net: sched: cls_api: handle generic cls errors
This patch adds extack support for generic cls handling. The extack will be set deeper to each called function which is not part of netdev core api. Cc: David Ahern <dsahern@gmail.com> Signed-off-by: NAlexander Aring <aring@mojatatu.com> Acked-by: NJiri Pirko <jiri@mellanox.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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