Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2293 insertions, 0 deletions

diff --git a/drivers/net/skfp/skfddi.c b/drivers/net/skfp/skfddi.c
new file mode 100644
index 0000000..c88aad6
--- /dev/null
+++ b/drivers/net/skfp/skfddi.c
@@ -0,0 +1,2293 @@
+/*
+ * File Name:
+ *   skfddi.c
+ *
+ * Copyright Information:
+ *   Copyright SysKonnect 1998,1999.
+ *
+ * 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.
+ *
+ * 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 fuctions 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 *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/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/netdevice.h>
+#include <linux/fddidevice.h>
+#include <linux/skbuff.h>
+#include <linux/bitops.h>
+
+#include <asm/byteorder.h>
+#include <asm/io.h>
+#include <asm/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, struct pt_regs *regs);
+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_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
+static int 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 void read_address(struct s_smc *smc, u_char * mac_addr);
+extern void card_stop(struct s_smc *smc);
+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 int init_smt(struct s_smc *smc, u_char * mac_addr);
+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);
+extern void mac_drv_clear_txd(struct s_smc *smc);
+
+static 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 */
+
+#ifdef DRIVERDEBUG
+#define PRINTK(s, args...) printk(s, ## args)
+#else
+#define PRINTK(s, args...)
+#endif				// DRIVERDEBUG
+
+/*
+ * =================
+ * = 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;
+
+	PRINTK(KERN_INFO "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->get_stats = &skfp_ctl_get_stats;
+	dev->open = &skfp_open;
+	dev->stop = &skfp_close;
+	dev->hard_start_xmit = &skfp_send_pkt;
+	dev->set_multicast_list = &skfp_ctl_set_multicast_list;
+	dev->set_mac_address = &skfp_ctl_set_mac_address;
+	dev->do_ioctl = &skfp_ioctl;
+	dev->header_cache_update = NULL;	/* not supported */
+
+	SET_MODULE_OWNER(dev);
+	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) 
+		pci_free_consistent(pdev, smc->os.SharedMemSize,
+				    smc->os.SharedMemAddr, 
+				    smc->os.SharedMemDMA);
+	pci_free_consistent(pdev, 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 __devexit 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) {
+		pci_free_consistent(&lp->os.pdev,
+				    lp->os.SharedMemSize,
+				    lp->os.SharedMemAddr,
+				    lp->os.SharedMemDMA);
+		lp->os.SharedMemAddr = NULL;
+	}
+	if (lp->os.LocalRxBuffer) {
+		pci_free_consistent(&lp->os.pdev,
+				    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);
+	pci_set_drvdata(pdev, NULL);
+}
+
+/*
+ * ====================
+ * = 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;
+
+	PRINTK(KERN_INFO "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 = pci_alloc_consistent(&bp->pdev, MAX_FRAME_SIZE, &bp->LocalRxBufferDMA);
+	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();
+	PRINTK(KERN_INFO "Memory for HWM: %ld\n", bp->SharedMemSize);
+	if (bp->SharedMemSize > 0) {
+		bp->SharedMemSize += 16;	// for descriptor alignment
+
+		bp->SharedMemAddr = pci_alloc_consistent(&bp->pdev,
+							 bp->SharedMemSize,
+							 &bp->SharedMemDMA);
+		if (!bp->SharedMemSize) {
+			printk("could not allocate mem for ");
+			printk("hardware module: %ld byte\n",
+			       bp->SharedMemSize);
+			goto fail;
+		}
+		bp->SharedMemHeap = 0;	// Nothing used yet.
+
+	} else {
+		bp->SharedMemAddr = NULL;
+		bp->SharedMemHeap = 0;
+	}			// SharedMemSize > 0
+
+	memset(bp->SharedMemAddr, 0, bp->SharedMemSize);
+
+	card_stop(smc);		// Reset adapter.
