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 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * File Name:
  *   skfddi.c
  *
  * Copyright Information:
  *   Copyright SysKonnect 1998,1999.
  *
  * The information in this file is provided "AS IS" without warranty.
  *
  * Abstract:
  *   A Linux device driver supporting the SysKonnect FDDI PCI controller
  *   familie.
  *
  * Maintainers:
  *   CG    Christoph Goos (cgoos@syskonnect.de)
  *
  * Contributors:
  *   DM    David S. Miller
  *
  * Address all question to:
  *   linux@syskonnect.de
  *
  * The technical manual for the adapters is available from SysKonnect's
  * web pages: www.syskonnect.com
  * Goto "Support" and search Knowledge Base for "manual".
  *
  * Driver Architecture:
  *   The driver architecture is based on the DEC FDDI driver by
  *   Lawrence V. Stefani and several ethernet drivers.
  *   I also used an existing Windows NT miniport driver.
  *   All hardware dependent functions are handled by the SysKonnect
  *   Hardware Module.
  *   The only headerfiles that are directly related to this source
  *   are skfddi.c, h/types.h, h/osdef1st.h, h/targetos.h.
  *   The others belong to the SysKonnect FDDI Hardware Module and
  *   should better not be changed.
  *
  * Modification History:
  *              Date            Name    Description
  *              02-Mar-98       CG  Created.
  *
  *      10-Mar-99   CG  Support for 2.2.x added.
  *      25-Mar-99   CG  Corrected IRQ routing for SMP (APIC)
  *      26-Oct-99   CG  Fixed compilation error on 2.2.13
  *      12-Nov-99   CG  Source code release
  *      22-Nov-99   CG  Included in kernel source.
  *      07-May-00   DM  64 bit fixes, new dma interface
  *      31-Jul-03   DB  Audit copy_*_user in skfp_ioctl
  *                    Daniele Bellucci <bellucda@tiscali.it>
  *      03-Dec-03   SH  Convert to PCI device model
  *
  * Compilation options (-Dxxx):
  *              DRIVERDEBUG     print lots of messages to log file
  *              DUMPPACKETS     print received/transmitted packets to logfile
  * 
  * Tested cpu architectures:
  *  - i386
  *  - sparc64
  */
 
 /* Version information string - should be updated prior to */
 /* each new release!!! */
 #define VERSION     "2.07"
 
 static const char * const boot_msg = 
     "SysKonnect FDDI PCI Adapter driver v" VERSION " for\n"
     "  SK-55xx/SK-58xx adapters (SK-NET FDDI-FP/UP/LP)";
 
 /* Include files */
 
 #include <linux/capability.h>
 #include <linux/compat.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/ioport.h>
 #include <linux/interrupt.h>
 #include <linux/pci.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
 #include <linux/fddidevice.h>
 #include <linux/skbuff.h>
 #include <linux/bitops.h>
 #include <linux/gfp.h>
 
 #include <asm/byteorder.h>
 #include <asm/io.h>
 #include <linux/uaccess.h>
 
 #include    "h/types.h"
 #undef ADDR         // undo Linux definition
 #include    "h/skfbi.h"
 #include    "h/fddi.h"
 #include    "h/smc.h"
 #include    "h/smtstate.h"
 
 
 // Define module-wide (static) routines
 static int skfp_driver_init(struct net_device *dev);
 static int skfp_open(struct net_device *dev);
 static int skfp_close(struct net_device *dev);
 static irqreturn_t skfp_interrupt(int irq, void *dev_id);
 static struct net_device_stats *skfp_ctl_get_stats(struct net_device *dev);
 static void skfp_ctl_set_multicast_list(struct net_device *dev);
 static void skfp_ctl_set_multicast_list_wo_lock(struct net_device *dev);
 static int skfp_ctl_set_mac_address(struct net_device *dev, void *addr);
 static int skfp_siocdevprivate(struct net_device *dev, struct ifreq *rq,
                    void __user *data, int cmd);
 static netdev_tx_t skfp_send_pkt(struct sk_buff *skb,
                        struct net_device *dev);
 static void send_queued_packets(struct s_smc *smc);
 static void CheckSourceAddress(unsigned char *frame, unsigned char *hw_addr);
 static void ResetAdapter(struct s_smc *smc);
 
 
 // Functions needed by the hardware module
 void *mac_drv_get_space(struct s_smc *smc, u_int size);
 void *mac_drv_get_desc_mem(struct s_smc *smc, u_int size);
 unsigned long mac_drv_virt2phys(struct s_smc *smc, void *virt);
 unsigned long dma_master(struct s_smc *smc, void *virt, int len, int flag);
 void dma_complete(struct s_smc *smc, volatile union s_fp_descr *descr,
           int flag);
 void mac_drv_tx_complete(struct s_smc *smc, volatile struct s_smt_fp_txd *txd);
 void llc_restart_tx(struct s_smc *smc);
 void mac_drv_rx_complete(struct s_smc *smc, volatile struct s_smt_fp_rxd *rxd,
              int frag_count, int len);
 void mac_drv_requeue_rxd(struct s_smc *smc, volatile struct s_smt_fp_rxd *rxd,
              int frag_count);
 void mac_drv_fill_rxd(struct s_smc *smc);
 void mac_drv_clear_rxd(struct s_smc *smc, volatile struct s_smt_fp_rxd *rxd,
                int frag_count);
 int mac_drv_rx_init(struct s_smc *smc, int len, int fc, char *look_ahead,
             int la_len);
 void dump_data(unsigned char *Data, int length);
 
 // External functions from the hardware module
 extern u_int mac_drv_check_space(void);
 extern int mac_drv_init(struct s_smc *smc);
 extern void hwm_tx_frag(struct s_smc *smc, char far * virt, u_long phys,
             int len, int frame_status);
 extern int hwm_tx_init(struct s_smc *smc, u_char fc, int frag_count,
                int frame_len, int frame_status);
 extern void fddi_isr(struct s_smc *smc);
 extern void hwm_rx_frag(struct s_smc *smc, char far * virt, u_long phys,
             int len, int frame_status);
 extern void mac_drv_rx_mode(struct s_smc *smc, int mode);
 extern void mac_drv_clear_rx_queue(struct s_smc *smc);
 extern void enable_tx_irq(struct s_smc *smc, u_short queue);
 
 static const struct pci_device_id skfddi_pci_tbl[] = {
     { PCI_VENDOR_ID_SK, PCI_DEVICE_ID_SK_FP, PCI_ANY_ID, PCI_ANY_ID, },
     { }         /* Terminating entry */
 };
 MODULE_DEVICE_TABLE(pci, skfddi_pci_tbl);
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Mirko Lindner <mlindner@syskonnect.de>");
 
 // Define module-wide (static) variables
 
 static int num_boards;  /* total number of adapters configured */
 
 static const struct net_device_ops skfp_netdev_ops = {
     .ndo_open       = skfp_open,
     .ndo_stop       = skfp_close,
     .ndo_start_xmit     = skfp_send_pkt,
     .ndo_get_stats      = skfp_ctl_get_stats,
     .ndo_set_rx_mode    = skfp_ctl_set_multicast_list,
     .ndo_set_mac_address    = skfp_ctl_set_mac_address,
     .ndo_siocdevprivate = skfp_siocdevprivate,
 };
 
 /*
  * =================
  * = skfp_init_one =
  * =================
  *   
  * Overview:
  *   Probes for supported FDDI PCI controllers
  *  
  * Returns:
  *   Condition code
  *       
  * Arguments:
  *   pdev - pointer to PCI device information
  *
  * Functional Description:
  *   This is now called by PCI driver registration process
  *   for each board found.
  *   
  * Return Codes:
  *   0           - This device (fddi0, fddi1, etc) configured successfully
  *   -ENODEV - No devices present, or no SysKonnect FDDI PCI device
  *                         present for this device name
  *
  *
  * Side Effects:
  *   Device structures for FDDI adapters (fddi0, fddi1, etc) are
  *   initialized and the board resources are read and stored in
  *   the device structure.
  */
 static int skfp_init_one(struct pci_dev *pdev,
                 const struct pci_device_id *ent)
 {
     struct net_device *dev;
     struct s_smc *smc;  /* board pointer */
     void __iomem *mem;
     int err;
 
     pr_debug("entering skfp_init_one\n");
 
     if (num_boards == 0) 
         printk("%s\n", boot_msg);
 
     err = pci_enable_device(pdev);
     if (err)
         return err;
 
     err = pci_request_regions(pdev, "skfddi");
     if (err)
         goto err_out1;
 
     pci_set_master(pdev);
 
 #ifdef MEM_MAPPED_IO
     if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
         printk(KERN_ERR "skfp: region is not an MMIO resource\n");
         err = -EIO;
         goto err_out2;
     }
 
     mem = ioremap(pci_resource_start(pdev, 0), 0x4000);
 #else
     if (!(pci_resource_flags(pdev, 1) & IO_RESOURCE_IO)) {
         printk(KERN_ERR "skfp: region is not PIO resource\n");
         err = -EIO;
         goto err_out2;
     }
 
     mem = ioport_map(pci_resource_start(pdev, 1), FP_IO_LEN);
 #endif
     if (!mem) {
         printk(KERN_ERR "skfp:  Unable to map register, "
                 "FDDI adapter will be disabled.\n");
         err = -EIO;
         goto err_out2;
     }
 
     dev = alloc_fddidev(sizeof(struct s_smc));
     if (!dev) {
         printk(KERN_ERR "skfp: Unable to allocate fddi device, "
                 "FDDI adapter will be disabled.\n");
         err = -ENOMEM;
         goto err_out3;
     }
 
     dev->irq = pdev->irq;
     dev->netdev_ops = &skfp_netdev_ops;
 
     SET_NETDEV_DEV(dev, &pdev->dev);
 
     /* Initialize board structure with bus-specific info */
     smc = netdev_priv(dev);
     smc->os.dev = dev;
     smc->os.bus_type = SK_BUS_TYPE_PCI;
     smc->os.pdev = *pdev;
     smc->os.QueueSkb = MAX_TX_QUEUE_LEN;
     smc->os.MaxFrameSize = MAX_FRAME_SIZE;
     smc->os.dev = dev;
     smc->hw.slot = -1;
     smc->hw.iop = mem;
     smc->os.ResetRequested = FALSE;
     skb_queue_head_init(&smc->os.SendSkbQueue);
 
     dev->base_addr = (unsigned long)mem;
 
     err = skfp_driver_init(dev);
     if (err)
         goto err_out4;
 
     err = register_netdev(dev);
     if (err)
         goto err_out5;
 
