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Sat, 01 Nov 2025 19:34:04 +0000 (GMT) Received: from pps.filterd (phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (8.18.1.2/8.18.1.2) with ESMTP id 5A1HaBd1021076; Sat, 1 Nov 2025 19:34:03 GMT Received: from pps.reinject (localhost [127.0.0.1]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 4a58n6s25p-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sat, 01 Nov 2025 19:34:03 +0000 Received: from phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 5A1JY0Gi007914; Sat, 1 Nov 2025 19:34:02 GMT Received: from ca-dev112.us.oracle.com (ca-dev112.us.oracle.com [10.129.136.47]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTP id 4a58n6s24r-2; Sat, 01 Nov 2025 19:34:02 +0000 From: Harshit Mogalapalli To: bpf@vger.kernel.org Cc: alan.maguire@oracle.com, Harshit Mogalapalli , Yonghong Song , Quentin Monnet , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Shuah Khan , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH v3 1/2] bpftool: Print map ID upon creation and support JSON output Date: Sat, 1 Nov 2025 12:33:54 -0700 Message-ID: <20251101193357.111186-2-harshit.m.mogalapalli@oracle.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20251101193357.111186-1-harshit.m.mogalapalli@oracle.com> References: <20251101193357.111186-1-harshit.m.mogalapalli@oracle.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-11-01_05,2025-10-29_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 bulkscore=0 malwarescore=0 spamscore=0 suspectscore=0 mlxscore=0 adultscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2510240000 definitions=main-2511010168 X-Proofpoint-ORIG-GUID: Eq8QbOvO5rNNgnfVg8gKNZ52jdWld5L5 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTAxMDE2MSBTYWx0ZWRfX/+JkroJITk1d 9uoLprI+lse2M5ghqbO47URBPQqi0yenLbLd9edVSpvSPDysodHa4gBjNO0ENmp5w4R0ysyqxqR SsVv1fMcBGtw3tOjiRxFsiGK3/ta3e3tlF7HjKYUCN1VEUDvDqBEUV9Ic1RhqvncM9MrVnIwLIj yjnG7slArfLcAiSYzlmb5sPzAjfKo8J+bQVcjSh+dW+i+7wxaj0VfDdlX5+THH1rPAl5o+rP410 7XWYyB10recwPor1sgAgz+p5HLLXBKBmjK10GUF7dgiSJj74RkdNUgFM0OpLeCXUlp9vr3IAKZx 97fbttkcspRhFS2+Wn7acD0ILwtaZ1jemEDZBOqOWGj3wnw7MZrHROrzFhzlVFL4ok6YHBGXO/G Wx0+tCN3yVnagqRT1PT50oaxz8do8Q== X-Proofpoint-GUID: Eq8QbOvO5rNNgnfVg8gKNZ52jdWld5L5 X-Authority-Analysis: v=2.4 cv=AMtU3n5w c=1 sm=1 tr=0 ts=690660ac cx=c_pps a=OOZaFjgC48PWsiFpTAqLcw==:117 a=OOZaFjgC48PWsiFpTAqLcw==:17 a=6UeiqGixMTsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=NEAV23lmAAAA:8 a=VwQbUJbxAAAA:8 a=yPCof4ZbAAAA:8 a=cOsdffsr8CBnL9XL-nkA:9 a=cPQSjfK2_nFv0Q5t_7PE:22 Content-Type: text/plain; charset="utf-8" It is useful to print map ID on successful creation. JSON case: $ ./bpftool -j map create /sys/fs/bpf/test_map4 type hash key 4 value 8 ent= ries 128 name map4 {"id":12} Generic case: $ ./bpftool map create /sys/fs/bpf/test_map5 type hash key 4 value 8 entri= es 128 name map5 Map successfully created with ID: 15 Bpftool Issue: https://github.com/libbpf/bpftool/issues/121 Acked-by: Yonghong Song Reviewed-by: Quentin Monnet Signed-off-by: Harshit Mogalapalli --- v2->v3: remove a line break("\n" ) in p_err statement. [Thanks Quentin] --- tools/bpf/bpftool/map.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-) diff --git a/tools/bpf/bpftool/map.c b/tools/bpf/bpftool/map.c index c9de44a45778..f32ae5476d76 100644 --- a/tools/bpf/bpftool/map.c +++ b/tools/bpf/bpftool/map.c @@ -1251,6 +1251,8 @@ static int do_create(int argc, char **argv) LIBBPF_OPTS(bpf_map_create_opts, attr); enum bpf_map_type map_type =3D BPF_MAP_TYPE_UNSPEC; __u32 key_size =3D 0, value_size =3D 0, max_entries =3D 0; + struct bpf_map_info map_info =3D {}; + __u32 map_info_len =3D sizeof(map_info); const char *map_name =3D NULL; const char *pinfile; int err =3D -1, fd; @@ -1353,13 +1355,24 @@ static int do_create(int argc, char **argv) } =20 err =3D do_pin_fd(fd, pinfile); - close(fd); if (err) - goto exit; + goto close_fd; =20 - if (json_output) - jsonw_null(json_wtr); + err =3D bpf_obj_get_info_by_fd(fd, &map_info, &map_info_len); + if (err) { + p_err("Failed to fetch map info: %s", strerror(errno)); + goto close_fd; + } =20 + if (json_output) { + jsonw_start_object(json_wtr); + jsonw_int_field(json_wtr, "id", map_info.id); + jsonw_end_object(json_wtr); + } else { + printf("Map successfully created with ID: %u\n", map_info.id); + } +close_fd: + close(fd); exit: if (attr.inner_map_fd > 0) close(attr.inner_map_fd); --=20 2.50.1