Support SCM_TSTAMP_COMPLETION case for bpf timestamping.
Add a new sock_ops callback, BPF_SOCK_OPS_TSTAMP_SND_SW_CB. This
callback shall occur at the same timestamping point as the user
space's software SCM_TSTAMP_COMPLETION. The BPF program can use it to
get the same SCM_TSTAMP_COMPLETION timestamp without modifying the
user-space application.
Emitting BPF completion timestamps is enabled in separate patches.
Signed-off-by: Pauli Virtanen <pav@xxxxxx>
---
include/uapi/linux/bpf.h | 5 +++++
net/core/skbuff.c | 3 +++
2 files changed, 8 insertions(+)
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index defa5bb881f4..6cd918febcb3 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -7054,6 +7054,11 @@ enum {
* sendmsg timestamp with corresponding
* tskey.
*/
+ BPF_SOCK_OPS_TSTAMP_COMPLETION_CB, /* Called on skb completion
+ * report from hardware 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
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 6cbf77bc61fc..9b2ff115eaf5 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -5552,6 +5552,9 @@ static void skb_tstamp_tx_report_bpf_timestamping(struct sk_buff *skb,
case SCM_TSTAMP_ACK:
op = BPF_SOCK_OPS_TSTAMP_ACK_CB;
break;
+ case SCM_TSTAMP_COMPLETION:
+ op = BPF_SOCK_OPS_TSTAMP_COMPLETION_CB;
+ break;
default:
return;
}
--
2.49.0
