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From: "Toke Høiland-Jørgensen" <toke@redhat.com>
To: Stanislav Fomichev <sdf@google.com>, bpf@vger.kernel.org
Cc: 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, sdf@google.com,
	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: Re: [xdp-hints] [PATCH bpf-next v4 05/15] bpf: XDP metadata RX kfuncs
Date: Wed, 14 Dec 2022 11:54:32 +0100	[thread overview]
Message-ID: <877cyugsrb.fsf@toke.dk> (raw)
In-Reply-To: <20221213023605.737383-6-sdf@google.com>

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."

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

-Toke


  parent reply	other threads:[~2022-12-14 10:55 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-12-13  2:35 [PATCH bpf-next v4 00/15] xdp: hints via kfuncs Stanislav Fomichev
2022-12-13  2:35 ` [PATCH bpf-next v4 01/15] bpf: Document XDP RX metadata Stanislav Fomichev
2022-12-13 16:37   ` David Vernet
2022-12-13 20:42     ` Stanislav Fomichev
2022-12-14 10:34       ` [xdp-hints] " 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   ` [xdp-hints] " Toke Høiland-Jørgensen
2022-12-17  4:20   ` kernel test robot
2022-12-13  2:35 ` [PATCH bpf-next v4 02/15] bpf: Rename bpf_{prog,map}_is_dev_bound to is_offloaded Stanislav Fomichev
2022-12-13  2:35 ` [PATCH bpf-next v4 03/15] bpf: Introduce device-bound XDP programs Stanislav Fomichev
2022-12-13 23:25   ` Martin KaFai Lau
2022-12-14 18:42     ` Stanislav Fomichev
2022-12-13  2:35 ` [PATCH bpf-next v4 04/15] selftests/bpf: Update expected test_offload.py messages Stanislav Fomichev
2022-12-13  2:35 ` [PATCH bpf-next v4 05/15] bpf: XDP metadata RX kfuncs Stanislav Fomichev
2022-12-13 17:00   ` 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 [this message]
2022-12-14 18:43     ` [xdp-hints] " Stanislav Fomichev
2022-12-13  2:35 ` [PATCH bpf-next v4 06/15] bpf: Support consuming XDP HW metadata from fext programs Stanislav Fomichev
2022-12-14  1:45   ` Martin KaFai Lau
2022-12-14 10:41     ` Toke Høiland-Jørgensen
2022-12-14 18:43       ` Stanislav Fomichev
2022-12-14 22:19         ` Toke Høiland-Jørgensen
2022-12-13  2:35 ` [PATCH bpf-next v4 07/15] veth: Introduce veth_xdp_buff wrapper for xdp_buff Stanislav Fomichev
2022-12-13  2:35 ` [PATCH bpf-next v4 08/15] veth: Support RX XDP metadata Stanislav Fomichev
2022-12-13 15:55   ` Jesper Dangaard Brouer
2022-12-13 20:42     ` Stanislav Fomichev
2022-12-14  9:48       ` Jesper Dangaard Brouer
2022-12-14 10:47         ` [xdp-hints] " Toke Høiland-Jørgensen
2022-12-14 18:09           ` Martin KaFai Lau
2022-12-14 18:44             ` Stanislav Fomichev
2022-12-13  2:35 ` [PATCH bpf-next v4 09/15] selftests/bpf: Verify xdp_metadata xdp->af_xdp path Stanislav Fomichev
2022-12-13  2:36 ` [PATCH bpf-next v4 10/15] net/mlx4_en: Introduce wrapper for xdp_buff Stanislav Fomichev
2022-12-13  8:56   ` Tariq Toukan
2022-12-13  2:36 ` [PATCH bpf-next v4 11/15] net/mlx4_en: Support RX XDP metadata Stanislav Fomichev
2022-12-13  8:56   ` Tariq Toukan
2022-12-13  2:36 ` [PATCH bpf-next v4 12/15] xsk: Add cb area to struct xdp_buff_xsk Stanislav Fomichev
2022-12-13  2:36 ` [PATCH bpf-next v4 13/15] net/mlx5e: Introduce wrapper for xdp_buff Stanislav Fomichev
2022-12-13  2:36 ` [PATCH bpf-next v4 14/15] net/mlx5e: Support RX XDP metadata Stanislav Fomichev
2022-12-13  2:36 ` [PATCH bpf-next v4 15/15] selftests/bpf: Simple program to dump XDP RX metadata Stanislav Fomichev

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