From mboxrd@z Thu Jan 1 00:00:00 1970 From: xiaohui.xin@intel.com Subject: [RFC PATCH v7 01/19] Add a new structure for skb buffer from external. Date: Sat, 5 Jun 2010 18:14:40 +0800 Message-ID: <1275732899-5423-1-git-send-email-xiaohui.xin@intel.com> Cc: Xin Xiaohui To: netdev@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, mst@redhat.com, mingo@elte.hu, davem@davemloft.net, herbert@gondor.apana.org.au, jdike@linux.intel.com Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org From: Xin Xiaohui Signed-off-by: Xin Xiaohui Signed-off-by: Zhao Yu Reviewed-by: Jeff Dike --- 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