diff mbox series

[PATCHv3,bpf-next,14/26] libbpf: Add support for u[ret]probe.multi[.s] program sections

Message ID 20230630083344.984305-15-jolsa@kernel.org (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series bpf: Add multi uprobe link | expand

Checks

Context Check Description
netdev/series_format fail Series longer than 15 patches (and no cover letter)
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 8 this patch: 8
netdev/cc_maintainers warning 3 maintainers not CCed: kpsingh@kernel.org martin.lau@linux.dev song@kernel.org
netdev/build_clang fail Errors and warnings before: 18 this patch: 18
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 8 this patch: 8
netdev/checkpatch warning WARNING: Missing a blank line after declarations WARNING: line length of 100 exceeds 80 columns WARNING: line length of 103 exceeds 80 columns WARNING: line length of 108 exceeds 80 columns WARNING: line length of 93 exceeds 80 columns WARNING: line length of 97 exceeds 80 columns WARNING: line length of 98 exceeds 80 columns WARNING: line length of 99 exceeds 80 columns
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
bpf/vmtest-bpf-next-PR success PR summary
bpf/vmtest-bpf-next-VM_Test-1 success Logs for ${{ matrix.test }} on ${{ matrix.arch }} with ${{ matrix.toolchain_full }}
bpf/vmtest-bpf-next-VM_Test-2 success Logs for ShellCheck
bpf/vmtest-bpf-next-VM_Test-3 success Logs for build for aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-4 success Logs for build for s390x with gcc
bpf/vmtest-bpf-next-VM_Test-5 success Logs for build for x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-6 fail Logs for build for x86_64 with llvm-16
bpf/vmtest-bpf-next-VM_Test-7 success Logs for set-matrix
bpf/vmtest-bpf-next-VM_Test-8 success Logs for veristat

Commit Message

Jiri Olsa June 30, 2023, 8:33 a.m. UTC 
Adding support for several uprobe_multi program sections
to allow auto attach of multi_uprobe programs.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/lib/bpf/libbpf.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

Comments

Andrii Nakryiko July 7, 2023, 4:07 a.m. UTC | #1 
On Fri, Jun 30, 2023 at 1:36 AM Jiri Olsa <jolsa@kernel.org> wrote:
>
> Adding support for several uprobe_multi program sections
> to allow auto attach of multi_uprobe programs.
>
> Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> ---
>  tools/lib/bpf/libbpf.c | 36 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 36 insertions(+)
>

LGTM

Acked-by: Andrii Nakryiko <andrii@kernel.org>

> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index b942f248038e..06092b9752f1 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -8654,6 +8654,7 @@ static int attach_tp(const struct bpf_program *prog, long cookie, struct bpf_lin
>  static int attach_raw_tp(const struct bpf_program *prog, long cookie, struct bpf_link **link);
>  static int attach_trace(const struct bpf_program *prog, long cookie, struct bpf_link **link);
>  static int attach_kprobe_multi(const struct bpf_program *prog, long cookie, struct bpf_link **link);
> +static int attach_uprobe_multi(const struct bpf_program *prog, long cookie, struct bpf_link **link);
>  static int attach_lsm(const struct bpf_program *prog, long cookie, struct bpf_link **link);
>  static int attach_iter(const struct bpf_program *prog, long cookie, struct bpf_link **link);
>
> @@ -8669,6 +8670,10 @@ static const struct bpf_sec_def section_defs[] = {
>         SEC_DEF("uretprobe.s+",         KPROBE, 0, SEC_SLEEPABLE, attach_uprobe),
>         SEC_DEF("kprobe.multi+",        KPROBE, BPF_TRACE_KPROBE_MULTI, SEC_NONE, attach_kprobe_multi),
>         SEC_DEF("kretprobe.multi+",     KPROBE, BPF_TRACE_KPROBE_MULTI, SEC_NONE, attach_kprobe_multi),
> +       SEC_DEF("uprobe.multi+",        KPROBE, BPF_TRACE_UPROBE_MULTI, SEC_NONE, attach_uprobe_multi),
> +       SEC_DEF("uretprobe.multi+",     KPROBE, BPF_TRACE_UPROBE_MULTI, SEC_NONE, attach_uprobe_multi),
> +       SEC_DEF("uprobe.multi.s+",      KPROBE, BPF_TRACE_UPROBE_MULTI, SEC_SLEEPABLE, attach_uprobe_multi),
> +       SEC_DEF("uretprobe.multi.s+",   KPROBE, BPF_TRACE_UPROBE_MULTI, SEC_SLEEPABLE, attach_uprobe_multi),
>         SEC_DEF("ksyscall+",            KPROBE, 0, SEC_NONE, attach_ksyscall),
>         SEC_DEF("kretsyscall+",         KPROBE, 0, SEC_NONE, attach_ksyscall),
>         SEC_DEF("usdt+",                KPROBE, 0, SEC_NONE, attach_usdt),
> @@ -10730,6 +10735,37 @@ static int attach_kprobe_multi(const struct bpf_program *prog, long cookie, stru
>         return libbpf_get_error(*link);
>  }
>
> +static int attach_uprobe_multi(const struct bpf_program *prog, long cookie, struct bpf_link **link)
> +{
> +       char *probe_type = NULL, *binary_path = NULL, *func_name = NULL;
> +       LIBBPF_OPTS(bpf_uprobe_multi_opts, opts);
> +       int n, ret = -EINVAL;
> +
> +       *link = NULL;
> +
> +       n = sscanf(prog->sec_name, "%m[^/]/%m[^:]:%ms",
> +                  &probe_type, &binary_path, &func_name);
> +       switch (n) {
> +       case 1:
> +               /* handle SEC("u[ret]probe") - format is valid, but auto-attach is impossible. */
> +               ret = 0;
> +               break;
> +       case 3:
> +               opts.retprobe = strcmp(probe_type, "uretprobe.multi") == 0;
> +               *link = bpf_program__attach_uprobe_multi(prog, -1, binary_path, func_name, &opts);
> +               ret = libbpf_get_error(*link);
> +               break;
> +       default:
> +               pr_warn("prog '%s': invalid format of section definition '%s'\n", prog->name,
> +                       prog->sec_name);
> +               break;
> +       }
> +       free(probe_type);
> +       free(binary_path);
> +       free(func_name);
> +       return ret;
> +}
> +
>  static void gen_uprobe_legacy_event_name(char *buf, size_t buf_sz,
>                                          const char *binary_path, uint64_t offset)
>  {
> --
> 2.41.0
>
diff mbox series

