[PATCH 10/20] net: stmmac: Discard Rx copybreak ethtool setting

[Serge Semin]

Since commit 2af6106ae949 ("net: stmmac: Introducing support for Page
Pool") the mapping and unmapping has been replaced with Pages Pool usage.
The ethtool-tunable config like Rx copy-break is no longer used for
SK-buffers setup. So the ethtool tunable callback since setting/getting the
ETHTOOL_RX_COPYBREAK id doesn't really change anything. Just discard
the ethtool tunable callback then together with the rx_copybreak private
data field.

The same concerns the "rx_zeroc_thresh" member of the device private data,
but the main user has already been removed in commit 2af6106ae949
("net: stmmac: Introducing support for Page Pool") and in
commit d66e67bd4cc7 ("net: stmmac: Remove unused inline function
stmmac_rx_threshold_count").

Signed-off-by: Serge Semin <Sergey.Semin at baikalelectronics.ru>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac.h  |  2 -
 .../ethernet/stmicro/stmmac/stmmac_ethtool.c  | 39 -------------------
 .../net/ethernet/stmicro/stmmac/stmmac_main.c |  4 --
 3 files changed, 45 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index af02d369e641..e444b1b237c0 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -79,7 +79,6 @@ struct stmmac_rx_queue {
 	struct dma_desc *dma_rx ____cacheline_aligned_in_smp;
 	unsigned int cur_rx;
 	unsigned int dirty_rx;
-	u32 rx_zeroc_thresh;
 	dma_addr_t dma_rx_phy;
 	u32 rx_tail_addr;
 	unsigned int state_saved;
@@ -159,7 +158,6 @@ struct stmmac_priv {
 	u32 sarc_type;
 
 	unsigned int dma_buf_sz;
-	unsigned int rx_copybreak;
 	u32 rx_riwt;
 	int hwts_rx_en;
 
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
index 9e54f953634b..0ed287edbc2d 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
@@ -929,43 +929,6 @@ static int stmmac_get_ts_info(struct net_device *dev,
 		return ethtool_op_get_ts_info(dev, info);
 }
 
-static int stmmac_get_tunable(struct net_device *dev,
-			      const struct ethtool_tunable *tuna, void *data)
-{
-	struct stmmac_priv *priv = netdev_priv(dev);
-	int ret = 0;
-
-	switch (tuna->id) {
-	case ETHTOOL_RX_COPYBREAK:
-		*(u32 *)data = priv->rx_copybreak;
-		break;
-	default:
-		ret = -EINVAL;
-		break;
-	}
-
-	return ret;
-}
-
-static int stmmac_set_tunable(struct net_device *dev,
-			      const struct ethtool_tunable *tuna,
-			      const void *data)
-{
-	struct stmmac_priv *priv = netdev_priv(dev);
-	int ret = 0;
-
-	switch (tuna->id) {
-	case ETHTOOL_RX_COPYBREAK:
-		priv->rx_copybreak = *(u32 *)data;
-		break;
-	default:
-		ret = -EINVAL;
-		break;
-	}
-
-	return ret;
-}
-
 static const struct ethtool_ops stmmac_ethtool_ops = {
 	.supported_coalesce_params = ETHTOOL_COALESCE_USECS |
 				     ETHTOOL_COALESCE_MAX_FRAMES,
@@ -999,8 +962,6 @@ static const struct ethtool_ops stmmac_ethtool_ops = {
 	.set_coalesce = stmmac_set_coalesce,
 	.get_channels = stmmac_get_channels,
 	.set_channels = stmmac_set_channels,
-	.get_tunable = stmmac_get_tunable,
-	.set_tunable = stmmac_set_tunable,
 	.get_link_ksettings = stmmac_ethtool_get_link_ksettings,
 	.set_link_ksettings = stmmac_ethtool_set_link_ksettings,
 };
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 3bc07f5b64e1..8599ef6df52f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -84,8 +84,6 @@ static int buf_sz = DEFAULT_BUFSIZE;
 module_param(buf_sz, int, 0644);
 MODULE_PARM_DESC(buf_sz, "DMA buffer size");
 
-#define	STMMAC_RX_COPYBREAK	256
-
 static const u32 default_msg_level = (NETIF_MSG_DRV | NETIF_MSG_PROBE |
 				      NETIF_MSG_LINK | NETIF_MSG_IFUP |
 				      NETIF_MSG_IFDOWN | NETIF_MSG_TIMER);
@@ -2831,8 +2829,6 @@ static int stmmac_open(struct net_device *dev)
 	priv->dma_buf_sz = bfsize;
 	buf_sz = bfsize;
 
-	priv->rx_copybreak = STMMAC_RX_COPYBREAK;
-
 	if (!priv->dma_tx_size)
 		priv->dma_tx_size = DMA_DEFAULT_TX_SIZE;
 	if (!priv->dma_rx_size)
-- 
2.29.2