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linux/drivers/net/ibmveth.c

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/**************************************************************************/
/* */
/* 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 "net/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 = proc_mkdir(IBMVETH_PROC_DIR, NULL);
if (ibmveth_proc_dir) {
SET_MODULE_OWNER(ibmveth_proc_dir);
}
}
static void ibmveth_proc_unregister_driver(void)
{
remove_proc_entry(IBMVETH_PROC_DIR, NULL);
}
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"},
{ "", "" }
};
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);
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