diff options
| author | Jason Xing <kerneljasonxing@gmail.com> | 2025-02-20 15:29:37 +0800 |
|---|---|---|
| committer | Martin KaFai Lau <martin.lau@kernel.org> | 2025-02-20 14:29:43 -0800 |
| commit | b3b81e6b009dd8f85cd3b9c65eb492249c2649a8 (patch) | |
| tree | ab5f6727c4276805bf7dc4b773c2b2636a4e66d0 /include | |
| parent | 2deaf7f42b8c551e84da20483ca2d4a65c3623b3 (diff) | |
bpf: Add BPF_SOCK_OPS_TSTAMP_ACK_CB callback
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
Diffstat (limited to 'include')
| -rw-r--r-- | include/net/tcp.h | 6 | ||||
| -rw-r--r-- | include/uapi/linux/bpf.h | 5 |
2 files changed, 9 insertions, 2 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index 94ea09faedf4..ae6c95b01012 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -964,10 +964,12 @@ struct tcp_skb_cb { __u8 sacked; /* State flags for SACK. */ __u8 ip_dsfield; /* IPv4 tos or IPv6 dsfield */ - __u8 txstamp_ack:1, /* Record TX timestamp for ack? */ +#define TSTAMP_ACK_SK 0x1 +#define TSTAMP_ACK_BPF 0x2 + __u8 txstamp_ack:2, /* Record TX timestamp for ack? */ eor:1, /* Is skb MSG_EOR marked? */ has_rxtstamp:1, /* SKB has a RX timestamp */ - unused:5; + unused:4; __u32 ack_seq; /* Sequence number ACK'd */ union { struct { diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 72045c242396..cc10104f34a0 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -7044,6 +7044,11 @@ 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 |