Merge branch 'Misc-Bug-Fixes-and-clean-ups-for-HNS3-Driver'

Salil Mehta says:

====================
Misc. Bug Fixes and clean-ups for HNS3 Driver

This patch-set mainly introduces various bug fixes, cleanups and one
very small enhancement to existing HN3 driver code.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns3/hnae3.c

@@ -50,13 +50,22 @@ static int hnae3_match_n_instantiate(struct hnae3_client *client,
 	/* now, (un-)instantiate client by calling lower layer */
 	if (is_reg) {
 		ret = ae_dev->ops->init_client_instance(client, ae_dev);
-		if (ret)
+		if (ret) {
 			dev_err(&ae_dev->pdev->dev,
 				"fail to instantiate client\n");
-		return ret;
+			return ret;
+		}
+
+		hnae_set_bit(ae_dev->flag, HNAE3_CLIENT_INITED_B, 1);
+		return 0;
+	}
+
+	if (hnae_get_bit(ae_dev->flag, HNAE3_CLIENT_INITED_B)) {
+		ae_dev->ops->uninit_client_instance(client, ae_dev);
+
+		hnae_set_bit(ae_dev->flag, HNAE3_CLIENT_INITED_B, 0);
 	}
 
-	ae_dev->ops->uninit_client_instance(client, ae_dev);
 	return 0;
 }
 
@@ -89,7 +98,7 @@ int hnae3_register_client(struct hnae3_client *client)
 exit:
 	mutex_unlock(&hnae3_common_lock);
 
-	return ret;
+	return 0;
 }
 EXPORT_SYMBOL(hnae3_register_client);
 
@@ -112,7 +121,7 @@ EXPORT_SYMBOL(hnae3_unregister_client);
  * @ae_algo: AE algorithm
  * NOTE: the duplicated name will not be checked
  */
-int hnae3_register_ae_algo(struct hnae3_ae_algo *ae_algo)
+void hnae3_register_ae_algo(struct hnae3_ae_algo *ae_algo)
 {
 	const struct pci_device_id *id;
 	struct hnae3_ae_dev *ae_dev;
@@ -151,8 +160,6 @@ int hnae3_register_ae_algo(struct hnae3_ae_algo *ae_algo)
 	}
 
 	mutex_unlock(&hnae3_common_lock);
-
-	return ret;
 }
 EXPORT_SYMBOL(hnae3_register_ae_algo);
 
@@ -168,6 +175,9 @@ void hnae3_unregister_ae_algo(struct hnae3_ae_algo *ae_algo)
 	mutex_lock(&hnae3_common_lock);
 	/* Check if there are matched ae_dev */
 	list_for_each_entry(ae_dev, &hnae3_ae_dev_list, node) {
+		if (!hnae_get_bit(ae_dev->flag, HNAE3_DEV_INITED_B))
+			continue;
+
 		id = pci_match_id(ae_algo->pdev_id_table, ae_dev->pdev);
 		if (!id)
 			continue;
@@ -191,22 +201,14 @@ EXPORT_SYMBOL(hnae3_unregister_ae_algo);
  * @ae_dev: the AE device
  * NOTE: the duplicated name will not be checked
  */
-int hnae3_register_ae_dev(struct hnae3_ae_dev *ae_dev)
+void hnae3_register_ae_dev(struct hnae3_ae_dev *ae_dev)
 {
 	const struct pci_device_id *id;
 	struct hnae3_ae_algo *ae_algo;
 	struct hnae3_client *client;
-	int ret = 0, lock_acquired;
+	int ret = 0;
 
-	/* we can get deadlocked if SRIOV is being enabled in context to probe
-	 * and probe gets called again in same context. This can happen when
-	 * pci_enable_sriov() is called to create VFs from PF probes context.
-	 * Therefore, for simplicity uniformly defering further probing in all
-	 * cases where we detect contention.
-	 */
-	lock_acquired = mutex_trylock(&hnae3_common_lock);
-	if (!lock_acquired)
-		return -EPROBE_DEFER;
+	mutex_lock(&hnae3_common_lock);
 
 	list_add_tail(&ae_dev->node, &hnae3_ae_dev_list);
 
