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| author | Steve Hodgson <shodgson@solarflare.com> | 2010-04-28 09:28:27 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-04-28 12:44:35 -0700 |
| commit | 41b7e4c3268d9d2056b9c94cceb386649f7b185b (patch) | |
| tree | 706d46fdd10943ba86d4eda2ff210bc506997144 /drivers/net/sfc | |
| parent | b7b40eeb0f76e73503a7e5a98d1353c2e42d9a18 (diff) | |
| download | linux-41b7e4c3268d9d2056b9c94cceb386649f7b185b.tar.gz linux-41b7e4c3268d9d2056b9c94cceb386649f7b185b.tar.bz2 linux-41b7e4c3268d9d2056b9c94cceb386649f7b185b.zip | |
sfc: Extend the legacy interrupt workarounds
Siena has two problems with legacy interrupts:
1. There is no synchronisation between the ISR read completion,
and the interrupt deassert message.
2. A downstream read at the "wrong" moment can return 0, and
suppress generating the next interrupt.
Falcon should suffer from both of these, and it appears it does.
Enable EFX_WORKAROUND_15783 on Falcon as well.
Also, when we see queues == 0, ensure we always schedule or rearm
every event queue.
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/sfc')
| -rw-r--r-- | drivers/net/sfc/nic.c | 23 | ||||
| -rw-r--r-- | drivers/net/sfc/workarounds.h | 2 |
2 files changed, 10 insertions, 15 deletions
diff --git a/drivers/net/sfc/nic.c b/drivers/net/sfc/nic.c index 23738f80835b..b61674cb0c19 100644 --- a/drivers/net/sfc/nic.c +++ b/drivers/net/sfc/nic.c @@ -1356,33 +1356,28 @@ static irqreturn_t efx_legacy_interrupt(int irq, void *dev_id) } result = IRQ_HANDLED; - } else if (EFX_WORKAROUND_15783(efx) && - efx->irq_zero_count++ == 0) { + } else if (EFX_WORKAROUND_15783(efx)) { efx_qword_t *event; - /* Ensure we rearm all event queues */ + /* We can't return IRQ_HANDLED more than once on seeing ISR=0 + * because this might be a shared interrupt. */ + if (efx->irq_zero_count++ == 0) + result = IRQ_HANDLED; + + /* Ensure we schedule or rearm all event queues */ efx_for_each_channel(channel, efx) { event = efx_event(channel, channel->eventq_read_ptr); if (efx_event_present(event)) efx_schedule_channel(channel); + else + efx_nic_eventq_read_ack(channel); } - - result = IRQ_HANDLED; } if (result == IRQ_HANDLED) { efx->last_irq_cpu = raw_smp_processor_id(); EFX_TRACE(efx, "IRQ %d on CPU %d status " EFX_DWORD_FMT "\n", irq, raw_smp_processor_id(), EFX_DWORD_VAL(reg)); - } else if (EFX_WORKAROUND_15783(efx)) { - /* We can't return IRQ_HANDLED more than once on seeing ISR0=0 - * because this might be a shared interrupt, but we do need to - * check the channel every time and preemptively rearm it if - * it's idle. */ - efx_for_each_channel(channel, efx) { - if (!channel->work_pending) - efx_nic_eventq_read_ack(channel); - } } return result; diff --git a/drivers/net/sfc/workarounds.h b/drivers/net/sfc/workarounds.h index acd9c734e483..518f7fc91473 100644 --- a/drivers/net/sfc/workarounds.h +++ b/drivers/net/sfc/workarounds.h @@ -37,7 +37,7 @@ /* Truncated IPv4 packets can confuse the TX packet parser */ #define EFX_WORKAROUND_15592 EFX_WORKAROUND_FALCON_AB /* Legacy ISR read can return zero once */ -#define EFX_WORKAROUND_15783 EFX_WORKAROUND_SIENA +#define EFX_WORKAROUND_15783 EFX_WORKAROUND_ALWAYS /* Legacy interrupt storm when interrupt fifo fills */ #define EFX_WORKAROUND_17213 EFX_WORKAROUND_SIENA |