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226 Commits

Author SHA1 Message Date
David S. Miller
ec7146db15 Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next
Daniel Borkmann says:

====================
pull-request: bpf-next 2019-01-29

The following pull-request contains BPF updates for your *net-next* tree.

The main changes are:

1) Teach verifier dead code removal, this also allows for optimizing /
   removing conditional branches around dead code and to shrink the
   resulting image. Code store constrained architectures like nfp would
   have hard time doing this at JIT level, from Jakub.

2) Add JMP32 instructions to BPF ISA in order to allow for optimizing
   code generation for 32-bit sub-registers. Evaluation shows that this
   can result in code reduction of ~5-20% compared to 64 bit-only code
   generation. Also add implementation for most JITs, from Jiong.

3) Add support for __int128 types in BTF which is also needed for
   vmlinux's BTF conversion to work, from Yonghong.

4) Add a new command to bpftool in order to dump a list of BPF-related
   parameters from the system or for a specific network device e.g. in
   terms of available prog/map types or helper functions, from Quentin.

5) Add AF_XDP sock_diag interface for querying sockets from user
   space which provides information about the RX/TX/fill/completion
   rings, umem, memory usage etc, from Björn.

6) Add skb context access for skb_shared_info->gso_segs field, from Eric.

7) Add support for testing flow dissector BPF programs by extending
   existing BPF_PROG_TEST_RUN infrastructure, from Stanislav.

8) Split BPF kselftest's test_verifier into various subgroups of tests
   in order better deal with merge conflicts in this area, from Jakub.

9) Add support for queue/stack manipulations in bpftool, from Stanislav.

10) Document BTF, from Yonghong.

11) Dump supported ELF section names in libbpf on program load
    failure, from Taeung.

12) Silence a false positive compiler warning in verifier's BTF
    handling, from Peter.

13) Fix help string in bpftool's feature probing, from Prashant.

14) Remove duplicate includes in BPF kselftests, from Yue.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2019-01-28 19:38:33 -08:00
Jakub Kicinski
d76198b0bc tools: bpftool: warn about risky prog array updates
When prog array is updated with bpftool users often refer
to the map via the ID.  Unfortunately, that's likely
to lead to confusion because prog arrays get flushed when
the last user reference is gone.  If there is no other
reference bpftool will create one, update successfully
just to close the map again and have it flushed.

Warn about this case in non-JSON mode.

If the problem continues causing confusion we can remove
the support for referring to a map by ID for prog array
update completely.  For now it seems like the potential
inconvenience to users who know what they're doing outweighs
the benefit.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-01-29 00:27:38 +01:00
Jiong Wang
df791dc167 tools: bpftool: teach cfg code about JMP32
The cfg code need to be aware of the new JMP32 instruction class so it
could partition functions correctly.

Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Jiong Wang <jiong.wang@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2019-01-26 13:33:01 -08:00
Prashant Bhole
866e6ac474 bpftool: feature probing, change default action
When 'bpftool feature' is executed it shows incorrect help string.

test# bpftool feature
Usage: bpftool bpftool probe [COMPONENT] [macros [prefix PREFIX]]
       bpftool bpftool help

       COMPONENT := { kernel | dev NAME }

Instead of fixing the help text by tweaking argv[] indices, this
patch changes the default action to 'probe'. It makes the behavior
consistent with other subcommands, where first subcommand without
extra parameter results in 'show' action.

Signed-off-by: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-01-24 10:47:52 +01:00
Taeung Song
c76e4c228b libbpf: Show supported ELF section names when failing to guess prog/attach type
We need to let users check their wrong ELF section name with proper
ELF section names when they fail to get a prog/attach type from it.
Because users can't realize libbpf guess prog/attach types from given
ELF section names. For example, when a 'cgroup' section name of a
BPF program is used, show available ELF section names(types).

Before:

    $ bpftool prog load bpf-prog.o /sys/fs/bpf/prog1
    Error: failed to guess program type based on ELF section name cgroup

After:

    libbpf: failed to guess program type based on ELF section name 'cgroup'
    libbpf: supported section(type) names are: socket kprobe/ kretprobe/ classifier action tracepoint/ raw_tracepoint/ xdp perf_event lwt_in lwt_out lwt_xmit lwt_seg6local cgroup_skb/ingress cgroup_skb/egress cgroup/skb cgroup/sock cgroup/post_bind4 cgroup/post_bind6 cgroup/dev sockops sk_skb/stream_parser sk_skb/stream_verdict sk_skb sk_msg lirc_mode2 flow_dissector cgroup/bind4 cgroup/bind6 cgroup/connect4 cgroup/connect6 cgroup/sendmsg4 cgroup/sendmsg6

Signed-off-by: Taeung Song <treeze.taeung@gmail.com>
Cc: Quentin Monnet <quentin.monnet@netronome.com>
Cc: Jakub Kicinski <jakub.kicinski@netronome.com>
Cc: Andrey Ignatov <rdna@fb.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-01-23 12:27:04 +01:00
Quentin Monnet
948703e808 tools: bpftool: add bash completion for bpftool probes
Add the bash completion related to the newly introduced "bpftool feature
probe" command.

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2019-01-22 22:15:40 -08:00
Quentin Monnet
f9499fedf2 tools: bpftool: add probes for a network device
bpftool gained support for probing the current system in order to see
what program and map types, and what helpers are available on that
system. This patch adds the possibility to pass an interface index to
libbpf (and hence to the kernel) when trying to load the programs or to
create the maps, in order to see what items a given network device can
support.

A new keyword "dev <ifname>" can be used as an alternative to "kernel"
to indicate that the given device should be tested. If no target ("dev"
or "kernel") is specified bpftool defaults to probing the kernel.

Sample output:

    # bpftool -p feature probe dev lo
    {
        "syscall_config": {
            "have_bpf_syscall": true
        },
        "program_types": {
            "have_sched_cls_prog_type": false,
            "have_xdp_prog_type": false
        },
        ...
    }

As the target is a network device, /proc/ parameters and kernel
configuration are NOT dumped. Availability of the bpf() syscall is
still probed, so we can return early if that syscall is not usable
(since there is no point in attempting the remaining probes in this
case).

Among the program types, only the ones that can be offloaded are probed.
All map types are probed, as there is no specific rule telling which one
could or could not be supported by a device in the future. All helpers
are probed (but only for offload-able program types).

Caveat: as bpftool does not attempt to attach programs to the device at
the moment, probes do not entirely reflect what the device accepts:
typically, for Netronome's nfp, results will announce that TC cls
offload is available even if support has been deactivated (with e.g.
ethtool -K eth1 hw-tc-offload off).

v2:
- All helpers are probed, whereas previous version would only probe the
  ones compatible with an offload-able program type. This is because we
  do not keep a default compatible program type for each helper anymore.

