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authorRameez Rehman <rameezrehman408@hotmail.com>2024-03-31 21:03:44 +0100
committerDaniel Borkmann <daniel@iogearbox.net>2024-04-02 15:50:23 +0200
commitf7b68543642136164ce7348945d3ada707c4e635 (patch)
tree2505ca965a9fed991aacf0086b220d3d41d15825 /tools/bpf
parent623bdd58be3727318d374f0052f9dfff1e87b854 (diff)
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bpftool: Use simpler indentation in source rST for documentation
The rST manual pages for bpftool would use a mix of tabs and spaces for indentation. While this is the norm in C code, this is rather unusual for rST documents, and over time we've seen many contributors use a wrong level of indentation for documentation update. Let's fix bpftool's indentation in docs once and for all: - Let's use spaces, that are more common in rST files. - Remove one level of indentation for the synopsis, the command description, and the "see also" section. As a result, all sections start with the same indentation level in the generated man page. - Rewrap the paragraphs after the changes. There is no content change in this patch, only indentation and rewrapping changes. The wrapping in the generated source files for the manual pages is changed, but the pages displayed with "man" remain the same, apart from the adjusted indentation level on relevant sections. [ Quentin: rebased on bpf-next, removed indent level for command description and options, updated synopsis, command summary, and "see also" sections. ] Signed-off-by: Rameez Rehman <rameezrehman408@hotmail.com> Signed-off-by: Quentin Monnet <qmo@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20240331200346.29118-2-qmo@kernel.org
Diffstat (limited to 'tools/bpf')
-rw-r--r--tools/bpf/bpftool/Documentation/Makefile6
-rw-r--r--tools/bpf/bpftool/Documentation/bpftool-btf.rst104
-rw-r--r--tools/bpf/bpftool/Documentation/bpftool-cgroup.rst224
-rw-r--r--tools/bpf/bpftool/Documentation/bpftool-feature.rst115
-rw-r--r--tools/bpf/bpftool/Documentation/bpftool-gen.rst338
-rw-r--r--tools/bpf/bpftool/Documentation/bpftool-iter.rst58
-rw-r--r--tools/bpf/bpftool/Documentation/bpftool-link.rst73
-rw-r--r--tools/bpf/bpftool/Documentation/bpftool-map.rst232
-rw-r--r--tools/bpf/bpftool/Documentation/bpftool-net.rst112
-rw-r--r--tools/bpf/bpftool/Documentation/bpftool-perf.rst34
-rw-r--r--tools/bpf/bpftool/Documentation/bpftool-prog.rst436
-rw-r--r--tools/bpf/bpftool/Documentation/bpftool-struct_ops.rst81
-rw-r--r--tools/bpf/bpftool/Documentation/bpftool.rst60
-rw-r--r--tools/bpf/bpftool/Documentation/common_options.rst26
14 files changed, 908 insertions, 991 deletions
diff --git a/tools/bpf/bpftool/Documentation/Makefile b/tools/bpf/bpftool/Documentation/Makefile
index ac8487dcff1d..4315652678b9 100644
--- a/tools/bpf/bpftool/Documentation/Makefile
+++ b/tools/bpf/bpftool/Documentation/Makefile
@@ -31,9 +31,9 @@ see_also = $(subst " ",, \
"\n" \
"SEE ALSO\n" \
"========\n" \
- "\t**bpf**\ (2),\n" \
- "\t**bpf-helpers**\\ (7)" \
- $(foreach page,$(call list_pages,$(1)),",\n\t**$(page)**\\ (8)") \
+ "**bpf**\ (2),\n" \
+ "**bpf-helpers**\\ (7)" \
+ $(foreach page,$(call list_pages,$(1)),",\n**$(page)**\\ (8)") \
"\n")
$(OUTPUT)%.8: %.rst
diff --git a/tools/bpf/bpftool/Documentation/bpftool-btf.rst b/tools/bpf/bpftool/Documentation/bpftool-btf.rst
index 342716f74ec4..1be6b9aae053 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-btf.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-btf.rst
@@ -14,82 +14,76 @@ tool for inspection of BTF data
SYNOPSIS
========
- **bpftool** [*OPTIONS*] **btf** *COMMAND*
+**bpftool** [*OPTIONS*] **btf** *COMMAND*
- *OPTIONS* := { |COMMON_OPTIONS| | { **-B** | **--base-btf** } }
+*OPTIONS* := { |COMMON_OPTIONS| | { **-B** | **--base-btf** } }
- *COMMANDS* := { **dump** | **help** }
+*COMMANDS* := { **dump** | **help** }
BTF COMMANDS
=============
-| **bpftool** **btf** { **show** | **list** } [**id** *BTF_ID*]
-| **bpftool** **btf dump** *BTF_SRC* [**format** *FORMAT*]
-| **bpftool** **btf help**
+| **bpftool** **btf** { **show** | **list** } [**id** *BTF_ID*]
+| **bpftool** **btf dump** *BTF_SRC* [**format** *FORMAT*]
+| **bpftool** **btf help**
|
