From patchwork Sat Jun 5 10:14:46 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Xin, Xiaohui" X-Patchwork-Id: 104412 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 o55ABxFn004184 for ; Sat, 5 Jun 2010 10:11:59 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932859Ab0FEKHF (ORCPT ); Sat, 5 Jun 2010 06:07:05 -0400 Received: from mga01.intel.com ([192.55.52.88]:65455 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932846Ab0FEKHD (ORCPT ); Sat, 5 Jun 2010 06:07:03 -0400 Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga101.fm.intel.com with ESMTP; 05 Jun 2010 03:02:59 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.53,366,1272870000"; d="scan'208";a="804988043" Received: from unknown (HELO localhost.localdomain) ([10.239.36.142]) by fmsmga001.fm.intel.com with ESMTP; 05 Jun 2010 03:06:42 -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 v7 07/19] Add interface to get external buffers. Date: Sat, 5 Jun 2010 18:14:46 +0800 Message-Id: <1275732899-5423-7-git-send-email-xiaohui.xin@intel.com> X-Mailer: git-send-email 1.5.4.4 In-Reply-To: <1275732899-5423-6-git-send-email-xiaohui.xin@intel.com> References: <1275732899-5423-1-git-send-email-xiaohui.xin@intel.com> <1275732899-5423-2-git-send-email-xiaohui.xin@intel.com> <1275732899-5423-3-git-send-email-xiaohui.xin@intel.com> <1275732899-5423-4-git-send-email-xiaohui.xin@intel.com> <1275732899-5423-5-git-send-email-xiaohui.xin@intel.com> <1275732899-5423-6-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]); Sat, 05 Jun 2010 10:11:59 +0000 (UTC) diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index cf309c9..281a1c0 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -1519,6 +1519,18 @@ static inline void netdev_free_page(struct net_device *dev, struct page *page) __free_page(page); } +extern struct skb_external_page *netdev_alloc_external_pages( + struct net_device *dev, + struct sk_buff *skb, int npages); + +static inline struct skb_external_page *netdev_alloc_external_page( + struct net_device *dev, + struct sk_buff *skb, unsigned int size) +{ + return netdev_alloc_external_pages(dev, skb, + DIV_ROUND_UP(size, PAGE_SIZE)); +} + /** * skb_clone_writable - is the header of a clone writable * @skb: buffer to check diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 93c4e06..fbdb1f1 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -278,6 +278,22 @@ struct page *__netdev_alloc_page(struct net_device *dev, gfp_t gfp_mask) } EXPORT_SYMBOL(__netdev_alloc_page); +struct skb_external_page *netdev_alloc_external_pages(struct net_device *dev, + struct sk_buff *skb, int npages) +{ + struct mpassthru_port *port; + struct skb_external_page *ext_page = NULL; + + port = rcu_dereference(dev->mp_port); + if (!port) + goto out; + WARN_ON(npages > port->npages); + ext_page = port->ctor(port, skb, npages); +out: + return ext_page; +} +EXPORT_SYMBOL(netdev_alloc_external_pages); + void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, int off, int size) {