path: root/drivers/net/rcpci45.c

/* 
**
**  RCpci45.c  
**
**
**
**  ---------------------------------------------------------------------
**  ---     Copyright (c) 1998, 1999, RedCreek Communications Inc.    ---
**  ---                   All rights reserved.                        ---
**  ---------------------------------------------------------------------
**
** Written by Pete Popov and Brian Moyle.
**
** Known Problems
** 
** None known at this time.
**
**  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., 675 Mass Ave, Cambridge, MA 02139, USA.
**
**   
**  Rasmus Andersen, December 2000: Converted to new PCI API and general
**  cleanup.
**
**  Pete Popov, January 11,99: Fixed a couple of 2.1.x problems 
**  (virt_to_bus() not called), tested it under 2.2pre5 (as a module), and 
**  added a #define(s) to enable the use of the same file for both, the 2.0.x 
**  kernels as well as the 2.1.x.
**
**  Ported to 2.1.x by Alan Cox 1998/12/9. 
**
**  Sometime in mid 1998, written by Pete Popov and Brian Moyle.
**
***************************************************************************/

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/in.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/timer.h>
#include <asm/irq.h>            /* For NR_IRQS only. */
#include <asm/bitops.h>
#include <asm/uaccess.h>



static char version[] __initdata =
"RedCreek Communications PCI linux driver version 2.03\n";

#define RC_LINUX_MODULE
#include "rclanmtl.h"
#include "rcif.h"

#define RUN_AT(x) (jiffies + (x))

#define NEW_MULTICAST

/* PCI/45 Configuration space values */
#define RC_PCI45_VENDOR_ID  0x4916
#define RC_PCI45_DEVICE_ID  0x1960

#define MAX_ETHER_SIZE        1520  
#define MAX_NMBR_RCV_BUFFERS    96
#define RC_POSTED_BUFFERS_LOW_MARK MAX_NMBR_RCV_BUFFERS-16
#define BD_SIZE 3           /* Bucket Descriptor size */
#define BD_LEN_OFFSET 2     /* Bucket Descriptor offset to length field */


/* RedCreek LAN device Target ID */
#define RC_LAN_TARGET_ID  0x10 
/* RedCreek's OSM default LAN receive Initiator */
#define DEFAULT_RECV_INIT_CONTEXT  0xA17  


static U32 DriverControlWord =  0;

static void rc_timer(unsigned long);

static int RCinit(struct net_device *);

static int RCopen(struct net_device *);
static int RC_xmit_packet(struct sk_buff *, struct net_device *);
static void RCinterrupt(int, void *, struct pt_regs *);
static int RCclose(struct net_device *dev);
static struct net_device_stats *RCget_stats(struct net_device *);
static int RCioctl(struct net_device *, struct ifreq *, int);
static int RCconfig(struct net_device *, struct ifmap *);
static void RCxmit_callback(U32, U16, PU32, struct net_device *);
static void RCrecv_callback(U32, U8, U32, PU32, struct net_device *);
static void RCreset_callback(U32, U32, U32, struct net_device *);
static void RCreboot_callback(U32, U32, U32, struct net_device *);
static int RC_allocate_and_post_buffers(struct net_device *, int);


static struct pci_device_id rcpci45_pci_table[] __devinitdata = {
	{ RC_PCI45_VENDOR_ID, RC_PCI45_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID, },
	{ }
};
MODULE_DEVICE_TABLE(pci, rcpci45_pci_table);

static void __exit rcpci45_remove_one(struct pci_dev *pdev)
{
	struct net_device *dev = pci_get_drvdata(pdev);
	PDPA pDpa = dev->priv;

        if (!dev) {
                printk (KERN_ERR "(rcpci45 driver:) remove non-existent device\n");
                return;
        }

	dprintk("remove_one: IOP reset: 0x%x\n", RCResetIOP(dev));

	/* RAA Inspired by starfire.c and yellowfin.c we keep these
	 * here. */
  	unregister_netdev(dev);
	free_irq(dev->irq, dev); 
	iounmap((void *)dev->base_addr);
	pci_release_regions(pdev);
	kfree(pDpa->PLanApiPA);
	kfree(pDpa->pPab);
	kfree(pDpa);
	kfree(dev);
	pci_set_drvdata(pdev, NULL);
}

static int RCinit(struct net_device *dev)
{
    dev->open = &RCopen;
    dev->hard_start_xmit = &RC_xmit_packet;
    dev->stop = &RCclose;
    dev->get_stats = &RCget_stats;
    dev->do_ioctl = &RCioctl;
    dev->set_config = &RCconfig;
    return 0;
}

static int rcpci45_init_one(struct pci_dev *pdev, 
			    const struct pci_device_id *ent)
{
    unsigned long *vaddr;
    PDPA pDpa;
    int error;
    static int card_idx = -1;
    struct net_device *dev;
    unsigned long pci_start, pci_len;

    card_idx++;

    /* 
     * Allocate and fill new device structure. 
     * We need enough for struct net_device plus DPA plus the LAN API private
     * area, which requires a minimum of 16KB.  The top of the allocated
     * area will be assigned to struct net_device; the next chunk will be
     * assigned to DPA; and finally, the rest will be assigned to the
     * the LAN API layer.
     */

    dev = init_etherdev(NULL, sizeof(*pDpa));
    if (!dev) {
	printk(KERN_ERR "(rcpci45 driver:) unable to allocate in init_etherdev\n");
        error = -ENOMEM;
	goto err_out;
    }

    error = pci_enable_device(pdev);
    if (error) {
        printk(KERN_ERR "(rcpci45 driver:) %d: unable to enable pci device, aborting\n",card_idx);
	goto err_out;
    }
    error = -ENOMEM;
    pci_start = pci_resource_start(pdev,0);
    pci_len = pci_resource_len(pdev,0);

    pci_set_drvdata(pdev, dev);
    
    pDpa = dev->priv;
    pDpa->id = card_idx;
    pDpa->pci_addr = pci_start;

    if (!pci_start || !(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
	printk(KERN_ERR "(rcpci45 driver:) No PCI memory resources! Aborting.\n");
	error = -EBUSY;
	goto err_out_free_dev;
    }    