-| *BTF_SRC* := { **id** *BTF_ID* | **prog** *PROG* | **map** *MAP* [{**key** | **value** | **kv** | **all**}] | **file** *FILE* }
-| *FORMAT* := { **raw** | **c** }
-| *MAP* := { **id** *MAP_ID* | **pinned** *FILE* }
-| *PROG* := { **id** *PROG_ID* | **pinned** *FILE* | **tag** *PROG_TAG* }
+| *BTF_SRC* := { **id** *BTF_ID* | **prog** *PROG* | **map** *MAP* [{**key** | **value** | **kv** | **all**}] | **file** *FILE* }
+| *FORMAT* := { **raw** | **c** }
+| *MAP* := { **id** *MAP_ID* | **pinned** *FILE* }
+| *PROG* := { **id** *PROG_ID* | **pinned** *FILE* | **tag** *PROG_TAG* }
DESCRIPTION
===========
- **bpftool btf { show | list }** [**id** *BTF_ID*]
- Show information about loaded BTF objects. If a BTF ID is
- specified, show information only about given BTF object,
- otherwise list all BTF objects currently loaded on the
- system.
+**bpftool btf { show | list }** [**id** *BTF_ID*]
+ Show information about loaded BTF objects. If a BTF ID is specified, show
+ information only about given BTF object, otherwise list all BTF objects
+ currently loaded on the system.
- Since Linux 5.8 bpftool is able to discover information about
- processes that hold open file descriptors (FDs) against BTF
- objects. On such kernels bpftool will automatically emit this
- information as well.
+ Since Linux 5.8 bpftool is able to discover information about processes
+ that hold open file descriptors (FDs) against BTF objects. On such kernels
+ bpftool will automatically emit this information as well.
- **bpftool btf dump** *BTF_SRC*
- Dump BTF entries from a given *BTF_SRC*.
+**bpftool btf dump** *BTF_SRC*
+ Dump BTF entries from a given *BTF_SRC*.
- When **id** is specified, BTF object with that ID will be
- loaded and all its BTF types emitted.
+ When **id** is specified, BTF object with that ID will be loaded and all
+ its BTF types emitted.
- When **map** is provided, it's expected that map has
- associated BTF object with BTF types describing key and
- value. It's possible to select whether to dump only BTF
- type(s) associated with key (**key**), value (**value**),
- both key and value (**kv**), or all BTF types present in
- associated BTF object (**all**). If not specified, **kv**
- is assumed.
+ When **map** is provided, it's expected that map has associated BTF object
+ with BTF types describing key and value. It's possible to select whether to
+ dump only BTF type(s) associated with key (**key**), value (**value**),
+ both key and value (**kv**), or all BTF types present in associated BTF
+ object (**all**). If not specified, **kv** is assumed.
- When **prog** is provided, it's expected that program has
- associated BTF object with BTF types.
+ When **prog** is provided, it's expected that program has associated BTF
+ object with BTF types.
- When specifying *FILE*, an ELF file is expected, containing
- .BTF section with well-defined BTF binary format data,
- typically produced by clang or pahole.
+ When specifying *FILE*, an ELF file is expected, containing .BTF section
+ with well-defined BTF binary format data, typically produced by clang or
+ pahole.
- **format** option can be used to override default (raw)
- output format. Raw (**raw**) or C-syntax (**c**) output
- formats are supported.
+ **format** option can be used to override default (raw) output format. Raw
+ (**raw**) or C-syntax (**c**) output formats are supported.
- **bpftool btf help**
- Print short help message.
+**bpftool btf help**
+ Print short help message.
OPTIONS
=======
- .. include:: common_options.rst
-
- -B, --base-btf *FILE*
- Pass a base BTF object. Base BTF objects are typically used
- with BTF objects for kernel modules. To avoid duplicating
- all kernel symbols required by modules, BTF objects for
- modules are "split", they are built incrementally on top of
- the kernel (vmlinux) BTF object. So the base BTF reference
- should usually point to the kernel BTF.
-
- When the main BTF object to process (for example, the
- module BTF to dump) is passed as a *FILE*, bpftool attempts
- to autodetect the path for the base object, and passing
- this option is optional. When the main BTF object is passed
- through other handles, this option becomes necessary.
