patch-2.4.13 linux/drivers/message/i2o/i2o_lan.c

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diff -u --recursive --new-file v2.4.12/linux/drivers/message/i2o/i2o_lan.c linux/drivers/message/i2o/i2o_lan.c
@@ -0,0 +1,1579 @@
+/*
+ *	drivers/i2o/i2o_lan.c
+ *
+ * 	I2O LAN CLASS OSM 		May 26th 2000
+ *
+ *	(C) Copyright 1999, 2000 	University of Helsinki,
+ *		      			Department of Computer Science
+ *
+ * 	This code is still under development / test.
+ *
+ *	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.
+ *
+ *	Authors: 	Auvo Häkkinen <Auvo.Hakkinen@cs.Helsinki.FI>
+ *	Fixes:		Juha Sievänen <Juha.Sievanen@cs.Helsinki.FI>
+ *	 		Taneli Vähäkangas <Taneli.Vahakangas@cs.Helsinki.FI>
+ *			Deepak Saxena <deepak@plexity.net>
+ *
+ *	Tested:		in FDDI environment (using SysKonnect's DDM)
+ *			in Gigabit Eth environment (using SysKonnect's DDM)
+ *			in Fast Ethernet environment (using Intel 82558 DDM)
+ *
+ *	TODO:		tests for other LAN classes (Token Ring, Fibre Channel)
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+
+#include <linux/pci.h>
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/fddidevice.h>
+#include <linux/trdevice.h>
+#include <linux/fcdevice.h>
+
+#include <linux/skbuff.h>
+#include <linux/if_arp.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/tqueue.h>
+#include <asm/io.h>
+
+#include <linux/errno.h>
+
+#include <linux/i2o.h>
+#include "i2o_lan.h"
+
+//#define DRIVERDEBUG
+#ifdef DRIVERDEBUG
+#define dprintk(s, args...) printk(s, ## args)
+#else
+#define dprintk(s, args...)
+#endif
+
+/* The following module parameters are used as default values
+ * for per interface values located in the net_device private area.
+ * Private values are changed via /proc filesystem.
+ */
+static u32 max_buckets_out = I2O_LAN_MAX_BUCKETS_OUT;
+static u32 bucket_thresh   = I2O_LAN_BUCKET_THRESH;
+static u32 rx_copybreak    = I2O_LAN_RX_COPYBREAK;
+static u8  tx_batch_mode   = I2O_LAN_TX_BATCH_MODE;
+static u32 i2o_event_mask  = I2O_LAN_EVENT_MASK;
+
+#define MAX_LAN_CARDS 16
+static struct net_device *i2o_landevs[MAX_LAN_CARDS+1];
+static int unit = -1; 	  /* device unit number */
+
+static void i2o_lan_reply(struct i2o_handler *h, struct i2o_controller *iop, struct i2o_message *m);
+static void i2o_lan_send_post_reply(struct i2o_handler *h, struct i2o_controller *iop, struct i2o_message *m);
+static int i2o_lan_receive_post(struct net_device *dev);
+static void i2o_lan_receive_post_reply(struct i2o_handler *h, struct i2o_controller *iop, struct i2o_message *m);
+static void i2o_lan_release_buckets(struct net_device *dev, u32 *msg);
+
+static int i2o_lan_reset(struct net_device *dev);
+static void i2o_lan_handle_event(struct net_device *dev, u32 *msg);
+
+/* Structures to register handlers for the incoming replies. */
+
+static struct i2o_handler i2o_lan_send_handler = {
+	i2o_lan_send_post_reply, 	// For send replies
+	NULL,
+	NULL,
+	NULL,
+	"I2O LAN OSM send",
+	-1,
+	I2O_CLASS_LAN
+};
+static int lan_send_context;
+
+static struct i2o_handler i2o_lan_receive_handler = {
+	i2o_lan_receive_post_reply,	// For receive replies
+	NULL,
+	NULL,
+	NULL,
+	"I2O LAN OSM receive",
+	-1,
+	I2O_CLASS_LAN
+};
+static int lan_receive_context;
+
+static struct i2o_handler i2o_lan_handler = {
+	i2o_lan_reply,			// For other replies
+	NULL,
+	NULL,
+	NULL,
+	"I2O LAN OSM",
+	-1,
+	I2O_CLASS_LAN
+};
+static int lan_context;
+
+DECLARE_TASK_QUEUE(i2o_post_buckets_task);
+struct tq_struct run_i2o_post_buckets_task = {
+	routine: (void (*)(void *)) run_task_queue,
+	data: (void *) 0
+};
+
+/* Functions to handle message failures and transaction errors:
+==============================================================*/
+
+/*
+ * i2o_lan_handle_failure(): Fail bit has been set since IOP's message
+ * layer cannot deliver the request to the target, or the target cannot
+ * process the request.
+ */
+static void i2o_lan_handle_failure(struct net_device *dev, u32 *msg)
+{
+	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
+	struct i2o_device *i2o_dev = priv->i2o_dev;
+	struct i2o_controller *iop = i2o_dev->controller;
+
+	u32 *preserved_msg = (u32*)(iop->mem_offset + msg[7]);
+	u32 *sgl_elem = &preserved_msg[4];
+	struct sk_buff *skb = NULL;
+	u8 le_flag;
+
+	i2o_report_status(KERN_INFO, dev->name, msg);
+
+	/* If PacketSend failed, free sk_buffs reserved by upper layers */
+
+	if (msg[1] >> 24 == LAN_PACKET_SEND) {
+		do {
+			skb = (struct sk_buff *)(sgl_elem[1]);
+			dev_kfree_skb_irq(skb);
+
+			atomic_dec(&priv->tx_out);
+
+			le_flag = *sgl_elem >> 31;
+			sgl_elem +=3;
+		} while (le_flag == 0); /* Last element flag not set */
+
+		if (netif_queue_stopped(dev))
+			netif_wake_queue(dev);
+	}
+
+	/* If ReceivePost failed, free sk_buffs we have reserved */
+
+	if (msg[1] >> 24 == LAN_RECEIVE_POST) {
+		do {
+			skb = (struct sk_buff *)(sgl_elem[1]);
+			dev_kfree_skb_irq(skb);
+
+			atomic_dec(&priv->buckets_out);
+
+			le_flag = *sgl_elem >> 31;
+			sgl_elem +=3;
+		} while (le_flag == 0); /* Last element flag not set */
+	}
+
+	/* Release the preserved msg frame by resubmitting it as a NOP */
+
+	preserved_msg[0] = THREE_WORD_MSG_SIZE | SGL_OFFSET_0;
+	preserved_msg[1] = I2O_CMD_UTIL_NOP << 24 | HOST_TID << 12 | 0;
+	preserved_msg[2] = 0;
+	i2o_post_message(iop, msg[7]);
+}
+/*
+ * i2o_lan_handle_transaction_error(): IOP or DDM has rejected the request
+ * for general cause (format error, bad function code, insufficient resources,
+ * etc.). We get one transaction_error for each failed transaction.
+ */
+static void i2o_lan_handle_transaction_error(struct net_device *dev, u32 *msg)
+{
+	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
+	struct sk_buff *skb;
+
+	i2o_report_status(KERN_INFO, dev->name, msg);
+
+	/* If PacketSend was rejected, free sk_buff reserved by upper layers */
+
+	if (msg[1] >> 24 == LAN_PACKET_SEND) {
+		skb = (struct sk_buff *)(msg[3]); // TransactionContext
+		dev_kfree_skb_irq(skb);
+		atomic_dec(&priv->tx_out);
+
+		if (netif_queue_stopped(dev))
+			netif_wake_queue(dev);
+ 	}
+
+	/* If ReceivePost was rejected, free sk_buff we have reserved */
+
+	if (msg[1] >> 24 == LAN_RECEIVE_POST) {
+		skb = (struct sk_buff *)(msg[3]);
+		dev_kfree_skb_irq(skb);
+		atomic_dec(&priv->buckets_out);
+	}
+}
+
+/*
+ * i2o_lan_handle_status(): Common parts of handling a not succeeded request
+ * (status != SUCCESS).
