diff --git a/tools/bpf/bpftool/Documentation/bpftool-cgroup.rst b/tools/bpf/bpftool/Documentation/bpftool-cgroup.rst
index d07ccf8a23f7170be674d12a08957d673a560f77..d43fce568ef7cf6fd6bb1d74abbd4e4347de0255 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-cgroup.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-cgroup.rst
@@ -142,5 +142,6 @@ SEE ALSO
**bpftool**\ (8),
**bpftool-prog**\ (8),
**bpftool-map**\ (8),
+ **bpftool-feature**\ (8),
**bpftool-net**\ (8),
**bpftool-perf**\ (8)
diff --git a/tools/bpf/bpftool/Documentation/bpftool-feature.rst b/tools/bpf/bpftool/Documentation/bpftool-feature.rst
new file mode 100644
index 0000000000000000000000000000000000000000..40ac13c0b7821127786eee872f925a7b54c4da32
--- /dev/null
+++ b/tools/bpf/bpftool/Documentation/bpftool-feature.rst
@@ -0,0 +1,60 @@
+===============
+bpftool-feature
+===============
+-------------------------------------------------------------------------------
+tool for inspection of eBPF-related parameters for Linux kernel or net device
+-------------------------------------------------------------------------------
+
+:Manual section: 8
+
+SYNOPSIS
+========
+
+ **bpftool** [*OPTIONS*] **feature** *COMMAND*
+
+ *OPTIONS* := { { **-j** | **--json** } [{ **-p** | **--pretty** }] }
+
+ *COMMANDS* := { **probe** | **help** }
+
+MAP COMMANDS
+=============
+
+| **bpftool** **feature probe** [**kernel**]
+| **bpftool** **feature help**
+
+DESCRIPTION
+===========
+ **bpftool feature probe** [**kernel**]
+ Probe the running kernel and dump a number of eBPF-related
+ parameters, such as availability of the **bpf()** system call.
+
+ Keyword **kernel** can be omitted.
+
+ **bpftool feature help**
+ Print short help message.
+
+OPTIONS
+=======
+ -h, --help
+ Print short generic help message (similar to **bpftool help**).
+
+ -v, --version
+ Print version number (similar to **bpftool version**).
+
+ -j, --json
+ Generate JSON output. For commands that cannot produce JSON, this
+ option has no effect.
+
+ -p, --pretty
+ Generate human-readable JSON output. Implies **-j**.
+
+SEE ALSO
+========
+ **bpf**\ (2),
+ **bpf-helpers**\ (7),
+ **bpftool**\ (8),
+ **bpftool-prog**\ (8),
+ **bpftool-map**\ (8),
+ **bpftool-cgroup**\ (8),
+ **bpftool-net**\ (8),
+ **bpftool-perf**\ (8)
diff --git a/tools/bpf/bpftool/Documentation/bpftool-map.rst b/tools/bpf/bpftool/Documentation/bpftool-map.rst
index 0584c31d3fe2582b5165ab477c1f15e0136edbac..5c984ffc9f01e8bcece0499dde198eb51c321197 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-map.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-map.rst
@@ -256,5 +256,6 @@ SEE ALSO
**bpftool**\ (8),
**bpftool-prog**\ (8),
**bpftool-cgroup**\ (8),
+ **bpftool-feature**\ (8),
**bpftool-net**\ (8),
**bpftool-perf**\ (8)
diff --git a/tools/bpf/bpftool/Documentation/bpftool-net.rst b/tools/bpf/bpftool/Documentation/bpftool-net.rst
index ed87c9b619adc889310e7795bcfcc4b790251827..779dab3650eeb20047d4a9114d2c8da8bf796dca 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-net.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-net.rst
@@ -142,4 +142,5 @@ SEE ALSO
**bpftool-prog**\ (8),
**bpftool-map**\ (8),
**bpftool-cgroup**\ (8),
+ **bpftool-feature**\ (8),
**bpftool-perf**\ (8)
diff --git a/tools/bpf/bpftool/Documentation/bpftool-perf.rst b/tools/bpf/bpftool/Documentation/bpftool-perf.rst
index f4c5e5538bb8e516624b0f28f749bf613c5a477e..bca5590a80d057dfb7b1c1c1b5d581536f88de27 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-perf.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-perf.rst
@@ -84,4 +84,5 @@ SEE ALSO
**bpftool-prog**\ (8),
**bpftool-map**\ (8),
**bpftool-cgroup**\ (8),
+ **bpftool-feature**\ (8),
**bpftool-net**\ (8)
diff --git a/tools/bpf/bpftool/Documentation/bpftool-prog.rst b/tools/bpf/bpftool/Documentation/bpftool-prog.rst
index 58c8369b77dd556f59c10f8f3266b97cbb671c57..13b56102f5288cdef6f75879bd0a2ac9946a6fd3 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-prog.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-prog.rst
@@ -258,5 +258,6 @@ SEE ALSO
**bpftool**\ (8),
**bpftool-map**\ (8),
**bpftool-cgroup**\ (8),
+ **bpftool-feature**\ (8),
**bpftool-net**\ (8),
**bpftool-perf**\ (8)
diff --git a/tools/bpf/bpftool/Documentation/bpftool.rst b/tools/bpf/bpftool/Documentation/bpftool.rst