     ++num_boards;
     pci_set_drvdata(pdev, dev);
 
     if ((pdev->subsystem_device & 0xff00) == 0x5500 ||
         (pdev->subsystem_device & 0xff00) == 0x5800) 
         printk("%s: SysKonnect FDDI PCI adapter"
                " found (SK-%04X)\n", dev->name, 
                pdev->subsystem_device);
     else
         printk("%s: FDDI PCI adapter found\n", dev->name);
 
     return 0;
 err_out5:
     if (smc->os.SharedMemAddr) 
         dma_free_coherent(&pdev->dev, smc->os.SharedMemSize,
                   smc->os.SharedMemAddr,
                   smc->os.SharedMemDMA);
     dma_free_coherent(&pdev->dev, MAX_FRAME_SIZE,
               smc->os.LocalRxBuffer, smc->os.LocalRxBufferDMA);
 err_out4:
     free_netdev(dev);
 err_out3:
 #ifdef MEM_MAPPED_IO
     iounmap(mem);
 #else
     ioport_unmap(mem);
 #endif
 err_out2:
     pci_release_regions(pdev);
 err_out1:
     pci_disable_device(pdev);
     return err;
 }
 
 /*
  * Called for each adapter board from pci_unregister_driver
  */
 static void skfp_remove_one(struct pci_dev *pdev)
 {
     struct net_device *p = pci_get_drvdata(pdev);
     struct s_smc *lp = netdev_priv(p);
 
     unregister_netdev(p);
 
     if (lp->os.SharedMemAddr) {
         dma_free_coherent(&pdev->dev,
                   lp->os.SharedMemSize,
                   lp->os.SharedMemAddr,
                   lp->os.SharedMemDMA);
         lp->os.SharedMemAddr = NULL;
     }
     if (lp->os.LocalRxBuffer) {
         dma_free_coherent(&pdev->dev,
                   MAX_FRAME_SIZE,
                   lp->os.LocalRxBuffer,
                   lp->os.LocalRxBufferDMA);
         lp->os.LocalRxBuffer = NULL;
     }
 #ifdef MEM_MAPPED_IO
     iounmap(lp->hw.iop);
 #else
     ioport_unmap(lp->hw.iop);
 #endif
     pci_release_regions(pdev);
     free_netdev(p);
 
     pci_disable_device(pdev);
 }
 
 /*
  * ====================
  * = skfp_driver_init =
  * ====================
  *   
  * Overview:
  *   Initializes remaining adapter board structure information
  *   and makes sure adapter is in a safe state prior to skfp_open().
  *  
  * Returns:
  *   Condition code
  *       
  * Arguments:
  *   dev - pointer to device information
  *
  * Functional Description:
  *   This function allocates additional resources such as the host memory
  *   blocks needed by the adapter.
  *   The adapter is also reset. The OS must call skfp_open() to open 
  *   the adapter and bring it on-line.
  *
  * Return Codes:
  *    0 - initialization succeeded
  *   -1 - initialization failed
  */
 static  int skfp_driver_init(struct net_device *dev)
 {
     struct s_smc *smc = netdev_priv(dev);
     skfddi_priv *bp = &smc->os;
     int err = -EIO;
 
     pr_debug("entering skfp_driver_init\n");
 
     // set the io address in private structures
     bp->base_addr = dev->base_addr;
 
     // Get the interrupt level from the PCI Configuration Table
     smc->hw.irq = dev->irq;
 
     spin_lock_init(&bp->DriverLock);
     
     // Allocate invalid frame
     bp->LocalRxBuffer = dma_alloc_coherent(&bp->pdev.dev, MAX_FRAME_SIZE,
                            &bp->LocalRxBufferDMA,
                            GFP_ATOMIC);
     if (!bp->LocalRxBuffer) {
         printk("could not allocate mem for ");
         printk("LocalRxBuffer: %d byte\n", MAX_FRAME_SIZE);
         goto fail;
     }
 
     // Determine the required size of the 'shared' memory area.
     bp->SharedMemSize = mac_drv_check_space();
     pr_debug("Memory for HWM: %ld\n", bp->SharedMemSize);
     if (bp->SharedMemSize > 0) {
         bp->SharedMemSize += 16;    // for descriptor alignment
 
         bp->SharedMemAddr = dma_alloc_coherent(&bp->pdev.dev,
                                bp->SharedMemSize,
                                &bp->SharedMemDMA,
                                GFP_ATOMIC);
         if (!bp->SharedMemAddr) {
             printk("could not allocate mem for ");
             printk("hardware module: %ld byte\n",
                    bp->SharedMemSize);
             goto fail;
         }
 
     } else {
         bp->SharedMemAddr = NULL;
     }
 
     bp->SharedMemHeap = 0;
 
     card_stop(smc);     // Reset adapter.
 
     pr_debug("mac_drv_init()..\n");
     if (mac_drv_init(smc) != 0) {
         pr_debug("mac_drv_init() failed\n");
         goto fail;
     }
     read_address(smc, NULL);
     pr_debug("HW-Addr: %pMF\n", smc->hw.fddi_canon_addr.a);
     eth_hw_addr_set(dev, smc->hw.fddi_canon_addr.a);
 
     smt_reset_defaults(smc, 0);
 
     return 0;
 
 fail:
     if (bp->SharedMemAddr) {
         dma_free_coherent(&bp->pdev.dev,
                   bp->SharedMemSize,
                   bp->SharedMemAddr,
                   bp->SharedMemDMA);
         bp->SharedMemAddr = NULL;
     }
     if (bp->LocalRxBuffer) {
         dma_free_coherent(&bp->pdev.dev, MAX_FRAME_SIZE,
                   bp->LocalRxBuffer, bp->LocalRxBufferDMA);
         bp->LocalRxBuffer = NULL;
     }
     return err;
 }               // skfp_driver_init
 
 
 /*
  * =============
  * = skfp_open =
  * =============
  *   
  * Overview:
  *   Opens the adapter
  *  
  * Returns:
  *   Condition code
  *       
  * Arguments:
  *   dev - pointer to device information
  *
  * Functional Description:
  *   This function brings the adapter to an operational state.
  *
  * Return Codes:
  *   0           - Adapter was successfully opened
  *   -EAGAIN - Could not register IRQ
  */
 static int skfp_open(struct net_device *dev)
 {
     struct s_smc *smc = netdev_priv(dev);
     int err;
 
     pr_debug("entering skfp_open\n");
     /* Register IRQ - support shared interrupts by passing device ptr */
     err = request_irq(dev->irq, skfp_interrupt, IRQF_SHARED,
               dev->name, dev);
     if (err)
         return err;
 
     /*
      * Set current address to factory MAC address
      *
      * Note: We've already done this step in skfp_driver_init.
      *       However, it's possible that a user has set a node
      *               address override, then closed and reopened the
      *               adapter.  Unless we reset the device address field
      *               now, we'll continue to use the existing modified
      *               address.
      */
     read_address(smc, NULL);
     eth_hw_addr_set(dev, smc->hw.fddi_canon_addr.a);
 
     init_smt(smc, NULL);
     smt_online(smc, 1);
     STI_FBI();
 
     /* Clear local multicast address tables */
     mac_clear_multicast(smc);
 
     /* Disable promiscuous filter settings */
     mac_drv_rx_mode(smc, RX_DISABLE_PROMISC);
 
     netif_start_queue(dev);
     return 0;
 }               // skfp_open
 
 
 /*
  * ==============
  * = skfp_close =
  * ==============
  *   
  * Overview:
  *   Closes the device/module.
  *  
  * Returns:
  *   Condition code
  *       
  * Arguments:
  *   dev - pointer to device information
  *
  * Functional Description:
  *   This routine closes the adapter and brings it to a safe state.
  *   The interrupt service routine is deregistered with the OS.
  *   The adapter can be opened again with another call to skfp_open().
  *
  * Return Codes:
  *   Always return 0.
  *
  * Assumptions:
  *   No further requests for this adapter are made after this routine is
  *   called.  skfp_open() can be called to reset and reinitialize the
  *   adapter.
  */
 static int skfp_close(struct net_device *dev)
 {
     struct s_smc *smc = netdev_priv(dev);
     skfddi_priv *bp = &smc->os;
 
     CLI_FBI();
     smt_reset_defaults(smc, 1);
     card_stop(smc);
     mac_drv_clear_tx_queue(smc);
     mac_drv_clear_rx_queue(smc);
 
     netif_stop_queue(dev);
     /* Deregister (free) IRQ */
     free_irq(dev->irq, dev);
 
     skb_queue_purge(&bp->SendSkbQueue);
     bp->QueueSkb = MAX_TX_QUEUE_LEN;
 
     return 0;
 }               // skfp_close
 
 
 /*
  * ==================
  * = skfp_interrupt =
  * ==================
  *   
  * Overview:
  *   Interrupt processing routine
  *  
  * Returns:
  *   None
  *       
  * Arguments:
  *   irq        - interrupt vector
  *   dev_id     - pointer to device information
  *
  * Functional Description:
  *   This routine calls the interrupt processing routine for this adapter.  It
  *   disables and reenables adapter interrupts, as appropriate.  We can support
  *   shared interrupts since the incoming dev_id pointer provides our device
  *   structure context. All the real work is done in the hardware module.
  *
  * Return Codes:
  *   None
  *
  * Assumptions:
  *   The interrupt acknowledgement at the hardware level (eg. ACKing the PIC
  *   on Intel-based systems) is done by the operating system outside this
  *   routine.
  *
  *       System interrupts are enabled through this call.
  *
  * Side Effects:
  *   Interrupts are disabled, then reenabled at the adapter.
  */
 
 static irqreturn_t skfp_interrupt(int irq, void *dev_id)
 {
     struct net_device *dev = dev_id;
     struct s_smc *smc;  /* private board structure pointer */
     skfddi_priv *bp;
 
     smc = netdev_priv(dev);
     bp = &smc->os;
 
