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[54.191.147.77]) by smtp.gmail.com with ESMTPSA id j12sm458036pgs.83.2021.06.02.12.09.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Jun 2021 12:09:09 -0700 (PDT) From: Zvi Effron To: bpf@vger.kernel.org Cc: Alexei Starovoitov , "David S. Miller" , Daniel Borkmann , Jesper Dangaard Brouer , Andrii Nakryiko , Maciej Fijalkowski , Zvi Effron , Cody Haas , Lisa Watanabe Subject: [PATCH bpf-next v3 3/3] selftests/bpf: Add test for xdp_md context in BPF_PROG_TEST_RUN Date: Wed, 2 Jun 2021 19:08:15 +0000 Message-Id: <20210602190815.8096-4-zeffron@riotgames.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210602190815.8096-1-zeffron@riotgames.com> References: <20210602190815.8096-1-zeffron@riotgames.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Add a test for using xdp_md as a context to BPF_PROG_TEST_RUN for XDP programs. The test uses a BPF program that takes in a return value from XDP metadata, then reduces the size of the XDP metadata by 4 bytes. Test cases validate the possible failure cases for passing in invalid xdp_md contexts, that the return value is successfully passed in, and that the adjusted metadata is successfully copied out. Co-developed-by: Cody Haas Signed-off-by: Cody Haas Co-developed-by: Lisa Watanabe Signed-off-by: Lisa Watanabe Signed-off-by: Zvi Effron --- .../bpf/prog_tests/xdp_context_test_run.c | 114 ++++++++++++++++++ .../bpf/progs/test_xdp_context_test_run.c | 20 +++ 2 files changed, 134 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/xdp_context_test_run.c create mode 100644 tools/testing/selftests/bpf/progs/test_xdp_context_test_run.c diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_context_test_run.c b/tools/testing/selftests/bpf/prog_tests/xdp_context_test_run.c new file mode 100644 index 000000000000..0dbdebbc66ce --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/xdp_context_test_run.c @@ -0,0 +1,114 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include "test_xdp_context_test_run.skel.h" + +void test_xdp_context_test_run(void) +{ + struct test_xdp_context_test_run *skel = NULL; + char data[sizeof(pkt_v4) + sizeof(__u32)]; + char buf[128]; + char bad_ctx[sizeof(struct xdp_md)]; + struct xdp_md ctx_in, ctx_out; + DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts, + .data_in = &data, + .data_out = buf, + .data_size_in = sizeof(data), + .data_size_out = sizeof(buf), + .ctx_out = &ctx_out, + .ctx_size_out = sizeof(ctx_out), + .repeat = 1, + ); + int err, prog_fd; + + skel = test_xdp_context_test_run__open_and_load(); + if (!ASSERT_OK_PTR(skel, "skel")) + return; + prog_fd = bpf_program__fd(skel->progs._xdp_context); + + *(__u32 *)data = XDP_PASS; + *(struct ipv4_packet *)(data + sizeof(__u32)) = pkt_v4; + + memset(&ctx_in, 0, sizeof(ctx_in)); + opts.ctx_in = &ctx_in; + opts.ctx_size_in = sizeof(ctx_in); + + opts.ctx_in = &ctx_in; + opts.ctx_size_in = sizeof(ctx_in); + ctx_in.data_meta = 0; + ctx_in.data = sizeof(__u32); + ctx_in.data_end = ctx_in.data + sizeof(pkt_v4); + err = bpf_prog_test_run_opts(prog_fd, &opts); + ASSERT_OK(err, "bpf_prog_test_run(test1)"); + ASSERT_EQ(opts.retval, XDP_PASS, "test1-retval"); + ASSERT_EQ(opts.data_size_out, sizeof(pkt_v4), "test1-datasize"); + ASSERT_EQ(opts.ctx_size_out, opts.ctx_size_in, "test1-ctxsize"); + ASSERT_EQ(ctx_out.data_meta, 