net: hns3: VF not request link status when PF support push link status feature

To reduce the processing of unnecessary mailbox command when PF supports
actively push its link status to VFs, VFs stop sending request link
status command in periodic service task in this case.
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c

@@ -2340,10 +2340,11 @@ static void hclgevf_periodic_service_task(struct hclgevf_dev *hdev)
 	if (!(hdev->serv_processed_cnt % HCLGEVF_STATS_TIMER_INTERVAL))
 		hclgevf_tqps_update_stats(handle);
 
-	/* request the link status from the PF. PF would be able to tell VF
-	 * about such updates in future so we might remove this later
+	/* VF does not need to request link status when this bit is set, because
+	 * PF will push its link status to VFs when link status changed.
 	 */
-	hclgevf_request_link_info(hdev);
+	if (!test_bit(HCLGEVF_STATE_PF_PUSH_LINK_STATUS, &hdev->state))
+		hclgevf_request_link_info(hdev);
 
 	hclgevf_update_link_mode(hdev);
 
@@ -2657,6 +2658,7 @@ static int hclgevf_ae_start(struct hnae3_handle *handle)
 	struct hclgevf_dev *hdev = hclgevf_ae_get_hdev(handle);
 
 	clear_bit(HCLGEVF_STATE_DOWN, &hdev->state);
+	clear_bit(HCLGEVF_STATE_PF_PUSH_LINK_STATUS, &hdev->state);
 
 	hclgevf_reset_tqp_stats(handle);
 

drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.h

@@ -152,6 +152,7 @@ enum hclgevf_states {
 	HCLGEVF_STATE_LINK_UPDATING,
 	HCLGEVF_STATE_PROMISC_CHANGED,
 	HCLGEVF_STATE_RST_FAIL,
+	HCLGEVF_STATE_PF_PUSH_LINK_STATUS,
 };
 
 struct hclgevf_mac {

drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_mbx.c

@@ -276,6 +276,7 @@ void hclgevf_mbx_async_handler(struct hclgevf_dev *hdev)
 	u8 duplex;
 	u32 speed;
 	u32 tail;
+	u8 flag;
 	u8 idx;
 
 	/* we can safely clear it now as we are at start of the async message
@@ -300,11 +301,16 @@ void hclgevf_mbx_async_handler(struct hclgevf_dev *hdev)
 			link_status = msg_q[1];
 			memcpy(&speed, &msg_q[2], sizeof(speed));
 			duplex = (u8)msg_q[4];
+			flag = (u8)msg_q[5];
 
 			/* update upper layer with new link link status */
 			hclgevf_update_link_status(hdev, link_status);
 			hclgevf_update_speed_duplex(hdev, speed, duplex);
 
+			if (flag & HCLGE_MBX_PUSH_LINK_STATUS_EN)
+				set_bit(HCLGEVF_STATE_PF_PUSH_LINK_STATUS,
+					&hdev->state);
+
 			break;
 		case HCLGE_MBX_LINK_STAT_MODE:
 			idx = (u8)msg_q[1];