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In VFs, there is a known issue which can cause writebacks to not occur when interrupts are disabled and there are less than 4 descriptors resulting in TX timeout. Timeout can also occur due to lost interrupt. The current implementation for detecting and recovering from hung queues in the PF is problematic because it actually actively encourages lost interrupts. By triggering a SW interrupt, interrupts are forced on. If we are already in napi_poll and an interrupt fires, napi_poll will not be rescheduled and the interrupt is effectively lost; thereby potentially *causing* hung queues. This patch checks whether packets are being processed between every watchdog cycle and determine potential hung queue and fires triggers SW interrupt only for that particular queue. Signed-off-by: Sudheer Mogilappagari <sudheer.mogilappagari@intel.com> Tested-by: Andrew Bowers <andrewx.bowers@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> |
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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.