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Part of the emulation performed by dummy-hcd is accounting for bandwidth utilization. The total amount of data transferred in a single frame is supposed to be no larger than an actual USB connection could accommodate. Currently the driver performs bandwidth limiting only for bulk transfers; control and periodic transfers are effectively unlimited. (Presumably drivers were not expected to request extremely large control or interrupt transfers.) This patch improves the situation somewhat by restricting them as well. The emulation still isn't perfect. On a real system, even 0-length transfers use some bandwidth because of transaction overhead (IN, OUT, ACK, NACK packets) and packet overhead (SYNC, PID, bit stuffing, CRC, EOP). Adding in those factors is left as an exercise for a later patch. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.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.