netdev - Re: [PATCH bpf-next v2 0/8] Add a test for SHARED

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Date: Wed, 27 Sep 2023 10:14:14 +0200
From: Magnus Karlsson <magnus.karlsson@...il.com>
To: Tushar Vyavahare <tushar.vyavahare@...el.com>
Cc: bpf@...r.kernel.org, netdev@...r.kernel.org, bjorn@...nel.org, 
	magnus.karlsson@...el.com, maciej.fijalkowski@...el.com, 
	jonathan.lemon@...il.com, davem@...emloft.net, kuba@...nel.org, 
	pabeni@...hat.com, ast@...nel.org, daniel@...earbox.net, 
	tirthendu.sarkar@...el.com
Subject: Re: [PATCH bpf-next v2 0/8] Add a test for SHARED_UMEM feature

On Mon, 25 Sept 2023 at 12:01, Tushar Vyavahare
<tushar.vyavahare@...el.com> wrote:
>
> Implement a test for the SHARED_UMEM feature in this patch set and make
> necessary changes/improvements. Ensure that the framework now supports
> different streams for different sockets.
>
> v1->v2
>         - Remove generate_mac_addresses() and generate mac addresses based on
>           the number of sockets in __test_spec_init() function. [Magnus]
>         - Update Makefile to include find_bit.c for compiling xskxceiver.
>         - Add bitmap_full() function to verify all bits are set to break the while loop
>           in the receive_pkts() and send_pkts() functions.
>         - Replace __test_and_set_bit() function with __set_bit() function.
>         - Add single return check for wait_for_tx_completion() function call.

Just two things to fix in patch #4. Please send a v3 and then you have
my ack for the set. Thank you!

> Patch series summary:
>
> 1: Move the packet stream from the ifobject struct to the xsk_socket_info
>    struct to enable the use of different streams for different sockets
>    This will facilitate the sending and receiving of data from multiple
>    sockets simultaneously using the SHARED_XDP_UMEM feature.
>
>    It gives flexibility of send/recive individual traffic on particular
>    socket.
>
> 2: Rename the header file to a generic name so that it can be used by all
>    future XDP programs.
>
> 3: Move the src_mac and dst_mac fields from the ifobject structure to the
>    xsk_socket_info structure to achieve per-socket MAC address assignment.
>    Require this in order to steer traffic to various sockets in subsequent
>    patches.
>
> 4: Improve the receive_pkt() function to enable it to receive packets from
>    multiple sockets. Define a sock_num variable to iterate through all the
>    sockets in the Rx path. Add nb_valid_entries to check that all the
>    expected number of packets are received.
>
> 5: The pkt_set() function no longer needs the umem parameter. This commit
>    removes the umem parameter from the pkt_set() function.
>
> 6: Iterate over all the sockets in the send pkts function. Update
>    send_pkts() to handle multiple sockets for sending packets.
>    Multiple TX sockets are utilized alternately based on the batch size
>    for improve packet transmission.
>
> 7: Modify xsk_update_xskmap() to accept the index as an argument, enabling
>    the addition of multiple sockets to xskmap.
>
> 8: Add a new test for testing shared umem feature. This is accomplished by
>    adding a new XDP program and using the multiple sockets. The new  XDP
>    program redirects the packets based on the destination MAC address.
>
> Tushar Vyavahare (8):
>   selftests/xsk: move pkt_stream to the xsk_socket_info
>   selftests/xsk: rename xsk_xdp_metadata.h to xsk_xdp_common.h
>   selftests/xsk: move src_mac and dst_mac to the xsk_socket_info
>   selftests/xsk: iterate over all the sockets in the receive pkts
>     function
>   selftests/xsk: remove unnecessary parameter from pkt_set() function
>     call
>   selftests/xsk: iterate over all the sockets in the send pkts function
>   selftests/xsk: modify xsk_update_xskmap() to accept the index as an
>     argument
>   selftests/xsk: add a test for shared umem feature
>
>  tools/testing/selftests/bpf/Makefile          |   4 +-
>  .../selftests/bpf/progs/xsk_xdp_progs.c       |  22 +-
>  tools/testing/selftests/bpf/xsk.c             |   3 +-
>  tools/testing/selftests/bpf/xsk.h             |   2 +-
>  tools/testing/selftests/bpf/xsk_xdp_common.h  |  12 +
>  .../testing/selftests/bpf/xsk_xdp_metadata.h  |   5 -
>  tools/testing/selftests/bpf/xskxceiver.c      | 513 +++++++++++-------
>  tools/testing/selftests/bpf/xskxceiver.h      |  13 +-
>  8 files changed, 363 insertions(+), 211 deletions(-)
>  create mode 100644 tools/testing/selftests/bpf/xsk_xdp_common.h
>  delete mode 100644 tools/testing/selftests/bpf/xsk_xdp_metadata.h
>
> --
> 2.34.1
>
>