Merge commit '06307114472bd8aad5ff18ccdb8e25f128ae6652'

[unleashed.git] / kernel / drivers / net / vr / vr.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <sys/types.h>
#include <sys/stream.h>
#include <sys/strsun.h>
#include <sys/stat.h>
#include <sys/pci.h>
#include <sys/modctl.h>
#include <sys/kstat.h>
#include <sys/ethernet.h>
#include <sys/devops.h>
#include <sys/debug.h>
#include <sys/conf.h>
#include <sys/mac.h>
#include <sys/mac_provider.h>
#include <sys/mac_ether.h>
#include <sys/sysmacros.h>
#include <sys/dditypes.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/miiregs.h>
#include <sys/byteorder.h>
#include <sys/note.h>
#include <sys/vlan.h>

#include "vr.h"
#include "vr_impl.h"

/*
 * VR in a nutshell
 * The card uses two rings of data structures to communicate with the host.
 * These are referred to as "descriptor rings" and there is one for transmit
 * (TX) and one for receive (RX).
 *
 * The driver uses a "DMA buffer" data type for mapping to those descriptor
 * rings. This is a structure with handles and a DMA'able buffer attached to it.
 *
 * Receive
 * The receive ring is filled with DMA buffers. Received packets are copied into
 * a newly allocated mblk's and passed upstream.
 *
 * Transmit
 * Each transmit descriptor has a DMA buffer attached to it. The data of TX
 * packets is copied into the DMA buffer which is then enqueued for
 * transmission.
 *
 * Reclaim of transmitted packets is done as a result of a transmit completion
 * interrupt which is generated 3 times per ring at minimum.
 */

#if defined(DEBUG)
uint32_t        vrdebug = 1;
#define VR_DEBUG(args)  do {                            \
                if (vrdebug > 0)                        \
                        (*vr_debug()) args;             \
                        _NOTE(CONSTANTCONDITION)        \
                } while (0)
static  void    vr_prt(const char *fmt, ...);
        void    (*vr_debug())(const char *fmt, ...);
#else
#define VR_DEBUG(args)  do ; _NOTE(CONSTANTCONDITION) while (0)
#endif

static char vr_ident[] = "VIA Rhine Ethernet";

/*
 * Attributes for accessing registers and memory descriptors for this device.
 */
static ddi_device_acc_attr_t vr_dev_dma_accattr = {
        DDI_DEVICE_ATTR_V0,
        DDI_STRUCTURE_LE_ACC,
        DDI_STRICTORDER_ACC
};

/*
 * Attributes for accessing data.
 */
static ddi_device_acc_attr_t vr_data_dma_accattr = {
        DDI_DEVICE_ATTR_V0,
        DDI_NEVERSWAP_ACC,
        DDI_STRICTORDER_ACC
};

/*
 * DMA attributes for descriptors for communication with the device
 * This driver assumes that all descriptors of one ring fit in one consequitive
 * memory area of max 4K (256 descriptors) that does not cross a page boundary.
 * Therefore, we request 4K alignement.
 */
static ddi_dma_attr_t vr_dev_dma_attr = {
        DMA_ATTR_V0,                    /* version number */
        0,                              /* low DMA address range */
        0xFFFFFFFF,                     /* high DMA address range */
        0x7FFFFFFF,                     /* DMA counter register */
        0x1000,                         /* DMA address alignment */
        0x7F,                           /* DMA burstsizes */
        1,                              /* min effective DMA size */
        0xFFFFFFFF,                     /* max DMA xfer size */
        0xFFFFFFFF,                     /* segment boundary */
        1,                              /* s/g list length */
        1,                              /* granularity of device */
        0                               /* DMA transfer flags */
};

/*
 * DMA attributes for the data moved to/from the device
 * Note that the alignement is set to 2K so hat a 1500 byte packet never
 * crosses a page boundary and thus that a DMA transfer is not split up in
 * multiple cookies with a 4K/8K pagesize
 */
static ddi_dma_attr_t vr_data_dma_attr = {
        DMA_ATTR_V0,                    /* version number */
        0,                              /* low DMA address range */
        0xFFFFFFFF,                     /* high DMA address range */
        0x7FFFFFFF,                     /* DMA counter register */
        0x800,                          /* DMA address alignment */
        0xfff,                          /* DMA burstsizes */
        1,                              /* min effective DMA size */
        0xFFFFFFFF,                     /* max DMA xfer size */
        0xFFFFFFFF,                     /* segment boundary */
        1,                              /* s/g list length */
        1,                              /* granularity of device */
        0                               /* DMA transfer flags */
};

static mac_callbacks_t vr_mac_callbacks = {
        MC_SETPROP|MC_GETPROP|MC_PROPINFO, /* Which callbacks are set */
        vr_mac_getstat,         /* Get the value of a statistic */
        vr_mac_start,           /* Start the device */
        vr_mac_stop,            /* Stop the device */
        vr_mac_set_promisc,     /* Enable or disable promiscuous mode */
        vr_mac_set_multicast,   /* Enable or disable a multicast addr */
        vr_mac_set_ether_addr,  /* Set the unicast MAC address */
        vr_mac_tx_enqueue_list, /* Transmit a packet */
        NULL,
        NULL,                   /* Process an unknown ioctl */
        NULL,                   /* Get capability information */
        NULL,                   /* Open the device */
        NULL,                   /* Close the device */
        vr_mac_setprop,         /* Set properties of the device */
        vr_mac_getprop,         /* Get properties of the device */
        vr_mac_propinfo         /* Get properties attributes */
};

/*
 * Table with bugs and features for each incarnation of the card.
 */
static const chip_info_t vr_chip_info [] = {
        {
                0x0, 0x0,
                "VIA Rhine Fast Ethernet",
                (VR_BUG_NO_MEMIO),
                (VR_FEATURE_NONE)
        },
        {
                0x04, 0x21,
                "VIA VT86C100A Fast Ethernet",
                (VR_BUG_NEEDMODE2PCEROPT | VR_BUG_NO_TXQUEUEING |
                    VR_BUG_NEEDMODE10T | VR_BUG_TXALIGN | VR_BUG_NO_MEMIO |
                    VR_BUG_MIIPOLLSTOP),
                (VR_FEATURE_NONE)
        },
        {
                0x40, 0x41,
                "VIA VT6102-A Rhine II Fast Ethernet",
                (VR_BUG_NEEDMODE2PCEROPT),
                (VR_FEATURE_RX_PAUSE_CAP)
        },
        {
                0x42, 0x7f,
                "VIA VT6102-C Rhine II Fast Ethernet",
                (VR_BUG_NEEDMODE2PCEROPT),
                (VR_FEATURE_RX_PAUSE_CAP)
        },
        {
                0x80, 0x82,
                "VIA VT6105-A Rhine III Fast Ethernet",
                (VR_BUG_NONE),
                (VR_FEATURE_RX_PAUSE_CAP | VR_FEATURE_TX_PAUSE_CAP)
        },
        {
                0x83, 0x89,
                "VIA VT6105-B Rhine III Fast Ethernet",
                (VR_BUG_NONE),
                (VR_FEATURE_RX_PAUSE_CAP | VR_FEATURE_TX_PAUSE_CAP)
        },
        {
                0x8a, 0x8b,
                "VIA VT6105-LOM Rhine III Fast Ethernet",
                (VR_BUG_NONE),
                (VR_FEATURE_RX_PAUSE_CAP | VR_FEATURE_TX_PAUSE_CAP)
        },
        {
                0x8c, 0x8c,
                "VIA VT6107-A0 Rhine III Fast Ethernet",
                (VR_BUG_NONE),
                (VR_FEATURE_RX_PAUSE_CAP | VR_FEATURE_TX_PAUSE_CAP)
        },
        {
                0x8d, 0x8f,
                "VIA VT6107-A1 Rhine III Fast Ethernet",
                (VR_BUG_NONE),
                (VR_FEATURE_RX_PAUSE_CAP | VR_FEATURE_TX_PAUSE_CAP |
                    VR_FEATURE_MRDLNMULTIPLE)
        },
        {
                0x90, 0x93,
                "VIA VT6105M-A0 Rhine III Fast Ethernet Management Adapter",
                (VR_BUG_NONE),
                (VR_FEATURE_RX_PAUSE_CAP | VR_FEATURE_TX_PAUSE_CAP |
                    VR_FEATURE_TXCHKSUM | VR_FEATURE_RXCHKSUM |
                    VR_FEATURE_CAMSUPPORT | VR_FEATURE_VLANTAGGING |
                    VR_FEATURE_MIBCOUNTER)
        },
        {
                0x94, 0xff,
                "VIA VT6105M-B1 Rhine III Fast Ethernet Management Adapter",
                (VR_BUG_NONE),
                (VR_FEATURE_RX_PAUSE_CAP | VR_FEATURE_TX_PAUSE_CAP |
                    VR_FEATURE_TXCHKSUM | VR_FEATURE_RXCHKSUM |
                    VR_FEATURE_CAMSUPPORT | VR_FEATURE_VLANTAGGING |
                    VR_FEATURE_MIBCOUNTER)
        }
};

/*
 * Function prototypes
 */
static  vr_result_t     vr_add_intr(vr_t *vrp);
static  void            vr_remove_intr(vr_t *vrp);
static  int32_t         vr_cam_index(vr_t *vrp, const uint8_t *maddr);
static  uint32_t        ether_crc_be(const uint8_t *address);
static  void            vr_tx_enqueue_msg(vr_t *vrp, mblk_t *mp);
static  void            vr_log(vr_t *vrp, int level, const char *fmt, ...);
static  int             vr_resume(dev_info_t *devinfo);
static  int             vr_suspend(dev_info_t *devinfo);
static  vr_result_t     vr_bus_config(vr_t *vrp);
static  void            vr_bus_unconfig(vr_t *vrp);
static  void            vr_reset(vr_t *vrp);
static  int             vr_start(vr_t *vrp);
static  int             vr_stop(vr_t *vrp);
static  vr_result_t     vr_rings_init(vr_t *vrp);
static  void            vr_rings_fini(vr_t *vrp);
static  vr_result_t     vr_alloc_ring(vr_t *vrp, vr_ring_t *r, size_t n);
static  void            vr_free_ring(vr_ring_t *r, size_t n);
static  vr_result_t     vr_rxring_init(vr_t *vrp);
static  void            vr_rxring_fini(vr_t *vrp);
static  vr_result_t     vr_txring_init(vr_t *vrp);
static  void            vr_txring_fini(vr_t *vrp);
static  vr_result_t     vr_alloc_dmabuf(vr_t *vrp, vr_data_dma_t *dmap,
                            uint_t flags);
static  void            vr_free_dmabuf(vr_data_dma_t *dmap);
static  void            vr_param_init(vr_t *vrp);
static  mblk_t          *vr_receive(vr_t *vrp);
static  void            vr_tx_reclaim(vr_t *vrp);
static  void            vr_periodic(void *p);
static  void            vr_error(vr_t *vrp);
static  void            vr_phy_read(vr_t *vrp, int offset, uint16_t *value);
static  void            vr_phy_write(vr_t *vrp, int offset, uint16_t value);
static  void            vr_phy_autopoll_disable(vr_t *vrp);
static  void            vr_phy_autopoll_enable(vr_t *vrp);
static  void            vr_link_init(vr_t *vrp);
static  void            vr_link_state(vr_t *vrp);
static  void            vr_kstats_init(vr_t *vrp);
static  int             vr_update_kstats(kstat_t *ksp, int access);
static  void            vr_remove_kstats(vr_t *vrp);

static int
vr_attach(dev_info_t *devinfo, ddi_attach_cmd_t cmd)
{
        vr_t            *vrp;
        mac_register_t  *macreg;

        if (cmd == DDI_RESUME)
                return (vr_resume(devinfo));
        else if (cmd != DDI_ATTACH)
                return (DDI_FAILURE);

        /*
         * Attach.
         */
        vrp = kmem_zalloc(sizeof (vr_t), KM_SLEEP);
        ddi_set_driver_private(devinfo, vrp);
        vrp->devinfo = devinfo;

        /*
         * Store the name+instance of the module.
         */
        (void) snprintf(vrp->ifname, sizeof (vrp->ifname), "%s%d",
            MODULENAME, ddi_get_instance(devinfo));

        /*
         * Bus initialization.
         */
        if (vr_bus_config(vrp) != VR_SUCCESS) {
                vr_log(vrp, CE_WARN, "vr_bus_config failed");
                goto fail0;
        }

        /*
         * Initialize default parameters.
         */
        vr_param_init(vrp);

        /*
         * Setup the descriptor rings.
         */
        if (vr_rings_init(vrp) != VR_SUCCESS) {
                vr_log(vrp, CE_WARN, "vr_rings_init failed");
                goto fail1;
        }

        /*
         * Initialize kstats.
         */
        vr_kstats_init(vrp);

        /*
         * Add interrupt to the OS.
         */
        if (vr_add_intr(vrp) != VR_SUCCESS) {
                vr_log(vrp, CE_WARN, "vr_add_intr failed in attach");
                goto fail3;
        }

        /*
         * Add mutexes.
         */
        mutex_init(&vrp->intrlock, NULL, MUTEX_DRIVER,
            DDI_INTR_PRI(vrp->intr_pri));
        mutex_init(&vrp->oplock, NULL, MUTEX_DRIVER, NULL);
        mutex_init(&vrp->tx.lock, NULL, MUTEX_DRIVER, NULL);

        /*
         * Enable interrupt.
         */
        if (ddi_intr_enable(vrp->intr_hdl) != DDI_SUCCESS) {
                vr_log(vrp, CE_NOTE, "ddi_intr_enable failed");
                goto fail5;
        }

        /*
         * Register with parent, mac.
         */
        if ((macreg = mac_alloc(MAC_VERSION)) == NULL) {
                vr_log(vrp, CE_WARN, "mac_alloc failed in attach");
                goto fail6;
        }

        macreg->m_type_ident = MAC_PLUGIN_IDENT_ETHER;
        macreg->m_driver = vrp;
        macreg->m_dip = devinfo;
        macreg->m_src_addr = vrp->vendor_ether_addr;
        macreg->m_callbacks = &vr_mac_callbacks;
        macreg->m_min_sdu = 0;
        macreg->m_max_sdu = ETHERMTU;
        macreg->m_margin = VLAN_TAGSZ;

        if (mac_register(macreg, &vrp->machdl) != 0) {
                vr_log(vrp, CE_WARN, "mac_register failed in attach");
                goto fail7;
        }
        mac_free(macreg);
        return (DDI_SUCCESS);

fail7:
        mac_free(macreg);
fail6:
        (void) ddi_intr_disable(vrp->intr_hdl);
fail5:
        mutex_destroy(&vrp->tx.lock);
        mutex_destroy(&vrp->oplock);
        mutex_destroy(&vrp->intrlock);
        vr_remove_intr(vrp);
fail3:
        vr_remove_kstats(vrp);
fail2:
        vr_rings_fini(vrp);
fail1:
        vr_bus_unconfig(vrp);
fail0:
        kmem_free(vrp, sizeof (vr_t));
        return (DDI_FAILURE);
}

static int
vr_detach(dev_info_t *devinfo, ddi_detach_cmd_t cmd)
{
        vr_t            *vrp;

        vrp = ddi_get_driver_private(devinfo);

        if (cmd == DDI_SUSPEND)
                return (vr_suspend(devinfo));
        else if (cmd != DDI_DETACH)
                return (DDI_FAILURE);

        if (vrp->chip.state == CHIPSTATE_RUNNING)
                return (DDI_FAILURE);

        /*
         * Try to un-register from the MAC layer.
         */
        if (mac_unregister(vrp->machdl) != 0)
                return (DDI_FAILURE);

        (void) ddi_intr_disable(vrp->intr_hdl);
        vr_remove_intr(vrp);
        mutex_destroy(&vrp->tx.lock);
        mutex_destroy(&vrp->oplock);
        mutex_destroy(&vrp->intrlock);
        vr_remove_kstats(vrp);
        vr_rings_fini(vrp);
        vr_bus_unconfig(vrp);
        kmem_free(vrp, sizeof (vr_t));
        return (DDI_SUCCESS);
}

