linux-kernel - [tip:perf/core] bpf tools: Add helper function for updating bpf maps elements

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Date:	Thu, 26 Nov 2015 23:47:21 -0800
From:	tip-bot for He Kuang <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	hekuang@...wei.com, linux-kernel@...r.kernel.org,
	masami.hiramatsu.pt@...achi.com, ast@...nel.org,
	lizefan@...wei.com, wangnan0@...wei.com, namhyung@...nel.org,
	acme@...hat.com, tglx@...utronix.de, mingo@...nel.org,
	hpa@...or.com
Subject: [tip:perf/core] bpf tools:
  Add helper function for updating bpf maps elements

Commit-ID:  43798bf37215fe242e592fd4605d804e2da0781b
Gitweb:     http://git.kernel.org/tip/43798bf37215fe242e592fd4605d804e2da0781b
Author:     He Kuang <hekuang@...wei.com>
AuthorDate: Tue, 24 Nov 2015 13:36:08 +0000
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 26 Nov 2015 17:21:24 -0300

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@...wei.com>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Wang Nan <wangnan0@...wei.com>
Cc: Zefan Li <lizefan@...wei.com>
Cc: pi3orama@....com
Link: http://lkml.kernel.org/r/1448372181-151723-4-git-send-email-wangnan0@huawei.com
Signed-off-by: Wang Nan <wangnan0@...wei.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/lib/bpf/bpf.c | 14 ++++++++++++++
 tools/lib/bpf/bpf.h |  2 ++
 2 files changed, 16 insertions(+)

diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index a633105..5bdc6ea 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 854b736..a764655 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
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