ethtool: cosmetic: Use ethtool ethtool_cmd_speed API

This updates the network drivers so that they don't access the
ethtool_cmd::speed field directly, but use ethtool_cmd_speed()
instead.

For most of the drivers, these changes are purely cosmetic and don't
fix any problem, such as for those 1GbE/10GbE drivers that indirectly
call their own ethtool get_settings()/mii_ethtool_gset(). The changes
are meant to enforce code consistency and provide robustness with
future larger throughputs, at the expense of a few CPU cycles for each
ethtool operation.

All drivers compiled with make allyesconfig ion x86_64 have been
updated.

Tested: make allyesconfig on x86_64 + e1000e/bnx2x work
Signed-off-by: David Decotigny <decot@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 004f266..7c7c9a8 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -10025,10 +10025,10 @@
 
 	cmd->advertising = tp->link_config.advertising;
 	if (netif_running(dev)) {
-		cmd->speed = tp->link_config.active_speed;
+		ethtool_cmd_speed_set(cmd, tp->link_config.active_speed);
 		cmd->duplex = tp->link_config.active_duplex;
 	} else {
-		cmd->speed = SPEED_INVALID;
+		ethtool_cmd_speed_set(cmd, SPEED_INVALID);
 		cmd->duplex = DUPLEX_INVALID;
 	}
 	cmd->phy_address = tp->phy_addr;