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linux/drivers/net/wan/sdlamain.c
Herbert Xu e5ed639913 [IPV4]: Replace __in_dev_get with __in_dev_get_rcu/rtnl 
The following patch renames __in_dev_get() to __in_dev_get_rtnl() and
introduces __in_dev_get_rcu() to cover the second case.

1) RCU with refcnt should use in_dev_get().
2) RCU without refcnt should use __in_dev_get_rcu().
3) All others must hold RTNL and use __in_dev_get_rtnl().

There is one exception in net/ipv4/route.c which is in fact a pre-existing
race condition.  I've marked it as such so that we remember to fix it.

This patch is based on suggestions and prior work by Suzanne Wood and
Paul McKenney.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-03 14:35:55 -07:00

1347 lines
37 KiB
C
Raw Blame History

/****************************************************************************
* sdlamain.c WANPIPE(tm) Multiprotocol WAN Link Driver. Main module.
*
* Author: Nenad Corbic <ncorbic@sangoma.com>
* Gideon Hack
*
* Copyright: (c) 1995-2000 Sangoma Technologies Inc.
*
* 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.
* ============================================================================
* Dec 22, 2000 Nenad Corbic Updated for 2.4.X kernels.
* Removed the polling routine.
* Nov 13, 2000 Nenad Corbic Added hw probing on module load and dynamic
* device allocation.
* Nov 7, 2000 Nenad Corbic Fixed the Multi-Port PPP for kernels
* 2.2.16 and above.
* Aug 2, 2000 Nenad Corbic Block the Multi-Port PPP from running on
* kernels 2.2.16 or greater. The SyncPPP
* has changed.
* Jul 25, 2000 Nenad Corbic Updated the Piggiback support for MultPPPP.
* Jul 13, 2000 Nenad Corbic Added Multi-PPP support.
* Feb 02, 2000 Nenad Corbic Fixed up piggyback probing and selection.
* Sep 23, 1999 Nenad Corbic Added support for SMP
* Sep 13, 1999 Nenad Corbic Each port is treated as a separate device.
* Jun 02, 1999 Gideon Hack Added support for the S514 adapter.
* Updates for Linux 2.2.X kernels.
* Sep 17, 1998 Jaspreet Singh Updated for 2.1.121+ kernel
* Nov 28, 1997 Jaspreet Singh Changed DRV_RELEASE to 1
* Nov 10, 1997 Jaspreet Singh Changed sti() to restore_flags();
* Nov 06, 1997 Jaspreet Singh Changed DRV_VERSION to 4 and DRV_RELEASE to 0
* Oct 20, 1997 Jaspreet Singh Modified sdla_isr routine so that card->in_isr
* assignments are taken out and placed in the
* sdla_ppp.c, sdla_fr.c and sdla_x25.c isr
* routines. Took out 'wandev->tx_int_enabled' and
* replaced it with 'wandev->enable_tx_int'.
* May 29, 1997 Jaspreet Singh Flow Control Problem
* added "wandev->tx_int_enabled=1" line in the
* init module. This line initializes the flag for
* preventing Interrupt disabled with device set to
* busy
* Jan 15, 1997 Gene Kozin Version 3.1.0
* o added UDP management stuff
* Jan 02, 1997 Gene Kozin Initial version.
*****************************************************************************/
#include <linux/config.h> /* OS configuration options */
#include <linux/stddef.h> /* offsetof(), etc. */
#include <linux/errno.h> /* return codes */
#include <linux/string.h> /* inline memset(), etc. */
#include <linux/init.h>
#include <linux/slab.h> /* kmalloc(), kfree() */
#include <linux/kernel.h> /* printk(), and other useful stuff */
#include <linux/module.h> /* support for loadable modules */
#include <linux/ioport.h> /* request_region(), release_region() */
#include <linux/wanrouter.h> /* WAN router definitions */
#include <linux/wanpipe.h> /* WANPIPE common user API definitions */
#include <linux/rcupdate.h>
#include <linux/in.h>
#include <asm/io.h> /* phys_to_virt() */
#include <linux/pci.h>
#include <linux/sdlapci.h>
#include <linux/if_wanpipe_common.h>
#include <asm/uaccess.h> /* kernel <-> user copy */
#include <linux/inetdevice.h>
#include <linux/ip.h>
#include <net/route.h>
#define KMEM_SAFETYZONE 8
#ifndef CONFIG_WANPIPE_FR
#define wpf_init(a,b) (-EPROTONOSUPPORT)
#endif
#ifndef CONFIG_WANPIPE_CHDLC
#define wpc_init(a,b) (-EPROTONOSUPPORT)
#endif
#ifndef CONFIG_WANPIPE_X25
#define wpx_init(a,b) (-EPROTONOSUPPORT)
#endif
#ifndef CONFIG_WANPIPE_PPP
#define wpp_init(a,b) (-EPROTONOSUPPORT)
