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, 1175 insertions, 0 deletions

diff --git a/drivers/net/ibmveth.c b/drivers/net/ibmveth.c
new file mode 100644
index 0000000..c39b060
--- /dev/null
+++ b/drivers/net/ibmveth.c
@@ -0,0 +1,1175 @@
+/**************************************************************************/
+/*                                                                        */
+/* IBM eServer i/pSeries Virtual Ethernet Device Driver                   */
+/* Copyright (C) 2003 IBM Corp.                                           */
+/*  Originally written by Dave Larson (larson1@us.ibm.com)                */
+/*  Maintained by Santiago Leon (santil@us.ibm.com)                       */
+/*                                                                        */
+/*  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 contains the implementation of a virtual ethernet device   */
+/* for use with IBM i/pSeries LPAR Linux.  It utilizes the logical LAN    */
+/* option of the RS/6000 Platform Architechture to interface with virtual */
+/* ethernet NICs that are presented to the partition by the hypervisor.   */
+/*                                                                        */ 
+/**************************************************************************/
+/*
+  TODO:
+  - remove frag processing code - no longer needed
+  - add support for sysfs
+  - possibly remove procfs support
+*/
+
+#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/dma-mapping.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 <linux/proc_fs.h>
+#include <asm/semaphore.h>
+#include <asm/hvcall.h>
+#include <asm/atomic.h>
+#include <asm/iommu.h>
+#include <asm/vio.h>
+#include <asm/uaccess.h>
+#include <linux/seq_file.h>
+
+#include "ibmveth.h"
+
+#define DEBUG 1
+
+#define ibmveth_printk(fmt, args...) \
+  printk(KERN_INFO "%s: " fmt, __FILE__, ## args)
+
+#define ibmveth_error_printk(fmt, args...) \
+  printk(KERN_ERR "(%s:%3.3d ua:%x) ERROR: " fmt, __FILE__, __LINE__ , adapter->vdev->unit_address, ## args)
+
+#ifdef DEBUG
+#define ibmveth_debug_printk_no_adapter(fmt, args...) \
+  printk(KERN_DEBUG "(%s:%3.3d): " fmt, __FILE__, __LINE__ , ## args)
+#define ibmveth_debug_printk(fmt, args...) \
+  printk(KERN_DEBUG "(%s:%3.3d ua:%x): " fmt, __FILE__, __LINE__ , adapter->vdev->unit_address, ## args)
+#define ibmveth_assert(expr) \
+  if(!(expr)) {                                   \
+    printk(KERN_DEBUG "assertion failed (%s:%3.3d ua:%x): %s\n", __FILE__, __LINE__, adapter->vdev->unit_address, #expr); \
+    BUG(); \
+  }
+#else
+#define ibmveth_debug_printk_no_adapter(fmt, args...)
+#define ibmveth_debug_printk(fmt, args...)
+#define ibmveth_assert(expr) 
+#endif
+
+static int ibmveth_open(struct net_device *dev);
+static int ibmveth_close(struct net_device *dev);
+static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
+static int ibmveth_poll(struct net_device *dev, int *budget);
+static int ibmveth_start_xmit(struct sk_buff *skb, struct net_device *dev);
+static struct net_device_stats *ibmveth_get_stats(struct net_device *dev);
+static void ibmveth_set_multicast_list(struct net_device *dev);
+static int ibmveth_change_mtu(struct net_device *dev, int new_mtu);
+static void ibmveth_proc_register_driver(void);
+static void ibmveth_proc_unregister_driver(void);
+static void ibmveth_proc_register_adapter(struct ibmveth_adapter *adapter);
+static void ibmveth_proc_unregister_adapter(struct ibmveth_adapter *adapter);
+static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance, struct pt_regs *regs);
+static inline void ibmveth_schedule_replenishing(struct ibmveth_adapter*);
+
+#ifdef CONFIG_PROC_FS
+#define IBMVETH_PROC_DIR "ibmveth"
+static struct proc_dir_entry *ibmveth_proc_dir;
+#endif
+
+static const char ibmveth_driver_name[] = "ibmveth";
+static const char ibmveth_driver_string[] = "IBM i/pSeries Virtual Ethernet Driver";
+#define ibmveth_driver_version "1.03"
+
+MODULE_AUTHOR("Santiago Leon <santil@us.ibm.com>");
+MODULE_DESCRIPTION("IBM i/pSeries Virtual Ethernet Driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(ibmveth_driver_version);
+
+/* simple methods of getting data from the current rxq entry */
+static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
+{
+	return (adapter->rx_queue.queue_addr[adapter->rx_queue.index].toggle == adapter->rx_queue.toggle);
+}
+
+static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
+{
+	return (adapter->rx_queue.queue_addr[adapter->rx_queue.index].valid);
+}
+
+static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
+{
+	return (adapter->rx_queue.queue_addr[adapter->rx_queue.index].offset);
+}
+
+static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
+{
+	return (adapter->rx_queue.queue_addr[adapter->rx_queue.index].length);
+}
+
+/* setup the initial settings for a buffer pool */
+static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool, u32 pool_index, u32 pool_size, u32 buff_size)
+{
+	pool->size = pool_size;
+	pool->index = pool_index;
+	pool->buff_size = buff_size;
+	pool->threshold = pool_size / 2;
+}
+
+/* allocate and setup an buffer pool - called during open */
+static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
+{
+	int i;
+
+	pool->free_map = kmalloc(sizeof(u16) * pool->size, GFP_KERNEL); 
+
+	if(!pool->free_map) {
+		return -1;
+	}
+
+	pool->dma_addr = kmalloc(sizeof(dma_addr_t) * pool->size, GFP_KERNEL); 
+	if(!pool->dma_addr) {
+		kfree(pool->free_map);
+		pool->free_map = NULL;
+		return -1;
+	}
+
+	pool->skbuff = kmalloc(sizeof(void*) * pool->size, GFP_KERNEL);
+
+	if(!pool->skbuff) {
+		kfree(pool->dma_addr);
+		pool->dma_addr = NULL;
+
+		kfree(pool->free_map);
+		pool->free_map = NULL;
+		return -1;
+	}
+
+	memset(pool->skbuff, 0, sizeof(void*) * pool->size);
+	memset(pool->dma_addr, 0, sizeof(dma_addr_t) * pool->size);
+
+	for(i = 0; i < pool->size; ++i) {
+		pool->free_map[i] = i;
+	}
+
+	atomic_set(&pool->available, 0);
+	pool->producer_index = 0;
+	pool->consumer_index = 0;
+
+	return 0;
+}
+
+/* replenish the buffers for a pool.  note that we don't need to
+ * skb_reserve these since they are used for incoming...