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2019-01-22 22:15:40 -08:00
Quentin Monnet
d267cff467 tools: bpftool: add C-style "#define" output for probes
Make bpftool able to dump a subset of the parameters collected by
probing the system as a listing of C-style #define macros, so that
external projects can reuse the result of this probing and build
BPF-based project in accordance with the features available on the
system.

The new "macros" keyword is used to select this output. An additional
"prefix" keyword is added so that users can select a custom prefix for
macro names, in order to avoid any namespace conflict.

Sample output:

    # bpftool feature probe kernel macros prefix FOO_
    /*** System call availability ***/
    #define FOO_HAVE_BPF_SYSCALL

    /*** eBPF program types ***/
    #define FOO_HAVE_SOCKET_FILTER_PROG_TYPE
    #define FOO_HAVE_KPROBE_PROG_TYPE
    #define FOO_HAVE_SCHED_CLS_PROG_TYPE
    ...

    /*** eBPF map types ***/
    #define FOO_HAVE_HASH_MAP_TYPE
    #define FOO_HAVE_ARRAY_MAP_TYPE
    #define FOO_HAVE_PROG_ARRAY_MAP_TYPE
    ...

    /*** eBPF helper functions ***/
    /*
     * Use FOO_HAVE_PROG_TYPE_HELPER(prog_type_name, helper_name)
     * to determine if <helper_name> is available for <prog_type_name>,
     * e.g.
     *      #if FOO_HAVE_PROG_TYPE_HELPER(xdp, bpf_redirect)
     *              // do stuff with this helper
     *      #elif
     *              // use a workaround
     *      #endif
     */
    #define FOO_HAVE_PROG_TYPE_HELPER(prog_type, helper)        \
            FOO_BPF__PROG_TYPE_ ## prog_type ## __HELPER_ ## helper
    ...
    #define FOO_BPF__PROG_TYPE_socket_filter__HELPER_bpf_probe_read 0
    #define FOO_BPF__PROG_TYPE_socket_filter__HELPER_bpf_ktime_get_ns 1
    #define FOO_BPF__PROG_TYPE_socket_filter__HELPER_bpf_trace_printk 1
    ...

v3:
- Change output for helpers again: add a
  HAVE_PROG_TYPE_HELPER(type, helper) macro that can be used to tell
  if <helper> is available for program <type>.

v2:
- #define-based output added as a distinct patch.
- "HAVE_" prefix appended to macro names.
- Output limited to bpf() syscall availability, BPF prog and map types,
  helper functions. In this version kernel config options, procfs
  parameter or kernel version are intentionally left aside.
- Following the change on helper probes, format for helper probes in
  this output style has changed (now a list of compatible program
  types).

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2019-01-22 22:15:40 -08:00
Quentin Monnet
2d3ea5e85d tools: bpftool: add probes for eBPF helper functions
Similarly to what was done for program types and map types, add a set of
probes to test the availability of the different eBPF helper functions
on the current system.

For each known program type, all known helpers are tested, in order to
establish a compatibility matrix. Output is provided as a set of lists
of available helpers, one per program type.

Sample output:

    # bpftool feature probe kernel
    ...
    Scanning eBPF helper functions...
    eBPF helpers supported for program type socket_filter:
            - bpf_map_lookup_elem
            - bpf_map_update_elem
            - bpf_map_delete_elem
    ...
    eBPF helpers supported for program type kprobe:
            - bpf_map_lookup_elem
            - bpf_map_update_elem
            - bpf_map_delete_elem
    ...

    # bpftool --json --pretty feature probe kernel
    {
        ...
        "helpers": {
            "socket_filter_available_helpers": ["bpf_map_lookup_elem", \
                    "bpf_map_update_elem","bpf_map_delete_elem", ...
            ],
            "kprobe_available_helpers": ["bpf_map_lookup_elem", \
                    "bpf_map_update_elem","bpf_map_delete_elem", ...
            ],
            ...
        }
    }

v5:
- In libbpf.map, move global symbol to the new LIBBPF_0.0.2 section.

v4:
- Use "enum bpf_func_id" instead of "__u32" in bpf_probe_helper()
  declaration for the type of the argument used to pass the id of
  the helper to probe.
- Undef BPF_HELPER_MAKE_ENTRY after using it.

v3:
- Do not pass kernel version from bpftool to libbpf probes (kernel
  version for testing program with kprobes is retrieved directly from
  libbpf).
- Dump one list of available helpers per program type (instead of one
  list of compatible program types per helper).

v2:
- Move probes from bpftool to libbpf.
- Test all program types for each helper, print a list of working prog
  types for each helper.
- Fall back on include/uapi/linux/bpf.h for names and ids of helpers.
- Remove C-style macros output from this patch.

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2019-01-22 22:15:40 -08:00
Quentin Monnet
f99e166397 tools: bpftool: add probes for eBPF map types
Add new probes for eBPF map types, to detect what are the ones available
on the system. Try creating one map of each type, and see if the kernel
complains.

Sample output:

    # bpftool feature probe kernel
    ...
    Scanning eBPF map types...
    eBPF map_type hash is available
    eBPF map_type array is available
    eBPF map_type prog_array is available
    ...

    # bpftool --json --pretty feature probe kernel
    {
        ...
        "map_types": {
            "have_hash_map_type": true,
            "have_array_map_type": true,
            "have_prog_array_map_type": true,
            ...
        }
    }

v5:
- In libbpf.map, move global symbol to the new LIBBPF_0.0.2 section.

v3:
- Use a switch with all enum values for setting specific map parameters,
  so that gcc complains at compile time (-Wswitch-enum) if new map types
  were added to the kernel but libbpf was not updated.

v2:
- Move probes from bpftool to libbpf.
- Remove C-style macros output from this patch.

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2019-01-22 22:15:40 -08:00
Quentin Monnet
1bf4b05810 tools: bpftool: add probes for eBPF program types
Introduce probes for supported BPF program types in libbpf, and call it
from bpftool to test what types are available on the system. The probe
simply consists in loading a very basic program of that type and see if
the verifier complains or not.

Sample output:

    # bpftool feature probe kernel
    ...
    Scanning eBPF program types...
    eBPF program_type socket_filter is available
    eBPF program_type kprobe is available
    eBPF program_type sched_cls is available
    ...