#endif
#ifndef CONFIG_WANPIPE_MULTPPP
#define wsppp_init(a,b) (-EPROTONOSUPPORT)
#endif
/***********FOR DEBUGGING PURPOSES*********************************************
static void * dbg_kmalloc(unsigned int size, int prio, int line) {
int i = 0;
void * v = kmalloc(size+sizeof(unsigned int)+2*KMEM_SAFETYZONE*8,prio);
char * c1 = v;
c1 += sizeof(unsigned int);
*((unsigned int *)v) = size;
for (i = 0; i < KMEM_SAFETYZONE; i++) {
c1[0] = 'D'; c1[1] = 'E'; c1[2] = 'A'; c1[3] = 'D';
c1[4] = 'B'; c1[5] = 'E'; c1[6] = 'E'; c1[7] = 'F';
c1 += 8;
}
c1 += size;
for (i = 0; i < KMEM_SAFETYZONE; i++) {
c1[0] = 'M'; c1[1] = 'U'; c1[2] = 'N'; c1[3] = 'G';
c1[4] = 'W'; c1[5] = 'A'; c1[6] = 'L'; c1[7] = 'L';
c1 += 8;
}
v = ((char *)v) + sizeof(unsigned int) + KMEM_SAFETYZONE*8;
printk(KERN_INFO "line %d kmalloc(%d,%d) = %p\n",line,size,prio,v);
return v;
}
static void dbg_kfree(void * v, int line) {
unsigned int * sp = (unsigned int *)(((char *)v) - (sizeof(unsigned int) + KMEM_SAFETYZONE*8));
unsigned int size = *sp;
char * c1 = ((char *)v) - KMEM_SAFETYZONE*8;
int i = 0;
for (i = 0; i < KMEM_SAFETYZONE; i++) {
if ( c1[0] != 'D' || c1[1] != 'E' || c1[2] != 'A' || c1[3] != 'D'
|| c1[4] != 'B' || c1[5] != 'E' || c1[6] != 'E' || c1[7] != 'F') {
printk(KERN_INFO "kmalloced block at %p has been corrupted (underrun)!\n",v);
printk(KERN_INFO " %4x: %2x %2x %2x %2x %2x %2x %2x %2x\n", i*8,
c1[0],c1[1],c1[2],c1[3],c1[4],c1[5],c1[6],c1[7] );
}
c1 += 8;
}
c1 += size;
for (i = 0; i < KMEM_SAFETYZONE; i++) {
if ( c1[0] != 'M' || c1[1] != 'U' || c1[2] != 'N' || c1[3] != 'G'
|| c1[4] != 'W' || c1[5] != 'A' || c1[6] != 'L' || c1[7] != 'L'
) {
printk(KERN_INFO "kmalloced block at %p has been corrupted (overrun):\n",v);
printk(KERN_INFO " %4x: %2x %2x %2x %2x %2x %2x %2x %2x\n", i*8,
c1[0],c1[1],c1[2],c1[3],c1[4],c1[5],c1[6],c1[7] );
}
c1 += 8;
}
printk(KERN_INFO "line %d kfree(%p)\n",line,v);
v = ((char *)v) - (sizeof(unsigned int) + KMEM_SAFETYZONE*8);
kfree(v);
}
#define kmalloc(x,y) dbg_kmalloc(x,y,__LINE__)
#define kfree(x) dbg_kfree(x,__LINE__)
******************************************************************************/
/****** Defines & Macros ****************************************************/
#ifdef _DEBUG_
#define STATIC
#else
#define STATIC static
#endif
#define DRV_VERSION 5 /* version number */
#define DRV_RELEASE 0 /* release (minor version) number */
#define MAX_CARDS 16 /* max number of adapters */
#ifndef CONFIG_WANPIPE_CARDS /* configurable option */
#define CONFIG_WANPIPE_CARDS 1
#endif
#define CMD_OK 0 /* normal firmware return code */
#define CMD_TIMEOUT 0xFF /* firmware command timed out */
#define MAX_CMD_RETRY 10 /* max number of firmware retries */
/****** Function Prototypes *************************************************/
extern void disable_irq(unsigned int);
extern void enable_irq(unsigned int);
/* WAN link driver entry points */
static int setup(struct wan_device* wandev, wandev_conf_t* conf);
static int shutdown(struct wan_device* wandev);
static int ioctl(struct wan_device* wandev, unsigned cmd, unsigned long arg);
/* IOCTL handlers */
static int ioctl_dump (sdla_t* card, sdla_dump_t* u_dump);
static int ioctl_exec (sdla_t* card, sdla_exec_t* u_exec, int);
/* Miscellaneous functions */
STATIC irqreturn_t sdla_isr (int irq, void* dev_id, struct pt_regs *regs);
static void release_hw (sdla_t *card);
static int check_s508_conflicts (sdla_t* card,wandev_conf_t* conf, int*);
static int check_s514_conflicts (sdla_t* card,wandev_conf_t* conf, int*);
/****** Global Data **********************************************************
* Note: All data must be explicitly initialized!!!
*/
/* private data */
static char drvname[] = "wanpipe";
static char fullname[] = "WANPIPE(tm) Multiprotocol Driver";
static char copyright[] = "(c) 1995-2000 Sangoma Technologies Inc.";
static int ncards;
static sdla_t* card_array; /* adapter data space */
/* Wanpipe's own workqueue, used for all API's.
* All protocol specific tasks will be inserted
* into the "wanpipe_wq" workqueue.
* The kernel workqueue mechanism will execute
* all pending tasks in the "wanpipe_wq" workqueue.
