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
