net: ravb: Fix R-Car RX frame size limit

The RX frame size limit should not be based on the current MTU setting.
Instead it should be based on the hardware capabilities.

While we're here, improve the description of the receive frame length
setting as suggested by Niklas.

Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper")
Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index e73cdba58516554b262d60176867d846eb80fd5d..d2a6518532f37a6b3143eb99fea42e0bf568f1fc 100644 (file)
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -555,8 +555,16 @@ static void ravb_emac_init_gbeth(struct net_device *ndev)
 
 static void ravb_emac_init_rcar(struct net_device *ndev)
 {
-       /* Receive frame limit set register */
-       ravb_write(ndev, ndev->mtu + ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN, RFLR);
+       struct ravb_private *priv = netdev_priv(ndev);
+
+       /* Set receive frame length
+        *
+        * The length set here describes the frame from the destination address
+        * up to and including the CRC data. However only the frame data,
+        * excluding the CRC, are transferred to memory. To allow for the
+        * largest frames add the CRC length to the maximum Rx descriptor size.
+        */
+       ravb_write(ndev, priv->info->rx_max_frame_size + ETH_FCS_LEN, RFLR);
 
        /* EMAC Mode: PAUSE prohibition; Duplex; RX Checksum; TX; RX */
        ravb_write(ndev, ECMR_ZPF | ECMR_DM |