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From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Ederson de Souza <ederson.desouza@intel.com>
Cc: xdp-hints@xdp-project.net, bpf <bpf@vger.kernel.org>
Subject: Re: [[RFC xdp-hints] 16/16] samples/bpf: Show XDP hints usage
Date: Fri, 6 Aug 2021 16:14:47 -0700	[thread overview]
Message-ID: <CAEf4BzaqUTmVVkU1ANXLg-Dchuvc0DW9-Q1K6nz6uLNqzCRyuw@mail.gmail.com> (raw)
In-Reply-To: <20210803010331.39453-17-ederson.desouza@intel.com>

On Mon, Aug 2, 2021 at 6:05 PM Ederson de Souza
<ederson.desouza@intel.com> wrote:
>
> An example of how to retrieve XDP hints/metadata from an XDP frame. To
> get the xdp_hints struct, one can use:
>
> $ bpftool net xdp show
>   xdp:
>   enp6s0(2) md_btf_id(44) md_btf_enabled(0)
>
> To get the BTF id, and then:
>
> $ bpftool btf dump id 44 format c > btf.h
>
> But, in this example, to demonstrate BTF and CORE features, a simpler
> struct was defined, containing the only field used by the sample.
>
> A lowpoint is that it's not currently possible to use some CORE features
> from "samples/bpf" directory, as those samples are currently built
> without using "clang -target bpf". This way, it was not possible to use
> "bpf_core_field_exists" macro to check, in runtime, the presence of a
> given XDP hints field.
> ---

FYI, Kumar Kartikeya Dwivedi is adding vmlinux.h and CO-RE support to
samples/bpf in [0].

  [0] https://lore.kernel.org/bpf/20210728165552.435050-1-memxor@gmail.com/


>  samples/bpf/xdp_sample_pkts_kern.c | 21 +++++++++++++++++++++
>  samples/bpf/xdp_sample_pkts_user.c |  4 +++-
>  2 files changed, 24 insertions(+), 1 deletion(-)
>

[...]

  reply	other threads:[~2021-08-06 23:14 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-03  1:03 [[RFC xdp-hints] 00/16] XDP hints and AF_XDP support Ederson de Souza
2021-08-03  1:03 ` [[RFC xdp-hints] 01/16] bpf: add btf register/unregister API Ederson de Souza
2021-08-03  1:03 ` [[RFC xdp-hints] 02/16] net/core: XDP metadata BTF netlink API Ederson de Souza
2021-08-03  1:03 ` [[RFC xdp-hints] 03/16] tools/bpf: Query XDP metadata BTF ID Ederson de Souza
2021-08-03  1:03 ` [[RFC xdp-hints] 04/16] tools/bpf: Add xdp set command for md btf Ederson de Souza
2021-08-03  1:03 ` [[RFC xdp-hints] 05/16] igc: Fix race condition in PTP Tx code Ederson de Souza
2021-08-03  1:03 ` [[RFC xdp-hints] 06/16] igc: Retrieve the TX timestamp directly (instead of in a interrupt) Ederson de Souza
2021-08-03  1:03 ` [[RFC xdp-hints] 07/16] igc: Add support for multiple in-flight TX timestamps Ederson de Souza
2021-08-03  1:03 ` [[RFC xdp-hints] 08/16] igc: Use irq safe locks for timestamping Ederson de Souza
2021-08-03  1:03 ` [[RFC xdp-hints] 09/16] net/xdp: Support for generic XDP hints Ederson de Souza
2021-08-03  1:03 ` [[RFC xdp-hints] 10/16] igc: XDP packet RX timestamp Ederson de Souza
2021-08-03  1:03 ` [[RFC xdp-hints] 11/16] igc: XDP packet TX timestamp Ederson de Souza
2021-08-03  1:03 ` [[RFC xdp-hints] 12/16] ethtool,igc: Add "xdp_headroom" driver info Ederson de Souza
2021-08-03  1:03 ` [[RFC xdp-hints] 13/16] libbpf: Helpers to access XDP frame metadata Ederson de Souza
2021-08-06 22:59   ` Andrii Nakryiko
2021-08-19 11:47     ` Toke Høiland-Jørgensen
2021-08-03  1:03 ` [[RFC xdp-hints] 14/16] libbpf: Helpers to access XDP hints based on BTF definitions Ederson de Souza
2021-08-03  1:03 ` [[RFC xdp-hints] 15/16] samples/bpf: XDP hints AF_XDP example Ederson de Souza
2021-08-03  1:03 ` [[RFC xdp-hints] 16/16] samples/bpf: Show XDP hints usage Ederson de Souza
2021-08-06 23:14   ` Andrii Nakryiko [this message]
2021-08-03  9:12 ` [[RFC xdp-hints] 00/16] XDP hints and AF_XDP support Alexander Lobakin
2021-08-03 15:23   ` John Fastabend
2021-08-04 15:15     ` Alexander Lobakin
2021-08-04 23:45       ` John Fastabend
2021-08-13 22:04         ` Desouza, Ederson

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