sh_eth: fix RX buffer size alignment

Both  Renesas R-Car and RZ/A1 manuals state that RX buffer  length must be
a multiple of 32 bytes, while the driver  only uses 16 byte granularity...

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 5 deletions

diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
index 257ea713b4c1..d8334d8a53b3 100644
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -1148,8 +1148,8 @@ static void sh_eth_ring_format(struct net_device *ndev)
 
                 /* RX descriptor */
                 rxdesc = &mdp->rx_ring[i];
-                /* The size of the buffer is a multiple of 16 bytes. */
-                rxdesc->buffer_length = ALIGN(mdp->rx_buf_sz, 16);
+                /* The size of the buffer is a multiple of 32 bytes. */
+                rxdesc->buffer_length = ALIGN(mdp->rx_buf_sz, 32);
                 dma_addr = dma_map_single(&ndev->dev, skb->data,
                                           rxdesc->buffer_length,
                                           DMA_FROM_DEVICE);
@@ -1506,7 +1506,7 @@ static int sh_eth_rx(struct net_device *ndev, u32 intr_status, int *quota)
                         if (mdp->cd->rpadir)
                                 skb_reserve(skb, NET_IP_ALIGN);
                         dma_unmap_single(&ndev->dev, rxdesc->addr,
-                                         ALIGN(mdp->rx_buf_sz, 16),
+                                         ALIGN(mdp->rx_buf_sz, 32),
                                          DMA_FROM_DEVICE);
                         skb_put(skb, pkt_len);
                         skb->protocol = eth_type_trans(skb, ndev);
@@ -1524,8 +1524,8 @@ static int sh_eth_rx(struct net_device *ndev, u32 intr_status, int *quota)
         for (; mdp->cur_rx - mdp->dirty_rx > 0; mdp->dirty_rx++) {
                 entry = mdp->dirty_rx % mdp->num_rx_ring;
                 rxdesc = &mdp->rx_ring[entry];
-                /* The size of the buffer is 16 byte boundary. */
-                rxdesc->buffer_length = ALIGN(mdp->rx_buf_sz, 16);
+                /* The size of the buffer is 32 byte boundary. */
+                rxdesc->buffer_length = ALIGN(mdp->rx_buf_sz, 32);
 
                 if (mdp->rx_skbuff[entry] == NULL) {
                         skb = netdev_alloc_skb(ndev, skbuff_size);