*/
struct workqueue_struct *wanpipe_wq;
DECLARE_WORK(wanpipe_work, NULL, NULL);
static int wanpipe_bh_critical;
/******* Kernel Loadable Module Entry Points ********************************/
/*============================================================================
* Module 'insert' entry point.
* o print announcement
* o allocate adapter data space
* o initialize static data
* o register all cards with WAN router
* o calibrate SDLA shared memory access delay.
*
* Return: 0 Ok
* < 0 error.
* Context: process
*/
static int __init wanpipe_init(void)
{
int cnt, err = 0;
printk(KERN_INFO "%s v%u.%u %s\n",
fullname, DRV_VERSION, DRV_RELEASE, copyright);
wanpipe_wq = create_workqueue("wanpipe_wq");
if (!wanpipe_wq)
return -ENOMEM;
/* Probe for wanpipe cards and return the number found */
printk(KERN_INFO "wanpipe: Probing for WANPIPE hardware.\n");
ncards = wanpipe_hw_probe();
if (ncards){
printk(KERN_INFO "wanpipe: Allocating maximum %i devices: wanpipe%i - wanpipe%i.\n",ncards,1,ncards);
}else{
printk(KERN_INFO "wanpipe: No S514/S508 cards found, unloading modules!\n");
destroy_workqueue(wanpipe_wq);
return -ENODEV;
}
/* Verify number of cards and allocate adapter data space */
card_array = kmalloc(sizeof(sdla_t) * ncards, GFP_KERNEL);
if (card_array == NULL) {
destroy_workqueue(wanpipe_wq);
return -ENOMEM;
}
memset(card_array, 0, sizeof(sdla_t) * ncards);
/* Register adapters with WAN router */
for (cnt = 0; cnt < ncards; ++ cnt) {
sdla_t* card = &card_array[cnt];
struct wan_device* wandev = &card->wandev;
card->next = NULL;
sprintf(card->devname, "%s%d", drvname, cnt + 1);
wandev->magic = ROUTER_MAGIC;
wandev->name = card->devname;
wandev->private = card;
wandev->enable_tx_int = 0;
wandev->setup = &setup;
wandev->shutdown = &shutdown;
wandev->ioctl = &ioctl;
err = register_wan_device(wandev);
if (err) {
printk(KERN_INFO
"%s: %s registration failed with error %d!\n",
drvname, card->devname, err);
break;
}
}
if (cnt){
ncards = cnt; /* adjust actual number of cards */
}else {
kfree(card_array);
destroy_workqueue(wanpipe_wq);
printk(KERN_INFO "IN Init Module: NO Cards registered\n");
err = -ENODEV;
}
return err;
}
/*============================================================================
* Module 'remove' entry point.
* o unregister all adapters from the WAN router
* o release all remaining system resources
*/
static void __exit wanpipe_cleanup(void)
{
int i;
if (!ncards)
return;
for (i = 0; i < ncards; ++i) {
sdla_t* card = &card_array[i];
unregister_wan_device(card->devname);
}
destroy_workqueue(wanpipe_wq);
kfree(card_array);
printk(KERN_INFO "\nwanpipe: WANPIPE Modules Unloaded.\n");
}
module_init(wanpipe_init);
module_exit(wanpipe_cleanup);
/******* WAN Device Driver Entry Points *************************************/
/*============================================================================
* Setup/configure WAN link driver.
* o check adapter state
* o make sure firmware is present in configuration
* o make sure I/O port and IRQ are specified
* o make sure I/O region is available
* o allocate interrupt vector
* o setup SDLA hardware
* o call appropriate routine to perform protocol-specific initialization
* o mark I/O region as used
* o if this is the first active card, then schedule background task
*
* This function is called when router handles ROUTER_SETUP IOCTL. The
* configuration structure is in kernel memory (including extended data, if
* any).
*/
static int setup(struct wan_device* wandev, wandev_conf_t* conf)
{
sdla_t* card;
int err = 0;
int irq=0;
/* Sanity checks */
if ((wandev == NULL) || (wandev->private == NULL) || (conf == NULL)){
printk(KERN_INFO
"%s: Failed Sdlamain Setup wandev %u, card %u, conf %u !\n",
wandev->name,
(unsigned int)wandev,(unsigned int)wandev->private,
(unsigned int)conf);
return -EFAULT;
}
printk(KERN_INFO "%s: Starting WAN Setup\n", wandev->name);
card = wandev->private;
if (wandev->state != WAN_UNCONFIGURED){
printk(KERN_INFO "%s: failed sdlamain setup, busy!\n",
wandev->name);
return -EBUSY; /* already configured */
}
printk(KERN_INFO "\nProcessing WAN device %s...\n", wandev->name);
/* Initialize the counters for each wandev
* Used for counting number of times new_if and
* del_if get called.
*/
wandev->del_if_cnt = 0;
wandev->new_if_cnt = 0;
wandev->config_id = conf->config_id;
if (!conf->data_size || (conf->data == NULL)) {
printk(KERN_INFO
"%s: firmware not found in configuration data!\n",
wandev->name);
return -EINVAL;
}
/* Check for resource conflicts and setup the
* card for piggibacking if necessary */
if(!conf->S514_CPU_no[0]) {
if ((err=check_s508_conflicts(card,conf,&irq)) != 0){
return err;
}
}else {
if ((err=check_s514_conflicts(card,conf,&irq)) != 0){
return err;
}
}
/* If the current card has already been configured
* or it's a piggyback card, do not try to allocate
* resources.