     // IRQs enabled or disabled ?
     if (inpd(ADDR(B0_IMSK)) == 0) {
         // IRQs are disabled: must be shared interrupt
         return IRQ_NONE;
     }
     // Note: At this point, IRQs are enabled.
     if ((inpd(ISR_A) & smc->hw.is_imask) == 0) {    // IRQ?
         // Adapter did not issue an IRQ: must be shared interrupt
         return IRQ_NONE;
     }
     CLI_FBI();      // Disable IRQs from our adapter.
     spin_lock(&bp->DriverLock);
 
     // Call interrupt handler in hardware module (HWM).
     fddi_isr(smc);
 
     if (smc->os.ResetRequested) {
         ResetAdapter(smc);
         smc->os.ResetRequested = FALSE;
     }
     spin_unlock(&bp->DriverLock);
     STI_FBI();      // Enable IRQs from our adapter.
 
     return IRQ_HANDLED;
 }               // skfp_interrupt
 
 
 /*
  * ======================
  * = skfp_ctl_get_stats =
  * ======================
  *   
  * Overview:
  *   Get statistics for FDDI adapter
  *  
  * Returns:
  *   Pointer to FDDI statistics structure
  *       
  * Arguments:
  *   dev - pointer to device information
  *
  * Functional Description:
  *   Gets current MIB objects from adapter, then
  *   returns FDDI statistics structure as defined
  *   in if_fddi.h.
  *
  *   Note: Since the FDDI statistics structure is
  *   still new and the device structure doesn't
  *   have an FDDI-specific get statistics handler,
  *   we'll return the FDDI statistics structure as
  *   a pointer to an Ethernet statistics structure.
  *   That way, at least the first part of the statistics
  *   structure can be decoded properly.
  *   We'll have to pay attention to this routine as the
  *   device structure becomes more mature and LAN media
  *   independent.
  *
  */
 static struct net_device_stats *skfp_ctl_get_stats(struct net_device *dev)
 {
     struct s_smc *bp = netdev_priv(dev);
 
     /* Fill the bp->stats structure with driver-maintained counters */
 
     bp->os.MacStat.port_bs_flag[0] = 0x1234;
     bp->os.MacStat.port_bs_flag[1] = 0x5678;
 // goos: need to fill out fddi statistic
 #if 0
     /* Get FDDI SMT MIB objects */
 
 /* Fill the bp->stats structure with the SMT MIB object values */
 
     memcpy(bp->stats.smt_station_id, &bp->cmd_rsp_virt->smt_mib_get.smt_station_id, sizeof(bp->cmd_rsp_virt->smt_mib_get.smt_station_id));
     bp->stats.smt_op_version_id = bp->cmd_rsp_virt->smt_mib_get.smt_op_version_id;
     bp->stats.smt_hi_version_id = bp->cmd_rsp_virt->smt_mib_get.smt_hi_version_id;
     bp->stats.smt_lo_version_id = bp->cmd_rsp_virt->smt_mib_get.smt_lo_version_id;
     memcpy(bp->stats.smt_user_data, &bp->cmd_rsp_virt->smt_mib_get.smt_user_data, sizeof(bp->cmd_rsp_virt->smt_mib_get.smt_user_data));
     bp->stats.smt_mib_version_id = bp->cmd_rsp_virt->smt_mib_get.smt_mib_version_id;
     bp->stats.smt_mac_cts = bp->cmd_rsp_virt->smt_mib_get.smt_mac_ct;
     bp->stats.smt_non_master_cts = bp->cmd_rsp_virt->smt_mib_get.smt_non_master_ct;
     bp->stats.smt_master_cts = bp->cmd_rsp_virt->smt_mib_get.smt_master_ct;
     bp->stats.smt_available_paths = bp->cmd_rsp_virt->smt_mib_get.smt_available_paths;
     bp->stats.smt_config_capabilities = bp->cmd_rsp_virt->smt_mib_get.smt_config_capabilities;
     bp->stats.smt_config_policy = bp->cmd_rsp_virt->smt_mib_get.smt_config_policy;
     bp->stats.smt_connection_policy = bp->cmd_rsp_virt->smt_mib_get.smt_connection_policy;
     bp->stats.smt_t_notify = bp->cmd_rsp_virt->smt_mib_get.smt_t_notify;
     bp->stats.smt_stat_rpt_policy = bp->cmd_rsp_virt->smt_mib_get.smt_stat_rpt_policy;
     bp->stats.smt_trace_max_expiration = bp->cmd_rsp_virt->smt_mib_get.smt_trace_max_expiration;
     bp->stats.smt_bypass_present = bp->cmd_rsp_virt->smt_mib_get.smt_bypass_present;
     bp->stats.smt_ecm_state = bp->cmd_rsp_virt->smt_mib_get.smt_ecm_state;
     bp->stats.smt_cf_state = bp->cmd_rsp_virt->smt_mib_get.smt_cf_state;
     bp->stats.smt_remote_disconnect_flag = bp->cmd_rsp_virt->smt_mib_get.smt_remote_disconnect_flag;
     bp->stats.smt_station_status = bp->cmd_rsp_virt->smt_mib_get.smt_station_status;
     bp->stats.smt_peer_wrap_flag = bp->cmd_rsp_virt->smt_mib_get.smt_peer_wrap_flag;
     bp->stats.smt_time_stamp = bp->cmd_rsp_virt->smt_mib_get.smt_msg_time_stamp.ls;
     bp->stats.smt_transition_time_stamp = bp->cmd_rsp_virt->smt_mib_get.smt_transition_time_stamp.ls;
     bp->stats.mac_frame_status_functions = bp->cmd_rsp_virt->smt_mib_get.mac_frame_status_functions;
     bp->stats.mac_t_max_capability = bp->cmd_rsp_virt->smt_mib_get.mac_t_max_capability;
     bp->stats.mac_tvx_capability = bp->cmd_rsp_virt->smt_mib_get.mac_tvx_capability;
     bp->stats.mac_available_paths = bp->cmd_rsp_virt->smt_mib_get.mac_available_paths;
     bp->stats.mac_current_path = bp->cmd_rsp_virt->smt_mib_get.mac_current_path;
     memcpy(bp->stats.mac_upstream_nbr, &bp->cmd_rsp_virt->smt_mib_get.mac_upstream_nbr, FDDI_K_ALEN);
     memcpy(bp->stats.mac_downstream_nbr, &bp->cmd_rsp_virt->smt_mib_get.mac_downstream_nbr, FDDI_K_ALEN);
     memcpy(bp->stats.mac_old_upstream_nbr, &bp->cmd_rsp_virt->smt_mib_get.mac_old_upstream_nbr, FDDI_K_ALEN);
     memcpy(bp->stats.mac_old_downstream_nbr, &bp->cmd_rsp_virt->smt_mib_get.mac_old_downstream_nbr, FDDI_K_ALEN);
     bp->stats.mac_dup_address_test = bp->cmd_rsp_virt->smt_mib_get.mac_dup_address_test;
     bp->stats.mac_requested_paths = bp->cmd_rsp_virt->smt_mib_get.mac_requested_paths;
     bp->stats.mac_downstream_port_type = bp->cmd_rsp_virt->smt_mib_get.mac_downstream_port_type;
     memcpy(bp->stats.mac_smt_address, &bp->cmd_rsp_virt->smt_mib_get.mac_smt_address, FDDI_K_ALEN);
     bp->stats.mac_t_req = bp->cmd_rsp_virt->smt_mib_get.mac_t_req;
     bp->stats.mac_t_neg = bp->cmd_rsp_virt->smt_mib_get.mac_t_neg;
     bp->stats.mac_t_max = bp->cmd_rsp_virt->smt_mib_get.mac_t_max;
     bp->stats.mac_tvx_value = bp->cmd_rsp_virt->smt_mib_get.mac_tvx_value;
     bp->stats.mac_frame_error_threshold = bp->cmd_rsp_virt->smt_mib_get.mac_frame_error_threshold;
     bp->stats.mac_frame_error_ratio = bp->cmd_rsp_virt->smt_mib_get.mac_frame_error_ratio;
     bp->stats.mac_rmt_state = bp->cmd_rsp_virt->smt_mib_get.mac_rmt_state;
     bp->stats.mac_da_flag = bp->cmd_rsp_virt->smt_mib_get.mac_da_flag;
     bp->stats.mac_una_da_flag = bp->cmd_rsp_virt->smt_mib_get.mac_unda_flag;
     bp->stats.mac_frame_error_flag = bp->cmd_rsp_virt->smt_mib_get.mac_frame_error_flag;
     bp->stats.mac_ma_unitdata_available = bp->cmd_rsp_virt->smt_mib_get.mac_ma_unitdata_available;
     bp->stats.mac_hardware_present = bp->cmd_rsp_virt->smt_mib_get.mac_hardware_present;
     bp->stats.mac_ma_unitdata_enable = bp->cmd_rsp_virt->smt_mib_get.mac_ma_unitdata_enable;
     bp->stats.path_tvx_lower_bound = bp->cmd_rsp_virt->smt_mib_get.path_tvx_lower_bound;
     bp->stats.path_t_max_lower_bound = bp->cmd_rsp_virt->smt_mib_get.path_t_max_lower_bound;
     bp->stats.path_max_t_req = bp->cmd_rsp_virt->smt_mib_get.path_max_t_req;
     memcpy(bp->stats.path_configuration, &bp->cmd_rsp_virt->smt_mib_get.path_configuration, sizeof(bp->cmd_rsp_virt->smt_mib_get.path_configuration));
     bp->stats.port_my_type[0] = bp->cmd_rsp_virt->smt_mib_get.port_my_type[0];
     bp->stats.port_my_type[1] = bp->cmd_rsp_virt->smt_mib_get.port_my_type[1];
     bp->stats.port_neighbor_type[0] = bp->cmd_rsp_virt->smt_mib_get.port_neighbor_type[0];
     bp->stats.port_neighbor_type[1] = bp->cmd_rsp_virt->smt_mib_get.port_neighbor_type[1];
     bp->stats.port_connection_policies[0] = bp->cmd_rsp_virt->smt_mib_get.port_connection_policies[0];
     bp->stats.port_connection_policies[1] = bp->cmd_rsp_virt->smt_mib_get.port_connection_policies[1];
     bp->stats.port_mac_indicated[0] = bp->cmd_rsp_virt->smt_mib_get.port_mac_indicated[0];
     bp->stats.port_mac_indicated[1] = bp->cmd_rsp_virt->smt_mib_get.port_mac_indicated[1];
     bp->stats.port_current_path[0] = bp->cmd_rsp_virt->smt_mib_get.port_current_path[0];
     bp->stats.port_current_path[1] = bp->cmd_rsp_virt->smt_mib_get.port_current_path[1];
     memcpy(&bp->stats.port_requested_paths[0 * 3], &bp->cmd_rsp_virt->smt_mib_get.port_requested_paths[0], 3);
     memcpy(&bp->stats.port_requested_paths[1 * 3], &bp->cmd_rsp_virt->smt_mib_get.port_requested_paths[1], 3);
     bp->stats.port_mac_placement[0] = bp->cmd_rsp_virt->smt_mib_get.port_mac_placement[0];
     bp->stats.port_mac_placement[1] = bp->cmd_rsp_virt->smt_mib_get.port_mac_placement[1];
     bp->stats.port_available_paths[0] = bp->cmd_rsp_virt->smt_mib_get.port_available_paths[0];
     bp->stats.port_available_paths[1] = bp->cmd_rsp_virt->smt_mib_get.port_available_paths[1];
     bp->stats.port_pmd_class[0] = bp->cmd_rsp_virt->smt_mib_get.port_pmd_class[0];
     bp->stats.port_pmd_class[1] = bp->cmd_rsp_virt->smt_mib_get.port_pmd_class[1];
     bp->stats.port_connection_capabilities[0] = bp->cmd_rsp_virt->smt_mib_get.port_connection_capabilities[0];
     bp->stats.port_connection_capabilities[1] = bp->cmd_rsp_virt->smt_mib_get.port_connection_capabilities[1];
     bp->stats.port_bs_flag[0] = bp->cmd_rsp_virt->smt_mib_get.port_bs_flag[0];
     bp->stats.port_bs_flag[1] = bp->cmd_rsp_virt->smt_mib_get.port_bs_flag[1];
     bp->stats.port_ler_estimate[0] = bp->cmd_rsp_virt->smt_mib_get.port_ler_estimate[0];
     bp->stats.port_ler_estimate[1] = bp->cmd_rsp_virt->smt_mib_get.port_ler_estimate[1];
     bp->stats.port_ler_cutoff[0] = bp->cmd_rsp_virt->smt_mib_get.port_ler_cutoff[0];
     bp->stats.port_ler_cutoff[1] = bp->cmd_rsp_virt->smt_mib_get.port_ler_cutoff[1];
     bp->stats.port_ler_alarm[0] = bp->cmd_rsp_virt->smt_mib_get.port_ler_alarm[0];
     bp->stats.port_ler_alarm[1] = bp->cmd_rsp_virt->smt_mib_get.port_ler_alarm[1];
     bp->stats.port_connect_state[0] = bp->cmd_rsp_virt->smt_mib_get.port_connect_state[0];
     bp->stats.port_connect_state[1] = bp->cmd_rsp_virt->smt_mib_get.port_connect_state[1];
     bp->stats.port_pcm_state[0] = bp->cmd_rsp_virt->smt_mib_get.port_pcm_state[0];
     bp->stats.port_pcm_state[1] = bp->cmd_rsp_virt->smt_mib_get.port_pcm_state[1];
     bp->stats.port_pc_withhold[0] = bp->cmd_rsp_virt->smt_mib_get.port_pc_withhold[0];
     bp->stats.port_pc_withhold[1] = bp->cmd_rsp_virt->smt_mib_get.port_pc_withhold[1];
     bp->stats.port_ler_flag[0] = bp->cmd_rsp_virt->smt_mib_get.port_ler_flag[0];
     bp->stats.port_ler_flag[1] = bp->cmd_rsp_virt->smt_mib_get.port_ler_flag[1];
     bp->stats.port_hardware_present[0] = bp->cmd_rsp_virt->smt_mib_get.port_hardware_present[0];
     bp->stats.port_hardware_present[1] = bp->cmd_rsp_virt->smt_mib_get.port_hardware_present[1];
 
