[bpf-next,v5,00/12] bpf: Support dumping kfunc prototypes from BTF

Message ID	cover.1718207789.git.dxu@dxuuu.xyz
Headers	show Received: from wfout6-smtp.messagingengine.com (wfout6-smtp.messagingengine.com [64.147.123.149]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5B807181CE2; Wed, 12 Jun 2024 15:58:53 +0000 (UTC) Feedback-ID: i6a694271:Fastmail From: Daniel Xu <dxu@dxuuu.xyz> To: bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, fsverity@lists.linux.dev, andrii@kernel.org, jolsa@kernel.org, linux-kbuild@vger.kernel.org, linux-trace-kernel@vger.kernel.org, netdev@vger.kernel.org, olsajiri@gmail.com, quentin@isovalent.com, alan.maguire@oracle.com, acme@kernel.org, eddyz87@gmail.com Cc: kernel-team@meta.com Subject: [PATCH bpf-next v5 00/12] bpf: Support dumping kfunc prototypes from BTF Date: Wed, 12 Jun 2024 09:58:24 -0600 Message-ID: <cover.1718207789.git.dxu@dxuuu.xyz> Precedence: bulk MIME-Version: 1.0 Content-Transfer-Encoding: 8bit
Series	bpf: Support dumping kfunc prototypes from BTF \| expand [bpf-next,v5,00/12] bpf: Support dumping kfunc prototypes from BTF [bpf-next,v5,02/12] bpf: selftests: Fix bpf_iter_task_vma_new() prototype [bpf-next,v5,03/12] bpf: selftests: Fix fentry test kfunc prototypes [bpf-next,v5,04/12] bpf: selftests: Fix bpf_cpumask_first_zero() kfunc prototype [bpf-next,v5,05/12] bpf: selftests: Fix bpf_map_sum_elem_count() kfunc prototype [bpf-next,v5,07/12] bpf: selftests: Namespace struct_opt callbacks in bpf_dctcp [bpf-next,v5,09/12] bpf: treewide: Align kfunc signatures to prog point-of-view [bpf-next,v5,10/12] bpf: selftests: nf: Opt out of using generated kfunc prototypes [bpf-next,v5,11/12] bpf: selftests: xfrm: Opt out of using generated kfunc prototypes

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cover.1718207789.git.dxu@dxuuu.xyz

Headers

Feedback-ID: i6a694271:Fastmail
From: Daniel Xu <dxu@dxuuu.xyz>
To: bpf@vger.kernel.org,
	linux-kselftest@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	fsverity@lists.linux.dev,
	andrii@kernel.org,
	jolsa@kernel.org,
	linux-kbuild@vger.kernel.org,
	linux-trace-kernel@vger.kernel.org,
	netdev@vger.kernel.org,
	olsajiri@gmail.com,
	quentin@isovalent.com,
	alan.maguire@oracle.com,
	acme@kernel.org,
	eddyz87@gmail.com
Cc: kernel-team@meta.com
Subject: [PATCH bpf-next v5 00/12] bpf: Support dumping kfunc prototypes from
 BTF
Date: Wed, 12 Jun 2024 09:58:24 -0600
Message-ID: <cover.1718207789.git.dxu@dxuuu.xyz>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

Series

bpf: Support dumping kfunc prototypes from BTF | expand

Message

Daniel Xu June 12, 2024, 3:58 p.m. UTC

This patchset enables both detecting as well as dumping compilable
prototypes for kfuncs.

The first commit instructs pahole to DECL_TAG kfuncs when available.
This requires v1.27 which was released on 6/11/24. With it, users will
be able to look at BTF inside vmlinux (or modules) and check if the
kfunc they want is available.

The final commit teaches bpftool how to dump kfunc prototypes. This
is done for developer convenience.

The rest of the commits are fixups to enable selftests to use the
newly dumped kfunc prototypes. With these, selftests will regularly
exercise the newly added codepaths.

Tested with and without the required pahole changes:

  * https://github.com/kernel-patches/bpf/pull/7186
  * https://github.com/kernel-patches/bpf/pull/7187

=== Changelog ===