linux-kernel - [PATCH RESEND RFC bpf-next v1 6/8] libbpf: Support of bpf

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Date:   Wed, 12 Jan 2022 11:25:45 -0800
From:   Hao Luo <haoluo@...gle.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     Martin KaFai Lau <kafai@...com>, Song Liu <songliubraving@...com>,
        Yonghong Song <yhs@...com>, KP Singh <kpsingh@...nel.org>,
        Shakeel Butt <shakeelb@...gle.com>, Joe@...gle.com,
        Burton@...gle.com, jevburton.kernel@...il.com,
        Tejun Heo <tj@...nel.org>, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, Hao Luo <haoluo@...gle.com>
Subject: [PATCH RESEND RFC bpf-next v1 6/8] libbpf: Support of bpf_view prog type.

The previous patch introdued a new program type bpf_view. This
patch adds support for bpf_view in libbpf.

Signed-off-by: Hao Luo <haoluo@...gle.com>
---
 tools/lib/bpf/libbpf.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 7f10dd501a52..0d458e34d82c 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -8570,6 +8570,7 @@ static struct bpf_link *attach_raw_tp(const struct bpf_program *prog, long cooki
 static struct bpf_link *attach_trace(const struct bpf_program *prog, long cookie);
 static struct bpf_link *attach_lsm(const struct bpf_program *prog, long cookie);
 static struct bpf_link *attach_iter(const struct bpf_program *prog, long cookie);
+static struct bpf_link *attach_view(const struct bpf_program *prog, long cookie);
 
 static const struct bpf_sec_def section_defs[] = {
 	SEC_DEF("socket",		SOCKET_FILTER, 0, SEC_NONE | SEC_SLOPPY_PFX),
@@ -8599,6 +8600,7 @@ static const struct bpf_sec_def section_defs[] = {
 	SEC_DEF("lsm/",			LSM, BPF_LSM_MAC, SEC_ATTACH_BTF, attach_lsm),
 	SEC_DEF("lsm.s/",		LSM, BPF_LSM_MAC, SEC_ATTACH_BTF | SEC_SLEEPABLE, attach_lsm),
 	SEC_DEF("iter/",		TRACING, BPF_TRACE_ITER, SEC_ATTACH_BTF, attach_iter),
+	SEC_DEF("view/",		TRACING, BPF_TRACE_VIEW, SEC_ATTACH_BTF, attach_view),
 	SEC_DEF("syscall",		SYSCALL, 0, SEC_SLEEPABLE),
 	SEC_DEF("xdp_devmap/",		XDP, BPF_XDP_DEVMAP, SEC_ATTACHABLE),
 	SEC_DEF("xdp_cpumap/",		XDP, BPF_XDP_CPUMAP, SEC_ATTACHABLE),
@@ -8896,6 +8898,7 @@ static int bpf_object__collect_st_ops_relos(struct bpf_object *obj,
 #define BTF_TRACE_PREFIX "btf_trace_"
 #define BTF_LSM_PREFIX "bpf_lsm_"
 #define BTF_ITER_PREFIX "bpf_iter_"
+#define BTF_VIEW_PREFIX "bpf_view_"
 #define BTF_MAX_NAME_SIZE 128
 
 void btf_get_kernel_prefix_kind(enum bpf_attach_type attach_type,
@@ -8914,6 +8917,10 @@ void btf_get_kernel_prefix_kind(enum bpf_attach_type attach_type,
 		*prefix = BTF_ITER_PREFIX;
 		*kind = BTF_KIND_FUNC;
 		break;
+	case BPF_TRACE_VIEW:
+		*prefix = BTF_VIEW_PREFIX;
+		*kind = BTF_KIND_FUNC;
+		break;
 	default:
 		*prefix = "";
 		*kind = BTF_KIND_FUNC;
@@ -10575,6 +10582,20 @@ struct bpf_link *bpf_program__attach_freplace(const struct bpf_program *prog,
 	}
 }
 
+static struct bpf_link *attach_view(const struct bpf_program *prog, long cookie)
+{
+	const char *target_name;
+	const char *prefix = "view/";
+	int btf_id;
+
+	target_name = prog->sec_name + strlen(prefix);
+	btf_id = libbpf_find_vmlinux_btf_id(target_name, BPF_TRACE_VIEW);
+	if (btf_id < 0)
+		return libbpf_err_ptr(btf_id);
+
+	return bpf_program__attach_fd(prog, 0, btf_id, "view");
+}
+
 struct bpf_link *
 bpf_program__attach_iter(const struct bpf_program *prog,
 			 const struct bpf_iter_attach_opts *opts)
-- 
2.34.1.448.ga2b2bfdf31-goog