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merger mtu/802.1q related fixes: bcm63xx integrated ethernet mac supports receiving and sending frames bigger than 1500 bytes, this patch adds support for changing MTU.

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This patch also fixes the reception of 802.1q frames for default MTU
which were reported as oversized.

SVN-Revision: 16302
This commit is contained in:
Florian Fainelli 2009-06-03 08:55:18 +00:00
parent 0efe367787
commit d2b2ce325a
2 changed files with 76 additions and 11 deletions
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72
target/linux/brcm63xx/files/drivers/net/bcm63xx_enet.c
View File

@ -27,6 +27,7 @@
#include <linux/err.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/if_vlan.h>
#include <bcm63xx_dev_enet.h>
#include "bcm63xx_enet.h"
@ -189,18 +190,18 @@ static int bcm_enet_refill_rx(struct net_device *dev)
desc = &priv->rx_desc_cpu[desc_idx];
if (!priv->rx_skb[desc_idx]) {
skb = netdev_alloc_skb(dev, BCMENET_MAX_RX_SIZE);
skb = netdev_alloc_skb(dev, priv->rx_skb_size);
if (!skb)
break;
priv->rx_skb[desc_idx] = skb;
p = dma_map_single(&priv->pdev->dev, skb->data,
BCMENET_MAX_RX_SIZE,
priv->rx_skb_size,
DMA_FROM_DEVICE);
desc->address = p;
}
len_stat = BCMENET_MAX_RX_SIZE << DMADESC_LENGTH_SHIFT;
len_stat = priv->rx_skb_size << DMADESC_LENGTH_SHIFT;
len_stat |= DMADESC_OWNER_MASK;
if (priv->rx_dirty_desc == priv->rx_ring_size - 1) {
len_stat |= DMADESC_WRAP_MASK;
@ -337,7 +338,7 @@ static int bcm_enet_receive_queue(struct net_device *dev, int budget)
skb = nskb;
} else {
dma_unmap_single(&priv->pdev->dev, desc->address,
BCMENET_MAX_RX_SIZE, DMA_FROM_DEVICE);
priv->rx_skb_size, DMA_FROM_DEVICE);
priv->rx_skb[desc_idx] = NULL;
}
@ -949,8 +950,8 @@ static int bcm_enet_open(struct net_device *dev)
enet_dma_writel(priv, 0, ENETDMA_SRAM4_REG(priv->tx_chan));
/* set max rx/tx length */
enet_writel(priv, BCMENET_MAX_RX_SIZE, ENET_RXMAXLEN_REG);
enet_writel(priv, BCMENET_MAX_TX_SIZE, ENET_TXMAXLEN_REG);
enet_writel(priv, priv->hw_mtu, ENET_RXMAXLEN_REG);
enet_writel(priv, priv->hw_mtu, ENET_TXMAXLEN_REG);
/* set dma maximum burst len */
enet_dma_writel(priv, BCMENET_DMA_MAXBURST,
@ -1016,7 +1017,7 @@ out:
continue;
desc = &priv->rx_desc_cpu[i];
dma_unmap_single(kdev, desc->address, BCMENET_MAX_RX_SIZE,
dma_unmap_single(kdev, desc->address, priv->rx_skb_size,
DMA_FROM_DEVICE);
kfree_skb(priv->rx_skb[i]);
}
@ -1116,7 +1117,7 @@ static int bcm_enet_stop(struct net_device *dev)
continue;
desc = &priv->rx_desc_cpu[i];
dma_unmap_single(kdev, desc->address, BCMENET_MAX_RX_SIZE,
dma_unmap_single(kdev, desc->address, priv->rx_skb_size,
DMA_FROM_DEVICE);
kfree_skb(priv->rx_skb[i]);
}
@ -1505,6 +1506,55 @@ static int bcm_enet_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
}
}
/*
* calculate actual hardware mtu
*/
static int compute_hw_mtu(struct bcm_enet_priv *priv, int mtu)
{
int actual_mtu;
actual_mtu = mtu;
/* add ethernet header + vlan tag size */
actual_mtu += VLAN_ETH_HLEN;
if (actual_mtu < 64 || actual_mtu > BCMENET_MAX_MTU)
return -EINVAL;
/*
* setup maximum size before we get overflow mark in
* descriptor, note that this will not prevent reception of
* big frames, they will be split into multiple buffers
* anyway
*/
priv->hw_mtu = actual_mtu;
/*
* align rx buffer size to dma burst len, account FCS since
* it's appended
*/
priv->rx_skb_size = ALIGN(actual_mtu + ETH_FCS_LEN,
BCMENET_DMA_MAXBURST * 4);
return 0;
}
/*
* adjust mtu, can't be called while device is running
*/
static int bcm_enet_change_mtu(struct net_device *dev, int new_mtu)
{
int ret;
if (netif_running(dev))
return -EBUSY;
ret = compute_hw_mtu(netdev_priv(dev), new_mtu);
if (ret)
return ret;
dev->mtu = new_mtu;
return 0;
}
/*
* preinit hardware to allow mii operation while device is down
*/
@ -1582,6 +1632,10 @@ static int __devinit bcm_enet_probe(struct platform_device *pdev)
priv = netdev_priv(dev);
memset(priv, 0, sizeof(*priv));
ret = compute_hw_mtu(priv, dev->mtu);
if (ret)
goto out;
iomem_size = res_mem->end - res_mem->start + 1;
if (!request_mem_region(res_mem->start, iomem_size, "bcm63xx_enet")) {
ret = -EBUSY;
@ -1721,6 +1775,7 @@ static int __devinit bcm_enet_probe(struct platform_device *pdev)
#ifdef CONFIG_NET_POLL_CONTROLLER
dev->poll_controller = bcm_enet_netpoll;
#endif
dev->change_mtu = bcm_enet_change_mtu;
SET_ETHTOOL_OPS(dev, &bcm_enet_ethtool_ops);
@ -1754,6 +1809,7 @@ err:
enet_writel(priv, 0, ENET_MIISC_REG);
iounmap(priv->base);
}
out:
free_netdev(dev);
return ret;
}

15
target/linux/brcm63xx/files/drivers/net/bcm63xx_enet.h
View File

@ -23,9 +23,12 @@
* not overflow the fifo */
#define BCMENET_TX_FIFO_TRESH 32
/* maximum rx/tx packet size */
#define BCMENET_MAX_RX_SIZE (ETH_FRAME_LEN + 4)
#define BCMENET_MAX_TX_SIZE (ETH_FRAME_LEN + 4)
/*
* hardware maximum rx/tx packet size including FCS, max mtu is
* actually 2047, but if we set max rx size register to 2047 we won't
* get overflow information if packet size is 2048 or above
*/
#define BCMENET_MAX_MTU 2046
/*
* rx/tx dma descriptor
@ -202,6 +205,9 @@ struct bcm_enet_priv {
/* next dirty rx descriptor to refill */
int rx_dirty_desc;
/* size of allocated rx skbs */
unsigned int rx_skb_size;
/* list of skb given to hw for rx */
struct sk_buff **rx_skb;
@ -289,6 +295,9 @@ struct bcm_enet_priv {
/* platform device reference */
struct platform_device *pdev;
/* maximum hardware transmit/receive size */
unsigned int hw_mtu;
};
#endif /* ! BCM63XX_ENET_H_ */