+ */
+static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter, struct ibmveth_buff_pool *pool)
+{
+	u32 i;
+	u32 count = pool->size - atomic_read(&pool->available);
+	u32 buffers_added = 0;
+
+	mb();
+
+	for(i = 0; i < count; ++i) {
+		struct sk_buff *skb;
+		unsigned int free_index, index;
+		u64 correlator;
+		union ibmveth_buf_desc desc;
+		unsigned long lpar_rc;
+		dma_addr_t dma_addr;
+
+		skb = alloc_skb(pool->buff_size, GFP_ATOMIC);
+
+		if(!skb) {
+			ibmveth_debug_printk("replenish: unable to allocate skb\n");
+			adapter->replenish_no_mem++;
+			break;
+		}
+
+		free_index = pool->consumer_index++ % pool->size;
+		index = pool->free_map[free_index];
+	
+		ibmveth_assert(index != IBM_VETH_INVALID_MAP);
+		ibmveth_assert(pool->skbuff[index] == NULL);
+
+		dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
+				pool->buff_size, DMA_FROM_DEVICE);
+
+		pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
+		pool->dma_addr[index] = dma_addr;
+		pool->skbuff[index] = skb;
+
+		correlator = ((u64)pool->index << 32) | index;
+		*(u64*)skb->data = correlator;
+
+		desc.desc = 0;
+		desc.fields.valid = 1;
+		desc.fields.length = pool->buff_size;
+		desc.fields.address = dma_addr; 
+
+		lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
+		    
+		if(lpar_rc != H_Success) {
+			pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
+			pool->skbuff[index] = NULL;
+			pool->consumer_index--;
+			dma_unmap_single(&adapter->vdev->dev,
+					pool->dma_addr[index], pool->buff_size,
+					DMA_FROM_DEVICE);
+			dev_kfree_skb_any(skb);
+			adapter->replenish_add_buff_failure++;
+			break;
+		} else {
+			buffers_added++;
+			adapter->replenish_add_buff_success++;
+		}
+	}
+    
+	mb();
+	atomic_add(buffers_added, &(pool->available));
+}
+
+/* check if replenishing is needed.  */
+static inline int ibmveth_is_replenishing_needed(struct ibmveth_adapter *adapter)
+{
+	return ((atomic_read(&adapter->rx_buff_pool[0].available) < adapter->rx_buff_pool[0].threshold) ||
+		(atomic_read(&adapter->rx_buff_pool[1].available) < adapter->rx_buff_pool[1].threshold) ||
+		(atomic_read(&adapter->rx_buff_pool[2].available) < adapter->rx_buff_pool[2].threshold));
+}
+
+/* kick the replenish tasklet if we need replenishing and it isn't already running */
+static inline void ibmveth_schedule_replenishing(struct ibmveth_adapter *adapter)
+{
+	if(ibmveth_is_replenishing_needed(adapter) &&
+	   (atomic_dec_if_positive(&adapter->not_replenishing) == 0)) {
+		schedule_work(&adapter->replenish_task);
+	}
+}
+
+/* replenish tasklet routine */
+static void ibmveth_replenish_task(struct ibmveth_adapter *adapter) 
+{
+	adapter->replenish_task_cycles++;
+
+	ibmveth_replenish_buffer_pool(adapter, &adapter->rx_buff_pool[0]);
+	ibmveth_replenish_buffer_pool(adapter, &adapter->rx_buff_pool[1]);
+	ibmveth_replenish_buffer_pool(adapter, &adapter->rx_buff_pool[2]);
+
+	adapter->rx_no_buffer = *(u64*)(((char*)adapter->buffer_list_addr) + 4096 - 8);
+
+	atomic_inc(&adapter->not_replenishing);
+
+	ibmveth_schedule_replenishing(adapter);
+}
+
+/* empty and free ana buffer pool - also used to do cleanup in error paths */
+static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter, struct ibmveth_buff_pool *pool)
+{
+	int i;
+
+	if(pool->free_map) {
+		kfree(pool->free_map);
+		pool->free_map  = NULL;
+	}
+
+	if(pool->skbuff && pool->dma_addr) {
+		for(i = 0; i < pool->size; ++i) {
+			struct sk_buff *skb = pool->skbuff[i];
+			if(skb) {
+				dma_unmap_single(&adapter->vdev->dev,
+						 pool->dma_addr[i],
+						 pool->buff_size,
+						 DMA_FROM_DEVICE);
+				dev_kfree_skb_any(skb);
+				pool->skbuff[i] = NULL;
+			}
+		}
+	}
+
+	if(pool->dma_addr) {
+		kfree(pool->dma_addr);
+		pool->dma_addr = NULL;
+	}
+
+	if(pool->skbuff) {
+		kfree(pool->skbuff);
+		pool->skbuff = NULL;
+	}
+}
+
+/* remove a buffer from a pool */
+static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter, u64 correlator)
+{
+	unsigned int pool  = correlator >> 32;
+	unsigned int index = correlator & 0xffffffffUL;
+	unsigned int free_index;
+	struct sk_buff *skb;
+
+	ibmveth_assert(pool < IbmVethNumBufferPools);
+	ibmveth_assert(index < adapter->rx_buff_pool[pool].size);
+
+	skb = adapter->rx_buff_pool[pool].skbuff[index];
+
+	ibmveth_assert(skb != NULL);
+
+	adapter->rx_buff_pool[pool].skbuff[index] = NULL;
+
+	dma_unmap_single(&adapter->vdev->dev,
+			 adapter->rx_buff_pool[pool].dma_addr[index],
+			 adapter->rx_buff_pool[pool].buff_size,
+			 DMA_FROM_DEVICE);
+