 
     /* Fill the bp->stats structure with the FDDI counter values */
 
     bp->stats.mac_frame_cts = bp->cmd_rsp_virt->cntrs_get.cntrs.frame_cnt.ls;
     bp->stats.mac_copied_cts = bp->cmd_rsp_virt->cntrs_get.cntrs.copied_cnt.ls;
     bp->stats.mac_transmit_cts = bp->cmd_rsp_virt->cntrs_get.cntrs.transmit_cnt.ls;
     bp->stats.mac_error_cts = bp->cmd_rsp_virt->cntrs_get.cntrs.error_cnt.ls;
     bp->stats.mac_lost_cts = bp->cmd_rsp_virt->cntrs_get.cntrs.lost_cnt.ls;
     bp->stats.port_lct_fail_cts[0] = bp->cmd_rsp_virt->cntrs_get.cntrs.lct_rejects[0].ls;
     bp->stats.port_lct_fail_cts[1] = bp->cmd_rsp_virt->cntrs_get.cntrs.lct_rejects[1].ls;
     bp->stats.port_lem_reject_cts[0] = bp->cmd_rsp_virt->cntrs_get.cntrs.lem_rejects[0].ls;
     bp->stats.port_lem_reject_cts[1] = bp->cmd_rsp_virt->cntrs_get.cntrs.lem_rejects[1].ls;
     bp->stats.port_lem_cts[0] = bp->cmd_rsp_virt->cntrs_get.cntrs.link_errors[0].ls;
     bp->stats.port_lem_cts[1] = bp->cmd_rsp_virt->cntrs_get.cntrs.link_errors[1].ls;
 
 #endif
     return (struct net_device_stats *)&bp->os.MacStat;
 }               // ctl_get_stat
 
 
 /*
  * ==============================
  * = skfp_ctl_set_multicast_list =
  * ==============================
  *   
  * Overview:
  *   Enable/Disable LLC frame promiscuous mode reception
  *   on the adapter and/or update multicast address table.
  *  
  * Returns:
  *   None
  *       
  * Arguments:
  *   dev - pointer to device information
  *
  * Functional Description:
  *   This function acquires the driver lock and only calls
  *   skfp_ctl_set_multicast_list_wo_lock then.
  *   This routine follows a fairly simple algorithm for setting the
  *   adapter filters and CAM:
  *
  *      if IFF_PROMISC flag is set
  *              enable promiscuous mode
  *      else
  *              disable promiscuous mode
  *              if number of multicast addresses <= max. multicast number
  *                      add mc addresses to adapter table
  *              else
  *                      enable promiscuous mode
  *              update adapter filters
  *
  * Assumptions:
  *   Multicast addresses are presented in canonical (LSB) format.
  *
  * Side Effects:
  *   On-board adapter filters are updated.
  */
 static void skfp_ctl_set_multicast_list(struct net_device *dev)
 {
     struct s_smc *smc = netdev_priv(dev);
     skfddi_priv *bp = &smc->os;
     unsigned long Flags;
 
     spin_lock_irqsave(&bp->DriverLock, Flags);
     skfp_ctl_set_multicast_list_wo_lock(dev);
     spin_unlock_irqrestore(&bp->DriverLock, Flags);
 }               // skfp_ctl_set_multicast_list
 
 
 
 static void skfp_ctl_set_multicast_list_wo_lock(struct net_device *dev)
 {
     struct s_smc *smc = netdev_priv(dev);
     struct netdev_hw_addr *ha;
 
     /* Enable promiscuous mode, if necessary */
     if (dev->flags & IFF_PROMISC) {
         mac_drv_rx_mode(smc, RX_ENABLE_PROMISC);
         pr_debug("PROMISCUOUS MODE ENABLED\n");
     }
     /* Else, update multicast address table */
     else {
         mac_drv_rx_mode(smc, RX_DISABLE_PROMISC);
         pr_debug("PROMISCUOUS MODE DISABLED\n");
 
         // Reset all MC addresses
         mac_clear_multicast(smc);
         mac_drv_rx_mode(smc, RX_DISABLE_ALLMULTI);
 
         if (dev->flags & IFF_ALLMULTI) {
             mac_drv_rx_mode(smc, RX_ENABLE_ALLMULTI);
             pr_debug("ENABLE ALL MC ADDRESSES\n");
         } else if (!netdev_mc_empty(dev)) {
             if (netdev_mc_count(dev) <= FPMAX_MULTICAST) {
                 /* use exact filtering */
 
                 // point to first multicast addr
                 netdev_for_each_mc_addr(ha, dev) {
                     mac_add_multicast(smc,
                         (struct fddi_addr *)ha->addr,
                         1);
 
                     pr_debug("ENABLE MC ADDRESS: %pMF\n",
                          ha->addr);
                 }
 
             } else {    // more MC addresses than HW supports
 
                 mac_drv_rx_mode(smc, RX_ENABLE_ALLMULTI);
                 pr_debug("ENABLE ALL MC ADDRESSES\n");
             }
         } else {    // no MC addresses
 
             pr_debug("DISABLE ALL MC ADDRESSES\n");
         }
 
         /* Update adapter filters */
         mac_update_multicast(smc);
     }
 }               // skfp_ctl_set_multicast_list_wo_lock
 
 
 /*
  * ===========================
  * = skfp_ctl_set_mac_address =
  * ===========================
  *   
  * Overview:
  *   set new mac address on adapter and update dev_addr field in device table.
  *  
  * Returns:
  *   None
  *       
  * Arguments:
  *   dev  - pointer to device information
  *   addr - pointer to sockaddr structure containing unicast address to set
  *
  * Assumptions:
  *   The address pointed to by addr->sa_data is a valid unicast
  *   address and is presented in canonical (LSB) format.
  */
 static int skfp_ctl_set_mac_address(struct net_device *dev, void *addr)
 {
     struct s_smc *smc = netdev_priv(dev);
     struct sockaddr *p_sockaddr = (struct sockaddr *) addr;
     skfddi_priv *bp = &smc->os;
     unsigned long Flags;
 
 
     dev_addr_set(dev, p_sockaddr->sa_data);
     spin_lock_irqsave(&bp->DriverLock, Flags);
     ResetAdapter(smc);
     spin_unlock_irqrestore(&bp->DriverLock, Flags);
 
     return 0;       /* always return zero */
 }               // skfp_ctl_set_mac_address
 
