linux-kernel - [PATCH 06/10] bpf tools: Support new map operations

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Date:	Thu, 17 Dec 2015 05:23:10 +0000
From:	Wang Nan <wangnan0@...wei.com>
To:	<ast@...nel.org>, <agartrell@...com>, <acme@...hat.com>,
	<bblanco@...mgrid.com>, <daniel@...earbox.net>,
	<daniel.wagner@...-carit.de>, <davem@...emloft.net>,
	<mingo@...nel.org>, <jolsa@...nel.org>, <xiakaixu@...wei.com>,
	<holzheu@...ux.vnet.ibm.com>, <yang.shi@...aro.org>
CC:	<linux-kernel@...r.kernel.org>, <pi3orama@....com>,
	Wang Nan <wangnan0@...wei.com>
Subject: [PATCH 06/10] bpf tools: Support new map operations

Add bpf_map_lookup_elem(), bpf_map_delete_elem() and bpf_map_get_next_key()
to libbpf so it can issue all BPF map operations.

Signed-off-by: Wang Nan <wangnan0@...wei.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/lib/bpf/bpf.c | 32 ++++++++++++++++++++++++++++++++
 tools/lib/bpf/bpf.h |  4 ++++
 2 files changed, 36 insertions(+)

diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index e0dccea..89c9d0b 100644
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -97,3 +97,35 @@ int bpf_map_update_elem(int fd, void *key, void *value,
 
 	return sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr));
 }
+
+int bpf_map_lookup_elem(int fd, void *key, void *value)
+{
+	union bpf_attr attr = {
+		.map_fd = fd,
+		.key = ptr_to_u64(key),
+		.value = ptr_to_u64(value),
+	};      
+
+	return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));
+}
+
+int bpf_map_delete_elem(int fd, void *key)
+{
+	union bpf_attr attr = {
+		.map_fd = fd,
+		.key = ptr_to_u64(key),
+	};
+
+	return sys_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr));
+}
+
+int bpf_map_get_next_key(int fd, void *key, void *next_key)
+{
+	union bpf_attr attr = {
+		.map_fd = fd,
+		.key = ptr_to_u64(key),
+		.next_key = ptr_to_u64(next_key),
+	};
+
+	return sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr));
+}
diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
index 01a421a..3d22048 100644
--- a/tools/lib/bpf/bpf.h
+++ b/tools/lib/bpf/bpf.h
@@ -23,4 +23,8 @@ int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns,
 
 int bpf_map_update_elem(int fd, void *key, void *value,
 			__u64 flags);
+
+int bpf_map_lookup_elem(int fd, void *key, void *value);
+int bpf_map_delete_elem(int fd, void *key);
+int bpf_map_get_next_key(int fd, void *key, void *next_key);
 #endif
-- 
1.8.3.4

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