+	free_index = adapter->rx_buff_pool[pool].producer_index++ % adapter->rx_buff_pool[pool].size;
+	adapter->rx_buff_pool[pool].free_map[free_index] = index;
+
+	mb();
+
+	atomic_dec(&(adapter->rx_buff_pool[pool].available));
+}
+
+/* get the current buffer on the rx queue */
+static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
+{
+	u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
+	unsigned int pool = correlator >> 32;
+	unsigned int index = correlator & 0xffffffffUL;
+
+	ibmveth_assert(pool < IbmVethNumBufferPools);
+	ibmveth_assert(index < adapter->rx_buff_pool[pool].size);
+
+	return adapter->rx_buff_pool[pool].skbuff[index];
+}
+
+/* recycle the current buffer on the rx queue */
+static void ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
+{
+	u32 q_index = adapter->rx_queue.index;
+	u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
+	unsigned int pool = correlator >> 32;
+	unsigned int index = correlator & 0xffffffffUL;
+	union ibmveth_buf_desc desc;
+	unsigned long lpar_rc;
+
+	ibmveth_assert(pool < IbmVethNumBufferPools);
+	ibmveth_assert(index < adapter->rx_buff_pool[pool].size);
+
+	desc.desc = 0;
+	desc.fields.valid = 1;
+	desc.fields.length = adapter->rx_buff_pool[pool].buff_size;
+	desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
+
+	lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
+		    
+	if(lpar_rc != H_Success) {
+		ibmveth_debug_printk("h_add_logical_lan_buffer failed during recycle rc=%ld", lpar_rc);
+		ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
+	}
+
+	if(++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
+		adapter->rx_queue.index = 0;
+		adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
+	}
+}
+
+static inline void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
+{
+	ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
+
+	if(++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
+		adapter->rx_queue.index = 0;
+		adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
+	}
+}
+
+static void ibmveth_cleanup(struct ibmveth_adapter *adapter)
+{
+	if(adapter->buffer_list_addr != NULL) {
+		if(!dma_mapping_error(adapter->buffer_list_dma)) {
+			dma_unmap_single(&adapter->vdev->dev,
+					adapter->buffer_list_dma, 4096,
+					DMA_BIDIRECTIONAL);
+			adapter->buffer_list_dma = DMA_ERROR_CODE;
+		}
+		free_page((unsigned long)adapter->buffer_list_addr);
+		adapter->buffer_list_addr = NULL;
+	} 
+
+	if(adapter->filter_list_addr != NULL) {
+		if(!dma_mapping_error(adapter->filter_list_dma)) {
+			dma_unmap_single(&adapter->vdev->dev,
+					adapter->filter_list_dma, 4096,
+					DMA_BIDIRECTIONAL);
+			adapter->filter_list_dma = DMA_ERROR_CODE;
+		}
+		free_page((unsigned long)adapter->filter_list_addr);
+		adapter->filter_list_addr = NULL;
+	}
+
+	if(adapter->rx_queue.queue_addr != NULL) {
+		if(!dma_mapping_error(adapter->rx_queue.queue_dma)) {
+			dma_unmap_single(&adapter->vdev->dev,
+					adapter->rx_queue.queue_dma,
+					adapter->rx_queue.queue_len,
+					DMA_BIDIRECTIONAL);
+			adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
+		}
+		kfree(adapter->rx_queue.queue_addr);
+		adapter->rx_queue.queue_addr = NULL;
+	}
+
+	ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[0]);
+	ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[1]);
+	ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[2]);
+}
+
+static int ibmveth_open(struct net_device *netdev)
+{
+	struct ibmveth_adapter *adapter = netdev->priv;
+	u64 mac_address = 0;
+	int rxq_entries;
+	unsigned long lpar_rc;
+	int rc;
+	union ibmveth_buf_desc rxq_desc;
+
+	ibmveth_debug_printk("open starting\n");
+
+	rxq_entries =
+		adapter->rx_buff_pool[0].size +
+		adapter->rx_buff_pool[1].size +
+		adapter->rx_buff_pool[2].size + 1;
+    
+	adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
+	adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
+ 
+	if(!adapter->buffer_list_addr || !adapter->filter_list_addr) {
+		ibmveth_error_printk("unable to allocate filter or buffer list pages\n");
+		ibmveth_cleanup(adapter);
+		return -ENOMEM;
+	}
+
+	adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) * rxq_entries;
+	adapter->rx_queue.queue_addr = kmalloc(adapter->rx_queue.queue_len, GFP_KERNEL);
+
+	if(!adapter->rx_queue.queue_addr) {
+		ibmveth_error_printk("unable to allocate rx queue pages\n");
+		ibmveth_cleanup(adapter);
+		return -ENOMEM;
+	}
+
+	adapter->buffer_list_dma = dma_map_single(&adapter->vdev->dev,
+			adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
