udapl_tavor/tavor/dapl_tavor_hca.c

	dapl_tavor_hca.c revision 9e39c5ba00a55fa05777cc94b148296af305e135
/*
 * 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 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <libdevinfo.h>

#include "dapl.h"
#include "dapl_adapter_util.h"
#include "dapl_tavor_ibtf_impl.h"
#include "dapl_hca_util.h"
#include "dapl_name_service.h"
#define IF_NAME         "ibd"
#define MAX_HCAS        64
#define PROP_HCA_GUID       "hca-guid"
#define PROP_PORT_NUM       "port-number"
#define PROP_PORT_PKEY      "port-pkey"

#define DEVDAPLT        "/dev/daplt"

/* function prototypes */
static DAT_RETURN dapli_process_tavor_node(di_node_t node, int *hca_idx,
    int try_blueflame);
static DAT_RETURN dapli_process_ibd_node(di_node_t node, DAPL_HCA *hca_ptr,
    int hca_idx);

#if defined(IBHOSTS_NAMING)
#include <stdio.h>
static int dapli_process_fake_ibds(DAPL_HCA **hca_list, int hca_idx);
#endif /* IBHOSTS_NAMING */

static DAPL_OS_LOCK g_tavor_state_lock;
static struct dapls_ib_hca_state g_tavor_state[MAX_HCAS];
DAPL_OS_LOCK g_tavor_uar_lock;

DAT_RETURN
dapli_init_hca(
    IN   DAPL_HCA           *hca_ptr)
{
    di_node_t   root_node;
    di_node_t   hca_node;
    di_node_t   ibd_node;
    DAT_RETURN  dat_status = DAT_SUCCESS;
    int     hca_idx = 0;
    int     ia_instance;
    int     check_for_bf = 0;

    ia_instance = (int)dapl_os_strtol(hca_ptr->name + strlen(IF_NAME),
        NULL, 0);

    root_node = di_init("/", DINFOCPYALL);
    if (root_node == DI_NODE_NIL) {
        dapl_dbg_log(DAPL_DBG_TYPE_ERR,
            "init_hca: di_init failed %s\n", strerror(errno));
        return (DAT_INTERNAL_ERROR);
    }

    ibd_node = di_drv_first_node(IF_NAME, root_node);
    while (ibd_node != DI_NODE_NIL) {
        /* find the ibd node matching our ianame */
        if (di_instance(ibd_node) == ia_instance) {
            break;
        }
        ibd_node = di_drv_next_node(ibd_node);
    }

    if (ibd_node == DI_NODE_NIL) {
        dat_status = DAT_ERROR(DAT_NAME_NOT_FOUND, 0);
        dapl_dbg_log(DAPL_DBG_TYPE_ERR,
            "init_hcas: ibd%d di_node not found\n", ia_instance);
        goto bail;
    }

    hca_node = di_parent_node(ibd_node);
    if ((hca_node != DI_NODE_NIL) && (strncmp(di_driver_name(hca_node),
        "tavor", strlen("tavor")) == 0))
        dapls_init_funcs_tavor(hca_ptr);
    else if ((hca_node != DI_NODE_NIL) && (strncmp(di_driver_name
        (hca_node), "arbel", strlen("arbel")) == 0))
        dapls_init_funcs_arbel(hca_ptr);
    else if ((hca_node != DI_NODE_NIL) && (strncmp(di_driver_name
        (hca_node), "hermon", strlen("hermon")) == 0)) {
        dapls_init_funcs_hermon(hca_ptr);
        check_for_bf = 1;
    } else {
        dat_status = DAT_ERROR(DAT_NAME_NOT_FOUND, 0);
        dapl_dbg_log(DAPL_DBG_TYPE_UTIL,
            "init_hcas: ibd%d hca_node not found\n", ia_instance);
        goto bail;
    }

    dat_status = dapli_process_tavor_node(hca_node, &hca_idx, check_for_bf);
    if (dat_status != DAT_SUCCESS) {
        dapl_dbg_log(DAPL_DBG_TYPE_UTIL,
            "init_hcas: ibd%d process_tavor_node failed(0x%x)\n",
            ia_instance, dat_status);
        goto bail;
    }

