linux-kernel - [PATCH bpf-next v4 7/9] libbpf: add support for tracing session

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Message-ID: <20251217095445.218428-8-dongml2@chinatelecom.cn>
Date: Wed, 17 Dec 2025 17:54:43 +0800
From: Menglong Dong <menglong8.dong@...il.com>
To: ast@...nel.org,
	andrii@...nel.org
Cc: davem@...emloft.net,
	dsahern@...nel.org,
	daniel@...earbox.net,
	martin.lau@...ux.dev,
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	dave.hansen@...ux.intel.com,
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Subject: [PATCH bpf-next v4 7/9] libbpf: add support for tracing session

Add BPF_TRACE_SESSION to libbpf and bpftool.

Signed-off-by: Menglong Dong <dongml2@...natelecom.cn>
---
 tools/bpf/bpftool/common.c | 1 +
 tools/lib/bpf/bpf.c        | 2 ++
 tools/lib/bpf/libbpf.c     | 3 +++
 3 files changed, 6 insertions(+)

diff --git a/tools/bpf/bpftool/common.c b/tools/bpf/bpftool/common.c
index e8daf963ecef..534be6cfa2be 100644
--- a/tools/bpf/bpftool/common.c
+++ b/tools/bpf/bpftool/common.c
@@ -1191,6 +1191,7 @@ const char *bpf_attach_type_input_str(enum bpf_attach_type t)
 	case BPF_TRACE_FENTRY:			return "fentry";
 	case BPF_TRACE_FEXIT:			return "fexit";
 	case BPF_MODIFY_RETURN:			return "mod_ret";
+	case BPF_TRACE_SESSION:			return "fsession";
 	case BPF_SK_REUSEPORT_SELECT:		return "sk_skb_reuseport_select";
 	case BPF_SK_REUSEPORT_SELECT_OR_MIGRATE:	return "sk_skb_reuseport_select_or_migrate";
 	default:	return libbpf_bpf_attach_type_str(t);
diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
index 21b57a629916..5042df4a5df7 100644
--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -794,6 +794,7 @@ int bpf_link_create(int prog_fd, int target_fd,
 	case BPF_TRACE_FENTRY:
 	case BPF_TRACE_FEXIT:
 	case BPF_MODIFY_RETURN:
+	case BPF_TRACE_SESSION:
 	case BPF_LSM_MAC:
 		attr.link_create.tracing.cookie = OPTS_GET(opts, tracing.cookie, 0);
 		if (!OPTS_ZEROED(opts, tracing))
@@ -917,6 +918,7 @@ int bpf_link_create(int prog_fd, int target_fd,
 	case BPF_TRACE_FENTRY:
 	case BPF_TRACE_FEXIT:
 	case BPF_MODIFY_RETURN:
+	case BPF_TRACE_SESSION:
 		return bpf_raw_tracepoint_open(NULL, prog_fd);
 	default:
 		return libbpf_err(err);
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index c7c79014d46c..0c095195df31 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -115,6 +115,7 @@ static const char * const attach_type_name[] = {
 	[BPF_TRACE_FENTRY]		= "trace_fentry",
 	[BPF_TRACE_FEXIT]		= "trace_fexit",
 	[BPF_MODIFY_RETURN]		= "modify_return",
+	[BPF_TRACE_SESSION]		= "trace_session",
 	[BPF_LSM_MAC]			= "lsm_mac",
 	[BPF_LSM_CGROUP]		= "lsm_cgroup",
 	[BPF_SK_LOOKUP]			= "sk_lookup",
@@ -9853,6 +9854,8 @@ static const struct bpf_sec_def section_defs[] = {
 	SEC_DEF("fentry.s+",		TRACING, BPF_TRACE_FENTRY, SEC_ATTACH_BTF | SEC_SLEEPABLE, attach_trace),
 	SEC_DEF("fmod_ret.s+",		TRACING, BPF_MODIFY_RETURN, SEC_ATTACH_BTF | SEC_SLEEPABLE, attach_trace),
 	SEC_DEF("fexit.s+",		TRACING, BPF_TRACE_FEXIT, SEC_ATTACH_BTF | SEC_SLEEPABLE, attach_trace),
+	SEC_DEF("fsession+",		TRACING, BPF_TRACE_SESSION, SEC_ATTACH_BTF, attach_trace),
+	SEC_DEF("fsession.s+",		TRACING, BPF_TRACE_SESSION, SEC_ATTACH_BTF | SEC_SLEEPABLE, attach_trace),
 	SEC_DEF("freplace+",		EXT, 0, SEC_ATTACH_BTF, attach_trace),
 	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),
-- 
2.52.0