net: hns3: add unlikely for error handling in data path

This patch adds unlikely hint for error handling in critical data
path.

Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index 33ac732..50bfdba 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -619,7 +619,7 @@ static int hns3_set_tso(struct sk_buff *skb, u32 *paylen,
                return 0;
 
        ret = skb_cow_head(skb, 0);
-       if (ret)
+       if (unlikely(ret))
                return ret;
 
        l3.hdr = skb_network_header(skb);
@@ -1012,7 +1012,7 @@ static int hns3_fill_desc_vtags(struct sk_buff *skb,
                int rc;
 
                rc = skb_cow_head(skb, 0);
-               if (rc < 0)
+               if (unlikely(rc < 0))
                        return rc;
                vhdr = (struct vlan_ethhdr *)skb->data;
                vhdr->h_vlan_TCI |= cpu_to_be16((skb->priority & 0x7)
@@ -1057,7 +1057,7 @@ static int hns3_fill_desc(struct hns3_enet_ring *ring, void *priv,
                        skb_reset_mac_len(skb);
 
                        ret = hns3_get_l4_protocol(skb, &ol4_proto, &il4_proto);
-                       if (ret)
+                       if (unlikely(ret))
                                return ret;
                        hns3_set_l2l3l4_len(skb, ol4_proto, il4_proto,
                                            &type_cs_vlan_tso,
@@ -1065,12 +1065,12 @@ static int hns3_fill_desc(struct hns3_enet_ring *ring, void *priv,
                        ret = hns3_set_l3l4_type_csum(skb, ol4_proto, il4_proto,
                                                      &type_cs_vlan_tso,
                                                      &ol_type_vlan_len_msec);
-                       if (ret)
+                       if (unlikely(ret))
                                return ret;
 
                        ret = hns3_set_tso(skb, &paylen, &mss,
                                           &type_cs_vlan_tso);
-                       if (ret)
+                       if (unlikely(ret))
                                return ret;
                }
 
@@ -1090,7 +1090,7 @@ static int hns3_fill_desc(struct hns3_enet_ring *ring, void *priv,
                dma = skb_frag_dma_map(dev, frag, 0, size, DMA_TO_DEVICE);
        }
 
-       if (dma_mapping_error(ring->dev, dma)) {
+       if (unlikely(dma_mapping_error(ring->dev, dma))) {
                ring->stats.sw_err_cnt++;
                return -ENOMEM;
        }
@@ -1150,7 +1150,7 @@ static int hns3_nic_maybe_stop_tso(struct sk_buff **out_skb, int *bnum,
                size = skb_frag_size(frag);
                bdnum_for_frag = (size + HNS3_MAX_BD_SIZE - 1) >>
                                 HNS3_MAX_BD_SIZE_OFFSET;
-               if (bdnum_for_frag > HNS3_MAX_BD_PER_FRAG)
+               if (unlikely(bdnum_for_frag > HNS3_MAX_BD_PER_FRAG))
                        return -ENOMEM;
 
                buf_num += bdnum_for_frag;
@@ -1281,7 +1281,7 @@ netdev_tx_t hns3_nic_net_xmit(struct sk_buff *skb, struct net_device *netdev)
 
        ret = hns3_fill_desc(ring, skb, size, seg_num == 1 ? 1 : 0,
                             DESC_TYPE_SKB);
-       if (ret)
+       if (unlikely(ret))
                goto head_fill_err;
 
        next_to_use_frag = ring->next_to_use;
@@ -1294,7 +1294,7 @@ netdev_tx_t hns3_nic_net_xmit(struct sk_buff *skb, struct net_device *netdev)
                                     seg_num - 1 == i ? 1 : 0,
                                     DESC_TYPE_PAGE);
 
-               if (ret)
+               if (unlikely(ret))
                        goto frag_fill_err;
        }