+ */
+static int i2o_lan_handle_status(struct net_device *dev, u32 *msg)
+{
+	/* Fail bit set? */
+
+	if (msg[0] & MSG_FAIL) {
+		i2o_lan_handle_failure(dev, msg);
+		return -1;
+	}
+
+	/* Message rejected for general cause? */
+
+	if ((msg[4]>>24) == I2O_REPLY_STATUS_TRANSACTION_ERROR) {
+		i2o_lan_handle_transaction_error(dev, msg);
+		return -1;
+	}
+
+	/* Else have to handle it in the callback function */
+
+	return 0;
+}
+
+/* Callback functions called from the interrupt routine:
+=======================================================*/
+
+/*
+ * i2o_lan_send_post_reply(): Callback function to handle PostSend replies.
+ */
+static void i2o_lan_send_post_reply(struct i2o_handler *h,
+			struct i2o_controller *iop, struct i2o_message *m)
+{
+	u32 *msg = (u32 *)m;
+	u8 unit  = (u8)(msg[2]>>16); // InitiatorContext
+	struct net_device *dev = i2o_landevs[unit];
+	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
+	u8 trl_count  = msg[3] & 0x000000FF;
+
+	if ((msg[4] >> 24) != I2O_REPLY_STATUS_SUCCESS) {
+		if (i2o_lan_handle_status(dev, msg))
+			return;
+	}
+
+#ifdef DRIVERDEBUG
+	i2o_report_status(KERN_INFO, dev->name, msg);
+#endif
+
+	/* DDM has handled transmit request(s), free sk_buffs.
+	 * We get similar single transaction reply also in error cases 
+	 * (except if msg failure or transaction error).
+	 */
+	while (trl_count) {
+		dev_kfree_skb_irq((struct sk_buff *)msg[4 + trl_count]);
+		dprintk(KERN_INFO "%s: tx skb freed (trl_count=%d).\n",
+			dev->name, trl_count);
+		atomic_dec(&priv->tx_out);
+		trl_count--;
+	}
+
+	/* If priv->tx_out had reached tx_max_out, the queue was stopped */
+
+	if (netif_queue_stopped(dev))
+ 		netif_wake_queue(dev);
+}
+
+/*
+ * i2o_lan_receive_post_reply(): Callback function to process incoming packets.
+ */
+static void i2o_lan_receive_post_reply(struct i2o_handler *h,
+			struct i2o_controller *iop, struct i2o_message *m)
+{
+	u32 *msg = (u32 *)m;
+	u8 unit  = (u8)(msg[2]>>16); // InitiatorContext
+	struct net_device *dev = i2o_landevs[unit];
+
+	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
+	struct i2o_bucket_descriptor *bucket = (struct i2o_bucket_descriptor *)&msg[6];
+	struct i2o_packet_info *packet;
+	u8 trl_count = msg[3] & 0x000000FF;
+	struct sk_buff *skb, *old_skb;
+	unsigned long flags = 0;
+
+	if ((msg[4] >> 24) != I2O_REPLY_STATUS_SUCCESS) {
+		if (i2o_lan_handle_status(dev, msg))
+			return;
+
+		i2o_lan_release_buckets(dev, msg);
+		return;
+	}
+
+#ifdef DRIVERDEBUG
+	i2o_report_status(KERN_INFO, dev->name, msg);
+#endif
+
+	/* Else we are receiving incoming post. */
+
+	while (trl_count--) {
+		skb = (struct sk_buff *)bucket->context;
+		packet = (struct i2o_packet_info *)bucket->packet_info;
+		atomic_dec(&priv->buckets_out);
+
+		/* Sanity checks: Any weird characteristics in bucket? */
+
+		if (packet->flags & 0x0f || ! packet->flags & 0x40) {
+			if (packet->flags & 0x01)
+				printk(KERN_WARNING "%s: packet with errors, error code=0x%02x.\n",
+					dev->name, packet->status & 0xff);
+
+			/* The following shouldn't happen, unless parameters in
+			 * LAN_OPERATION group are changed during the run time.
+			 */
+			 if (packet->flags & 0x0c)
+				printk(KERN_DEBUG "%s: multi-bucket packets not supported!\n", 
+					dev->name);
+					
+			if (! packet->flags & 0x40)
+				printk(KERN_DEBUG "%s: multiple packets in a bucket not supported!\n", 
+					dev->name);
+
+			dev_kfree_skb_irq(skb);
+
+			bucket++;
+			continue;
+		}
+
+		/* Copy short packet to a new skb */
+		
+		if (packet->len < priv->rx_copybreak) {
+			old_skb = skb;
+			skb = (struct sk_buff *)dev_alloc_skb(packet->len+2);
+			if (skb == NULL) {
+				printk(KERN_ERR "%s: Can't allocate skb.\n", dev->name);
+				return;
+			}
+			skb_reserve(skb, 2);
+			memcpy(skb_put(skb, packet->len), old_skb->data, packet->len);
+
+			spin_lock_irqsave(&priv->fbl_lock, flags);
+			if (priv->i2o_fbl_tail < I2O_LAN_MAX_BUCKETS_OUT)
+				priv->i2o_fbl[++priv->i2o_fbl_tail] = old_skb;
+			else
+				dev_kfree_skb_irq(old_skb);
+
+			spin_unlock_irqrestore(&priv->fbl_lock, flags);
+		} else
+			skb_put(skb, packet->len);
+
+		/* Deliver to upper layers */
+
+		skb->dev = dev;
+		skb->protocol = priv->type_trans(skb, dev);
+		netif_rx(skb);
+
+		dev->last_rx = jiffies;
+
+		dprintk(KERN_INFO "%s: Incoming packet (%d bytes) delivered "
+			"to upper level.\n", dev->name, packet->len);
+
+		bucket++; // to next Packet Descriptor Block
+	}
+
+#ifdef DRIVERDEBUG
+	if (msg[5] == 0)
+		printk(KERN_INFO "%s: DDM out of buckets (priv->count = %d)!\n",
+		       dev->name, atomic_read(&priv->buckets_out));
+#endif
+
+	/* If DDM has already consumed bucket_thresh buckets, post new ones */
+
+	if (atomic_read(&priv->buckets_out) <= priv->max_buckets_out - priv->bucket_thresh) {
+		run_i2o_post_buckets_task.data = (void *)dev;
+		queue_task(&run_i2o_post_buckets_task, &tq_immediate);
+		mark_bh(IMMEDIATE_BH);
+	}
+
+	return;
+}
+
+/*
+ * i2o_lan_reply(): Callback function to handle other incoming messages
+ * except SendPost and ReceivePost.
+ */
+static void i2o_lan_reply(struct i2o_handler *h, struct i2o_controller *iop,
+			  struct i2o_message *m)
+{
+	u32 *msg = (u32 *)m;
+	u8 unit  = (u8)(msg[2]>>16); // InitiatorContext
+	struct net_device *dev = i2o_landevs[unit];
+
+	if ((msg[4] >> 24) != I2O_REPLY_STATUS_SUCCESS) {
+		if (i2o_lan_handle_status(dev, msg))
+			return;
+
+		/* In other error cases just report and continue */
+
+		i2o_report_status(KERN_INFO, dev->name, msg);
+	}
+
+#ifdef DRIVERDEBUG
+	i2o_report_status(KERN_INFO, dev->name, msg);
+#endif
+	switch (msg[1] >> 24) {
+		case LAN_RESET:
+		case LAN_SUSPEND:
+			/* default reply without payload */
+		break;
+
+		case I2O_CMD_UTIL_EVT_REGISTER: 
+		case I2O_CMD_UTIL_EVT_ACK:
+			i2o_lan_handle_event(dev, msg);
+		break;
+
+		case I2O_CMD_UTIL_PARAMS_SET:
+			/* default reply, results in ReplyPayload (not examined) */
+			switch (msg[3] >> 16) {
+			    case 1: dprintk(KERN_INFO "%s: Reply to set MAC filter mask.\n",
+					dev->name);
+			    break;
+			    case 2: dprintk(KERN_INFO "%s: Reply to set MAC table.\n", 
+					dev->name);
+			    break;
+			    default: printk(KERN_WARNING "%s: Bad group 0x%04X\n",
+			 		dev->name,msg[3] >> 16);
+			}
+		break;
+
+		default:
+			printk(KERN_ERR "%s: No handler for the reply.\n",
+		       		dev->name);
+			i2o_report_status(KERN_INFO, dev->name, msg);
+	}
+}
+
+/* Functions used by the above callback functions:
+=================================================*/
+/*
+ * i2o_lan_release_buckets(): Free unused buckets (sk_buffs).
