net-timestamp: ACK timestamp for bytestreams

[cascardo/linux.git] / include / uapi / linux / errqueue.h

diff --git a/include/uapi/linux/errqueue.h b/include/uapi/linux/errqueue.h
index aacd4fb..07bdce1 100644 (file)
--- a/include/uapi/linux/errqueue.h
+++ b/include/uapi/linux/errqueue.h
@@ -22,5 +22,25 @@ struct sock_extended_err {
 
 #define SO_EE_OFFENDER(ee)     ((struct sockaddr*)((ee)+1))
 
+/**
+ *     struct scm_timestamping - timestamps exposed through cmsg
+ *
+ *     The timestamping interfaces SO_TIMESTAMPING, MSG_TSTAMP_*
+ *     communicate network timestamps by passing this struct in a cmsg with
+ *     recvmsg(). See Documentation/networking/timestamping.txt for details.
+ */
+struct scm_timestamping {
+       struct timespec ts[3];
+};
+
+/* The type of scm_timestamping, passed in sock_extended_err ee_info.
+ * This defines the type of ts[0]. For SCM_TSTAMP_SND only, if ts[0]
+ * is zero, then this is a hardware timestamp and recorded in ts[2].
+ */
+enum {
+       SCM_TSTAMP_SND,         /* driver passed skb to NIC, or HW */
+       SCM_TSTAMP_SCHED,       /* data entered the packet scheduler */
+       SCM_TSTAMP_ACK,         /* data acknowledged by peer */
+};
 
 #endif /* _UAPI_LINUX_ERRQUEUE_H */