net: cdc_ncm: drop ethtool coalesce support

The ethtool coalesce API is not applicable for this driver. Forcing
it to fit the NCM aggregation redefined the API in a driver specific
way, which is much worse than defining a clean new API. These ethtool
coalesce functions have therefore been replaced by a new sysfs API.
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/usb/cdc_ncm.c

@@ -127,54 +127,8 @@ static void cdc_ncm_get_strings(struct net_device __always_unused *netdev, u32 s
 	}
 }
 
-static int cdc_ncm_get_coalesce(struct net_device *netdev,
-				struct ethtool_coalesce *ec)
-{
-	struct usbnet *dev = netdev_priv(netdev);
-	struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
-
-	/* assuming maximum sized dgrams and ignoring NDPs */
-	ec->rx_max_coalesced_frames = ctx->rx_max / ctx->max_datagram_size;
-	ec->tx_max_coalesced_frames = ctx->tx_max / ctx->max_datagram_size;
-
-	/* the timer will fire CDC_NCM_TIMER_PENDING_CNT times in a row */
-	ec->tx_coalesce_usecs = ctx->timer_interval / (NSEC_PER_USEC / CDC_NCM_TIMER_PENDING_CNT);
-	return 0;
-}
-
 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx);
 
-static int cdc_ncm_set_coalesce(struct net_device *netdev,
-				struct ethtool_coalesce *ec)
-{
-	struct usbnet *dev = netdev_priv(netdev);
-	struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
-	u32 new_rx_max = ctx->rx_max;
-	u32 new_tx_max = ctx->tx_max;
-
-	/* assuming maximum sized dgrams and a single NDP */
-	if (ec->rx_max_coalesced_frames)
-		new_rx_max = ec->rx_max_coalesced_frames * ctx->max_datagram_size;
-	if (ec->tx_max_coalesced_frames)
-		new_tx_max = ec->tx_max_coalesced_frames * ctx->max_datagram_size;
-
-	if (ec->tx_coalesce_usecs &&
-	    (ec->tx_coalesce_usecs < CDC_NCM_TIMER_INTERVAL_MIN * CDC_NCM_TIMER_PENDING_CNT ||
-	     ec->tx_coalesce_usecs > CDC_NCM_TIMER_INTERVAL_MAX * CDC_NCM_TIMER_PENDING_CNT))
-		return -EINVAL;
-
-	spin_lock_bh(&ctx->mtx);
-	ctx->timer_interval = ec->tx_coalesce_usecs * (NSEC_PER_USEC / CDC_NCM_TIMER_PENDING_CNT);
-	if (!ctx->timer_interval)
-		ctx->tx_timer_pending = 0;
-	spin_unlock_bh(&ctx->mtx);
-
-	/* inform device of new values */
-	if (new_rx_max != ctx->rx_max || new_tx_max != ctx->tx_max)
-		cdc_ncm_update_rxtx_max(dev, new_rx_max, new_tx_max);
-	return 0;
-}
-
 static const struct ethtool_ops cdc_ncm_ethtool_ops = {
 	.get_settings      = usbnet_get_settings,
 	.set_settings      = usbnet_set_settings,
@@ -187,8 +141,6 @@ static const struct ethtool_ops cdc_ncm_ethtool_ops = {
 	.get_sset_count    = cdc_ncm_get_sset_count,
 	.get_strings       = cdc_ncm_get_strings,
 	.get_ethtool_stats = cdc_ncm_get_ethtool_stats,
-	.get_coalesce      = cdc_ncm_get_coalesce,
-	.set_coalesce      = cdc_ncm_set_coalesce,
 };
 
 static u32 cdc_ncm_check_rx_max(struct usbnet *dev, u32 new_rx)