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/module.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/vio.h>
#include <asm/uaccess.h>
#include <linux/seq_file.h>
#include "ibmveth.h"
#undef DEBUG
#define ibmveth_printk(fmt, args...) \
printk(KERN_DEBUG "%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);
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 13:55:46 +00:00
static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
static inline void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
static struct kobj_type ktype_veth_pool;
#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, u32 pool_active)
{
pool->size = pool_size;
pool->index = pool_index;
pool->buff_size = buff_size;
pool->threshold = pool_size / 2;
pool->active = pool_active;
}
/* 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->consumer_index = (pool->consumer_index + 1) % 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] = index;
pool->skbuff[index] = NULL;
if (pool->consumer_index == 0)
pool->consumer_index = pool->size - 1;
else
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));
}
/* replenish routine */
static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
{
int i;
adapter->replenish_task_cycles++;
for(i = 0; i < IbmVethNumBufferPools; i++)
if(adapter->rx_buff_pool[i].active)
ibmveth_replenish_buffer_pool(adapter,
&adapter->rx_buff_pool[i]);
adapter->rx_no_buffer = *(u64*)(((char*)adapter->buffer_list_addr) + 4096 - 8);
}
/* 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;
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].producer_index
= (adapter->rx_buff_pool[pool].producer_index + 1)
% 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);
if(!adapter->rx_buff_pool[pool].active) {
ibmveth_rxq_harvest_buffer(adapter);
ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
return;
}
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)
{
int i;
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;
}
for(i = 0; i<IbmVethNumBufferPools; i++)
if (adapter->rx_buff_pool[i].active)
ibmveth_free_buffer_pool(adapter,
&adapter->rx_buff_pool[i]);
}
static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
union ibmveth_buf_desc rxq_desc, u64 mac_address)
{
int rc, try_again = 1;
/* After a kexec the adapter will still be open, so our attempt to
* open it will fail. So if we get a failure we free the adapter and
* try again, but only once. */
retry:
rc = h_register_logical_lan(adapter->vdev->unit_address,
adapter->buffer_list_dma, rxq_desc.desc,
adapter->filter_list_dma, mac_address);
if (rc != H_SUCCESS && try_again) {
do {
rc = h_free_logical_lan(adapter->vdev->unit_address);
} while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
try_again = 0;
goto retry;
}
return rc;
}
static int ibmveth_open(struct net_device *netdev)
{
struct ibmveth_adapter *adapter = netdev->priv;
u64 mac_address = 0;
int rxq_entries = 1;
unsigned long lpar_rc;
int rc;
union ibmveth_buf_desc rxq_desc;
int i;
ibmveth_debug_printk("open starting\n");
for(i = 0; i<IbmVethNumBufferPools; i++)
rxq_entries += adapter->rx_buff_pool[i].size;
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;
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);
h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, 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%lx filter TCE:0x%lx 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;
}
for(i = 0; i<IbmVethNumBufferPools; i++) {
if(!adapter->rx_buff_pool[i].active)
continue;
if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
ibmveth_error_printk("unable to alloc pool\n");
adapter->rx_buff_pool[i].active = 0;
ibmveth_cleanup(adapter);
return -ENOMEM ;
}
}
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_IS_LONG_BUSY(rc) || (rc == H_BUSY));
ibmveth_cleanup(adapter);
return rc;
}
ibmveth_debug_printk("initial replenish cycle\n");
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 13:55:46 +00:00
ibmveth_interrupt(netdev->irq, netdev);
netif_start_queue(netdev);
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");
if (!adapter->pool_config)
netif_stop_queue(netdev);
free_irq(netdev->irq, netdev);
do {
lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
} while (H_IS_LONG_BUSY(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 const 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 long flags;
unsigned int retry_count;
unsigned int tx_dropped = 0;
unsigned int tx_bytes = 0;
unsigned int tx_packets = 0;
unsigned int tx_send_failed = 0;
unsigned int tx_map_failed = 0;
if ((skb_shinfo(skb)->nr_frags + 1) > IbmVethMaxSendFrags) {
tx_dropped++;
goto out;
}
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");
tx_map_failed++;
tx_dropped++;
goto out;
}
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);
tx_map_failed++;
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++;
}
goto out;
}
}
/* 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,
&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);
}
tx_send_failed++;
tx_dropped++;
} else {
tx_packets++;
tx_bytes += skb->len;
netdev->trans_start = jiffies;
}
do {
dma_unmap_single(&adapter->vdev->dev,
desc[nfrags].fields.address,
desc[nfrags].fields.length, DMA_TO_DEVICE);
} while(--nfrags >= 0);
out: spin_lock_irqsave(&adapter->stats_lock, flags);
adapter->stats.tx_dropped += tx_dropped;
adapter->stats.tx_bytes += tx_bytes;
adapter->stats.tx_packets += tx_packets;
adapter->tx_send_failed += tx_send_failed;
adapter->tx_map_failed += tx_map_failed;
spin_unlock_irqrestore(&adapter->stats_lock, flags);
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++;
netdev->last_rx = jiffies;
}
} else {
more_work = 0;
}
} while(more_work && (frames_processed < max_frames_to_process));
ibmveth_replenish_task(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;
