clients/eoib/enx_misc.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 (c) 2010, Oracle and/or its affiliates. All rights reserved.
 */

#include <sys/types.h>
#include <sys/kmem.h>
#include <sys/ksynch.h>
#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/sunndi.h>

#include <sys/ib/clients/eoib/enx_impl.h>

static char *eibnx_make_nodename(eibnx_thr_info_t *, uint16_t);

/*
 * This routine is only called when the port-monitor thread is
 * about to die.  Between the time the first mcast solicitation
 * was done by the port-monitor thread and the time it is asked
 * to die, a lot of things could've happened and we need to
 * cleanup all of it.
 */
void
eibnx_cleanup_port_nodes(eibnx_thr_info_t *info)
{
    eibnx_t *ss = enx_global_ss;
    eibnx_nodeq_t *node;
    eibnx_nodeq_t *prev;
    eibnx_gw_info_t *gwi;
    eibnx_gw_info_t *gw_list;
    eibnx_gw_info_t *nxt_gwi;
    eibnx_child_t *child;
    eibnx_child_t *nxt_child;
    eibnx_child_t *children;

    /*
     * Since we would've already stopped processing completions for
     * this thread's work queue, we don't have to worry about requests
     * coming in for creation of new eoib nodes.  However, there may
     * be pending node creation requests for this port (thr_info)
     * that we will have to drop.
     */
    mutex_enter(&ss->nx_nodeq_lock);
    prev = NULL;
    for (node = ss->nx_nodeq; node; node = node->nc_next) {
        if (node->nc_info != info) {
            prev = node;
        } else {
            if (prev == NULL) {
                ss->nx_nodeq = node->nc_next;
            } else {
                prev->nc_next = node->nc_next;
            }
            kmem_free(node, sizeof (eibnx_nodeq_t));
        }
    }
    mutex_exit(&ss->nx_nodeq_lock);

    /*
     * Now go through the list of all children and free up any
     * resource we might've allocated;  note that the child dips
     * could've been offlined/removed by now, so we don't do
     * anything with them.
     */
    mutex_enter(&info->ti_child_lock);
    children = info->ti_child;
    info->ti_child = NULL;
    mutex_exit(&info->ti_child_lock);

    for (child = children; child; child = nxt_child) {
        nxt_child = child->ch_next;

        if (child->ch_node_name) {
            kmem_free(child->ch_node_name, MAXNAMELEN);
        }
        kmem_free(child, sizeof (eibnx_child_t));
    }

    /*
     * Return all the swqes we've acquired for the gateway unicast
     * solicitations, free any address vectors we've allocated and
     * finally free the gw entries from the list.
     */
    mutex_enter(&info->ti_gw_lock);
    gw_list = info->ti_gw;
    info->ti_gw = NULL;
    mutex_exit(&info->ti_gw_lock);

    for (gwi = gw_list; gwi; gwi = nxt_gwi) {
        nxt_gwi = gwi->gw_next;

        eibnx_release_swqe((eibnx_wqe_t *)(gwi->gw_swqe));
        if ((gwi->gw_addr).ga_vect) {
            kmem_free((gwi->gw_addr).ga_vect,
                sizeof (ibt_adds_vect_t));
            (gwi->gw_addr).ga_vect = NULL;
        }
        mutex_destroy(&gwi->gw_adv_lock);

        kmem_free(gwi, sizeof (eibnx_gw_info_t));
    }
}

/*
 * Communicate all the details we received about the gateway (via the
 * advertisement control message) to the eoib instance we're creating.
 */
void
eibnx_create_node_props(dev_info_t *dip, eibnx_thr_info_t *info,
    eibnx_gw_info_t *gwi)
{
    int ret;

    ret = ndi_prop_update_int64(DDI_DEV_T_NONE, dip, EIB_PROP_HCA_GUID,
        info->ti_hca_guid);
    if (ret != DDI_PROP_SUCCESS) {
        ENX_DPRINTF_WARN("ndi_prop_update_int64() failed to set "
            "%s property to 0x%llx for child dip 0x%llx, ret=%d",
            EIB_PROP_HCA_GUID, info->ti_hca_guid, dip, ret);
    }