+	adapter->filter_list_dma = dma_map_single(&adapter->vdev->dev,
+			adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
+	adapter->rx_queue.queue_dma = dma_map_single(&adapter->vdev->dev,
+			adapter->rx_queue.queue_addr,
+			adapter->rx_queue.queue_len, DMA_BIDIRECTIONAL);
+
+	if((dma_mapping_error(adapter->buffer_list_dma) ) ||
+	   (dma_mapping_error(adapter->filter_list_dma)) ||
+	   (dma_mapping_error(adapter->rx_queue.queue_dma))) {
+		ibmveth_error_printk("unable to map filter or buffer list pages\n");
+		ibmveth_cleanup(adapter);
+		return -ENOMEM;
+	}
+
+	adapter->rx_queue.index = 0;
+	adapter->rx_queue.num_slots = rxq_entries;
+	adapter->rx_queue.toggle = 1;
+
+	if(ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[0]) ||
+	   ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[1]) ||
+	   ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[2]))
+	{
+		ibmveth_error_printk("unable to allocate buffer pools\n");
+		ibmveth_cleanup(adapter);
+		return -ENOMEM;
+	}
+
+	memcpy(&mac_address, netdev->dev_addr, netdev->addr_len);
+	mac_address = mac_address >> 16;
+
+	rxq_desc.desc = 0;
+	rxq_desc.fields.valid = 1;
+	rxq_desc.fields.length = adapter->rx_queue.queue_len;
+	rxq_desc.fields.address = adapter->rx_queue.queue_dma;
+
+	ibmveth_debug_printk("buffer list @ 0x%p\n", adapter->buffer_list_addr);
+	ibmveth_debug_printk("filter list @ 0x%p\n", adapter->filter_list_addr);
+	ibmveth_debug_printk("receive q   @ 0x%p\n", adapter->rx_queue.queue_addr);
+
+    
+	lpar_rc = h_register_logical_lan(adapter->vdev->unit_address,
+					 adapter->buffer_list_dma,
+					 rxq_desc.desc,
+					 adapter->filter_list_dma,
+					 mac_address);
+
+	if(lpar_rc != H_Success) {
+		ibmveth_error_printk("h_register_logical_lan failed with %ld\n", lpar_rc);
+		ibmveth_error_printk("buffer TCE:0x%x filter TCE:0x%x rxq desc:0x%lx MAC:0x%lx\n",
+				     adapter->buffer_list_dma,
+				     adapter->filter_list_dma,
+				     rxq_desc.desc,
+				     mac_address);
+		ibmveth_cleanup(adapter);
+		return -ENONET; 
+	}
+
+	ibmveth_debug_printk("registering irq 0x%x\n", netdev->irq);
+	if((rc = request_irq(netdev->irq, &ibmveth_interrupt, 0, netdev->name, netdev)) != 0) {
+		ibmveth_error_printk("unable to request irq 0x%x, rc %d\n", netdev->irq, rc);
+		do {
+			rc = h_free_logical_lan(adapter->vdev->unit_address);
+		} while (H_isLongBusy(rc) || (rc == H_Busy));
+
+		ibmveth_cleanup(adapter);
+		return rc;
+	}
+
+	netif_start_queue(netdev);
+
+	ibmveth_debug_printk("scheduling initial replenish cycle\n");
+	ibmveth_schedule_replenishing(adapter);
+
+	ibmveth_debug_printk("open complete\n");
+
+	return 0;
+}
+
+static int ibmveth_close(struct net_device *netdev)
+{
+	struct ibmveth_adapter *adapter = netdev->priv;
+	long lpar_rc;
+    
+	ibmveth_debug_printk("close starting\n");
+
+	netif_stop_queue(netdev);
+
+	free_irq(netdev->irq, netdev);
+
+	cancel_delayed_work(&adapter->replenish_task);
+	flush_scheduled_work();
+
+	do {
+		lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
+	} while (H_isLongBusy(lpar_rc) || (lpar_rc == H_Busy));
+
+	if(lpar_rc != H_Success)
+	{
+		ibmveth_error_printk("h_free_logical_lan failed with %lx, continuing with close\n",
+				     lpar_rc);
+	}
+
+	adapter->rx_no_buffer = *(u64*)(((char*)adapter->buffer_list_addr) + 4096 - 8);
+
+	ibmveth_cleanup(adapter);
+
+	ibmveth_debug_printk("close complete\n");
+
+	return 0;
+}
+
+static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) {
+	cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
+	cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg | ADVERTISED_FIBRE);
+	cmd->speed = SPEED_1000;
+	cmd->duplex = DUPLEX_FULL;
+	cmd->port = PORT_FIBRE;
+	cmd->phy_address = 0;
+	cmd->transceiver = XCVR_INTERNAL;
+	cmd->autoneg = AUTONEG_ENABLE;
+	cmd->maxtxpkt = 0;
+	cmd->maxrxpkt = 1;
+	return 0;
+}
+
+static void netdev_get_drvinfo (struct net_device *dev, struct ethtool_drvinfo *info) {
+	strncpy(info->driver, ibmveth_driver_name, sizeof(info->driver) - 1);
+	strncpy(info->version, ibmveth_driver_version, sizeof(info->version) - 1);
+}
+
+static u32 netdev_get_link(struct net_device *dev) {
+	return 1;
+}
+
+static struct ethtool_ops netdev_ethtool_ops = {
+	.get_drvinfo		= netdev_get_drvinfo,
+	.get_settings		= netdev_get_settings,
+	.get_link		= netdev_get_link,
+	.get_sg			= ethtool_op_get_sg,
+	.get_tx_csum		= ethtool_op_get_tx_csum,
+};
+
+static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+	return -EOPNOTSUPP;
+}
+
+#define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
