ethtool: Call ethtool's get/set_settings callbacks with cleaned data

This makes sure that when a driver calls the ethtool's
get/set_settings() callback of another driver, the data passed to it
is clean. This guarantees that speed_hi will be zeroed correctly if
the called callback doesn't explicitely set it: we are sure we don't
get a corrupted speed from the underlying driver. We also take care of
setting the cmd field appropriately (ETHTOOL_GSET/SSET).

This applies to dev_ethtool_get_settings(), which now makes sure it
sets up that ethtool command parameter correctly before passing it to
drivers. This also means that whoever calls dev_ethtool_get_settings()
does not have to clean the ethtool command parameter. This function
also becomes an exported symbol instead of an inline.

All drivers visible to make allyesconfig under x86_64 have been
updated.

Signed-off-by: David Decotigny <decot@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 12 insertions, 14 deletions

diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index 7e6e0a8..4194a20 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -744,7 +744,9 @@ bool ethtool_invalid_flags(struct net_device *dev, u32 data, u32 supported);
 /**
  * struct ethtool_ops - optional netdev operations
  * @get_settings: Get various device settings including Ethernet link
- *	settings.  Returns a negative error code or zero.
+ *	settings. The @cmd parameter is expected to have been cleared
+ *	before get_settings is called. Returns a negative error code or
+ *	zero.
  * @set_settings: Set various device settings including Ethernet link
  *	settings.  Returns a negative error code or zero.
  * @get_drvinfo: Report driver/device information.  Should only set the
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index e03af35..d5de66a 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2597,13 +2597,8 @@ static inline int netif_is_bond_slave(struct net_device *dev)
 
 extern struct pernet_operations __net_initdata loopback_net_ops;
 
-static inline int dev_ethtool_get_settings(struct net_device *dev,
-					   struct ethtool_cmd *cmd)
-{
-	if (!dev->ethtool_ops || !dev->ethtool_ops->get_settings)
-		return -EOPNOTSUPP;
-	return dev->ethtool_ops->get_settings(dev, cmd);
-}
+int dev_ethtool_get_settings(struct net_device *dev,
+			     struct ethtool_cmd *cmd);
 
 static inline u32 dev_ethtool_get_rx_csum(struct net_device *dev)
 {
diff --git a/include/rdma/ib_addr.h b/include/rdma/ib_addr.h
index b5fc9f3..ae8c68f 100644
--- a/include/rdma/ib_addr.h
+++ b/include/rdma/ib_addr.h
@@ -217,18 +217,19 @@ static inline enum ib_mtu iboe_get_mtu(int mtu)
 static inline int iboe_get_rate(struct net_device *dev)
 {
 	struct ethtool_cmd cmd;
+	u32 speed;
 
-	if (!dev->ethtool_ops || !dev->ethtool_ops->get_settings ||
-	    dev->ethtool_ops->get_settings(dev, &cmd))
+	if (dev_ethtool_get_settings(dev, &cmd))
 		return IB_RATE_PORT_CURRENT;
 
-	if (cmd.speed >= 40000)
+	speed = ethtool_cmd_speed(&cmd);
+	if (speed >= 40000)
 		return IB_RATE_40_GBPS;
-	else if (cmd.speed >= 30000)
+	else if (speed >= 30000)
 		return IB_RATE_30_GBPS;
-	else if (cmd.speed >= 20000)
+	else if (speed >= 20000)
 		return IB_RATE_20_GBPS;
-	else if (cmd.speed >= 10000)
+	else if (speed >= 10000)
 		return IB_RATE_10_GBPS;
 	else
 		return IB_RATE_PORT_CURRENT;