net: hns3: do VF's pci re-initialization while PF doing FLR

While doing PF FLR, VF's PCIe configuration space will be cleared, so
the pci and vector of VF should be re-initialized in the VF's reset
process while PF doing FLR.

Also, this patch fixes some memory not freed problem when pci
re-initialization is done during reset process.

Signed-off-by: Huazhong Tan <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: Huazhong Tan

drivers/net/ethernet/hisilicon/hns3/hns3_enet.c

@@ -3848,20 +3848,30 @@ static int hns3_reset_notify_init_enet(struct hnae3_handle *handle)
 	/* Carrier off reporting is important to ethtool even BEFORE open */
 	netif_carrier_off(netdev);
 
+	ret = hns3_nic_alloc_vector_data(priv);
+	if (ret)
+		return ret;
+
 	hns3_restore_coal(priv);
 
 	ret = hns3_nic_init_vector_data(priv);
 	if (ret)
-		return ret;
+		goto err_dealloc_vector;
 
 	ret = hns3_init_all_ring(priv);
-	if (ret) {
-		hns3_nic_uninit_vector_data(priv);
-		priv->ring_data = NULL;
-	}
+	if (ret)
+		goto err_uninit_vector;
 
 	set_bit(HNS3_NIC_STATE_INITED, &priv->state);
 
+	return ret;
+
+err_uninit_vector:
+	hns3_nic_uninit_vector_data(priv);
+	priv->ring_data = NULL;
+err_dealloc_vector:
+	hns3_nic_dealloc_vector_data(priv);
+
 	return ret;
 }
 
@@ -3886,6 +3896,10 @@ static int hns3_reset_notify_uninit_enet(struct hnae3_handle *handle)
 
 	hns3_store_coal(priv);
 
+	ret = hns3_nic_dealloc_vector_data(priv);
+	if (ret)
+		netdev_err(netdev, "dealloc vector error\n");
+
 	ret = hns3_uninit_all_ring(priv);
 	if (ret)
 		netdev_err(netdev, "uninit ring error\n");

drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c

@@ -1766,6 +1766,7 @@ static int hclgevf_init_msi(struct hclgevf_dev *hdev)
 	hdev->vector_irq = devm_kcalloc(&pdev->dev, hdev->num_msi,
 					sizeof(int), GFP_KERNEL);
 	if (!hdev->vector_irq) {
+		devm_kfree(&pdev->dev, hdev->vector_status);
 		pci_free_irq_vectors(pdev);
 		return -ENOMEM;
 	}
@@ -1777,6 +1778,8 @@ static void hclgevf_uninit_msi(struct hclgevf_dev *hdev)
 {
 	struct pci_dev *pdev = hdev->pdev;
 
+	devm_kfree(&pdev->dev, hdev->vector_status);
+	devm_kfree(&pdev->dev, hdev->vector_irq);
 	pci_free_irq_vectors(pdev);
 }
 
@@ -2001,11 +2004,52 @@ static int hclgevf_query_vf_resource(struct hclgevf_dev *hdev)
 	return 0;
 }
 
+static int hclgevf_pci_reset(struct hclgevf_dev *hdev)
+{
+	struct pci_dev *pdev = hdev->pdev;
+	int ret = 0;
+
+	if (hdev->reset_type == HNAE3_VF_FULL_RESET &&
+	    test_bit(HCLGEVF_STATE_IRQ_INITED, &hdev->state)) {
+		hclgevf_misc_irq_uninit(hdev);
+		hclgevf_uninit_msi(hdev);
+		clear_bit(HCLGEVF_STATE_IRQ_INITED, &hdev->state);
+	}
+
+	if (!test_bit(HCLGEVF_STATE_IRQ_INITED, &hdev->state)) {
+		pci_set_master(pdev);
+		ret = hclgevf_init_msi(hdev);
+		if (ret) {
+			dev_err(&pdev->dev,
+				"failed(%d) to init MSI/MSI-X\n", ret);
+			return ret;
+		}
+
+		ret = hclgevf_misc_irq_init(hdev);
+		if (ret) {
+			hclgevf_uninit_msi(hdev);
+			dev_err(&pdev->dev, "failed(%d) to init Misc IRQ(vector0)\n",
+				ret);
+			return ret;
+		}
+
+		set_bit(HCLGEVF_STATE_IRQ_INITED, &hdev->state);
+	}
+
+	return ret;
+}
+
 static int hclgevf_reset_hdev(struct hclgevf_dev *hdev)
 {
 	struct pci_dev *pdev = hdev->pdev;
 	int ret;
 
+	ret = hclgevf_pci_reset(hdev);
+	if (ret) {
+		dev_err(&pdev->dev, "pci reset failed %d\n", ret);
+		return ret;
+	}
+
 	ret = hclgevf_cmd_init(hdev);
 	if (ret) {
 		dev_err(&pdev->dev, "cmd failed %d\n", ret);
@@ -2076,6 +2120,8 @@ static int hclgevf_init_hdev(struct hclgevf_dev *hdev)
 		goto err_misc_irq_init;
 	}
 
+	set_bit(HCLGEVF_STATE_IRQ_INITED, &hdev->state);
+
 	ret = hclgevf_configure(hdev);
 	if (ret) {
 		dev_err(&pdev->dev, "failed(%d) to fetch configuration\n", ret);
@@ -2123,16 +2169,21 @@ static int hclgevf_init_hdev(struct hclgevf_dev *hdev)
 	hclgevf_cmd_uninit(hdev);
 err_cmd_queue_init:
 	hclgevf_pci_uninit(hdev);
+	clear_bit(HCLGEVF_STATE_IRQ_INITED, &hdev->state);
 	return ret;
 }
 
 static void hclgevf_uninit_hdev(struct hclgevf_dev *hdev)
 {
 	hclgevf_state_uninit(hdev);
-	hclgevf_misc_irq_uninit(hdev);
+
+	if (test_bit(HCLGEVF_STATE_IRQ_INITED, &hdev->state)) {
+		hclgevf_misc_irq_uninit(hdev);
+		hclgevf_uninit_msi(hdev);
+		hclgevf_pci_uninit(hdev);
+	}
+
 	hclgevf_cmd_uninit(hdev);
-	hclgevf_uninit_msi(hdev);
-	hclgevf_pci_uninit(hdev);
 }
 
 static int hclgevf_init_ae_dev(struct hnae3_ae_dev *ae_dev)

drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.h

@@ -73,6 +73,7 @@ enum hclgevf_states {
 	/* device states */
 	HCLGEVF_STATE_DOWN,
 	HCLGEVF_STATE_DISABLED,
+	HCLGEVF_STATE_IRQ_INITED,
 	/* task states */
 	HCLGEVF_STATE_SERVICE_SCHED,
 	HCLGEVF_STATE_RST_SERVICE_SCHED,