[ovs-dev] [PATCH] datapath:backport: openvswitch: Add packet len info to upcall.
pravin shelar
pshelar at ovn.org
Fri Jun 24 23:15:39 UTC 2016
On Fri, Jun 24, 2016 at 3:50 PM, William Tu <u9012063 at gmail.com> wrote:
> Upstream commit:
> commit b95e5928fcc76d156352570858abdea7b2628efd
> Author: William Tu <u9012063 at gmail.com>
> Date: Mon Jun 20 07:26:17 2016 -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 <u9012063 at gmail.com>
> Cc: Pravin Shelar <pshelar at nicira.com>
> Acked-by: Pravin B Shelar <pshelar at ovn.org>
> Signed-off-by: David S. Miller <davem at davemloft.net>
>
> Tested-at: https://travis-ci.org/williamtu/ovs-travis/builds/140135299
> Signed-off-by: William Tu <u9012063 at gmail.com>
> ---
looks good to me. Applied to master.
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