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Jakub Kicinski says: ==================== This set adds support for update and delete calls from the datapath, as well as XADD instructions (32 and 64 bit) and pseudo random numbers. The XADD support depends on verifier enforcing alignment which Daniel recently added. XADD uses NFP's atomic engine which requires values to be in big endian, therefore we need to keep track of which parts of the values are used as atomics and byte swap them accordingly. Pseudo random numbers are generated using NFP's HW pseudo random number generator. Jiong tackles initial implementation of packet cache, which he describes as follows: Memory reads on NFP would first fetch data from memory to transfer-in registers, then move them from transfer-in to general registers. Given NFP is rich on transfer-in registers, they could serve as memory cache. This patch tries to identify a sequence of packet data read (BPF_LDX) that are executed sequentially, then the total access range of the sequence is calculated and attached to each read instruction, the first instruction in this sequence is marked with an cache init flag so the execution of it would bring in the whole range of packet data for the sequence. All later packet reads in this sequence would fetch data from transfer-in registers directly, no need to JIT NFP memory access. Function call, non-packet-data memory read, packet write and memcpy will invalidate the cache and start a new cache range. Cache invalidation could be improved in the future, for example packet write doesn't need to invalidate the cache if the the write destination won't be read again. ==================== Signed-off-by: Alexei Starovoitov <ast@kernel.org> |
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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.