+
+static int ibmveth_start_xmit(struct sk_buff *skb, struct net_device *netdev)
+{
+	struct ibmveth_adapter *adapter = netdev->priv;
+	union ibmveth_buf_desc desc[IbmVethMaxSendFrags];
+	unsigned long lpar_rc;
+	int nfrags = 0, curfrag;
+	unsigned long correlator;
+	unsigned int retry_count;
+
+	if ((skb_shinfo(skb)->nr_frags + 1) > IbmVethMaxSendFrags) {
+		adapter->stats.tx_dropped++;
+		dev_kfree_skb(skb);
+		return 0;
+	}
+
+	memset(&desc, 0, sizeof(desc));
+
+	/* nfrags = number of frags after the initial fragment */
+	nfrags = skb_shinfo(skb)->nr_frags;
+
+	if(nfrags)
+		adapter->tx_multidesc_send++;
+
+	/* map the initial fragment */
+	desc[0].fields.length  = nfrags ? skb->len - skb->data_len : skb->len;
+	desc[0].fields.address = dma_map_single(&adapter->vdev->dev, skb->data,
+					desc[0].fields.length, DMA_TO_DEVICE);
+	desc[0].fields.valid   = 1;
+
+	if(dma_mapping_error(desc[0].fields.address)) {
+		ibmveth_error_printk("tx: unable to map initial fragment\n");
+		adapter->tx_map_failed++;
+		adapter->stats.tx_dropped++;
+		dev_kfree_skb(skb);
+		return 0;
+	}
+
+	curfrag = nfrags;
+
+	/* map fragments past the initial portion if there are any */
+	while(curfrag--) {
+		skb_frag_t *frag = &skb_shinfo(skb)->frags[curfrag];
+		desc[curfrag+1].fields.address
+			= dma_map_single(&adapter->vdev->dev,
+				page_address(frag->page) + frag->page_offset,
+				frag->size, DMA_TO_DEVICE);
+		desc[curfrag+1].fields.length = frag->size;
+		desc[curfrag+1].fields.valid  = 1;
+
+		if(dma_mapping_error(desc[curfrag+1].fields.address)) {
+			ibmveth_error_printk("tx: unable to map fragment %d\n", curfrag);
+			adapter->tx_map_failed++;
+			adapter->stats.tx_dropped++;
+			/* Free all the mappings we just created */
+			while(curfrag < nfrags) {
+				dma_unmap_single(&adapter->vdev->dev,
+						 desc[curfrag+1].fields.address,
+						 desc[curfrag+1].fields.length,
+						 DMA_TO_DEVICE);
+				curfrag++;
+			}
+			dev_kfree_skb(skb);
+			return 0;
+		}
+	}
+
+	/* send the frame. Arbitrarily set retrycount to 1024 */
+	correlator = 0;
+	retry_count = 1024;
+	do {
+		lpar_rc = h_send_logical_lan(adapter->vdev->unit_address,
+					     desc[0].desc,
+					     desc[1].desc,
+					     desc[2].desc,
+					     desc[3].desc,
+					     desc[4].desc,
+					     desc[5].desc,
+					     correlator);
+	} while ((lpar_rc == H_Busy) && (retry_count--));
+    
+	if(lpar_rc != H_Success && lpar_rc != H_Dropped) {
+		int i;
+		ibmveth_error_printk("tx: h_send_logical_lan failed with rc=%ld\n", lpar_rc);
+		for(i = 0; i < 6; i++) {
+			ibmveth_error_printk("tx: desc[%i] valid=%d, len=%d, address=0x%d\n", i,
+					     desc[i].fields.valid, desc[i].fields.length, desc[i].fields.address);
+		}
+		adapter->tx_send_failed++;
+		adapter->stats.tx_dropped++;
+	} else {
+		adapter->stats.tx_packets++;
+		adapter->stats.tx_bytes += skb->len;
+	}
+
+	do {
+		dma_unmap_single(&adapter->vdev->dev,
+				desc[nfrags].fields.address,
+				desc[nfrags].fields.length, DMA_TO_DEVICE);
+	} while(--nfrags >= 0);
+
+	dev_kfree_skb(skb);
+	return 0;
+}
+
+static int ibmveth_poll(struct net_device *netdev, int *budget)
+{
+	struct ibmveth_adapter *adapter = netdev->priv;
+	int max_frames_to_process = netdev->quota;
+	int frames_processed = 0;
+	int more_work = 1;
+	unsigned long lpar_rc;
+
+ restart_poll:
+	do {
+		struct net_device *netdev = adapter->netdev;
+
+		if(ibmveth_rxq_pending_buffer(adapter)) {
+			struct sk_buff *skb;
+
+			rmb();
+
+			if(!ibmveth_rxq_buffer_valid(adapter)) {
+				wmb(); /* suggested by larson1 */
+				adapter->rx_invalid_buffer++;
+				ibmveth_debug_printk("recycling invalid buffer\n");
+				ibmveth_rxq_recycle_buffer(adapter);
+			} else {
+				int length = ibmveth_rxq_frame_length(adapter);
+				int offset = ibmveth_rxq_frame_offset(adapter);
+				skb = ibmveth_rxq_get_buffer(adapter);
+
+				ibmveth_rxq_harvest_buffer(adapter);
+
+				skb_reserve(skb, offset);
+				skb_put(skb, length);
+				skb->dev = netdev;
+				skb->protocol = eth_type_trans(skb, netdev);
+
+				netif_receive_skb(skb);	/* send it up */
+
+				adapter->stats.rx_packets++;
+				adapter->stats.rx_bytes += length;
+				frames_processed++;
+			}
+		} else {
+			more_work = 0;
+		}
+	} while(more_work && (frames_processed < max_frames_to_process));
+
+	ibmveth_schedule_replenishing(adapter);
+
+	if(more_work) {
+		/* more work to do - return that we are not done yet */
+		netdev->quota -= frames_processed;
+		*budget -= frames_processed;
+		return 1; 
+	}
+
