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Subject[PATCH v2 01/17] staging: qlge: Fix irq masking in INTx mode
Date
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>
---
drivers/staging/qlge/qlge_main.c | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/drivers/staging/qlge/qlge_main.c b/drivers/staging/qlge/qlge_main.c
index 6cae33072496..d7b64d360ea8 100644
--- a/drivers/staging/qlge/qlge_main.c
+++ b/drivers/staging/qlge/qlge_main.c
@@ -3366,6 +3366,7 @@ static void ql_enable_msix(struct ql_adapter *qdev)
}
}
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;
/*
--
2.23.0
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