[PATCH V3 net-next 08/10] net: hns3: add a check for ethtool priv-flag interface

[Huazhong Tan <tanhuazhong@huawei.com>]

Add a check for hns3_set_priv_flags() since if the capability
is unsupported its private flags should not be modified as well.

Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
---
 drivers/net/ethernet/hisilicon/hns3/hnae3.h        |  1 +
 drivers/net/ethernet/hisilicon/hns3/hns3_enet.c    |  1 +
 drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c | 19 +++++++++++++++++++
 3 files changed, 21 insertions(+)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hnae3.h b/drivers/net/ethernet/hisilicon/hns3/hnae3.h
index 18b3e43..3642740 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hnae3.h
+++ b/drivers/net/ethernet/hisilicon/hns3/hnae3.h
@@ -744,6 +744,7 @@ struct hnae3_handle {
 	/* Network interface message level enabled bits */
 	u32 msg_enable;
 
+	unsigned long supported_pflags;
 	unsigned long priv_flags;
 };
 
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index f686723..c30cf9e 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -4152,6 +4152,7 @@ static void hns3_state_init(struct hnae3_handle *handle)
 	set_bit(HNS3_NIC_STATE_INITED, &priv->state);
 	set_bit(HNS3_NIC_STATE_DIM_ENABLE, &priv->state);
 	handle->priv_flags |= BIT(HNAE3_PFLAG_DIM_ENABLE);
+	set_bit(HNAE3_PFLAG_DIM_ENABLE, &handle->supported_pflags);
 }
 
 static int hns3_client_init(struct hnae3_handle *handle)
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
index e8adc70..7462d43 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
@@ -1561,12 +1561,31 @@ static u32 hns3_get_priv_flags(struct net_device *netdev)
 	return handle->priv_flags;
 }
 
+static int hns3_check_priv_flags(struct hnae3_handle *h, u32 changed)
+{
+	u32 i;
+
+	for (i = 0; i < HNAE3_PFLAG_MAX; i++)
+		if ((changed & BIT(i)) && !test_bit(i, &h->supported_pflags)) {
+			netdev_err(h->netdev, "%s is unsupported\n",
+				   hns3_priv_flags[i].name);
+			return -EOPNOTSUPP;
+		}
+
+	return 0;
+}
+
 static int hns3_set_priv_flags(struct net_device *netdev, u32 pflags)
 {
 	struct hnae3_handle *handle = hns3_get_handle(netdev);
 	u32 changed = pflags ^ handle->priv_flags;
+	int ret;
 	u32 i;
 
+	ret = hns3_check_priv_flags(handle, changed);
+	if (ret)
+		return ret;
+
 	for (i = 0; i < HNAE3_PFLAG_MAX; i++) {
 		if (changed & BIT(i)) {
 			bool enable = !(handle->priv_flags & BIT(i));
-- 
2.7.4