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Turning on receive and/or transmit checksum offload support on the OSA card requires 2 commands: 1. start command which replies with available features 2. enable command to turn on selected features. The current version does not check the reply of the start command and simply uses the returned value to enable offload features. When the start command returns zero, this leads to a situation where no checksum offload is turned on by the hardware. Even worse no error indication is returned. The Linux kernel assumes the OSA card performs RX/TX checksum offload, but the hardware does not perform any checksum verification at all. This patch checks the return of the start and enable command responses from the hardware and turns off checksum offloading if the commands fails or does not respond with the correct bit setting. Signed-off-by: Thomas Richter <tmricht@linux.vnet.ibm.com> Reviewed-by: Julian Wiedmann <jwi@linux.vnet.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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.