netdev - [PATCH V3 net-next 08/28] ethtool: Add a common function for drivers with transmit time stamping.

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Message-Id: <a7ec1893167462243c5657d7ad9a8ef4b20d5e97.1333474523.git.richardcochran@gmail.com>
Date:	Tue,  3 Apr 2012 19:47:32 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	<netdev@...r.kernel.org>
Cc:	David Miller <davem@...emloft.net>,
	Ben Hutchings <bhutchings@...arflare.com>,
	Martin Porter <mporter@...arflare.com>,
	Jacob Keller <jacob.e.keller@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	e1000-devel@...ts.sourceforge.net
Subject: [PATCH V3 net-next 08/28] ethtool: Add a common function for drivers with transmit time stamping.

Currently, most drivers do not support transmit SO_TIMESTAMPING. For those
that do support it, there is one appropriate response to the get_ts_info
query. This patch adds a common function providing this response.

Signed-off-by: Richard Cochran <richardcochran@...il.com>
---
 include/linux/ethtool.h |    1 +
 net/core/ethtool.c      |   11 +++++++++++
 2 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 1769714..560a247 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -811,6 +811,7 @@ struct net_device;
 
 /* Some generic methods drivers may use in their ethtool_ops */
 u32 ethtool_op_get_link(struct net_device *dev);
+int ethtool_op_get_ts_info(struct net_device *dev, struct ethtool_ts_info *eti);
 
 /**
  * ethtool_rxfh_indir_default - get default value for RX flow hash indirection
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index a723b13..beacdd9 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -38,6 +38,17 @@ u32 ethtool_op_get_link(struct net_device *dev)
 }
 EXPORT_SYMBOL(ethtool_op_get_link);
 
+int ethtool_op_get_ts_info(struct net_device *dev, struct ethtool_ts_info *info)
+{
+	info->so_timestamping =
+		SOF_TIMESTAMPING_TX_SOFTWARE |
+		SOF_TIMESTAMPING_RX_SOFTWARE |
+		SOF_TIMESTAMPING_SOFTWARE;
+	info->phc_index = -1;
+	return 0;
+}
+EXPORT_SYMBOL(ethtool_op_get_ts_info);
+
 /* Handlers for each ethtool command */
 
 #define ETHTOOL_DEV_FEATURE_WORDS	((NETDEV_FEATURE_COUNT + 31) / 32)
-- 
1.7.2.5

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