On Wed, 2013-06-12 at 22:40 +1000, Dave Wiltshire wrote:
> In a few different drivers there is a check of (skb_cloned &&
> !skb_clone_writable) before then using pskb_expand_head to copy the skb
> if that is required. There are already some skb_cow_* functions for
> other conditions, so added this one and changed the call sites.
>
> Signed-off-by: Dave Wiltshire <david.wiltshire@xxxxxxx>
> ---
> include/linux/skbuff.h | 14 ++++++++++++++
> net/core/dev.c | 8 ++------
> net/openvswitch/actions.c | 22 +++++++---------------
> net/sched/act_csum.c | 8 ++------
> net/sched/act_nat.c | 18 +++++-------------
> 5 files changed, 30 insertions(+), 40 deletions(-)
>
> diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
> index a7393ad..7d18541 100644
> --- a/include/linux/skbuff.h
> +++ b/include/linux/skbuff.h
> @@ -2154,6 +2154,20 @@ static inline int skb_cow_head(struct sk_buff *skb, unsigned int headroom)
> }
>
> /**
> + * skb_cow_clone_head
This is a missing a short description after the name.
Ben.
> + * @skb: buffer to cow
> + * @len: length up to which to write
> + *
> + * This function is identical to skb_cow and sb_cow_head except that we
> + * replace the skb_cloned check by skb_cloned && !skb_clone_writable.
> + *
> + */
> +static inline int skb_cow_clone_head(struct sk_buff *skb, unsigned int len)
> +{
> + return __skb_cow(skb, 0, skb_cloned(skb) && !skb_clone_writable(skb, len));
> +}
[...]
--
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.
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