netdev - [RFC PATCH v2 10/13] Add bpf_map_trace_{update,delete}

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Date:   Wed, 29 Sep 2021 23:59:07 +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 10/13] Add bpf_map_trace_{update,delete}_elem() helper functions

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

These helpers invoke tracing programs attached to a given map.

Signed-off-by: Joe Burton <jevburton@...gle.com>
---
 include/linux/bpf.h  |  2 ++
 kernel/bpf/helpers.c | 29 +++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 73f4524c1c29..847501a69012 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -2148,6 +2148,8 @@ extern const struct bpf_func_proto bpf_for_each_map_elem_proto;
 extern const struct bpf_func_proto bpf_btf_find_by_name_kind_proto;
 extern const struct bpf_func_proto bpf_sk_setsockopt_proto;
 extern const struct bpf_func_proto bpf_sk_getsockopt_proto;
+extern const struct bpf_func_proto bpf_map_trace_update_elem_proto;
+extern const struct bpf_func_proto bpf_map_trace_delete_elem_proto;
 
 const struct bpf_func_proto *tracing_prog_func_proto(
   enum bpf_func_id func_id, const struct bpf_prog *prog);
diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index 1ffd469c217f..f6ebc519334a 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -1328,6 +1328,35 @@ void bpf_timer_cancel_and_free(void *val)
 	kfree(t);
 }
 
+BPF_CALL_4(bpf_map_trace_update_elem, struct bpf_map *, map,
+	   void *, key, void *, value, u64, flags)
+{
+	bpf_trace_map_update_elem(map, key, value, flags);
+	return 0;
+}
+
+const struct bpf_func_proto bpf_map_trace_update_elem_proto = {
+	.func		= bpf_map_trace_update_elem,
+	.ret_type	= RET_VOID,
+	.arg1_type	= ARG_CONST_MAP_PTR,
+	.arg2_type	= ARG_PTR_TO_MAP_KEY,
+	.arg3_type	= ARG_PTR_TO_MAP_VALUE,
+	.arg4_type	= ARG_ANYTHING,
+};
+
+BPF_CALL_2(bpf_map_trace_delete_elem, struct bpf_map *, map, void *, key)
+{
+	bpf_trace_map_delete_elem(map, key);
+	return 0;
+}
+
+const struct bpf_func_proto bpf_map_trace_delete_elem_proto = {
+	.func		= bpf_map_trace_delete_elem,
+	.ret_type	= RET_VOID,
+	.arg1_type	= ARG_CONST_MAP_PTR,
+	.arg2_type	= ARG_PTR_TO_MAP_KEY,
+};
+
 const struct bpf_func_proto bpf_get_current_task_proto __weak;
 const struct bpf_func_proto bpf_get_current_task_btf_proto __weak;
 const struct bpf_func_proto bpf_probe_read_user_proto __weak;
-- 
2.33.0.685.g46640cef36-goog