+.. include:: common_options.rst
+
+-B, --base-btf *FILE*
+ Pass a base BTF object. Base BTF objects are typically used with BTF
+ objects for kernel modules. To avoid duplicating all kernel symbols
+ required by modules, BTF objects for modules are "split", they are
+ built incrementally on top of the kernel (vmlinux) BTF object. So the
+ base BTF reference should usually point to the kernel BTF.
+
+ When the main BTF object to process (for example, the module BTF to
+ dump) is passed as a *FILE*, bpftool attempts to autodetect the path
+ for the base object, and passing this option is optional. When the main
+ BTF object is passed through other handles, this option becomes
+ necessary.
EXAMPLES
========
diff --git a/tools/bpf/bpftool/Documentation/bpftool-cgroup.rst b/tools/bpf/bpftool/Documentation/bpftool-cgroup.rst
index 2ce900f66d6e..1dbabe33e56a 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-cgroup.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-cgroup.rst
@@ -14,134 +14,130 @@ tool for inspection and simple manipulation of eBPF progs
SYNOPSIS
========
- **bpftool** [*OPTIONS*] **cgroup** *COMMAND*
+**bpftool** [*OPTIONS*] **cgroup** *COMMAND*
- *OPTIONS* := { |COMMON_OPTIONS| | { **-f** | **--bpffs** } }
+*OPTIONS* := { |COMMON_OPTIONS| | { **-f** | **--bpffs** } }
- *COMMANDS* :=
- { **show** | **list** | **tree** | **attach** | **detach** | **help** }
+*COMMANDS* :=
+{ **show** | **list** | **tree** | **attach** | **detach** | **help** }
CGROUP COMMANDS
===============
-| **bpftool** **cgroup** { **show** | **list** } *CGROUP* [**effective**]
-| **bpftool** **cgroup tree** [*CGROUP_ROOT*] [**effective**]
-| **bpftool** **cgroup attach** *CGROUP* *ATTACH_TYPE* *PROG* [*ATTACH_FLAGS*]
-| **bpftool** **cgroup detach** *CGROUP* *ATTACH_TYPE* *PROG*
-| **bpftool** **cgroup help**
+| **bpftool** **cgroup** { **show** | **list** } *CGROUP* [**effective**]
+| **bpftool** **cgroup tree** [*CGROUP_ROOT*] [**effective**]
+| **bpftool** **cgroup attach** *CGROUP* *ATTACH_TYPE* *PROG* [*ATTACH_FLAGS*]
+| **bpftool** **cgroup detach** *CGROUP* *ATTACH_TYPE* *PROG*
+| **bpftool** **cgroup help**
|
-| *PROG* := { **id** *PROG_ID* | **pinned** *FILE* | **tag** *PROG_TAG* }
-| *ATTACH_TYPE* := { **cgroup_inet_ingress** | **cgroup_inet_egress** |
-| **cgroup_inet_sock_create** | **cgroup_sock_ops** |
-| **cgroup_device** | **cgroup_inet4_bind** | **cgroup_inet6_bind** |
-| **cgroup_inet4_post_bind** | **cgroup_inet6_post_bind** |
-| **cgroup_inet4_connect** | **cgroup_inet6_connect** |
-| **cgroup_unix_connect** | **cgroup_inet4_getpeername** |
-| **cgroup_inet6_getpeername** | **cgroup_unix_getpeername** |
-| **cgroup_inet4_getsockname** | **cgroup_inet6_getsockname** |
-| **cgroup_unix_getsockname** | **cgroup_udp4_sendmsg** |
-| **cgroup_udp6_sendmsg** | **cgroup_unix_sendmsg** |
-| **cgroup_udp4_recvmsg** | **cgroup_udp6_recvmsg** |
-| **cgroup_unix_recvmsg** | **cgroup_sysctl** |
-| **cgroup_getsockopt** | **cgroup_setsockopt** |
-| **cgroup_inet_sock_release** }
-| *ATTACH_FLAGS* := { **multi** | **override** }
+| *PROG* := { **id** *PROG_ID* | **pinned** *FILE* | **tag** *PROG_TAG* }
+| *ATTACH_TYPE* := { **cgroup_inet_ingress** | **cgroup_inet_egress** |
+| **cgroup_inet_sock_create** | **cgroup_sock_ops** |
+| **cgroup_device** | **cgroup_inet4_bind** | **cgroup_inet6_bind** |
+| **cgroup_inet4_post_bind** | **cgroup_inet6_post_bind** |
+| **cgroup_inet4_connect** | **cgroup_inet6_connect** |
+| **cgroup_unix_connect** | **cgroup_inet4_getpeername** |
+| **cgroup_inet6_getpeername** | **cgroup_unix_getpeername** |
+| **cgroup_inet4_getsockname** | **cgroup_inet6_getsockname** |
+| **cgroup_unix_getsockname** | **cgroup_udp4_sendmsg** |
+| **cgroup_udp6_sendmsg** | **cgroup_unix_sendmsg** |
+| **cgroup_udp4_recvmsg** | **cgroup_udp6_recvmsg** |
+| **cgroup_unix_recvmsg** | **cgroup_sysctl** |
+| **cgroup_getsockopt** | **cgroup_setsockopt** |
+| **cgroup_inet_sock_release** }
+| *ATTACH_FLAGS* := { **multi** | **override** }
DESCRIPTION
===========
- **bpftool cgroup { show | list }** *CGROUP* [**effective**]
- List all programs attached to the cgroup *CGROUP*.
