Commit 2c2db48a authored by Dai Haruki's avatar Dai Haruki Committed by David S. Miller
Browse files

gianfar: Enable padding and Optimize the frame prepended bytes handling 



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: default avatarDai Haruki <dai.haruki@freescale.com>
Signed-off-by: default avatarAndy Fleming <afleming@freescale.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 77ecaf2d

drivers/net/gianfar.c

+41 −46
Original line number Diff line number Diff line
@@ -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 |
@@ -1668,42 +1670,23 @@ 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;



		/* Prep the skb for the packet */

		skb_put(skb, length);



		/* Grab the FCB if there is one */

		if (gfar_uses_fcb(priv))

			fcb = gfar_get_fcb(skb);

	/* fcb is at the beginning if exists */

	fcb = (struct rxfcb *)skb->data;



	/* Remove the FCB from the skb */

	/* Remove the padded bytes, if there are any */

		if (priv->padding)

			skb_pull(skb, priv->padding);

	if (amount_pull)

		skb_pull(skb, amount_pull);



	if (priv->rx_csum_enable)

		gfar_rx_checksum(skb, fcb);
@@ -1712,15 +1695,13 @@ static int gfar_process_frame(struct net_device *dev, struct sk_buff *skb, 
	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

	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++;

	}



	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++;



			if (likely(skb)) {

				pkt_len = bdp->length - ETH_FCS_LEN;

				/* Remove the FCS from the packet length */

			pkt_len = bdp->length - 4;

				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;

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