+ */
+static void i2o_lan_release_buckets(struct net_device *dev, u32 *msg)
+{
+	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
+	u8 trl_elem_size = (u8)(msg[3]>>8 & 0x000000FF);
+	u8 trl_count = (u8)(msg[3] & 0x000000FF);
+	u32 *pskb = &msg[6];
+
+	while (trl_count--) {
+		dprintk(KERN_DEBUG "%s: Releasing unused rx skb %p (trl_count=%d).\n",
+			dev->name, (struct sk_buff*)(*pskb),trl_count+1);
+		dev_kfree_skb_irq((struct sk_buff *)(*pskb));
+		pskb += 1 + trl_elem_size;
+		atomic_dec(&priv->buckets_out);
+	}
+}
+
+/*
+ * i2o_lan_event_reply(): Handle events.
+ */
+static void i2o_lan_handle_event(struct net_device *dev, u32 *msg)
+{
+	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
+	struct i2o_device *i2o_dev = priv->i2o_dev;
+	struct i2o_controller *iop = i2o_dev->controller;
+	u32 max_evt_data_size =iop->status_block->inbound_frame_size-5;
+	struct i2o_reply {
+		u32 header[4];
+		u32 evt_indicator;
+		u32 data[max_evt_data_size];
+	} *evt = (struct i2o_reply *)msg;
+	int evt_data_len = ((msg[0]>>16) - 5) * 4; /* real size*/
+
+	printk(KERN_INFO "%s: I2O event - ", dev->name);
+
+	if (msg[1]>>24 == I2O_CMD_UTIL_EVT_ACK) {
+		printk("Event acknowledgement reply.\n");
+		return;
+	}
+
+	/* Else evt->function == I2O_CMD_UTIL_EVT_REGISTER) */
+
+	switch (evt->evt_indicator) {
+	case I2O_EVT_IND_STATE_CHANGE:  {
+		struct state_data {
+			u16 status;
+			u8 state;
+			u8 data;
+		} *evt_data = (struct state_data *)(evt->data[0]);
+
+		printk("State chance 0x%08x.\n", evt->data[0]);
+
+		/* If the DDM is in error state, recovery may be
+		 * possible if status = Transmit or Receive Control
+		 * Unit Inoperable.
+		 */
+		if (evt_data->state==0x05 && evt_data->status==0x0003)
+			i2o_lan_reset(dev);
+		break;
+	}
+
+	case I2O_EVT_IND_FIELD_MODIFIED: {
+		u16 *work16 = (u16 *)evt->data;
+		printk("Group 0x%04x, field %d changed.\n", work16[0], work16[1]);
+		break;
+	}
+
+	case I2O_EVT_IND_VENDOR_EVT: {
+		int i;
+		printk("Vendor event:\n");
+		for (i = 0; i < evt_data_len / 4; i++)
+			printk("   0x%08x\n", evt->data[i]);
+		break;
+	}
+
+	case I2O_EVT_IND_DEVICE_RESET:
+		/* Spec 2.0 p. 6-121:
+		 * The event of _DEVICE_RESET should also be responded
+		 */
+		printk("Device reset.\n");
+		if (i2o_event_ack(iop, msg) < 0)
+			printk("%s: Event Acknowledge timeout.\n", dev->name);
+		break;
+
+#if 0
+	case I2O_EVT_IND_EVT_MASK_MODIFIED:
+		printk("Event mask modified, 0x%08x.\n", evt->data[0]);
+		break;
+
+	case I2O_EVT_IND_GENERAL_WARNING:
+		printk("General warning 0x%04x.\n", evt->data[0]);
+		break;
+
+	case I2O_EVT_IND_CONFIGURATION_FLAG:
+		printk("Configuration requested.\n");
+		break;
+
+	case I2O_EVT_IND_CAPABILITY_CHANGE:
+		printk("Capability change 0x%04x.\n", evt->data[0]);
+		break;
+
+	case I2O_EVT_IND_DEVICE_STATE:
+		printk("Device state changed 0x%08x.\n", evt->data[0]);
+		break;
+#endif
+	case I2O_LAN_EVT_LINK_DOWN:
+		netif_carrier_off(dev); 
+		printk("Link to the physical device is lost.\n");
+		break;
+
+	case I2O_LAN_EVT_LINK_UP:
+		netif_carrier_on(dev); 
+		printk("Link to the physical device is (re)established.\n");
+		break;
+
+	case I2O_LAN_EVT_MEDIA_CHANGE:
+		printk("Media change.\n");
+		break;
+	default:
+		printk("0x%08x. No handler.\n", evt->evt_indicator);
+	}
+}
+
+/*
+ * i2o_lan_receive_post(): Post buckets to receive packets.
+ */
+static int i2o_lan_receive_post(struct net_device *dev)
+{
+	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
+	struct i2o_device *i2o_dev = priv->i2o_dev;
+	struct i2o_controller *iop = i2o_dev->controller;
+	struct sk_buff *skb;
+	u32 m, *msg;
+	u32 bucket_len = (dev->mtu + dev->hard_header_len);
+	u32 total = priv->max_buckets_out - atomic_read(&priv->buckets_out);
+	u32 bucket_count;
+	u32 *sgl_elem;
+	unsigned long flags;
+
+	/* Send (total/bucket_count) separate I2O requests */
+
+	while (total) {
+		m = I2O_POST_READ32(iop);
+		if (m == 0xFFFFFFFF)
+			return -ETIMEDOUT;
+		msg = (u32 *)(iop->mem_offset + m);
+
+		bucket_count = (total >= priv->sgl_max) ? priv->sgl_max : total;
+		total -= bucket_count;
+		atomic_add(bucket_count, &priv->buckets_out);
+
+		dprintk(KERN_INFO "%s: Sending %d buckets (size %d) to LAN DDM.\n",
+			dev->name, bucket_count, bucket_len);
+
+		/* Fill in the header */
+
+		__raw_writel(I2O_MESSAGE_SIZE(4 + 3 * bucket_count) | SGL_OFFSET_4, msg);
+		__raw_writel(LAN_RECEIVE_POST<<24 | HOST_TID<<12 | i2o_dev->lct_data.tid, msg+1);
+		__raw_writel(priv->unit << 16 | lan_receive_context, msg+2);
+		__raw_writel(bucket_count, msg+3);
+		sgl_elem = &msg[4];
+
+		/* Fill in the payload - contains bucket_count SGL elements */
+
+		while (bucket_count--) {
+			spin_lock_irqsave(&priv->fbl_lock, flags);
+			if (priv->i2o_fbl_tail >= 0)
+				skb = priv->i2o_fbl[priv->i2o_fbl_tail--];
+			else {
+				skb = dev_alloc_skb(bucket_len + 2);
+				if (skb == NULL) {
+					spin_unlock_irqrestore(&priv->fbl_lock, flags);
+					return -ENOMEM;
+				}
+				skb_reserve(skb, 2);
+			}
+			spin_unlock_irqrestore(&priv->fbl_lock, flags);
+
+			__raw_writel(0x51000000 | bucket_len, sgl_elem);
+			__raw_writel((u32)skb,		      sgl_elem+1);
+			__raw_writel(virt_to_bus(skb->data),  sgl_elem+2);
+			sgl_elem += 3;
+		}
+
+		/* set LE flag and post  */
+		__raw_writel(__raw_readl(sgl_elem-3) | 0x80000000, (sgl_elem-3));
+		i2o_post_message(iop, m);
+	}
+
+	return 0;
+}
+
+/* Functions called from the network stack, and functions called by them:
+========================================================================*/
+
+/*
+ * i2o_lan_reset(): Reset the LAN adapter into the operational state and
+ * 	restore it to full operation.
+ */
+static int i2o_lan_reset(struct net_device *dev)
+{
+	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
+	struct i2o_device *i2o_dev = priv->i2o_dev;
+	struct i2o_controller *iop = i2o_dev->controller;
+	u32 msg[5];
+
+	dprintk(KERN_INFO "%s: LAN RESET MESSAGE.\n", dev->name);
+	msg[0] = FIVE_WORD_MSG_SIZE | SGL_OFFSET_0;
+	msg[1] = LAN_RESET<<24 | HOST_TID<<12 | i2o_dev->lct_data.tid;
+	msg[2] = priv->unit << 16 | lan_context; // InitiatorContext
+	msg[3] = 0; 				 // TransactionContext
+	msg[4] = 0;				 // Keep posted buckets
+
+	if (i2o_post_this(iop, msg, sizeof(msg)) < 0)
+		return -ETIMEDOUT;
+
+	return 0;
+}
+
+/*
+ * i2o_lan_suspend(): Put LAN adapter into a safe, non-active state.
