Open MPI logo

Portable Hardware Locality (hwloc) Documentation: v2.7.0

  |   Home   |   Support   |   FAQ   |  
openfabrics-verbs.h
1 /*
2  * Copyright © 2009 CNRS
3  * Copyright © 2009-2021 Inria. All rights reserved.
4  * Copyright © 2009-2010 Université Bordeaux
5  * Copyright © 2009-2011 Cisco Systems, Inc. All rights reserved.
6  * See COPYING in top-level directory.
7  */
8 
19 #ifndef HWLOC_OPENFABRICS_VERBS_H
20 #define HWLOC_OPENFABRICS_VERBS_H
21 
22 #include "hwloc.h"
23 #include "hwloc/autogen/config.h"
24 #ifdef HWLOC_LINUX_SYS
25 #include "hwloc/linux.h"
26 #endif
27 
28 #include <infiniband/verbs.h>
29 
30 
31 #ifdef __cplusplus
32 extern "C" {
33 #endif
34 
35 
61 static __hwloc_inline int
62 hwloc_ibv_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
63  struct ibv_device *ibdev, hwloc_cpuset_t set)
64 {
65 #ifdef HWLOC_LINUX_SYS
66  /* If we're on Linux, use the verbs-provided sysfs mechanism to
67  get the local cpus */
68 #define HWLOC_OPENFABRICS_VERBS_SYSFS_PATH_MAX 128
69  char path[HWLOC_OPENFABRICS_VERBS_SYSFS_PATH_MAX];
70 
71  if (!hwloc_topology_is_thissystem(topology)) {
72  errno = EINVAL;
73  return -1;
74  }
75 
76  sprintf(path, "/sys/class/infiniband/%s/device/local_cpus",
77  ibv_get_device_name(ibdev));
78  if (hwloc_linux_read_path_as_cpumask(path, set) < 0
79  || hwloc_bitmap_iszero(set))
81 #else
82  /* Non-Linux systems simply get a full cpuset */
84 #endif
85  return 0;
86 }
87 
105 static __hwloc_inline hwloc_obj_t
107  const char *ibname)
108 {
109  hwloc_obj_t osdev = NULL;
110  while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
112  && osdev->name && !strcmp(ibname, osdev->name))
113  return osdev;
114  }
115  return NULL;
116 }
117 
133 static __hwloc_inline hwloc_obj_t
135  struct ibv_device *ibdev)
136 {
137  if (!hwloc_topology_is_thissystem(topology)) {
138  errno = EINVAL;
139  return NULL;
140  }
141  return hwloc_ibv_get_device_osdev_by_name(topology, ibv_get_device_name(ibdev));
142 }
143 
147 #ifdef __cplusplus
148 } /* extern "C" */
149 #endif
150 
151 
152 #endif /* HWLOC_OPENFABRICS_VERBS_H */
hwloc_bitmap_t hwloc_cpuset_t
A CPU set is a bitmap whose bits are set according to CPU physical OS indexes.
Definition: hwloc.h:140
@ HWLOC_OBJ_OSDEV_OPENFABRICS
Operating system openfabrics device. For instance the "mlx4_0" InfiniBand HCA, "hfi1_0" Omni-Path int...
Definition: hwloc.h:347
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition: hwloc.h:692
int hwloc_topology_is_thissystem(hwloc_topology_t restrict topology)
Does the topology context come from this system?
hwloc_const_cpuset_t hwloc_topology_get_complete_cpuset(hwloc_topology_t topology)
Get complete CPU set.
static hwloc_obj_t hwloc_get_next_osdev(hwloc_topology_t topology, hwloc_obj_t prev)
Get the next OS device in the system.
Definition: helper.h:1194
int hwloc_bitmap_iszero(hwloc_const_bitmap_t bitmap)
Test whether bitmap bitmap is empty.
int hwloc_bitmap_copy(hwloc_bitmap_t dst, hwloc_const_bitmap_t src)
Copy the contents of bitmap src into the already allocated bitmap dst.
int hwloc_linux_read_path_as_cpumask(const char *path, hwloc_bitmap_t set)
Convert a linux kernel cpumask file path into a hwloc bitmap set.
static hwloc_obj_t hwloc_ibv_get_device_osdev_by_name(hwloc_topology_t topology, const char *ibname)
Get the hwloc OS device object corresponding to the OpenFabrics device named ibname.
Definition: openfabrics-verbs.h:106
static int hwloc_ibv_get_device_cpuset(hwloc_topology_t topology, struct ibv_device *ibdev, hwloc_cpuset_t set)
Get the CPU set of processors that are physically close to device ibdev.
Definition: openfabrics-verbs.h:62
static hwloc_obj_t hwloc_ibv_get_device_osdev(hwloc_topology_t topology, struct ibv_device *ibdev)
Get the hwloc OS device object corresponding to the OpenFabrics device ibdev.
Definition: openfabrics-verbs.h:134
Structure of a topology object.
Definition: hwloc.h:396
char * name
Object-specific name if any. Mostly used for identifying OS devices and Misc objects where a name str...
Definition: hwloc.h:408
union hwloc_obj_attr_u * attr
Object type-specific Attributes, may be NULL if no attribute value was found.
Definition: hwloc.h:415
struct hwloc_obj_attr_u::hwloc_osdev_attr_s osdev
hwloc_obj_osdev_type_t type
Definition: hwloc.h:666