Re: [net-next,v4] openvswitch: Add packet len info to upcall.
From: David Miller <davem@davemloft.net>
Date: 2016-06-22 20:35:21
From: William Tu <redacted> Date: Mon, 20 Jun 2016 07:26:17 -0700
The commit f2a4d086ed4c ("openvswitch: Add packet truncation support.")
introduces packet truncation before sending to userspace upcall receiver.
This patch passes up the skb->len before truncation so that the upcall
receiver knows the original packet size. Potentially this will be used
by sFlow, where OVS translates sFlow config header=N to a sample action,
truncating packet to N byte in kernel datapath. Thus, only N bytes instead
of full-packet size is copied from kernel to userspace, saving the
kernel-to-userspace bandwidth.
Signed-off-by: William Tu <redacted>Applied.