    /*
     * Save the starting address of the LAN API private area.  We'll
     * pass that to RCInitI2OMsgLayer().
     */
    /* RAA FIXME: This size should be a #define somewhere after I
     * clear up some questions: What flags are neeeded in the alloc below
     * and what needs to be done before the memarea is long word aligned?
     * (Look in old code for an approach.) (Also note that the 16K below
     * is substantially less than the 32K allocated before (even though
     * some of the spacce was used for data structures.) */
    pDpa->msgbuf = kmalloc(16384, GFP_KERNEL);
    if (!pDpa->msgbuf) {
        printk(KERN_ERR "(rcpci45 driver:) Could not allocate %d byte memory for the private msgbuf!\n", 16384); /* RAA FIXME not hardcoded! */
	goto err_out_free_dev;
    }
    pDpa->PLanApiPA = (void *)(((long)pDpa->msgbuf + 0xff) & ~0xff);

    dprintk("pDpa->PLanApiPA = 0x%x\n", (uint)pDpa->PLanApiPA);
    
    /* The adapter is accessible through memory-access read/write, not
     * I/O read/write.  Thus, we need to map it to some virtual address
     * area in order to access the registers as normal memory.
     */
    error = pci_request_regions(pdev, dev->name);
    if (error)
    	goto err_out_free_msgbuf;

    vaddr = (ulong *) ioremap (pci_start, pci_len); 
    if (!vaddr) {
        printk(KERN_ERR "(rcpci45 driver:) Unable to remap address range from %lu to %lu\n", pci_start, pci_start+pci_len);
	goto err_out_free_region;
    }

    dprintk("rcpci45_init_one: 0x%x, priv = 0x%x, vaddr = 0x%x\n", 
           (uint)dev, (uint)dev->priv, (uint)vaddr);
    dev->base_addr = (unsigned long)vaddr;
    dev->irq = pdev->irq;

    dev->init = &RCinit;

    return 0; /* success */

 err_out_free_region:
    pci_release_regions(pdev);
 err_out_free_msgbuf:
    kfree(pDpa->msgbuf);
 err_out_free_dev:
    unregister_netdev(dev);
    kfree(dev);
 err_out:
    card_idx--;
    return error;
}

static struct pci_driver rcpci45_driver = {
	name: "rcpci45",
	id_table: rcpci45_pci_table,
	probe: rcpci45_init_one,
	remove: rcpci45_remove_one,
};

static int __init rcpci_init_module(void)
{
	int rc = pci_module_init(&rcpci45_driver);

	if (!rc)
		printk(KERN_INFO "%s",version);
	return rc;
}

static int
RCopen(struct net_device *dev)
{
    int post_buffers = MAX_NMBR_RCV_BUFFERS;
    PDPA pDpa = dev->priv;
    int count = 0;
    int requested = 0;
    int error;

    dprintk("(rcpci45 driver:) RCopen\n");

    /* Request a shared interrupt line. */
    error=request_irq(dev->irq, RCinterrupt, SA_SHIRQ, dev->name, dev);
    if (error) {
        printk(KERN_ERR "(rcpci45 driver:) %s: unable to get IRQ %d\n", dev->name, dev->irq );
	goto err_out;
    }

    error = RCInitI2OMsgLayer(dev, (PFNTXCALLBACK)RCxmit_callback,
			      (PFNRXCALLBACK)RCrecv_callback,
			      (PFNCALLBACK)RCreboot_callback);
    if (error) {
        printk(KERN_ERR "(rcpci45 driver:) Unable to initialize msg layer\n");
	goto err_out_free_irq;
    }
    if ( (error=RCGetMAC(dev, NULL)) ) {
        printk(KERN_ERR "(rcpci45 driver:) Unable to get adapter MAC\n");
	goto err_out_free_irq;
    }

    DriverControlWord |= WARM_REBOOT_CAPABLE;
    RCReportDriverCapability(dev, DriverControlWord);

    printk(KERN_INFO "%s: RedCreek Communications IPSEC VPN adapter\n",
        dev->name);


    /* RAA: Old RCopen starts here */
    RCEnableI2OInterrupts(dev);

