ravb: Factorise ravb_ring_format function

The ravb_ring_format function uses an extended descriptor in RX
for R-Car compared to the normal descriptor for RZ/G2L. Factorise
RX ring buffer buildup to extend the support for later SoC.
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/renesas/ravb.h

@@ -981,6 +981,7 @@ struct ravb_ptp {
 
 struct ravb_hw_info {
 	void (*rx_ring_free)(struct net_device *ndev, int q);
+	void (*rx_ring_format)(struct net_device *ndev, int q);
 	const char (*gstrings_stats)[ETH_GSTRING_LEN];
 	size_t gstrings_size;
 	netdev_features_t net_hw_features;

drivers/net/ethernet/renesas/ravb_main.c

@@ -282,25 +282,14 @@ static void ravb_ring_free(struct net_device *ndev, int q)
 	priv->tx_skb[q] = NULL;
 }
 
-/* Format skb and descriptor buffer for Ethernet AVB */
-static void ravb_ring_format(struct net_device *ndev, int q)
+static void ravb_rx_ring_format(struct net_device *ndev, int q)
 {
 	struct ravb_private *priv = netdev_priv(ndev);
-	unsigned int num_tx_desc = priv->num_tx_desc;
 	struct ravb_ex_rx_desc *rx_desc;
-	struct ravb_tx_desc *tx_desc;
-	struct ravb_desc *desc;
 	unsigned int rx_ring_size = sizeof(*rx_desc) * priv->num_rx_ring[q];
-	unsigned int tx_ring_size = sizeof(*tx_desc) * priv->num_tx_ring[q] *
-				    num_tx_desc;
 	dma_addr_t dma_addr;
 	unsigned int i;
 
-	priv->cur_rx[q] = 0;
-	priv->cur_tx[q] = 0;
-	priv->dirty_rx[q] = 0;
-	priv->dirty_tx[q] = 0;
-
 	memset(priv->rx_ring[q], 0, rx_ring_size);
 	/* Build RX ring buffer */
 	for (i = 0; i < priv->num_rx_ring[q]; i++) {
@@ -321,6 +310,26 @@ static void ravb_ring_format(struct net_device *ndev, int q)
 	rx_desc = &priv->rx_ring[q][i];
 	rx_desc->dptr = cpu_to_le32((u32)priv->rx_desc_dma[q]);
 	rx_desc->die_dt = DT_LINKFIX; /* type */
+}
+
+/* Format skb and descriptor buffer for Ethernet AVB */
+static void ravb_ring_format(struct net_device *ndev, int q)
+{
+	struct ravb_private *priv = netdev_priv(ndev);
+	const struct ravb_hw_info *info = priv->info;
+	unsigned int num_tx_desc = priv->num_tx_desc;
+	struct ravb_tx_desc *tx_desc;
+	struct ravb_desc *desc;
+	unsigned int tx_ring_size = sizeof(*tx_desc) * priv->num_tx_ring[q] *
+				    num_tx_desc;
+	unsigned int i;
+
+	priv->cur_rx[q] = 0;
+	priv->cur_tx[q] = 0;
+	priv->dirty_rx[q] = 0;
+	priv->dirty_tx[q] = 0;
+
+	info->rx_ring_format(ndev, q);
 
 	memset(priv->tx_ring[q], 0, tx_ring_size);
 	/* Build TX ring buffer */
@@ -1949,6 +1958,7 @@ static int ravb_mdio_release(struct ravb_private *priv)
 
 static const struct ravb_hw_info ravb_gen3_hw_info = {
 	.rx_ring_free = ravb_rx_ring_free,
+	.rx_ring_format = ravb_rx_ring_format,
 	.gstrings_stats = ravb_gstrings_stats,
 	.gstrings_size = sizeof(ravb_gstrings_stats),
 	.net_hw_features = NETIF_F_RXCSUM,
@@ -1963,6 +1973,7 @@ static const struct ravb_hw_info ravb_gen3_hw_info = {
 
 static const struct ravb_hw_info ravb_gen2_hw_info = {
 	.rx_ring_free = ravb_rx_ring_free,
+	.rx_ring_format = ravb_rx_ring_format,
 	.gstrings_stats = ravb_gstrings_stats,
 	.gstrings_size = sizeof(ravb_gstrings_stats),
 	.net_hw_features = NETIF_F_RXCSUM,