*/
if (!card->wandev.piggyback && !card->configured){
/* Configure hardware, load firmware, etc. */
memset(&card->hw, 0, sizeof(sdlahw_t));
/* for an S514 adapter, pass the CPU number and the slot number read */
/* from 'router.conf' to the 'sdla_setup()' function via the 'port' */
/* parameter */
if (conf->S514_CPU_no[0]){
card->hw.S514_cpu_no[0] = conf->S514_CPU_no[0];
card->hw.S514_slot_no = conf->PCI_slot_no;
card->hw.auto_pci_cfg = conf->auto_pci_cfg;
if (card->hw.auto_pci_cfg == WANOPT_YES){
printk(KERN_INFO "%s: Setting CPU to %c and Slot to Auto\n",
card->devname, card->hw.S514_cpu_no[0]);
}else{
printk(KERN_INFO "%s: Setting CPU to %c and Slot to %i\n",
card->devname, card->hw.S514_cpu_no[0], card->hw.S514_slot_no);
}
}else{
/* 508 Card io port and irq initialization */
card->hw.port = conf->ioport;
card->hw.irq = (conf->irq == 9) ? 2 : conf->irq;
}
/* Compute the virtual address of the card in kernel space */
if(conf->maddr){
card->hw.dpmbase = phys_to_virt(conf->maddr);
}else{
card->hw.dpmbase = (void *)conf->maddr;
}
card->hw.dpmsize = SDLA_WINDOWSIZE;
/* set the adapter type if using an S514 adapter */
card->hw.type = (conf->S514_CPU_no[0]) ? SDLA_S514 : conf->hw_opt[0];
card->hw.pclk = conf->hw_opt[1];
err = sdla_setup(&card->hw, conf->data, conf->data_size);
if (err){
printk(KERN_INFO "%s: Hardware setup Failed %i\n",
card->devname,err);
return err;
}
if(card->hw.type != SDLA_S514)
irq = (conf->irq == 2) ? 9 : conf->irq; /* IRQ2 -> IRQ9 */
else
irq = card->hw.irq;
/* request an interrupt vector - note that interrupts may be shared */
/* when using the S514 PCI adapter */
if(request_irq(irq, sdla_isr,
(card->hw.type == SDLA_S514) ? SA_SHIRQ : 0,
wandev->name, card)){
printk(KERN_INFO "%s: Can't reserve IRQ %d!\n", wandev->name, irq);
return -EINVAL;
}
}else{
printk(KERN_INFO "%s: Card Configured %lu or Piggybacking %i!\n",
wandev->name,card->configured,card->wandev.piggyback);
}
if (!card->configured){
/* Initialize the Spin lock */
printk(KERN_INFO "%s: Initializing for SMP\n",wandev->name);
/* Piggyback spin lock has already been initialized,
* in check_s514/s508_conflicts() */
if (!card->wandev.piggyback){
spin_lock_init(&card->wandev.lock);
}
/* Intialize WAN device data space */
wandev->irq = irq;
wandev->dma = 0;
if(card->hw.type != SDLA_S514){
wandev->ioport = card->hw.port;
}else{
wandev->S514_cpu_no[0] = card->hw.S514_cpu_no[0];
wandev->S514_slot_no = card->hw.S514_slot_no;
}
wandev->maddr = (unsigned long)card->hw.dpmbase;
wandev->msize = card->hw.dpmsize;
wandev->hw_opt[0] = card->hw.type;
wandev->hw_opt[1] = card->hw.pclk;
wandev->hw_opt[2] = card->hw.memory;
wandev->hw_opt[3] = card->hw.fwid;
}
/* Protocol-specific initialization */
switch (card->hw.fwid) {
case SFID_X25_502:
case SFID_X25_508:
printk(KERN_INFO "%s: Starting X.25 Protocol Init.\n",
card->devname);
err = wpx_init(card, conf);
break;
case SFID_FR502:
case SFID_FR508:
printk(KERN_INFO "%s: Starting Frame Relay Protocol Init.\n",
card->devname);
err = wpf_init(card, conf);
break;
case SFID_PPP502:
case SFID_PPP508:
printk(KERN_INFO "%s: Starting PPP Protocol Init.\n",
card->devname);
err = wpp_init(card, conf);
break;
case SFID_CHDLC508:
case SFID_CHDLC514:
if (conf->ft1){
printk(KERN_INFO "%s: Starting FT1 CSU/DSU Config Driver.\n",
card->devname);
err = wpft1_init(card, conf);
break;
}else if (conf->config_id == WANCONFIG_MPPP){
printk(KERN_INFO "%s: Starting Multi-Port PPP Protocol Init.\n",
card->devname);
err = wsppp_init(card,conf);
break;
}else{
printk(KERN_INFO "%s: Starting CHDLC Protocol Init.\n",
card->devname);
err = wpc_init(card, conf);
break;
}
default:
printk(KERN_INFO "%s: Error, Firmware is not supported %X %X!\n",
wandev->name,card->hw.fwid,SFID_CHDLC508);
err = -EPROTONOSUPPORT;
}
if (err != 0){
if (err == -EPROTONOSUPPORT){
printk(KERN_INFO
"%s: Error, Protocol selected has not been compiled!\n",
card->devname);
printk(KERN_INFO
"%s: Re-configure the kernel and re-build the modules!\n",
card->devname);
}
release_hw(card);
wandev->state = WAN_UNCONFIGURED;
return err;
}
/* Reserve I/O region and schedule background task */
if(card->hw.type != SDLA_S514 && !card->wandev.piggyback)
if (!request_region(card->hw.port, card->hw.io_range,
wandev->name)) {
printk(KERN_WARNING "port 0x%04x busy\n", card->hw.port);
release_hw(card);
wandev->state = WAN_UNCONFIGURED;
return -EBUSY;
}
/* Only use the polling routine for the X25 protocol */
card->wandev.critical=0;
return 0;
}
/*==================================================================
* configure_s508_card
*
* For a S508 adapter, check for a possible configuration error in that
* we are loading an adapter in the same IO port as a previously loaded S508
* card.
