From patchwork Tue Nov 9 09:03:07 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Xin, Xiaohui" X-Patchwork-Id: 70511 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id C4A9AB7125 for ; Tue, 9 Nov 2010 19:45:58 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754028Ab0KIIle (ORCPT ); Tue, 9 Nov 2010 03:41:34 -0500 Received: from mga01.intel.com ([192.55.52.88]:25013 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753973Ab0KIIla (ORCPT ); Tue, 9 Nov 2010 03:41:30 -0500 Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga101.fm.intel.com with ESMTP; 09 Nov 2010 00:41:29 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.59,174,1288594800"; d="scan'208";a="624917693" Received: from unknown (HELO localhost.localdomain.sh.intel.com) ([10.239.36.134]) by fmsmga002.fm.intel.com with ESMTP; 09 Nov 2010 00:41:28 -0800 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.apana.org.au, jdike@linux.intel.com Cc: Xin Xiaohui Subject: [PATCH v15 02/17]Add a new struct for device to manipulate external buffer. Date: Tue, 9 Nov 2010 17:03:07 +0800 Message-Id: <38fbf05a450b34e939aa1b0f3a5126711990f0cc.1289280885.git.xiaohui.xin@intel.com> X-Mailer: git-send-email 1.7.3 In-Reply-To: <1289293402-4791-1-git-send-email-xiaohui.xin@intel.com> References: <1289293402-4791-1-git-send-email-xiaohui.xin@intel.com> In-Reply-To: References: Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Xin Xiaohui 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. Signed-off-by: Xin Xiaohui Signed-off-by: Zhao Yu Reviewed-by: Jeff Dike --- include/linux/netdevice.h | 25 ++++++++++++++++++++++++- 1 files changed, 24 insertions(+), 1 deletions(-) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 46c36ff..f6b1870 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -325,6 +325,28 @@ enum netdev_state_t { __LINK_STATE_DORMANT, }; +/*The structure for mediate passthru(zero-copy). */ +struct mp_port { + /* the header len */ + int hdr_len; + /* the max payload len for one descriptor */ + int data_len; + /* the pages for DMA in one time */ + int npages; + /* the socket bind to */ + struct socket *sock; + /* the header len for virtio-net */ + int vnet_hlen; + /* the external buffer page creator */ + struct skb_ext_page *(*ctor)(struct mp_port *, + struct sk_buff *, int); + /* the hash function attached to find according + * backend ring descriptor info for one external + * buffer page. + */ + struct skb_ext_page *(*hash)(struct net_device *, + struct page *); +}; /* * This structure holds at boot time configured netdevice settings. They @@ -1045,7 +1067,8 @@ struct net_device { /* GARP */ struct garp_port *garp_port; - + /* mpassthru */ + struct mp_port *mp_port; /* class/net/name entry */ struct device dev; /* space for optional device, statistics, and wireless sysfs groups */