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bpf: Add BPF_SOCK_OPS_TSTAMP_SND_HW_CB callback

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Support hw SCM_TSTAMP_SND case for bpf timestamping.

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

To avoid increasing the code complexity, replace SKBTX_HW_TSTAMP
with SKBTX_HW_TSTAMP_NOBPF instead of changing numerous callers
from driver side using SKBTX_HW_TSTAMP. The new definition of
SKBTX_HW_TSTAMP means the combination tests of socket timestamping
and bpf timestamping. After this patch, drivers can work under the
bpf timestamping.

Considering some drivers don't assign the skb with hardware
timestamp, this patch does the assignment and then BPF program
can acquire the hwstamp from skb directly.

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/20250220072940.99994-9-kerneljasonxing@gmail.com
This commit is contained in:
Jason Xing
2025-02-20 15:29:36 +08:00
committed by Andrii Nakryiko
parent d855493df1
commit 253b5ce758
1 changed files with 4 additions and 0 deletions
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4
include/uapi/linux/bpf.h
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@@ -7047,6 +7047,10 @@ enum {
* to the nic when SK_BPF_CB_TX_TIMESTAMPING
* feature is on.
*/
BPF_SOCK_OPS_TSTAMP_SND_HW_CB, /* Called in hardware phase 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