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Parse/translate a set of TC pedit actions to be formed in the HW API format. User-space provides set of keys where each one of them is made of: command (add or set), header-type, byte offset within that header along with a 32 bit mask and value. The mask dictates what bits in the 32 bit word that starts on the offset we should be dealing with, but under negative polarity (unset bits are to be modified). We do a 1st pass over the set of keys while using the header-type and offset to fill the masks and the values into a data-structure containting all the supported network headers. We then do a 2nd pass over the set of fields to re-write supported by the HW, where for each such candidate field, we use the masks filled on the 1st pass to realize if we should offloading re-write it. In case offloading is required, we fill a HW descriptor with the following: (1) the header field to modify (2) the bit offset within the field from where to modify (set command only) (3) the value to set/add (4) the length in bits 1...32 to modify (set command only) Note that it's possible for a given pedit mask to dictate modifying the same header field multiple times or to modify multiple header fields. Currently such combinations are not supported for offloading, hence, for set commands, the offset within the field is always zero, and the length to modify is the field size. Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com> Reviewed-by: Amir Vadai <amir@vadai.me> Signed-off-by: Saeed Mahameed <saeedm@mellanox.com> |
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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.