Hardware Locality (hwloc)  2.10.0
openfabrics-verbs.h
1 /*
2  * Copyright © 2009 CNRS
3  * Copyright © 2009-2023 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 
64 static __hwloc_inline int
65 hwloc_ibv_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
66  struct ibv_device *ibdev, hwloc_cpuset_t set)
67 {
68 #ifdef HWLOC_LINUX_SYS
69  /* If we're on Linux, use the verbs-provided sysfs mechanism to
70  get the local cpus */
71 #define HWLOC_OPENFABRICS_VERBS_SYSFS_PATH_MAX 128
72  char path[HWLOC_OPENFABRICS_VERBS_SYSFS_PATH_MAX];
73 
74  if (!hwloc_topology_is_thissystem(topology)) {
75  errno = EINVAL;
76  return -1;
77  }
78 
79  sprintf(path, "/sys/class/infiniband/%s/device/local_cpus",
80  ibv_get_device_name(ibdev));
81  if (hwloc_linux_read_path_as_cpumask(path, set) < 0
82  || hwloc_bitmap_iszero(set))
84 #else
85  /* Non-Linux systems simply get a full cpuset */
87 #endif
88  return 0;
89 }
90 
108 static __hwloc_inline hwloc_obj_t
110  const char *ibname)
111 {
112  hwloc_obj_t osdev = NULL;
113  while ((osdev = hwloc_get_next_osdev(topology, osdev)) != NULL) {
115  && osdev->name && !strcmp(ibname, osdev->name))
116  return osdev;
117  }
118  return NULL;
119 }
120 
136 static __hwloc_inline hwloc_obj_t
138  struct ibv_device *ibdev)
139 {
140  if (!hwloc_topology_is_thissystem(topology)) {
141  errno = EINVAL;
142  return NULL;
143  }
144  return hwloc_ibv_get_device_osdev_by_name(topology, ibv_get_device_name(ibdev));
145 }
146 
150 #ifdef __cplusplus
151 } /* extern "C" */
152 #endif
153 
154 
155 #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:161
@ HWLOC_OBJ_OSDEV_OPENFABRICS
Operating system openfabrics device. For instance the "mlx4_0" InfiniBand HCA, "hfi1_0" Omni-Path int...
Definition: hwloc.h:379
struct hwloc_topology * hwloc_topology_t
Topology context.
Definition: hwloc.h:742
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:1282
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:109
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:65
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:137
Structure of a topology object.
Definition: hwloc.h:431
char * name
Object-specific name if any. Mostly used for identifying OS devices and Misc objects where a name str...
Definition: hwloc.h:443
union hwloc_obj_attr_u * attr
Object type-specific Attributes, may be NULL if no attribute value was found.
Definition: hwloc.h:450
struct hwloc_obj_attr_u::hwloc_osdev_attr_s osdev
hwloc_obj_osdev_type_t type
Definition: hwloc.h:716