net: hns3: Unified HNS3 {VF|PF} Ethernet Driver for hip08 SoC

Most of the NAPI handling interface, skb buffer management,
management of the RX/TX descriptors, ethool interface etc.
has quite a bit of code which is common to VF and PF driver.

This patch makes the exisitng PF's HNS3 ENET driver as the
common ENET driver for both Virtual & Physical Function. This
will help in reduction of redundancy and better management of
code.

Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: lipeng <lipeng321@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns3/Makefile

@@ -7,3 +7,8 @@ obj-$(CONFIG_HNS3) += hns3pf/
 obj-$(CONFIG_HNS3) += hns3vf/
 
 obj-$(CONFIG_HNS3) += hnae3.o
+
+obj-$(CONFIG_HNS3_ENET) += hns3.o
+hns3-objs = hns3_enet.o hns3_ethtool.o
+
+hns3-$(CONFIG_HNS3_DCB) += hns3_dcbnl.o

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

@@ -196,9 +196,18 @@ int 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;
+	int ret = 0, lock_acquired;
+
+	/* 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);
 
 	/* Check if there are matched ae_algo */
@@ -211,6 +220,7 @@ 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;
 		}
 

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

@@ -452,9 +452,10 @@ struct hnae3_unic_private_info {
 	struct hnae3_queue **tqp;  /* array base of all TQPs of this instance */
 };
 
-#define HNAE3_SUPPORT_MAC_LOOPBACK    1
-#define HNAE3_SUPPORT_PHY_LOOPBACK    2
-#define HNAE3_SUPPORT_SERDES_LOOPBACK 4
+#define HNAE3_SUPPORT_MAC_LOOPBACK    BIT(0)
+#define HNAE3_SUPPORT_PHY_LOOPBACK    BIT(1)
+#define HNAE3_SUPPORT_SERDES_LOOPBACK BIT(2)
+#define HNAE3_SUPPORT_VF	      BIT(3)
 
 struct hnae3_handle {
 	struct hnae3_client *client;

drivers/net/ethernet/hisilicon/hns3/hns3_dcbnl.c

@@ -93,7 +93,7 @@ void hns3_dcbnl_setup(struct hnae3_handle *handle)
 {
 	struct net_device *dev = handle->kinfo.netdev;
 
-	if (!handle->kinfo.dcb_ops)
+	if ((!handle->kinfo.dcb_ops) || (handle->flags & HNAE3_SUPPORT_VF))
 		return;
 
 	dev->dcbnl_ops = &hns3_dcbnl_ops;

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

@@ -52,6 +52,8 @@ static const struct pci_device_id hns3_pci_tbl[] = {
 	 HNAE3_DEV_SUPPORT_ROCE_DCB_BITS},
 	{PCI_VDEVICE(HUAWEI, HNAE3_DEV_ID_100G_RDMA_MACSEC),
 	 HNAE3_DEV_SUPPORT_ROCE_DCB_BITS},
+	{PCI_VDEVICE(HUAWEI, HNAE3_DEV_ID_100G_VF), 0},
+	{PCI_VDEVICE(HUAWEI, HNAE3_DEV_ID_100G_RDMA_DCB_PFC_VF), 0},
 	/* required last entry */
 	{0, }
 };

drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c

@@ -849,6 +849,21 @@ static int hns3_nway_reset(struct net_device *netdev)
 	return genphy_restart_aneg(phy);
 }
 
+static const struct ethtool_ops hns3vf_ethtool_ops = {
+	.get_drvinfo = hns3_get_drvinfo,
+	.get_ringparam = hns3_get_ringparam,
+	.set_ringparam = hns3_set_ringparam,
+	.get_strings = hns3_get_strings,
+	.get_ethtool_stats = hns3_get_stats,
+	.get_sset_count = hns3_get_sset_count,
+	.get_rxnfc = hns3_get_rxnfc,
+	.get_rxfh_key_size = hns3_get_rss_key_size,
+	.get_rxfh_indir_size = hns3_get_rss_indir_size,
+	.get_rxfh = hns3_get_rss,
+	.set_rxfh = hns3_set_rss,
+	.get_link_ksettings = hns3_get_link_ksettings,
+};
+
 static const struct ethtool_ops hns3_ethtool_ops = {
 	.self_test = hns3_self_test,
 	.get_drvinfo = hns3_get_drvinfo,
@@ -872,5 +887,10 @@ static const struct ethtool_ops hns3_ethtool_ops = {
 
 void hns3_ethtool_set_ops(struct net_device *netdev)
 {
-	netdev->ethtool_ops = &hns3_ethtool_ops;
+	struct hnae3_handle *h = hns3_get_handle(netdev);
+
+	if (h->flags & HNAE3_SUPPORT_VF)
+		netdev->ethtool_ops = &hns3vf_ethtool_ops;
+	else
+		netdev->ethtool_ops = &hns3_ethtool_ops;
 }

drivers/net/ethernet/hisilicon/hns3/hns3pf/Makefile

@@ -8,8 +8,3 @@ obj-$(CONFIG_HNS3_HCLGE) += hclge.o
 hclge-objs = hclge_main.o hclge_cmd.o hclge_mdio.o hclge_tm.o
 
 hclge-$(CONFIG_HNS3_DCB) += hclge_dcb.o
-
-obj-$(CONFIG_HNS3_ENET) += hns3.o
-hns3-objs = hns3_enet.o hns3_ethtool.o
-
-hns3-$(CONFIG_HNS3_DCB) += hns3_dcbnl.o

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

@@ -310,6 +310,7 @@ static int hclgevf_set_handle_info(struct hclgevf_dev *hdev)
 	nic->ae_algo = &ae_algovf;
 	nic->pdev = hdev->pdev;
 	nic->numa_node_mask = hdev->numa_node_mask;
+	nic->flags |= HNAE3_SUPPORT_VF;
 
 	if (hdev->ae_dev->dev_type != HNAE3_DEV_KNIC) {
 		dev_err(&hdev->pdev->dev, "unsupported device type %d\n",