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From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Stanislav Fomichev <sdf@google.com>
Cc: "Toke Høiland-Jørgensen" <toke@redhat.com>,
	bpf <bpf@vger.kernel.org>, "Alexei Starovoitov" <ast@kernel.org>,
	"Daniel Borkmann" <daniel@iogearbox.net>,
	"Andrii Nakryiko" <andrii@kernel.org>,
	"Martin KaFai Lau" <martin.lau@linux.dev>,
	"Song Liu" <song@kernel.org>, "Yonghong Song" <yhs@fb.com>,
	"John Fastabend" <john.fastabend@gmail.com>,
	"KP Singh" <kpsingh@kernel.org>, "Hao Luo" <haoluo@google.com>,
	"Jiri Olsa" <jolsa@kernel.org>, "David Ahern" <dsahern@gmail.com>,
	"Jakub Kicinski" <kuba@kernel.org>,
	"Willem de Bruijn" <willemb@google.com>,
	"Jesper Dangaard Brouer" <brouer@redhat.com>,
	"Anatoly Burakov" <anatoly.burakov@intel.com>,
	"Alexander Lobakin" <alexandr.lobakin@intel.com>,
	"Magnus Karlsson" <magnus.karlsson@gmail.com>,
	"Maryam Tahhan" <mtahhan@redhat.com>,
	xdp-hints@xdp-project.net,
	"Network Development" <netdev@vger.kernel.org>
Subject: Re: [xdp-hints] [PATCH bpf-next 00/11] xdp: hints via kfuncs
Date: Tue, 15 Nov 2022 14:54:03 -0800	[thread overview]
Message-ID: <CAADnVQKs=2zJ3=3BQp=OfCre3s6zTffjKRK+kbnwpQqvxF9ygA@mail.gmail.com> (raw)
In-Reply-To: <CAKH8qBszV6Ni_k8JYOxtAQ2j79qe5KVryAzDqtb1Ng8+TW=+7A@mail.gmail.com>

On Tue, Nov 15, 2022 at 10:38 AM Stanislav Fomichev <sdf@google.com> wrote:
>
> On Tue, Nov 15, 2022 at 7:54 AM Toke Høiland-Jørgensen <toke@redhat.com> wrote:
> >
> > Stanislav Fomichev <sdf@google.com> writes:
> >
> > > - drop __randomize_layout
> > >
> > >   Not sure it's possible to sanely expose it via UAPI. Because every
> > >   .o potentially gets its own randomized layout, test_progs
> > >   refuses to link.
> >
> > So this won't work if the struct is in a kernel-supplied UAPI header
> > (which would include the __randomize_layout tag). But if it's *not* in a
> > UAPI header it should still be included in a stable form (i.e., without
> > the randomize tag) in vmlinux.h, right? Which would be the point:
> > consumers would be forced to read it from there and do CO-RE on it...
>
> So you're suggesting something like the following in the uapi header?
>
> #ifndef __KERNEL__
> #define __randomize_layout
> #endif
>

1.
__randomize_layout in uapi header makes no sense.

2.
It's supported by gcc plugin and afaik that plugin is broken
vs debug info, so dwarf is broken, hence BTF is broken too,
and CO-RE doesn't work on kernels compiled with that gcc plugin.

  parent reply	other threads:[~2022-11-15 22:54 UTC|newest]