@@ -220,7 +222,6 @@ int hnae3_register_ae_dev(struct hnae3_ae_dev *ae_dev)
 
 		if (!ae_dev->ops) {
 			dev_err(&ae_dev->pdev->dev, "ae_dev ops are null\n");
-			ret = -EOPNOTSUPP;
 			goto out_err;
 		}
 
@@ -247,8 +248,6 @@ int hnae3_register_ae_dev(struct hnae3_ae_dev *ae_dev)
 
 out_err:
 	mutex_unlock(&hnae3_common_lock);
-
-	return ret;
 }
 EXPORT_SYMBOL(hnae3_register_ae_dev);
 
@@ -264,6 +263,9 @@ void hnae3_unregister_ae_dev(struct hnae3_ae_dev *ae_dev)
 	mutex_lock(&hnae3_common_lock);
 	/* Check if there are matched ae_algo */
 	list_for_each_entry(ae_algo, &hnae3_ae_algo_list, node) {
+		if (!hnae_get_bit(ae_dev->flag, HNAE3_DEV_INITED_B))
+			continue;
+
 		id = pci_match_id(ae_algo->pdev_id_table, ae_dev->pdev);
 		if (!id)
 			continue;

drivers/net/ethernet/hisilicon/hns3/hnae3.h

@@ -52,6 +52,7 @@
 #define HNAE3_DEV_INITED_B			0x0
 #define HNAE3_DEV_SUPPORT_ROCE_B		0x1
 #define HNAE3_DEV_SUPPORT_DCB_B			0x2
+#define HNAE3_CLIENT_INITED_B			0x3
 
 #define HNAE3_DEV_SUPPORT_ROCE_DCB_BITS (BIT(HNAE3_DEV_SUPPORT_DCB_B) |\
 		BIT(HNAE3_DEV_SUPPORT_ROCE_B))
@@ -514,11 +515,11 @@ struct hnae3_handle {
 #define hnae_get_bit(origin, shift) \
 	hnae_get_field((origin), (0x1 << (shift)), (shift))
 
-int hnae3_register_ae_dev(struct hnae3_ae_dev *ae_dev);
+void hnae3_register_ae_dev(struct hnae3_ae_dev *ae_dev);
 void hnae3_unregister_ae_dev(struct hnae3_ae_dev *ae_dev);
 
 void hnae3_unregister_ae_algo(struct hnae3_ae_algo *ae_algo);
-int hnae3_register_ae_algo(struct hnae3_ae_algo *ae_algo);
+void hnae3_register_ae_algo(struct hnae3_ae_algo *ae_algo);
 
 void hnae3_unregister_client(struct hnae3_client *client);
 int hnae3_register_client(struct hnae3_client *client);

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

@@ -1487,6 +1487,45 @@ static const struct net_device_ops hns3_nic_netdev_ops = {
 	.ndo_set_vf_vlan	= hns3_ndo_set_vf_vlan,
 };
 
+static bool hns3_is_phys_func(struct pci_dev *pdev)
+{
+	u32 dev_id = pdev->device;
+
+	switch (dev_id) {
+	case HNAE3_DEV_ID_GE:
+	case HNAE3_DEV_ID_25GE:
+	case HNAE3_DEV_ID_25GE_RDMA:
+	case HNAE3_DEV_ID_25GE_RDMA_MACSEC:
+	case HNAE3_DEV_ID_50GE_RDMA:
+	case HNAE3_DEV_ID_50GE_RDMA_MACSEC:
+	case HNAE3_DEV_ID_100G_RDMA_MACSEC:
+		return true;
+	case HNAE3_DEV_ID_100G_VF:
+	case HNAE3_DEV_ID_100G_RDMA_DCB_PFC_VF:
+		return false;
+	default:
+		dev_warn(&pdev->dev, "un-recognized pci device-id %d",
+			 dev_id);
+	}
+
+	return false;
+}
+
+static void hns3_disable_sriov(struct pci_dev *pdev)
+{
+	/* If our VFs are assigned we cannot shut down SR-IOV
+	 * without causing issues, so just leave the hardware
+	 * available but disabled
+	 */
+	if (pci_vfs_assigned(pdev)) {
+		dev_warn(&pdev->dev,
+			 "disabling driver while VFs are assigned\n");
+		return;
+	}
+
+	pci_disable_sriov(pdev);
+}
+
 /* hns3_probe - Device initialization routine
  * @pdev: PCI device information struct
  * @ent: entry in hns3_pci_tbl
@@ -1514,7 +1553,9 @@ static int hns3_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	ae_dev->dev_type = HNAE3_DEV_KNIC;
 	pci_set_drvdata(pdev, ae_dev);
 