/*
 * quiesce the card for fast reboot.
 */
int
vr_quiesce(dev_info_t *dev_info)
{
        vr_t    *vrp;

        vrp = (vr_t *)ddi_get_driver_private(dev_info);

        /*
         * Stop interrupts.
         */
        VR_PUT16(vrp->acc_reg, VR_ICR0, 0);
        VR_PUT8(vrp->acc_reg, VR_ICR1, 0);

        /*
         * Stop DMA.
         */
        VR_PUT8(vrp->acc_reg, VR_CTRL0, VR_CTRL0_DMA_STOP);
        return (DDI_SUCCESS);
}

/*
 * Add an interrupt for our device to the OS.
 */
static vr_result_t
vr_add_intr(vr_t *vrp)
{
        int     nintrs;
        int     rc;

        rc = ddi_intr_alloc(vrp->devinfo, &vrp->intr_hdl,
            DDI_INTR_TYPE_FIXED,        /* type */
            0,                  /* number */
            1,                  /* count */
            &nintrs,            /* actualp */
            DDI_INTR_ALLOC_STRICT);

        if (rc != DDI_SUCCESS) {
                vr_log(vrp, CE_NOTE, "ddi_intr_alloc failed: %d", rc);
                return (VR_FAILURE);
        }

        rc = ddi_intr_add_handler(vrp->intr_hdl, vr_intr, vrp, NULL);
        if (rc != DDI_SUCCESS) {
                vr_log(vrp, CE_NOTE, "ddi_intr_add_handler failed");
                if (ddi_intr_free(vrp->intr_hdl) != DDI_SUCCESS)
                        vr_log(vrp, CE_NOTE, "ddi_intr_free failed");
                return (VR_FAILURE);
        }

        rc = ddi_intr_get_pri(vrp->intr_hdl, &vrp->intr_pri);
        if (rc != DDI_SUCCESS) {
                vr_log(vrp, CE_NOTE, "ddi_intr_get_pri failed");
                if (ddi_intr_remove_handler(vrp->intr_hdl) != DDI_SUCCESS)
                        vr_log(vrp, CE_NOTE, "ddi_intr_remove_handler failed");

                if (ddi_intr_free(vrp->intr_hdl) != DDI_SUCCESS)
                        vr_log(vrp, CE_NOTE, "ddi_intr_free failed");

                return (VR_FAILURE);
        }
        return (VR_SUCCESS);
}

/*
 * Remove our interrupt from the OS.
 */
static void
vr_remove_intr(vr_t *vrp)
{
        if (ddi_intr_remove_handler(vrp->intr_hdl) != DDI_SUCCESS)
                vr_log(vrp, CE_NOTE, "ddi_intr_remove_handler failed");

        if (ddi_intr_free(vrp->intr_hdl) != DDI_SUCCESS)
                vr_log(vrp, CE_NOTE, "ddi_intr_free failed");
}

/*
 * Resume operation after suspend.
 */
static int
vr_resume(dev_info_t *devinfo)
{
        vr_t *vrp;

        vrp = (vr_t *)ddi_get_driver_private(devinfo);
        mutex_enter(&vrp->oplock);
        if (vrp->chip.state == CHIPSTATE_SUSPENDED_RUNNING)
                (void) vr_start(vrp);
        mutex_exit(&vrp->oplock);
        return (DDI_SUCCESS);
}

/*
 * Suspend operation.
 */
static int
vr_suspend(dev_info_t *devinfo)
{
        vr_t *vrp;

        vrp = (vr_t *)ddi_get_driver_private(devinfo);
        mutex_enter(&vrp->oplock);
        if (vrp->chip.state == CHIPSTATE_RUNNING) {
                (void) vr_stop(vrp);
                vrp->chip.state = CHIPSTATE_SUSPENDED_RUNNING;
        }
        mutex_exit(&vrp->oplock);
        return (DDI_SUCCESS);
}

/*
 * Initial bus- and device configuration during attach(9E).
 */
static vr_result_t
vr_bus_config(vr_t *vrp)
{
        uint32_t                addr;
        int                     n, nsets, rc;
        uint_t                  elem;
        pci_regspec_t           *regs;

        /*
         * Get the reg property which describes the various access methods.
         */
        if (ddi_prop_lookup_int_array(DDI_DEV_T_ANY, vrp->devinfo,
            0, "reg", (int **)&regs, &elem) != DDI_PROP_SUCCESS) {
                vr_log(vrp, CE_WARN, "Can't get reg property");
                return (VR_FAILURE);
        }
        nsets = (elem * sizeof (uint_t)) / sizeof (pci_regspec_t);

        /*
         * Setup access to all available sets.
         */
        vrp->nsets = nsets;
        vrp->regset = kmem_zalloc(nsets * sizeof (vr_acc_t), KM_SLEEP);
        for (n = 0; n < nsets; n++) {
                rc = ddi_regs_map_setup(vrp->devinfo, n,
                    &vrp->regset[n].addr, 0, 0,
                    &vr_dev_dma_accattr,
                    &vrp->regset[n].hdl);
                if (rc != DDI_SUCCESS) {
                        vr_log(vrp, CE_NOTE,
                            "Setup of register set %d failed", n);
                        while (--n >= 0)
                                ddi_regs_map_free(&vrp->regset[n].hdl);
                        kmem_free(vrp->regset, nsets * sizeof (vr_acc_t));
                        ddi_prop_free(regs);
                        return (VR_FAILURE);
                }
                bcopy(&regs[n], &vrp->regset[n].reg, sizeof (pci_regspec_t));
        }
        ddi_prop_free(regs);

        /*
         * Assign type-named pointers to the register sets.
         */
        for (n = 0; n < nsets; n++) {
                addr = vrp->regset[n].reg.pci_phys_hi & PCI_REG_ADDR_M;
                if (addr == PCI_ADDR_CONFIG && vrp->acc_cfg == NULL)
                        vrp->acc_cfg = &vrp->regset[n];
                else if (addr == PCI_ADDR_IO && vrp->acc_io == NULL)
                        vrp->acc_io = &vrp->regset[n];
                else if (addr == PCI_ADDR_MEM32 && vrp->acc_mem == NULL)
                        vrp->acc_mem = &vrp->regset[n];
        }

        /*
         * Assure there is one of each type.
         */
        if (vrp->acc_cfg == NULL ||
            vrp->acc_io == NULL ||
            vrp->acc_mem == NULL) {
                for (n = 0; n < nsets; n++)
                        ddi_regs_map_free(&vrp->regset[n].hdl);
                kmem_free(vrp->regset, nsets * sizeof (vr_acc_t));
                vr_log(vrp, CE_WARN,
                    "Config-, I/O- and memory sets not available");
                return (VR_FAILURE);
        }

        /*
         * Store vendor/device/revision.
         */
        vrp->chip.vendor = VR_GET16(vrp->acc_cfg, PCI_CONF_VENID);
        vrp->chip.device = VR_GET16(vrp->acc_cfg, PCI_CONF_DEVID);
        vrp->chip.revision = VR_GET16(vrp->acc_cfg, PCI_CONF_REVID);

        /*
         * Copy the matching chip_info_t structure.
         */
        elem = sizeof (vr_chip_info) / sizeof (chip_info_t);
        for (n = 0; n < elem; n++) {
                if (vrp->chip.revision >= vr_chip_info[n].revmin &&
                    vrp->chip.revision <= vr_chip_info[n].revmax) {
                        bcopy((void*)&vr_chip_info[n],
                            (void*)&vrp->chip.info,
                            sizeof (chip_info_t));
                        break;
                }
        }

        /*
         * If we didn't find a chip_info_t for this card, copy the first
         * entry of the info structures. This is a generic Rhine whith no
         * bugs and no features.
         */
        if (vrp->chip.info.name == NULL) {
                bcopy((void*)&vr_chip_info[0],
                    (void*) &vrp->chip.info,
                    sizeof (chip_info_t));
        }

        /*
         * Tell what is found.
         */
        vr_log(vrp, CE_NOTE, "pci%d,%d,%d: %s, revision 0x%0x",
            PCI_REG_BUS_G(vrp->acc_cfg->reg.pci_phys_hi),
            PCI_REG_DEV_G(vrp->acc_cfg->reg.pci_phys_hi),
            PCI_REG_FUNC_G(vrp->acc_cfg->reg.pci_phys_hi),
            vrp->chip.info.name,
            vrp->chip.revision);

        /*
         * Assure that the device is prepared for memory space accesses
         * This should be the default as the device advertises memory
         * access in it's BAR's. However, my VT6102 on a EPIA CL board doesn't
         * and thus we explicetely enable it.
         */
        VR_SETBIT8(vrp->acc_io, VR_CFGD, VR_CFGD_MMIOEN);

        /*
         * Setup a handle for regular usage, prefer memory space accesses.
         */
        if (vrp->acc_mem != NULL &&
            (vrp->chip.info.bugs & VR_BUG_NO_MEMIO) == 0)
                vrp->acc_reg = vrp->acc_mem;
        else
                vrp->acc_reg = vrp->acc_io;

        /*
         * Store the vendor's MAC address.
         */
        for (n = 0; n < ETHERADDRL; n++) {
                vrp->vendor_ether_addr[n] = VR_GET8(vrp->acc_reg,
                    VR_ETHERADDR + n);
        }
        return (VR_SUCCESS);
}

static void
vr_bus_unconfig(vr_t *vrp)
{
        uint_t  n;

        /*
         * Free the register access handles.
         */
        for (n = 0; n < vrp->nsets; n++)
                ddi_regs_map_free(&vrp->regset[n].hdl);
        kmem_free(vrp->regset, vrp->nsets * sizeof (vr_acc_t));
}

/*
 * Initialize parameter structures.
 */
static void
vr_param_init(vr_t *vrp)
{
        /*
         * Initialize default link configuration parameters.
         */
        vrp->param.an_en = VR_LINK_AUTONEG_ON;
        vrp->param.anadv_en = 1; /* Select 802.3 autonegotiation */
        vrp->param.anadv_en |= MII_ABILITY_100BASE_T4;
        vrp->param.anadv_en |= MII_ABILITY_100BASE_TX_FD;
        vrp->param.anadv_en |= MII_ABILITY_100BASE_TX;
        vrp->param.anadv_en |= MII_ABILITY_10BASE_T_FD;
        vrp->param.anadv_en |= MII_ABILITY_10BASE_T;
        /* Not a PHY ability, but advertised on behalf of MAC */
        vrp->param.anadv_en |= MII_ABILITY_PAUSE;
        vrp->param.mtu = ETHERMTU;

        /*
         * Store the PHY identity.
         */
        vr_phy_read(vrp, MII_PHYIDH, &vrp->chip.mii.identh);
        vr_phy_read(vrp, MII_PHYIDL, &vrp->chip.mii.identl);

        /*
         * Clear incapabilities imposed by PHY in phymask.
         */
        vrp->param.an_phymask = vrp->param.anadv_en;
        vr_phy_read(vrp, MII_STATUS, &vrp->chip.mii.status);
        if ((vrp->chip.mii.status & MII_STATUS_10) == 0)
                vrp->param.an_phymask &= ~MII_ABILITY_10BASE_T;

        if ((vrp->chip.mii.status & MII_STATUS_10_FD) == 0)
                vrp->param.an_phymask &= ~MII_ABILITY_10BASE_T_FD;

        if ((vrp->chip.mii.status & MII_STATUS_100_BASEX) == 0)
                vrp->param.an_phymask &= ~MII_ABILITY_100BASE_TX;

        if ((vrp->chip.mii.status & MII_STATUS_100_BASEX_FD) == 0)
                vrp->param.an_phymask &= ~MII_ABILITY_100BASE_TX_FD;

        if ((vrp->chip.mii.status & MII_STATUS_100_BASE_T4) == 0)
                vrp->param.an_phymask &= ~MII_ABILITY_100BASE_T4;

        /*
         * Clear incapabilities imposed by MAC in macmask
         * Note that flowcontrol (FCS?) is never masked. All of our adapters
         * have the ability to honor incoming pause frames. Only the newer can
         * transmit pause frames. Since there's no asym flowcontrol in 100Mbit
         * Ethernet, we always advertise (symmetric) pause.
         */
        vrp->param.an_macmask = vrp->param.anadv_en;

        /*
         * Advertised capabilities is enabled minus incapable.
         */
        vrp->chip.mii.anadv = vrp->param.anadv_en &
            (vrp->param.an_phymask & vrp->param.an_macmask);

        /*
         * Ensure that autoneg of the PHY matches our default.
         */
        if (vrp->param.an_en == VR_LINK_AUTONEG_ON)
                vrp->chip.mii.control = MII_CONTROL_ANE;
        else
                vrp->chip.mii.control =
                    (MII_CONTROL_100MB | MII_CONTROL_FDUPLEX);
}

/*
 * Setup the descriptor rings.
 */
static vr_result_t
vr_rings_init(vr_t *vrp)
{

        vrp->rx.ndesc = VR_RX_N_DESC;
        vrp->tx.ndesc = VR_TX_N_DESC;

        /*
         * Create a ring for receive.
         */
        if (vr_alloc_ring(vrp, &vrp->rxring, vrp->rx.ndesc) != VR_SUCCESS)
                return (VR_FAILURE);

        /*
         * Create a ring for transmit.
         */
        if (vr_alloc_ring(vrp, &vrp->txring, vrp->tx.ndesc) != VR_SUCCESS) {
                vr_free_ring(&vrp->rxring, vrp->rx.ndesc);
                return (VR_FAILURE);
        }

        vrp->rx.ring = vrp->rxring.desc;
        vrp->tx.ring = vrp->txring.desc;
        return (VR_SUCCESS);
}

static void
vr_rings_fini(vr_t *vrp)
{
        vr_free_ring(&vrp->rxring, vrp->rx.ndesc);
        vr_free_ring(&vrp->txring, vrp->tx.ndesc);
}

/*
 * Allocate a descriptor ring
 * The number of descriptor entries must fit in a single page so that the
 * whole ring fits in one consequtive space.
 *  i386:  4K page / 16 byte descriptor = 256 entries
 *  sparc: 8K page / 16 byte descriptor = 512 entries
 */
static vr_result_t
vr_alloc_ring(vr_t *vrp, vr_ring_t *ring, size_t n)
{
        ddi_dma_cookie_t        desc_dma_cookie;
        uint_t                  desc_cookiecnt;
        int                     i, rc;
        size_t                  rbytes;

        /*
         * Allocate a DMA handle for the chip descriptors.
         */
        rc = ddi_dma_alloc_handle(vrp->devinfo,
            &vr_dev_dma_attr,
            DDI_DMA_SLEEP,
            NULL,
            &ring->handle);

        if (rc != DDI_SUCCESS) {
                vr_log(vrp, CE_WARN,
                    "ddi_dma_alloc_handle in vr_alloc_ring failed.");
                return (VR_FAILURE);
        }

        /*
         * Allocate memory for the chip descriptors.
         */
        rc = ddi_dma_mem_alloc(ring->handle,
            n * sizeof (vr_chip_desc_t),
            &vr_dev_dma_accattr,
            DDI_DMA_CONSISTENT,
            DDI_DMA_SLEEP,
            NULL,
            (caddr_t *)&ring->cdesc,
            &rbytes,
            &ring->acchdl);

        if (rc != DDI_SUCCESS) {
                vr_log(vrp, CE_WARN,
                    "ddi_dma_mem_alloc in vr_alloc_ring failed.");
                ddi_dma_free_handle(&ring->handle);
                return (VR_FAILURE);
        }

