tools, bpftool: Clean subcommand help messages

This is a clean-up for the formatting of the do_help functions for
bpftool's subcommands. The following fixes are included:

- Do not use argv[-2] for "iter" help message, as the help is shown by
  default if no "iter" action is selected, resulting in messages looking
  like "./bpftool bpftool pin...".

- Do not print unused HELP_SPEC_PROGRAM in help message for "bpftool
  link".

- Andrii used argument indexing to avoid having multiple occurrences of
  bin_name and argv[-2] in the fprintf() for the help message, for
  "bpftool gen" and "bpftool link". Let's reuse this for all other help
  functions. We can remove up to thirty arguments for the "bpftool map"
  help message.

- Harmonise all functions, e.g. use ending quotes-comma on a separate
  line.
Signed-off-by: Quentin Monnet <quentin@isovalent.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200523010751.23465-1-quentin@isovalent.comSigned-off-by: Alexei Starovoitov <ast@kernel.org>

tools/bpf/bpftool/btf.c

@@ -951,9 +951,9 @@ static int do_help(int argc, char **argv)
 	}
 
 	fprintf(stderr,
-		"Usage: %s btf { show | list } [id BTF_ID]\n"
-		"       %s btf dump BTF_SRC [format FORMAT]\n"
-		"       %s btf help\n"
+		"Usage: %1$s %2$s { show | list } [id BTF_ID]\n"
+		"       %1$s %2$s dump BTF_SRC [format FORMAT]\n"
+		"       %1$s %2$s help\n"
 		"\n"
 		"       BTF_SRC := { id BTF_ID | prog PROG | map MAP [{key | value | kv | all}] | file FILE }\n"
 		"       FORMAT  := { raw | c }\n"
@@ -961,7 +961,7 @@ static int do_help(int argc, char **argv)
 		"       " HELP_SPEC_PROGRAM "\n"
 		"       " HELP_SPEC_OPTIONS "\n"
 		"",
-		bin_name, bin_name, bin_name);
+		bin_name, "btf");
 
 	return 0;
 }

tools/bpf/bpftool/cgroup.c

@@ -491,20 +491,18 @@ static int do_help(int argc, char **argv)
 	}
 
 	fprintf(stderr,
-		"Usage: %s %s { show | list } CGROUP [**effective**]\n"
-		"       %s %s tree [CGROUP_ROOT] [**effective**]\n"
-		"       %s %s attach CGROUP ATTACH_TYPE PROG [ATTACH_FLAGS]\n"
-		"       %s %s detach CGROUP ATTACH_TYPE PROG\n"
-		"       %s %s help\n"
+		"Usage: %1$s %2$s { show | list } CGROUP [**effective**]\n"
+		"       %1$s %2$s tree [CGROUP_ROOT] [**effective**]\n"
+		"       %1$s %2$s attach CGROUP ATTACH_TYPE PROG [ATTACH_FLAGS]\n"
+		"       %1$s %2$s detach CGROUP ATTACH_TYPE PROG\n"
+		"       %1$s %2$s help\n"
 		"\n"
 		HELP_SPEC_ATTACH_TYPES "\n"
 		"       " HELP_SPEC_ATTACH_FLAGS "\n"
 		"       " HELP_SPEC_PROGRAM "\n"
 		"       " HELP_SPEC_OPTIONS "\n"
 		"",
-		bin_name, argv[-2],
-		bin_name, argv[-2], bin_name, argv[-2],
-		bin_name, argv[-2], bin_name, argv[-2]);
+		bin_name, argv[-2]);
 
 	return 0;
 }

tools/bpf/bpftool/feature.c

@@ -937,12 +937,12 @@ static int do_help(int argc, char **argv)
 	}
 
 	fprintf(stderr,
-		"Usage: %s %s probe [COMPONENT] [full] [unprivileged] [macros [prefix PREFIX]]\n"
-		"       %s %s help\n"
+		"Usage: %1$s %2$s probe [COMPONENT] [full] [unprivileged] [macros [prefix PREFIX]]\n"
+		"       %1$s %2$s help\n"
 		"\n"
 		"       COMPONENT := { kernel | dev NAME }\n"
 		"",
-		bin_name, argv[-2], bin_name, argv[-2]);
+		bin_name, argv[-2]);
 
 	return 0;
 }

tools/bpf/bpftool/gen.c

@@ -586,12 +586,12 @@ static int do_help(int argc, char **argv)
 	}
 
 	fprintf(stderr,
-		"Usage: %1$s gen skeleton FILE\n"
-		"       %1$s gen help\n"
+		"Usage: %1$s %2$s skeleton FILE\n"
+		"       %1$s %2$s help\n"
 		"\n"
 		"       " HELP_SPEC_OPTIONS "\n"
 		"",
-		bin_name);
+		bin_name, "gen");
 
