From: Huazhong Tan <tanhuazhong@huawei.com>
Date: Wed, 7 Nov 2018 12:06:12 +0800
Subject: net: hns3: use HNS3_NIC_STATE_RESETTING to indicate resetting
Patch-mainline: v5.0-rc1
Git-commit: 257e4f29946ab8e257ee9bfbc35e680726298571
References: bsc#1104353 FATE#326415

While hclge is going to reset, it will notify its client with
HNAE3_DOWN_CLIENT, so this client should get into a resetting
status from this moment, other operations from the stack need to
be blocked as well. And when the reset is finished, the client
will be notified with HNAE3_UP_CLIENT, so this is the end of
the resetting status.

This patch uses HNS3_NIC_STATE_RESETTING flag to implement that,
and adds hns3_nic_resetting() to indicate which operation is not
allowed.

Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/hisilicon/hns3/hns3_dcbnl.c   |   12 ++++++++++++
 drivers/net/ethernet/hisilicon/hns3/hns3_enet.c    |   10 ++++++++++
 drivers/net/ethernet/hisilicon/hns3/hns3_enet.h    |    7 +++++++
 drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c |   19 +++++++++++++++++++
 4 files changed, 48 insertions(+)

--- a/drivers/net/ethernet/hisilicon/hns3/hns3_dcbnl.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_dcbnl.c
@@ -9,6 +9,9 @@ int hns3_dcbnl_ieee_getets(struct net_de
 {
 	struct hnae3_handle *h = hns3_get_handle(ndev);
 
+	if (hns3_nic_resetting(ndev))
+		return -EBUSY;
+
 	if (h->kinfo.dcb_ops->ieee_getets)
 		return h->kinfo.dcb_ops->ieee_getets(h, ets);
 
@@ -20,6 +23,9 @@ int hns3_dcbnl_ieee_setets(struct net_de
 {
 	struct hnae3_handle *h = hns3_get_handle(ndev);
 
+	if (hns3_nic_resetting(ndev))
+		return -EBUSY;
+
 	if (h->kinfo.dcb_ops->ieee_setets)
 		return h->kinfo.dcb_ops->ieee_setets(h, ets);
 
@@ -31,6 +37,9 @@ int hns3_dcbnl_ieee_getpfc(struct net_de
 {
 	struct hnae3_handle *h = hns3_get_handle(ndev);
 
+	if (hns3_nic_resetting(ndev))
+		return -EBUSY;
+
 	if (h->kinfo.dcb_ops->ieee_getpfc)
 		return h->kinfo.dcb_ops->ieee_getpfc(h, pfc);
 
@@ -42,6 +51,9 @@ int hns3_dcbnl_ieee_setpfc(struct net_de
 {
 	struct hnae3_handle *h = hns3_get_handle(ndev);
 
+	if (hns3_nic_resetting(ndev))
+		return -EBUSY;
+
 	if (h->kinfo.dcb_ops->ieee_setpfc)
 		return h->kinfo.dcb_ops->ieee_setpfc(h, pfc);
 
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -384,6 +384,9 @@ static int hns3_nic_net_open(struct net_
 	struct hnae3_knic_private_info *kinfo;
 	int i, ret;
 
+	if (hns3_nic_resetting(netdev))
+		return -EBUSY;
+
 	netif_carrier_off(netdev);
 
 	ret = hns3_nic_set_real_num_queue(netdev);
@@ -3747,6 +3750,10 @@ static int hns3_reset_notify_down_enet(s
 	struct hnae3_ae_dev *ae_dev = pci_get_drvdata(handle->pdev);
 	struct hnae3_knic_private_info *kinfo = &handle->kinfo;
 	struct net_device *ndev = kinfo->netdev;
+	struct hns3_nic_priv *priv = netdev_priv(ndev);
+
+	if (test_and_set_bit(HNS3_NIC_STATE_RESETTING, &priv->state))
+		return 0;
 
 	/* it is cumbersome for hardware to pick-and-choose entries for deletion
 	 * from table space. Hence, for function reset software intervention is
@@ -3766,6 +3773,7 @@ static int hns3_reset_notify_down_enet(s
 static int hns3_reset_notify_up_enet(struct hnae3_handle *handle)
 {
 	struct hnae3_knic_private_info *kinfo = &handle->kinfo;
+	struct hns3_nic_priv *priv = netdev_priv(kinfo->netdev);
 	int ret = 0;
 
 	if (netif_running(kinfo->netdev)) {
@@ -3778,6 +3786,8 @@ static int hns3_reset_notify_up_enet(str
 		handle->last_reset_time = jiffies;
 	}
 
+	clear_bit(HNS3_NIC_STATE_RESETTING, &priv->state);
+
 	return ret;
 }
 
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h
@@ -599,6 +599,13 @@ static inline bool hns3_dev_ongoing_func
 #define hns3_read_dev(a, reg) \
 	hns3_read_reg((a)->io_base, (reg))
 
+static inline bool hns3_nic_resetting(struct net_device *netdev)
+{
+	struct hns3_nic_priv *priv = netdev_priv(netdev);
+
+	return test_bit(HNS3_NIC_STATE_RESETTING, &priv->state);
+}
+
 #define hns3_write_dev(a, reg, value) \
 	hns3_write_reg((a)->io_base, (reg), (value))
 
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
@@ -291,6 +291,11 @@ static void hns3_self_test(struct net_de
 	int test_index = 0;
 	u32 i;
 
+	if (hns3_nic_resetting(ndev)) {
+		netdev_err(ndev, "dev resetting!");
+		return;
+	}
+
 	/* Only do offline selftest, or pass by default */
 	if (eth_test->flags != ETH_TEST_FL_OFFLINE)
 		return;
@@ -530,6 +535,11 @@ static void hns3_get_ringparam(struct ne
 	struct hnae3_handle *h = priv->ae_handle;
 	int queue_num = h->kinfo.num_tqps;
 
+	if (hns3_nic_resetting(netdev)) {
+		netdev_err(netdev, "dev resetting!");
+		return;
+	}
+
 	param->tx_max_pending = HNS3_RING_MAX_PENDING;
 	param->rx_max_pending = HNS3_RING_MAX_PENDING;
 
@@ -760,6 +770,9 @@ static int hns3_set_ringparam(struct net
 	u32 old_desc_num, new_desc_num;
 	int ret;
 
+	if (hns3_nic_resetting(ndev))
+		return -EBUSY;
+
 	if (param->rx_mini_pending || param->rx_jumbo_pending)
 		return -EINVAL;
 
@@ -872,6 +885,9 @@ static int hns3_get_coalesce_per_queue(s
 	struct hnae3_handle *h = priv->ae_handle;
 	u16 queue_num = h->kinfo.num_tqps;
 
+	if (hns3_nic_resetting(netdev))
+		return -EBUSY;
+
 	if (queue >= queue_num) {
 		netdev_err(netdev,
 			   "Invalid queue value %d! Queue max id=%d\n",
@@ -1033,6 +1049,9 @@ static int hns3_set_coalesce(struct net_
 	int ret;
 	int i;
 
+	if (hns3_nic_resetting(netdev))
+		return -EBUSY;
+
 	ret = hns3_check_coalesce_para(netdev, cmd);
 	if (ret)
 		return ret;