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tools lib bpf: Add flags to bpf_create_map()

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Commit 6c905981743 ("bpf: pre-allocate hash map elements") introduces
map_flags to bpf_attr for BPF_MAP_CREATE command. Expose this new
parameter in libbpf.

By exposing it, users can access flags such as whether or not to
preallocate the map.

Signed-off-by: Joe Stringer <joe@ovn.org>
Acked-by: Wang Nan <wangnan0@huawei.com>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Link: http://lkml.kernel.org/r/20161209024620.31660-4-joe@ovn.org
[ Added clarifying comment made by Wang Nan ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Joe Stringer 2016-12-08 18:46:16 -08:00 committed by Arnaldo Carvalho de Melo
parent 83d994d02b
commit a5580c7f7a
3 changed files with 5 additions and 3 deletions
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3
tools/lib/bpf/bpf.c
View File

@ -54,7 +54,7 @@ static int sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr,
} }
int bpf_create_map(enum bpf_map_type map_type, int key_size, int bpf_create_map(enum bpf_map_type map_type, int key_size,
int value_size, int max_entries) int value_size, int max_entries, __u32 map_flags)
{ {
union bpf_attr attr; union bpf_attr attr;
@ -64,6 +64,7 @@ int bpf_create_map(enum bpf_map_type map_type, int key_size,
attr.key_size = key_size; attr.key_size = key_size;
attr.value_size = value_size; attr.value_size = value_size;
attr.max_entries = max_entries; attr.max_entries = max_entries;
attr.map_flags = map_flags;
return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr)); return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
} }

2
tools/lib/bpf/bpf.h
View File

@ -24,7 +24,7 @@
#include <linux/bpf.h> #include <linux/bpf.h>
int bpf_create_map(enum bpf_map_type map_type, int key_size, int value_size, int bpf_create_map(enum bpf_map_type map_type, int key_size, int value_size,
int max_entries); int max_entries, __u32 map_flags);
/* Recommend log buffer size */ /* Recommend log buffer size */
#define BPF_LOG_BUF_SIZE 65536 #define BPF_LOG_BUF_SIZE 65536

3
tools/lib/bpf/libbpf.c
View File

@ -854,7 +854,8 @@ bpf_object__create_maps(struct bpf_object *obj)
*pfd = bpf_create_map(def->type, *pfd = bpf_create_map(def->type,
def->key_size, def->key_size,
def->value_size, def->value_size,
def->max_entries); def->max_entries,
0);
if (*pfd < 0) { if (*pfd < 0) {
size_t j; size_t j;
int err = *pfd; int err = *pfd;