Use ETH_HLEN instead and introduce two new macros: GENEVE_IPV4_HLEN and GENEVE_IPV6_HLEN that include Ethernet header length, corresponded IP header length and GENEVE_BASE_HLEN.
Signed-off-by: Alexey Kodanev <[email protected]> --- drivers/net/geneve.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c index 45acdc9..b650f84 100644 --- a/drivers/net/geneve.c +++ b/drivers/net/geneve.c @@ -36,6 +36,8 @@ #define GENEVE_VER 0 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr)) +#define GENEVE_IPV4_HLEN (ETH_HLEN + sizeof(struct iphdr) + GENEVE_BASE_HLEN) +#define GENEVE_IPV6_HLEN (ETH_HLEN + sizeof(struct ipv6hdr) + GENEVE_BASE_HLEN) /* per-network namespace private data for this module */ struct geneve_net { @@ -826,8 +828,8 @@ static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev, return PTR_ERR(rt); if (skb_dst(skb)) { - int mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr) - - GENEVE_BASE_HLEN - info->options_len - 14; + int mtu = dst_mtu(&rt->dst) - GENEVE_IPV4_HLEN - + info->options_len; skb_dst_update_pmtu(skb, mtu); } @@ -872,8 +874,7 @@ static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, return PTR_ERR(dst); if (skb_dst(skb)) { - int mtu = dst_mtu(dst) - sizeof(struct ipv6hdr) - - GENEVE_BASE_HLEN - info->options_len - 14; + int mtu = dst_mtu(dst) - GENEVE_IPV6_HLEN - info->options_len; skb_dst_update_pmtu(skb, mtu); } -- 1.8.3.1
