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Björn Töpel says: ==================== This patch set introduces zero-copy AF_XDP support for Intel's i40e driver. In the first preparatory patch we also add support for XDP_REDIRECT for zero-copy allocated frames so that XDP programs can redirect them. This was a ToDo from the first AF_XDP zero-copy patch set from early June. Special thanks to Alex Duyck and Jesper Dangaard Brouer for reviewing earlier versions of this patch set. The i40e zero-copy code is located in its own file i40e_xsk.[ch]. Note that in the interest of time, to get an AF_XDP zero-copy implementation out there for people to try, some code paths have been copied from the XDP path to the zero-copy path. It is out goal to merge the two paths in later patch sets. In contrast to the implementation from beginning of June, this patch set does not require any extra HW queues for AF_XDP zero-copy TX. Instead, the XDP TX HW queue is used for both XDP_REDIRECT and AF_XDP zero-copy TX. Jeff, given that most of changes are in i40e, it is up to you how you would like to route these patches. The set is tagged bpf-next, but if taking it via the Intel driver tree is easier, let us know. We have run some benchmarks on a dual socket system with two Broadwell E5 2660 @ 2.0 GHz with hyperthreading turned off. Each socket has 14 cores which gives a total of 28, but only two cores are used in these experiments. One for TR/RX and one for the user space application. The memory is DDR4 @ 2133 MT/s (1067 MHz) and the size of each DIMM is 8192MB and with 8 of those DIMMs in the system we have 64 GB of total memory. The compiler used is gcc (Ubuntu 7.3.0-16ubuntu3) 7.3.0. The NIC is Intel I40E 40Gbit/s using the i40e driver. Below are the results in Mpps of the I40E NIC benchmark runs for 64 and 1500 byte packets, generated by a commercial packet generator HW outputing packets at full 40 Gbit/s line rate. The results are with retpoline and all other spectre and meltdown fixes, so these results are not comparable to the ones from the zero-copy patch set in June. AF_XDP performance 64 byte packets. Benchmark XDP_SKB XDP_DRV XDP_DRV with zerocopy rxdrop 2.6 8.2 15.0 txpush 2.2 - 21.9 l2fwd 1.7 2.3 11.3 AF_XDP performance 1500 byte packets: Benchmark XDP_SKB XDP_DRV XDP_DRV with zerocopy rxdrop 2.0 3.3 3.3 l2fwd 1.3 1.7 3.1 XDP performance on our system as a base line: 64 byte packets: XDP stats CPU pps issue-pps XDP-RX CPU 16 18.4M 0 1500 byte packets: XDP stats CPU pps issue-pps XDP-RX CPU 16 3.3M 0 The structure of the patch set is as follows: Patch 1: Add support for XDP_REDIRECT of zero-copy allocated frames Patches 2-4: Preparatory patches to common xsk and net code Patches 5-7: Preparatory patches to i40e driver code for RX Patch 8: i40e zero-copy support for RX Patch 9: Preparatory patch to i40e driver code for TX Patch 10: i40e zero-copy support for TX Patch 11: Add flags to sample application to force zero-copy/copy mode ==================== Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Alexei Starovoitov <ast@kernel.org> |
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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.
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.