netxen: support for ethtool set ringparam

Add support for ethtool -G to tune rx and tx ring sizes
per interface basis.

This is only supported for NX3031 based cards.

Signed-off-by: Amit Kumar Salecha <amit@netxen.com>
Signed-off-by: Dhananjay Phadke <dhananjay@netxen.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 59 insertions, 1 deletions

diff --git a/drivers/net/netxen/netxen_nic_ethtool.c b/drivers/net/netxen/netxen_nic_ethtool.c
index 80d286db8eb4..39a308c363c7 100644
--- a/drivers/net/netxen/netxen_nic_ethtool.c
+++ b/drivers/net/netxen/netxen_nic_ethtool.c
@@ -490,7 +490,8 @@ netxen_nic_get_eeprom(struct net_device *dev, struct ethtool_eeprom *eeprom,
 }
 
 static void
-netxen_nic_get_ringparam(struct net_device *dev, struct ethtool_ringparam *ring)
+netxen_nic_get_ringparam(struct net_device *dev,
+                struct ethtool_ringparam *ring)
 {
         struct netxen_adapter *adapter = netdev_priv(dev);
 
@@ -513,6 +514,62 @@ netxen_nic_get_ringparam(struct net_device *dev, struct ethtool_ringparam *ring)
         ring->rx_mini_pending = 0;
 }
 
+static u32
+netxen_validate_ringparam(u32 val, u32 min, u32 max, char *r_name)
+{
+        u32 num_desc;
+        num_desc = max(val, min);
+        num_desc = min(num_desc, max);
+        num_desc = roundup_pow_of_two(num_desc);
+
+        if (val != num_desc) {
+                printk(KERN_INFO "%s: setting %s ring size %d instead of %d\n",
+                       netxen_nic_driver_name, r_name, num_desc, val);
+        }
+
+        return num_desc;
+}
+
+static int
+netxen_nic_set_ringparam(struct net_device *dev,
+                struct ethtool_ringparam *ring)
+{
+        struct netxen_adapter *adapter = netdev_priv(dev);
+        u16 max_rcv_desc = MAX_RCV_DESCRIPTORS_10G;
+        u16 max_jumbo_desc = MAX_JUMBO_RCV_DESCRIPTORS_10G;
+        u16 num_rxd, num_jumbo_rxd, num_txd;
+
+        if (NX_IS_REVISION_P2(adapter->ahw.revision_id))
+                return -EOPNOTSUPP;
+
+        if (ring->rx_mini_pending)
+                return -EOPNOTSUPP;
+
+        if (adapter->ahw.port_type == NETXEN_NIC_GBE) {
+                max_rcv_desc = MAX_RCV_DESCRIPTORS_1G;
+                max_jumbo_desc = MAX_JUMBO_RCV_DESCRIPTORS_10G;
+        }
+
+        num_rxd = netxen_validate_ringparam(ring->rx_pending,
+                        MIN_RCV_DESCRIPTORS, max_rcv_desc, "rx");
+
+        num_jumbo_rxd = netxen_validate_ringparam(ring->rx_jumbo_pending,
+                        MIN_JUMBO_DESCRIPTORS, max_jumbo_desc, "rx jumbo");
+
+        num_txd = netxen_validate_ringparam(ring->tx_pending,
+                        MIN_CMD_DESCRIPTORS, MAX_CMD_DESCRIPTORS, "tx");
+
+        if (num_rxd == adapter->num_rxd && num_txd == adapter->num_txd &&
+                        num_jumbo_rxd == adapter->num_jumbo_rxd)
+                return 0;
+
+        adapter->num_rxd = num_rxd;
+        adapter->num_jumbo_rxd = num_jumbo_rxd;
+        adapter->num_txd = num_txd;
+
+        return netxen_nic_reset_context(adapter);
+}
+
 static void
 netxen_nic_get_pauseparam(struct net_device *dev,
                           struct ethtool_pauseparam *pause)
@@ -894,6 +951,7 @@ struct ethtool_ops netxen_nic_ethtool_ops = {
         .get_eeprom_len = netxen_nic_get_eeprom_len,
         .get_eeprom = netxen_nic_get_eeprom,
         .get_ringparam = netxen_nic_get_ringparam,
+        .set_ringparam = netxen_nic_set_ringparam,
         .get_pauseparam = netxen_nic_get_pauseparam,
         .set_pauseparam = netxen_nic_set_pauseparam,
         .set_tx_csum = ethtool_op_set_tx_csum,