From: Ivan Vecera <ivec...@redhat.com>
Date: Thu, 8 Feb 2018 16:10:39 +0100
> The following sequence is currently broken:
>
> # tc qdisc add dev foo ingress
> # tc filter replace dev foo protocol all ingress \
> u32 match u8 0 0 action mirred egress mirror dev bar1
> # tc filter replace dev foo protocol all ingress \
> handle 800::800 pref 49152 \
> u32 match u8 0 0 action mirred egress mirror dev bar2
> Error: cls_u32: Key node flags do not match passed flags.
> We have an error talking to the kernel, -1
>
> The error comes from u32_change() when comparing new and
> existing flags. The existing ones always contains one of
> TCA_CLS_FLAGS_{,NOT}_IN_HW flag depending on offloading state.
> These flags cannot be passed from userspace so the condition
> (n->flags != flags) in u32_change() always fails.
>
> Fix the condition so the flags TCA_CLS_FLAGS_NOT_IN_HW and
> TCA_CLS_FLAGS_IN_HW are not taken into account.
>
> Fixes: 24d3dc6d27ea ("net/sched: cls_u32: Reflect HW offload status")
> Signed-off-by: Ivan Vecera <ivec...@redhat.com>
Ugh, private kernel flags are always troublesome for this reason.
Applied and queued up for -stable.
