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From: Kumar Kartikeya Dwivedi <memxor@gmail.com>
To: bpf@vger.kernel.org
Cc: Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Andrii Nakryiko <andrii@kernel.org>, Yonghong Song <yhs@fb.com>,
	Pavel Emelyanov <ovzxemul@gmail.com>,
	Alexander Mikhalitsyn <alexander@mihalicyn.com>,
	Andrei Vagin <avagin@gmail.com>,
	criu@openvz.org, io-uring@vger.kernel.org,
	linux-fsdevel@vger.kernel.org
Subject: [PATCH bpf-next v3 05/10] bpftool: Output io_uring iterator info
Date: Wed,  1 Dec 2021 09:53:28 +0530	[thread overview]
Message-ID: <20211201042333.2035153-6-memxor@gmail.com> (raw)
In-Reply-To: <20211201042333.2035153-1-memxor@gmail.com>

Output the sole field related to io_uring iterator (inode of attached
io_uring) so that it can be useful in informational and also debugging
cases (trying to find actual io_uring fd attached to the iterator).

Output:
89: iter  prog 262  target_name io_uring_file  io_uring_inode 16764
	pids test_progs(384)

[
  {
    "id": 123,
    "type": "iter",
    "prog_id": 463,
    "target_name": "io_uring_buf",
    "io_uring_inode": 16871,
    "pids": [
      {
        "pid": 443,
        "comm": "test_progs"
      }
    ]
  }
]

[
  {
    "id": 126,
    "type": "iter",
    "prog_id": 483,
    "target_name": "io_uring_file",
    "io_uring_inode": 16887,
    "pids": [
      {
        "pid": 448,
        "comm": "test_progs"
      }
    ]
  }
]

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
---
 tools/bpf/bpftool/link.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tools/bpf/bpftool/link.c b/tools/bpf/bpftool/link.c
index 2c258db0d352..409ae861b839 100644
--- a/tools/bpf/bpftool/link.c
+++ b/tools/bpf/bpftool/link.c
@@ -86,6 +86,12 @@ static bool is_iter_map_target(const char *target_name)
 	       strcmp(target_name, "bpf_sk_storage_map") == 0;
 }
 
+static bool is_iter_io_uring_target(const char *target_name)
+{
+	return strcmp(target_name, "io_uring_file") == 0 ||
+	       strcmp(target_name, "io_uring_buf") == 0;
+}
+
 static void show_iter_json(struct bpf_link_info *info, json_writer_t *wtr)
 {
 	const char *target_name = u64_to_ptr(info->iter.target_name);
@@ -94,6 +100,8 @@ static void show_iter_json(struct bpf_link_info *info, json_writer_t *wtr)
 
 	if (is_iter_map_target(target_name))
 		jsonw_uint_field(wtr, "map_id", info->iter.map.map_id);
+	else if (is_iter_io_uring_target(target_name))
+		jsonw_uint_field(wtr, "io_uring_inode", info->iter.io_uring.inode);
 }
 
 static int get_prog_info(int prog_id, struct bpf_prog_info *info)
@@ -204,6 +212,8 @@ static void show_iter_plain(struct bpf_link_info *info)
 
 	if (is_iter_map_target(target_name))
 		printf("map_id %u  ", info->iter.map.map_id);
+	else if (is_iter_io_uring_target(target_name))
+		printf("io_uring_inode %llu  ", info->iter.io_uring.inode);
 }
 
 static int show_link_close_plain(int fd, struct bpf_link_info *info)
-- 
2.34.1


  parent reply	other threads:[~2021-12-01  4:24 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-01  4:23 [PATCH bpf-next v3 00/10] Introduce BPF iterators for io_uring and epoll Kumar Kartikeya Dwivedi
2021-12-01  4:23 ` [PATCH bpf-next v3 01/10] io_uring: Implement eBPF iterator for registered buffers Kumar Kartikeya Dwivedi
2021-12-01  4:23 ` [PATCH bpf-next v3 02/10] bpf: Add bpf_page_to_pfn helper Kumar Kartikeya Dwivedi
2021-12-01  4:23 ` [PATCH bpf-next v3 03/10] io_uring: Implement eBPF iterator for registered files Kumar Kartikeya Dwivedi
2021-12-01  4:23 ` [PATCH bpf-next v3 04/10] epoll: Implement eBPF iterator for registered items Kumar Kartikeya Dwivedi
2021-12-01  4:23 ` Kumar Kartikeya Dwivedi [this message]
2021-12-01  4:23 ` [PATCH bpf-next v3 06/10] selftests/bpf: Add test for io_uring BPF iterators Kumar Kartikeya Dwivedi
2021-12-01  4:23 ` [PATCH bpf-next v3 07/10] selftests/bpf: Add test for epoll BPF iterator Kumar Kartikeya Dwivedi
2021-12-01  4:23 ` [PATCH bpf-next v3 08/10] selftests/bpf: Test partial reads for io_uring, epoll iterators Kumar Kartikeya Dwivedi
2021-12-01  4:23 ` [PATCH bpf-next v3 09/10] selftests/bpf: Fix btf_dump test for bpf_iter_link_info Kumar Kartikeya Dwivedi
2021-12-01  4:23 ` [PATCH RFC bpf-next v3 10/10] samples/bpf: Add example to checkpoint/restore io_uring Kumar Kartikeya Dwivedi

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