Patch "net: hns3: fix VF reset fail issue" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    net: hns3: fix VF reset fail issue

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     net-hns3-fix-vf-reset-fail-issue.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit a532a0b3a0ab46fa2f120d8bf4057bf8622dfcda
Author: Jijie Shao <shaojijie@xxxxxxxxxx>
Date:   Fri Nov 10 17:37:12 2023 +0800

    net: hns3: fix VF reset fail issue
    
    [ Upstream commit 65e98bb56fa3ce2edb400930c05238c9b380500e ]
    
    Currently the reset process in hns3 and firmware watchdog init process is
    asynchronous. We think firmware watchdog initialization is completed
    before VF clear the interrupt source. However, firmware initialization
    may not complete early. So VF will receive multiple reset interrupts
    and fail to reset.
    
    So we add delay before VF interrupt source and 5 ms delay
    is enough to avoid second reset interrupt.
    
    Fixes: 427900d27d86 ("net: hns3: fix the timing issue of VF clearing interrupt sources")
    Signed-off-by: Jijie Shao <shaojijie@xxxxxxxxxx>
    Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
index 69913af880a40..880feeac06375 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c
@@ -2487,8 +2487,18 @@ static enum hclgevf_evt_cause hclgevf_check_evt_cause(struct hclgevf_dev *hdev,
 	return HCLGEVF_VECTOR0_EVENT_OTHER;
 }
 
+static void hclgevf_reset_timer(struct timer_list *t)
+{
+	struct hclgevf_dev *hdev = from_timer(hdev, t, reset_timer);
+
+	hclgevf_clear_event_cause(hdev, HCLGEVF_VECTOR0_EVENT_RST);
+	hclgevf_reset_task_schedule(hdev);
+}
+
 static irqreturn_t hclgevf_misc_irq_handle(int irq, void *data)
 {
+#define HCLGEVF_RESET_DELAY	5
+
 	enum hclgevf_evt_cause event_cause;
 	struct hclgevf_dev *hdev = data;
 	u32 clearval;
@@ -2500,7 +2510,8 @@ static irqreturn_t hclgevf_misc_irq_handle(int irq, void *data)
 
 	switch (event_cause) {
 	case HCLGEVF_VECTOR0_EVENT_RST:
-		hclgevf_reset_task_schedule(hdev);
+		mod_timer(&hdev->reset_timer,
+			  jiffies + msecs_to_jiffies(HCLGEVF_RESET_DELAY));
 		break;
 	case HCLGEVF_VECTOR0_EVENT_MBX:
 		hclgevf_mbx_handler(hdev);
@@ -3477,6 +3488,7 @@ static int hclgevf_init_hdev(struct hclgevf_dev *hdev)
 		 HCLGEVF_DRIVER_NAME);
 
 	hclgevf_task_schedule(hdev, round_jiffies_relative(HZ));
+	timer_setup(&hdev->reset_timer, hclgevf_reset_timer, 0);
 
 	return 0;
 
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.h b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.h
index e16068264fa77..5c7538ca36a76 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.h
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.h
@@ -281,6 +281,7 @@ struct hclgevf_dev {
 	enum hnae3_reset_type reset_level;
 	unsigned long reset_pending;
 	enum hnae3_reset_type reset_type;
+	struct timer_list reset_timer;
 
 #define HCLGEVF_RESET_REQUESTED		0
 #define HCLGEVF_RESET_PENDING		1