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bpf: Add BPF_SOCK_OPS_TSTAMP_SND_SW_CB callback

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Support sw SCM_TSTAMP_SND case for bpf timestamping.

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

Based on this patch, BPF program will get the software
timestamp when the driver is ready to send the skb. In the
sebsequent patch, the hardware timestamp will be supported.

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/20250220072940.99994-8-kerneljasonxing@gmail.com
This commit is contained in:
Jason Xing
2025-02-20 15:29:35 +08:00
committed by Martin KaFai Lau
parent 6b98ec7e88
commit ecebb17ad8
4 changed files with 17 additions and 2 deletions
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4
include/uapi/linux/bpf.h
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@@ -7036,6 +7036,10 @@ enum {
* SK_BPF_CB_TX_TIMESTAMPING
* feature is on.
*/
BPF_SOCK_OPS_TSTAMP_SND_SW_CB, /* Called when skb is about to send
* to the nic 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