linux-kernel - [PATCH v2 8/8] socket: Update timestamping Documentation

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Message-Id: <20181211202520.16799-9-deepa.kernel@gmail.com>
Date:   Tue, 11 Dec 2018 12:25:20 -0800
From:   Deepa Dinamani <deepa.kernel@...il.com>
To:     davem@...emloft.net, linux-kernel@...r.kernel.org
Cc:     netdev@...r.kernel.org, arnd@...db.de, y2038@...ts.linaro.org
Subject: [PATCH v2 8/8] socket: Update timestamping Documentation

With the new y2038 safe timestamping options added, update the
documentation to reflect the changes.

Signed-off-by: Deepa Dinamani <deepa.kernel@...il.com>
---
 Documentation/networking/timestamping.txt | 43 ++++++++++++++++++++---
 1 file changed, 38 insertions(+), 5 deletions(-)

diff --git a/Documentation/networking/timestamping.txt b/Documentation/networking/timestamping.txt
index 1be0b6f9e0cb..67e4ab3cdb86 100644
--- a/Documentation/networking/timestamping.txt
+++ b/Documentation/networking/timestamping.txt
@@ -6,11 +6,21 @@ The interfaces for receiving network packages timestamps are:
 * SO_TIMESTAMP
   Generates a timestamp for each incoming packet in (not necessarily
   monotonic) system time. Reports the timestamp via recvmsg() in a
-  control message as struct timeval (usec resolution).
+  control message in usec resolution.
+  SO_TIMESTAMP is defined as SO_TIMESTAMP_NEW or SO_TIMESTAMP_OLD
+  based on the architecture type and time_t representation of libc.
+  Control message format is in struct __kernel_old_timeval for
+  SO_TIMESTAMP_OLD and in struct __kernel_sock_timeval for
+  SO_TIMESTAMP_NEW options respectively.
 
 * SO_TIMESTAMPNS
   Same timestamping mechanism as SO_TIMESTAMP, but reports the
-  timestamp as struct timespec (nsec resolution).
+  timestamp as struct timespec in nsec resolution.
+  SO_TIMESTAMPNS is defined as SO_TIMESTAMPNS_NEW or SO_TIMESTAMPNS_OLD
+  based on the architecture type and time_t representation of libc.
+  Control message format is in struct timespec for SO_TIMESTAMPNS_OLD
+  and in struct __kernel_timespec for SO_TIMESTAMPNS_NEW options
+  respectively.
 
 * IP_MULTICAST_LOOP + SO_TIMESTAMP[NS]
   Only for multicast:approximate transmit timestamp obtained by
@@ -22,7 +32,7 @@ The interfaces for receiving network packages timestamps are:
   timestamps for stream sockets.
 
 
-1.1 SO_TIMESTAMP:
+1.1 SO_TIMESTAMP (also SO_TIMESTAMP_OLD and SO_TIMESTAMP_NEW):
 
 This socket option enables timestamping of datagrams on the reception
 path. Because the destination socket, if any, is not known early in
@@ -31,15 +41,25 @@ same is true for all early receive timestamp options.
 
 For interface details, see `man 7 socket`.
 
+Always use SO_TIMESTAMP_NEW timestamp to always get timestamp in
+struct __kernel_sock_timeval format.
 
-1.2 SO_TIMESTAMPNS:
+SO_TIMESTAMP_OLD returns incorrect timestamps after the year 2038
+on 32 bit machines.
+
+1.2 SO_TIMESTAMPNS (also SO_TIMESTAMPNS_OLD and SO_TIMESTAMPNS_NEW):
 
 This option is identical to SO_TIMESTAMP except for the returned data type.
 Its struct timespec allows for higher resolution (ns) timestamps than the
 timeval of SO_TIMESTAMP (ms).
 
+Always use SO_TIMESTAMPNS_NEW timestamp to always get timestamp in
+struct __kernel_timespec format.
+
+SO_TIMESTAMPNS_OLD returns incorrect timestamps after the year 2038
+on 32 bit machines.
 
-1.3 SO_TIMESTAMPING:
+1.3 SO_TIMESTAMPING (also SO_TIMESTAMPING_OLD and SO_TIMESTAMPING_NEW):
 
 Supports multiple types of timestamp requests. As a result, this
 socket option takes a bitmap of flags, not a boolean. In
@@ -323,10 +343,23 @@ SO_TIMESTAMP and SO_TIMESTAMPNS records can be retrieved.
 These timestamps are returned in a control message with cmsg_level
 SOL_SOCKET, cmsg_type SCM_TIMESTAMPING, and payload of type
 
+For SO_TIMESTAMPING_OLD:
+
 struct scm_timestamping {
 	struct timespec ts[3];
 };
 
+For SO_TIMESTAMPING_NEW:
+
+struct scm_timestamping64 {
+	struct __kernel_timespec ts[3];
+
+Always use SO_TIMESTAMPING_NEW timestamp to always get timestamp in
+struct scm_timestamping64 format.
+
+SO_TIMESTAMPING_OLD returns incorrect timestamps after the year 2038
+on 32 bit machines.
+
 The structure can return up to three timestamps. This is a legacy
 feature. At least one field is non-zero at any time. Most timestamps
 are passed in ts[0]. Hardware timestamps are passed in ts[2].
-- 
2.17.1