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/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
index 57c2ac0..a5d9b1c 100644
--- a/drivers/net/mv643xx_eth.c
+++ b/drivers/net/mv643xx_eth.c
@@ -1444,13 +1444,13 @@
 	cmd->advertising = ADVERTISED_MII;
 	switch (port_status & PORT_SPEED_MASK) {
 	case PORT_SPEED_10:
-		cmd->speed = SPEED_10;
+		ethtool_cmd_speed_set(cmd, SPEED_10);
 		break;
 	case PORT_SPEED_100:
-		cmd->speed = SPEED_100;
+		ethtool_cmd_speed_set(cmd, SPEED_100);
 		break;
 	case PORT_SPEED_1000:
-		cmd->speed = SPEED_1000;
+		ethtool_cmd_speed_set(cmd, SPEED_1000);
 		break;
 	default:
 		cmd->speed = -1;