    /* RAA Hmm, how does the comment below jibe with the newly imported
     * code above? A FIXME!!*/
    if (pDpa->nexus) {
        /* This is not the first time RCopen is called.  Thus,
         * the interface was previously opened and later closed
         * by RCclose().  RCclose() does a Shutdown; to wake up
         * the adapter, a reset is mandatory before we can post
         * receive buffers.  However, if the adapter initiated 
         * a reboot while the interface was closed -- and interrupts
         * were turned off -- we need will need to reinitialize
         * the adapter, rather than simply waking it up.  
         */
	dprintk(KERN_INFO "Waking up adapter...\n");
        RCResetLANCard(dev,0,0,0);
    } else
        pDpa->nexus = 1;

    while(post_buffers) {
        if (post_buffers > MAX_NMBR_POST_BUFFERS_PER_MSG)
            requested = MAX_NMBR_POST_BUFFERS_PER_MSG;
        else
            requested = post_buffers;
        count = RC_allocate_and_post_buffers(dev, requested);

        if ( count < requested )
        {
            /*
             * Check to see if we were able to post any buffers at all.
             */
            if (post_buffers == MAX_NMBR_RCV_BUFFERS) {
                printk(KERN_ERR "(rcpci45 driver:) Error RCopen: not able to allocate any buffers\r\n");
                return(-ENOMEM);                    
            }
            printk(KERN_WARNING "(rcpci45 driver:) Warning RCopen: not able to allocate all requested buffers\r\n");
            break;            /* we'll try to post more buffers later */
        } else
            post_buffers -= count;
    }
    pDpa->numOutRcvBuffers = MAX_NMBR_RCV_BUFFERS - post_buffers;
    pDpa->shutdown = 0;        /* just in case */
    dprintk("RCopen: posted %d buffers\n", (uint)pDpa->numOutRcvBuffers);
    MOD_INC_USE_COUNT;
    netif_start_queue(dev);
    return 0;

 err_out_free_irq:
    free_irq(dev->irq, dev);
 err_out:
    return error;
}

static int
RC_xmit_packet(struct sk_buff *skb, struct net_device *dev)
{

    PDPA pDpa = dev->priv;
    singleTCB tcb;
    psingleTCB ptcb = &tcb;
    RC_RETURN status = 0;
   
    netif_stop_queue(dev);
     
    if (pDpa->shutdown || pDpa->reboot) {
            dprintk("RC_xmit_packet: tbusy!\n");
            return 1;
    }
      
    /*
     * The user is free to reuse the TCB after RCI2OSendPacket() returns, since
     * the function copies the necessary info into its own private space.  Thus,
     * our TCB can be a local structure.  The skb, on the other hand, will be
     * freed up in our interrupt handler.
     */

    ptcb->bcount = 1;

    /* 
     * we'll get the context when the adapter interrupts us to tell us that
     * the transmission is done. At that time, we can free skb.
     */
    ptcb->b.context = (U32)skb;    
    ptcb->b.scount = 1;
    ptcb->b.size = skb->len;
    ptcb->b.addr = virt_to_bus((void *)skb->data);

    dprintk("RC xmit: skb = 0x%x, pDpa = 0x%x, id = %d, ptcb = 0x%x\n", 
           (uint)skb, (uint)pDpa, (uint)pDpa->id, (uint)ptcb);
    if ( (status = RCI2OSendPacket(dev, (U32)NULL, (PRCTCB)ptcb))
         != RC_RTN_NO_ERROR) {
        dprintk("RC send error 0x%x\n", (uint)status);
        return 1;
    } else {
        dev->trans_start = jiffies;
        netif_wake_queue(dev);
    }
    /*
     * That's it!
     */
    return 0;
}

/*
 * RCxmit_callback()
 *
 * The transmit callback routine. It's called by RCProcI2OMsgQ()
 * because the adapter is done with one or more transmit buffers and
 * it's returning them to us, or we asked the adapter to return the
 * outstanding transmit buffers by calling RCResetLANCard() with 
 * RC_RESOURCE_RETURN_PEND_TX_BUFFERS flag. 
 * All we need to do is free the buffers.
 */
static void 
RCxmit_callback(U32 Status, 
                U16 PcktCount, 
                PU32 BufferContext, 
                struct net_device *dev)
{
    struct sk_buff *skb;
    PDPA pDpa = dev->priv;

    if (!pDpa) {
            printk(KERN_ERR "(rcpci45 driver:) Fatal error: xmit callback, !pDpa\n");
            return;
    }

/*      dprintk("xmit_callback: Status = 0x%x\n", (uint)Status); */
    if (Status != I2O_REPLY_STATUS_SUCCESS)
            dprintk("xmit_callback: Status = 0x%x\n", (uint)Status);
    if (pDpa->shutdown || pDpa->reboot)
            dprintk("xmit callback: shutdown||reboot\n");

    dprintk("xmit_callback: PcktCount = %d, BC = 0x%x\n", 
	   (uint)PcktCount, (uint)BufferContext);

    while (PcktCount--) {
            skb = (struct sk_buff *)(BufferContext[0]);
            dprintk("skb = 0x%x\n", (uint)skb);
            BufferContext++;
            dev_kfree_skb_irq(skb);
    }
    netif_wake_queue(dev);
}

static void
RCreset_callback(U32 Status, U32 p1, U32 p2, struct net_device *dev)
{
    PDPA pDpa = dev->priv;
     
    dprintk("RCreset_callback Status 0x%x\n", (uint)Status);
    /*
     * Check to see why we were called.
     */
    if (pDpa->shutdown) {
        printk(KERN_INFO "(rcpci45 driver:) Shutting down interface\n");
        pDpa->shutdown = 0;
        pDpa->reboot = 0;
        MOD_DEC_USE_COUNT; 
    } else if (pDpa->reboot) {
        printk(KERN_INFO "(rcpci45 driver:) reboot, shutdown adapter\n");
        /*
         * We don't set any of the flags in RCShutdownLANCard()
         * and we don't pass a callback routine to it.
         * The adapter will have already initiated the reboot by
         * the time the function returns.
         */
        RCDisableI2OInterrupts(dev);
        RCShutdownLANCard(dev,0,0,0);
        printk(KERN_INFO "(rcpci45 driver:) scheduling timer...\n");
        init_timer(&pDpa->timer);
        pDpa->timer.expires = RUN_AT((40*HZ)/10); /* 4 sec. */
        pDpa->timer.data = (unsigned long)dev;
        pDpa->timer.function = &rc_timer;    /* timer handler */
        add_timer(&pDpa->timer);
    }
}

