net-timestamp: extend SCM_TIMESTAMPING ancillary data struct
Applications that request kernel tx timestamps with SO_TIMESTAMPING
read timestamps as recvmsg() ancillary data. The response is defined
implicitly as timespec[3].
1) define struct scm_timestamping explicitly and
2) add support for new tstamp types. On tx, scm_timestamping always
accompanies a sock_extended_err. Define previously unused field
ee_info to signal the type of ts[0]. Introduce SCM_TSTAMP_SND to
define the existing behavior.
The reception path is not modified. On rx, no struct similar to
sock_extended_err is passed along with SCM_TIMESTAMPING.
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 281dece..477f0f6 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -249,6 +249,9 @@
SKBTX_SHARED_FRAG = 1 << 5,
};
+#define SKBTX_ANY_SW_TSTAMP SKBTX_SW_TSTAMP
+#define SKBTX_ANY_TSTAMP (SKBTX_HW_TSTAMP | SKBTX_ANY_SW_TSTAMP)
+
/*
* The callback notifies userspace to release buffers when skb DMA is done in
* lower device, the skb last reference should be 0 when calling this.
diff --git a/include/net/sock.h b/include/net/sock.h
index b91c886..02f5b35 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -2169,7 +2169,9 @@
*/
if (sock_flag(sk, SOCK_RCVTSTAMP) ||
sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE) ||
- (kt.tv64 && sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) ||
+ (kt.tv64 &&
+ (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE) ||
+ skb_shinfo(skb)->tx_flags & SKBTX_ANY_SW_TSTAMP)) ||
(hwtstamps->hwtstamp.tv64 &&
sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)))
__sock_recv_timestamp(msg, sk, skb);
diff --git a/include/uapi/linux/errqueue.h b/include/uapi/linux/errqueue.h
index aacd4fb..accee72 100644
--- a/include/uapi/linux/errqueue.h
+++ b/include/uapi/linux/errqueue.h
@@ -22,5 +22,23 @@
#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 */
+};
#endif /* _UAPI_LINUX_ERRQUEUE_H */