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Jakub Kicinski says: ==================== nfp: XDP adjust head support This series adds support for XDP adjust head. Bulk of the code is actually just paying technical debt. On reconfiguration request nfp was allocating new resources separately leaving device running with the existing set of rings. We used to manage the new resources in special ring set structures. This set is simply separating the datapath part of the device structure from the control information allowing the new datapath structure to be allocated with all new memory and rings. The swap operation is now greatly simplified. We also save a lot of parameter passing this way. Hopefully the churn is worth the negative diffstat. Support for XDP adjust head is done in a pretty standard way. NFP is a bit special because it prepends metadata before packet data so we have to do a bit of memcpying in case XDP will run. We also luck out a little bit because the fact that we already have prepend space allocated means that one byte is enough to store the extra XDP space (256 of standard prepend space is a bit inconvenient since it would normally require 16bits or boolean with additional shifts). ==================== 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.