linux-kernel - [PATCH net-next 07/20] net: hns3: Mask the packet statistics query when NIC is down

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Date:   Fri, 5 Jan 2018 18:18:11 +0800
From:   Peng Li <lipeng321@...wei.com>
To:     <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...wei.com>, <salil.mehta@...wei.com>,
        <lipeng321@...wei.com>
Subject: [PATCH net-next 07/20] net: hns3: Mask the packet statistics query when NIC is down

From: Jian Shen <shenjian15@...wei.com>

Update the HNS3_NIC_STATE_DOWN bit when NIC state changes.
When NIC is down, mask the packet statistics for querying
with ifconfig command. It's a common practice.

Signed-off-by: Jian Shen <shenjian15@...wei.com>
Signed-off-by: Peng Li <lipeng321@...wei.com>
---
 drivers/net/ethernet/hisilicon/hns3/hns3_enet.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index 79c5daa..a8e4406 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -247,6 +247,8 @@ static int hns3_nic_net_up(struct net_device *netdev)
 	if (ret)
 		goto out_start_err;
 
+	clear_bit(HNS3_NIC_STATE_DOWN, &priv->state);
+
 	return 0;
 
 out_start_err:
@@ -286,6 +288,9 @@ static void hns3_nic_net_down(struct net_device *netdev)
 	const struct hnae3_ae_ops *ops;
 	int i;
 
+	if (test_and_set_bit(HNS3_NIC_STATE_DOWN, &priv->state))
+		return;
+
 	/* stop ae_dev */
 	ops = priv->ae_handle->ae_algo->ops;
 	if (ops->stop)
@@ -1135,6 +1140,9 @@ static int hns3_nic_set_features(struct net_device *netdev,
 	u64 tx_pkts = 0;
 	u64 rx_pkts = 0;
 
+	if (test_bit(HNS3_NIC_STATE_DOWN, &priv->state))
+		return;
+
 	handle->ae_algo->ops->update_stats(handle, &netdev->stats);
 
 	for (idx = 0; idx < queue_num; idx++) {
-- 
1.9.1