*/
static int check_s508_conflicts (sdla_t* card,wandev_conf_t* conf, int *irq)
{
unsigned long smp_flags;
int i;
if (conf->ioport <= 0) {
printk(KERN_INFO
"%s: can't configure without I/O port address!\n",
card->wandev.name);
return -EINVAL;
}
if (conf->irq <= 0) {
printk(KERN_INFO "%s: can't configure without IRQ!\n",
card->wandev.name);
return -EINVAL;
}
if (test_bit(0,&card->configured))
return 0;
/* Check for already loaded card with the same IO port and IRQ
* If found, copy its hardware configuration and use its
* resources (i.e. piggybacking)
*/
for (i = 0; i < ncards; i++) {
sdla_t *nxt_card = &card_array[i];
/* Skip the current card ptr */
if (nxt_card == card)
continue;
/* Find a card that is already configured with the
* same IO Port */
if ((nxt_card->hw.type == SDLA_S508) &&
(nxt_card->hw.port == conf->ioport) &&
(nxt_card->next == NULL)){
/* We found a card the card that has same configuration
* as us. This means, that we must setup this card in
* piggibacking mode. However, only CHDLC and MPPP protocol
* support this setup */
if ((conf->config_id == WANCONFIG_CHDLC ||
conf->config_id == WANCONFIG_MPPP) &&
(nxt_card->wandev.config_id == WANCONFIG_CHDLC ||
nxt_card->wandev.config_id == WANCONFIG_MPPP)){
*irq = nxt_card->hw.irq;
memcpy(&card->hw, &nxt_card->hw, sizeof(sdlahw_t));
/* The master could already be running, we must
* set this as a critical area */
lock_adapter_irq(&nxt_card->wandev.lock, &smp_flags);
nxt_card->next = card;
card->next = nxt_card;
card->wandev.piggyback = WANOPT_YES;
/* We must initialise the piggiback spin lock here
* since isr will try to lock card->next if it
* exists */
spin_lock_init(&card->wandev.lock);
unlock_adapter_irq(&nxt_card->wandev.lock, &smp_flags);
break;
}else{
/* Trying to run piggibacking with a wrong protocol */
printk(KERN_INFO "%s: ERROR: Resource busy, ioport: 0x%x\n"
"%s: This protocol doesn't support\n"
"%s: multi-port operation!\n",
card->devname,nxt_card->hw.port,
card->devname,card->devname);
return -EEXIST;
}
}
}
/* Make sure I/O port region is available only if we are the
* master device. If we are running in piggybacking mode,
* we will use the resources of the master card. */
if (!card->wandev.piggyback) {
struct resource *rr =
request_region(conf->ioport, SDLA_MAXIORANGE, "sdlamain");
release_region(conf->ioport, SDLA_MAXIORANGE);
if (!rr) {
printk(KERN_INFO
"%s: I/O region 0x%X - 0x%X is in use!\n",
card->wandev.name, conf->ioport,
conf->ioport + SDLA_MAXIORANGE - 1);
return -EINVAL;
}
}
return 0;
}
/*==================================================================
* configure_s514_card
*
* For a S514 adapter, check for a possible configuration error in that
* we are loading an adapter in the same slot as a previously loaded S514
* card.
*/
static int check_s514_conflicts(sdla_t* card,wandev_conf_t* conf, int *irq)
{
unsigned long smp_flags;
int i;
if (test_bit(0,&card->configured))
return 0;
/* Check for already loaded card with the same IO port and IRQ
* If found, copy its hardware configuration and use its
* resources (i.e. piggybacking)
*/
for (i = 0; i < ncards; i ++) {
sdla_t* nxt_card = &card_array[i];
if(nxt_card == card)
continue;
if((nxt_card->hw.type == SDLA_S514) &&
(nxt_card->hw.S514_slot_no == conf->PCI_slot_no) &&
(nxt_card->hw.S514_cpu_no[0] == conf->S514_CPU_no[0])&&
(nxt_card->next == NULL)){
if ((conf->config_id == WANCONFIG_CHDLC ||
conf->config_id == WANCONFIG_MPPP) &&
(nxt_card->wandev.config_id == WANCONFIG_CHDLC ||
nxt_card->wandev.config_id == WANCONFIG_MPPP)){
*irq = nxt_card->hw.irq;
memcpy(&card->hw, &nxt_card->hw, sizeof(sdlahw_t));
/* The master could already be running, we must
* set this as a critical area */
lock_adapter_irq(&nxt_card->wandev.lock,&smp_flags);
nxt_card->next = card;
card->next = nxt_card;
card->wandev.piggyback = WANOPT_YES;
/* We must initialise the piggiback spin lock here
* since isr will try to lock card->next if it
* exists */
spin_lock_init(&card->wandev.lock);
unlock_adapter_irq(&nxt_card->wandev.lock,&smp_flags);
}else{
/* Trying to run piggibacking with a wrong protocol */
printk(KERN_INFO "%s: ERROR: Resource busy: CPU %c PCISLOT %i\n"
"%s: This protocol doesn't support\n"
"%s: multi-port operation!\n",
card->devname,
conf->S514_CPU_no[0],conf->PCI_slot_no,
card->devname,card->devname);
return -EEXIST;
}
}
}
return 0;
}
/*============================================================================
* Shut down WAN link driver.
