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

commit 427900d27d86b820c559037a984bd403f910860f upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
index ea348ebbbf2e975f628533e02fb510a0e65ac63e..db2e9dd5681ebcee5426b42bdd4248b64469a918 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
@@ -1956,6 +1956,8 @@ 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:
@@ -1968,10 +1970,8 @@ 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;
 }