From patchwork Thu Jul 29 11:14:34 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Xin, Xiaohui" X-Patchwork-Id: 115101 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter.kernel.org (8.14.4/8.14.3) with ESMTP id o6TB5Qqa015243 for ; Thu, 29 Jul 2010 11:06:04 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756912Ab0G2LB2 (ORCPT ); Thu, 29 Jul 2010 07:01:28 -0400 Received: from mga11.intel.com ([192.55.52.93]:58755 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752211Ab0G2LBS (ORCPT ); Thu, 29 Jul 2010 07:01:18 -0400 Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP; 29 Jul 2010 03:59:11 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.55,279,1278313200"; d="scan'208";a="590877497" Received: from unknown (HELO localhost.localdomain) ([10.239.36.142]) by fmsmga002.fm.intel.com with ESMTP; 29 Jul 2010 04:00:28 -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 v8 02/16] Add a new struct for device to manipulate external buffer. Date: Thu, 29 Jul 2010 19:14:34 +0800 Message-Id: <1280402088-5849-3-git-send-email-xiaohui.xin@intel.com> X-Mailer: git-send-email 1.5.4.4 In-Reply-To: <1280402088-5849-2-git-send-email-xiaohui.xin@intel.com> References: <1280402088-5849-1-git-send-email-xiaohui.xin@intel.com> <1280402088-5849-2-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]); Thu, 29 Jul 2010 11:06:04 +0000 (UTC) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index fa8b476..ba582e1 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -530,6 +530,25 @@ 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; + int vnet_hlen; + struct skb_ext_page *(*ctor)(struct mpassthru_port *, + struct sk_buff *, int); + struct skb_ext_page *(*hash)(struct net_device *, + struct page *); +}; /* * This structure defines the management hooks for network devices. @@ -952,7 +971,8 @@ struct net_device { struct macvlan_port *macvlan_port; /* GARP */ struct garp_port *garp_port; - + /* mpassthru */ + struct mpassthru_port *mp_port; /* class/net/name entry */ struct device dev; /* space for optional device, statistics, and wireless sysfs groups */