[IPoIB] Improve ipoib_timeout() output

Use jiffies_to_msecs() so we print a human-readable time so
we don't have to worry about what HZ is configured to, and
print out a few values to make post-mortem analysis easier.

Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/ulp/ipoib/ipoib_main.c

@@ -637,8 +637,11 @@ static void ipoib_timeout(struct net_device *dev)
 {
 	struct ipoib_dev_priv *priv = netdev_priv(dev);
 
-	ipoib_warn(priv, "transmit timeout: latency %ld\n",
-		   jiffies - dev->trans_start);
+	ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
+		   jiffies_to_msecs(jiffies - dev->trans_start));
+	ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
+		   netif_queue_stopped(dev),
+		   priv->tx_head, priv->tx_tail);
 	/* XXX reset QP, etc. */
 }