+ * 	IOP replies to any LAN class message with status error_no_data_transfer
+ *	/ suspended.
+ */
+static int i2o_lan_suspend(struct net_device *dev)
+{
+	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
+	struct i2o_device *i2o_dev = priv->i2o_dev;
+	struct i2o_controller *iop = i2o_dev->controller;
+	u32 msg[5];
+
+	dprintk(KERN_INFO "%s: LAN SUSPEND MESSAGE.\n", dev->name);
+	msg[0] = FIVE_WORD_MSG_SIZE | SGL_OFFSET_0;
+	msg[1] = LAN_SUSPEND<<24 | HOST_TID<<12 | i2o_dev->lct_data.tid;
+	msg[2] = priv->unit << 16 | lan_context; // InitiatorContext
+	msg[3] = 0; 				 // TransactionContext
+	msg[4] = 1 << 16; 			 // return posted buckets
+
+	if (i2o_post_this(iop, msg, sizeof(msg)) < 0)
+		return -ETIMEDOUT;
+
+	return 0;
+}
+
+/*
+ * i2o_set_ddm_parameters:
+ * These settings are done to ensure proper initial values for DDM.
+ * They can be changed via proc file system or vai configuration utility.
+ */
+static void i2o_set_ddm_parameters(struct net_device *dev)
+{
+	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
+	struct i2o_device *i2o_dev = priv->i2o_dev;
+	struct i2o_controller *iop = i2o_dev->controller;
+	u32 val;
+
+	/*
+	 * When PacketOrphanlimit is set to the maximum packet length,
+	 * the packets will never be split into two separate buckets
+	 */
+	val = dev->mtu + dev->hard_header_len;
+	if (i2o_set_scalar(iop, i2o_dev->lct_data.tid, 0x0004, 2, &val, sizeof(val)) < 0)
+		printk(KERN_WARNING "%s: Unable to set PacketOrphanLimit.\n",
+		       dev->name);
+	else
+		dprintk(KERN_INFO "%s: PacketOrphanLimit set to %d.\n",
+			dev->name, val);
+
+	/* When RxMaxPacketsBucket = 1, DDM puts only one packet into bucket */
+
+	val = 1;
+	if (i2o_set_scalar(iop, i2o_dev->lct_data.tid, 0x0008, 4, &val, sizeof(val)) <0)
+		printk(KERN_WARNING "%s: Unable to set RxMaxPacketsBucket.\n",
+		       dev->name);
+	else
+		dprintk(KERN_INFO "%s: RxMaxPacketsBucket set to %d.\n", 
+			dev->name, val);
+	return;
+}
+
+/* Functions called from the network stack:
+==========================================*/
+
+/*
+ * i2o_lan_open(): Open the device to send/receive packets via
+ * the network device.
+ */
+static int i2o_lan_open(struct net_device *dev)
+{
+	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
+	struct i2o_device *i2o_dev = priv->i2o_dev;
+	struct i2o_controller *iop = i2o_dev->controller;
+	u32 mc_addr_group[64];
+
+	MOD_INC_USE_COUNT;
+
+	if (i2o_claim_device(i2o_dev, &i2o_lan_handler)) {
+		printk(KERN_WARNING "%s: Unable to claim the I2O LAN device.\n", dev->name);
+		MOD_DEC_USE_COUNT;
+		return -EAGAIN;
+	}
+	dprintk(KERN_INFO "%s: I2O LAN device (tid=%d) claimed by LAN OSM.\n",
+		dev->name, i2o_dev->lct_data.tid);
+
+	if (i2o_event_register(iop, i2o_dev->lct_data.tid,
+			       priv->unit << 16 | lan_context, 0, priv->i2o_event_mask) < 0)
+		printk(KERN_WARNING "%s: Unable to set the event mask.\n", dev->name);
+
+	i2o_lan_reset(dev);
+
+	/* Get the max number of multicast addresses */
+
+	if (i2o_query_scalar(iop, i2o_dev->lct_data.tid, 0x0001, -1,
+			     &mc_addr_group, sizeof(mc_addr_group)) < 0 ) {
+		printk(KERN_WARNING "%s: Unable to query LAN_MAC_ADDRESS group.\n", dev->name);
+		MOD_DEC_USE_COUNT;
+		return -EAGAIN;
+	}
+	priv->max_size_mc_table = mc_addr_group[8];
+
+	/* Malloc space for free bucket list to resuse reveive post buckets */
+
+	priv->i2o_fbl = kmalloc(priv->max_buckets_out * sizeof(struct sk_buff *),
+				GFP_KERNEL);
+	if (priv->i2o_fbl == NULL) {
+		MOD_DEC_USE_COUNT;
+		return -ENOMEM;
+	}
+	priv->i2o_fbl_tail = -1;
+	priv->send_active = 0;
+
+	i2o_set_ddm_parameters(dev);
+	i2o_lan_receive_post(dev);
+
+	netif_start_queue(dev);
+
+	return 0;
+}
+
+/*
+ * i2o_lan_close(): End the transfering.
+ */
+static int i2o_lan_close(struct net_device *dev)
+{
+	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
+	struct i2o_device *i2o_dev = priv->i2o_dev;
+	struct i2o_controller *iop = i2o_dev->controller;
+	int ret = 0;
+
+	netif_stop_queue(dev);
+	i2o_lan_suspend(dev);
+
+	if (i2o_event_register(iop, i2o_dev->lct_data.tid,
+			       priv->unit << 16 | lan_context, 0, 0) < 0)
+		printk(KERN_WARNING "%s: Unable to clear the event mask.\n",
+		       dev->name);
+
+	while (priv->i2o_fbl_tail >= 0)
+		dev_kfree_skb(priv->i2o_fbl[priv->i2o_fbl_tail--]);
+
+	kfree(priv->i2o_fbl);
+
+	if (i2o_release_device(i2o_dev, &i2o_lan_handler)) {
+		printk(KERN_WARNING "%s: Unable to unclaim I2O LAN device "
+		       "(tid=%d).\n", dev->name, i2o_dev->lct_data.tid);
+		ret = -EBUSY;
+	}
+
+	MOD_DEC_USE_COUNT;
+
+	return ret;
+}
+
+/*
+ * i2o_lan_tx_timeout(): Tx timeout handler.
+ */
+static void i2o_lan_tx_timeout(struct net_device *dev)
+{
+ 	if (!netif_queue_stopped(dev))
+		netif_start_queue(dev);
+}
+
+/*
+ * i2o_lan_batch_send(): Send packets in batch. 
+ * Both i2o_lan_sdu_send and i2o_lan_packet_send use this.
+ */
+static void i2o_lan_batch_send(struct net_device *dev)
+{
+	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
+	struct i2o_controller *iop = priv->i2o_dev->controller;
+
+	spin_lock_irq(&priv->tx_lock);
+	if (priv->tx_count != 0) {
+		dev->trans_start = jiffies;
+		i2o_post_message(iop, priv->m);
+		dprintk(KERN_DEBUG "%s: %d packets sent.\n", dev->name, priv->tx_count);
+		priv->tx_count = 0;
+	}
+	priv->send_active = 0;
+	spin_unlock_irq(&priv->tx_lock);
+	MOD_DEC_USE_COUNT;
+}
+
+#ifdef CONFIG_NET_FC
+/*
+ * i2o_lan_sdu_send(): Send a packet, MAC header added by the DDM.