-	return hnae3_register_ae_dev(ae_dev);
+	hnae3_register_ae_dev(ae_dev);
+
+	return 0;
 }
 
 /* hns3_remove - Device removal routine
@@ -1524,14 +1565,49 @@ static void hns3_remove(struct pci_dev *pdev)
 {
 	struct hnae3_ae_dev *ae_dev = pci_get_drvdata(pdev);
 
+	if (hns3_is_phys_func(pdev) && IS_ENABLED(CONFIG_PCI_IOV))
+		hns3_disable_sriov(pdev);
+
 	hnae3_unregister_ae_dev(ae_dev);
 }
 
+/**
+ * hns3_pci_sriov_configure
+ * @pdev: pointer to a pci_dev structure
+ * @num_vfs: number of VFs to allocate
+ *
+ * Enable or change the number of VFs. Called when the user updates the number
+ * of VFs in sysfs.
+ **/
+int hns3_pci_sriov_configure(struct pci_dev *pdev, int num_vfs)
+{
+	int ret;
+
+	if (!(hns3_is_phys_func(pdev) && IS_ENABLED(CONFIG_PCI_IOV))) {
+		dev_warn(&pdev->dev, "Can not config SRIOV\n");
+		return -EINVAL;
+	}
+
+	if (num_vfs) {
+		ret = pci_enable_sriov(pdev, num_vfs);
+		if (ret)
+			dev_err(&pdev->dev, "SRIOV enable failed %d\n", ret);
+	} else if (!pci_vfs_assigned(pdev)) {
+		pci_disable_sriov(pdev);
+	} else {
+		dev_warn(&pdev->dev,
+			 "Unable to free VFs because some are assigned to VMs.\n");
+	}
+
+	return 0;
+}
+
 static struct pci_driver hns3_driver = {
 	.name     = hns3_driver_name,
 	.id_table = hns3_pci_tbl,
 	.probe    = hns3_probe,
 	.remove   = hns3_remove,
+	.sriov_configure = hns3_pci_sriov_configure,
 };
 
 /* set default feature to hns3 */

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c

@@ -1473,21 +1473,8 @@ static int hclge_alloc_vport(struct hclge_dev *hdev)
 	hdev->vport = vport;
 	hdev->num_alloc_vport = num_vport;
 
-#ifdef CONFIG_PCI_IOV
-	/* Enable SRIOV */
-	if (hdev->num_req_vfs) {
-		dev_info(&pdev->dev, "active VFs(%d) found, enabling SRIOV\n",
-			 hdev->num_req_vfs);
-		ret = pci_enable_sriov(hdev->pdev, hdev->num_req_vfs);
-		if (ret) {
-			hdev->num_alloc_vfs = 0;
-			dev_err(&pdev->dev, "SRIOV enable failed %d\n",
-				ret);
-			return ret;
-		}
-	}
-	hdev->num_alloc_vfs = hdev->num_req_vfs;
-#endif
+	if (IS_ENABLED(CONFIG_PCI_IOV))
+		hdev->num_alloc_vfs = hdev->num_req_vfs;
 
 	for (i = 0; i < num_vport; i++) {
 		vport->back = hdev;
@@ -2946,21 +2933,6 @@ static void hclge_service_task(struct work_struct *work)
 	hclge_service_complete(hdev);
 }
 
-static void hclge_disable_sriov(struct hclge_dev *hdev)
-{
-	/* If our VFs are assigned we cannot shut down SR-IOV
-	 * without causing issues, so just leave the hardware
-	 * available but disabled
-	 */
-	if (pci_vfs_assigned(hdev->pdev)) {
-		dev_warn(&hdev->pdev->dev,
-			 "disabling driver while VFs are assigned\n");
-		return;
-	}
-
-	pci_disable_sriov(hdev->pdev);
-}
-
 struct hclge_vport *hclge_get_vport(struct hnae3_handle *handle)
 {
 	/* VF handle has no client */
@@ -3784,6 +3756,7 @@ static int hclge_ae_start(struct hnae3_handle *handle)
 	hclge_cfg_mac_mode(hdev, true);
 	clear_bit(HCLGE_STATE_DOWN, &hdev->state);
 	mod_timer(&hdev->service_timer, jiffies + HZ);
+	hdev->hw.mac.link = 0;
 
