2019-09-10 13:21:39

by KP Singh

Subject: [RFC v1 04/14] krsi: Add support in libbpf for BPF_PROG_TYPE_KRSI

From: KP Singh <[email protected]>

Update the libbpf library with functionality to load and
attach a program type BPF_PROG_TYPE_KRSI.

Since the bpf_prog_load does not allow the specification of an
expected attach type, it's recommended to use bpf_prog_load_xattr and
set the expected attach type as KRSI.

Signed-off-by: KP Singh <[email protected]>
---
tools/lib/bpf/libbpf.c | 4 ++++
tools/lib/bpf/libbpf.h | 2 ++
tools/lib/bpf/libbpf.map | 2 ++
tools/lib/bpf/libbpf_probes.c | 1 +
4 files changed, 9 insertions(+)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 2b57d7ea7836..3cc86bbc68cd 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -2676,6 +2676,7 @@ static bool bpf_prog_type__needs_kver(enum bpf_prog_type type)
case BPF_PROG_TYPE_PERF_EVENT:
case BPF_PROG_TYPE_CGROUP_SYSCTL:
case BPF_PROG_TYPE_CGROUP_SOCKOPT:
+ case BPF_PROG_TYPE_KRSI:
return false;
case BPF_PROG_TYPE_KPROBE:
default:
@@ -3536,6 +3537,7 @@ bool bpf_program__is_##NAME(const struct bpf_program *prog) \
} \

BPF_PROG_TYPE_FNS(socket_filter, BPF_PROG_TYPE_SOCKET_FILTER);
+BPF_PROG_TYPE_FNS(krsi, BPF_PROG_TYPE_KRSI);
BPF_PROG_TYPE_FNS(kprobe, BPF_PROG_TYPE_KPROBE);
BPF_PROG_TYPE_FNS(sched_cls, BPF_PROG_TYPE_SCHED_CLS);
BPF_PROG_TYPE_FNS(sched_act, BPF_PROG_TYPE_SCHED_ACT);
@@ -3590,6 +3592,8 @@ static const struct {
BPF_PROG_SEC("lwt_out", BPF_PROG_TYPE_LWT_OUT),
BPF_PROG_SEC("lwt_xmit", BPF_PROG_TYPE_LWT_XMIT),
BPF_PROG_SEC("lwt_seg6local", BPF_PROG_TYPE_LWT_SEG6LOCAL),
+ BPF_APROG_SEC("krsi", BPF_PROG_TYPE_KRSI,
+ BPF_KRSI),
BPF_APROG_SEC("cgroup_skb/ingress", BPF_PROG_TYPE_CGROUP_SKB,
BPF_CGROUP_INET_INGRESS),
BPF_APROG_SEC("cgroup_skb/egress", BPF_PROG_TYPE_CGROUP_SKB,
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index 5cbf459ece0b..8781d29b4035 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -261,6 +261,7 @@ LIBBPF_API int bpf_program__set_sched_cls(struct bpf_program *prog);
LIBBPF_API int bpf_program__set_sched_act(struct bpf_program *prog);
LIBBPF_API int bpf_program__set_xdp(struct bpf_program *prog);
LIBBPF_API int bpf_program__set_perf_event(struct bpf_program *prog);
+LIBBPF_API int bpf_program__set_krsi(struct bpf_program *prog);
LIBBPF_API void bpf_program__set_type(struct bpf_program *prog,
enum bpf_prog_type type);
LIBBPF_API void
@@ -275,6 +276,7 @@ LIBBPF_API bool bpf_program__is_sched_cls(const struct bpf_program *prog);
LIBBPF_API bool bpf_program__is_sched_act(const struct bpf_program *prog);
LIBBPF_API bool bpf_program__is_xdp(const struct bpf_program *prog);
LIBBPF_API bool bpf_program__is_perf_event(const struct bpf_program *prog);
+LIBBPF_API bool bpf_program__is_krsi(const struct bpf_program *prog);

/*
* No need for __attribute__((packed)), all members of 'bpf_map_def'
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index f9d316e873d8..75b8fe419c11 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -68,6 +68,7 @@ LIBBPF_0.0.1 {
bpf_prog_test_run_xattr;
bpf_program__fd;
bpf_program__is_kprobe;
+ bpf_program__is_krsi;
bpf_program__is_perf_event;
bpf_program__is_raw_tracepoint;
bpf_program__is_sched_act;
@@ -85,6 +86,7 @@ LIBBPF_0.0.1 {
bpf_program__set_expected_attach_type;
bpf_program__set_ifindex;
bpf_program__set_kprobe;
+ bpf_program__set_krsi;
bpf_program__set_perf_event;
bpf_program__set_prep;
bpf_program__set_priv;
diff --git a/tools/lib/bpf/libbpf_probes.c b/tools/lib/bpf/libbpf_probes.c
index ace1a0708d99..cc515a36794d 100644
--- a/tools/lib/bpf/libbpf_probes.c
+++ b/tools/lib/bpf/libbpf_probes.c
@@ -102,6 +102,7 @@ probe_load(enum bpf_prog_type prog_type, const struct bpf_insn *insns,
case BPF_PROG_TYPE_FLOW_DISSECTOR:
case BPF_PROG_TYPE_CGROUP_SYSCTL:
case BPF_PROG_TYPE_CGROUP_SOCKOPT:
+ case BPF_PROG_TYPE_KRSI:
default:
break;
}
--
2.20.1

