net: hns3: limit some variable scope in critical data path

This patch limits some variables' scope as much as possible in
hns3_fill_desc.

Also, only set l3_type and l4_type when necessary.

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 14c3aa7..a84060f 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -1029,26 +1029,21 @@ static int hns3_fill_desc(struct hns3_enet_ring *ring, void *priv,
        struct hns3_desc_cb *desc_cb = &ring->desc_cb[ring->next_to_use];
        struct hns3_desc *desc = &ring->desc[ring->next_to_use];
        struct device *dev = ring_to_dev(ring);
-       u32 ol_type_vlan_len_msec = 0;
        u16 bdtp_fe_sc_vld_ra_ri = 0;
        struct skb_frag_struct *frag;
        unsigned int frag_buf_num;
-       u32 type_cs_vlan_tso = 0;
-       struct sk_buff *skb;
-       u16 inner_vtag = 0;
-       u16 out_vtag = 0;
-       unsigned int k;
-       int sizeoflast;
-       u32 paylen = 0;
+       int k, sizeoflast;
        dma_addr_t dma;
-       u16 mss = 0;
-       u8 ol4_proto;
-       u8 il4_proto;
-       int ret;
 
        if (type == DESC_TYPE_SKB) {
-               skb = (struct sk_buff *)priv;
-               paylen = skb->len;
+               struct sk_buff *skb = (struct sk_buff *)priv;
+               u32 ol_type_vlan_len_msec = 0;
+               u32 type_cs_vlan_tso = 0;
+               u32 paylen = skb->len;
+               u16 inner_vtag = 0;
+               u16 out_vtag = 0;
+               u16 mss = 0;
+               int ret;
 
                ret = hns3_fill_desc_vtags(skb, ring, &type_cs_vlan_tso,
                                           &ol_type_vlan_len_msec,
@@ -1057,6 +1052,8 @@ static int hns3_fill_desc(struct hns3_enet_ring *ring, void *priv,
                        return ret;
 
                if (skb->ip_summed == CHECKSUM_PARTIAL) {
+                       u8 ol4_proto, il4_proto;
+
                        skb_reset_mac_len(skb);
 
                        ret = hns3_get_l4_protocol(skb, &ol4_proto, &il4_proto);
@@ -2353,11 +2350,6 @@ static void hns3_rx_checksum(struct hns3_enet_ring *ring, struct sk_buff *skb,
                return;
        }
 
-       l3_type = hnae3_get_field(l234info, HNS3_RXD_L3ID_M,
-                                 HNS3_RXD_L3ID_S);
-       l4_type = hnae3_get_field(l234info, HNS3_RXD_L4ID_M,
-                                 HNS3_RXD_L4ID_S);
-
        ol4_type = hnae3_get_field(l234info, HNS3_RXD_OL4ID_M,
                                   HNS3_RXD_OL4ID_S);
        switch (ol4_type) {
@@ -2366,6 +2358,11 @@ static void hns3_rx_checksum(struct hns3_enet_ring *ring, struct sk_buff *skb,
                skb->csum_level = 1;
                /* fall through */
        case HNS3_OL4_TYPE_NO_TUN:
+               l3_type = hnae3_get_field(l234info, HNS3_RXD_L3ID_M,
+                                         HNS3_RXD_L3ID_S);
+               l4_type = hnae3_get_field(l234info, HNS3_RXD_L4ID_M,
+                                         HNS3_RXD_L4ID_S);
+
                /* Can checksum ipv4 or ipv6 + UDP/TCP/SCTP packets */
                if ((l3_type == HNS3_L3_TYPE_IPV4 ||
                     l3_type == HNS3_L3_TYPE_IPV6) &&