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From: Stanislav Fomichev <sdf@google.com>
To: "Toke Høiland-Jørgensen" <toke@redhat.com>
Cc: bpf@vger.kernel.org, ast@kernel.org, daniel@iogearbox.net,
	andrii@kernel.org, martin.lau@linux.dev, song@kernel.org,
	yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org,
	haoluo@google.com, 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, netdev@vger.kernel.org
Subject: [xdp-hints] Re: [PATCH bpf-next v4 05/15] bpf: XDP metadata RX kfuncs
Date: Wed, 14 Dec 2022 10:43:12 -0800	[thread overview]
Message-ID: <CAKH8qBtcmELXh9pHedkmEDTkPJRVNNs3ES218+npC3oYcNpN=Q@mail.gmail.com> (raw)
In-Reply-To: <877cyugsrb.fsf@toke.dk>

On Wed, Dec 14, 2022 at 2:54 AM Toke Høiland-Jørgensen <toke@redhat.com> wrote:
>
> Stanislav Fomichev <sdf@google.com> writes:
>
> [..]
>
> > diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
> > index d434a994ee04..c3e501e3e39c 100644
> > --- a/kernel/bpf/core.c
> > +++ b/kernel/bpf/core.c
> > @@ -2097,6 +2097,13 @@ bool bpf_prog_map_compatible(struct bpf_map *map,
> >       if (fp->kprobe_override)
> >               return false;
> >
> > +     /* When tail-calling from a non-dev-bound program to a dev-bound one,
> > +      * XDP metadata helpers should be disabled. Until it's implemented,
> > +      * prohibit adding dev-bound programs to tail-call maps.
> > +      */
> > +     if (bpf_prog_is_dev_bound(fp->aux))
> > +             return false;
> > +
>
> nit: the comment is slightly inaccurate as the program running in a
> devmap/cpumap has nothing to do with tail calls. maybe replace it with:
>
> "XDP programs inserted into maps are not guaranteed to run on a
> particular netdev (and can run outside driver context entirely in the
> case of devmap and cpumap). Until device checks are implemented,
> prohibit adding dev-bound programs to program maps."

SG.

> Also, there needs to be a check in bpf_prog_test_run_xdp() to reject
> dev-bound programs there as well...

Ah, totally forgot about this part, thanks for reminding!

> -Toke
>

  reply	other threads:[~2022-12-14 18:43 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-12-13  2:35 [xdp-hints] [PATCH bpf-next v4 00/15] xdp: hints via kfuncs Stanislav Fomichev
2022-12-13  2:35 ` [xdp-hints] [PATCH bpf-next v4 01/15] bpf: Document XDP RX metadata Stanislav Fomichev
2022-12-13 16:37   ` [xdp-hints] " David Vernet
2022-12-13 20:42     ` Stanislav Fomichev
2022-12-14 10:34       ` Toke Høiland-Jørgensen
2022-12-14 18:42         ` Stanislav Fomichev
2022-12-14 23:46           ` Toke Høiland-Jørgensen
2022-12-15  3:48             ` Stanislav Fomichev
2022-12-15 14:04               ` Toke Høiland-Jørgensen
2022-12-14 23:46   ` Toke Høiland-Jørgensen
2022-12-17  4:20   ` kernel test robot
2022-12-13  2:35 ` [xdp-hints] [PATCH bpf-next v4 02/15] bpf: Rename bpf_{prog,map}_is_dev_bound to is_offloaded Stanislav Fomichev
2022-12-13  2:35 ` [xdp-hints] [PATCH bpf-next v4 03/15] bpf: Introduce device-bound XDP programs Stanislav Fomichev
2022-12-13 23:25   ` [xdp-hints] " Martin KaFai Lau
2022-12-14 18:42     ` Stanislav Fomichev
2022-12-13  2:35 ` [xdp-hints] [PATCH bpf-next v4 04/15] selftests/bpf: Update expected test_offload.py messages Stanislav Fomichev
2022-12-13  2:35 ` [xdp-hints] [PATCH bpf-next v4 05/15] bpf: XDP metadata RX kfuncs Stanislav Fomichev
2022-12-13 17:00   ` [xdp-hints] " David Vernet
2022-12-13 20:42     ` Stanislav Fomichev
2022-12-13 21:45       ` David Vernet
2022-12-14  1:53   ` Martin KaFai Lau
2022-12-14 18:43     ` Stanislav Fomichev
2022-12-14 10:54   ` Toke Høiland-Jørgensen
2022-12-14 18:43     ` Stanislav Fomichev [this message]
2022-12-13  2:35 ` [xdp-hints] [PATCH bpf-next v4 07/15] veth: Introduce veth_xdp_buff wrapper for xdp_buff Stanislav Fomichev
2022-12-13  2:35 ` [xdp-hints] [PATCH bpf-next v4 08/15] veth: Support RX XDP metadata Stanislav Fomichev
2022-12-13 15:55   ` [xdp-hints] " Jesper Dangaard Brouer
2022-12-13 20:42     ` Stanislav Fomichev
2022-12-14  9:48       ` Jesper Dangaard Brouer
2022-12-14 10:47         ` Toke Høiland-Jørgensen
2022-12-14 18:09           ` Martin KaFai Lau
2022-12-14 18:44             ` Stanislav Fomichev
2022-12-13  2:35 ` [xdp-hints] [PATCH bpf-next v4 09/15] selftests/bpf: Verify xdp_metadata xdp->af_xdp path Stanislav Fomichev
2022-12-13  2:36 ` [xdp-hints] [PATCH bpf-next v4 10/15] net/mlx4_en: Introduce wrapper for xdp_buff Stanislav Fomichev
2022-12-13  8:56   ` [xdp-hints] " Tariq Toukan
2022-12-13  2:36 ` [xdp-hints] [PATCH bpf-next v4 11/15] net/mlx4_en: Support RX XDP metadata Stanislav Fomichev
2022-12-13  8:56   ` [xdp-hints] " Tariq Toukan
2022-12-13  2:36 ` [xdp-hints] [PATCH bpf-next v4 12/15] xsk: Add cb area to struct xdp_buff_xsk Stanislav Fomichev
2022-12-13  2:36 ` [xdp-hints] [PATCH bpf-next v4 13/15] net/mlx5e: Introduce wrapper for xdp_buff Stanislav Fomichev
2022-12-13  2:36 ` [xdp-hints] [PATCH bpf-next v4 14/15] net/mlx5e: Support RX XDP metadata Stanislav Fomichev
2022-12-13  2:36 ` [xdp-hints] [PATCH bpf-next v4 15/15] selftests/bpf: Simple program to dump XDP RX metadata Stanislav Fomichev

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