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Message-Id: <20210419121811.117400-5-memxor@gmail.com>
Date: Mon, 19 Apr 2021 17:48:11 +0530
From: Kumar Kartikeya Dwivedi <memxor@...il.com>
To: bpf@...r.kernel.org
Cc: Kumar Kartikeya Dwivedi <memxor@...il.com>,
Toke Høiland-Jørgensen <toke@...hat.com>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Jesper Dangaard Brouer <hawk@...nel.org>,
Jesper Dangaard Brouer <brouer@...hat.com>,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH bpf-next v2 4/4] libbpf: add selftests for TC-BPF API
This adds some basic tests for the low level bpf_tc_cls_* API.
Reviewed-by: Toke Høiland-Jørgensen <toke@...hat.com>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@...il.com>
---
.../selftests/bpf/prog_tests/test_tc_bpf.c | 112 ++++++++++++++++++
.../selftests/bpf/progs/test_tc_bpf_kern.c | 12 ++
2 files changed, 124 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/test_tc_bpf.c
create mode 100644 tools/testing/selftests/bpf/progs/test_tc_bpf_kern.c
diff --git a/tools/testing/selftests/bpf/prog_tests/test_tc_bpf.c b/tools/testing/selftests/bpf/prog_tests/test_tc_bpf.c
new file mode 100644
index 000000000000..945f3a1a72f8
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/test_tc_bpf.c
@@ -0,0 +1,112 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/bpf.h>
+#include <linux/err.h>
+#include <linux/limits.h>
+#include <bpf/libbpf.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <test_progs.h>
+#include <linux/if_ether.h>
+
+#define LO_IFINDEX 1
+
+static int test_tc_cls_internal(int fd, __u32 parent_id)
+{
+ DECLARE_LIBBPF_OPTS(bpf_tc_cls_opts, opts, .handle = 1, .priority = 10,
+ .class_id = TC_H_MAKE(1UL << 16, 1),
+ .chain_index = 5);
+ struct bpf_tc_cls_attach_id id = {};
+ struct bpf_tc_cls_info info = {};
+ int ret;
+
+ ret = bpf_tc_cls_attach(fd, LO_IFINDEX, parent_id, &opts, &id);
+ if (CHECK_FAIL(ret < 0))
+ return ret;
+
+ ret = bpf_tc_cls_get_info(fd, LO_IFINDEX, parent_id, NULL, &info);
+ if (CHECK_FAIL(ret < 0))
+ goto end;
+
+ ret = -1;
+
+ if (CHECK_FAIL(info.id.handle != id.handle) ||
+ CHECK_FAIL(info.id.chain_index != id.chain_index) ||
+ CHECK_FAIL(info.id.priority != id.priority) ||
+ CHECK_FAIL(info.id.handle != 1) ||
+ CHECK_FAIL(info.id.priority != 10) ||
+ CHECK_FAIL(info.class_id != TC_H_MAKE(1UL << 16, 1)) ||
+ CHECK_FAIL(info.id.chain_index != 5))
+ goto end;
+
+ ret = bpf_tc_cls_replace(fd, LO_IFINDEX, parent_id, &opts, &id);
+ if (CHECK_FAIL(ret < 0))
+ return ret;
+
+ if (CHECK_FAIL(info.id.handle != 1) ||
+ CHECK_FAIL(info.id.priority != 10) ||
+ CHECK_FAIL(info.class_id != TC_H_MAKE(1UL << 16, 1)))
+ goto end;
+
+ /* Demonstrate changing attributes */
+ opts.class_id = TC_H_MAKE(1UL << 16, 2);
+
+ ret = bpf_tc_cls_change(fd, LO_IFINDEX, parent_id, &opts, &info.id);
+ if (CHECK_FAIL(ret < 0))
+ goto end;
+
+ ret = bpf_tc_cls_get_info(fd, LO_IFINDEX, parent_id, NULL, &info);
+ if (CHECK_FAIL(ret < 0))
+ goto end;
+
+ if (CHECK_FAIL(info.class_id != TC_H_MAKE(1UL << 16, 2)))
+ goto end;
+ if (CHECK_FAIL((info.bpf_flags & TCA_BPF_FLAG_ACT_DIRECT) != 1))
+ goto end;
+
+end:
+ ret = bpf_tc_cls_detach(LO_IFINDEX, parent_id, &id);
+ CHECK_FAIL(ret < 0);
+ return ret;
+}
+
+void test_test_tc_bpf(void)
+{
+ const char *file = "./test_tc_bpf_kern.o";
+ struct bpf_program *clsp;
+ struct bpf_object *obj;
+ int cls_fd, ret;
+
+ obj = bpf_object__open(file);
+ if (CHECK_FAIL(IS_ERR_OR_NULL(obj)))
+ return;
+
+ clsp = bpf_object__find_program_by_title(obj, "classifier");
+ if (CHECK_FAIL(IS_ERR_OR_NULL(clsp)))
+ goto end;
+
+ ret = bpf_object__load(obj);
+ if (CHECK_FAIL(ret < 0))
+ goto end;
+
+ cls_fd = bpf_program__fd(clsp);
+
+ system("tc qdisc del dev lo clsact");
+
+ ret = test_tc_cls_internal(cls_fd, BPF_TC_CLSACT_INGRESS);
+ if (CHECK_FAIL(ret < 0))
+ goto end;
+
+ if (CHECK_FAIL(system("tc qdisc del dev lo clsact")))
+ goto end;
+
+ ret = test_tc_cls_internal(cls_fd, BPF_TC_CLSACT_EGRESS);
+ if (CHECK_FAIL(ret < 0))
+ goto end;
+
+ CHECK_FAIL(system("tc qdisc del dev lo clsact"));
+
+end:
+ bpf_object__close(obj);
+}
diff --git a/tools/testing/selftests/bpf/progs/test_tc_bpf_kern.c b/tools/testing/selftests/bpf/progs/test_tc_bpf_kern.c
new file mode 100644
index 000000000000..3dd40e21af8e
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/test_tc_bpf_kern.c
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+
+// Dummy prog to test TC-BPF API
+
+SEC("classifier")
+int cls(struct __sk_buff *skb)
+{
+ return 0;
+}
--
2.30.2
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