From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754466Ab0JOIw4 (ORCPT ); Fri, 15 Oct 2010 04:52:56 -0400 Received: from mga01.intel.com ([192.55.52.88]:56852 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753035Ab0JOIwx (ORCPT ); Fri, 15 Oct 2010 04:52:53 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.57,335,1283756400"; d="scan'208";a="616995370" 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: [PATCH v13 02/16] Add a new struct for device to manipulate external buffer. Date: Fri, 15 Oct 2010 17:12:03 +0800 Message-Id: <38fbf05a450b34e939aa1b0f3a5126711990f0cc.1287132437.git.xiaohui.xin@intel.com> X-Mailer: git-send-email 1.7.3 In-Reply-To: <1287133937-5538-1-git-send-email-xiaohui.xin@intel.com> References: <1287133937-5538-1-git-send-email-xiaohui.xin@intel.com> In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@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 */ -- 1.7.3