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Tue, 08 Oct 2024 12:56:35 -0400 X-MC-Unique: UyqtCygvPGihBK7H5gw1bQ-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-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 5FCFE1956064; Tue, 8 Oct 2024 16:56:31 +0000 (UTC) Received: from [10.39.208.2] (unknown [10.39.208.2]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id D1E4F300018D; Tue, 8 Oct 2024 16:56:28 +0000 (UTC) Message-ID: <004b8cbe-7169-485a-858a-43895211b351@redhat.com> Date: Tue, 8 Oct 2024 18:56:26 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC v3 1/3] uapi: introduce kernel uAPI headers import To: David Marchand Cc: dev@dpdk.org, techboard@dpdk.org, thomas@monjalon.net, mb@smartsharesystems.com, stephen@networkplumber.org References: <20240911193224.1966122-1-maxime.coquelin@redhat.com> <20240911193224.1966122-2-maxime.coquelin@redhat.com> From: Maxime Coquelin Autocrypt: addr=maxime.coquelin@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit 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 9/17/24 13:36, David Marchand wrote: > On Wed, Sep 11, 2024 at 9:32 PM Maxime Coquelin > wrote: >> >> This patch introduces uAPI headers import 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. >> >> Guidelines are provided in the documentation, and helper >> scripts are also provided to ensure proper importation of the >> header (unmodified content from a released Kernel version): >> - import-linux-uapi.sh: used to add and update headers and >> their dependencies to linux-headers/uapi/ >> - check-linux-uapi.sh: used to check all headers are valid >> >> Signed-off-by: Maxime Coquelin > > I have been trying this script to import linux/vfio.h and cleanup its > usage in DPDK. > > There is one issue that was raised. > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/uapi/linux/vfio.h#n1573 > > struct vfio_bitmap { > __u64 pgsize; /* page size for bitmap in bytes */ > __u64 size; /* in bytes */ > __u64 __user *data; /* one bit per page */ > }; > > The __user annotation is sanitized by the headers install script in > the kernel, but the dpdk import script is missing this part. > Such sanitizations breaks the check script. > > We could invert the logic in the check script: instead of "restoring" > an imported header, the check would convert a freshly downloaded > header and compare it against the imported header in dpdk. > One thing though is that we would need a copy of the "conversion" > function in the two scripts. > > One idea.. can we have a single script? > > # Interactive mode, with questions about what to import if dependencies exist: > $ devtools/linux-uapi.sh import linux/vfio.h v6.10 > > # Non interactive mode, the script uses the version file and imported headers: > $ devtools/linux-uapi.sh check > > > Regardless of this suggestion, I have some nits about the shell scripts below: > >> --- >> devtools/check-linux-uapi.sh | 85 ++++++++++++++++++ >> devtools/import-linux-uapi.sh | 119 +++++++++++++++++++++++++ >> doc/guides/contributing/index.rst | 1 + >> doc/guides/contributing/linux_uapi.rst | 71 +++++++++++++++ >> linux-headers/uapi/.gitignore | 4 + >> linux-headers/uapi/version | 1 + >> meson.build | 8 +- >> 7 files changed, 287 insertions(+), 2 deletions(-) >> create mode 100755 devtools/check-linux-uapi.sh >> create mode 100755 devtools/import-linux-uapi.sh >> create mode 100644 doc/guides/contributing/linux_uapi.rst >> create mode 100644 linux-headers/uapi/.gitignore >> create mode 100644 linux-headers/uapi/version >> Thanks for the deep review! I think I addressed all the comments in upcoming V1 Maxime