diff options
| author | Ben Hutchings <bhutchings@solarflare.com> | 2009-03-20 13:30:37 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-03-21 19:06:58 -0700 |
| commit | 6fb70fd1b57707a5c7b9fb167b7790b2cba13f04 (patch) | |
| tree | 311192bd4de07e1da571f1a6ac6a3ad123ab3f50 /drivers/net/sfc/ethtool.c | |
| parent | 85451a951b9511605475fadcc0a8d3aeccefded8 (diff) | |
| download | blackbird-op-linux-6fb70fd1b57707a5c7b9fb167b7790b2cba13f04.tar.gz blackbird-op-linux-6fb70fd1b57707a5c7b9fb167b7790b2cba13f04.zip | |
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.c | 19 |
1 files changed, 6 insertions, 13 deletions
diff --git a/drivers/net/sfc/ethtool.c b/drivers/net/sfc/ethtool.c index 589d13292969..64309f4e8b19 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 |
