On Fri, 6 May 2022 11:12:58 -0700 Ricardo Martinez wrote:
> Helper to calculate the linear data space in the skb.
>
> Signed-off-by: Ricardo Martinez <ricardo.martinez@xxxxxxxxxxxxxxx>
> Reviewed-by: Sergey Ryazanov <ryazanov.s.a@xxxxxxxxx>
> ---
> include/linux/skbuff.h | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
> index 5c2599e3fe7d..d58669d6cb91 100644
> --- a/include/linux/skbuff.h
> +++ b/include/linux/skbuff.h
> @@ -1665,6 +1665,11 @@ static inline void skb_set_end_offset(struct sk_buff *skb, unsigned int offset)
> }
> #endif
>
> +static inline unsigned int skb_data_area_size(struct sk_buff *skb)
> +{
> + return skb_end_pointer(skb) - skb->data;
> +}
Not a great name, skb->data_len is the length of paged data.
There is no such thing as "data area", data is just a pointer
somewhere into skb->head.
Why do you need this? Why can't you use the size you passed
to the dev_alloc_skb() like everyone else?
