net: hns3: fix the timing issue of VF clearing interrupt sources

Currently, the VF does not clear the interrupt source immediately after
receiving the interrupt. As a result, if the second interrupt task is
triggered when processing the first interrupt task, clearing the
interrupt source before exiting will clear the interrupt sources of the
two tasks at the same time. As a result, no interrupt is triggered for
the second task. The VF detects the missed message only when the next
interrupt is generated.

Clearing it immediately after executing check_evt_cause ensures that:
1. Even if two interrupt tasks are triggered at the same time, they can
be processed.
2. If the second task is triggered during the processing of the first
task and the interrupt source is not cleared, the interrupt is reported
after vector0 is enabled.

Fixes: 89427b172e06 ("net: hns3: add reset handling for VF when doing Core/Global/IMP reset")
Signed-off-by: Jiaran Zhang <zhangjiaran@huawei.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
index 82e72702012031ef3d719624fd2b4a11f6effeed..a69e892277b311f8535ae2abb563119b7038864b 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
@@ -2465,6 +2465,8 @@ static irqreturn_t hclgevf_misc_irq_handle(int irq, void *data)
 
        hclgevf_enable_vector(&hdev->misc_vector, false);
        event_cause = hclgevf_check_evt_cause(hdev, &clearval);
+       if (event_cause != HCLGEVF_VECTOR0_EVENT_OTHER)
+               hclgevf_clear_event_cause(hdev, clearval);
 
        switch (event_cause) {
        case HCLGEVF_VECTOR0_EVENT_RST:
@@ -2477,10 +2479,8 @@ static irqreturn_t hclgevf_misc_irq_handle(int irq, void *data)
                break;
        }
 
-       if (event_cause != HCLGEVF_VECTOR0_EVENT_OTHER) {
-               hclgevf_clear_event_cause(hdev, clearval);
+       if (event_cause != HCLGEVF_VECTOR0_EVENT_OTHER)
                hclgevf_enable_vector(&hdev->misc_vector, true);
-       }
 
        return IRQ_HANDLED;
 }