        /*
         * Map the descriptor memory.
         */
        rc = ddi_dma_addr_bind_handle(ring->handle,
            NULL,
            (caddr_t)ring->cdesc,
            rbytes,
            DDI_DMA_RDWR | DDI_DMA_CONSISTENT,
            DDI_DMA_SLEEP,
            NULL,
            &desc_dma_cookie,
            &desc_cookiecnt);

        if (rc != DDI_DMA_MAPPED || desc_cookiecnt > 1) {
                vr_log(vrp, CE_WARN,
                    "ddi_dma_addr_bind_handle in vr_alloc_ring failed: "
                    "rc = %d, cookiecnt = %d", rc, desc_cookiecnt);
                ddi_dma_mem_free(&ring->acchdl);
                ddi_dma_free_handle(&ring->handle);
                return (VR_FAILURE);
        }
        ring->cdesc_paddr = desc_dma_cookie.dmac_address;

        /*
         * Allocate memory for the host descriptor ring.
         */
        ring->desc =
            (vr_desc_t *)kmem_zalloc(n * sizeof (vr_desc_t), KM_SLEEP);

        /*
         * Interlink the descriptors and connect host- to chip descriptors.
         */
        for (i = 0; i < n; i++) {
                /*
                 * Connect the host descriptor to a chip descriptor.
                 */
                ring->desc[i].cdesc = &ring->cdesc[i];

                /*
                 * Store the DMA address and offset in the descriptor
                 * Offset is for ddi_dma_sync() and paddr is for ddi_get/-put().
                 */
                ring->desc[i].offset = i * sizeof (vr_chip_desc_t);
                ring->desc[i].paddr = ring->cdesc_paddr + ring->desc[i].offset;

                /*
                 * Link the previous descriptor to this one.
                 */
                if (i > 0) {
                        /* Host */
                        ring->desc[i-1].next = &ring->desc[i];

                        /* Chip */
                        ddi_put32(ring->acchdl,
                            &ring->cdesc[i-1].next,
                            ring->desc[i].paddr);
                }
        }

        /*
         * Make rings out of this list by pointing last to first.
         */
        i = n - 1;
        ring->desc[i].next = &ring->desc[0];
        ddi_put32(ring->acchdl, &ring->cdesc[i].next, ring->desc[0].paddr);
        return (VR_SUCCESS);
}

/*
 * Free the memory allocated for a ring.
 */
static void
vr_free_ring(vr_ring_t *r, size_t n)
{
        /*
         * Unmap and free the chip descriptors.
         */
        (void) ddi_dma_unbind_handle(r->handle);
        ddi_dma_mem_free(&r->acchdl);
        ddi_dma_free_handle(&r->handle);

        /*
         * Free the memory for storing host descriptors
         */
        kmem_free(r->desc, n * sizeof (vr_desc_t));
}

/*
 * Initialize the receive ring.
 */
static vr_result_t
vr_rxring_init(vr_t *vrp)
{
        int             i, rc;
        vr_desc_t       *rp;

        /*
         * Set the read pointer at the start of the ring.
         */
        vrp->rx.rp = &vrp->rx.ring[0];

        /*
         * Assign a DMA buffer to each receive descriptor.
         */
        for (i = 0; i < vrp->rx.ndesc; i++) {
                rp = &vrp->rx.ring[i];
                rc = vr_alloc_dmabuf(vrp,
                    &vrp->rx.ring[i].dmabuf,
                    DDI_DMA_STREAMING | DDI_DMA_READ);

                if (rc != VR_SUCCESS) {
                        while (--i >= 0)
                                vr_free_dmabuf(&vrp->rx.ring[i].dmabuf);
                        return (VR_FAILURE);
                }

                /*
                 * Store the address of the dma buffer in the chip descriptor
                 */
                ddi_put32(vrp->rxring.acchdl,
                    &rp->cdesc->data,
                    rp->dmabuf.paddr);

                /*
                 * Put the buffer length in the chip descriptor. Ensure that
                 * length fits in the 11 bits of stat1 (2047/0x7FF)
                 */
                ddi_put32(vrp->rxring.acchdl, &rp->cdesc->stat1,
                    MIN(VR_MAX_PKTSZ, rp->dmabuf.bufsz));

                /*
                 * Set descriptor ownership to the card
                 */
                ddi_put32(vrp->rxring.acchdl, &rp->cdesc->stat0, VR_RDES0_OWN);

                /*
                 * Sync the descriptor with main memory
                 */
                (void) ddi_dma_sync(vrp->rxring.handle, rp->offset,
                    sizeof (vr_chip_desc_t), DDI_DMA_SYNC_FORDEV);
        }
        return (VR_SUCCESS);
}

/*
 * Free the DMA buffers assigned to the receive ring.
 */
static void
vr_rxring_fini(vr_t *vrp)
{
        int             i;

        for (i = 0; i < vrp->rx.ndesc; i++)
                vr_free_dmabuf(&vrp->rx.ring[i].dmabuf);
}

static vr_result_t
vr_txring_init(vr_t *vrp)
{
        vr_desc_t               *wp;
        int                     i, rc;

        /*
         * Set the write- and claim pointer.
         */
        vrp->tx.wp = &vrp->tx.ring[0];
        vrp->tx.cp = &vrp->tx.ring[0];

        /*
         * (Re)set the TX bookkeeping.
         */
        vrp->tx.stallticks = 0;
        vrp->tx.resched = 0;

        /*
         * Every transmit decreases nfree. Every reclaim increases nfree.
         */
        vrp->tx.nfree = vrp->tx.ndesc;

        /*
         * Attach a DMA buffer to each transmit descriptor.
         */
        for (i = 0; i < vrp->tx.ndesc; i++) {
                rc = vr_alloc_dmabuf(vrp,
                    &vrp->tx.ring[i].dmabuf,
                    DDI_DMA_STREAMING | DDI_DMA_WRITE);

                if (rc != VR_SUCCESS) {
                        while (--i >= 0)
                                vr_free_dmabuf(&vrp->tx.ring[i].dmabuf);
                        return (VR_FAILURE);
                }
        }

        /*
         * Init & sync the TX descriptors so the device sees a valid ring.
         */
        for (i = 0; i < vrp->tx.ndesc; i++) {
                wp = &vrp->tx.ring[i];
                ddi_put32(vrp->txring.acchdl, &wp->cdesc->stat0, 0);
                ddi_put32(vrp->txring.acchdl, &wp->cdesc->stat1, 0);
                ddi_put32(vrp->txring.acchdl, &wp->cdesc->data,
                    wp->dmabuf.paddr);
                (void) ddi_dma_sync(vrp->txring.handle, wp->offset,
                    sizeof (vr_chip_desc_t),
                    DDI_DMA_SYNC_FORDEV);
        }
        return (VR_SUCCESS);
}

/*
 * Free the DMA buffers attached to the TX ring.
 */
static void
vr_txring_fini(vr_t *vrp)
{
        int             i;

        /*
         * Free the DMA buffers attached to the TX ring
         */
        for (i = 0; i < vrp->tx.ndesc; i++)
                vr_free_dmabuf(&vrp->tx.ring[i].dmabuf);
}

/*
 * Allocate a DMA buffer.
 */
static vr_result_t
vr_alloc_dmabuf(vr_t *vrp, vr_data_dma_t *dmap, uint_t dmaflags)
{
        ddi_dma_cookie_t        dma_cookie;
        uint_t                  cookiecnt;
        int                     rc;

        /*
         * Allocate a DMA handle for the buffer
         */
        rc = ddi_dma_alloc_handle(vrp->devinfo,
            &vr_data_dma_attr,
            DDI_DMA_DONTWAIT, NULL,
            &dmap->handle);

        if (rc != DDI_SUCCESS) {
                vr_log(vrp, CE_WARN,
                    "ddi_dma_alloc_handle failed in vr_alloc_dmabuf");
                return (VR_FAILURE);
        }

        /*
         * Allocate the buffer
         * The allocated buffer is aligned on 2K boundary. This ensures that
         * a 1500 byte frame never cross a page boundary and thus that the DMA
         * mapping can be established in 1 fragment.
         */
        rc = ddi_dma_mem_alloc(dmap->handle,
            VR_DMABUFSZ,
            &vr_data_dma_accattr,
            DDI_DMA_RDWR | DDI_DMA_STREAMING,
            DDI_DMA_DONTWAIT, NULL,
            &dmap->buf,
            &dmap->bufsz,
            &dmap->acchdl);

        if (rc != DDI_SUCCESS) {
                vr_log(vrp, CE_WARN,
                    "ddi_dma_mem_alloc failed in vr_alloc_dmabuf");
                ddi_dma_free_handle(&dmap->handle);
                return (VR_FAILURE);
        }

        /*
         * Map the memory
         */
        rc = ddi_dma_addr_bind_handle(dmap->handle,
            NULL,
            (caddr_t)dmap->buf,
            dmap->bufsz,
            dmaflags,
            DDI_DMA_DONTWAIT,
            NULL,
            &dma_cookie,
            &cookiecnt);

        /*
         * The cookiecount should never > 1 because we requested 2K alignment
         */
        if (rc != DDI_DMA_MAPPED || cookiecnt > 1) {
                vr_log(vrp, CE_WARN,
                    "dma_addr_bind_handle failed in vr_alloc_dmabuf: "
                    "rc = %d, cookiecnt = %d", rc, cookiecnt);
                ddi_dma_mem_free(&dmap->acchdl);
                ddi_dma_free_handle(&dmap->handle);
                return (VR_FAILURE);
        }
        dmap->paddr = dma_cookie.dmac_address;
        return (VR_SUCCESS);
}

/*
 * Destroy a DMA buffer.
 */
static void
vr_free_dmabuf(vr_data_dma_t *dmap)
{
        (void) ddi_dma_unbind_handle(dmap->handle);
        ddi_dma_mem_free(&dmap->acchdl);
        ddi_dma_free_handle(&dmap->handle);
}

/*
 * Interrupt service routine
 * When our vector is shared with another device, av_dispatch_autovect calls
 * all service routines for the vector until *none* of them return claimed
 * That means that, when sharing vectors, this routine is called at least
 * twice for each interrupt.
 */
uint_t
vr_intr(caddr_t arg1, caddr_t arg2)
{
        vr_t            *vrp;
        uint16_t        status;
        mblk_t          *lp = NULL;
        uint32_t        tx_resched;
        uint32_t        link_change;

        tx_resched = 0;
        link_change = 0;
        vrp = (void *)arg1;
        _NOTE(ARGUNUSED(arg2))

        mutex_enter(&vrp->intrlock);
        /*
         * If the driver is not in running state it is not our interrupt.
         * Shared interrupts can end up here without us being started.
         */
        if (vrp->chip.state != CHIPSTATE_RUNNING) {
                mutex_exit(&vrp->intrlock);
                return (DDI_INTR_UNCLAIMED);
        }

        /*
         * Read the status register to see if the interrupt is from our device
         * This read also ensures that posted writes are brought to main memory.
         */
        status = VR_GET16(vrp->acc_reg, VR_ISR0) & VR_ICR0_CFG;
        if (status == 0) {
                /*
                 * Status contains no configured interrupts
                 * The interrupt was not generated by our device.
                 */
                vrp->stats.intr_unclaimed++;
                mutex_exit(&vrp->intrlock);
                return (DDI_INTR_UNCLAIMED);
        }
        vrp->stats.intr_claimed++;

        /*
         * Acknowledge the event(s) that caused interruption.
         */
        VR_PUT16(vrp->acc_reg, VR_ISR0, status);

        /*
         * Receive completion.
         */
        if ((status & (VR_ISR0_RX_DONE | VR_ISR_RX_ERR_BITS)) != 0) {
                /*
                 * Received some packets.
                 */
                lp = vr_receive(vrp);

                /*
                 * DMA stops after a conflict in the FIFO.
                 */
                if ((status & VR_ISR_RX_ERR_BITS) != 0)
                        VR_PUT8(vrp->acc_reg, VR_CTRL0, VR_CTRL0_DMA_GO);
                status &= ~(VR_ISR0_RX_DONE | VR_ISR_RX_ERR_BITS);
        }

        /*
         * Transmit completion.
         */
        if ((status & (VR_ISR0_TX_DONE | VR_ISR_TX_ERR_BITS)) != 0) {
                /*
                 * Card done with transmitting some packets
                 * TX_DONE is generated 3 times per ring but it appears
                 * more often because it is also set when an RX_DONE
                 * interrupt is generated.
                 */
                mutex_enter(&vrp->tx.lock);
                vr_tx_reclaim(vrp);
                tx_resched = vrp->tx.resched;
                vrp->tx.resched = 0;
                mutex_exit(&vrp->tx.lock);
                status &= ~(VR_ISR0_TX_DONE | VR_ISR_TX_ERR_BITS);
        }

        /*
         * Link status change.
         */
        if ((status & VR_ICR0_LINKSTATUS) != 0) {
                /*
                 * Get new link state and inform the mac layer.
                 */
                mutex_enter(&vrp->oplock);
                mutex_enter(&vrp->tx.lock);
                vr_link_state(vrp);
                mutex_exit(&vrp->tx.lock);
                mutex_exit(&vrp->oplock);
                status &= ~VR_ICR0_LINKSTATUS;
                vrp->stats.linkchanges++;
                link_change = 1;
        }

        /*
         * Bus error.
         */
        if ((status & VR_ISR0_BUSERR) != 0) {
                vr_log(vrp, CE_WARN, "bus error occured");
                vrp->reset = 1;
                status &= ~VR_ISR0_BUSERR;
        }

        /*
         * We must have handled all things here.
         */
        ASSERT(status == 0);
        mutex_exit(&vrp->intrlock);

        /*
         * Reset the device if requested
         * The request can come from the periodic tx check or from the interrupt
         * status.
         */
        if (vrp->reset != 0) {
                vr_error(vrp);
                vrp->reset = 0;
        }

        /*
         * Pass up the list with received packets.
         */
        if (lp != NULL)
                mac_rx(vrp->machdl, 0, lp);

        /*
         * Inform the upper layer on the linkstatus if there was a change.
         */
        if (link_change != 0)
                mac_link_update(vrp->machdl,
                    (link_state_t)vrp->chip.link.state);
        /*
         * Restart transmissions if we were waiting for tx descriptors.
         */
        if (tx_resched == 1)
                mac_tx_update(vrp->machdl);

        /*
         * Read something from the card to ensure that all of our configuration
         * writes are delivered to the device before the interrupt is ended.
         */
        (void) VR_GET8(vrp->acc_reg, VR_ETHERADDR);
        return (DDI_INTR_CLAIMED);
}

/*
 * Respond to an unforseen situation by resetting the card and our bookkeeping.
 */
static void
vr_error(vr_t *vrp)
{
        vr_log(vrp, CE_WARN, "resetting MAC.");
        mutex_enter(&vrp->intrlock);
        mutex_enter(&vrp->oplock);
        mutex_enter(&vrp->tx.lock);
        (void) vr_stop(vrp);
        vr_reset(vrp);
        (void) vr_start(vrp);
        mutex_exit(&vrp->tx.lock);
        mutex_exit(&vrp->oplock);
        mutex_exit(&vrp->intrlock);
        vrp->stats.resets++;
}

/*
 * Collect received packets in a list.
 */
static mblk_t *
vr_receive(vr_t *vrp)
{
        mblk_t                  *lp, *mp, *np;
        vr_desc_t               *rxp;
        vr_data_dma_t           *dmap;
        uint32_t                pklen;
        uint32_t                rxstat0;
        uint32_t                n;

        lp = NULL;
        n = 0;
        for (rxp = vrp->rx.rp; ; rxp = rxp->next, n++) {
                /*
                 * Sync the descriptor before looking at it.
                 */
                (void) ddi_dma_sync(vrp->rxring.handle, rxp->offset,
                    sizeof (vr_chip_desc_t), DDI_DMA_SYNC_FORKERNEL);

                /*
                 * Get the status from the descriptor.
                 */
                rxstat0 = ddi_get32(vrp->rxring.acchdl, &rxp->cdesc->stat0);