index e1677e81ed594a81d9bf8330e46b1d860038f663..27153bb816ac40b58c512ec593e5193adef148e0 100644
--- a/tools/bpf/bpftool/Documentation/bpftool.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool.rst
@@ -72,5 +72,6 @@ SEE ALSO
**bpftool-prog**\ (8),
**bpftool-map**\ (8),
**bpftool-cgroup**\ (8),
+ **bpftool-feature**\ (8),
**bpftool-net**\ (8),
**bpftool-perf**\ (8)
diff --git a/tools/bpf/bpftool/feature.c b/tools/bpf/bpftool/feature.c
new file mode 100644
index 0000000000000000000000000000000000000000..954fb12a52284d6bb11a302e8fdf72870da40ece
--- /dev/null
+++ b/tools/bpf/bpftool/feature.c
@@ -0,0 +1,131 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/* Copyright (c) 2019 Netronome Systems, Inc. */
+
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/utsname.h>
+
+#include <linux/filter.h>
+#include <linux/limits.h>
+
+#include <bpf.h>
+
+#include "main.h"
+
+enum probe_component {
+ COMPONENT_UNSPEC,
+ COMPONENT_KERNEL,
+};
+
+/* Printing utility functions */
+
+static void
+print_bool_feature(const char *feat_name, const char *plain_name, bool res)
+{
+ if (json_output)
+ jsonw_bool_field(json_wtr, feat_name, res);
+ else
+ printf("%s is %savailable\n", plain_name, res ? "" : "NOT ");
+}
+
+static void
+print_start_section(const char *json_title, const char *plain_title)
+{
+ if (json_output) {
+ jsonw_name(json_wtr, json_title);
+ jsonw_start_object(json_wtr);
+ } else {
+ printf("%s\n", plain_title);
+ }
+}
+
+/* Probing functions */
+
+static bool probe_bpf_syscall(void)
+{
+ bool res;
+
+ bpf_load_program(BPF_PROG_TYPE_UNSPEC, NULL, 0, NULL, 0, NULL, 0);
+ res = (errno != ENOSYS);
+
+ print_bool_feature("have_bpf_syscall",
+ "bpf() syscall",
+ res);
+
+ return res;
+}
+
+static int do_probe(int argc, char **argv)
+{
+ enum probe_component target = COMPONENT_UNSPEC;
+
+ /* Detection assumes user has sufficient privileges (CAP_SYS_ADMIN).
+ * Let's approximate, and restrict usage to root user only.
+ */
+ if (geteuid()) {
+ p_err("please run this command as root user");
+ return -1;
+ }
+
+ set_max_rlimit();
+
+ while (argc) {
+ if (is_prefix(*argv, "kernel")) {
+ if (target != COMPONENT_UNSPEC) {
+ p_err("component to probe already specified");
+ return -1;
+ }
+ target = COMPONENT_KERNEL;
+ NEXT_ARG();
+ } else {
+ p_err("expected no more arguments, 'kernel', got: '%s'?",
+ *argv);
+ return -1;
+ }
+ }
+
+ if (json_output)
+ jsonw_start_object(json_wtr);
+
+ print_start_section("syscall_config",
+ "Scanning system call availability...");
+
+ probe_bpf_syscall();
+
+ if (json_output) {
+ /* End current "section" of probes */
+ jsonw_end_object(json_wtr);
+ /* End root object */
+ jsonw_end_object(json_wtr);
+ }
+
+ return 0;
+}
+
+static int do_help(int argc, char **argv)
+{
+ if (json_output) {
+ jsonw_null(json_wtr);
+ return 0;
+ }
+
+ fprintf(stderr,
+ "Usage: %s %s probe [kernel]\n"
+ " %s %s help\n"
+ "",
+ bin_name, argv[-2], bin_name, argv[-2]);
+
+ return 0;
+}
+
+static const struct cmd cmds[] = {
+ { "help", do_help },
+ { "probe", do_probe },
+ { 0 }
+};
+
+int do_feature(int argc, char **argv)
+{
+ return cmd_select(cmds, argc, argv, do_help);
+}
diff --git a/tools/bpf/bpftool/main.c b/tools/bpf/bpftool/main.c
index f44a1c2c4ea06f5ff4793e93bdcff344092c8871..a9d5e9e6a7327d9a8af33825e8daa93f4c06fc4e 100644
--- a/tools/bpf/bpftool/main.c
+++ b/tools/bpf/bpftool/main.c
@@ -56,7 +56,7 @@ static int do_help(int argc, char **argv)
" %s batch file FILE\n"
" %s version\n"
"\n"
- " OBJECT := { prog | map | cgroup | perf | net }\n"
+ " OBJECT := { prog | map | cgroup | perf | net | feature }\n"
" " HELP_SPEC_OPTIONS "\n"
"",
bin_name, bin_name, bin_name);
@@ -187,6 +187,7 @@ static const struct cmd cmds[] = {
{ "cgroup", do_cgroup },
{ "perf", do_perf },
{ "net", do_net },
+ { "feature", do_feature },
{ "version", do_version },
{ 0 }
};
diff --git a/tools/bpf/bpftool/main.h b/tools/bpf/bpftool/main.h
index 052c91d4dc5585b46f420da26498e6808695401f..5cfc6601de9b51004bc3bdd2788c248a1fbb82f9 100644
--- a/tools/bpf/bpftool/main.h
+++ b/tools/bpf/bpftool/main.h
@@ -145,6 +145,7 @@ int do_cgroup(int argc, char **arg);
int do_perf(int argc, char **arg);
int do_net(int argc, char **arg);
int do_tracelog(int argc, char **arg);
+int do_feature(int argc, char **argv);
int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what);
int prog_parse_fd(int *argc, char ***argv);