* o shut down adapter hardware
* o release system resources.
*
* This function is called by the router when device is being unregistered or
* when it handles ROUTER_DOWN IOCTL.
*/
static int shutdown(struct wan_device* wandev)
{
sdla_t *card;
int err=0;
/* sanity checks */
if ((wandev == NULL) || (wandev->private == NULL)){
return -EFAULT;
}
if (wandev->state == WAN_UNCONFIGURED){
return 0;
}
card = wandev->private;
if (card->tty_opt){
if (card->tty_open){
printk(KERN_INFO
"%s: Shutdown Failed: TTY is still open\n",
card->devname);
return -EBUSY;
}
}
wandev->state = WAN_UNCONFIGURED;
set_bit(PERI_CRIT,(void*)&wandev->critical);
/* In case of piggibacking, make sure that
* we never try to shutdown both devices at the same
* time, because they depend on one another */
if (card->disable_comm){
card->disable_comm(card);
}
/* Release Resources */
release_hw(card);
/* only free the allocated I/O range if not an S514 adapter */
if (wandev->hw_opt[0] != SDLA_S514 && !card->configured){
release_region(card->hw.port, card->hw.io_range);
}
if (!card->configured){
memset(&card->hw, 0, sizeof(sdlahw_t));
if (card->next){
memset(&card->next->hw, 0, sizeof(sdlahw_t));
}
}
clear_bit(PERI_CRIT,(void*)&wandev->critical);
return err;
}
static void release_hw (sdla_t *card)
{
sdla_t *nxt_card;
/* Check if next device exists */
if (card->next){
nxt_card = card->next;
/* If next device is down then release resources */
if (nxt_card->wandev.state == WAN_UNCONFIGURED){
if (card->wandev.piggyback){
/* If this device is piggyback then use
* information of the master device
*/
printk(KERN_INFO "%s: Piggyback shutting down\n",card->devname);
sdla_down(&card->next->hw);
free_irq(card->wandev.irq, card->next);
card->configured = 0;
card->next->configured = 0;
card->wandev.piggyback = 0;
}else{
/* Master device shutting down */
printk(KERN_INFO "%s: Master shutting down\n",card->devname);
sdla_down(&card->hw);
free_irq(card->wandev.irq, card);
card->configured = 0;
card->next->configured = 0;
}
}else{
printk(KERN_INFO "%s: Device still running %i\n",
nxt_card->devname,nxt_card->wandev.state);
card->configured = 1;
}
}else{
printk(KERN_INFO "%s: Master shutting down\n",card->devname);
sdla_down(&card->hw);
free_irq(card->wandev.irq, card);
card->configured = 0;
}
return;
}
/*============================================================================
* Driver I/O control.
* o verify arguments
* o perform requested action
*
* This function is called when router handles one of the reserved user
* IOCTLs. Note that 'arg' stil points to user address space.
*/
static int ioctl(struct wan_device* wandev, unsigned cmd, unsigned long arg)
{
sdla_t* card;
int err;
/* sanity checks */
if ((wandev == NULL) || (wandev->private == NULL))
return -EFAULT;
if (wandev->state == WAN_UNCONFIGURED)
return -ENODEV;
card = wandev->private;
if(card->hw.type != SDLA_S514){
disable_irq(card->hw.irq);
}
if (test_bit(SEND_CRIT, (void*)&wandev->critical)) {
return -EAGAIN;
}
switch (cmd) {
case WANPIPE_DUMP:
err = ioctl_dump(wandev->private, (void*)arg);
break;
case WANPIPE_EXEC:
err = ioctl_exec(wandev->private, (void*)arg, cmd);
break;
default:
err = -EINVAL;
}
return err;
}
/****** Driver IOCTL Handlers ***********************************************/
/*============================================================================
* Dump adapter memory to user buffer.
* o verify request structure
* o copy request structure to kernel data space
* o verify length/offset
* o verify user buffer
* o copy adapter memory image to user buffer
*
* Note: when dumping memory, this routine switches curent dual-port memory
* vector, so care must be taken to avoid racing conditions.
