* [PATCH bpf-next v2] libbpf: Expose libbpf ringbufer epoll_fd
@ 2020-12-14 11:38 Brendan Jackman
2020-12-14 20:46 ` Daniel Borkmann
0 siblings, 1 reply; 5+ messages in thread
From: Brendan Jackman @ 2020-12-14 11:38 UTC (permalink / raw)
To: bpf
Cc: Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, KP Singh,
Florent Revest, linux-kernel, Brendan Jackman
This provides a convenient perf ringbuf -> libbpf ringbuf migration
path for users of external polling systems. It is analogous to
perf_buffer__epoll_fd.
Signed-off-by: Brendan Jackman <jackmanb@google.com>
---
Difference from v1: Added entry to libbpf.map.
tools/lib/bpf/libbpf.h | 1 +
tools/lib/bpf/libbpf.map | 1 +
tools/lib/bpf/ringbuf.c | 6 ++++++
3 files changed, 8 insertions(+)
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index 6909ee81113a..cde07f64771e 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -536,6 +536,7 @@ LIBBPF_API int ring_buffer__add(struct ring_buffer *rb, int map_fd,
ring_buffer_sample_fn sample_cb, void *ctx);
LIBBPF_API int ring_buffer__poll(struct ring_buffer *rb, int timeout_ms);
LIBBPF_API int ring_buffer__consume(struct ring_buffer *rb);
+LIBBPF_API int ring_buffer__epoll_fd(struct ring_buffer *rb);
/* Perf buffer APIs */
struct perf_buffer;
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index 7c4126542e2b..7be850271be6 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -348,4 +348,5 @@ LIBBPF_0.3.0 {
btf__new_split;
xsk_setup_xdp_prog;
xsk_socket__update_xskmap;
+ ring_buffer__epoll_fd;
} LIBBPF_0.2.0;
diff --git a/tools/lib/bpf/ringbuf.c b/tools/lib/bpf/ringbuf.c
index 5c6522c89af1..45a36648b403 100644
--- a/tools/lib/bpf/ringbuf.c
+++ b/tools/lib/bpf/ringbuf.c
@@ -282,3 +282,9 @@ int ring_buffer__poll(struct ring_buffer *rb, int timeout_ms)
}
return cnt < 0 ? -errno : res;
}
+
+/* Get an fd that can be used to sleep until data is available in the ring(s) */
+int ring_buffer__epoll_fd(struct ring_buffer *rb)
+{
+ return rb->epoll_fd;
+}
base-commit: b4fe9fec51ef48011f11c2da4099f0b530449c92
--
2.29.2.576.ga3fc446d84-goog
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH bpf-next v2] libbpf: Expose libbpf ringbufer epoll_fd
2020-12-14 11:38 [PATCH bpf-next v2] libbpf: Expose libbpf ringbufer epoll_fd Brendan Jackman
@ 2020-12-14 20:46 ` Daniel Borkmann
2020-12-15 10:25 ` Brendan Jackman
0 siblings, 1 reply; 5+ messages in thread
From: Daniel Borkmann @ 2020-12-14 20:46 UTC (permalink / raw)
To: Brendan Jackman, bpf
Cc: Alexei Starovoitov, Andrii Nakryiko, KP Singh, Florent Revest,
linux-kernel
On 12/14/20 12:38 PM, Brendan Jackman wrote:
> This provides a convenient perf ringbuf -> libbpf ringbuf migration
> path for users of external polling systems. It is analogous to
> perf_buffer__epoll_fd.
>
> Signed-off-by: Brendan Jackman <jackmanb@google.com>
> ---
> Difference from v1: Added entry to libbpf.map.
>
> tools/lib/bpf/libbpf.h | 1 +
> tools/lib/bpf/libbpf.map | 1 +
> tools/lib/bpf/ringbuf.c | 6 ++++++
> 3 files changed, 8 insertions(+)
>
> diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
> index 6909ee81113a..cde07f64771e 100644
> --- a/tools/lib/bpf/libbpf.h
> +++ b/tools/lib/bpf/libbpf.h
> @@ -536,6 +536,7 @@ LIBBPF_API int ring_buffer__add(struct ring_buffer *rb, int map_fd,
> ring_buffer_sample_fn sample_cb, void *ctx);
> LIBBPF_API int ring_buffer__poll(struct ring_buffer *rb, int timeout_ms);
> LIBBPF_API int ring_buffer__consume(struct ring_buffer *rb);
> +LIBBPF_API int ring_buffer__epoll_fd(struct ring_buffer *rb);
>
> /* Perf buffer APIs */
> struct perf_buffer;
> diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
> index 7c4126542e2b..7be850271be6 100644
> --- a/tools/lib/bpf/libbpf.map
> +++ b/tools/lib/bpf/libbpf.map
> @@ -348,4 +348,5 @@ LIBBPF_0.3.0 {
> btf__new_split;
> xsk_setup_xdp_prog;
> xsk_socket__update_xskmap;
> + ring_buffer__epoll_fd;
Fyi, this had a whitespace issue, Andrii fixed it up while applying.
