Hi, I am attaching an eBPF program to a TC clsacr qdisc both ingress & egress to intercept traffic. The programs are pinned to ensure that even if the associated userspace binary gets killed, eBPF programs continue to run. If the binary gets killed it is restarted and it gets the reference to the pinned programs. But there is a possibility that during the time it takes to relaunch, the qdisc these programs were attached to, goes away. Lets say due to the network interface going down and coming up. That means programs are loaded but not attached to the qdisc. Is there a way to query if a program is attached to a qdisc? There is an API bpf_tc_query() that can be used to query if any filter is attached but not to query if a specific program is attached. Thanks and regards, Dominic