Thread overview: 71+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-15  3:01 [PATCH bpf-next 00/11] xdp: hints via kfuncs Stanislav Fomichev
2022-11-15  3:02 ` [PATCH bpf-next 01/11] bpf: Document XDP RX metadata Stanislav Fomichev
2022-11-15 22:31   ` Zvi Effron
2022-11-15 22:43     ` Stanislav Fomichev
2022-11-15 23:34       ` Zvi Effron
2022-11-16  3:50         ` Stanislav Fomichev
2022-11-15  3:02 ` [PATCH bpf-next 02/11] bpf: Introduce bpf_patch Stanislav Fomichev
2022-11-15  3:02 ` [PATCH bpf-next 03/11] bpf: Support inlined/unrolled kfuncs for xdp metadata Stanislav Fomichev
2022-11-15 16:16   ` [xdp-hints] " Toke Høiland-Jørgensen
2022-11-15 18:37     ` Stanislav Fomichev
2022-11-16 20:42   ` Jakub Kicinski
2022-11-16 20:53     ` Stanislav Fomichev
2022-11-15  3:02 ` [PATCH bpf-next 04/11] bpf: Implement hidden BPF_PUSH64 and BPF_POP64 instructions Stanislav Fomichev
2022-11-15  3:02 ` [PATCH bpf-next 05/11] veth: Support rx timestamp metadata for xdp Stanislav Fomichev
2022-11-15 16:17   ` [xdp-hints] " Toke Høiland-Jørgensen
2022-11-15 18:37     ` Stanislav Fomichev
2022-11-15 22:46       ` [xdp-hints] " Toke Høiland-Jørgensen
2022-11-16  4:09         ` Stanislav Fomichev
2022-11-16  6:38           ` John Fastabend
2022-11-16  7:47             ` Martin KaFai Lau
2022-11-16 10:08               ` Toke Høiland-Jørgensen
2022-11-16 18:20                 ` Martin KaFai Lau
2022-11-16 19:03                 ` John Fastabend
2022-11-16 20:50                   ` Stanislav Fomichev
2022-11-16 23:47                     ` John Fastabend
2022-11-17  0:19                       ` Stanislav Fomichev
2022-11-17  2:17                         ` Alexei Starovoitov
2022-11-17  2:53                           ` Stanislav Fomichev
2022-11-17  2:59                             ` Alexei Starovoitov
2022-11-17  4:18                               ` Stanislav Fomichev
2022-11-17  6:55                                 ` John Fastabend
2022-11-17 17:51                                   ` Stanislav Fomichev
2022-11-17 19:47                                     ` John Fastabend
2022-11-17 20:17                                       ` Alexei Starovoitov
2022-11-17 11:32                             ` Toke Høiland-Jørgensen
2022-11-17 16:59                               ` Alexei Starovoitov
2022-11-17 17:52                                 ` Stanislav Fomichev
2022-11-17 23:46                                   ` Toke Høiland-Jørgensen
2022-11-18  0:02                                     ` Alexei Starovoitov
2022-11-18  0:29                                       ` Toke Høiland-Jørgensen
2022-11-17 10:27                       ` Toke Høiland-Jørgensen
2022-11-15  3:02 ` [PATCH bpf-next 06/11] xdp: Carry over xdp metadata into skb context Stanislav Fomichev
2022-11-15 23:20   ` [xdp-hints] " Toke Høiland-Jørgensen
2022-11-16  3:49     ` Stanislav Fomichev
2022-11-16  9:30       ` [xdp-hints] " Toke Høiland-Jørgensen
2022-11-16  4:40   ` kernel test robot
2022-11-16  7:04   ` Martin KaFai Lau
2022-11-16  9:48     ` [xdp-hints] " Toke Høiland-Jørgensen
2022-11-16 20:51       ` Stanislav Fomichev
2022-11-16 20:51     ` Stanislav Fomichev
2022-11-16  8:22   ` kernel test robot
2022-11-16  9:03   ` kernel test robot
2022-11-16 13:46   ` kernel test robot
2022-11-16 21:12   ` Jakub Kicinski
2022-11-16 21:49     ` Martin KaFai Lau
2022-11-18 14:05   ` Jesper Dangaard Brouer
2022-11-18 18:18     ` Stanislav Fomichev
2022-11-19 12:31       ` [xdp-hints] " Toke Høiland-Jørgensen
2022-11-21 17:53         ` Stanislav Fomichev
2022-11-21 18:47           ` Jakub Kicinski
2022-11-21 19:41             ` Stanislav Fomichev
2022-11-15  3:02 ` [PATCH bpf-next 07/11] selftests/bpf: Verify xdp_metadata xdp->af_xdp path Stanislav Fomichev
2022-11-15  3:02 ` [PATCH bpf-next 08/11] selftests/bpf: Verify xdp_metadata xdp->skb path Stanislav Fomichev
2022-11-15  3:02 ` [PATCH bpf-next 09/11] mlx4: Introduce mlx4_xdp_buff wrapper for xdp_buff Stanislav Fomichev
2022-11-15  3:02 ` [PATCH bpf-next 10/11] mxl4: Support rx timestamp metadata for xdp Stanislav Fomichev
2022-11-15  3:02 ` [PATCH bpf-next 11/11] selftests/bpf: Simple program to dump XDP RX metadata Stanislav Fomichev
2022-11-15 15:54 ` [xdp-hints] [PATCH bpf-next 00/11] xdp: hints via kfuncs Toke Høiland-Jørgensen
2022-11-15 18:37   ` Stanislav Fomichev
2022-11-15 22:31     ` [xdp-hints] " Toke Høiland-Jørgensen
2022-11-15 22:54     ` Alexei Starovoitov [this message]
2022-11-15 23:13       ` Toke Høiland-Jørgensen

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