35149b2c04
This sample code illustrates the packet forwarding between multiple AF_XDP sockets in multi-threading environment. All the threads and sockets are sharing a common buffer pool, with each socket having its own private buffer cache. The sockets are created with the xsk_socket__create_shared() function, which allows multiple AF_XDP sockets to share the same UMEM object. Example 1: Single thread handling two sockets. Packets received from socket A (on top of interface IFA, queue QA) are forwarded to socket B (on top of interface IFB, queue QB) and vice-versa. The thread is affinitized to CPU core C: ./xsk_fwd -i IFA -q QA -i IFB -q QB -c C Example 2: Two threads, each handling two sockets. Packets from socket A are sent to socket B (by thread X), packets from socket B are sent to socket A (by thread X); packets from socket C are sent to socket D (by thread Y), packets from socket D are sent to socket C (by thread Y). The two threads are bound to CPU cores CX and CY: ./xdp_fwd -i IFA -q QA -i IFB -q QB -i IFC -q QC -i IFD -q QD -c CX -c CY Signed-off-by: Cristian Dumitrescu <cristian.dumitrescu@intel.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Björn Töpel <bjorn.topel@intel.com> Link: https://lore.kernel.org/bpf/1598603189-32145-15-git-send-email-magnus.karlsson@intel.com
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.
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.