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authorRichard Cochran <richardcochran@gmail.com>2012-04-03 22:59:17 +0000
committerDavid S. Miller <davem@davemloft.net>2012-04-04 05:28:45 -0400
commitc8f3a8c31069137fe0100e6920558f1a7487ef3c (patch)
tree891303875fcca8c8110c949955b87e1447dbcdfc /net/core/ethtool.c
parent995a9090b2b7dc734351f3ac0ba8d913ffb87001 (diff)
downloadlinux-c8f3a8c31069137fe0100e6920558f1a7487ef3c.tar.bz2
ethtool: Introduce a method for getting time stamping capabilities.
This commit adds a new ethtool ioctl that exposes the SO_TIMESTAMPING capabilities of a network interface. In addition, user space programs can use this ioctl to discover the PTP Hardware Clock (PHC) device associated with the interface. Since software receive time stamps are handled by the stack, the generic ethtool code can answer the query correctly in case the MAC or PHY drivers lack special time stamping features. Signed-off-by: Richard Cochran <richardcochran@gmail.com> Reviewed-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/ethtool.c')
-rw-r--r--net/core/ethtool.c48
1 files changed, 45 insertions, 3 deletions
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 6d6d7d25caaa..a723b1321691 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -17,6 +17,8 @@
#include <linux/errno.h>
#include <linux/ethtool.h>
#include <linux/netdevice.h>
+#include <linux/net_tstamp.h>
+#include <linux/phy.h>
#include <linux/bitops.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
@@ -1278,6 +1280,40 @@ out:
return ret;
}
+static int ethtool_get_ts_info(struct net_device *dev, void __user *useraddr)
+{
+ int err = 0;
+ struct ethtool_ts_info info;
+ const struct ethtool_ops *ops = dev->ethtool_ops;
+ struct phy_device *phydev = dev->phydev;
+
+ memset(&info, 0, sizeof(info));
+ info.cmd = ETHTOOL_GET_TS_INFO;
+
+ if (phydev && phydev->drv && phydev->drv->ts_info) {
+
+ err = phydev->drv->ts_info(phydev, &info);
+
+ } else if (dev->ethtool_ops && dev->ethtool_ops->get_ts_info) {
+
+ err = ops->get_ts_info(dev, &info);
+
+ } else {
+ info.so_timestamping =
+ SOF_TIMESTAMPING_RX_SOFTWARE |
+ SOF_TIMESTAMPING_SOFTWARE;
+ info.phc_index = -1;
+ }
+
+ if (err)
+ return err;
+
+ if (copy_to_user(useraddr, &info, sizeof(info)))
+ err = -EFAULT;
+
+ return err;
+}
+
/* The main entry point in this file. Called from net/core/dev.c */
int dev_ethtool(struct net *net, struct ifreq *ifr)
@@ -1295,11 +1331,13 @@ int dev_ethtool(struct net *net, struct ifreq *ifr)
return -EFAULT;
if (!dev->ethtool_ops) {
- /* ETHTOOL_GDRVINFO does not require any driver support.
- * It is also unprivileged and does not change anything,
- * so we can take a shortcut to it. */
+ /* A few commands do not require any driver support,
+ * are unprivileged, and do not change anything, so we
+ * can take a shortcut to them. */
if (ethcmd == ETHTOOL_GDRVINFO)
return ethtool_get_drvinfo(dev, useraddr);
+ else if (ethcmd == ETHTOOL_GET_TS_INFO)
+ return ethtool_get_ts_info(dev, useraddr);
else
return -EOPNOTSUPP;
}
@@ -1330,6 +1368,7 @@ int dev_ethtool(struct net *net, struct ifreq *ifr)
case ETHTOOL_GRXCLSRULE:
case ETHTOOL_GRXCLSRLALL:
case ETHTOOL_GFEATURES:
+ case ETHTOOL_GET_TS_INFO:
break;
default:
if (!capable(CAP_NET_ADMIN))
@@ -1496,6 +1535,9 @@ int dev_ethtool(struct net *net, struct ifreq *ifr)
case ETHTOOL_GET_DUMP_DATA:
rc = ethtool_get_dump_data(dev, useraddr);
break;
+ case ETHTOOL_GET_TS_INFO:
+ rc = ethtool_get_ts_info(dev, useraddr);
+ break;
default:
rc = -EOPNOTSUPP;
}