}
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 13:55:46 +00:00
static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
{
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)
{
struct ibmveth_adapter *adapter = dev->priv;
int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
int i;
if (new_mtu < IBMVETH_MAX_MTU)
return -EINVAL;
/* Look for an active buffer pool that can hold the new MTU */
for(i = 0; i<IbmVethNumBufferPools; i++) {
if (!adapter->rx_buff_pool[i].active)
continue;
if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) {
dev->mtu = new_mtu;
return 0;
}
}
return -EINVAL;
}
#ifdef CONFIG_NET_POLL_CONTROLLER
static void ibmveth_poll_controller(struct net_device *dev)
{
ibmveth_replenish_task(dev->priv);
ibmveth_interrupt(dev->irq, dev);
}
#endif
static int __devinit ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
{
int rc, i;
struct net_device *netdev;
struct ibmveth_adapter *adapter = NULL;
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;
adapter->pool_config = 0;
/* 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);
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);
#ifdef CONFIG_NET_POLL_CONTROLLER
netdev->poll_controller = ibmveth_poll_controller;
#endif
netdev->features |= NETIF_F_LLTX;
spin_lock_init(&adapter->stats_lock);
memcpy(&netdev->dev_addr, &adapter->mac_addr, netdev->addr_len);
for(i = 0; i<IbmVethNumBufferPools; i++) {
struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
pool_count[i], pool_size[i],
pool_active[i]);
kobj->parent = &dev->dev.kobj;
sprintf(kobj->name, "pool%d", i);
kobj->ktype = &ktype_veth_pool;
kobject_register(kobj);
}
ibmveth_debug_printk("adapter @ 0x%p\n", adapter);
adapter->buffer_list_dma = DMA_ERROR_CODE;
adapter->filter_list_dma = DMA_ERROR_CODE;
adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
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;
int i;
for(i = 0; i<IbmVethNumBufferPools; i++)
kobject_unregister(&adapter->rx_buff_pool[i].kobj);
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, "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 const 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) {
char u_addr[10];
sprintf(u_addr, "%x", adapter->vdev->unit_address);
entry = create_proc_entry(u_addr, 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) {
char u_addr[10];
sprintf(u_addr, "%x", adapter->vdev->unit_address);
remove_proc_entry(u_addr, 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 attribute veth_active_attr;
static struct attribute veth_num_attr;
static struct attribute veth_size_attr;
static ssize_t veth_pool_show(struct kobject * kobj,
struct attribute * attr, char * buf)
{
struct ibmveth_buff_pool *pool = container_of(kobj,
struct ibmveth_buff_pool,
kobj);
if (attr == &veth_active_attr)
return sprintf(buf, "%d\n", pool->active);
else if (attr == &veth_num_attr)
return sprintf(buf, "%d\n", pool->size);
else if (attr == &veth_size_attr)
return sprintf(buf, "%d\n", pool->buff_size);
return 0;
}
static ssize_t veth_pool_store(struct kobject * kobj, struct attribute * attr,
const char * buf, size_t count)
{
struct ibmveth_buff_pool *pool = container_of(kobj,
struct ibmveth_buff_pool,
kobj);
struct net_device *netdev =
container_of(kobj->parent, struct device, kobj)->driver_data;
struct ibmveth_adapter *adapter = netdev->priv;
long value = simple_strtol(buf, NULL, 10);
long rc;
if (attr == &veth_active_attr) {
if (value && !pool->active) {
if(ibmveth_alloc_buffer_pool(pool)) {
ibmveth_error_printk("unable to alloc pool\n");
return -ENOMEM;
}
pool->active = 1;
adapter->pool_config = 1;
ibmveth_close(netdev);
adapter->pool_config = 0;
if ((rc = ibmveth_open(netdev)))
return rc;
} else if (!value && pool->active) {
int mtu = netdev->mtu + IBMVETH_BUFF_OH;
int i;
/* Make sure there is a buffer pool with buffers that
can hold a packet of the size of the MTU */
for(i = 0; i<IbmVethNumBufferPools; i++) {
if (pool == &adapter->rx_buff_pool[i])
continue;
if (!adapter->rx_buff_pool[i].active)
continue;
if (mtu < adapter->rx_buff_pool[i].buff_size) {
pool->active = 0;
h_free_logical_lan_buffer(adapter->
vdev->
unit_address,
pool->
buff_size);
}
}
if (pool->active) {
ibmveth_error_printk("no active pool >= MTU\n");
return -EPERM;
}
}
} else if (attr == &veth_num_attr) {
if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT)
return -EINVAL;
else {
adapter->pool_config = 1;
ibmveth_close(netdev);
adapter->pool_config = 0;
pool->size = value;
if ((rc = ibmveth_open(netdev)))
return rc;
}
} else if (attr == &veth_size_attr) {
if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE)
return -EINVAL;
else {
adapter->pool_config = 1;
ibmveth_close(netdev);
adapter->pool_config = 0;
pool->buff_size = value;
if ((rc = ibmveth_open(netdev)))
return rc;
}
}
/* kick the interrupt handler to allocate/deallocate pools */
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 13:55:46 +00:00
ibmveth_interrupt(netdev->irq, netdev);
return count;
}
#define ATTR(_name, _mode) \
struct attribute veth_##_name##_attr = { \
.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE \
};
static ATTR(active, 0644);
static ATTR(num, 0644);
static ATTR(size, 0644);
static struct attribute * veth_pool_attrs[] = {
&veth_active_attr,
&veth_num_attr,
&veth_size_attr,
NULL,
};
static struct sysfs_ops veth_pool_ops = {
.show = veth_pool_show,
.store = veth_pool_store,
};
static struct kobj_type ktype_veth_pool = {
.release = NULL,
.sysfs_ops = &veth_pool_ops,
.default_attrs = veth_pool_attrs,
};
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 = {
.id_table = ibmveth_device_table,
.probe = ibmveth_probe,
.remove = ibmveth_remove,
.driver = {
.name = ibmveth_driver_name,
.owner = THIS_MODULE,
}
};
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);