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If HW is RSC capable, it cannot add dummy bytes at the start of IP packets. Alignment (ie number of dummy bytes) is configured using the RBOF field inside the NCFGR register. On the software side, the skb_reserve(skb, NET_IP_ALIGN) call must only be done if those dummy bytes are added by the hardware; notice the skb_reserve() is done AFTER writing the address to the device. We cannot do the skb_reserve() call BEFORE writing the address because the address field ignores the low 2/3 bits. Conclusion: in some cases, we risk not being able to respect the NET_IP_ALIGN value (which is picked based on unaligned CPU access performance). Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Link: https://patch.msgid.link/20251023-macb-eyeq5-v3-2-af509422c204@bootlin.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.