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

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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: Fugang Duan <B38611@freescale.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Russell King 2014-07-08 13:01:59 +01:00 committed by David S. Miller
parent c1d7c48ff7
commit 344756f6e3
1 changed files with 23 additions and 0 deletions
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23
drivers/net/ethernet/freescale/fec_main.c
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@ -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);