static void
RCreboot_callback(U32 Status, U32 p1, U32 p2, struct net_device *dev)
{
    PDPA pDpa = dev->priv;
    
    dprintk("RCreboot: rcv buffers outstanding = %d\n", 
           (uint)pDpa->numOutRcvBuffers);

    if (pDpa->shutdown) {
        printk(KERN_INFO "(rcpci45 driver:) skipping reboot sequence -- shutdown already initiated\n");
        return;
    }
    pDpa->reboot = 1;
    /*
     * OK, we reset the adapter and ask it to return all
     * outstanding transmit buffers as well as the posted
     * receive buffers.  When the adapter is done returning
     * those buffers, it will call our RCreset_callback() 
     * routine.  In that routine, we'll call RCShutdownLANCard()
     * to tell the adapter that it's OK to start the reboot and
     * schedule a timer callback routine to execute 3 seconds 
     * later; this routine will reinitialize the adapter at that time.
     */
    RCResetLANCard(dev, RC_RESOURCE_RETURN_POSTED_RX_BUCKETS | 
                   RC_RESOURCE_RETURN_PEND_TX_BUFFERS,0,
                   (PFNCALLBACK)RCreset_callback);
}


int broadcast_packet(unsigned char * address)
{
    int i;
    for (i=0; i<6; i++)
        if (address[i] != 0xff) return 0;

    return 1;
}

/*
 * RCrecv_callback()
 * 
 * The receive packet callback routine.  This is called by
 * RCProcI2OMsgQ() after the adapter posts buffers which have been
 * filled (one ethernet packet per buffer).
 */
static void
RCrecv_callback(U32  Status, 
                U8   PktCount, 
                U32  BucketsRemain, 
                PU32 PacketDescBlock, 
                struct net_device *dev)
{

    U32 len, count;
    PDPA pDpa = dev->priv;
    struct sk_buff *skb;
    singleTCB tcb;
    psingleTCB ptcb = &tcb;


    ptcb->bcount = 1;
    
    dprintk("RCrecv_callback: 0x%x, 0x%x, 0x%x\n",
	   (uint)PktCount, (uint)BucketsRemain, (uint)PacketDescBlock);

    if ((pDpa->shutdown || pDpa->reboot) && !Status)
            dprintk("shutdown||reboot && !Status: PktCount = %d\n",PktCount);
    
    if ( (Status != I2O_REPLY_STATUS_SUCCESS) || pDpa->shutdown)
    {
            /*
             * Free whatever buffers the adapter returned, but don't
             * pass them to the kernel.
             */
	    
	    if (!pDpa->shutdown && !pDpa->reboot)
                    printk(KERN_INFO "(rcpci45 driver:) RCrecv error: status = 0x%x\n", (uint)Status);
                else
			dprintk("Returning %d buffers, status = 0x%x\n", 
                           PktCount, (uint)Status);
            /*
             * TO DO: check the nature of the failure and put the adapter in
             * failed mode if it's a hard failure.  Send a reset to the adapter
             * and free all outstanding memory.
             */
            if (Status == I2O_REPLY_STATUS_ABORT_NO_DATA_TRANSFER)
                dprintk("RCrecv status ABORT NO DATA TRANSFER\n");

            /* check for reset status: I2O_REPLY_STATUS_ABORT_NO_DATA_TRANSFER */ 
            if (PacketDescBlock)
            {
                while(PktCount--)
                {
                    skb = (struct sk_buff *)PacketDescBlock[0];
                    dprintk("free skb 0x%p\n", skb);
                    dev_kfree_skb (skb);
                    pDpa->numOutRcvBuffers--;
                    PacketDescBlock += BD_SIZE; /* point to next context field */
                }
            }
            return;
        }
        else
        {
            while(PktCount--)
            {
                skb = (struct sk_buff *)PacketDescBlock[0];
                if (pDpa->shutdown)
			dprintk("shutdown: skb=0x%x\n", (uint)skb);

                dprintk("skb = 0x%x: 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x\n", (uint)skb,
                       (uint)skb->data[0], (uint)skb->data[1], (uint)skb->data[2],
                       (uint)skb->data[3], (uint)skb->data[4], (uint)skb->data[5]);

#ifdef PROMISCUOUS_BY_DEFAULT   /* early 2.x firmware */
                if ( (memcmp(dev->dev_addr, skb->data, 6)) &&
                     (!broadcast_packet(skb->data)))
                {
                    /*
                     * Re-post the buffer to the adapter.  Since the adapter usually
                     * return 1 to 2 receive buffers at a time, it's not too inefficient
                     * post one buffer at a time but ... may be that should be 
                     * optimized at some point.
                     */
                    ptcb->b.context = (U32)skb;    
                    ptcb->b.scount = 1;
                    ptcb->b.size = MAX_ETHER_SIZE;
                    ptcb->b.addr = virt_to_bus((void *)skb->data);

                    if ( RCPostRecvBuffers(dev, (PRCTCB)ptcb ) != RC_RTN_NO_ERROR)
                    {
                        printk(KERN_WARNING "(rcpci45 driver:) RCrecv_callback: post buffer failed!\n");
                        dev_kfree_skb (skb);
                    }
                    else
                        pDpa->numOutRcvBuffers++;
                }
                else
#endif /* PROMISCUOUS_BY_DEFAULT */
                {
                    len = PacketDescBlock[2];
                    skb->dev = dev;
                    skb_put( skb, len ); /* adjust length and tail */
                    skb->protocol = eth_type_trans(skb, dev);
                    netif_rx(skb);    /* send the packet to the kernel */
                    dev->last_rx = jiffies;
                }
                pDpa->numOutRcvBuffers--;
                PacketDescBlock += BD_SIZE; /* point to next context field */
            }
        } 
    