-
- Output will start with program ID followed by attach type,
- attach flags and program name.
-
- If **effective** is specified retrieve effective programs that
- will execute for events within a cgroup. This includes
- inherited along with attached ones.
-
- **bpftool cgroup tree** [*CGROUP_ROOT*] [**effective**]
- Iterate over all cgroups in *CGROUP_ROOT* and list all
- attached programs. If *CGROUP_ROOT* is not specified,
- bpftool uses cgroup v2 mountpoint.
-
- The output is similar to the output of cgroup show/list
- commands: it starts with absolute cgroup path, followed by
- program ID, attach type, attach flags and program name.
-
- If **effective** is specified retrieve effective programs that
- will execute for events within a cgroup. This includes
- inherited along with attached ones.
-
- **bpftool cgroup attach** *CGROUP* *ATTACH_TYPE* *PROG* [*ATTACH_FLAGS*]
- Attach program *PROG* to the cgroup *CGROUP* with attach type
- *ATTACH_TYPE* and optional *ATTACH_FLAGS*.
-
- *ATTACH_FLAGS* can be one of: **override** if a sub-cgroup installs
- some bpf program, the program in this cgroup yields to sub-cgroup
- program; **multi** if a sub-cgroup installs some bpf program,
- that cgroup program gets run in addition to the program in this
- cgroup.
-
- Only one program is allowed to be attached to a cgroup with
- no attach flags or the **override** flag. Attaching another
- program will release old program and attach the new one.
-
- Multiple programs are allowed to be attached to a cgroup with
- **multi**. They are executed in FIFO order (those that were
- attached first, run first).
-
- Non-default *ATTACH_FLAGS* are supported by kernel version 4.14
- and later.
-
- *ATTACH_TYPE* can be on of:
- **ingress** ingress path of the inet socket (since 4.10);
- **egress** egress path of the inet socket (since 4.10);
- **sock_create** opening of an inet socket (since 4.10);
- **sock_ops** various socket operations (since 4.12);
- **device** device access (since 4.15);
- **bind4** call to bind(2) for an inet4 socket (since 4.17);
- **bind6** call to bind(2) for an inet6 socket (since 4.17);
- **post_bind4** return from bind(2) for an inet4 socket (since 4.17);
- **post_bind6** return from bind(2) for an inet6 socket (since 4.17);
- **connect4** call to connect(2) for an inet4 socket (since 4.17);
- **connect6** call to connect(2) for an inet6 socket (since 4.17);
- **connect_unix** call to connect(2) for a unix socket (since 6.7);
- **sendmsg4** call to sendto(2), sendmsg(2), sendmmsg(2) for an
- unconnected udp4 socket (since 4.18);
- **sendmsg6** call to sendto(2), sendmsg(2), sendmmsg(2) for an
- unconnected udp6 socket (since 4.18);
- **sendmsg_unix** call to sendto(2), sendmsg(2), sendmmsg(2) for
- an unconnected unix socket (since 6.7);
- **recvmsg4** call to recvfrom(2), recvmsg(2), recvmmsg(2) for
- an unconnected udp4 socket (since 5.2);
- **recvmsg6** call to recvfrom(2), recvmsg(2), recvmmsg(2) for
- an unconnected udp6 socket (since 5.2);
- **recvmsg_unix** call to recvfrom(2), recvmsg(2), recvmmsg(2) for
- an unconnected unix socket (since 6.7);
- **sysctl** sysctl access (since 5.2);
- **getsockopt** call to getsockopt (since 5.3);
- **setsockopt** call to setsockopt (since 5.3);
- **getpeername4** call to getpeername(2) for an inet4 socket (since 5.8);
- **getpeername6** call to getpeername(2) for an inet6 socket (since 5.8);
- **getpeername_unix** call to getpeername(2) for a unix socket (since 6.7);
- **getsockname4** call to getsockname(2) for an inet4 socket (since 5.8);
- **getsockname6** call to getsockname(2) for an inet6 socket (since 5.8).
