net: hns3: Add support for serdes loopback selftest

This patch adds support for serdes loopback selftest in hns3
driver.
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c

@@ -53,7 +53,7 @@ static const struct hns3_stats hns3_rxq_stats[] = {
 
 #define HNS3_TQP_STATS_COUNT (HNS3_TXQ_STATS_COUNT + HNS3_RXQ_STATS_COUNT)
 
-#define HNS3_SELF_TEST_TPYE_NUM		1
+#define HNS3_SELF_TEST_TYPE_NUM		2
 #define HNS3_NIC_LB_TEST_PKT_NUM	1
 #define HNS3_NIC_LB_TEST_RING_ID	0
 #define HNS3_NIC_LB_TEST_PACKET_SIZE	128
@@ -78,6 +78,7 @@ static int hns3_lp_setup(struct net_device *ndev, enum hnae3_loop loop, bool en)
 		return -EOPNOTSUPP;
 
 	switch (loop) {
+	case HNAE3_MAC_INTER_LOOP_SERDES:
 	case HNAE3_MAC_INTER_LOOP_MAC:
 		ret = h->ae_algo->ops->set_loopback(h, loop, en);
 		break;
@@ -287,7 +288,7 @@ static void hns3_self_test(struct net_device *ndev,
 {
 	struct hns3_nic_priv *priv = netdev_priv(ndev);
 	struct hnae3_handle *h = priv->ae_handle;
-	int st_param[HNS3_SELF_TEST_TPYE_NUM][2];
+	int st_param[HNS3_SELF_TEST_TYPE_NUM][2];
 	bool if_running = netif_running(ndev);
 #if IS_ENABLED(CONFIG_VLAN_8021Q)
 	bool dis_vlan_filter;
@@ -303,6 +304,10 @@ static void hns3_self_test(struct net_device *ndev,
 	st_param[HNAE3_MAC_INTER_LOOP_MAC][1] =
 			h->flags & HNAE3_SUPPORT_MAC_LOOPBACK;
 
+	st_param[HNAE3_MAC_INTER_LOOP_SERDES][0] = HNAE3_MAC_INTER_LOOP_SERDES;
+	st_param[HNAE3_MAC_INTER_LOOP_SERDES][1] =
+			h->flags & HNAE3_SUPPORT_SERDES_LOOPBACK;
+
 	if (if_running)
 		dev_close(ndev);
 
@@ -316,7 +321,7 @@ static void hns3_self_test(struct net_device *ndev,
 
 	set_bit(HNS3_NIC_STATE_TESTING, &priv->state);
 
-	for (i = 0; i < HNS3_SELF_TEST_TPYE_NUM; i++) {
+	for (i = 0; i < HNS3_SELF_TEST_TYPE_NUM; i++) {
 		enum hnae3_loop loop_type = (enum hnae3_loop)st_param[i][0];
 
 		if (!st_param[i][1])

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.h

@@ -94,6 +94,7 @@ enum hclge_opcode_type {
 	HCLGE_OPC_QUERY_LINK_STATUS	= 0x0307,
 	HCLGE_OPC_CONFIG_MAX_FRM_SIZE	= 0x0308,
 	HCLGE_OPC_CONFIG_SPEED_DUP	= 0x0309,
+	HCLGE_OPC_SERDES_LOOPBACK       = 0x0315,
 
 	/* PFC/Pause commands */
 	HCLGE_OPC_CFG_MAC_PAUSE_EN      = 0x0701,
@@ -775,6 +776,17 @@ struct hclge_reset_cmd {
 	u8 fun_reset_vfid;
 	u8 rsv[22];
 };
+
+#define HCLGE_CMD_SERDES_SERIAL_INNER_LOOP_B	BIT(0)
+#define HCLGE_CMD_SERDES_DONE_B			BIT(0)
+#define HCLGE_CMD_SERDES_SUCCESS_B		BIT(1)
+struct hclge_serdes_lb_cmd {
+	u8 mask;
+	u8 enable;
+	u8 result;
+	u8 rsv[21];
+};
+
 #define HCLGE_DEFAULT_TX_BUF		0x4000	 /* 16k  bytes */
 #define HCLGE_TOTAL_PKT_BUF		0x108000 /* 1.03125M bytes */
 #define HCLGE_DEFAULT_DV		0xA000	 /* 40k byte */

