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bpf: Add BPF_SOCK_OPS_TSTAMP_SCHED_CB callback

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Support SCM_TSTAMP_SCHED case for bpf timestamping.

Add a new sock_ops callback, BPF_SOCK_OPS_TSTAMP_SCHED_CB. This
callback will occur at the same timestamping point as the user
space's SCM_TSTAMP_SCHED. The BPF program can use it to get the
same SCM_TSTAMP_SCHED timestamp without modifying the user-space
application.

A new SKBTX_BPF flag is added to mark skb_shinfo(skb)->tx_flags,
ensuring that the new BPF timestamping and the current user
space's SO_TIMESTAMPING do not interfere with each other.

Signed-off-by: Jason Xing <kerneljasonxing@gmail.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20250220072940.99994-7-kerneljasonxing@gmail.com
This commit is contained in:
Jason Xing
2025-02-20 15:29:34 +08:00
committed by Andrii Nakryiko
parent 43b6c2cd70
commit 7ea10cfba8
1 changed files with 5 additions and 0 deletions
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5
include/uapi/linux/bpf.h
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@@ -7038,6 +7038,11 @@ enum {
* by the kernel or the
* earlier bpf-progs.
*/
BPF_SOCK_OPS_TSTAMP_SCHED_CB, /* Called when skb is passing
* through dev layer when
* SK_BPF_CB_TX_TIMESTAMPING
* feature is on.
*/
};
/* List of TCP states. There is a build check in net/ipv4/tcp.c to detect