+
+	PRINTK(KERN_INFO "mac_drv_init()..\n");
+	if (mac_drv_init(smc) != 0) {
+		PRINTK(KERN_INFO "mac_drv_init() failed.\n");
+		goto fail;
+	}
+	read_address(smc, NULL);
+	PRINTK(KERN_INFO "HW-Addr: %02x %02x %02x %02x %02x %02x\n",
+	       smc->hw.fddi_canon_addr.a[0],
+	       smc->hw.fddi_canon_addr.a[1],
+	       smc->hw.fddi_canon_addr.a[2],
+	       smc->hw.fddi_canon_addr.a[3],
+	       smc->hw.fddi_canon_addr.a[4],
+	       smc->hw.fddi_canon_addr.a[5]);
+	memcpy(dev->dev_addr, smc->hw.fddi_canon_addr.a, 6);
+
+	smt_reset_defaults(smc, 0);
+
+	return (0);
+
+fail:
+	if (bp->SharedMemAddr) {
+		pci_free_consistent(&bp->pdev,
+				    bp->SharedMemSize,
+				    bp->SharedMemAddr,
+				    bp->SharedMemDMA);
+		bp->SharedMemAddr = NULL;
+	}
+	if (bp->LocalRxBuffer) {
+		pci_free_consistent(&bp->pdev, 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;
+
+	PRINTK(KERN_INFO "entering skfp_open\n");
+	/* Register IRQ - support shared interrupts by passing device ptr */
+	err = request_irq(dev->irq, (void *) skfp_interrupt, SA_SHIRQ,
+			  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);
+	memcpy(dev->dev_addr, smc->hw.fddi_canon_addr.a, 6);
+
+	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
+ *       regs   - pointer to registers structure
+ *
+ * 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.
+ */
+
+irqreturn_t skfp_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct net_device *dev = (struct net_device *) dev_id;
+	struct s_smc *smc;	/* private board structure pointer */
+	skfddi_priv *bp;
+
+	if (dev == NULL) {
+		printk("%s: irq %d for unknown device\n", dev->name, irq);
+		return IRQ_NONE;
+	}
+
+	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.
+ *
+ */
+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);
+	return;
+}				// 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 dev_mc_list *dmi;	/* ptr to multicast addr entry */
+	int i;
+
+	/* Enable promiscuous mode, if necessary */
+	if (dev->flags & IFF_PROMISC) {
+		mac_drv_rx_mode(smc, RX_ENABLE_PROMISC);
+		PRINTK(KERN_INFO "PROMISCUOUS MODE ENABLED\n");
+	}
+	/* Else, update multicast address table */
+	else {
+		mac_drv_rx_mode(smc, RX_DISABLE_PROMISC);
+		PRINTK(KERN_INFO "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);
+			PRINTK(KERN_INFO "ENABLE ALL MC ADDRESSES\n");
+		} else if (dev->mc_count > 0) {
+			if (dev->mc_count <= FPMAX_MULTICAST) {
+				/* use exact filtering */
+
+				// point to first multicast addr
+				dmi = dev->mc_list;
+
+				for (i = 0; i < dev->mc_count; i++) {
+					mac_add_multicast(smc, 
+							  (struct fddi_addr *)dmi->dmi_addr, 
+							  1);
+
+					PRINTK(KERN_INFO "ENABLE MC ADDRESS:");
+					PRINTK(" %02x %02x %02x ",
+					       dmi->dmi_addr[0],
+					       dmi->dmi_addr[1],
+					       dmi->dmi_addr[2]);
+					PRINTK("%02x %02x %02x\n",
+					       dmi->dmi_addr[3],
+					       dmi->dmi_addr[4],
+					       dmi->dmi_addr[5]);
+					dmi = dmi->next;
+				}	// for
+
+			} else {	// more MC addresses than HW supports
+
+				mac_drv_rx_mode(smc, RX_ENABLE_ALLMULTI);
+				PRINTK(KERN_INFO "ENABLE ALL MC ADDRESSES\n");
+			}
+		} else {	// no MC addresses
+
+			PRINTK(KERN_INFO "DISABLE ALL MC ADDRESSES\n");
+		}
+
+		/* Update adapter filters */
+		mac_update_multicast(smc);
+	}
+	return;
+}				// 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;
+
+
+	memcpy(dev->dev_addr, p_sockaddr->sa_data, FDDI_K_ALEN);
+	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_ioctl =
+ * ==============
+ *   
+ * 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_ioctl(struct net_device *dev, struct ifreq *rq, 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, rq->ifr_data, sizeof(struct s_skfp_ioctl)))
+		return -EFAULT;
+
+	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)) {
+			memset(&lp->MacStat, 0, sizeof(lp->MacStat));
+		} else {
+			status = -EPERM;
+		}
+		break;
+	default:
+		printk("ioctl for %s: unknow 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 pci_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 int skfp_send_pkt(struct sk_buff *skb, struct net_device *dev)
+{
+	struct s_smc *smc = netdev_priv(dev);
+	skfddi_priv *bp = &smc->os;
+
+	PRINTK(KERN_INFO "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 (0);	/* return "success" */
+	}
+	if (bp->QueueSkb == 0) {	// return with tbusy set: queue full
+
+		netif_stop_queue(dev);
+		return 1;
+	}
+	bp->QueueSkb--;
+	skb_queue_tail(&bp->SendSkbQueue, skb);
+	send_queued_packets(netdev_priv(dev));
+	if (bp->QueueSkb == 0) {
+		netif_stop_queue(dev);
+	}
+	dev->trans_start = jiffies;
+	return 0;
+
+}				// 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.