 	return 0;
 }

tools/bpf/bpftool/iter.c

@@ -68,10 +68,10 @@ static int do_pin(int argc, char **argv)
 static int do_help(int argc, char **argv)
 {
 	fprintf(stderr,
-		"Usage: %s %s pin OBJ PATH\n"
-		"       %s %s help\n"
-		"\n",
-		bin_name, argv[-2], bin_name, argv[-2]);
+		"Usage: %1$s %2$s pin OBJ PATH\n"
+		"       %1$s %2$s help\n"
+		"",
+		bin_name, "iter");
 
 	return 0;
 }

tools/bpf/bpftool/link.c

@@ -312,7 +312,6 @@ static int do_help(int argc, char **argv)
 		"       %1$s %2$s help\n"
 		"\n"
 		"       " HELP_SPEC_LINK "\n"
-		"       " HELP_SPEC_PROGRAM "\n"
 		"       " HELP_SPEC_OPTIONS "\n"
 		"",
 		bin_name, argv[-2]);

tools/bpf/bpftool/map.c

@@ -1561,24 +1561,24 @@ static int do_help(int argc, char **argv)
 	}
 
 	fprintf(stderr,
-		"Usage: %s %s { show | list }   [MAP]\n"
-		"       %s %s create     FILE type TYPE key KEY_SIZE value VALUE_SIZE \\\n"
-		"                              entries MAX_ENTRIES name NAME [flags FLAGS] \\\n"
-		"                              [dev NAME]\n"
-		"       %s %s dump       MAP\n"
-		"       %s %s update     MAP [key DATA] [value VALUE] [UPDATE_FLAGS]\n"
-		"       %s %s lookup     MAP [key DATA]\n"
-		"       %s %s getnext    MAP [key DATA]\n"
-		"       %s %s delete     MAP  key DATA\n"
-		"       %s %s pin        MAP  FILE\n"
-		"       %s %s event_pipe MAP [cpu N index M]\n"
-		"       %s %s peek       MAP\n"
-		"       %s %s push       MAP value VALUE\n"
-		"       %s %s pop        MAP\n"
-		"       %s %s enqueue    MAP value VALUE\n"
-		"       %s %s dequeue    MAP\n"
-		"       %s %s freeze     MAP\n"
-		"       %s %s help\n"
+		"Usage: %1$s %2$s { show | list }   [MAP]\n"
+		"       %1$s %2$s create     FILE type TYPE key KEY_SIZE value VALUE_SIZE \\\n"
+		"                                  entries MAX_ENTRIES name NAME [flags FLAGS] \\\n"
+		"                                  [dev NAME]\n"
+		"       %1$s %2$s dump       MAP\n"
+		"       %1$s %2$s update     MAP [key DATA] [value VALUE] [UPDATE_FLAGS]\n"
+		"       %1$s %2$s lookup     MAP [key DATA]\n"
+		"       %1$s %2$s getnext    MAP [key DATA]\n"
+		"       %1$s %2$s delete     MAP  key DATA\n"
+		"       %1$s %2$s pin        MAP  FILE\n"
+		"       %1$s %2$s event_pipe MAP [cpu N index M]\n"
+		"       %1$s %2$s peek       MAP\n"
+		"       %1$s %2$s push       MAP value VALUE\n"
+		"       %1$s %2$s pop        MAP\n"
+		"       %1$s %2$s enqueue    MAP value VALUE\n"
+		"       %1$s %2$s dequeue    MAP\n"
+		"       %1$s %2$s freeze     MAP\n"
+		"       %1$s %2$s help\n"
 		"\n"
 		"       " HELP_SPEC_MAP "\n"
 		"       DATA := { [hex] BYTES }\n"
@@ -1593,11 +1593,6 @@ static int do_help(int argc, char **argv)
 		"                 queue | stack | sk_storage | struct_ops }\n"
 		"       " HELP_SPEC_OPTIONS "\n"
 		"",
-		bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
-		bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
-		bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
-		bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
-		bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
 		bin_name, argv[-2]);
 
 	return 0;

tools/bpf/bpftool/net.c

@@ -458,10 +458,10 @@ static int do_help(int argc, char **argv)
 	}
 
 	fprintf(stderr,
-		"Usage: %s %s { show | list } [dev <devname>]\n"
-		"       %s %s attach ATTACH_TYPE PROG dev <devname> [ overwrite ]\n"
-		"       %s %s detach ATTACH_TYPE dev <devname>\n"
-		"       %s %s help\n"
+		"Usage: %1$s %2$s { show | list } [dev <devname>]\n"
+		"       %1$s %2$s attach ATTACH_TYPE PROG dev <devname> [ overwrite ]\n"
+		"       %1$s %2$s detach ATTACH_TYPE dev <devname>\n"
+		"       %1$s %2$s help\n"
 		"\n"
 		"       " HELP_SPEC_PROGRAM "\n"
 		"       ATTACH_TYPE := { xdp | xdpgeneric | xdpdrv | xdpoffload }\n"
@@ -470,8 +470,8 @@ static int do_help(int argc, char **argv)
 		"      For progs attached to cgroups, use \"bpftool cgroup\"\n"
 		"      to dump program attachments. For program types\n"
 		"      sk_{filter,skb,msg,reuseport} and lwt/seg6, please\n"
-		"      consult iproute2.\n",
-		bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
+		"      consult iproute2.\n"
+		"",
 		bin_name, argv[-2]);
 