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c

@@ -787,9 +787,10 @@ static int hclge_get_sset_count(struct hnae3_handle *handle, int stringset)
 		    hdev->hw.mac.speed == HCLGE_MAC_SPEED_1G) {
 			count += 1;
 			handle->flags |= HNAE3_SUPPORT_MAC_LOOPBACK;
-		} else {
-			count = -EOPNOTSUPP;
 		}
+
+		count++;
+		handle->flags |= HNAE3_SUPPORT_SERDES_LOOPBACK;
 	} else if (stringset == ETH_SS_STATS) {
 		count = ARRAY_SIZE(g_mac_stats_string) +
 			ARRAY_SIZE(g_all_32bit_stats_string) +
@@ -3670,6 +3671,55 @@ static int hclge_set_mac_loopback(struct hclge_dev *hdev, bool en)
 	return ret;
 }
 
+static int hclge_set_serdes_loopback(struct hclge_dev *hdev, bool en)
+{
+#define HCLGE_SERDES_RETRY_MS	10
+#define HCLGE_SERDES_RETRY_NUM	100
+	struct hclge_serdes_lb_cmd *req;
+	struct hclge_desc desc;
+	int ret, i = 0;
+
+	req = (struct hclge_serdes_lb_cmd *)&desc.data[0];
+	hclge_cmd_setup_basic_desc(&desc, HCLGE_OPC_SERDES_LOOPBACK, false);
+
+	if (en) {
+		req->enable = HCLGE_CMD_SERDES_SERIAL_INNER_LOOP_B;
+		req->mask = HCLGE_CMD_SERDES_SERIAL_INNER_LOOP_B;
+	} else {
+		req->mask = HCLGE_CMD_SERDES_SERIAL_INNER_LOOP_B;
+	}
+
+	ret = hclge_cmd_send(&hdev->hw, &desc, 1);
+	if (ret) {
+		dev_err(&hdev->pdev->dev,
+			"serdes loopback set fail, ret = %d\n", ret);
+		return ret;
+	}
+
+	do {
+		msleep(HCLGE_SERDES_RETRY_MS);
+		hclge_cmd_setup_basic_desc(&desc, HCLGE_OPC_SERDES_LOOPBACK,
+					   true);
+		ret = hclge_cmd_send(&hdev->hw, &desc, 1);
+		if (ret) {
+			dev_err(&hdev->pdev->dev,
+				"serdes loopback get, ret = %d\n", ret);
+			return ret;
+		}
+	} while (++i < HCLGE_SERDES_RETRY_NUM &&
+		 !(req->result & HCLGE_CMD_SERDES_DONE_B));
+
+	if (!(req->result & HCLGE_CMD_SERDES_DONE_B)) {
+		dev_err(&hdev->pdev->dev, "serdes loopback set timeout\n");
+		return -EBUSY;
+	} else if (!(req->result & HCLGE_CMD_SERDES_SUCCESS_B)) {
+		dev_err(&hdev->pdev->dev, "serdes loopback set failed in fw\n");
+		return -EIO;
+	}
+
+	return 0;
+}
+
 static int hclge_set_loopback(struct hnae3_handle *handle,
 			      enum hnae3_loop loop_mode, bool en)
 {
@@ -3681,6 +3731,9 @@ static int hclge_set_loopback(struct hnae3_handle *handle,
 	case HNAE3_MAC_INTER_LOOP_MAC:
 		ret = hclge_set_mac_loopback(hdev, en);
 		break;
+	case HNAE3_MAC_INTER_LOOP_SERDES:
+		ret = hclge_set_serdes_loopback(hdev, en);
+		break;
 	default:
 		ret = -ENOTSUPP;
 		dev_err(&hdev->pdev->dev,