From patchwork Sun Apr 25 09:19:48 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Xin, Xiaohui" X-Patchwork-Id: 94897 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 o3P9HQ4O029525 for ; Sun, 25 Apr 2010 09:17:26 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751804Ab0DYJQw (ORCPT ); Sun, 25 Apr 2010 05:16:52 -0400 Received: from mga01.intel.com ([192.55.52.88]:24216 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751344Ab0DYJQv (ORCPT ); Sun, 25 Apr 2010 05:16:51 -0400 Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga101.fm.intel.com with ESMTP; 25 Apr 2010 02:15:17 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.52,269,1270450800"; d="scan'208";a="561295794" Received: from unknown (HELO localhost.localdomain) ([10.239.36.200]) by fmsmga002.fm.intel.com with ESMTP; 25 Apr 2010 02:16:22 -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 v4 01/18] Add a new struct for device to manipulate external buffer. Date: Sun, 25 Apr 2010 17:19:48 +0800 Message-Id: <1272187206-18534-1-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]); Sun, 25 Apr 2010 09:17:27 +0000 (UTC) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index c79a88b..bf79756 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -530,6 +530,22 @@ 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; + struct skb_external_page *(*ctor)(struct mpassthru_port *, + struct sk_buff *, int); +}; /* * This structure defines the management hooks for network devices. @@ -952,7 +968,8 @@ 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 */