 
 /*
  * =======================
  * = skfp_siocdevprivate =
  * =======================
  *   
  * Overview:
  *
  * Perform IOCTL call functions here. Some are privileged operations and the
  * effective uid is checked in those cases.
  *  
  * Returns:
  *   status value
  *   0 - success
  *   other - failure
  *       
  * Arguments:
  *   dev  - pointer to device information
  *   rq - pointer to ioctl request structure
  *   cmd - ?
  *
  */
 
 
 static int skfp_siocdevprivate(struct net_device *dev, struct ifreq *rq, void __user *data, int cmd)
 {
     struct s_smc *smc = netdev_priv(dev);
     skfddi_priv *lp = &smc->os;
     struct s_skfp_ioctl ioc;
     int status = 0;
 
     if (copy_from_user(&ioc, data, sizeof(struct s_skfp_ioctl)))
         return -EFAULT;
 
     if (in_compat_syscall())
         return -EOPNOTSUPP;
 
     switch (ioc.cmd) {
     case SKFP_GET_STATS:    /* Get the driver statistics */
         ioc.len = sizeof(lp->MacStat);
         status = copy_to_user(ioc.data, skfp_ctl_get_stats(dev), ioc.len)
                 ? -EFAULT : 0;
         break;
     case SKFP_CLR_STATS:    /* Zero out the driver statistics */
         if (!capable(CAP_NET_ADMIN)) {
             status = -EPERM;
         } else {
             memset(&lp->MacStat, 0, sizeof(lp->MacStat));
         }
         break;
     default:
         printk("ioctl for %s: unknown cmd: %04x\n", dev->name, ioc.cmd);
         status = -EOPNOTSUPP;
 
     }           // switch
 
     return status;
 }               // skfp_ioctl
 
 
 /*
  * =====================
  * = skfp_send_pkt     =
  * =====================
  *   
  * Overview:
  *   Queues a packet for transmission and try to transmit it.
  *  
  * Returns:
  *   Condition code
  *       
  * Arguments:
  *   skb - pointer to sk_buff to queue for transmission
  *   dev - pointer to device information
  *
  * Functional Description:
  *   Here we assume that an incoming skb transmit request
  *   is contained in a single physically contiguous buffer
  *   in which the virtual address of the start of packet
  *   (skb->data) can be converted to a physical address
  *   by using dma_map_single().
  *
  *   We have an internal queue for packets we can not send 
  *   immediately. Packets in this queue can be given to the 
  *   adapter if transmit buffers are freed.
  *
  *   We can't free the skb until after it's been DMA'd
  *   out by the adapter, so we'll keep it in the driver and
  *   return it in mac_drv_tx_complete.
  *
  * Return Codes:
  *   0 - driver has queued and/or sent packet
  *       1 - caller should requeue the sk_buff for later transmission
  *
  * Assumptions:
  *   The entire packet is stored in one physically
  *   contiguous buffer which is not cached and whose
  *   32-bit physical address can be determined.
  *
  *   It's vital that this routine is NOT reentered for the
  *   same board and that the OS is not in another section of
  *   code (eg. skfp_interrupt) for the same board on a
  *   different thread.
  *
  * Side Effects:
  *   None
  */
 static netdev_tx_t skfp_send_pkt(struct sk_buff *skb,
                        struct net_device *dev)
 {
     struct s_smc *smc = netdev_priv(dev);
     skfddi_priv *bp = &smc->os;
 
     pr_debug("skfp_send_pkt\n");
 
     /*
      * Verify that incoming transmit request is OK
      *
      * Note: The packet size check is consistent with other
      *               Linux device drivers, although the correct packet
      *               size should be verified before calling the
      *               transmit routine.
      */
 
     if (!(skb->len >= FDDI_K_LLC_ZLEN && skb->len <= FDDI_K_LLC_LEN)) {
         bp->MacStat.gen.tx_errors++;    /* bump error counter */
         // dequeue packets from xmt queue and send them
         netif_start_queue(dev);
         dev_kfree_skb(skb);
         return NETDEV_TX_OK;    /* return "success" */
     }
     if (bp->QueueSkb == 0) {    // return with tbusy set: queue full
 
         netif_stop_queue(dev);
         return NETDEV_TX_BUSY;
     }
     bp->QueueSkb--;
     skb_queue_tail(&bp->SendSkbQueue, skb);
     send_queued_packets(netdev_priv(dev));
     if (bp->QueueSkb == 0) {
         netif_stop_queue(dev);
     }
     return NETDEV_TX_OK;
 
 }               // skfp_send_pkt
 
 
 /*
  * =======================
  * = send_queued_packets =
  * =======================
  *   
  * Overview:
  *   Send packets from the driver queue as long as there are some and
  *   transmit resources are available.
  *  
  * Returns:
  *   None
  *       
  * Arguments:
  *   smc - pointer to smc (adapter) structure
  *
  * Functional Description:
  *   Take a packet from queue if there is any. If not, then we are done.
  *   Check if there are resources to send the packet. If not, requeue it
  *   and exit. 
  *   Set packet descriptor flags and give packet to adapter.
  *   Check if any send resources can be freed (we do not use the
  *   transmit complete interrupt).
  */
 static void send_queued_packets(struct s_smc *smc)
 {
     skfddi_priv *bp = &smc->os;
     struct sk_buff *skb;
     unsigned char fc;
     int queue;
     struct s_smt_fp_txd *txd;   // Current TxD.
     dma_addr_t dma_address;
     unsigned long Flags;
 
     int frame_status;   // HWM tx frame status.
 
     pr_debug("send queued packets\n");
     for (;;) {
         // send first buffer from queue
         skb = skb_dequeue(&bp->SendSkbQueue);
 
         if (!skb) {
             pr_debug("queue empty\n");
             return;
         }       // queue empty !
 
         spin_lock_irqsave(&bp->DriverLock, Flags);
         fc = skb->data[0];
         queue = (fc & FC_SYNC_BIT) ? QUEUE_S : QUEUE_A0;
 #ifdef ESS
         // Check if the frame may/must be sent as a synchronous frame.
 
         if ((fc & ~(FC_SYNC_BIT | FC_LLC_PRIOR)) == FC_ASYNC_LLC) {
             // It's an LLC frame.
             if (!smc->ess.sync_bw_available)
                 fc &= ~FC_SYNC_BIT; // No bandwidth available.
 
             else {  // Bandwidth is available.
 
                 if (smc->mib.fddiESSSynchTxMode) {
                     // Send as sync. frame.
                     fc |= FC_SYNC_BIT;
                 }
             }
         }
 #endif              // ESS
         frame_status = hwm_tx_init(smc, fc, 1, skb->len, queue);
 
         if ((frame_status & (LOC_TX | LAN_TX)) == 0) {
             // Unable to send the frame.
 
             if ((frame_status & RING_DOWN) != 0) {
                 // Ring is down.
                 pr_debug("Tx attempt while ring down.\n");
             } else if ((frame_status & OUT_OF_TXD) != 0) {
                 pr_debug("%s: out of TXDs.\n", bp->dev->name);
             } else {
                 pr_debug("%s: out of transmit resources",
                     bp->dev->name);
             }
 
             // Note: We will retry the operation as soon as
             // transmit resources become available.
             skb_queue_head(&bp->SendSkbQueue, skb);
             spin_unlock_irqrestore(&bp->DriverLock, Flags);
             return; // Packet has been queued.
 
         }       // if (unable to send frame)
 
         bp->QueueSkb++; // one packet less in local queue
 
         // source address in packet ?
         CheckSourceAddress(skb->data, smc->hw.fddi_canon_addr.a);
 
         txd = (struct s_smt_fp_txd *) HWM_GET_CURR_TXD(smc, queue);
 
         dma_address = dma_map_single(&(&bp->pdev)->dev, skb->data,
                          skb->len, DMA_TO_DEVICE);
         if (frame_status & LAN_TX) {
             txd->txd_os.skb = skb;          // save skb
             txd->txd_os.dma_addr = dma_address; // save dma mapping
         }
         hwm_tx_frag(smc, skb->data, dma_address, skb->len,
                       frame_status | FIRST_FRAG | LAST_FRAG | EN_IRQ_EOF);
 
         if (!(frame_status & LAN_TX)) {     // local only frame
             dma_unmap_single(&(&bp->pdev)->dev, dma_address,
                      skb->len, DMA_TO_DEVICE);
             dev_kfree_skb_irq(skb);
         }
         spin_unlock_irqrestore(&bp->DriverLock, Flags);
     }           // for
 
     return;         // never reached
 
 }               // send_queued_packets
 
 
 /************************
  * 
  * CheckSourceAddress
  *
  * Verify if the source address is set. Insert it if necessary.
  *
  ************************/
 static void CheckSourceAddress(unsigned char *frame, unsigned char *hw_addr)
 {
     unsigned char SRBit;
 
     if ((((unsigned long) frame[1 + 6]) & ~0x01) != 0) // source routing bit
 
         return;
     if ((unsigned short) frame[1 + 10] != 0)
         return;
     SRBit = frame[1 + 6] & 0x01;
     memcpy(&frame[1 + 6], hw_addr, ETH_ALEN);
     frame[8] |= SRBit;
 }               // CheckSourceAddress
 
 
 /************************
  *
  *  ResetAdapter
  *
  *  Reset the adapter and bring it back to operational mode.
  * Args
  *  smc - A pointer to the SMT context struct.
  * Out
  *  Nothing.
  *
  ************************/
 static void ResetAdapter(struct s_smc *smc)
 {
 
     pr_debug("[fddi: ResetAdapter]\n");
 
     // Stop the adapter.
 
     card_stop(smc);     // Stop all activity.
 