> } LIBBPF_0.2.0;
> diff --git a/tools/lib/bpf/ringbuf.c b/tools/lib/bpf/ringbuf.c
> index 5c6522c89af1..45a36648b403 100644
> --- a/tools/lib/bpf/ringbuf.c
> +++ b/tools/lib/bpf/ringbuf.c
> @@ -282,3 +282,9 @@ int ring_buffer__poll(struct ring_buffer *rb, int timeout_ms)
> }
> return cnt < 0 ? -errno : res;
> }
> +
> +/* Get an fd that can be used to sleep until data is available in the ring(s) */
> +int ring_buffer__epoll_fd(struct ring_buffer *rb)
> +{
> + return rb->epoll_fd;
> +}
>
> base-commit: b4fe9fec51ef48011f11c2da4099f0b530449c92
> --
> 2.29.2.576.ga3fc446d84-goog
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH bpf-next v2] libbpf: Expose libbpf ringbufer epoll_fd
2020-12-14 20:46 ` Daniel Borkmann
@ 2020-12-15 10:25 ` Brendan Jackman
0 siblings, 0 replies; 5+ messages in thread
From: Brendan Jackman @ 2020-12-15 10:25 UTC (permalink / raw)
To: Daniel Borkmann
Cc: bpf, Alexei Starovoitov, Andrii Nakryiko, KP Singh, Florent Revest, LKML
On Mon, 14 Dec 2020 at 21:46, Daniel Borkmann <daniel@iogearbox.net> wrote:
>
> On 12/14/20 12:38 PM, Brendan Jackman wrote:
[...]
> > diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
> > index 7c4126542e2b..7be850271be6 100644
> > --- a/tools/lib/bpf/libbpf.map
> > +++ b/tools/lib/bpf/libbpf.map
> > @@ -348,4 +348,5 @@ LIBBPF_0.3.0 {
> > btf__new_split;
> > xsk_setup_xdp_prog;
> > xsk_socket__update_xskmap;
> > + ring_buffer__epoll_fd;
>
> Fyi, this had a whitespace issue, Andrii fixed it up while applying.
Sorry about that.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH bpf-next v2] libbpf: Expose libbpf ringbufer epoll_fd
2020-12-15 12:18 ` [PATCH bpf-next v2] libbpf: Expose libbpf ringbufer epoll_fd Brendan Jackman
@ 2020-12-15 18:35 ` Andrii Nakryiko
0 siblings, 0 replies; 5+ messages in thread
From: Andrii Nakryiko @ 2020-12-15 18:35 UTC (permalink / raw)
To: Brendan Jackman
Cc: bpf, Alexei Starovoitov, Daniel Borkmann, KP Singh,
Florent Revest, open list
On Tue, Dec 15, 2020 at 4:18 AM Brendan Jackman <jackmanb@google.com> wrote:
>
> This provides a convenient perf ringbuf -> libbpf ringbuf migration
> path for users of external polling systems. It is analogous to
> perf_buffer__epoll_fd.
>
> Signed-off-by: Brendan Jackman <jackmanb@google.com>
> ---
> Difference from v1: Added entry to libbpf.map.
>
I've already applied this yesterday as a4d2a7ad8683 ("libbpf: Expose
libbpf ring_buffer epoll_fd"), no need to re-send.
> tools/lib/bpf/libbpf.h | 1 +
> tools/lib/bpf/libbpf.map | 1 +
> tools/lib/bpf/ringbuf.c | 6 ++++++
> 3 files changed, 8 insertions(+)
>
> diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
> index 6909ee81113a..cde07f64771e 100644
> --- a/tools/lib/bpf/libbpf.h
> +++ b/tools/lib/bpf/libbpf.h
> @@ -536,6 +536,7 @@ LIBBPF_API int ring_buffer__add(struct ring_buffer *rb, int map_fd,
> ring_buffer_sample_fn sample_cb, void *ctx);
> LIBBPF_API int ring_buffer__poll(struct ring_buffer *rb, int timeout_ms);
> LIBBPF_API int ring_buffer__consume(struct ring_buffer *rb);
> +LIBBPF_API int ring_buffer__epoll_fd(struct ring_buffer *rb);
>
> /* Perf buffer APIs */
> struct perf_buffer;
> diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
> index 7c4126542e2b..7be850271be6 100644
> --- a/tools/lib/bpf/libbpf.map
> +++ b/tools/lib/bpf/libbpf.map
> @@ -348,4 +348,5 @@ LIBBPF_0.3.0 {
> btf__new_split;
> xsk_setup_xdp_prog;
> xsk_socket__update_xskmap;
> + ring_buffer__epoll_fd;
I've put this in the alphabetic order...