+	/* we think we are done - reenable interrupts, then check once more to make sure we are done */
+	lpar_rc = h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_ENABLE);
+
+	ibmveth_assert(lpar_rc == H_Success);
+
+	netif_rx_complete(netdev);
+
+	if(ibmveth_rxq_pending_buffer(adapter) && netif_rx_reschedule(netdev, frames_processed))
+	{
+		lpar_rc = h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
+		ibmveth_assert(lpar_rc == H_Success);
+		more_work = 1;
+		goto restart_poll;
+	}
+
+	netdev->quota -= frames_processed;
+	*budget -= frames_processed;
+
+	/* we really are done */
+	return 0;
+}
+
+static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance, struct pt_regs *regs)
+{   
+	struct net_device *netdev = dev_instance;
+	struct ibmveth_adapter *adapter = netdev->priv;
+	unsigned long lpar_rc;
+
+	if(netif_rx_schedule_prep(netdev)) {
+		lpar_rc = h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
+		ibmveth_assert(lpar_rc == H_Success);
+		__netif_rx_schedule(netdev);
+	}
+	return IRQ_HANDLED;
+}
+
+static struct net_device_stats *ibmveth_get_stats(struct net_device *dev)
+{
+	struct ibmveth_adapter *adapter = dev->priv;
+	return &adapter->stats;
+}
+
+static void ibmveth_set_multicast_list(struct net_device *netdev)
+{
+	struct ibmveth_adapter *adapter = netdev->priv;
+	unsigned long lpar_rc;
+
+	if((netdev->flags & IFF_PROMISC) || (netdev->mc_count > adapter->mcastFilterSize)) {
+		lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
+					   IbmVethMcastEnableRecv |
+					   IbmVethMcastDisableFiltering,
+					   0);
+		if(lpar_rc != H_Success) {
+			ibmveth_error_printk("h_multicast_ctrl rc=%ld when entering promisc mode\n", lpar_rc);
+		}
+	} else {
+		struct dev_mc_list *mclist = netdev->mc_list;
+		int i;
+		/* clear the filter table & disable filtering */
+		lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
+					   IbmVethMcastEnableRecv |
+					   IbmVethMcastDisableFiltering |
+					   IbmVethMcastClearFilterTable,
+					   0);
+		if(lpar_rc != H_Success) {
+			ibmveth_error_printk("h_multicast_ctrl rc=%ld when attempting to clear filter table\n", lpar_rc);
+		}
+		/* add the addresses to the filter table */
+		for(i = 0; i < netdev->mc_count; ++i, mclist = mclist->next) {
+			// add the multicast address to the filter table
+			unsigned long mcast_addr = 0;
+			memcpy(((char *)&mcast_addr)+2, mclist->dmi_addr, 6);
+			lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
+						   IbmVethMcastAddFilter,
+						   mcast_addr);
+			if(lpar_rc != H_Success) {
+				ibmveth_error_printk("h_multicast_ctrl rc=%ld when adding an entry to the filter table\n", lpar_rc);
+			}
+		}
+	
+		/* re-enable filtering */
+		lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
+					   IbmVethMcastEnableFiltering,
+					   0);
+		if(lpar_rc != H_Success) {
+			ibmveth_error_printk("h_multicast_ctrl rc=%ld when enabling filtering\n", lpar_rc);
+		}
+	}
+}
+
+static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
+{
+	if ((new_mtu < 68) || (new_mtu > (1<<20)))
+		return -EINVAL;
+	dev->mtu = new_mtu;
+	return 0;	
+}
+
+static int __devinit ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
+{
+	int rc;
+	struct net_device *netdev;
+	struct ibmveth_adapter *adapter;
+
+	unsigned char *mac_addr_p;
+	unsigned int *mcastFilterSize_p;
+
+
+	ibmveth_debug_printk_no_adapter("entering ibmveth_probe for UA 0x%x\n", 
+					dev->unit_address);
+
+	mac_addr_p = (unsigned char *) vio_get_attribute(dev, VETH_MAC_ADDR, 0);
+	if(!mac_addr_p) {
+		printk(KERN_ERR "(%s:%3.3d) ERROR: Can't find VETH_MAC_ADDR "
+				"attribute\n", __FILE__, __LINE__);
+		return 0;
+	}
+	
+	mcastFilterSize_p= (unsigned int *) vio_get_attribute(dev, VETH_MCAST_FILTER_SIZE, 0);
+	if(!mcastFilterSize_p) {
+		printk(KERN_ERR "(%s:%3.3d) ERROR: Can't find "
+				"VETH_MCAST_FILTER_SIZE attribute\n",
+				__FILE__, __LINE__);
+		return 0;
+	}
+	
+	netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
+
+	if(!netdev)
+		return -ENOMEM;
+
+	SET_MODULE_OWNER(netdev);
+
+	adapter = netdev->priv;
+	memset(adapter, 0, sizeof(adapter));
+	dev->dev.driver_data = netdev;
+
+	adapter->vdev = dev;
+	adapter->netdev = netdev;
+	adapter->mcastFilterSize= *mcastFilterSize_p;
+	
+	/* 	Some older boxes running PHYP non-natively have an OF that
+		returns a 8-byte local-mac-address field (and the first 
+		2 bytes have to be ignored) while newer boxes' OF return
+		a 6-byte field. Note that IEEE 1275 specifies that 
+		local-mac-address must be a 6-byte field.
