On Wed, Jun 15, 2016 at 7:28 PM, William Tu <u9012...@gmail.com> wrote:
> The commit f2a4d086ed4c ("openvswitch: Add packet truncation support.")
> introduces packet truncation before sending to userspace upcall receiver.
> This patch passes the number of bytes truncated in kernel to 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 to trunc(N) in kernel datapath. Thus, only N bytes instead of
> full-packet size will be copied from kernel to userspace, saving the
> kernel-to-userspace bandwidth.
>
> Signed-off-by: William Tu <u9012...@gmail.com>
> Cc: Pravin Shelar <pshe...@nicira.com>This is passing unnecessary kernel implementation details to userspace, can we just pass skb-len to userspace?
