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bpf: Add BPF_SOCK_OPS_TSTAMP_ACK_CB callback

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Support the ACK case for bpf timestamping.

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

This patch extends txstamp_ack to two bits: 1 stands for
SO_TIMESTAMPING mode, 2 bpf extension.

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/20250220072940.99994-10-kerneljasonxing@gmail.com
This commit is contained in:
Jason Xing
2025-02-20 15:29:37 +08:00
committed by Andrii Nakryiko
parent 253b5ce758
commit 79e19bb62b
1 changed files with 5 additions and 0 deletions
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5
include/uapi/linux/bpf.h
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@@ -7051,6 +7051,11 @@ enum {
* SK_BPF_CB_TX_TIMESTAMPING feature
* is on.
*/
BPF_SOCK_OPS_TSTAMP_ACK_CB, /* Called when all the skbs in the
* same sendmsg call are acked
* 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