+ * Must be supported by Fibre Channel, optional for Ethernet/802.3,
+ * Token Ring, FDDI
+ */
+static int i2o_lan_sdu_send(struct sk_buff *skb, struct net_device *dev)
+{
+	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
+	struct i2o_device *i2o_dev = priv->i2o_dev;
+	struct i2o_controller *iop = i2o_dev->controller;
+	int tickssofar = jiffies - dev->trans_start;
+	u32 m, *msg;
+	u32 *sgl_elem;
+
+	spin_lock_irq(&priv->tx_lock);
+
+	priv->tx_count++;
+	atomic_inc(&priv->tx_out);
+
+	/* 
+	 * If tx_batch_mode = 0x00 forced to immediate mode
+	 * If tx_batch_mode = 0x01 forced to batch mode
+	 * If tx_batch_mode = 0x10 switch automatically, current mode immediate
+	 * If tx_batch_mode = 0x11 switch automatically, current mode batch
+	 *	If gap between two packets is > 0 ticks, switch to immediate
+	 */
+	if (priv->tx_batch_mode >> 1) // switch automatically
+		priv->tx_batch_mode = tickssofar ? 0x02 : 0x03;
+
+	if (priv->tx_count == 1) {
+		m = I2O_POST_READ32(iop);
+		if (m == 0xFFFFFFFF) {
+			spin_unlock_irq(&priv->tx_lock);
+			return 1;
+		}
+		msg = (u32 *)(iop->mem_offset + m);
+		priv->m = m;
+
+		__raw_writel(NINE_WORD_MSG_SIZE | 1<<12 | SGL_OFFSET_4, msg);
+		__raw_writel(LAN_PACKET_SEND<<24 | HOST_TID<<12 | i2o_dev->lct_data.tid, msg+1);
+		__raw_writel(priv->unit << 16 | lan_send_context, msg+2); // InitiatorContext
+		__raw_writel(1 << 30 | 1 << 3, msg+3); 		 	  // TransmitControlWord
+
+		__raw_writel(0xD7000000 | skb->len, msg+4);  	     // MAC hdr included
+		__raw_writel((u32)skb, msg+5);  		     // TransactionContext
+		__raw_writel(virt_to_bus(skb->data), msg+6);
+		__raw_writel((u32)skb->mac.raw, msg+7);
+		__raw_writel((u32)skb->mac.raw+4, msg+8);
+
+		if ((priv->tx_batch_mode & 0x01) && !priv->send_active) {
+			priv->send_active = 1;
+			MOD_INC_USE_COUNT;
+			if (schedule_task(&priv->i2o_batch_send_task) == 0)
+				MOD_DEC_USE_COUNT;
+		}
+	} else {  /* Add new SGL element to the previous message frame */
+
+		msg = (u32 *)(iop->mem_offset + priv->m);
+		sgl_elem = &msg[priv->tx_count * 5 + 1];
+
+		__raw_writel(I2O_MESSAGE_SIZE((__raw_readl(msg)>>16) + 5) | 1<<12 | SGL_OFFSET_4, msg);
+		__raw_writel(__raw_readl(sgl_elem-5) & 0x7FFFFFFF, sgl_elem-5); /* clear LE flag */
+		__raw_writel(0xD5000000 | skb->len, sgl_elem);
+		__raw_writel((u32)skb, sgl_elem+1);
+		__raw_writel(virt_to_bus(skb->data), sgl_elem+2);
+		__raw_writel((u32)(skb->mac.raw), sgl_elem+3);
+		__raw_writel((u32)(skb->mac.raw)+1, sgl_elem+4);
+	}
+
+	/* If tx not in batch mode or frame is full, send immediatelly */
+
+	if (!(priv->tx_batch_mode & 0x01) || priv->tx_count == priv->sgl_max) {
+		dev->trans_start = jiffies;
+		i2o_post_message(iop, priv->m);
+		dprintk(KERN_DEBUG "%s: %d packets sent.\n", dev->name, priv->tx_count);
+		priv->tx_count = 0;
+	}
+
+	/* If DDMs TxMaxPktOut reached, stop queueing layer to send more */
+
+	if (atomic_read(&priv->tx_out) >= priv->tx_max_out)
+		netif_stop_queue(dev);
+
+	spin_unlock_irq(&priv->tx_lock);
+	return 0;
+}
+#endif /* CONFIG_NET_FC */
+
+/*
+ * i2o_lan_packet_send(): Send a packet as is, including the MAC header.
+ *
+ * Must be supported by Ethernet/802.3, Token Ring, FDDI, optional for
+ * Fibre Channel
+ */
+static int i2o_lan_packet_send(struct sk_buff *skb, struct net_device *dev)
+{
+	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
+	struct i2o_device *i2o_dev = priv->i2o_dev;
+	struct i2o_controller *iop = i2o_dev->controller;
+	int tickssofar = jiffies - dev->trans_start;
+	u32 m, *msg;
+	u32 *sgl_elem;
+
+	spin_lock_irq(&priv->tx_lock);
+
+	priv->tx_count++;
+	atomic_inc(&priv->tx_out);
+
+	/* 
+	 * If tx_batch_mode = 0x00 forced to immediate mode
+	 * If tx_batch_mode = 0x01 forced to batch mode
+	 * If tx_batch_mode = 0x10 switch automatically, current mode immediate
+	 * If tx_batch_mode = 0x11 switch automatically, current mode batch
+	 *	If gap between two packets is > 0 ticks, switch to immediate
+	 */
+	if (priv->tx_batch_mode >> 1) // switch automatically
+		priv->tx_batch_mode = tickssofar ? 0x02 : 0x03;
+
+	if (priv->tx_count == 1) {
+		m = I2O_POST_READ32(iop);
+		if (m == 0xFFFFFFFF) {
+			spin_unlock_irq(&priv->tx_lock);
+			return 1;
+		}
+		msg = (u32 *)(iop->mem_offset + m);
+		priv->m = m;
+
+		__raw_writel(SEVEN_WORD_MSG_SIZE | 1<<12 | SGL_OFFSET_4, msg);
+		__raw_writel(LAN_PACKET_SEND<<24 | HOST_TID<<12 | i2o_dev->lct_data.tid, msg+1);
+		__raw_writel(priv->unit << 16 | lan_send_context, msg+2); // InitiatorContext
+		__raw_writel(1 << 30 | 1 << 3, msg+3); 		 	  // TransmitControlWord
+			// bit 30: reply as soon as transmission attempt is complete
+			// bit 3: Suppress CRC generation
+		__raw_writel(0xD5000000 | skb->len, msg+4);  	     // MAC hdr included
+		__raw_writel((u32)skb, msg+5);  		     // TransactionContext
+		__raw_writel(virt_to_bus(skb->data), msg+6);
+
+		if ((priv->tx_batch_mode & 0x01) && !priv->send_active) {
+			priv->send_active = 1;
+			MOD_INC_USE_COUNT;
+			if (schedule_task(&priv->i2o_batch_send_task) == 0)
+				MOD_DEC_USE_COUNT;
+		}
+	} else {  /* Add new SGL element to the previous message frame */
+
+		msg = (u32 *)(iop->mem_offset + priv->m);
+		sgl_elem = &msg[priv->tx_count * 3 + 1];
+
+		__raw_writel(I2O_MESSAGE_SIZE((__raw_readl(msg)>>16) + 3) | 1<<12 | SGL_OFFSET_4, msg);
+		__raw_writel(__raw_readl(sgl_elem-3) & 0x7FFFFFFF, sgl_elem-3); /* clear LE flag */
+		__raw_writel(0xD5000000 | skb->len, sgl_elem);
+		__raw_writel((u32)skb, sgl_elem+1);
+		__raw_writel(virt_to_bus(skb->data), sgl_elem+2);
+	}
+
+	/* If tx is in immediate mode or frame is full, send now */
+
+	if (!(priv->tx_batch_mode & 0x01) || priv->tx_count == priv->sgl_max) {
+		dev->trans_start = jiffies;
+		i2o_post_message(iop, priv->m);
+		dprintk(KERN_DEBUG "%s: %d packets sent.\n", dev->name, priv->tx_count);
+		priv->tx_count = 0;
+	}
+
+	/* If DDMs TxMaxPktOut reached, stop queueing layer to send more */
+
+	if (atomic_read(&priv->tx_out) >= priv->tx_max_out)
+		netif_stop_queue(dev);
+
+	spin_unlock_irq(&priv->tx_lock);
+	return 0;
+}
+
+/*
+ * i2o_lan_get_stats(): Fill in the statistics.
