/*
 * 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) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
 */

#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 <strings.h>
#include <fcntl.h>
#include <libdladm.h>
#include <libdlib.h>
#include <libdllink.h>
#include <sys/ib/ibnex/ibnex_devctl.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 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(char *dev_path, int *hca_idx,
    int try_blueflame);
static DAT_RETURN dapli_process_ia(dladm_ib_attr_t *ib_attr, 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;
DAPL_OS_LOCK dapls_ib_dbp_lock;

DAT_RETURN
dapli_init_hca(
        IN   DAPL_HCA                   *hca_ptr)
{
        DAT_RETURN              dat_status = DAT_SUCCESS;
        int                     hca_idx = 0;
        int                     check_for_bf = 0;
        datalink_class_t        class;
        datalink_id_t           linkid;
        dladm_ib_attr_t         ib_attr;
        ibnex_ctl_query_hca_t   query_hca;
        int                     ibnex_fd = -1;
        dladm_handle_t          dlh;
        char                    hca_device_path[MAXPATHLEN];

        if (dladm_open(&dlh) != DLADM_STATUS_OK) {
                dapl_dbg_log(DAPL_DBG_TYPE_ERR,
                    "init_hca: dladm_open failed\n");
                return (DAT_INTERNAL_ERROR);
        }

        if ((ibnex_fd = open(IBNEX_DEVCTL_DEV, O_RDONLY)) < 0) {
                dat_status = DAT_ERROR(DAT_NAME_NOT_FOUND, 0);
                dapl_dbg_log(DAPL_DBG_TYPE_UTIL,
                    "init_hca: could not open ib nexus (%s)\n",
                    strerror(errno));
                goto bail;
        }

        if ((dladm_name2info(dlh, hca_ptr->name, &linkid, NULL, &class,
            NULL) != DLADM_STATUS_OK) ||
            (class != DATALINK_CLASS_PART) ||
            (dladm_part_info(dlh, linkid, &ib_attr,
            DLADM_OPT_ACTIVE) != DLADM_STATUS_OK)) {
                dat_status = DAT_ERROR(DAT_NAME_NOT_FOUND, 0);
                dapl_dbg_log(DAPL_DBG_TYPE_UTIL,
                    "init_hca: %s not found - couldn't get partition info\n",
                    hca_ptr->name);
                goto bail;
        }

        bzero(&query_hca, sizeof (query_hca));
        query_hca.hca_guid = ib_attr.dia_hca_guid;
        query_hca.hca_device_path = hca_device_path;
        query_hca.hca_device_path_alloc_sz = sizeof (hca_device_path);
        if (ioctl(ibnex_fd, IBNEX_CTL_QUERY_HCA, &query_hca) == -1) {
                dat_status = DAT_ERROR(DAT_NAME_NOT_FOUND, 0);
                dapl_dbg_log(DAPL_DBG_TYPE_UTIL,
                    "init_hca: %s not found; query_hca failed\n",
                    hca_ptr->name);
                goto bail;
        }

        if (strcmp(query_hca.hca_info.hca_driver_name, "tavor") == 0)
                dapls_init_funcs_tavor(hca_ptr);
        else if (strcmp(query_hca.hca_info.hca_driver_name, "arbel") == 0)
                dapls_init_funcs_arbel(hca_ptr);
        else if (strcmp(query_hca.hca_info.hca_driver_name, "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_hca: %s not found\n", hca_ptr->name);
                goto bail;
        }

        dat_status = dapli_process_tavor_node(hca_device_path, &hca_idx,
            check_for_bf);
        if (dat_status != DAT_SUCCESS) {
                dapl_dbg_log(DAPL_DBG_TYPE_UTIL,
                    "init_hcas: %s process_tavor_node failed(0x%x)\n",
                    hca_ptr->name, 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_ia(&ib_attr, hca_ptr, hca_idx);
#endif
        if (dat_status != DAT_SUCCESS) {
                dapl_dbg_log(DAPL_DBG_TYPE_UTIL,
                    "init_hcas: %s process_ia failed(0x%x)\n",
                    hca_ptr->name, dat_status);
                goto bail;
        }

        dapl_dbg_log(DAPL_DBG_TYPE_UTIL,
            "init_hcas: done %s\n", hca_ptr->name);

bail:
        if (ibnex_fd != -1)
                (void) close(ibnex_fd);
        dladm_close(dlh);
        return (dat_status);
}

static DAT_RETURN
dapli_process_tavor_node(char *dev_path, int *hca_idx, int try_blueflame)
{
        char            path_buf[MAXPATHLEN];
        int             i, 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));
        }

        for (i = 0; i < idx; i++) {
                if (strcmp(dev_path, g_tavor_state[i].hca_path) == 0) {
                        /* no need for a refcnt */
                        idx = i;
                        goto done;
                }
        }

        /* 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);
                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");
        (void) dapl_os_strcpy(g_tavor_state[idx].hca_path, 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;
                g_tavor_state[idx].bf_toggle = 0;
        }
done:
        dapl_os_unlock(&g_tavor_state_lock);

        *hca_idx = idx;

        return (DAT_SUCCESS);
}

static DAT_RETURN
dapli_process_ia(dladm_ib_attr_t *ib_attr, DAPL_HCA *hca_ptr, int hca_idx)
{
        struct lifreq   lifreq;
        int             sfd, retval, af;
        char            addr_buf[64];

        if (ib_attr->dia_hca_guid == 0 || ib_attr->dia_portnum == 0 ||
            ib_attr->dia_pkey == 0) {
                dapl_dbg_log(DAPL_DBG_TYPE_ERR,
                    "process_ia: invalid properties: guid 0x%016llx, "
                    "port %d, pkey 0x%08x\n", ib_attr->dia_hca_guid,
                    ib_attr->dia_portnum, (uint_t)ib_attr->dia_pkey);
                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_ia: socket failed: %s\n", strerror(errno));
                return (DAT_ERROR(DAT_INSUFFICIENT_RESOURCES, 0));
        }

        /* check if name will fit in lifr_name */
        if (dapl_os_strlen(hca_ptr->name) >= LIFNAMSIZ) {
                (void) close(sfd);
                dapl_dbg_log(DAPL_DBG_TYPE_ERR,
                    "process_ia: if name overflow %s\n",
                    hca_ptr->name);
                return (DAT_ERROR(DAT_INVALID_PARAMETER, 0));
        }

        (void) dapl_os_strcpy(lifreq.lifr_name, hca_ptr->name);
        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_ia: %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->tavor_idx = hca_idx;
        hca_ptr->node_GUID = ib_attr->dia_hca_guid;
        hca_ptr->port_num = ib_attr->dia_portnum;
        hca_ptr->partition_key = ib_attr->dia_pkey;
        (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_ia: interface %s, hca guid 0x%016llx, port %d, "
            "pkey 0x%08x, ip addr %s\n", lifreq.lifr_name, hca_ptr->node_GUID,
            hca_ptr->port_num, hca_ptr->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 = &g_tavor_state[hca_ptr->tavor_idx].bf_toggle;
        *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->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 */