From patchwork Fri May 7 09:34:48 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Xin, Xiaohui" X-Patchwork-Id: 97705 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 o479ZESD014825 for ; Fri, 7 May 2010 09:39:31 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755544Ab0EGJfr (ORCPT ); Fri, 7 May 2010 05:35:47 -0400 Received: from mga09.intel.com ([134.134.136.24]:55769 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755218Ab0EGJ3v (ORCPT ); Fri, 7 May 2010 05:29:51 -0400 Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga102.jf.intel.com with ESMTP; 07 May 2010 02:28:23 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.52,347,1270450800"; d="scan'208";a="515914984" Received: from unknown (HELO localhost.localdomain) ([10.239.36.200]) by orsmga002.jf.intel.com with ESMTP; 07 May 2010 02:29:19 -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, jdike@linux.intel.com Cc: Xin Xiaohui Subject: [RFC][PATCH v5 01/19] Add a new structure for skb buffer from external. Date: Fri, 7 May 2010 17:34:48 +0800 Message-Id: <1273224906-4874-2-git-send-email-xiaohui.xin@intel.com> X-Mailer: git-send-email 1.5.4.4 In-Reply-To: <1273224906-4874-1-git-send-email-xiaohui.xin@intel.com> References: <1273224906-4874-1-git-send-email-xiaohui.xin@intel.com> 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]); Fri, 07 May 2010 09:39:31 +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