    ret = ndi_prop_update_int(DDI_DEV_T_NONE, dip, EIB_PROP_HCA_PORTNUM,
        info->ti_pi->p_port_num);
    if (ret != DDI_PROP_SUCCESS) {
        ENX_DPRINTF_WARN("ndi_prop_update_int() failed to set "
            "%s property to 0x%lx for child dip 0x%llx, ret=%d",
            EIB_PROP_HCA_PORTNUM, info->ti_pi->p_port_num, dip, ret);
    }

    ret = ndi_prop_update_int64(DDI_DEV_T_NONE, dip, EIB_PROP_GW_SYS_GUID,
        gwi->gw_system_guid);
    if (ret != DDI_PROP_SUCCESS) {
        ENX_DPRINTF_WARN("ndi_prop_update_int64() failed to set "
            "%s property to 0x%llx for child dip 0x%llx, ret=%d",
            EIB_PROP_GW_SYS_GUID, gwi->gw_system_guid, dip, ret);
    }

    ret = ndi_prop_update_int64(DDI_DEV_T_NONE, dip, EIB_PROP_GW_GUID,
        gwi->gw_guid);
    if (ret != DDI_PROP_SUCCESS) {
        ENX_DPRINTF_WARN("ndi_prop_update_int64() failed to set "
            "%s property to 0x%llx for child dip 0x%llx, ret=%d",
            EIB_PROP_GW_GUID, gwi->gw_guid, dip, ret);
    }

    ret = ndi_prop_update_int64(DDI_DEV_T_NONE, dip, EIB_PROP_GW_SN_PREFIX,
        (gwi->gw_addr).ga_gid.gid_prefix);
    if (ret != DDI_PROP_SUCCESS) {
        ENX_DPRINTF_WARN("ndi_prop_update_int64() failed to set "
            "%s property to 0x%llx for child dip 0x%llx, ret=%d",
            EIB_PROP_GW_SN_PREFIX, (gwi->gw_addr).ga_gid.gid_prefix,
            dip, ret);
    }

    ret = ndi_prop_update_int(DDI_DEV_T_NONE, dip, EIB_PROP_GW_ADV_PERIOD,
        gwi->gw_adv_period);
    if (ret != DDI_PROP_SUCCESS) {
        ENX_DPRINTF_WARN("ndi_prop_update_int() failed to set "
            "%s property to 0x%lx for child dip 0x%llx, ret=%d",
            EIB_PROP_GW_ADV_PERIOD, gwi->gw_adv_period, dip, ret);
    }

    ret = ndi_prop_update_int(DDI_DEV_T_NONE, dip, EIB_PROP_GW_KA_PERIOD,
        gwi->gw_ka_period);
    if (ret != DDI_PROP_SUCCESS) {
        ENX_DPRINTF_WARN("ndi_prop_update_int() failed to set "
            "%s property to 0x%lx for child dip 0x%llx, ret=%d",
            EIB_PROP_GW_KA_PERIOD, gwi->gw_ka_period, dip, ret);
    }

    ret = ndi_prop_update_int(DDI_DEV_T_NONE, dip, EIB_PROP_VNIC_KA_PERIOD,
        gwi->gw_vnic_ka_period);
    if (ret != DDI_PROP_SUCCESS) {
        ENX_DPRINTF_WARN("ndi_prop_update_int() failed to set "
            "%s property to 0x%lx for child dip 0x%llx, ret=%d",
            EIB_PROP_VNIC_KA_PERIOD, gwi->gw_vnic_ka_period, dip, ret);
    }

    ret = ndi_prop_update_int(DDI_DEV_T_NONE, dip, EIB_PROP_GW_CTRL_QPN,
        gwi->gw_ctrl_qpn);
    if (ret != DDI_PROP_SUCCESS) {
        ENX_DPRINTF_WARN("ndi_prop_update_int() failed to set "
            "%s property to 0x%lx for child dip 0x%llx, ret=%d",
            EIB_PROP_GW_CTRL_QPN, gwi->gw_ctrl_qpn, dip, ret);
    }