- **getsockname_unix** call to getsockname(2) for a unix socket (since 6.7);
- **sock_release** closing an userspace inet socket (since 5.9).
-
- **bpftool cgroup detach** *CGROUP* *ATTACH_TYPE* *PROG*
- Detach *PROG* from the cgroup *CGROUP* and attach type
- *ATTACH_TYPE*.
-
- **bpftool prog help**
- Print short help message.
+**bpftool cgroup { show | list }** *CGROUP* [**effective**]
+ List all programs attached to the cgroup *CGROUP*.
+
+ Output will start with program ID followed by attach type, attach flags and
+ program name.
+
+ If **effective** is specified retrieve effective programs that will execute
+ for events within a cgroup. This includes inherited along with attached
+ ones.
+
+**bpftool cgroup tree** [*CGROUP_ROOT*] [**effective**]
+ Iterate over all cgroups in *CGROUP_ROOT* and list all attached programs.
+ If *CGROUP_ROOT* is not specified, bpftool uses cgroup v2 mountpoint.
+
+ The output is similar to the output of cgroup show/list commands: it starts
+ with absolute cgroup path, followed by program ID, attach type, attach
+ flags and program name.
+
+ If **effective** is specified retrieve effective programs that will execute
+ for events within a cgroup. This includes inherited along with attached
+ ones.
+
+**bpftool cgroup attach** *CGROUP* *ATTACH_TYPE* *PROG* [*ATTACH_FLAGS*]
+ Attach program *PROG* to the cgroup *CGROUP* with attach type *ATTACH_TYPE*
+ and optional *ATTACH_FLAGS*.
+
+ *ATTACH_FLAGS* can be one of: **override** if a sub-cgroup installs some
+ bpf program, the program in this cgroup yields to sub-cgroup program;
+ **multi** if a sub-cgroup installs some bpf program, that cgroup program
+ gets run in addition to the program in this cgroup.
+
+ Only one program is allowed to be attached to a cgroup with no attach flags
+ or the **override** flag. Attaching another program will release old
+ program and attach the new one.
+
+ Multiple programs are allowed to be attached to a cgroup with **multi**.
+ They are executed in FIFO order (those that were attached first, run
+ first).
+
+ Non-default *ATTACH_FLAGS* are supported by kernel version 4.14 and later.
+
+ *ATTACH_TYPE* can be on of:
+ **ingress** ingress path of the inet socket (since 4.10);
+ **egress** egress path of the inet socket (since 4.10);
+ **sock_create** opening of an inet socket (since 4.10);
+ **sock_ops** various socket operations (since 4.12);
+ **device** device access (since 4.15);
+ **bind4** call to bind(2) for an inet4 socket (since 4.17);
+ **bind6** call to bind(2) for an inet6 socket (since 4.17);
+ **post_bind4** return from bind(2) for an inet4 socket (since 4.17);
+ **post_bind6** return from bind(2) for an inet6 socket (since 4.17);
+ **connect4** call to connect(2) for an inet4 socket (since 4.17);
+ **connect6** call to connect(2) for an inet6 socket (since 4.17);
+ **connect_unix** call to connect(2) for a unix socket (since 6.7);
+ **sendmsg4** call to sendto(2), sendmsg(2), sendmmsg(2) for an unconnected
+ udp4 socket (since 4.18);
+ **sendmsg6** call to sendto(2), sendmsg(2), sendmmsg(2) for an unconnected
+ udp6 socket (since 4.18);
+ **sendmsg_unix** call to sendto(2), sendmsg(2), sendmmsg(2) for an
+ unconnected unix socket (since 6.7);
+ **recvmsg4** call to recvfrom(2), recvmsg(2), recvmmsg(2) for an
+ unconnected udp4 socket (since 5.2);
+ **recvmsg6** call to recvfrom(2), recvmsg(2), recvmmsg(2) for an
+ unconnected udp6 socket (since 5.2);
+ **recvmsg_unix** call to recvfrom(2), recvmsg(2), recvmmsg(2) for an
+ unconnected unix socket (since 6.7);
+ **sysctl** sysctl access (since 5.2);
+ **getsockopt** call to getsockopt (since 5.3);
+ **setsockopt** call to setsockopt (since 5.3);
+ **getpeername4** call to getpeername(2) for an inet4 socket (since 5.8);
+ **getpeername6** call to getpeername(2) for an inet6 socket (since 5.8);
+ **getpeername_unix** call to getpeername(2) for a unix socket (since 6.7);
+ **getsockname4** call to getsockname(2) for an inet4 socket (since 5.8);
+ **getsockname6** call to getsockname(2) for an inet6 socket (since 5.8).