                /*
                 * We're done if the descriptor is owned by the card.
                 */
                if ((rxstat0 & VR_RDES0_OWN) != 0)
                        break;
                else if ((rxstat0 & VR_RDES0_RXOK) != 0) {
                        /*
                         * Received a good packet
                         */
                        dmap = &rxp->dmabuf;
                        pklen = (rxstat0 >> 16) - ETHERFCSL;

                        /*
                         * Sync the data.
                         */
                        (void) ddi_dma_sync(dmap->handle, 0,
                            pklen, DDI_DMA_SYNC_FORKERNEL);

                        /*
                         * Send a new copied message upstream.
                         */
                        np = allocb(pklen, 0);
                        if (np != NULL) {
                                bcopy(dmap->buf, np->b_rptr, pklen);
                                np->b_wptr = np->b_rptr + pklen;

                                vrp->stats.mac_stat_ipackets++;
                                vrp->stats.mac_stat_rbytes += pklen;

                                if ((rxstat0 & VR_RDES0_BAR) != 0)
                                        vrp->stats.mac_stat_brdcstrcv++;
                                else if ((rxstat0 & VR_RDES0_MAR) != 0)
                                        vrp->stats.mac_stat_multircv++;

                                /*
                                 * Link this packet in the list.
                                 */
                                np->b_next = NULL;
                                if (lp == NULL)
                                        lp = mp = np;
                                else {
                                        mp->b_next = np;
                                        mp = np;
                                }
                        } else {
                                vrp->stats.allocbfail++;
                                vrp->stats.mac_stat_norcvbuf++;
                        }

                } else {
                        /*
                         * Received with errors.
                         */
                        vrp->stats.mac_stat_ierrors++;
                        if ((rxstat0 & VR_RDES0_FAE) != 0)
                                vrp->stats.ether_stat_align_errors++;
                        if ((rxstat0 & VR_RDES0_CRCERR) != 0)
                                vrp->stats.ether_stat_fcs_errors++;
                        if ((rxstat0 & VR_RDES0_LONG) != 0)
                                vrp->stats.ether_stat_toolong_errors++;
                        if ((rxstat0 & VR_RDES0_RUNT) != 0)
                                vrp->stats.ether_stat_tooshort_errors++;
                        if ((rxstat0 & VR_RDES0_FOV) != 0)
                                vrp->stats.mac_stat_overflows++;
                }

                /*
                 * Reset descriptor ownership to the MAC.
                 */
                ddi_put32(vrp->rxring.acchdl,
                    &rxp->cdesc->stat0,
                    VR_RDES0_OWN);
                (void) ddi_dma_sync(vrp->rxring.handle,
                    rxp->offset,
                    sizeof (vr_chip_desc_t),
                    DDI_DMA_SYNC_FORDEV);
        }
        vrp->rx.rp = rxp;

        /*
         * If we do flowcontrol and if the card can transmit pause frames,
         * increment the "available receive descriptors" register.
         */
        if (n > 0 && vrp->chip.link.flowctrl == VR_PAUSE_BIDIRECTIONAL) {
                /*
                 * Whenever the card moves a fragment to host memory it
                 * decrements the RXBUFCOUNT register. If the value in the
                 * register reaches a low watermark, the card transmits a pause
                 * frame. If the value in this register reaches a high
                 * watermark, the card sends a "cancel pause" frame
                 *
                 * Non-zero values written to this byte register are added
                 * by the chip to the register's contents, so we must write
                 * the number of descriptors free'd.
                 */
                VR_PUT8(vrp->acc_reg, VR_FCR0_RXBUFCOUNT, MIN(n, 0xFF));
        }
        return (lp);
}

/*
 * Enqueue a list of packets for transmission
 * Return the packets not transmitted.
 */
mblk_t *
vr_mac_tx_enqueue_list(void *p, mblk_t *mp)
{
        vr_t            *vrp;
        mblk_t          *nextp;

        vrp = (vr_t *)p;
        mutex_enter(&vrp->tx.lock);
        do {
                if (vrp->tx.nfree == 0) {
                        vrp->stats.ether_stat_defer_xmts++;
                        vrp->tx.resched = 1;
                        break;
                }
                nextp = mp->b_next;
                mp->b_next = mp->b_prev = NULL;
                vr_tx_enqueue_msg(vrp, mp);
                mp = nextp;
                vrp->tx.nfree--;
        } while (mp != NULL);
        mutex_exit(&vrp->tx.lock);

        /*
         * Tell the chip to poll the TX ring.
         */
        VR_PUT8(vrp->acc_reg, VR_CTRL0, VR_CTRL0_DMA_GO);
        return (mp);
}

/*
 * Enqueue a message for transmission.
 */
static void
vr_tx_enqueue_msg(vr_t *vrp, mblk_t *mp)
{
        vr_desc_t               *wp;
        vr_data_dma_t           *dmap;
        uint32_t                pklen;
        uint32_t                nextp;
        int                     padlen;

        if ((uchar_t)mp->b_rptr[0] == 0xff &&
            (uchar_t)mp->b_rptr[1] == 0xff &&
            (uchar_t)mp->b_rptr[2] == 0xff &&
            (uchar_t)mp->b_rptr[3] == 0xff &&
            (uchar_t)mp->b_rptr[4] == 0xff &&
            (uchar_t)mp->b_rptr[5] == 0xff)
                vrp->stats.mac_stat_brdcstxmt++;
        else if ((uchar_t)mp->b_rptr[0] == 1)
                vrp->stats.mac_stat_multixmt++;

        pklen = msgsize(mp);
        wp = vrp->tx.wp;
        dmap = &wp->dmabuf;

        /*
         * Copy the message into the pre-mapped buffer and free mp
         */
        mcopymsg(mp, dmap->buf);

        /*
         * Clean padlen bytes of short packet.
         */
        padlen = ETHERMIN - pklen;
        if (padlen > 0) {
                bzero(dmap->buf + pklen, padlen);
                pklen += padlen;
        }

        /*
         * Most of the statistics are updated on reclaim, after the actual
         * transmit. obytes is maintained here because the length is cleared
         * after transmission
         */
        vrp->stats.mac_stat_obytes += pklen;

        /*
         * Sync the data so the device sees the new content too.
         */
        (void) ddi_dma_sync(dmap->handle, 0, pklen, DDI_DMA_SYNC_FORDEV);

        /*
         * If we have reached the TX interrupt distance, enable a TX interrupt
         * for this packet. The Interrupt Control (IC) bit in the transmit
         * descriptor doesn't have any effect on the interrupt generation
         * despite the vague statements in the datasheet. Thus, we use the
         * more obscure interrupt suppress bit which is probably part of the
         * MAC's bookkeeping for TX interrupts and fragmented packets.
         */
        vrp->tx.intr_distance++;
        nextp = ddi_get32(vrp->txring.acchdl, &wp->cdesc->next);
        if (vrp->tx.intr_distance >= VR_TX_MAX_INTR_DISTANCE) {
                /*
                 * Don't suppress the interrupt for this packet.
                 */
                vrp->tx.intr_distance = 0;
                nextp &= (~VR_TDES3_SUPPRESS_INTR);
        } else {
                /*
                 * Suppress the interrupt for this packet.
                 */
                nextp |= VR_TDES3_SUPPRESS_INTR;
        }

        /*
         * Write and sync the chip's descriptor
         */
        ddi_put32(vrp->txring.acchdl, &wp->cdesc->stat1,
            pklen | (VR_TDES1_STP | VR_TDES1_EDP | VR_TDES1_CHN));
        ddi_put32(vrp->txring.acchdl, &wp->cdesc->next, nextp);
        ddi_put32(vrp->txring.acchdl, &wp->cdesc->stat0, VR_TDES0_OWN);
        (void) ddi_dma_sync(vrp->txring.handle, wp->offset,
            sizeof (vr_chip_desc_t), DDI_DMA_SYNC_FORDEV);

        /*
         * The ticks counter is cleared by reclaim when it reclaimed some
         * descriptors and incremented by the periodic TX stall check.
         */
        vrp->tx.stallticks = 1;
        vrp->tx.wp = wp->next;
}

/*
 * Free transmitted descriptors.
 */
static void
vr_tx_reclaim(vr_t *vrp)
{
        vr_desc_t               *cp;
        uint32_t                stat0, stat1, freed, dirty;

        ASSERT(mutex_owned(&vrp->tx.lock));

        freed = 0;
        dirty = vrp->tx.ndesc - vrp->tx.nfree;
        for (cp = vrp->tx.cp; dirty > 0; cp = cp->next) {
                /*
                 * Sync & get descriptor status.
                 */
                (void) ddi_dma_sync(vrp->txring.handle, cp->offset,
                    sizeof (vr_chip_desc_t),
                    DDI_DMA_SYNC_FORKERNEL);
                stat0 = ddi_get32(vrp->txring.acchdl, &cp->cdesc->stat0);

                if ((stat0 & VR_TDES0_OWN) != 0)
                        break;

                /*
                 * Do stats for the first descriptor in a chain.
                 */
                stat1 = ddi_get32(vrp->txring.acchdl, &cp->cdesc->stat1);
                if ((stat1 & VR_TDES1_STP) != 0) {
                        if ((stat0 & VR_TDES0_TERR) != 0) {
                                vrp->stats.ether_stat_macxmt_errors++;
                                if ((stat0 & VR_TDES0_UDF) != 0)
                                        vrp->stats.mac_stat_underflows++;
                                if ((stat0 & VR_TDES0_ABT) != 0)
                                        vrp-> stats.ether_stat_ex_collisions++;
                                /*
                                 * Abort and FIFO underflow stop the MAC.
                                 * Packet queueing must be disabled with HD
                                 * links because otherwise the MAC is also lost
                                 * after a few of these events.
                                 */
                                VR_PUT8(vrp->acc_reg, VR_CTRL0,
                                    VR_CTRL0_DMA_GO);
                        } else
                                vrp->stats.mac_stat_opackets++;

                        if ((stat0 & VR_TDES0_COL) != 0) {
                                if ((stat0 & VR_TDES0_NCR) == 1) {
                                        vrp->stats.
                                            ether_stat_first_collisions++;
                                } else {
                                        vrp->stats.
                                            ether_stat_multi_collisions++;
                                }
                                vrp->stats.mac_stat_collisions +=
                                    (stat0 & VR_TDES0_NCR);
                        }

                        if ((stat0 & VR_TDES0_CRS) != 0)
                                vrp->stats.ether_stat_carrier_errors++;

                        if ((stat0 & VR_TDES0_OWC) != 0)
                                vrp->stats.ether_stat_tx_late_collisions++;
                }
                freed += 1;
                dirty -= 1;
        }
        vrp->tx.cp = cp;

        if (freed > 0) {
                vrp->tx.nfree += freed;
                vrp->tx.stallticks = 0;
                vrp->stats.txreclaims += 1;
        } else
                vrp->stats.txreclaim0 += 1;
}

/*
 * Check TX health every 2 seconds.
 */
static void
vr_periodic(void *p)
{
        vr_t            *vrp;

        vrp = (vr_t *)p;
        if (vrp->chip.state == CHIPSTATE_RUNNING &&
            vrp->chip.link.state == VR_LINK_STATE_UP && vrp->reset == 0) {
                if (mutex_tryenter(&vrp->intrlock) != 0) {
                        mutex_enter(&vrp->tx.lock);
                        if (vrp->tx.resched == 1) {
                                if (vrp->tx.stallticks >= VR_MAXTXCHECKS) {
                                        /*
                                         * No succesful reclaim in the last n
                                         * intervals. Reset the MAC.
                                         */
                                        vrp->reset = 1;
                                        vr_log(vrp, CE_WARN,
                                            "TX stalled, resetting MAC");
                                vrp->stats.txstalls++;
                                } else {
                                        /*
                                         * Increase until we find that we've
                                         * waited long enough.
                                         */
                                        vrp->tx.stallticks += 1;
                                }
                        }
                        mutex_exit(&vrp->tx.lock);
                        mutex_exit(&vrp->intrlock);
                        vrp->stats.txchecks++;
                }
        }
        vrp->stats.cyclics++;
}

/*
 * Bring the device to our desired initial state.
 */
static void
vr_reset(vr_t *vrp)
{
        uint32_t        time;

        /*
         * Reset the MAC
         * If we don't wait long enough for the forced reset to complete,
         * MAC looses sync with PHY. Result link up, no link change interrupt
         * and no data transfer.
         */
        time = 0;
        VR_PUT8(vrp->acc_io, VR_CTRL1, VR_CTRL1_RESET);
        do {
                drv_usecwait(100);
                time += 100;
                if (time >= 100000) {
                        VR_PUT8(vrp->acc_io, VR_MISC1, VR_MISC1_RESET);
                        delay(drv_usectohz(200000));
                }
        } while ((VR_GET8(vrp->acc_io, VR_CTRL1) & VR_CTRL1_RESET) != 0);
        delay(drv_usectohz(10000));

        /*
         * Load the PROM contents into the MAC again.
         */
        VR_SETBIT8(vrp->acc_io, VR_PROMCTL, VR_PROMCTL_RELOAD);
        delay(drv_usectohz(100000));

        /*
         * Tell the MAC via IO space that we like to use memory space for
         * accessing registers.
         */
        VR_SETBIT8(vrp->acc_io, VR_CFGD, VR_CFGD_MMIOEN);
}

/*
 * Prepare and enable the card (MAC + PHY + PCI).
 */
static int
vr_start(vr_t *vrp)
{
        uint8_t         pci_latency, pci_mode;

        ASSERT(mutex_owned(&vrp->oplock));

        /*
         * Allocate DMA buffers for RX.
         */
        if (vr_rxring_init(vrp) != VR_SUCCESS) {
                vr_log(vrp, CE_NOTE, "vr_rxring_init() failed");
                return (ENOMEM);
        }

        /*
         * Allocate DMA buffers for TX.
         */
        if (vr_txring_init(vrp) != VR_SUCCESS) {
                vr_log(vrp, CE_NOTE, "vr_txring_init() failed");
                vr_rxring_fini(vrp);
                return (ENOMEM);
        }

        /*
         * Changes of the chip specific registers as done in VIA's fet driver
         * These bits are not in the datasheet and controlled by vr_chip_info.
         */
        pci_mode = VR_GET8(vrp->acc_reg, VR_MODE2);
        if ((vrp->chip.info.bugs & VR_BUG_NEEDMODE10T) != 0)
                pci_mode |= VR_MODE2_MODE10T;

        if ((vrp->chip.info.bugs & VR_BUG_NEEDMODE2PCEROPT) != 0)
                pci_mode |= VR_MODE2_PCEROPT;

        if ((vrp->chip.info.features & VR_FEATURE_MRDLNMULTIPLE) != 0)
                pci_mode |= VR_MODE2_MRDPL;
        VR_PUT8(vrp->acc_reg, VR_MODE2, pci_mode);

        pci_mode = VR_GET8(vrp->acc_reg, VR_MODE3);
        if ((vrp->chip.info.bugs & VR_BUG_NEEDMIION) != 0)
                pci_mode |= VR_MODE3_MIION;
        VR_PUT8(vrp->acc_reg, VR_MODE3, pci_mode);

        /*
         * RX: Accept broadcast packets.
         */
        VR_SETBIT8(vrp->acc_reg, VR_RXCFG, VR_RXCFG_ACCEPTBROAD);

        /*
         * RX: Start DMA when there are 256 bytes in the FIFO.
         */
        VR_SETBITS8(vrp->acc_reg, VR_RXCFG, VR_RXCFG_FIFO_THRESHOLD_BITS,
            VR_RXCFG_FIFO_THRESHOLD_256);
        VR_SETBITS8(vrp->acc_reg, VR_BCR0, VR_BCR0_RX_FIFO_THRESHOLD_BITS,
            VR_BCR0_RX_FIFO_THRESHOLD_256);