        /*
         * Replenish the posted receive buffers. 
         * DO NOT replenish buffers if the driver has already
         * initiated a reboot or shutdown!
         */

        if (!pDpa->shutdown && !pDpa->reboot)
        {
            count = RC_allocate_and_post_buffers(dev, 
                                                 MAX_NMBR_RCV_BUFFERS-pDpa->numOutRcvBuffers);
            pDpa->numOutRcvBuffers += count;
        }

}

/*
 * RCinterrupt()
 * 
 * Interrupt handler. 
 * This routine sets up a couple of pointers and calls
 * RCProcI2OMsgQ(), which in turn process the message and
 * calls one of our callback functions.
 */
static void 
RCinterrupt(int irq, void *dev_id, struct pt_regs *regs)
{

    PDPA pDpa;
    struct net_device *dev = dev_id;

    pDpa = dev->priv;
     
    if (pDpa->shutdown)
        dprintk("shutdown: service irq\n");

    dprintk("RC irq: pDpa = 0x%x, dev = 0x%x, id = %d\n", 
           (uint)pDpa, (uint)dev, (uint)pDpa->id);
    dprintk("dev = 0x%x\n", (uint)dev);

    RCProcI2OMsgQ(dev);
}


#define REBOOT_REINIT_RETRY_LIMIT 4
static void rc_timer(unsigned long data)
{
    struct net_device *dev = (struct net_device *)data;
    PDPA pDpa = dev->priv;
    int init_status;
    static int retry;
    int post_buffers = MAX_NMBR_RCV_BUFFERS;
    int count = 0;
    int requested = 0;

    if (pDpa->reboot)
    {
        init_status = RCInitI2OMsgLayer(dev, (PFNTXCALLBACK)RCxmit_callback,
					(PFNRXCALLBACK)RCrecv_callback,
					(PFNCALLBACK)RCreboot_callback);

        switch(init_status)
        {
        case RC_RTN_NO_ERROR:
 
            pDpa->reboot = 0;
            pDpa->shutdown = 0;        /* just in case */
            RCReportDriverCapability(dev, DriverControlWord);
            RCEnableI2OInterrupts(dev);

            if (dev->flags & IFF_UP)
            {
                while(post_buffers)
                {
                    if (post_buffers > MAX_NMBR_POST_BUFFERS_PER_MSG)
                        requested = MAX_NMBR_POST_BUFFERS_PER_MSG;
                    else
                        requested = post_buffers;
                    count = RC_allocate_and_post_buffers(dev, requested);
                    post_buffers -= count;
                    if ( count < requested )
                        break;
                }
                pDpa->numOutRcvBuffers = 
                    MAX_NMBR_RCV_BUFFERS - post_buffers;
                dprintk("rc: posted %d buffers \r\n", 
                       (uint)pDpa->numOutRcvBuffers);
            }
            dprintk("Initialization done.\n");
            netif_wake_queue(dev);
            retry=0;
            return;
        case RC_RTN_FREE_Q_EMPTY:
            retry++;
            printk(KERN_WARNING "(rcpci45 driver:) inbound free q empty\n");
            break;
        default:
            retry++;
            printk(KERN_WARNING "(rcpci45 driver:) bad status after reboot: %d\n", init_status);    
            break;
        }

        if (retry > REBOOT_REINIT_RETRY_LIMIT)
        {
            printk(KERN_WARNING "(rcpci45 driver:) unable to reinitialize adapter after reboot\n");
            printk(KERN_WARNING "(rcpci45 driver:) decrementing driver and closing interface\n");
            RCDisableI2OInterrupts(dev);
            dev->flags &= ~IFF_UP;
            MOD_DEC_USE_COUNT; 
        }
        else
        {
            printk(KERN_INFO "(rcpci45 driver:) rescheduling timer...\n");
            init_timer(&pDpa->timer);
            pDpa->timer.expires = RUN_AT((40*HZ)/10); /* 3 sec. */
            pDpa->timer.data = (unsigned long)dev;
            pDpa->timer.function = &rc_timer;    /* timer handler */
            add_timer(&pDpa->timer);
        }
    }
    else
        printk(KERN_WARNING "(rcpci45 driver:) timer??\n");
}

static int
RCclose(struct net_device *dev)
{
    PDPA pDpa = dev->priv;

    netif_stop_queue(dev);
    
    dprintk("RCclose\r\n");

    if (pDpa->reboot)
    {
        printk(KERN_INFO "(rcpci45 driver:) skipping reset -- adapter already in reboot mode\n");
        dev->flags &= ~IFF_UP;
        pDpa->shutdown = 1;
        return 0;
    }
    dprintk("receive buffers outstanding: %d\n", (uint)pDpa->numOutRcvBuffers);

    pDpa->shutdown = 1;

    /*
     * We can't allow the driver to be unloaded until the adapter returns
     * all posted receive buffers.  It doesn't hurt to tell the adapter
     * to return all posted receive buffers and outstanding xmit buffers,
     * even if there are none.
     */

