ravb: Factorise ravb_ring_init function

The ravb_ring_init function uses an extended descriptor in RX for
R-Car and normal descriptor for RZ/G2L. Add a helper function
for RX ring buffer allocation to support 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>

diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
index dbf114d..39df045 100644 (file)
--- a/drivers/net/ethernet/renesas/ravb.h
+++ b/drivers/net/ethernet/renesas/ravb.h
@@ -982,6 +982,7 @@ 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);
+       void *(*alloc_rx_desc)(struct net_device *ndev, int q);
        const char (*gstrings_stats)[ETH_GSTRING_LEN];
        size_t gstrings_size;
        netdev_features_t net_hw_features;

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index e52e36c..148c974 100644 (file)
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -355,6 +355,19 @@ static void ravb_ring_format(struct net_device *ndev, int q)
        desc->dptr = cpu_to_le32((u32)priv->tx_desc_dma[q]);
 }
 
+static void *ravb_alloc_rx_desc(struct net_device *ndev, int q)
+{
+       struct ravb_private *priv = netdev_priv(ndev);
+       unsigned int ring_size;
+
+       ring_size = sizeof(struct ravb_ex_rx_desc) * (priv->num_rx_ring[q] + 1);
+
+       priv->rx_ring[q] = dma_alloc_coherent(ndev->dev.parent, ring_size,
+                                             &priv->rx_desc_dma[q],
+                                             GFP_KERNEL);
+       return priv->rx_ring[q];
+}
+
 /* Init skb and descriptor buffer for Ethernet AVB */
 static int ravb_ring_init(struct net_device *ndev, int q)
 {
@@ -390,11 +403,7 @@ static int ravb_ring_init(struct net_device *ndev, int q)
        }
 
        /* Allocate all RX descriptors. */
-       ring_size = sizeof(struct ravb_ex_rx_desc) * (priv->num_rx_ring[q] + 1);
-       priv->rx_ring[q] = dma_alloc_coherent(ndev->dev.parent, ring_size,
-                                             &priv->rx_desc_dma[q],
-                                             GFP_KERNEL);
-       if (!priv->rx_ring[q])
+       if (!info->alloc_rx_desc(ndev, q))
                goto error;
 
        priv->dirty_rx[q] = 0;
@@ -1959,6 +1968,7 @@ 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,
+       .alloc_rx_desc = ravb_alloc_rx_desc,
        .gstrings_stats = ravb_gstrings_stats,
        .gstrings_size = sizeof(ravb_gstrings_stats),
        .net_hw_features = NETIF_F_RXCSUM,
@@ -1974,6 +1984,7 @@ 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,
+       .alloc_rx_desc = ravb_alloc_rx_desc,
        .gstrings_stats = ravb_gstrings_stats,
        .gstrings_size = sizeof(ravb_gstrings_stats),
        .net_hw_features = NETIF_F_RXCSUM,