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sfc: Correct interrupt timer quantum for Siena (normal and turbo mode)

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We currently assume that the timer quantum for Siena is 5 us, the same
as for Falcon.  This is not correct; timer ticks are generated on a
rota which takes a minimum of 768 cycles (each event delivery or other
timer change will delay it by 3 cycles).  The timer quantum should be
6.144 or 3.072 us depending on whether turbo mode is active.

Replace EFX_IRQ_MOD_RESOLUTION with a timer_quantum_ns field in struct
efx_nic, initialised by the efx_nic_type::probe function.

While we're at it, replace EFX_IRQ_MOD_MAX with a timer_period_max
field in struct efx_nic_type.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Ben Hutchings
2011-12-08 19:51:47 +00:00
parent 6aa9c7f625
commit cc180b69c0
5 changed files with 40 additions and 17 deletions
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3
drivers/net/ethernet/sfc/nic.h
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@@ -205,9 +205,6 @@ extern irqreturn_t efx_nic_fatal_interrupt(struct efx_nic *efx);
extern irqreturn_t falcon_legacy_interrupt_a1(int irq, void *dev_id);
extern void falcon_irq_ack_a1(struct efx_nic *efx);
#define EFX_IRQ_MOD_RESOLUTION 5
#define EFX_IRQ_MOD_MAX 0x1000
/* Global Resources */
extern int efx_nic_flush_queues(struct efx_nic *efx);
extern void falcon_start_nic_stats(struct efx_nic *efx);