From: Peng Li <lipeng321@huawei.com>
Date: Thu, 28 Jun 2018 12:12:23 +0800
Subject: net: hns3: add unlikely for error check
Patch-mainline: v4.19-rc1
Git-commit: 0e6084aa1c4eba8913143ea30254d50ed01724eb
References: bsc#1104353 FATE#326415

The first bd of a packet is invalid and invalid ring head for tx
IRQ is not offen, they may occur when there is error,
Add unlikely for error check branch is better for performance.

Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/hisilicon/hns3/hns3_enet.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -1895,7 +1895,7 @@ bool hns3_clean_tx_ring(struct hns3_enet
 	if (is_ring_empty(ring) || head == ring->next_to_clean)
 		return true; /* no data to poll */
 
-	if (!is_valid_clean_head(ring, head)) {
+	if (unlikely(!is_valid_clean_head(ring, head))) {
 		netdev_err(netdev, "wrong head (%d, %d-%d)\n", head,
 			   ring->next_to_use, ring->next_to_clean);
 
@@ -2152,7 +2152,7 @@ static int hns3_handle_rx_bd(struct hns3
 	bd_base_info = le32_to_cpu(desc->rx.bd_base_info);
 
 	/* Check valid BD */
-	if (!hnae_get_bit(bd_base_info, HNS3_RXD_VLD_B))
+	if (unlikely(!hnae_get_bit(bd_base_info, HNS3_RXD_VLD_B)))
 		return -EFAULT;
 
 	va = (unsigned char *)desc_cb->buf + desc_cb->page_offset;