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bpf: Add hwtstamp field for the sockops prog

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The bpf-tc prog has already been able to access the
skb_hwtstamps(skb)->hwtstamp.  This patch extends the same hwtstamp
access to the sockops prog.

In sockops, the skb is also available to the bpf prog during
the BPF_SOCK_OPS_PARSE_HDR_OPT_CB event.  There is a use case
that the hwtstamp will be useful to the sockops prog to better
measure the one-way-delay when the sender has put the tx
timestamp in the tcp header option.

Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20221107230420.4192307-2-martin.lau@linux.dev
This commit is contained in:
Martin KaFai Lau
2022-11-07 15:04:18 -08:00
committed by Andrii Nakryiko
parent e1b34c589d
commit 00fc9f407c
1 changed files with 1 additions and 0 deletions
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include/uapi/linux/bpf.h
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@@ -6445,6 +6445,7 @@ struct bpf_sock_ops {
* the outgoing header has not * the outgoing header has not
* been written yet. * been written yet.
*/ */
__u64 skb_hwtstamp;
}; };
/* Definitions for bpf_sock_ops_cb_flags */ /* Definitions for bpf_sock_ops_cb_flags */