udp: Do not pass MSS as parameter to GSO segmentation

There is no point in passing MSS as a parameter for for the GSO
segmentation call as it is already available via the shared info for the
skb itself.

Reviewed-by: Eric Dumazet <edumazet@google.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/udp.h

@@ -176,7 +176,7 @@ int udp_gro_complete(struct sk_buff *skb, int nhoff, udp_lookup_t lookup);
 
 struct sk_buff *__udp_gso_segment(struct sk_buff *gso_skb,
 				  netdev_features_t features,
-				  unsigned int mss, __sum16 check);
+				  __sum16 check);
 
 static inline struct udphdr *udp_gro_udphdr(struct sk_buff *skb)
 {

net/ipv4/udp_offload.c

@@ -189,14 +189,16 @@ EXPORT_SYMBOL(skb_udp_tunnel_segment);
 
 struct sk_buff *__udp_gso_segment(struct sk_buff *gso_skb,
 				  netdev_features_t features,
-				  unsigned int mss, __sum16 check)
+				  __sum16 check)
 {
 	struct sock *sk = gso_skb->sk;
 	unsigned int sum_truesize = 0;
 	struct sk_buff *segs, *seg;
 	unsigned int hdrlen;
 	struct udphdr *uh;
+	unsigned int mss;
 
+	mss = skb_shinfo(gso_skb)->gso_size;
 	if (gso_skb->len <= sizeof(*uh) + mss)
 		return ERR_PTR(-EINVAL);
 
@@ -244,7 +246,7 @@ static struct sk_buff *__udp4_gso_segment(struct sk_buff *gso_skb,
 	if (!can_checksum_protocol(features, htons(ETH_P_IP)))
 		return ERR_PTR(-EIO);
 
-	return __udp_gso_segment(gso_skb, features, mss,
+	return __udp_gso_segment(gso_skb, features,
 				 udp_v4_check(sizeof(struct udphdr) + mss,
 					      iph->saddr, iph->daddr, 0));
 }

net/ipv6/udp_offload.c

@@ -26,7 +26,7 @@ static struct sk_buff *__udp6_gso_segment(struct sk_buff *gso_skb,
 	if (!can_checksum_protocol(features, htons(ETH_P_IPV6)))
 		return ERR_PTR(-EIO);
 
-	return __udp_gso_segment(gso_skb, features, mss,
+	return __udp_gso_segment(gso_skb, features,
 				 udp_v6_check(sizeof(struct udphdr) + mss,
 					      &ip6h->saddr, &ip6h->daddr, 0));
 }