Commit 344756f6 authored by Russell King's avatar Russell King Committed by David S. Miller
Browse files

net: fec: add support for dumping transmit ring on timeout 



When we timeout on transmit, it would be useful to dump the transmit
ring, so we can see the ring state.  This can be helpful to diagnose
the cause of transmit timeouts.

Acked-by: default avatarFugang Duan <B38611@freescale.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c1d7c48f

drivers/net/ethernet/freescale/fec_main.c

+23 −0
Original line number Diff line number Diff line
@@ -320,6 +320,27 @@ static void *swap_buffer(void *bufaddr, int len) 
	return bufaddr;

}



static void fec_dump(struct net_device *ndev)

{

	struct fec_enet_private *fep = netdev_priv(ndev);

	struct bufdesc *bdp = fep->tx_bd_base;

	unsigned int index = 0;



	netdev_info(ndev, "TX ring dump\n");

	pr_info("Nr     SC     addr       len  SKB\n");



	do {

		pr_info("%3u %c%c 0x%04x 0x%08lx %4u %p\n",

			index,

			bdp == fep->cur_tx ? 'S' : ' ',

			bdp == fep->dirty_tx ? 'H' : ' ',

			bdp->cbd_sc, bdp->cbd_bufaddr, bdp->cbd_datlen,

			fep->tx_skbuff[index]);

		bdp = fec_enet_get_nextdesc(bdp, fep);

		index++;

	} while (bdp != fep->tx_bd_base);

}



static inline bool is_ipv4_pkt(struct sk_buff *skb)

{

	return skb->protocol == htons(ETH_P_IP) && ip_hdr(skb)->version == 4;
@@ -1018,6 +1039,8 @@ fec_timeout(struct net_device *ndev) 
{

	struct fec_enet_private *fep = netdev_priv(ndev);



	fec_dump(ndev);



	ndev->stats.tx_errors++;



	schedule_work(&fep->tx_timeout_work);

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