    RCShutdownLANCard(dev, RC_RESOURCE_RETURN_POSTED_RX_BUCKETS | 
                      RC_RESOURCE_RETURN_PEND_TX_BUFFERS,0,
                      (PFNCALLBACK)RCreset_callback);

    dev->flags &= ~IFF_UP;
    return 0;
}

static struct net_device_stats *
RCget_stats(struct net_device *dev)
{
    RCLINKSTATS    RCstats;
   
    PDPA pDpa = dev->priv;

    if (!pDpa)
    {
	dprintk("RCget_stats: !pDpa\n");
        return 0;
    }
    else if (!(dev->flags & IFF_UP))    
    {
	dprintk("RCget_stats: device down\n");
        return 0;
    }

    memset(&RCstats, 0, sizeof(RCLINKSTATS));
    if ( (RCGetLinkStatistics(dev, &RCstats, (void *)0)) == RC_RTN_NO_ERROR )
    {
	dprintk("TX_good 0x%x\n", (uint)RCstats.TX_good);
        dprintk("TX_maxcol 0x%x\n", (uint)RCstats.TX_maxcol);
        dprintk("TX_latecol 0x%x\n", (uint)RCstats.TX_latecol);
        dprintk("TX_urun 0x%x\n", (uint)RCstats.TX_urun);
        dprintk("TX_crs 0x%x\n", (uint)RCstats.TX_crs);
        dprintk("TX_def 0x%x\n", (uint)RCstats.TX_def);
        dprintk("TX_singlecol 0x%x\n", (uint)RCstats.TX_singlecol);
        dprintk("TX_multcol 0x%x\n", (uint)RCstats.TX_multcol);
        dprintk("TX_totcol 0x%x\n", (uint)RCstats.TX_totcol);
		 
        dprintk("Rcv_good 0x%x\n", (uint)RCstats.Rcv_good);
        dprintk("Rcv_CRCerr 0x%x\n", (uint)RCstats.Rcv_CRCerr);
        dprintk("Rcv_alignerr 0x%x\n", (uint)RCstats.Rcv_alignerr);
        dprintk("Rcv_reserr 0x%x\n", (uint)RCstats.Rcv_reserr);
        dprintk("Rcv_orun 0x%x\n", (uint)RCstats.Rcv_orun);
        dprintk("Rcv_cdt 0x%x\n", (uint)RCstats.Rcv_cdt);
        dprintk("Rcv_runt 0x%x\n", (uint)RCstats.Rcv_runt);

        pDpa->stats.rx_packets = RCstats.Rcv_good; /* total packets received    */
        pDpa->stats.tx_packets = RCstats.TX_good; /* total packets transmitted    */

        pDpa->stats.rx_errors = 
            RCstats.Rcv_CRCerr +
            RCstats.Rcv_alignerr + 
            RCstats.Rcv_reserr + 
            RCstats.Rcv_orun + 
            RCstats.Rcv_cdt + 
            RCstats.Rcv_runt; /* bad packets received        */

        pDpa->stats.tx_errors = 
            RCstats.TX_urun + 
            RCstats.TX_crs + 
            RCstats.TX_def + 
            RCstats.TX_totcol; /* packet transmit problems    */

        /*
         * This needs improvement.
         */
        pDpa->stats.rx_dropped = 0;        /* no space in linux buffers    */
        pDpa->stats.tx_dropped = 0;        /* no space available in linux    */
        pDpa->stats.multicast = 0;        /* multicast packets received    */
        pDpa->stats.collisions = RCstats.TX_totcol;

        /* detailed rx_errors: */
        pDpa->stats.rx_length_errors = 0;
        pDpa->stats.rx_over_errors = RCstats.Rcv_orun; /* receiver ring buff overflow    */
        pDpa->stats.rx_crc_errors = RCstats.Rcv_CRCerr;    /* recved pkt with crc error    */
        pDpa->stats.rx_frame_errors = 0; /* recv'd frame alignment error */
        pDpa->stats.rx_fifo_errors = 0; /* recv'r fifo overrun        */
        pDpa->stats.rx_missed_errors = 0; /* receiver missed packet    */

        /* detailed tx_errors */
        pDpa->stats.tx_aborted_errors = 0;
        pDpa->stats.tx_carrier_errors = 0;
        pDpa->stats.tx_fifo_errors = 0;
        pDpa->stats.tx_heartbeat_errors = 0;
        pDpa->stats.tx_window_errors = 0;

        return ((struct net_device_stats *)&(pDpa->stats));
    }
    return 0;
}

static int RCioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
    RCuser_struct RCuser;
    PDPA pDpa = dev->priv;

    dprintk("RCioctl: cmd = 0x%x\n", cmd);
 
    if(!capable(CAP_NET_ADMIN))
    	return -EPERM;
    	
    switch (cmd)  {
 
    case RCU_PROTOCOL_REV:
        /*
         * Assign user protocol revision, to tell user-level
         * controller program whether or not it's in sync.
         */
        rq->ifr_ifru.ifru_data = (caddr_t) USER_PROTOCOL_REV;
        break;
  

    case RCU_COMMAND:
    {
        if(copy_from_user(&RCuser, rq->ifr_data, sizeof(RCuser)))
             return -EFAULT;
        
        dprintk("RCioctl: RCuser_cmd = 0x%x\n", RCuser.cmd);
  
