From patchwork Sat Jun 5 10:14:40 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Xin, Xiaohui" X-Patchwork-Id: 104426 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter.kernel.org (8.14.3/8.14.3) with ESMTP id o55ADqnt004534 for ; Sat, 5 Jun 2010 10:13:52 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932738Ab0FEKGy (ORCPT ); Sat, 5 Jun 2010 06:06:54 -0400 Received: from mga01.intel.com ([192.55.52.88]:64909 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932711Ab0FEKGx (ORCPT ); Sat, 5 Jun 2010 06:06:53 -0400 Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga101.fm.intel.com with ESMTP; 05 Jun 2010 03:02:50 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.53,366,1272870000"; d="scan'208";a="804988009" Received: from unknown (HELO localhost.localdomain) ([10.239.36.142]) by fmsmga001.fm.intel.com with ESMTP; 05 Jun 2010 03:06:32 -0700 From: xiaohui.xin@intel.com 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.hengli.com.au, jdike@linux.intel.com Cc: Xin Xiaohui 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> X-Mailer: git-send-email 1.5.4.4 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter.kernel.org [140.211.167.41]); Sat, 05 Jun 2010 10:13:52 +0000 (UTC) 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