*/
static int ioctl_dump (sdla_t* card, sdla_dump_t* u_dump)
{
sdla_dump_t dump;
unsigned winsize;
unsigned long oldvec; /* DPM window vector */
unsigned long smp_flags;
int err = 0;
if(copy_from_user((void*)&dump, (void*)u_dump, sizeof(sdla_dump_t)))
return -EFAULT;
if ((dump.magic != WANPIPE_MAGIC) ||
(dump.offset + dump.length > card->hw.memory))
return -EINVAL;
winsize = card->hw.dpmsize;
if(card->hw.type != SDLA_S514) {
lock_adapter_irq(&card->wandev.lock, &smp_flags);
oldvec = card->hw.vector;
while (dump.length) {
/* current offset */
unsigned pos = dump.offset % winsize;
/* current vector */
unsigned long vec = dump.offset - pos;
unsigned len = (dump.length > (winsize - pos)) ?
(winsize - pos) : dump.length;
/* relocate window */
if (sdla_mapmem(&card->hw, vec) != 0) {
err = -EIO;
break;
}
if(copy_to_user((void *)dump.ptr,
(u8 *)card->hw.dpmbase + pos, len)){
unlock_adapter_irq(&card->wandev.lock, &smp_flags);
return -EFAULT;
}
dump.length -= len;
dump.offset += len;
dump.ptr = (char*)dump.ptr + len;
}
sdla_mapmem(&card->hw, oldvec);/* restore DPM window position */
unlock_adapter_irq(&card->wandev.lock, &smp_flags);
}else {
if(copy_to_user((void *)dump.ptr,
(u8 *)card->hw.dpmbase + dump.offset, dump.length)){
return -EFAULT;
}
}
return err;
}
/*============================================================================
* Execute adapter firmware command.
* o verify request structure
* o copy request structure to kernel data space
* o call protocol-specific 'exec' function
*/
static int ioctl_exec (sdla_t* card, sdla_exec_t* u_exec, int cmd)
{
sdla_exec_t exec;
int err=0;
if (card->exec == NULL && cmd == WANPIPE_EXEC){
return -ENODEV;
}
if(copy_from_user((void*)&exec, (void*)u_exec, sizeof(sdla_exec_t)))
return -EFAULT;
if ((exec.magic != WANPIPE_MAGIC) || (exec.cmd == NULL))
return -EINVAL;
switch (cmd) {
case WANPIPE_EXEC:
err = card->exec(card, exec.cmd, exec.data);
break;
}
return err;
}
/******* Miscellaneous ******************************************************/
/*============================================================================
* SDLA Interrupt Service Routine.
* o acknowledge SDLA hardware interrupt.
* o call protocol-specific interrupt service routine, if any.
*/
STATIC irqreturn_t sdla_isr (int irq, void* dev_id, struct pt_regs *regs)
{
#define card ((sdla_t*)dev_id)
if(card->hw.type == SDLA_S514) { /* handle interrrupt on S514 */
u32 int_status;
unsigned char CPU_no = card->hw.S514_cpu_no[0];
unsigned char card_found_for_IRQ;
u8 IRQ_count = 0;
for(;;) {
read_S514_int_stat(&card->hw, &int_status);
/* check if the interrupt is for this device */
if(!((unsigned char)int_status &
(IRQ_CPU_A | IRQ_CPU_B)))
return IRQ_HANDLED;
/* if the IRQ is for both CPUs on the same adapter, */
/* then alter the interrupt status so as to handle */
/* one CPU at a time */
if(((unsigned char)int_status & (IRQ_CPU_A | IRQ_CPU_B))
== (IRQ_CPU_A | IRQ_CPU_B)) {
int_status &= (CPU_no == S514_CPU_A) ?
~IRQ_CPU_B : ~IRQ_CPU_A;
}
card_found_for_IRQ = 0;
/* check to see that the CPU number for this device */
/* corresponds to the interrupt status read */
switch (CPU_no) {
case S514_CPU_A:
if((unsigned char)int_status &
IRQ_CPU_A)
card_found_for_IRQ = 1;
break;
case S514_CPU_B:
if((unsigned char)int_status &
IRQ_CPU_B)
card_found_for_IRQ = 1;
break;
}
/* exit if the interrupt is for another CPU on the */
/* same IRQ */
if(!card_found_for_IRQ)
return IRQ_HANDLED;
if (!card ||
(card->wandev.state == WAN_UNCONFIGURED && !card->configured)){
printk(KERN_INFO
"Received IRQ %d for CPU #%c\n",
irq, CPU_no);
printk(KERN_INFO
"IRQ for unconfigured adapter\n");
S514_intack(&card->hw, int_status);
return IRQ_HANDLED;
}
if (card->in_isr) {
printk(KERN_INFO
"%s: interrupt re-entrancy on IRQ %d\n",
card->devname, card->wandev.irq);
S514_intack(&card->hw, int_status);
return IRQ_HANDLED;
}
spin_lock(&card->wandev.lock);
if (card->next){
spin_lock(&card->next->wandev.lock);
}
S514_intack(&card->hw, int_status);
if (card->isr)
card->isr(card);
if (card->next){
spin_unlock(&card->next->wandev.lock);
}
spin_unlock(&card->wandev.lock);
/* handle a maximum of two interrupts (one for each */
/* CPU on the adapter) before returning */
if((++ IRQ_count) == 2)
return IRQ_HANDLED;
}
}
else { /* handle interrupt on S508 adapter */
if (!card || ((card->wandev.state == WAN_UNCONFIGURED) && !card->configured))
return IRQ_HANDLED;
if (card->in_isr) {
printk(KERN_INFO
"%s: interrupt re-entrancy on IRQ %d!\n",
card->devname, card->wandev.irq);
return IRQ_HANDLED;
}
spin_lock(&card->wandev.lock);
if (card->next){
spin_lock(&card->next->wandev.lock);
}
sdla_intack(&card->hw);
if (card->isr)
card->isr(card);
if (card->next){
spin_unlock(&card->next->wandev.lock);
}
spin_unlock(&card->wandev.lock);
}
return IRQ_HANDLED;
#undef card
}
/*============================================================================
* This routine is called by the protocol-specific modules when network
* interface is being open. The only reason we need this, is because we
* have to call MOD_INC_USE_COUNT, but cannot include 'module.h' where it's
* defined more than once into the same kernel module.