    ret = ndi_prop_update_int(DDI_DEV_T_NONE, dip, EIB_PROP_GW_LID,
        gwi->gw_lid);
    if (ret != DDI_PROP_SUCCESS) {
        ENX_DPRINTF_WARN("ndi_prop_update_int() failed to set "
            "%s property to 0x%lx for child dip 0x%llx, ret=%d",
            EIB_PROP_GW_LID, gwi->gw_lid, dip, ret);
    }

    ret = ndi_prop_update_int(DDI_DEV_T_NONE, dip, EIB_PROP_GW_PORTID,
        gwi->gw_portid);
    if (ret != DDI_PROP_SUCCESS) {
        ENX_DPRINTF_WARN("ndi_prop_update_int() failed to set "
            "%s property to 0x%lx for child dip 0x%llx, ret=%d",
            EIB_PROP_GW_PORTID, gwi->gw_portid, dip, ret);
    }

    ret = ndi_prop_update_int(DDI_DEV_T_NONE, dip,
        EIB_PROP_GW_NUM_NET_VNICS, gwi->gw_num_net_vnics);
    if (ret != DDI_PROP_SUCCESS) {
        ENX_DPRINTF_WARN("ndi_prop_update_int() failed to set "
            "%s property to 0x%lx for child dip 0x%llx, ret=%d",
            EIB_PROP_GW_NUM_NET_VNICS, gwi->gw_num_net_vnics, dip, ret);
    }

    ret = ndi_prop_update_int(DDI_DEV_T_NONE, dip, EIB_PROP_GW_AVAILABLE,
        gwi->gw_flag_available);
    if (ret != DDI_PROP_SUCCESS) {
        ENX_DPRINTF_WARN("ndi_prop_update_int() failed to set "
            "%s property to 0x%lx for child dip 0x%llx, ret=%d",
            EIB_PROP_GW_AVAILABLE, gwi->gw_flag_available, dip, ret);
    }

    ret = ndi_prop_update_int(DDI_DEV_T_NONE, dip, EIB_PROP_GW_HOST_VNICS,
        gwi->gw_is_host_adm_vnics);
    if (ret != DDI_PROP_SUCCESS) {
        ENX_DPRINTF_WARN("ndi_prop_update_int() failed to set "
            "%s property to 0x%lx for child dip 0x%llx, ret=%d",
            EIB_PROP_GW_HOST_VNICS, gwi->gw_is_host_adm_vnics,
            dip, ret);
    }

    ret = ndi_prop_update_int(DDI_DEV_T_NONE, dip, EIB_PROP_GW_SL,
        gwi->gw_sl);
    if (ret != DDI_PROP_SUCCESS) {
        ENX_DPRINTF_WARN("ndi_prop_update_int() failed to set "
            "%s property to 0x%lx for child dip 0x%llx, ret=%d",
            EIB_PROP_GW_SL, gwi->gw_sl, dip, ret);
    }

    ret = ndi_prop_update_int(DDI_DEV_T_NONE, dip, EIB_PROP_GW_N_RSS_QPN,
        gwi->gw_n_rss_qpn);
    if (ret != DDI_PROP_SUCCESS) {
        ENX_DPRINTF_WARN("ndi_prop_update_int() failed to set "
            "%s property to 0x%lx for child dip 0x%llx, ret=%d",
            EIB_PROP_GW_N_RSS_QPN, gwi->gw_n_rss_qpn, dip, ret);
    }

    ret = ndi_prop_update_string(DDI_DEV_T_NONE, dip, EIB_PROP_GW_SYS_NAME,
        (char *)(gwi->gw_system_name));
    if (ret != DDI_PROP_SUCCESS) {
        ENX_DPRINTF_WARN("ndi_prop_update_string() failed to set "
            "%s property to '%s' for child dip 0x%llx, ret=%d",
            EIB_PROP_GW_SYS_NAME, gwi->gw_system_name, dip, ret);
    }

    ret = ndi_prop_update_string(DDI_DEV_T_NONE, dip, EIB_PROP_GW_PORT_NAME,
        (char *)(gwi->gw_port_name));
    if (ret != DDI_PROP_SUCCESS) {
        ENX_DPRINTF_WARN("ndi_prop_update_string() failed to set "
            "%s property to '%s' for child dip 0x%llx, ret=%d",
            EIB_PROP_GW_PORT_NAME, gwi->gw_port_name, dip, ret);
    }