+ **getsockname_unix** call to getsockname(2) for a unix socket (since 6.7);
+ **sock_release** closing an userspace inet socket (since 5.9).
+
+**bpftool cgroup detach** *CGROUP* *ATTACH_TYPE* *PROG*
+ Detach *PROG* from the cgroup *CGROUP* and attach type *ATTACH_TYPE*.
+
+**bpftool prog help**
+ Print short help message.
OPTIONS
=======
- .. include:: common_options.rst
+.. include:: common_options.rst
- -f, --bpffs
- Show file names of pinned programs.
+-f, --bpffs
+ Show file names of pinned programs.
EXAMPLES
========
diff --git a/tools/bpf/bpftool/Documentation/bpftool-feature.rst b/tools/bpf/bpftool/Documentation/bpftool-feature.rst
index e44039f89be7..5c2433147ba4 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-feature.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-feature.rst
@@ -14,77 +14,70 @@ tool for inspection of eBPF-related parameters for Linux kernel or net device
SYNOPSIS
========
- **bpftool** [*OPTIONS*] **feature** *COMMAND*
+**bpftool** [*OPTIONS*] **feature** *COMMAND*
- *OPTIONS* := { |COMMON_OPTIONS| }
+*OPTIONS* := { |COMMON_OPTIONS| }
- *COMMANDS* := { **probe** | **help** }
+*COMMANDS* := { **probe** | **help** }
FEATURE COMMANDS
================
-| **bpftool** **feature probe** [*COMPONENT*] [**full**] [**unprivileged**] [**macros** [**prefix** *PREFIX*]]
-| **bpftool** **feature list_builtins** *GROUP*
-| **bpftool** **feature help**
+| **bpftool** **feature probe** [*COMPONENT*] [**full**] [**unprivileged**] [**macros** [**prefix** *PREFIX*]]
+| **bpftool** **feature list_builtins** *GROUP*
+| **bpftool** **feature help**
|
-| *COMPONENT* := { **kernel** | **dev** *NAME* }
-| *GROUP* := { **prog_types** | **map_types** | **attach_types** | **link_types** | **helpers** }
+| *COMPONENT* := { **kernel** | **dev** *NAME* }
+| *GROUP* := { **prog_types** | **map_types** | **attach_types** | **link_types** | **helpers** }
DESCRIPTION
===========
- **bpftool feature probe** [**kernel**] [**full**] [**macros** [**prefix** *PREFIX*]]
- Probe the running kernel and dump a number of eBPF-related
- parameters, such as availability of the **bpf**\ () system call,
- JIT status, eBPF program types availability, eBPF helper
- functions availability, and more.
-
- By default, bpftool **does not run probes** for
- **bpf_probe_write_user**\ () and **bpf_trace_printk**\()
- helpers which print warnings to kernel logs. To enable them
- and run all probes, the **full** keyword should be used.
-
- If the **macros** keyword (but not the **-j** option) is
- passed, a subset of the output is dumped as a list of
- **#define** macros that are ready to be included in a C
- header file, for example. If, additionally, **prefix** is
- used to define a *PREFIX*, the provided string will be used
- as a prefix to the names of the macros: this can be used to
- avoid conflicts on macro names when including the output of
- this command as a header file.
-
- Keyword **kernel** can be omitted. If no probe target is
- specified, probing the kernel is the default behaviour.
-
- When the **unprivileged** keyword is used, bpftool will dump
- only the features available to a user who does not have the
- **CAP_SYS_ADMIN** capability set. The features available in
- that case usually represent a small subset of the parameters
- supported by the system. Unprivileged users MUST use the
- **unprivileged** keyword: This is to avoid misdetection if
- bpftool is inadvertently run as non-root, for example. This
- keyword is unavailable if bpftool was compiled without
- libcap.
-
- **bpftool feature probe dev** *NAME* [**full**] [**macros** [**prefix** *PREFIX*]]
- Probe network device for supported eBPF features and dump
- results to the console.
-
- The keywords **full**, **macros** and **prefix** have the
- same role as when probing the kernel.
-
- **bpftool feature list_builtins** *GROUP*
- List items known to bpftool. These can be BPF program types
- (**prog_types**), BPF map types (**map_types**), attach types
- (**attach_types**), link types (**link_types**), or BPF helper
- functions (**helpers**). The command does not probe the system, but
- simply lists the elements that bpftool knows from compilation time,
- as provided from libbpf (for all object types) or from the BPF UAPI
- header (list of helpers). This can be used in scripts to iterate over
- BPF types or helpers.
-
- **bpftool feature help**
- Print short help message.
+**bpftool feature probe** [**kernel**] [**full**] [**macros** [**prefix** *PREFIX*]]
+ Probe the running kernel and dump a number of eBPF-related parameters, such
+ as availability of the **bpf**\ () system call, JIT status, eBPF program
+ types availability, eBPF helper functions availability, and more.
