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Miller" , Jakub Kicinski , Jesper Dangaard Brouer , netdev@vger.kernel.org Subject: [PATCH bpf-next v3 3/3] libbpf: add selftests for TC-BPF API Date: Wed, 21 Apr 2021 01:07:40 +0530 Message-Id: <20210420193740.124285-4-memxor@gmail.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210420193740.124285-1-memxor@gmail.com> References: <20210420193740.124285-1-memxor@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org This adds some basic tests for the low level bpf_tc_* API. Reviewed-by: Toke Høiland-Jørgensen Signed-off-by: Kumar Kartikeya Dwivedi --- .../selftests/bpf/prog_tests/test_tc_bpf.c | 169 ++++++++++++++++++ .../selftests/bpf/progs/test_tc_bpf_kern.c | 12 ++ 2 files changed, 181 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..563a3944553c --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/test_tc_bpf.c @@ -0,0 +1,169 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define LO_IFINDEX 1 + +static int test_tc_internal(int fd, __u32 parent_id) +{ + DECLARE_LIBBPF_OPTS(bpf_tc_opts, opts, .handle = 1, .priority = 10, + .class_id = TC_H_MAKE(1UL << 16, 1)); + struct bpf_tc_attach_id id = {}; + struct bpf_tc_info info = {}; + int ret; + + ret = bpf_tc_attach(fd, LO_IFINDEX, parent_id, &opts, &id); + if (!ASSERT_EQ(ret, 0, "bpf_tc_attach")) + return ret; + + ret = bpf_tc_get_info(LO_IFINDEX, parent_id, &id, &info); + if (!ASSERT_EQ(ret, 0, "bpf_tc_get_info")) + goto end; + + if (!ASSERT_EQ(info.id.handle, id.handle, "handle mismatch") || + !ASSERT_EQ(info.id.priority, id.priority, "priority mismatch") || + !ASSERT_EQ(info.id.handle, 1, "handle incorrect") || + !ASSERT_EQ(info.chain_index, 0, "chain_index incorrect") || + !ASSERT_EQ(info.id.priority, 10, "priority incorrect") || + !ASSERT_EQ(info.class_id, TC_H_MAKE(1UL << 16, 1), + "class_id incorrect") || + !ASSERT_EQ(info.protocol, ETH_P_ALL, "protocol incorrect")) + goto end; + + opts.replace = true; + ret = bpf_tc_attach(fd, LO_IFINDEX, parent_id, &opts, &id); + if (!ASSERT_EQ(ret, 0, "bpf_tc_attach in replace mode")) + return ret; + + /* Demonstrate changing attributes */ + opts.class_id = TC_H_MAKE(1UL << 16, 2); + + ret = bpf_tc_attach(fd, LO_IFINDEX, parent_id, &opts, &id); + if (!ASSERT_EQ(ret, 0, "bpf_tc attach in replace mode")) + goto end; + + ret = bpf_tc_get_info(LO_IFINDEX, parent_id, &id, &info); + if (!ASSERT_EQ(ret, 0, "bpf_tc_get_info")) + goto end; + + if (!ASSERT_EQ(info.class_id, TC_H_MAKE(1UL << 16, 2), + "class_id incorrect after replace")) + goto end; + if (!ASSERT_EQ(info.bpf_flags & TCA_BPF_FLAG_ACT_DIRECT, 1, + "direct action mode not set")) + goto end; + +end: + ret = bpf_tc_detach(LO_IFINDEX, parent_id, &id); + ASSERT_EQ(ret, 0, "detach failed"); + return ret; +} + +int test_tc_info(int fd) +{ + DECLARE_LIBBPF_OPTS(bpf_tc_opts, opts, .handle = 1, .priority = 10, + .class_id = TC_H_MAKE(1UL << 16, 1)); + struct