net: consolidate and fix ethtool_ops->get_settings calling

This patch does several things:
- introduces __ethtool_get_settings which is called from ethtool code and
  from drivers as well. Put ASSERT_RTNL there.
- dev_ethtool_get_settings() is replaced by __ethtool_get_settings()
- changes calling in drivers so rtnl locking is respected. In
  iboe_get_rate was previously ->get_settings() called unlocked. This
  fixes it. Also prb_calc_retire_blk_tmo() in af_packet.c had the same
  problem. Also fixed by calling __dev_get_by_index() instead of
  dev_get_by_index() and holding rtnl_lock for both calls.
- introduces rtnl_lock in bnx2fc_vport_create() and fcoe_vport_create()
  so bnx2fc_if_create() and fcoe_if_create() are called locked as they
  are from other places.
- use __ethtool_get_settings() in bonding code

Signed-off-by: Jiri Pirko <jpirko@redhat.com>

v2->v3:
	-removed dev_ethtool_get_settings()
	-added ASSERT_RTNL into __ethtool_get_settings()
	-prb_calc_retire_blk_tmo - use __dev_get_by_index() and lock
	 around it and __ethtool_get_settings() call
v1->v2:
        add missing export_symbol
Reviewed-by: Ben Hutchings <bhutchings@solarflare.com> [except FCoE bits]
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/ethtool.h

@@ -728,6 +728,9 @@ enum ethtool_sfeatures_retval_bits {
 /* needed by dev_disable_lro() */
 extern int __ethtool_set_flags(struct net_device *dev, u32 flags);
 
+extern int __ethtool_get_settings(struct net_device *dev,
+				  struct ethtool_cmd *cmd);
+
 /**
  * enum ethtool_phys_id_state - indicator state for physical identification
  * @ETHTOOL_ID_INACTIVE: Physical ID indicator should be deactivated

include/linux/netdevice.h

@@ -2589,9 +2589,6 @@ static inline int netif_is_bond_slave(struct net_device *dev)
 
 extern struct pernet_operations __net_initdata loopback_net_ops;
 
-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)
 {
 	if (dev->features & NETIF_F_RXCSUM)

include/rdma/ib_addr.h

@@ -218,8 +218,12 @@ static inline int iboe_get_rate(struct net_device *dev)
 {
 	struct ethtool_cmd cmd;
 	u32 speed;
+	int err;
 
-	if (dev_ethtool_get_settings(dev, &cmd))
+	rtnl_lock();
+	err = __ethtool_get_settings(dev, &cmd);
+	rtnl_unlock();
+	if (err)
 		return IB_RATE_PORT_CURRENT;
 
 	speed = ethtool_cmd_speed(&cmd);