IPoIB: Remove TX moderation settings from ethtool support

As of commit f56bcd8 ("IPoIB: Use separate CQ for UD send
completions"), there are no TX interrupts.  Change the ethtool code
not to report TX moderation settings, so users will not be misled to
think they can control TX interrupt moderation.  Pointed out by Alex
Vainman <alexv@voltaire.com>

Signed-off-by: Or Gerlitz <ogerlitz@voltaire.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/ulp/ipoib/ipoib_ethtool.c

@@ -55,9 +55,7 @@ static int ipoib_get_coalesce(struct net_device *dev,
 	struct ipoib_dev_priv *priv = netdev_priv(dev);
 
 	coal->rx_coalesce_usecs = priv->ethtool.coalesce_usecs;
-	coal->tx_coalesce_usecs = priv->ethtool.coalesce_usecs;
 	coal->rx_max_coalesced_frames = priv->ethtool.max_coalesced_frames;
-	coal->tx_max_coalesced_frames = priv->ethtool.max_coalesced_frames;
 
 	return 0;
 }
@@ -69,10 +67,8 @@ static int ipoib_set_coalesce(struct net_device *dev,
 	int ret;
 
 	/*
-	 * Since IPoIB uses a single CQ for both rx and tx, we assume
-	 * that rx params dictate the configuration.  These values are
-	 * saved in the private data and returned when ipoib_get_coalesce()
-	 * is called.
+	 * These values are saved in the private data and returned
+	 * when ipoib_get_coalesce() is called
 	 */
 	if (coal->rx_coalesce_usecs       > 0xffff ||
 	    coal->rx_max_coalesced_frames > 0xffff)
@@ -85,8 +81,6 @@ static int ipoib_set_coalesce(struct net_device *dev,
 		return ret;
 	}
 
-	coal->tx_coalesce_usecs       = coal->rx_coalesce_usecs;
-	coal->tx_max_coalesced_frames = coal->rx_max_coalesced_frames;
 	priv->ethtool.coalesce_usecs       = coal->rx_coalesce_usecs;
 	priv->ethtool.max_coalesced_frames = coal->rx_max_coalesced_frames;