+ */
+static struct net_device_stats *i2o_lan_get_stats(struct net_device *dev)
+{
+	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
+	struct i2o_device *i2o_dev = priv->i2o_dev;
+	struct i2o_controller *iop = i2o_dev->controller;
+	u64 val64[16];
+	u64 supported_group[4] = { 0, 0, 0, 0 };
+
+	if (i2o_query_scalar(iop, i2o_dev->lct_data.tid, 0x0100, -1, val64,
+			     sizeof(val64)) < 0)
+		printk(KERN_INFO "%s: Unable to query LAN_HISTORICAL_STATS.\n", dev->name);
+	else {
+		dprintk(KERN_DEBUG "%s: LAN_HISTORICAL_STATS queried.\n", dev->name);
+		priv->stats.tx_packets = val64[0];
+		priv->stats.tx_bytes   = val64[1];
+		priv->stats.rx_packets = val64[2];
+		priv->stats.rx_bytes   = val64[3];
+		priv->stats.tx_errors  = val64[4];
+		priv->stats.rx_errors  = val64[5];
+		priv->stats.rx_dropped = val64[6];
+	}
+
+	if (i2o_query_scalar(iop, i2o_dev->lct_data.tid, 0x0180, -1,
+			     &supported_group, sizeof(supported_group)) < 0)
+		printk(KERN_INFO "%s: Unable to query LAN_SUPPORTED_OPTIONAL_HISTORICAL_STATS.\n", dev->name);
+
+	if (supported_group[2]) {
+		if (i2o_query_scalar(iop, i2o_dev->lct_data.tid, 0x0183, -1,
+				     val64, sizeof(val64)) < 0)
+			printk(KERN_INFO "%s: Unable to query LAN_OPTIONAL_RX_HISTORICAL_STATS.\n", dev->name);
+		else {
+			dprintk(KERN_DEBUG "%s: LAN_OPTIONAL_RX_HISTORICAL_STATS queried.\n", dev->name);
+			priv->stats.multicast	     = val64[4];
+			priv->stats.rx_length_errors = val64[10];
+			priv->stats.rx_crc_errors    = val64[0];
+		}
+	}
+
+	if (i2o_dev->lct_data.sub_class == I2O_LAN_ETHERNET) {
+		u64 supported_stats = 0;
+		if (i2o_query_scalar(iop, i2o_dev->lct_data.tid, 0x0200, -1,
+				     val64, sizeof(val64)) < 0)
+			printk(KERN_INFO "%s: Unable to query LAN_802_3_HISTORICAL_STATS.\n", dev->name);
+		else {
+			dprintk(KERN_DEBUG "%s: LAN_802_3_HISTORICAL_STATS queried.\n", dev->name);
+	 		priv->stats.transmit_collision = val64[1] + val64[2];
+			priv->stats.rx_frame_errors    = val64[0];
+			priv->stats.tx_carrier_errors  = val64[6];
+		}
+
+		if (i2o_query_scalar(iop, i2o_dev->lct_data.tid, 0x0280, -1,
+				     &supported_stats, sizeof(supported_stats)) < 0)
+			printk(KERN_INFO "%s: Unable to query LAN_SUPPORTED_802_3_HISTORICAL_STATS.\n", dev->name);
+
+		if (supported_stats != 0) {
+			if (i2o_query_scalar(iop, i2o_dev->lct_data.tid, 0x0281, -1,
+					     val64, sizeof(val64)) < 0)
+				printk(KERN_INFO "%s: Unable to query LAN_OPTIONAL_802_3_HISTORICAL_STATS.\n", dev->name);
+			else {
+				dprintk(KERN_DEBUG "%s: LAN_OPTIONAL_802_3_HISTORICAL_STATS queried.\n", dev->name);
+				if (supported_stats & 0x1)
+					priv->stats.rx_over_errors = val64[0];
+				if (supported_stats & 0x4)
+					priv->stats.tx_heartbeat_errors = val64[2];
+			}
+		}
+	}
+
+#ifdef CONFIG_TR
+	if (i2o_dev->lct_data.sub_class == I2O_LAN_TR) {
+		if (i2o_query_scalar(iop, i2o_dev->lct_data.tid, 0x0300, -1,
+				     val64, sizeof(val64)) < 0)
+			printk(KERN_INFO "%s: Unable to query LAN_802_5_HISTORICAL_STATS.\n", dev->name);
+		else {
+			struct tr_statistics *stats =
+				(struct tr_statistics *)&priv->stats;
+			dprintk(KERN_DEBUG "%s: LAN_802_5_HISTORICAL_STATS queried.\n", dev->name);
+
+			stats->line_errors		= val64[0];
+			stats->internal_errors		= val64[7];
+			stats->burst_errors		= val64[4];
+			stats->A_C_errors		= val64[2];
+			stats->abort_delimiters		= val64[3];
+			stats->lost_frames		= val64[1];
+			/* stats->recv_congest_count	= ?;  FIXME ??*/
+			stats->frame_copied_errors	= val64[5];
+			stats->frequency_errors		= val64[6];
+			stats->token_errors		= val64[9];
+		}
+		/* Token Ring optional stats not yet defined */
+	}
+#endif
+
+#ifdef CONFIG_FDDI
+	if (i2o_dev->lct_data.sub_class == I2O_LAN_FDDI) {
+		if (i2o_query_scalar(iop, i2o_dev->lct_data.tid, 0x0400, -1,
+				     val64, sizeof(val64)) < 0)
+			printk(KERN_INFO "%s: Unable to query LAN_FDDI_HISTORICAL_STATS.\n", dev->name);
+		else {
+			dprintk(KERN_DEBUG "%s: LAN_FDDI_HISTORICAL_STATS queried.\n", dev->name);
+			priv->stats.smt_cf_state = val64[0];
+			memcpy(priv->stats.mac_upstream_nbr, &val64[1], FDDI_K_ALEN);
+			memcpy(priv->stats.mac_downstream_nbr, &val64[2], FDDI_K_ALEN);
+			priv->stats.mac_error_cts = val64[3];
+			priv->stats.mac_lost_cts  = val64[4];
+			priv->stats.mac_rmt_state = val64[5];
+			memcpy(priv->stats.port_lct_fail_cts, &val64[6], 8);
+			memcpy(priv->stats.port_lem_reject_cts, &val64[7], 8);
+			memcpy(priv->stats.port_lem_cts, &val64[8], 8);
+			memcpy(priv->stats.port_pcm_state, &val64[9], 8);
+		}
+		/* FDDI optional stats not yet defined */
+	}
+#endif
+
+#ifdef CONFIG_NET_FC
+	/* Fibre Channel Statistics not yet defined in 1.53 nor 2.0 */
+#endif
+
+	return (struct net_device_stats *)&priv->stats;
+}
+
+/* 
+ * i2o_lan_set_mc_filter(): Post a request to set multicast filter.
+ */
+int i2o_lan_set_mc_filter(struct net_device *dev, u32 filter_mask)
+{
+	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;	
+	struct i2o_device *i2o_dev = priv->i2o_dev;
+	struct i2o_controller *iop = i2o_dev->controller;
+	u32 msg[10]; 
+
+	msg[0] = TEN_WORD_MSG_SIZE | SGL_OFFSET_5;
+	msg[1] = I2O_CMD_UTIL_PARAMS_SET << 24 | HOST_TID << 12 | i2o_dev->lct_data.tid;
+	msg[2] = priv->unit << 16 | lan_context;
+	msg[3] = 0x0001 << 16 | 3 ;	// TransactionContext: group&field
+	msg[4] = 0;
+	msg[5] = 0xCC000000 | 16; 			// Immediate data SGL
+	msg[6] = 1;					// OperationCount
+	msg[7] = 0x0001<<16 | I2O_PARAMS_FIELD_SET;	// Group, Operation
+	msg[8] = 3 << 16 | 1; 				// FieldIndex, FieldCount 
+	msg[9] = filter_mask;				// Value
+
+	return i2o_post_this(iop, msg, sizeof(msg));
+}
+
+/* 
+ * i2o_lan_set_mc_table(): Post a request to set LAN_MULTICAST_MAC_ADDRESS table.
