netdev - [RFC PATCH v2 07/13] bpf: Register BPF_MAP_TRACE_{UPDATE,DELETE}

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Message-Id: <20210929235910.1765396-8-jevburton.kernel@gmail.com>
Date:   Wed, 29 Sep 2021 23:59:04 +0000
From:   Joe Burton <jevburton.kernel@...il.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>
Cc:     Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Petar Penkov <ppenkov@...gle.com>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, Joe Burton <jevburton@...gle.com>
Subject: [RFC PATCH v2 07/13] bpf: Register BPF_MAP_TRACE_{UPDATE,DELETE}_ELEM hooks

From: Joe Burton <jevburton@...gle.com>

Tracing programs may now load with this hook. There is not yet a way to
invoke those programs.

Signed-off-by: Joe Burton <jevburton@...gle.com>
---
 kernel/bpf/map_trace.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/kernel/bpf/map_trace.c b/kernel/bpf/map_trace.c
index 77a55f8cd119..d7c52e197482 100644
--- a/kernel/bpf/map_trace.c
+++ b/kernel/bpf/map_trace.c
@@ -335,3 +335,26 @@ void bpf_trace_map_delete_elem(struct bpf_map *map,
 	bpf_map_trace_run_progs(map, BPF_MAP_TRACE_DELETE_ELEM, &ctx);
 }
 
+DEFINE_BPF_MAP_TRACE_FUNC(BPF_MAP_TRACE_UPDATE_ELEM, void *key, void *value, u64 flags);
+DEFINE_BPF_MAP_TRACE_FUNC(BPF_MAP_TRACE_DELETE_ELEM, void *key);
+
+static struct bpf_map_trace_reg map_trace_update_elem_reg_info = {
+	.target = BPF_MAP_TRACE_FUNC(BPF_MAP_TRACE_UPDATE_ELEM),
+	.trace_type = BPF_MAP_TRACE_UPDATE_ELEM,
+};
+static struct bpf_map_trace_reg map_trace_delete_elem_reg_info = {
+	.target = BPF_MAP_TRACE_FUNC(BPF_MAP_TRACE_DELETE_ELEM),
+	.trace_type = BPF_MAP_TRACE_DELETE_ELEM,
+};
+
+static int __init bpf_map_trace_init(void)
+{
+	int err = bpf_map_trace_reg_target(&map_trace_update_elem_reg_info);
+
+	err = (err ? err :
+	       bpf_map_trace_reg_target(&map_trace_delete_elem_reg_info));
+	return err;
+}
+
+late_initcall(bpf_map_trace_init);
+
-- 
2.33.0.685.g46640cef36-goog