#if defined(IBHOSTS_NAMING)
    if (dapli_process_fake_ibds(hca_ptr, hca_idx) == 0) {
        /* no entries were found */
        dat_status = DAT_ERROR(DAT_NAME_NOT_FOUND, 0);
    }
#else
    dat_status = dapli_process_ibd_node(ibd_node, hca_ptr, hca_idx);
#endif
    if (dat_status != DAT_SUCCESS) {
        dapl_dbg_log(DAPL_DBG_TYPE_UTIL,
            "init_hcas: ibd%d process_ibd_node failed(0x%x)\n",
            ia_instance, dat_status);
        goto bail;
    }

    dapl_dbg_log(DAPL_DBG_TYPE_UTIL,
        "init_hcas: done ibd%d\n", ia_instance);

bail:
    di_fini(root_node);
    return (dat_status);
}

static DAT_RETURN
dapli_process_tavor_node(di_node_t node, int *hca_idx, int try_blueflame)
{
    char        *dev_path;
    char        path_buf[MAXPATHLEN];
    int     idx, fd;
#ifndef _LP64
    int     tmpfd;
#endif
    size_t      pagesize;
    void        *mapaddr;
    pid_t       cur_pid;
    off64_t     uarpg_offset;

    dapl_os_lock(&g_tavor_state_lock);

    for (idx = 0; idx < MAX_HCAS; idx++) {
        /*
         * page size == 0 means this entry is not occupied
         */
        if (g_tavor_state[idx].uarpg_size == 0) {
            break;
        }
    }
    if (idx == MAX_HCAS) {
        dapl_dbg_log(DAPL_DBG_TYPE_ERR,
            "process_tavor: all hcas are being used!\n");
        dapl_os_unlock(&g_tavor_state_lock);
        return (DAT_ERROR(DAT_INSUFFICIENT_RESOURCES, 0));
    }
    dev_path = di_devfs_path(node);

    /* Add 16 to accomodate the prefix "/devices" and suffix ":devctl" */
    if (strlen("/devices") + strlen(dev_path) + strlen(":devctl") + 1 >
        MAXPATHLEN) {
        dapl_dbg_log(DAPL_DBG_TYPE_ERR,
            "process_tavor: devfs path %s is too long\n",
            dev_path);
        di_devfs_path_free(dev_path);
        dapl_os_unlock(&g_tavor_state_lock);
        return (DAT_ERROR(DAT_INTERNAL_ERROR, 0));
    }
    (void) dapl_os_strcpy(path_buf, "/devices");
    (void) dapl_os_strcat(path_buf, dev_path);
    (void) dapl_os_strcat(path_buf, ":devctl");
    di_devfs_path_free(dev_path);

    pagesize = (size_t)sysconf(_SC_PAGESIZE);
    if (pagesize == 0) {
        dapl_dbg_log(DAPL_DBG_TYPE_ERR,
            "process_tavor: page_size == 0\n");
        dapl_os_unlock(&g_tavor_state_lock);
        return (DAT_ERROR(DAT_INTERNAL_ERROR, 0));
    }
    cur_pid = getpid();

    fd = open(path_buf, O_RDWR);
    if (fd < 0) {
        dapl_dbg_log(DAPL_DBG_TYPE_ERR,
            "process_tavor: cannot open %s: %s\n",
            path_buf, strerror(errno));
        dapl_os_unlock(&g_tavor_state_lock);
        return (DAT_ERROR(DAT_INSUFFICIENT_RESOURCES, 0));
    }
#ifndef _LP64
    /*
     * libc can't handle fd's greater than 255,  in order to
     * ensure that these values remain available make fd > 255.
     * Note: not needed for LP64
     */
    tmpfd = fcntl(fd, F_DUPFD, 256);
    if (tmpfd < 0) {
        dapl_dbg_log(DAPL_DBG_TYPE_UTIL,
        "process_tavor: cannot F_DUPFD: %s\n", strerror(errno));
    } else {
        (void) close(fd);
        fd = tmpfd;
    }
#endif  /* _LP64 */

    if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0) {
        dapl_dbg_log(DAPL_DBG_TYPE_ERR,
            "process_tavor: cannot F_SETFD: %s\n", strerror(errno));
        (void) close(fd);
        dapl_os_unlock(&g_tavor_state_lock);
        return (DAT_ERROR(DAT_INTERNAL_ERROR, 0));
    }

