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openfabrics-verbs.h
Go to the documentation of this file.
1 /*
2 * Copyright © 2009 CNRS
3 * Copyright © 2009-2010 inria. All rights reserved.
4 * Copyright © 2009-2010 Université Bordeaux 1
5 * Copyright © 2009-2011 Cisco Systems, Inc. All rights reserved.
6 * See COPYING in top-level directory.
7 */
8
9 /** \file
10 * \brief Macros to help interaction between hwloc and OpenFabrics
11 * verbs.
12 *
13 * Applications that use both hwloc and OpenFabrics verbs may want to
14 * include this file so as to get topology information for OpenFabrics
15 * hardware.
16 *
17 */
18
19 #ifndef HWLOC_OPENFABRICS_VERBS_H
20 #define HWLOC_OPENFABRICS_VERBS_H
21
22 #include <hwloc.h>
23 #include <hwloc/autogen/config.h>
24 #include <hwloc/linux.h>
25
26 #include <infiniband/verbs.h>
27
28
29 #ifdef __cplusplus
30 extern "C" {
31 #endif
32
33
34 /** \defgroup hwlocality_openfabrics OpenFabrics-Specific Functions
35 * @{
36 */
37
38 /** \brief Get the CPU set of logical processors that are physically
39 * close to device \p ibdev.
40 *
41 * For the given OpenFabrics device \p ibdev, read the corresponding
42 * kernel-provided cpumap file and return the corresponding CPU set.
43 * This function is currently only implemented in a meaningful way for
44 * Linux; other systems will simply get a full cpuset.
45 */
46 static __hwloc_inline int
47 hwloc_ibv_get_device_cpuset(hwloc_topology_t topology __hwloc_attribute_unused,
48 struct ibv_device *ibdev, hwloc_cpuset_t set)
49 {
50 #ifdef HWLOC_LINUX_SYS
51 /* If we're on Linux, use the verbs-provided sysfs mechanism to
52 get the local cpus */
53 #define HWLOC_OPENFABRICS_VERBS_SYSFS_PATH_MAX 128
54 char path[HWLOC_OPENFABRICS_VERBS_SYSFS_PATH_MAX];
55 FILE *sysfile = NULL;
56
57 sprintf(path, "/sys/class/infiniband/%s/device/local_cpus",
58 ibv_get_device_name(ibdev));
59 sysfile = fopen(path, "r");
60 if (!sysfile)
61 return -1;
62
63 hwloc_linux_parse_cpumap_file(sysfile, set);
64
65 fclose(sysfile);
66 #else
67 /* Non-Linux systems simply get a full cpuset */
68 hwloc_bitmap_copy(set, hwloc_topology_get_complete_cpuset(topology));
69 #endif
70 return 0;
71 }
72
73 /** @} */
74
75
76 #ifdef __cplusplus
77 } /* extern "C" */
78 #endif
79
80
81 #endif /* HWLOC_OPENFABRICS_VERBS_H */
hwloc_bitmap_copy
HWLOC_DECLSPEC void hwloc_bitmap_copy(hwloc_bitmap_t dst, hwloc_const_bitmap_t src)
Copy the contents of bitmap src into the already allocated bitmap dst.
hwloc_topology_get_complete_cpuset
static __hwloc_inline hwloc_const_cpuset_t __hwloc_attribute_pure hwloc_topology_get_complete_cpuset(hwloc_topology_t topology)
Get complete CPU set.
Definition: helper.h:729
linux.h
Macros to help interaction between hwloc and Linux.
hwloc_linux_parse_cpumap_file
HWLOC_DECLSPEC int hwloc_linux_parse_cpumap_file(FILE *file, hwloc_cpuset_t set)
Convert a linux kernel cpumap file file into hwloc CPU set.
Definition: topology-linux.c:1332
hwloc_ibv_get_device_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)
Get the CPU set of logical processors that are physically close to device ibdev.
Definition: openfabrics-verbs.h:47
hwloc_topology
Definition: private.h:56
hwloc_bitmap_s
Definition: cpuset.c:38