     // Clear the transmit and receive descriptor queues.
     mac_drv_clear_tx_queue(smc);
     mac_drv_clear_rx_queue(smc);
 
     // Restart the adapter.
 
     smt_reset_defaults(smc, 1); // Initialize the SMT module.
 
     init_smt(smc, (smc->os.dev)->dev_addr); // Initialize the hardware.
 
     smt_online(smc, 1); // Insert into the ring again.
     STI_FBI();
 
     // Restore original receive mode (multicasts, promiscuous, etc.).
     skfp_ctl_set_multicast_list_wo_lock(smc->os.dev);
 }               // ResetAdapter
 
 
 //--------------- functions called by hardware module ----------------
 
 /************************
  *
  *  llc_restart_tx
  *
  *  The hardware driver calls this routine when the transmit complete
  *  interrupt bits (end of frame) for the synchronous or asynchronous
  *  queue is set.
  *
  * NOTE The hardware driver calls this function also if no packets are queued.
  *  The routine must be able to handle this case.
  * Args
  *  smc - A pointer to the SMT context struct.
  * Out
  *  Nothing.
  *
  ************************/
 void llc_restart_tx(struct s_smc *smc)
 {
     skfddi_priv *bp = &smc->os;
 
     pr_debug("[llc_restart_tx]\n");
 
     // Try to send queued packets
     spin_unlock(&bp->DriverLock);
     send_queued_packets(smc);
     spin_lock(&bp->DriverLock);
     netif_start_queue(bp->dev);// system may send again if it was blocked
 
 }               // llc_restart_tx
 
 
 /************************
  *
  *  mac_drv_get_space
  *
  *  The hardware module calls this function to allocate the memory
  *  for the SMT MBufs if the define MB_OUTSIDE_SMC is specified.
  * Args
  *  smc - A pointer to the SMT context struct.
  *
  *  size - Size of memory in bytes to allocate.
  * Out
  *  != 0    A pointer to the virtual address of the allocated memory.
  *  == 0    Allocation error.
  *
  ************************/
 void *mac_drv_get_space(struct s_smc *smc, unsigned int size)
 {
     void *virt;
 
     pr_debug("mac_drv_get_space (%d bytes), ", size);
     virt = (void *) (smc->os.SharedMemAddr + smc->os.SharedMemHeap);
 
     if ((smc->os.SharedMemHeap + size) > smc->os.SharedMemSize) {
         printk("Unexpected SMT memory size requested: %d\n", size);
         return NULL;
     }
     smc->os.SharedMemHeap += size;  // Move heap pointer.
 
     pr_debug("mac_drv_get_space end\n");
     pr_debug("virt addr: %lx\n", (ulong) virt);
     pr_debug("bus  addr: %lx\n", (ulong)
            (smc->os.SharedMemDMA +
         ((char *) virt - (char *)smc->os.SharedMemAddr)));
     return virt;
 }               // mac_drv_get_space
 
 
 /************************
  *
  *  mac_drv_get_desc_mem
  *
  *  This function is called by the hardware dependent module.
  *  It allocates the memory for the RxD and TxD descriptors.
  *
  *  This memory must be non-cached, non-movable and non-swappable.
  *  This memory should start at a physical page boundary.
  * Args
  *  smc - A pointer to the SMT context struct.
  *
  *  size - Size of memory in bytes to allocate.
  * Out
  *  != 0    A pointer to the virtual address of the allocated memory.
  *  == 0    Allocation error.
  *
  ************************/
 void *mac_drv_get_desc_mem(struct s_smc *smc, unsigned int size)
 {
 
     char *virt;
 
     pr_debug("mac_drv_get_desc_mem\n");
 
     // Descriptor memory must be aligned on 16-byte boundary.
 
     virt = mac_drv_get_space(smc, size);
 
     size = (u_int) (16 - (((unsigned long) virt) & 15UL));
     size = size % 16;
 
     pr_debug("Allocate %u bytes alignment gap ", size);
     pr_debug("for descriptor memory.\n");
 
     if (!mac_drv_get_space(smc, size)) {
         printk("fddi: Unable to align descriptor memory.\n");
         return NULL;
     }
     return virt + size;
 }               // mac_drv_get_desc_mem
 
 
 /************************
  *
  *  mac_drv_virt2phys
  *
  *  Get the physical address of a given virtual address.
  * Args
  *  smc - A pointer to the SMT context struct.
  *
  *  virt - A (virtual) pointer into our 'shared' memory area.
  * Out
  *  Physical address of the given virtual address.
  *
  ************************/
 unsigned long mac_drv_virt2phys(struct s_smc *smc, void *virt)
 {
     return smc->os.SharedMemDMA +
         ((char *) virt - (char *)smc->os.SharedMemAddr);
 }               // mac_drv_virt2phys
 
 
 /************************
  *
  *  dma_master
  *
  *  The HWM calls this function, when the driver leads through a DMA
  *  transfer. If the OS-specific module must prepare the system hardware
  *  for the DMA transfer, it should do it in this function.
  *
  *  The hardware module calls this dma_master if it wants to send an SMT
  *  frame.  This means that the virt address passed in here is part of
  *      the 'shared' memory area.
  * Args
  *  smc - A pointer to the SMT context struct.
  *
  *  virt - The virtual address of the data.
  *
  *  len - The length in bytes of the data.
  *
  *  flag - Indicates the transmit direction and the buffer type:
  *      DMA_RD  (0x01)  system RAM ==> adapter buffer memory
  *      DMA_WR  (0x02)  adapter buffer memory ==> system RAM
  *      SMT_BUF (0x80)  SMT buffer
  *
  *  >> NOTE: SMT_BUF and DMA_RD are always set for PCI. <<
  * Out
  *  Returns the pyhsical address for the DMA transfer.
  *
  ************************/
 u_long dma_master(struct s_smc * smc, void *virt, int len, int flag)
 {
     return smc->os.SharedMemDMA +
         ((char *) virt - (char *)smc->os.SharedMemAddr);
 }               // dma_master
 
 
 /************************
  *
  *  dma_complete
  *
  *  The hardware module calls this routine when it has completed a DMA
  *  transfer. If the operating system dependent module has set up the DMA
  *  channel via dma_master() (e.g. Windows NT or AIX) it should clean up
  *  the DMA channel.
  * Args
  *  smc - A pointer to the SMT context struct.
  *
  *  descr - A pointer to a TxD or RxD, respectively.
  *
  *  flag - Indicates the DMA transfer direction / SMT buffer:
  *      DMA_RD  (0x01)  system RAM ==> adapter buffer memory
  *      DMA_WR  (0x02)  adapter buffer memory ==> system RAM
  *      SMT_BUF (0x80)  SMT buffer (managed by HWM)
  * Out
  *  Nothing.
  *
  ************************/
 void dma_complete(struct s_smc *smc, volatile union s_fp_descr *descr, int flag)
 {
     /* For TX buffers, there are two cases.  If it is an SMT transmit
      * buffer, there is nothing to do since we use consistent memory
      * for the 'shared' memory area.  The other case is for normal
      * transmit packets given to us by the networking stack, and in
      * that case we cleanup the PCI DMA mapping in mac_drv_tx_complete
      * below.
      *
      * For RX buffers, we have to unmap dynamic PCI DMA mappings here
      * because the hardware module is about to potentially look at
      * the contents of the buffer.  If we did not call the PCI DMA
      * unmap first, the hardware module could read inconsistent data.
      */
     if (flag & DMA_WR) {
         skfddi_priv *bp = &smc->os;
         volatile struct s_smt_fp_rxd *r = &descr->r;
 
         /* If SKB is NULL, we used the local buffer. */
         if (r->rxd_os.skb && r->rxd_os.dma_addr) {
             int MaxFrameSize = bp->MaxFrameSize;
 
             dma_unmap_single(&(&bp->pdev)->dev,
                      r->rxd_os.dma_addr, MaxFrameSize,
                      DMA_FROM_DEVICE);
             r->rxd_os.dma_addr = 0;
         }
     }
 }               // dma_complete
 
 
 /************************
  *
  *  mac_drv_tx_complete
  *
  *  Transmit of a packet is complete. Release the tx staging buffer.
  *
  * Args
  *  smc - A pointer to the SMT context struct.
  *
  *  txd - A pointer to the last TxD which is used by the frame.
  * Out
  *  Returns nothing.
  *
  ************************/
 void mac_drv_tx_complete(struct s_smc *smc, volatile struct s_smt_fp_txd *txd)
 {
     struct sk_buff *skb;
 
     pr_debug("entering mac_drv_tx_complete\n");
     // Check if this TxD points to a skb
 
     if (!(skb = txd->txd_os.skb)) {
         pr_debug("TXD with no skb assigned.\n");
         return;
     }
     txd->txd_os.skb = NULL;
 
     // release the DMA mapping
     dma_unmap_single(&(&smc->os.pdev)->dev, txd->txd_os.dma_addr,
              skb->len, DMA_TO_DEVICE);
     txd->txd_os.dma_addr = 0;
 
     smc->os.MacStat.gen.tx_packets++;   // Count transmitted packets.
     smc->os.MacStat.gen.tx_bytes+=skb->len; // Count bytes
 
     // free the skb
     dev_kfree_skb_irq(skb);
 
     pr_debug("leaving mac_drv_tx_complete\n");
 }               // mac_drv_tx_complete
 
 
 /************************
  *
  * dump packets to logfile
  *
  ************************/
 #ifdef DUMPPACKETS
 void dump_data(unsigned char *Data, int length)
 {
     printk(KERN_INFO "---Packet start---\n");
     print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1, Data, min_t(size_t, length, 64), false);
     printk(KERN_INFO "------------------\n");
 }               // dump_data
 #else
 #define dump_data(data,len)
 #endif              // DUMPPACKETS
 
 /************************
  *
  *  mac_drv_rx_complete
  *
  *  The hardware module calls this function if an LLC frame is received
  *  in a receive buffer. Also the SMT, NSA, and directed beacon frames
  *  from the network will be passed to the LLC layer by this function
  *  if passing is enabled.
  *
  *  mac_drv_rx_complete forwards the frame to the LLC layer if it should
  *  be received. It also fills the RxD ring with new receive buffers if
  *  some can be queued.
  * Args
  *  smc - A pointer to the SMT context struct.
  *
  *  rxd - A pointer to the first RxD which is used by the receive frame.
  *
  *  frag_count - Count of RxDs used by the received frame.
  *
  *  len - Frame length.
  * Out
  *  Nothing.
  *
  ************************/
 void mac_drv_rx_complete(struct s_smc *smc, volatile struct s_smt_fp_rxd *rxd,
              int frag_count, int len)
 {
     skfddi_priv *bp = &smc->os;
     struct sk_buff *skb;
     unsigned char *virt, *cp;
     unsigned short ri;
     u_int RifLength;
 
     pr_debug("entering mac_drv_rx_complete (len=%d)\n", len);
     if (frag_count != 1) {  // This is not allowed to happen.
 
         printk("fddi: Multi-fragment receive!\n");
         goto RequeueRxd;    // Re-use the given RXD(s).
 
