// SPDX-License-Identifier: GPL-2.0 /* Copyright (C) 2022 Linutronix GmbH */ #include <linux/bpf.h> #include <bpf/bpf_helpers.h> char _license[] SEC("license") = "GPL"; SEC("tc") int time_tai(struct __sk_buff *skb) { __u64 ts1, ts2; /* Get TAI timestamps */ ts1 = bpf_ktime_get_tai_ns(); ts2 = bpf_ktime_get_tai_ns(); /* Save TAI timestamps (Note: skb->hwtstamp is read-only) */ skb->tstamp = ts1; skb->cb[0] = ts2 & 0xffffffff; skb->cb[1] = ts2 >> 32; return 0; }