net: add and use skb_gso_transport_seglen()

This moves part of Eric Dumazets skb_gso_seglen helper from tbf sched to
skbuff core so it may be reused by upcoming ip forwarding path patch.

Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 10 deletions

diff --git a/net/sched/sch_tbf.c b/net/sched/sch_tbf.c
index fbba5b0ec121..1cb413fead89 100644
--- a/net/sched/sch_tbf.c
+++ b/net/sched/sch_tbf.c
@@ -21,7 +21,6 @@
 #include <net/netlink.h>
 #include <net/sch_generic.h>
 #include <net/pkt_sched.h>
-#include <net/tcp.h>
 
 
 /*      Simple Token Bucket Filter.
@@ -148,16 +147,10 @@ static u64 psched_ns_t2l(const struct psched_ratecfg *r,
  * Return length of individual segments of a gso packet,
  * including all headers (MAC, IP, TCP/UDP)
  */
-static unsigned int skb_gso_seglen(const struct sk_buff *skb)
+static unsigned int skb_gso_mac_seglen(const struct sk_buff *skb)
 {
         unsigned int hdr_len = skb_transport_header(skb) - skb_mac_header(skb);
-        const struct skb_shared_info *shinfo = skb_shinfo(skb);
-
-        if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6)))
-                hdr_len += tcp_hdrlen(skb);
-        else
-                hdr_len += sizeof(struct udphdr);
-        return hdr_len + shinfo->gso_size;
+        return hdr_len + skb_gso_transport_seglen(skb);
 }
 
 /* GSO packet is too big, segment it so that tbf can transmit
@@ -202,7 +195,7 @@ static int tbf_enqueue(struct sk_buff *skb, struct Qdisc *sch)
         int ret;
 
         if (qdisc_pkt_len(skb) > q->max_size) {
-                if (skb_is_gso(skb) && skb_gso_seglen(skb) <= q->max_size)
+                if (skb_is_gso(skb) && skb_gso_mac_seglen(skb) <= q->max_size)
                         return tbf_segment(skb, sch);
                 return qdisc_reshape_fail(skb, sch);
         }