     }
     skb = rxd->rxd_os.skb;
     if (!skb) {
         pr_debug("No skb in rxd\n");
         smc->os.MacStat.gen.rx_errors++;
         goto RequeueRxd;
     }
     virt = skb->data;
 
     // The DMA mapping was released in dma_complete above.
 
     dump_data(skb->data, len);
 
     /*
      * FDDI Frame format:
      * +-------+-------+-------+------------+--------+------------+
      * | FC[1] | DA[6] | SA[6] | RIF[0..18] | LLC[3] | Data[0..n] |
      * +-------+-------+-------+------------+--------+------------+
      *
      * FC = Frame Control
      * DA = Destination Address
      * SA = Source Address
      * RIF = Routing Information Field
      * LLC = Logical Link Control
      */
 
     // Remove Routing Information Field (RIF), if present.
 
     if ((virt[1 + 6] & FDDI_RII) == 0)
         RifLength = 0;
     else {
         int n;
 // goos: RIF removal has still to be tested
         pr_debug("RIF found\n");
         // Get RIF length from Routing Control (RC) field.
         cp = virt + FDDI_MAC_HDR_LEN;   // Point behind MAC header.
 
         ri = ntohs(*((__be16 *) cp));
         RifLength = ri & FDDI_RCF_LEN_MASK;
         if (len < (int) (FDDI_MAC_HDR_LEN + RifLength)) {
             printk("fddi: Invalid RIF.\n");
             goto RequeueRxd;    // Discard the frame.
 
         }
         virt[1 + 6] &= ~FDDI_RII;   // Clear RII bit.
         // regions overlap
 
         virt = cp + RifLength;
         for (n = FDDI_MAC_HDR_LEN; n; n--)
             *--virt = *--cp;
         // adjust sbd->data pointer
         skb_pull(skb, RifLength);
         len -= RifLength;
         RifLength = 0;
     }
 
     // Count statistics.
     smc->os.MacStat.gen.rx_packets++;   // Count indicated receive
                         // packets.
     smc->os.MacStat.gen.rx_bytes+=len;  // Count bytes.
 
     // virt points to header again
     if (virt[1] & 0x01) {   // Check group (multicast) bit.
 
         smc->os.MacStat.gen.multicast++;
     }
 
     // deliver frame to system
     rxd->rxd_os.skb = NULL;
     skb_trim(skb, len);
     skb->protocol = fddi_type_trans(skb, bp->dev);
 
     netif_rx(skb);
 
     HWM_RX_CHECK(smc, RX_LOW_WATERMARK);
     return;
 
       RequeueRxd:
     pr_debug("Rx: re-queue RXD.\n");
     mac_drv_requeue_rxd(smc, rxd, frag_count);
     smc->os.MacStat.gen.rx_errors++;    // Count receive packets
                         // not indicated.
 
 }               // mac_drv_rx_complete
 
 
 /************************
  *
  *  mac_drv_requeue_rxd
  *
  *  The hardware module calls this function to request the OS-specific
  *  module to queue the receive buffer(s) represented by the pointer
  *  to the RxD and the frag_count into the receive queue again. This
  *  buffer was filled with an invalid frame or an SMT frame.
  * Args
  *  smc - A pointer to the SMT context struct.
  *
  *  rxd - A pointer to the first RxD which is used by the receive frame.
  *
  *  frag_count - Count of RxDs used by the received frame.
  * Out
  *  Nothing.
  *
  ************************/
 void mac_drv_requeue_rxd(struct s_smc *smc, volatile struct s_smt_fp_rxd *rxd,
              int frag_count)
 {
     volatile struct s_smt_fp_rxd *next_rxd;
     volatile struct s_smt_fp_rxd *src_rxd;
     struct sk_buff *skb;
     int MaxFrameSize;
     unsigned char *v_addr;
     dma_addr_t b_addr;
 
     if (frag_count != 1)    // This is not allowed to happen.
 
         printk("fddi: Multi-fragment requeue!\n");
 
     MaxFrameSize = smc->os.MaxFrameSize;
     src_rxd = rxd;
     for (; frag_count > 0; frag_count--) {
         next_rxd = src_rxd->rxd_next;
         rxd = HWM_GET_CURR_RXD(smc);
 
         skb = src_rxd->rxd_os.skb;
         if (skb == NULL) {  // this should not happen
 
             pr_debug("Requeue with no skb in rxd!\n");
             skb = alloc_skb(MaxFrameSize + 3, GFP_ATOMIC);
             if (skb) {
                 // we got a skb
                 rxd->rxd_os.skb = skb;
                 skb_reserve(skb, 3);
                 skb_put(skb, MaxFrameSize);
                 v_addr = skb->data;
                 b_addr = dma_map_single(&(&smc->os.pdev)->dev,
                             v_addr, MaxFrameSize,
                             DMA_FROM_DEVICE);
                 rxd->rxd_os.dma_addr = b_addr;
             } else {
                 // no skb available, use local buffer
                 pr_debug("Queueing invalid buffer!\n");
                 rxd->rxd_os.skb = NULL;
                 v_addr = smc->os.LocalRxBuffer;
                 b_addr = smc->os.LocalRxBufferDMA;
             }
         } else {
             // we use skb from old rxd
             rxd->rxd_os.skb = skb;
             v_addr = skb->data;
             b_addr = dma_map_single(&(&smc->os.pdev)->dev, v_addr,
                         MaxFrameSize, DMA_FROM_DEVICE);
             rxd->rxd_os.dma_addr = b_addr;
         }
         hwm_rx_frag(smc, v_addr, b_addr, MaxFrameSize,
                 FIRST_FRAG | LAST_FRAG);
 
         src_rxd = next_rxd;
     }
 }               // mac_drv_requeue_rxd
 
 
 /************************
  *
  *  mac_drv_fill_rxd
  *
  *  The hardware module calls this function at initialization time
  *  to fill the RxD ring with receive buffers. It is also called by
  *  mac_drv_rx_complete if rx_free is large enough to queue some new
  *  receive buffers into the RxD ring. mac_drv_fill_rxd queues new
  *  receive buffers as long as enough RxDs and receive buffers are
  *  available.
  * Args
  *  smc - A pointer to the SMT context struct.
  * Out
  *  Nothing.
  *
  ************************/
 void mac_drv_fill_rxd(struct s_smc *smc)
 {
     int MaxFrameSize;
     unsigned char *v_addr;
     unsigned long b_addr;
     struct sk_buff *skb;
     volatile struct s_smt_fp_rxd *rxd;
 
     pr_debug("entering mac_drv_fill_rxd\n");
 
     // Walk through the list of free receive buffers, passing receive
     // buffers to the HWM as long as RXDs are available.
 
     MaxFrameSize = smc->os.MaxFrameSize;
     // Check if there is any RXD left.
     while (HWM_GET_RX_FREE(smc) > 0) {
         pr_debug(".\n");
 
         rxd = HWM_GET_CURR_RXD(smc);
         skb = alloc_skb(MaxFrameSize + 3, GFP_ATOMIC);
         if (skb) {
             // we got a skb
             skb_reserve(skb, 3);
             skb_put(skb, MaxFrameSize);
             v_addr = skb->data;
             b_addr = dma_map_single(&(&smc->os.pdev)->dev, v_addr,
                         MaxFrameSize, DMA_FROM_DEVICE);
             rxd->rxd_os.dma_addr = b_addr;
         } else {
             // no skb available, use local buffer
             // System has run out of buffer memory, but we want to
             // keep the receiver running in hope of better times.
             // Multiple descriptors may point to this local buffer,
             // so data in it must be considered invalid.
             pr_debug("Queueing invalid buffer!\n");
             v_addr = smc->os.LocalRxBuffer;
             b_addr = smc->os.LocalRxBufferDMA;
         }
 
         rxd->rxd_os.skb = skb;
 
         // Pass receive buffer to HWM.
         hwm_rx_frag(smc, v_addr, b_addr, MaxFrameSize,
                 FIRST_FRAG | LAST_FRAG);
     }
     pr_debug("leaving mac_drv_fill_rxd\n");
 }               // mac_drv_fill_rxd
 
 
 /************************
  *
  *  mac_drv_clear_rxd
  *
  *  The hardware module calls this function to release unused
  *  receive buffers.
  * Args
  *  smc - A pointer to the SMT context struct.
  *
  *  rxd - A pointer to the first RxD which is used by the receive buffer.
  *
  *  frag_count - Count of RxDs used by the receive buffer.
  * Out
  *  Nothing.
  *
  ************************/
 void mac_drv_clear_rxd(struct s_smc *smc, volatile struct s_smt_fp_rxd *rxd,
                int frag_count)
 {
 
     struct sk_buff *skb;
 
     pr_debug("entering mac_drv_clear_rxd\n");
 
     if (frag_count != 1)    // This is not allowed to happen.
 
         printk("fddi: Multi-fragment clear!\n");
 
     for (; frag_count > 0; frag_count--) {
         skb = rxd->rxd_os.skb;
         if (skb != NULL) {
             skfddi_priv *bp = &smc->os;
             int MaxFrameSize = bp->MaxFrameSize;
 
             dma_unmap_single(&(&bp->pdev)->dev,
                      rxd->rxd_os.dma_addr, MaxFrameSize,
                      DMA_FROM_DEVICE);
 
             dev_kfree_skb(skb);
             rxd->rxd_os.skb = NULL;
         }
         rxd = rxd->rxd_next;    // Next RXD.
 
