net: hns: All ports can not work when insmod hns ko after rmmod.

There are two test cases:
1. Remove the 4 modules:hns_enet_drv/hns_dsaf/hnae/hns_mdio,
   and install them again, must use "ifconfig down/ifconfig up"
   command pair to bring port to work.

   This patch calls phy_stop function when init phy to fix this bug.

2. Remove the 2 modules:hns_enet_drv/hns_dsaf, and install them again,
   all ports can not use anymore, because of the phy devices register
   failed(phy devices already exists).

   Phy devices are registered when hns_dsaf installed, this patch
   removes them when hns_dsaf removed.

The two cases are sometimes related, fixing the second case also requires
fixing the first case, so fix them together.

Signed-off-by: Yonglong Liu <liuyonglong@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns/hns_dsaf_mac.c

@@ -778,6 +778,17 @@ static int hns_mac_register_phy(struct hns_mac_cb *mac_cb)
 	return rc;
 }
 
+static void hns_mac_remove_phydev(struct hns_mac_cb *mac_cb)
+{
+	if (!to_acpi_device_node(mac_cb->fw_port) || !mac_cb->phy_dev)
+		return;
+
+	phy_device_remove(mac_cb->phy_dev);
+	phy_device_free(mac_cb->phy_dev);
+
+	mac_cb->phy_dev = NULL;
+}
+
 #define MAC_MEDIA_TYPE_MAX_LEN		16
 
 static const struct {
@@ -1117,7 +1128,11 @@ void hns_mac_uninit(struct dsaf_device *dsaf_dev)
 	int max_port_num = hns_mac_get_max_port_num(dsaf_dev);
 
 	for (i = 0; i < max_port_num; i++) {
+		if (!dsaf_dev->mac_cb[i])
+			continue;
+
 		dsaf_dev->misc_op->cpld_reset_led(dsaf_dev->mac_cb[i]);
+		hns_mac_remove_phydev(dsaf_dev->mac_cb[i]);
 		dsaf_dev->mac_cb[i] = NULL;
 	}
 }

drivers/net/ethernet/hisilicon/hns/hns_enet.c

@@ -1186,6 +1186,9 @@ int hns_nic_init_phy(struct net_device *ndev, struct hnae_handle *h)
 	if (h->phy_if == PHY_INTERFACE_MODE_XGMII)
 		phy_dev->autoneg = false;
 
+	if (h->phy_if == PHY_INTERFACE_MODE_SGMII)
+		phy_stop(phy_dev);
+
 	return 0;
 }