From: Andrey Ignatov <rdna@fb.com>
Date: Tue, 24 Mar 2020 11:51:35 -0700
Subject: bpf: Document bpf_inspect drgn tool
Patch-mainline: v5.7-rc1
Git-commit: 8c061865f5ff66adca8056327accff1bf7d09d35
References: bsc#1177028
It's a follow-up for discussion in [1].
drgn tool bpf_inspect.py was merged to drgn repo in [2]. Document it
in kernel tree to make BPF developers aware that the tool exists and
can help with getting BPF state unavailable via UAPI.
For now it's just one tool but the doc is written in a way that allows
to cover more tools in the future if needed.
Please refer to the doc itself for more details.
The patch was tested by `make htmldocs` and sanity-checking that
resulting html looks good.
v2 -> v3:
- two sections: "Description" and "Getting started" (Daniel);
- add examples in "Getting started" section (Daniel);
- add "Customization" section to show how tool can be customized.
v1 -> v2:
- better "BPF drgn tools" section (Alexei)
[1] https://lore.kernel.org/bpf/20200228201514.GB51456@rdna-mbp/T/#mefed65e8a98116bd5d07d09a570a3eac46724951
[2] https://github.com/osandov/drgn/pull/49
Signed-off-by: Andrey Ignatov <rdna@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200324185135.1431038-1-rdna@fb.com
Acked-by: Gary Lin <glin@suse.com>
---
Documentation/bpf/drgn.rst | 213 ++++++++++++++++++++++++++++++++++++++++++++
Documentation/bpf/index.rst | 5 -
2 files changed, 216 insertions(+), 2 deletions(-)
create mode 100644 Documentation/bpf/drgn.rst
--- /dev/null
+++ b/Documentation/bpf/drgn.rst
@@ -0,0 +1,213 @@
+.. SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
+
+==============
+BPF drgn tools
+==============
+
+drgn scripts is a convenient and easy to use mechanism to retrieve arbitrary
+kernel data structures. drgn is not relying on kernel UAPI to read the data.
+Instead it's reading directly from ``/proc/kcore`` or vmcore and pretty prints
+the data based on DWARF debug information from vmlinux.
+
+This document describes BPF related drgn tools.
+
+See `drgn/tools`_ for all tools available at the moment and `drgn/doc`_ for
+more details on drgn itself.
+
+bpf_inspect.py
+--------------
+
+Description
+===========
+
+`bpf_inspect.py`_ is a tool intended to inspect BPF programs and maps. It can
+iterate over all programs and maps in the system and print basic information
+about these objects, including id, type and name.
+
+The main use-case `bpf_inspect.py`_ covers is to show BPF programs of types
+``BPF_PROG_TYPE_EXT`` and ``BPF_PROG_TYPE_TRACING`` attached to other BPF
+programs via ``freplace``/``fentry``/``fexit`` mechanisms, since there is no
+user-space API to get this information.
