NAME

bpftool-struct_ops - tool to register/unregister/introspect BPF struct_ops

SYNOPSIS

bpftool [OPTIONS] struct_ops COMMAND
 
OPTIONS := { { -j | --json } [{ -p | --pretty }] | { -d | --debug } | { -l | --legacy } }
 
COMMANDS := { show | list | dump | register | unregister | help }


STRUCT_OPS COMMANDS

bpftool struct_ops { show | list } [STRUCT_OPS_MAP]
bpftool struct_ops dump [STRUCT_OPS_MAP]
bpftool struct_ops register OBJ
bpftool struct_ops unregister STRUCT_OPS_MAP
bpftool struct_ops help


STRUCT_OPS_MAP := { id STRUCT_OPS_MAP_ID | name STRUCT_OPS_MAP_NAME }
OBJ := /a/file/of/bpf_struct_ops.o
 

DESCRIPTION

bpftool struct_ops { show | list } [STRUCT_OPS_MAP]
Show brief information about the struct_ops in the system. If STRUCT_OPS_MAP is specified, it shows information only for the given struct_ops. Otherwise, it lists all struct_ops currently existing in the system. Output will start with struct_ops map ID, followed by its map name and its struct_ops's kernel type.
bpftool struct_ops dump [STRUCT_OPS_MAP]
Dump details information about the struct_ops in the system. If STRUCT_OPS_MAP is specified, it dumps information only for the given struct_ops. Otherwise, it dumps all struct_ops currently existing in the system.
bpftool struct_ops register OBJ
Register bpf struct_ops from OBJ. All struct_ops under the ELF section ".struct_ops" will be registered to its kernel subsystem.
bpftool struct_ops unregister STRUCT_OPS_MAP
Unregister the STRUCT_OPS_MAP from the kernel subsystem.
bpftool struct_ops help
Print short help message.



OPTIONS

-h, --help
Print short help message (similar to bpftool help).
-V, --version
Print bpftool's version number (similar to bpftool version), the number of the libbpf version in use, and optional features that were included when bpftool was compiled. Optional features include linking against libbfd to provide the disassembler for JIT-ted programs ( bpftool prog dump jited) and usage of BPF skeletons (some features like bpftool prog profile or showing pids associated to BPF objects may rely on it).
-j, --json
Generate JSON output. For commands that cannot produce JSON, this option has no effect.
-p, --pretty
Generate human-readable JSON output. Implies -j.
-d, --debug
Print all logs available, even debug-level information. This includes logs from libbpf as well as from the verifier, when attempting to load programs.
-l, --legacy
Use legacy libbpf mode which has more relaxed BPF program requirements. By default, bpftool has more strict requirements about section names, changes pinning logic and doesn't support some of the older non-BTF map declarations. See https://github.com/libbpf/libbpf/wiki/Libbpf:-the-road-to-v1.0 for details.



EXAMPLES

# bpftool struct_ops show
 
100: dctcp           tcp_congestion_ops
105: cubic           tcp_congestion_ops


 
# bpftool struct_ops unregister id 105
 
Unregistered tcp_congestion_ops cubic id 105


 
# bpftool struct_ops register bpf_cubic.o
 
Registered tcp_congestion_ops cubic id 110


SEE ALSO