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This patch adds tracepoints to the i40e and i40evf drivers to which BPF programs can be attached for feature testing and verification. It's expected that an attached BPF program will identify and count or log some interesting subset of traffic. The bcc-tools package is helpful there for containing all the BPF arcana in a handy Python wrapper. Though you can make these tracepoints log trace messages, the messages themselves probably won't be very useful (other to verify the tracepoint is being called while you're debugging your BPF program). The idea here is that tracepoints have such low performance cost when disabled that we can leave these in the upstream drivers. This may eventually enable the instrumentation of unmodified customer systems should the need arise to verify a NIC feature is working as expected. In general this enables one set of feature verification tools to be used on these drivers whether they're built with the kernel or separately. Users are advised against using these tracepoints for anything other than a diagnostic tool. They have a performance impact when enabled, and their exact placement and form may change as we see how well they work in practice for the purposes above. Change-ID: Id6014a7322c0e6d08068114dd20bd156f2f6435e Signed-off-by: Scott Peterson <scott.d.peterson@intel.com> Tested-by: Andrew Bowers <andrewx.bowers@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> |
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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.