+
+ By default, bpftool **does not run probes** for **bpf_probe_write_user**\
+ () and **bpf_trace_printk**\() helpers which print warnings to kernel logs.
+ To enable them and run all probes, the **full** keyword should be used.
+
+ If the **macros** keyword (but not the **-j** option) is passed, a subset
+ of the output is dumped as a list of **#define** macros that are ready to
+ be included in a C header file, for example. If, additionally, **prefix**
+ is used to define a *PREFIX*, the provided string will be used as a prefix
+ to the names of the macros: this can be used to avoid conflicts on macro
+ names when including the output of this command as a header file.
+
+ Keyword **kernel** can be omitted. If no probe target is specified, probing
+ the kernel is the default behaviour.
+
+ When the **unprivileged** keyword is used, bpftool will dump only the
+ features available to a user who does not have the **CAP_SYS_ADMIN**
+ capability set. The features available in that case usually represent a
+ small subset of the parameters supported by the system. Unprivileged users
+ MUST use the **unprivileged** keyword: This is to avoid misdetection if
+ bpftool is inadvertently run as non-root, for example. This keyword is
+ unavailable if bpftool was compiled without libcap.
+
+**bpftool feature probe dev** *NAME* [**full**] [**macros** [**prefix** *PREFIX*]]
+ Probe network device for supported eBPF features and dump results to the
+ console.
+
+ The keywords **full**, **macros** and **prefix** have the same role as when
+ probing the kernel.
+
+**bpftool feature list_builtins** *GROUP*
+ List items known to bpftool. These can be BPF program types
+ (**prog_types**), BPF map types (**map_types**), attach types
+ (**attach_types**), link types (**link_types**), or BPF helper functions
+ (**helpers**). The command does not probe the system, but simply lists the
+ elements that bpftool knows from compilation time, as provided from libbpf
+ (for all object types) or from the BPF UAPI header (list of helpers). This
+ can be used in scripts to iterate over BPF types or helpers.
+
+**bpftool feature help**
+ Print short help message.
OPTIONS
=======
- .. include:: common_options.rst
+.. include:: common_options.rst
diff --git a/tools/bpf/bpftool/Documentation/bpftool-gen.rst b/tools/bpf/bpftool/Documentation/bpftool-gen.rst
index 5e60825818dd..68104347d592 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-gen.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-gen.rst
@@ -14,199 +14,177 @@ tool for BPF code-generation
SYNOPSIS
========
- **bpftool** [*OPTIONS*] **gen** *COMMAND*
+**bpftool** [*OPTIONS*] **gen** *COMMAND*
- *OPTIONS* := { |COMMON_OPTIONS| | { **-L** | **--use-loader** } }
+*OPTIONS* := { |COMMON_OPTIONS| | { **-L** | **--use-loader** } }
- *COMMAND* := { **object** | **skeleton** | **help** }
+*COMMAND* := { **object** | **skeleton** | **help** }
GEN COMMANDS
=============
-| **bpftool** **gen object** *OUTPUT_FILE* *INPUT_FILE* [*INPUT_FILE*...]
-| **bpftool** **gen skeleton** *FILE* [**name** *OBJECT_NAME*]
-| **bpftool** **gen subskeleton** *FILE* [**name** *OBJECT_NAME*]
-| **bpftool** **gen min_core_btf** *INPUT* *OUTPUT* *OBJECT* [*OBJECT*...]
-| **bpftool** **gen help**
+| **bpftool** **gen object** *OUTPUT_FILE* *INPUT_FILE* [*INPUT_FILE*...]
+| **bpftool** **gen skeleton** *FILE* [**name** *OBJECT_NAME*]
+| **bpftool** **gen subskeleton** *FILE* [**name** *OBJECT_NAME*]
+| **bpftool** **gen min_core_btf** *INPUT* *OUTPUT* *OBJECT* [*OBJECT*...]
+| **bpftool** **gen help**
DESCRIPTION
===========
- **bpftool gen object** *OUTPUT_FILE* *INPUT_FILE* [*INPUT_FILE*...]
- Statically link (combine) together one or more *INPUT_FILE*'s
- into a single resulting *OUTPUT_FILE*. All the files involved
- are BPF ELF object files.
-
- The rules of BPF static linking are mostly the same as for
- user-space object files, but in addition to combining data
- and instruction sections, .BTF and .BTF.ext (if present in
- any of the input files) data are combined together. .BTF
- data is deduplicated, so all the common types across
- *INPUT_FILE*'s will only be represented once in the resulting
- BTF information.
