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5b994ce0-1f98-4866-3770-08dcc91c852c X-MS-Exchange-CrossTenant-AuthSource: BLAPR10MB5267.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Aug 2024 17:52:31.1705 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: WUwjbyc4xWLs6CW3HAyrMNcE3bzyKtHGCIKlXJQOOmLovoGkV162QFyU1JlO9rba9M/BnKWkrLQxjfXE675Ckw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR10MB6605 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-08-30_10,2024-08-30_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 mlxlogscore=999 mlxscore=0 suspectscore=0 malwarescore=0 spamscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2407110000 definitions=main-2408300135 X-Proofpoint-GUID: xfJQERJxMghfOm3-HhRlBy-s_qu4wJqJ X-Proofpoint-ORIG-GUID: xfJQERJxMghfOm3-HhRlBy-s_qu4wJqJ On 30/08/2024 18:34, Eduard Zingerman wrote: > Create a BTF with endianness different from host, make a distilled > base/split BTF pair from it, dump as raw bytes, import again and > verify that endianness is preserved. > > Signed-off-by: Eduard Zingerman One small thing below, but Reviewed-by: Alan Maguire Tested-by: Alan Maguire Thanks! > --- > .../selftests/bpf/prog_tests/btf_distill.c | 73 +++++++++++++++++++ > 1 file changed, 73 insertions(+) > > diff --git a/tools/testing/selftests/bpf/prog_tests/btf_distill.c b/tools/testing/selftests/bpf/prog_tests/btf_distill.c > index bfbe795823a2..810b2e434562 100644 > --- a/tools/testing/selftests/bpf/prog_tests/btf_distill.c > +++ b/tools/testing/selftests/bpf/prog_tests/btf_distill.c > @@ -535,6 +535,77 @@ static void test_distilled_base_vmlinux(void) > btf__free(vmlinux_btf); > } > > +static bool is_host_big_endian(void) > +{ > + return htons(0x1234) == 0x1234; > +} > + > +/* Split and new base BTFs should inherit endianness from source BTF. */ > +static void test_distilled_endianness(void) > +{ > + struct btf *base = NULL, *split = NULL, *new_base = NULL, *new_split = NULL; > + struct btf *new_base1 = NULL, *new_split1 = NULL; > + enum btf_endianness inverse_endianness; > + const void *raw_data; > + __u32 size; > + > + printf("is_host_big_endian? %d\n", is_host_big_endian()); > + inverse_endianness = is_host_big_endian() ? BTF_LITTLE_ENDIAN : BTF_BIG_ENDIAN; > + base = btf__new_empty(); nit: I think you could avoid the need for is_host_big_endian() by doing this: inverse_endianness = btf__endianness(base) == BTF_LITTLE_ENDIAN ? BTF_BIG_ENDIAN : BTF_LITTLE_ENDIAN; > + btf__set_endianness(base, inverse_endianness); > + if (!ASSERT_OK_PTR(base, "empty_main_btf")) > + return; > + btf__add_int(base, "int", 4, BTF_INT_SIGNED); /* [1] int */ > + VALIDATE_RAW_BTF( > + base, > + "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED"); > + split = btf__new_empty_split(base); > + if (!ASSERT_OK_PTR(split, "empty_split_btf")) > + goto cleanup; > + btf__add_ptr(split, 1); > + VALIDATE_RAW_BTF( > + split, > + "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", > + "[2] PTR '(anon)' type_id=1"); > + if (!ASSERT_EQ(0, btf__distill_base(split, &new_base, &new_split), > + "distilled_base") || > + !ASSERT_OK_PTR(new_base, "distilled_base") || > + !ASSERT_OK_PTR(new_split, "distilled_split") || > + !ASSERT_EQ(2, btf__type_cnt(new_base), "distilled_base_type_cnt")) > + goto cleanup; > + VALIDATE_RAW_BTF( > + new_split, > + "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", > + "[2] PTR '(anon)' type_id=1"); > + > + raw_data = btf__raw_data(new_base, &size); > + if (!ASSERT_OK_PTR(raw_data, "btf__raw_data #1")) > + goto cleanup; > + new_base1 = btf__new(raw_data, size); > + if (!ASSERT_OK_PTR(new_base1, "new_base1 = btf__new()")) > + goto cleanup; > + raw_data = btf__raw_data(new_split, &size); > + if (!ASSERT_OK_PTR(raw_data, "btf__raw_data #2")) > + goto cleanup; > + new_split1 = btf__new_split(raw_data, size, new_base1); > + if (!ASSERT_OK_PTR(new_split1, "new_split1 = btf__new()")) > + goto cleanup; > + > + ASSERT_EQ(btf__endianness(new_base1), inverse_endianness, "new_base1 endianness"); > + ASSERT_EQ(btf__endianness(new_split1), inverse_endianness, "new_split1 endianness"); > + VALIDATE_RAW_BTF( > + new_split1, > + "[1] INT 'int' size=4 bits_offset=0 nr_bits=32 encoding=SIGNED", > + "[2] PTR '(anon)' type_id=1"); > +cleanup: > + btf__free(new_split1); > + btf__free(new_base1); > + btf__free(new_split); > + btf__free(new_base); > + btf__free(split); > + btf__free(base); > +} > + > void test_btf_distill(void) > { > if (test__start_subtest("distilled_base")) > @@ -549,4 +620,6 @@ void test_btf_distill(void) > test_distilled_base_multi_err2(); > if (test__start_subtest("distilled_base_vmlinux")) > test_distilled_base_vmlinux(); > + if (test__start_subtest("distilled_endianness")) > + test_distilled_endianness(); > }