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net: hns: bug fix about the overflow of mss 

When set MTU to the minimum value 68, there are increasing number
of error packets occur, which is caused by the overflowed value of
mss. This patch fix the bug.

Signed-off-by: Daode Huang <huangdaode@hisilicon.com>
Signed-off-by: Yisen Zhuang <Yisen.Zhuang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daode Huang 2016-03-22 16:06:31 +08:00 committed by David S. Miller
parent 211b138403
commit 0b51b1dc79
1 changed files with 8 additions and 9 deletions
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17
drivers/net/ethernet/hisilicon/hns/hns_enet.c
View File

@ -48,7 +48,6 @@ static void fill_v2_desc(struct hnae_ring *ring, void *priv,
struct iphdr *iphdr;
struct ipv6hdr *ipv6hdr;
struct sk_buff *skb;
int skb_tmp_len;
__be16 protocol;
u8 bn_pid = 0;
u8 rrcfv = 0;
@ -94,13 +93,13 @@ static void fill_v2_desc(struct hnae_ring *ring, void *priv,
hnae_set_bit(rrcfv, HNSV2_TXD_L4CS_B, 1);
/* check for tcp/udp header */
if (iphdr->protocol == IPPROTO_TCP) {
if (iphdr->protocol == IPPROTO_TCP &&
skb_is_gso(skb)) {
hnae_set_bit(tvsvsn,
HNSV2_TXD_TSE_B, 1);
skb_tmp_len = SKB_TMP_LEN(skb);
l4_len = tcp_hdrlen(skb);
mss = mtu - skb_tmp_len - ETH_FCS_LEN;
paylen = skb->len - skb_tmp_len;
mss = skb_shinfo(skb)->gso_size;
paylen = skb->len - SKB_TMP_LEN(skb);
}
} else if (skb->protocol == htons(ETH_P_IPV6)) {
hnae_set_bit(tvsvsn, HNSV2_TXD_IPV6_B, 1);
@ -108,13 +107,13 @@ static void fill_v2_desc(struct hnae_ring *ring, void *priv,
hnae_set_bit(rrcfv, HNSV2_TXD_L4CS_B, 1);
/* check for tcp/udp header */
if (ipv6hdr->nexthdr == IPPROTO_TCP) {
if (ipv6hdr->nexthdr == IPPROTO_TCP &&
skb_is_gso(skb) && skb_is_gso_v6(skb)) {
hnae_set_bit(tvsvsn,
HNSV2_TXD_TSE_B, 1);
skb_tmp_len = SKB_TMP_LEN(skb);
l4_len = tcp_hdrlen(skb);
mss = mtu - skb_tmp_len - ETH_FCS_LEN;
paylen = skb->len - skb_tmp_len;
mss = skb_shinfo(skb)->gso_size;
paylen = skb->len - SKB_TMP_LEN(skb);
}
}
desc->tx.ip_offset = ip_offset;