        switch(RCuser.cmd)
        {
        case RCUC_GETFWVER:
            printk(KERN_INFO "(rcpci45 driver:) RC GETFWVER\n");
            RCUD_GETFWVER = &RCuser.RCUS_GETFWVER;
            RCGetFirmwareVer(dev, (PU8) &RCUD_GETFWVER->FirmString, NULL);
            break;
        case RCUC_GETINFO:
            printk(KERN_INFO "(rcpci45 driver:) RC GETINFO\n");
            RCUD_GETINFO = &RCuser.RCUS_GETINFO;
            RCUD_GETINFO -> mem_start = dev->base_addr;
	    RCUD_GETINFO -> mem_end = dev->base_addr + pDpa->pci_addr_len;
	    RCUD_GETINFO -> base_addr = pDpa->pci_addr;  
            RCUD_GETINFO -> irq = dev->irq;
            break;
        case RCUC_GETIPANDMASK:
            printk(KERN_INFO "(rcpci45 driver:) RC GETIPANDMASK\n");
            RCUD_GETIPANDMASK = &RCuser.RCUS_GETIPANDMASK;
            RCGetRavlinIPandMask(dev, (PU32) &RCUD_GETIPANDMASK->IpAddr,
                                 (PU32) &RCUD_GETIPANDMASK->NetMask, NULL);
            break;
        case RCUC_GETLINKSTATISTICS:
            printk(KERN_INFO "(rcpci45 driver:) RC GETLINKSTATISTICS\n");
            RCUD_GETLINKSTATISTICS = &RCuser.RCUS_GETLINKSTATISTICS;
            RCGetLinkStatistics(dev, (P_RCLINKSTATS) &RCUD_GETLINKSTATISTICS->StatsReturn, NULL);
            break;
        case RCUC_GETLINKSTATUS:
            printk(KERN_INFO "(rcpci45 driver:) RC GETLINKSTATUS\n");
            RCUD_GETLINKSTATUS = &RCuser.RCUS_GETLINKSTATUS;
            RCGetLinkStatus(dev, (PU32) &RCUD_GETLINKSTATUS->ReturnStatus, NULL);
            break;
        case RCUC_GETMAC:
            printk(KERN_INFO "(rcpci45 driver:) RC GETMAC\n");
            RCUD_GETMAC = &RCuser.RCUS_GETMAC;
            RCGetMAC(dev, NULL);
            break;
        case RCUC_GETPROM:
            printk(KERN_INFO "(rcpci45 driver:) RC GETPROM\n");
            RCUD_GETPROM = &RCuser.RCUS_GETPROM;
            RCGetPromiscuousMode(dev, (PU32) &RCUD_GETPROM->PromMode, NULL);
            break;
        case RCUC_GETBROADCAST:
            printk(KERN_INFO "(rcpci45 driver:) RC GETBROADCAST\n");
            RCUD_GETBROADCAST = &RCuser.RCUS_GETBROADCAST;
            RCGetBroadcastMode(dev, (PU32) &RCUD_GETBROADCAST->BroadcastMode, NULL);
            break;
        case RCUC_GETSPEED:
            printk(KERN_INFO "(rcpci45 driver:) RC GETSPEED\n");
            if (!(dev->flags & IFF_UP))    
            {
                printk(KERN_ERR "(rcpci45 driver:) RCioctl, GETSPEED error: interface down\n");
                return -ENODATA;
            }
            RCUD_GETSPEED = &RCuser.RCUS_GETSPEED;
            RCGetLinkSpeed(dev, (PU32) &RCUD_GETSPEED->LinkSpeedCode, NULL);
            printk(KERN_INFO "(rcpci45 driver:) RC speed = 0x%u\n", RCUD_GETSPEED->LinkSpeedCode);
            break;
        case RCUC_SETIPANDMASK:
            printk(KERN_INFO "(rcpci45 driver:) RC SETIPANDMASK\n");
            RCUD_SETIPANDMASK = &RCuser.RCUS_SETIPANDMASK;
            printk (KERN_INFO "(rcpci45 driver:) RC New IP Addr = %d.%d.%d.%d, ", (U8) ((RCUD_SETIPANDMASK->IpAddr) & 0xff),
                    (U8) ((RCUD_SETIPANDMASK->IpAddr >>  8) & 0xff),
                    (U8) ((RCUD_SETIPANDMASK->IpAddr >> 16) & 0xff),
                    (U8) ((RCUD_SETIPANDMASK->IpAddr >> 24) & 0xff));
            printk (KERN_INFO "(rcpci45 driver:) RC New Mask = %d.%d.%d.%d\n", (U8) ((RCUD_SETIPANDMASK->NetMask) & 0xff),
                    (U8) ((RCUD_SETIPANDMASK->NetMask >>  8) & 0xff),
                    (U8) ((RCUD_SETIPANDMASK->NetMask >> 16) & 0xff),
                    (U8) ((RCUD_SETIPANDMASK->NetMask >> 24) & 0xff));
            RCSetRavlinIPandMask(dev, (U32) RCUD_SETIPANDMASK->IpAddr,
                                 (U32) RCUD_SETIPANDMASK->NetMask);
            break;
        case RCUC_SETMAC:
            printk(KERN_INFO "(rcpci45 driver:) RC SETMAC\n");
            RCUD_SETMAC = &RCuser.RCUS_SETMAC;
            printk (KERN_INFO "(rcpci45 driver:) RC New MAC addr = %02X:%02X:%02X:%02X:%02X:%02X\n",
                    (U8) (RCUD_SETMAC->mac[0]), (U8) (RCUD_SETMAC->mac[1]), (U8) (RCUD_SETMAC->mac[2]),
                    (U8) (RCUD_SETMAC->mac[3]), (U8) (RCUD_SETMAC->mac[4]), (U8) (RCUD_SETMAC->mac[5]));
            RCSetMAC(dev, (PU8) &RCUD_SETMAC->mac);
            break;
        case RCUC_SETSPEED:
            printk(KERN_INFO "(rcpci45 driver:) RC SETSPEED\n");
            RCUD_SETSPEED = &RCuser.RCUS_SETSPEED;
            RCSetLinkSpeed(dev, (U16) RCUD_SETSPEED->LinkSpeedCode);
            printk(KERN_INFO "(rcpci45 driver:) RC New speed = 0x%x\n", RCUD_SETSPEED->LinkSpeedCode);
            break;
        case RCUC_SETPROM:
            printk(KERN_INFO "(rcpci45 driver:) RC SETPROM\n");
            RCUD_SETPROM = &RCuser.RCUS_SETPROM;
            RCSetPromiscuousMode(dev,(U16)RCUD_SETPROM->PromMode);
            printk(KERN_INFO "(rcpci45 driver:) RC New prom mode = 0x%x\n", RCUD_SETPROM->PromMode);
            break;
        case RCUC_SETBROADCAST:
            printk(KERN_INFO "(rcpci45 driver:) RC SETBROADCAST\n");
            RCUD_SETBROADCAST = &RCuser.RCUS_SETBROADCAST;
            RCSetBroadcastMode(dev,(U16)RCUD_SETBROADCAST->BroadcastMode);
            printk(KERN_INFO "(rcpci45 driver:) RC New broadcast mode = 0x%x\n", RCUD_SETBROADCAST->BroadcastMode);
            break;
        default:
            printk(KERN_INFO "(rcpci45 driver:) RC command default\n");
            RCUD_DEFAULT = &RCuser.RCUS_DEFAULT;
            RCUD_DEFAULT -> rc = 0x11223344;
            break;
        }
        if(copy_to_user(rq->ifr_data, &RCuser, sizeof(RCuser)))
        	return -EFAULT;
        break;
	}   /* RCU_COMMAND */ 

