[PATCH] Add ethtool -g support to Spidernet network driver

Add ethtool -g (show ring sizes) support to the Spidernet network driver.
Signed-off-by: James K Lewis <jklewis@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/spider_net.c

@@ -1611,13 +1611,12 @@ spider_net_open(struct net_device *netdev)
 	int result;
 
 	result = -ENOMEM;
-	if (spider_net_init_chain(card, &card->tx_chain,
-			card->descr,
-			PCI_DMA_TODEVICE, tx_descriptors))
+	if (spider_net_init_chain(card, &card->tx_chain, card->descr,
+			PCI_DMA_TODEVICE, card->tx_desc))
 		goto alloc_tx_failed;
 	if (spider_net_init_chain(card, &card->rx_chain,
-			card->descr + tx_descriptors,
-			PCI_DMA_FROMDEVICE, rx_descriptors))
+			card->descr + card->rx_desc,
+			PCI_DMA_FROMDEVICE, card->rx_desc))
 		goto alloc_rx_failed;
 
 	/* allocate rx skbs */
@@ -2005,6 +2004,9 @@ spider_net_setup_netdev(struct spider_net_card *card)
 
 	card->options.rx_csum = SPIDER_NET_RX_CSUM_DEFAULT;
 
+	card->tx_desc = tx_descriptors;
+	card->rx_desc = rx_descriptors;
+
 	spider_net_setup_netdev_ops(netdev);
 
 	netdev->features = NETIF_F_HW_CSUM | NETIF_F_LLTX;

drivers/net/spider_net.h

@@ -440,6 +440,9 @@ struct spider_net_card {
 	/* for ethtool */
 	int msg_enable;
 
+	int rx_desc;
+	int tx_desc;
+
 	struct spider_net_descr descr[0];
 };
 

drivers/net/spider_net_ethtool.c

@@ -130,6 +130,18 @@ spider_net_ethtool_set_tx_csum(struct net_device *netdev, uint32_t data)
         return 0;
 }
 
+static void
+spider_net_ethtool_get_ringparam(struct net_device *netdev,
+				 struct ethtool_ringparam *ering)
+{
+	struct spider_net_card *card = netdev->priv;
+
+	ering->tx_max_pending = SPIDER_NET_TX_DESCRIPTORS_MAX;
+	ering->tx_pending = card->tx_desc;
+	ering->rx_max_pending = SPIDER_NET_RX_DESCRIPTORS_MAX;
+	ering->rx_pending = card->rx_desc;
+}
+
 struct ethtool_ops spider_net_ethtool_ops = {
 	.get_settings		= spider_net_ethtool_get_settings,
 	.get_drvinfo		= spider_net_ethtool_get_drvinfo,
@@ -141,5 +153,6 @@ struct ethtool_ops spider_net_ethtool_ops = {
 	.set_rx_csum		= spider_net_ethtool_set_rx_csum,
 	.get_tx_csum		= spider_net_ethtool_get_tx_csum,
 	.set_tx_csum		= spider_net_ethtool_set_tx_csum,
+	.get_ringparam          = spider_net_ethtool_get_ringparam,
 };