module_param_named(msg_level, ag71xx_msg_level, int, 0);
MODULE_PARM_DESC(msg_level, "Message level (-1=defaults,0=none,...,16=all)");
+static inline unsigned int ag71xx_max_frame_len(unsigned int mtu)
+{
+ return ETH_HLEN + VLAN_HLEN + mtu + ETH_FCS_LEN;
+}
+
static void ag71xx_dump_dma_regs(struct ag71xx *ag)
{
DBG("%s: dma_tx_ctrl=%08x, dma_tx_desc=%08x, dma_tx_status=%08x\n",
ag71xx_sb(ag, AG71XX_REG_MAC_CFG2,
MAC_CFG2_PAD_CRC_EN | MAC_CFG2_LEN_CHECK);
- /* setup max frame length */
- ag71xx_wr(ag, AG71XX_REG_MAC_MFL, ag->max_frame_len);
+ /* setup max frame length to zero */
+ ag71xx_wr(ag, AG71XX_REG_MAC_MFL, 0);
/* setup FIFO configuration registers */
ag71xx_wr(ag, AG71XX_REG_FIFO_CFG0, FIFO_CFG0_INIT);
ag71xx_dma_reset(ag);
ag71xx_hw_setup(ag);
+ /* setup max frame length */
+ ag71xx_wr(ag, AG71XX_REG_MAC_MFL,
+ ag71xx_max_frame_len(ag->dev->mtu));
+
ag71xx_wr(ag, AG71XX_REG_RX_DESC, rx_ds);
ag71xx_wr(ag, AG71XX_REG_TX_DESC, tx_ds);
ag71xx_wr(ag, AG71XX_REG_MII_CFG, mii_reg);
static int ag71xx_open(struct net_device *dev)
{
struct ag71xx *ag = netdev_priv(dev);
+ unsigned int max_frame_len;
int ret;
- ag->rx_buf_size = AG71XX_RX_PKT_SIZE + NET_SKB_PAD + NET_IP_ALIGN;
+ max_frame_len = ag71xx_max_frame_len(dev->mtu);
+ ag->rx_buf_size = max_frame_len + NET_SKB_PAD + NET_IP_ALIGN;
+
+ /* setup max frame length */
+ ag71xx_wr(ag, AG71XX_REG_MAC_MFL, max_frame_len);
ret = ag71xx_rings_init(ag);
if (ret)
/* setup descriptor fields */
desc->data = (u32) dma_addr;
- desc->ctrl = (skb->len & DESC_PKTLEN_M);
+ desc->ctrl = skb->len & ag->desc_pktlen_mask;
/* flush descriptor */
wmb();
struct net_device *dev = ag->dev;
struct ag71xx_ring *ring = &ag->rx_ring;
int offset = ag71xx_buffer_offset(ag);
+ unsigned int pktlen_mask = ag->desc_pktlen_mask;
int done = 0;
DBG("%s: rx packets, limit=%d, curr=%u, dirty=%u\n",
ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_PR);
- pktlen = ag71xx_desc_pktlen(desc);
+ pktlen = desc->ctrl & pktlen_mask;
pktlen -= ETH_FCS_LEN;
dma_unmap_single(&dev->dev, ring->buf[i].dma_addr,
static int ag71xx_change_mtu(struct net_device *dev, int new_mtu)
{
struct ag71xx *ag = netdev_priv(dev);
+ unsigned int max_frame_len;
- if (new_mtu < 68 ||
- new_mtu > ag->max_frame_len - ETH_HLEN - ETH_FCS_LEN)
+ max_frame_len = ag71xx_max_frame_len(new_mtu);
+ if (new_mtu < 68 || max_frame_len > ag->max_frame_len)
return -EINVAL;
+ if (netif_running(dev))
+ return -EBUSY;
+
dev->mtu = new_mtu;
return 0;
}
goto err_out;
}
+ if (!pdata->max_frame_len || !pdata->desc_pktlen_mask)
+ return -EINVAL;
+
SET_NETDEV_DEV(dev, &pdev->dev);
ag = netdev_priv(dev);
ag->tx_ring.size = AG71XX_TX_RING_SIZE_DEFAULT;
ag->rx_ring.size = AG71XX_RX_RING_SIZE_DEFAULT;
- ag->max_frame_len = AG71XX_TX_MTU_LEN;
+ ag->max_frame_len = pdata->max_frame_len;
+ ag->desc_pktlen_mask = pdata->desc_pktlen_mask;
ag->stop_desc = dma_alloc_coherent(NULL,
sizeof(struct ag71xx_desc), &ag->stop_desc_dma, GFP_KERNEL);