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Tue, 28 Oct 2025 15:57:23 +0000 (GMT) Received: from pps.filterd (phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (8.18.1.2/8.18.1.2) with ESMTP id 59SEiCNf016883; Tue, 28 Oct 2025 15:57:21 GMT Received: from pps.reinject (localhost [127.0.0.1]) by phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 4a0n08cgx1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 28 Oct 2025 15:57:21 +0000 Received: from phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 59SFvDAe009896; Tue, 28 Oct 2025 15:57:21 GMT Received: from bpf.uk.oracle.com (dhcp-10-154-56-75.vpn.oracle.com [10.154.56.75]) by phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTP id 4a0n08cgqf-3; Tue, 28 Oct 2025 15:57:20 +0000 From: Alan Maguire To: andrii@kernel.org Cc: eddyz87@gmail.com, ast@kernel.org, daniel@iogearbox.net, martin.lau@linux.dev, acme@kernel.org, ttreyer@meta.com, yonghong.song@linux.dev, song@kernel.org, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, ihor.solodrai@linux.dev, bpf@vger.kernel.org, Alan Maguire Subject: [PATCH v2 bpf-next 2/2] selftests/bpf: Test parsing of (multi-)split BTF Date: Tue, 28 Oct 2025 15:57:09 +0000 Message-ID: <20251028155709.1265445-3-alan.maguire@oracle.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20251028155709.1265445-1-alan.maguire@oracle.com> References: <20251028155709.1265445-1-alan.maguire@oracle.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-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-10-28_06,2025-10-22_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 suspectscore=0 adultscore=0 bulkscore=0 phishscore=0 malwarescore=0 spamscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2510020000 definitions=main-2510280134 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMDI1MDAxMyBTYWx0ZWRfX5itypDd15pMW UD353avWmnMnYWKStONtipEzVc6qYbAlcFIbhbuhI+6JGyzbpCxWjItTkcjuHVYkP6EK+l+kxj8 M1EiE1lS7DQ69D6Semb2a8L1OdYrRC0y2XJNPdMHoW5bGlD2Ot9PS0ILOL6mHdOMJlRqjlOMpfz eBgHgelk0DjZo9hCXE1h89jzzkTRiqbMvevOZKnX7AiNRUXKKCzgARug4PQakfBVz3vSZjA2iE4 xAMibvQp2hjZxrAQcs7gj3UGhrDMf29to4IurYaDGQW8gBd6sGghFDL/roOT5Ye9QTsKQ97Sl0M mfZpSUJXpEj2Wi4S+16q1KoGFJKT36ASX6FN0VIBqjntbR8z1LoeP0YrS8gmkLsStIeOXMr+Z1F jHIDihaYGQOBjwQva1wf/dOJAk4LPQ== X-Authority-Analysis: v=2.4 cv=Z9vh3XRA c=1 sm=1 tr=0 ts=6900e7e3 cx=c_pps a=XiAAW1AwiKB2Y8Wsi+sD2Q==:117 a=XiAAW1AwiKB2Y8Wsi+sD2Q==:17 a=x6icFKpwvdMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=yPCof4ZbAAAA:8 a=qObbi30BQAl4vFSC2DMA:9 a=cPQSjfK2_nFv0Q5t_7PE:22 X-Proofpoint-ORIG-GUID: MzoOYF5pH1Rr6Ss2J4hsDTT7cpZ38pdT X-Proofpoint-GUID: MzoOYF5pH1Rr6Ss2J4hsDTT7cpZ38pdT Write raw BTF to files, parse it and compare to original; this allows us to test parsing of (multi-)split BTF code. Signed-off-by: Alan Maguire --- .../selftests/bpf/prog_tests/btf_split.c | 71 ++++++++++++++++++- 1 file changed, 70 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/bpf/prog_tests/btf_split.c b/tools/testing/selftests/bpf/prog_tests/btf_split.c index 3696fb9a05ed..ee1481c5fe27 100644 --- a/tools/testing/selftests/bpf/prog_tests/btf_split.c +++ b/tools/testing/selftests/bpf/prog_tests/btf_split.c @@ -12,11 +12,43 @@ static void btf_dump_printf(void *ctx, const char *fmt, va_list args) vfprintf(ctx, fmt, args); } +static int btf_raw_write(struct btf *btf, char *file) +{ + ssize_t written = 0; + const void *data; + __u32 size = 0; + int fd, ret; + + fd = mkstemp(file); + if (!ASSERT_GE(fd, 0, "create_file")) + return -errno; + + data = btf__raw_data(btf, &size); + if (!ASSERT_OK_PTR(data, "btf__raw_data")) { + close(fd); + return -EINVAL; + } + while (written < size) { + ret = write(fd, data + written, size - written); + if (!ASSERT_GE(ret, 0, "write succeeded")) { + close(fd); + return -errno; + } + written += ret; + } + close(fd); + return 0; +} + static void __test_btf_split(bool multi) { + char multisplit_btf_file[] = "/tmp/test_btf_multisplit.XXXXXX"; + char split_btf_file[] = "/tmp/test_btf_split.XXXXXX"; + char base_btf_file[] = "/tmp/test_btf_base.XXXXXX"; struct btf_dump *d = NULL; - const struct btf_type *t; + const struct btf_type *t, *ot; struct btf *btf1, *btf2, *btf3 = NULL; + struct btf *btf4, *btf5, *btf6 = NULL; int str_off, i, err; btf1 = btf__new_empty(); @@ -123,6 +155,35 @@ static void __test_btf_split(bool multi) " int uf2;\n" "};\n\n", "c_dump"); + /* write base, split BTFs to files and ensure parsing succeeds */ + if (btf_raw_write(btf1, base_btf_file) != 0) + goto cleanup; + if (btf_raw_write(btf2, split_btf_file) != 0) + goto cleanup; + btf4 = btf__parse(base_btf_file, NULL); + if (!ASSERT_OK_PTR(btf4, "parse_base")) + goto cleanup; + btf5 = btf__parse_split(split_btf_file, btf4); + if (!ASSERT_OK_PTR(btf5, "parse_split")) + goto cleanup; + if (multi) { + if (btf_raw_write(btf3, multisplit_btf_file) != 0) + goto cleanup; + btf6 = btf__parse_split(multisplit_btf_file, btf5); + if (!ASSERT_OK_PTR(btf5, "parse_multisplit")) + goto cleanup; + } else { + btf6 = btf5; + } + + /* compare parsed to original BTF */ + for (i = 1; i < btf__type_cnt(btf6); i++) { + t = btf__type_by_id(btf6, i); + ot = btf__type_by_id(btf3, i); + if (!ASSERT_EQ(memcmp(t, ot, sizeof(*ot)), 0, "cmp_parsed_orig_btf")) + goto cleanup; + } + cleanup: if (dump_buf_file) fclose(dump_buf_file); @@ -132,6 +193,14 @@ static void __test_btf_split(bool multi) btf__free(btf2); if (btf2 != btf3) btf__free(btf3); + btf__free(btf4); + btf__free(btf5); + if (btf5 != btf6) + btf__free(btf6); + unlink(base_btf_file); + unlink(split_btf_file); + if (multi) + unlink(multisplit_btf_file); } void test_btf_split(void) -- 2.39.3