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gianfar: Enable padding and Optimize the frame prepended bytes handling

Browse source 
The eTSEC can prepend up to 32 bytes to a received frame, usually for the
purpose of aligning the IP address to a word boundary, so this turns it on.

While we're in there, make the handling of the pre-frame bytes (padding and
Frame Control Block) cleaner.

Signed-off-by: Dai Haruki <dai.haruki@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dai Haruki 2008-12-16 15:31:15 -08:00 committed by David S. Miller
parent 77ecaf2d5a
commit 2c2db48acb
1 changed files with 41 additions and 46 deletions
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87
drivers/net/gianfar.c
View file

@ -131,7 +131,8 @@ static void gfar_netpoll(struct net_device *dev);
#endif
int gfar_clean_rx_ring(struct net_device *dev, int rx_work_limit);
static int gfar_clean_tx_ring(struct net_device *dev);
static int gfar_process_frame(struct net_device *dev, struct sk_buff *skb, int length);
static int gfar_process_frame(struct net_device *dev, struct sk_buff *skb,
int amount_pull);
static void gfar_vlan_rx_register(struct net_device *netdev,
struct vlan_group *grp);
void gfar_halt(struct net_device *dev);
@ -210,6 +211,7 @@ static int gfar_of_init(struct net_device *dev)
FSL_GIANFAR_DEV_HAS_COALESCE |
FSL_GIANFAR_DEV_HAS_RMON |
FSL_GIANFAR_DEV_HAS_MULTI_INTR |
FSL_GIANFAR_DEV_HAS_PADDING |
FSL_GIANFAR_DEV_HAS_CSUM |
FSL_GIANFAR_DEV_HAS_VLAN |
FSL_GIANFAR_DEV_HAS_MAGIC_PACKET |
@ -1668,59 +1670,38 @@ static inline void gfar_rx_checksum(struct sk_buff *skb, struct rxfcb *fcb)
}
static inline struct rxfcb *gfar_get_fcb(struct sk_buff *skb)
{
struct rxfcb *fcb = (struct rxfcb *)skb->data;
/* Remove the FCB from the skb */
skb_pull(skb, GMAC_FCB_LEN);
return fcb;
}
/* gfar_process_frame() -- handle one incoming packet if skb
* isn't NULL. */
static int gfar_process_frame(struct net_device *dev, struct sk_buff *skb,
int length)
int amount_pull)
{
struct gfar_private *priv = netdev_priv(dev);
struct rxfcb *fcb = NULL;
if (NULL == skb) {
if (netif_msg_rx_err(priv))
printk(KERN_WARNING "%s: Missing skb!!.\n", dev->name);
dev->stats.rx_dropped++;
priv->extra_stats.rx_skbmissing++;
} else {
int ret;
int ret;
/* Prep the skb for the packet */
skb_put(skb, length);
/* fcb is at the beginning if exists */
fcb = (struct rxfcb *)skb->data;
/* Grab the FCB if there is one */
if (gfar_uses_fcb(priv))
fcb = gfar_get_fcb(skb);
/* Remove the FCB from the skb */
/* Remove the padded bytes, if there are any */
if (amount_pull)
skb_pull(skb, amount_pull);
/* Remove the padded bytes, if there are any */
if (priv->padding)
skb_pull(skb, priv->padding);
if (priv->rx_csum_enable)
gfar_rx_checksum(skb, fcb);
if (priv->rx_csum_enable)
gfar_rx_checksum(skb, fcb);
/* Tell the skb what kind of packet this is */
skb->protocol = eth_type_trans(skb, dev);
/* Tell the skb what kind of packet this is */
skb->protocol = eth_type_trans(skb, dev);
/* Send the packet up the stack */
if (unlikely(priv->vlgrp && (fcb->flags & RXFCB_VLN)))
ret = vlan_hwaccel_receive_skb(skb, priv->vlgrp, fcb->vlctl);
else
ret = netif_receive_skb(skb);
/* Send the packet up the stack */
if (unlikely(priv->vlgrp && (fcb->flags & RXFCB_VLN))) {
ret = vlan_hwaccel_receive_skb(skb, priv->vlgrp,
fcb->vlctl);
} else
ret = netif_receive_skb(skb);
if (NET_RX_DROP == ret)
priv->extra_stats.kernel_dropped++;
}
if (NET_RX_DROP == ret)
priv->extra_stats.kernel_dropped++;
return 0;
}
@ -1733,13 +1714,17 @@ int gfar_clean_rx_ring(struct net_device *dev, int rx_work_limit)
{
struct rxbd8 *bdp;
struct sk_buff *skb;
u16 pkt_len;
int pkt_len;
int amount_pull;
int howmany = 0;
struct gfar_private *priv = netdev_priv(dev);
/* Get the first full descriptor */
bdp = priv->cur_rx;
amount_pull = (gfar_uses_fcb(priv) ? GMAC_FCB_LEN : 0) +
priv->padding;
while (!((bdp->status & RXBD_EMPTY) || (--rx_work_limit < 0))) {
struct sk_buff *newskb;
rmb();
@ -1767,12 +1752,22 @@ int gfar_clean_rx_ring(struct net_device *dev, int rx_work_limit)
dev->stats.rx_packets++;
howmany++;
/* Remove the FCS from the packet length */
pkt_len = bdp->length - 4;
if (likely(skb)) {
pkt_len = bdp->length - ETH_FCS_LEN;
/* Remove the FCS from the packet length */
skb_put(skb, pkt_len);
dev->stats.rx_bytes += pkt_len;
gfar_process_frame(dev, skb, pkt_len);
gfar_process_frame(dev, skb, amount_pull);
} else {
if (netif_msg_rx_err(priv))
printk(KERN_WARNING
"%s: Missing skb!\n", dev->name);
dev->stats.rx_dropped++;
priv->extra_stats.rx_skbmissing++;
}
dev->stats.rx_bytes += pkt_len;
}
priv->rx_skbuff[priv->skb_currx] = newskb;