    ret = ndi_prop_update_string(DDI_DEV_T_NONE, dip, EIB_PROP_GW_VENDOR_ID,
        (char *)(gwi->gw_vendor_id));
    if (ret != DDI_PROP_SUCCESS) {
        ENX_DPRINTF_WARN("ndi_prop_update_string() failed to set "
            "%s property to '%s' for child dip 0x%llx, ret=%d",
            EIB_PROP_GW_VENDOR_ID, gwi->gw_vendor_id, dip, ret);
    }
}

int
eibnx_name_child(dev_info_t *child, char *name, size_t namesz)
{
    char *node_name;

    if ((node_name = ddi_get_parent_data(child)) == NULL) {
        ENX_DPRINTF_ERR("ddi_get_parent_data(child=0x%llx) "
            "returned NULL", child);
        return (DDI_NOT_WELL_FORMED);
    }

    /*
     * Skip the name and "@" part in the eoib node path and copy the
     * address part out to the caller.
     */
    (void) strlcpy(name, node_name + strlen(EIB_DRV_NAME) + 1, namesz);

    return (DDI_SUCCESS);
}

/*
 * Synchronization functions to mark/clear the in-progress status of
 * bus config/unconfig operations
 */

void
eibnx_busop_inprog_enter(eibnx_t *ss)
{
    mutex_enter(&ss->nx_busop_lock);

    while (ss->nx_busop_flags & NX_FL_BUSOP_INPROG)
        cv_wait(&ss->nx_busop_cv, &ss->nx_busop_lock);

    ss->nx_busop_flags |= NX_FL_BUSOP_INPROG;

    mutex_exit(&ss->nx_busop_lock);
}

void
eibnx_busop_inprog_exit(eibnx_t *ss)
{
    mutex_enter(&ss->nx_busop_lock);

    ss->nx_busop_flags &= (~NX_FL_BUSOP_INPROG);

    cv_broadcast(&ss->nx_busop_cv);
    mutex_exit(&ss->nx_busop_lock);
}

eibnx_thr_info_t *
eibnx_start_port_monitor(eibnx_hca_t *hca, eibnx_port_t *port)
{
    eibnx_thr_info_t *ti;
    kthread_t *kt;
    dev_info_t *hca_dip;
    const char *hca_drv_name;
    int hca_drv_inst;

    ti = kmem_zalloc(sizeof (eibnx_thr_info_t), KM_SLEEP);

    mutex_init(&ti->ti_mcg_lock, NULL, MUTEX_DRIVER, NULL);
    mutex_init(&ti->ti_gw_lock, NULL, MUTEX_DRIVER, NULL);
    mutex_init(&ti->ti_child_lock, NULL, MUTEX_DRIVER, NULL);
    mutex_init(&ti->ti_event_lock, NULL, MUTEX_DRIVER, NULL);
    cv_init(&ti->ti_event_cv, NULL, CV_DEFAULT, NULL);

    ti->ti_next = NULL;
    ti->ti_hca_guid = hca->hc_guid;
    ti->ti_hca = hca->hc_hdl;
    ti->ti_pd = hca->hc_pd;
    ti->ti_pi = port->po_pi;
    ti->ti_ident = kmem_zalloc(MAXNAMELEN, KM_SLEEP);

    /*
     * Prepare the "ident" for EoIB nodes from this port monitor.  To
     * associate eoib instances with the corresponding HCA nodes easily,
     * and to make sure eoib instance numbers do not change when
     * like-for-like HCA replacements are made, tie up the ident to
     * HCA driver name, HCA driver instance and the HCA port number.
     * The eoib node address is later composed using this ident and
     * the gateway port ids after discovery.
     */
    if ((hca_dip = ibtl_ibnex_hcaguid2dip(ti->ti_hca_guid)) == NULL) {
        ENX_DPRINTF_WARN("ibtl_ibnex_hcaguid2dip(hca_guid=0x%llx) "
            "returned NULL", ti->ti_hca_guid);
    } else if ((hca_drv_name = ddi_driver_name(hca_dip)) == NULL) {
        ENX_DPRINTF_WARN("hca driver name NULL for "
            "hca_guid=0x%llx, hca_dip=0x%llx",
            ti->ti_hca_guid, hca_dip);
    } else if ((hca_drv_inst = ddi_get_instance(hca_dip)) < 0) {
        ENX_DPRINTF_ERR("hca driver instance (%d) invalid for "
            "hca_guid=0x%llx, hca_dip=0x%llx",
            ti->ti_hca_guid, hca_dip);
    } else {
        (void) snprintf(ti->ti_ident, MAXNAMELEN, "%s%d,%x",
            hca_drv_name, hca_drv_inst, ti->ti_pi->p_port_num);
    }