+
+	PRINTK(KERN_INFO "send queued packets\n");
+	for (;;) {
+		// send first buffer from queue
+		skb = skb_dequeue(&bp->SendSkbQueue);
+
+		if (!skb) {
+			PRINTK(KERN_INFO "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.
+				PRINTK("Tx attempt while ring down.\n");
+			} else if ((frame_status & OUT_OF_TXD) != 0) {
+				PRINTK("%s: out of TXDs.\n", bp->dev->name);
+			} else {
+				PRINTK("%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 = pci_map_single(&bp->pdev, skb->data,
+					     skb->len, PCI_DMA_TODEVICE);
+		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
+			pci_unmap_single(&bp->pdev, dma_address,
+					 skb->len, PCI_DMA_TODEVICE);
+			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.
+ *
+ ************************/
+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, 6);
+	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)
+{
+
+	PRINTK(KERN_INFO "[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;
+
+	PRINTK(KERN_INFO "[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;
+
+	PRINTK(KERN_INFO "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.
+
+	PRINTK(KERN_INFO "mac_drv_get_space end\n");
+	PRINTK(KERN_INFO "virt addr: %lx\n", (ulong) virt);
+	PRINTK(KERN_INFO "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;
+
+	PRINTK(KERN_INFO "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;
+
+	PRINTK("Allocate %u bytes alignment gap ", size);
+	PRINTK("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;
+
+			pci_unmap_single(&bp->pdev, r->rxd_os.dma_addr,
+					 MaxFrameSize, PCI_DMA_FROMDEVICE);
+			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;
+
+	PRINTK(KERN_INFO "entering mac_drv_tx_complete\n");
+	// Check if this TxD points to a skb
+
+	if (!(skb = txd->txd_os.skb)) {
+		PRINTK("TXD with no skb assigned.\n");
+		return;
+	}
+	txd->txd_os.skb = NULL;
+
+	// release the DMA mapping
+	pci_unmap_single(&smc->os.pdev, txd->txd_os.dma_addr,
+			 skb->len, PCI_DMA_TODEVICE);
+	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);
+
+	PRINTK(KERN_INFO "leaving mac_drv_tx_complete\n");
+}				// mac_drv_tx_complete
+
+
+/************************
+ *
+ * dump packets to logfile
+ *
+ ************************/
+#ifdef DUMPPACKETS
+void dump_data(unsigned char *Data, int length)
+{
+	int i, j;
+	unsigned char s[255], sh[10];
+	if (length > 64) {
+		length = 64;
+	}
+	printk(KERN_INFO "---Packet start---\n");
+	for (i = 0, j = 0; i < length / 8; i++, j += 8)
+		printk(KERN_INFO "%02x %02x %02x %02x %02x %02x %02x %02x\n",
+		       Data[j + 0], Data[j + 1], Data[j + 2], Data[j + 3],
+		       Data[j + 4], Data[j + 5], Data[j + 6], Data[j + 7]);
+	strcpy(s, "");
+	for (i = 0; i < length % 8; i++) {
+		sprintf(sh, "%02x ", Data[j + i]);
+		strcat(s, sh);
+	}
+	printk(KERN_INFO "%s\n", s);
+	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;
+
+	PRINTK(KERN_INFO "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) {
+		PRINTK(KERN_INFO "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
+		PRINTK(KERN_INFO "RIF found\n");
+		// Get RIF length from Routing Control (RC) field.
+		cp = virt + FDDI_MAC_HDR_LEN;	// Point behind MAC header.
