Remove all calls of print_end_then_start_section function and for loops out from the do_probe function. Instead, provide separate functions for each section (like i.e. section_helpers) which are called in do_probe.
Next changes are going to allow probing chosen subsets of features. This change will make them more readable.
Signed-off-by: Michal Rostecki mrostecki@opensuse.org --- tools/bpf/bpftool/feature.c | 219 +++++++++++++++++++++--------------- 1 file changed, 126 insertions(+), 93 deletions(-)
diff --git a/tools/bpf/bpftool/feature.c b/tools/bpf/bpftool/feature.c index 941873d778d8..345e4a2b4f53 100644 --- a/tools/bpf/bpftool/feature.c +++ b/tools/bpf/bpftool/feature.c @@ -112,18 +112,12 @@ print_start_section(const char *json_title, const char *plain_title, } }
-static void -print_end_then_start_section(const char *json_title, const char *plain_title, - const char *define_comment, - const char *define_prefix) +static void print_end_section(void) { if (json_output) jsonw_end_object(json_wtr); else printf("\n"); - - print_start_section(json_title, plain_title, define_comment, - define_prefix); }
/* Probing functions */ @@ -584,13 +578,130 @@ probe_large_insn_limit(const char *define_prefix, __u32 ifindex) res, define_prefix); }
+static void +section_system_config(enum probe_component target, const char *define_prefix) +{ + switch (target) { + case COMPONENT_KERNEL: + case COMPONENT_UNSPEC: + if (define_prefix) + break; + + print_start_section("system_config", + "Scanning system configuration...", + NULL, /* define_comment never used here */ + NULL); /* define_prefix always NULL here */ + if (check_procfs()) { + probe_unprivileged_disabled(); + probe_jit_enable(); + probe_jit_harden(); + probe_jit_kallsyms(); + probe_jit_limit(); + } else { + p_info("/* procfs not mounted, skipping related probes */"); + } + probe_kernel_image_config(); + print_end_section(); + break; + default: + break; + } +} + +static bool section_syscall_config(const char *define_prefix) +{ + bool res; + + print_start_section("syscall_config", + "Scanning system call availability...", + "/*** System call availability ***/", + define_prefix); + res = probe_bpf_syscall(define_prefix); + print_end_section(); + + return res; +} + +static void +section_program_types(bool *supported_types, const char *define_prefix, + __u32 ifindex) +{ + unsigned int i; + + print_start_section("program_types", + "Scanning eBPF program types...", + "/*** eBPF program types ***/", + define_prefix); + + for (i = BPF_PROG_TYPE_UNSPEC + 1; i < ARRAY_SIZE(prog_type_name); i++) + probe_prog_type(i, supported_types, define_prefix, ifindex); + + print_end_section(); +} + +static void section_map_types(const char *define_prefix, __u32 ifindex) +{ + unsigned int i; + + print_start_section("map_types", + "Scanning eBPF map types...", + "/*** eBPF map types ***/", + define_prefix); + + for (i = BPF_MAP_TYPE_UNSPEC + 1; i < map_type_name_size; i++) + probe_map_type(i, define_prefix, ifindex); + + print_end_section(); +} + +static void +section_helpers(bool *supported_types, const char *define_prefix, __u32 ifindex) +{ + unsigned int i; + + print_start_section("helpers", + "Scanning eBPF helper functions...", + "/*** eBPF helper functions ***/", + define_prefix); + + if (define_prefix) + printf("/*\n" + " * Use %sHAVE_PROG_TYPE_HELPER(prog_type_name, helper_name)\n" + " * to determine if <helper_name> is available for <prog_type_name>,\n" + " * e.g.\n" + " * #if %sHAVE_PROG_TYPE_HELPER(xdp, bpf_redirect)\n" + " * // do stuff with this helper\n" + " * #elif\n" + " * // use a workaround\n" + " * #endif\n" + " */\n" + "#define %sHAVE_PROG_TYPE_HELPER(prog_type, helper) \\n" + " %sBPF__PROG_TYPE_ ## prog_type ## __HELPER_ ## helper\n", + define_prefix, define_prefix, define_prefix, + 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, ifindex); + + print_end_section(); +} + +static void section_misc(const char *define_prefix, __u32 ifindex) +{ + print_start_section("misc", + "Scanning miscellaneous eBPF features...", + "/*** eBPF misc features ***/", + define_prefix); + probe_large_insn_limit(define_prefix, ifindex); + print_end_section(); +} + 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). @@ -658,97 +769,19 @@ static int do_probe(int argc, char **argv) jsonw_start_object(json_wtr); }
- switch (target) { - case COMPONENT_KERNEL: - case COMPONENT_UNSPEC: - if (define_prefix) - break; - - print_start_section("system_config", - "Scanning system configuration...", - NULL, /* define_comment never used here */ - NULL); /* define_prefix always NULL here */ - if (check_procfs()) { - probe_unprivileged_disabled(); - probe_jit_enable(); - probe_jit_harden(); - probe_jit_kallsyms(); - probe_jit_limit(); - } else { - p_info("/* procfs not mounted, skipping related probes */"); - } - probe_kernel_image_config(); - if (json_output) - jsonw_end_object(json_wtr); - else - printf("\n"); - break; - default: - break; - } - - print_start_section("syscall_config", - "Scanning system call availability...", - "/*** System call availability ***/", - define_prefix); - - if (!probe_bpf_syscall(define_prefix)) + section_system_config(target, define_prefix); + if (!section_syscall_config(define_prefix)) /* bpf() syscall unavailable, don't probe other BPF features */ goto exit_close_json; - - print_end_then_start_section("program_types", - "Scanning eBPF program types...", - "/*** eBPF program types ***/", - define_prefix); - - for (i = BPF_PROG_TYPE_UNSPEC + 1; i < ARRAY_SIZE(prog_type_name); i++) - probe_prog_type(i, supported_types, define_prefix, ifindex); - - print_end_then_start_section("map_types", - "Scanning eBPF map types...", - "/*** eBPF map types ***/", - define_prefix); - - for (i = BPF_MAP_TYPE_UNSPEC + 1; i < map_type_name_size; i++) - probe_map_type(i, define_prefix, ifindex); - - print_end_then_start_section("helpers", - "Scanning eBPF helper functions...", - "/*** eBPF helper functions ***/", - define_prefix); - - if (define_prefix) - printf("/*\n" - " * Use %sHAVE_PROG_TYPE_HELPER(prog_type_name, helper_name)\n" - " * to determine if <helper_name> is available for <prog_type_name>,\n" - " * e.g.\n" - " * #if %sHAVE_PROG_TYPE_HELPER(xdp, bpf_redirect)\n" - " * // do stuff with this helper\n" - " * #elif\n" - " * // use a workaround\n" - " * #endif\n" - " */\n" - "#define %sHAVE_PROG_TYPE_HELPER(prog_type, helper) \\n" - " %sBPF__PROG_TYPE_ ## prog_type ## __HELPER_ ## helper\n", - define_prefix, define_prefix, define_prefix, - 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, ifindex); - - print_end_then_start_section("misc", - "Scanning miscellaneous eBPF features...", - "/*** eBPF misc features ***/", - define_prefix); - probe_large_insn_limit(define_prefix, ifindex); + section_program_types(supported_types, define_prefix, ifindex); + section_map_types(define_prefix, ifindex); + section_helpers(supported_types, define_prefix, ifindex); + section_misc(define_prefix, ifindex);
exit_close_json: - if (json_output) { - /* End current "section" of probes */ - jsonw_end_object(json_wtr); + if (json_output) /* End root object */ jsonw_end_object(json_wtr); - }
return 0; }