    # bpftool --json --pretty feature probe kernel
    {
        ...
        "program_types": {
            "have_socket_filter_prog_type": true,
            "have_kprobe_prog_type": true,
            "have_sched_cls_prog_type": true,
            ...
        }
    }

v5:
- In libbpf.map, move global symbol to a new LIBBPF_0.0.2 section.
- Rename (non-API function) prog_load() as probe_load().

v3:
- Get kernel version for checking kprobes availability from libbpf
  instead of from bpftool. Do not pass kernel_version as an argument
  when calling libbpf probes.
- Use a switch with all enum values for setting specific program
  parameters just before probing, so that gcc complains at compile time
  (-Wswitch-enum) if new prog types were added to the kernel but libbpf
  was not updated.
- Add a comment in libbpf.h about setrlimit() usage to allow many
  consecutive probe attempts.

v2:
- Move probes from bpftool to libbpf.
- Remove C-style macros output from this patch.

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2019-01-22 22:15:40 -08:00
Quentin Monnet
4567b983f7 tools: bpftool: add probes for kernel configuration options
Add probes to dump a number of options set (or not set) for compiling
the kernel image. These parameters provide information about what BPF
components should be available on the system. A number of them are not
directly related to eBPF, but are in fact used in the kernel as
conditions on which to compile, or not to compile, some of the eBPF
helper functions.

Sample output:

    # bpftool feature probe kernel
    Scanning system configuration...
    ...
    CONFIG_BPF is set to y
    CONFIG_BPF_SYSCALL is set to y
    CONFIG_HAVE_EBPF_JIT is set to y
    ...

    # bpftool --pretty --json feature probe kernel
    {
        "system_config": {
            ...
            "CONFIG_BPF": "y",
            "CONFIG_BPF_SYSCALL": "y",
            "CONFIG_HAVE_EBPF_JIT": "y",
            ...
        }
    }

v5:
- Declare options[] array in probe_kernel_image_config() as static.

v4:
- Add some options to the list:
    - CONFIG_TRACING
    - CONFIG_KPROBE_EVENTS
    - CONFIG_UPROBE_EVENTS
    - CONFIG_FTRACE_SYSCALLS
- Add comments about those options in the source code.

v3:
- Add a comment about /proc/config.gz not being supported as a path for
  the config file at this time.
- Use p_info() instead of p_err() on failure to get options from config
  file, as bpftool keeps probing other parameters and that would
  possibly create duplicate "error" entries for JSON.

v2:
- Remove C-style macros output from this patch.
- NOT addressed: grouping of those config options into subsections
  (I don't see an easy way of grouping them at the moment, please see
  also the discussion on v1 thread).

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2019-01-22 22:15:40 -08:00
Quentin Monnet
7a4522bbef tools: bpftool: add probes for /proc/ eBPF parameters
Add a set of probes to dump the eBPF-related parameters available from
/proc/: availability of bpf() syscall for unprivileged users,
JIT compiler status and hardening status, kallsyms exports status.

Sample output:

    # bpftool feature probe kernel
    Scanning system configuration...
    bpf() syscall for unprivileged users is enabled
    JIT compiler is disabled
    JIT compiler hardening is disabled
    JIT compiler kallsyms exports are disabled
    Global memory limit for JIT compiler for unprivileged users \
            is 264241152 bytes
    ...

    # bpftool --json --pretty feature probe kernel
    {
        "system_config": {
            "unprivileged_bpf_disabled": 0,
            "bpf_jit_enable": 0,
            "bpf_jit_harden": 0,
            "bpf_jit_kallsyms": 0,
            "bpf_jit_limit": 264241152
        },
        ...
    }

These probes are skipped if procfs is not mounted.

v4:
- Add bpf_jit_limit parameter.

v2:
- Remove C-style macros output from this patch.

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2019-01-22 22:15:40 -08:00
Quentin Monnet
49eb7ab3b2 tools: bpftool: add basic probe capability, probe syscall availability
Add a new component and command for bpftool, in order to probe the
system to dump a set of eBPF-related parameters so that users can know
what features are available on the system.

Parameters are dumped in plain or JSON output (with -j/-p options).

The current patch introduces probing of one simple parameter:
availability of the bpf() system call. Later commits
will add other probes.

Sample output:

    # bpftool feature probe kernel
    Scanning system call availability...
    bpf() syscall is available

    # bpftool --json --pretty feature probe kernel
    {
        "syscall_config": {
            "have_bpf_syscall": true
        }
    }

The optional "kernel" keyword enforces probing of the current system,
which is the only possible behaviour at this stage. It can be safely
omitted.

The feature comes with the relevant man page, but bash completion will
come in a dedicated commit.

v3:
- Do not probe kernel version. Contrarily to what is written below for
  v2, we can have the kernel version retrieved in libbpf instead of
  bpftool (in the patch adding probing for program types).

v2:
- Remove C-style macros output from this patch.
- Even though kernel version is no longer needed for testing kprobes
  availability, note that we still collect it in this patch so that
  bpftool gets able to probe (in next patches) older kernels as well.

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2019-01-22 22:15:40 -08:00
Thomas Gleixner
64cf548126 tools: bpftool: Cleanup license mess
Precise and non-ambiguous license information is important. The recent
relicensing of the bpftools introduced a license conflict.

The files have now:

     SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause

and

     * This program is free software; you can redistribute it and/or
     * modify it under the terms of the GNU General Public License
     * as published by the Free Software Foundation; either version
     * 2 of the License, or (at your option) any later version

Amazingly about 20 people acked that change and neither they nor the
committer noticed. Oh well.

Digging deeper: The files were imported from the iproute2 repository with
the GPL V2 or later boiler plate text in commit b66e907cfe ("tools:
bpftool: copy JSON writer from iproute2 repository")

Looking at the iproute2 repository at

  git://git.kernel.org/pub/scm/network/iproute2/iproute2.git

the following commit is the equivivalent:

  commit d9d8c839 ("json_writer: add SPDX Identifier (GPL-2/BSD-2)")

That commit explicitly removes the boiler plate and relicenses the code
uner GPL-2.0-only and BSD-2-Clause. As Steven wrote the original code and
also the relicensing commit, it's assumed that the relicensing was intended
to do exaclty that. Just the kernel side update failed to remove the boiler
plate. Do so now.

