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The needed headroom that we ask the stack to reserve for us in TX skbs is larger than the headroom available in RX frames, which leads to skb reallocations in forwarding scenarios involving two DPNI interfaces. Configure the hardware to reserve some extra space in the RX frame headroom to avoid this situation. The value is chosen based on the Tx frame data offset, the Rx buffer alignment value and the netdevice required headroom. The network stack will take care to reserve space for HH_DATA_MOD when building the skb, so there's no need to account for it in the netdevice needed headroom. Signed-off-by: Bogdan Purcareata <bogdan.purcareata@nxp.com> Signed-off-by: Ioana Radulescu <ruxandra.radulescu@nxp.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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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.