8139cp: Dump contents of descriptor ring on TX timeout
We are seeing unexplained TX timeouts under heavy load. Let's try to get a better idea of what's going on. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -157,6 +157,7 @@ enum {
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NWayAdvert = 0x66, /* MII ADVERTISE */
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NWayLPAR = 0x68, /* MII LPA */
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NWayExpansion = 0x6A, /* MII Expansion */
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TxDmaOkLowDesc = 0x82, /* Low 16 bit address of a Tx descriptor. */
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Config5 = 0xD8, /* Config5 */
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TxPoll = 0xD9, /* Tell chip to check Tx descriptors for work */
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RxMaxSize = 0xDA, /* Max size of an Rx packet (8169 only) */
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@ -1234,7 +1235,7 @@ static void cp_tx_timeout(struct net_device *dev)
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{
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struct cp_private *cp = netdev_priv(dev);
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unsigned long flags;
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int rc;
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int rc, i;
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netdev_warn(dev, "Transmit timeout, status %2x %4x %4x %4x\n",
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cpr8(Cmd), cpr16(CpCmd),
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@ -1242,6 +1243,17 @@ static void cp_tx_timeout(struct net_device *dev)
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spin_lock_irqsave(&cp->lock, flags);
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netif_dbg(cp, tx_err, cp->dev, "TX ring head %d tail %d desc %x\n",
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cp->tx_head, cp->tx_tail, cpr16(TxDmaOkLowDesc));
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for (i = 0; i < CP_TX_RING_SIZE; i++) {
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netif_dbg(cp, tx_err, cp->dev,
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"TX slot %d @%p: %08x (%08x) %08x %llx %p\n",
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i, &cp->tx_ring[i], le32_to_cpu(cp->tx_ring[i].opts1),
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cp->tx_opts[i], le32_to_cpu(cp->tx_ring[i].opts2),
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le64_to_cpu(cp->tx_ring[i].addr),
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cp->tx_skb[i]);
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}
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cp_stop_hw(cp);
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cp_clean_rings(cp);
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rc = cp_init_rings(cp);
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