netdev - [Patch net-next 12/12] net: hns3: clear command queue's registers when unloading VF driver

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Message-ID: <1550629971-23999-13-git-send-email-tanhuazhong@huawei.com>
Date:   Wed, 20 Feb 2019 10:32:51 +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>,
        Peng Li <lipeng321@...wei.com>
Subject: [Patch net-next 12/12] net: hns3: clear command queue's registers when unloading VF driver

According to the hardware's description, the driver should clear
the command queue's registers when uloading VF driver. Otherwise,
these existing value may lead the IMP get into a wrong state.

Fixes: fedd0c15d288 ("net: hns3: Add HNS3 VF IMP(Integrated Management Proc) cmd interface")
Signed-off-by: Huazhong Tan <tanhuazhong@...wei.com>
Signed-off-by: Peng Li <lipeng321@...wei.com>
---
 .../net/ethernet/hisilicon/hns3/hns3vf/hclgevf_cmd.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_cmd.c b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_cmd.c
index 4e78e88..9441b45 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_cmd.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_cmd.c
@@ -362,8 +362,28 @@ int hclgevf_cmd_init(struct hclgevf_dev *hdev)
 	return 0;
 }
 
+static void hclgevf_cmd_uninit_regs(struct hclgevf_hw *hw)
+{
+	hclgevf_write_dev(hw, HCLGEVF_NIC_CSQ_BASEADDR_L_REG, 0);
+	hclgevf_write_dev(hw, HCLGEVF_NIC_CSQ_BASEADDR_H_REG, 0);
+	hclgevf_write_dev(hw, HCLGEVF_NIC_CSQ_DEPTH_REG, 0);
+	hclgevf_write_dev(hw, HCLGEVF_NIC_CSQ_HEAD_REG, 0);
+	hclgevf_write_dev(hw, HCLGEVF_NIC_CSQ_TAIL_REG, 0);
+	hclgevf_write_dev(hw, HCLGEVF_NIC_CRQ_BASEADDR_L_REG, 0);
+	hclgevf_write_dev(hw, HCLGEVF_NIC_CRQ_BASEADDR_H_REG, 0);
+	hclgevf_write_dev(hw, HCLGEVF_NIC_CRQ_DEPTH_REG, 0);
+	hclgevf_write_dev(hw, HCLGEVF_NIC_CRQ_HEAD_REG, 0);
+	hclgevf_write_dev(hw, HCLGEVF_NIC_CRQ_TAIL_REG, 0);
+}
+
 void hclgevf_cmd_uninit(struct hclgevf_dev *hdev)
 {
+	spin_lock_bh(&hdev->hw.cmq.csq.lock);
+	spin_lock(&hdev->hw.cmq.crq.lock);
+	clear_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state);
+	hclgevf_cmd_uninit_regs(&hdev->hw);
+	spin_unlock(&hdev->hw.cmq.crq.lock);
+	spin_unlock_bh(&hdev->hw.cmq.csq.lock);
 	hclgevf_free_cmd_desc(&hdev->hw.cmq.csq);
 	hclgevf_free_cmd_desc(&hdev->hw.cmq.crq);
 }
-- 
2.7.4