    uarpg_offset = (((off64_t)cur_pid << MLNX_UMAP_RSRC_TYPE_SHIFT) |
        MLNX_UMAP_UARPG_RSRC) * pagesize;

    mapaddr = mmap64((void  *)0, pagesize, PROT_READ | PROT_WRITE,
        MAP_SHARED, fd, uarpg_offset);
    if (mapaddr == MAP_FAILED) {
        dapl_dbg_log(DAPL_DBG_TYPE_ERR,
            "process_tavor: mmap failed %s\n", strerror(errno));
        (void) close(fd);
        dapl_os_unlock(&g_tavor_state_lock);
        return (DAT_ERROR(DAT_INSUFFICIENT_RESOURCES, 0));
    }

    g_tavor_state[idx].hca_fd = fd;
    g_tavor_state[idx].uarpg_baseaddr = mapaddr;
    g_tavor_state[idx].uarpg_size = pagesize;

    if (try_blueflame == 0)
        goto done;

    /* Try to do the Hermon Blueflame page mapping */
    uarpg_offset = (((off64_t)cur_pid << MLNX_UMAP_RSRC_TYPE_SHIFT) |
        MLNX_UMAP_BLUEFLAMEPG_RSRC) * pagesize;

    mapaddr = mmap64((void  *)0, pagesize, PROT_READ | PROT_WRITE,
        MAP_SHARED, fd, uarpg_offset);
    if (mapaddr == MAP_FAILED) {
        /* This is not considered to be fatal.  Charge on! */
        dapl_dbg_log(DAPL_DBG_TYPE_WARN,
            "process_tavor: mmap of blueflame page failed %s\n",
            strerror(errno));
    } else {
        g_tavor_state[idx].bf_pg_baseaddr = mapaddr;
    }
done:
    dapl_os_unlock(&g_tavor_state_lock);

    *hca_idx = idx;

    return (DAT_SUCCESS);
}

static DAT_RETURN
dapli_process_ibd_node(di_node_t node, DAPL_HCA *hca_ptr, int hca_idx)
{
    di_prop_t   prop;
    ib_guid_t   hca_guid = 0;
    struct lifreq   lifreq;
    uint32_t    port_num = 0;
    uint32_t    partition_key = 0;
    int     instance, sfd, retval, af;
    int     tmp;
    int     digits;
    char        *drv_name;
    char        addr_buf[64];

    prop = di_prop_next(node, DI_PROP_NIL);
    while (prop != DI_PROP_NIL) {
        char        *prop_name;
        uchar_t     *bytep;
        int     *intp, count;

        prop_name = di_prop_name(prop);
        count = 0;

        if (strcmp(prop_name, PROP_HCA_GUID) == 0) {
            count = di_prop_bytes(prop, &bytep);
            dapl_os_assert(count == sizeof (ib_guid_t));
            (void) dapl_os_memcpy((void *)&hca_guid, (void *)bytep,
                sizeof (ib_guid_t));
        } else if (strcmp(prop_name, PROP_PORT_NUM) == 0) {
            count = di_prop_ints(prop, &intp);
            dapl_os_assert(count == 1);
            port_num = (uint32_t)intp[0];
        } else if (strcmp(prop_name, PROP_PORT_PKEY) == 0) {
            count = di_prop_ints(prop, &intp);
            dapl_os_assert(count == 1);
            partition_key = (uint32_t)intp[0];
        }
        prop = di_prop_next(node, prop);
    }
    if (hca_guid == 0 || port_num == 0 || partition_key == 0) {
        dapl_dbg_log(DAPL_DBG_TYPE_ERR,
            "process_ibd: invalid properties: guid 0x%016llx, "
            "port %d, pkey 0x%08x\n", hca_guid, port_num,
            partition_key);
        return (DAT_ERROR(DAT_INVALID_PARAMETER, 0));
    }

    /*
     * if an interface has both v4 and v6 addresses plumbed,
     * we'll take the v4 address.
     */
    af = AF_INET;
again:
    sfd = socket(af, SOCK_DGRAM, 0);
    if (sfd < 0) {
        dapl_dbg_log(DAPL_DBG_TYPE_ERR,
            "process_ibd: socket failed: %s\n", strerror(errno));
        return (DAT_ERROR(DAT_INSUFFICIENT_RESOURCES, 0));
    }
    instance = di_instance(node);
    drv_name = di_driver_name(node);

