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Some multifunction PCI devices with more than 8 functions use "alternative routing-ID interpretation" (ARI), which means the 8-bit device/function number field will be interpreted as 8 bits specifying the function number (the device number is 0 implicitly), rather than the upper 5 bits specifying the device number and the lower 3 bits specifying the function number. The kernel can enable and use this. Expose in a sysfs attribute whether the kernel has enabled ARI, so that a program in userspace won't have to parse PCI devices and PCI configuration space to figure out if it is enabled. This will allow better predictable network naming using PCI function numbers without using PCI bus or device numbers, which is desirable because bus and device numbers can change with system configuration but function numbers will not. Signed-off-by: Stuart Hayes <stuart.w.hayes@gmail.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.