+		The RPA doc specifies that the first byte must be 10b, so 
+		we'll just look for it to solve this 8 vs. 6 byte field issue */
+
+	if ((*mac_addr_p & 0x3) != 0x02)
+		mac_addr_p += 2;
+
+	adapter->mac_addr = 0;
+	memcpy(&adapter->mac_addr, mac_addr_p, 6);
+
+	adapter->liobn = dev->iommu_table->it_index;
+	
+	netdev->irq = dev->irq;
+	netdev->open               = ibmveth_open;
+	netdev->poll               = ibmveth_poll;
+	netdev->weight             = 16;
+	netdev->stop               = ibmveth_close;
+	netdev->hard_start_xmit    = ibmveth_start_xmit;
+	netdev->get_stats          = ibmveth_get_stats;
+	netdev->set_multicast_list = ibmveth_set_multicast_list;
+	netdev->do_ioctl           = ibmveth_ioctl;
+	netdev->ethtool_ops           = &netdev_ethtool_ops;
+	netdev->change_mtu         = ibmveth_change_mtu;
+	SET_NETDEV_DEV(netdev, &dev->dev);
+
+	memcpy(&netdev->dev_addr, &adapter->mac_addr, netdev->addr_len);
+
+	ibmveth_init_buffer_pool(&adapter->rx_buff_pool[0], 0, IbmVethPool0DftCnt, IbmVethPool0DftSize);
+	ibmveth_init_buffer_pool(&adapter->rx_buff_pool[1], 1, IbmVethPool1DftCnt, IbmVethPool1DftSize);
+	ibmveth_init_buffer_pool(&adapter->rx_buff_pool[2], 2, IbmVethPool2DftCnt, IbmVethPool2DftSize);
+
+	ibmveth_debug_printk("adapter @ 0x%p\n", adapter);
+
+	INIT_WORK(&adapter->replenish_task, (void*)ibmveth_replenish_task, (void*)adapter);
+
+	adapter->buffer_list_dma = DMA_ERROR_CODE;
+	adapter->filter_list_dma = DMA_ERROR_CODE;
+	adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
+
+	atomic_set(&adapter->not_replenishing, 1);
+
+	ibmveth_debug_printk("registering netdev...\n");
+
+	rc = register_netdev(netdev);
+
+	if(rc) {
+		ibmveth_debug_printk("failed to register netdev rc=%d\n", rc);
+		free_netdev(netdev);
+		return rc;
+	}
+
+	ibmveth_debug_printk("registered\n");
+
+	ibmveth_proc_register_adapter(adapter);
+
+	return 0;
+}
+
+static int __devexit ibmveth_remove(struct vio_dev *dev)
+{
+	struct net_device *netdev = dev->dev.driver_data;
+	struct ibmveth_adapter *adapter = netdev->priv;
+
+	unregister_netdev(netdev);
+
+	ibmveth_proc_unregister_adapter(adapter);
+
+	free_netdev(netdev);
+	return 0;
+}
+
+#ifdef CONFIG_PROC_FS
+static void ibmveth_proc_register_driver(void)
+{
+	ibmveth_proc_dir = create_proc_entry(IBMVETH_PROC_DIR, S_IFDIR, proc_net);
+	if (ibmveth_proc_dir) {
+		SET_MODULE_OWNER(ibmveth_proc_dir);
+	}
+}
+
+static void ibmveth_proc_unregister_driver(void)
+{
+	remove_proc_entry(IBMVETH_PROC_DIR, proc_net);
+}
+
+static void *ibmveth_seq_start(struct seq_file *seq, loff_t *pos) 
+{
+	if (*pos == 0) {
+		return (void *)1;
+	} else {
+		return NULL;
+	}
+}
+
+static void *ibmveth_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	++*pos;
+	return NULL;
+}
+
+static void ibmveth_seq_stop(struct seq_file *seq, void *v) 
+{
+}
+
+static int ibmveth_seq_show(struct seq_file *seq, void *v) 
+{
+	struct ibmveth_adapter *adapter = seq->private;
+	char *current_mac = ((char*) &adapter->netdev->dev_addr);
+	char *firmware_mac = ((char*) &adapter->mac_addr) ;
+
+	seq_printf(seq, "%s %s\n\n", ibmveth_driver_string, ibmveth_driver_version);
+	
+	seq_printf(seq, "Unit Address:    0x%x\n", adapter->vdev->unit_address);
+	seq_printf(seq, "LIOBN:           0x%lx\n", adapter->liobn);
+	seq_printf(seq, "Current MAC:     %02X:%02X:%02X:%02X:%02X:%02X\n",
+		   current_mac[0], current_mac[1], current_mac[2],
+		   current_mac[3], current_mac[4], current_mac[5]);
+	seq_printf(seq, "Firmware MAC:    %02X:%02X:%02X:%02X:%02X:%02X\n",
+		   firmware_mac[0], firmware_mac[1], firmware_mac[2],
