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Fri, 3 Jul 2026 12:57:02 +0000 (GMT) From: Maxim Khmelevskii To: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann Cc: bpf@vger.kernel.org, Ilya Leoshkevich , Heiko Carstens , Vasily Gorbik , Alexander Gordeev Subject: [PATCH bpf-next 2/2] selftests/bpf: Add test for bpf_get_smp_processor_id Date: Fri, 3 Jul 2026 14:51:36 +0200 Message-ID: <20260703125648.919196-6-max@linux.ibm.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260703125648.919196-4-max@linux.ibm.com> References: <20260703125648.919196-4-max@linux.ibm.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzAzMDEyNiBTYWx0ZWRfX8GnivEuOoj2j 0cele7rRVtjd04kz6JDsFMdQWTwcaGQV+fVzSRO06jpwZGj2JaBO7g/GJDGWAV/BSi4mm/7JFpG IDa3s0mtgheOSj1aRPCFdIYI1WzJEuaanGHQS3bqgyl0ZeKAqztO/wNPkE0ydihOaa2TZEHW+3T X7dTmLLTjXT8HvcKg3mEYMiYMdxcOKk9aUT5n9vEitnG/56UsWnR3E6383im86W8dam1LPxQ4mo 9CqbMlvOyE4ai/kd2+HvY7yvKfnR7uPqpCA4NpU3ShRXGDzIxuj+OXSmlheg1AgYTRQX7kBTGxQ tuhc3xo7bxadTkQy9y+Kv4xP4EA7APC0LAgjtHOH+XcI/ARxty22RW5LGFkGIcBNFo2M0JkHEjn upRdgxqmVoX0dbEAiuD0zsJQwshUW1L9N2Hk7U/W10RdKzIsvmLmNWtV1bHnxXn0MCCVQJ90DcU 1B7CXsLVZEzpElqXN0A== X-Proofpoint-Spam-Info: AW1haW4tMjYwNzAzMDEyNiBTYWx0ZWRfXxXN+wTXstuoX nLOKQFMXx/i5UqXhUQJYOlrcSm3s64HjkczbvsTnSCSrQS+5Iz44pkKLVctk5Dqn4leuvipN28N RC+8j8oW+gaqwi+81rX2yrVaBtPUn9k= X-Proofpoint-GUID: 9GURUdbV511eEeGPn7V7kRnAc5eSj6eT X-Proofpoint-ORIG-GUID: 9GURUdbV511eEeGPn7V7kRnAc5eSj6eT X-Authority-Analysis: v=2.4 cv=WZ88rUhX c=1 sm=1 tr=0 ts=6a47b1a2 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VnNF1IyMAAAA:8 a=op7KPUZqbHCrF8WiKDoA:9 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-07-03_02,2026-06-26_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 adultscore=0 phishscore=0 clxscore=1015 bulkscore=0 impostorscore=0 priorityscore=1501 lowpriorityscore=0 suspectscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607030126 Add a test which checks on each CPU that the bpf_get_smp_processor_id BPF helper is returning the correct CPU number. Signed-off-by: Maxim Khmelevskii Reviewed-by: Ilya Leoshkevich --- .../bpf/prog_tests/get_smp_processor_id.c | 45 +++++++++++++++++++ .../bpf/progs/get_smp_processor_id.c | 20 +++++++++ 2 files changed, 65 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/get_smp_processor_id.c create mode 100644 tools/testing/selftests/bpf/progs/get_smp_processor_id.c diff --git a/tools/testing/selftests/bpf/prog_tests/get_smp_processor_id.c b/tools/testing/selftests/bpf/prog_tests/get_smp_processor_id.c new file mode 100644 index 000000000000..1b5c738ab81f --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/get_smp_processor_id.c @@ -0,0 +1,45 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include "bpf/libbpf_internal.h" +#include "get_smp_processor_id.skel.h" + +void test_get_smp_processor_id(void) +{ + LIBBPF_OPTS(bpf_test_run_opts, opts, + .flags = BPF_F_TEST_RUN_ON_CPU, + .cpu = 0, + ); + struct get_smp_processor_id *skel; + int prog_fd, err, online_cpu_nr, i; + bool *online = NULL; + + err = parse_cpu_mask_file("/sys/devices/system/cpu/online", + &online, &online_cpu_nr); + if (!ASSERT_OK(err, "parse_cpu_mask_file")) + return; + + skel = get_smp_processor_id__open_and_load(); + if (!ASSERT_OK_PTR(skel, "get_smp_processor_id__open_and_load")) + goto cleanup; + + prog_fd = bpf_program__fd(skel->progs.call_bpf_get_smp_processor_id); + + for (i = 0; i < online_cpu_nr; i++) { + if (!online[i]) + continue; + + opts.cpu = i; + skel->bss->cpu_nr_result = -1; + + err = bpf_prog_test_run_opts(prog_fd, &opts); + if (!ASSERT_OK(err, "bpf_prog_test_run_opts")) + goto cleanup; + + ASSERT_EQ(skel->bss->cpu_nr_result, opts.cpu, "cpu_nr_result"); + } + +cleanup: + free(online); + get_smp_processor_id__destroy(skel); +} diff --git a/tools/testing/selftests/bpf/progs/get_smp_processor_id.c b/tools/testing/selftests/bpf/progs/get_smp_processor_id.c new file mode 100644 index 000000000000..cf4791a5cf07 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/get_smp_processor_id.c @@ -0,0 +1,20 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include "bpf_misc.h" + +__u64 cpu_nr_result; + +SEC("raw_tp") +void call_bpf_get_smp_processor_id(void) +{ + register __u64 r0 asm("r0") = -1; + asm volatile ("call %[bpf_get_smp_processor_id];" + : "+r"(r0) + : __imm(bpf_get_smp_processor_id) + : "r1", "r2", "r3", "r4", "r5", "memory"); + cpu_nr_result = r0; +} + +char _license[] SEC("license") = "GPL"; -- 2.54.0