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[net-next,v3,3/7] tcp: __tcp_hdrlen() helper

Message ID 1455063542-18227-4-git-send-email-kraigatgoog@gmail.com
State Changes Requested, archived
Delegated to: David Miller
Headers show

Commit Message

Craig Gallek Feb. 10, 2016, 12:18 a.m. UTC 
From: Craig Gallek <kraig@google.com>

tcp_hdrlen is wasteful if you already have a pointer to struct tcphdr.
This splits the size calculation into a helper function that can be
used if a struct tcphdr is already available.

Signed-off-by: Craig Gallek <kraig@google.com>
---
 include/linux/tcp.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
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Patch

diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index b386361ba3e8..c216707d63bf 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -29,9 +29,14 @@  static inline struct tcphdr *tcp_hdr(const struct sk_buff *skb)
 	return (struct tcphdr *)skb_transport_header(skb);
 }
 
+static inline unsigned int __tcp_hdrlen(const struct tcphdr *th)
+{
+	return th->doff * 4;
+}
+
 static inline unsigned int tcp_hdrlen(const struct sk_buff *skb)
 {
-	return tcp_hdr(skb)->doff * 4;
+	return __tcp_hdrlen(tcp_hdr(skb));
 }
 
 static inline struct tcphdr *inner_tcp_hdr(const struct sk_buff *skb)