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staging: qlge: Fix irq masking in INTx mode 

Tracing the driver operation reveals that the INTR_EN_EN bit (per-queue
interrupt control) does not immediately prevent rx completion interrupts
when the device is operating in INTx mode. This leads to interrupts being
raised while napi is scheduled/running. Those interrupts are ignored by
qlge_isr() and falsely reported as IRQ_NONE thanks to the irq_cnt scheme.
This in turn can cause frames to loiter in the receive queue until a later
frame leads to another rx interrupt that will schedule napi.

Use the INTR_EN_EI bit (master interrupt control) instead.

Signed-off-by: Benjamin Poirier <bpoirier@suse.com>
Link: https://lore.kernel.org/r/20190927101210.23856-2-bpoirier@suse.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Benjamin Poirier 2019-09-27 19:11:55 +09:00 committed by Greg Kroah-Hartman
parent 40115bbc40
commit d7618e3846
1 changed files with 11 additions and 0 deletions
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11
drivers/staging/qlge/qlge_main.c
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@ -3366,6 +3366,7 @@ msi:
}
}
qlge_irq_type = LEG_IRQ;
set_bit(QL_LEGACY_ENABLED, &qdev->flags);
netif_printk(qdev, ifup, KERN_DEBUG, qdev->ndev,
"Running with legacy interrupts.\n");
}
@ -3509,6 +3510,16 @@ static void ql_resolve_queues_to_irqs(struct ql_adapter *qdev)
intr_context->intr_dis_mask =
INTR_EN_TYPE_MASK | INTR_EN_INTR_MASK |
INTR_EN_TYPE_DISABLE;
if (test_bit(QL_LEGACY_ENABLED, &qdev->flags)) {
/* Experience shows that when using INTx interrupts,
* the device does not always auto-mask INTR_EN_EN.
* Moreover, masking INTR_EN_EN manually does not
* immediately prevent interrupt generation.
*/
intr_context->intr_en_mask |= INTR_EN_EI << 16 |
INTR_EN_EI;
intr_context->intr_dis_mask |= INTR_EN_EI << 16;
}
intr_context->intr_read_mask =
INTR_EN_TYPE_MASK | INTR_EN_INTR_MASK | INTR_EN_TYPE_READ;
/*