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dbf4feb043
Move the xsk_fwd example application from the Linux repo to bpf-examples. This sample demonstrates the ability to share a umem between multiple sockets by implementing a simple packet forwarding application. It also has a buffer pool manager for allocating and freeing packet buffers. Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
29 lines
1.2 KiB
Org Mode
29 lines
1.2 KiB
Org Mode
#+Title: AF_XDP socket multi-threaded forwarding sample application
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This sample code could originally be found in the Linux source code
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tree under samples/bpf. It illustrates the packet forwarding between
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multiple AF_XDP sockets in multi-threading environment. All the
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threads and sockets are sharing a common buffer pool, with each socket
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having its own private buffer cache. The sockets are created with the
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xsk_socket__create_shared() function, which allows multiple AF_XDP
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sockets to share the same UMEM object.
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Example 1: Single thread handling two sockets. Packets received from
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socket A (on top of interface IFA, queue QA) are forwarded to socket B
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(on top of interface IFB, queue QB) and vice-versa. The thread is
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affinitized to CPU core C:
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#+BEGIN_SRC sh
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./xsk_fwd -i IFA -q QA -i IFB -q QB -c C
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#+END_SRC
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Example 2: Two threads, each handling two sockets. Packets from socket
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A are sent to socket B (by thread X), packets from socket B are sent
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to socket A (by thread X); packets from socket C are sent to socket D
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(by thread Y), packets from socket D are sent to socket C (by thread
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Y). The two threads are bound to CPU cores CX and CY:
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#+BEGIN_SRC sh
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./xdp_fwd -i IFA -q QA -i IFB -q QB -i IFC -q QC -i IFD -q QD -c CX -c CY
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#+END_SRC
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