Fixes: 907b223651 ("tools: bpftool: dual license all files")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Jakub Kicinski <jakub.kicinski@netronome.com>
Cc: Roman Gushchin <guro@fb.com>
Cc: YueHaibing <yuehaibing@huawei.com>
Cc: Yonghong Song <yhs@fb.com>
Cc: Stanislav Fomichev <sdf@google.com>
Cc: Sean Young <sean@mess.org>
Cc: Jiri Benc <jbenc@redhat.com>
Cc: David Calavera <david.calavera@gmail.com>
Cc: Andrey Ignatov <rdna@fb.com>
Cc: Joe Stringer <joe@wand.net.nz>
Cc: David Ahern <dsahern@gmail.com>
Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: Petar Penkov <ppenkov@stanford.edu>
Cc: Sandipan Das <sandipan@linux.ibm.com>
Cc: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: John Fastabend <john.fastabend@gmail.com>
Cc: Taeung Song <treeze.taeung@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Quentin Monnet <quentin.monnet@netronome.com>
CC: okash.khawaja@gmail.com
Cc: netdev@vger.kernel.org
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2019-01-18 15:26:54 -08:00
Stanislav Fomichev
55c70bffc7 bpftool: add bash completion for peek/push/enqueue/pop/dequeue
bpftool map peek id <TAB>      - suggests only queue and stack map ids
bpftool map pop id <TAB>       - suggests only stack map ids
bpftool map dequeue id <TAB>   - suggests only queue map ids

bpftool map push id <TAB>      - suggests only stack map ids
bpftool map enqueue id <TAB>   - suggests only queue map ids

bpftool map push id 1 <TAB>    - suggests 'value', not 'key'
bpftool map enqueue id 2 <TAB> - suggests 'value', not 'key'

bpftool map update id <stack/queue type> - suggests 'value', not 'key'
bpftool map lookup id <stack/queue type> - suggests nothing

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-01-17 10:30:32 +01:00
Stanislav Fomichev
74f312ef84 bpftool: add pop and dequeue commands
This is intended to be used with queues and stacks, it pops and prints
the last element via bpf_map_lookup_and_delete_elem.

Example:

bpftool map create /sys/fs/bpf/q type queue value 4 entries 10 name q
bpftool map push pinned /sys/fs/bpf/q value 0 1 2 3
bpftool map pop pinned /sys/fs/bpf/q
value: 00 01 02 03
bpftool map pop pinned /sys/fs/bpf/q
Error: empty map

bpftool map create /sys/fs/bpf/s type stack value 4 entries 10 name s
bpftool map enqueue pinned /sys/fs/bpf/s value 0 1 2 3
bpftool map dequeue pinned /sys/fs/bpf/s
value: 00 01 02 03
bpftool map dequeue pinned /sys/fs/bpf/s
Error: empty map

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-01-17 10:30:32 +01:00
Stanislav Fomichev
549d4d3da7 bpftool: add push and enqueue commands
This is intended to be used with queues and stacks and be more
user-friendly than 'update' without the key.

Example:
bpftool map create /sys/fs/bpf/q type queue value 4 entries 10 name q
bpftool map push pinned /sys/fs/bpf/q value 0 1 2 3
bpftool map peek pinned /sys/fs/bpf/q
value: 00 01 02 03

bpftool map create /sys/fs/bpf/s type stack value 4 entries 10 name s
bpftool map enqueue pinned /sys/fs/bpf/s value 0 1 2 3
bpftool map peek pinned /sys/fs/bpf/s
value: 00 01 02 03

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-01-17 10:30:31 +01:00
Stanislav Fomichev
66cf6e0b12 bpftool: add peek command
This is intended to be used with queues and stacks and be more
user-friendly than 'lookup' without key/value.

Example:
bpftool map create /sys/fs/bpf/q type queue value 4 entries 10 name q
bpftool map update pinned /sys/fs/bpf/q value 0 1 2 3
bpftool map peek pinned /sys/fs/bpf/q
value: 00 01 02 03

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-01-17 10:30:31 +01:00
Stanislav Fomichev
04a5d323e6 bpftool: don't print empty key/value for maps
When doing dump or lookup, don't print key if key_size == 0 or value if
value_size == 0. The initial usecase is queue and stack, where we have
only values.

This is for regular output only, json still has all the fields.

Before:
bpftool map create /sys/fs/bpf/q type queue value 4 entries 10 name q
bpftool map update pinned /sys/fs/bpf/q value 0 1 2 3
bpftool map lookup pinned /sys/fs/bpf/q
key:   value: 00 01 02 03

After:
bpftool map create /sys/fs/bpf/q type queue value 4 entries 10 name q
bpftool map update pinned /sys/fs/bpf/q value 0 1 2 3
bpftool map lookup pinned /sys/fs/bpf/q
value: 00 01 02 03

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-01-17 10:30:31 +01:00
Stanislav Fomichev
8a89fff60a bpftool: make key optional in lookup command
Bpftool expects key for 'lookup' operations. For some map types, key should
not be specified. Support looking up those map types.

Before:
bpftool map create /sys/fs/bpf/q type queue value 4 entries 10 name q
bpftool map update pinned /sys/fs/bpf/q value 0 1 2 3
bpftool map lookup pinned /sys/fs/bpf/q
Error: did not find key

After:
bpftool map create /sys/fs/bpf/q type queue value 4 entries 10 name q
bpftool map update pinned /sys/fs/bpf/q value 0 1 2 3
bpftool map lookup pinned /sys/fs/bpf/q
key:   value: 00 01 02 03

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-01-17 10:30:31 +01:00
Stanislav Fomichev
7d7209cb9a bpftool: make key and value optional in update command
Bpftool expects both key and value for 'update' operations. For some
map types, key should not be specified. Support updating those map types.

Before:
bpftool map create /sys/fs/bpf/q type queue value 4 entries 10 name q
bpftool map update pinned /sys/fs/bpf/q value 0 1 2 3
Error: did not find key

After:
bpftool map create /sys/fs/bpf/q type queue value 4 entries 10 name q
bpftool map update pinned /sys/fs/bpf/q value 0 1 2 3

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-01-17 10:30:30 +01:00
Yonghong Song
e86e513854 tools/bpf: support __int128 in bpftool map pretty dumper
For formatted output, currently when json is enabled, the decimal
number is required. Similar to kernel bpffs printout,
for int128 numbers, only hex numbers are dumped, which are
quoted as strings.

The below is an example to show plain and json pretty print
based on the map in test_btf pretty print test.

  $ bpftool m s
  75: hash  name pprint_test_has  flags 0x0
        key 4B  value 112B  max_entries 4  memlock 4096B
  $ bpftool m d id 75
  ......
    {
        "key": 3,
        "value": {
            "ui32": 3,
            "ui16": 0,
            "si32": -3,
            "unused_bits2a": 0x3,
            "bits28": 0x3,
            "unused_bits2b": 0x3,
            "": {
                "ui64": 3,
                "ui8a": [3,0,0,0,0,0,0,0
                ]
            },
            "aenum": 3,
            "ui32b": 4,
            "bits2c": 0x1,
            "si128a": 0x3,
            "si128b": 0xfffffffd,
            "bits3": 0x3,
            "bits80": 0x10000000000000003,
            "ui128": 0x20000000000000003
        }
    },
  ......