 	/* reset tqp stats */
 	hclge_reset_tqp_stats(handle);
@@ -3820,7 +3793,6 @@ static void hclge_ae_stop(struct hnae3_handle *handle)
 
 	/* reset tqp stats */
 	hclge_reset_tqp_stats(handle);
-	hclge_update_link_status(hdev);
 }
 
 static int hclge_get_mac_vlan_cmd_status(struct hclge_vport *vport,
@@ -5407,7 +5379,7 @@ static int hclge_pci_init(struct hclge_dev *hdev)
 	ret = pci_enable_device(pdev);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to enable PCI device\n");
-		goto err_no_drvdata;
+		return ret;
 	}
 
 	ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
@@ -5445,8 +5417,6 @@ static int hclge_pci_init(struct hclge_dev *hdev)
 	pci_release_regions(pdev);
 err_disable_device:
 	pci_disable_device(pdev);
-err_no_drvdata:
-	pci_set_drvdata(pdev, NULL);
 
 	return ret;
 }
@@ -5455,6 +5425,7 @@ static void hclge_pci_uninit(struct hclge_dev *hdev)
 {
 	struct pci_dev *pdev = hdev->pdev;
 
+	pcim_iounmap(pdev, hdev->hw.io_base);
 	pci_free_irq_vectors(pdev);
 	pci_clear_master(pdev);
 	pci_release_mem_regions(pdev);
@@ -5540,15 +5511,15 @@ static int hclge_init_ae_dev(struct hnae3_ae_dev *ae_dev)
 	ret = hclge_map_tqp(hdev);
 	if (ret) {
 		dev_err(&pdev->dev, "Map tqp error, ret = %d.\n", ret);
-		goto err_sriov_disable;
+		goto err_msi_irq_uninit;
 	}
 
 	if (hdev->hw.mac.media_type == HNAE3_MEDIA_TYPE_COPPER) {
 		ret = hclge_mac_mdio_config(hdev);
 		if (ret) {
 			dev_err(&hdev->pdev->dev,
 				"mdio config fail ret=%d\n", ret);
-			goto err_sriov_disable;
+			goto err_msi_irq_uninit;
 		}
 	}
 
@@ -5612,20 +5583,17 @@ static int hclge_init_ae_dev(struct hnae3_ae_dev *ae_dev)
 err_mdiobus_unreg:
 	if (hdev->hw.mac.phydev)
 		mdiobus_unregister(hdev->hw.mac.mdio_bus);
-err_sriov_disable:
-	if (IS_ENABLED(CONFIG_PCI_IOV))
-		hclge_disable_sriov(hdev);
 err_msi_irq_uninit:
 	hclge_misc_irq_uninit(hdev);
 err_msi_uninit:
 	pci_free_irq_vectors(pdev);
 err_cmd_uninit:
 	hclge_destroy_cmd_queue(&hdev->hw);
 err_pci_uninit:
+	pcim_iounmap(pdev, hdev->hw.io_base);
 	pci_clear_master(pdev);
 	pci_release_regions(pdev);
 	pci_disable_device(pdev);
-	pci_set_drvdata(pdev, NULL);
 out:
 	return ret;
 }
@@ -5717,9 +5685,6 @@ static void hclge_uninit_ae_dev(struct hnae3_ae_dev *ae_dev)
 
 	set_bit(HCLGE_STATE_DOWN, &hdev->state);
 
-	if (IS_ENABLED(CONFIG_PCI_IOV))
-		hclge_disable_sriov(hdev);
-
 	if (hdev->service_timer.function)
 		del_timer_sync(&hdev->service_timer);
 	if (hdev->service_task.func)
@@ -6287,7 +6252,9 @@ static int hclge_init(void)
 {
 	pr_info("%s is initializing\n", HCLGE_NAME);
 
-	return hnae3_register_ae_algo(&ae_algo);
+	hnae3_register_ae_algo(&ae_algo);
+
+	return 0;
 }
 
 static void hclge_exit(void)