2019-09-14 21:14:58

by Yonghong Song

Subject: Re: [RFC v1 04/14] krsi: Add support in libbpf for BPF_PROG_TYPE_KRSI

On 9/10/19 12:55 PM, KP Singh wrote:
> From: KP Singh <[email protected]>
>
> Update the libbpf library with functionality to load and
> attach a program type BPF_PROG_TYPE_KRSI.
>
> Since the bpf_prog_load does not allow the specification of an
> expected attach type, it's recommended to use bpf_prog_load_xattr and
> set the expected attach type as KRSI.
>
> Signed-off-by: KP Singh <[email protected]>
> ---
> tools/lib/bpf/libbpf.c | 4 ++++
> tools/lib/bpf/libbpf.h | 2 ++
> tools/lib/bpf/libbpf.map | 2 ++
> tools/lib/bpf/libbpf_probes.c | 1 +
> 4 files changed, 9 insertions(+)
>
> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index 2b57d7ea7836..3cc86bbc68cd 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -2676,6 +2676,7 @@ static bool bpf_prog_type__needs_kver(enum bpf_prog_type type)
> case BPF_PROG_TYPE_PERF_EVENT:
> case BPF_PROG_TYPE_CGROUP_SYSCTL:
> case BPF_PROG_TYPE_CGROUP_SOCKOPT:
> + case BPF_PROG_TYPE_KRSI:
> return false;
> case BPF_PROG_TYPE_KPROBE:
> default:
> @@ -3536,6 +3537,7 @@ bool bpf_program__is_##NAME(const struct bpf_program *prog) \
> } \
>
> BPF_PROG_TYPE_FNS(socket_filter, BPF_PROG_TYPE_SOCKET_FILTER);
> +BPF_PROG_TYPE_FNS(krsi, BPF_PROG_TYPE_KRSI);
> BPF_PROG_TYPE_FNS(kprobe, BPF_PROG_TYPE_KPROBE);
> BPF_PROG_TYPE_FNS(sched_cls, BPF_PROG_TYPE_SCHED_CLS);
> BPF_PROG_TYPE_FNS(sched_act, BPF_PROG_TYPE_SCHED_ACT);
> @@ -3590,6 +3592,8 @@ static const struct {
> BPF_PROG_SEC("lwt_out", BPF_PROG_TYPE_LWT_OUT),
> BPF_PROG_SEC("lwt_xmit", BPF_PROG_TYPE_LWT_XMIT),
> BPF_PROG_SEC("lwt_seg6local", BPF_PROG_TYPE_LWT_SEG6LOCAL),
> + BPF_APROG_SEC("krsi", BPF_PROG_TYPE_KRSI,
> + BPF_KRSI),
> BPF_APROG_SEC("cgroup_skb/ingress", BPF_PROG_TYPE_CGROUP_SKB,
> BPF_CGROUP_INET_INGRESS),
> BPF_APROG_SEC("cgroup_skb/egress", BPF_PROG_TYPE_CGROUP_SKB,
> diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
> index 5cbf459ece0b..8781d29b4035 100644
> --- a/tools/lib/bpf/libbpf.h
> +++ b/tools/lib/bpf/libbpf.h
> @@ -261,6 +261,7 @@ LIBBPF_API int bpf_program__set_sched_cls(struct bpf_program *prog);
> LIBBPF_API int bpf_program__set_sched_act(struct bpf_program *prog);
> LIBBPF_API int bpf_program__set_xdp(struct bpf_program *prog);
> LIBBPF_API int bpf_program__set_perf_event(struct bpf_program *prog);
> +LIBBPF_API int bpf_program__set_krsi(struct bpf_program *prog);
> LIBBPF_API void bpf_program__set_type(struct bpf_program *prog,
> enum bpf_prog_type type);
> LIBBPF_API void
> @@ -275,6 +276,7 @@ LIBBPF_API bool bpf_program__is_sched_cls(const struct bpf_program *prog);
> LIBBPF_API bool bpf_program__is_sched_act(const struct bpf_program *prog);
> LIBBPF_API bool bpf_program__is_xdp(const struct bpf_program *prog);
> LIBBPF_API bool bpf_program__is_perf_event(const struct bpf_program *prog);
> +LIBBPF_API bool bpf_program__is_krsi(const struct bpf_program *prog);
>
> /*
> * No need for __attribute__((packed)), all members of 'bpf_map_def'
> diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
> index f9d316e873d8..75b8fe419c11 100644
> --- a/tools/lib/bpf/libbpf.map
> +++ b/tools/lib/bpf/libbpf.map
> @@ -68,6 +68,7 @@ LIBBPF_0.0.1 {
> bpf_prog_test_run_xattr;
> bpf_program__fd;
> bpf_program__is_kprobe;
> + bpf_program__is_krsi;
> bpf_program__is_perf_event;
> bpf_program__is_raw_tracepoint;
> bpf_program__is_sched_act;
> @@ -85,6 +86,7 @@ LIBBPF_0.0.1 {
> bpf_program__set_expected_attach_type;
> bpf_program__set_ifindex;
> bpf_program__set_kprobe;
> + bpf_program__set_krsi;
> bpf_program__set_perf_event;
> bpf_program__set_prep;
> bpf_program__set_priv;

Please put the above two new API functions in version LIBBPF_0.0.5.

> diff --git a/tools/lib/bpf/libbpf_probes.c b/tools/lib/bpf/libbpf_probes.c
> index ace1a0708d99..cc515a36794d 100644
> --- a/tools/lib/bpf/libbpf_probes.c
> +++ b/tools/lib/bpf/libbpf_probes.c
> @@ -102,6 +102,7 @@ probe_load(enum bpf_prog_type prog_type, const struct bpf_insn *insns,
> case BPF_PROG_TYPE_FLOW_DISSECTOR:
> case BPF_PROG_TYPE_CGROUP_SYSCTL:
> case BPF_PROG_TYPE_CGROUP_SOCKOPT:
> + case BPF_PROG_TYPE_KRSI:
> default:
> break;
> }
>