[PATCH] spidernet: performance optimizations

Performance optimizations, changes in these areas:
  - RX and TX checksum offload
  - correct maximum MTU
  - don't use TX interrupts anymore, use a timer instead
  - remove some superfluous barriers
  - improve RX RAM full handling

From: Utz Bacher <utz.bacher@de.ibm.com>
Signed-off-by: Jens Osterkamp <jens.osterkamp@de.ibm.com>
Signed-off-by: Arnd Bergmann <arndb@de.ibm.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/net/spider_net_ethtool.c b/drivers/net/spider_net_ethtool.c
index d42e60ba74ce..a5bb0b7633af 100644
--- a/drivers/net/spider_net_ethtool.c
+++ b/drivers/net/spider_net_ethtool.c
@@ -113,6 +113,23 @@ spider_net_ethtool_set_rx_csum(struct net_device *netdev, u32 n)
         return 0;
 }
 
+static uint32_t
+spider_net_ethtool_get_tx_csum(struct net_device *netdev)
+{
+        return (netdev->features & NETIF_F_HW_CSUM) != 0;
+}
+
+static int
+spider_net_ethtool_set_tx_csum(struct net_device *netdev, uint32_t data)
+{
+        if (data)
+                netdev->features |= NETIF_F_HW_CSUM;
+        else
+                netdev->features &= ~NETIF_F_HW_CSUM;
+
+        return 0;
+}
+
 struct ethtool_ops spider_net_ethtool_ops = {
         .get_settings           = spider_net_ethtool_get_settings,
         .get_drvinfo            = spider_net_ethtool_get_drvinfo,
@@ -122,5 +139,7 @@ struct ethtool_ops spider_net_ethtool_ops = {
         .nway_reset             = spider_net_ethtool_nway_reset,
         .get_rx_csum            = spider_net_ethtool_get_rx_csum,
         .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,
 };