+
+Getting started
+===============
+
+List BPF programs (full names are obtained from BTF)::
+
+ % sudo bpf_inspect.py prog
+ 27: BPF_PROG_TYPE_TRACEPOINT tracepoint__tcp__tcp_send_reset
+ 4632: BPF_PROG_TYPE_CGROUP_SOCK_ADDR tw_ipt_bind
+ 49464: BPF_PROG_TYPE_RAW_TRACEPOINT raw_tracepoint__sched_process_exit
+
+List BPF maps::
+
+ % sudo bpf_inspect.py map
+ 2577: BPF_MAP_TYPE_HASH tw_ipt_vips
+ 4050: BPF_MAP_TYPE_STACK_TRACE stack_traces
+ 4069: BPF_MAP_TYPE_PERCPU_ARRAY ned_dctcp_cntr
+
+Find BPF programs attached to BPF program ``test_pkt_access``::
+
+ % sudo bpf_inspect.py p | grep test_pkt_access
+ 650: BPF_PROG_TYPE_SCHED_CLS test_pkt_access
+ 654: BPF_PROG_TYPE_TRACING test_main linked:[650->25: BPF_TRAMP_FEXIT test_pkt_access->test_pkt_access()]
+ 655: BPF_PROG_TYPE_TRACING test_subprog1 linked:[650->29: BPF_TRAMP_FEXIT test_pkt_access->test_pkt_access_subprog1()]
+ 656: BPF_PROG_TYPE_TRACING test_subprog2 linked:[650->31: BPF_TRAMP_FEXIT test_pkt_access->test_pkt_access_subprog2()]
+ 657: BPF_PROG_TYPE_TRACING test_subprog3 linked:[650->21: BPF_TRAMP_FEXIT test_pkt_access->test_pkt_access_subprog3()]
+ 658: BPF_PROG_TYPE_EXT new_get_skb_len linked:[650->16: BPF_TRAMP_REPLACE test_pkt_access->get_skb_len()]
+ 659: BPF_PROG_TYPE_EXT new_get_skb_ifindex linked:[650->23: BPF_TRAMP_REPLACE test_pkt_access->get_skb_ifindex()]
+ 660: BPF_PROG_TYPE_EXT new_get_constant linked:[650->19: BPF_TRAMP_REPLACE test_pkt_access->get_constant()]
+
+It can be seen that there is a program ``test_pkt_access``, id 650 and there
+are multiple other tracing and ext programs attached to functions in
+``test_pkt_access``.
+
+For example the line::
+
+ 658: BPF_PROG_TYPE_EXT new_get_skb_len linked:[650->16: BPF_TRAMP_REPLACE test_pkt_access->get_skb_len()]
+
+, means that BPF program id 658, type ``BPF_PROG_TYPE_EXT``, name
+``new_get_skb_len`` replaces (``BPF_TRAMP_REPLACE``) function ``get_skb_len()``
+that has BTF id 16 in BPF program id 650, name ``test_pkt_access``.
+
+Getting help:
+
+.. code-block:: none
+
+ % sudo bpf_inspect.py
+ usage: bpf_inspect.py [-h] {prog,p,map,m} ...
+
+ drgn script to list BPF programs or maps and their properties
+ unavailable via kernel API.
+
+ See https://github.com/osandov/drgn/ for more details on drgn.
+
+ optional arguments:
+ -h, --help show this help message and exit
+
+ subcommands:
+ {prog,p,map,m}
+ prog (p) list BPF programs
+ map (m) list BPF maps
+
+Customization
+=============
+
+The script is intended to be customized by developers to print relevant
+information about BPF programs, maps and other objects.
+
+For example, to print ``struct bpf_prog_aux`` for BPF program id 53077:
+
+.. code-block:: none
+
+ % git diff
+ diff --git a/tools/bpf_inspect.py b/tools/bpf_inspect.py
+ index 650e228..aea2357 100755
+ --- a/tools/bpf_inspect.py
+ +++ b/tools/bpf_inspect.py
+ @@ -112,7 +112,9 @@ def list_bpf_progs(args):
+ if linked:
+ linked = f" linked:[{linked}]"
+
+ - print(f"{id_:>6}: {type_:32} {name:32} {linked}")
+ + if id_ == 53077:
+ + print(f"{id_:>6}: {type_:32} {name:32}")
+ + print(f"{bpf_prog.aux}")
+
+
+ def list_bpf_maps(args):
+
+It produces the output::
+
+ % sudo bpf_inspect.py p
+ 53077: BPF_PROG_TYPE_XDP tw_xdp_policer
