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-rw-r--r--tools/bpf/bpftool/Documentation/bpftool-feature.rst18
-rw-r--r--tools/bpf/bpftool/feature.c69
2 files changed, 73 insertions, 14 deletions
diff --git a/tools/bpf/bpftool/Documentation/bpftool-feature.rst b/tools/bpf/bpftool/Documentation/bpftool-feature.rst
index 53092995f46b..8d489a26e3c9 100644
--- a/tools/bpf/bpftool/Documentation/bpftool-feature.rst
+++ b/tools/bpf/bpftool/Documentation/bpftool-feature.rst
@@ -19,14 +19,18 @@ SYNOPSIS
MAP COMMANDS
=============
-| **bpftool** **feature probe** [**kernel**] [**macros** [**prefix** *PREFIX*]]
+| **bpftool** **feature probe** [*COMPONENT*] [**macros** [**prefix** *PREFIX*]]
| **bpftool** **feature help**
+|
+| *COMPONENT* := { **kernel** | **dev** *NAME* }
DESCRIPTION
===========
**bpftool feature probe** [**kernel**] [**macros** [**prefix** *PREFIX*]]
Probe the running kernel and dump a number of eBPF-related
- parameters, such as availability of the **bpf()** system call.
+ parameters, such as availability of the **bpf()** system call,
+ JIT status, eBPF program types availability, eBPF helper
+ functions availability, and more.
If the **macros** keyword (but not the **-j** option) is
passed, a subset of the output is dumped as a list of
@@ -37,12 +41,20 @@ DESCRIPTION
avoid conflicts on macro names when including the output of
this command as a header file.
- Keyword **kernel** can be omitted.
+ Keyword **kernel** can be omitted. If no probe target is
+ specified, probing the kernel is the default behaviour.
Note that when probed, some eBPF helpers (e.g.
**bpf_trace_printk**\ () or **bpf_probe_write_user**\ ()) may
print warnings to kernel logs.
+ **bpftool feature probe dev** *NAME* [**macros** [**prefix** *PREFIX*]]
+ Probe network device for supported eBPF features and dump
+ results to the console.
+
+ The two keywords **macros** and **prefix** have the same
+ role as when probing the kernel.
+
**bpftool feature help**
Print short help message.
diff --git a/tools/bpf/bpftool/feature.c b/tools/bpf/bpftool/feature.c
index a62e637953b7..993c6f1e5473 100644
--- a/tools/bpf/bpftool/feature.c
+++ b/tools/bpf/bpftool/feature.c
@@ -5,6 +5,7 @@
#include <errno.h>
#include <string.h>
#include <unistd.h>
+#include <net/if.h>
#include <sys/utsname.h>
#include <sys/vfs.h>
@@ -23,6 +24,7 @@
enum probe_component {
COMPONENT_UNSPEC,
COMPONENT_KERNEL,
+ COMPONENT_DEVICE,
};
#define BPF_HELPER_MAKE_ENTRY(name) [BPF_FUNC_ ## name] = "bpf_" # name
@@ -456,14 +458,24 @@ static bool probe_bpf_syscall(const char *define_prefix)
static void
probe_prog_type(enum bpf_prog_type prog_type, bool *supported_types,
- const char *define_prefix)
+ const char *define_prefix, __u32 ifindex)
{
char feat_name[128], plain_desc[128], define_name[128];
const char *plain_comment = "eBPF program_type ";
size_t maxlen;
bool res;
- res = bpf_probe_prog_type(prog_type, 0);
+ if (ifindex)
+ /* Only test offload-able program types */
+ switch (prog_type) {
+ case BPF_PROG_TYPE_SCHED_CLS:
+ case BPF_PROG_TYPE_XDP:
+ break;
+ default:
+ return;
+ }
+
+ res = bpf_probe_prog_type(prog_type, ifindex);
supported_types[prog_type] |= res;
@@ -482,14 +494,15 @@ probe_prog_type(enum bpf_prog_type prog_type, bool *supported_types,
}
static void
-probe_map_type(enum bpf_map_type map_type, const char *define_prefix)
+probe_map_type(enum bpf_map_type map_type, const char *define_prefix,
+ __u32 ifindex)
{
char feat_name[128], plain_desc[128], define_name[128];
const char *plain_comment = "eBPF map_type ";
size_t maxlen;
bool res;
- res = bpf_probe_map_type(map_type, 0);
+ res = bpf_probe_map_type(map_type, ifindex);
maxlen = sizeof(plain_desc) - strlen(plain_comment) - 1;