    /* calculate the number of digits in instance */
    tmp = instance;
    digits = 0;
    do {
        tmp = tmp / 10;
        digits++;
    } while (tmp > 0);
    /* check if name will fit in lifr_name */
    if (dapl_os_strlen(drv_name) + digits +  1 > LIFNAMSIZ) {
        (void) close(sfd);
        dapl_dbg_log(DAPL_DBG_TYPE_ERR,
            "process_ibd: if name overflow %s:%d\n",
            drv_name, instance);
        return (DAT_ERROR(DAT_INVALID_PARAMETER, 0));
    }

    (void) dapl_os_strcpy(lifreq.lifr_name, drv_name);
    (void) sprintf(&lifreq.lifr_name[dapl_os_strlen(drv_name)], "%d",
        instance);
    retval = ioctl(sfd, SIOCGLIFADDR, (caddr_t)&lifreq);
    if (retval < 0) {
        (void) close(sfd);
        if (af == AF_INET6) {
            /*
             * the interface is not plumbed.
             */
            dapl_dbg_log(DAPL_DBG_TYPE_UTIL,
                "process_ibd: %s: ip address not found\n",
                lifreq.lifr_name);
            return (DAT_ERROR(DAT_INSUFFICIENT_RESOURCES, 0));
        } else {
            /*
             * we've failed to find a v4 address. now
             * let's try v6.
             */
            af = AF_INET6;
            goto again;
        }
    }
    (void) close(sfd);

    hca_ptr->hca_ibd_inst = instance;
    hca_ptr->tavor_idx = hca_idx;
    hca_ptr->node_GUID = hca_guid;
    hca_ptr->port_num = port_num;
    hca_ptr->partition_key = partition_key;
    (void) dapl_os_memcpy((void *)&hca_ptr->hca_address,
        (void *)&lifreq.lifr_addr, sizeof (hca_ptr->hca_address));
    hca_ptr->max_inline_send = dapls_tavor_max_inline();

    dapl_dbg_log(DAPL_DBG_TYPE_UTIL,
        "process_ibd: interface %s, hca guid 0x%016llx, port %d, "
        "pkey 0x%08x, ip addr %s\n", lifreq.lifr_name, hca_guid,
        port_num, partition_key, dapls_inet_ntop(
        (struct sockaddr *)&hca_ptr->hca_address, addr_buf, 64));
    return (DAT_SUCCESS);
}

void
dapls_ib_state_init(void)
{
    int i;

    (void) dapl_os_lock_init(&g_tavor_state_lock);
    (void) dapl_os_lock_init(&g_tavor_uar_lock);
    (void) dapl_os_lock_init(&dapls_ib_dbp_lock);

    for (i = 0; i < MAX_HCAS; i++) {
        g_tavor_state[i].hca_fd = 0;
        g_tavor_state[i].uarpg_baseaddr = NULL;
        g_tavor_state[i].uarpg_size = 0;
        g_tavor_state[i].bf_pg_baseaddr = NULL;
    }
}

void
dapls_ib_state_fini(void)
{
    int i, count = 0;

    /*
     * Uinitialize the per hca instance state
     */
    dapl_os_lock(&g_tavor_state_lock);
    for (i = 0; i < MAX_HCAS; i++) {
        if (g_tavor_state[i].uarpg_size == 0) {
            dapl_os_assert(g_tavor_state[i].uarpg_baseaddr ==
                NULL);
            continue;
        }
        if (munmap(g_tavor_state[i].uarpg_baseaddr,
            g_tavor_state[i].uarpg_size) < 0) {
            dapl_dbg_log(DAPL_DBG_TYPE_ERR,
                "ib_state_fini: "
                "munmap(0x%p, 0x%llx) failed(%d)\n",
                g_tavor_state[i].uarpg_baseaddr,
                g_tavor_state[i].uarpg_size, errno);
        }
        if ((g_tavor_state[i].bf_pg_baseaddr != NULL) &&
            (munmap(g_tavor_state[i].bf_pg_baseaddr,
            g_tavor_state[i].uarpg_size) < 0)) {
            dapl_dbg_log(DAPL_DBG_TYPE_ERR,
                "ib_state_fini: "
                "munmap(0x%p, 0x%llx) of blueflame failed(%d)\n",
                g_tavor_state[i].bf_pg_baseaddr,
                g_tavor_state[i].uarpg_size, errno);
        }

