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sfc: get timer configuration from adapter

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On SFN8000 series adapters the MC provides a method to get the timer
quantum and the maximum timer setting. We revert to the old values if the
new call is unavailable.

Signed-off-by: Bert Kenward <bkenward@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bert Kenward
2016-08-11 13:02:36 +01:00
committed by David S. Miller
parent 539de7c524
commit d95e329a55
5 changed files with 125 additions and 33 deletions
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9
drivers/net/ethernet/sfc/efx.c
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@ -1979,12 +1979,13 @@ int efx_init_irq_moderation(struct efx_nic *efx, unsigned int tx_usecs,
bool rx_may_override_tx)
{
struct efx_channel *channel;
unsigned int irq_mod_max = DIV_ROUND_UP(efx->type->timer_period_max *
efx->timer_quantum_ns,
1000);
unsigned int timer_max_us;
EFX_ASSERT_RESET_SERIALISED(efx);
if (tx_usecs > irq_mod_max || rx_usecs > irq_mod_max)
timer_max_us = efx->timer_max_ns / 1000;
if (tx_usecs > timer_max_us || rx_usecs > timer_max_us)
return -EINVAL;
if (tx_usecs != rx_usecs && efx->tx_channel_offset == 0 &&