> } LIBBPF_0.2.0;
> diff --git a/tools/lib/bpf/ringbuf.c b/tools/lib/bpf/ringbuf.c
> index 5c6522c89af1..45a36648b403 100644
> --- a/tools/lib/bpf/ringbuf.c
> +++ b/tools/lib/bpf/ringbuf.c
> @@ -282,3 +282,9 @@ int ring_buffer__poll(struct ring_buffer *rb, int timeout_ms)
> }
> return cnt < 0 ? -errno : res;
> }
> +
> +/* Get an fd that can be used to sleep until data is available in the ring(s) */
> +int ring_buffer__epoll_fd(struct ring_buffer *rb)
... and also added const here, btw.
> +{
> + return rb->epoll_fd;
> +}
>
> base-commit: b4fe9fec51ef48011f11c2da4099f0b530449c92
> --
> 2.29.2.576.ga3fc446d84-goog
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH bpf-next v2] libbpf: Expose libbpf ringbufer epoll_fd
2020-12-15 12:18 [PATCH bpf-next v4 00/11] Atomics for eBPF Brendan Jackman
@ 2020-12-15 12:18 ` Brendan Jackman
2020-12-15 18:35 ` Andrii Nakryiko
0 siblings, 1 reply; 5+ messages in thread
From: Brendan Jackman @ 2020-12-15 12:18 UTC (permalink / raw)
To: bpf
Cc: Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, KP Singh,
Florent Revest, linux-kernel, Brendan Jackman
This provides a convenient perf ringbuf -> libbpf ringbuf migration
path for users of external polling systems. It is analogous to
perf_buffer__epoll_fd.
Signed-off-by: Brendan Jackman <jackmanb@google.com>
---
Difference from v1: Added entry to libbpf.map.
tools/lib/bpf/libbpf.h | 1 +
tools/lib/bpf/libbpf.map | 1 +
tools/lib/bpf/ringbuf.c | 6 ++++++
3 files changed, 8 insertions(+)
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index 6909ee81113a..cde07f64771e 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -536,6 +536,7 @@ LIBBPF_API int ring_buffer__add(struct ring_buffer *rb, int map_fd,
ring_buffer_sample_fn sample_cb, void *ctx);
LIBBPF_API int ring_buffer__poll(struct ring_buffer *rb, int timeout_ms);
LIBBPF_API int ring_buffer__consume(struct ring_buffer *rb);
+LIBBPF_API int ring_buffer__epoll_fd(struct ring_buffer *rb);
/* Perf buffer APIs */
struct perf_buffer;
diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
index 7c4126542e2b..7be850271be6 100644
--- a/tools/lib/bpf/libbpf.map
+++ b/tools/lib/bpf/libbpf.map
@@ -348,4 +348,5 @@ LIBBPF_0.3.0 {
btf__new_split;
xsk_setup_xdp_prog;
xsk_socket__update_xskmap;
+ ring_buffer__epoll_fd;
} LIBBPF_0.2.0;
diff --git a/tools/lib/bpf/ringbuf.c b/tools/lib/bpf/ringbuf.c
index 5c6522c89af1..45a36648b403 100644
--- a/tools/lib/bpf/ringbuf.c
+++ b/tools/lib/bpf/ringbuf.c
@@ -282,3 +282,9 @@ int ring_buffer__poll(struct ring_buffer *rb, int timeout_ms)
}
return cnt < 0 ? -errno : res;
}
+
+/* Get an fd that can be used to sleep until data is available in the ring(s) */
+int ring_buffer__epoll_fd(struct ring_buffer *rb)
+{
+ return rb->epoll_fd;
+}
base-commit: b4fe9fec51ef48011f11c2da4099f0b530449c92
--
2.29.2.576.ga3fc446d84-goog
^ permalink raw reply related [flat|nested] 5+ messages in thread
end of thread, other threads:[~2020-12-15 18:36 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2020-12-14 11:38 [PATCH bpf-next v2] libbpf: Expose libbpf ringbufer epoll_fd Brendan Jackman
2020-12-14 20:46 ` Daniel Borkmann
2020-12-15 10:25 ` Brendan Jackman
2020-12-15 12:18 [PATCH bpf-next v4 00/11] Atomics for eBPF Brendan Jackman
2020-12-15 12:18 ` [PATCH bpf-next v2] libbpf: Expose libbpf ringbufer epoll_fd Brendan Jackman
2020-12-15 18:35 ` Andrii Nakryiko
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