  $ bptfool -p -j m d id 75
  ......
  {
        "key": ["0x03","0x00","0x00","0x00"
        ],
        "value": ["0x03","0x00","0x00","0x00","0x00","0x00","0x00","0x00",
                  "0xfd","0xff","0xff","0xff","0x0f","0x00","0x00","0xc0",
                  "0x03","0x00","0x00","0x00","0x00","0x00","0x00","0x00",
                  "0x03","0x00","0x00","0x00","0x04","0x00","0x00","0x00",
                  "0x01","0x00","0x00","0x00","0x00","0x00","0x00","0x00",
                  "0x00","0x00","0x00","0x00","0x00","0x00","0x00","0x00",
                  "0x03","0x00","0x00","0x00","0x00","0x00","0x00","0x00",
                  "0x00","0x00","0x00","0x00","0x00","0x00","0x00","0x00",
                  "0xfd","0xff","0xff","0xff","0x00","0x00","0x00","0x00",
                  "0x00","0x00","0x00","0x00","0x00","0x00","0x00","0x00",
                  "0x1b","0x00","0x00","0x00","0x00","0x00","0x00","0x00",
                  "0x08","0x00","0x00","0x00","0x00","0x00","0x00","0x00",
                  "0x03","0x00","0x00","0x00","0x00","0x00","0x00","0x00",
                  "0x02","0x00","0x00","0x00","0x00","0x00","0x00","0x00"
        ],
        "formatted": {
            "key": 3,
            "value": {
                "ui32": 3,
                "ui16": 0,
                "si32": -3,
                "unused_bits2a": "0x3",
                "bits28": "0x3",
                "unused_bits2b": "0x3",
                "": {
                    "ui64": 3,
                    "ui8a": [3,0,0,0,0,0,0,0
                    ]
                },
                "aenum": 3,
                "ui32b": 4,
                "bits2c": "0x1",
                "si128a": "0x3",
                "si128b": "0xfffffffd",
                "bits3": "0x3",
                "bits80": "0x10000000000000003",
                "ui128": "0x20000000000000003"
            }
        }
    }
  ......

Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-01-16 22:53:44 +01:00
Stanislav Fomichev
6e8ccb4f62 tools/bpf: properly account for libbfd variations
On some platforms, in order to link against libbfd, we need to
link against liberty and even possibly libz. Account for that
in the bpftool Makefile. We now have proper feature detection
for each case, so handle each one separately.

See recent commit 14541b1e7e ("perf build: Don't unconditionally link the
libbfd feature test to -liberty and -lz") where I fixed feature
detection.

v2 (addressed Jakub's nits):
  * better syntax for 'else ifeq'
  * no space between ifeq args
v3:
  * use LIBS, not EXTLIBS for -DHAVE_LIBBFD_SUPPORT

Fixes: 29a9c10e41 ("bpftool: make libbfd optional")
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-01-16 00:53:48 +01:00
Yonghong Song
298e59d322 tools/bpf: fix bpftool map dump with bitfields
Commit 8772c8bc09 ("tools: bpftool: support pretty print
with kind_flag set") added bpftool map dump with kind_flag
support. When bitfield_size can be retrieved directly from
btf_member, function btf_dumper_bitfield() is called to
dump the bitfield. The implementation passed the
wrong parameter "bit_offset" to the function. The excepted
value is the bit_offset within a byte while the passed-in
value is the struct member offset.

This commit fixed the bug with passing correct "bit_offset"
with adjusted data pointer.

Fixes: 8772c8bc09 ("tools: bpftool: support pretty print with kind_flag set")
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-01-11 10:40:54 +01:00
Ivan Babrou
9e88b9312a tools: bpftool: do not force gcc as CC
This allows transparent cross-compilation with CROSS_COMPILE by
relying on 7ed1c1901f ("tools: fix cross-compile var clobbering").

Signed-off-by: Ivan Babrou <ivan@cloudflare.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-12-19 21:57:25 +01:00
Quentin Monnet
33221307c3 tools: bpftool: add an option to prevent auto-mount of bpffs, tracefs
In order to make life easier for users, bpftool automatically attempts
to mount the BPF virtual file system, if it is not mounted already,
before trying to pin objects in it. Similarly, it attempts to mount
tracefs if necessary before trying to dump the trace pipe to the
console.

While mounting file systems on-the-fly can improve user experience, some
administrators might prefer to avoid that. Let's add an option to block
these mount attempts. Note that it does not prevent automatic mounting
of tracefs by debugfs for the "bpftool prog tracelog" command.

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-12-18 14:47:17 +01:00
Quentin Monnet
be3245e22d tools: bpftool: attempt to mount tracefs if required for tracelog cmd
As a follow-up to commit 30da46b5dc ("tools: bpftool: add a command to
dump the trace pipe"), attempt to mount the tracefs virtual file system
if it is not detected on the system before trying to dump content of the
tracing pipe on an invocation of "bpftool prog tracelog".

Usually, tracefs in automatically mounted by debugfs when the user tries
to access it (e.g. "ls /sys/kernel/debug/tracing" mounts the tracefs).
So if we failed to find it, it is probably that debugfs is not here
either. Therefore, we just attempt a single mount, at a location that
does not involve debugfs: /sys/kernel/tracing.

Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-12-18 14:47:17 +01:00
Yonghong Song
8772c8bc09 tools: bpftool: support pretty print with kind_flag set
The following example shows map pretty print with structures
which include bitfield members.

  enum A { A1, A2, A3, A4, A5 };
  typedef enum A ___A;
  struct tmp_t {
       char a1:4;
       int  a2:4;
       int  :4;
       __u32 a3:4;
       int b;
       ___A b1:4;
       enum A b2:4;
  };
  struct bpf_map_def SEC("maps") tmpmap = {
       .type = BPF_MAP_TYPE_ARRAY,
       .key_size = sizeof(__u32),
       .value_size = sizeof(struct tmp_t),
       .max_entries = 1,
  };
  BPF_ANNOTATE_KV_PAIR(tmpmap, int, struct tmp_t);

and the following map update in the bpf program:

  key = 0;
  struct tmp_t t = {};
  t.a1 = 2;
  t.a2 = 4;
  t.a3 = 6;
  t.b = 7;
  t.b1 = 8;
  t.b2 = 10;
  bpf_map_update_elem(&tmpmap, &key, &t, 0);

With this patch, I am able to print out the map values
correctly with this patch:
bpftool map dump id 187
  [{
        "key": 0,
        "value": {
            "a1": 0x2,
            "a2": 0x4,
            "a3": 0x6,
            "b": 7,
            "b1": 0x8,
            "b2": 0xa
        }
    }
  ]

Previously, if a function prototype argument has a typedef
type, the prototype is not printed since
function __btf_dumper_type_only() bailed out with error
if the type is a typedef. This commit corrected this
behavior by printing out typedef properly.

