[Patch net-next 11/12] net: hns3: uninitialize command queue while unloading PF driver

[Huazhong Tan]

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

Also this patch adds hclge_cmd_uninit() to do the command queue
uninitialization which includes clearing registers and freeing
memory.

Fixes: 68c0a5c70614 ("net: hns3: Add HNS3 IMP(Integrated Mgmt Proc) Cmd Interface Support")
Signed-off-by: Huazhong Tan <tanhuazhong@xxxxxxxxxx>
Signed-off-by: Peng Li <lipeng321@xxxxxxxxxx>
---
 .../net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c | 26 ++++++++++++++++++++++
 .../net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.h |  2 +-
 .../ethernet/hisilicon/hns3/hns3pf/hclge_main.c    |  4 ++--
 3 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c
index 1dddfcb..3a093a9 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c
@@ -390,6 +390,20 @@ int hclge_cmd_init(struct hclge_dev *hdev)
 	return 0;
 }
 
+static void hclge_cmd_uninit_regs(struct hclge_hw *hw)
+{
+	hclge_write_dev(hw, HCLGE_NIC_CSQ_BASEADDR_L_REG, 0);
+	hclge_write_dev(hw, HCLGE_NIC_CSQ_BASEADDR_H_REG, 0);
+	hclge_write_dev(hw, HCLGE_NIC_CSQ_DEPTH_REG, 0);
+	hclge_write_dev(hw, HCLGE_NIC_CSQ_HEAD_REG, 0);
+	hclge_write_dev(hw, HCLGE_NIC_CSQ_TAIL_REG, 0);
+	hclge_write_dev(hw, HCLGE_NIC_CRQ_BASEADDR_L_REG, 0);
+	hclge_write_dev(hw, HCLGE_NIC_CRQ_BASEADDR_H_REG, 0);
+	hclge_write_dev(hw, HCLGE_NIC_CRQ_DEPTH_REG, 0);
+	hclge_write_dev(hw, HCLGE_NIC_CRQ_HEAD_REG, 0);
+	hclge_write_dev(hw, HCLGE_NIC_CRQ_TAIL_REG, 0);
+}
+
 static void hclge_destroy_queue(struct hclge_cmq_ring *ring)
 {
 	spin_lock(&ring->lock);
@@ -402,3 +416,15 @@ void hclge_destroy_cmd_queue(struct hclge_hw *hw)
 	hclge_destroy_queue(&hw->cmq.csq);
 	hclge_destroy_queue(&hw->cmq.crq);
 }
+
+void hclge_cmd_uninit(struct hclge_dev *hdev)
+{
+	spin_lock_bh(&hdev->hw.cmq.csq.lock);
+	spin_lock(&hdev->hw.cmq.crq.lock);
+	set_bit(HCLGE_STATE_CMD_DISABLE, &hdev->state);
+	hclge_cmd_uninit_regs(&hdev->hw);
+	spin_unlock(&hdev->hw.cmq.crq.lock);
+	spin_unlock_bh(&hdev->hw.cmq.csq.lock);
+
+	hclge_destroy_cmd_queue(&hdev->hw);
+}
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.h b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.h
index ac2cd21..bad21c89 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.h
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.h
@@ -975,6 +975,6 @@ enum hclge_cmd_status hclge_cmd_mdio_write(struct hclge_hw *hw,
 enum hclge_cmd_status hclge_cmd_mdio_read(struct hclge_hw *hw,
 					  struct hclge_desc *desc);
 
-void hclge_destroy_cmd_queue(struct hclge_hw *hw);
+void hclge_cmd_uninit(struct hclge_dev *hdev);
 int hclge_cmd_queue_init(struct hclge_dev *hdev);
 #endif
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
index 4a59646..5c8f2e4 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
@@ -7669,7 +7669,7 @@ static int hclge_init_ae_dev(struct hnae3_ae_dev *ae_dev)
 err_msi_uninit:
 	pci_free_irq_vectors(pdev);
 err_cmd_uninit:
-	hclge_destroy_cmd_queue(&hdev->hw);
+	hclge_cmd_uninit(hdev);
 err_pci_uninit:
 	pcim_iounmap(pdev, hdev->hw.io_base);
 	pci_clear_master(pdev);
@@ -7796,7 +7796,7 @@ static void hclge_uninit_ae_dev(struct hnae3_ae_dev *ae_dev)
 	synchronize_irq(hdev->misc_vector.vector_irq);
 
 	hclge_hw_error_set_state(hdev, false);
-	hclge_destroy_cmd_queue(&hdev->hw);
+	hclge_cmd_uninit(hdev);
 	hclge_misc_irq_uninit(hdev);
 	hclge_pci_uninit(hdev);
 	mutex_destroy(&hdev->vport_lock);
-- 
2.7.4