Thread (73 messages) 73 messages, 7 authors, 2022-03-15

Re: [PATCH bpf-next v2 04/28] libbpf: add HID program type and API

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From: Song Liu <song@kernel.org>
Date: 2022-03-05 00:31:31
Also in: bpf, linux-kselftest, lkml, netdev

On Fri, Mar 4, 2022 at 9:31 AM Benjamin Tissoires
[off-list ref] wrote:
HID-bpf program type are needing a new SEC.
To bind a hid-bpf program, we can rely on bpf_program__attach_fd()
so export a new function to the API.

Signed-off-by: Benjamin Tissoires <redacted>
Acked-by: Song Liu <redacted>
quoted hunk ↗ jump to hunk
---

changes in v2:
- split the series by bpf/libbpf/hid/selftests and samples
---
 tools/lib/bpf/libbpf.c   | 7 +++++++
 tools/lib/bpf/libbpf.h   | 2 ++
 tools/lib/bpf/libbpf.map | 1 +
 3 files changed, 10 insertions(+)
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 81bf01d67671..356bbd3ad2c7 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -8680,6 +8680,7 @@ static const struct bpf_sec_def section_defs[] = {
        SEC_DEF("cgroup/setsockopt",    CGROUP_SOCKOPT, BPF_CGROUP_SETSOCKOPT, SEC_ATTACHABLE | SEC_SLOPPY_PFX),
        SEC_DEF("struct_ops+",          STRUCT_OPS, 0, SEC_NONE),
        SEC_DEF("sk_lookup",            SK_LOOKUP, BPF_SK_LOOKUP, SEC_ATTACHABLE | SEC_SLOPPY_PFX),
+       SEC_DEF("hid/device_event",     HID, BPF_HID_DEVICE_EVENT, SEC_ATTACHABLE_OPT | SEC_SLOPPY_PFX),
 };

 #define MAX_TYPE_NAME_SIZE 32
@@ -10659,6 +10660,12 @@ static struct bpf_link *attach_iter(const struct bpf_program *prog, long cookie)
        return bpf_program__attach_iter(prog, NULL);
 }

+struct bpf_link *
+bpf_program__attach_hid(const struct bpf_program *prog, int hid_fd)
+{
+       return bpf_program__attach_fd(prog, hid_fd, 0, "hid");
+}
+
 struct bpf_link *bpf_program__attach(const struct bpf_program *prog)
 {
        if (!prog->sec_def || !prog->sec_def->attach_fn)
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index c8d8daad212e..f677ac0a9ede 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -529,6 +529,8 @@ struct bpf_iter_attach_opts {
 LIBBPF_API struct bpf_link *
 bpf_program__attach_iter(const struct bpf_program *prog,
                         const struct bpf_iter_attach_opts *opts);
+LIBBPF_API struct bpf_link *
+bpf_program__attach_hid(const struct bpf_program *prog, int hid_fd);

 /*
  * Libbpf allows callers to adjust BPF programs before being loaded
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index 47e70c9058d9..fdc6fa743953 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -424,6 +424,7 @@ LIBBPF_0.6.0 {
 LIBBPF_0.7.0 {
        global:
                bpf_btf_load;
+               bpf_program__attach_hid;
                bpf_program__expected_attach_type;
                bpf_program__log_buf;
                bpf_program__log_level;
--
2.35.1
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