openfabrics-verbs.h

/*
 * Copyright © 2009 CNRS
 * Copyright © 2009-2013 Inria.  All rights reserved.
 * Copyright © 2009-2010 Université Bordeaux 1
 * Copyright © 2009-2011 Cisco Systems, Inc.  All rights reserved.
 * See COPYING in top-level directory.
 */

#ifndef HWLOC_OPENFABRICS_VERBS_H
#define HWLOC_OPENFABRICS_VERBS_H

#include <hwloc.h>
#include <hwloc/autogen/config.h>
#ifdef HWLOC_LINUX_SYS
#include <hwloc/linux.h>
#endif

#include <infiniband/verbs.h>


#ifdef __cplusplus
extern "C" {
#endif


static __hwloc_inline int
hwloc_ibv_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
                            struct ibv_device *ibdev, hwloc_cpuset_t set)
{
#ifdef HWLOC_LINUX_SYS
  /* If we're on Linux, use the verbs-provided sysfs mechanism to
     get the local cpus */
#define HWLOC_OPENFABRICS_VERBS_SYSFS_PATH_MAX 128
  char path[HWLOC_OPENFABRICS_VERBS_SYSFS_PATH_MAX];
  FILE *sysfile = NULL;

  if (!hwloc_topology_is_thissystem(topology)) {
    errno = EINVAL;
    return -1;
  }

  sprintf(path, "/sys/class/infiniband/%s/device/local_cpus",
          ibv_get_device_name(ibdev));
  sysfile = fopen(path, "r");
  if (!sysfile)
    return -1;

  hwloc_linux_parse_cpumap_file(sysfile, set);
  if (hwloc_bitmap_iszero(set))
    hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));

  fclose(sysfile);
#else
  /* Non-Linux systems simply get a full cpuset */
  hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
#endif
  return 0;
}

static __hwloc_inline hwloc_obj_t
hwloc_ibv_get_device_osdev_by_name(hwloc_topology_t topology,
                                   const char *ibname)
{
        hwloc_obj_t osdev = NULL;
        while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
                if (HWLOC_OBJ_OSDEV_OPENFABRICS == osdev->attr->osdev.type
                    && osdev->name && !strcmp(ibname, osdev->name))
                        return osdev;
        }
        return NULL;
}

static __hwloc_inline hwloc_obj_t
hwloc_ibv_get_device_osdev(hwloc_topology_t topology,
                           struct ibv_device *ibdev)
{
        if (!hwloc_topology_is_thissystem(topology)) {
                errno = EINVAL;
                return NULL;
        }
        return hwloc_ibv_get_device_osdev_by_name(topology, ibv_get_device_name(ibdev));
}

#ifdef __cplusplus
} /* extern "C" */
#endif


#endif /* HWLOC_OPENFABRICS_VERBS_H */