netdev - [PATCH net-next 07/12] net: hns3: do not request reset when hardware resetting

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Date:   Sat, 6 Apr 2019 15:43:31 +0800
From:   Huazhong Tan <tanhuazhong@...wei.com>
To:     <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <salil.mehta@...wei.com>, <yisen.zhuang@...wei.com>,
        <linuxarm@...wei.com>, Huazhong Tan <tanhuazhong@...wei.com>
Subject: [PATCH net-next 07/12] net: hns3: do not request reset when hardware resetting

When hardware reset does not finish, the driver should not
request a new reset, otherwise the ongoing hardware reset
will get problem.

Signed-off-by: Huazhong Tan <tanhuazhong@...wei.com>
---
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
index 6e8fa2e..1c93da2 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
@@ -32,6 +32,7 @@
 static int hclge_set_mac_mtu(struct hclge_dev *hdev, int new_mps);
 static int hclge_init_vlan_config(struct hclge_dev *hdev);
 static int hclge_reset_ae_dev(struct hnae3_ae_dev *ae_dev);
+static bool hclge_get_hw_reset_stat(struct hnae3_handle *handle);
 static int hclge_set_umv_space(struct hclge_dev *hdev, u16 space_size,
 			       u16 *allocated_size, bool is_alloc);
 
@@ -2714,9 +2715,18 @@ int hclge_func_reset_cmd(struct hclge_dev *hdev, int func_id)
 
 static void hclge_do_reset(struct hclge_dev *hdev)
 {
+	struct hnae3_handle *handle = &hdev->vport[0].nic;
 	struct pci_dev *pdev = hdev->pdev;
 	u32 val;
 
+	if (hclge_get_hw_reset_stat(handle)) {
+		dev_info(&pdev->dev, "Hardware reset not finish\n");
+		dev_info(&pdev->dev, "func_rst_reg:0x%x, global_rst_reg:0x%x\n",
+			 hclge_read_dev(&hdev->hw, HCLGE_FUN_RST_ING),
+			 hclge_read_dev(&hdev->hw, HCLGE_GLOBAL_RESET_REG));
+		return;
+	}
+
 	switch (hdev->reset_type) {
 	case HNAE3_GLOBAL_RESET:
 		val = hclge_read_dev(&hdev->hw, HCLGE_GLOBAL_RESET_REG);
-- 
2.7.4