.. index:: pair: group; Check sending and receiving with AF_XDP sockets
.. _doxid-group__rss-af__xdp:

Check sending and receiving with AF_XDP sockets
===============================================

.. toctree::
	:hidden:

Check that AF_XDP sockets can receive and send packets.

#. Create UDP socket on Tester, bind it to **tst_addr**.

#. Make sure that RSS indirection table mentions all the available Rx queues on IUT.

#. From IUT TA pin XSK BPF map of **rxq_stats** XDP program to a file. From IUT RPC server open that file to obtain file descriptor of the map.

#. Create AF_XDP sockets on IUT, one per each Rx queue. Set XDP copy mode according to **copy_mode** when binding the sockets. Set corresponding entries of the XSK map to file desciptors of the created sockets.

#. Configure **rxq_stats** program on IUT to process only packets going from **tst_addr** to **iut_addr** (accepting any destination port).

#. For every Rx queue on IUT:
   
   * Find the destination IUT port such that with that port packets sent from **tst_addr** will be directed to the tested Rx queue.
   
   * Send a packet from the Tester socket. Check that the AF_XDP socket assigned to the tested Rx queue gets that packet. Construct a reply by inverting addresses and ports of the received packet. Send it back to Tester over the same AF_XDP socket. Check that the Tester socket gets it and its payload is the same as in the previously sent packet.



.. rubric:: Parameters:

.. list-table::
	:widths: 20 80

	*
		- env

		- 
		  Testing environment:
		  
		  * :ref:`env.peer2peer <doxid-group__env-peer2peer>`
		  
		  * :ref:`env.peer2peer_ipv6 <doxid-group__env-peer2peer__ipv6>`

	*
		- copy_mode

		- 
		  XDP copy mode:
		  
		  * ``none`` (kernel tries zero-copy, falls back to copy mode if it fails)
		  
		  * ``copy``
		  
		  * ``zerocopy``