net: hns3: Prevent to request reset frequently

Netdevice reset should not be requested frequently, a new one
must wait a moment since there may be some work not completed.

Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
index 3886290..a1886a3 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
@@ -2819,7 +2819,10 @@ static void hclge_clear_reset_cause(struct hclge_dev *hdev)
 
 static void hclge_reset(struct hclge_dev *hdev)
 {
+       struct hnae3_handle *handle;
+
        /* perform reset of the stack & ae device for a client */
+       handle = &hdev->vport[0].nic;
        rtnl_lock();
        hclge_notify_client(hdev, HNAE3_DOWN_CLIENT);
 
@@ -2836,6 +2839,7 @@ static void hclge_reset(struct hclge_dev *hdev)
        }
 
        hclge_notify_client(hdev, HNAE3_UP_CLIENT);
+       handle->last_reset_time = jiffies;
        rtnl_unlock();
 }
 
@@ -2849,8 +2853,13 @@ static void hclge_reset_event(struct hnae3_handle *handle)
         * know this if last reset request did not occur very recently (watchdog
         * timer = 5*HZ, let us check after sufficiently large time, say 4*5*Hz)
         * In case of new request we reset the "reset level" to PF reset.
+        * And if it is a repeat reset request of the most recent one then we
+        * want to make sure we throttle the reset request. Therefore, we will
+        * not allow it again before 3*HZ times.
         */
-       if (time_after(jiffies, (handle->last_reset_time + 4 * 5 * HZ)))
+       if (time_before(jiffies, (handle->last_reset_time + 3 * HZ)))
+               return;
+       else if (time_after(jiffies, (handle->last_reset_time + 4 * 5 * HZ)))
                handle->reset_level = HNAE3_FUNC_RESET;
 
        dev_info(&hdev->pdev->dev, "received reset event , reset type is %d",
@@ -2862,8 +2871,6 @@ static void hclge_reset_event(struct hnae3_handle *handle)
 
        if (handle->reset_level < HNAE3_GLOBAL_RESET)
                handle->reset_level++;
-
-       handle->last_reset_time = jiffies;
 }
 
 static void hclge_reset_subtask(struct hclge_dev *hdev)