From: Dmitry V. Levin <ldv@altlinux.org>
Date: Wed, 13 Mar 2019 18:38:51 +0000 (+0000)
Subject: bpf: implement decoding of BPF_MAP_LOOKUP_AND_DELETE_ELEM command
X-Git-Tag: v5.0~15
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=0373ab459fd1cd25c1c702b1094e517543a52cc9;p=strace

bpf: implement decoding of BPF_MAP_LOOKUP_AND_DELETE_ELEM command

BPF_MAP_LOOKUP_AND_DELETE_ELEM command was introduced by Linux commit
v4.20-rc1~151^2~32^2~11^2~2.

* bpf.c (decode_BPF_MAP_LOOKUP_AND_DELETE_ELEM): Alias
to decode_BPF_MAP_LOOKUP_ELEM.
(SYS_FUNC(bpf)) <bpf_cmd_decoders[]>: Add
BPF_CMD_ENTRY(BPF_MAP_LOOKUP_AND_DELETE_ELEM).
* tests/bpf.c (BPF_MAP_LOOKUP_AND_DELETE_ELEM_checks): Alias
to BPF_MAP_LOOKUP_ELEM_checks.
(main) <checks>: Add CHK(BPF_MAP_LOOKUP_AND_DELETE_ELEM).
---

diff --git a/bpf.c b/bpf.c
index 69c9a4f5..0bb02279 100644
--- a/bpf.c
+++ b/bpf.c
@@ -233,6 +233,8 @@ BEGIN_BPF_CMD_DECODER(BPF_MAP_LOOKUP_ELEM)
 }
 END_BPF_CMD_DECODER(RVAL_DECODED)
 
+#define decode_BPF_MAP_LOOKUP_AND_DELETE_ELEM decode_BPF_MAP_LOOKUP_ELEM
+
 BEGIN_BPF_CMD_DECODER(BPF_MAP_UPDATE_ELEM)
 {
 	PRINT_FIELD_FD("{", attr, map_fd, tcp);
@@ -866,6 +868,7 @@ SYS_FUNC(bpf)
 		BPF_CMD_ENTRY(BPF_RAW_TRACEPOINT_OPEN),
 		BPF_CMD_ENTRY(BPF_BTF_LOAD),
 		BPF_CMD_ENTRY(BPF_BTF_GET_FD_BY_ID),
+		BPF_CMD_ENTRY(BPF_MAP_LOOKUP_AND_DELETE_ELEM),
 	};
 
 	const unsigned int cmd = tcp->u_arg[0];
diff --git a/tests/bpf.c b/tests/bpf.c
index 8f887fb0..5c04a825 100644
--- a/tests/bpf.c
+++ b/tests/bpf.c
@@ -441,6 +441,8 @@ static const struct bpf_attr_check BPF_MAP_LOOKUP_ELEM_checks[] = {
 	}
 };
 
+#define BPF_MAP_LOOKUP_AND_DELETE_ELEM_checks BPF_MAP_LOOKUP_ELEM_checks
+
 static const struct bpf_attr_check BPF_MAP_UPDATE_ELEM_checks[] = {
 	{
 		.data = { .BPF_MAP_UPDATE_ELEM_data = { .map_fd = -1 } },
@@ -1158,6 +1160,7 @@ main(void)
 		CHK(BPF_RAW_TRACEPOINT_OPEN),
 		CHK(BPF_BTF_LOAD),
 		CHK(BPF_BTF_GET_FD_BY_ID),
+		CHK(BPF_MAP_LOOKUP_AND_DELETE_ELEM),
 	};
 
 	page_size = get_page_size();