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authorBen Hutchings <bhutchings@solarflare.com>2009-03-20 13:30:37 +0000
committerDavid S. Miller <davem@davemloft.net>2009-03-21 19:06:58 -0700
commit6fb70fd1b57707a5c7b9fb167b7790b2cba13f04 (patch)
tree311192bd4de07e1da571f1a6ac6a3ad123ab3f50 /drivers/net/sfc/ethtool.c
parent85451a951b9511605475fadcc0a8d3aeccefded8 (diff)
sfc: Implement adaptive IRQ moderation
Calculate a score for each 1000 IRQs: - TX completions are worth 1 point - RX completions are worth 4 if merged using LRO or 2 otherwise Reduce moderation if the score is less than 10000, down to a minimum of 5 us. Increase moderation if the score is more than 20000, up to the specified maximum. Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/sfc/ethtool.c')
-rw-r--r--drivers/net/sfc/ethtool.c19
1 files changed, 6 insertions, 13 deletions
diff --git a/drivers/net/sfc/ethtool.c b/drivers/net/sfc/ethtool.c
index 589d1329296..64309f4e8b1 100644
--- a/drivers/net/sfc/ethtool.c
+++ b/drivers/net/sfc/ethtool.c
@@ -604,7 +604,6 @@ static int efx_ethtool_get_coalesce(struct net_device *net_dev,
{
struct efx_nic *efx = netdev_priv(net_dev);
struct efx_tx_queue *tx_queue;
- struct efx_rx_queue *rx_queue;
struct efx_channel *channel;
memset(coalesce, 0, sizeof(*coalesce));
@@ -622,14 +621,8 @@ static int efx_ethtool_get_coalesce(struct net_device *net_dev,
}
}
- /* Find lowest IRQ moderation across all used RX queues */
- coalesce->rx_coalesce_usecs_irq = ~((u32) 0);
- efx_for_each_rx_queue(rx_queue, efx) {
- channel = rx_queue->channel;
- if (channel->irq_moderation < coalesce->rx_coalesce_usecs_irq)
- coalesce->rx_coalesce_usecs_irq =
- channel->irq_moderation;
- }
+ coalesce->use_adaptive_rx_coalesce = efx->irq_rx_adaptive;
+ coalesce->rx_coalesce_usecs_irq = efx->irq_rx_moderation;
return 0;
}
@@ -643,10 +636,9 @@ static int efx_ethtool_set_coalesce(struct net_device *net_dev,
struct efx_nic *efx = netdev_priv(net_dev);
struct efx_channel *channel;
struct efx_tx_queue *tx_queue;
- unsigned tx_usecs, rx_usecs;
+ unsigned tx_usecs, rx_usecs, adaptive;
- if (coalesce->use_adaptive_rx_coalesce ||
- coalesce->use_adaptive_tx_coalesce)
+ if (coalesce->use_adaptive_tx_coalesce)
return -EOPNOTSUPP;
if (coalesce->rx_coalesce_usecs || coalesce->tx_coalesce_usecs) {
@@ -657,6 +649,7 @@ static int efx_ethtool_set_coalesce(struct net_device *net_dev,
rx_usecs = coalesce->rx_coalesce_usecs_irq;
tx_usecs = coalesce->tx_coalesce_usecs_irq;
+ adaptive = coalesce->use_adaptive_rx_coalesce;
/* If the channel is shared only allow RX parameters to be set */
efx_for_each_tx_queue(tx_queue, efx) {
@@ -668,7 +661,7 @@ static int efx_ethtool_set_coalesce(struct net_device *net_dev,
}
}
- efx_init_irq_moderation(efx, tx_usecs, rx_usecs);
+ efx_init_irq_moderation(efx, tx_usecs, rx_usecs, adaptive);
/* Reset channel to pick up new moderation value. Note that
* this may change the value of the irq_moderation field