT;
+	switch (ecmd.cmd) {
+	case ETHTOOL_GSET:
+		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;
+		if (copy_to_user(ifr->ifr_data, &ecmd, sizeof(ecmd)))
+			return -EFAULT;
+		return 0;
+
+	case ETHTOOL_GDRVINFO:{
+			struct ethtool_drvinfo info = { ETHTOOL_GDRVINFO };
+			strncpy(info.driver, "veth", sizeof(info.driver) - 1);
+			info.driver[sizeof(info.driver) - 1] = '\0';
+			strncpy(info.version, "1.0", sizeof(info.version) - 1);
+			if (copy_to_user(ifr->ifr_data, &info, sizeof(info)))
+				return -EFAULT;
+			return 0;
+		}
+		/* get link status */
+	case ETHTOOL_GLINK:{
+			struct ethtool_value edata = { ETHTOOL_GLINK };
+			edata.data = 1;
+			if (copy_to_user(ifr->ifr_data, &edata, sizeof(edata)))
+				return -EFAULT;
+			return 0;
+		}
+
+	default:
+		break;
+	}
+
+#endif
+	return -EOPNOTSUPP;
+}
+
+struct net_device * __init veth_probe_one(int vlan)
+{
+	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);
+	}
+
+	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;
+	dev->do_ioctl = veth_ioctl;
+
+	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 = pci_map_single(iSeries_veth_dev, skb->data,
+				     dma_length, PCI_DMA_TODEVICE);
+
+	if (pci_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->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++) {
+		struct sk_buff *clone;
+
+		if (! lpmask & (1<<i))
+			continue;
+
+		clone = skb_clone(skb, GFP_ATOMIC);
+		if (! clone) {
+			veth_error("%s: skb_clone failed %p\n",
+				   dev->name, skb);
+			continue;
+		}
+
+		rc = veth_transmit_to_one(clone, 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;
+	}
+
+	lpmask = veth_transmit_to_many(skb, lpmask, dev);
+
+	if (! lpmask) {
+		dev_kfree_skb(skb);
+	} else {
+		spin_lock_irqsave(&port->pending_gate, flags);
+		if (port->pending_skb) {
+			veth_error("%s: Tx while skb was pending!\n",
+				   dev->name);
+			dev_kfree_skb(skb);
+			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];
+
+		pci_unmap_single(iSeries_veth_dev, dma_address, dma_length,
+				 PCI_DMA_TODEVICE);
+
+		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_start_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);
+}
+
+/*
+ * Module initialization/cleanup
+ */
+
+void __exit veth_module_cleanup(void)
+{
+	int i;
+
+	for (i = 0; i < HVMAXARCHITECTEDLPS; ++i)
+		veth_destroy_connection(i);
+
+	HvLpEvent_unregisterHandler(HvLpEvent_Type_VirtualLan);
+
+	for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; ++i) {
+		struct net_device *dev = veth_dev[i];
+
+		if (! dev)
+			continue;
+
+		veth_dev[i] = NULL;
+		unregister_netdev(dev);
+		free_netdev(dev);
+	}
+}
+module_exit(veth_module_cleanup);
+
+int __init veth_module_init(void)
+{
+	HvLpIndexMap vlan_map = HvLpConfig_getVirtualLanIndexMap();
+	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;
+		}
+	}
+
+	for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; ++i) {
+		struct net_device *dev;
+
+		if (! (vlan_map & (0x8000 >> i)))
+			continue;
+
+		dev = veth_probe_one(i);
+
+		if (! dev) {
+			veth_module_cleanup();
+			return rc;
+		}
+
+		veth_dev[i] = dev;
+	}
+
+	HvLpEvent_registerHandler(HvLpEvent_Type_VirtualLan,
+				  &veth_handle_event);
+
+	/* 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;
+}
+module_init(veth_module_init);

drivers/net/iseries_veth.h

+/* File veth.h created by Kyle A. Lucke on Mon Aug  7 2000. */
+
+#ifndef _ISERIES_VETH_H
+#define _ISERIES_VETH_H
+
+#define VethEventTypeCap	(0)
+#define VethEventTypeFrames	(1)
+#define VethEventTypeMonitor	(2)
+#define VethEventTypeFramesAck	(3)
+
+#define VETH_MAX_ACKS_PER_MSG	(20)
+#define VETH_MAX_FRAMES_PER_MSG	(6)
+
+struct VethFramesData {
+	u32 addr[VETH_MAX_FRAMES_PER_MSG];
+	u16 len[VETH_MAX_FRAMES_PER_MSG];
+	u32 eofmask;
+};
+#define VETH_EOF_SHIFT		(32-VETH_MAX_FRAMES_PER_MSG)
+
+struct VethFramesAckData {
+	u16 token[VETH_MAX_ACKS_PER_MSG];
+};
+
+struct VethCapData {
+	u8 caps_version;
+	u8 rsvd1;
+	u16 num_buffers;
+	u16 ack_threshold;
+	u16 rsvd2;
+	u32 ack_timeout;
+	u32 rsvd3;
+	u64 rsvd4[3];
+};
+
+struct VethLpEvent {
+	struct HvLpEvent base_event;
+	union {
+		struct VethCapData caps_data;
+		struct VethFramesData frames_data;
+		struct VethFramesAckData frames_ack_data;
+	} u;
+
+};
+
+#define HVMAXARCHITECTEDVIRTUALLANS (16)
+
+#endif	/* _ISERIES_VETH_H */