+ */
+int i2o_lan_set_mc_table(struct net_device *dev)
+{
+	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;	
+	struct i2o_device *i2o_dev = priv->i2o_dev;
+	struct i2o_controller *iop = i2o_dev->controller;
+	struct dev_mc_list *mc;
+	u32 msg[10 + 2 * dev->mc_count]; 
+	u8 *work8 = (u8 *)(msg + 10);
+
+	msg[0] = I2O_MESSAGE_SIZE(10 + 2 * dev->mc_count) | SGL_OFFSET_5;
+	msg[1] = I2O_CMD_UTIL_PARAMS_SET << 24 | HOST_TID << 12 | i2o_dev->lct_data.tid;
+	msg[2] = priv->unit << 16 | lan_context;	// InitiatorContext
+	msg[3] = 0x0002 << 16 | (u16)-1;		// TransactionContext
+	msg[4] = 0;					// OperationFlags
+	msg[5] = 0xCC000000 | (16 + 8 * dev->mc_count);	// Immediate data SGL
+	msg[6] = 2;					// OperationCount
+	msg[7] = 0x0002 << 16 | I2O_PARAMS_TABLE_CLEAR;	// Group, Operation
+	msg[8] = 0x0002 << 16 | I2O_PARAMS_ROW_ADD;     // Group, Operation
+	msg[9] = dev->mc_count << 16 | (u16)-1; 	// RowCount, FieldCount
+
+        for (mc = dev->mc_list; mc ; mc = mc->next, work8 += 8) {
+		  memset(work8, 0, 8);
+                  memcpy(work8, mc->dmi_addr, mc->dmi_addrlen); // Values
+	}
+
+	return i2o_post_this(iop, msg, sizeof(msg));
+}
+
+/*
+ * i2o_lan_set_multicast_list(): Enable a network device to receive packets
+ *      not send to the protocol address.
+ */
+static void i2o_lan_set_multicast_list(struct net_device *dev)
+{
+	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
+	u32 filter_mask;
+
+	if (dev->flags & IFF_PROMISC) {
+		filter_mask = 0x00000002;
+		dprintk(KERN_INFO "%s: Enabling promiscuous mode...\n", dev->name);
+	} else if ((dev->flags & IFF_ALLMULTI) || dev->mc_count > priv->max_size_mc_table) {
+		filter_mask = 0x00000004;
+		dprintk(KERN_INFO "%s: Enabling all multicast mode...\n", dev->name);
+	} else if (dev->mc_count) {
+		filter_mask = 0x00000000;
+		dprintk(KERN_INFO "%s: Enabling multicast mode...\n", dev->name);
+		if (i2o_lan_set_mc_table(dev) < 0)
+			printk(KERN_WARNING "%s: Unable to send MAC table.\n", dev->name);
+	} else {
+		filter_mask = 0x00000300; // Broadcast, Multicast disabled
+		dprintk(KERN_INFO "%s: Enabling unicast mode...\n", dev->name);
+	}
+
+	/* Finally copy new FilterMask to DDM */
+
+	if (i2o_lan_set_mc_filter(dev, filter_mask) < 0)
+		printk(KERN_WARNING "%s: Unable to send MAC FilterMask.\n", dev->name);
+}
+
+/*
+ * i2o_lan_change_mtu(): Change maximum transfer unit size.
+ */
+static int i2o_lan_change_mtu(struct net_device *dev, int new_mtu)
+{
+	struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
+	struct i2o_device *i2o_dev = priv->i2o_dev;
+	u32 max_pkt_size;
+
+	if (i2o_query_scalar(i2o_dev->controller, i2o_dev->lct_data.tid,
+		 	     0x0000, 6, &max_pkt_size, 4) < 0)
+		return -EFAULT;
+
+	if (new_mtu < 68 || new_mtu > 9000 || new_mtu > max_pkt_size)
+		return -EINVAL;
+
+	dev->mtu = new_mtu;
+
+	i2o_lan_suspend(dev);   	// to SUSPENDED state, return buckets
+
+	while (priv->i2o_fbl_tail >= 0) // free buffered buckets
+		dev_kfree_skb(priv->i2o_fbl[priv->i2o_fbl_tail--]);
+
+	i2o_lan_reset(dev);		// to OPERATIONAL state
+	i2o_set_ddm_parameters(dev); 	// reset some parameters
+	i2o_lan_receive_post(dev); 	// post new buckets (new size)
+
+	return 0;
+}
+
+/* Functions to initialize I2O LAN OSM:
+======================================*/
+
+/*
+ * i2o_lan_register_device(): Register LAN class device to kernel.
+ */
+struct net_device *i2o_lan_register_device(struct i2o_device *i2o_dev)
+{
+	struct net_device *dev = NULL;
+	struct i2o_lan_local *priv = NULL;
+	u8 hw_addr[8];
+	u32 tx_max_out = 0;
+	unsigned short (*type_trans)(struct sk_buff *, struct net_device *);
+	void (*unregister_dev)(struct net_device *dev);
+
+	switch (i2o_dev->lct_data.sub_class) {
+	case I2O_LAN_ETHERNET:
+		dev = init_etherdev(NULL, sizeof(struct i2o_lan_local));
+		if (dev == NULL)
+			return NULL;
+		type_trans = eth_type_trans;
+		unregister_dev = unregister_netdev;
+		break;
+
+#ifdef CONFIG_ANYLAN
+	case I2O_LAN_100VG:
+		printk(KERN_ERR "i2o_lan: 100base VG not yet supported.\n");
+		return NULL;
+		break;
+#endif
+
+#ifdef CONFIG_TR
+	case I2O_LAN_TR:
+		dev = init_trdev(NULL, sizeof(struct i2o_lan_local));
+		if (dev==NULL)
+			return NULL;
+		type_trans = tr_type_trans;
+		unregister_dev = unregister_trdev;
+		break;
+#endif
+
+#ifdef CONFIG_FDDI
+	case I2O_LAN_FDDI:
+	{
+		int size = sizeof(struct net_device) + sizeof(struct i2o_lan_local);
+
+		dev = (struct net_device *) kmalloc(size, GFP_KERNEL);
+		if (dev == NULL)
+			return NULL;
+		memset((char *)dev, 0, size);
+	    	dev->priv = (void *)(dev + 1);
+
+		if (dev_alloc_name(dev, "fddi%d") < 0) {
+			printk(KERN_WARNING "i2o_lan: Too many FDDI devices.\n");
+			kfree(dev);
+			return NULL;
+		}
+		type_trans = fddi_type_trans;
+		unregister_dev = (void *)unregister_netdevice;
+
+		fddi_setup(dev);
+		register_netdev(dev);
+	}
+	break;
+#endif
+
+#ifdef CONFIG_NET_FC
+	case I2O_LAN_FIBRE_CHANNEL:
+		dev = init_fcdev(NULL, sizeof(struct i2o_lan_local));
+		if (dev == NULL)
+			return NULL;
+		type_trans = NULL;
+/* FIXME: Move fc_type_trans() from drivers/net/fc/iph5526.c to net/802/fc.c
+ * and export it in include/linux/fcdevice.h
+ *		type_trans = fc_type_trans;
+ */
+		unregister_dev = (void *)unregister_fcdev;
+		break;
+#endif
+
+	case I2O_LAN_UNKNOWN:
+	default:
+		printk(KERN_ERR "i2o_lan: LAN type 0x%04x not supported.\n",
+		       i2o_dev->lct_data.sub_class);
+		return NULL;
+	}
+
+	priv = (struct i2o_lan_local *)dev->priv;
+	priv->i2o_dev = i2o_dev;
+	priv->type_trans = type_trans;
+	priv->sgl_max = (i2o_dev->controller->status_block->inbound_frame_size - 4) / 3;
+	atomic_set(&priv->buckets_out, 0);
+
+	/* Set default values for user configurable parameters */
+	/* Private values are changed via /proc file system */
+
+	priv->max_buckets_out = max_buckets_out;
+	priv->bucket_thresh   = bucket_thresh;
+	priv->rx_copybreak    = rx_copybreak;
+	priv->tx_batch_mode   = tx_batch_mode & 0x03;
+	priv->i2o_event_mask  = i2o_event_mask;
