[PATCH net-next 0/2] xsk: improvement performance in copy mode

[Jason Xing <kerneljasonxing@gmail.com>]

From: Jason Xing <kernelxing@tencent.com>

Like in VM using virtio_net, there are not that many machines supporting
advanced function like multi-buffer and zerocopy. Using xsk copy mode
becomes a default choice to support bypass kernel feature instead of
resorting to DPDK.

Prior to this series, zerocopy mode has a better performance than copy
mode. But now, the copy mode outperforms zc mode by 12.9%, which was
tested on ixgbe driver by means of xdpsock.

The thought behind this series is to aggregate packets in a certain
small group like GSO/GRO and then send them at one time by only grabbing
the tx queue and disable bh once.

Jason Xing (2):
  xsk: introduce XDP_GENERIC_XMIT_BATCH setsockopt
  xsk: support generic batch xmit in copy mode

 Documentation/networking/af_xdp.rst |   9 ++
 include/linux/netdevice.h           |   2 +
 include/net/xdp_sock.h              |   2 +
 include/uapi/linux/if_xdp.h         |   1 +
 net/core/dev.c                      |  18 ++++
 net/xdp/xsk.c                       | 135 +++++++++++++++++++++++++++-
 tools/include/uapi/linux/if_xdp.h   |   1 +
 7 files changed, 165 insertions(+), 3 deletions(-)

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2.41.3