        /*
         * TX: Start transmit when there are 256 bytes in the FIFO.
         */
        VR_SETBITS8(vrp->acc_reg, VR_TXCFG, VR_TXCFG_FIFO_THRESHOLD_BITS,
            VR_TXCFG_FIFO_THRESHOLD_256);
        VR_SETBITS8(vrp->acc_reg, VR_BCR1, VR_BCR1_TX_FIFO_THRESHOLD_BITS,
            VR_BCR1_TX_FIFO_THRESHOLD_256);

        /*
         * Burst transfers up to 256 bytes.
         */
        VR_SETBITS8(vrp->acc_reg, VR_BCR0, VR_BCR0_DMABITS, VR_BCR0_DMA256);

        /*
         * Disable TX autopolling as it is bad for RX performance
         * I assume this is because the RX process finds the bus often occupied
         * by the polling process.
         */
        VR_SETBIT8(vrp->acc_reg, VR_CTRL1, VR_CTRL1_NOAUTOPOLL);

        /*
         * Honor the PCI latency timer if it is reasonable.
         */
        pci_latency = VR_GET8(vrp->acc_cfg, PCI_CONF_LATENCY_TIMER);
        if (pci_latency != 0 && pci_latency != 0xFF)
                VR_SETBIT8(vrp->acc_reg, VR_CFGB, VR_CFGB_LATENCYTIMER);
        else
                VR_CLRBIT8(vrp->acc_reg, VR_CFGB, VR_CFGB_LATENCYTIMER);

        /*
         * Ensure that VLAN filtering is off, because this strips the tag.
         */
        if ((vrp->chip.info.features & VR_FEATURE_VLANTAGGING) != 0) {
                VR_CLRBIT8(vrp->acc_reg, VR_BCR1, VR_BCR1_VLANFILTER);
                VR_CLRBIT8(vrp->acc_reg, VR_TXCFG, VR_TXCFG_8021PQ_EN);
        }

        /*
         * Clear the CAM filter.
         */
        if ((vrp->chip.info.features & VR_FEATURE_CAMSUPPORT) != 0) {
                VR_PUT8(vrp->acc_reg, VR_CAM_CTRL, VR_CAM_CTRL_ENABLE);
                VR_PUT32(vrp->acc_reg, VR_CAM_MASK, 0);
                VR_PUT8(vrp->acc_reg, VR_CAM_CTRL, VR_CAM_CTRL_DONE);

                VR_PUT8(vrp->acc_reg, VR_CAM_CTRL,
                    VR_CAM_CTRL_ENABLE|VR_CAM_CTRL_SELECT_VLAN);
                VR_PUT8(vrp->acc_reg, VR_VCAM0, 0);
                VR_PUT8(vrp->acc_reg, VR_VCAM1, 0);
                VR_PUT8(vrp->acc_reg, VR_CAM_CTRL, VR_CAM_CTRL_WRITE);
                VR_PUT32(vrp->acc_reg, VR_CAM_MASK, 1);
                drv_usecwait(2);
                VR_PUT8(vrp->acc_reg, VR_CAM_CTRL, VR_CAM_CTRL_DONE);
        }

        /*
         * Give the start addresses of the descriptor rings to the DMA
         * controller on the MAC.
         */
        VR_PUT32(vrp->acc_reg, VR_RXADDR, vrp->rx.rp->paddr);
        VR_PUT32(vrp->acc_reg, VR_TXADDR, vrp->tx.wp->paddr);

        /*
         * We don't use the additionally invented interrupt ICR1 register,
         * so make sure these are disabled.
         */
        VR_PUT8(vrp->acc_reg, VR_ISR1, 0xFF);
        VR_PUT8(vrp->acc_reg, VR_ICR1, 0);

        /*
         * Enable interrupts.
         */
        VR_PUT16(vrp->acc_reg, VR_ISR0, 0xFFFF);
        VR_PUT16(vrp->acc_reg, VR_ICR0, VR_ICR0_CFG);

        /*
         * Enable the DMA controller.
         */
        VR_PUT8(vrp->acc_reg, VR_CTRL0, VR_CTRL0_DMA_GO);

        /*
         * Configure the link. Rely on the link change interrupt for getting
         * the link state into the driver.
         */
        vr_link_init(vrp);

        /*
         * Set the software view on the state to 'running'.
         */
        vrp->chip.state = CHIPSTATE_RUNNING;
        return (0);
}

/*
 * Stop DMA and interrupts.
 */
static int
vr_stop(vr_t *vrp)
{
        ASSERT(mutex_owned(&vrp->oplock));

        /*
         * Stop interrupts.
         */
        VR_PUT16(vrp->acc_reg, VR_ICR0, 0);
        VR_PUT8(vrp->acc_reg, VR_ICR1, 0);

        /*
         * Stop DMA.
         */
        VR_PUT8(vrp->acc_reg, VR_CTRL0, VR_CTRL0_DMA_STOP);

        /*
         * Set the software view on the state to stopped.
         */
        vrp->chip.state = CHIPSTATE_STOPPED;

        /*
         * Remove DMA buffers from the rings.
         */
        vr_rxring_fini(vrp);
        vr_txring_fini(vrp);
        return (0);
}

int
vr_mac_start(void *p)
{
        vr_t    *vrp;
        int     rc;

        vrp = (vr_t *)p;
        mutex_enter(&vrp->oplock);

        /*
         * Reset the card.
         */
        vr_reset(vrp);

        /*
         * Prepare and enable the card.
         */
        rc = vr_start(vrp);

        /*
         * Configure a cyclic function to keep the card & driver from diverting.
         */
        vrp->periodic_id =
            ddi_periodic_add(vr_periodic, vrp, VR_CHECK_INTERVAL, DDI_IPL_0);

        mutex_exit(&vrp->oplock);
        return (rc);
}

void
vr_mac_stop(void *p)
{
        vr_t    *vrp = p;

        mutex_enter(&vrp->oplock);
        mutex_enter(&vrp->tx.lock);

        /*
         * Stop the device.
         */
        (void) vr_stop(vrp);
        mutex_exit(&vrp->tx.lock);

        /*
         * Remove the cyclic from the system.
         */
        ddi_periodic_delete(vrp->periodic_id);
        mutex_exit(&vrp->oplock);
}

/*
 * Add or remove a multicast address to/from the filter
 *
 * From the 21143 manual:
 *  The 21143 can store 512 bits serving as hash bucket heads, and one physical
 *  48-bit Ethernet address. Incoming frames with multicast destination
 *  addresses are subjected to imperfect filtering. Frames with physical
 *  destination  addresses are checked against the single physical address.
 *  For any incoming frame with a multicast destination address, the 21143
 *  applies the standard Ethernet cyclic redundancy check (CRC) function to the
 *  first 6 bytes containing the destination address, then it uses the most
 *  significant 9 bits of the result as a bit index into the table. If the
 *  indexed bit is set, the frame is accepted. If the bit is cleared, the frame
 *  is rejected. This filtering mode is called imperfect because multicast
 *  frames not addressed to this station may slip through, but it still
 *  decreases the number of frames that the host can receive.
 * I assume the above is also the way the VIA chips work. There's not a single
 * word about the multicast filter in the datasheet.
 *
 * Another word on the CAM filter on VT6105M controllers:
 *  The VT6105M has content addressable memory which can be used for perfect
 *  filtering of 32 multicast addresses and a few VLAN id's
 *
 *  I think it works like this: When the controller receives a multicast
 *  address, it looks up the address using CAM. When it is found, it takes the
 *  matching cell address (index) and compares this to the bit position in the
 *  cam mask. If the bit is set, the packet is passed up. If CAM lookup does not
 *  result in a match, the packet is filtered using the hash based filter,
 *  if that matches, the packet is passed up and dropped otherwise
 * Also, there's not a single word in the datasheet on how this cam is supposed
 * to work ...
 */
int
vr_mac_set_multicast(void *p, boolean_t add, const uint8_t *mca)
{
        vr_t            *vrp;
        uint32_t        crc_index;
        int32_t         cam_index;
        uint32_t        cam_mask;
        boolean_t       use_hash_filter;
        ether_addr_t    taddr;
        uint32_t        a;

        vrp = (vr_t *)p;
        mutex_enter(&vrp->oplock);
        mutex_enter(&vrp->intrlock);
        use_hash_filter = B_FALSE;

        if ((vrp->chip.info.features & VR_FEATURE_CAMSUPPORT) != 0) {
                /*
                 * Program the perfect filter.
                 */
                cam_mask = VR_GET32(vrp->acc_reg, VR_CAM_MASK);
                if (add == B_TRUE) {
                        /*
                         * Get index of first empty slot.
                         */
                        bzero(&taddr, sizeof (taddr));
                        cam_index = vr_cam_index(vrp, taddr);
                        if (cam_index != -1) {
                                /*
                                 * Add address at cam_index.
                                 */
                                cam_mask |= (1 << cam_index);
                                VR_PUT8(vrp->acc_reg, VR_CAM_CTRL,
                                    VR_CAM_CTRL_ENABLE);
                                VR_PUT8(vrp->acc_reg, VR_CAM_ADDR, cam_index);
                                VR_PUT32(vrp->acc_reg, VR_CAM_MASK, cam_mask);
                                for (a = 0; a < ETHERADDRL; a++) {
                                        VR_PUT8(vrp->acc_reg,
                                            VR_MCAM0 + a, mca[a]);
                                }
                                VR_PUT8(vrp->acc_reg, VR_CAM_CTRL,
                                    VR_CAM_CTRL_WRITE);
                                drv_usecwait(2);
                                VR_PUT8(vrp->acc_reg, VR_CAM_CTRL,
                                    VR_CAM_CTRL_DONE);
                        } else {
                                /*
                                 * No free CAM slots available
                                 * Add mca to the imperfect filter.
                                 */
                                use_hash_filter = B_TRUE;
                        }
                } else {
                        /*
                         * Find the index of the entry to remove
                         * If the entry was not found (-1), the addition was
                         * probably done when the table was full.
                         */
                        cam_index = vr_cam_index(vrp, mca);
                        if (cam_index != -1) {
                                /*
                                 * Disable the corresponding mask bit.
                                 */
                                cam_mask &= ~(1 << cam_index);
                                VR_PUT8(vrp->acc_reg, VR_CAM_CTRL,
                                    VR_CAM_CTRL_ENABLE);
                                VR_PUT32(vrp->acc_reg, VR_CAM_MASK, cam_mask);
                                VR_PUT8(vrp->acc_reg, VR_CAM_CTRL,
                                    VR_CAM_CTRL_DONE);
                        } else {
                                /*
                                 * The entry to be removed was not found
                                 * The likely cause is that the CAM was full
                                 * during addition. The entry is added to the
                                 * hash filter in that case and needs to be
                                 * removed there too.
                                 */
                                use_hash_filter = B_TRUE;
                        }
                }
        } else {
                /*
                 * No CAM in the MAC, thus we need the hash filter.
                 */
                use_hash_filter = B_TRUE;
        }

        if (use_hash_filter == B_TRUE) {
                /*
                 * Get the CRC-32 of the multicast address
                 * The card uses the "MSB first" direction when calculating the
                 * the CRC. This is odd because ethernet is "LSB first"
                 * We have to use that "big endian" approach as well.
                 */
                crc_index = ether_crc_be(mca) >> (32 - 6);
                if (add == B_TRUE) {
                        /*
                         * Turn bit[crc_index] on.
                         */
                        if (crc_index < 32)
                                vrp->mhash0 |= (1 << crc_index);
                        else
                                vrp->mhash1 |= (1 << (crc_index - 32));
                } else {
                        /*
                         * Turn bit[crc_index] off.
                         */
                        if (crc_index < 32)
                                vrp->mhash0 &= ~(0 << crc_index);
                        else
                                vrp->mhash1 &= ~(0 << (crc_index - 32));
                }

                /*
                 * When not promiscuous write the filter now. When promiscuous,
                 * the filter is open and will be written when promiscuous ends.
                 */
                if (vrp->promisc == B_FALSE) {
                        VR_PUT32(vrp->acc_reg, VR_MAR0, vrp->mhash0);
                        VR_PUT32(vrp->acc_reg, VR_MAR1, vrp->mhash1);
                }
        }

        /*
         * Enable/disable multicast receivements based on mcount.
         */
        if (add == B_TRUE)
                vrp->mcount++;
        else if (vrp->mcount != 0)
                vrp->mcount --;
        if (vrp->mcount != 0)
                VR_SETBIT8(vrp->acc_reg, VR_RXCFG, VR_RXCFG_ACCEPTMULTI);
        else
                VR_CLRBIT8(vrp->acc_reg, VR_RXCFG, VR_RXCFG_ACCEPTMULTI);

        mutex_exit(&vrp->intrlock);
        mutex_exit(&vrp->oplock);
        return (0);
}

/*
 * Calculate the CRC32 for 6 bytes of multicast address in MSB(it) first order.
 * The MSB first order is a bit odd because Ethernet standard is LSB first
 */
static uint32_t
ether_crc_be(const uint8_t *data)
{
        uint32_t        crc = (uint32_t)0xFFFFFFFFU;
        uint32_t        carry;
        uint32_t        bit;
        uint32_t        length;
        uint8_t         c;

        for (length = 0; length < ETHERADDRL; length++) {
                c = data[length];
                for (bit = 0; bit < 8; bit++) {
                        carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01);
                        crc <<= 1;
                        c >>= 1;
                        if (carry)
                                crc = (crc ^ 0x04C11DB6) | carry;
                }
        }
        return (crc);
}


/*
 * Return the CAM index (base 0) of maddr or -1 if maddr is not found
 * If maddr is 0, return the index of an empty slot in CAM or -1 when no free
 * slots available.
 */
static int32_t
vr_cam_index(vr_t *vrp, const uint8_t *maddr)
{
        ether_addr_t    taddr;
        int32_t         index;
        uint32_t        mask;
        uint32_t        a;

        bzero(&taddr, sizeof (taddr));

        /*
         * Read the CAM mask from the controller.
         */
        mask = VR_GET32(vrp->acc_reg, VR_CAM_MASK);

        /*
         * If maddr is 0, return the first unused slot or -1 for no unused.
         */
        if (bcmp(maddr, taddr, ETHERADDRL) == 0) {
                /*
                 * Look for the first unused position in mask.
                 */
                for (index = 0; index < VR_CAM_SZ; index++) {
                        if (((mask >> index) & 1) == 0)
                                return (index);
                }
                return (-1);
        } else {
                /*
                 * Look for maddr in CAM.
                 */
                for (index = 0; index < VR_CAM_SZ; index++) {
                        /* Look at enabled entries only */
                        if (((mask >> index) & 1) == 0)
                                continue;

                        VR_PUT8(vrp->acc_reg, VR_CAM_CTRL, VR_CAM_CTRL_ENABLE);
                        VR_PUT8(vrp->acc_reg, VR_CAM_ADDR, index);
                        VR_PUT8(vrp->acc_reg, VR_CAM_CTRL, VR_CAM_CTRL_READ);
                        drv_usecwait(2);
                        for (a = 0; a < ETHERADDRL; a++)
                                taddr[a] = VR_GET8(vrp->acc_reg, VR_MCAM0 + a);
                        VR_PUT8(vrp->acc_reg, VR_CAM_CTRL, VR_CAM_CTRL_DONE);
                        if (bcmp(maddr, taddr, ETHERADDRL) == 0)
                                return (index);
                }
        }
        return (-1);
}

/*
 * Set promiscuous mode on or off.
 */
int
vr_mac_set_promisc(void *p, boolean_t promiscflag)
{
        vr_t            *vrp;
        uint8_t         rxcfg;

        vrp = (vr_t *)p;

        mutex_enter(&vrp->intrlock);
        mutex_enter(&vrp->oplock);
        mutex_enter(&vrp->tx.lock);

