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Richard Gobert says: ==================== net: gso: restore outer ip ids correctly GRO currently ignores outer IPv4 header IDs for encapsulated packets that have their don't-fragment flag set. GSO, however, always assumes that outer IP IDs are incrementing. This results in GSO mangling the outer IDs when they aren't incrementing. For example, GSO mangles the outer IDs of IPv6 packets that were converted to IPv4, which must have an ID of 0 according to RFC 6145, sect. 5.1. GRO+GSO is supposed to be entirely transparent by default. GSO already correctly restores inner IDs and IDs of non-encapsulated packets. The tx-tcp-mangleid-segmentation feature can be enabled to allow the mangling of such IDs so that TSO can be used. This series fixes outer ID restoration for encapsulated packets when tx-tcp-mangleid-segmentation is disabled. It also allows GRO to merge packets with fixed IDs that don't have their don't-fragment flag set. v1: https://lore.kernel.org/netdev/20250814114030.7683-1-richardbgobert@gmail.com/ v2: https://lore.kernel.org/netdev/20250819063223.5239-1-richardbgobert@gmail.com/ v3: https://lore.kernel.org/netdev/20250821073047.2091-1-richardbgobert@gmail.com/ v4: https://lore.kernel.org/netdev/20250901113826.6508-1-richardbgobert@gmail.com/ v5: https://lore.kernel.org/netdev/20250915113933.3293-1-richardbgobert@gmail.com/ v6: https://lore.kernel.org/netdev/20250916144841.4884-1-richardbgobert@gmail.com/ v7: https://lore.kernel.org/netdev/20250922084103.4764-1-richardbgobert@gmail.com/ ==================== Link: https://patch.msgid.link/20250923085908.4687-1-richardbgobert@gmail.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
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.