The following example shows forward type and
typedef type can be properly printed in function prototype
with modified test_btf_haskv.c.

  struct t;
  union  u;

  __attribute__((noinline))
  static int test_long_fname_1(struct dummy_tracepoint_args *arg,
                               struct t *p1, union u *p2,
                               __u32 unused)
  ...
  int _dummy_tracepoint(struct dummy_tracepoint_args *arg) {
    return test_long_fname_1(arg, 0, 0, 0);
  }

  $ bpftool p d xlated id 24
  ...
  int test_long_fname_1(struct dummy_tracepoint_args * arg,
                        struct t * p1, union u * p2,
                        __u32 unused)
  ...

Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-12-18 01:12:00 +01:00
Yonghong Song
9f95e37e31 tools: bpftool: refactor btf_dumper_int_bits()
The core dump funcitonality in btf_dumper_int_bits() is
refactored into a separate function btf_dumper_bitfield()
which will be used by the next patch.

Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-12-18 01:12:00 +01:00
Quentin Monnet
c101189bc9 tools: bpftool: fix -Wmissing declaration warnings
Help compiler check arguments for several utility functions used to
print items to the console by adding the "printf" attribute when
declaring those functions.

Also, declare as "static" two functions that are only used in prog.c.

All of them discovered by compiling bpftool with
-Wmissing-format-attribute -Wmissing-declarations.

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-12-15 01:31:49 +01:00
Quentin Monnet
8c03ecf712 tools: bpftool: fix warning on struct bpf_prog_linfo definition
The following warning appears when compiling bpftool without BFD
support:

main.h:198:23: warning: 'struct bpf_prog_linfo' declared inside
    parameter list will not be visible outside of this definition or
    declaration
          const struct bpf_prog_linfo *prog_linfo,

Fix it by declaring struct bpf_prog_linfo even in the case BFD is not
supported.

Fixes: b053b439b7 ("bpf: libbpf: bpftool: Print bpf_line_info during prog dump")
Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-12-15 01:31:49 +01:00
Quentin Monnet
bd0fb9d007 tools: bpftool: add a prog array map update example to documentation
Add an example in map documentation to show how to use bpftool in order
to update the references to programs hold by prog array maps.

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-12-15 01:31:49 +01:00
Quentin Monnet
32870ba407 tools: bpftool: fix examples in documentation for bpftool prog
Bring various fixes to the manual page for "bpftool prog" set of
commands:

- Fix typos ("dum" -> "dump")
- Harmonise indentation and format for command output
- Update date format for program load time
- Add instruction numbers on program dumps
- Fix JSON format for the example program listing

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-12-15 01:31:48 +01:00
Quentin Monnet
bc6cd66460 tools: bpftool: add doc for -m option to bpftool-prog.rst
The --mapcompat|-m option has been documented on the main bpftool.rst
page, and on the interactive help. As this option is useful for loading
programs with maps with the "bpftool prog load" command, it should also
appear in the related bpftool-prog.rst documentation page. Let's add it.

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-12-15 01:31:48 +01:00
Martin KaFai Lau
177e77169b bpf: Remove !func_info and !line_info check from test_btf and bpftool
kernel can provide the func_info and line_info even
it fails the btf_dump_raw_ok() test because they don't contain
kernel address.  This patch removes the corresponding '== 0'
test.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-12-13 12:16:31 +01:00
Jakub Kicinski
907b223651 tools: bpftool: dual license all files
Currently bpftool contains a mix of GPL-only and GPL or BSD2
licensed files.  Make sure all files are dual licensed under
GPLv2 and BSD-2-Clause.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Roman Gushchin <guro@fb.com>
Acked-by: YueHaibing <yuehaibing@huawei.com>
Acked-by: Yonghong Song <yhs@fb.com>
Acked-by: Stanislav Fomichev <sdf@google.com>
Acked-by: Sean Young <sean@mess.org>
Acked-by: Jiri Benc <jbenc@redhat.com>
Acked-by: David Calavera <david.calavera@gmail.com>
Acked-by: Andrey Ignatov <rdna@fb.com>
Acked-by: Joe Stringer <joe@wand.net.nz>
Acked-by: David Ahern <dsahern@gmail.com>
Acked-by: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Acked-by: Petar Penkov <ppenkov@stanford.edu>
Acked-by: Sandipan Das <sandipan@linux.ibm.com>
Acked-by: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Taeung Song <treeze.taeung@gmail.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
CC: okash.khawaja@gmail.com
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-12-13 12:08:44 +01:00
Jakub Kicinski
02ff58dcf7 tools: bpftool: replace Netronome boilerplate with SPDX license headers
Replace the repeated license text with SDPX identifiers.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Roman Gushchin <guro@fb.com>
Acked-by: YueHaibing <yuehaibing@huawei.com>
Acked-by: Yonghong Song <yhs@fb.com>
Acked-by: Stanislav Fomichev <sdf@google.com>
Acked-by: Sean Young <sean@mess.org>
Acked-by: Jiri Benc <jbenc@redhat.com>
Acked-by: David Calavera <david.calavera@gmail.com>
Acked-by: Andrey Ignatov <rdna@fb.com>
Acked-by: Joe Stringer <joe@wand.net.nz>
Acked-by: David Ahern <dsahern@gmail.com>
Acked-by: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Acked-by: Petar Penkov <ppenkov@stanford.edu>
Acked-by: Sandipan Das <sandipan@linux.ibm.com>
Acked-by: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Taeung Song <treeze.taeung@gmail.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
CC: okash.khawaja@gmail.com
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-12-13 12:08:44 +01:00
Jakub Kicinski
afc7c944ef tools: bpftool: fix SPDX format in headers
Documentation/process/license-rules.rst sayeth:

2. Style:

The SPDX license identifier is added in form of a comment.  The comment
style depends on the file type::

   C source: // SPDX-License-Identifier: <SPDX License Expression>
   C header: /* SPDX-License-Identifier: <SPDX License Expression> */

Headers should use C comment style.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Roman Gushchin <guro@fb.com>
Acked-by: YueHaibing <yuehaibing@huawei.com>
Acked-by: Yonghong Song <yhs@fb.com>
Acked-by: Stanislav Fomichev <sdf@google.com>
Acked-by: Sean Young <sean@mess.org>
Acked-by: Jiri Benc <jbenc@redhat.com>
Acked-by: David Calavera <david.calavera@gmail.com>
Acked-by: Andrey Ignatov <rdna@fb.com>
Acked-by: Joe Stringer <joe@wand.net.nz>
Acked-by: David Ahern <dsahern@gmail.com>
Acked-by: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Acked-by: Petar Penkov <ppenkov@stanford.edu>
Acked-by: Sandipan Das <sandipan@linux.ibm.com>
Acked-by: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Taeung Song <treeze.taeung@gmail.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
CC: okash.khawaja@gmail.com
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-12-13 12:08:44 +01:00
David S. Miller
addb067983 Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next
Daniel Borkmann says:

====================
pull-request: bpf-next 2018-12-11

The following pull-request contains BPF updates for your *net-next* tree.