        /*
         * Get current receive configuration.
         */
        rxcfg = VR_GET8(vrp->acc_reg, VR_RXCFG);
        vrp->promisc = promiscflag;

        if (promiscflag == B_TRUE) {
                /*
                 * Enable promiscuous mode and open the multicast filter.
                 */
                rxcfg |= (VR_RXCFG_PROMISC | VR_RXCFG_ACCEPTMULTI);
                VR_PUT32(vrp->acc_reg, VR_MAR0, 0xffffffff);
                VR_PUT32(vrp->acc_reg, VR_MAR1, 0xffffffff);
        } else {
                /*
                 * Restore the multicast filter and disable promiscuous mode.
                 */
                VR_PUT32(vrp->acc_reg, VR_MAR0, vrp->mhash0);
                VR_PUT32(vrp->acc_reg, VR_MAR1, vrp->mhash1);
                rxcfg &= ~VR_RXCFG_PROMISC;
                if (vrp->mcount != 0)
                        rxcfg |= VR_RXCFG_ACCEPTMULTI;
        }
        VR_PUT8(vrp->acc_reg, VR_RXCFG, rxcfg);
        mutex_exit(&vrp->tx.lock);
        mutex_exit(&vrp->oplock);
        mutex_exit(&vrp->intrlock);
        return (0);
}

int
vr_mac_getstat(void *arg, uint_t stat, uint64_t *val)
{
        vr_t            *vrp;
        uint64_t        v;

        vrp = (void *) arg;

        switch (stat) {
        default:
                return (ENOTSUP);

        case ETHER_STAT_ADV_CAP_100T4:
                v = (vrp->chip.mii.anadv & MII_ABILITY_100BASE_T4) != 0;
                break;

        case ETHER_STAT_ADV_CAP_100FDX:
                v = (vrp->chip.mii.anadv & MII_ABILITY_100BASE_TX_FD) != 0;
                break;

        case ETHER_STAT_ADV_CAP_100HDX:
                v = (vrp->chip.mii.anadv & MII_ABILITY_100BASE_TX) != 0;
                break;

        case ETHER_STAT_ADV_CAP_10FDX:
                v = (vrp->chip.mii.anadv & MII_ABILITY_10BASE_T_FD) != 0;
                break;

        case ETHER_STAT_ADV_CAP_10HDX:
                v = (vrp->chip.mii.anadv & MII_ABILITY_10BASE_T) != 0;
                break;

        case ETHER_STAT_ADV_CAP_ASMPAUSE:
                v = 0;
                break;

        case ETHER_STAT_ADV_CAP_AUTONEG:
                v = (vrp->chip.mii.control & MII_CONTROL_ANE) != 0;
                break;

        case ETHER_STAT_ADV_CAP_PAUSE:
                v = (vrp->chip.mii.anadv & MII_ABILITY_PAUSE) != 0;
                break;

        case ETHER_STAT_ADV_REMFAULT:
                v = (vrp->chip.mii.anadv & MII_AN_ADVERT_REMFAULT) != 0;
                break;

        case ETHER_STAT_ALIGN_ERRORS:
                v = vrp->stats.ether_stat_align_errors;
                break;

        case ETHER_STAT_CAP_100T4:
                v = (vrp->chip.mii.status & MII_STATUS_100_BASE_T4) != 0;
                break;

        case ETHER_STAT_CAP_100FDX:
                v = (vrp->chip.mii.status & MII_STATUS_100_BASEX_FD) != 0;
                break;

        case ETHER_STAT_CAP_100HDX:
                v = (vrp->chip.mii.status & MII_STATUS_100_BASEX) != 0;
                break;

        case ETHER_STAT_CAP_10FDX:
                v = (vrp->chip.mii.status & MII_STATUS_10_FD) != 0;
                break;

        case ETHER_STAT_CAP_10HDX:
                v = (vrp->chip.mii.status & MII_STATUS_10) != 0;
                break;

        case ETHER_STAT_CAP_ASMPAUSE:
                v = 0;
                break;

        case ETHER_STAT_CAP_AUTONEG:
                v = (vrp->chip.mii.status & MII_STATUS_CANAUTONEG) != 0;
                break;

        case ETHER_STAT_CAP_PAUSE:
                v = 1;
                break;

        case ETHER_STAT_CAP_REMFAULT:
                v = (vrp->chip.mii.status & MII_STATUS_REMFAULT) != 0;
                break;

        case ETHER_STAT_CARRIER_ERRORS:
                /*
                 * Number of times carrier was lost or never detected on a
                 * transmission attempt.
                 */
                v = vrp->stats.ether_stat_carrier_errors;
                break;

        case ETHER_STAT_JABBER_ERRORS:
                return (ENOTSUP);

        case ETHER_STAT_DEFER_XMTS:
                /*
                 * Packets without collisions where first transmit attempt was
                 * delayed because the medium was busy.
                 */
                v = vrp->stats.ether_stat_defer_xmts;
                break;

        case ETHER_STAT_EX_COLLISIONS:
                /*
                 * Frames where excess collisions occurred on transmit, causing
                 * transmit failure.
                 */
                v = vrp->stats.ether_stat_ex_collisions;
                break;

        case ETHER_STAT_FCS_ERRORS:
                /*
                 * Packets received with CRC errors.
                 */
                v = vrp->stats.ether_stat_fcs_errors;
                break;

        case ETHER_STAT_FIRST_COLLISIONS:
                /*
                 * Packets successfully transmitted with exactly one collision.
                 */
                v = vrp->stats.ether_stat_first_collisions;
                break;

        case ETHER_STAT_LINK_ASMPAUSE:
                v = 0;
                break;

        case ETHER_STAT_LINK_AUTONEG:
                v = (vrp->chip.mii.control & MII_CONTROL_ANE) != 0 &&
                    (vrp->chip.mii.status & MII_STATUS_ANDONE) != 0;
                break;

        case ETHER_STAT_LINK_DUPLEX:
                v = vrp->chip.link.duplex;
                break;

        case ETHER_STAT_LINK_PAUSE:
                v = vrp->chip.link.flowctrl;
                break;

        case ETHER_STAT_LP_CAP_100T4:
                v = (vrp->chip.mii.lpable & MII_ABILITY_100BASE_T4) != 0;
                break;

        case ETHER_STAT_LP_CAP_1000FDX:
                v = 0;
                break;

        case ETHER_STAT_LP_CAP_1000HDX:
                v = 0;
                break;

        case ETHER_STAT_LP_CAP_100FDX:
                v = (vrp->chip.mii.lpable & MII_ABILITY_100BASE_TX_FD) != 0;
                break;

        case ETHER_STAT_LP_CAP_100HDX:
                v = (vrp->chip.mii.lpable & MII_ABILITY_100BASE_TX) != 0;
                break;

        case ETHER_STAT_LP_CAP_10FDX:
                v = (vrp->chip.mii.lpable & MII_ABILITY_10BASE_T_FD) != 0;
                break;

        case ETHER_STAT_LP_CAP_10HDX:
                v = (vrp->chip.mii.lpable & MII_ABILITY_10BASE_T) != 0;
                break;

        case ETHER_STAT_LP_CAP_ASMPAUSE:
                v = 0;
                break;

        case ETHER_STAT_LP_CAP_AUTONEG:
                v = (vrp->chip.mii.anexp & MII_AN_EXP_LPCANAN) != 0;
                break;

        case ETHER_STAT_LP_CAP_PAUSE:
                v = (vrp->chip.mii.lpable & MII_ABILITY_PAUSE) != 0;
                break;

        case ETHER_STAT_LP_REMFAULT:
                v = (vrp->chip.mii.status & MII_STATUS_REMFAULT) != 0;
                break;

        case ETHER_STAT_MACRCV_ERRORS:
                /*
                 * Packets received with MAC errors, except align_errors,
                 * fcs_errors, and toolong_errors.
                 */
                v = vrp->stats.ether_stat_macrcv_errors;
                break;

        case ETHER_STAT_MACXMT_ERRORS:
                /*
                 * Packets encountering transmit MAC failures, except carrier
                 * and collision failures.
                 */
                v = vrp->stats.ether_stat_macxmt_errors;
                break;

        case ETHER_STAT_MULTI_COLLISIONS:
                /*
                 * Packets successfully transmitted with multiple collisions.
                 */
                v = vrp->stats.ether_stat_multi_collisions;
                break;

        case ETHER_STAT_SQE_ERRORS:
                /*
                 * Number of times signal quality error was reported
                 * This one is reported by the PHY.
                 */
                return (ENOTSUP);

        case ETHER_STAT_TOOLONG_ERRORS:
                /*
                 * Packets received larger than the maximum permitted length.
                 */
                v = vrp->stats.ether_stat_toolong_errors;
                break;

        case ETHER_STAT_TOOSHORT_ERRORS:
                v = vrp->stats.ether_stat_tooshort_errors;
                break;

        case ETHER_STAT_TX_LATE_COLLISIONS:
                /*
                 * Number of times a transmit collision occurred late
                 * (after 512 bit times).
                 */
                v = vrp->stats.ether_stat_tx_late_collisions;
                break;

        case ETHER_STAT_XCVR_ADDR:
                /*
                 * MII address in the 0 to 31 range of the physical layer
                 * device in use for a given Ethernet device.
                 */
                v = vrp->chip.phyaddr;
                break;

        case ETHER_STAT_XCVR_ID:
                /*
                 * MII transceiver manufacturer and device ID.
                 */
                v = (vrp->chip.mii.identh << 16) | vrp->chip.mii.identl;
                break;

        case ETHER_STAT_XCVR_INUSE:
                v = vrp->chip.link.mau;
                break;

        case MAC_STAT_BRDCSTRCV:
                v = vrp->stats.mac_stat_brdcstrcv;
                break;

        case MAC_STAT_BRDCSTXMT:
                v = vrp->stats.mac_stat_brdcstxmt;
                break;

        case MAC_STAT_MULTIXMT:
                v = vrp->stats.mac_stat_multixmt;
                break;

        case MAC_STAT_COLLISIONS:
                v = vrp->stats.mac_stat_collisions;
                break;

        case MAC_STAT_IERRORS:
                v = vrp->stats.mac_stat_ierrors;
                break;

        case MAC_STAT_IFSPEED:
                if (vrp->chip.link.speed == VR_LINK_SPEED_100MBS)
                        v = 100 * 1000 * 1000;
                else if (vrp->chip.link.speed == VR_LINK_SPEED_10MBS)
                        v = 10 * 1000 * 1000;
                else
                        v = 0;
                break;

        case MAC_STAT_IPACKETS:
                v = vrp->stats.mac_stat_ipackets;
                break;

        case MAC_STAT_MULTIRCV:
                v = vrp->stats.mac_stat_multircv;
                break;

        case MAC_STAT_NORCVBUF:
                vrp->stats.mac_stat_norcvbuf +=
                    VR_GET16(vrp->acc_reg, VR_TALLY_MPA);
                VR_PUT16(vrp->acc_reg, VR_TALLY_MPA, 0);
                v = vrp->stats.mac_stat_norcvbuf;
                break;

        case MAC_STAT_NOXMTBUF:
                v = vrp->stats.mac_stat_noxmtbuf;
                break;

        case MAC_STAT_OBYTES:
                v = vrp->stats.mac_stat_obytes;
                break;

        case MAC_STAT_OERRORS:
                v = vrp->stats.ether_stat_macxmt_errors +
                    vrp->stats.mac_stat_underflows +
                    vrp->stats.ether_stat_align_errors +
                    vrp->stats.ether_stat_carrier_errors +
                    vrp->stats.ether_stat_fcs_errors;
                break;

        case MAC_STAT_OPACKETS:
                v = vrp->stats.mac_stat_opackets;
                break;

        case MAC_STAT_RBYTES:
                v = vrp->stats.mac_stat_rbytes;
                break;

        case MAC_STAT_UNKNOWNS:
                /*
                 * Isn't this something for the MAC layer to maintain?
                 */
                return (ENOTSUP);

        case MAC_STAT_UNDERFLOWS:
                v = vrp->stats.mac_stat_underflows;
                break;

        case MAC_STAT_OVERFLOWS:
                v = vrp->stats.mac_stat_overflows;
                break;
        }
        *val = v;
        return (0);
}

int
vr_mac_set_ether_addr(void *p, const uint8_t *ea)
{
        vr_t    *vrp;
        int     i;

        vrp = (vr_t *)p;
        mutex_enter(&vrp->oplock);
        mutex_enter(&vrp->intrlock);

        /*
         * Set a new station address.
         */
        for (i = 0; i < ETHERADDRL; i++)
                VR_PUT8(vrp->acc_reg, VR_ETHERADDR + i, ea[i]);

        mutex_exit(&vrp->intrlock);
        mutex_exit(&vrp->oplock);
        return (0);
}

/*
 * Configure the ethernet link according to param and chip.mii.
 */
static void
vr_link_init(vr_t *vrp)
{
        ASSERT(mutex_owned(&vrp->oplock));
        if ((vrp->chip.mii.control & MII_CONTROL_ANE) != 0) {
                /*
                 * If we do autoneg, ensure restart autoneg is ON.
                 */
                vrp->chip.mii.control |= MII_CONTROL_RSAN;

                /*
                 * The advertisements are prepared by param_init.
                 */
                vr_phy_write(vrp, MII_AN_ADVERT, vrp->chip.mii.anadv);
        } else {
                /*
                 * If we don't autoneg, we need speed, duplex and flowcontrol
                 * to configure the link. However, dladm doesn't allow changes
                 * to speed and duplex (readonly). The way this is solved
                 * (ahem) is to select the highest enabled combination
                 * Speed and duplex should be r/w when autoneg is off.
                 */
                if ((vrp->param.anadv_en &
                    MII_ABILITY_100BASE_TX_FD) != 0) {
                        vrp->chip.mii.control |= MII_CONTROL_100MB;
                        vrp->chip.mii.control |= MII_CONTROL_FDUPLEX;
                } else if ((vrp->param.anadv_en &
                    MII_ABILITY_100BASE_TX) != 0) {
                        vrp->chip.mii.control |= MII_CONTROL_100MB;
                        vrp->chip.mii.control &= ~MII_CONTROL_FDUPLEX;
                } else if ((vrp->param.anadv_en &
                    MII_ABILITY_10BASE_T_FD) != 0) {
                        vrp->chip.mii.control |= MII_CONTROL_FDUPLEX;
                        vrp->chip.mii.control &= ~MII_CONTROL_100MB;
                } else {
                        vrp->chip.mii.control &= ~MII_CONTROL_100MB;
                        vrp->chip.mii.control &= ~MII_CONTROL_FDUPLEX;
                }
        }
        /*
         * Write the control register.
         */
        vr_phy_write(vrp, MII_CONTROL, vrp->chip.mii.control);

        /*
         * With autoneg off we cannot rely on the link_change interrupt for
         * for getting the status into the driver.
         */
        if ((vrp->chip.mii.control & MII_CONTROL_ANE) == 0) {
                vr_link_state(vrp);
                mac_link_update(vrp->machdl,
                    (link_state_t)vrp->chip.link.state);
        }
}

/*
 * Get link state in the driver and configure the MAC accordingly.
 */
static void
vr_link_state(vr_t *vrp)
{
        uint16_t                mask;

        ASSERT(mutex_owned(&vrp->oplock));

        vr_phy_read(vrp, MII_STATUS, &vrp->chip.mii.status);
        vr_phy_read(vrp, MII_CONTROL, &vrp->chip.mii.control);
        vr_phy_read(vrp, MII_AN_ADVERT, &vrp->chip.mii.anadv);
        vr_phy_read(vrp, MII_AN_LPABLE, &vrp->chip.mii.lpable);
        vr_phy_read(vrp, MII_AN_EXPANSION, &vrp->chip.mii.anexp);