*/
void wanpipe_open (sdla_t* card)
{
++card->open_cnt;
}
/*============================================================================
* This routine is called by the protocol-specific modules when network
* interface is being closed. The only reason we need this, is because we
* have to call MOD_DEC_USE_COUNT, but cannot include 'module.h' where it's
* defined more than once into the same kernel module.
*/
void wanpipe_close (sdla_t* card)
{
--card->open_cnt;
}
/*============================================================================
* Set WAN device state.
*/
void wanpipe_set_state (sdla_t* card, int state)
{
if (card->wandev.state != state) {
switch (state) {
case WAN_CONNECTED:
printk (KERN_INFO "%s: link connected!\n",
card->devname);
break;
case WAN_CONNECTING:
printk (KERN_INFO "%s: link connecting...\n",
card->devname);
break;
case WAN_DISCONNECTED:
printk (KERN_INFO "%s: link disconnected!\n",
card->devname);
break;
}
card->wandev.state = state;
}
card->state_tick = jiffies;
}
sdla_t * wanpipe_find_card (char *name)
{
int cnt;
for (cnt = 0; cnt < ncards; ++ cnt) {
sdla_t* card = &card_array[cnt];
if (!strcmp(card->devname,name))
return card;
}
return NULL;
}
sdla_t * wanpipe_find_card_num (int num)
{
if (num < 1 || num > ncards)
return NULL;
num--;
return &card_array[num];
}
/*
* @work_pointer: work_struct to be done;
* should already have PREPARE_WORK() or
* INIT_WORK() done on it by caller;
*/
void wanpipe_queue_work (struct work_struct *work_pointer)
{
if (test_and_set_bit(1, (void*)&wanpipe_bh_critical))
printk(KERN_INFO "CRITICAL IN QUEUING WORK\n");
queue_work(wanpipe_wq, work_pointer);
clear_bit(1,(void*)&wanpipe_bh_critical);
}
void wakeup_sk_bh(struct net_device *dev)
{
wanpipe_common_t *chan = dev->priv;
if (test_bit(0,&chan->common_critical))
return;
if (chan->sk && chan->tx_timer){
chan->tx_timer->expires=jiffies+1;
add_timer(chan->tx_timer);
}
}
int change_dev_flags(struct net_device *dev, unsigned flags)
{
struct ifreq if_info;
mm_segment_t fs = get_fs();
int err;
memset(&if_info, 0, sizeof(if_info));
strcpy(if_info.ifr_name, dev->name);
if_info.ifr_flags = flags;
set_fs(get_ds()); /* get user space block */
err = devinet_ioctl(SIOCSIFFLAGS, &if_info);
set_fs(fs);
return err;
}
unsigned long get_ip_address(struct net_device *dev, int option)
{
struct in_ifaddr *ifaddr;
struct in_device *in_dev;
unsigned long addr = 0;
rcu_read_lock();
if ((in_dev = __in_dev_get_rcu(dev)) == NULL){
goto out;
}
if ((ifaddr = in_dev->ifa_list)== NULL ){
goto out;
}
switch (option){
case WAN_LOCAL_IP:
addr = ifaddr->ifa_local;
break;
case WAN_POINTOPOINT_IP:
addr = ifaddr->ifa_address;
break;
case WAN_NETMASK_IP:
addr = ifaddr->ifa_mask;
break;
case WAN_BROADCAST_IP:
addr = ifaddr->ifa_broadcast;
break;
default:
break;
}
out:
rcu_read_unlock();
return addr;
}
void add_gateway(sdla_t *card, struct net_device *dev)
{
mm_segment_t oldfs;
struct rtentry route;
int res;
memset((char*)&route,0,sizeof(struct rtentry));
((struct sockaddr_in *)
&(route.rt_dst))->sin_addr.s_addr = 0;
((struct sockaddr_in *)
&(route.rt_dst))->sin_family = AF_INET;
((struct sockaddr_in *)
&(route.rt_genmask))->sin_addr.s_addr = 0;
((struct sockaddr_in *)
&(route.rt_genmask)) ->sin_family = AF_INET;
route.rt_flags = 0;
route.rt_dev = dev->name;
oldfs = get_fs();
set_fs(get_ds());
res = ip_rt_ioctl(SIOCADDRT,&route);
set_fs(oldfs);
if (res == 0){
printk(KERN_INFO "%s: Gateway added for %s\n",
card->devname,dev->name);
}
return;
}
MODULE_LICENSE("GPL");
/****** End *********************************************************/
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