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Tell the MAC not to discard frames that fail TCP/IP checksum validation. By default, when the hardware checksum engine (CoE) is enabled, dwmac4 silently drops any packet where the offload engine detects a checksum error. These frames are not reported to the driver and are not counted in any statistics as dropped packets. Set the MTL_OP_MODE_DIS_TCP_EF bit when initializing the Rx channel so that all packets are delivered, even if they failed hardware checksum validation. CoE remains enabled, but instead of dropping such frames, the driver propagates the error status and marks the skb with CHECKSUM_NONE. This allows the stack to verify and drop the packet while updating statistics. This change follows the decision made in the discussion: Link: https://lore.kernel.org/all/20250625132117.1b3264e8@kernel.org/ It depends on the previous patches that added proper error propagation in the Rx path. Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Link: https://patch.msgid.link/20250818090217.2789521-4-o.rempel@pengutronix.de Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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.