It has three minor merge conflicts, resolutions:

1) tools/testing/selftests/bpf/test_verifier.c

 Take first chunk with alignment_prevented_execution.

2) net/core/filter.c

  [...]
  case bpf_ctx_range_ptr(struct __sk_buff, flow_keys):
  case bpf_ctx_range(struct __sk_buff, wire_len):
        return false;
  [...]

3) include/uapi/linux/bpf.h

  Take the second chunk for the two cases each.

The main changes are:

1) Add support for BPF line info via BTF and extend libbpf as well
   as bpftool's program dump to annotate output with BPF C code to
   facilitate debugging and introspection, from Martin.

2) Add support for BPF_ALU | BPF_ARSH | BPF_{K,X} in interpreter
   and all JIT backends, from Jiong.

3) Improve BPF test coverage on archs with no efficient unaligned
   access by adding an "any alignment" flag to the BPF program load
   to forcefully disable verifier alignment checks, from David.

4) Add a new bpf_prog_test_run_xattr() API to libbpf which allows for
   proper use of BPF_PROG_TEST_RUN with data_out, from Lorenz.

5) Extend tc BPF programs to use a new __sk_buff field called wire_len
   for more accurate accounting of packets going to wire, from Petar.

6) Improve bpftool to allow dumping the trace pipe from it and add
   several improvements in bash completion and map/prog dump,
   from Quentin.

7) Optimize arm64 BPF JIT to always emit movn/movk/movk sequence for
   kernel addresses and add a dedicated BPF JIT backend allocator,
   from Ard.

8) Add a BPF helper function for IR remotes to report mouse movements,
   from Sean.

9) Various cleanups in BPF prog dump e.g. to make UAPI bpf_prog_info
   member naming consistent with existing conventions, from Yonghong
   and Song.

10) Misc cleanups and improvements in allowing to pass interface name
    via cmdline for xdp1 BPF example, from Matteo.

11) Fix a potential segfault in BPF sample loader's kprobes handling,
    from Daniel T.

12) Fix SPDX license in libbpf's README.rst, from Andrey.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2018-12-10 18:00:43 -08:00
Yonghong Song
cfc542411b tools/bpf: rename *_info_cnt to nr_*_info
Rename all occurances of *_info_cnt field access
to nr_*_info in tools directory.

The local variables finfo_cnt, linfo_cnt and jited_linfo_cnt
in function do_dump() of tools/bpf/bpftool/prog.c are also
changed to nr_finfo, nr_linfo and nr_jited_linfo to
keep naming convention consistent.

Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-12-10 14:51:45 -08:00
Martin KaFai Lau
10a5ce9853 bpf: bpftool: Fix newline and p_err issue
This patch fixes a few newline issues and also
replaces p_err with p_info in prog.c

Fixes: b053b439b7 ("bpf: libbpf: bpftool: Print bpf_line_info during prog dump")
Cc: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-12-10 12:26:59 -08:00
David S. Miller
4cc1feeb6f Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Several conflicts, seemingly all over the place.

I used Stephen Rothwell's sample resolutions for many of these, if not
just to double check my own work, so definitely the credit largely
goes to him.

The NFP conflict consisted of a bug fix (moving operations
past the rhashtable operation) while chaning the initial
argument in the function call in the moved code.

The net/dsa/master.c conflict had to do with a bug fix intermixing of
making dsa_master_set_mtu() static with the fixing of the tagging
attribute location.

cls_flower had a conflict because the dup reject fix from Or
overlapped with the addition of port range classifiction.

__set_phy_supported()'s conflict was relatively easy to resolve
because Andrew fixed it in both trees, so it was just a matter
of taking the net-next copy.  Or at least I think it was :-)

Joe Stringer's fix to the handling of netns id 0 in bpf_sk_lookup()
intermixed with changes on how the sdif and caller_net are calculated
in these code paths in net-next.

The remaining BPF conflicts were largely about the addition of the
__bpf_md_ptr stuff in 'net' overlapping with adjustments and additions
to the relevant data structure where the MD pointer macros are used.

Signed-off-by: David S. Miller <davem@davemloft.net>
2018-12-09 21:43:31 -08:00
Martin KaFai Lau
b053b439b7 bpf: libbpf: bpftool: Print bpf_line_info during prog dump
This patch adds print bpf_line_info function in 'prog dump jitted'
and 'prog dump xlated':

[root@arch-fb-vm1 bpf]# ~/devshare/fb-kernel/linux/tools/bpf/bpftool/bpftool prog dump jited pinned /sys/fs/bpf/test_btf_haskv
[...]
int test_long_fname_2(struct dummy_tracepoint_args * arg):
bpf_prog_44a040bf25481309_test_long_fname_2:
; static int test_long_fname_2(struct dummy_tracepoint_args *arg)
   0:	push   %rbp
   1:	mov    %rsp,%rbp
   4:	sub    $0x30,%rsp
   b:	sub    $0x28,%rbp
   f:	mov    %rbx,0x0(%rbp)
  13:	mov    %r13,0x8(%rbp)
  17:	mov    %r14,0x10(%rbp)
  1b:	mov    %r15,0x18(%rbp)
  1f:	xor    %eax,%eax
  21:	mov    %rax,0x20(%rbp)
  25:	xor    %esi,%esi
; int key = 0;
  27:	mov    %esi,-0x4(%rbp)
; if (!arg->sock)
  2a:	mov    0x8(%rdi),%rdi
; if (!arg->sock)
  2e:	cmp    $0x0,%rdi
  32:	je     0x0000000000000070
  34:	mov    %rbp,%rsi
; counts = bpf_map_lookup_elem(&btf_map, &key);
  37:	add    $0xfffffffffffffffc,%rsi
  3b:	movabs $0xffff8881139d7480,%rdi
  45:	add    $0x110,%rdi
  4c:	mov    0x0(%rsi),%eax
  4f:	cmp    $0x4,%rax
  53:	jae    0x000000000000005e
  55:	shl    $0x3,%rax
  59:	add    %rdi,%rax
  5c:	jmp    0x0000000000000060
  5e:	xor    %eax,%eax
; if (!counts)
  60:	cmp    $0x0,%rax
  64:	je     0x0000000000000070
; counts->v6++;
  66:	mov    0x4(%rax),%edi
  69:	add    $0x1,%rdi
  6d:	mov    %edi,0x4(%rax)
  70:	mov    0x0(%rbp),%rbx
  74:	mov    0x8(%rbp),%r13
  78:	mov    0x10(%rbp),%r14
  7c:	mov    0x18(%rbp),%r15
  80:	add    $0x28,%rbp
  84:	leaveq
  85:	retq
[...]