    kt = thread_create(NULL, 0, eibnx_port_monitor,
        ti, 0, &p0, TS_RUN, minclsyspri);

    ti->ti_kt_did = kt->t_did;

    return (ti);
}

void
eibnx_stop_port_monitor(eibnx_thr_info_t *ti)
{
    /*
     * Tell the port monitor thread to stop and wait for it to
     * happen.  Before marking it for death, make sure there
     * aren't any completions being processed.
     */
    mutex_enter(&ti->ti_event_lock);
    while (ti->ti_event & ENX_EVENT_COMPLETION) {
        cv_wait(&ti->ti_event_cv, &ti->ti_event_lock);
    }
    ti->ti_event |= ENX_EVENT_DIE;
    cv_broadcast(&ti->ti_event_cv);
    mutex_exit(&ti->ti_event_lock);

    thread_join(ti->ti_kt_did);

    /*
     * Destroy synchronization primitives initialized for this ti
     */
    cv_destroy(&ti->ti_event_cv);
    mutex_destroy(&ti->ti_event_lock);
    mutex_destroy(&ti->ti_child_lock);
    mutex_destroy(&ti->ti_gw_lock);
    mutex_destroy(&ti->ti_mcg_lock);

    kmem_free(ti->ti_ident, MAXNAMELEN);
    kmem_free(ti, sizeof (eibnx_thr_info_t));
}

void
eibnx_terminate_monitors(void)
{
    eibnx_t *ss = enx_global_ss;
    eibnx_thr_info_t *ti_list;
    eibnx_thr_info_t *ti;
    eibnx_thr_info_t *ti_next;

    mutex_enter(&ss->nx_lock);
    ti_list = ss->nx_thr_info;
    ss->nx_thr_info = NULL;
    mutex_exit(&ss->nx_lock);

    /*
     * Ask all the port_monitor threads to die. Before marking them
     * for death, make sure there aren't any completions being
     * processed by the thread.
     */
    for (ti = ti_list; ti; ti = ti_next) {
        ti_next = ti->ti_next;
        eibnx_stop_port_monitor(ti);
    }

    mutex_enter(&ss->nx_lock);
    ss->nx_monitors_up = B_FALSE;
    mutex_exit(&ss->nx_lock);
}

int
eibnx_configure_node(eibnx_thr_info_t *ti, eibnx_gw_info_t *gwi,
    dev_info_t **childp)
{
    eibnx_t *ss = enx_global_ss;
    dev_info_t *child_dip;
    char *node_name;
    int circular;
    int ret;

    /*
     * Prepare the new node's name
     */
    if ((node_name = eibnx_make_nodename(ti, gwi->gw_portid)) == NULL)
        return (ENX_E_FAILURE);

    ndi_devi_enter(ss->nx_dip, &circular);

    if (child_dip = ndi_devi_findchild(ss->nx_dip, node_name)) {
        ret = eibnx_update_child(ti, gwi, child_dip);
        if (ret == ENX_E_SUCCESS) {
            ndi_devi_exit(ss->nx_dip, circular);
            kmem_free(node_name, MAXNAMELEN);

            if (childp) {
                *childp = child_dip;
            }
            return (ENX_E_SUCCESS);
        }
    }

    /*
     * If the node does not already exist, we may need to create it
     */
    if (child_dip == NULL) {
        ndi_devi_alloc_sleep(ss->nx_dip, EIB_DRV_NAME,
            (pnode_t)DEVI_SID_NODEID, &child_dip);

        ddi_set_parent_data(child_dip, node_name);
        eibnx_create_node_props(child_dip, ti, gwi);
    }