        /*
         * If we did autongeg, deduce the link type/speed by selecting the
         * highest common denominator.
         */
        if ((vrp->chip.mii.control & MII_CONTROL_ANE) != 0) {
                mask = vrp->chip.mii.anadv & vrp->chip.mii.lpable;
                if ((mask & MII_ABILITY_100BASE_TX_FD) != 0) {
                        vrp->chip.link.speed = VR_LINK_SPEED_100MBS;
                        vrp->chip.link.duplex = VR_LINK_DUPLEX_FULL;
                        vrp->chip.link.mau = VR_MAU_100X;
                } else if ((mask & MII_ABILITY_100BASE_T4) != 0) {
                        vrp->chip.link.speed = VR_LINK_SPEED_100MBS;
                        vrp->chip.link.duplex = VR_LINK_DUPLEX_HALF;
                        vrp->chip.link.mau = VR_MAU_100T4;
                } else if ((mask & MII_ABILITY_100BASE_TX) != 0) {
                        vrp->chip.link.speed = VR_LINK_SPEED_100MBS;
                        vrp->chip.link.duplex = VR_LINK_DUPLEX_HALF;
                        vrp->chip.link.mau = VR_MAU_100X;
                } else if ((mask & MII_ABILITY_10BASE_T_FD) != 0) {
                        vrp->chip.link.speed = VR_LINK_SPEED_10MBS;
                        vrp->chip.link.duplex = VR_LINK_DUPLEX_FULL;
                        vrp->chip.link.mau = VR_MAU_10;
                } else if ((mask & MII_ABILITY_10BASE_T) != 0) {
                        vrp->chip.link.speed = VR_LINK_SPEED_10MBS;
                        vrp->chip.link.duplex = VR_LINK_DUPLEX_HALF;
                        vrp->chip.link.mau = VR_MAU_10;
                } else {
                        vrp->chip.link.speed = VR_LINK_SPEED_UNKNOWN;
                        vrp->chip.link.duplex = VR_LINK_DUPLEX_UNKNOWN;
                        vrp->chip.link.mau = VR_MAU_UNKNOWN;
                }

                /*
                 * Did we negotiate pause?
                 */
                if ((mask & MII_ABILITY_PAUSE) != 0 &&
                    vrp->chip.link.duplex == VR_LINK_DUPLEX_FULL)
                        vrp->chip.link.flowctrl = VR_PAUSE_BIDIRECTIONAL;
                else
                        vrp->chip.link.flowctrl = VR_PAUSE_NONE;

                /*
                 * Did either one detect a AN fault?
                 */
                if ((vrp->chip.mii.status & MII_STATUS_REMFAULT) != 0)
                        vr_log(vrp, CE_WARN,
                            "AN remote fault reported by LP.");

                if ((vrp->chip.mii.lpable & MII_AN_ADVERT_REMFAULT) != 0)
                        vr_log(vrp, CE_WARN, "AN remote fault caused for LP.");
        } else {
                /*
                 * We didn't autoneg
                 * The link type is defined by the control register.
                 */
                if ((vrp->chip.mii.control & MII_CONTROL_100MB) != 0) {
                        vrp->chip.link.speed = VR_LINK_SPEED_100MBS;
                        vrp->chip.link.mau = VR_MAU_100X;
                } else {
                        vrp->chip.link.speed = VR_LINK_SPEED_10MBS;
                        vrp->chip.link.mau = VR_MAU_10;
                }

                if ((vrp->chip.mii.control & MII_CONTROL_FDUPLEX) != 0)
                        vrp->chip.link.duplex = VR_LINK_DUPLEX_FULL;
                else {
                        vrp->chip.link.duplex = VR_LINK_DUPLEX_HALF;
                        /*
                         * No pause on HDX links.
                         */
                        vrp->chip.link.flowctrl = VR_PAUSE_NONE;
                }
        }

        /*
         * Set the duplex mode on the MAC according to that of the PHY.
         */
        if (vrp->chip.link.duplex == VR_LINK_DUPLEX_FULL) {
                VR_SETBIT8(vrp->acc_reg, VR_CTRL1, VR_CTRL1_MACFULLDUPLEX);
                /*
                 * Enable packet queueing on FDX links.
                 */
                if ((vrp->chip.info.bugs & VR_BUG_NO_TXQUEUEING) == 0)
                        VR_CLRBIT8(vrp->acc_reg, VR_CFGB, VR_CFGB_QPKTDIS);
        } else {
                VR_CLRBIT8(vrp->acc_reg, VR_CTRL1, VR_CTRL1_MACFULLDUPLEX);
                /*
                 * Disable packet queueing on HDX links. With queueing enabled,
                 * this MAC get's lost after a TX abort (too many colisions).
                 */
                VR_SETBIT8(vrp->acc_reg, VR_CFGB, VR_CFGB_QPKTDIS);
        }

        /*
         * Set pause options on the MAC.
         */
        if (vrp->chip.link.flowctrl == VR_PAUSE_BIDIRECTIONAL) {
                /*
                 * All of our MAC's can receive pause frames.
                 */
                VR_SETBIT8(vrp->acc_reg, VR_MISC0, VR_MISC0_FDXRFEN);

                /*
                 * VT6105 and above can transmit pause frames.
                 */
                if ((vrp->chip.info.features & VR_FEATURE_TX_PAUSE_CAP) != 0) {
                        /*
                         * Set the number of available receive descriptors
                         * Non-zero values written to this register are added
                         * to the register's contents. Careful: Writing zero
                         * clears the register and thus causes a (long) pause
                         * request.
                         */
                        VR_PUT8(vrp->acc_reg, VR_FCR0_RXBUFCOUNT,
                            MIN(vrp->rx.ndesc, 0xFF) -
                            VR_GET8(vrp->acc_reg,
                            VR_FCR0_RXBUFCOUNT));

                        /*
                         * Request pause when we have 4 descs left.
                         */
                        VR_SETBITS8(vrp->acc_reg, VR_FCR1,
                            VR_FCR1_PAUSEONBITS, VR_FCR1_PAUSEON_04);

                        /*
                         * Cancel the pause when there are 24 descriptors again.
                         */
                        VR_SETBITS8(vrp->acc_reg, VR_FCR1,
                            VR_FCR1_PAUSEOFFBITS, VR_FCR1_PAUSEOFF_24);

                        /*
                         * Request a pause of FFFF bit-times. This long pause
                         * is cancelled when the high watermark is reached.
                         */
                        VR_PUT16(vrp->acc_reg, VR_FCR2_PAUSE, 0xFFFF);

                        /*
                         * Enable flow control on the MAC.
                         */
                        VR_SETBIT8(vrp->acc_reg, VR_MISC0, VR_MISC0_FDXTFEN);
                        VR_SETBIT8(vrp->acc_reg, VR_FCR1, VR_FCR1_FD_RX_EN |
                            VR_FCR1_FD_TX_EN | VR_FCR1_XONXOFF_EN);
                }
        } else {
                /*
                 * Turn flow control OFF.
                 */
                VR_CLRBIT8(vrp->acc_reg,
                    VR_MISC0, VR_MISC0_FDXRFEN | VR_MISC0_FDXTFEN);
                if ((vrp->chip.info.features & VR_FEATURE_TX_PAUSE_CAP) != 0) {
                        VR_CLRBIT8(vrp->acc_reg, VR_FCR1,
                            VR_FCR1_FD_RX_EN | VR_FCR1_FD_TX_EN |
                            VR_FCR1_XONXOFF_EN);
                }
        }

        /*
         * Set link state.
         */
        if ((vrp->chip.mii.status & MII_STATUS_LINKUP) != 0)
                vrp->chip.link.state = VR_LINK_STATE_UP;
        else
                vrp->chip.link.state = VR_LINK_STATE_DOWN;
}

/*
 * The PHY is automatically polled by the MAC once per 1024 MD clock cycles
 * MD is clocked once per 960ns so polling happens about every 1M ns, some
 * 1000 times per second
 * This polling process is required for the functionality of the link change
 * interrupt. Polling process must be disabled in order to access PHY registers
 * using MDIO
 *
 * Turn off PHY polling so that the PHY registers can be accessed.
 */
static void
vr_phy_autopoll_disable(vr_t *vrp)
{
        uint32_t        time;
        uint8_t         miicmd, miiaddr;

        /*
         * Special procedure to stop the autopolling.
         */
        if ((vrp->chip.info.bugs & VR_BUG_MIIPOLLSTOP) != 0) {
                /*
                 * If polling is enabled.
                 */
                miicmd = VR_GET8(vrp->acc_reg, VR_MIICMD);
                if ((miicmd & VR_MIICMD_MD_AUTO) != 0) {
                        /*
                         * Wait for the end of a cycle (mdone set).
                         */
                        time = 0;
                        do {
                                drv_usecwait(10);
                                if (time >= VR_MMI_WAITMAX) {
                                        vr_log(vrp, CE_WARN,
                                            "Timeout in "
                                            "disable MII polling");
                                        break;
                                }
                                time += VR_MMI_WAITINCR;
                                miiaddr = VR_GET8(vrp->acc_reg, VR_MIIADDR);
                        } while ((miiaddr & VR_MIIADDR_MDONE) == 0);
                }
                /*
                 * Once paused, we can disable autopolling.
                 */
                VR_PUT8(vrp->acc_reg, VR_MIICMD, 0);
        } else {
                /*
                 * Turn off MII polling.
                 */
                VR_PUT8(vrp->acc_reg, VR_MIICMD, 0);

                /*
                 * Wait for MIDLE in MII address register.
                 */
                time = 0;
                do {
                        drv_usecwait(VR_MMI_WAITINCR);
                        if (time >= VR_MMI_WAITMAX) {
                                vr_log(vrp, CE_WARN,
                                    "Timeout in disable MII polling");
                                break;
                        }
                        time += VR_MMI_WAITINCR;
                        miiaddr = VR_GET8(vrp->acc_reg, VR_MIIADDR);
                } while ((miiaddr & VR_MIIADDR_MIDLE) == 0);
        }
}

/*
 * Turn on PHY polling. PHY's registers cannot be accessed.
 */
static void
vr_phy_autopoll_enable(vr_t *vrp)
{
        uint32_t        time;

        VR_PUT8(vrp->acc_reg, VR_MIICMD, 0);
        VR_PUT8(vrp->acc_reg, VR_MIIADDR, MII_STATUS|VR_MIIADDR_MAUTO);
        VR_PUT8(vrp->acc_reg, VR_MIICMD, VR_MIICMD_MD_AUTO);

        /*
         * Wait for the polling process to finish.
         */
        time = 0;
        do {
                drv_usecwait(VR_MMI_WAITINCR);
                if (time >= VR_MMI_WAITMAX) {
                        vr_log(vrp, CE_NOTE, "Timeout in enable MII polling");
                        break;
                }
                time += VR_MMI_WAITINCR;
        } while ((VR_GET8(vrp->acc_reg, VR_MIIADDR) & VR_MIIADDR_MDONE) == 0);

        /*
         * Initiate a polling.
         */
        VR_SETBIT8(vrp->acc_reg, VR_MIIADDR, VR_MIIADDR_MAUTO);
}

/*
 * Read a register from the PHY using MDIO.
 */
static void
vr_phy_read(vr_t *vrp, int offset, uint16_t *value)
{
        uint32_t        time;

        vr_phy_autopoll_disable(vrp);

        /*
         * Write the register number to the lower 5 bits of the MII address
         * register.
         */
        VR_SETBITS8(vrp->acc_reg, VR_MIIADDR, VR_MIIADDR_BITS, offset);

        /*
         * Write a READ command to the MII control register
         * This bit will be cleared when the read is finished.
         */
        VR_SETBIT8(vrp->acc_reg, VR_MIICMD, VR_MIICMD_MD_READ);

        /*
         * Wait until the read is done.
         */
        time = 0;
        do {
                drv_usecwait(VR_MMI_WAITINCR);
                if (time >= VR_MMI_WAITMAX) {
                        vr_log(vrp, CE_NOTE, "Timeout in MII read command");
                        break;
                }
                time += VR_MMI_WAITINCR;
        } while ((VR_GET8(vrp->acc_reg, VR_MIICMD) & VR_MIICMD_MD_READ) != 0);

        *value = VR_GET16(vrp->acc_reg, VR_MIIDATA);
        vr_phy_autopoll_enable(vrp);
}

/*
 * Write to a PHY's register.
 */
static void
vr_phy_write(vr_t *vrp, int offset, uint16_t value)
{
        uint32_t        time;

        vr_phy_autopoll_disable(vrp);

        /*
         * Write the register number to the MII address register.
         */
        VR_SETBITS8(vrp->acc_reg, VR_MIIADDR, VR_MIIADDR_BITS, offset);

        /*
         * Write the value to the data register.
         */
        VR_PUT16(vrp->acc_reg, VR_MIIDATA, value);

        /*
         * Issue the WRITE command to the command register.
         * This bit will be cleared when the write is finished.
         */
        VR_SETBIT8(vrp->acc_reg, VR_MIICMD, VR_MIICMD_MD_WRITE);

        time = 0;
        do {
                drv_usecwait(VR_MMI_WAITINCR);
                if (time >= VR_MMI_WAITMAX) {
                        vr_log(vrp, CE_NOTE, "Timeout in MII write command");
                        break;
                }
                time += VR_MMI_WAITINCR;
        } while ((VR_GET8(vrp->acc_reg, VR_MIICMD) & VR_MIICMD_MD_WRITE) != 0);
        vr_phy_autopoll_enable(vrp);
}

/*
 * Initialize and install some private kstats.
 */
typedef struct {
        char            *name;
        uchar_t         type;
} vr_kstat_t;

static const vr_kstat_t vr_driver_stats [] = {
        {"allocbfail",          KSTAT_DATA_INT32},
        {"intr_claimed",        KSTAT_DATA_INT64},
        {"intr_unclaimed",      KSTAT_DATA_INT64},
        {"linkchanges",         KSTAT_DATA_INT64},
        {"txnfree",             KSTAT_DATA_INT32},
        {"txstalls",            KSTAT_DATA_INT32},
        {"resets",              KSTAT_DATA_INT32},
        {"txreclaims",          KSTAT_DATA_INT64},
        {"txreclaim0",          KSTAT_DATA_INT64},
        {"cyclics",             KSTAT_DATA_INT64},
        {"txchecks",            KSTAT_DATA_INT64},
};

static void
vr_kstats_init(vr_t *vrp)
{
        kstat_t                 *ksp;
        struct  kstat_named     *knp;
        int                     i;
        int                     nstats;

        nstats = sizeof (vr_driver_stats) / sizeof (vr_kstat_t);

        ksp = kstat_create(MODULENAME, ddi_get_instance(vrp->devinfo),
            "driver", "net", KSTAT_TYPE_NAMED, nstats, 0);

        if (ksp == NULL)
                vr_log(vrp, CE_WARN, "kstat_create failed");

        ksp->ks_update = vr_update_kstats;
        ksp->ks_private = (void*) vrp;
        knp = ksp->ks_data;

        for (i = 0; i < nstats; i++, knp++) {
                kstat_named_init(knp, vr_driver_stats[i].name,
                    vr_driver_stats[i].type);
        }
        kstat_install(ksp);
        vrp->ksp = ksp;
}

static int
vr_update_kstats(kstat_t *ksp, int access)
{
        vr_t                    *vrp;
        struct kstat_named      *knp;

        vrp = (vr_t *)ksp->ks_private;
        knp = ksp->ks_data;

        if (access != KSTAT_READ)
                return (EACCES);

        (knp++)->value.ui32 = vrp->stats.allocbfail;
        (knp++)->value.ui64 = vrp->stats.intr_claimed;
        (knp++)->value.ui64 = vrp->stats.intr_unclaimed;
        (knp++)->value.ui64 = vrp->stats.linkchanges;
        (knp++)->value.ui32 = vrp->tx.nfree;
        (knp++)->value.ui32 = vrp->stats.txstalls;
        (knp++)->value.ui32 = vrp->stats.resets;
        (knp++)->value.ui64 = vrp->stats.txreclaims;
        (knp++)->value.ui64 = vrp->stats.txreclaim0;
        (knp++)->value.ui64 = vrp->stats.cyclics;
        (knp++)->value.ui64 = vrp->stats.txchecks;
        return (0);
}

/*
 * Remove 'private' kstats.
 */
static void
vr_remove_kstats(vr_t *vrp)
{
        if (vrp->ksp != NULL)
                kstat_delete(vrp->ksp);
}

