Re: [RFC][PATCH v4 01/18] Add a new struct for device to manipulate external buffer.

[Andy Fleming <afleming@gmail.com>]

On Sun, Apr 25, 2010 at 4:19 AM,  <xiaohui.xin@intel.com> wrote:
> From: Xin Xiaohui <xiaohui.xin@intel.com>
>
> Signed-off-by: Xin Xiaohui <xiaohui.xin@intel.com>
> Signed-off-by: Zhao Yu <yzhao81@gmail.com>
> Reviewed-by: Jeff Dike <jdike@linux.intel.com>
> ---
>  include/linux/netdevice.h |   19 ++++++++++++++++++-
>  1 files changed, 18 insertions(+), 1 deletions(-)
>
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index c79a88b..bf79756 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -530,6 +530,22 @@ struct netdev_queue {
>        unsigned long           tx_dropped;
>  } ____cacheline_aligned_in_smp;
>
> +/* Add a structure in structure net_device, the new field is
> + * named as mp_port. It's for mediate passthru (zero-copy).
> + * It contains the capability for the net device driver,
> + * a socket, and an external buffer creator, external means
> + * skb buffer belongs to the device may not be allocated from
> + * kernel space.
> + */
> +struct mpassthru_port  {
> +       int             hdr_len;
> +       int             data_len;
> +       int             npages;
> +       unsigned        flags;
> +       struct socket   *sock;
> +       struct skb_external_page *(*ctor)(struct mpassthru_port *,
> +                               struct sk_buff *, int);
> +};


I tried searching around, but couldn't find where struct
skb_external_page is declared.  Where is it?

Andy