bpf_tc_attach_id id = {}, old; + struct bpf_tc_info info = {}; + int ret; + + ret = bpf_tc_attach(fd, LO_IFINDEX, BPF_TC_CLSACT_INGRESS, &opts, &id); + if (!ASSERT_EQ(ret, 0, "bpf_tc_attach")) + return ret; + old = id; + + ret = bpf_tc_get_info(LO_IFINDEX, BPF_TC_CLSACT_INGRESS, &id, &info); + if (!ASSERT_EQ(ret, 0, "bpf_tc_get_info")) + goto end_old; + + if (!ASSERT_EQ(info.id.handle, id.handle, "handle mismatch") || + !ASSERT_EQ(info.id.priority, id.priority, "priority mismatch") || + !ASSERT_EQ(info.id.handle, 1, "handle incorrect") || + !ASSERT_EQ(info.chain_index, 0, "chain_index incorrect") || + !ASSERT_EQ(info.id.priority, 10, "priority incorrect") || + !ASSERT_EQ(info.class_id, TC_H_MAKE(1UL << 16, 1), + "class_id incorrect") || + !ASSERT_EQ(info.protocol, ETH_P_ALL, "protocol incorrect")) + goto end_old; + + /* choose a priority */ + opts.priority = 0; + ret = bpf_tc_attach(fd, LO_IFINDEX, BPF_TC_CLSACT_INGRESS, &opts, &id); + if (!ASSERT_EQ(ret, 0, "bpf_tc_attach")) + goto end_old; + + ret = bpf_tc_get_info(LO_IFINDEX, BPF_TC_CLSACT_INGRESS, &id, &info); + if (!ASSERT_EQ(ret, 0, "bpf_tc_get_info")) + goto end; + + if (!ASSERT_NEQ(id.priority, old.priority, "filter priority mismatch")) + goto end; + if (!ASSERT_EQ(info.id.priority, id.priority, "priority mismatch")) + goto end; + +end: + ret = bpf_tc_detach(LO_IFINDEX, BPF_TC_CLSACT_INGRESS, &id); + ASSERT_EQ(ret, 0, "detach failed"); +end_old: + ret = bpf_tc_detach(LO_IFINDEX, BPF_TC_CLSACT_INGRESS, &old); + ASSERT_EQ(ret, 0, "detach failed"); + 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 (!ASSERT_OK_PTR(obj, "bpf_object__open")) + return; + + clsp = bpf_object__find_program_by_title(obj, "classifier"); + if (!ASSERT_OK_PTR(clsp, "bpf_object__find_program_by_title")) + goto end; + + ret = bpf_object__load(obj); + if (!ASSERT_EQ(ret, 0, "bpf_object__load")) + goto end; + + cls_fd = bpf_program__fd(clsp); + + system("tc qdisc del dev lo clsact"); + + ret = test_tc_internal(cls_fd, BPF_TC_CLSACT_INGRESS); + if (!ASSERT_EQ(ret, 0, "test_tc_internal INGRESS")) + goto end; + + if (!ASSERT_EQ(system("tc qdisc del dev lo clsact"), 0, + "clsact qdisc delete failed")) + goto end; + + ret = test_tc_info(cls_fd); + if (!ASSERT_EQ(ret, 0, "test_tc_info")) + goto end; + + if (!ASSERT_EQ(system("tc qdisc del dev lo clsact"), 0, + "clsact qdisc delete failed")) + goto end; + + ret = test_tc_internal(cls_fd, BPF_TC_CLSACT_EGRESS); + if (!ASSERT_EQ(ret, 0, "test_tc_internal EGRESS")) + goto end; + + ASSERT_EQ(system("tc qdisc del dev lo clsact"), 0, + "clsact qdisc delete failed"); + +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..18a3a7ed924a --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_tc_bpf_kern.c @@ -0,0 +1,12 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include + +/* Dummy prog to test TC-BPF API */ + +SEC("classifier") +int cls(struct __sk_buff *skb) +{ + return 0; +} -- 2.30.2