With linum:
[root@arch-fb-vm1 bpf]# ~/devshare/fb-kernel/linux/tools/bpf/bpftool/bpftool prog dump jited pinned /sys/fs/bpf/test_btf_haskv linum
int _dummy_tracepoint(struct dummy_tracepoint_args * arg):
bpf_prog_b07ccb89267cf242__dummy_tracepoint:
; return test_long_fname_1(arg); [file:/data/users/kafai/fb-kernel/linux/tools/testing/selftests/bpf/test_btf_haskv.c line_num:54 line_col:9]
   0:	push   %rbp
   1:	mov    %rsp,%rbp
   4:	sub    $0x28,%rsp
   b:	sub    $0x28,%rbp
   f:	mov    %rbx,0x0(%rbp)
  13:	mov    %r13,0x8(%rbp)
  17:	mov    %r14,0x10(%rbp)
  1b:	mov    %r15,0x18(%rbp)
  1f:	xor    %eax,%eax
  21:	mov    %rax,0x20(%rbp)
  25:	callq  0x000000000000851e
; return test_long_fname_1(arg); [file:/data/users/kafai/fb-kernel/linux/tools/testing/selftests/bpf/test_btf_haskv.c line_num:54 line_col:2]
  2a:	xor    %eax,%eax
  2c:	mov    0x0(%rbp),%rbx
  30:	mov    0x8(%rbp),%r13
  34:	mov    0x10(%rbp),%r14
  38:	mov    0x18(%rbp),%r15
  3c:	add    $0x28,%rbp
  40:	leaveq
  41:	retq
[...]

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-12-09 13:54:38 -08:00
Martin KaFai Lau
84ecc1f98c bpf: Expect !info.func_info and insn_off name changes in test_btf/libbpf/bpftool
Similar to info.jited_*, info.func_info could be 0 if
bpf_dump_raw_ok() == false.

This patch makes changes to test_btf and bpftool to expect info.func_info
could be 0.

This patch also makes the needed changes for s/insn_offset/insn_off/.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-12-05 18:48:40 -08:00
Quentin Monnet
30da46b5dc tools: bpftool: add a command to dump the trace pipe
BPF programs can use the bpf_trace_printk() helper to print debug
information into the trace pipe. Add a subcommand
"bpftool prog tracelog" to simply dump this pipe to the console.

This is for a good part copied from iproute2, where the feature is
available with "tc exec bpf dbg". Changes include dumping pipe content
to stdout instead of stderr and adding JSON support (content is dumped
as an array of strings, one per line read from the pipe). This version
is dual-licensed, with Daniel's permission.

Cc: Daniel Borkmann <daniel@iogearbox.net>
Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2018-12-05 16:41:52 +01:00
Quentin Monnet
99a44bef58 tools: bpftool: add owner_prog_type and owner_jited to bpftool output
For prog array maps, the type of the owner program, and the JIT-ed state
of that program, are available from the file descriptor information
under /proc. Add them to "bpftool map show" output. Example output:

    # bpftool map show
    158225: prog_array  name jmp_table  flags 0x0
        key 4B  value 4B  max_entries 8  memlock 4096B
        owner_prog_type flow_dissector  owner jited
    # bpftool --json --pretty map show
    [{
            "id": 1337,
            "type": "prog_array",
            "name": "jmp_table",
            "flags": 0,
            "bytes_key": 4,
            "bytes_value": 4,
            "max_entries": 8,
            "bytes_memlock": 4096,
            "owner_prog_type": "flow_dissector",
            "owner_jited": true
        }
    ]

As we move the table used for associating names to program types,
complete it with the missing types (lwt_seg6local and sk_reuseport).
Also add missing types to the help message for "bpftool prog"
(sk_reuseport and flow_dissector).

Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-11-30 14:06:07 -08:00
Quentin Monnet
73f0b9db53 tools: bpftool: mark offloaded programs more explicitly in plain output
In bpftool (plain) output for "bpftool prog show" or "bpftool map show",
an offloaded BPF object is simply denoted with "dev ifname", which is
not really explicit. Change it with something that clearly shows the
program is offloaded.

While at it also add an additional space, as done between other
information fields.

Example output, before:

    # bpftool prog show
    1337: xdp  tag a04f5eef06a7f555 dev foo
            loaded_at 2018-10-19T16:40:36+0100  uid 0
            xlated 16B  not jited  memlock 4096B

After:

    # bpftool prog show
    1337: xdp  tag a04f5eef06a7f555  offloaded_to foo
            loaded_at 2018-10-19T16:40:36+0100  uid 0
            xlated 16B  not jited  memlock 4096B

Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-11-30 14:06:06 -08:00
Quentin Monnet
4f0fc6f571 tools: bpftool: fix bash completion for new map types (queue and stack)
Commit 197c2dac74 ("bpf: Add BPF_MAP_TYPE_QUEUE and BPF_MAP_TYPE_STACK
to bpftool-map") added support for queue and stack eBPF map types in
bpftool map handling. Let's update the bash completion accordingly.

Fixes: 197c2dac74 ("bpf: Add BPF_MAP_TYPE_QUEUE and BPF_MAP_TYPE_STACK to bpftool-map")
Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-11-30 14:06:06 -08:00
Quentin Monnet
cad4977344 tools: bpftool: fix bash completion for bpftool prog (attach|detach)
Fix bash completion for "bpftool prog (attach|detach) PROG TYPE MAP" so
that the list of indices proposed for MAP are map indices, and not PROG
indices. Also use variables for map and prog reference types ("id",
"pinned", and "tag" for programs).

Fixes: b7d3826c2e ("bpf: bpftool, add support for attaching programs to maps")
Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2018-11-30 14:06:06 -08:00