+
+		ri = ntohs(*((unsigned short *) 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);
+	skb->dev = bp->dev;	/* pass up device pointer */
+
+	netif_rx(skb);
+	bp->dev->last_rx = jiffies;
+
+	HWM_RX_CHECK(smc, RX_LOW_WATERMARK);
+	return;
+
+      RequeueRxd:
+	PRINTK(KERN_INFO "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
+
+			PRINTK("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 = pci_map_single(&smc->os.pdev,
+							v_addr,
+							MaxFrameSize,
+							PCI_DMA_FROMDEVICE);
+				rxd->rxd_os.dma_addr = b_addr;
+			} else {
+				// no skb available, use local buffer
+				PRINTK("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 = pci_map_single(&smc->os.pdev,
+						v_addr,
+						MaxFrameSize,
+						PCI_DMA_FROMDEVICE);
+			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;
+
+	PRINTK(KERN_INFO "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) {
+		PRINTK(KERN_INFO ".\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 = pci_map_single(&smc->os.pdev,
+						v_addr,
+						MaxFrameSize,
+						PCI_DMA_FROMDEVICE);
+			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.
+			PRINTK("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);
+	}
+	PRINTK(KERN_INFO "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;
+
+	PRINTK("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;
+
+			pci_unmap_single(&bp->pdev, rxd->rxd_os.dma_addr,
+					 MaxFrameSize, PCI_DMA_FROMDEVICE);
+
+			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;
+
+	PRINTK("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) {
+		PRINTK("fddi: Discard invalid local SMT frame\n");
+		PRINTK("  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) {
+		PRINTK("fddi: Local SMT: skb memory exhausted.\n");
+		return (0);
+	}
+	skb_reserve(skb, 3);
+	skb_put(skb, len);
+	memcpy(skb->data, look_ahead, len);
+
+	// deliver frame to system
+	skb->protocol = fddi_type_trans(skb, smc->os.dev);
+	skb->dev->last_rx = jiffies;
+	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)
+{
+	PRINTK("ring_status_indication( ");
+	if (status & RS_RES15)
+		PRINTK("RS_RES15 ");
+	if (status & RS_HARDERROR)
+		PRINTK("RS_HARDERROR ");
+	if (status & RS_SOFTERROR)
+		PRINTK("RS_SOFTERROR ");
+	if (status & RS_BEACON)
+		PRINTK("RS_BEACON ");
+	if (status & RS_PATHTEST)
+		PRINTK("RS_PATHTEST ");
+	if (status & RS_SELFTEST)
+		PRINTK("RS_SELFTEST ");
+	if (status & RS_RES9)
+		PRINTK("RS_RES9 ");
+	if (status & RS_DISCONNECT)
+		PRINTK("RS_DISCONNECT ");
+	if (status & RS_RES7)
+		PRINTK("RS_RES7 ");
+	if (status & RS_DUPADDR)
+		PRINTK("RS_DUPADDR ");
+	if (status & RS_NORINGOP)
+		PRINTK("RS_NORINGOP ");
+	if (status & RS_VERSION)
+		PRINTK("RS_VERSION ");
+	if (status & RS_STUCKBYPASSS)
+		PRINTK("RS_STUCKBYPASSS ");
+	if (status & RS_EVENT)
+		PRINTK("RS_EVENT ");
+	if (status & RS_RINGOPCHANGE)
+		PRINTK("RS_RINGOPCHANGE ");
+	if (status & RS_RES0)
+		PRINTK("RS_RES0 ");
+	PRINTK("]\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 ;
+
+	PRINTK(KERN_INFO "smt_stat_counter\n");
+	switch (stat) {
+	case 0:
+		PRINTK(KERN_INFO "Ring operational change.\n");
+		break;
+	case 1:
+		PRINTK(KERN_INFO "Receive fifo overflow.\n");
+		smc->os.MacStat.gen.rx_errors++;
+		break;
+	default:
+		PRINTK(KERN_INFO "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:
+		PRINTK(KERN_INFO "cfm_state_change: unknown %d\n", c_state);
+		return;
+	}
+	PRINTK(KERN_INFO "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;
+	}
+	PRINTK(KERN_INFO "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;
+	}
+	PRINTK(KERN_INFO "[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)
+{
+	PRINTK(KERN_INFO "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		= __devexit_p(skfp_remove_one),
+};
+
+static int __init skfd_init(void)
+{
+	return pci_module_init(&skfddi_pci_driver);
+}
+
+static void __exit skfd_exit(void)
+{
+	pci_unregister_driver(&skfddi_pci_driver);
+}
+
+module_init(skfd_init);
+module_exit(skfd_exit);