From: Benjamin Poirier <bpoirier@suse.com>
Date: Fri, 5 Jul 2019 14:46:21 +0900
Subject: qlge: Fix irq masking in INTx mode
Patch-mainline: v5.5-rc1
Git-commit: d7618e38461e6a3f190d88fb941befd51b7c29b0
References: bsc#1106061
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/net/ethernet/qlogic/qlge/qlge_main.c | 11 +++++++++++
1 file changed, 11 insertions(+)
--- a/drivers/net/ethernet/qlogic/qlge/qlge_main.c
+++ b/drivers/net/ethernet/qlogic/qlge/qlge_main.c
@@ -3365,6 +3365,7 @@ 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");
}
@@ -3508,6 +3509,16 @@ static void ql_resolve_queues_to_irqs(st
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;
/*