-
- BPF static linking allows to partition BPF source code into
- individually compiled files that are then linked into
- a single resulting BPF object file, which can be used to
- generated BPF skeleton (with **gen skeleton** command) or
- passed directly into **libbpf** (using **bpf_object__open()**
- family of APIs).
-
- **bpftool gen skeleton** *FILE*
- Generate BPF skeleton C header file for a given *FILE*.
-
- BPF skeleton is an alternative interface to existing libbpf
- APIs for working with BPF objects. Skeleton code is intended
- to significantly shorten and simplify code to load and work
- with BPF programs from userspace side. Generated code is
- tailored to specific input BPF object *FILE*, reflecting its
- structure by listing out available maps, program, variables,
- etc. Skeleton eliminates the need to lookup mentioned
- components by name. Instead, if skeleton instantiation
- succeeds, they are populated in skeleton structure as valid
- libbpf types (e.g., **struct bpf_map** pointer) and can be
- passed to existing generic libbpf APIs.
-
- In addition to simple and reliable access to maps and
- programs, skeleton provides a storage for BPF links (**struct
- bpf_link**) for each BPF program within BPF object. When
- requested, supported BPF programs will be automatically
- attached and resulting BPF links stored for further use by
- user in pre-allocated fields in skeleton struct. For BPF
- programs that can't be automatically attached by libbpf,
- user can attach them manually, but store resulting BPF link
- in per-program link field. All such set up links will be
- automatically destroyed on BPF skeleton destruction. This
- eliminates the need for users to manage links manually and
- rely on libbpf support to detach programs and free up
- resources.
-
- Another facility provided by BPF skeleton is an interface to
- global variables of all supported kinds: mutable, read-only,
- as well as extern ones. This interface allows to pre-setup
- initial values of variables before BPF object is loaded and
- verified by kernel. For non-read-only variables, the same
- interface can be used to fetch values of global variables on
- userspace side, even if they are modified by BPF code.
-
- During skeleton generation, contents of source BPF object
- *FILE* is embedded within generated code and is thus not
- necessary to keep around. This ensures skeleton and BPF
- object file are matching 1-to-1 and always stay in sync.
- Generated code is dual-licensed under LGPL-2.1 and
- BSD-2-Clause licenses.
-
- It is a design goal and guarantee that skeleton interfaces
- are interoperable with generic libbpf APIs. User should
- always be able to use skeleton API to create and load BPF
- object, and later use libbpf APIs to keep working with
- specific maps, programs, etc.
-
- As part of skeleton, few custom functions are generated.
- Each of them is prefixed with object name. Object name can
- either be derived from object file name, i.e., if BPF object
- file name is **example.o**, BPF object name will be
- **example**. Object name can be also specified explicitly
- through **name** *OBJECT_NAME* parameter. The following
- custom functions are provided (assuming **example** as
- the object name):
-
- - **example__open** and **example__open_opts**.
- These functions are used to instantiate skeleton. It
- corresponds to libbpf's **bpf_object__open**\ () API.
- **_opts** variants accepts extra **bpf_object_open_opts**
- options.
-
- - **example__load**.
- This function creates maps, loads and verifies BPF
- programs, initializes global data maps. It corresponds to
- libppf's **bpf_object__load**\ () API.
-
- - **example__open_and_load** combines **example__open** and
- **example__load** invocations in one commonly used
- operation.
-
- - **example__attach** and **example__detach**
- This pair of functions allow to attach and detach,
- correspondingly, already loaded BPF object. Only BPF
- programs of types supported by libbpf for auto-attachment
- will be auto-attached and their corresponding BPF links
- instantiated. For other BPF programs, user can manually
- create a BPF link and assign it to corresponding fields in
- skeleton struct. **example__detach** will detach both
- links created automatically, as well as those populated by
- user manually.
-
- - **example__destroy**
- Detach and unload BPF programs, free up all the resources
- used by skeleton and BPF object.
-
- If BPF object has global variables, corresponding structs
- with memory layout corresponding to global data data section
- layout will be created. Currently supported ones are: *.data*,
- *.bss*, *.rodata*, and *.kconfig* structs/data sections.
- These data sections/structs can be used to set up initial
- values of variables, if set before **example__load**.
- Afterwards, if target kernel supports memory-mapped BPF
- arrays, same structs can be used to fetch and update
- (non-read-only) data from userspace, with same simplicity
- as for BPF side.
-
- **bpftool gen subskeleton** *FILE*
- Generate BPF subskeleton C header file for a given *FILE*.
-
- Subskeletons are similar to skeletons, except they do not own
- the corresponding maps, programs, or global variables. They
- require that the object file used to generate them is already
- loaded into a *bpf_object* by some other means.
-
- This functionality is