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authorBen Hutchings <bhutchings@solarflare.com>2010-12-09 12:08:35 +0000
committerWilly Tarreau <w@1wt.eu>2014-06-19 00:25:56 +0200
commitd100b2748ac930237a97646ae9a4721a7f62acc1 (patch)
tree5fcee71d7e62fbbc17c01227e5cabbbd9d2cd46d
parent7f62be2f53a2353a7e5c124075ec22a4344e8d57 (diff)
downloadlinux-linaro-stable-d100b2748ac930237a97646ae9a4721a7f62acc1.tar.gz
ethtool: Report link-down while interface is down
While an interface is down, many implementations of ethtool_ops::get_link, including the default, ethtool_op_get_link(), will report the last link state seen while the interface was up. In general the current physical link state is not available if the interface is down. Define ETHTOOL_GLINK to reflect whether the interface *and* any physical port have a working link, and consistently return 0 when the interface is down. Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net> (cherry picked from commit e596e6e4d578f2639416e620d367a3af34814a40) Cc: Wang Weidong <wangweidong1@huawei.com> Signed-off-by: Willy Tarreau <w@1wt.eu>
-rw-r--r--include/linux/ethtool.h4
-rw-r--r--net/core/ethtool.c17
2 files changed, 18 insertions, 3 deletions
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 7ffab7cb..3a0fae6 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -517,7 +517,9 @@ struct ethtool_ops {
#define ETHTOOL_GMSGLVL 0x00000007 /* Get driver message level */
#define ETHTOOL_SMSGLVL 0x00000008 /* Set driver msg level. */
#define ETHTOOL_NWAY_RST 0x00000009 /* Restart autonegotiation. */
-#define ETHTOOL_GLINK 0x0000000a /* Get link status (ethtool_value) */
+/* Get link status for host, i.e. whether the interface *and* the
+ * physical port (if there is one) are up (ethtool_value). */
+#define ETHTOOL_GLINK 0x0000000a
#define ETHTOOL_GEEPROM 0x0000000b /* Get EEPROM data */
#define ETHTOOL_SEEPROM 0x0000000c /* Set EEPROM data. */
#define ETHTOOL_GCOALESCE 0x0000000e /* Get coalesce config */
diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index abbe8fa..f9e7179 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -365,6 +365,20 @@ static int ethtool_nway_reset(struct net_device *dev)
return dev->ethtool_ops->nway_reset(dev);
}
+static int ethtool_get_link(struct net_device *dev, char __user *useraddr)
+{
+ struct ethtool_value edata = { .cmd = ETHTOOL_GLINK };
+
+ if (!dev->ethtool_ops->get_link)
+ return -EOPNOTSUPP;
+
+ edata.data = netif_running(dev) && dev->ethtool_ops->get_link(dev);
+
+ if (copy_to_user(useraddr, &edata, sizeof(edata)))
+ return -EFAULT;
+ return 0;
+}
+
static int ethtool_get_eeprom(struct net_device *dev, void __user *useraddr)
{
struct ethtool_eeprom eeprom;
@@ -1016,8 +1030,7 @@ int dev_ethtool(struct net *net, struct ifreq *ifr)
rc = ethtool_nway_reset(dev);
break;
case ETHTOOL_GLINK:
- rc = ethtool_get_value(dev, useraddr, ethcmd,
- dev->ethtool_ops->get_link);
+ rc = ethtool_get_link(dev, useraddr);
break;
case ETHTOOL_GEEPROM:
rc = ethtool_get_eeprom(dev, useraddr);