io/aggr/aggr_dev.c

	aggr_dev.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*
 * IEEE 802.3ad Link Aggregation.
 */

#include <sys/types.h>
#include <sys/sysmacros.h>
#include <sys/conf.h>
#include <sys/cmn_err.h>
#include <sys/list.h>
#include <sys/ksynch.h>
#include <sys/kmem.h>
#include <sys/stream.h>
#include <sys/modctl.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/atomic.h>
#include <sys/stat.h>

#include <sys/aggr.h>
#include <sys/aggr_impl.h>

/* module description */
#define AGGR_LINKINFO   "Link Aggregation MAC"

/* device info ptr, only one for instance 0 */
dev_info_t *aggr_dip;

static void aggr_dev_init(void);
static int aggr_dev_fini(void);
static int aggr_getinfo(dev_info_t *, ddi_info_cmd_t, void *, void **);
static int aggr_attach(dev_info_t *, ddi_attach_cmd_t);
static int aggr_detach(dev_info_t *, ddi_detach_cmd_t);

static struct cb_ops aggr_cb_ops = {
    aggr_open,      /* open */
    aggr_close,     /* close */
    nulldev,        /* strategy */
    nulldev,        /* print */
    nodev,          /* dump */
    nodev,          /* read */
    nodev,          /* write */
    aggr_ioctl,     /* ioctl */
    nodev,          /* devmap */
    nodev,          /* mmap */
    nodev,          /* segmap */
    nochpoll,       /* poll */
    ddi_prop_op,        /* cb_prop_op */
    0,          /* streamtab  */
    D_NEW | D_MP        /* driver compatibility flag */
};

static struct dev_ops aggr_ops = {
    DEVO_REV,       /* devo_rev */
    0,          /* refcnt */
    aggr_getinfo,       /* getinfo */
    nulldev,        /* identify */
    nulldev,        /* probe */
    aggr_attach,        /* attach */
    aggr_detach,        /* detach */
    nodev,          /* reset */
    &aggr_cb_ops,       /* driver operations */
    NULL,           /* bus operations */
    nodev           /* dev power */
};

static struct modldrv modldrv = {
    &mod_driverops,
    AGGR_LINKINFO,
    &aggr_ops
};

static struct modlinkage    modlinkage = {
    MODREV_1,
    &modldrv,
    NULL
};

int
_init(void)
{
    int err;

    aggr_dev_init();

    if ((err = mod_install(&modlinkage)) != 0) {
        (void) aggr_dev_fini();
        return (err);
    }

    aggr_dip = NULL;

    return (0);
}

int
_fini(void)
{
    int err;

    if ((err = aggr_dev_fini()) != 0)
        return (err);

    if ((err = mod_remove(&modlinkage)) != 0) {
        aggr_dev_init();
        return (err);
    }

    return (0);
}

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

static void
aggr_dev_init(void)
{
    aggr_port_init();
    aggr_grp_init();
}

static int
aggr_dev_fini(void)
{
    int err;

    if ((err = aggr_grp_fini()) != 0)
        return (err);
    if ((err = aggr_port_fini()) != 0) {
        /*
         * re-initialize the groups to keep a consistent
         * state.
         */
        aggr_grp_init();
    }

    return (err);
}

/*ARGSUSED*/
static int
aggr_getinfo(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg,
    void **result)
{
    switch (infocmd) {
    case DDI_INFO_DEVT2DEVINFO:
        *result = aggr_dip;
        return (DDI_SUCCESS);
    case DDI_INFO_DEVT2INSTANCE:
        *result = NULL;
        return (DDI_SUCCESS);
    }
    return (DDI_FAILURE);
}

static int
aggr_attach(dev_info_t *dip, ddi_attach_cmd_t cmd)
{
    switch (cmd) {
    case DDI_ATTACH:
        if (ddi_get_instance(dip) != 0) {
            /* we only allow instance 0 to attach */
            return (DDI_FAILURE);
        }

        /* create minor node for control interface */
        if (ddi_create_minor_node(dip, AGGR_DEVNAME_CTL, S_IFCHR,
            AGGR_MINOR_CTL, DDI_PSEUDO, 0) != DDI_SUCCESS) {
            return (DDI_FAILURE);
        }

        aggr_dip = dip;
        return (DDI_SUCCESS);

    case DDI_RESUME:
        return (DDI_SUCCESS);

    default:
        return (DDI_FAILURE);
    }
}

/*ARGSUSED*/
static int
aggr_detach(dev_info_t *dip, ddi_detach_cmd_t cmd)
{
    switch (cmd) {
    case DDI_DETACH:
        aggr_dip = NULL;
        ddi_remove_minor_node(dip, NULL);

        return (DDI_SUCCESS);

    case DDI_SUSPEND:
        return (DDI_SUCCESS);

    default:
        return (DDI_FAILURE);
    }
}