        (void) close(g_tavor_state[i].hca_fd);
        count++;
    }
    dapl_os_unlock(&g_tavor_state_lock);

    dapl_os_lock_destroy(&g_tavor_uar_lock);
    dapl_os_lock_destroy(&g_tavor_state_lock);
    dapl_os_lock_destroy(&dapls_ib_dbp_lock);

    dapl_dbg_log(DAPL_DBG_TYPE_UTIL,
        "ib_state_fini: cleaned %d hcas\n", count);
}

/*
 * dapls_ib_open_hca
 *
 * Open HCA
 *
 * Input:
 *      *hca_ptr          pointer to hca device
 *      *ib_hca_handle_p  pointer to provide HCA handle
 *
 * Output:
 *      none
 *
 * Return:
 *      DAT_SUCCESS
 *      DAT_INSUFFICIENT_RESOURCES
 *
 */
DAT_RETURN
dapls_ib_open_hca(
    IN DAPL_HCA     *hca_ptr,
    OUT ib_hca_handle_t *ib_hca_handle_p)
{
    dapl_ia_create_t        args;
    DAT_RETURN          dat_status;
    struct dapls_ib_hca_handle  *hca_p;
    int             fd;
#ifndef _LP64
    int             tmpfd;
#endif
    int             retval;
    struct sockaddr *s;
    struct sockaddr_in6 *v6addr;
    struct sockaddr_in *v4addr;
    dapl_ia_addr_t *sap;

    dat_status = dapli_init_hca(hca_ptr);
    if (dat_status != DAT_SUCCESS) {
        dapl_dbg_log(DAPL_DBG_TYPE_ERR,
            "dapls_ib_open_hca: init_hca failed %d\n", dat_status);
        return (dat_status);
    }

    fd = open(DEVDAPLT, O_RDONLY);
    if (fd < 0) {
        return (DAT_INSUFFICIENT_RESOURCES);
    }

#ifndef _LP64
    /*
     * libc can't handle fd's greater than 255,  in order to
     * ensure that these values remain available make fd > 255.
     * Note: not needed for LP64
     */
    tmpfd = fcntl(fd, F_DUPFD, 256);
    if (tmpfd < 0) {
        dapl_dbg_log(DAPL_DBG_TYPE_UTIL,
            "dapls_ib_open_hca: cannot F_DUPFD: %s\n",
            strerror(errno));
    } else {
        (void) close(fd);
        fd = tmpfd;
    }
#endif  /* _LP64 */

    if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0) {
        dapl_dbg_log(DAPL_DBG_TYPE_ERR,
            "dapls_ib_open_hca: cannot F_SETFD: %s\n", strerror(errno));
        (void) close(fd);
        return (DAT_INTERNAL_ERROR);
    }

    hca_p = (struct dapls_ib_hca_handle *)dapl_os_alloc(
        sizeof (struct dapls_ib_hca_handle));
    if (hca_p == NULL) {
        (void) close(fd);
        return (DAT_INSUFFICIENT_RESOURCES);
    }

    args.ia_guid = hca_ptr->node_GUID;
    args.ia_port = hca_ptr->port_num;
    args.ia_pkey = hca_ptr->partition_key;
    args.ia_version = DAPL_IF_VERSION;
    (void) dapl_os_memzero((void *)args.ia_sadata, DAPL_ATS_NBYTES);

    /* pass down local ip address to be stored in SA */
    s = (struct sockaddr *)&hca_ptr->hca_address;
    /* LINTED: E_BAD_PTR_CAST_ALIGN */
    sap = (dapl_ia_addr_t *)args.ia_sadata;
    switch (s->sa_family) {
    case AF_INET:
        /* LINTED: E_BAD_PTR_CAST_ALIGN */
        v4addr = (struct sockaddr_in *)s;
        sap->iad_v4 = v4addr->sin_addr;
        break;
    case AF_INET6:
        /* LINTED: E_BAD_PTR_CAST_ALIGN */
        v6addr = (struct sockaddr_in6 *)s;
        sap->iad_v6 = v6addr->sin6_addr;
        break;
    default:
        break; /* fall through */
    }