+		   firmware_mac[3], firmware_mac[4], firmware_mac[5]);
+	
+	seq_printf(seq, "\nAdapter Statistics:\n");
+	seq_printf(seq, "  TX:  skbuffs linearized:          %ld\n", adapter->tx_linearized);
+	seq_printf(seq, "       multi-descriptor sends:      %ld\n", adapter->tx_multidesc_send);
+	seq_printf(seq, "       skb_linearize failures:      %ld\n", adapter->tx_linearize_failed);
+	seq_printf(seq, "       vio_map_single failres:      %ld\n", adapter->tx_map_failed);
+	seq_printf(seq, "       send failures:               %ld\n", adapter->tx_send_failed);
+	seq_printf(seq, "  RX:  replenish task cycles:       %ld\n", adapter->replenish_task_cycles);
+	seq_printf(seq, "       alloc_skb_failures:          %ld\n", adapter->replenish_no_mem);
+	seq_printf(seq, "       add buffer failures:         %ld\n", adapter->replenish_add_buff_failure);
+	seq_printf(seq, "       invalid buffers:             %ld\n", adapter->rx_invalid_buffer);
+	seq_printf(seq, "       no buffers:                  %ld\n", adapter->rx_no_buffer);
+	
+	return 0;
+}
+static struct seq_operations ibmveth_seq_ops = {
+	.start = ibmveth_seq_start,
+	.next  = ibmveth_seq_next,
+	.stop  = ibmveth_seq_stop,
+	.show  = ibmveth_seq_show,
+};
+
+static int ibmveth_proc_open(struct inode *inode, struct file *file)
+{
+	struct seq_file *seq;
+	struct proc_dir_entry *proc;
+	int rc;
+
+	rc = seq_open(file, &ibmveth_seq_ops);
+	if (!rc) {
+		/* recover the pointer buried in proc_dir_entry data */
+		seq = file->private_data;
+		proc = PDE(inode);
+		seq->private = proc->data;
+	}
+	return rc;
+}
+
+static struct file_operations ibmveth_proc_fops = {
+	.owner	 = THIS_MODULE,
+	.open    = ibmveth_proc_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = seq_release,
+};
+
+static void ibmveth_proc_register_adapter(struct ibmveth_adapter *adapter)
+{
+	struct proc_dir_entry *entry;
+	if (ibmveth_proc_dir) {
+		entry = create_proc_entry(adapter->netdev->name, S_IFREG, ibmveth_proc_dir);
+		if (!entry) {
+			ibmveth_error_printk("Cannot create adapter proc entry");
+		} else {
+			entry->data = (void *) adapter;
+			entry->proc_fops = &ibmveth_proc_fops;
+			SET_MODULE_OWNER(entry);
+		}
+	}
+	return;
+}
+
+static void ibmveth_proc_unregister_adapter(struct ibmveth_adapter *adapter)
+{
+	if (ibmveth_proc_dir) {
+		remove_proc_entry(adapter->netdev->name, ibmveth_proc_dir);
+	}
+}
+
+#else /* CONFIG_PROC_FS */
+static void ibmveth_proc_register_adapter(struct ibmveth_adapter *adapter) 
+{
+}
+
+static void ibmveth_proc_unregister_adapter(struct ibmveth_adapter *adapter) 
+{
+}
+static void ibmveth_proc_register_driver(void)
+{
+}
+
+static void ibmveth_proc_unregister_driver(void)
+{
+}
+#endif /* CONFIG_PROC_FS */
+
+static struct vio_device_id ibmveth_device_table[] __devinitdata= {
+	{ "network", "IBM,l-lan"},
+	{ 0,}
+};
+
+MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
+
+static struct vio_driver ibmveth_driver = {
+	.name        = (char *)ibmveth_driver_name,
+	.id_table    = ibmveth_device_table,
+	.probe       = ibmveth_probe,
+	.remove      = ibmveth_remove
+};
+
+static int __init ibmveth_module_init(void)
+{
+	ibmveth_printk("%s: %s %s\n", ibmveth_driver_name, ibmveth_driver_string, ibmveth_driver_version);
+
+	ibmveth_proc_register_driver();
+
+	return vio_register_driver(&ibmveth_driver);
+}
+
+static void __exit ibmveth_module_exit(void)
+{
+	vio_unregister_driver(&ibmveth_driver);
+	ibmveth_proc_unregister_driver();
+}	
+
+module_init(ibmveth_module_init);
+module_exit(ibmveth_module_exit);