bgmac: configure MTU and add support for frames beyond 8192 byte size

Change DMA descriptor length to handle jumbo frames beyond 8192 bytes.
Also update jumbo frame max size to include FCS, the DMA packet length
received includes FCS.

Signed-off-by: Murali Krishna Policharla <murali.policharla@broadcom.com>
Reviewed-by: Arun Parameswaran <arun.parameswaran@broadcom.com>
Reviewed-by: Ray Jui <ray.jui@broadcom.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/bgmac.c b/drivers/net/ethernet/broadcom/bgmac.c
index 1bb07a5..98ec1b8 100644 (file)
--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -1248,6 +1248,14 @@ static int bgmac_set_mac_address(struct net_device *net_dev, void *addr)
        return 0;
 }
 
+static int bgmac_change_mtu(struct net_device *net_dev, int mtu)
+{
+       struct bgmac *bgmac = netdev_priv(net_dev);
+
+       bgmac_write(bgmac, BGMAC_RXMAX_LENGTH, 32 + mtu);
+       return 0;
+}
+
 static const struct net_device_ops bgmac_netdev_ops = {
        .ndo_open               = bgmac_open,
        .ndo_stop               = bgmac_stop,
@@ -1256,6 +1264,7 @@ static const struct net_device_ops bgmac_netdev_ops = {
        .ndo_set_mac_address    = bgmac_set_mac_address,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_do_ioctl           = phy_do_ioctl_running,
+       .ndo_change_mtu         = bgmac_change_mtu,
 };
 
 /**************************************************
@@ -1530,6 +1539,9 @@ int bgmac_enet_probe(struct bgmac *bgmac)
        net_dev->hw_features = net_dev->features;
        net_dev->vlan_features = net_dev->features;
 
+       /* Omit FCS from max MTU size */
+       net_dev->max_mtu = BGMAC_RX_MAX_FRAME_SIZE - ETH_FCS_LEN;
+
        err = register_netdev(bgmac->net_dev);
        if (err) {
                dev_err(bgmac->dev, "Cannot register net device\n");

diff --git a/drivers/net/ethernet/broadcom/bgmac.h b/drivers/net/ethernet/broadcom/bgmac.h
index 40d02fe..351c598 100644 (file)
--- a/drivers/net/ethernet/broadcom/bgmac.h
+++ b/drivers/net/ethernet/broadcom/bgmac.h
@@ -351,7 +351,7 @@
 #define BGMAC_DESC_CTL0_IOC                    0x20000000      /* IRQ on complete */
 #define BGMAC_DESC_CTL0_EOF                    0x40000000      /* End of frame */
 #define BGMAC_DESC_CTL0_SOF                    0x80000000      /* Start of frame */
-#define BGMAC_DESC_CTL1_LEN                    0x00001FFF
+#define BGMAC_DESC_CTL1_LEN                    0x00003FFF
 
 #define BGMAC_PHY_NOREGS                       BRCM_PSEUDO_PHY_ADDR
 #define BGMAC_PHY_MASK                         0x1F
@@ -366,7 +366,8 @@
 #define BGMAC_RX_FRAME_OFFSET                  30              /* There are 2 unused bytes between header and real data */
 #define BGMAC_RX_BUF_OFFSET                    (NET_SKB_PAD + NET_IP_ALIGN - \
                                                 BGMAC_RX_FRAME_OFFSET)
-#define BGMAC_RX_MAX_FRAME_SIZE                        1536            /* Copied from b44/tg3 */
+/* Jumbo frame size with FCS */
+#define BGMAC_RX_MAX_FRAME_SIZE                        9724
 #define BGMAC_RX_BUF_SIZE                      (BGMAC_RX_FRAME_OFFSET + BGMAC_RX_MAX_FRAME_SIZE)
 #define BGMAC_RX_ALLOC_SIZE                    (SKB_DATA_ALIGN(BGMAC_RX_BUF_SIZE + BGMAC_RX_BUF_OFFSET) + \
                                                 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))