[PATCH 20.11] net/hns3: support backplane media type

[Huisong Li <lihuisong@huawei.com>]

From: Chengwen Feng <fengchengwen@huawei.com>

[ upstream commit 916508f002ae887942ab3b970db33c0cc7fc6c02 ]

The 802.11 physical PMA sub-layer defines three media: copper, fiber and
backplane. For PMD, the backplane is similar to the fiber, the main
differences are that backplane doesn't have optical module.

Because the interface of firmware fiber is also applicable to the
backplane, this patch supports the backplane only through simple
extension.

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
Signed-off-by: Dongdong Liu <liudongdong3@huawei.com>
---
 drivers/net/hns3/hns3_ethdev.c | 41 ++++++++++++++++++++++++++--------
 1 file changed, 32 insertions(+), 9 deletions(-)

diff --git a/drivers/net/hns3/hns3_ethdev.c b/drivers/net/hns3/hns3_ethdev.c
index b2ff59ef62..f5fdcafa4f 100644
--- a/drivers/net/hns3/hns3_ethdev.c
+++ b/drivers/net/hns3/hns3_ethdev.c
@@ -3139,6 +3139,34 @@ hns3_get_capability(struct hns3_hw *hw)
 	return 0;
 }
 
+static int
+hns3_check_media_type(struct hns3_hw *hw, uint8_t media_type)
+{
+	int ret;
+
+	switch (media_type) {
+	case HNS3_MEDIA_TYPE_COPPER:
+		if (!hns3_dev_copper_supported(hw)) {
+			PMD_INIT_LOG(ERR,
+				     "Media type is copper, not supported.");
+			ret = -EOPNOTSUPP;
+		} else {
+			ret = 0;
+		}
+		break;
+	case HNS3_MEDIA_TYPE_FIBER:
+	case HNS3_MEDIA_TYPE_BACKPLANE:
+		ret = 0;
+		break;
+	default:
+		PMD_INIT_LOG(ERR, "Unknown media type = %u!", media_type);
+		ret = -EINVAL;
+		break;
+	}
+
+	return ret;
+}
+
 static int
 hns3_get_board_configuration(struct hns3_hw *hw)
 {
@@ -3153,11 +3181,9 @@ hns3_get_board_configuration(struct hns3_hw *hw)
 		return ret;
 	}
 
-	if (cfg.media_type == HNS3_MEDIA_TYPE_COPPER &&
-	    !hns3_dev_copper_supported(hw)) {
-		PMD_INIT_LOG(ERR, "media type is copper, not supported.");
-		return -EOPNOTSUPP;
-	}
+	ret = hns3_check_media_type(hw, cfg.media_type);
+	if (ret)
+		return ret;
 
 	hw->mac.media_type = cfg.media_type;
 	hw->rss_size_max = cfg.rss_size_max;
@@ -4488,14 +4514,11 @@ hns3_update_link_info(struct rte_eth_dev *eth_dev)
 {
 	struct hns3_adapter *hns = eth_dev->data->dev_private;
 	struct hns3_hw *hw = &hns->hw;
-	int ret = 0;
 
 	if (hw->mac.media_type == HNS3_MEDIA_TYPE_COPPER)
 		return 0;
-	else if (hw->mac.media_type == HNS3_MEDIA_TYPE_FIBER)
-		ret = hns3_update_fiber_link_info(hw);
 
-	return ret;
+	return hns3_update_fiber_link_info(hw);
 }
 
 static int
-- 
2.22.0