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Mon, 22 Jun 2026 18:40:59 -0700 (PDT) Received: from localhost.localdomain ([202.8.105.120]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2c7444aad83sm90093085ad.79.2026.06.22.18.40.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 22 Jun 2026 18:40:59 -0700 (PDT) From: Sun Jian To: bpf@vger.kernel.org Cc: netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev, paul.chaignon@gmail.com, Sun Jian Subject: [PATCH bpf v4] selftests/bpf: Cover partial copy of non-linear test_run output Date: Tue, 23 Jun 2026 09:40:27 +0800 Message-ID: <20260623014027.402820-1-sun.jian.kdev@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit prog_run_opts already verifies that BPF_PROG_TEST_RUN returns -ENOSPC for a short data_out buffer while still reporting the full output size through data_size_out. Add the same coverage for non-linear test_run output. Use pass-through TC and XDP programs with a 9000-byte packet, a 64-byte linear data area, and a 100-byte data_out buffer. The expected output spans both the linear data and the first fragment. Verify that test_run returns -ENOSPC, reports the full packet length through data_size_out, and copies the packet prefix into data_out for both non-linear skb and XDP frags paths. Signed-off-by: Sun Jian --- v4: - Send only the selftest patch; the fix patch has been applied to bpf/master. - Initialize data_out buffers to avoid reading uninitialized stack memory if bpf_prog_test_run_opts() fails unexpectedly. .../selftests/bpf/prog_tests/prog_run_opts.c | 70 +++++++++++++++++++ .../selftests/bpf/progs/test_pkt_access.c | 12 ++++ 2 files changed, 82 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/prog_run_opts.c b/tools/testing/selftests/bpf/prog_tests/prog_run_opts.c index 01f1d1b6715a..beb6fa78fd94 100644 --- a/tools/testing/selftests/bpf/prog_tests/prog_run_opts.c +++ b/tools/testing/selftests/bpf/prog_tests/prog_run_opts.c @@ -4,6 +4,10 @@ #include "test_pkt_access.skel.h" +#define NONLINEAR_PKT_LEN 9000 +#define NONLINEAR_LINEAR_DATA_LEN 64 +#define SHORT_OUT_LEN 100 + static const __u32 duration; static void check_run_cnt(int prog_fd, __u64 run_cnt) @@ -20,6 +24,69 @@ static void check_run_cnt(int prog_fd, __u64 run_cnt) "incorrect number of repetitions, want %llu have %llu\n", run_cnt, info.run_cnt); } +static void init_pkt(__u8 *pkt, size_t len) +{ + size_t i; + + for (i = 0; i < len; i++) + pkt[i] = i & 0xff; +} + +static void test_skb_nonlinear_data_out_partial(struct test_pkt_access *skel) +{ + LIBBPF_OPTS(bpf_test_run_opts, topts); + __u8 pkt[NONLINEAR_PKT_LEN]; + __u8 out[SHORT_OUT_LEN] = {}; + struct __sk_buff skb = {}; + int prog_fd, err; + + init_pkt(pkt, sizeof(pkt)); + + skb.data_end = NONLINEAR_LINEAR_DATA_LEN; + + topts.data_in = pkt; + topts.data_size_in = sizeof(pkt); + topts.data_out = out; + topts.data_size_out = sizeof(out); + topts.ctx_in = &skb; + topts.ctx_size_in = sizeof(skb); + + prog_fd = bpf_program__fd(skel->progs.tc_pass_prog); + err = bpf_prog_test_run_opts(prog_fd, &topts); + + ASSERT_EQ(err, -ENOSPC, "skb_partial_err"); + ASSERT_EQ(topts.data_size_out, sizeof(pkt), "skb_partial_size"); + ASSERT_OK(memcmp(out, pkt, sizeof(out)), "skb_partial_data"); +} + +static void test_xdp_nonlinear_data_out_partial(struct test_pkt_access *skel) +{ + LIBBPF_OPTS(bpf_test_run_opts, topts); + __u8 pkt[NONLINEAR_PKT_LEN]; + __u8 out[SHORT_OUT_LEN] = {}; + struct xdp_md ctx = {}; + int prog_fd, err; + + init_pkt(pkt, sizeof(pkt)); + + ctx.data = 0; + ctx.data_end = NONLINEAR_LINEAR_DATA_LEN; + + topts.data_in = pkt; + topts.data_size_in = sizeof(pkt); + topts.data_out = out; + topts.data_size_out = sizeof(out); + topts.ctx_in = &ctx; + topts.ctx_size_in = sizeof(ctx); + + prog_fd = bpf_program__fd(skel->progs.xdp_frags_pass_prog); + err = bpf_prog_test_run_opts(prog_fd, &topts); + + ASSERT_EQ(err, -ENOSPC, "xdp_partial_err"); + ASSERT_EQ(topts.data_size_out, sizeof(pkt), "xdp_partial_size"); + ASSERT_OK(memcmp(out, pkt, sizeof(out)), "xdp_partial_data"); +} + void test_prog_run_opts(void) { struct test_pkt_access *skel; @@ -69,6 +136,9 @@ void test_prog_run_opts(void) run_cnt += topts.repeat; check_run_cnt(prog_fd, run_cnt); + test_skb_nonlinear_data_out_partial(skel); + test_xdp_nonlinear_data_out_partial(skel); + cleanup: if (skel) test_pkt_access__destroy(skel); diff --git a/tools/testing/selftests/bpf/progs/test_pkt_access.c b/tools/testing/selftests/bpf/progs/test_pkt_access.c index bce7173152c6..cd284401eebd 100644 --- a/tools/testing/selftests/bpf/progs/test_pkt_access.c +++ b/tools/testing/selftests/bpf/progs/test_pkt_access.c @@ -150,3 +150,15 @@ int test_pkt_access(struct __sk_buff *skb) return TC_ACT_UNSPEC; } + +SEC("tc") +int tc_pass_prog(struct __sk_buff *skb) +{ + return TC_ACT_OK; +} + +SEC("xdp.frags") +int xdp_frags_pass_prog(struct xdp_md *ctx) +{ + return XDP_PASS; +} -- 2.43.0