netprio_cgroup: keep track of whether prio is set or not
netprio_cgroup keeps prio config per cgroup-netdev pair and doesn't
distinguish between unconfigured and explicit 0 priority. To
implement hierarchy support, it's necessary to know whether a given
pair has explicit configuration or not.
This patch adds netprio_map->aux[] which is indexed by cgroup->id and
currently only contains one bool - is_local. netprio[_set]_prio() is
updated to handle @is_local. is_local is set iff the pair has
explicit config. write_priomap() now clears is_local if a negative
value is written and sets on positive. With cgrp_css_free() also
updated to clear it, is_local is set for a cgroup-netdev pair iff the
pair is online and a positive prio has been configured via
"net_prio.ifpriomap".
is_local is visible to userland via cgroup file "net_prio.is_local".
This currently doesn't change any behavior. It will be used to
implement hierarchy support.
Signed-off-by: Tejun Heo <tj@kernel.org>
2 files changed