     }
 }               // mac_drv_clear_rxd
 
 
 /************************
  *
  *  mac_drv_rx_init
  *
  *  The hardware module calls this routine when an SMT or NSA frame of the
  *  local SMT should be delivered to the LLC layer.
  *
  *  It is necessary to have this function, because there is no other way to
  *  copy the contents of SMT MBufs into receive buffers.
  *
  *  mac_drv_rx_init allocates the required target memory for this frame,
  *  and receives the frame fragment by fragment by calling mac_drv_rx_frag.
  * Args
  *  smc - A pointer to the SMT context struct.
  *
  *  len - The length (in bytes) of the received frame (FC, DA, SA, Data).
  *
  *  fc - The Frame Control field of the received frame.
  *
  *  look_ahead - A pointer to the lookahead data buffer (may be NULL).
  *
  *  la_len - The length of the lookahead data stored in the lookahead
  *  buffer (may be zero).
  * Out
  *  Always returns zero (0).
  *
  ************************/
 int mac_drv_rx_init(struct s_smc *smc, int len, int fc,
             char *look_ahead, int la_len)
 {
     struct sk_buff *skb;
 
     pr_debug("entering mac_drv_rx_init(len=%d)\n", len);
 
     // "Received" a SMT or NSA frame of the local SMT.
 
     if (len != la_len || len < FDDI_MAC_HDR_LEN || !look_ahead) {
         pr_debug("fddi: Discard invalid local SMT frame\n");
         pr_debug("  len=%d, la_len=%d, (ULONG) look_ahead=%08lXh.\n",
                len, la_len, (unsigned long) look_ahead);
         return 0;
     }
     skb = alloc_skb(len + 3, GFP_ATOMIC);
     if (!skb) {
         pr_debug("fddi: Local SMT: skb memory exhausted.\n");
         return 0;
     }
     skb_reserve(skb, 3);
     skb_put(skb, len);
     skb_copy_to_linear_data(skb, look_ahead, len);
 
     // deliver frame to system
     skb->protocol = fddi_type_trans(skb, smc->os.dev);
     netif_rx(skb);
 
     return 0;
 }               // mac_drv_rx_init
 
 
 /************************
  *
  *  smt_timer_poll
  *
  *  This routine is called periodically by the SMT module to clean up the
  *  driver.
  *
  *  Return any queued frames back to the upper protocol layers if the ring
  *  is down.
  * Args
  *  smc - A pointer to the SMT context struct.
  * Out
  *  Nothing.
  *
  ************************/
 void smt_timer_poll(struct s_smc *smc)
 {
 }               // smt_timer_poll
 
 
 /************************
  *
  *  ring_status_indication
  *
  *  This function indicates a change of the ring state.
  * Args
  *  smc - A pointer to the SMT context struct.
  *
  *  status - The current ring status.
  * Out
  *  Nothing.
  *
  ************************/
 void ring_status_indication(struct s_smc *smc, u_long status)
 {
     pr_debug("ring_status_indication( ");
     if (status & RS_RES15)
         pr_debug("RS_RES15 ");
     if (status & RS_HARDERROR)
         pr_debug("RS_HARDERROR ");
     if (status & RS_SOFTERROR)
         pr_debug("RS_SOFTERROR ");
     if (status & RS_BEACON)
         pr_debug("RS_BEACON ");
     if (status & RS_PATHTEST)
         pr_debug("RS_PATHTEST ");
     if (status & RS_SELFTEST)
         pr_debug("RS_SELFTEST ");
     if (status & RS_RES9)
         pr_debug("RS_RES9 ");
     if (status & RS_DISCONNECT)
         pr_debug("RS_DISCONNECT ");
     if (status & RS_RES7)
         pr_debug("RS_RES7 ");
     if (status & RS_DUPADDR)
         pr_debug("RS_DUPADDR ");
     if (status & RS_NORINGOP)
         pr_debug("RS_NORINGOP ");
     if (status & RS_VERSION)
         pr_debug("RS_VERSION ");
     if (status & RS_STUCKBYPASSS)
         pr_debug("RS_STUCKBYPASSS ");
     if (status & RS_EVENT)
         pr_debug("RS_EVENT ");
     if (status & RS_RINGOPCHANGE)
         pr_debug("RS_RINGOPCHANGE ");
     if (status & RS_RES0)
         pr_debug("RS_RES0 ");
     pr_debug("]\n");
 }               // ring_status_indication
 
 
 /************************
  *
  *  smt_get_time
  *
  *  Gets the current time from the system.
  * Args
  *  None.
  * Out
  *  The current time in TICKS_PER_SECOND.
  *
  *  TICKS_PER_SECOND has the unit 'count of timer ticks per second'. It is
  *  defined in "targetos.h". The definition of TICKS_PER_SECOND must comply
  *  to the time returned by smt_get_time().
  *
  ************************/
 unsigned long smt_get_time(void)
 {
     return jiffies;
 }               // smt_get_time
 
 
 /************************
  *
  *  smt_stat_counter
  *
  *  Status counter update (ring_op, fifo full).
  * Args
  *  smc - A pointer to the SMT context struct.
  *
  *  stat -  = 0: A ring operational change occurred.
  *      = 1: The FORMAC FIFO buffer is full / FIFO overflow.
  * Out
  *  Nothing.
  *
  ************************/
 void smt_stat_counter(struct s_smc *smc, int stat)
 {
 //      BOOLEAN RingIsUp ;
 
     pr_debug("smt_stat_counter\n");
     switch (stat) {
     case 0:
         pr_debug("Ring operational change.\n");
         break;
     case 1:
         pr_debug("Receive fifo overflow.\n");
         smc->os.MacStat.gen.rx_errors++;
         break;
     default:
         pr_debug("Unknown status (%d).\n", stat);
         break;
     }
 }               // smt_stat_counter
 
 
 /************************
  *
  *  cfm_state_change
  *
  *  Sets CFM state in custom statistics.
  * Args
  *  smc - A pointer to the SMT context struct.
  *
  *  c_state - Possible values are:
  *
  *      EC0_OUT, EC1_IN, EC2_TRACE, EC3_LEAVE, EC4_PATH_TEST,
  *      EC5_INSERT, EC6_CHECK, EC7_DEINSERT
  * Out
  *  Nothing.
  *
  ************************/
 void cfm_state_change(struct s_smc *smc, int c_state)
 {
 #ifdef DRIVERDEBUG
     char *s;
 
     switch (c_state) {
     case SC0_ISOLATED:
         s = "SC0_ISOLATED";
         break;
     case SC1_WRAP_A:
         s = "SC1_WRAP_A";
         break;
     case SC2_WRAP_B:
         s = "SC2_WRAP_B";
         break;
     case SC4_THRU_A:
         s = "SC4_THRU_A";
         break;
     case SC5_THRU_B:
         s = "SC5_THRU_B";
         break;
     case SC7_WRAP_S:
         s = "SC7_WRAP_S";
         break;
     case SC9_C_WRAP_A:
         s = "SC9_C_WRAP_A";
         break;
     case SC10_C_WRAP_B:
         s = "SC10_C_WRAP_B";
         break;
     case SC11_C_WRAP_S:
         s = "SC11_C_WRAP_S";
         break;
     default:
         pr_debug("cfm_state_change: unknown %d\n", c_state);
         return;
     }
     pr_debug("cfm_state_change: %s\n", s);
 #endif              // DRIVERDEBUG
 }               // cfm_state_change
 
 
 /************************
  *
  *  ecm_state_change
  *
  *  Sets ECM state in custom statistics.
  * Args
  *  smc - A pointer to the SMT context struct.
  *
  *  e_state - Possible values are:
  *
  *      SC0_ISOLATED, SC1_WRAP_A (5), SC2_WRAP_B (6), SC4_THRU_A (12),
  *      SC5_THRU_B (7), SC7_WRAP_S (8)
  * Out
  *  Nothing.
  *
  ************************/
 void ecm_state_change(struct s_smc *smc, int e_state)
 {
 #ifdef DRIVERDEBUG
     char *s;
 
     switch (e_state) {
     case EC0_OUT:
         s = "EC0_OUT";
         break;
     case EC1_IN:
         s = "EC1_IN";
         break;
     case EC2_TRACE:
         s = "EC2_TRACE";
         break;
     case EC3_LEAVE:
         s = "EC3_LEAVE";
         break;
     case EC4_PATH_TEST:
         s = "EC4_PATH_TEST";
         break;
     case EC5_INSERT:
         s = "EC5_INSERT";
         break;
     case EC6_CHECK:
         s = "EC6_CHECK";
         break;
     case EC7_DEINSERT:
         s = "EC7_DEINSERT";
         break;
     default:
         s = "unknown";
         break;
     }
     pr_debug("ecm_state_change: %s\n", s);
 #endif              //DRIVERDEBUG
 }               // ecm_state_change
 
 
 /************************
  *
  *  rmt_state_change
  *
  *  Sets RMT state in custom statistics.
  * Args
  *  smc - A pointer to the SMT context struct.
  *
  *  r_state - Possible values are:
  *
  *      RM0_ISOLATED, RM1_NON_OP, RM2_RING_OP, RM3_DETECT,
  *      RM4_NON_OP_DUP, RM5_RING_OP_DUP, RM6_DIRECTED, RM7_TRACE
  * Out
  *  Nothing.
  *
  ************************/
 void rmt_state_change(struct s_smc *smc, int r_state)
 {
 #ifdef DRIVERDEBUG
     char *s;
 
     switch (r_state) {
     case RM0_ISOLATED:
         s = "RM0_ISOLATED";
         break;
     case RM1_NON_OP:
         s = "RM1_NON_OP - not operational";
         break;
     case RM2_RING_OP:
         s = "RM2_RING_OP - ring operational";
         break;
     case RM3_DETECT:
         s = "RM3_DETECT - detect dupl addresses";
         break;
     case RM4_NON_OP_DUP:
         s = "RM4_NON_OP_DUP - dupl. addr detected";
         break;
     case RM5_RING_OP_DUP:
         s = "RM5_RING_OP_DUP - ring oper. with dupl. addr";
         break;
     case RM6_DIRECTED:
         s = "RM6_DIRECTED - sending directed beacons";
         break;
     case RM7_TRACE:
         s = "RM7_TRACE - trace initiated";
         break;
     default:
         s = "unknown";
         break;
     }
     pr_debug("[rmt_state_change: %s]\n", s);
 #endif              // DRIVERDEBUG
 }               // rmt_state_change
 
 
 /************************
  *
  *  drv_reset_indication
  *
  *  This function is called by the SMT when it has detected a severe
  *  hardware problem. The driver should perform a reset on the adapter
  *  as soon as possible, but not from within this function.
  * Args
  *  smc - A pointer to the SMT context struct.
  * Out
  *  Nothing.
  *
  ************************/
 void drv_reset_indication(struct s_smc *smc)
 {
     pr_debug("entering drv_reset_indication\n");
 
     smc->os.ResetRequested = TRUE;  // Set flag.
 
 }               // drv_reset_indication
 
 static struct pci_driver skfddi_pci_driver = {
     .name       = "skfddi",
     .id_table   = skfddi_pci_tbl,
     .probe      = skfp_init_one,
     .remove     = skfp_remove_one,
 };
 
 module_pci_driver(skfddi_pci_driver);

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