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    Subject[RFC PATCH net-next 00/12] XDP batching for TUN/vhost_net
    Date
    Hi all:

    We do not support XDP batching for TUN since it can only receive one
    packet a time from vhost_net. This series tries to remove this
    limitation by:

    - introduce a TUN specific msg_control that can hold a pointer to an
    array of XDP buffs
    - try copy and build XDP buff in vhost_net
    - store XDP buffs in an array and submit them once for every N packets
    from vhost_net
    - since TUN can only do native XDP for datacopy packet, to simplify
    the logic, split datacopy out logic and only do batching for
    datacopy.

    With this series, TX PPS can improve about 34% from 2.9Mpps to
    3.9Mpps when doing xdp_redirect_map between TAP and ixgbe.

    Thanks

    Jason Wang (12):
    vhost_net: introduce helper to initialize tx iov iter
    vhost_net: introduce vhost_exceeds_weight()
    vhost_net: introduce vhost_has_more_pkts()
    vhost_net: split out datacopy logic
    vhost_net: batch update used ring for datacopy TX
    tuntap: enable premmption early
    tuntap: simplify error handling in tun_build_skb()
    tuntap: tweak on the path of non-xdp case in tun_build_skb()
    tuntap: split out XDP logic
    vhost_net: build xdp buff
    vhost_net: passing raw xdp buff to tun
    vhost_net: batch submitting XDP buffers to underlayer sockets

    drivers/net/tun.c | 226 +++++++++++++++++++++++++++----------
    drivers/vhost/net.c | 297 ++++++++++++++++++++++++++++++++++++++++++++-----
    include/linux/if_tun.h | 7 ++
    3 files changed, 444 insertions(+), 86 deletions(-)

    --
    2.7.4

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