linux-kernel - [PATCH net-next 04/12] net: hns3: return 0 and print warning when hit duplicate MAC

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Date:   Wed, 3 Apr 2019 11:07:53 +0800
From:   Huazhong Tan <tanhuazhong@...wei.com>
To:     <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <salil.mehta@...wei.com>, <yisen.zhuang@...wei.com>,
        <linuxarm@...wei.com>, Peng Li <lipeng321@...wei.com>,
        Huazhong Tan <tanhuazhong@...wei.com>
Subject: [PATCH net-next 04/12] net: hns3: return 0 and print warning when hit duplicate MAC

From: Peng Li <lipeng321@...wei.com>

When set 2 same MAC to different function of one port, IMP
will return error as the later one may modify the origin one.
This will cause bond fail for 2 VFs of one port.

Driver just print warning and return 0 with this patch, so
if set same MAC address, it will return 0 but do not really
configure to HW.

Signed-off-by: Peng Li <lipeng321@...wei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@...wei.com>
---
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
index e742a05..d45789e 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
@@ -5962,8 +5962,11 @@ int hclge_add_uc_addr_common(struct hclge_vport *vport,
 	}
 
 	/* check if we just hit the duplicate */
-	if (!ret)
-		ret = -EINVAL;
+	if (!ret) {
+		dev_warn(&hdev->pdev->dev, "VF %d mac(%pM) has been existed\n",
+			 vport->vport_id, addr);
+		return 0;
+	}
 
 	dev_err(&hdev->pdev->dev,
 		"PF failed to add unicast entry(%pM) in the MAC table\n",
-- 
2.7.4