    /*
     * Whether there was no devinfo node at all for the given node name or
     * we had a devinfo node, but it wasn't in our list of eoib children,
     * we'll try to online the instance here.
     */
    ENX_DPRINTF_DEBUG("onlining %s", node_name);
    ret = ndi_devi_online(child_dip, 0);
    if (ret != NDI_SUCCESS) {
        ENX_DPRINTF_ERR("ndi_devi_online(node_name=%s) failed "
            "with ret=0x%x", node_name, ret);

        ddi_set_parent_data(child_dip, NULL);
        (void) ndi_devi_free(child_dip);

        ndi_devi_exit(ss->nx_dip, circular);
        kmem_free(node_name, MAXNAMELEN);

        return (ENX_E_FAILURE);
    }

    eibnx_enqueue_child(ti, gwi, node_name, child_dip);

    ndi_devi_exit(ss->nx_dip, circular);

    if (childp) {
        *childp = child_dip;
    }

    return (ENX_E_SUCCESS);
}

int
eibnx_unconfigure_node(eibnx_thr_info_t *ti, eibnx_gw_info_t *gwi)
{
    /*
     * To unconfigure an eoib node, we only need to set the child's
     * dip to NULL.  When the node gets configured again, we either
     * find the dip for the pathname and set it in this child, or
     * allocate a new dip and set it in this child.
     */
    return (eibnx_update_child(ti, gwi, NULL));
}

int
eibnx_locate_node_name(char *devname, eibnx_thr_info_t **ti_p,
    eibnx_gw_info_t **gwi_p)
{
    eibnx_t *ss = enx_global_ss;
    eibnx_thr_info_t *ti;
    eibnx_gw_info_t *gwi;
    char name[MAXNAMELEN];

    /*
     * Locate the port monitor thread info and gateway info
     * that corresponds to the supplied devname.
     */
    mutex_enter(&ss->nx_lock);
    for (ti = ss->nx_thr_info; ti; ti = ti->ti_next) {
        if (ti->ti_ident[0] == '\0')
            continue;

        mutex_enter(&ti->ti_gw_lock);
        for (gwi = ti->ti_gw; gwi; gwi = gwi->gw_next) {
            (void) snprintf(name, MAXNAMELEN,
                "%s@%s,%x", EIB_DRV_NAME, ti->ti_ident,
                gwi->gw_portid);

            if (strcmp(name, devname) == 0)
                break;
        }
        mutex_exit(&ti->ti_gw_lock);

        if (gwi) {
            break;
        }
    }
    mutex_exit(&ss->nx_lock);

    if (ti == NULL || gwi == NULL) {
        return (ENX_E_FAILURE);
    }

    *ti_p = ti;
    *gwi_p = gwi;

    return (ENX_E_SUCCESS);
}

int
eibnx_locate_unconfigured_node(eibnx_thr_info_t **ti_p, eibnx_gw_info_t **gwi_p)
{
    eibnx_t *ss = enx_global_ss;
    eibnx_thr_info_t *ti;
    eibnx_child_t *ch;

    mutex_enter(&ss->nx_lock);
    for (ti = ss->nx_thr_info; ti; ti = ti->ti_next) {
        mutex_enter(&ti->ti_child_lock);
        for (ch = ti->ti_child; ch; ch = ch->ch_next) {
            if (ch->ch_dip == NULL) {
                *ti_p = ti;
                *gwi_p = ch->ch_gwi;

                mutex_exit(&ti->ti_child_lock);
                mutex_exit(&ss->nx_lock);

                return (ENX_E_SUCCESS);
            }
        }
        mutex_exit(&ti->ti_child_lock);
    }
    mutex_exit(&ss->nx_lock);

    return (ENX_E_FAILURE);
}

static char *
eibnx_make_nodename(eibnx_thr_info_t *info, uint16_t gw_portid)
{
    char *name;

    if (info->ti_ident[0] == NULL)
        return (NULL);

    name = kmem_zalloc(MAXNAMELEN, KM_SLEEP);
    (void) snprintf(name, MAXNAMELEN, "%s@%s,%x", EIB_DRV_NAME,
        info->ti_ident, gw_portid);

    return (name);
}