if (strlen(map_type_name[map_type]) > maxlen) {
@@ -507,13 +520,23 @@ probe_map_type(enum bpf_map_type map_type, const char *define_prefix)
static void
probe_helpers_for_progtype(enum bpf_prog_type prog_type, bool supported_type,
- const char *define_prefix)
+ const char *define_prefix, __u32 ifindex)
{
const char *ptype_name = prog_type_name[prog_type];
char feat_name[128];
unsigned int id;
bool res;
+ if (ifindex)
+ /* Only test helpers for offload-able program types */
+ switch (prog_type) {
+ case BPF_PROG_TYPE_SCHED_CLS:
+ case BPF_PROG_TYPE_XDP:
+ break;
+ default:
+ return;
+ }
+
if (json_output) {
sprintf(feat_name, "%s_available_helpers", ptype_name);
jsonw_name(json_wtr, feat_name);
@@ -527,7 +550,7 @@ probe_helpers_for_progtype(enum bpf_prog_type prog_type, bool supported_type,
if (!supported_type)
res = false;
else
- res = bpf_probe_helper(id, prog_type, 0);
+ res = bpf_probe_helper(id, prog_type, ifindex);
if (json_output) {
if (res)
@@ -553,7 +576,9 @@ static int do_probe(int argc, char **argv)
enum probe_component target = COMPONENT_UNSPEC;
const char *define_prefix = NULL;
bool supported_types[128] = {};
+ __u32 ifindex = 0;
unsigned int i;
+ char *ifname;
/* Detection assumes user has sufficient privileges (CAP_SYS_ADMIN).
* Let's approximate, and restrict usage to root user only.
@@ -573,6 +598,24 @@ static int do_probe(int argc, char **argv)
}
target = COMPONENT_KERNEL;
NEXT_ARG();
+ } else if (is_prefix(*argv, "dev")) {
+ NEXT_ARG();
+
+ if (target != COMPONENT_UNSPEC || ifindex) {
+ p_err("component to probe already specified");
+ return -1;
+ }
+ if (!REQ_ARGS(1))
+ return -1;
+
+ target = COMPONENT_DEVICE;
+ ifname = GET_ARG();
+ ifindex = if_nametoindex(ifname);
+ if (!ifindex) {
+ p_err("unrecognized netdevice '%s': %s", ifname,
+ strerror(errno));
+ return -1;
+ }
} else if (is_prefix(*argv, "macros") && !define_prefix) {
define_prefix = "";
NEXT_ARG();
@@ -591,7 +634,7 @@ static int do_probe(int argc, char **argv)
return -1;
define_prefix = GET_ARG();
} else {
- p_err("expected no more arguments, 'kernel', 'macros' or 'prefix', got: '%s'?",
+ p_err("expected no more arguments, 'kernel', 'dev', 'macros' or 'prefix', got: '%s'?",
*argv);
return -1;
}
@@ -627,6 +670,8 @@ static int do_probe(int argc, char **argv)
else
printf("\n");
break;
+ default:
+ break;
}
print_start_section("syscall_config",
@@ -644,7 +689,7 @@ static int do_probe(int argc, char **argv)
define_prefix);
for (i = BPF_PROG_TYPE_UNSPEC + 1; i < ARRAY_SIZE(prog_type_name); i++)
- probe_prog_type(i, supported_types, define_prefix);
+ probe_prog_type(i, supported_types, define_prefix, ifindex);
print_end_then_start_section("map_types",
"Scanning eBPF map types...",
@@ -652,7 +697,7 @@ static int do_probe(int argc, char **argv)
define_prefix);
for (i = BPF_MAP_TYPE_UNSPEC + 1; i < map_type_name_size; i++)
- probe_map_type(i, define_prefix);
+ probe_map_type(i, define_prefix, ifindex);
print_end_then_start_section("helpers",
"Scanning eBPF helper functions...",
@@ -676,7 +721,7 @@ static int do_probe(int argc, char **argv)
define_prefix);
for (i = BPF_PROG_TYPE_UNSPEC + 1; i < ARRAY_SIZE(prog_type_name); i++)
probe_helpers_for_progtype(i, supported_types[i],
- define_prefix);
+ define_prefix, ifindex);
exit_close_json:
if (json_output) {
@@ -697,8 +742,10 @@ static int do_help(int argc, char **argv)
}
fprintf(stderr,
- "Usage: %s %s probe [kernel] [macros [prefix PREFIX]]\n"
+ "Usage: %s %s probe [COMPONENT] [macros [prefix PREFIX]]\n"
" %s %s help\n"
+ "\n"
+ " COMPONENT := { kernel | dev NAME }\n"
"",
bin_name, argv[-2], bin_name, argv[-2]);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-15 16:44:22 +0000