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    Subject[RFC][PATCH v5 01/19] Add a new structure for skb buffer from external.
    Date
    From: Xin Xiaohui <xiaohui.xin@intel.com>

    Signed-off-by: Xin Xiaohui <xiaohui.xin@intel.com>
    Signed-off-by: Zhao Yu <yzhao81new@gmail.com>
    Reviewed-by: Jeff Dike <jdike@linux.intel.com>
    ---
    include/linux/skbuff.h | 12 ++++++++++++
    1 files changed, 12 insertions(+), 0 deletions(-)

    diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
    index 124f90c..cf309c9 100644
    --- a/include/linux/skbuff.h
    +++ b/include/linux/skbuff.h
    @@ -203,6 +203,18 @@ struct skb_shared_info {
    void * destructor_arg;
    };

    +/* The structure is for a skb which skb->data may point to
    + * an external buffer, which is not allocated from kernel space.
    + * Since the buffer is external, then the shinfo or frags are
    + * also extern too. It also contains a destructor for itself.
    + */
    +struct skb_external_page {
    + u8 *start;
    + int size;
    + struct skb_frag_struct *frags;
    + struct skb_shared_info *ushinfo;
    + void (*dtor)(struct skb_external_page *);
    +};
    /* We divide dataref into two halves. The higher 16 bits hold references
    * to the payload part of skb->data. The lower 16 bits hold references to
    * the entire skb->data. A clone of a headerless skb holds the length of
    --
    1.5.4.4


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