Commit eaf3179d authored Feb 10, 2016 by Craig Gallek Committed by Greg Kroah-Hartman Jan 31, 2018

tcp: __tcp_hdrlen() helper



commit d9b3fca27385eafe61c3ca6feab6cb1e7dc77482 upstream.

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>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 483217b8

include/linux/tcp.h

+6 −1

Original line number	Diff line number	Diff line
		@@ -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)