    retval = ioctl(fd, DAPL_IA_CREATE, &args);
    if (retval != 0) {
        dapl_dbg_log(DAPL_DBG_TYPE_ERR,
            "open_hca: ia_create failed, fd %d, "
            "guid 0x%016llx, port %d, pkey 0x%x, version %d\n",
            fd, args.ia_guid, args.ia_port, args.ia_pkey,
            args.ia_version);

        dapl_os_free(hca_p, sizeof (*hca_p));
        (void) close(fd);
        return (dapls_convert_error(errno, retval));
    }

    hca_p->ia_fd = fd;
    hca_p->ia_rnum = args.ia_resnum;
    hca_p->hca_fd = g_tavor_state[hca_ptr->tavor_idx].hca_fd;
    hca_p->ia_uar = g_tavor_state[hca_ptr->tavor_idx].uarpg_baseaddr;
    hca_p->ia_bf = g_tavor_state[hca_ptr->tavor_idx].bf_pg_baseaddr;
    hca_p->ia_bf_toggle = 0;
    *ib_hca_handle_p = hca_p;
    dapl_dbg_log(DAPL_DBG_TYPE_UTIL,
        "open_hca: ia_created, hca_p 0x%p, fd %d, "
        "rnum %d, guid 0x%016llx, port %d, pkey 0x%x\n",
        hca_p, hca_p->ia_fd, hca_p->ia_rnum, hca_ptr->node_GUID,
        hca_ptr->port_num, hca_ptr->partition_key);

    return (DAT_SUCCESS);
}

/*
 * dapls_ib_close_hca
 *
 * Open HCA
 *
 * Input:
 *      ib_hca_handle   provide HCA handle
 *
 * Output:
 *      none
 *
 * Return:
 *      DAT_SUCCESS
 *      DAT_INSUFFICIENT_RESOURCES
 *
 */
DAT_RETURN
dapls_ib_close_hca(
    IN ib_hca_handle_t  ib_hca_handle)
{
    if (ib_hca_handle == NULL) {
        dapl_dbg_log(DAPL_DBG_TYPE_ERR,
            "close_hca: ib_hca_handle == NULL\n");
        return (DAT_SUCCESS);
    }
    dapl_dbg_log(DAPL_DBG_TYPE_UTIL,
        "close_hca: closing hca 0x%p, fd %d, rnum %d\n",
        ib_hca_handle, ib_hca_handle->ia_fd, ib_hca_handle->ia_rnum);

    (void) close(ib_hca_handle->ia_fd);
    dapl_os_free((void *)ib_hca_handle,
        sizeof (struct dapls_ib_hca_handle));
    return (DAT_SUCCESS);
}

#if defined(IBHOSTS_NAMING)
#define LINE_LEN    256
static int
dapli_process_fake_ibds(DAPL_HCA *hca_ptr, int hca_idx)
{
    char        line_buf[LINE_LEN];
    char        host_buf[LINE_LEN];
    char        localhost[LINE_LEN];
    ib_guid_t   prefix;
    ib_guid_t   guid;
    FILE        *fp;
    int     count = 0;
    DAPL_HCA    *hca_ptr;

    fp = fopen("/etc/dapl/ibhosts", "r");
    if (fp == NULL) {
        dapl_dbg_log(DAPL_DBG_TYPE_ERR,
            "fake_ibds: ibhosts not found!\n");
        return (0);
    }
    if (gethostname(localhost, LINE_LEN) != 0) {
        dapl_dbg_log(DAPL_DBG_TYPE_ERR,
            "fake_ibds: hostname not found!\n");
        return (0);
    }
    while (!feof(fp)) {
        (void) fgets(line_buf, LINE_LEN, fp);
        sscanf(line_buf, "%s %llx %llx", host_buf, &prefix, &guid);
        (void) sprintf(line_buf, "%s-ib%d", localhost, count + 1);
        if (strncmp(line_buf, host_buf, strlen(line_buf)) == 0) {
            guid &= 0xfffffffffffffff0;
            hca_ptr->hca_ibd_inst = count + 1;
            hca_ptr->tavor_idx = hca_idx;
            hca_ptr->node_GUID = guid;
            hca_ptr->port_num = count + 1;
            hca_ptr->partition_key = 0x0000ffff;
            count++;
        }
        if (count >= 2) break;
    }
    (void) fclose(fp);
    return (count);
}

#endif /* IBHOSTS_NAMING */