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authorHe Kuang <hekuang@huawei.com>2015-11-24 16:36:08 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2015-11-26 23:21:24 +0300
commit43798bf37215fe242e592fd4605d804e2da0781b (patch)
tree78938a19ac78dbc74c9d507ea3044b29ecb79e1c /tools/lib
parentdcdd184b60c3943fb678dcbaf899a26f845901ad (diff)
downloadlinux-43798bf37215fe242e592fd4605d804e2da0781b.tar.xz
bpf tools: Add helper function for updating bpf maps elements
Add bpf_map_update_elem() helper function which calls the sys_bpf syscall to update elements in bpf maps. Upcoming patches will use it to adjust data in map through the perf command line. Signed-off-by: He Kuang <hekuang@huawei.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1448372181-151723-4-git-send-email-wangnan0@huawei.com Signed-off-by: Wang Nan <wangnan0@huawei.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/lib')
-rw-r--r--tools/lib/bpf/bpf.c14
-rw-r--r--tools/lib/bpf/bpf.h2
2 files changed, 16 insertions, 0 deletions
diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index a6331050ab79..5bdc6eab6852 100644
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -83,3 +83,17 @@ int bpf_load_program(enum bpf_prog_type type, struct bpf_insn *insns,
log_buf[0] = 0;
return sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr));
}
+
+int bpf_map_update_elem(int fd, void *key, void *value,
+ u64 flags)
+{
+ union bpf_attr attr;
+
+ bzero(&attr, sizeof(attr));
+ attr.map_fd = fd;
+ attr.key = ptr_to_u64(key);
+ attr.value = ptr_to_u64(value);
+ attr.flags = flags;
+
+ return sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr));
+}
diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
index 854b7361b784..a76465541292 100644
--- a/tools/lib/bpf/bpf.h
+++ b/tools/lib/bpf/bpf.h
@@ -20,4 +20,6 @@ int bpf_load_program(enum bpf_prog_type type, struct bpf_insn *insns,
u32 kern_version, char *log_buf,
size_t log_buf_sz);
+int bpf_map_update_elem(int fd, void *key, void *value,
+ u64 flags);
#endif