0, "test1-datameta"); + ASSERT_EQ(ctx_out.data, ctx_out.data_meta, "test1-data"); + ASSERT_EQ(ctx_out.data_end, sizeof(pkt_v4), "test1-dataend"); + + /* Data past the end of the kernel's struct xdp_md must be 0 */ + bad_ctx[sizeof(bad_ctx) - 1] = 1; + opts.ctx_in = bad_ctx; + opts.ctx_size_in = sizeof(bad_ctx); + err = bpf_prog_test_run_opts(prog_fd, &opts); + ASSERT_EQ(errno, 22, "test2-errno"); + ASSERT_ERR(err, "bpf_prog_test_run(test2)"); + + /* The egress cannot be specified */ + ctx_in.egress_ifindex = 1; + err = bpf_prog_test_run_opts(prog_fd, &opts); + ASSERT_EQ(errno, 22, "test3-errno"); + ASSERT_ERR(err, "bpf_prog_test_run(test3)"); + + /* data_meta must reference the start of data */ + ctx_in.data_meta = sizeof(__u32); + ctx_in.data = ctx_in.data_meta; + ctx_in.data_end = ctx_in.data + sizeof(pkt_v4); + ctx_in.egress_ifindex = 0; + err = bpf_prog_test_run_opts(prog_fd, &opts); + ASSERT_EQ(errno, 22, "test4-errno"); + ASSERT_ERR(err, "bpf_prog_test_run(test4)"); + + /* Metadata must be 32 bytes or smaller */ + ctx_in.data_meta = 0; + ctx_in.data = sizeof(__u32)*9; + ctx_in.data_end = ctx_in.data + sizeof(pkt_v4); + err = bpf_prog_test_run_opts(prog_fd, &opts); + ASSERT_EQ(errno, 22, "test5-errno"); + ASSERT_ERR(err, "bpf_prog_test_run(test5)"); + + /* Metadata's size must be a multiple of 4 */ + ctx_in.data = 3; + err = bpf_prog_test_run_opts(prog_fd, &opts); + ASSERT_EQ(errno, 22, "test6-errno"); + ASSERT_ERR(err, "bpf_prog_test_run(test6)"); + + /* Total size of data must match data_end - data_meta */ + ctx_in.data = 0; + ctx_in.data_end = sizeof(pkt_v4) - 4; + err = bpf_prog_test_run_opts(prog_fd, &opts); + ASSERT_EQ(errno, 22, "test7-errno"); + ASSERT_ERR(err, "bpf_prog_test_run(test7)"); + + ctx_in.data_end = sizeof(pkt_v4) + 4; + err = bpf_prog_test_run_opts(prog_fd, &opts); + ASSERT_EQ(errno, 22, "test8-errno"); + ASSERT_ERR(err, "bpf_prog_test_run(test8)"); + + /* RX queue cannot be specified without specifying an ingress */ + ctx_in.data_end = sizeof(pkt_v4); + ctx_in.ingress_ifindex = 0; + ctx_in.rx_queue_index = 1; + err = bpf_prog_test_run_opts(prog_fd, &opts); + ASSERT_EQ(errno, 22, "test9-errno"); + ASSERT_ERR(err, "bpf_prog_test_run(test9)"); + + ctx_in.ingress_ifindex = 1; + ctx_in.rx_queue_index = 1; + err = bpf_prog_test_run_opts(prog_fd, &opts); + ASSERT_EQ(errno, 22, "test10-errno"); + ASSERT_ERR(err, "bpf_prog_test_run(test10)"); + + test_xdp_context_test_run__destroy(skel); +} diff --git a/tools/testing/selftests/bpf/progs/test_xdp_context_test_run.c b/tools/testing/selftests/bpf/progs/test_xdp_context_test_run.c new file mode 100644 index 000000000000..56fd0995b67c --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_xdp_context_test_run.c @@ -0,0 +1,20 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include + +SEC("xdp") +int _xdp_context(struct xdp_md *xdp) +{ + void *data = (void *)(unsigned long)xdp->data; + __u32 *metadata = (void *)(unsigned long)xdp->data_meta; + __u32 ret; + + if (metadata + 1 > data) + return XDP_ABORTED; + ret = *metadata; + if (bpf_xdp_adjust_meta(xdp, 4)) + return XDP_ABORTED; + return ret; +} + +char _license[] SEC("license") = "GPL"; -- 2.31.1