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-rw-r--r--Documentation/networking/timestamping.txt12
1 files changed, 11 insertions, 1 deletions
diff --git a/Documentation/networking/timestamping.txt b/Documentation/networking/timestamping.txt
index 1d6d02d6ba52..b08e27261ff9 100644
--- a/Documentation/networking/timestamping.txt
+++ b/Documentation/networking/timestamping.txt
@@ -122,7 +122,7 @@ SOF_TIMESTAMPING_RAW_HARDWARE:
1.3.3 Timestamp Options
-The interface supports one option
+The interface supports the options
SOF_TIMESTAMPING_OPT_ID:
@@ -145,6 +145,16 @@ SOF_TIMESTAMPING_OPT_ID:
stream sockets, it increments with every byte.
+SOF_TIMESTAMPING_OPT_CMSG:
+
+ Support recv() cmsg for all timestamped packets. Control messages
+ are already supported unconditionally on all packets with receive
+ timestamps and on IPv6 packets with transmit timestamp. This option
+ extends them to IPv4 packets with transmit timestamp. One use case
+ is to correlate packets with their egress device, by enabling socket
+ option IP_PKTINFO simultaneously.
+
+
1.4 Bytestream Timestamps
The SO_TIMESTAMPING interface supports timestamping of bytes in a