+ *(struct bpf_prog_aux *)0xffff8893fad4b400 = {
+ .refcnt = (atomic64_t){
+ .counter = (long)58,
+ },
+ .used_map_cnt = (u32)1,
+ .max_ctx_offset = (u32)8,
+ .max_pkt_offset = (u32)15,
+ .max_tp_access = (u32)0,
+ .stack_depth = (u32)8,
+ .id = (u32)53077,
+ .func_cnt = (u32)0,
+ .func_idx = (u32)0,
+ .attach_btf_id = (u32)0,
+ .linked_prog = (struct bpf_prog *)0x0,
+ .verifier_zext = (bool)0,
+ .offload_requested = (bool)0,
+ .attach_btf_trace = (bool)0,
+ .func_proto_unreliable = (bool)0,
+ .trampoline_prog_type = (enum bpf_tramp_prog_type)BPF_TRAMP_FENTRY,
+ .trampoline = (struct bpf_trampoline *)0x0,
+ .tramp_hlist = (struct hlist_node){
+ .next = (struct hlist_node *)0x0,
+ .pprev = (struct hlist_node **)0x0,
+ },
+ .attach_func_proto = (const struct btf_type *)0x0,
+ .attach_func_name = (const char *)0x0,
+ .func = (struct bpf_prog **)0x0,
+ .jit_data = (void *)0x0,
+ .poke_tab = (struct bpf_jit_poke_descriptor *)0x0,
+ .size_poke_tab = (u32)0,
+ .ksym_tnode = (struct latch_tree_node){
+ .node = (struct rb_node [2]){
+ {
+ .__rb_parent_color = (unsigned long)18446612956263126665,
+ .rb_right = (struct rb_node *)0x0,
+ .rb_left = (struct rb_node *)0xffff88a0be3d0088,
+ },
+ {
+ .__rb_parent_color = (unsigned long)18446612956263126689,
+ .rb_right = (struct rb_node *)0x0,
+ .rb_left = (struct rb_node *)0xffff88a0be3d00a0,
+ },
+ },
+ },
+ .ksym_lnode = (struct list_head){
+ .next = (struct list_head *)0xffff88bf481830b8,
+ .prev = (struct list_head *)0xffff888309f536b8,
+ },
+ .ops = (const struct bpf_prog_ops *)xdp_prog_ops+0x0 = 0xffffffff820fa350,
+ .used_maps = (struct bpf_map **)0xffff889ff795de98,
+ .prog = (struct bpf_prog *)0xffffc9000cf2d000,
+ .user = (struct user_struct *)root_user+0x0 = 0xffffffff82444820,
+ .load_time = (u64)2408348759285319,
+ .cgroup_storage = (struct bpf_map *[2]){},
+ .name = (char [16])"tw_xdp_policer",
+ .security = (void *)0xffff889ff795d548,
+ .offload = (struct bpf_prog_offload *)0x0,
+ .btf = (struct btf *)0xffff8890ce6d0580,
+ .func_info = (struct bpf_func_info *)0xffff889ff795d240,
+ .func_info_aux = (struct bpf_func_info_aux *)0xffff889ff795de20,
+ .linfo = (struct bpf_line_info *)0xffff888a707afc00,
+ .jited_linfo = (void **)0xffff8893fad48600,
+ .func_info_cnt = (u32)1,
+ .nr_linfo = (u32)37,
+ .linfo_idx = (u32)0,
+ .num_exentries = (u32)0,
+ .extable = (struct exception_table_entry *)0xffffffffa032d950,
+ .stats = (struct bpf_prog_stats *)0x603fe3a1f6d0,
+ .work = (struct work_struct){
+ .data = (atomic_long_t){
+ .counter = (long)0,
+ },
+ .entry = (struct list_head){
+ .next = (struct list_head *)0x0,
+ .prev = (struct list_head *)0x0,
+ },
+ .func = (work_func_t)0x0,
+ },
+ .rcu = (struct callback_head){
+ .next = (struct callback_head *)0x0,
+ .func = (void (*)(struct callback_head *))0x0,
+ },
+ }
+
+
+.. Links
+.. _drgn/doc: https://drgn.readthedocs.io/en/latest/
+.. _drgn/tools: https://github.com/osandov/drgn/tree/master/tools
+.. _bpf_inspect.py:
+ https://github.com/osandov/drgn/blob/master/tools/bpf_inspect.py
--- a/Documentation/bpf/index.rst
+++ b/Documentation/bpf/index.rst
@@ -47,12 +47,13 @@ Program types
prog_flow_dissector
-Testing BPF
-===========
+Testing and debugging BPF
+=========================
.. toctree::
:maxdepth: 1
+ drgn
s390