	default:
        	rq->ifr_ifru.ifru_data = (caddr_t) 0x12345678;
        	return -EINVAL;
    }
    return 0;
}

static int RCconfig(struct net_device *dev, struct ifmap *map)
{
    /*
     * To be completed ...
      */
    dprintk("RCconfig\n");
    return 0;
    if (dev->flags & IFF_UP)    /* can't act on a running interface */
        return -EBUSY;

     /* Don't allow changing the I/O address */
    if (map->base_addr != dev->base_addr) {
        printk(KERN_WARNING "(rcpci45 driver:)  Change I/O address not implemented\n");
        return -EOPNOTSUPP;
    }
    return 0;
}


static void __exit rcpci_cleanup_module (void)
{
	pci_unregister_driver(&rcpci45_driver);
}

module_init(rcpci_init_module);
module_exit(rcpci_cleanup_module);


static int
RC_allocate_and_post_buffers(struct net_device *dev, int numBuffers)
{

    int i;
    PU32 p;
    psingleB pB;
    struct sk_buff *skb;
    RC_RETURN status;
    U32 res;

    if (!numBuffers)
        return 0;
    else if (numBuffers > MAX_NMBR_POST_BUFFERS_PER_MSG)
    {
        dprintk("Too many buffers requested!\n");
        dprintk("attempting to allocate only 32 buffers\n");
        numBuffers = 32;
    }
    
    p = (PU32) kmalloc(sizeof(U32) + numBuffers*sizeof(singleB), GFP_KERNEL);

    dprintk("TCB = 0x%x\n", (uint)p);

    if (!p)
    {
        printk(KERN_WARNING "(rcpci45 driver:) RCopen: unable to allocate TCB\n");
        return 0;
    }

    p[0] = 0;                              /* Buffer Count */
    pB = (psingleB)((U32)p + sizeof(U32)); /* point to the first buffer */

    dprintk("p[0] = 0x%x, p = 0x%x, pB = 0x%x\n", (uint)p[0], (uint)p, (uint)pB);
    dprintk("pB = 0x%x\n", (uint)pB);

    for (i=0; i<numBuffers; i++)
    {
        skb = dev_alloc_skb(MAX_ETHER_SIZE+2);
        if (!skb)
        {
            dprintk("Doh! RCopen: unable to allocate enough skbs!\n");
            if (*p != 0)        /* did we allocate any buffers at all? */
            {
                dprintk("will post only %d buffers \n", (uint)(*p));
                break;
            }
            else 
            {
                kfree(p);    /* Free the TCB */
                return 0;
            }
        }
        dprintk("post 0x%x\n", (uint)skb);
        skb_reserve(skb, 2);    /* Align IP on 16 byte boundaries */
        pB->context = (U32)skb;
        pB->scount = 1;        /* segment count */
        pB->size = MAX_ETHER_SIZE;
        pB->addr = virt_to_bus((void *)skb->data);
        p[0]++;
        pB++;
    }

    if ( (status = RCPostRecvBuffers(dev, (PRCTCB)p )) != RC_RTN_NO_ERROR)
    {
        printk(KERN_WARNING "(rcpci45 driver:) Post buffer failed with error code 0x%x!\n", status);
        pB = (psingleB)((U32)p + sizeof(U32)); /* point to the first buffer */
        while(p[0])
        {
            skb = (struct sk_buff *)pB->context;
            dprintk("freeing 0x%x\n", (uint)skb);
            dev_kfree_skb (skb);
            p[0]--;
            pB++;
        }
        dprintk("freed all buffers, p[0] = %d\n", (uint)p[0]);
    }
    res = p[0];
    kfree(p);
    return(res);                /* return the number of posted buffers */
}