 	return 0;

tools/bpf/bpftool/perf.c

@@ -231,7 +231,7 @@ static int do_show(int argc, char **argv)
 static int do_help(int argc, char **argv)
 {
 	fprintf(stderr,
-		"Usage: %s %s { show | list | help }\n"
+		"Usage: %1$s %2$s { show | list | help }\n"
 		"",
 		bin_name, argv[-2]);
 

tools/bpf/bpftool/prog.c

@@ -1984,24 +1984,24 @@ static int do_help(int argc, char **argv)
 	}
 
 	fprintf(stderr,
-		"Usage: %s %s { show | list } [PROG]\n"
-		"       %s %s dump xlated PROG [{ file FILE | opcodes | visual | linum }]\n"
-		"       %s %s dump jited  PROG [{ file FILE | opcodes | linum }]\n"
-		"       %s %s pin   PROG FILE\n"
-		"       %s %s { load | loadall } OBJ  PATH \\\n"
+		"Usage: %1$s %2$s { show | list } [PROG]\n"
+		"       %1$s %2$s dump xlated PROG [{ file FILE | opcodes | visual | linum }]\n"
+		"       %1$s %2$s dump jited  PROG [{ file FILE | opcodes | linum }]\n"
+		"       %1$s %2$s pin   PROG FILE\n"
+		"       %1$s %2$s { load | loadall } OBJ  PATH \\\n"
 		"                         [type TYPE] [dev NAME] \\\n"
 		"                         [map { idx IDX | name NAME } MAP]\\\n"
 		"                         [pinmaps MAP_DIR]\n"
-		"       %s %s attach PROG ATTACH_TYPE [MAP]\n"
-		"       %s %s detach PROG ATTACH_TYPE [MAP]\n"
-		"       %s %s run PROG \\\n"
+		"       %1$s %2$s attach PROG ATTACH_TYPE [MAP]\n"
+		"       %1$s %2$s detach PROG ATTACH_TYPE [MAP]\n"
+		"       %1$s %2$s run PROG \\\n"
 		"                         data_in FILE \\\n"
 		"                         [data_out FILE [data_size_out L]] \\\n"
 		"                         [ctx_in FILE [ctx_out FILE [ctx_size_out M]]] \\\n"
 		"                         [repeat N]\n"
-		"       %s %s profile PROG [duration DURATION] METRICs\n"
-		"       %s %s tracelog\n"
-		"       %s %s help\n"
+		"       %1$s %2$s profile PROG [duration DURATION] METRICs\n"
+		"       %1$s %2$s tracelog\n"
+		"       %1$s %2$s help\n"
 		"\n"
 		"       " HELP_SPEC_MAP "\n"
 		"       " HELP_SPEC_PROGRAM "\n"
@@ -2022,10 +2022,7 @@ static int do_help(int argc, char **argv)
 		"       METRIC := { cycles | instructions | l1d_loads | llc_misses }\n"
 		"       " HELP_SPEC_OPTIONS "\n"
 		"",
-		bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
-		bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
-		bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
-		bin_name, argv[-2], bin_name, argv[-2]);
+		bin_name, argv[-2]);
 
 	return 0;
 }

tools/bpf/bpftool/struct_ops.c

@@ -566,16 +566,15 @@ static int do_help(int argc, char **argv)
 	}
 
 	fprintf(stderr,
-		"Usage: %s %s { show | list } [STRUCT_OPS_MAP]\n"
-		"       %s %s dump [STRUCT_OPS_MAP]\n"
-		"       %s %s register OBJ\n"
-		"       %s %s unregister STRUCT_OPS_MAP\n"
-		"       %s %s help\n"
+		"Usage: %1$s %2$s { show | list } [STRUCT_OPS_MAP]\n"
+		"       %1$s %2$s dump [STRUCT_OPS_MAP]\n"
+		"       %1$s %2$s register OBJ\n"
+		"       %1$s %2$s unregister STRUCT_OPS_MAP\n"
+		"       %1$s %2$s help\n"
 		"\n"
 		"       OPTIONS := { {-j|--json} [{-p|--pretty}] }\n"
-		"       STRUCT_OPS_MAP := [ id STRUCT_OPS_MAP_ID | name STRUCT_OPS_MAP_NAME ]\n",
-		bin_name, argv[-2], bin_name, argv[-2],
-		bin_name, argv[-2], bin_name, argv[-2],
+		"       STRUCT_OPS_MAP := [ id STRUCT_OPS_MAP_ID | name STRUCT_OPS_MAP_NAME ]\n"
+		"",
 		bin_name, argv[-2]);
 
 	return 0;