+
+	priv->tx_lock	      = SPIN_LOCK_UNLOCKED;
+	priv->fbl_lock	      = SPIN_LOCK_UNLOCKED;
+
+	unit++;
+	i2o_landevs[unit] = dev;
+	priv->unit = unit;
+
+	if (i2o_query_scalar(i2o_dev->controller, i2o_dev->lct_data.tid,
+			     0x0001, 0, &hw_addr, sizeof(hw_addr)) < 0) {
+		printk(KERN_ERR "%s: Unable to query hardware address.\n", dev->name);
+		unit--;
+		unregister_dev(dev);
+		kfree(dev);
+		return NULL;
+	}
+	dprintk(KERN_DEBUG "%s: hwaddr = %02X:%02X:%02X:%02X:%02X:%02X\n",
+ 		dev->name, hw_addr[0], hw_addr[1], hw_addr[2], hw_addr[3],
+		hw_addr[4], hw_addr[5]);
+
+	dev->addr_len = 6;
+	memcpy(dev->dev_addr, hw_addr, 6);
+
+	if (i2o_query_scalar(i2o_dev->controller, i2o_dev->lct_data.tid,
+			     0x0007, 2, &tx_max_out, sizeof(tx_max_out)) < 0) {
+		printk(KERN_ERR "%s: Unable to query max TX queue.\n", dev->name);
+		unit--;
+		unregister_dev(dev);
+		kfree(dev);
+		return NULL;
+	}
+	dprintk(KERN_INFO "%s: Max TX Outstanding = %d.\n", dev->name, tx_max_out);
+	priv->tx_max_out = tx_max_out;
+	atomic_set(&priv->tx_out, 0);
+	priv->tx_count = 0;
+
+	INIT_LIST_HEAD(&priv->i2o_batch_send_task.list);
+	priv->i2o_batch_send_task.sync    = 0;
+	priv->i2o_batch_send_task.routine = (void *)i2o_lan_batch_send;
+	priv->i2o_batch_send_task.data    = (void *)dev;
+
+	dev->open		= i2o_lan_open;
+	dev->stop		= i2o_lan_close;
+	dev->get_stats		= i2o_lan_get_stats;
+	dev->set_multicast_list = i2o_lan_set_multicast_list;
+	dev->tx_timeout		= i2o_lan_tx_timeout;
+	dev->watchdog_timeo	= I2O_LAN_TX_TIMEOUT;
+
+#ifdef CONFIG_NET_FC
+	if (i2o_dev->lct_data.sub_class == I2O_LAN_FIBRE_CHANNEL)
+		dev->hard_start_xmit = i2o_lan_sdu_send;
+	else
+#endif
+		dev->hard_start_xmit = i2o_lan_packet_send;
+
+	if (i2o_dev->lct_data.sub_class == I2O_LAN_ETHERNET)
+		dev->change_mtu	= i2o_lan_change_mtu;
+
+	return dev;
+}
+
+#ifdef MODULE
+#define i2o_lan_init	init_module
+#endif
+
+int __init i2o_lan_init(void)
+{
+	struct net_device *dev;
+	int i;
+
+	printk(KERN_INFO "I2O LAN OSM (C) 1999 University of Helsinki.\n");
+
+	/* Module params are used as global defaults for private values */
+
+	if (max_buckets_out > I2O_LAN_MAX_BUCKETS_OUT)
+		max_buckets_out = I2O_LAN_MAX_BUCKETS_OUT;
+	if (bucket_thresh > max_buckets_out)
+		bucket_thresh = max_buckets_out;
+
+	/* Install handlers for incoming replies */
+
+	if (i2o_install_handler(&i2o_lan_send_handler) < 0) {
+ 		printk(KERN_ERR "i2o_lan: Unable to register I2O LAN OSM.\n");
+		return -EINVAL;
+	}
+	lan_send_context = i2o_lan_send_handler.context;
+
+	if (i2o_install_handler(&i2o_lan_receive_handler) < 0) {
+ 		printk(KERN_ERR "i2o_lan: Unable to register I2O LAN OSM.\n");
+		return -EINVAL;
+	}
+	lan_receive_context = i2o_lan_receive_handler.context;
+
+	if (i2o_install_handler(&i2o_lan_handler) < 0) {
+ 		printk(KERN_ERR "i2o_lan: Unable to register I2O LAN OSM.\n");
+		return -EINVAL;
+	}
+	lan_context = i2o_lan_handler.context;
+
+	for(i=0; i <= MAX_LAN_CARDS; i++)
+		i2o_landevs[i] = NULL;
+
+	for (i=0; i < MAX_I2O_CONTROLLERS; i++) {
+		struct i2o_controller *iop = i2o_find_controller(i);
+		struct i2o_device *i2o_dev;
+
+		if (iop==NULL)
+			continue;
+
+		for (i2o_dev=iop->devices;i2o_dev != NULL;i2o_dev=i2o_dev->next) {
+
+			if (i2o_dev->lct_data.class_id != I2O_CLASS_LAN)
+				continue;
+
+			/* Make sure device not already claimed by an ISM */
+			if (i2o_dev->lct_data.user_tid != 0xFFF)
+				continue;
+
+			if (unit == MAX_LAN_CARDS) {
+				i2o_unlock_controller(iop);
+				printk(KERN_WARNING "i2o_lan: Too many I2O LAN devices.\n");
+				return -EINVAL;
+			}
+
+			dev = i2o_lan_register_device(i2o_dev);
+ 			if (dev == NULL) {
+				printk(KERN_ERR "i2o_lan: Unable to register I2O LAN device 0x%04x.\n",
+				       i2o_dev->lct_data.sub_class);
+				continue;
+			}
+
+			printk(KERN_INFO "%s: I2O LAN device registered, "
+				"subclass = 0x%04x, unit = %d, tid = %d.\n",
+				dev->name, i2o_dev->lct_data.sub_class,
+				((struct i2o_lan_local *)dev->priv)->unit,
+				i2o_dev->lct_data.tid);
+		}
+
+		i2o_unlock_controller(iop);
+	}
+
+	dprintk(KERN_INFO "%d I2O LAN devices found and registered.\n", unit+1);
+
+	return 0;
+}
+
+#ifdef MODULE
+
+void cleanup_module(void)
+{
+	int i;
+
+	for (i = 0; i <= unit; i++) {
+		struct net_device *dev = i2o_landevs[i];
+		struct i2o_lan_local *priv = (struct i2o_lan_local *)dev->priv;
+		struct i2o_device *i2o_dev = priv->i2o_dev;
+
+		switch (i2o_dev->lct_data.sub_class) {
+		case I2O_LAN_ETHERNET:
+			unregister_netdev(dev);
+			break;
+#ifdef CONFIG_FDDI
+		case I2O_LAN_FDDI:
+			unregister_netdevice(dev);
+			break;
+#endif
+#ifdef CONFIG_TR
+		case I2O_LAN_TR:
+			unregister_trdev(dev);
+			break;
+#endif
+#ifdef CONFIG_NET_FC
+		case I2O_LAN_FIBRE_CHANNEL:
+			unregister_fcdev(dev);
+			break;
+#endif
+		default:
+			printk(KERN_WARNING "%s: Spurious I2O LAN subclass 0x%08x.\n",
+			       dev->name, i2o_dev->lct_data.sub_class);
+		}
+
+		dprintk(KERN_INFO "%s: I2O LAN device unregistered.\n",
+			dev->name);
+		kfree(dev);
+	}
+
+	i2o_remove_handler(&i2o_lan_handler);
+	i2o_remove_handler(&i2o_lan_send_handler);
+	i2o_remove_handler(&i2o_lan_receive_handler);
+}
+
+EXPORT_NO_SYMBOLS;
+
+MODULE_AUTHOR("University of Helsinki, Department of Computer Science");
+MODULE_DESCRIPTION("I2O Lan OSM");
+MODULE_LICENSE("GPL");
+
+
+MODULE_PARM(max_buckets_out, "1-" __MODULE_STRING(I2O_LAN_MAX_BUCKETS_OUT) "i");
+MODULE_PARM_DESC(max_buckets_out, "Total number of buckets to post (1-)");
+MODULE_PARM(bucket_thresh, "1-" __MODULE_STRING(I2O_LAN_MAX_BUCKETS_OUT) "i");
+MODULE_PARM_DESC(bucket_thresh, "Bucket post threshold (1-)");
+MODULE_PARM(rx_copybreak, "1-" "i");
+MODULE_PARM_DESC(rx_copybreak, "Copy breakpoint for copy only small frames (1-)");
+MODULE_PARM(tx_batch_mode, "0-2" "i");
+MODULE_PARM_DESC(tx_batch_mode, "0=Send immediatelly, 1=Send in batches, 2=Switch automatically");
+
+#endif

FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)