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From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Pavel Begunkov <asml.silence@gmail.com>
Cc: io-uring@vger.kernel.org, Networking <netdev@vger.kernel.org>,
	bpf <bpf@vger.kernel.org>,
	open list <linux-kernel@vger.kernel.org>,
	Jens Axboe <axboe@kernel.dk>, Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Andrii Nakryiko <andrii@kernel.org>,
	Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
	Yonghong Song <yhs@fb.com>,
	John Fastabend <john.fastabend@gmail.com>,
	KP Singh <kpsingh@kernel.org>,
	Horst Schirmeier <horst.schirmeier@tu-dortmund.de>,
	"Franz-B . Tuneke" <franz-bernhard.tuneke@tu-dortmund.de>,
	Christian Dietrich <stettberger@dokucode.de>
Subject: Re: [PATCH 18/23] libbpf: support io_uring
Date: Thu, 20 May 2021 10:23:01 -0700	[thread overview]
Message-ID: <CAEf4BzbLPxNo--P7mCxS_miagFHF4fyoec1VOkpL=uY=oNqpVg@mail.gmail.com> (raw)
In-Reply-To: <d86035d9-66f0-de37-42ef-8eaa4d849651@gmail.com>

On Thu, May 20, 2021 at 2:58 AM Pavel Begunkov <asml.silence@gmail.com> wrote:
>
> On 5/19/21 6:38 PM, Andrii Nakryiko wrote:
> > On Wed, May 19, 2021 at 7:14 AM Pavel Begunkov <asml.silence@gmail.com> wrote:
> >>
> >> Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
> >> ---
> >>  tools/lib/bpf/libbpf.c | 7 +++++++
> >>  1 file changed, 7 insertions(+)
> >>
> >> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> >> index 4181d178ee7b..de5d1508f58e 100644
> >> --- a/tools/lib/bpf/libbpf.c
> >> +++ b/tools/lib/bpf/libbpf.c
> >> @@ -13,6 +13,10 @@
> >>  #ifndef _GNU_SOURCE
> >>  #define _GNU_SOURCE
> >>  #endif
> >> +
> >> +/* hack, use local headers instead of system-wide */
> >> +#include "../../../include/uapi/linux/bpf.h"
> >> +
> >
> > libbpf is already using the latest UAPI headers, so you don't need
> > this hack. You just haven't synced include/uapi/linux/bpf.h into
> > tools/include/uapi/linux/bpf.h
>
> It's more convenient to keep it local to me while RFC, surely will
> drop it later.
>
> btw, I had a problem with find_sec_def() successfully matching
> "iouring.s" string with "iouring", because section_defs[i].len
> doesn't include final \0 and so does a sort of prefix comparison.
> That's why "iouring/". Can we fix it? Are compatibility concerns?

If you put "iouring.s" before "iouring" it will be matched first,
libbpf matches them in order, so more specific prefix should go first.
It is currently always treated as a prefix, not exact match,
unfortunately. I have a work planned to revamp this logic quite a bit
for libbpf 1.0, so this should be improved as part of that work.



>
> >
> >>  #include <stdlib.h>
> >>  #include <stdio.h>
> >>  #include <stdarg.h>
> >> @@ -8630,6 +8634,9 @@ static const struct bpf_sec_def section_defs[] = {
> >>         BPF_PROG_SEC("struct_ops",              BPF_PROG_TYPE_STRUCT_OPS),
> >>         BPF_EAPROG_SEC("sk_lookup/",            BPF_PROG_TYPE_SK_LOOKUP,
> >>                                                 BPF_SK_LOOKUP),
> >> +       SEC_DEF("iouring/",                     IOURING),
> >> +       SEC_DEF("iouring.s/",                   IOURING,
> >> +               .is_sleepable = true),
> >>  };
> >>
> >>  #undef BPF_PROG_SEC_IMPL
> >> --
> >> 2.31.1
> >>
>
> --
> Pavel Begunkov

