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TCP checksums on received packets may be set to NULL by the sender if CSO is enabled. The hypervisor flags these packets as check-sum-ok and the skb is then flagged CHECKSUM_UNNECESSARY. If these packets are then forwarded the sender will not request CSO due to the CHECKSUM_UNNECESSARY flag. The result is a TCP packet sent with a bad checksum. This change sets up CHECKSUM_PARTIAL on these packets causing the sender to correctly request CSUM offload. Signed-off-by: David Wilder <dwilder@us.ibm.com> Reviewed-by: Pradeep Satyanarayana <pradeeps@linux.vnet.ibm.com> Tested-by: Cristobal Forno <cforno12@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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 Restructured Text 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.