Hi all: We use flow caches based flow steering policy now. This is good for connection-oriented communication such as TCP but not for the others e.g connectionless unidirectional workload which cares only about pps. This calls the ability of supporting changing steering policies in tuntap which was done by this series.
Flow steering policy was abstracted into tun_steering_ops in the first patch. Then new ioctls to set or query current policy were introduced, and the last patch introduces a very simple policy that select txq based on processor id as an example. An example policy was implemented which allows user to load an eBPF to choose the txq. Test was done by using xdp_redirect to redirect traffic generated from MoonGen that was running on a remote machine. And I see 37% improvement for processor id policy compared to automatic flow steering policy. Changes from V1: - drop processor id example, implement an eBPF based queue selection policy instead Jason Wang (3): tun: abstract flow steering logic tun: introduce ioctls to set and get steering policies tun: add eBPF based queue selection method drivers/net/tun.c | 197 ++++++++++++++++++++++++++++++++++++++------ include/uapi/linux/if_tun.h | 9 ++ 2 files changed, 183 insertions(+), 23 deletions(-) -- 2.7.4
