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R. Parameswaran says: ==================== L2TP:Adjust intf MTU, add underlay L3, L2 hdrs. Existing L2TP kernel code does not derive the optimal MTU for Ethernet pseudowires and instead leaves this to a userspace L2TP daemon or operator. If an MTU is not specified, the existing kernel code chooses an MTU that does not take account of all tunnel header overheads, which can lead to unwanted IP fragmentation. When L2TP is used without a control plane (userspace daemon), we would prefer that the kernel does a better job of choosing a default pseudowire MTU, taking account of all tunnel header overheads, including IP header options, if any. This patch addresses this. Change-set is organized as a two part patch series, with one patch introducing a new kernel function to compute the IP overhead on a socket, and the other patch using this new kernel function to compute the default L2TP MTU for an Ethernet pseudowire. Existing code also seems to assume an Ethernet (non-jumbo) underlay. The change proposed here uses the PMTU mechanism and the dst entry in the L2TP tunnel socket to directly pull up the underlay MTU (as the baseline number on top of which the encapsulation headers are factored in). An default MTU value of 1500 bytes is assumed as a fallback only if this fails. Fixed the kbuild test robot error in the previous posting. ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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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.