From 6b98ec7e882af1c3088a88757e2226d06c8514f9 Mon Sep 17 00:00:00 2001 From: Jason Xing Date: Thu, 20 Feb 2025 15:29:34 +0800 Subject: bpf: Add BPF_SOCK_OPS_TSTAMP_SCHED_CB callback 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 Signed-off-by: Martin KaFai Lau Reviewed-by: Willem de Bruijn Link: https://patch.msgid.link/20250220072940.99994-7-kerneljasonxing@gmail.com --- include/linux/skbuff.h | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'include/linux') diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index bb2b751d274a..52f6e033e704 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -489,10 +489,14 @@ enum { /* generate software time stamp when entering packet scheduling */ SKBTX_SCHED_TSTAMP = 1 << 6, + + /* used for bpf extension when a bpf program is loaded */ + SKBTX_BPF = 1 << 7, }; #define SKBTX_ANY_SW_TSTAMP (SKBTX_SW_TSTAMP | \ - SKBTX_SCHED_TSTAMP) + SKBTX_SCHED_TSTAMP | \ + SKBTX_BPF) #define SKBTX_ANY_TSTAMP (SKBTX_HW_TSTAMP | \ SKBTX_HW_TSTAMP_USE_CYCLES | \ SKBTX_ANY_SW_TSTAMP) -- cgit v1.2.3