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sfc: Fix EEH with legacy interrupts.

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PCI legacy interrupts are level-triggered, and we cannot mask them up
on an isolated device.  Instead, disable the IRQ at the controller
until we have recovered.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Alexandre Rames 2013-03-21 16:41:43 +00:00 committed by Ben Hutchings
parent 3717348840
commit b28405b0f2
4 changed files with 18 additions and 1 deletions
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7
drivers/net/ethernet/sfc/efx.c
View file

@ -23,6 +23,7 @@
#include <linux/gfp.h>
#include <linux/cpu_rmap.h>
#include <linux/aer.h>
#include <linux/interrupt.h>
#include "net_driver.h"
#include "efx.h"
#include "nic.h"
@ -1427,6 +1428,10 @@ static void efx_start_interrupts(struct efx_nic *efx, bool may_keep_eventq)
BUG_ON(efx->state == STATE_DISABLED);
if (efx->eeh_disabled_legacy_irq) {
enable_irq(efx->legacy_irq);
efx->eeh_disabled_legacy_irq = false;
}
if (efx->legacy_irq)
efx->legacy_irq_enabled = true;
efx_nic_enable_interrupts(efx);
@ -2365,7 +2370,7 @@ int efx_reset(struct efx_nic *efx, enum reset_type method)
* Returns 0 if the recovery mechanisms are unsuccessful.
* Returns a non-zero value otherwise.
*/
static int efx_try_recovery(struct efx_nic *efx)
int efx_try_recovery(struct efx_nic *efx)
{
#ifdef CONFIG_EEH
/* A PCI error can occur and not be seen by EEH because nothing

1
drivers/net/ethernet/sfc/efx.h
View file

@ -124,6 +124,7 @@ extern const struct ethtool_ops efx_ethtool_ops;
extern int efx_reset(struct efx_nic *efx, enum reset_type method);
extern void efx_reset_down(struct efx_nic *efx, enum reset_type method);
extern int efx_reset_up(struct efx_nic *efx, enum reset_type method, bool ok);
extern int efx_try_recovery(struct efx_nic *efx);
/* Global */
extern void efx_schedule_reset(struct efx_nic *efx, enum reset_type type);

1
drivers/net/ethernet/sfc/net_driver.h
View file

@ -788,6 +788,7 @@ struct efx_nic {
const struct efx_nic_type *type;
int legacy_irq;
bool legacy_irq_enabled;
bool eeh_disabled_legacy_irq;
struct workqueue_struct *workqueue;
char workqueue_name[16];
struct work_struct reset_work;

10
drivers/net/ethernet/sfc/nic.c
View file

@ -1579,6 +1579,16 @@ static irqreturn_t efx_legacy_interrupt(int irq, void *dev_id)
efx_readd(efx, &reg, FR_BZ_INT_ISR0);
queues = EFX_EXTRACT_DWORD(reg, 0, 31);
/* Legacy interrupts are disabled too late by the EEH kernel
* code. Disable them earlier.
* If an EEH error occurred, the read will have returned all ones.
*/
if (EFX_DWORD_IS_ALL_ONES(reg) && efx_try_recovery(efx) &&
!efx->eeh_disabled_legacy_irq) {
disable_irq_nosync(efx->legacy_irq);
efx->eeh_disabled_legacy_irq = true;
}
/* Handle non-event-queue sources */
if (queues & (1U << efx->irq_level)) {
syserr = EFX_OWORD_FIELD(*int_ker, FSF_AZ_NET_IVEC_FATAL_INT);