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/*
* Copyright © 2009 CNRS
* Copyright © 2009-2016 Inria. All rights reserved.
* Copyright © 2009-2010 Université Bordeaux
* Copyright © 2009-2011 Cisco Systems, Inc. All rights reserved.
* See COPYING in top-level directory.
*/
/** \file
* \brief Macros to help interaction between hwloc and OpenFabrics
* verbs.
*
* Applications that use both hwloc and OpenFabrics verbs may want to
* include this file so as to get topology information for OpenFabrics
* hardware (InfiniBand, etc).
*
*/
#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
/** \defgroup hwlocality_openfabrics Interoperability with OpenFabrics
*
* This interface offers ways to retrieve topology information about
* OpenFabrics devices (InfiniBand, Omni-Path, usNIC, etc).
*
* @{
*/
/** \brief Get the CPU set of logical processors that are physically
* close to device \p ibdev.
*
* Return the CPU set describing the locality of the OpenFabrics
* device \p ibdev (InfiniBand, etc).
*
* Topology \p topology and device \p ibdev must match the local machine.
* I/O devices detection is not needed in the topology.
*
* The function only returns the locality of the device.
* If more information about the device is needed, OS objects should
* be used instead, see hwloc_ibv_get_device_osdev()
* and hwloc_ibv_get_device_osdev_by_name().
*
* This function is currently only implemented in a meaningful way for
* Linux; other systems will simply get a full cpuset.
*/
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;
if (hwloc_linux_parse_cpumap_file(sysfile, set) < 0
|| 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;
}
/** \brief Get the hwloc OS device object corresponding to the OpenFabrics
* device named \p ibname.
*
* Return the OS device object describing the OpenFabrics device
* (InfiniBand, Omni-Path, usNIC, etc) whose name is \p ibname
* (mlx5_0, hfi1_0, usnic_0, qib0, etc).
* Returns NULL if there is none.
* The name \p ibname is usually obtained from ibv_get_device_name().
*
* The topology \p topology does not necessarily have to match the current
* machine. For instance the topology may be an XML import of a remote host.
* I/O devices detection must be enabled in the topology.
*
* \note The corresponding PCI device object can be obtained by looking
* at the OS device parent object.
*/
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;
}
/** \brief Get the hwloc OS device object corresponding to the OpenFabrics
* device \p ibdev.
*
* Return the OS device object describing the OpenFabrics device \p ibdev
* (InfiniBand, etc). Returns NULL if there is none.
*
* Topology \p topology and device \p ibdev must match the local machine.
* I/O devices detection must be enabled in the topology.
* If not, the locality of the object may still be found using
* hwloc_ibv_get_device_cpuset().
*
* \note The corresponding PCI device object can be obtained by looking
* at the OS device parent object.
*/
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 */
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