  reply	other threads:[~2021-05-20 17:23 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-19 14:13 [RFC v2 00/23] io_uring BPF requests Pavel Begunkov
2021-05-19 14:13 ` [PATCH 01/23] io_uring: shuffle rarely used ctx fields Pavel Begunkov
2021-05-20 21:46   ` Song Liu
2021-05-20 22:46     ` Pavel Begunkov
2021-05-19 14:13 ` [PATCH 02/23] io_uring: localise fixed resources fields Pavel Begunkov
2021-05-19 14:13 ` [PATCH 03/23] io_uring: remove dependency on ring->sq/cq_entries Pavel Begunkov
2021-05-19 14:13 ` [PATCH 04/23] io_uring: deduce cq_mask from cq_entries Pavel Begunkov
2021-05-19 14:13 ` [PATCH 05/23] io_uring: kill cached_cq_overflow Pavel Begunkov
2021-05-19 14:13 ` [PATCH 06/23] io_uring: rename io_get_cqring Pavel Begunkov
2021-05-19 14:13 ` [PATCH 07/23] io_uring: extract struct for CQ Pavel Begunkov
2021-05-19 14:13 ` [PATCH 08/23] io_uring: internally pass CQ indexes Pavel Begunkov
2021-05-19 14:13 ` [PATCH 09/23] io_uring: extract cq size helper Pavel Begunkov
2021-05-19 14:13 ` [PATCH 10/23] io_uring: add support for multiple CQs Pavel Begunkov
2021-05-19 14:13 ` [PATCH 11/23] io_uring: enable mmap'ing additional CQs Pavel Begunkov
2021-05-19 14:13 ` [PATCH 12/23] bpf: add IOURING program type Pavel Begunkov
2021-05-20 23:34   ` Song Liu
2021-05-21  0:56     ` Pavel Begunkov
2021-05-19 14:13 ` [PATCH 13/23] io_uring: implement bpf prog registration Pavel Begunkov
2021-05-20 23:45   ` Song Liu
2021-05-21  0:43     ` Pavel Begunkov
2021-05-19 14:13 ` [PATCH 14/23] io_uring: add support for bpf requests Pavel Begunkov
2021-05-21  0:42   ` Pavel Begunkov
2021-05-19 14:13 ` [PATCH 15/23] io_uring: enable BPF to submit SQEs Pavel Begunkov
2021-05-21  0:06   ` Song Liu
2021-05-21  1:07   ` Alexei Starovoitov
2021-05-21  9:33     ` Pavel Begunkov
2021-05-19 14:13 ` [PATCH 16/23] io_uring: enable bpf to submit CQEs Pavel Begunkov
2021-05-19 14:13 ` [PATCH 17/23] io_uring: enable bpf to reap CQEs Pavel Begunkov
2021-05-19 14:13 ` [PATCH 18/23] libbpf: support io_uring Pavel Begunkov
2021-05-19 17:38   ` Andrii Nakryiko
2021-05-20  9:58     ` Pavel Begunkov
2021-05-20 17:23       ` Andrii Nakryiko [this message]
2021-05-19 14:13 ` [PATCH 19/23] io_uring: pass user_data to bpf executor Pavel Begunkov
2021-05-19 14:13 ` [PATCH 20/23] bpf: Add bpf_copy_to_user() helper Pavel Begunkov
2021-05-19 14:13 ` [PATCH 21/23] io_uring: wire bpf copy to user Pavel Begunkov
2021-05-19 14:13 ` [PATCH 22/23] io_uring: don't wait on CQ exclusively Pavel Begunkov
2021-05-19 14:13 ` [PATCH 23/23] io_uring: enable bpf reqs to wait for CQs Pavel Begunkov
2021-05-21  0:35 ` [RFC v2 00/23] io_uring BPF requests Song Liu
2021-05-21  0:58   ` Pavel Begunkov

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