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Yuval Mintz says: ==================== qed: Status block changes The device maintains a CAM mapping of the internal status blocks and the various PF/VF MSI-x vector mappings. During initialization, the driver reads the HW memory and constructs a shadow SW implementation which it would later use for manipulation of interrupts. E.g., when enabling VFs and setting their MSI-x tables. The driver currently has some very strict assumptions on the order the entries are placed in the CAM. Specifically, it assumes that all entries belonging to a PF would be consecutive and in-order in the CAM, and that the VF entries would then follow. But there's no actual HW constraint enforcing this assumption [although management firmware does set it accordingly to same assumption initially]. Since the CAM is re-configurable, there are now SW flows employeed by other OSes that might cause the assumption to be invalid. Such flows allow the PF to forfeit some of it's available interrupts in favor of its VFs or vice versa. While those are not employeed today by qed, we want to relax the assumptions as much as we can - both to allow functionality after PDA as well as allowing future compatibility where the driver would be loaded after a newer one has 'dirtied' the CAM configuration. In addition to patches meant for the above relaxation, the series also contains various cleanups & refactoring for interrupt logic [most of which is !semantic]. ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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| README | ||
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.