1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (C) 2022 Linutronix GmbH */ 3 4 #include <linux/bpf.h> 5 #include <bpf/bpf_helpers.h> 6 7 char _license[] SEC("license") = "GPL"; 8 9 SEC("tc") 10 int time_tai(struct __sk_buff *skb) 11 { 12 __u64 ts1, ts2; 13 14 /* Get TAI timestamps */ 15 ts1 = bpf_ktime_get_tai_ns(); 16 ts2 = bpf_ktime_get_tai_ns(); 17 18 /* Save TAI timestamps (Note: skb->hwtstamp is read-only) */ 19 skb->tstamp = ts1; 20 skb->cb[0] = ts2 & 0xffffffff; 21 skb->cb[1] = ts2 >> 32; 22 23 return 0; 24 } 25