/*
 * Get a property of the device/driver
 * Remarks:
 * - pr_val is always an integer of size pr_valsize
 * - ENABLED (EN) is what is configured via dladm
 * - ADVERTISED (ADV) is ENABLED minus constraints, like PHY/MAC capabilities
 * - DEFAULT are driver- and hardware defaults (DEFAULT is implemented as a
 *   flag in pr_flags instead of MAC_PROP_DEFAULT_)
 * - perm is the permission printed on ndd -get /.. \?
 */
int
vr_mac_getprop(void *arg, const char *pr_name, mac_prop_id_t pr_num,
    uint_t pr_valsize, void *pr_val)
{
        vr_t            *vrp;
        uint32_t        err;
        uint64_t        val;

        /* Since we have no private properties */
        _NOTE(ARGUNUSED(pr_name))

        err = 0;
        vrp = (vr_t *)arg;
        switch (pr_num) {
                case MAC_PROP_ADV_1000FDX_CAP:
                case MAC_PROP_ADV_1000HDX_CAP:
                case MAC_PROP_EN_1000FDX_CAP:
                case MAC_PROP_EN_1000HDX_CAP:
                        val = 0;
                        break;

                case MAC_PROP_ADV_100FDX_CAP:
                        val = (vrp->chip.mii.anadv &
                            MII_ABILITY_100BASE_TX_FD) != 0;
                        break;

                case MAC_PROP_ADV_100HDX_CAP:
                        val = (vrp->chip.mii.anadv &
                            MII_ABILITY_100BASE_TX) != 0;
                        break;

                case MAC_PROP_ADV_100T4_CAP:
                        val = (vrp->chip.mii.anadv &
                            MII_ABILITY_100BASE_T4) != 0;
                        break;

                case MAC_PROP_ADV_10FDX_CAP:
                        val = (vrp->chip.mii.anadv &
                            MII_ABILITY_10BASE_T_FD) != 0;
                        break;

                case MAC_PROP_ADV_10HDX_CAP:
                        val = (vrp->chip.mii.anadv &
                            MII_ABILITY_10BASE_T) != 0;
                        break;

                case MAC_PROP_AUTONEG:
                        val = (vrp->chip.mii.control &
                            MII_CONTROL_ANE) != 0;
                        break;

                case MAC_PROP_DUPLEX:
                        val = vrp->chip.link.duplex;
                        break;

                case MAC_PROP_EN_100FDX_CAP:
                        val = (vrp->param.anadv_en &
                            MII_ABILITY_100BASE_TX_FD) != 0;
                        break;

                case MAC_PROP_EN_100HDX_CAP:
                        val = (vrp->param.anadv_en &
                            MII_ABILITY_100BASE_TX) != 0;
                        break;

                case MAC_PROP_EN_100T4_CAP:
                        val = (vrp->param.anadv_en &
                            MII_ABILITY_100BASE_T4) != 0;
                        break;

                case MAC_PROP_EN_10FDX_CAP:
                        val = (vrp->param.anadv_en &
                            MII_ABILITY_10BASE_T_FD) != 0;
                        break;

                case MAC_PROP_EN_10HDX_CAP:
                        val = (vrp->param.anadv_en &
                            MII_ABILITY_10BASE_T) != 0;
                        break;

                case MAC_PROP_EN_AUTONEG:
                        val = vrp->param.an_en == VR_LINK_AUTONEG_ON;
                        break;

                case MAC_PROP_FLOWCTRL:
                        val = vrp->chip.link.flowctrl;
                        break;

                case MAC_PROP_MTU:
                        val = vrp->param.mtu;
                        break;

                case MAC_PROP_SPEED:
                        if (vrp->chip.link.speed ==
                            VR_LINK_SPEED_100MBS)
                                val = 100 * 1000 * 1000;
                        else if (vrp->chip.link.speed ==
                            VR_LINK_SPEED_10MBS)
                                val = 10 * 1000 * 1000;
                        else
                                val = 0;
                        break;

                case MAC_PROP_STATUS:
                        val = vrp->chip.link.state;
                        break;

                default:
                        err = ENOTSUP;
                        break;
        }

        if (err == 0 && pr_num != MAC_PROP_PRIVATE) {
                if (pr_valsize == sizeof (uint64_t))
                        *(uint64_t *)pr_val = val;
                else if (pr_valsize == sizeof (uint32_t))
                        *(uint32_t *)pr_val = val;
                else if (pr_valsize == sizeof (uint16_t))
                        *(uint16_t *)pr_val = val;
                else if (pr_valsize == sizeof (uint8_t))
                        *(uint8_t *)pr_val = val;
                else
                        err = EINVAL;
        }
        return (err);
}

void
vr_mac_propinfo(void *arg, const char *pr_name, mac_prop_id_t pr_num,
    mac_prop_info_handle_t prh)
{
        vr_t            *vrp = (vr_t *)arg;
        uint8_t         val, perm;

        /* Since we have no private properties */
        _NOTE(ARGUNUSED(pr_name))

        switch (pr_num) {
                case MAC_PROP_ADV_1000FDX_CAP:
                case MAC_PROP_ADV_1000HDX_CAP:
                case MAC_PROP_EN_1000FDX_CAP:
                case MAC_PROP_EN_1000HDX_CAP:
                case MAC_PROP_ADV_100FDX_CAP:
                case MAC_PROP_ADV_100HDX_CAP:
                case MAC_PROP_ADV_100T4_CAP:
                case MAC_PROP_ADV_10FDX_CAP:
                case MAC_PROP_ADV_10HDX_CAP:
                        mac_prop_info_set_perm(prh, MAC_PROP_PERM_READ);
                        return;

                case MAC_PROP_EN_100FDX_CAP:
                        val = (vrp->chip.mii.status &
                            MII_STATUS_100_BASEX_FD) != 0;
                        break;

                case MAC_PROP_EN_100HDX_CAP:
                        val = (vrp->chip.mii.status &
                            MII_STATUS_100_BASEX) != 0;
                        break;

                case MAC_PROP_EN_100T4_CAP:
                        val = (vrp->chip.mii.status &
                            MII_STATUS_100_BASE_T4) != 0;
                        break;

                case MAC_PROP_EN_10FDX_CAP:
                        val = (vrp->chip.mii.status &
                            MII_STATUS_10_FD) != 0;
                        break;

                case MAC_PROP_EN_10HDX_CAP:
                        val = (vrp->chip.mii.status &
                            MII_STATUS_10) != 0;
                        break;

                case MAC_PROP_AUTONEG:
                case MAC_PROP_EN_AUTONEG:
                        val = (vrp->chip.mii.status &
                            MII_STATUS_CANAUTONEG) != 0;
                        break;

                case MAC_PROP_FLOWCTRL:
                        mac_prop_info_set_default_link_flowctrl(prh,
                            LINK_FLOWCTRL_BI);
                        return;

                case MAC_PROP_MTU:
                        mac_prop_info_set_range_uint32(prh,
                            ETHERMTU, ETHERMTU);
                        return;

                case MAC_PROP_DUPLEX:
                        /*
                         * Writability depends on autoneg.
                         */
                        perm = ((vrp->chip.mii.control &
                            MII_CONTROL_ANE) == 0) ? MAC_PROP_PERM_RW :
                            MAC_PROP_PERM_READ;
                        mac_prop_info_set_perm(prh, perm);

                        if (perm == MAC_PROP_PERM_RW) {
                                mac_prop_info_set_default_uint8(prh,
                                    VR_LINK_DUPLEX_FULL);
                        }
                        return;

                case MAC_PROP_SPEED:
                        perm = ((vrp->chip.mii.control &
                            MII_CONTROL_ANE) == 0) ?
                            MAC_PROP_PERM_RW : MAC_PROP_PERM_READ;
                        mac_prop_info_set_perm(prh, perm);

                        if (perm == MAC_PROP_PERM_RW) {
                                mac_prop_info_set_default_uint64(prh,
                                    100 * 1000 * 1000);
                        }
                        return;

                case MAC_PROP_STATUS:
                        mac_prop_info_set_perm(prh, MAC_PROP_PERM_READ);
                        return;

                default:
                        return;
                }

                mac_prop_info_set_default_uint8(prh, val);
}

/*
 * Set a property of the device.
 */
int
vr_mac_setprop(void *arg, const char *pr_name, mac_prop_id_t pr_num,
        uint_t pr_valsize, const void *pr_val)
{
        vr_t            *vrp;
        uint32_t        err;
        uint64_t        val;

        /* Since we have no private properties */
        _NOTE(ARGUNUSED(pr_name))

        err = 0;
        vrp = (vr_t *)arg;
        mutex_enter(&vrp->oplock);

        /*
         * The current set of public property values are passed as integers
         * Private properties are passed as strings in pr_val length pr_valsize.
         */
        if (pr_num != MAC_PROP_PRIVATE) {
                if (pr_valsize == sizeof (uint64_t))
                        val = *(uint64_t *)pr_val;
                else if (pr_valsize == sizeof (uint32_t))
                        val = *(uint32_t *)pr_val;
                else if (pr_valsize == sizeof (uint16_t))
                        val = *(uint32_t *)pr_val;
                else if (pr_valsize == sizeof (uint8_t))
                        val = *(uint8_t *)pr_val;
                else {
                        mutex_exit(&vrp->oplock);
                        return (EINVAL);
                }
        }

        switch (pr_num) {
                case MAC_PROP_DUPLEX:
                        if ((vrp->chip.mii.control & MII_CONTROL_ANE) == 0) {
                                if (val == LINK_DUPLEX_FULL)
                                        vrp->chip.mii.control |=
                                            MII_CONTROL_FDUPLEX;
                                else if (val == LINK_DUPLEX_HALF)
                                        vrp->chip.mii.control &=
                                            ~MII_CONTROL_FDUPLEX;
                                else
                                        err = EINVAL;
                        } else
                                err = EINVAL;
                        break;

                case MAC_PROP_EN_100FDX_CAP:
                        if (val == 0)
                                vrp->param.anadv_en &=
                                    ~MII_ABILITY_100BASE_TX_FD;
                        else
                                vrp->param.anadv_en |=
                                    MII_ABILITY_100BASE_TX_FD;
                        break;

                case MAC_PROP_EN_100HDX_CAP:
                        if (val == 0)
                                vrp->param.anadv_en &=
                                    ~MII_ABILITY_100BASE_TX;
                        else
                                vrp->param.anadv_en |=
                                    MII_ABILITY_100BASE_TX;
                        break;

                case MAC_PROP_EN_100T4_CAP:
                        if (val == 0)
                                vrp->param.anadv_en &=
                                    ~MII_ABILITY_100BASE_T4;
                        else
                                vrp->param.anadv_en |=
                                    MII_ABILITY_100BASE_T4;
                        break;

                case MAC_PROP_EN_10FDX_CAP:
                        if (val == 0)
                                vrp->param.anadv_en &=
                                    ~MII_ABILITY_10BASE_T_FD;
                        else
                                vrp->param.anadv_en |=
                                    MII_ABILITY_10BASE_T_FD;
                        break;

                case MAC_PROP_EN_10HDX_CAP:
                        if (val == 0)
                                vrp->param.anadv_en &=
                                    ~MII_ABILITY_10BASE_T;
                        else
                                vrp->param.anadv_en |=
                                    MII_ABILITY_10BASE_T;
                        break;

                case MAC_PROP_AUTONEG:
                case MAC_PROP_EN_AUTONEG:
                        if (val == 0) {
                                vrp->param.an_en = VR_LINK_AUTONEG_OFF;
                                vrp->chip.mii.control &= ~MII_CONTROL_ANE;
                        } else {
                                vrp->param.an_en = VR_LINK_AUTONEG_ON;
                                if ((vrp->chip.mii.status &
                                    MII_STATUS_CANAUTONEG) != 0)
                                        vrp->chip.mii.control |=
                                            MII_CONTROL_ANE;
                                else
                                        err = EINVAL;
                        }
                        break;

                case MAC_PROP_FLOWCTRL:
                        if (val == LINK_FLOWCTRL_NONE)
                                vrp->param.anadv_en &= ~MII_ABILITY_PAUSE;
                        else if (val == LINK_FLOWCTRL_BI)
                                vrp->param.anadv_en |= MII_ABILITY_PAUSE;
                        else
                                err = EINVAL;
                        break;

                case MAC_PROP_MTU:
                        if (val >= ETHERMIN && val <= ETHERMTU)
                                vrp->param.mtu = (uint32_t)val;
                        else
                                err = EINVAL;
                        break;

                case MAC_PROP_SPEED:
                        if (val == 10 * 1000 * 1000)
                                vrp->chip.link.speed =
                                    VR_LINK_SPEED_10MBS;
                        else if (val == 100 * 1000 * 1000)
                                vrp->chip.link.speed =
                                    VR_LINK_SPEED_100MBS;
                        else
                                err = EINVAL;
                        break;

                default:
                        err = ENOTSUP;
                        break;
        }
        if (err == 0 && pr_num != MAC_PROP_PRIVATE) {
                vrp->chip.mii.anadv = vrp->param.anadv_en &
                    (vrp->param.an_phymask & vrp->param.an_macmask);
                vr_link_init(vrp);
        }
        mutex_exit(&vrp->oplock);
        return (err);
}


/*
 * Logging and debug functions.
 */
static struct {
        kmutex_t mutex[1];
        const char *ifname;
        const char *fmt;
        int level;
} prtdata;

static void
vr_vprt(const char *fmt, va_list args)
{
        char buf[512];

        ASSERT(mutex_owned(prtdata.mutex));
        (void) vsnprintf(buf, sizeof (buf), fmt, args);
        cmn_err(prtdata.level, prtdata.fmt, prtdata.ifname, buf);
}

static void
vr_log(vr_t *vrp, int level, const char *fmt, ...)
{
        va_list args;

        mutex_enter(prtdata.mutex);
        prtdata.ifname = vrp->ifname;
        prtdata.fmt = "!%s: %s";
        prtdata.level = level;

        va_start(args, fmt);
        vr_vprt(fmt, args);
        va_end(args);

        mutex_exit(prtdata.mutex);
}

#if defined(DEBUG)
static void
vr_prt(const char *fmt, ...)
{
        va_list args;

        ASSERT(mutex_owned(prtdata.mutex));

        va_start(args, fmt);
        vr_vprt(fmt, args);
        va_end(args);

        mutex_exit(prtdata.mutex);
}

void
(*vr_debug())(const char *fmt, ...)
{
        mutex_enter(prtdata.mutex);
        prtdata.ifname = MODULENAME;
        prtdata.fmt = "^%s: %s\n";
        prtdata.level = CE_CONT;

        return (vr_prt);
}
#endif  /* DEBUG */

DDI_DEFINE_STREAM_OPS(vr_dev_ops, nulldev, nulldev, vr_attach, vr_detach,
nodev, NULL, D_MP, NULL, vr_quiesce);

static struct modldrv vr_modldrv = {
        &mod_driverops,         /* Type of module. This one is a driver */
        vr_ident,               /* short description */
        &vr_dev_ops             /* driver specific ops */
};

static struct modlinkage modlinkage = {
        MODREV_1, (void *)&vr_modldrv, NULL
};

int
_info(struct modinfo *modinfop)
{
        return (mod_info(&modlinkage, modinfop));
}

int
_init(void)
{
        int     status;

        mac_init_ops(&vr_dev_ops, MODULENAME);
        status = mod_install(&modlinkage);
        if (status == DDI_SUCCESS)
                mutex_init(prtdata.mutex, NULL, MUTEX_DRIVER, NULL);
        else
                mac_fini_ops(&vr_dev_ops);
        return (status);
}

int
_fini(void)
{
        int status;

        status = mod_remove(&modlinkage);
        if (status == 0) {
                mac_fini_ops(&vr_dev_ops);
                mutex_destroy(prtdata.mutex);
        }
        return (status);
}