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tcp: __tcp_hdrlen() helper

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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>
This commit is contained in:
Craig Gallek 2016-02-10 11:50:37 -05:00 committed by Greg Kroah-Hartman
parent 6c489ab43c
commit bed42ef5eb
1 changed files with 6 additions and 1 deletions
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7
include/linux/tcp.h
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@ -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)