sfc: Allow changing the DMA ring sizes dynamically via ethtool

[mv-sheeva.git] / drivers / net / sfc / ethtool.c

diff --git a/drivers/net/sfc/ethtool.c b/drivers/net/sfc/ethtool.c
index b9291db023bbfdf6172d9e2904b0120999935eba..7f735d804801eea9087c4b4a4336dbdeb6c0334f 100644 (file)
--- a/drivers/net/sfc/ethtool.c
+++ b/drivers/net/sfc/ethtool.c
@@ -742,6 +742,42 @@ static int efx_ethtool_set_coalesce(struct net_device *net_dev,
        return 0;
 }
 
+static void efx_ethtool_get_ringparam(struct net_device *net_dev,
+                                     struct ethtool_ringparam *ring)
+{
+       struct efx_nic *efx = netdev_priv(net_dev);
+
+       ring->rx_max_pending = EFX_MAX_DMAQ_SIZE;
+       ring->tx_max_pending = EFX_MAX_DMAQ_SIZE;
+       ring->rx_mini_max_pending = 0;
+       ring->rx_jumbo_max_pending = 0;
+       ring->rx_pending = efx->rxq_entries;
+       ring->tx_pending = efx->txq_entries;
+       ring->rx_mini_pending = 0;
+       ring->rx_jumbo_pending = 0;
+}
+
+static int efx_ethtool_set_ringparam(struct net_device *net_dev,
+                                    struct ethtool_ringparam *ring)
+{
+       struct efx_nic *efx = netdev_priv(net_dev);
+
+       if (ring->rx_mini_pending || ring->rx_jumbo_pending ||
+           ring->rx_pending > EFX_MAX_DMAQ_SIZE ||
+           ring->tx_pending > EFX_MAX_DMAQ_SIZE)
+               return -EINVAL;
+
+       if (ring->rx_pending < EFX_MIN_RING_SIZE ||
+           ring->tx_pending < EFX_MIN_RING_SIZE) {
+               netif_err(efx, drv, efx->net_dev,
+                         "TX and RX queues cannot be smaller than %ld\n",
+                         EFX_MIN_RING_SIZE);
+               return -EINVAL;
+       }
+
+       return efx_realloc_channels(efx, ring->rx_pending, ring->tx_pending);
+}
+
 static int efx_ethtool_set_pauseparam(struct net_device *net_dev,
                                      struct ethtool_pauseparam *pause)
 {
@@ -972,6 +1008,8 @@ const struct ethtool_ops efx_ethtool_ops = {
        .set_eeprom             = efx_ethtool_set_eeprom,
        .get_coalesce           = efx_ethtool_get_coalesce,
        .set_coalesce           = efx_ethtool_set_coalesce,
+       .get_ringparam          = efx_ethtool_get_ringparam,
+       .set_ringparam          = efx_ethtool_set_ringparam,
        .get_pauseparam         = efx_ethtool_get_pauseparam,
        .set_pauseparam         = efx_ethtool_set_pauseparam,
        .get_rx_csum            = efx_ethtool_get_rx_csum,