netdev - [bpf-next RFC 0/3] AF_XDP support for veth.

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Message-Id: <1545075585-27744-1-git-send-email-u9012063@gmail.com>
Date:   Mon, 17 Dec 2018 11:39:42 -0800
From:   William Tu <u9012063@...il.com>
To:     bjorn.topel@...il.com, magnus.karlsson@...il.com, ast@...nel.org,
        daniel@...earbox.net, netdev@...r.kernel.org,
        makita.toshiaki@....ntt.co.jp
Subject: [bpf-next RFC 0/3] AF_XDP support for veth. 

The patch series adds AF_XDP async xmit support for veth device.
First patch add a new API for supporting non-physical NIC device to get
packet's virtual address.  The second patch implements the async xmit,
and last patch adds example use cases.

I tested with 2 namespaces, one as sender, the other as receiver.
The packet rate is measure at the receiver side.
  ip netns add at_ns0
  ip link add p0 type veth peer name p1
  ip link set p0 netns at_ns0
  ip link set dev p1 up
  ip netns exec at_ns0 ip link set dev p0 up

  # receiver
  ip netns exec at_ns0 xdp_rxq_info --dev p0 --action XDP_DROP

  # sender with AF_XDP
  xdpsock -i p1 -t -N -z

  # or sender without AF_XDP
  xdpsock -i p1 -t -S

Without AF_XDP: 724 Kpps
RXQ stats       RXQ:CPU pps         issue-pps  
rx_queue_index    0:1   724339      0          
rx_queue_index    0:sum 724339     

With AF_XDP: 1.1 Mpps (with ksoftirqd 100% cpu)
RXQ stats       RXQ:CPU pps         issue-pps  
rx_queue_index    0:3   1188181     0          
rx_queue_index    0:sum 1188181    

William Tu (3):
  xsk: add xsk_umem_consume_tx_virtual.
  veth: support AF_XDP.
  samples: bpf: add veth AF_XDP example.

 drivers/net/veth.c             | 247 ++++++++++++++++++++++++++++++++++++++++-
 include/net/xdp_sock.h         |   7 ++
 net/xdp/xsk.c                  |  24 ++++
 samples/bpf/test_veth_afxdp.sh |  67 +++++++++++
 4 files changed, 343 insertions(+), 2 deletions(-)
 create mode 100755 samples/bpf/test_veth_afxdp.sh

-- 
2.7.4