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Mon, 09 Sep 2024 03:43:24 -0400 X-MC-Unique: CGTM0YkWODO6jfGfKspJvA-1 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id DBB421955F2C; Mon, 9 Sep 2024 07:43:22 +0000 (UTC) Received: from [10.39.208.34] (unknown [10.39.208.34]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 7623A30001A1; Mon, 9 Sep 2024 07:43:20 +0000 (UTC) Message-ID: Date: Mon, 9 Sep 2024 09:43:17 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC 1/3] uapi: introduce kernel uAPI headers importation To: Stephen Hemminger Cc: dev@dpdk.org, techboard@dpdk.org, david.marchand@redhat.com, thomas@monjalon.net References: <20240905221528.1861323-1-maxime.coquelin@redhat.com> <20240905221528.1861323-2-maxime.coquelin@redhat.com> <20240908170246.7606c092@hermes.local> From: Maxime Coquelin Autocrypt: addr=maxime.coquelin@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org On 9/9/24 02:02, Stephen Hemminger wrote: > On Fri, 6 Sep 2024 00:15:26 +0200 > Maxime Coquelin wrote: > >> This patch introduces uAPI headers importation into the >> DPDK repository. This import is possible thanks to Linux >> Kernel licence exception for syscalls: >> >> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/LICENSES/exceptions/Linux-syscall-note >> >> Header files are have to be explicitly imported, and >> libraries and drivers have to explicitly enable their >> inclusion. >> >> Guidelines are provided in the documentation, and a helper >> script is also provided to ensure proper importation of the >> header (unmodified content from a released Kernel version). >> >> Next version will introduce a script to check headers are >> valids. >> >> Signed-off-by: Maxime Coquelin >> --- >> devtools/import-linux-uapi.sh | 48 ++++++++++++++++++++ >> doc/guides/contributing/index.rst | 1 + >> doc/guides/contributing/linux_uapi.rst | 63 ++++++++++++++++++++++++++ >> meson.build | 4 ++ >> 4 files changed, 116 insertions(+) >> create mode 100755 devtools/import-linux-uapi.sh >> create mode 100644 doc/guides/contributing/linux_uapi.rst >> >> diff --git a/devtools/import-linux-uapi.sh b/devtools/import-linux-uapi.sh >> new file mode 100755 >> index 0000000000..efeffdd332 >> --- /dev/null >> +++ b/devtools/import-linux-uapi.sh >> @@ -0,0 +1,48 @@ >> +#!/bin/sh -e >> +# SPDX-License-Identifier: BSD-3-Clause >> +# Copyright (c) 2024 Red Hat, Inc. >> + >> +# >> +# Import Linux Kernel uAPI header file >> +# >> + >> +base_url="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/plain/include/uapi/" >> +base_path="linux-headers/uapi/" > > Sorry, not a fan of this. > > This must be optional. Most other projects don't do this and it risks > incompatibilities with the C library. QEMU, libgpio at least do this. Supporting new features is quite a mess in lib Vhost currently, because we cannot know what is and what is not defined in the build OS headers. For example: https://github.com/DPDK/dpdk/blob/main/lib/vhost/vhost.h#L369 > > > Did you make sure the headers are exactly the same as the distro uses (for the same kernel version). > Worried that this is not the exact same process that "make headers_install" might use. We could have them picked from make headers_install. It would be heavier to do, but could be done if you see any difference. > > Also, ideally the tool would be selective. > Selective about what? Note that this current RFC is too simplistic, it misses nested headers import. Will try to cover this in nect revision. Thanks, Maxime