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In Table 8-16 of the "Intel® Ethernet Controller XL710 Datasheet" it is stated that when the whole packet is written to a single buffer, the header length field in the descriptor will be 0. This means that when extracting the packet/data_len field from the descriptor in the driver we do not need to mask out the extra header-length bits. Inside the vector driver, this reduces the need to pull all four pktlen fields into a single register to work on. Instead of a shift and mask, we now need to only do a shift. Therefore, we can work on each descriptor independently, processing each using one shift intrinsic and a blend. This change makes the code shorter and easier to read, so we can pull it into the main descriptor processing loop instead of needing its own function. This in turn makes the descriptor processing in the loop as a whole slightly easier to read as it's more linear. In terms of performance, in testing this change shows little effect, with single-core perf tests showing a very slight improvement. Signed-off-by: Bruce Richardson <bruce.richardson@intel.com> Acked-by: Zhe Tao <zhe.tao@intel.com> |
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| README | ||
DPDK is a set of libraries and drivers for fast packet processing. It supports many processor architectures and both FreeBSD and Linux. The DPDK uses the Open Source BSD license for the core libraries and drivers. The kernel components are GPLv2 licensed. Please check the doc directory for release notes, API documentation, and sample application information. For questions and usage discussions, subscribe to: users@dpdk.org Report bugs and issues to the development mailing list: dev@dpdk.org