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

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Martin KaFai Lau 2022-11-07 15:04:18 -08:00 • committed by Andrii Nakryiko

parent e4c9cf0ce8

commit 9bb053490f

3 changed files with 33 additions and 8 deletions

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1

include/uapi/linux/bpf.h

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39

net/core/filter.c

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1

tools/include/uapi/linux/bpf.h

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