Patch

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index b942f248038e..06092b9752f1 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -8654,6 +8654,7 @@  static int attach_tp(const struct bpf_program *prog, long cookie, struct bpf_lin
 static int attach_raw_tp(const struct bpf_program *prog, long cookie, struct bpf_link **link);
 static int attach_trace(const struct bpf_program *prog, long cookie, struct bpf_link **link);
 static int attach_kprobe_multi(const struct bpf_program *prog, long cookie, struct bpf_link **link);
+static int attach_uprobe_multi(const struct bpf_program *prog, long cookie, struct bpf_link **link);
 static int attach_lsm(const struct bpf_program *prog, long cookie, struct bpf_link **link);
 static int attach_iter(const struct bpf_program *prog, long cookie, struct bpf_link **link);
 
@@ -8669,6 +8670,10 @@  static const struct bpf_sec_def section_defs[] = {
 	SEC_DEF("uretprobe.s+",		KPROBE, 0, SEC_SLEEPABLE, attach_uprobe),
 	SEC_DEF("kprobe.multi+",	KPROBE,	BPF_TRACE_KPROBE_MULTI, SEC_NONE, attach_kprobe_multi),
 	SEC_DEF("kretprobe.multi+",	KPROBE,	BPF_TRACE_KPROBE_MULTI, SEC_NONE, attach_kprobe_multi),
+	SEC_DEF("uprobe.multi+",	KPROBE,	BPF_TRACE_UPROBE_MULTI, SEC_NONE, attach_uprobe_multi),
+	SEC_DEF("uretprobe.multi+",	KPROBE,	BPF_TRACE_UPROBE_MULTI, SEC_NONE, attach_uprobe_multi),
+	SEC_DEF("uprobe.multi.s+",	KPROBE,	BPF_TRACE_UPROBE_MULTI, SEC_SLEEPABLE, attach_uprobe_multi),
+	SEC_DEF("uretprobe.multi.s+",	KPROBE,	BPF_TRACE_UPROBE_MULTI, SEC_SLEEPABLE, attach_uprobe_multi),
 	SEC_DEF("ksyscall+",		KPROBE,	0, SEC_NONE, attach_ksyscall),
 	SEC_DEF("kretsyscall+",		KPROBE, 0, SEC_NONE, attach_ksyscall),
 	SEC_DEF("usdt+",		KPROBE,	0, SEC_NONE, attach_usdt),
@@ -10730,6 +10735,37 @@  static int attach_kprobe_multi(const struct bpf_program *prog, long cookie, stru
 	return libbpf_get_error(*link);
 }
 
+static int attach_uprobe_multi(const struct bpf_program *prog, long cookie, struct bpf_link **link)
+{
+	char *probe_type = NULL, *binary_path = NULL, *func_name = NULL;
+	LIBBPF_OPTS(bpf_uprobe_multi_opts, opts);
+	int n, ret = -EINVAL;
+
+	*link = NULL;
+
+	n = sscanf(prog->sec_name, "%m[^/]/%m[^:]:%ms",
+		   &probe_type, &binary_path, &func_name);
+	switch (n) {
+	case 1:
+		/* handle SEC("u[ret]probe") - format is valid, but auto-attach is impossible. */
+		ret = 0;
+		break;
+	case 3:
+		opts.retprobe = strcmp(probe_type, "uretprobe.multi") == 0;
+		*link = bpf_program__attach_uprobe_multi(prog, -1, binary_path, func_name, &opts);
+		ret = libbpf_get_error(*link);
+		break;
+	default:
+		pr_warn("prog '%s': invalid format of section definition '%s'\n", prog->name,
+			prog->sec_name);
+		break;
+	}
+	free(probe_type);
+	free(binary_path);
+	free(func_name);
+	return ret;
+}
+
 static void gen_uprobe_legacy_event_name(char *buf, size_t buf_sz,
 					 const char *binary_path, uint64_t offset)
 {