From: Huazhong Tan <tanhuazhong@huawei.com>
Date: Thu, 7 Nov 2019 09:30:19 +0800
Subject: net: hns3: add compatible handling for command HCLGE_OPC_PF_RST_DONE
Patch-mainline: v5.4-rc7
Git-commit: 648db0514a3808eead513d7abfaf650d02a64d5c
References: git-fixes

Since old firmware does not support HCLGE_OPC_PF_RST_DONE, it will
return -EOPNOTSUPP to the driver when received this command. So
for this case, it should just print a warning and return success
to the caller.

Fixes: 72e2fb07997c ("net: hns3: clear reset interrupt status in hclge_irq_handle()")
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/hns3pf/hclge_main.c |   18 +++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
@@ -3392,12 +3392,28 @@ static int hclge_set_rst_done(struct hcl
 {
 	struct hclge_pf_rst_done_cmd *req;
 	struct hclge_desc desc;
+	int ret;
 
 	req = (struct hclge_pf_rst_done_cmd *)desc.data;
 	hclge_cmd_setup_basic_desc(&desc, HCLGE_OPC_PF_RST_DONE, false);
 	req->pf_rst_done |= HCLGE_PF_RESET_DONE_BIT;
 
-	return hclge_cmd_send(&hdev->hw, &desc, 1);
+	ret = hclge_cmd_send(&hdev->hw, &desc, 1);
+	/* To be compatible with the old firmware, which does not support
+	 * command HCLGE_OPC_PF_RST_DONE, just print a warning and
+	 * return success
+	 */
+	if (ret == -EOPNOTSUPP) {
+		dev_warn(&hdev->pdev->dev,
+			 "current firmware does not support command(0x%x)!\n",
+			 HCLGE_OPC_PF_RST_DONE);
+		return 0;
+	} else if (ret) {
+		dev_err(&hdev->pdev->dev, "assert PF reset done fail %d!\n",
+			ret);
+	}
+
+	return ret;
 }
 
 static int hclge_reset_prepare_up(struct hclge_dev *hdev)